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2204 lines
65 KiB
2204 lines
65 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 1996 John Shifflett, GeoLog Consulting |
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* [email protected] |
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* [email protected] |
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*/ |
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|
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/* |
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* Drew Eckhardt's excellent 'Generic NCR5380' sources from Linux-PC |
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* provided much of the inspiration and some of the code for this |
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* driver. Everything I know about Amiga DMA was gleaned from careful |
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* reading of Hamish Mcdonald's original wd33c93 driver; in fact, I |
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* borrowed shamelessly from all over that source. Thanks Hamish! |
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* |
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* _This_ driver is (I feel) an improvement over the old one in |
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* several respects: |
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* |
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* - Target Disconnection/Reconnection is now supported. Any |
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* system with more than one device active on the SCSI bus |
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* will benefit from this. The driver defaults to what I |
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* call 'adaptive disconnect' - meaning that each command |
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* is evaluated individually as to whether or not it should |
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* be run with the option to disconnect/reselect (if the |
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* device chooses), or as a "SCSI-bus-hog". |
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* |
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* - Synchronous data transfers are now supported. Because of |
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* a few devices that choke after telling the driver that |
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* they can do sync transfers, we don't automatically use |
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* this faster protocol - it can be enabled via the command- |
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* line on a device-by-device basis. |
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* |
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* - Runtime operating parameters can now be specified through |
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* the 'amiboot' or the 'insmod' command line. For amiboot do: |
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* "amiboot [usual stuff] wd33c93=blah,blah,blah" |
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* The defaults should be good for most people. See the comment |
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* for 'setup_strings' below for more details. |
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* |
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* - The old driver relied exclusively on what the Western Digital |
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* docs call "Combination Level 2 Commands", which are a great |
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* idea in that the CPU is relieved of a lot of interrupt |
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* overhead. However, by accepting a certain (user-settable) |
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* amount of additional interrupts, this driver achieves |
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* better control over the SCSI bus, and data transfers are |
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* almost as fast while being much easier to define, track, |
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* and debug. |
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* |
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* |
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* TODO: |
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* more speed. linked commands. |
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* |
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* |
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* People with bug reports, wish-lists, complaints, comments, |
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* or improvements are asked to pah-leeez email me (John Shifflett) |
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* at [email protected] or [email protected]! I'm anxious to get |
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* this thing into as good a shape as possible, and I'm positive |
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* there are lots of lurking bugs and "Stupid Places". |
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* |
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* Updates: |
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* |
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* Added support for pre -A chips, which don't have advanced features |
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* and will generate CSR_RESEL rather than CSR_RESEL_AM. |
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* Richard Hirst <[email protected]> August 2000 |
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* |
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* Added support for Burst Mode DMA and Fast SCSI. Enabled the use of |
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* default_sx_per for asynchronous data transfers. Added adjustment |
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* of transfer periods in sx_table to the actual input-clock. |
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* peter fuerst <[email protected]> February 2007 |
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*/ |
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#include <linux/module.h> |
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#include <linux/string.h> |
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#include <linux/delay.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/blkdev.h> |
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#include <scsi/scsi.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_host.h> |
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#include <asm/irq.h> |
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#include "wd33c93.h" |
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#define optimum_sx_per(hostdata) (hostdata)->sx_table[1].period_ns |
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#define WD33C93_VERSION "1.26++" |
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#define WD33C93_DATE "10/Feb/2007" |
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MODULE_AUTHOR("John Shifflett"); |
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MODULE_DESCRIPTION("Generic WD33C93 SCSI driver"); |
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MODULE_LICENSE("GPL"); |
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|
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/* |
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* 'setup_strings' is a single string used to pass operating parameters and |
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* settings from the kernel/module command-line to the driver. 'setup_args[]' |
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* is an array of strings that define the compile-time default values for |
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* these settings. If Linux boots with an amiboot or insmod command-line, |
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* those settings are combined with 'setup_args[]'. Note that amiboot |
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* command-lines are prefixed with "wd33c93=" while insmod uses a |
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* "setup_strings=" prefix. The driver recognizes the following keywords |
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* (lower case required) and arguments: |
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* |
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* - nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with |
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* the 7 possible SCSI devices. Set a bit to negotiate for |
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* asynchronous transfers on that device. To maintain |
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* backwards compatibility, a command-line such as |
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* "wd33c93=255" will be automatically translated to |
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* "wd33c93=nosync:0xff". |
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* - nodma:x -x = 1 to disable DMA, x = 0 to enable it. Argument is |
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* optional - if not present, same as "nodma:1". |
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* - period:ns -ns is the minimum # of nanoseconds in a SCSI data transfer |
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* period. Default is 500; acceptable values are 250 - 1000. |
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* - disconnect:x -x = 0 to never allow disconnects, 2 to always allow them. |
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* x = 1 does 'adaptive' disconnects, which is the default |
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* and generally the best choice. |
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* - debug:x -If 'DEBUGGING_ON' is defined, x is a bit mask that causes |
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* various types of debug output to printed - see the DB_xxx |
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* defines in wd33c93.h |
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* - clock:x -x = clock input in MHz for WD33c93 chip. Normal values |
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* would be from 8 through 20. Default is 8. |
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* - burst:x -x = 1 to use Burst Mode (or Demand-Mode) DMA, x = 0 to use |
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* Single Byte DMA, which is the default. Argument is |
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* optional - if not present, same as "burst:1". |
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* - fast:x -x = 1 to enable Fast SCSI, which is only effective with |
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* input-clock divisor 4 (WD33C93_FS_16_20), x = 0 to disable |
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* it, which is the default. Argument is optional - if not |
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* present, same as "fast:1". |
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* - next -No argument. Used to separate blocks of keywords when |
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* there's more than one host adapter in the system. |
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* |
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* Syntax Notes: |
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* - Numeric arguments can be decimal or the '0x' form of hex notation. There |
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* _must_ be a colon between a keyword and its numeric argument, with no |
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* spaces. |
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* - Keywords are separated by commas, no spaces, in the standard kernel |
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* command-line manner. |
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* - A keyword in the 'nth' comma-separated command-line member will overwrite |
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* the 'nth' element of setup_args[]. A blank command-line member (in |
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* other words, a comma with no preceding keyword) will _not_ overwrite |
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* the corresponding setup_args[] element. |
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* - If a keyword is used more than once, the first one applies to the first |
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* SCSI host found, the second to the second card, etc, unless the 'next' |
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* keyword is used to change the order. |
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* |
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* Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'): |
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* - wd33c93=nosync:255 |
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* - wd33c93=nodma |
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* - wd33c93=nodma:1 |
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* - wd33c93=disconnect:2,nosync:0x08,period:250 |
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* - wd33c93=debug:0x1c |
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*/ |
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/* Normally, no defaults are specified */ |
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static char *setup_args[] = { "", "", "", "", "", "", "", "", "", "" }; |
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static char *setup_strings; |
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module_param(setup_strings, charp, 0); |
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static void wd33c93_execute(struct Scsi_Host *instance); |
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#ifdef CONFIG_WD33C93_PIO |
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static inline uchar |
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read_wd33c93(const wd33c93_regs regs, uchar reg_num) |
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{ |
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uchar data; |
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|
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outb(reg_num, regs.SASR); |
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data = inb(regs.SCMD); |
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return data; |
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} |
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static inline unsigned long |
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read_wd33c93_count(const wd33c93_regs regs) |
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{ |
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unsigned long value; |
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|
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outb(WD_TRANSFER_COUNT_MSB, regs.SASR); |
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value = inb(regs.SCMD) << 16; |
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value |= inb(regs.SCMD) << 8; |
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value |= inb(regs.SCMD); |
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return value; |
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} |
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static inline uchar |
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read_aux_stat(const wd33c93_regs regs) |
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{ |
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return inb(regs.SASR); |
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} |
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static inline void |
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write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value) |
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{ |
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outb(reg_num, regs.SASR); |
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outb(value, regs.SCMD); |
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} |
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static inline void |
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write_wd33c93_count(const wd33c93_regs regs, unsigned long value) |
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{ |
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outb(WD_TRANSFER_COUNT_MSB, regs.SASR); |
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outb((value >> 16) & 0xff, regs.SCMD); |
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outb((value >> 8) & 0xff, regs.SCMD); |
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outb( value & 0xff, regs.SCMD); |
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} |
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#define write_wd33c93_cmd(regs, cmd) \ |
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write_wd33c93((regs), WD_COMMAND, (cmd)) |
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static inline void |
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write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[]) |
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{ |
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int i; |
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outb(WD_CDB_1, regs.SASR); |
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for (i=0; i<len; i++) |
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outb(cmnd[i], regs.SCMD); |
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} |
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#else /* CONFIG_WD33C93_PIO */ |
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static inline uchar |
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read_wd33c93(const wd33c93_regs regs, uchar reg_num) |
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{ |
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*regs.SASR = reg_num; |
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mb(); |
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return (*regs.SCMD); |
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} |
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static unsigned long |
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read_wd33c93_count(const wd33c93_regs regs) |
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{ |
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unsigned long value; |
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*regs.SASR = WD_TRANSFER_COUNT_MSB; |
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mb(); |
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value = *regs.SCMD << 16; |
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value |= *regs.SCMD << 8; |
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value |= *regs.SCMD; |
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mb(); |
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return value; |
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} |
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static inline uchar |
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read_aux_stat(const wd33c93_regs regs) |
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{ |
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return *regs.SASR; |
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} |
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static inline void |
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write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value) |
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{ |
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*regs.SASR = reg_num; |
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mb(); |
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*regs.SCMD = value; |
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mb(); |
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} |
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static void |
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write_wd33c93_count(const wd33c93_regs regs, unsigned long value) |
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{ |
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*regs.SASR = WD_TRANSFER_COUNT_MSB; |
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mb(); |
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*regs.SCMD = value >> 16; |
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*regs.SCMD = value >> 8; |
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*regs.SCMD = value; |
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mb(); |
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} |
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static inline void |
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write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd) |
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{ |
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*regs.SASR = WD_COMMAND; |
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mb(); |
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*regs.SCMD = cmd; |
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mb(); |
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} |
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static inline void |
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write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[]) |
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{ |
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int i; |
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*regs.SASR = WD_CDB_1; |
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for (i = 0; i < len; i++) |
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*regs.SCMD = cmnd[i]; |
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} |
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#endif /* CONFIG_WD33C93_PIO */ |
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static inline uchar |
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read_1_byte(const wd33c93_regs regs) |
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{ |
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uchar asr; |
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uchar x = 0; |
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write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); |
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write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80); |
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do { |
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asr = read_aux_stat(regs); |
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if (asr & ASR_DBR) |
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x = read_wd33c93(regs, WD_DATA); |
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} while (!(asr & ASR_INT)); |
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return x; |
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} |
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static int |
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round_period(unsigned int period, const struct sx_period *sx_table) |
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{ |
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int x; |
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for (x = 1; sx_table[x].period_ns; x++) { |
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if ((period <= sx_table[x - 0].period_ns) && |
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(period > sx_table[x - 1].period_ns)) { |
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return x; |
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} |
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} |
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return 7; |
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} |
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/* |
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* Calculate Synchronous Transfer Register value from SDTR code. |
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*/ |
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static uchar |
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calc_sync_xfer(unsigned int period, unsigned int offset, unsigned int fast, |
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const struct sx_period *sx_table) |
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{ |
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/* When doing Fast SCSI synchronous data transfers, the corresponding |
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* value in 'sx_table' is two times the actually used transfer period. |
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*/ |
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uchar result; |
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if (offset && fast) { |
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fast = STR_FSS; |
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period *= 2; |
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} else { |
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fast = 0; |
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} |
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period *= 4; /* convert SDTR code to ns */ |
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result = sx_table[round_period(period,sx_table)].reg_value; |
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result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF; |
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result |= fast; |
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return result; |
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} |
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/* |
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* Calculate SDTR code bytes [3],[4] from period and offset. |
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*/ |
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static inline void |
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calc_sync_msg(unsigned int period, unsigned int offset, unsigned int fast, |
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uchar msg[2]) |
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{ |
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/* 'period' is a "normal"-mode value, like the ones in 'sx_table'. The |
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* actually used transfer period for Fast SCSI synchronous data |
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* transfers is half that value. |
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*/ |
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period /= 4; |
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if (offset && fast) |
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period /= 2; |
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msg[0] = period; |
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msg[1] = offset; |
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} |
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static int |
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wd33c93_queuecommand_lck(struct scsi_cmnd *cmd, |
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void (*done)(struct scsi_cmnd *)) |
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{ |
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struct WD33C93_hostdata *hostdata; |
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struct scsi_cmnd *tmp; |
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hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata; |
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DB(DB_QUEUE_COMMAND, |
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printk("Q-%d-%02x( ", cmd->device->id, cmd->cmnd[0])) |
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/* Set up a few fields in the scsi_cmnd structure for our own use: |
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* - host_scribble is the pointer to the next cmd in the input queue |
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* - scsi_done points to the routine we call when a cmd is finished |
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* - result is what you'd expect |
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*/ |
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cmd->host_scribble = NULL; |
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cmd->scsi_done = done; |
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cmd->result = 0; |
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|
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/* We use the Scsi_Pointer structure that's included with each command |
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* as a scratchpad (as it's intended to be used!). The handy thing about |
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* the SCp.xxx fields is that they're always associated with a given |
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* cmd, and are preserved across disconnect-reselect. This means we |
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* can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages |
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* if we keep all the critical pointers and counters in SCp: |
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* - SCp.ptr is the pointer into the RAM buffer |
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* - SCp.this_residual is the size of that buffer |
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* - SCp.buffer points to the current scatter-gather buffer |
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* - SCp.buffers_residual tells us how many S.G. buffers there are |
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* - SCp.have_data_in is not used |
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* - SCp.sent_command is not used |
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* - SCp.phase records this command's SRCID_ER bit setting |
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*/ |
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|
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if (scsi_bufflen(cmd)) { |
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cmd->SCp.buffer = scsi_sglist(cmd); |
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cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; |
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cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
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cmd->SCp.this_residual = cmd->SCp.buffer->length; |
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} else { |
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cmd->SCp.buffer = NULL; |
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cmd->SCp.buffers_residual = 0; |
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cmd->SCp.ptr = NULL; |
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cmd->SCp.this_residual = 0; |
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} |
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|
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/* WD docs state that at the conclusion of a "LEVEL2" command, the |
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* status byte can be retrieved from the LUN register. Apparently, |
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* this is the case only for *uninterrupted* LEVEL2 commands! If |
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* there are any unexpected phases entered, even if they are 100% |
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* legal (different devices may choose to do things differently), |
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* the LEVEL2 command sequence is exited. This often occurs prior |
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* to receiving the status byte, in which case the driver does a |
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* status phase interrupt and gets the status byte on its own. |
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* While such a command can then be "resumed" (ie restarted to |
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* finish up as a LEVEL2 command), the LUN register will NOT be |
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* a valid status byte at the command's conclusion, and we must |
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* use the byte obtained during the earlier interrupt. Here, we |
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* preset SCp.Status to an illegal value (0xff) so that when |
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* this command finally completes, we can tell where the actual |
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* status byte is stored. |
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*/ |
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|
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cmd->SCp.Status = ILLEGAL_STATUS_BYTE; |
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|
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/* |
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* Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE |
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* commands are added to the head of the queue so that the desired |
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* sense data is not lost before REQUEST_SENSE executes. |
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*/ |
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|
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spin_lock_irq(&hostdata->lock); |
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|
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if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
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cmd->host_scribble = (uchar *) hostdata->input_Q; |
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hostdata->input_Q = cmd; |
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} else { /* find the end of the queue */ |
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for (tmp = (struct scsi_cmnd *) hostdata->input_Q; |
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tmp->host_scribble; |
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tmp = (struct scsi_cmnd *) tmp->host_scribble) ; |
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tmp->host_scribble = (uchar *) cmd; |
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} |
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|
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/* We know that there's at least one command in 'input_Q' now. |
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* Go see if any of them are runnable! |
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*/ |
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|
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wd33c93_execute(cmd->device->host); |
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|
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DB(DB_QUEUE_COMMAND, printk(")Q ")) |
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|
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spin_unlock_irq(&hostdata->lock); |
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return 0; |
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} |
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|
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DEF_SCSI_QCMD(wd33c93_queuecommand) |
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|
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/* |
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* This routine attempts to start a scsi command. If the host_card is |
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* already connected, we give up immediately. Otherwise, look through |
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* the input_Q, using the first command we find that's intended |
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* for a currently non-busy target/lun. |
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* |
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* wd33c93_execute() is always called with interrupts disabled or from |
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* the wd33c93_intr itself, which means that a wd33c93 interrupt |
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* cannot occur while we are in here. |
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*/ |
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static void |
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wd33c93_execute(struct Scsi_Host *instance) |
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{ |
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struct WD33C93_hostdata *hostdata = |
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(struct WD33C93_hostdata *) instance->hostdata; |
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const wd33c93_regs regs = hostdata->regs; |
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struct scsi_cmnd *cmd, *prev; |
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|
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DB(DB_EXECUTE, printk("EX(")) |
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if (hostdata->selecting || hostdata->connected) { |
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DB(DB_EXECUTE, printk(")EX-0 ")) |
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return; |
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} |
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|
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/* |
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* Search through the input_Q for a command destined |
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* for an idle target/lun. |
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*/ |
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|
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cmd = (struct scsi_cmnd *) hostdata->input_Q; |
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prev = NULL; |
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while (cmd) { |
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if (!(hostdata->busy[cmd->device->id] & |
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(1 << (cmd->device->lun & 0xff)))) |
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break; |
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prev = cmd; |
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cmd = (struct scsi_cmnd *) cmd->host_scribble; |
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} |
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|
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/* quit if queue empty or all possible targets are busy */ |
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|
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if (!cmd) { |
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DB(DB_EXECUTE, printk(")EX-1 ")) |
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return; |
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} |
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|
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/* remove command from queue */ |
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|
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if (prev) |
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prev->host_scribble = cmd->host_scribble; |
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else |
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hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble; |
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|
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#ifdef PROC_STATISTICS |
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hostdata->cmd_cnt[cmd->device->id]++; |
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#endif |
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|
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/* |
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* Start the selection process |
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*/ |
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|
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if (cmd->sc_data_direction == DMA_TO_DEVICE) |
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write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id); |
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else |
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write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD); |
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|
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/* Now we need to figure out whether or not this command is a good |
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* candidate for disconnect/reselect. We guess to the best of our |
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* ability, based on a set of hierarchical rules. When several |
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* devices are operating simultaneously, disconnects are usually |
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* an advantage. In a single device system, or if only 1 device |
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* is being accessed, transfers usually go faster if disconnects |
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* are not allowed: |
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* |
|
* + Commands should NEVER disconnect if hostdata->disconnect = |
|
* DIS_NEVER (this holds for tape drives also), and ALWAYS |
|
* disconnect if hostdata->disconnect = DIS_ALWAYS. |
|
* + Tape drive commands should always be allowed to disconnect. |
|
* + Disconnect should be allowed if disconnected_Q isn't empty. |
|
* + Commands should NOT disconnect if input_Q is empty. |
|
* + Disconnect should be allowed if there are commands in input_Q |
|
* for a different target/lun. In this case, the other commands |
|
* should be made disconnect-able, if not already. |
|
* |
|
* I know, I know - this code would flunk me out of any |
|
* "C Programming 101" class ever offered. But it's easy |
|
* to change around and experiment with for now. |
|
*/ |
|
|
|
cmd->SCp.phase = 0; /* assume no disconnect */ |
|
if (hostdata->disconnect == DIS_NEVER) |
|
goto no; |
|
if (hostdata->disconnect == DIS_ALWAYS) |
|
goto yes; |
|
if (cmd->device->type == 1) /* tape drive? */ |
|
goto yes; |
|
if (hostdata->disconnected_Q) /* other commands disconnected? */ |
|
goto yes; |
|
if (!(hostdata->input_Q)) /* input_Q empty? */ |
|
goto no; |
|
for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev; |
|
prev = (struct scsi_cmnd *) prev->host_scribble) { |
|
if ((prev->device->id != cmd->device->id) || |
|
(prev->device->lun != cmd->device->lun)) { |
|
for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev; |
|
prev = (struct scsi_cmnd *) prev->host_scribble) |
|
prev->SCp.phase = 1; |
|
goto yes; |
|
} |
|
} |
|
|
|
goto no; |
|
|
|
yes: |
|
cmd->SCp.phase = 1; |
|
|
|
#ifdef PROC_STATISTICS |
|
hostdata->disc_allowed_cnt[cmd->device->id]++; |
|
#endif |
|
|
|
no: |
|
|
|
write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0)); |
|
|
|
write_wd33c93(regs, WD_TARGET_LUN, (u8)cmd->device->lun); |
|
write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, |
|
hostdata->sync_xfer[cmd->device->id]); |
|
hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); |
|
|
|
if ((hostdata->level2 == L2_NONE) || |
|
(hostdata->sync_stat[cmd->device->id] == SS_UNSET)) { |
|
|
|
/* |
|
* Do a 'Select-With-ATN' command. This will end with |
|
* one of the following interrupts: |
|
* CSR_RESEL_AM: failure - can try again later. |
|
* CSR_TIMEOUT: failure - give up. |
|
* CSR_SELECT: success - proceed. |
|
*/ |
|
|
|
hostdata->selecting = cmd; |
|
|
|
/* Every target has its own synchronous transfer setting, kept in the |
|
* sync_xfer array, and a corresponding status byte in sync_stat[]. |
|
* Each target's sync_stat[] entry is initialized to SX_UNSET, and its |
|
* sync_xfer[] entry is initialized to the default/safe value. SS_UNSET |
|
* means that the parameters are undetermined as yet, and that we |
|
* need to send an SDTR message to this device after selection is |
|
* complete: We set SS_FIRST to tell the interrupt routine to do so. |
|
* If we've been asked not to try synchronous transfers on this |
|
* target (and _all_ luns within it), we'll still send the SDTR message |
|
* later, but at that time we'll negotiate for async by specifying a |
|
* sync fifo depth of 0. |
|
*/ |
|
if (hostdata->sync_stat[cmd->device->id] == SS_UNSET) |
|
hostdata->sync_stat[cmd->device->id] = SS_FIRST; |
|
hostdata->state = S_SELECTING; |
|
write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ |
|
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN); |
|
} else { |
|
|
|
/* |
|
* Do a 'Select-With-ATN-Xfer' command. This will end with |
|
* one of the following interrupts: |
|
* CSR_RESEL_AM: failure - can try again later. |
|
* CSR_TIMEOUT: failure - give up. |
|
* anything else: success - proceed. |
|
*/ |
|
|
|
hostdata->connected = cmd; |
|
write_wd33c93(regs, WD_COMMAND_PHASE, 0); |
|
|
|
/* copy command_descriptor_block into WD chip |
|
* (take advantage of auto-incrementing) |
|
*/ |
|
|
|
write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd); |
|
|
|
/* The wd33c93 only knows about Group 0, 1, and 5 commands when |
|
* it's doing a 'select-and-transfer'. To be safe, we write the |
|
* size of the CDB into the OWN_ID register for every case. This |
|
* way there won't be problems with vendor-unique, audio, etc. |
|
*/ |
|
|
|
write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len); |
|
|
|
/* When doing a non-disconnect command with DMA, we can save |
|
* ourselves a DATA phase interrupt later by setting everything |
|
* up ahead of time. |
|
*/ |
|
|
|
if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) { |
|
if (hostdata->dma_setup(cmd, |
|
(cmd->sc_data_direction == DMA_TO_DEVICE) ? |
|
DATA_OUT_DIR : DATA_IN_DIR)) |
|
write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ |
|
else { |
|
write_wd33c93_count(regs, |
|
cmd->SCp.this_residual); |
|
write_wd33c93(regs, WD_CONTROL, |
|
CTRL_IDI | CTRL_EDI | hostdata->dma_mode); |
|
hostdata->dma = D_DMA_RUNNING; |
|
} |
|
} else |
|
write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ |
|
|
|
hostdata->state = S_RUNNING_LEVEL2; |
|
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); |
|
} |
|
|
|
/* |
|
* Since the SCSI bus can handle only 1 connection at a time, |
|
* we get out of here now. If the selection fails, or when |
|
* the command disconnects, we'll come back to this routine |
|
* to search the input_Q again... |
|
*/ |
|
|
|
DB(DB_EXECUTE, |
|
printk("%s)EX-2 ", (cmd->SCp.phase) ? "d:" : "")) |
|
} |
|
|
|
static void |
|
transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt, |
|
int data_in_dir, struct WD33C93_hostdata *hostdata) |
|
{ |
|
uchar asr; |
|
|
|
DB(DB_TRANSFER, |
|
printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out")) |
|
|
|
write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); |
|
write_wd33c93_count(regs, cnt); |
|
write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO); |
|
if (data_in_dir) { |
|
do { |
|
asr = read_aux_stat(regs); |
|
if (asr & ASR_DBR) |
|
*buf++ = read_wd33c93(regs, WD_DATA); |
|
} while (!(asr & ASR_INT)); |
|
} else { |
|
do { |
|
asr = read_aux_stat(regs); |
|
if (asr & ASR_DBR) |
|
write_wd33c93(regs, WD_DATA, *buf++); |
|
} while (!(asr & ASR_INT)); |
|
} |
|
|
|
/* Note: we are returning with the interrupt UN-cleared. |
|
* Since (presumably) an entire I/O operation has |
|
* completed, the bus phase is probably different, and |
|
* the interrupt routine will discover this when it |
|
* responds to the uncleared int. |
|
*/ |
|
|
|
} |
|
|
|
static void |
|
transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd, |
|
int data_in_dir) |
|
{ |
|
struct WD33C93_hostdata *hostdata; |
|
unsigned long length; |
|
|
|
hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata; |
|
|
|
/* Normally, you'd expect 'this_residual' to be non-zero here. |
|
* In a series of scatter-gather transfers, however, this |
|
* routine will usually be called with 'this_residual' equal |
|
* to 0 and 'buffers_residual' non-zero. This means that a |
|
* previous transfer completed, clearing 'this_residual', and |
|
* now we need to setup the next scatter-gather buffer as the |
|
* source or destination for THIS transfer. |
|
*/ |
|
if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { |
|
cmd->SCp.buffer = sg_next(cmd->SCp.buffer); |
|
--cmd->SCp.buffers_residual; |
|
cmd->SCp.this_residual = cmd->SCp.buffer->length; |
|
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
|
} |
|
if (!cmd->SCp.this_residual) /* avoid bogus setups */ |
|
return; |
|
|
|
write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, |
|
hostdata->sync_xfer[cmd->device->id]); |
|
|
|
/* 'hostdata->no_dma' is TRUE if we don't even want to try DMA. |
|
* Update 'this_residual' and 'ptr' after 'transfer_pio()' returns. |
|
*/ |
|
|
|
if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) { |
|
#ifdef PROC_STATISTICS |
|
hostdata->pio_cnt++; |
|
#endif |
|
transfer_pio(regs, (uchar *) cmd->SCp.ptr, |
|
cmd->SCp.this_residual, data_in_dir, hostdata); |
|
length = cmd->SCp.this_residual; |
|
cmd->SCp.this_residual = read_wd33c93_count(regs); |
|
cmd->SCp.ptr += (length - cmd->SCp.this_residual); |
|
} |
|
|
|
/* We are able to do DMA (in fact, the Amiga hardware is |
|
* already going!), so start up the wd33c93 in DMA mode. |
|
* We set 'hostdata->dma' = D_DMA_RUNNING so that when the |
|
* transfer completes and causes an interrupt, we're |
|
* reminded to tell the Amiga to shut down its end. We'll |
|
* postpone the updating of 'this_residual' and 'ptr' |
|
* until then. |
|
*/ |
|
|
|
else { |
|
#ifdef PROC_STATISTICS |
|
hostdata->dma_cnt++; |
|
#endif |
|
write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode); |
|
write_wd33c93_count(regs, cmd->SCp.this_residual); |
|
|
|
if ((hostdata->level2 >= L2_DATA) || |
|
(hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) { |
|
write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); |
|
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); |
|
hostdata->state = S_RUNNING_LEVEL2; |
|
} else |
|
write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO); |
|
|
|
hostdata->dma = D_DMA_RUNNING; |
|
} |
|
} |
|
|
|
void |
|
wd33c93_intr(struct Scsi_Host *instance) |
|
{ |
|
struct WD33C93_hostdata *hostdata = |
|
(struct WD33C93_hostdata *) instance->hostdata; |
|
const wd33c93_regs regs = hostdata->regs; |
|
struct scsi_cmnd *patch, *cmd; |
|
uchar asr, sr, phs, id, lun, *ucp, msg; |
|
unsigned long length, flags; |
|
|
|
asr = read_aux_stat(regs); |
|
if (!(asr & ASR_INT) || (asr & ASR_BSY)) |
|
return; |
|
|
|
spin_lock_irqsave(&hostdata->lock, flags); |
|
|
|
#ifdef PROC_STATISTICS |
|
hostdata->int_cnt++; |
|
#endif |
|
|
|
cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */ |
|
sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear the interrupt */ |
|
phs = read_wd33c93(regs, WD_COMMAND_PHASE); |
|
|
|
DB(DB_INTR, printk("{%02x:%02x-", asr, sr)) |
|
|
|
/* After starting a DMA transfer, the next interrupt |
|
* is guaranteed to be in response to completion of |
|
* the transfer. Since the Amiga DMA hardware runs in |
|
* in an open-ended fashion, it needs to be told when |
|
* to stop; do that here if D_DMA_RUNNING is true. |
|
* Also, we have to update 'this_residual' and 'ptr' |
|
* based on the contents of the TRANSFER_COUNT register, |
|
* in case the device decided to do an intermediate |
|
* disconnect (a device may do this if it has to do a |
|
* seek, or just to be nice and let other devices have |
|
* some bus time during long transfers). After doing |
|
* whatever is needed, we go on and service the WD3393 |
|
* interrupt normally. |
|
*/ |
|
if (hostdata->dma == D_DMA_RUNNING) { |
|
DB(DB_TRANSFER, |
|
printk("[%p/%d:", cmd->SCp.ptr, cmd->SCp.this_residual)) |
|
hostdata->dma_stop(cmd->device->host, cmd, 1); |
|
hostdata->dma = D_DMA_OFF; |
|
length = cmd->SCp.this_residual; |
|
cmd->SCp.this_residual = read_wd33c93_count(regs); |
|
cmd->SCp.ptr += (length - cmd->SCp.this_residual); |
|
DB(DB_TRANSFER, |
|
printk("%p/%d]", cmd->SCp.ptr, cmd->SCp.this_residual)) |
|
} |
|
|
|
/* Respond to the specific WD3393 interrupt - there are quite a few! */ |
|
switch (sr) { |
|
case CSR_TIMEOUT: |
|
DB(DB_INTR, printk("TIMEOUT")) |
|
|
|
if (hostdata->state == S_RUNNING_LEVEL2) |
|
hostdata->connected = NULL; |
|
else { |
|
cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */ |
|
hostdata->selecting = NULL; |
|
} |
|
|
|
cmd->result = DID_NO_CONNECT << 16; |
|
hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); |
|
hostdata->state = S_UNCONNECTED; |
|
cmd->scsi_done(cmd); |
|
|
|
/* From esp.c: |
|
* There is a window of time within the scsi_done() path |
|
* of execution where interrupts are turned back on full |
|
* blast and left that way. During that time we could |
|
* reconnect to a disconnected command, then we'd bomb |
|
* out below. We could also end up executing two commands |
|
* at _once_. ...just so you know why the restore_flags() |
|
* is here... |
|
*/ |
|
|
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
|
|
/* We are not connected to a target - check to see if there |
|
* are commands waiting to be executed. |
|
*/ |
|
|
|
wd33c93_execute(instance); |
|
break; |
|
|
|
/* Note: this interrupt should not occur in a LEVEL2 command */ |
|
|
|
case CSR_SELECT: |
|
DB(DB_INTR, printk("SELECT")) |
|
hostdata->connected = cmd = |
|
(struct scsi_cmnd *) hostdata->selecting; |
|
hostdata->selecting = NULL; |
|
|
|
/* construct an IDENTIFY message with correct disconnect bit */ |
|
|
|
hostdata->outgoing_msg[0] = IDENTIFY(0, cmd->device->lun); |
|
if (cmd->SCp.phase) |
|
hostdata->outgoing_msg[0] |= 0x40; |
|
|
|
if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) { |
|
|
|
hostdata->sync_stat[cmd->device->id] = SS_WAITING; |
|
|
|
/* Tack on a 2nd message to ask about synchronous transfers. If we've |
|
* been asked to do only asynchronous transfers on this device, we |
|
* request a fifo depth of 0, which is equivalent to async - should |
|
* solve the problems some people have had with GVP's Guru ROM. |
|
*/ |
|
|
|
hostdata->outgoing_msg[1] = EXTENDED_MESSAGE; |
|
hostdata->outgoing_msg[2] = 3; |
|
hostdata->outgoing_msg[3] = EXTENDED_SDTR; |
|
if (hostdata->no_sync & (1 << cmd->device->id)) { |
|
calc_sync_msg(hostdata->default_sx_per, 0, |
|
0, hostdata->outgoing_msg + 4); |
|
} else { |
|
calc_sync_msg(optimum_sx_per(hostdata), |
|
OPTIMUM_SX_OFF, |
|
hostdata->fast, |
|
hostdata->outgoing_msg + 4); |
|
} |
|
hostdata->outgoing_len = 6; |
|
#ifdef SYNC_DEBUG |
|
ucp = hostdata->outgoing_msg + 1; |
|
printk(" sending SDTR %02x03%02x%02x%02x ", |
|
ucp[0], ucp[2], ucp[3], ucp[4]); |
|
#endif |
|
} else |
|
hostdata->outgoing_len = 1; |
|
|
|
hostdata->state = S_CONNECTED; |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
break; |
|
|
|
case CSR_XFER_DONE | PHS_DATA_IN: |
|
case CSR_UNEXP | PHS_DATA_IN: |
|
case CSR_SRV_REQ | PHS_DATA_IN: |
|
DB(DB_INTR, |
|
printk("IN-%d.%d", cmd->SCp.this_residual, |
|
cmd->SCp.buffers_residual)) |
|
transfer_bytes(regs, cmd, DATA_IN_DIR); |
|
if (hostdata->state != S_RUNNING_LEVEL2) |
|
hostdata->state = S_CONNECTED; |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
break; |
|
|
|
case CSR_XFER_DONE | PHS_DATA_OUT: |
|
case CSR_UNEXP | PHS_DATA_OUT: |
|
case CSR_SRV_REQ | PHS_DATA_OUT: |
|
DB(DB_INTR, |
|
printk("OUT-%d.%d", cmd->SCp.this_residual, |
|
cmd->SCp.buffers_residual)) |
|
transfer_bytes(regs, cmd, DATA_OUT_DIR); |
|
if (hostdata->state != S_RUNNING_LEVEL2) |
|
hostdata->state = S_CONNECTED; |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
break; |
|
|
|
/* Note: this interrupt should not occur in a LEVEL2 command */ |
|
|
|
case CSR_XFER_DONE | PHS_COMMAND: |
|
case CSR_UNEXP | PHS_COMMAND: |
|
case CSR_SRV_REQ | PHS_COMMAND: |
|
DB(DB_INTR, printk("CMND-%02x", cmd->cmnd[0])) |
|
transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR, |
|
hostdata); |
|
hostdata->state = S_CONNECTED; |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
break; |
|
|
|
case CSR_XFER_DONE | PHS_STATUS: |
|
case CSR_UNEXP | PHS_STATUS: |
|
case CSR_SRV_REQ | PHS_STATUS: |
|
DB(DB_INTR, printk("STATUS=")) |
|
cmd->SCp.Status = read_1_byte(regs); |
|
DB(DB_INTR, printk("%02x", cmd->SCp.Status)) |
|
if (hostdata->level2 >= L2_BASIC) { |
|
sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */ |
|
udelay(7); |
|
hostdata->state = S_RUNNING_LEVEL2; |
|
write_wd33c93(regs, WD_COMMAND_PHASE, 0x50); |
|
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); |
|
} else { |
|
hostdata->state = S_CONNECTED; |
|
} |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
break; |
|
|
|
case CSR_XFER_DONE | PHS_MESS_IN: |
|
case CSR_UNEXP | PHS_MESS_IN: |
|
case CSR_SRV_REQ | PHS_MESS_IN: |
|
DB(DB_INTR, printk("MSG_IN=")) |
|
|
|
msg = read_1_byte(regs); |
|
sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */ |
|
udelay(7); |
|
|
|
hostdata->incoming_msg[hostdata->incoming_ptr] = msg; |
|
if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE) |
|
msg = EXTENDED_MESSAGE; |
|
else |
|
hostdata->incoming_ptr = 0; |
|
|
|
cmd->SCp.Message = msg; |
|
switch (msg) { |
|
|
|
case COMMAND_COMPLETE: |
|
DB(DB_INTR, printk("CCMP")) |
|
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); |
|
hostdata->state = S_PRE_CMP_DISC; |
|
break; |
|
|
|
case SAVE_POINTERS: |
|
DB(DB_INTR, printk("SDP")) |
|
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); |
|
hostdata->state = S_CONNECTED; |
|
break; |
|
|
|
case RESTORE_POINTERS: |
|
DB(DB_INTR, printk("RDP")) |
|
if (hostdata->level2 >= L2_BASIC) { |
|
write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); |
|
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); |
|
hostdata->state = S_RUNNING_LEVEL2; |
|
} else { |
|
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); |
|
hostdata->state = S_CONNECTED; |
|
} |
|
break; |
|
|
|
case DISCONNECT: |
|
DB(DB_INTR, printk("DIS")) |
|
cmd->device->disconnect = 1; |
|
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); |
|
hostdata->state = S_PRE_TMP_DISC; |
|
break; |
|
|
|
case MESSAGE_REJECT: |
|
DB(DB_INTR, printk("REJ")) |
|
#ifdef SYNC_DEBUG |
|
printk("-REJ-"); |
|
#endif |
|
if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) { |
|
hostdata->sync_stat[cmd->device->id] = SS_SET; |
|
/* we want default_sx_per, not DEFAULT_SX_PER */ |
|
hostdata->sync_xfer[cmd->device->id] = |
|
calc_sync_xfer(hostdata->default_sx_per |
|
/ 4, 0, 0, hostdata->sx_table); |
|
} |
|
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); |
|
hostdata->state = S_CONNECTED; |
|
break; |
|
|
|
case EXTENDED_MESSAGE: |
|
DB(DB_INTR, printk("EXT")) |
|
|
|
ucp = hostdata->incoming_msg; |
|
|
|
#ifdef SYNC_DEBUG |
|
printk("%02x", ucp[hostdata->incoming_ptr]); |
|
#endif |
|
/* Is this the last byte of the extended message? */ |
|
|
|
if ((hostdata->incoming_ptr >= 2) && |
|
(hostdata->incoming_ptr == (ucp[1] + 1))) { |
|
|
|
switch (ucp[2]) { /* what's the EXTENDED code? */ |
|
case EXTENDED_SDTR: |
|
/* default to default async period */ |
|
id = calc_sync_xfer(hostdata-> |
|
default_sx_per / 4, 0, |
|
0, hostdata->sx_table); |
|
if (hostdata->sync_stat[cmd->device->id] != |
|
SS_WAITING) { |
|
|
|
/* A device has sent an unsolicited SDTR message; rather than go |
|
* through the effort of decoding it and then figuring out what |
|
* our reply should be, we're just gonna say that we have a |
|
* synchronous fifo depth of 0. This will result in asynchronous |
|
* transfers - not ideal but so much easier. |
|
* Actually, this is OK because it assures us that if we don't |
|
* specifically ask for sync transfers, we won't do any. |
|
*/ |
|
|
|
write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ |
|
hostdata->outgoing_msg[0] = |
|
EXTENDED_MESSAGE; |
|
hostdata->outgoing_msg[1] = 3; |
|
hostdata->outgoing_msg[2] = |
|
EXTENDED_SDTR; |
|
calc_sync_msg(hostdata-> |
|
default_sx_per, 0, |
|
0, hostdata->outgoing_msg + 3); |
|
hostdata->outgoing_len = 5; |
|
} else { |
|
if (ucp[4]) /* well, sync transfer */ |
|
id = calc_sync_xfer(ucp[3], ucp[4], |
|
hostdata->fast, |
|
hostdata->sx_table); |
|
else if (ucp[3]) /* very unlikely... */ |
|
id = calc_sync_xfer(ucp[3], ucp[4], |
|
0, hostdata->sx_table); |
|
} |
|
hostdata->sync_xfer[cmd->device->id] = id; |
|
#ifdef SYNC_DEBUG |
|
printk(" sync_xfer=%02x\n", |
|
hostdata->sync_xfer[cmd->device->id]); |
|
#endif |
|
hostdata->sync_stat[cmd->device->id] = |
|
SS_SET; |
|
write_wd33c93_cmd(regs, |
|
WD_CMD_NEGATE_ACK); |
|
hostdata->state = S_CONNECTED; |
|
break; |
|
case EXTENDED_WDTR: |
|
write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ |
|
printk("sending WDTR "); |
|
hostdata->outgoing_msg[0] = |
|
EXTENDED_MESSAGE; |
|
hostdata->outgoing_msg[1] = 2; |
|
hostdata->outgoing_msg[2] = |
|
EXTENDED_WDTR; |
|
hostdata->outgoing_msg[3] = 0; /* 8 bit transfer width */ |
|
hostdata->outgoing_len = 4; |
|
write_wd33c93_cmd(regs, |
|
WD_CMD_NEGATE_ACK); |
|
hostdata->state = S_CONNECTED; |
|
break; |
|
default: |
|
write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ |
|
printk |
|
("Rejecting Unknown Extended Message(%02x). ", |
|
ucp[2]); |
|
hostdata->outgoing_msg[0] = |
|
MESSAGE_REJECT; |
|
hostdata->outgoing_len = 1; |
|
write_wd33c93_cmd(regs, |
|
WD_CMD_NEGATE_ACK); |
|
hostdata->state = S_CONNECTED; |
|
break; |
|
} |
|
hostdata->incoming_ptr = 0; |
|
} |
|
|
|
/* We need to read more MESS_IN bytes for the extended message */ |
|
|
|
else { |
|
hostdata->incoming_ptr++; |
|
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); |
|
hostdata->state = S_CONNECTED; |
|
} |
|
break; |
|
|
|
default: |
|
printk("Rejecting Unknown Message(%02x) ", msg); |
|
write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ |
|
hostdata->outgoing_msg[0] = MESSAGE_REJECT; |
|
hostdata->outgoing_len = 1; |
|
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); |
|
hostdata->state = S_CONNECTED; |
|
} |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
break; |
|
|
|
/* Note: this interrupt will occur only after a LEVEL2 command */ |
|
|
|
case CSR_SEL_XFER_DONE: |
|
|
|
/* Make sure that reselection is enabled at this point - it may |
|
* have been turned off for the command that just completed. |
|
*/ |
|
|
|
write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); |
|
if (phs == 0x60) { |
|
DB(DB_INTR, printk("SX-DONE")) |
|
cmd->SCp.Message = COMMAND_COMPLETE; |
|
lun = read_wd33c93(regs, WD_TARGET_LUN); |
|
DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun)) |
|
hostdata->connected = NULL; |
|
hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); |
|
hostdata->state = S_UNCONNECTED; |
|
if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE) |
|
cmd->SCp.Status = lun; |
|
if (cmd->cmnd[0] == REQUEST_SENSE |
|
&& cmd->SCp.Status != SAM_STAT_GOOD) { |
|
set_host_byte(cmd, DID_ERROR); |
|
} else { |
|
set_host_byte(cmd, DID_OK); |
|
scsi_msg_to_host_byte(cmd, cmd->SCp.Message); |
|
set_status_byte(cmd, cmd->SCp.Status); |
|
} |
|
cmd->scsi_done(cmd); |
|
|
|
/* We are no longer connected to a target - check to see if |
|
* there are commands waiting to be executed. |
|
*/ |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
wd33c93_execute(instance); |
|
} else { |
|
printk |
|
("%02x:%02x:%02x: Unknown SEL_XFER_DONE phase!!---", |
|
asr, sr, phs); |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
} |
|
break; |
|
|
|
/* Note: this interrupt will occur only after a LEVEL2 command */ |
|
|
|
case CSR_SDP: |
|
DB(DB_INTR, printk("SDP")) |
|
hostdata->state = S_RUNNING_LEVEL2; |
|
write_wd33c93(regs, WD_COMMAND_PHASE, 0x41); |
|
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
break; |
|
|
|
case CSR_XFER_DONE | PHS_MESS_OUT: |
|
case CSR_UNEXP | PHS_MESS_OUT: |
|
case CSR_SRV_REQ | PHS_MESS_OUT: |
|
DB(DB_INTR, printk("MSG_OUT=")) |
|
|
|
/* To get here, we've probably requested MESSAGE_OUT and have |
|
* already put the correct bytes in outgoing_msg[] and filled |
|
* in outgoing_len. We simply send them out to the SCSI bus. |
|
* Sometimes we get MESSAGE_OUT phase when we're not expecting |
|
* it - like when our SDTR message is rejected by a target. Some |
|
* targets send the REJECT before receiving all of the extended |
|
* message, and then seem to go back to MESSAGE_OUT for a byte |
|
* or two. Not sure why, or if I'm doing something wrong to |
|
* cause this to happen. Regardless, it seems that sending |
|
* NOP messages in these situations results in no harm and |
|
* makes everyone happy. |
|
*/ |
|
if (hostdata->outgoing_len == 0) { |
|
hostdata->outgoing_len = 1; |
|
hostdata->outgoing_msg[0] = NOP; |
|
} |
|
transfer_pio(regs, hostdata->outgoing_msg, |
|
hostdata->outgoing_len, DATA_OUT_DIR, hostdata); |
|
DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0])) |
|
hostdata->outgoing_len = 0; |
|
hostdata->state = S_CONNECTED; |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
break; |
|
|
|
case CSR_UNEXP_DISC: |
|
|
|
/* I think I've seen this after a request-sense that was in response |
|
* to an error condition, but not sure. We certainly need to do |
|
* something when we get this interrupt - the question is 'what?'. |
|
* Let's think positively, and assume some command has finished |
|
* in a legal manner (like a command that provokes a request-sense), |
|
* so we treat it as a normal command-complete-disconnect. |
|
*/ |
|
|
|
/* Make sure that reselection is enabled at this point - it may |
|
* have been turned off for the command that just completed. |
|
*/ |
|
|
|
write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); |
|
if (cmd == NULL) { |
|
printk(" - Already disconnected! "); |
|
hostdata->state = S_UNCONNECTED; |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
return; |
|
} |
|
DB(DB_INTR, printk("UNEXP_DISC")) |
|
hostdata->connected = NULL; |
|
hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); |
|
hostdata->state = S_UNCONNECTED; |
|
if (cmd->cmnd[0] == REQUEST_SENSE && |
|
cmd->SCp.Status != SAM_STAT_GOOD) { |
|
set_host_byte(cmd, DID_ERROR); |
|
} else { |
|
set_host_byte(cmd, DID_OK); |
|
scsi_msg_to_host_byte(cmd, cmd->SCp.Message); |
|
set_status_byte(cmd, cmd->SCp.Status); |
|
} |
|
cmd->scsi_done(cmd); |
|
|
|
/* We are no longer connected to a target - check to see if |
|
* there are commands waiting to be executed. |
|
*/ |
|
/* look above for comments on scsi_done() */ |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
wd33c93_execute(instance); |
|
break; |
|
|
|
case CSR_DISC: |
|
|
|
/* Make sure that reselection is enabled at this point - it may |
|
* have been turned off for the command that just completed. |
|
*/ |
|
|
|
write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); |
|
DB(DB_INTR, printk("DISC")) |
|
if (cmd == NULL) { |
|
printk(" - Already disconnected! "); |
|
hostdata->state = S_UNCONNECTED; |
|
} |
|
switch (hostdata->state) { |
|
case S_PRE_CMP_DISC: |
|
hostdata->connected = NULL; |
|
hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); |
|
hostdata->state = S_UNCONNECTED; |
|
DB(DB_INTR, printk(":%d", cmd->SCp.Status)) |
|
if (cmd->cmnd[0] == REQUEST_SENSE |
|
&& cmd->SCp.Status != SAM_STAT_GOOD) { |
|
set_host_byte(cmd, DID_ERROR); |
|
} else { |
|
set_host_byte(cmd, DID_OK); |
|
scsi_msg_to_host_byte(cmd, cmd->SCp.Message); |
|
set_status_byte(cmd, cmd->SCp.Status); |
|
} |
|
cmd->scsi_done(cmd); |
|
break; |
|
case S_PRE_TMP_DISC: |
|
case S_RUNNING_LEVEL2: |
|
cmd->host_scribble = (uchar *) hostdata->disconnected_Q; |
|
hostdata->disconnected_Q = cmd; |
|
hostdata->connected = NULL; |
|
hostdata->state = S_UNCONNECTED; |
|
|
|
#ifdef PROC_STATISTICS |
|
hostdata->disc_done_cnt[cmd->device->id]++; |
|
#endif |
|
|
|
break; |
|
default: |
|
printk("*** Unexpected DISCONNECT interrupt! ***"); |
|
hostdata->state = S_UNCONNECTED; |
|
} |
|
|
|
/* We are no longer connected to a target - check to see if |
|
* there are commands waiting to be executed. |
|
*/ |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
wd33c93_execute(instance); |
|
break; |
|
|
|
case CSR_RESEL_AM: |
|
case CSR_RESEL: |
|
DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : "")) |
|
|
|
/* Old chips (pre -A ???) don't have advanced features and will |
|
* generate CSR_RESEL. In that case we have to extract the LUN the |
|
* hard way (see below). |
|
* First we have to make sure this reselection didn't |
|
* happen during Arbitration/Selection of some other device. |
|
* If yes, put losing command back on top of input_Q. |
|
*/ |
|
if (hostdata->level2 <= L2_NONE) { |
|
|
|
if (hostdata->selecting) { |
|
cmd = (struct scsi_cmnd *) hostdata->selecting; |
|
hostdata->selecting = NULL; |
|
hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); |
|
cmd->host_scribble = |
|
(uchar *) hostdata->input_Q; |
|
hostdata->input_Q = cmd; |
|
} |
|
} |
|
|
|
else { |
|
|
|
if (cmd) { |
|
if (phs == 0x00) { |
|
hostdata->busy[cmd->device->id] &= |
|
~(1 << (cmd->device->lun & 0xff)); |
|
cmd->host_scribble = |
|
(uchar *) hostdata->input_Q; |
|
hostdata->input_Q = cmd; |
|
} else { |
|
printk |
|
("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---", |
|
asr, sr, phs); |
|
while (1) |
|
printk("\r"); |
|
} |
|
} |
|
|
|
} |
|
|
|
/* OK - find out which device reselected us. */ |
|
|
|
id = read_wd33c93(regs, WD_SOURCE_ID); |
|
id &= SRCID_MASK; |
|
|
|
/* and extract the lun from the ID message. (Note that we don't |
|
* bother to check for a valid message here - I guess this is |
|
* not the right way to go, but...) |
|
*/ |
|
|
|
if (sr == CSR_RESEL_AM) { |
|
lun = read_wd33c93(regs, WD_DATA); |
|
if (hostdata->level2 < L2_RESELECT) |
|
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); |
|
lun &= 7; |
|
} else { |
|
/* Old chip; wait for msgin phase to pick up the LUN. */ |
|
for (lun = 255; lun; lun--) { |
|
if ((asr = read_aux_stat(regs)) & ASR_INT) |
|
break; |
|
udelay(10); |
|
} |
|
if (!(asr & ASR_INT)) { |
|
printk |
|
("wd33c93: Reselected without IDENTIFY\n"); |
|
lun = 0; |
|
} else { |
|
/* Verify this is a change to MSG_IN and read the message */ |
|
sr = read_wd33c93(regs, WD_SCSI_STATUS); |
|
udelay(7); |
|
if (sr == (CSR_ABORT | PHS_MESS_IN) || |
|
sr == (CSR_UNEXP | PHS_MESS_IN) || |
|
sr == (CSR_SRV_REQ | PHS_MESS_IN)) { |
|
/* Got MSG_IN, grab target LUN */ |
|
lun = read_1_byte(regs); |
|
/* Now we expect a 'paused with ACK asserted' int.. */ |
|
asr = read_aux_stat(regs); |
|
if (!(asr & ASR_INT)) { |
|
udelay(10); |
|
asr = read_aux_stat(regs); |
|
if (!(asr & ASR_INT)) |
|
printk |
|
("wd33c93: No int after LUN on RESEL (%02x)\n", |
|
asr); |
|
} |
|
sr = read_wd33c93(regs, WD_SCSI_STATUS); |
|
udelay(7); |
|
if (sr != CSR_MSGIN) |
|
printk |
|
("wd33c93: Not paused with ACK on RESEL (%02x)\n", |
|
sr); |
|
lun &= 7; |
|
write_wd33c93_cmd(regs, |
|
WD_CMD_NEGATE_ACK); |
|
} else { |
|
printk |
|
("wd33c93: Not MSG_IN on reselect (%02x)\n", |
|
sr); |
|
lun = 0; |
|
} |
|
} |
|
} |
|
|
|
/* Now we look for the command that's reconnecting. */ |
|
|
|
cmd = (struct scsi_cmnd *) hostdata->disconnected_Q; |
|
patch = NULL; |
|
while (cmd) { |
|
if (id == cmd->device->id && lun == (u8)cmd->device->lun) |
|
break; |
|
patch = cmd; |
|
cmd = (struct scsi_cmnd *) cmd->host_scribble; |
|
} |
|
|
|
/* Hmm. Couldn't find a valid command.... What to do? */ |
|
|
|
if (!cmd) { |
|
printk |
|
("---TROUBLE: target %d.%d not in disconnect queue---", |
|
id, (u8)lun); |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
return; |
|
} |
|
|
|
/* Ok, found the command - now start it up again. */ |
|
|
|
if (patch) |
|
patch->host_scribble = cmd->host_scribble; |
|
else |
|
hostdata->disconnected_Q = |
|
(struct scsi_cmnd *) cmd->host_scribble; |
|
hostdata->connected = cmd; |
|
|
|
/* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]' |
|
* because these things are preserved over a disconnect. |
|
* But we DO need to fix the DPD bit so it's correct for this command. |
|
*/ |
|
|
|
if (cmd->sc_data_direction == DMA_TO_DEVICE) |
|
write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id); |
|
else |
|
write_wd33c93(regs, WD_DESTINATION_ID, |
|
cmd->device->id | DSTID_DPD); |
|
if (hostdata->level2 >= L2_RESELECT) { |
|
write_wd33c93_count(regs, 0); /* we want a DATA_PHASE interrupt */ |
|
write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); |
|
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); |
|
hostdata->state = S_RUNNING_LEVEL2; |
|
} else |
|
hostdata->state = S_CONNECTED; |
|
|
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
break; |
|
|
|
default: |
|
printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs); |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
} |
|
|
|
DB(DB_INTR, printk("} ")) |
|
|
|
} |
|
|
|
static void |
|
reset_wd33c93(struct Scsi_Host *instance) |
|
{ |
|
struct WD33C93_hostdata *hostdata = |
|
(struct WD33C93_hostdata *) instance->hostdata; |
|
const wd33c93_regs regs = hostdata->regs; |
|
uchar sr; |
|
|
|
#ifdef CONFIG_SGI_IP22 |
|
{ |
|
int busycount = 0; |
|
extern void sgiwd93_reset(unsigned long); |
|
/* wait 'til the chip gets some time for us */ |
|
while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100) |
|
udelay (10); |
|
/* |
|
* there are scsi devices out there, which manage to lock up |
|
* the wd33c93 in a busy condition. In this state it won't |
|
* accept the reset command. The only way to solve this is to |
|
* give the chip a hardware reset (if possible). The code below |
|
* does this for the SGI Indy, where this is possible |
|
*/ |
|
/* still busy ? */ |
|
if (read_aux_stat(regs) & ASR_BSY) |
|
sgiwd93_reset(instance->base); /* yeah, give it the hard one */ |
|
} |
|
#endif |
|
|
|
write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF | |
|
instance->this_id | hostdata->clock_freq); |
|
write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); |
|
write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, |
|
calc_sync_xfer(hostdata->default_sx_per / 4, |
|
DEFAULT_SX_OFF, 0, hostdata->sx_table)); |
|
write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET); |
|
|
|
|
|
#ifdef CONFIG_MVME147_SCSI |
|
udelay(25); /* The old wd33c93 on MVME147 needs this, at least */ |
|
#endif |
|
|
|
while (!(read_aux_stat(regs) & ASR_INT)) |
|
; |
|
sr = read_wd33c93(regs, WD_SCSI_STATUS); |
|
|
|
hostdata->microcode = read_wd33c93(regs, WD_CDB_1); |
|
if (sr == 0x00) |
|
hostdata->chip = C_WD33C93; |
|
else if (sr == 0x01) { |
|
write_wd33c93(regs, WD_QUEUE_TAG, 0xa5); /* any random number */ |
|
sr = read_wd33c93(regs, WD_QUEUE_TAG); |
|
if (sr == 0xa5) { |
|
hostdata->chip = C_WD33C93B; |
|
write_wd33c93(regs, WD_QUEUE_TAG, 0); |
|
} else |
|
hostdata->chip = C_WD33C93A; |
|
} else |
|
hostdata->chip = C_UNKNOWN_CHIP; |
|
|
|
if (hostdata->chip != C_WD33C93B) /* Fast SCSI unavailable */ |
|
hostdata->fast = 0; |
|
|
|
write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE); |
|
write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); |
|
} |
|
|
|
int |
|
wd33c93_host_reset(struct scsi_cmnd * SCpnt) |
|
{ |
|
struct Scsi_Host *instance; |
|
struct WD33C93_hostdata *hostdata; |
|
int i; |
|
|
|
instance = SCpnt->device->host; |
|
spin_lock_irq(instance->host_lock); |
|
hostdata = (struct WD33C93_hostdata *) instance->hostdata; |
|
|
|
printk("scsi%d: reset. ", instance->host_no); |
|
disable_irq(instance->irq); |
|
|
|
hostdata->dma_stop(instance, NULL, 0); |
|
for (i = 0; i < 8; i++) { |
|
hostdata->busy[i] = 0; |
|
hostdata->sync_xfer[i] = |
|
calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF, |
|
0, hostdata->sx_table); |
|
hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */ |
|
} |
|
hostdata->input_Q = NULL; |
|
hostdata->selecting = NULL; |
|
hostdata->connected = NULL; |
|
hostdata->disconnected_Q = NULL; |
|
hostdata->state = S_UNCONNECTED; |
|
hostdata->dma = D_DMA_OFF; |
|
hostdata->incoming_ptr = 0; |
|
hostdata->outgoing_len = 0; |
|
|
|
reset_wd33c93(instance); |
|
SCpnt->result = DID_RESET << 16; |
|
enable_irq(instance->irq); |
|
spin_unlock_irq(instance->host_lock); |
|
return SUCCESS; |
|
} |
|
|
|
int |
|
wd33c93_abort(struct scsi_cmnd * cmd) |
|
{ |
|
struct Scsi_Host *instance; |
|
struct WD33C93_hostdata *hostdata; |
|
wd33c93_regs regs; |
|
struct scsi_cmnd *tmp, *prev; |
|
|
|
disable_irq(cmd->device->host->irq); |
|
|
|
instance = cmd->device->host; |
|
hostdata = (struct WD33C93_hostdata *) instance->hostdata; |
|
regs = hostdata->regs; |
|
|
|
/* |
|
* Case 1 : If the command hasn't been issued yet, we simply remove it |
|
* from the input_Q. |
|
*/ |
|
|
|
tmp = (struct scsi_cmnd *) hostdata->input_Q; |
|
prev = NULL; |
|
while (tmp) { |
|
if (tmp == cmd) { |
|
if (prev) |
|
prev->host_scribble = cmd->host_scribble; |
|
else |
|
hostdata->input_Q = |
|
(struct scsi_cmnd *) cmd->host_scribble; |
|
cmd->host_scribble = NULL; |
|
cmd->result = DID_ABORT << 16; |
|
printk |
|
("scsi%d: Abort - removing command from input_Q. ", |
|
instance->host_no); |
|
enable_irq(cmd->device->host->irq); |
|
cmd->scsi_done(cmd); |
|
return SUCCESS; |
|
} |
|
prev = tmp; |
|
tmp = (struct scsi_cmnd *) tmp->host_scribble; |
|
} |
|
|
|
/* |
|
* Case 2 : If the command is connected, we're going to fail the abort |
|
* and let the high level SCSI driver retry at a later time or |
|
* issue a reset. |
|
* |
|
* Timeouts, and therefore aborted commands, will be highly unlikely |
|
* and handling them cleanly in this situation would make the common |
|
* case of noresets less efficient, and would pollute our code. So, |
|
* we fail. |
|
*/ |
|
|
|
if (hostdata->connected == cmd) { |
|
uchar sr, asr; |
|
unsigned long timeout; |
|
|
|
printk("scsi%d: Aborting connected command - ", |
|
instance->host_no); |
|
|
|
printk("stopping DMA - "); |
|
if (hostdata->dma == D_DMA_RUNNING) { |
|
hostdata->dma_stop(instance, cmd, 0); |
|
hostdata->dma = D_DMA_OFF; |
|
} |
|
|
|
printk("sending wd33c93 ABORT command - "); |
|
write_wd33c93(regs, WD_CONTROL, |
|
CTRL_IDI | CTRL_EDI | CTRL_POLLED); |
|
write_wd33c93_cmd(regs, WD_CMD_ABORT); |
|
|
|
/* Now we have to attempt to flush out the FIFO... */ |
|
|
|
printk("flushing fifo - "); |
|
timeout = 1000000; |
|
do { |
|
asr = read_aux_stat(regs); |
|
if (asr & ASR_DBR) |
|
read_wd33c93(regs, WD_DATA); |
|
} while (!(asr & ASR_INT) && timeout-- > 0); |
|
sr = read_wd33c93(regs, WD_SCSI_STATUS); |
|
printk |
|
("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ", |
|
asr, sr, read_wd33c93_count(regs), timeout); |
|
|
|
/* |
|
* Abort command processed. |
|
* Still connected. |
|
* We must disconnect. |
|
*/ |
|
|
|
printk("sending wd33c93 DISCONNECT command - "); |
|
write_wd33c93_cmd(regs, WD_CMD_DISCONNECT); |
|
|
|
timeout = 1000000; |
|
asr = read_aux_stat(regs); |
|
while ((asr & ASR_CIP) && timeout-- > 0) |
|
asr = read_aux_stat(regs); |
|
sr = read_wd33c93(regs, WD_SCSI_STATUS); |
|
printk("asr=%02x, sr=%02x.", asr, sr); |
|
|
|
hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); |
|
hostdata->connected = NULL; |
|
hostdata->state = S_UNCONNECTED; |
|
cmd->result = DID_ABORT << 16; |
|
|
|
/* sti();*/ |
|
wd33c93_execute(instance); |
|
|
|
enable_irq(cmd->device->host->irq); |
|
cmd->scsi_done(cmd); |
|
return SUCCESS; |
|
} |
|
|
|
/* |
|
* Case 3: If the command is currently disconnected from the bus, |
|
* we're not going to expend much effort here: Let's just return |
|
* an ABORT_SNOOZE and hope for the best... |
|
*/ |
|
|
|
tmp = (struct scsi_cmnd *) hostdata->disconnected_Q; |
|
while (tmp) { |
|
if (tmp == cmd) { |
|
printk |
|
("scsi%d: Abort - command found on disconnected_Q - ", |
|
instance->host_no); |
|
printk("Abort SNOOZE. "); |
|
enable_irq(cmd->device->host->irq); |
|
return FAILED; |
|
} |
|
tmp = (struct scsi_cmnd *) tmp->host_scribble; |
|
} |
|
|
|
/* |
|
* Case 4 : If we reached this point, the command was not found in any of |
|
* the queues. |
|
* |
|
* We probably reached this point because of an unlikely race condition |
|
* between the command completing successfully and the abortion code, |
|
* so we won't panic, but we will notify the user in case something really |
|
* broke. |
|
*/ |
|
|
|
/* sti();*/ |
|
wd33c93_execute(instance); |
|
|
|
enable_irq(cmd->device->host->irq); |
|
printk("scsi%d: warning : SCSI command probably completed successfully" |
|
" before abortion. ", instance->host_no); |
|
return FAILED; |
|
} |
|
|
|
#define MAX_WD33C93_HOSTS 4 |
|
#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args) |
|
#define SETUP_BUFFER_SIZE 200 |
|
static char setup_buffer[SETUP_BUFFER_SIZE]; |
|
static char setup_used[MAX_SETUP_ARGS]; |
|
static int done_setup = 0; |
|
|
|
static int |
|
wd33c93_setup(char *str) |
|
{ |
|
int i; |
|
char *p1, *p2; |
|
|
|
/* The kernel does some processing of the command-line before calling |
|
* this function: If it begins with any decimal or hex number arguments, |
|
* ints[0] = how many numbers found and ints[1] through [n] are the values |
|
* themselves. str points to where the non-numeric arguments (if any) |
|
* start: We do our own parsing of those. We construct synthetic 'nosync' |
|
* keywords out of numeric args (to maintain compatibility with older |
|
* versions) and then add the rest of the arguments. |
|
*/ |
|
|
|
p1 = setup_buffer; |
|
*p1 = '\0'; |
|
if (str) |
|
strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer)); |
|
setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0'; |
|
p1 = setup_buffer; |
|
i = 0; |
|
while (*p1 && (i < MAX_SETUP_ARGS)) { |
|
p2 = strchr(p1, ','); |
|
if (p2) { |
|
*p2 = '\0'; |
|
if (p1 != p2) |
|
setup_args[i] = p1; |
|
p1 = p2 + 1; |
|
i++; |
|
} else { |
|
setup_args[i] = p1; |
|
break; |
|
} |
|
} |
|
for (i = 0; i < MAX_SETUP_ARGS; i++) |
|
setup_used[i] = 0; |
|
done_setup = 1; |
|
|
|
return 1; |
|
} |
|
__setup("wd33c93=", wd33c93_setup); |
|
|
|
/* check_setup_args() returns index if key found, 0 if not |
|
*/ |
|
static int |
|
check_setup_args(char *key, int *flags, int *val, char *buf) |
|
{ |
|
int x; |
|
char *cp; |
|
|
|
for (x = 0; x < MAX_SETUP_ARGS; x++) { |
|
if (setup_used[x]) |
|
continue; |
|
if (!strncmp(setup_args[x], key, strlen(key))) |
|
break; |
|
if (!strncmp(setup_args[x], "next", strlen("next"))) |
|
return 0; |
|
} |
|
if (x == MAX_SETUP_ARGS) |
|
return 0; |
|
setup_used[x] = 1; |
|
cp = setup_args[x] + strlen(key); |
|
*val = -1; |
|
if (*cp != ':') |
|
return ++x; |
|
cp++; |
|
if ((*cp >= '0') && (*cp <= '9')) { |
|
*val = simple_strtoul(cp, NULL, 0); |
|
} |
|
return ++x; |
|
} |
|
|
|
/* |
|
* Calculate internal data-transfer-clock cycle from input-clock |
|
* frequency (/MHz) and fill 'sx_table'. |
|
* |
|
* The original driver used to rely on a fixed sx_table, containing periods |
|
* for (only) the lower limits of the respective input-clock-frequency ranges |
|
* (8-10/12-15/16-20 MHz). Although it seems, that no problems occurred with |
|
* this setting so far, it might be desirable to adjust the transfer periods |
|
* closer to the really attached, possibly 25% higher, input-clock, since |
|
* - the wd33c93 may really use a significant shorter period, than it has |
|
* negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz |
|
* instead). |
|
* - the wd33c93 may ask the target for a lower transfer rate, than the target |
|
* is capable of (eg. negotiating for an assumed minimum of 252ns instead of |
|
* possible 200ns, which indeed shows up in tests as an approx. 10% lower |
|
* transfer rate). |
|
*/ |
|
static inline unsigned int |
|
round_4(unsigned int x) |
|
{ |
|
switch (x & 3) { |
|
case 1: --x; |
|
break; |
|
case 2: ++x; |
|
fallthrough; |
|
case 3: ++x; |
|
} |
|
return x; |
|
} |
|
|
|
static void |
|
calc_sx_table(unsigned int mhz, struct sx_period sx_table[9]) |
|
{ |
|
unsigned int d, i; |
|
if (mhz < 11) |
|
d = 2; /* divisor for 8-10 MHz input-clock */ |
|
else if (mhz < 16) |
|
d = 3; /* divisor for 12-15 MHz input-clock */ |
|
else |
|
d = 4; /* divisor for 16-20 MHz input-clock */ |
|
|
|
d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */ |
|
|
|
sx_table[0].period_ns = 1; |
|
sx_table[0].reg_value = 0x20; |
|
for (i = 1; i < 8; i++) { |
|
sx_table[i].period_ns = round_4((i+1)*d / 100); |
|
sx_table[i].reg_value = (i+1)*0x10; |
|
} |
|
sx_table[7].reg_value = 0; |
|
sx_table[8].period_ns = 0; |
|
sx_table[8].reg_value = 0; |
|
} |
|
|
|
/* |
|
* check and, maybe, map an init- or "clock:"- argument. |
|
*/ |
|
static uchar |
|
set_clk_freq(int freq, int *mhz) |
|
{ |
|
int x = freq; |
|
if (WD33C93_FS_8_10 == freq) |
|
freq = 8; |
|
else if (WD33C93_FS_12_15 == freq) |
|
freq = 12; |
|
else if (WD33C93_FS_16_20 == freq) |
|
freq = 16; |
|
else if (freq > 7 && freq < 11) |
|
x = WD33C93_FS_8_10; |
|
else if (freq > 11 && freq < 16) |
|
x = WD33C93_FS_12_15; |
|
else if (freq > 15 && freq < 21) |
|
x = WD33C93_FS_16_20; |
|
else { |
|
/* Hmm, wouldn't it be safer to assume highest freq here? */ |
|
x = WD33C93_FS_8_10; |
|
freq = 8; |
|
} |
|
*mhz = freq; |
|
return x; |
|
} |
|
|
|
/* |
|
* to be used with the resync: fast: ... options |
|
*/ |
|
static inline void set_resync ( struct WD33C93_hostdata *hd, int mask ) |
|
{ |
|
int i; |
|
for (i = 0; i < 8; i++) |
|
if (mask & (1 << i)) |
|
hd->sync_stat[i] = SS_UNSET; |
|
} |
|
|
|
void |
|
wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs, |
|
dma_setup_t setup, dma_stop_t stop, int clock_freq) |
|
{ |
|
struct WD33C93_hostdata *hostdata; |
|
int i; |
|
int flags; |
|
int val; |
|
char buf[32]; |
|
|
|
if (!done_setup && setup_strings) |
|
wd33c93_setup(setup_strings); |
|
|
|
hostdata = (struct WD33C93_hostdata *) instance->hostdata; |
|
|
|
hostdata->regs = regs; |
|
hostdata->clock_freq = set_clk_freq(clock_freq, &i); |
|
calc_sx_table(i, hostdata->sx_table); |
|
hostdata->dma_setup = setup; |
|
hostdata->dma_stop = stop; |
|
hostdata->dma_bounce_buffer = NULL; |
|
hostdata->dma_bounce_len = 0; |
|
for (i = 0; i < 8; i++) { |
|
hostdata->busy[i] = 0; |
|
hostdata->sync_xfer[i] = |
|
calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF, |
|
0, hostdata->sx_table); |
|
hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */ |
|
#ifdef PROC_STATISTICS |
|
hostdata->cmd_cnt[i] = 0; |
|
hostdata->disc_allowed_cnt[i] = 0; |
|
hostdata->disc_done_cnt[i] = 0; |
|
#endif |
|
} |
|
hostdata->input_Q = NULL; |
|
hostdata->selecting = NULL; |
|
hostdata->connected = NULL; |
|
hostdata->disconnected_Q = NULL; |
|
hostdata->state = S_UNCONNECTED; |
|
hostdata->dma = D_DMA_OFF; |
|
hostdata->level2 = L2_BASIC; |
|
hostdata->disconnect = DIS_ADAPTIVE; |
|
hostdata->args = DEBUG_DEFAULTS; |
|
hostdata->incoming_ptr = 0; |
|
hostdata->outgoing_len = 0; |
|
hostdata->default_sx_per = DEFAULT_SX_PER; |
|
hostdata->no_dma = 0; /* default is DMA enabled */ |
|
|
|
#ifdef PROC_INTERFACE |
|
hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS | |
|
PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP; |
|
#ifdef PROC_STATISTICS |
|
hostdata->dma_cnt = 0; |
|
hostdata->pio_cnt = 0; |
|
hostdata->int_cnt = 0; |
|
#endif |
|
#endif |
|
|
|
if (check_setup_args("clock", &flags, &val, buf)) { |
|
hostdata->clock_freq = set_clk_freq(val, &val); |
|
calc_sx_table(val, hostdata->sx_table); |
|
} |
|
|
|
if (check_setup_args("nosync", &flags, &val, buf)) |
|
hostdata->no_sync = val; |
|
|
|
if (check_setup_args("nodma", &flags, &val, buf)) |
|
hostdata->no_dma = (val == -1) ? 1 : val; |
|
|
|
if (check_setup_args("period", &flags, &val, buf)) |
|
hostdata->default_sx_per = |
|
hostdata->sx_table[round_period((unsigned int) val, |
|
hostdata->sx_table)].period_ns; |
|
|
|
if (check_setup_args("disconnect", &flags, &val, buf)) { |
|
if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS)) |
|
hostdata->disconnect = val; |
|
else |
|
hostdata->disconnect = DIS_ADAPTIVE; |
|
} |
|
|
|
if (check_setup_args("level2", &flags, &val, buf)) |
|
hostdata->level2 = val; |
|
|
|
if (check_setup_args("debug", &flags, &val, buf)) |
|
hostdata->args = val & DB_MASK; |
|
|
|
if (check_setup_args("burst", &flags, &val, buf)) |
|
hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA; |
|
|
|
if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */ |
|
&& check_setup_args("fast", &flags, &val, buf)) |
|
hostdata->fast = !!val; |
|
|
|
if ((i = check_setup_args("next", &flags, &val, buf))) { |
|
while (i) |
|
setup_used[--i] = 1; |
|
} |
|
#ifdef PROC_INTERFACE |
|
if (check_setup_args("proc", &flags, &val, buf)) |
|
hostdata->proc = val; |
|
#endif |
|
|
|
spin_lock_irq(&hostdata->lock); |
|
reset_wd33c93(instance); |
|
spin_unlock_irq(&hostdata->lock); |
|
|
|
printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d", |
|
instance->host_no, |
|
(hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip == |
|
C_WD33C93A) ? |
|
"WD33c93A" : (hostdata->chip == |
|
C_WD33C93B) ? "WD33c93B" : "unknown", |
|
hostdata->microcode, hostdata->no_sync, hostdata->no_dma); |
|
#ifdef DEBUGGING_ON |
|
printk(" debug_flags=0x%02x\n", hostdata->args); |
|
#else |
|
printk(" debugging=OFF\n"); |
|
#endif |
|
printk(" setup_args="); |
|
for (i = 0; i < MAX_SETUP_ARGS; i++) |
|
printk("%s,", setup_args[i]); |
|
printk("\n"); |
|
printk(" Version %s - %s\n", WD33C93_VERSION, WD33C93_DATE); |
|
} |
|
|
|
int wd33c93_write_info(struct Scsi_Host *instance, char *buf, int len) |
|
{ |
|
#ifdef PROC_INTERFACE |
|
char *bp; |
|
struct WD33C93_hostdata *hd; |
|
int x; |
|
|
|
hd = (struct WD33C93_hostdata *) instance->hostdata; |
|
|
|
/* We accept the following |
|
* keywords (same format as command-line, but arguments are not optional): |
|
* debug |
|
* disconnect |
|
* period |
|
* resync |
|
* proc |
|
* nodma |
|
* level2 |
|
* burst |
|
* fast |
|
* nosync |
|
*/ |
|
|
|
buf[len] = '\0'; |
|
for (bp = buf; *bp; ) { |
|
while (',' == *bp || ' ' == *bp) |
|
++bp; |
|
if (!strncmp(bp, "debug:", 6)) { |
|
hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK; |
|
} else if (!strncmp(bp, "disconnect:", 11)) { |
|
x = simple_strtoul(bp+11, &bp, 0); |
|
if (x < DIS_NEVER || x > DIS_ALWAYS) |
|
x = DIS_ADAPTIVE; |
|
hd->disconnect = x; |
|
} else if (!strncmp(bp, "period:", 7)) { |
|
x = simple_strtoul(bp+7, &bp, 0); |
|
hd->default_sx_per = |
|
hd->sx_table[round_period((unsigned int) x, |
|
hd->sx_table)].period_ns; |
|
} else if (!strncmp(bp, "resync:", 7)) { |
|
set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0)); |
|
} else if (!strncmp(bp, "proc:", 5)) { |
|
hd->proc = simple_strtoul(bp+5, &bp, 0); |
|
} else if (!strncmp(bp, "nodma:", 6)) { |
|
hd->no_dma = simple_strtoul(bp+6, &bp, 0); |
|
} else if (!strncmp(bp, "level2:", 7)) { |
|
hd->level2 = simple_strtoul(bp+7, &bp, 0); |
|
} else if (!strncmp(bp, "burst:", 6)) { |
|
hd->dma_mode = |
|
simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA; |
|
} else if (!strncmp(bp, "fast:", 5)) { |
|
x = !!simple_strtol(bp+5, &bp, 0); |
|
if (x != hd->fast) |
|
set_resync(hd, 0xff); |
|
hd->fast = x; |
|
} else if (!strncmp(bp, "nosync:", 7)) { |
|
x = simple_strtoul(bp+7, &bp, 0); |
|
set_resync(hd, x ^ hd->no_sync); |
|
hd->no_sync = x; |
|
} else { |
|
break; /* unknown keyword,syntax-error,... */ |
|
} |
|
} |
|
return len; |
|
#else |
|
return 0; |
|
#endif |
|
} |
|
|
|
int |
|
wd33c93_show_info(struct seq_file *m, struct Scsi_Host *instance) |
|
{ |
|
#ifdef PROC_INTERFACE |
|
struct WD33C93_hostdata *hd; |
|
struct scsi_cmnd *cmd; |
|
int x; |
|
|
|
hd = (struct WD33C93_hostdata *) instance->hostdata; |
|
|
|
spin_lock_irq(&hd->lock); |
|
if (hd->proc & PR_VERSION) |
|
seq_printf(m, "\nVersion %s - %s.", |
|
WD33C93_VERSION, WD33C93_DATE); |
|
|
|
if (hd->proc & PR_INFO) { |
|
seq_printf(m, "\nclock_freq=%02x no_sync=%02x no_dma=%d" |
|
" dma_mode=%02x fast=%d", |
|
hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast); |
|
seq_puts(m, "\nsync_xfer[] = "); |
|
for (x = 0; x < 7; x++) |
|
seq_printf(m, "\t%02x", hd->sync_xfer[x]); |
|
seq_puts(m, "\nsync_stat[] = "); |
|
for (x = 0; x < 7; x++) |
|
seq_printf(m, "\t%02x", hd->sync_stat[x]); |
|
} |
|
#ifdef PROC_STATISTICS |
|
if (hd->proc & PR_STATISTICS) { |
|
seq_puts(m, "\ncommands issued: "); |
|
for (x = 0; x < 7; x++) |
|
seq_printf(m, "\t%ld", hd->cmd_cnt[x]); |
|
seq_puts(m, "\ndisconnects allowed:"); |
|
for (x = 0; x < 7; x++) |
|
seq_printf(m, "\t%ld", hd->disc_allowed_cnt[x]); |
|
seq_puts(m, "\ndisconnects done: "); |
|
for (x = 0; x < 7; x++) |
|
seq_printf(m, "\t%ld", hd->disc_done_cnt[x]); |
|
seq_printf(m, |
|
"\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO", |
|
hd->int_cnt, hd->dma_cnt, hd->pio_cnt); |
|
} |
|
#endif |
|
if (hd->proc & PR_CONNECTED) { |
|
seq_puts(m, "\nconnected: "); |
|
if (hd->connected) { |
|
cmd = (struct scsi_cmnd *) hd->connected; |
|
seq_printf(m, " %d:%llu(%02x)", |
|
cmd->device->id, cmd->device->lun, cmd->cmnd[0]); |
|
} |
|
} |
|
if (hd->proc & PR_INPUTQ) { |
|
seq_puts(m, "\ninput_Q: "); |
|
cmd = (struct scsi_cmnd *) hd->input_Q; |
|
while (cmd) { |
|
seq_printf(m, " %d:%llu(%02x)", |
|
cmd->device->id, cmd->device->lun, cmd->cmnd[0]); |
|
cmd = (struct scsi_cmnd *) cmd->host_scribble; |
|
} |
|
} |
|
if (hd->proc & PR_DISCQ) { |
|
seq_puts(m, "\ndisconnected_Q:"); |
|
cmd = (struct scsi_cmnd *) hd->disconnected_Q; |
|
while (cmd) { |
|
seq_printf(m, " %d:%llu(%02x)", |
|
cmd->device->id, cmd->device->lun, cmd->cmnd[0]); |
|
cmd = (struct scsi_cmnd *) cmd->host_scribble; |
|
} |
|
} |
|
seq_putc(m, '\n'); |
|
spin_unlock_irq(&hd->lock); |
|
#endif /* PROC_INTERFACE */ |
|
return 0; |
|
} |
|
|
|
EXPORT_SYMBOL(wd33c93_host_reset); |
|
EXPORT_SYMBOL(wd33c93_init); |
|
EXPORT_SYMBOL(wd33c93_abort); |
|
EXPORT_SYMBOL(wd33c93_queuecommand); |
|
EXPORT_SYMBOL(wd33c93_intr); |
|
EXPORT_SYMBOL(wd33c93_show_info); |
|
EXPORT_SYMBOL(wd33c93_write_info);
|
|
|