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2121 lines
67 KiB
2121 lines
67 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* NCR (or Symbios) 53c700 and 53c700-66 Driver |
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* |
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* Copyright (C) 2001 by [email protected] |
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**----------------------------------------------------------------------------- |
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** |
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** |
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**----------------------------------------------------------------------------- |
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*/ |
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|
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/* Notes: |
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* |
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* This driver is designed exclusively for these chips (virtually the |
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* earliest of the scripts engine chips). They need their own drivers |
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* because they are missing so many of the scripts and snazzy register |
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* features of their elder brothers (the 710, 720 and 770). |
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* |
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* The 700 is the lowliest of the line, it can only do async SCSI. |
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* The 700-66 can at least do synchronous SCSI up to 10MHz. |
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* |
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* The 700 chip has no host bus interface logic of its own. However, |
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* it is usually mapped to a location with well defined register |
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* offsets. Therefore, if you can determine the base address and the |
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* irq your board incorporating this chip uses, you can probably use |
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* this driver to run it (although you'll probably have to write a |
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* minimal wrapper for the purpose---see the NCR_D700 driver for |
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* details about how to do this). |
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* |
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* |
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* TODO List: |
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* |
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* 1. Better statistics in the proc fs |
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* |
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* 2. Implement message queue (queues SCSI messages like commands) and make |
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* the abort and device reset functions use them. |
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* */ |
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|
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/* CHANGELOG |
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* |
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* Version 2.8 |
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* |
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* Fixed bad bug affecting tag starvation processing (previously the |
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* driver would hang the system if too many tags starved. Also fixed |
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* bad bug having to do with 10 byte command processing and REQUEST |
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* SENSE (the command would loop forever getting a transfer length |
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* mismatch in the CMD phase). |
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* |
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* Version 2.7 |
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* |
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* Fixed scripts problem which caused certain devices (notably CDRWs) |
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* to hang on initial INQUIRY. Updated NCR_700_readl/writel to use |
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* __raw_readl/writel for parisc compatibility (Thomas |
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* Bogendoerfer). Added missing SCp->request_bufflen initialisation |
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* for sense requests (Ryan Bradetich). |
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* |
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* Version 2.6 |
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* |
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* Following test of the 64 bit parisc kernel by Richard Hirst, |
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* several problems have now been corrected. Also adds support for |
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* consistent memory allocation. |
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* |
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* Version 2.5 |
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* |
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* More Compatibility changes for 710 (now actually works). Enhanced |
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* support for odd clock speeds which constrain SDTR negotiations. |
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* correct cacheline separation for scsi messages and status for |
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* incoherent architectures. Use of the pci mapping functions on |
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* buffers to begin support for 64 bit drivers. |
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* |
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* Version 2.4 |
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* |
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* Added support for the 53c710 chip (in 53c700 emulation mode only---no |
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* special 53c710 instructions or registers are used). |
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* |
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* Version 2.3 |
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* |
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* More endianness/cache coherency changes. |
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* |
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* Better bad device handling (handles devices lying about tag |
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* queueing support and devices which fail to provide sense data on |
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* contingent allegiance conditions) |
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* |
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* Many thanks to Richard Hirst <[email protected]> for patiently |
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* debugging this driver on the parisc architecture and suggesting |
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* many improvements and bug fixes. |
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* |
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* Thanks also go to Linuxcare Inc. for providing several PARISC |
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* machines for me to debug the driver on. |
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* |
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* Version 2.2 |
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* |
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* Made the driver mem or io mapped; added endian invariance; added |
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* dma cache flushing operations for architectures which need it; |
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* added support for more varied clocking speeds. |
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* |
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* Version 2.1 |
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* |
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* Initial modularisation from the D700. See NCR_D700.c for the rest of |
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* the changelog. |
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* */ |
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#define NCR_700_VERSION "2.8" |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/slab.h> |
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#include <linux/ioport.h> |
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#include <linux/delay.h> |
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#include <linux/spinlock.h> |
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#include <linux/completion.h> |
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#include <linux/init.h> |
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#include <linux/proc_fs.h> |
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#include <linux/blkdev.h> |
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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/device.h> |
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#include <linux/pgtable.h> |
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#include <asm/dma.h> |
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#include <asm/io.h> |
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#include <asm/byteorder.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_dbg.h> |
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#include <scsi/scsi_eh.h> |
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#include <scsi/scsi_host.h> |
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#include <scsi/scsi_tcq.h> |
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#include <scsi/scsi_transport.h> |
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#include <scsi/scsi_transport_spi.h> |
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#include "53c700.h" |
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/* NOTE: For 64 bit drivers there are points in the code where we use |
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* a non dereferenceable pointer to point to a structure in dma-able |
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* memory (which is 32 bits) so that we can use all of the structure |
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* operations but take the address at the end. This macro allows us |
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* to truncate the 64 bit pointer down to 32 bits without the compiler |
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* complaining */ |
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#define to32bit(x) ((__u32)((unsigned long)(x))) |
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#ifdef NCR_700_DEBUG |
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#define STATIC |
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#else |
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#define STATIC static |
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#endif |
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MODULE_AUTHOR("James Bottomley"); |
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MODULE_DESCRIPTION("53c700 and 53c700-66 Driver"); |
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MODULE_LICENSE("GPL"); |
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/* This is the script */ |
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#include "53c700_d.h" |
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STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *); |
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STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt); |
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STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt); |
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STATIC void NCR_700_chip_setup(struct Scsi_Host *host); |
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STATIC void NCR_700_chip_reset(struct Scsi_Host *host); |
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STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt); |
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STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt); |
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STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt); |
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static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth); |
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STATIC struct device_attribute *NCR_700_dev_attrs[]; |
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STATIC struct scsi_transport_template *NCR_700_transport_template = NULL; |
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static char *NCR_700_phase[] = { |
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"", |
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"after selection", |
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"before command phase", |
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"after command phase", |
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"after status phase", |
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"after data in phase", |
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"after data out phase", |
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"during data phase", |
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}; |
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static char *NCR_700_condition[] = { |
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"", |
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"NOT MSG_OUT", |
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"UNEXPECTED PHASE", |
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"NOT MSG_IN", |
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"UNEXPECTED MSG", |
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"MSG_IN", |
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"SDTR_MSG RECEIVED", |
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"REJECT_MSG RECEIVED", |
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"DISCONNECT_MSG RECEIVED", |
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"MSG_OUT", |
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"DATA_IN", |
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}; |
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static char *NCR_700_fatal_messages[] = { |
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"unexpected message after reselection", |
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"still MSG_OUT after message injection", |
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"not MSG_IN after selection", |
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"Illegal message length received", |
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}; |
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static char *NCR_700_SBCL_bits[] = { |
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"IO ", |
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"CD ", |
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"MSG ", |
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"ATN ", |
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"SEL ", |
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"BSY ", |
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"ACK ", |
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"REQ ", |
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}; |
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static char *NCR_700_SBCL_to_phase[] = { |
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"DATA_OUT", |
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"DATA_IN", |
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"CMD_OUT", |
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"STATE", |
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"ILLEGAL PHASE", |
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"ILLEGAL PHASE", |
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"MSG OUT", |
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"MSG IN", |
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}; |
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/* This translates the SDTR message offset and period to a value |
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* which can be loaded into the SXFER_REG. |
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* |
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* NOTE: According to SCSI-2, the true transfer period (in ns) is |
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* actually four times this period value */ |
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static inline __u8 |
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NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata, |
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__u8 offset, __u8 period) |
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{ |
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int XFERP; |
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__u8 min_xferp = (hostdata->chip710 |
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? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP); |
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__u8 max_offset = (hostdata->chip710 |
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? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET); |
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if(offset == 0) |
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return 0; |
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if(period < hostdata->min_period) { |
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printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4); |
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period = hostdata->min_period; |
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} |
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XFERP = (period*4 * hostdata->sync_clock)/1000 - 4; |
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if(offset > max_offset) { |
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printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n", |
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offset, max_offset); |
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offset = max_offset; |
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} |
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if(XFERP < min_xferp) { |
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XFERP = min_xferp; |
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} |
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return (offset & 0x0f) | (XFERP & 0x07)<<4; |
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} |
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static inline __u8 |
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NCR_700_get_SXFER(struct scsi_device *SDp) |
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{ |
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struct NCR_700_Host_Parameters *hostdata = |
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(struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; |
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return NCR_700_offset_period_to_sxfer(hostdata, |
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spi_offset(SDp->sdev_target), |
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spi_period(SDp->sdev_target)); |
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} |
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static inline dma_addr_t virt_to_dma(struct NCR_700_Host_Parameters *h, void *p) |
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{ |
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return h->pScript + ((uintptr_t)p - (uintptr_t)h->script); |
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} |
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static inline void dma_sync_to_dev(struct NCR_700_Host_Parameters *h, |
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void *addr, size_t size) |
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{ |
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if (h->noncoherent) |
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dma_sync_single_for_device(h->dev, virt_to_dma(h, addr), |
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size, DMA_BIDIRECTIONAL); |
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} |
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static inline void dma_sync_from_dev(struct NCR_700_Host_Parameters *h, |
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void *addr, size_t size) |
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{ |
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if (h->noncoherent) |
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dma_sync_single_for_device(h->dev, virt_to_dma(h, addr), size, |
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DMA_BIDIRECTIONAL); |
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} |
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struct Scsi_Host * |
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NCR_700_detect(struct scsi_host_template *tpnt, |
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struct NCR_700_Host_Parameters *hostdata, struct device *dev) |
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{ |
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dma_addr_t pScript, pSlots; |
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__u8 *memory; |
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__u32 *script; |
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struct Scsi_Host *host; |
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static int banner = 0; |
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int j; |
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if(tpnt->sdev_attrs == NULL) |
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tpnt->sdev_attrs = NCR_700_dev_attrs; |
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memory = dma_alloc_coherent(dev, TOTAL_MEM_SIZE, &pScript, GFP_KERNEL); |
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if (!memory) { |
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hostdata->noncoherent = 1; |
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memory = dma_alloc_noncoherent(dev, TOTAL_MEM_SIZE, &pScript, |
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DMA_BIDIRECTIONAL, GFP_KERNEL); |
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} |
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if (!memory) { |
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printk(KERN_ERR "53c700: Failed to allocate memory for driver, detaching\n"); |
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return NULL; |
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} |
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script = (__u32 *)memory; |
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hostdata->msgin = memory + MSGIN_OFFSET; |
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hostdata->msgout = memory + MSGOUT_OFFSET; |
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hostdata->status = memory + STATUS_OFFSET; |
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hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET); |
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hostdata->dev = dev; |
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pSlots = pScript + SLOTS_OFFSET; |
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/* Fill in the missing routines from the host template */ |
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tpnt->queuecommand = NCR_700_queuecommand; |
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tpnt->eh_abort_handler = NCR_700_abort; |
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tpnt->eh_host_reset_handler = NCR_700_host_reset; |
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tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST; |
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tpnt->sg_tablesize = NCR_700_SG_SEGMENTS; |
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tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN; |
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tpnt->slave_configure = NCR_700_slave_configure; |
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tpnt->slave_destroy = NCR_700_slave_destroy; |
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tpnt->slave_alloc = NCR_700_slave_alloc; |
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tpnt->change_queue_depth = NCR_700_change_queue_depth; |
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if(tpnt->name == NULL) |
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tpnt->name = "53c700"; |
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if(tpnt->proc_name == NULL) |
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tpnt->proc_name = "53c700"; |
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host = scsi_host_alloc(tpnt, 4); |
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if (!host) |
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return NULL; |
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memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot) |
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* NCR_700_COMMAND_SLOTS_PER_HOST); |
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for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) { |
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dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0] |
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- (unsigned long)&hostdata->slots[0].SG[0]); |
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hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset)); |
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if(j == 0) |
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hostdata->free_list = &hostdata->slots[j]; |
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else |
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hostdata->slots[j-1].ITL_forw = &hostdata->slots[j]; |
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hostdata->slots[j].state = NCR_700_SLOT_FREE; |
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} |
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for (j = 0; j < ARRAY_SIZE(SCRIPT); j++) |
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script[j] = bS_to_host(SCRIPT[j]); |
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|
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/* adjust all labels to be bus physical */ |
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for (j = 0; j < PATCHES; j++) |
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script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]); |
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/* now patch up fixed addresses. */ |
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script_patch_32(hostdata, script, MessageLocation, |
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pScript + MSGOUT_OFFSET); |
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script_patch_32(hostdata, script, StatusAddress, |
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pScript + STATUS_OFFSET); |
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script_patch_32(hostdata, script, ReceiveMsgAddress, |
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pScript + MSGIN_OFFSET); |
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hostdata->script = script; |
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hostdata->pScript = pScript; |
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dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE); |
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hostdata->state = NCR_700_HOST_FREE; |
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hostdata->cmd = NULL; |
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host->max_id = 8; |
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host->max_lun = NCR_700_MAX_LUNS; |
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BUG_ON(NCR_700_transport_template == NULL); |
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host->transportt = NCR_700_transport_template; |
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host->unique_id = (unsigned long)hostdata->base; |
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hostdata->eh_complete = NULL; |
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host->hostdata[0] = (unsigned long)hostdata; |
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/* kick the chip */ |
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NCR_700_writeb(0xff, host, CTEST9_REG); |
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if (hostdata->chip710) |
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hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f; |
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else |
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hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f; |
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hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0); |
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if (banner == 0) { |
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printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By [email protected]\n"); |
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banner = 1; |
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} |
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printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no, |
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hostdata->chip710 ? "53c710" : |
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(hostdata->fast ? "53c700-66" : "53c700"), |
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hostdata->rev, hostdata->differential ? |
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"(Differential)" : ""); |
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/* reset the chip */ |
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NCR_700_chip_reset(host); |
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|
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if (scsi_add_host(host, dev)) { |
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dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n"); |
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scsi_host_put(host); |
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return NULL; |
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} |
|
|
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spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD : |
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SPI_SIGNAL_SE; |
|
|
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return host; |
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} |
|
|
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int |
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NCR_700_release(struct Scsi_Host *host) |
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{ |
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struct NCR_700_Host_Parameters *hostdata = |
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(struct NCR_700_Host_Parameters *)host->hostdata[0]; |
|
|
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if (hostdata->noncoherent) |
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dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE, |
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hostdata->script, hostdata->pScript, |
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DMA_BIDIRECTIONAL); |
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else |
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dma_free_coherent(hostdata->dev, TOTAL_MEM_SIZE, |
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hostdata->script, hostdata->pScript); |
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return 1; |
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} |
|
|
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static inline __u8 |
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NCR_700_identify(int can_disconnect, __u8 lun) |
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{ |
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return IDENTIFY_BASE | |
|
((can_disconnect) ? 0x40 : 0) | |
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(lun & NCR_700_LUN_MASK); |
|
} |
|
|
|
/* |
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* Function : static int data_residual (Scsi_Host *host) |
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* |
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* Purpose : return residual data count of what's in the chip. If you |
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* really want to know what this function is doing, it's almost a |
|
* direct transcription of the algorithm described in the 53c710 |
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* guide, except that the DBC and DFIFO registers are only 6 bits |
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* wide on a 53c700. |
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* |
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* Inputs : host - SCSI host */ |
|
static inline int |
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NCR_700_data_residual (struct Scsi_Host *host) { |
|
struct NCR_700_Host_Parameters *hostdata = |
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(struct NCR_700_Host_Parameters *)host->hostdata[0]; |
|
int count, synchronous = 0; |
|
unsigned int ddir; |
|
|
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if(hostdata->chip710) { |
|
count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) - |
|
(NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f; |
|
} else { |
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count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) - |
|
(NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f; |
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} |
|
|
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if(hostdata->fast) |
|
synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f; |
|
|
|
/* get the data direction */ |
|
ddir = NCR_700_readb(host, CTEST0_REG) & 0x01; |
|
|
|
if (ddir) { |
|
/* Receive */ |
|
if (synchronous) |
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count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4; |
|
else |
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if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL) |
|
++count; |
|
} else { |
|
/* Send */ |
|
__u8 sstat = NCR_700_readb(host, SSTAT1_REG); |
|
if (sstat & SODL_REG_FULL) |
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++count; |
|
if (synchronous && (sstat & SODR_REG_FULL)) |
|
++count; |
|
} |
|
#ifdef NCR_700_DEBUG |
|
if(count) |
|
printk("RESIDUAL IS %d (ddir %d)\n", count, ddir); |
|
#endif |
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return count; |
|
} |
|
|
|
/* print out the SCSI wires and corresponding phase from the SBCL register |
|
* in the chip */ |
|
static inline char * |
|
sbcl_to_string(__u8 sbcl) |
|
{ |
|
int i; |
|
static char ret[256]; |
|
|
|
ret[0]='\0'; |
|
for(i=0; i<8; i++) { |
|
if((1<<i) & sbcl) |
|
strcat(ret, NCR_700_SBCL_bits[i]); |
|
} |
|
strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]); |
|
return ret; |
|
} |
|
|
|
static inline __u8 |
|
bitmap_to_number(__u8 bitmap) |
|
{ |
|
__u8 i; |
|
|
|
for(i=0; i<8 && !(bitmap &(1<<i)); i++) |
|
; |
|
return i; |
|
} |
|
|
|
/* Pull a slot off the free list */ |
|
STATIC struct NCR_700_command_slot * |
|
find_empty_slot(struct NCR_700_Host_Parameters *hostdata) |
|
{ |
|
struct NCR_700_command_slot *slot = hostdata->free_list; |
|
|
|
if(slot == NULL) { |
|
/* sanity check */ |
|
if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST) |
|
printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST); |
|
return NULL; |
|
} |
|
|
|
if(slot->state != NCR_700_SLOT_FREE) |
|
/* should panic! */ |
|
printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n"); |
|
|
|
|
|
hostdata->free_list = slot->ITL_forw; |
|
slot->ITL_forw = NULL; |
|
|
|
|
|
/* NOTE: set the state to busy here, not queued, since this |
|
* indicates the slot is in use and cannot be run by the IRQ |
|
* finish routine. If we cannot queue the command when it |
|
* is properly build, we then change to NCR_700_SLOT_QUEUED */ |
|
slot->state = NCR_700_SLOT_BUSY; |
|
slot->flags = 0; |
|
hostdata->command_slot_count++; |
|
|
|
return slot; |
|
} |
|
|
|
STATIC void |
|
free_slot(struct NCR_700_command_slot *slot, |
|
struct NCR_700_Host_Parameters *hostdata) |
|
{ |
|
if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) { |
|
printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot); |
|
} |
|
if(slot->state == NCR_700_SLOT_FREE) { |
|
printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot); |
|
} |
|
|
|
slot->resume_offset = 0; |
|
slot->cmnd = NULL; |
|
slot->state = NCR_700_SLOT_FREE; |
|
slot->ITL_forw = hostdata->free_list; |
|
hostdata->free_list = slot; |
|
hostdata->command_slot_count--; |
|
} |
|
|
|
|
|
/* This routine really does very little. The command is indexed on |
|
the ITL and (if tagged) the ITLQ lists in _queuecommand */ |
|
STATIC void |
|
save_for_reselection(struct NCR_700_Host_Parameters *hostdata, |
|
struct scsi_cmnd *SCp, __u32 dsp) |
|
{ |
|
/* Its just possible that this gets executed twice */ |
|
if(SCp != NULL) { |
|
struct NCR_700_command_slot *slot = |
|
(struct NCR_700_command_slot *)SCp->host_scribble; |
|
|
|
slot->resume_offset = dsp; |
|
} |
|
hostdata->state = NCR_700_HOST_FREE; |
|
hostdata->cmd = NULL; |
|
} |
|
|
|
STATIC inline void |
|
NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp, |
|
struct NCR_700_command_slot *slot) |
|
{ |
|
if(SCp->sc_data_direction != DMA_NONE && |
|
SCp->sc_data_direction != DMA_BIDIRECTIONAL) |
|
scsi_dma_unmap(SCp); |
|
} |
|
|
|
STATIC inline void |
|
NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata, |
|
struct scsi_cmnd *SCp, int result) |
|
{ |
|
hostdata->state = NCR_700_HOST_FREE; |
|
hostdata->cmd = NULL; |
|
|
|
if(SCp != NULL) { |
|
struct NCR_700_command_slot *slot = |
|
(struct NCR_700_command_slot *)SCp->host_scribble; |
|
|
|
dma_unmap_single(hostdata->dev, slot->pCmd, |
|
MAX_COMMAND_SIZE, DMA_TO_DEVICE); |
|
if (slot->flags == NCR_700_FLAG_AUTOSENSE) { |
|
char *cmnd = NCR_700_get_sense_cmnd(SCp->device); |
|
|
|
dma_unmap_single(hostdata->dev, slot->dma_handle, |
|
SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); |
|
/* restore the old result if the request sense was |
|
* successful */ |
|
if (result == 0) |
|
result = cmnd[7]; |
|
/* restore the original length */ |
|
SCp->cmd_len = cmnd[8]; |
|
} else |
|
NCR_700_unmap(hostdata, SCp, slot); |
|
|
|
free_slot(slot, hostdata); |
|
#ifdef NCR_700_DEBUG |
|
if(NCR_700_get_depth(SCp->device) == 0 || |
|
NCR_700_get_depth(SCp->device) > SCp->device->queue_depth) |
|
printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n", |
|
NCR_700_get_depth(SCp->device)); |
|
#endif /* NCR_700_DEBUG */ |
|
NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1); |
|
|
|
SCp->host_scribble = NULL; |
|
SCp->result = result; |
|
SCp->scsi_done(SCp); |
|
} else { |
|
printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n"); |
|
} |
|
} |
|
|
|
|
|
STATIC void |
|
NCR_700_internal_bus_reset(struct Scsi_Host *host) |
|
{ |
|
/* Bus reset */ |
|
NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG); |
|
udelay(50); |
|
NCR_700_writeb(0, host, SCNTL1_REG); |
|
|
|
} |
|
|
|
STATIC void |
|
NCR_700_chip_setup(struct Scsi_Host *host) |
|
{ |
|
struct NCR_700_Host_Parameters *hostdata = |
|
(struct NCR_700_Host_Parameters *)host->hostdata[0]; |
|
__u8 min_period; |
|
__u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP); |
|
|
|
if(hostdata->chip710) { |
|
__u8 burst_disable = 0; |
|
__u8 burst_length = 0; |
|
|
|
switch (hostdata->burst_length) { |
|
case 1: |
|
burst_length = BURST_LENGTH_1; |
|
break; |
|
case 2: |
|
burst_length = BURST_LENGTH_2; |
|
break; |
|
case 4: |
|
burst_length = BURST_LENGTH_4; |
|
break; |
|
case 8: |
|
burst_length = BURST_LENGTH_8; |
|
break; |
|
default: |
|
burst_disable = BURST_DISABLE; |
|
break; |
|
} |
|
hostdata->dcntl_extra |= COMPAT_700_MODE; |
|
|
|
NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG); |
|
NCR_700_writeb(burst_length | hostdata->dmode_extra, |
|
host, DMODE_710_REG); |
|
NCR_700_writeb(burst_disable | hostdata->ctest7_extra | |
|
(hostdata->differential ? DIFF : 0), |
|
host, CTEST7_REG); |
|
NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG); |
|
NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY |
|
| AUTO_ATN, host, SCNTL0_REG); |
|
} else { |
|
NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra, |
|
host, DMODE_700_REG); |
|
NCR_700_writeb(hostdata->differential ? |
|
DIFF : 0, host, CTEST7_REG); |
|
if(hostdata->fast) { |
|
/* this is for 700-66, does nothing on 700 */ |
|
NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION |
|
| GENERATE_RECEIVE_PARITY, host, |
|
CTEST8_REG); |
|
} else { |
|
NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY |
|
| PARITY | AUTO_ATN, host, SCNTL0_REG); |
|
} |
|
} |
|
|
|
NCR_700_writeb(1 << host->this_id, host, SCID_REG); |
|
NCR_700_writeb(0, host, SBCL_REG); |
|
NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG); |
|
|
|
NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT |
|
| RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG); |
|
|
|
NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG); |
|
NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG); |
|
if(hostdata->clock > 75) { |
|
printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock); |
|
/* do the best we can, but the async clock will be out |
|
* of spec: sync divider 2, async divider 3 */ |
|
DEBUG(("53c700: sync 2 async 3\n")); |
|
NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG); |
|
NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG); |
|
hostdata->sync_clock = hostdata->clock/2; |
|
} else if(hostdata->clock > 50 && hostdata->clock <= 75) { |
|
/* sync divider 1.5, async divider 3 */ |
|
DEBUG(("53c700: sync 1.5 async 3\n")); |
|
NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG); |
|
NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG); |
|
hostdata->sync_clock = hostdata->clock*2; |
|
hostdata->sync_clock /= 3; |
|
|
|
} else if(hostdata->clock > 37 && hostdata->clock <= 50) { |
|
/* sync divider 1, async divider 2 */ |
|
DEBUG(("53c700: sync 1 async 2\n")); |
|
NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); |
|
NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG); |
|
hostdata->sync_clock = hostdata->clock; |
|
} else if(hostdata->clock > 25 && hostdata->clock <=37) { |
|
/* sync divider 1, async divider 1.5 */ |
|
DEBUG(("53c700: sync 1 async 1.5\n")); |
|
NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); |
|
NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG); |
|
hostdata->sync_clock = hostdata->clock; |
|
} else { |
|
DEBUG(("53c700: sync 1 async 1\n")); |
|
NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG); |
|
NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG); |
|
/* sync divider 1, async divider 1 */ |
|
hostdata->sync_clock = hostdata->clock; |
|
} |
|
/* Calculate the actual minimum period that can be supported |
|
* by our synchronous clock speed. See the 710 manual for |
|
* exact details of this calculation which is based on a |
|
* setting of the SXFER register */ |
|
min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock); |
|
hostdata->min_period = NCR_700_MIN_PERIOD; |
|
if(min_period > NCR_700_MIN_PERIOD) |
|
hostdata->min_period = min_period; |
|
} |
|
|
|
STATIC void |
|
NCR_700_chip_reset(struct Scsi_Host *host) |
|
{ |
|
struct NCR_700_Host_Parameters *hostdata = |
|
(struct NCR_700_Host_Parameters *)host->hostdata[0]; |
|
if(hostdata->chip710) { |
|
NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG); |
|
udelay(100); |
|
|
|
NCR_700_writeb(0, host, ISTAT_REG); |
|
} else { |
|
NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG); |
|
udelay(100); |
|
|
|
NCR_700_writeb(0, host, DCNTL_REG); |
|
} |
|
|
|
mdelay(1000); |
|
|
|
NCR_700_chip_setup(host); |
|
} |
|
|
|
/* The heart of the message processing engine is that the instruction |
|
* immediately after the INT is the normal case (and so must be CLEAR |
|
* ACK). If we want to do something else, we call that routine in |
|
* scripts and set temp to be the normal case + 8 (skipping the CLEAR |
|
* ACK) so that the routine returns correctly to resume its activity |
|
* */ |
|
STATIC __u32 |
|
process_extended_message(struct Scsi_Host *host, |
|
struct NCR_700_Host_Parameters *hostdata, |
|
struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps) |
|
{ |
|
__u32 resume_offset = dsp, temp = dsp + 8; |
|
__u8 pun = 0xff, lun = 0xff; |
|
|
|
if(SCp != NULL) { |
|
pun = SCp->device->id; |
|
lun = SCp->device->lun; |
|
} |
|
|
|
switch(hostdata->msgin[2]) { |
|
case A_SDTR_MSG: |
|
if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) { |
|
struct scsi_target *starget = SCp->device->sdev_target; |
|
__u8 period = hostdata->msgin[3]; |
|
__u8 offset = hostdata->msgin[4]; |
|
|
|
if(offset == 0 || period == 0) { |
|
offset = 0; |
|
period = 0; |
|
} |
|
|
|
spi_offset(starget) = offset; |
|
spi_period(starget) = period; |
|
|
|
if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) { |
|
spi_display_xfer_agreement(starget); |
|
NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION); |
|
} |
|
|
|
NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); |
|
NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); |
|
|
|
NCR_700_writeb(NCR_700_get_SXFER(SCp->device), |
|
host, SXFER_REG); |
|
|
|
} else { |
|
/* SDTR message out of the blue, reject it */ |
|
shost_printk(KERN_WARNING, host, |
|
"Unexpected SDTR msg\n"); |
|
hostdata->msgout[0] = A_REJECT_MSG; |
|
dma_sync_to_dev(hostdata, hostdata->msgout, 1); |
|
script_patch_16(hostdata, hostdata->script, |
|
MessageCount, 1); |
|
/* SendMsgOut returns, so set up the return |
|
* address */ |
|
resume_offset = hostdata->pScript + Ent_SendMessageWithATN; |
|
} |
|
break; |
|
|
|
case A_WDTR_MSG: |
|
printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n", |
|
host->host_no, pun, lun); |
|
hostdata->msgout[0] = A_REJECT_MSG; |
|
dma_sync_to_dev(hostdata, hostdata->msgout, 1); |
|
script_patch_16(hostdata, hostdata->script, MessageCount, 1); |
|
resume_offset = hostdata->pScript + Ent_SendMessageWithATN; |
|
|
|
break; |
|
|
|
default: |
|
printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ", |
|
host->host_no, pun, lun, |
|
NCR_700_phase[(dsps & 0xf00) >> 8]); |
|
spi_print_msg(hostdata->msgin); |
|
printk("\n"); |
|
/* just reject it */ |
|
hostdata->msgout[0] = A_REJECT_MSG; |
|
dma_sync_to_dev(hostdata, hostdata->msgout, 1); |
|
script_patch_16(hostdata, hostdata->script, MessageCount, 1); |
|
/* SendMsgOut returns, so set up the return |
|
* address */ |
|
resume_offset = hostdata->pScript + Ent_SendMessageWithATN; |
|
} |
|
NCR_700_writel(temp, host, TEMP_REG); |
|
return resume_offset; |
|
} |
|
|
|
STATIC __u32 |
|
process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata, |
|
struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps) |
|
{ |
|
/* work out where to return to */ |
|
__u32 temp = dsp + 8, resume_offset = dsp; |
|
__u8 pun = 0xff, lun = 0xff; |
|
|
|
if(SCp != NULL) { |
|
pun = SCp->device->id; |
|
lun = SCp->device->lun; |
|
} |
|
|
|
#ifdef NCR_700_DEBUG |
|
printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun, |
|
NCR_700_phase[(dsps & 0xf00) >> 8]); |
|
spi_print_msg(hostdata->msgin); |
|
printk("\n"); |
|
#endif |
|
|
|
switch(hostdata->msgin[0]) { |
|
|
|
case A_EXTENDED_MSG: |
|
resume_offset = process_extended_message(host, hostdata, SCp, |
|
dsp, dsps); |
|
break; |
|
|
|
case A_REJECT_MSG: |
|
if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) { |
|
/* Rejected our sync negotiation attempt */ |
|
spi_period(SCp->device->sdev_target) = |
|
spi_offset(SCp->device->sdev_target) = 0; |
|
NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); |
|
NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); |
|
} else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) { |
|
/* rejected our first simple tag message */ |
|
scmd_printk(KERN_WARNING, SCp, |
|
"Rejected first tag queue attempt, turning off tag queueing\n"); |
|
/* we're done negotiating */ |
|
NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION); |
|
hostdata->tag_negotiated &= ~(1<<scmd_id(SCp)); |
|
|
|
SCp->device->tagged_supported = 0; |
|
SCp->device->simple_tags = 0; |
|
scsi_change_queue_depth(SCp->device, host->cmd_per_lun); |
|
} else { |
|
shost_printk(KERN_WARNING, host, |
|
"(%d:%d) Unexpected REJECT Message %s\n", |
|
pun, lun, |
|
NCR_700_phase[(dsps & 0xf00) >> 8]); |
|
/* however, just ignore it */ |
|
} |
|
break; |
|
|
|
case A_PARITY_ERROR_MSG: |
|
printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no, |
|
pun, lun); |
|
NCR_700_internal_bus_reset(host); |
|
break; |
|
case A_SIMPLE_TAG_MSG: |
|
printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no, |
|
pun, lun, hostdata->msgin[1], |
|
NCR_700_phase[(dsps & 0xf00) >> 8]); |
|
/* just ignore it */ |
|
break; |
|
default: |
|
printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ", |
|
host->host_no, pun, lun, |
|
NCR_700_phase[(dsps & 0xf00) >> 8]); |
|
|
|
spi_print_msg(hostdata->msgin); |
|
printk("\n"); |
|
/* just reject it */ |
|
hostdata->msgout[0] = A_REJECT_MSG; |
|
dma_sync_to_dev(hostdata, hostdata->msgout, 1); |
|
script_patch_16(hostdata, hostdata->script, MessageCount, 1); |
|
/* SendMsgOut returns, so set up the return |
|
* address */ |
|
resume_offset = hostdata->pScript + Ent_SendMessageWithATN; |
|
|
|
break; |
|
} |
|
NCR_700_writel(temp, host, TEMP_REG); |
|
/* set us up to receive another message */ |
|
dma_sync_from_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE); |
|
return resume_offset; |
|
} |
|
|
|
STATIC __u32 |
|
process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp, |
|
struct Scsi_Host *host, |
|
struct NCR_700_Host_Parameters *hostdata) |
|
{ |
|
__u32 resume_offset = 0; |
|
__u8 pun = 0xff, lun=0xff; |
|
|
|
if(SCp != NULL) { |
|
pun = SCp->device->id; |
|
lun = SCp->device->lun; |
|
} |
|
|
|
if(dsps == A_GOOD_STATUS_AFTER_STATUS) { |
|
DEBUG((" COMMAND COMPLETE, status=%02x\n", |
|
hostdata->status[0])); |
|
/* OK, if TCQ still under negotiation, we now know it works */ |
|
if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) |
|
NCR_700_set_tag_neg_state(SCp->device, |
|
NCR_700_FINISHED_TAG_NEGOTIATION); |
|
|
|
/* check for contingent allegiance conditions */ |
|
if (hostdata->status[0] == SAM_STAT_CHECK_CONDITION || |
|
hostdata->status[0] == SAM_STAT_COMMAND_TERMINATED) { |
|
struct NCR_700_command_slot *slot = |
|
(struct NCR_700_command_slot *)SCp->host_scribble; |
|
if(slot->flags == NCR_700_FLAG_AUTOSENSE) { |
|
/* OOPS: bad device, returning another |
|
* contingent allegiance condition */ |
|
scmd_printk(KERN_ERR, SCp, |
|
"broken device is looping in contingent allegiance: ignoring\n"); |
|
NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]); |
|
} else { |
|
char *cmnd = |
|
NCR_700_get_sense_cmnd(SCp->device); |
|
#ifdef NCR_DEBUG |
|
scsi_print_command(SCp); |
|
printk(" cmd %p has status %d, requesting sense\n", |
|
SCp, hostdata->status[0]); |
|
#endif |
|
/* we can destroy the command here |
|
* because the contingent allegiance |
|
* condition will cause a retry which |
|
* will re-copy the command from the |
|
* saved data_cmnd. We also unmap any |
|
* data associated with the command |
|
* here */ |
|
NCR_700_unmap(hostdata, SCp, slot); |
|
dma_unmap_single(hostdata->dev, slot->pCmd, |
|
MAX_COMMAND_SIZE, |
|
DMA_TO_DEVICE); |
|
|
|
cmnd[0] = REQUEST_SENSE; |
|
cmnd[1] = (lun & 0x7) << 5; |
|
cmnd[2] = 0; |
|
cmnd[3] = 0; |
|
cmnd[4] = SCSI_SENSE_BUFFERSIZE; |
|
cmnd[5] = 0; |
|
/* Here's a quiet hack: the |
|
* REQUEST_SENSE command is six bytes, |
|
* so store a flag indicating that |
|
* this was an internal sense request |
|
* and the original status at the end |
|
* of the command */ |
|
cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC; |
|
cmnd[7] = hostdata->status[0]; |
|
cmnd[8] = SCp->cmd_len; |
|
SCp->cmd_len = 6; /* command length for |
|
* REQUEST_SENSE */ |
|
slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE); |
|
slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); |
|
slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE); |
|
slot->SG[0].pAddr = bS_to_host(slot->dma_handle); |
|
slot->SG[1].ins = bS_to_host(SCRIPT_RETURN); |
|
slot->SG[1].pAddr = 0; |
|
slot->resume_offset = hostdata->pScript; |
|
dma_sync_to_dev(hostdata, slot->SG, sizeof(slot->SG[0])*2); |
|
dma_sync_from_dev(hostdata, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE); |
|
|
|
/* queue the command for reissue */ |
|
slot->state = NCR_700_SLOT_QUEUED; |
|
slot->flags = NCR_700_FLAG_AUTOSENSE; |
|
hostdata->state = NCR_700_HOST_FREE; |
|
hostdata->cmd = NULL; |
|
} |
|
} else { |
|
// Currently rely on the mid layer evaluation |
|
// of the tag queuing capability |
|
// |
|
//if(status_byte(hostdata->status[0]) == GOOD && |
|
// SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) { |
|
// /* Piggy back the tag queueing support |
|
// * on this command */ |
|
// dma_sync_single_for_cpu(hostdata->dev, |
|
// slot->dma_handle, |
|
// SCp->request_bufflen, |
|
// DMA_FROM_DEVICE); |
|
// if(((char *)SCp->request_buffer)[7] & 0x02) { |
|
// scmd_printk(KERN_INFO, SCp, |
|
// "Enabling Tag Command Queuing\n"); |
|
// hostdata->tag_negotiated |= (1<<scmd_id(SCp)); |
|
// NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING); |
|
// } else { |
|
// NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING); |
|
// hostdata->tag_negotiated &= ~(1<<scmd_id(SCp)); |
|
// } |
|
//} |
|
NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]); |
|
} |
|
} else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) { |
|
__u8 i = (dsps & 0xf00) >> 8; |
|
|
|
scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n", |
|
NCR_700_phase[i], |
|
sbcl_to_string(NCR_700_readb(host, SBCL_REG))); |
|
scmd_printk(KERN_ERR, SCp, " len = %d, cmd =", |
|
SCp->cmd_len); |
|
scsi_print_command(SCp); |
|
|
|
NCR_700_internal_bus_reset(host); |
|
} else if((dsps & 0xfffff000) == A_FATAL) { |
|
int i = (dsps & 0xfff); |
|
|
|
printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n", |
|
host->host_no, pun, lun, NCR_700_fatal_messages[i]); |
|
if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) { |
|
printk(KERN_ERR " msg begins %02x %02x\n", |
|
hostdata->msgin[0], hostdata->msgin[1]); |
|
} |
|
NCR_700_internal_bus_reset(host); |
|
} else if((dsps & 0xfffff0f0) == A_DISCONNECT) { |
|
#ifdef NCR_700_DEBUG |
|
__u8 i = (dsps & 0xf00) >> 8; |
|
|
|
printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n", |
|
host->host_no, pun, lun, |
|
i, NCR_700_phase[i]); |
|
#endif |
|
save_for_reselection(hostdata, SCp, dsp); |
|
|
|
} else if(dsps == A_RESELECTION_IDENTIFIED) { |
|
__u8 lun; |
|
struct NCR_700_command_slot *slot; |
|
__u8 reselection_id = hostdata->reselection_id; |
|
struct scsi_device *SDp; |
|
|
|
lun = hostdata->msgin[0] & 0x1f; |
|
|
|
hostdata->reselection_id = 0xff; |
|
DEBUG(("scsi%d: (%d:%d) RESELECTED!\n", |
|
host->host_no, reselection_id, lun)); |
|
/* clear the reselection indicator */ |
|
SDp = __scsi_device_lookup(host, 0, reselection_id, lun); |
|
if(unlikely(SDp == NULL)) { |
|
printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n", |
|
host->host_no, reselection_id, lun); |
|
BUG(); |
|
} |
|
if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) { |
|
struct scsi_cmnd *SCp; |
|
|
|
SCp = scsi_host_find_tag(SDp->host, hostdata->msgin[2]); |
|
if(unlikely(SCp == NULL)) { |
|
printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", |
|
host->host_no, reselection_id, lun, hostdata->msgin[2]); |
|
BUG(); |
|
} |
|
|
|
slot = (struct NCR_700_command_slot *)SCp->host_scribble; |
|
DDEBUG(KERN_DEBUG, SDp, |
|
"reselection is tag %d, slot %p(%d)\n", |
|
hostdata->msgin[2], slot, slot->tag); |
|
} else { |
|
struct NCR_700_Device_Parameters *p = SDp->hostdata; |
|
struct scsi_cmnd *SCp = p->current_cmnd; |
|
|
|
if(unlikely(SCp == NULL)) { |
|
sdev_printk(KERN_ERR, SDp, |
|
"no saved request for untagged cmd\n"); |
|
BUG(); |
|
} |
|
slot = (struct NCR_700_command_slot *)SCp->host_scribble; |
|
} |
|
|
|
if(slot == NULL) { |
|
printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n", |
|
host->host_no, reselection_id, lun, |
|
hostdata->msgin[0], hostdata->msgin[1], |
|
hostdata->msgin[2]); |
|
} else { |
|
if(hostdata->state != NCR_700_HOST_BUSY) |
|
printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n", |
|
host->host_no); |
|
resume_offset = slot->resume_offset; |
|
hostdata->cmd = slot->cmnd; |
|
|
|
/* re-patch for this command */ |
|
script_patch_32_abs(hostdata, hostdata->script, |
|
CommandAddress, slot->pCmd); |
|
script_patch_16(hostdata, hostdata->script, |
|
CommandCount, slot->cmnd->cmd_len); |
|
script_patch_32_abs(hostdata, hostdata->script, |
|
SGScriptStartAddress, |
|
to32bit(&slot->pSG[0].ins)); |
|
|
|
/* Note: setting SXFER only works if we're |
|
* still in the MESSAGE phase, so it is vital |
|
* that ACK is still asserted when we process |
|
* the reselection message. The resume offset |
|
* should therefore always clear ACK */ |
|
NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device), |
|
host, SXFER_REG); |
|
dma_sync_from_dev(hostdata, hostdata->msgin, |
|
MSG_ARRAY_SIZE); |
|
dma_sync_to_dev(hostdata, hostdata->msgout, |
|
MSG_ARRAY_SIZE); |
|
/* I'm just being paranoid here, the command should |
|
* already have been flushed from the cache */ |
|
dma_sync_to_dev(hostdata, slot->cmnd->cmnd, |
|
slot->cmnd->cmd_len); |
|
|
|
|
|
|
|
} |
|
} else if(dsps == A_RESELECTED_DURING_SELECTION) { |
|
|
|
/* This section is full of debugging code because I've |
|
* never managed to reach it. I think what happens is |
|
* that, because the 700 runs with selection |
|
* interrupts enabled the whole time that we take a |
|
* selection interrupt before we manage to get to the |
|
* reselected script interrupt */ |
|
|
|
__u8 reselection_id = NCR_700_readb(host, SFBR_REG); |
|
struct NCR_700_command_slot *slot; |
|
|
|
/* Take out our own ID */ |
|
reselection_id &= ~(1<<host->this_id); |
|
|
|
/* I've never seen this happen, so keep this as a printk rather |
|
* than a debug */ |
|
printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n", |
|
host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count); |
|
|
|
{ |
|
/* FIXME: DEBUGGING CODE */ |
|
__u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]); |
|
int i; |
|
|
|
for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) { |
|
if(SG >= to32bit(&hostdata->slots[i].pSG[0]) |
|
&& SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS])) |
|
break; |
|
} |
|
printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset); |
|
SCp = hostdata->slots[i].cmnd; |
|
} |
|
|
|
if(SCp != NULL) { |
|
slot = (struct NCR_700_command_slot *)SCp->host_scribble; |
|
/* change slot from busy to queued to redo command */ |
|
slot->state = NCR_700_SLOT_QUEUED; |
|
} |
|
hostdata->cmd = NULL; |
|
|
|
if(reselection_id == 0) { |
|
if(hostdata->reselection_id == 0xff) { |
|
printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no); |
|
return 0; |
|
} else { |
|
printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n", |
|
host->host_no); |
|
reselection_id = hostdata->reselection_id; |
|
} |
|
} else { |
|
|
|
/* convert to real ID */ |
|
reselection_id = bitmap_to_number(reselection_id); |
|
} |
|
hostdata->reselection_id = reselection_id; |
|
/* just in case we have a stale simple tag message, clear it */ |
|
hostdata->msgin[1] = 0; |
|
dma_sync_to_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE); |
|
if(hostdata->tag_negotiated & (1<<reselection_id)) { |
|
resume_offset = hostdata->pScript + Ent_GetReselectionWithTag; |
|
} else { |
|
resume_offset = hostdata->pScript + Ent_GetReselectionData; |
|
} |
|
} else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) { |
|
/* we've just disconnected from the bus, do nothing since |
|
* a return here will re-run the queued command slot |
|
* that may have been interrupted by the initial selection */ |
|
DEBUG((" SELECTION COMPLETED\n")); |
|
} else if((dsps & 0xfffff0f0) == A_MSG_IN) { |
|
resume_offset = process_message(host, hostdata, SCp, |
|
dsp, dsps); |
|
} else if((dsps & 0xfffff000) == 0) { |
|
__u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8; |
|
printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n", |
|
host->host_no, pun, lun, NCR_700_condition[i], |
|
NCR_700_phase[j], dsp - hostdata->pScript); |
|
if(SCp != NULL) { |
|
struct scatterlist *sg; |
|
|
|
scsi_print_command(SCp); |
|
scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) { |
|
printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr); |
|
} |
|
} |
|
NCR_700_internal_bus_reset(host); |
|
} else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) { |
|
printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n", |
|
host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript); |
|
resume_offset = dsp; |
|
} else { |
|
printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n", |
|
host->host_no, pun, lun, dsps, dsp - hostdata->pScript); |
|
NCR_700_internal_bus_reset(host); |
|
} |
|
return resume_offset; |
|
} |
|
|
|
/* We run the 53c700 with selection interrupts always enabled. This |
|
* means that the chip may be selected as soon as the bus frees. On a |
|
* busy bus, this can be before the scripts engine finishes its |
|
* processing. Therefore, part of the selection processing has to be |
|
* to find out what the scripts engine is doing and complete the |
|
* function if necessary (i.e. process the pending disconnect or save |
|
* the interrupted initial selection */ |
|
STATIC inline __u32 |
|
process_selection(struct Scsi_Host *host, __u32 dsp) |
|
{ |
|
__u8 id = 0; /* Squash compiler warning */ |
|
int count = 0; |
|
__u32 resume_offset = 0; |
|
struct NCR_700_Host_Parameters *hostdata = |
|
(struct NCR_700_Host_Parameters *)host->hostdata[0]; |
|
struct scsi_cmnd *SCp = hostdata->cmd; |
|
__u8 sbcl; |
|
|
|
for(count = 0; count < 5; count++) { |
|
id = NCR_700_readb(host, hostdata->chip710 ? |
|
CTEST9_REG : SFBR_REG); |
|
|
|
/* Take out our own ID */ |
|
id &= ~(1<<host->this_id); |
|
if(id != 0) |
|
break; |
|
udelay(5); |
|
} |
|
sbcl = NCR_700_readb(host, SBCL_REG); |
|
if((sbcl & SBCL_IO) == 0) { |
|
/* mark as having been selected rather than reselected */ |
|
id = 0xff; |
|
} else { |
|
/* convert to real ID */ |
|
hostdata->reselection_id = id = bitmap_to_number(id); |
|
DEBUG(("scsi%d: Reselected by %d\n", |
|
host->host_no, id)); |
|
} |
|
if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) { |
|
struct NCR_700_command_slot *slot = |
|
(struct NCR_700_command_slot *)SCp->host_scribble; |
|
DEBUG((" ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset)); |
|
|
|
switch(dsp - hostdata->pScript) { |
|
case Ent_Disconnect1: |
|
case Ent_Disconnect2: |
|
save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript); |
|
break; |
|
case Ent_Disconnect3: |
|
case Ent_Disconnect4: |
|
save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript); |
|
break; |
|
case Ent_Disconnect5: |
|
case Ent_Disconnect6: |
|
save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript); |
|
break; |
|
case Ent_Disconnect7: |
|
case Ent_Disconnect8: |
|
save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript); |
|
break; |
|
case Ent_Finish1: |
|
case Ent_Finish2: |
|
process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata); |
|
break; |
|
|
|
default: |
|
slot->state = NCR_700_SLOT_QUEUED; |
|
break; |
|
} |
|
} |
|
hostdata->state = NCR_700_HOST_BUSY; |
|
hostdata->cmd = NULL; |
|
/* clear any stale simple tag message */ |
|
hostdata->msgin[1] = 0; |
|
dma_sync_to_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE); |
|
|
|
if(id == 0xff) { |
|
/* Selected as target, Ignore */ |
|
resume_offset = hostdata->pScript + Ent_SelectedAsTarget; |
|
} else if(hostdata->tag_negotiated & (1<<id)) { |
|
resume_offset = hostdata->pScript + Ent_GetReselectionWithTag; |
|
} else { |
|
resume_offset = hostdata->pScript + Ent_GetReselectionData; |
|
} |
|
return resume_offset; |
|
} |
|
|
|
static inline void |
|
NCR_700_clear_fifo(struct Scsi_Host *host) { |
|
const struct NCR_700_Host_Parameters *hostdata |
|
= (struct NCR_700_Host_Parameters *)host->hostdata[0]; |
|
if(hostdata->chip710) { |
|
NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG); |
|
} else { |
|
NCR_700_writeb(CLR_FIFO, host, DFIFO_REG); |
|
} |
|
} |
|
|
|
static inline void |
|
NCR_700_flush_fifo(struct Scsi_Host *host) { |
|
const struct NCR_700_Host_Parameters *hostdata |
|
= (struct NCR_700_Host_Parameters *)host->hostdata[0]; |
|
if(hostdata->chip710) { |
|
NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG); |
|
udelay(10); |
|
NCR_700_writeb(0, host, CTEST8_REG); |
|
} else { |
|
NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG); |
|
udelay(10); |
|
NCR_700_writeb(0, host, DFIFO_REG); |
|
} |
|
} |
|
|
|
|
|
/* The queue lock with interrupts disabled must be held on entry to |
|
* this function */ |
|
STATIC int |
|
NCR_700_start_command(struct scsi_cmnd *SCp) |
|
{ |
|
struct NCR_700_command_slot *slot = |
|
(struct NCR_700_command_slot *)SCp->host_scribble; |
|
struct NCR_700_Host_Parameters *hostdata = |
|
(struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; |
|
__u16 count = 1; /* for IDENTIFY message */ |
|
u8 lun = SCp->device->lun; |
|
|
|
if(hostdata->state != NCR_700_HOST_FREE) { |
|
/* keep this inside the lock to close the race window where |
|
* the running command finishes on another CPU while we don't |
|
* change the state to queued on this one */ |
|
slot->state = NCR_700_SLOT_QUEUED; |
|
|
|
DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n", |
|
SCp->device->host->host_no, slot->cmnd, slot)); |
|
return 0; |
|
} |
|
hostdata->state = NCR_700_HOST_BUSY; |
|
hostdata->cmd = SCp; |
|
slot->state = NCR_700_SLOT_BUSY; |
|
/* keep interrupts disabled until we have the command correctly |
|
* set up so we cannot take a selection interrupt */ |
|
|
|
hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE && |
|
slot->flags != NCR_700_FLAG_AUTOSENSE), |
|
lun); |
|
/* for INQUIRY or REQUEST_SENSE commands, we cannot be sure |
|
* if the negotiated transfer parameters still hold, so |
|
* always renegotiate them */ |
|
if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE || |
|
slot->flags == NCR_700_FLAG_AUTOSENSE) { |
|
NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC); |
|
} |
|
|
|
/* REQUEST_SENSE is asking for contingent I_T_L(_Q) status. |
|
* If a contingent allegiance condition exists, the device |
|
* will refuse all tags, so send the request sense as untagged |
|
* */ |
|
if((hostdata->tag_negotiated & (1<<scmd_id(SCp))) |
|
&& (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE && |
|
slot->flags != NCR_700_FLAG_AUTOSENSE)) { |
|
count += spi_populate_tag_msg(&hostdata->msgout[count], SCp); |
|
} |
|
|
|
if(hostdata->fast && |
|
NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) { |
|
count += spi_populate_sync_msg(&hostdata->msgout[count], |
|
spi_period(SCp->device->sdev_target), |
|
spi_offset(SCp->device->sdev_target)); |
|
NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); |
|
} |
|
|
|
script_patch_16(hostdata, hostdata->script, MessageCount, count); |
|
|
|
script_patch_ID(hostdata, hostdata->script, Device_ID, 1<<scmd_id(SCp)); |
|
|
|
script_patch_32_abs(hostdata, hostdata->script, CommandAddress, |
|
slot->pCmd); |
|
script_patch_16(hostdata, hostdata->script, CommandCount, SCp->cmd_len); |
|
/* finally plumb the beginning of the SG list into the script |
|
* */ |
|
script_patch_32_abs(hostdata, hostdata->script, |
|
SGScriptStartAddress, to32bit(&slot->pSG[0].ins)); |
|
NCR_700_clear_fifo(SCp->device->host); |
|
|
|
if(slot->resume_offset == 0) |
|
slot->resume_offset = hostdata->pScript; |
|
/* now perform all the writebacks and invalidates */ |
|
dma_sync_to_dev(hostdata, hostdata->msgout, count); |
|
dma_sync_from_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE); |
|
dma_sync_to_dev(hostdata, SCp->cmnd, SCp->cmd_len); |
|
dma_sync_from_dev(hostdata, hostdata->status, 1); |
|
|
|
/* set the synchronous period/offset */ |
|
NCR_700_writeb(NCR_700_get_SXFER(SCp->device), |
|
SCp->device->host, SXFER_REG); |
|
NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG); |
|
NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG); |
|
|
|
return 1; |
|
} |
|
|
|
irqreturn_t |
|
NCR_700_intr(int irq, void *dev_id) |
|
{ |
|
struct Scsi_Host *host = (struct Scsi_Host *)dev_id; |
|
struct NCR_700_Host_Parameters *hostdata = |
|
(struct NCR_700_Host_Parameters *)host->hostdata[0]; |
|
__u8 istat; |
|
__u32 resume_offset = 0; |
|
__u8 pun = 0xff, lun = 0xff; |
|
unsigned long flags; |
|
int handled = 0; |
|
|
|
/* Use the host lock to serialise access to the 53c700 |
|
* hardware. Note: In future, we may need to take the queue |
|
* lock to enter the done routines. When that happens, we |
|
* need to ensure that for this driver, the host lock and the |
|
* queue lock point to the same thing. */ |
|
spin_lock_irqsave(host->host_lock, flags); |
|
if((istat = NCR_700_readb(host, ISTAT_REG)) |
|
& (SCSI_INT_PENDING | DMA_INT_PENDING)) { |
|
__u32 dsps; |
|
__u8 sstat0 = 0, dstat = 0; |
|
__u32 dsp; |
|
struct scsi_cmnd *SCp = hostdata->cmd; |
|
|
|
handled = 1; |
|
SCp = hostdata->cmd; |
|
|
|
if(istat & SCSI_INT_PENDING) { |
|
udelay(10); |
|
|
|
sstat0 = NCR_700_readb(host, SSTAT0_REG); |
|
} |
|
|
|
if(istat & DMA_INT_PENDING) { |
|
udelay(10); |
|
|
|
dstat = NCR_700_readb(host, DSTAT_REG); |
|
} |
|
|
|
dsps = NCR_700_readl(host, DSPS_REG); |
|
dsp = NCR_700_readl(host, DSP_REG); |
|
|
|
DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n", |
|
host->host_no, istat, sstat0, dstat, |
|
(dsp - (__u32)(hostdata->pScript))/4, |
|
dsp, dsps)); |
|
|
|
if(SCp != NULL) { |
|
pun = SCp->device->id; |
|
lun = SCp->device->lun; |
|
} |
|
|
|
if(sstat0 & SCSI_RESET_DETECTED) { |
|
struct scsi_device *SDp; |
|
int i; |
|
|
|
hostdata->state = NCR_700_HOST_BUSY; |
|
|
|
printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n", |
|
host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript); |
|
|
|
scsi_report_bus_reset(host, 0); |
|
|
|
/* clear all the negotiated parameters */ |
|
__shost_for_each_device(SDp, host) |
|
NCR_700_clear_flag(SDp, ~0); |
|
|
|
/* clear all the slots and their pending commands */ |
|
for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) { |
|
struct scsi_cmnd *SCp; |
|
struct NCR_700_command_slot *slot = |
|
&hostdata->slots[i]; |
|
|
|
if(slot->state == NCR_700_SLOT_FREE) |
|
continue; |
|
|
|
SCp = slot->cmnd; |
|
printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n", |
|
slot, SCp); |
|
free_slot(slot, hostdata); |
|
SCp->host_scribble = NULL; |
|
NCR_700_set_depth(SCp->device, 0); |
|
/* NOTE: deadlock potential here: we |
|
* rely on mid-layer guarantees that |
|
* scsi_done won't try to issue the |
|
* command again otherwise we'll |
|
* deadlock on the |
|
* hostdata->state_lock */ |
|
SCp->result = DID_RESET << 16; |
|
SCp->scsi_done(SCp); |
|
} |
|
mdelay(25); |
|
NCR_700_chip_setup(host); |
|
|
|
hostdata->state = NCR_700_HOST_FREE; |
|
hostdata->cmd = NULL; |
|
/* signal back if this was an eh induced reset */ |
|
if(hostdata->eh_complete != NULL) |
|
complete(hostdata->eh_complete); |
|
goto out_unlock; |
|
} else if(sstat0 & SELECTION_TIMEOUT) { |
|
DEBUG(("scsi%d: (%d:%d) selection timeout\n", |
|
host->host_no, pun, lun)); |
|
NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16); |
|
} else if(sstat0 & PHASE_MISMATCH) { |
|
struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL : |
|
(struct NCR_700_command_slot *)SCp->host_scribble; |
|
|
|
if(dsp == Ent_SendMessage + 8 + hostdata->pScript) { |
|
/* It wants to reply to some part of |
|
* our message */ |
|
#ifdef NCR_700_DEBUG |
|
__u32 temp = NCR_700_readl(host, TEMP_REG); |
|
int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host)); |
|
printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG))); |
|
#endif |
|
resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch; |
|
} else if(dsp >= to32bit(&slot->pSG[0].ins) && |
|
dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) { |
|
int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff; |
|
int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List); |
|
int residual = NCR_700_data_residual(host); |
|
int i; |
|
#ifdef NCR_700_DEBUG |
|
__u32 naddr = NCR_700_readl(host, DNAD_REG); |
|
|
|
printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n", |
|
host->host_no, pun, lun, |
|
SGcount, data_transfer); |
|
scsi_print_command(SCp); |
|
if(residual) { |
|
printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n", |
|
host->host_no, pun, lun, |
|
SGcount, data_transfer, residual); |
|
} |
|
#endif |
|
data_transfer += residual; |
|
|
|
if(data_transfer != 0) { |
|
int count; |
|
__u32 pAddr; |
|
|
|
SGcount--; |
|
|
|
count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff); |
|
DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer)); |
|
slot->SG[SGcount].ins &= bS_to_host(0xff000000); |
|
slot->SG[SGcount].ins |= bS_to_host(data_transfer); |
|
pAddr = bS_to_cpu(slot->SG[SGcount].pAddr); |
|
pAddr += (count - data_transfer); |
|
#ifdef NCR_700_DEBUG |
|
if(pAddr != naddr) { |
|
printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual); |
|
} |
|
#endif |
|
slot->SG[SGcount].pAddr = bS_to_host(pAddr); |
|
} |
|
/* set the executed moves to nops */ |
|
for(i=0; i<SGcount; i++) { |
|
slot->SG[i].ins = bS_to_host(SCRIPT_NOP); |
|
slot->SG[i].pAddr = 0; |
|
} |
|
dma_sync_to_dev(hostdata, slot->SG, sizeof(slot->SG)); |
|
/* and pretend we disconnected after |
|
* the command phase */ |
|
resume_offset = hostdata->pScript + Ent_MsgInDuringData; |
|
/* make sure all the data is flushed */ |
|
NCR_700_flush_fifo(host); |
|
} else { |
|
__u8 sbcl = NCR_700_readb(host, SBCL_REG); |
|
printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n", |
|
host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl)); |
|
NCR_700_internal_bus_reset(host); |
|
} |
|
|
|
} else if(sstat0 & SCSI_GROSS_ERROR) { |
|
printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n", |
|
host->host_no, pun, lun); |
|
NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); |
|
} else if(sstat0 & PARITY_ERROR) { |
|
printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n", |
|
host->host_no, pun, lun); |
|
NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); |
|
} else if(dstat & SCRIPT_INT_RECEIVED) { |
|
DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n", |
|
host->host_no, pun, lun)); |
|
resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata); |
|
} else if(dstat & (ILGL_INST_DETECTED)) { |
|
printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n" |
|
" Please email [email protected] with the details\n", |
|
host->host_no, pun, lun, |
|
dsp, dsp - hostdata->pScript); |
|
NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); |
|
} else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) { |
|
printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n", |
|
host->host_no, pun, lun, dstat); |
|
NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16); |
|
} |
|
|
|
|
|
/* NOTE: selection interrupt processing MUST occur |
|
* after script interrupt processing to correctly cope |
|
* with the case where we process a disconnect and |
|
* then get reselected before we process the |
|
* disconnection */ |
|
if(sstat0 & SELECTED) { |
|
/* FIXME: It currently takes at least FOUR |
|
* interrupts to complete a command that |
|
* disconnects: one for the disconnect, one |
|
* for the reselection, one to get the |
|
* reselection data and one to complete the |
|
* command. If we guess the reselected |
|
* command here and prepare it, we only need |
|
* to get a reselection data interrupt if we |
|
* guessed wrongly. Since the interrupt |
|
* overhead is much greater than the command |
|
* setup, this would be an efficient |
|
* optimisation particularly as we probably |
|
* only have one outstanding command on a |
|
* target most of the time */ |
|
|
|
resume_offset = process_selection(host, dsp); |
|
|
|
} |
|
|
|
} |
|
|
|
if(resume_offset) { |
|
if(hostdata->state != NCR_700_HOST_BUSY) { |
|
printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n", |
|
host->host_no, resume_offset, resume_offset - hostdata->pScript); |
|
hostdata->state = NCR_700_HOST_BUSY; |
|
} |
|
|
|
DEBUG(("Attempting to resume at %x\n", resume_offset)); |
|
NCR_700_clear_fifo(host); |
|
NCR_700_writel(resume_offset, host, DSP_REG); |
|
} |
|
/* There is probably a technical no-no about this: If we're a |
|
* shared interrupt and we got this interrupt because the |
|
* other device needs servicing not us, we're still going to |
|
* check our queued commands here---of course, there shouldn't |
|
* be any outstanding.... */ |
|
if(hostdata->state == NCR_700_HOST_FREE) { |
|
int i; |
|
|
|
for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) { |
|
/* fairness: always run the queue from the last |
|
* position we left off */ |
|
int j = (i + hostdata->saved_slot_position) |
|
% NCR_700_COMMAND_SLOTS_PER_HOST; |
|
|
|
if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED) |
|
continue; |
|
if(NCR_700_start_command(hostdata->slots[j].cmnd)) { |
|
DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n", |
|
host->host_no, &hostdata->slots[j], |
|
hostdata->slots[j].cmnd)); |
|
hostdata->saved_slot_position = j + 1; |
|
} |
|
|
|
break; |
|
} |
|
} |
|
out_unlock: |
|
spin_unlock_irqrestore(host->host_lock, flags); |
|
return IRQ_RETVAL(handled); |
|
} |
|
|
|
static int |
|
NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *)) |
|
{ |
|
struct NCR_700_Host_Parameters *hostdata = |
|
(struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; |
|
__u32 move_ins; |
|
struct NCR_700_command_slot *slot; |
|
|
|
if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) { |
|
/* We're over our allocation, this should never happen |
|
* since we report the max allocation to the mid layer */ |
|
printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no); |
|
return 1; |
|
} |
|
/* check for untagged commands. We cannot have any outstanding |
|
* commands if we accept them. Commands could be untagged because: |
|
* |
|
* - The tag negotiated bitmap is clear |
|
* - The blk layer sent and untagged command |
|
*/ |
|
if(NCR_700_get_depth(SCp->device) != 0 |
|
&& (!(hostdata->tag_negotiated & (1<<scmd_id(SCp))) |
|
|| !(SCp->flags & SCMD_TAGGED))) { |
|
CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n", |
|
NCR_700_get_depth(SCp->device)); |
|
return SCSI_MLQUEUE_DEVICE_BUSY; |
|
} |
|
if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) { |
|
CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n", |
|
NCR_700_get_depth(SCp->device)); |
|
return SCSI_MLQUEUE_DEVICE_BUSY; |
|
} |
|
NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1); |
|
|
|
/* begin the command here */ |
|
/* no need to check for NULL, test for command_slot_count above |
|
* ensures a slot is free */ |
|
slot = find_empty_slot(hostdata); |
|
|
|
slot->cmnd = SCp; |
|
|
|
SCp->scsi_done = done; |
|
SCp->host_scribble = (unsigned char *)slot; |
|
SCp->SCp.ptr = NULL; |
|
SCp->SCp.buffer = NULL; |
|
|
|
#ifdef NCR_700_DEBUG |
|
printk("53c700: scsi%d, command ", SCp->device->host->host_no); |
|
scsi_print_command(SCp); |
|
#endif |
|
if ((SCp->flags & SCMD_TAGGED) |
|
&& (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0 |
|
&& NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) { |
|
scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n"); |
|
hostdata->tag_negotiated |= (1<<scmd_id(SCp)); |
|
NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION); |
|
} |
|
|
|
/* here we may have to process an untagged command. The gate |
|
* above ensures that this will be the only one outstanding, |
|
* so clear the tag negotiated bit. |
|
* |
|
* FIXME: This will royally screw up on multiple LUN devices |
|
* */ |
|
if (!(SCp->flags & SCMD_TAGGED) |
|
&& (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) { |
|
scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n"); |
|
hostdata->tag_negotiated &= ~(1<<scmd_id(SCp)); |
|
} |
|
|
|
if ((hostdata->tag_negotiated & (1<<scmd_id(SCp))) && |
|
SCp->device->simple_tags) { |
|
slot->tag = scsi_cmd_to_rq(SCp)->tag; |
|
CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n", |
|
slot->tag, slot); |
|
} else { |
|
struct NCR_700_Device_Parameters *p = SCp->device->hostdata; |
|
|
|
slot->tag = SCSI_NO_TAG; |
|
/* save current command for reselection */ |
|
p->current_cmnd = SCp; |
|
} |
|
/* sanity check: some of the commands generated by the mid-layer |
|
* have an eccentric idea of their sc_data_direction */ |
|
if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) && |
|
SCp->sc_data_direction != DMA_NONE) { |
|
#ifdef NCR_700_DEBUG |
|
printk("53c700: Command"); |
|
scsi_print_command(SCp); |
|
printk("Has wrong data direction %d\n", SCp->sc_data_direction); |
|
#endif |
|
SCp->sc_data_direction = DMA_NONE; |
|
} |
|
|
|
switch (SCp->cmnd[0]) { |
|
case REQUEST_SENSE: |
|
/* clear the internal sense magic */ |
|
SCp->cmnd[6] = 0; |
|
fallthrough; |
|
default: |
|
/* OK, get it from the command */ |
|
switch(SCp->sc_data_direction) { |
|
case DMA_BIDIRECTIONAL: |
|
default: |
|
printk(KERN_ERR "53c700: Unknown command for data direction "); |
|
scsi_print_command(SCp); |
|
|
|
move_ins = 0; |
|
break; |
|
case DMA_NONE: |
|
move_ins = 0; |
|
break; |
|
case DMA_FROM_DEVICE: |
|
move_ins = SCRIPT_MOVE_DATA_IN; |
|
break; |
|
case DMA_TO_DEVICE: |
|
move_ins = SCRIPT_MOVE_DATA_OUT; |
|
break; |
|
} |
|
} |
|
|
|
/* now build the scatter gather list */ |
|
if(move_ins != 0) { |
|
int i; |
|
int sg_count; |
|
dma_addr_t vPtr = 0; |
|
struct scatterlist *sg; |
|
__u32 count = 0; |
|
|
|
sg_count = scsi_dma_map(SCp); |
|
BUG_ON(sg_count < 0); |
|
|
|
scsi_for_each_sg(SCp, sg, sg_count, i) { |
|
vPtr = sg_dma_address(sg); |
|
count = sg_dma_len(sg); |
|
|
|
slot->SG[i].ins = bS_to_host(move_ins | count); |
|
DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n", |
|
i, count, slot->SG[i].ins, (unsigned long)vPtr)); |
|
slot->SG[i].pAddr = bS_to_host(vPtr); |
|
} |
|
slot->SG[i].ins = bS_to_host(SCRIPT_RETURN); |
|
slot->SG[i].pAddr = 0; |
|
dma_sync_to_dev(hostdata, slot->SG, sizeof(slot->SG)); |
|
DEBUG((" SETTING %p to %x\n", |
|
(&slot->pSG[i].ins), |
|
slot->SG[i].ins)); |
|
} |
|
slot->resume_offset = 0; |
|
slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd, |
|
MAX_COMMAND_SIZE, DMA_TO_DEVICE); |
|
NCR_700_start_command(SCp); |
|
return 0; |
|
} |
|
|
|
STATIC DEF_SCSI_QCMD(NCR_700_queuecommand) |
|
|
|
STATIC int |
|
NCR_700_abort(struct scsi_cmnd * SCp) |
|
{ |
|
struct NCR_700_command_slot *slot; |
|
|
|
scmd_printk(KERN_INFO, SCp, "abort command\n"); |
|
|
|
slot = (struct NCR_700_command_slot *)SCp->host_scribble; |
|
|
|
if(slot == NULL) |
|
/* no outstanding command to abort */ |
|
return SUCCESS; |
|
if(SCp->cmnd[0] == TEST_UNIT_READY) { |
|
/* FIXME: This is because of a problem in the new |
|
* error handler. When it is in error recovery, it |
|
* will send a TUR to a device it thinks may still be |
|
* showing a problem. If the TUR isn't responded to, |
|
* it will abort it and mark the device off line. |
|
* Unfortunately, it does no other error recovery, so |
|
* this would leave us with an outstanding command |
|
* occupying a slot. Rather than allow this to |
|
* happen, we issue a bus reset to force all |
|
* outstanding commands to terminate here. */ |
|
NCR_700_internal_bus_reset(SCp->device->host); |
|
/* still drop through and return failed */ |
|
} |
|
return FAILED; |
|
|
|
} |
|
|
|
STATIC int |
|
NCR_700_host_reset(struct scsi_cmnd * SCp) |
|
{ |
|
DECLARE_COMPLETION_ONSTACK(complete); |
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struct NCR_700_Host_Parameters *hostdata = |
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(struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0]; |
|
|
|
scmd_printk(KERN_INFO, SCp, |
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"New error handler wants HOST reset, cmd %p\n\t", SCp); |
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scsi_print_command(SCp); |
|
|
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/* In theory, eh_complete should always be null because the |
|
* eh is single threaded, but just in case we're handling a |
|
* reset via sg or something */ |
|
spin_lock_irq(SCp->device->host->host_lock); |
|
while (hostdata->eh_complete != NULL) { |
|
spin_unlock_irq(SCp->device->host->host_lock); |
|
msleep_interruptible(100); |
|
spin_lock_irq(SCp->device->host->host_lock); |
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} |
|
|
|
hostdata->eh_complete = &complete; |
|
NCR_700_internal_bus_reset(SCp->device->host); |
|
NCR_700_chip_reset(SCp->device->host); |
|
|
|
spin_unlock_irq(SCp->device->host->host_lock); |
|
wait_for_completion(&complete); |
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spin_lock_irq(SCp->device->host->host_lock); |
|
|
|
hostdata->eh_complete = NULL; |
|
/* Revalidate the transport parameters of the failing device */ |
|
if(hostdata->fast) |
|
spi_schedule_dv_device(SCp->device); |
|
|
|
spin_unlock_irq(SCp->device->host->host_lock); |
|
return SUCCESS; |
|
} |
|
|
|
STATIC void |
|
NCR_700_set_period(struct scsi_target *STp, int period) |
|
{ |
|
struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent); |
|
struct NCR_700_Host_Parameters *hostdata = |
|
(struct NCR_700_Host_Parameters *)SHp->hostdata[0]; |
|
|
|
if(!hostdata->fast) |
|
return; |
|
|
|
if(period < hostdata->min_period) |
|
period = hostdata->min_period; |
|
|
|
spi_period(STp) = period; |
|
spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC | |
|
NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); |
|
spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION; |
|
} |
|
|
|
STATIC void |
|
NCR_700_set_offset(struct scsi_target *STp, int offset) |
|
{ |
|
struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent); |
|
struct NCR_700_Host_Parameters *hostdata = |
|
(struct NCR_700_Host_Parameters *)SHp->hostdata[0]; |
|
int max_offset = hostdata->chip710 |
|
? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET; |
|
|
|
if(!hostdata->fast) |
|
return; |
|
|
|
if(offset > max_offset) |
|
offset = max_offset; |
|
|
|
/* if we're currently async, make sure the period is reasonable */ |
|
if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period || |
|
spi_period(STp) > 0xff)) |
|
spi_period(STp) = hostdata->min_period; |
|
|
|
spi_offset(STp) = offset; |
|
spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC | |
|
NCR_700_DEV_BEGIN_SYNC_NEGOTIATION); |
|
spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION; |
|
} |
|
|
|
STATIC int |
|
NCR_700_slave_alloc(struct scsi_device *SDp) |
|
{ |
|
SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters), |
|
GFP_KERNEL); |
|
|
|
if (!SDp->hostdata) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
STATIC int |
|
NCR_700_slave_configure(struct scsi_device *SDp) |
|
{ |
|
struct NCR_700_Host_Parameters *hostdata = |
|
(struct NCR_700_Host_Parameters *)SDp->host->hostdata[0]; |
|
|
|
/* to do here: allocate memory; build a queue_full list */ |
|
if(SDp->tagged_supported) { |
|
scsi_change_queue_depth(SDp, NCR_700_DEFAULT_TAGS); |
|
NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION); |
|
} |
|
|
|
if(hostdata->fast) { |
|
/* Find the correct offset and period via domain validation */ |
|
if (!spi_initial_dv(SDp->sdev_target)) |
|
spi_dv_device(SDp); |
|
} else { |
|
spi_offset(SDp->sdev_target) = 0; |
|
spi_period(SDp->sdev_target) = 0; |
|
} |
|
return 0; |
|
} |
|
|
|
STATIC void |
|
NCR_700_slave_destroy(struct scsi_device *SDp) |
|
{ |
|
kfree(SDp->hostdata); |
|
SDp->hostdata = NULL; |
|
} |
|
|
|
static int |
|
NCR_700_change_queue_depth(struct scsi_device *SDp, int depth) |
|
{ |
|
if (depth > NCR_700_MAX_TAGS) |
|
depth = NCR_700_MAX_TAGS; |
|
return scsi_change_queue_depth(SDp, depth); |
|
} |
|
|
|
static ssize_t |
|
NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf) |
|
{ |
|
struct scsi_device *SDp = to_scsi_device(dev); |
|
|
|
return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp)); |
|
} |
|
|
|
static struct device_attribute NCR_700_active_tags_attr = { |
|
.attr = { |
|
.name = "active_tags", |
|
.mode = S_IRUGO, |
|
}, |
|
.show = NCR_700_show_active_tags, |
|
}; |
|
|
|
STATIC struct device_attribute *NCR_700_dev_attrs[] = { |
|
&NCR_700_active_tags_attr, |
|
NULL, |
|
}; |
|
|
|
EXPORT_SYMBOL(NCR_700_detect); |
|
EXPORT_SYMBOL(NCR_700_release); |
|
EXPORT_SYMBOL(NCR_700_intr); |
|
|
|
static struct spi_function_template NCR_700_transport_functions = { |
|
.set_period = NCR_700_set_period, |
|
.show_period = 1, |
|
.set_offset = NCR_700_set_offset, |
|
.show_offset = 1, |
|
}; |
|
|
|
static int __init NCR_700_init(void) |
|
{ |
|
NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions); |
|
if(!NCR_700_transport_template) |
|
return -ENODEV; |
|
return 0; |
|
} |
|
|
|
static void __exit NCR_700_exit(void) |
|
{ |
|
spi_release_transport(NCR_700_transport_template); |
|
} |
|
|
|
module_init(NCR_700_init); |
|
module_exit(NCR_700_exit); |
|
|
|
|