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1076 lines
26 KiB
1076 lines
26 KiB
/* |
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pf.c (c) 1997-8 Grant R. Guenther <[email protected]> |
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Under the terms of the GNU General Public License. |
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|
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This is the high-level driver for parallel port ATAPI disk |
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drives based on chips supported by the paride module. |
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|
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By default, the driver will autoprobe for a single parallel |
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port ATAPI disk drive, but if their individual parameters are |
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specified, the driver can handle up to 4 drives. |
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|
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The behaviour of the pf driver can be altered by setting |
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some parameters from the insmod command line. The following |
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parameters are adjustable: |
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|
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drive0 These four arguments can be arrays of |
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drive1 1-7 integers as follows: |
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drive2 |
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drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<lun>,<dly> |
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|
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Where, |
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|
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<prt> is the base of the parallel port address for |
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the corresponding drive. (required) |
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|
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<pro> is the protocol number for the adapter that |
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supports this drive. These numbers are |
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logged by 'paride' when the protocol modules |
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are initialised. (0 if not given) |
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|
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<uni> for those adapters that support chained |
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devices, this is the unit selector for the |
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chain of devices on the given port. It should |
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be zero for devices that don't support chaining. |
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(0 if not given) |
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|
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<mod> this can be -1 to choose the best mode, or one |
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of the mode numbers supported by the adapter. |
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(-1 if not given) |
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<slv> ATAPI CDroms can be jumpered to master or slave. |
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Set this to 0 to choose the master drive, 1 to |
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choose the slave, -1 (the default) to choose the |
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first drive found. |
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<lun> Some ATAPI devices support multiple LUNs. |
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One example is the ATAPI PD/CD drive from |
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Matshita/Panasonic. This device has a |
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CD drive on LUN 0 and a PD drive on LUN 1. |
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By default, the driver will search for the |
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first LUN with a supported device. Set |
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this parameter to force it to use a specific |
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LUN. (default -1) |
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|
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<dly> some parallel ports require the driver to |
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go more slowly. -1 sets a default value that |
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should work with the chosen protocol. Otherwise, |
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set this to a small integer, the larger it is |
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the slower the port i/o. In some cases, setting |
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this to zero will speed up the device. (default -1) |
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|
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major You may use this parameter to override the |
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default major number (47) that this driver |
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will use. Be sure to change the device |
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name as well. |
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|
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name This parameter is a character string that |
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contains the name the kernel will use for this |
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device (in /proc output, for instance). |
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(default "pf"). |
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|
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cluster The driver will attempt to aggregate requests |
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for adjacent blocks into larger multi-block |
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clusters. The maximum cluster size (in 512 |
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byte sectors) is set with this parameter. |
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(default 64) |
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|
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verbose This parameter controls the amount of logging |
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that the driver will do. Set it to 0 for |
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normal operation, 1 to see autoprobe progress |
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messages, or 2 to see additional debugging |
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output. (default 0) |
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|
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nice This parameter controls the driver's use of |
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idle CPU time, at the expense of some speed. |
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|
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If this driver is built into the kernel, you can use the |
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following command line parameters, with the same values |
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as the corresponding module parameters listed above: |
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|
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pf.drive0 |
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pf.drive1 |
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pf.drive2 |
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pf.drive3 |
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pf.cluster |
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pf.nice |
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|
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In addition, you can use the parameter pf.disable to disable |
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the driver entirely. |
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|
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*/ |
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|
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/* Changes: |
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|
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1.01 GRG 1998.05.03 Changes for SMP. Eliminate sti(). |
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Fix for drives that don't clear STAT_ERR |
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until after next CDB delivered. |
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Small change in pf_completion to round |
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up transfer size. |
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1.02 GRG 1998.06.16 Eliminated an Ugh |
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1.03 GRG 1998.08.16 Use HZ in loop timings, extra debugging |
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1.04 GRG 1998.09.24 Added jumbo support |
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|
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*/ |
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#define PF_VERSION "1.04" |
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#define PF_MAJOR 47 |
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#define PF_NAME "pf" |
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#define PF_UNITS 4 |
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|
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#include <linux/types.h> |
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|
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/* Here are things one can override from the insmod command. |
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Most are autoprobed by paride unless set here. Verbose is off |
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by default. |
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|
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*/ |
|
|
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static bool verbose = 0; |
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static int major = PF_MAJOR; |
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static char *name = PF_NAME; |
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static int cluster = 64; |
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static int nice = 0; |
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static int disable = 0; |
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|
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static int drive0[7] = { 0, 0, 0, -1, -1, -1, -1 }; |
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static int drive1[7] = { 0, 0, 0, -1, -1, -1, -1 }; |
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static int drive2[7] = { 0, 0, 0, -1, -1, -1, -1 }; |
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static int drive3[7] = { 0, 0, 0, -1, -1, -1, -1 }; |
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|
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static int (*drives[4])[7] = {&drive0, &drive1, &drive2, &drive3}; |
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static int pf_drive_count; |
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|
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enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY}; |
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|
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/* end of parameters */ |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/fs.h> |
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#include <linux/delay.h> |
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#include <linux/hdreg.h> |
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#include <linux/cdrom.h> |
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#include <linux/spinlock.h> |
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#include <linux/blk-mq.h> |
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#include <linux/blkpg.h> |
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#include <linux/mutex.h> |
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#include <linux/uaccess.h> |
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|
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static DEFINE_MUTEX(pf_mutex); |
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static DEFINE_SPINLOCK(pf_spin_lock); |
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|
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module_param(verbose, bool, 0644); |
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module_param(major, int, 0); |
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module_param(name, charp, 0); |
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module_param(cluster, int, 0); |
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module_param(nice, int, 0); |
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module_param_array(drive0, int, NULL, 0); |
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module_param_array(drive1, int, NULL, 0); |
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module_param_array(drive2, int, NULL, 0); |
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module_param_array(drive3, int, NULL, 0); |
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|
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#include "paride.h" |
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#include "pseudo.h" |
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|
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/* constants for faking geometry numbers */ |
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|
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#define PF_FD_MAX 8192 /* use FD geometry under this size */ |
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#define PF_FD_HDS 2 |
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#define PF_FD_SPT 18 |
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#define PF_HD_HDS 64 |
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#define PF_HD_SPT 32 |
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|
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#define PF_MAX_RETRIES 5 |
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#define PF_TMO 800 /* interrupt timeout in jiffies */ |
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#define PF_SPIN_DEL 50 /* spin delay in micro-seconds */ |
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#define PF_SPIN (1000000*PF_TMO)/(HZ*PF_SPIN_DEL) |
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|
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#define STAT_ERR 0x00001 |
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#define STAT_INDEX 0x00002 |
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#define STAT_ECC 0x00004 |
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#define STAT_DRQ 0x00008 |
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#define STAT_SEEK 0x00010 |
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#define STAT_WRERR 0x00020 |
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#define STAT_READY 0x00040 |
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#define STAT_BUSY 0x00080 |
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|
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#define ATAPI_REQ_SENSE 0x03 |
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#define ATAPI_LOCK 0x1e |
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#define ATAPI_DOOR 0x1b |
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#define ATAPI_MODE_SENSE 0x5a |
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#define ATAPI_CAPACITY 0x25 |
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#define ATAPI_IDENTIFY 0x12 |
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#define ATAPI_READ_10 0x28 |
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#define ATAPI_WRITE_10 0x2a |
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|
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static int pf_open(struct block_device *bdev, fmode_t mode); |
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static blk_status_t pf_queue_rq(struct blk_mq_hw_ctx *hctx, |
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const struct blk_mq_queue_data *bd); |
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static int pf_ioctl(struct block_device *bdev, fmode_t mode, |
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unsigned int cmd, unsigned long arg); |
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static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo); |
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static void pf_release(struct gendisk *disk, fmode_t mode); |
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|
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static int pf_detect(void); |
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static void do_pf_read(void); |
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static void do_pf_read_start(void); |
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static void do_pf_write(void); |
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static void do_pf_write_start(void); |
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static void do_pf_read_drq(void); |
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static void do_pf_write_done(void); |
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|
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#define PF_NM 0 |
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#define PF_RO 1 |
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#define PF_RW 2 |
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|
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#define PF_NAMELEN 8 |
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struct pf_unit { |
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struct pi_adapter pia; /* interface to paride layer */ |
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struct pi_adapter *pi; |
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int removable; /* removable media device ? */ |
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int media_status; /* media present ? WP ? */ |
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int drive; /* drive */ |
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int lun; |
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int access; /* count of active opens ... */ |
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int present; /* device present ? */ |
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char name[PF_NAMELEN]; /* pf0, pf1, ... */ |
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struct gendisk *disk; |
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struct blk_mq_tag_set tag_set; |
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struct list_head rq_list; |
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}; |
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|
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static struct pf_unit units[PF_UNITS]; |
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|
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static int pf_identify(struct pf_unit *pf); |
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static void pf_lock(struct pf_unit *pf, int func); |
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static void pf_eject(struct pf_unit *pf); |
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static unsigned int pf_check_events(struct gendisk *disk, |
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unsigned int clearing); |
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static char pf_scratch[512]; /* scratch block buffer */ |
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/* the variables below are used mainly in the I/O request engine, which |
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processes only one request at a time. |
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*/ |
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static int pf_retries = 0; /* i/o error retry count */ |
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static int pf_busy = 0; /* request being processed ? */ |
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static struct request *pf_req; /* current request */ |
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static int pf_block; /* address of next requested block */ |
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static int pf_count; /* number of blocks still to do */ |
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static int pf_run; /* sectors in current cluster */ |
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static int pf_cmd; /* current command READ/WRITE */ |
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static struct pf_unit *pf_current;/* unit of current request */ |
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static int pf_mask; /* stopper for pseudo-int */ |
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static char *pf_buf; /* buffer for request in progress */ |
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static void *par_drv; /* reference of parport driver */ |
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|
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/* kernel glue structures */ |
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static const struct block_device_operations pf_fops = { |
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.owner = THIS_MODULE, |
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.open = pf_open, |
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.release = pf_release, |
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.ioctl = pf_ioctl, |
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.compat_ioctl = pf_ioctl, |
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.getgeo = pf_getgeo, |
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.check_events = pf_check_events, |
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}; |
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static const struct blk_mq_ops pf_mq_ops = { |
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.queue_rq = pf_queue_rq, |
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}; |
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static void __init pf_init_units(void) |
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{ |
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struct pf_unit *pf; |
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int unit; |
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pf_drive_count = 0; |
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for (unit = 0, pf = units; unit < PF_UNITS; unit++, pf++) { |
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struct gendisk *disk; |
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if (blk_mq_alloc_sq_tag_set(&pf->tag_set, &pf_mq_ops, 1, |
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BLK_MQ_F_SHOULD_MERGE)) |
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continue; |
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disk = blk_mq_alloc_disk(&pf->tag_set, pf); |
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if (IS_ERR(disk)) { |
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blk_mq_free_tag_set(&pf->tag_set); |
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continue; |
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} |
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INIT_LIST_HEAD(&pf->rq_list); |
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blk_queue_max_segments(disk->queue, cluster); |
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blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH); |
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pf->disk = disk; |
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pf->pi = &pf->pia; |
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pf->media_status = PF_NM; |
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pf->drive = (*drives[unit])[D_SLV]; |
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pf->lun = (*drives[unit])[D_LUN]; |
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snprintf(pf->name, PF_NAMELEN, "%s%d", name, unit); |
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disk->major = major; |
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disk->first_minor = unit; |
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disk->minors = 1; |
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strcpy(disk->disk_name, pf->name); |
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disk->fops = &pf_fops; |
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disk->events = DISK_EVENT_MEDIA_CHANGE; |
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if (!(*drives[unit])[D_PRT]) |
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pf_drive_count++; |
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} |
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} |
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static int pf_open(struct block_device *bdev, fmode_t mode) |
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{ |
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struct pf_unit *pf = bdev->bd_disk->private_data; |
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int ret; |
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mutex_lock(&pf_mutex); |
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pf_identify(pf); |
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ret = -ENODEV; |
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if (pf->media_status == PF_NM) |
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goto out; |
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ret = -EROFS; |
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if ((pf->media_status == PF_RO) && (mode & FMODE_WRITE)) |
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goto out; |
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ret = 0; |
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pf->access++; |
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if (pf->removable) |
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pf_lock(pf, 1); |
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out: |
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mutex_unlock(&pf_mutex); |
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return ret; |
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} |
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static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
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{ |
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struct pf_unit *pf = bdev->bd_disk->private_data; |
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sector_t capacity = get_capacity(pf->disk); |
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|
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if (capacity < PF_FD_MAX) { |
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geo->cylinders = sector_div(capacity, PF_FD_HDS * PF_FD_SPT); |
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geo->heads = PF_FD_HDS; |
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geo->sectors = PF_FD_SPT; |
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} else { |
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geo->cylinders = sector_div(capacity, PF_HD_HDS * PF_HD_SPT); |
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geo->heads = PF_HD_HDS; |
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geo->sectors = PF_HD_SPT; |
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} |
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return 0; |
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} |
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static int pf_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) |
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{ |
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struct pf_unit *pf = bdev->bd_disk->private_data; |
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if (cmd != CDROMEJECT) |
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return -EINVAL; |
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if (pf->access != 1) |
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return -EBUSY; |
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mutex_lock(&pf_mutex); |
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pf_eject(pf); |
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mutex_unlock(&pf_mutex); |
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return 0; |
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} |
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static void pf_release(struct gendisk *disk, fmode_t mode) |
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{ |
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struct pf_unit *pf = disk->private_data; |
|
|
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mutex_lock(&pf_mutex); |
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if (pf->access <= 0) { |
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mutex_unlock(&pf_mutex); |
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WARN_ON(1); |
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return; |
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} |
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pf->access--; |
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|
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if (!pf->access && pf->removable) |
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pf_lock(pf, 0); |
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mutex_unlock(&pf_mutex); |
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} |
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static unsigned int pf_check_events(struct gendisk *disk, unsigned int clearing) |
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{ |
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return DISK_EVENT_MEDIA_CHANGE; |
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} |
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|
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static inline int status_reg(struct pf_unit *pf) |
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{ |
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return pi_read_regr(pf->pi, 1, 6); |
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} |
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|
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static inline int read_reg(struct pf_unit *pf, int reg) |
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{ |
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return pi_read_regr(pf->pi, 0, reg); |
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} |
|
|
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static inline void write_reg(struct pf_unit *pf, int reg, int val) |
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{ |
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pi_write_regr(pf->pi, 0, reg, val); |
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} |
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|
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static int pf_wait(struct pf_unit *pf, int go, int stop, char *fun, char *msg) |
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{ |
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int j, r, e, s, p; |
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|
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j = 0; |
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while ((((r = status_reg(pf)) & go) || (stop && (!(r & stop)))) |
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&& (j++ < PF_SPIN)) |
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udelay(PF_SPIN_DEL); |
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|
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if ((r & (STAT_ERR & stop)) || (j > PF_SPIN)) { |
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s = read_reg(pf, 7); |
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e = read_reg(pf, 1); |
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p = read_reg(pf, 2); |
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if (j > PF_SPIN) |
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e |= 0x100; |
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if (fun) |
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printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x" |
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" loop=%d phase=%d\n", |
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pf->name, fun, msg, r, s, e, j, p); |
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return (e << 8) + s; |
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} |
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return 0; |
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} |
|
|
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static int pf_command(struct pf_unit *pf, char *cmd, int dlen, char *fun) |
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{ |
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pi_connect(pf->pi); |
|
|
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write_reg(pf, 6, 0xa0+0x10*pf->drive); |
|
|
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if (pf_wait(pf, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) { |
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pi_disconnect(pf->pi); |
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return -1; |
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} |
|
|
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write_reg(pf, 4, dlen % 256); |
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write_reg(pf, 5, dlen / 256); |
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write_reg(pf, 7, 0xa0); /* ATAPI packet command */ |
|
|
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if (pf_wait(pf, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) { |
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pi_disconnect(pf->pi); |
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return -1; |
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} |
|
|
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if (read_reg(pf, 2) != 1) { |
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printk("%s: %s: command phase error\n", pf->name, fun); |
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pi_disconnect(pf->pi); |
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return -1; |
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} |
|
|
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pi_write_block(pf->pi, cmd, 12); |
|
|
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return 0; |
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} |
|
|
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static int pf_completion(struct pf_unit *pf, char *buf, char *fun) |
|
{ |
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int r, s, n; |
|
|
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r = pf_wait(pf, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR, |
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fun, "completion"); |
|
|
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if ((read_reg(pf, 2) & 2) && (read_reg(pf, 7) & STAT_DRQ)) { |
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n = (((read_reg(pf, 4) + 256 * read_reg(pf, 5)) + |
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3) & 0xfffc); |
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pi_read_block(pf->pi, buf, n); |
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} |
|
|
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s = pf_wait(pf, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done"); |
|
|
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pi_disconnect(pf->pi); |
|
|
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return (r ? r : s); |
|
} |
|
|
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static void pf_req_sense(struct pf_unit *pf, int quiet) |
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{ |
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char rs_cmd[12] = |
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{ ATAPI_REQ_SENSE, pf->lun << 5, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 }; |
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char buf[16]; |
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int r; |
|
|
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r = pf_command(pf, rs_cmd, 16, "Request sense"); |
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mdelay(1); |
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if (!r) |
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pf_completion(pf, buf, "Request sense"); |
|
|
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if ((!r) && (!quiet)) |
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printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n", |
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pf->name, buf[2] & 0xf, buf[12], buf[13]); |
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} |
|
|
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static int pf_atapi(struct pf_unit *pf, char *cmd, int dlen, char *buf, char *fun) |
|
{ |
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int r; |
|
|
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r = pf_command(pf, cmd, dlen, fun); |
|
mdelay(1); |
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if (!r) |
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r = pf_completion(pf, buf, fun); |
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if (r) |
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pf_req_sense(pf, !fun); |
|
|
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return r; |
|
} |
|
|
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static void pf_lock(struct pf_unit *pf, int func) |
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{ |
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char lo_cmd[12] = { ATAPI_LOCK, pf->lun << 5, 0, 0, func, 0, 0, 0, 0, 0, 0, 0 }; |
|
|
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pf_atapi(pf, lo_cmd, 0, pf_scratch, func ? "lock" : "unlock"); |
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} |
|
|
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static void pf_eject(struct pf_unit *pf) |
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{ |
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char ej_cmd[12] = { ATAPI_DOOR, pf->lun << 5, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 }; |
|
|
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pf_lock(pf, 0); |
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pf_atapi(pf, ej_cmd, 0, pf_scratch, "eject"); |
|
} |
|
|
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#define PF_RESET_TMO 30 /* in tenths of a second */ |
|
|
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static void pf_sleep(int cs) |
|
{ |
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schedule_timeout_interruptible(cs); |
|
} |
|
|
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/* the ATAPI standard actually specifies the contents of all 7 registers |
|
after a reset, but the specification is ambiguous concerning the last |
|
two bytes, and different drives interpret the standard differently. |
|
*/ |
|
|
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static int pf_reset(struct pf_unit *pf) |
|
{ |
|
int i, k, flg; |
|
int expect[5] = { 1, 1, 1, 0x14, 0xeb }; |
|
|
|
pi_connect(pf->pi); |
|
write_reg(pf, 6, 0xa0+0x10*pf->drive); |
|
write_reg(pf, 7, 8); |
|
|
|
pf_sleep(20 * HZ / 1000); |
|
|
|
k = 0; |
|
while ((k++ < PF_RESET_TMO) && (status_reg(pf) & STAT_BUSY)) |
|
pf_sleep(HZ / 10); |
|
|
|
flg = 1; |
|
for (i = 0; i < 5; i++) |
|
flg &= (read_reg(pf, i + 1) == expect[i]); |
|
|
|
if (verbose) { |
|
printk("%s: Reset (%d) signature = ", pf->name, k); |
|
for (i = 0; i < 5; i++) |
|
printk("%3x", read_reg(pf, i + 1)); |
|
if (!flg) |
|
printk(" (incorrect)"); |
|
printk("\n"); |
|
} |
|
|
|
pi_disconnect(pf->pi); |
|
return flg - 1; |
|
} |
|
|
|
static void pf_mode_sense(struct pf_unit *pf) |
|
{ |
|
char ms_cmd[12] = |
|
{ ATAPI_MODE_SENSE, pf->lun << 5, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0 }; |
|
char buf[8]; |
|
|
|
pf_atapi(pf, ms_cmd, 8, buf, "mode sense"); |
|
pf->media_status = PF_RW; |
|
if (buf[3] & 0x80) |
|
pf->media_status = PF_RO; |
|
} |
|
|
|
static void xs(char *buf, char *targ, int offs, int len) |
|
{ |
|
int j, k, l; |
|
|
|
j = 0; |
|
l = 0; |
|
for (k = 0; k < len; k++) |
|
if ((buf[k + offs] != 0x20) || (buf[k + offs] != l)) |
|
l = targ[j++] = buf[k + offs]; |
|
if (l == 0x20) |
|
j--; |
|
targ[j] = 0; |
|
} |
|
|
|
static int xl(char *buf, int offs) |
|
{ |
|
int v, k; |
|
|
|
v = 0; |
|
for (k = 0; k < 4; k++) |
|
v = v * 256 + (buf[k + offs] & 0xff); |
|
return v; |
|
} |
|
|
|
static void pf_get_capacity(struct pf_unit *pf) |
|
{ |
|
char rc_cmd[12] = { ATAPI_CAPACITY, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; |
|
char buf[8]; |
|
int bs; |
|
|
|
if (pf_atapi(pf, rc_cmd, 8, buf, "get capacity")) { |
|
pf->media_status = PF_NM; |
|
return; |
|
} |
|
set_capacity(pf->disk, xl(buf, 0) + 1); |
|
bs = xl(buf, 4); |
|
if (bs != 512) { |
|
set_capacity(pf->disk, 0); |
|
if (verbose) |
|
printk("%s: Drive %d, LUN %d," |
|
" unsupported block size %d\n", |
|
pf->name, pf->drive, pf->lun, bs); |
|
} |
|
} |
|
|
|
static int pf_identify(struct pf_unit *pf) |
|
{ |
|
int dt, s; |
|
char *ms[2] = { "master", "slave" }; |
|
char mf[10], id[18]; |
|
char id_cmd[12] = |
|
{ ATAPI_IDENTIFY, pf->lun << 5, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; |
|
char buf[36]; |
|
|
|
s = pf_atapi(pf, id_cmd, 36, buf, "identify"); |
|
if (s) |
|
return -1; |
|
|
|
dt = buf[0] & 0x1f; |
|
if ((dt != 0) && (dt != 7)) { |
|
if (verbose) |
|
printk("%s: Drive %d, LUN %d, unsupported type %d\n", |
|
pf->name, pf->drive, pf->lun, dt); |
|
return -1; |
|
} |
|
|
|
xs(buf, mf, 8, 8); |
|
xs(buf, id, 16, 16); |
|
|
|
pf->removable = (buf[1] & 0x80); |
|
|
|
pf_mode_sense(pf); |
|
pf_mode_sense(pf); |
|
pf_mode_sense(pf); |
|
|
|
pf_get_capacity(pf); |
|
|
|
printk("%s: %s %s, %s LUN %d, type %d", |
|
pf->name, mf, id, ms[pf->drive], pf->lun, dt); |
|
if (pf->removable) |
|
printk(", removable"); |
|
if (pf->media_status == PF_NM) |
|
printk(", no media\n"); |
|
else { |
|
if (pf->media_status == PF_RO) |
|
printk(", RO"); |
|
printk(", %llu blocks\n", |
|
(unsigned long long)get_capacity(pf->disk)); |
|
} |
|
return 0; |
|
} |
|
|
|
/* returns 0, with id set if drive is detected |
|
-1, if drive detection failed |
|
*/ |
|
static int pf_probe(struct pf_unit *pf) |
|
{ |
|
if (pf->drive == -1) { |
|
for (pf->drive = 0; pf->drive <= 1; pf->drive++) |
|
if (!pf_reset(pf)) { |
|
if (pf->lun != -1) |
|
return pf_identify(pf); |
|
else |
|
for (pf->lun = 0; pf->lun < 8; pf->lun++) |
|
if (!pf_identify(pf)) |
|
return 0; |
|
} |
|
} else { |
|
if (pf_reset(pf)) |
|
return -1; |
|
if (pf->lun != -1) |
|
return pf_identify(pf); |
|
for (pf->lun = 0; pf->lun < 8; pf->lun++) |
|
if (!pf_identify(pf)) |
|
return 0; |
|
} |
|
return -1; |
|
} |
|
|
|
static int pf_detect(void) |
|
{ |
|
struct pf_unit *pf = units; |
|
int k, unit; |
|
|
|
printk("%s: %s version %s, major %d, cluster %d, nice %d\n", |
|
name, name, PF_VERSION, major, cluster, nice); |
|
|
|
par_drv = pi_register_driver(name); |
|
if (!par_drv) { |
|
pr_err("failed to register %s driver\n", name); |
|
return -1; |
|
} |
|
k = 0; |
|
if (pf_drive_count == 0) { |
|
if (pi_init(pf->pi, 1, -1, -1, -1, -1, -1, pf_scratch, PI_PF, |
|
verbose, pf->name)) { |
|
if (!pf_probe(pf) && pf->disk) { |
|
pf->present = 1; |
|
k++; |
|
} else |
|
pi_release(pf->pi); |
|
} |
|
|
|
} else |
|
for (unit = 0; unit < PF_UNITS; unit++, pf++) { |
|
int *conf = *drives[unit]; |
|
if (!conf[D_PRT]) |
|
continue; |
|
if (pi_init(pf->pi, 0, conf[D_PRT], conf[D_MOD], |
|
conf[D_UNI], conf[D_PRO], conf[D_DLY], |
|
pf_scratch, PI_PF, verbose, pf->name)) { |
|
if (pf->disk && !pf_probe(pf)) { |
|
pf->present = 1; |
|
k++; |
|
} else |
|
pi_release(pf->pi); |
|
} |
|
} |
|
if (k) |
|
return 0; |
|
|
|
printk("%s: No ATAPI disk detected\n", name); |
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { |
|
if (!pf->disk) |
|
continue; |
|
blk_cleanup_disk(pf->disk); |
|
blk_mq_free_tag_set(&pf->tag_set); |
|
} |
|
pi_unregister_driver(par_drv); |
|
return -1; |
|
} |
|
|
|
/* The i/o request engine */ |
|
|
|
static int pf_start(struct pf_unit *pf, int cmd, int b, int c) |
|
{ |
|
int i; |
|
char io_cmd[12] = { cmd, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; |
|
|
|
for (i = 0; i < 4; i++) { |
|
io_cmd[5 - i] = b & 0xff; |
|
b = b >> 8; |
|
} |
|
|
|
io_cmd[8] = c & 0xff; |
|
io_cmd[7] = (c >> 8) & 0xff; |
|
|
|
i = pf_command(pf, io_cmd, c * 512, "start i/o"); |
|
|
|
mdelay(1); |
|
|
|
return i; |
|
} |
|
|
|
static int pf_ready(void) |
|
{ |
|
return (((status_reg(pf_current) & (STAT_BUSY | pf_mask)) == pf_mask)); |
|
} |
|
|
|
static int pf_queue; |
|
|
|
static int set_next_request(void) |
|
{ |
|
struct pf_unit *pf; |
|
int old_pos = pf_queue; |
|
|
|
do { |
|
pf = &units[pf_queue]; |
|
if (++pf_queue == PF_UNITS) |
|
pf_queue = 0; |
|
if (pf->present && !list_empty(&pf->rq_list)) { |
|
pf_req = list_first_entry(&pf->rq_list, struct request, |
|
queuelist); |
|
list_del_init(&pf_req->queuelist); |
|
blk_mq_start_request(pf_req); |
|
break; |
|
} |
|
} while (pf_queue != old_pos); |
|
|
|
return pf_req != NULL; |
|
} |
|
|
|
static void pf_end_request(blk_status_t err) |
|
{ |
|
if (!pf_req) |
|
return; |
|
if (!blk_update_request(pf_req, err, blk_rq_cur_bytes(pf_req))) { |
|
__blk_mq_end_request(pf_req, err); |
|
pf_req = NULL; |
|
} |
|
} |
|
|
|
static void pf_request(void) |
|
{ |
|
if (pf_busy) |
|
return; |
|
repeat: |
|
if (!pf_req && !set_next_request()) |
|
return; |
|
|
|
pf_current = pf_req->rq_disk->private_data; |
|
pf_block = blk_rq_pos(pf_req); |
|
pf_run = blk_rq_sectors(pf_req); |
|
pf_count = blk_rq_cur_sectors(pf_req); |
|
|
|
if (pf_block + pf_count > get_capacity(pf_req->rq_disk)) { |
|
pf_end_request(BLK_STS_IOERR); |
|
goto repeat; |
|
} |
|
|
|
pf_cmd = rq_data_dir(pf_req); |
|
pf_buf = bio_data(pf_req->bio); |
|
pf_retries = 0; |
|
|
|
pf_busy = 1; |
|
if (pf_cmd == READ) |
|
pi_do_claimed(pf_current->pi, do_pf_read); |
|
else if (pf_cmd == WRITE) |
|
pi_do_claimed(pf_current->pi, do_pf_write); |
|
else { |
|
pf_busy = 0; |
|
pf_end_request(BLK_STS_IOERR); |
|
goto repeat; |
|
} |
|
} |
|
|
|
static blk_status_t pf_queue_rq(struct blk_mq_hw_ctx *hctx, |
|
const struct blk_mq_queue_data *bd) |
|
{ |
|
struct pf_unit *pf = hctx->queue->queuedata; |
|
|
|
spin_lock_irq(&pf_spin_lock); |
|
list_add_tail(&bd->rq->queuelist, &pf->rq_list); |
|
pf_request(); |
|
spin_unlock_irq(&pf_spin_lock); |
|
|
|
return BLK_STS_OK; |
|
} |
|
|
|
static int pf_next_buf(void) |
|
{ |
|
unsigned long saved_flags; |
|
|
|
pf_count--; |
|
pf_run--; |
|
pf_buf += 512; |
|
pf_block++; |
|
if (!pf_run) |
|
return 1; |
|
if (!pf_count) { |
|
spin_lock_irqsave(&pf_spin_lock, saved_flags); |
|
pf_end_request(0); |
|
spin_unlock_irqrestore(&pf_spin_lock, saved_flags); |
|
if (!pf_req) |
|
return 1; |
|
pf_count = blk_rq_cur_sectors(pf_req); |
|
pf_buf = bio_data(pf_req->bio); |
|
} |
|
return 0; |
|
} |
|
|
|
static inline void next_request(blk_status_t err) |
|
{ |
|
unsigned long saved_flags; |
|
|
|
spin_lock_irqsave(&pf_spin_lock, saved_flags); |
|
pf_end_request(err); |
|
pf_busy = 0; |
|
pf_request(); |
|
spin_unlock_irqrestore(&pf_spin_lock, saved_flags); |
|
} |
|
|
|
/* detach from the calling context - in case the spinlock is held */ |
|
static void do_pf_read(void) |
|
{ |
|
ps_set_intr(do_pf_read_start, NULL, 0, nice); |
|
} |
|
|
|
static void do_pf_read_start(void) |
|
{ |
|
pf_busy = 1; |
|
|
|
if (pf_start(pf_current, ATAPI_READ_10, pf_block, pf_run)) { |
|
pi_disconnect(pf_current->pi); |
|
if (pf_retries < PF_MAX_RETRIES) { |
|
pf_retries++; |
|
pi_do_claimed(pf_current->pi, do_pf_read_start); |
|
return; |
|
} |
|
next_request(BLK_STS_IOERR); |
|
return; |
|
} |
|
pf_mask = STAT_DRQ; |
|
ps_set_intr(do_pf_read_drq, pf_ready, PF_TMO, nice); |
|
} |
|
|
|
static void do_pf_read_drq(void) |
|
{ |
|
while (1) { |
|
if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR, |
|
"read block", "completion") & STAT_ERR) { |
|
pi_disconnect(pf_current->pi); |
|
if (pf_retries < PF_MAX_RETRIES) { |
|
pf_req_sense(pf_current, 0); |
|
pf_retries++; |
|
pi_do_claimed(pf_current->pi, do_pf_read_start); |
|
return; |
|
} |
|
next_request(BLK_STS_IOERR); |
|
return; |
|
} |
|
pi_read_block(pf_current->pi, pf_buf, 512); |
|
if (pf_next_buf()) |
|
break; |
|
} |
|
pi_disconnect(pf_current->pi); |
|
next_request(0); |
|
} |
|
|
|
static void do_pf_write(void) |
|
{ |
|
ps_set_intr(do_pf_write_start, NULL, 0, nice); |
|
} |
|
|
|
static void do_pf_write_start(void) |
|
{ |
|
pf_busy = 1; |
|
|
|
if (pf_start(pf_current, ATAPI_WRITE_10, pf_block, pf_run)) { |
|
pi_disconnect(pf_current->pi); |
|
if (pf_retries < PF_MAX_RETRIES) { |
|
pf_retries++; |
|
pi_do_claimed(pf_current->pi, do_pf_write_start); |
|
return; |
|
} |
|
next_request(BLK_STS_IOERR); |
|
return; |
|
} |
|
|
|
while (1) { |
|
if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR, |
|
"write block", "data wait") & STAT_ERR) { |
|
pi_disconnect(pf_current->pi); |
|
if (pf_retries < PF_MAX_RETRIES) { |
|
pf_retries++; |
|
pi_do_claimed(pf_current->pi, do_pf_write_start); |
|
return; |
|
} |
|
next_request(BLK_STS_IOERR); |
|
return; |
|
} |
|
pi_write_block(pf_current->pi, pf_buf, 512); |
|
if (pf_next_buf()) |
|
break; |
|
} |
|
pf_mask = 0; |
|
ps_set_intr(do_pf_write_done, pf_ready, PF_TMO, nice); |
|
} |
|
|
|
static void do_pf_write_done(void) |
|
{ |
|
if (pf_wait(pf_current, STAT_BUSY, 0, "write block", "done") & STAT_ERR) { |
|
pi_disconnect(pf_current->pi); |
|
if (pf_retries < PF_MAX_RETRIES) { |
|
pf_retries++; |
|
pi_do_claimed(pf_current->pi, do_pf_write_start); |
|
return; |
|
} |
|
next_request(BLK_STS_IOERR); |
|
return; |
|
} |
|
pi_disconnect(pf_current->pi); |
|
next_request(0); |
|
} |
|
|
|
static int __init pf_init(void) |
|
{ /* preliminary initialisation */ |
|
struct pf_unit *pf; |
|
int unit; |
|
|
|
if (disable) |
|
return -EINVAL; |
|
|
|
pf_init_units(); |
|
|
|
if (pf_detect()) |
|
return -ENODEV; |
|
pf_busy = 0; |
|
|
|
if (register_blkdev(major, name)) { |
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { |
|
if (!pf->disk) |
|
continue; |
|
blk_cleanup_queue(pf->disk->queue); |
|
blk_mq_free_tag_set(&pf->tag_set); |
|
put_disk(pf->disk); |
|
} |
|
return -EBUSY; |
|
} |
|
|
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { |
|
struct gendisk *disk = pf->disk; |
|
|
|
if (!pf->present) |
|
continue; |
|
disk->private_data = pf; |
|
add_disk(disk); |
|
} |
|
return 0; |
|
} |
|
|
|
static void __exit pf_exit(void) |
|
{ |
|
struct pf_unit *pf; |
|
int unit; |
|
unregister_blkdev(major, name); |
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) { |
|
if (!pf->disk) |
|
continue; |
|
|
|
if (pf->present) |
|
del_gendisk(pf->disk); |
|
|
|
blk_cleanup_queue(pf->disk->queue); |
|
blk_mq_free_tag_set(&pf->tag_set); |
|
put_disk(pf->disk); |
|
|
|
if (pf->present) |
|
pi_release(pf->pi); |
|
} |
|
} |
|
|
|
MODULE_LICENSE("GPL"); |
|
module_init(pf_init) |
|
module_exit(pf_exit)
|
|
|