2 * Driver for the Micron P320 SSD
3 * Copyright (C) 2011 Micron Technology, Inc.
5 * Portions of this code were derived from works subjected to the
7 * Copyright (C) 2009 Integrated Device Technology, Inc.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
21 #include <linux/pci.h>
22 #include <linux/interrupt.h>
23 #include <linux/ata.h>
24 #include <linux/delay.h>
25 #include <linux/hdreg.h>
26 #include <linux/uaccess.h>
27 #include <linux/random.h>
28 #include <linux/smp.h>
29 #include <linux/compat.h>
31 #include <linux/genhd.h>
32 #include <linux/blkdev.h>
33 #include <linux/bio.h>
34 #include <linux/dma-mapping.h>
35 #include <linux/idr.h>
36 #include <../drivers/ata/ahci.h>
39 #define HW_CMD_SLOT_SZ (MTIP_MAX_COMMAND_SLOTS * 32)
40 #define HW_CMD_TBL_SZ (AHCI_CMD_TBL_HDR_SZ + (MTIP_MAX_SG * 16))
41 #define HW_CMD_TBL_AR_SZ (HW_CMD_TBL_SZ * MTIP_MAX_COMMAND_SLOTS)
42 #define HW_PORT_PRIV_DMA_SZ \
43 (HW_CMD_SLOT_SZ + HW_CMD_TBL_AR_SZ + AHCI_RX_FIS_SZ)
45 #define HOST_HSORG 0xFC
46 #define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
47 #define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
48 #define HSORG_HWREV 0xFF00
49 #define HSORG_STYLE 0x8
50 #define HSORG_SLOTGROUPS 0x7
52 #define PORT_COMMAND_ISSUE 0x38
53 #define PORT_SDBV 0x7C
55 #define PORT_OFFSET 0x100
56 #define PORT_MEM_SIZE 0x80
58 #define PORT_IRQ_ERR \
59 (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
60 PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
61 PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
63 #define PORT_IRQ_LEGACY \
64 (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
65 #define PORT_IRQ_HANDLED \
66 (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
67 PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
68 PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
69 #define DEF_PORT_IRQ \
70 (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)
73 #define MTIP_PRODUCT_UNKNOWN 0x00
74 #define MTIP_PRODUCT_ASICFPGA 0x11
76 /* Device instance number, incremented each time a device is probed. */
80 * Global variable used to hold the major block device number
81 * allocated in mtip_init().
85 static DEFINE_SPINLOCK(rssd_index_lock
);
86 static DEFINE_IDA(rssd_index_ida
);
89 struct mtip_compat_ide_task_request_s
{
92 ide_reg_valid_t out_flags
;
93 ide_reg_valid_t in_flags
;
96 compat_ulong_t out_size
;
97 compat_ulong_t in_size
;
101 static int mtip_exec_internal_command(struct mtip_port
*port
,
108 unsigned long timeout
);
111 * Obtain an empty command slot.
113 * This function needs to be reentrant since it could be called
114 * at the same time on multiple CPUs. The allocation of the
115 * command slot must be atomic.
117 * @port Pointer to the port data structure.
120 * >= 0 Index of command slot obtained.
121 * -1 No command slots available.
123 static int get_slot(struct mtip_port
*port
)
126 unsigned int num_command_slots
= port
->dd
->slot_groups
* 32;
129 * Try 10 times, because there is a small race here.
130 * that's ok, because it's still cheaper than a lock.
132 * Race: Since this section is not protected by lock, same bit
133 * could be chosen by different process contexts running in
134 * different processor. So instead of costly lock, we are going
137 for (i
= 0; i
< 10; i
++) {
138 slot
= find_next_zero_bit(port
->allocated
,
139 num_command_slots
, 1);
140 if ((slot
< num_command_slots
) &&
141 (!test_and_set_bit(slot
, port
->allocated
)))
144 dev_warn(&port
->dd
->pdev
->dev
, "Failed to get a tag.\n");
146 if (mtip_check_surprise_removal(port
->dd
->pdev
)) {
147 /* Device not present, clean outstanding commands */
148 mtip_command_cleanup(port
->dd
);
154 * Release a command slot.
156 * @port Pointer to the port data structure.
157 * @tag Tag of command to release
162 static inline void release_slot(struct mtip_port
*port
, int tag
)
164 smp_mb__before_clear_bit();
165 clear_bit(tag
, port
->allocated
);
166 smp_mb__after_clear_bit();
170 * Issue a command to the hardware.
172 * Set the appropriate bit in the s_active and Command Issue hardware
173 * registers, causing hardware command processing to begin.
175 * @port Pointer to the port structure.
176 * @tag The tag of the command to be issued.
181 static inline void mtip_issue_ncq_command(struct mtip_port
*port
, int tag
)
183 unsigned long flags
= 0;
185 atomic_set(&port
->commands
[tag
].active
, 1);
187 spin_lock_irqsave(&port
->cmd_issue_lock
, flags
);
189 writel((1 << MTIP_TAG_BIT(tag
)),
190 port
->s_active
[MTIP_TAG_INDEX(tag
)]);
191 writel((1 << MTIP_TAG_BIT(tag
)),
192 port
->cmd_issue
[MTIP_TAG_INDEX(tag
)]);
194 spin_unlock_irqrestore(&port
->cmd_issue_lock
, flags
);
198 * Called periodically to see if any read/write commands are
199 * taking too long to complete.
201 * @data Pointer to the PORT data structure.
206 void mtip_timeout_function(unsigned long int data
)
208 struct mtip_port
*port
= (struct mtip_port
*) data
;
209 struct host_to_dev_fis
*fis
;
210 struct mtip_cmd
*command
;
211 int tag
, cmdto_cnt
= 0;
212 unsigned int bit
, group
;
213 unsigned int num_command_slots
= port
->dd
->slot_groups
* 32;
218 if (atomic_read(&port
->dd
->resumeflag
) == true) {
219 mod_timer(&port
->cmd_timer
,
220 jiffies
+ msecs_to_jiffies(30000));
224 for (tag
= 0; tag
< num_command_slots
; tag
++) {
226 * Skip internal command slot as it has
227 * its own timeout mechanism
229 if (tag
== MTIP_TAG_INTERNAL
)
232 if (atomic_read(&port
->commands
[tag
].active
) &&
233 (time_after(jiffies
, port
->commands
[tag
].comp_time
))) {
237 command
= &port
->commands
[tag
];
238 fis
= (struct host_to_dev_fis
*) command
->command
;
240 dev_warn(&port
->dd
->pdev
->dev
,
241 "Timeout for command tag %d\n", tag
);
245 atomic_inc(&port
->dd
->eh_active
);
248 * Clear the completed bit. This should prevent
249 * any interrupt handlers from trying to retire
252 writel(1 << bit
, port
->completed
[group
]);
254 /* Call the async completion callback. */
255 if (likely(command
->async_callback
))
256 command
->async_callback(command
->async_data
,
258 command
->async_callback
= NULL
;
259 command
->comp_func
= NULL
;
261 /* Unmap the DMA scatter list entries */
262 dma_unmap_sg(&port
->dd
->pdev
->dev
,
264 command
->scatter_ents
,
268 * Clear the allocated bit and active tag for the
271 atomic_set(&port
->commands
[tag
].active
, 0);
272 release_slot(port
, tag
);
279 dev_warn(&port
->dd
->pdev
->dev
,
280 "%d commands timed out: restarting port",
282 mtip_restart_port(port
);
283 atomic_dec(&port
->dd
->eh_active
);
286 /* Restart the timer */
287 mod_timer(&port
->cmd_timer
,
288 jiffies
+ msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD
));
292 * IO completion function.
294 * This completion function is called by the driver ISR when a
295 * command that was issued by the kernel completes. It first calls the
296 * asynchronous completion function which normally calls back into the block
297 * layer passing the asynchronous callback data, then unmaps the
298 * scatter list associated with the completed command, and finally
299 * clears the allocated bit associated with the completed command.
301 * @port Pointer to the port data structure.
302 * @tag Tag of the command.
303 * @data Pointer to driver_data.
304 * @status Completion status.
309 static void mtip_async_complete(struct mtip_port
*port
,
314 struct mtip_cmd
*command
;
315 struct driver_data
*dd
= data
;
316 int cb_status
= status
? -EIO
: 0;
318 if (unlikely(!dd
) || unlikely(!port
))
321 command
= &port
->commands
[tag
];
323 if (unlikely(status
== PORT_IRQ_TF_ERR
)) {
324 dev_warn(&port
->dd
->pdev
->dev
,
325 "Command tag %d failed due to TFE\n", tag
);
328 /* Upper layer callback */
329 if (likely(command
->async_callback
))
330 command
->async_callback(command
->async_data
, cb_status
);
332 command
->async_callback
= NULL
;
333 command
->comp_func
= NULL
;
335 /* Unmap the DMA scatter list entries */
336 dma_unmap_sg(&dd
->pdev
->dev
,
338 command
->scatter_ents
,
341 /* Clear the allocated and active bits for the command */
342 atomic_set(&port
->commands
[tag
].active
, 0);
343 release_slot(port
, tag
);
349 * Internal command completion callback function.
351 * This function is normally called by the driver ISR when an internal
352 * command completed. This function signals the command completion by
353 * calling complete().
355 * @port Pointer to the port data structure.
356 * @tag Tag of the command that has completed.
357 * @data Pointer to a completion structure.
358 * @status Completion status.
363 static void mtip_completion(struct mtip_port
*port
,
368 struct mtip_cmd
*command
= &port
->commands
[tag
];
369 struct completion
*waiting
= data
;
370 if (unlikely(status
== PORT_IRQ_TF_ERR
))
371 dev_warn(&port
->dd
->pdev
->dev
,
372 "Internal command %d completed with TFE\n", tag
);
374 command
->async_callback
= NULL
;
375 command
->comp_func
= NULL
;
381 * Enable/disable the reception of FIS
383 * @port Pointer to the port data structure
384 * @enable 1 to enable, 0 to disable
387 * Previous state: 1 enabled, 0 disabled
389 static int mtip_enable_fis(struct mtip_port
*port
, int enable
)
393 /* enable FIS reception */
394 tmp
= readl(port
->mmio
+ PORT_CMD
);
396 writel(tmp
| PORT_CMD_FIS_RX
, port
->mmio
+ PORT_CMD
);
398 writel(tmp
& ~PORT_CMD_FIS_RX
, port
->mmio
+ PORT_CMD
);
401 readl(port
->mmio
+ PORT_CMD
);
403 return (((tmp
& PORT_CMD_FIS_RX
) == PORT_CMD_FIS_RX
));
407 * Enable/disable the DMA engine
409 * @port Pointer to the port data structure
410 * @enable 1 to enable, 0 to disable
413 * Previous state: 1 enabled, 0 disabled.
415 static int mtip_enable_engine(struct mtip_port
*port
, int enable
)
419 /* enable FIS reception */
420 tmp
= readl(port
->mmio
+ PORT_CMD
);
422 writel(tmp
| PORT_CMD_START
, port
->mmio
+ PORT_CMD
);
424 writel(tmp
& ~PORT_CMD_START
, port
->mmio
+ PORT_CMD
);
426 readl(port
->mmio
+ PORT_CMD
);
427 return (((tmp
& PORT_CMD_START
) == PORT_CMD_START
));
431 * Enables the port DMA engine and FIS reception.
436 static inline void mtip_start_port(struct mtip_port
*port
)
438 /* Enable FIS reception */
439 mtip_enable_fis(port
, 1);
441 /* Enable the DMA engine */
442 mtip_enable_engine(port
, 1);
446 * Deinitialize a port by disabling port interrupts, the DMA engine,
449 * @port Pointer to the port structure
454 static inline void mtip_deinit_port(struct mtip_port
*port
)
456 /* Disable interrupts on this port */
457 writel(0, port
->mmio
+ PORT_IRQ_MASK
);
459 /* Disable the DMA engine */
460 mtip_enable_engine(port
, 0);
462 /* Disable FIS reception */
463 mtip_enable_fis(port
, 0);
469 * This function deinitializes the port by calling mtip_deinit_port() and
470 * then initializes it by setting the command header and RX FIS addresses,
471 * clearing the SError register and any pending port interrupts before
472 * re-enabling the default set of port interrupts.
474 * @port Pointer to the port structure.
479 static void mtip_init_port(struct mtip_port
*port
)
482 mtip_deinit_port(port
);
484 /* Program the command list base and FIS base addresses */
485 if (readl(port
->dd
->mmio
+ HOST_CAP
) & HOST_CAP_64
) {
486 writel((port
->command_list_dma
>> 16) >> 16,
487 port
->mmio
+ PORT_LST_ADDR_HI
);
488 writel((port
->rxfis_dma
>> 16) >> 16,
489 port
->mmio
+ PORT_FIS_ADDR_HI
);
492 writel(port
->command_list_dma
& 0xffffffff,
493 port
->mmio
+ PORT_LST_ADDR
);
494 writel(port
->rxfis_dma
& 0xffffffff, port
->mmio
+ PORT_FIS_ADDR
);
497 writel(readl(port
->mmio
+ PORT_SCR_ERR
), port
->mmio
+ PORT_SCR_ERR
);
499 /* reset the completed registers.*/
500 for (i
= 0; i
< port
->dd
->slot_groups
; i
++)
501 writel(0xFFFFFFFF, port
->completed
[i
]);
503 /* Clear any pending interrupts for this port */
504 writel(readl(port
->mmio
+ PORT_IRQ_STAT
), port
->mmio
+ PORT_IRQ_STAT
);
506 /* Enable port interrupts */
507 writel(DEF_PORT_IRQ
, port
->mmio
+ PORT_IRQ_MASK
);
511 * Reset the HBA (without sleeping)
513 * Just like hba_reset, except does not call sleep, so can be
514 * run from interrupt/tasklet context.
516 * @dd Pointer to the driver data structure.
519 * 0 The reset was successful.
520 * -1 The HBA Reset bit did not clear.
522 int hba_reset_nosleep(struct driver_data
*dd
)
524 unsigned long timeout
;
526 /* Chip quirk: quiesce any chip function */
529 /* Set the reset bit */
530 writel(HOST_RESET
, dd
->mmio
+ HOST_CTL
);
533 readl(dd
->mmio
+ HOST_CTL
);
536 * Wait 10ms then spin for up to 1 second
537 * waiting for reset acknowledgement
539 timeout
= jiffies
+ msecs_to_jiffies(1000);
541 while ((readl(dd
->mmio
+ HOST_CTL
) & HOST_RESET
)
542 && time_before(jiffies
, timeout
))
545 if (readl(dd
->mmio
+ HOST_CTL
) & HOST_RESET
)
554 * @port Pointer to the port data structure.
559 void mtip_restart_port(struct mtip_port
*port
)
561 unsigned long timeout
;
563 /* Disable the DMA engine */
564 mtip_enable_engine(port
, 0);
566 /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
567 timeout
= jiffies
+ msecs_to_jiffies(500);
568 while ((readl(port
->mmio
+ PORT_CMD
) & PORT_CMD_LIST_ON
)
569 && time_before(jiffies
, timeout
))
573 * Chip quirk: escalate to hba reset if
574 * PxCMD.CR not clear after 500 ms
576 if (readl(port
->mmio
+ PORT_CMD
) & PORT_CMD_LIST_ON
) {
577 dev_warn(&port
->dd
->pdev
->dev
,
578 "PxCMD.CR not clear, escalating reset\n");
580 if (hba_reset_nosleep(port
->dd
))
581 dev_err(&port
->dd
->pdev
->dev
,
582 "HBA reset escalation failed.\n");
584 /* 30 ms delay before com reset to quiesce chip */
588 dev_warn(&port
->dd
->pdev
->dev
, "Issuing COM reset\n");
591 writel(readl(port
->mmio
+ PORT_SCR_CTL
) |
592 1, port
->mmio
+ PORT_SCR_CTL
);
593 readl(port
->mmio
+ PORT_SCR_CTL
);
595 /* Wait 1 ms to quiesce chip function */
596 timeout
= jiffies
+ msecs_to_jiffies(1);
597 while (time_before(jiffies
, timeout
))
600 /* Clear PxSCTL.DET */
601 writel(readl(port
->mmio
+ PORT_SCR_CTL
) & ~1,
602 port
->mmio
+ PORT_SCR_CTL
);
603 readl(port
->mmio
+ PORT_SCR_CTL
);
605 /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
606 timeout
= jiffies
+ msecs_to_jiffies(500);
607 while (((readl(port
->mmio
+ PORT_SCR_STAT
) & 0x01) == 0)
608 && time_before(jiffies
, timeout
))
611 if ((readl(port
->mmio
+ PORT_SCR_STAT
) & 0x01) == 0)
612 dev_warn(&port
->dd
->pdev
->dev
,
613 "COM reset failed\n");
615 /* Clear SError, the PxSERR.DIAG.x should be set so clear it */
616 writel(readl(port
->mmio
+ PORT_SCR_ERR
), port
->mmio
+ PORT_SCR_ERR
);
618 /* Enable the DMA engine */
619 mtip_enable_engine(port
, 1);
623 * Helper function for tag logging
625 static void print_tags(struct driver_data
*dd
,
627 unsigned long *tagbits
)
629 unsigned int tag
, count
= 0;
631 for (tag
= 0; tag
< (dd
->slot_groups
) * 32; tag
++) {
632 if (test_bit(tag
, tagbits
))
636 dev_info(&dd
->pdev
->dev
, "%s [%i tags]\n", msg
, count
);
642 * @dd Pointer to the DRIVER_DATA structure.
647 static void mtip_handle_tfe(struct driver_data
*dd
)
649 int group
, tag
, bit
, reissue
;
650 struct mtip_port
*port
;
651 struct mtip_cmd
*command
;
653 struct host_to_dev_fis
*fis
;
654 unsigned long tagaccum
[SLOTBITS_IN_LONGS
];
656 dev_warn(&dd
->pdev
->dev
, "Taskfile error\n");
660 /* Stop the timer to prevent command timeouts. */
661 del_timer(&port
->cmd_timer
);
664 atomic_inc(&dd
->eh_active
);
666 /* Loop through all the groups */
667 for (group
= 0; group
< dd
->slot_groups
; group
++) {
668 completed
= readl(port
->completed
[group
]);
670 /* clear completed status register in the hardware.*/
671 writel(completed
, port
->completed
[group
]);
673 /* clear the tag accumulator */
674 memset(tagaccum
, 0, SLOTBITS_IN_LONGS
* sizeof(long));
676 /* Process successfully completed commands */
677 for (bit
= 0; bit
< 32 && completed
; bit
++) {
678 if (!(completed
& (1<<bit
)))
680 tag
= (group
<< 5) + bit
;
682 /* Skip the internal command slot */
683 if (tag
== MTIP_TAG_INTERNAL
)
686 command
= &port
->commands
[tag
];
687 if (likely(command
->comp_func
)) {
688 set_bit(tag
, tagaccum
);
689 atomic_set(&port
->commands
[tag
].active
, 0);
690 command
->comp_func(port
,
695 dev_err(&port
->dd
->pdev
->dev
,
696 "Missing completion func for tag %d",
698 if (mtip_check_surprise_removal(dd
->pdev
)) {
699 mtip_command_cleanup(dd
);
700 /* don't proceed further */
706 print_tags(dd
, "TFE tags completed:", tagaccum
);
708 /* Restart the port */
710 mtip_restart_port(port
);
712 /* clear the tag accumulator */
713 memset(tagaccum
, 0, SLOTBITS_IN_LONGS
* sizeof(long));
715 /* Loop through all the groups */
716 for (group
= 0; group
< dd
->slot_groups
; group
++) {
717 for (bit
= 0; bit
< 32; bit
++) {
719 tag
= (group
<< 5) + bit
;
721 /* If the active bit is set re-issue the command */
722 if (atomic_read(&port
->commands
[tag
].active
) == 0)
725 fis
= (struct host_to_dev_fis
*)
726 port
->commands
[tag
].command
;
728 /* Should re-issue? */
729 if (tag
== MTIP_TAG_INTERNAL
||
730 fis
->command
== ATA_CMD_SET_FEATURES
)
734 * First check if this command has
735 * exceeded its retries.
738 (port
->commands
[tag
].retries
-- > 0)) {
740 set_bit(tag
, tagaccum
);
742 /* Update the timeout value. */
743 port
->commands
[tag
].comp_time
=
744 jiffies
+ msecs_to_jiffies(
745 MTIP_NCQ_COMMAND_TIMEOUT_MS
);
746 /* Re-issue the command. */
747 mtip_issue_ncq_command(port
, tag
);
752 /* Retire a command that will not be reissued */
753 dev_warn(&port
->dd
->pdev
->dev
,
754 "retiring tag %d\n", tag
);
755 atomic_set(&port
->commands
[tag
].active
, 0);
757 if (port
->commands
[tag
].comp_func
)
758 port
->commands
[tag
].comp_func(
761 port
->commands
[tag
].comp_data
,
764 dev_warn(&port
->dd
->pdev
->dev
,
765 "Bad completion for tag %d\n",
769 print_tags(dd
, "TFE tags reissued:", tagaccum
);
771 /* Decrement eh_active */
772 atomic_dec(&dd
->eh_active
);
774 mod_timer(&port
->cmd_timer
,
775 jiffies
+ msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD
));
779 * Handle a set device bits interrupt
781 static inline void mtip_process_sdbf(struct driver_data
*dd
)
783 struct mtip_port
*port
= dd
->port
;
786 struct mtip_cmd
*command
;
788 /* walk all bits in all slot groups */
789 for (group
= 0; group
< dd
->slot_groups
; group
++) {
790 completed
= readl(port
->completed
[group
]);
792 /* clear completed status register in the hardware.*/
793 writel(completed
, port
->completed
[group
]);
795 /* Process completed commands. */
797 (bit
< 32) && completed
;
798 bit
++, completed
>>= 1) {
799 if (completed
& 0x01) {
800 tag
= (group
<< 5) | bit
;
802 /* skip internal command slot. */
803 if (unlikely(tag
== MTIP_TAG_INTERNAL
))
806 command
= &port
->commands
[tag
];
808 /* make internal callback */
809 if (likely(command
->comp_func
)) {
816 dev_warn(&dd
->pdev
->dev
,
821 if (mtip_check_surprise_removal(
823 mtip_command_cleanup(dd
);
833 * Process legacy pio and d2h interrupts
835 static inline void mtip_process_legacy(struct driver_data
*dd
, u32 port_stat
)
837 struct mtip_port
*port
= dd
->port
;
838 struct mtip_cmd
*cmd
= &port
->commands
[MTIP_TAG_INTERNAL
];
840 if (port
->internal_cmd_in_progress
&&
842 !(readl(port
->cmd_issue
[MTIP_TAG_INTERNAL
])
843 & (1 << MTIP_TAG_INTERNAL
))) {
844 if (cmd
->comp_func
) {
853 dev_warn(&dd
->pdev
->dev
, "IRQ status 0x%x ignored.\n", port_stat
);
859 * Demux and handle errors
861 static inline void mtip_process_errors(struct driver_data
*dd
, u32 port_stat
)
863 if (likely(port_stat
& (PORT_IRQ_TF_ERR
| PORT_IRQ_IF_ERR
)))
866 if (unlikely(port_stat
& PORT_IRQ_CONNECT
)) {
867 dev_warn(&dd
->pdev
->dev
,
868 "Clearing PxSERR.DIAG.x\n");
869 writel((1 << 26), dd
->port
->mmio
+ PORT_SCR_ERR
);
872 if (unlikely(port_stat
& PORT_IRQ_PHYRDY
)) {
873 dev_warn(&dd
->pdev
->dev
,
874 "Clearing PxSERR.DIAG.n\n");
875 writel((1 << 16), dd
->port
->mmio
+ PORT_SCR_ERR
);
878 if (unlikely(port_stat
& ~PORT_IRQ_HANDLED
)) {
879 dev_warn(&dd
->pdev
->dev
,
880 "Port stat errors %x unhandled\n",
881 (port_stat
& ~PORT_IRQ_HANDLED
));
885 static inline irqreturn_t
mtip_handle_irq(struct driver_data
*data
)
887 struct driver_data
*dd
= (struct driver_data
*) data
;
888 struct mtip_port
*port
= dd
->port
;
889 u32 hba_stat
, port_stat
;
892 hba_stat
= readl(dd
->mmio
+ HOST_IRQ_STAT
);
896 /* Acknowledge the interrupt status on the port.*/
897 port_stat
= readl(port
->mmio
+ PORT_IRQ_STAT
);
898 writel(port_stat
, port
->mmio
+ PORT_IRQ_STAT
);
900 /* Demux port status */
901 if (likely(port_stat
& PORT_IRQ_SDB_FIS
))
902 mtip_process_sdbf(dd
);
904 if (unlikely(port_stat
& PORT_IRQ_ERR
)) {
905 if (unlikely(mtip_check_surprise_removal(dd
->pdev
))) {
906 mtip_command_cleanup(dd
);
907 /* don't proceed further */
911 mtip_process_errors(dd
, port_stat
& PORT_IRQ_ERR
);
914 if (unlikely(port_stat
& PORT_IRQ_LEGACY
))
915 mtip_process_legacy(dd
, port_stat
& PORT_IRQ_LEGACY
);
918 /* acknowledge interrupt */
919 writel(hba_stat
, dd
->mmio
+ HOST_IRQ_STAT
);
925 * Wrapper for mtip_handle_irq
926 * (ignores return code)
928 static void mtip_tasklet(unsigned long data
)
930 mtip_handle_irq((struct driver_data
*) data
);
934 * HBA interrupt subroutine.
937 * @instance Pointer to the driver data structure.
940 * IRQ_HANDLED A HBA interrupt was pending and handled.
941 * IRQ_NONE This interrupt was not for the HBA.
943 static irqreturn_t
mtip_irq_handler(int irq
, void *instance
)
945 struct driver_data
*dd
= instance
;
946 tasklet_schedule(&dd
->tasklet
);
950 static void mtip_issue_non_ncq_command(struct mtip_port
*port
, int tag
)
952 atomic_set(&port
->commands
[tag
].active
, 1);
953 writel(1 << MTIP_TAG_BIT(tag
),
954 port
->cmd_issue
[MTIP_TAG_INDEX(tag
)]);
958 * Wait for port to quiesce
960 * @port Pointer to port data structure
961 * @timeout Max duration to wait (ms)
965 * -EBUSY Commands still active
967 static int mtip_quiesce_io(struct mtip_port
*port
, unsigned long timeout
)
970 unsigned int n
, active
;
972 to
= jiffies
+ msecs_to_jiffies(timeout
);
975 * Ignore s_active bit 0 of array element 0.
976 * This bit will always be set
978 active
= readl(port
->s_active
[0]) & 0xfffffffe;
979 for (n
= 1; n
< port
->dd
->slot_groups
; n
++)
980 active
|= readl(port
->s_active
[n
]);
986 } while (time_before(jiffies
, to
));
988 return active
? -EBUSY
: 0;
992 * Execute an internal command and wait for the completion.
994 * @port Pointer to the port data structure.
995 * @fis Pointer to the FIS that describes the command.
996 * @fisLen Length in WORDS of the FIS.
997 * @buffer DMA accessible for command data.
998 * @bufLen Length, in bytes, of the data buffer.
999 * @opts Command header options, excluding the FIS length
1000 * and the number of PRD entries.
1001 * @timeout Time in ms to wait for the command to complete.
1004 * 0 Command completed successfully.
1005 * -EFAULT The buffer address is not correctly aligned.
1006 * -EBUSY Internal command or other IO in progress.
1007 * -EAGAIN Time out waiting for command to complete.
1009 static int mtip_exec_internal_command(struct mtip_port
*port
,
1016 unsigned long timeout
)
1018 struct mtip_cmd_sg
*command_sg
;
1019 DECLARE_COMPLETION_ONSTACK(wait
);
1021 struct mtip_cmd
*int_cmd
= &port
->commands
[MTIP_TAG_INTERNAL
];
1023 /* Make sure the buffer is 8 byte aligned. This is asic specific. */
1024 if (buffer
& 0x00000007) {
1025 dev_err(&port
->dd
->pdev
->dev
,
1026 "SG buffer is not 8 byte aligned\n");
1030 /* Only one internal command should be running at a time */
1031 if (test_and_set_bit(MTIP_TAG_INTERNAL
, port
->allocated
)) {
1032 dev_warn(&port
->dd
->pdev
->dev
,
1033 "Internal command already active\n");
1036 port
->internal_cmd_in_progress
= 1;
1038 if (atomic
== GFP_KERNEL
) {
1039 /* wait for io to complete if non atomic */
1040 if (mtip_quiesce_io(port
, 5000) < 0) {
1041 dev_warn(&port
->dd
->pdev
->dev
,
1042 "Failed to quiesce IO\n");
1043 release_slot(port
, MTIP_TAG_INTERNAL
);
1044 port
->internal_cmd_in_progress
= 0;
1048 /* Set the completion function and data for the command. */
1049 int_cmd
->comp_data
= &wait
;
1050 int_cmd
->comp_func
= mtip_completion
;
1053 /* Clear completion - we're going to poll */
1054 int_cmd
->comp_data
= NULL
;
1055 int_cmd
->comp_func
= NULL
;
1058 /* Copy the command to the command table */
1059 memcpy(int_cmd
->command
, fis
, fisLen
*4);
1061 /* Populate the SG list */
1062 int_cmd
->command_header
->opts
=
1063 cpu_to_le32(opts
| fisLen
);
1065 command_sg
= int_cmd
->command
+ AHCI_CMD_TBL_HDR_SZ
;
1067 command_sg
->info
= cpu_to_le32((bufLen
-1) & 0x3fffff);
1068 command_sg
->dba
= cpu_to_le32(buffer
& 0xffffffff);
1069 command_sg
->dba_upper
= cpu_to_le32((buffer
>> 16) >> 16);
1071 int_cmd
->command_header
->opts
|= cpu_to_le32((1 << 16));
1074 /* Populate the command header */
1075 int_cmd
->command_header
->byte_count
= 0;
1077 /* Issue the command to the hardware */
1078 mtip_issue_non_ncq_command(port
, MTIP_TAG_INTERNAL
);
1080 /* Poll if atomic, wait_for_completion otherwise */
1081 if (atomic
== GFP_KERNEL
) {
1082 /* Wait for the command to complete or timeout. */
1083 if (wait_for_completion_timeout(
1085 msecs_to_jiffies(timeout
)) == 0) {
1086 dev_err(&port
->dd
->pdev
->dev
,
1087 "Internal command did not complete [%d]\n",
1092 if (readl(port
->cmd_issue
[MTIP_TAG_INTERNAL
])
1093 & (1 << MTIP_TAG_INTERNAL
)) {
1094 dev_warn(&port
->dd
->pdev
->dev
,
1095 "Retiring internal command but CI is 1.\n");
1099 /* Spin for <timeout> checking if command still outstanding */
1100 timeout
= jiffies
+ msecs_to_jiffies(timeout
);
1103 port
->cmd_issue
[MTIP_TAG_INTERNAL
])
1104 & (1 << MTIP_TAG_INTERNAL
))
1105 && time_before(jiffies
, timeout
))
1108 if (readl(port
->cmd_issue
[MTIP_TAG_INTERNAL
])
1109 & (1 << MTIP_TAG_INTERNAL
)) {
1110 dev_err(&port
->dd
->pdev
->dev
,
1111 "Internal command did not complete [%d]\n",
1117 /* Clear the allocated and active bits for the internal command. */
1118 atomic_set(&int_cmd
->active
, 0);
1119 release_slot(port
, MTIP_TAG_INTERNAL
);
1120 port
->internal_cmd_in_progress
= 0;
1126 * Byte-swap ATA ID strings.
1128 * ATA identify data contains strings in byte-swapped 16-bit words.
1129 * They must be swapped (on all architectures) to be usable as C strings.
1130 * This function swaps bytes in-place.
1132 * @buf The buffer location of the string
1133 * @len The number of bytes to swap
1138 static inline void ata_swap_string(u16
*buf
, unsigned int len
)
1141 for (i
= 0; i
< (len
/2); i
++)
1142 be16_to_cpus(&buf
[i
]);
1146 * Request the device identity information.
1148 * If a user space buffer is not specified, i.e. is NULL, the
1149 * identify information is still read from the drive and placed
1150 * into the identify data buffer (@e port->identify) in the
1151 * port data structure.
1152 * When the identify buffer contains valid identify information @e
1153 * port->identify_valid is non-zero.
1155 * @port Pointer to the port structure.
1156 * @user_buffer A user space buffer where the identify data should be
1160 * 0 Command completed successfully.
1161 * -EFAULT An error occurred while coping data to the user buffer.
1162 * -1 Command failed.
1164 static int mtip_get_identify(struct mtip_port
*port
, void __user
*user_buffer
)
1167 struct host_to_dev_fis fis
;
1169 down_write(&port
->dd
->internal_sem
);
1171 /* Build the FIS. */
1172 memset(&fis
, 0, sizeof(struct host_to_dev_fis
));
1175 fis
.command
= ATA_CMD_ID_ATA
;
1177 /* Set the identify information as invalid. */
1178 port
->identify_valid
= 0;
1180 /* Clear the identify information. */
1181 memset(port
->identify
, 0, sizeof(u16
) * ATA_ID_WORDS
);
1183 /* Execute the command. */
1184 if (mtip_exec_internal_command(port
,
1188 sizeof(u16
) * ATA_ID_WORDS
,
1191 MTIP_INTERNAL_COMMAND_TIMEOUT_MS
)
1198 * Perform any necessary byte-swapping. Yes, the kernel does in fact
1199 * perform field-sensitive swapping on the string fields.
1200 * See the kernel use of ata_id_string() for proof of this.
1202 #ifdef __LITTLE_ENDIAN
1203 ata_swap_string(port
->identify
+ 27, 40); /* model string*/
1204 ata_swap_string(port
->identify
+ 23, 8); /* firmware string*/
1205 ata_swap_string(port
->identify
+ 10, 20); /* serial# string*/
1209 for (i
= 0; i
< ATA_ID_WORDS
; i
++)
1210 port
->identify
[i
] = le16_to_cpu(port
->identify
[i
]);
1214 /* Set the identify buffer as valid. */
1215 port
->identify_valid
= 1;
1221 ATA_ID_WORDS
* sizeof(u16
))) {
1228 up_write(&port
->dd
->internal_sem
);
1233 * Issue a standby immediate command to the device.
1235 * @port Pointer to the port structure.
1238 * 0 Command was executed successfully.
1239 * -1 An error occurred while executing the command.
1241 static int mtip_standby_immediate(struct mtip_port
*port
)
1244 struct host_to_dev_fis fis
;
1246 down_write(&port
->dd
->internal_sem
);
1248 /* Build the FIS. */
1249 memset(&fis
, 0, sizeof(struct host_to_dev_fis
));
1252 fis
.command
= ATA_CMD_STANDBYNOW1
;
1254 /* Execute the command. Use a 15-second timeout for large drives. */
1255 rv
= mtip_exec_internal_command(port
,
1264 up_write(&port
->dd
->internal_sem
);
1270 * Get the drive capacity.
1272 * @dd Pointer to the device data structure.
1273 * @sectors Pointer to the variable that will receive the sector count.
1276 * 1 Capacity was returned successfully.
1277 * 0 The identify information is invalid.
1279 bool mtip_hw_get_capacity(struct driver_data
*dd
, sector_t
*sectors
)
1281 struct mtip_port
*port
= dd
->port
;
1282 u64 total
, raw0
, raw1
, raw2
, raw3
;
1283 raw0
= port
->identify
[100];
1284 raw1
= port
->identify
[101];
1285 raw2
= port
->identify
[102];
1286 raw3
= port
->identify
[103];
1287 total
= raw0
| raw1
<<16 | raw2
<<32 | raw3
<<48;
1289 return (bool) !!port
->identify_valid
;
1295 * Resets the HBA by setting the HBA Reset bit in the Global
1296 * HBA Control register. After setting the HBA Reset bit the
1297 * function waits for 1 second before reading the HBA Reset
1298 * bit to make sure it has cleared. If HBA Reset is not clear
1299 * an error is returned. Cannot be used in non-blockable
1302 * @dd Pointer to the driver data structure.
1305 * 0 The reset was successful.
1306 * -1 The HBA Reset bit did not clear.
1308 static int mtip_hba_reset(struct driver_data
*dd
)
1310 mtip_deinit_port(dd
->port
);
1312 /* Set the reset bit */
1313 writel(HOST_RESET
, dd
->mmio
+ HOST_CTL
);
1316 readl(dd
->mmio
+ HOST_CTL
);
1318 /* Wait for reset to clear */
1321 /* Check the bit has cleared */
1322 if (readl(dd
->mmio
+ HOST_CTL
) & HOST_RESET
) {
1323 dev_err(&dd
->pdev
->dev
,
1324 "Reset bit did not clear.\n");
1332 * Display the identify command data.
1334 * @port Pointer to the port data structure.
1339 static void mtip_dump_identify(struct mtip_port
*port
)
1342 unsigned short revid
;
1345 if (!port
->identify_valid
)
1348 strlcpy(cbuf
, (char *)(port
->identify
+10), 21);
1349 dev_info(&port
->dd
->pdev
->dev
,
1350 "Serial No.: %s\n", cbuf
);
1352 strlcpy(cbuf
, (char *)(port
->identify
+23), 9);
1353 dev_info(&port
->dd
->pdev
->dev
,
1354 "Firmware Ver.: %s\n", cbuf
);
1356 strlcpy(cbuf
, (char *)(port
->identify
+27), 41);
1357 dev_info(&port
->dd
->pdev
->dev
, "Model: %s\n", cbuf
);
1359 if (mtip_hw_get_capacity(port
->dd
, §ors
))
1360 dev_info(&port
->dd
->pdev
->dev
,
1361 "Capacity: %llu sectors (%llu MB)\n",
1363 ((u64
)sectors
) * ATA_SECT_SIZE
>> 20);
1365 pci_read_config_word(port
->dd
->pdev
, PCI_REVISION_ID
, &revid
);
1366 switch (revid
& 0xff) {
1368 strlcpy(cbuf
, "A0", 3);
1371 strlcpy(cbuf
, "A2", 3);
1374 strlcpy(cbuf
, "?", 2);
1377 dev_info(&port
->dd
->pdev
->dev
,
1378 "Card Type: %s\n", cbuf
);
1382 * Map the commands scatter list into the command table.
1384 * @command Pointer to the command.
1385 * @nents Number of scatter list entries.
1390 static inline void fill_command_sg(struct driver_data
*dd
,
1391 struct mtip_cmd
*command
,
1395 unsigned int dma_len
;
1396 struct mtip_cmd_sg
*command_sg
;
1397 struct scatterlist
*sg
= command
->sg
;
1399 command_sg
= command
->command
+ AHCI_CMD_TBL_HDR_SZ
;
1401 for (n
= 0; n
< nents
; n
++) {
1402 dma_len
= sg_dma_len(sg
);
1403 if (dma_len
> 0x400000)
1404 dev_err(&dd
->pdev
->dev
,
1405 "DMA segment length truncated\n");
1406 command_sg
->info
= cpu_to_le32((dma_len
-1) & 0x3fffff);
1407 #if (BITS_PER_LONG == 64)
1408 *((unsigned long *) &command_sg
->dba
) =
1409 cpu_to_le64(sg_dma_address(sg
));
1411 command_sg
->dba
= cpu_to_le32(sg_dma_address(sg
));
1412 command_sg
->dba_upper
=
1413 cpu_to_le32((sg_dma_address(sg
) >> 16) >> 16);
1421 * @brief Execute a drive command.
1423 * return value 0 The command completed successfully.
1424 * return value -1 An error occurred while executing the command.
1426 int exec_drive_task(struct mtip_port
*port
, u8
*command
)
1428 struct host_to_dev_fis fis
;
1429 struct host_to_dev_fis
*reply
= (port
->rxfis
+ RX_FIS_D2H_REG
);
1431 /* Lock the internal command semaphore. */
1432 down_write(&port
->dd
->internal_sem
);
1434 /* Build the FIS. */
1435 memset(&fis
, 0, sizeof(struct host_to_dev_fis
));
1438 fis
.command
= command
[0];
1439 fis
.features
= command
[1];
1440 fis
.sect_count
= command
[2];
1441 fis
.sector
= command
[3];
1442 fis
.cyl_low
= command
[4];
1443 fis
.cyl_hi
= command
[5];
1444 fis
.device
= command
[6] & ~0x10; /* Clear the dev bit*/
1447 dbg_printk(MTIP_DRV_NAME
"%s: User Command: cmd %x, feat %x, "
1448 "nsect %x, sect %x, lcyl %x, "
1449 "hcyl %x, sel %x\n",
1459 /* Execute the command. */
1460 if (mtip_exec_internal_command(port
,
1467 MTIP_IOCTL_COMMAND_TIMEOUT_MS
) < 0) {
1468 up_write(&port
->dd
->internal_sem
);
1472 command
[0] = reply
->command
; /* Status*/
1473 command
[1] = reply
->features
; /* Error*/
1474 command
[4] = reply
->cyl_low
;
1475 command
[5] = reply
->cyl_hi
;
1477 dbg_printk(MTIP_DRV_NAME
"%s: Completion Status: stat %x, "
1478 "err %x , cyl_lo %x cyl_hi %x\n",
1485 up_write(&port
->dd
->internal_sem
);
1490 * @brief Execute a drive command.
1492 * @param port Pointer to the port data structure.
1493 * @param command Pointer to the user specified command parameters.
1494 * @param user_buffer Pointer to the user space buffer where read sector
1495 * data should be copied.
1497 * return value 0 The command completed successfully.
1498 * return value -EFAULT An error occurred while copying the completion
1499 * data to the user space buffer.
1500 * return value -1 An error occurred while executing the command.
1502 int exec_drive_command(struct mtip_port
*port
, u8
*command
,
1503 void __user
*user_buffer
)
1505 struct host_to_dev_fis fis
;
1506 struct host_to_dev_fis
*reply
= (port
->rxfis
+ RX_FIS_D2H_REG
);
1508 /* Lock the internal command semaphore. */
1509 down_write(&port
->dd
->internal_sem
);
1511 /* Build the FIS. */
1512 memset(&fis
, 0, sizeof(struct host_to_dev_fis
));
1515 fis
.command
= command
[0];
1516 fis
.features
= command
[2];
1517 fis
.sect_count
= command
[3];
1518 if (fis
.command
== ATA_CMD_SMART
) {
1519 fis
.sector
= command
[1];
1524 dbg_printk(MTIP_DRV_NAME
1525 "%s: User Command: cmd %x, sect %x, "
1526 "feat %x, sectcnt %x\n",
1533 memset(port
->sector_buffer
, 0x00, ATA_SECT_SIZE
);
1535 /* Execute the command. */
1536 if (mtip_exec_internal_command(port
,
1539 port
->sector_buffer_dma
,
1540 (command
[3] != 0) ? ATA_SECT_SIZE
: 0,
1543 MTIP_IOCTL_COMMAND_TIMEOUT_MS
)
1545 up_write(&port
->dd
->internal_sem
);
1549 /* Collect the completion status. */
1550 command
[0] = reply
->command
; /* Status*/
1551 command
[1] = reply
->features
; /* Error*/
1552 command
[2] = command
[3];
1554 dbg_printk(MTIP_DRV_NAME
1555 "%s: Completion Status: stat %x, "
1562 if (user_buffer
&& command
[3]) {
1563 if (copy_to_user(user_buffer
,
1564 port
->sector_buffer
,
1565 ATA_SECT_SIZE
* command
[3])) {
1566 up_write(&port
->dd
->internal_sem
);
1571 up_write(&port
->dd
->internal_sem
);
1576 * Indicates whether a command has a single sector payload.
1578 * @command passed to the device to perform the certain event.
1579 * @features passed to the device to perform the certain event.
1582 * 1 command is one that always has a single sector payload,
1583 * regardless of the value in the Sector Count field.
1587 static unsigned int implicit_sector(unsigned char command
,
1588 unsigned char features
)
1590 unsigned int rv
= 0;
1592 /* list of commands that have an implicit sector count of 1 */
1605 if (features
== 0x03)
1609 if ((features
== 0xD0) || (features
== 0xD1))
1613 if ((features
== 0xC2) || (features
== 0xC3))
1621 * Executes a taskfile
1622 * See ide_taskfile_ioctl() for derivation
1624 static int exec_drive_taskfile(struct driver_data
*dd
,
1626 ide_task_request_t
*req_task
,
1629 struct host_to_dev_fis fis
;
1630 struct host_to_dev_fis
*reply
;
1633 dma_addr_t outbuf_dma
= 0;
1634 dma_addr_t inbuf_dma
= 0;
1635 dma_addr_t dma_buffer
= 0;
1637 unsigned int taskin
= 0;
1638 unsigned int taskout
= 0;
1640 unsigned int timeout
= MTIP_IOCTL_COMMAND_TIMEOUT_MS
;
1641 unsigned int force_single_sector
;
1642 unsigned int transfer_size
;
1643 unsigned long task_file_data
;
1644 int intotal
= outtotal
+ req_task
->out_size
;
1646 taskout
= req_task
->out_size
;
1647 taskin
= req_task
->in_size
;
1648 /* 130560 = 512 * 0xFF*/
1649 if (taskin
> 130560 || taskout
> 130560) {
1655 outbuf
= kzalloc(taskout
, GFP_KERNEL
);
1656 if (outbuf
== NULL
) {
1660 if (copy_from_user(outbuf
, buf
+ outtotal
, taskout
)) {
1664 outbuf_dma
= pci_map_single(dd
->pdev
,
1668 if (outbuf_dma
== 0) {
1672 dma_buffer
= outbuf_dma
;
1676 inbuf
= kzalloc(taskin
, GFP_KERNEL
);
1677 if (inbuf
== NULL
) {
1682 if (copy_from_user(inbuf
, buf
+ intotal
, taskin
)) {
1686 inbuf_dma
= pci_map_single(dd
->pdev
,
1688 taskin
, DMA_FROM_DEVICE
);
1689 if (inbuf_dma
== 0) {
1693 dma_buffer
= inbuf_dma
;
1696 /* only supports PIO and non-data commands from this ioctl. */
1697 switch (req_task
->data_phase
) {
1699 nsect
= taskout
/ ATA_SECT_SIZE
;
1700 reply
= (dd
->port
->rxfis
+ RX_FIS_PIO_SETUP
);
1703 reply
= (dd
->port
->rxfis
+ RX_FIS_PIO_SETUP
);
1705 case TASKFILE_NO_DATA
:
1706 reply
= (dd
->port
->rxfis
+ RX_FIS_D2H_REG
);
1713 /* Lock the internal command semaphore. */
1714 down_write(&dd
->internal_sem
);
1716 /* Build the FIS. */
1717 memset(&fis
, 0, sizeof(struct host_to_dev_fis
));
1721 fis
.command
= req_task
->io_ports
[7];
1722 fis
.features
= req_task
->io_ports
[1];
1723 fis
.sect_count
= req_task
->io_ports
[2];
1724 fis
.lba_low
= req_task
->io_ports
[3];
1725 fis
.lba_mid
= req_task
->io_ports
[4];
1726 fis
.lba_hi
= req_task
->io_ports
[5];
1727 /* Clear the dev bit*/
1728 fis
.device
= req_task
->io_ports
[6] & ~0x10;
1730 if ((req_task
->in_flags
.all
== 0) && (req_task
->out_flags
.all
& 1)) {
1731 req_task
->in_flags
.all
=
1732 IDE_TASKFILE_STD_IN_FLAGS
|
1733 (IDE_HOB_STD_IN_FLAGS
<< 8);
1734 fis
.lba_low_ex
= req_task
->hob_ports
[3];
1735 fis
.lba_mid_ex
= req_task
->hob_ports
[4];
1736 fis
.lba_hi_ex
= req_task
->hob_ports
[5];
1737 fis
.features_ex
= req_task
->hob_ports
[1];
1738 fis
.sect_cnt_ex
= req_task
->hob_ports
[2];
1741 req_task
->in_flags
.all
= IDE_TASKFILE_STD_IN_FLAGS
;
1744 force_single_sector
= implicit_sector(fis
.command
, fis
.features
);
1746 if ((taskin
|| taskout
) && (!fis
.sect_count
)) {
1748 fis
.sect_count
= nsect
;
1750 if (!force_single_sector
) {
1751 dev_warn(&dd
->pdev
->dev
,
1752 "data movement but "
1753 "sect_count is 0\n");
1754 up_write(&dd
->internal_sem
);
1761 dbg_printk(MTIP_DRV_NAME
1762 "taskfile: cmd %x, feat %x, nsect %x,"
1763 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
1773 switch (fis
.command
) {
1774 case 0x92: /* Change timeout for Download Microcode to 60 seconds.*/
1777 case 0xf4: /* Change timeout for Security Erase Unit to 4 minutes.*/
1780 case 0xe0: /* Change timeout for standby immediate to 10 seconds.*/
1783 case 0xf7: /* Change timeout for vendor unique command to 10 secs */
1786 case 0xfa: /* Change timeout for vendor unique command to 10 secs */
1790 timeout
= MTIP_IOCTL_COMMAND_TIMEOUT_MS
;
1794 /* Determine the correct transfer size.*/
1795 if (force_single_sector
)
1796 transfer_size
= ATA_SECT_SIZE
;
1798 transfer_size
= ATA_SECT_SIZE
* fis
.sect_count
;
1800 /* Execute the command.*/
1801 if (mtip_exec_internal_command(dd
->port
,
1809 up_write(&dd
->internal_sem
);
1814 task_file_data
= readl(dd
->port
->mmio
+PORT_TFDATA
);
1816 if ((req_task
->data_phase
== TASKFILE_IN
) && !(task_file_data
& 1)) {
1817 reply
= dd
->port
->rxfis
+ RX_FIS_PIO_SETUP
;
1818 req_task
->io_ports
[7] = reply
->control
;
1820 reply
= dd
->port
->rxfis
+ RX_FIS_D2H_REG
;
1821 req_task
->io_ports
[7] = reply
->command
;
1824 /* reclaim the DMA buffers.*/
1826 pci_unmap_single(dd
->pdev
, inbuf_dma
,
1827 taskin
, DMA_FROM_DEVICE
);
1829 pci_unmap_single(dd
->pdev
, outbuf_dma
,
1830 taskout
, DMA_TO_DEVICE
);
1834 /* return the ATA registers to the caller.*/
1835 req_task
->io_ports
[1] = reply
->features
;
1836 req_task
->io_ports
[2] = reply
->sect_count
;
1837 req_task
->io_ports
[3] = reply
->lba_low
;
1838 req_task
->io_ports
[4] = reply
->lba_mid
;
1839 req_task
->io_ports
[5] = reply
->lba_hi
;
1840 req_task
->io_ports
[6] = reply
->device
;
1842 if (req_task
->out_flags
.all
& 1) {
1844 req_task
->hob_ports
[3] = reply
->lba_low_ex
;
1845 req_task
->hob_ports
[4] = reply
->lba_mid_ex
;
1846 req_task
->hob_ports
[5] = reply
->lba_hi_ex
;
1847 req_task
->hob_ports
[1] = reply
->features_ex
;
1848 req_task
->hob_ports
[2] = reply
->sect_cnt_ex
;
1851 /* Com rest after secure erase or lowlevel format */
1852 if (((fis
.command
== 0xF4) ||
1853 ((fis
.command
== 0xFC) &&
1854 (fis
.features
== 0x27 || fis
.features
== 0x72 ||
1855 fis
.features
== 0x62 || fis
.features
== 0x26))) &&
1856 !(reply
->command
& 1)) {
1857 mtip_restart_port(dd
->port
);
1860 dbg_printk(MTIP_DRV_NAME
1861 "%s: Completion: stat %x,"
1862 "err %x, sect_cnt %x, lbalo %x,"
1863 "lbamid %x, lbahi %x, dev %x\n",
1865 req_task
->io_ports
[7],
1866 req_task
->io_ports
[1],
1867 req_task
->io_ports
[2],
1868 req_task
->io_ports
[3],
1869 req_task
->io_ports
[4],
1870 req_task
->io_ports
[5],
1871 req_task
->io_ports
[6]);
1873 up_write(&dd
->internal_sem
);
1876 if (copy_to_user(buf
+ outtotal
, outbuf
, taskout
)) {
1882 if (copy_to_user(buf
+ intotal
, inbuf
, taskin
)) {
1889 pci_unmap_single(dd
->pdev
, inbuf_dma
,
1890 taskin
, DMA_FROM_DEVICE
);
1892 pci_unmap_single(dd
->pdev
, outbuf_dma
,
1893 taskout
, DMA_TO_DEVICE
);
1901 * Handle IOCTL calls from the Block Layer.
1903 * This function is called by the Block Layer when it receives an IOCTL
1904 * command that it does not understand. If the IOCTL command is not supported
1905 * this function returns -ENOTTY.
1907 * @dd Pointer to the driver data structure.
1908 * @cmd IOCTL command passed from the Block Layer.
1909 * @arg IOCTL argument passed from the Block Layer.
1912 * 0 The IOCTL completed successfully.
1913 * -ENOTTY The specified command is not supported.
1914 * -EFAULT An error occurred copying data to a user space buffer.
1915 * -EIO An error occurred while executing the command.
1917 static int mtip_hw_ioctl(struct driver_data
*dd
, unsigned int cmd
,
1921 case HDIO_GET_IDENTITY
:
1922 if (mtip_get_identify(dd
->port
, (void __user
*) arg
) < 0) {
1923 dev_warn(&dd
->pdev
->dev
,
1924 "Unable to read identity\n");
1929 case HDIO_DRIVE_CMD
:
1931 u8 drive_command
[4];
1933 /* Copy the user command info to our buffer. */
1934 if (copy_from_user(drive_command
,
1935 (void __user
*) arg
,
1936 sizeof(drive_command
)))
1939 /* Execute the drive command. */
1940 if (exec_drive_command(dd
->port
,
1942 (void __user
*) (arg
+4)))
1945 /* Copy the status back to the users buffer. */
1946 if (copy_to_user((void __user
*) arg
,
1948 sizeof(drive_command
)))
1953 case HDIO_DRIVE_TASK
:
1955 u8 drive_command
[7];
1957 /* Copy the user command info to our buffer. */
1958 if (copy_from_user(drive_command
,
1959 (void __user
*) arg
,
1960 sizeof(drive_command
)))
1963 /* Execute the drive command. */
1964 if (exec_drive_task(dd
->port
, drive_command
))
1967 /* Copy the status back to the users buffer. */
1968 if (copy_to_user((void __user
*) arg
,
1970 sizeof(drive_command
)))
1975 case HDIO_DRIVE_TASKFILE
: {
1976 ide_task_request_t req_task
;
1979 if (copy_from_user(&req_task
, (void __user
*) arg
,
1983 outtotal
= sizeof(req_task
);
1985 ret
= exec_drive_taskfile(dd
, (void __user
*) arg
,
1986 &req_task
, outtotal
);
1988 if (copy_to_user((void __user
*) arg
, &req_task
, sizeof(req_task
)))
2001 * Submit an IO to the hw
2003 * This function is called by the block layer to issue an io
2004 * to the device. Upon completion, the callback function will
2005 * be called with the data parameter passed as the callback data.
2007 * @dd Pointer to the driver data structure.
2008 * @start First sector to read.
2009 * @nsect Number of sectors to read.
2010 * @nents Number of entries in scatter list for the read command.
2011 * @tag The tag of this read command.
2012 * @callback Pointer to the function that should be called
2013 * when the read completes.
2014 * @data Callback data passed to the callback function
2015 * when the read completes.
2016 * @barrier If non-zero, this command must be completed before
2017 * issuing any other commands.
2018 * @dir Direction (read or write)
2023 void mtip_hw_submit_io(struct driver_data
*dd
,
2033 struct host_to_dev_fis
*fis
;
2034 struct mtip_port
*port
= dd
->port
;
2035 struct mtip_cmd
*command
= &port
->commands
[tag
];
2037 /* Map the scatter list for DMA access */
2039 nents
= dma_map_sg(&dd
->pdev
->dev
, command
->sg
,
2040 nents
, DMA_FROM_DEVICE
);
2042 nents
= dma_map_sg(&dd
->pdev
->dev
, command
->sg
,
2043 nents
, DMA_TO_DEVICE
);
2045 command
->scatter_ents
= nents
;
2048 * The number of retries for this command before it is
2049 * reported as a failure to the upper layers.
2051 command
->retries
= MTIP_MAX_RETRIES
;
2054 fis
= command
->command
;
2058 (dir
== READ
? ATA_CMD_FPDMA_READ
: ATA_CMD_FPDMA_WRITE
);
2059 *((unsigned int *) &fis
->lba_low
) = (start
& 0xffffff);
2060 *((unsigned int *) &fis
->lba_low_ex
) = ((start
>> 24) & 0xffffff);
2061 fis
->device
= 1 << 6;
2063 fis
->device
|= FUA_BIT
;
2064 fis
->features
= nsect
& 0xff;
2065 fis
->features_ex
= (nsect
>> 8) & 0xff;
2066 fis
->sect_count
= ((tag
<< 3) | (tag
>> 5));
2067 fis
->sect_cnt_ex
= 0;
2071 fill_command_sg(dd
, command
, nents
);
2073 /* Populate the command header */
2074 command
->command_header
->opts
= cpu_to_le32(
2075 (nents
<< 16) | 5 | AHCI_CMD_PREFETCH
);
2076 command
->command_header
->byte_count
= 0;
2079 * Set the completion function and data for the command
2080 * within this layer.
2082 command
->comp_data
= dd
;
2083 command
->comp_func
= mtip_async_complete
;
2084 command
->direction
= (dir
== READ
? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
2087 * Set the completion function and data for the command passed
2088 * from the upper layer.
2090 command
->async_data
= data
;
2091 command
->async_callback
= callback
;
2094 * Lock used to prevent this command from being issued
2095 * if an internal command is in progress.
2097 down_read(&port
->dd
->internal_sem
);
2099 /* Issue the command to the hardware */
2100 mtip_issue_ncq_command(port
, tag
);
2102 /* Set the command's timeout value.*/
2103 port
->commands
[tag
].comp_time
= jiffies
+ msecs_to_jiffies(
2104 MTIP_NCQ_COMMAND_TIMEOUT_MS
);
2106 up_read(&port
->dd
->internal_sem
);
2110 * Release a command slot.
2112 * @dd Pointer to the driver data structure.
2118 void mtip_hw_release_scatterlist(struct driver_data
*dd
, int tag
)
2120 release_slot(dd
->port
, tag
);
2124 * Obtain a command slot and return its associated scatter list.
2126 * @dd Pointer to the driver data structure.
2127 * @tag Pointer to an int that will receive the allocated command
2131 * Pointer to the scatter list for the allocated command slot
2132 * or NULL if no command slots are available.
2134 struct scatterlist
*mtip_hw_get_scatterlist(struct driver_data
*dd
,
2138 * It is possible that, even with this semaphore, a thread
2139 * may think that no command slots are available. Therefore, we
2140 * need to make an attempt to get_slot().
2142 down(&dd
->port
->cmd_slot
);
2143 *tag
= get_slot(dd
->port
);
2145 if (unlikely(*tag
< 0))
2148 return dd
->port
->commands
[*tag
].sg
;
2152 * Sysfs register/status dump.
2154 * @dev Pointer to the device structure, passed by the kernrel.
2155 * @attr Pointer to the device_attribute structure passed by the kernel.
2156 * @buf Pointer to the char buffer that will receive the stats info.
2159 * The size, in bytes, of the data copied into buf.
2161 static ssize_t
hw_show_registers(struct device
*dev
,
2162 struct device_attribute
*attr
,
2165 u32 group_allocated
;
2166 struct driver_data
*dd
= dev_to_disk(dev
)->private_data
;
2170 size
+= sprintf(&buf
[size
], "%s:\ns_active:\n", __func__
);
2172 for (n
= 0; n
< dd
->slot_groups
; n
++)
2173 size
+= sprintf(&buf
[size
], "0x%08x\n",
2174 readl(dd
->port
->s_active
[n
]));
2176 size
+= sprintf(&buf
[size
], "Command Issue:\n");
2178 for (n
= 0; n
< dd
->slot_groups
; n
++)
2179 size
+= sprintf(&buf
[size
], "0x%08x\n",
2180 readl(dd
->port
->cmd_issue
[n
]));
2182 size
+= sprintf(&buf
[size
], "Allocated:\n");
2184 for (n
= 0; n
< dd
->slot_groups
; n
++) {
2185 if (sizeof(long) > sizeof(u32
))
2187 dd
->port
->allocated
[n
/2] >> (32*(n
&1));
2189 group_allocated
= dd
->port
->allocated
[n
];
2190 size
+= sprintf(&buf
[size
], "0x%08x\n",
2194 size
+= sprintf(&buf
[size
], "completed:\n");
2196 for (n
= 0; n
< dd
->slot_groups
; n
++)
2197 size
+= sprintf(&buf
[size
], "0x%08x\n",
2198 readl(dd
->port
->completed
[n
]));
2200 size
+= sprintf(&buf
[size
], "PORT_IRQ_STAT 0x%08x\n",
2201 readl(dd
->port
->mmio
+ PORT_IRQ_STAT
));
2202 size
+= sprintf(&buf
[size
], "HOST_IRQ_STAT 0x%08x\n",
2203 readl(dd
->mmio
+ HOST_IRQ_STAT
));
2207 static DEVICE_ATTR(registers
, S_IRUGO
, hw_show_registers
, NULL
);
2210 * Create the sysfs related attributes.
2212 * @dd Pointer to the driver data structure.
2213 * @kobj Pointer to the kobj for the block device.
2216 * 0 Operation completed successfully.
2217 * -EINVAL Invalid parameter.
2219 int mtip_hw_sysfs_init(struct driver_data
*dd
, struct kobject
*kobj
)
2224 if (sysfs_create_file(kobj
, &dev_attr_registers
.attr
))
2225 dev_warn(&dd
->pdev
->dev
,
2226 "Error creating registers sysfs entry\n");
2231 * Remove the sysfs related attributes.
2233 * @dd Pointer to the driver data structure.
2234 * @kobj Pointer to the kobj for the block device.
2237 * 0 Operation completed successfully.
2238 * -EINVAL Invalid parameter.
2240 int mtip_hw_sysfs_exit(struct driver_data
*dd
, struct kobject
*kobj
)
2245 sysfs_remove_file(kobj
, &dev_attr_registers
.attr
);
2251 * Perform any init/resume time hardware setup
2253 * @dd Pointer to the driver data structure.
2258 static inline void hba_setup(struct driver_data
*dd
)
2261 hwdata
= readl(dd
->mmio
+ HOST_HSORG
);
2263 /* interrupt bug workaround: use only 1 IS bit.*/
2265 HSORG_DISABLE_SLOTGRP_INTR
|
2266 HSORG_DISABLE_SLOTGRP_PXIS
,
2267 dd
->mmio
+ HOST_HSORG
);
2271 * Detect the details of the product, and store anything needed
2272 * into the driver data structure. This includes product type and
2273 * version and number of slot groups.
2275 * @dd Pointer to the driver data structure.
2280 static void mtip_detect_product(struct driver_data
*dd
)
2283 unsigned int rev
, slotgroups
;
2286 * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2288 * [15:8] hardware/software interface rev#
2289 * [ 3] asic-style interface
2290 * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2292 hwdata
= readl(dd
->mmio
+ HOST_HSORG
);
2294 dd
->product_type
= MTIP_PRODUCT_UNKNOWN
;
2295 dd
->slot_groups
= 1;
2298 dd
->product_type
= MTIP_PRODUCT_ASICFPGA
;
2299 rev
= (hwdata
& HSORG_HWREV
) >> 8;
2300 slotgroups
= (hwdata
& HSORG_SLOTGROUPS
) + 1;
2301 dev_info(&dd
->pdev
->dev
,
2302 "ASIC-FPGA design, HS rev 0x%x, "
2303 "%i slot groups [%i slots]\n",
2308 if (slotgroups
> MTIP_MAX_SLOT_GROUPS
) {
2309 dev_warn(&dd
->pdev
->dev
,
2310 "Warning: driver only supports "
2311 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS
);
2312 slotgroups
= MTIP_MAX_SLOT_GROUPS
;
2314 dd
->slot_groups
= slotgroups
;
2318 dev_warn(&dd
->pdev
->dev
, "Unrecognized product id\n");
2322 * Blocking wait for FTL rebuild to complete
2324 * @dd Pointer to the DRIVER_DATA structure.
2327 * 0 FTL rebuild completed successfully
2328 * -EFAULT FTL rebuild error/timeout/interruption
2330 static int mtip_ftl_rebuild_poll(struct driver_data
*dd
)
2332 unsigned long timeout
, cnt
= 0, start
;
2334 dev_warn(&dd
->pdev
->dev
,
2335 "FTL rebuild in progress. Polling for completion.\n");
2338 dd
->ftlrebuildflag
= 1;
2339 timeout
= jiffies
+ msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS
);
2342 #ifdef CONFIG_HOTPLUG
2343 if (mtip_check_surprise_removal(dd
->pdev
))
2346 if (mtip_get_identify(dd
->port
, NULL
) < 0)
2349 if (*(dd
->port
->identify
+ MTIP_FTL_REBUILD_OFFSET
) ==
2350 MTIP_FTL_REBUILD_MAGIC
) {
2352 /* Print message every 3 minutes */
2354 dev_warn(&dd
->pdev
->dev
,
2355 "FTL rebuild in progress (%d secs).\n",
2356 jiffies_to_msecs(jiffies
- start
) / 1000);
2360 dev_warn(&dd
->pdev
->dev
,
2361 "FTL rebuild complete (%d secs).\n",
2362 jiffies_to_msecs(jiffies
- start
) / 1000);
2363 dd
->ftlrebuildflag
= 0;
2367 } while (time_before(jiffies
, timeout
));
2369 /* Check for timeout */
2370 if (dd
->ftlrebuildflag
) {
2371 dev_err(&dd
->pdev
->dev
,
2372 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2373 jiffies_to_msecs(jiffies
- start
) / 1000);
2381 * Called once for each card.
2383 * @dd Pointer to the driver data structure.
2386 * 0 on success, else an error code.
2388 int mtip_hw_init(struct driver_data
*dd
)
2392 unsigned int num_command_slots
;
2394 dd
->mmio
= pcim_iomap_table(dd
->pdev
)[MTIP_ABAR
];
2396 mtip_detect_product(dd
);
2397 if (dd
->product_type
== MTIP_PRODUCT_UNKNOWN
) {
2401 num_command_slots
= dd
->slot_groups
* 32;
2406 * Initialize the internal semaphore
2407 * Use a rw semaphore to enable prioritization of
2408 * mgmnt ioctl traffic during heavy IO load
2410 init_rwsem(&dd
->internal_sem
);
2412 tasklet_init(&dd
->tasklet
, mtip_tasklet
, (unsigned long)dd
);
2414 dd
->port
= kzalloc(sizeof(struct mtip_port
), GFP_KERNEL
);
2416 dev_err(&dd
->pdev
->dev
,
2417 "Memory allocation: port structure\n");
2421 /* Counting semaphore to track command slot usage */
2422 sema_init(&dd
->port
->cmd_slot
, num_command_slots
- 1);
2424 /* Spinlock to prevent concurrent issue */
2425 spin_lock_init(&dd
->port
->cmd_issue_lock
);
2427 /* Set the port mmio base address. */
2428 dd
->port
->mmio
= dd
->mmio
+ PORT_OFFSET
;
2431 /* Allocate memory for the command list. */
2432 dd
->port
->command_list
=
2433 dmam_alloc_coherent(&dd
->pdev
->dev
,
2434 HW_PORT_PRIV_DMA_SZ
+ (ATA_SECT_SIZE
* 2),
2435 &dd
->port
->command_list_dma
,
2437 if (!dd
->port
->command_list
) {
2438 dev_err(&dd
->pdev
->dev
,
2439 "Memory allocation: command list\n");
2444 /* Clear the memory we have allocated. */
2445 memset(dd
->port
->command_list
,
2447 HW_PORT_PRIV_DMA_SZ
+ (ATA_SECT_SIZE
* 2));
2449 /* Setup the addresse of the RX FIS. */
2450 dd
->port
->rxfis
= dd
->port
->command_list
+ HW_CMD_SLOT_SZ
;
2451 dd
->port
->rxfis_dma
= dd
->port
->command_list_dma
+ HW_CMD_SLOT_SZ
;
2453 /* Setup the address of the command tables. */
2454 dd
->port
->command_table
= dd
->port
->rxfis
+ AHCI_RX_FIS_SZ
;
2455 dd
->port
->command_tbl_dma
= dd
->port
->rxfis_dma
+ AHCI_RX_FIS_SZ
;
2457 /* Setup the address of the identify data. */
2458 dd
->port
->identify
= dd
->port
->command_table
+
2460 dd
->port
->identify_dma
= dd
->port
->command_tbl_dma
+
2463 /* Setup the address of the sector buffer. */
2464 dd
->port
->sector_buffer
= (void *) dd
->port
->identify
+ ATA_SECT_SIZE
;
2465 dd
->port
->sector_buffer_dma
= dd
->port
->identify_dma
+ ATA_SECT_SIZE
;
2467 /* Point the command headers at the command tables. */
2468 for (i
= 0; i
< num_command_slots
; i
++) {
2469 dd
->port
->commands
[i
].command_header
=
2470 dd
->port
->command_list
+
2471 (sizeof(struct mtip_cmd_hdr
) * i
);
2472 dd
->port
->commands
[i
].command_header_dma
=
2473 dd
->port
->command_list_dma
+
2474 (sizeof(struct mtip_cmd_hdr
) * i
);
2476 dd
->port
->commands
[i
].command
=
2477 dd
->port
->command_table
+ (HW_CMD_TBL_SZ
* i
);
2478 dd
->port
->commands
[i
].command_dma
=
2479 dd
->port
->command_tbl_dma
+ (HW_CMD_TBL_SZ
* i
);
2481 if (readl(dd
->mmio
+ HOST_CAP
) & HOST_CAP_64
)
2482 dd
->port
->commands
[i
].command_header
->ctbau
=
2484 (dd
->port
->commands
[i
].command_dma
>> 16) >> 16);
2485 dd
->port
->commands
[i
].command_header
->ctba
= cpu_to_le32(
2486 dd
->port
->commands
[i
].command_dma
& 0xffffffff);
2489 * If this is not done, a bug is reported by the stock
2490 * FC11 i386. Due to the fact that it has lots of kernel
2491 * debugging enabled.
2493 sg_init_table(dd
->port
->commands
[i
].sg
, MTIP_MAX_SG
);
2495 /* Mark all commands as currently inactive.*/
2496 atomic_set(&dd
->port
->commands
[i
].active
, 0);
2499 /* Setup the pointers to the extended s_active and CI registers. */
2500 for (i
= 0; i
< dd
->slot_groups
; i
++) {
2501 dd
->port
->s_active
[i
] =
2502 dd
->port
->mmio
+ i
*0x80 + PORT_SCR_ACT
;
2503 dd
->port
->cmd_issue
[i
] =
2504 dd
->port
->mmio
+ i
*0x80 + PORT_COMMAND_ISSUE
;
2505 dd
->port
->completed
[i
] =
2506 dd
->port
->mmio
+ i
*0x80 + PORT_SDBV
;
2509 /* Reset the HBA. */
2510 if (mtip_hba_reset(dd
) < 0) {
2511 dev_err(&dd
->pdev
->dev
,
2512 "Card did not reset within timeout\n");
2517 mtip_init_port(dd
->port
);
2518 mtip_start_port(dd
->port
);
2520 /* Setup the ISR and enable interrupts. */
2521 rv
= devm_request_irq(&dd
->pdev
->dev
,
2525 dev_driver_string(&dd
->pdev
->dev
),
2529 dev_err(&dd
->pdev
->dev
,
2530 "Unable to allocate IRQ %d\n", dd
->pdev
->irq
);
2534 /* Enable interrupts on the HBA. */
2535 writel(readl(dd
->mmio
+ HOST_CTL
) | HOST_IRQ_EN
,
2536 dd
->mmio
+ HOST_CTL
);
2538 init_timer(&dd
->port
->cmd_timer
);
2539 dd
->port
->cmd_timer
.data
= (unsigned long int) dd
->port
;
2540 dd
->port
->cmd_timer
.function
= mtip_timeout_function
;
2541 mod_timer(&dd
->port
->cmd_timer
,
2542 jiffies
+ msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD
));
2544 if (mtip_get_identify(dd
->port
, NULL
) < 0) {
2548 mtip_dump_identify(dd
->port
);
2550 if (*(dd
->port
->identify
+ MTIP_FTL_REBUILD_OFFSET
) ==
2551 MTIP_FTL_REBUILD_MAGIC
) {
2552 return mtip_ftl_rebuild_poll(dd
);
2557 del_timer_sync(&dd
->port
->cmd_timer
);
2559 /* Disable interrupts on the HBA. */
2560 writel(readl(dd
->mmio
+ HOST_CTL
) & ~HOST_IRQ_EN
,
2561 dd
->mmio
+ HOST_CTL
);
2563 /*Release the IRQ. */
2564 devm_free_irq(&dd
->pdev
->dev
, dd
->pdev
->irq
, dd
);
2567 mtip_deinit_port(dd
->port
);
2569 /* Free the command/command header memory. */
2570 dmam_free_coherent(&dd
->pdev
->dev
,
2571 HW_PORT_PRIV_DMA_SZ
+ (ATA_SECT_SIZE
* 2),
2572 dd
->port
->command_list
,
2573 dd
->port
->command_list_dma
);
2575 /* Free the memory allocated for the for structure. */
2582 * Called to deinitialize an interface.
2584 * @dd Pointer to the driver data structure.
2589 int mtip_hw_exit(struct driver_data
*dd
)
2592 * Send standby immediate (E0h) to the drive so that it
2595 if (atomic_read(&dd
->drv_cleanup_done
) != true) {
2597 mtip_standby_immediate(dd
->port
);
2599 /* de-initialize the port. */
2600 mtip_deinit_port(dd
->port
);
2602 /* Disable interrupts on the HBA. */
2603 writel(readl(dd
->mmio
+ HOST_CTL
) & ~HOST_IRQ_EN
,
2604 dd
->mmio
+ HOST_CTL
);
2607 del_timer_sync(&dd
->port
->cmd_timer
);
2609 /* Stop the bottom half tasklet. */
2610 tasklet_kill(&dd
->tasklet
);
2612 /* Release the IRQ. */
2613 devm_free_irq(&dd
->pdev
->dev
, dd
->pdev
->irq
, dd
);
2615 /* Free the command/command header memory. */
2616 dmam_free_coherent(&dd
->pdev
->dev
,
2617 HW_PORT_PRIV_DMA_SZ
+ (ATA_SECT_SIZE
* 2),
2618 dd
->port
->command_list
,
2619 dd
->port
->command_list_dma
);
2620 /* Free the memory allocated for the for structure. */
2627 * Issue a Standby Immediate command to the device.
2629 * This function is called by the Block Layer just before the
2630 * system powers off during a shutdown.
2632 * @dd Pointer to the driver data structure.
2637 int mtip_hw_shutdown(struct driver_data
*dd
)
2640 * Send standby immediate (E0h) to the drive so that it
2643 mtip_standby_immediate(dd
->port
);
2651 * This function is called by the Block Layer just before the
2652 * system hibernates.
2654 * @dd Pointer to the driver data structure.
2657 * 0 Suspend was successful
2658 * -EFAULT Suspend was not successful
2660 int mtip_hw_suspend(struct driver_data
*dd
)
2663 * Send standby immediate (E0h) to the drive
2664 * so that it saves its state.
2666 if (mtip_standby_immediate(dd
->port
) != 0) {
2667 dev_err(&dd
->pdev
->dev
,
2668 "Failed standby-immediate command\n");
2672 /* Disable interrupts on the HBA.*/
2673 writel(readl(dd
->mmio
+ HOST_CTL
) & ~HOST_IRQ_EN
,
2674 dd
->mmio
+ HOST_CTL
);
2675 mtip_deinit_port(dd
->port
);
2683 * This function is called by the Block Layer as the
2686 * @dd Pointer to the driver data structure.
2689 * 0 Resume was successful
2690 * -EFAULT Resume was not successful
2692 int mtip_hw_resume(struct driver_data
*dd
)
2694 /* Perform any needed hardware setup steps */
2698 if (mtip_hba_reset(dd
) != 0) {
2699 dev_err(&dd
->pdev
->dev
,
2700 "Unable to reset the HBA\n");
2705 * Enable the port, DMA engine, and FIS reception specific
2706 * h/w in controller.
2708 mtip_init_port(dd
->port
);
2709 mtip_start_port(dd
->port
);
2711 /* Enable interrupts on the HBA.*/
2712 writel(readl(dd
->mmio
+ HOST_CTL
) | HOST_IRQ_EN
,
2713 dd
->mmio
+ HOST_CTL
);
2719 * This function is called for clean the pending command in the
2720 * command slot during the surprise removal of device and return
2721 * error to the upper layer.
2723 * @dd Pointer to the DRIVER_DATA structure.
2728 void mtip_command_cleanup(struct driver_data
*dd
)
2730 int group
= 0, commandslot
= 0, commandindex
= 0;
2731 struct mtip_cmd
*command
;
2732 struct mtip_port
*port
= dd
->port
;
2734 for (group
= 0; group
< 4; group
++) {
2735 for (commandslot
= 0; commandslot
< 32; commandslot
++) {
2736 if (!(port
->allocated
[group
] & (1 << commandslot
)))
2739 commandindex
= group
<< 5 | commandslot
;
2740 command
= &port
->commands
[commandindex
];
2742 if (atomic_read(&command
->active
)
2743 && (command
->async_callback
)) {
2744 command
->async_callback(command
->async_data
,
2746 command
->async_callback
= NULL
;
2747 command
->async_data
= NULL
;
2750 dma_unmap_sg(&port
->dd
->pdev
->dev
,
2752 command
->scatter_ents
,
2753 command
->direction
);
2757 up(&port
->cmd_slot
);
2759 atomic_set(&dd
->drv_cleanup_done
, true);
2763 * Helper function for reusing disk name
2764 * upon hot insertion.
2766 static int rssd_disk_name_format(char *prefix
,
2771 const int base
= 'z' - 'a' + 1;
2772 char *begin
= buf
+ strlen(prefix
);
2773 char *end
= buf
+ buflen
;
2783 *--p
= 'a' + (index
% unit
);
2784 index
= (index
/ unit
) - 1;
2785 } while (index
>= 0);
2787 memmove(begin
, p
, end
- p
);
2788 memcpy(buf
, prefix
, strlen(prefix
));
2794 * Block layer IOCTL handler.
2796 * @dev Pointer to the block_device structure.
2798 * @cmd IOCTL command passed from the user application.
2799 * @arg Argument passed from the user application.
2802 * 0 IOCTL completed successfully.
2803 * -ENOTTY IOCTL not supported or invalid driver data
2804 * structure pointer.
2806 static int mtip_block_ioctl(struct block_device
*dev
,
2811 struct driver_data
*dd
= dev
->bd_disk
->private_data
;
2813 if (!capable(CAP_SYS_ADMIN
))
2823 return mtip_hw_ioctl(dd
, cmd
, arg
);
2827 #ifdef CONFIG_COMPAT
2829 * Block layer compat IOCTL handler.
2831 * @dev Pointer to the block_device structure.
2833 * @cmd IOCTL command passed from the user application.
2834 * @arg Argument passed from the user application.
2837 * 0 IOCTL completed successfully.
2838 * -ENOTTY IOCTL not supported or invalid driver data
2839 * structure pointer.
2841 static int mtip_block_compat_ioctl(struct block_device
*dev
,
2846 struct driver_data
*dd
= dev
->bd_disk
->private_data
;
2848 if (!capable(CAP_SYS_ADMIN
))
2857 case HDIO_DRIVE_TASKFILE
: {
2858 struct mtip_compat_ide_task_request_s
*compat_req_task
;
2859 ide_task_request_t req_task
;
2860 int compat_tasksize
, outtotal
, ret
;
2862 compat_tasksize
= sizeof(struct mtip_compat_ide_task_request_s
);
2865 (struct mtip_compat_ide_task_request_s __user
*) arg
;
2867 if (copy_from_user(&req_task
, (void __user
*) arg
,
2868 compat_tasksize
- (2 * sizeof(compat_long_t
))))
2871 if (get_user(req_task
.out_size
, &compat_req_task
->out_size
))
2874 if (get_user(req_task
.in_size
, &compat_req_task
->in_size
))
2877 outtotal
= sizeof(struct mtip_compat_ide_task_request_s
);
2879 ret
= exec_drive_taskfile(dd
, (void __user
*) arg
,
2880 &req_task
, outtotal
);
2882 if (copy_to_user((void __user
*) arg
, &req_task
,
2884 (2 * sizeof(compat_long_t
))))
2887 if (put_user(req_task
.out_size
, &compat_req_task
->out_size
))
2890 if (put_user(req_task
.in_size
, &compat_req_task
->in_size
))
2896 return mtip_hw_ioctl(dd
, cmd
, arg
);
2902 * Obtain the geometry of the device.
2904 * You may think that this function is obsolete, but some applications,
2905 * fdisk for example still used CHS values. This function describes the
2906 * device as having 224 heads and 56 sectors per cylinder. These values are
2907 * chosen so that each cylinder is aligned on a 4KB boundary. Since a
2908 * partition is described in terms of a start and end cylinder this means
2909 * that each partition is also 4KB aligned. Non-aligned partitions adversely
2910 * affects performance.
2912 * @dev Pointer to the block_device strucutre.
2913 * @geo Pointer to a hd_geometry structure.
2916 * 0 Operation completed successfully.
2917 * -ENOTTY An error occurred while reading the drive capacity.
2919 static int mtip_block_getgeo(struct block_device
*dev
,
2920 struct hd_geometry
*geo
)
2922 struct driver_data
*dd
= dev
->bd_disk
->private_data
;
2928 if (!(mtip_hw_get_capacity(dd
, &capacity
))) {
2929 dev_warn(&dd
->pdev
->dev
,
2930 "Could not get drive capacity.\n");
2936 #if BITS_PER_LONG == 64
2937 geo
->cylinders
= capacity
/ (geo
->heads
* geo
->sectors
);
2939 do_div(capacity
, (geo
->heads
* geo
->sectors
));
2940 geo
->cylinders
= capacity
;
2946 * Block device operation function.
2948 * This structure contains pointers to the functions required by the block
2951 static const struct block_device_operations mtip_block_ops
= {
2952 .ioctl
= mtip_block_ioctl
,
2953 #ifdef CONFIG_COMPAT
2954 .compat_ioctl
= mtip_block_compat_ioctl
,
2956 .getgeo
= mtip_block_getgeo
,
2957 .owner
= THIS_MODULE
2961 * Block layer make request function.
2963 * This function is called by the kernel to process a BIO for
2966 * @queue Pointer to the request queue. Unused other than to obtain
2967 * the driver data structure.
2968 * @bio Pointer to the BIO.
2973 static int mtip_make_request(struct request_queue
*queue
, struct bio
*bio
)
2975 struct driver_data
*dd
= queue
->queuedata
;
2976 struct scatterlist
*sg
;
2977 struct bio_vec
*bvec
;
2981 if (unlikely(!bio_has_data(bio
))) {
2982 blk_queue_flush(queue
, 0);
2987 if (unlikely(atomic_read(&dd
->eh_active
))) {
2988 bio_endio(bio
, -EBUSY
);
2992 sg
= mtip_hw_get_scatterlist(dd
, &tag
);
2993 if (likely(sg
!= NULL
)) {
2994 blk_queue_bounce(queue
, &bio
);
2996 if (unlikely((bio
)->bi_vcnt
> MTIP_MAX_SG
)) {
2997 dev_warn(&dd
->pdev
->dev
,
2998 "Maximum number of SGL entries exceeded");
3000 mtip_hw_release_scatterlist(dd
, tag
);
3004 /* Create the scatter list for this bio. */
3005 bio_for_each_segment(bvec
, bio
, nents
) {
3006 sg_set_page(&sg
[nents
],
3012 /* Issue the read/write. */
3013 mtip_hw_submit_io(dd
,
3020 bio
->bi_rw
& REQ_FLUSH
,
3030 * Block layer initialization function.
3032 * This function is called once by the PCI layer for each P320
3033 * device that is connected to the system.
3035 * @dd Pointer to the driver data structure.
3038 * 0 on success else an error code.
3040 int mtip_block_initialize(struct driver_data
*dd
)
3044 unsigned int index
= 0;
3045 struct kobject
*kobj
;
3047 /* Initialize the protocol layer. */
3048 rv
= mtip_hw_init(dd
);
3050 dev_err(&dd
->pdev
->dev
,
3051 "Protocol layer initialization failed\n");
3053 goto protocol_init_error
;
3056 /* Allocate the request queue. */
3057 dd
->queue
= blk_alloc_queue(GFP_KERNEL
);
3058 if (dd
->queue
== NULL
) {
3059 dev_err(&dd
->pdev
->dev
,
3060 "Unable to allocate request queue\n");
3062 goto block_queue_alloc_init_error
;
3065 /* Attach our request function to the request queue. */
3066 blk_queue_make_request(dd
->queue
, mtip_make_request
);
3068 /* Set device limits. */
3069 set_bit(QUEUE_FLAG_NONROT
, &dd
->queue
->queue_flags
);
3070 blk_queue_max_segments(dd
->queue
, MTIP_MAX_SG
);
3071 blk_queue_physical_block_size(dd
->queue
, 4096);
3072 blk_queue_io_min(dd
->queue
, 4096);
3074 dd
->disk
= alloc_disk(MTIP_MAX_MINORS
);
3075 if (dd
->disk
== NULL
) {
3076 dev_err(&dd
->pdev
->dev
,
3077 "Unable to allocate gendisk structure\n");
3079 goto alloc_disk_error
;
3082 /* Generate the disk name, implemented same as in sd.c */
3084 if (!ida_pre_get(&rssd_index_ida
, GFP_KERNEL
))
3087 spin_lock(&rssd_index_lock
);
3088 rv
= ida_get_new(&rssd_index_ida
, &index
);
3089 spin_unlock(&rssd_index_lock
);
3090 } while (rv
== -EAGAIN
);
3095 rv
= rssd_disk_name_format("rssd",
3097 dd
->disk
->disk_name
,
3100 goto disk_index_error
;
3102 dd
->disk
->driverfs_dev
= &dd
->pdev
->dev
;
3103 dd
->disk
->major
= dd
->major
;
3104 dd
->disk
->first_minor
= dd
->instance
* MTIP_MAX_MINORS
;
3105 dd
->disk
->fops
= &mtip_block_ops
;
3106 dd
->disk
->queue
= dd
->queue
;
3107 dd
->disk
->private_data
= dd
;
3108 dd
->queue
->queuedata
= dd
;
3111 /* Set the capacity of the device in 512 byte sectors. */
3112 if (!(mtip_hw_get_capacity(dd
, &capacity
))) {
3113 dev_warn(&dd
->pdev
->dev
,
3114 "Could not read drive capacity\n");
3116 goto read_capacity_error
;
3118 set_capacity(dd
->disk
, capacity
);
3120 /* Enable the block device and add it to /dev */
3124 * Now that the disk is active, initialize any sysfs attributes
3125 * managed by the protocol layer.
3127 kobj
= kobject_get(&disk_to_dev(dd
->disk
)->kobj
);
3129 mtip_hw_sysfs_init(dd
, kobj
);
3135 read_capacity_error
:
3137 * Delete our gendisk structure. This also removes the device
3140 del_gendisk(dd
->disk
);
3143 spin_lock(&rssd_index_lock
);
3144 ida_remove(&rssd_index_ida
, index
);
3145 spin_unlock(&rssd_index_lock
);
3151 blk_cleanup_queue(dd
->queue
);
3153 block_queue_alloc_init_error
:
3154 /* De-initialize the protocol layer. */
3157 protocol_init_error
:
3162 * Block layer deinitialization function.
3164 * Called by the PCI layer as each P320 device is removed.
3166 * @dd Pointer to the driver data structure.
3171 int mtip_block_remove(struct driver_data
*dd
)
3173 struct kobject
*kobj
;
3174 /* Clean up the sysfs attributes managed by the protocol layer. */
3175 kobj
= kobject_get(&disk_to_dev(dd
->disk
)->kobj
);
3177 mtip_hw_sysfs_exit(dd
, kobj
);
3182 * Delete our gendisk structure. This also removes the device
3185 del_gendisk(dd
->disk
);
3186 blk_cleanup_queue(dd
->queue
);
3190 /* De-initialize the protocol layer. */
3197 * Function called by the PCI layer when just before the
3198 * machine shuts down.
3200 * If a protocol layer shutdown function is present it will be called
3203 * @dd Pointer to the driver data structure.
3208 int mtip_block_shutdown(struct driver_data
*dd
)
3210 dev_info(&dd
->pdev
->dev
,
3211 "Shutting down %s ...\n", dd
->disk
->disk_name
);
3213 /* Delete our gendisk structure, and cleanup the blk queue. */
3214 del_gendisk(dd
->disk
);
3215 blk_cleanup_queue(dd
->queue
);
3219 mtip_hw_shutdown(dd
);
3223 int mtip_block_suspend(struct driver_data
*dd
)
3225 dev_info(&dd
->pdev
->dev
,
3226 "Suspending %s ...\n", dd
->disk
->disk_name
);
3227 mtip_hw_suspend(dd
);
3231 int mtip_block_resume(struct driver_data
*dd
)
3233 dev_info(&dd
->pdev
->dev
, "Resuming %s ...\n",
3234 dd
->disk
->disk_name
);
3240 * Called for each supported PCI device detected.
3242 * This function allocates the private data structure, enables the
3243 * PCI device and then calls the block layer initialization function.
3246 * 0 on success else an error code.
3248 static int mtip_pci_probe(struct pci_dev
*pdev
,
3249 const struct pci_device_id
*ent
)
3252 struct driver_data
*dd
= NULL
;
3254 /* Allocate memory for this devices private data. */
3255 dd
= kzalloc(sizeof(struct driver_data
), GFP_KERNEL
);
3258 "Unable to allocate memory for driver data\n");
3262 /* Set the atomic variable as 1 in case of SRSI */
3263 atomic_set(&dd
->drv_cleanup_done
, true);
3265 atomic_set(&dd
->resumeflag
, false);
3266 atomic_set(&dd
->eh_active
, 0);
3268 /* Attach the private data to this PCI device. */
3269 pci_set_drvdata(pdev
, dd
);
3271 rv
= pcim_enable_device(pdev
);
3273 dev_err(&pdev
->dev
, "Unable to enable device\n");
3277 /* Map BAR5 to memory. */
3278 rv
= pcim_iomap_regions(pdev
, 1 << MTIP_ABAR
, MTIP_DRV_NAME
);
3280 dev_err(&pdev
->dev
, "Unable to map regions\n");
3284 if (!pci_set_dma_mask(pdev
, DMA_BIT_MASK(64))) {
3285 rv
= pci_set_consistent_dma_mask(pdev
, DMA_BIT_MASK(64));
3288 rv
= pci_set_consistent_dma_mask(pdev
,
3291 dev_warn(&pdev
->dev
,
3292 "64-bit DMA enable failed\n");
3298 pci_set_master(pdev
);
3300 if (pci_enable_msi(pdev
)) {
3301 dev_warn(&pdev
->dev
,
3302 "Unable to enable MSI interrupt.\n");
3303 goto block_initialize_err
;
3306 /* Copy the info we may need later into the private data structure. */
3307 dd
->major
= mtip_major
;
3308 dd
->protocol
= ent
->driver_data
;
3309 dd
->instance
= instance
;
3312 /* Initialize the block layer. */
3313 rv
= mtip_block_initialize(dd
);
3316 "Unable to initialize block layer\n");
3317 goto block_initialize_err
;
3321 * Increment the instance count so that each device has a unique
3328 block_initialize_err
:
3329 pci_disable_msi(pdev
);
3332 pcim_iounmap_regions(pdev
, 1 << MTIP_ABAR
);
3336 pci_set_drvdata(pdev
, NULL
);
3339 /* Set the atomic variable as 0 in case of SRSI */
3340 atomic_set(&dd
->drv_cleanup_done
, true);
3346 * Called for each probed device when the device is removed or the
3347 * driver is unloaded.
3352 static void mtip_pci_remove(struct pci_dev
*pdev
)
3354 struct driver_data
*dd
= pci_get_drvdata(pdev
);
3357 if (mtip_check_surprise_removal(pdev
)) {
3358 while (atomic_read(&dd
->drv_cleanup_done
) == false) {
3361 if (counter
== 10) {
3362 /* Cleanup the outstanding commands */
3363 mtip_command_cleanup(dd
);
3368 /* Set the atomic variable as 1 in case of SRSI */
3369 atomic_set(&dd
->drv_cleanup_done
, true);
3371 /* Clean up the block layer. */
3372 mtip_block_remove(dd
);
3374 pci_disable_msi(pdev
);
3377 pcim_iounmap_regions(pdev
, 1 << MTIP_ABAR
);
3381 * Called for each probed device when the device is suspended.
3387 static int mtip_pci_suspend(struct pci_dev
*pdev
, pm_message_t mesg
)
3390 struct driver_data
*dd
= pci_get_drvdata(pdev
);
3394 "Driver private datastructure is NULL\n");
3398 atomic_set(&dd
->resumeflag
, true);
3400 /* Disable ports & interrupts then send standby immediate */
3401 rv
= mtip_block_suspend(dd
);
3404 "Failed to suspend controller\n");
3409 * Save the pci config space to pdev structure &
3410 * disable the device
3412 pci_save_state(pdev
);
3413 pci_disable_device(pdev
);
3415 /* Move to Low power state*/
3416 pci_set_power_state(pdev
, PCI_D3hot
);
3422 * Called for each probed device when the device is resumed.
3428 static int mtip_pci_resume(struct pci_dev
*pdev
)
3431 struct driver_data
*dd
;
3433 dd
= pci_get_drvdata(pdev
);
3436 "Driver private datastructure is NULL\n");
3440 /* Move the device to active State */
3441 pci_set_power_state(pdev
, PCI_D0
);
3443 /* Restore PCI configuration space */
3444 pci_restore_state(pdev
);
3446 /* Enable the PCI device*/
3447 rv
= pcim_enable_device(pdev
);
3450 "Failed to enable card during resume\n");
3453 pci_set_master(pdev
);
3456 * Calls hbaReset, initPort, & startPort function
3457 * then enables interrupts
3459 rv
= mtip_block_resume(dd
);
3461 dev_err(&pdev
->dev
, "Unable to resume\n");
3464 atomic_set(&dd
->resumeflag
, false);
3475 static void mtip_pci_shutdown(struct pci_dev
*pdev
)
3477 struct driver_data
*dd
= pci_get_drvdata(pdev
);
3479 mtip_block_shutdown(dd
);
3483 * This function check_for_surprise_removal is called
3484 * while card is removed from the system and it will
3485 * read the vendor id from the configration space
3487 * @pdev Pointer to the pci_dev structure.
3490 * true if device removed, else false
3492 bool mtip_check_surprise_removal(struct pci_dev
*pdev
)
3496 /* Read the vendorID from the configuration space */
3497 pci_read_config_word(pdev
, 0x00, &vendor_id
);
3498 if (vendor_id
== 0xFFFF)
3499 return true; /* device removed */
3501 return false; /* device present */
3504 /* Table of device ids supported by this driver. */
3505 static DEFINE_PCI_DEVICE_TABLE(mtip_pci_tbl
) = {
3506 { PCI_DEVICE(PCI_VENDOR_ID_MICRON
, P320_DEVICE_ID
) },
3510 /* Structure that describes the PCI driver functions. */
3511 struct pci_driver mtip_pci_driver
= {
3512 .name
= MTIP_DRV_NAME
,
3513 .id_table
= mtip_pci_tbl
,
3514 .probe
= mtip_pci_probe
,
3515 .remove
= mtip_pci_remove
,
3516 .suspend
= mtip_pci_suspend
,
3517 .resume
= mtip_pci_resume
,
3518 .shutdown
= mtip_pci_shutdown
,
3521 MODULE_DEVICE_TABLE(pci
, mtip_pci_tbl
);
3524 * Module initialization function.
3526 * Called once when the module is loaded. This function allocates a major
3527 * block device number to the Cyclone devices and registers the PCI layer
3531 * 0 on success else error code.
3533 static int __init
mtip_init(void)
3535 printk(KERN_INFO MTIP_DRV_NAME
" Version " MTIP_DRV_VERSION
"\n");
3537 /* Allocate a major block device number to use with this driver. */
3538 mtip_major
= register_blkdev(0, MTIP_DRV_NAME
);
3539 if (mtip_major
< 0) {
3540 printk(KERN_ERR
"Unable to register block device (%d)\n",
3545 /* Register our PCI operations. */
3546 return pci_register_driver(&mtip_pci_driver
);
3550 * Module de-initialization function.
3552 * Called once when the module is unloaded. This function deallocates
3553 * the major block device number allocated by mtip_init() and
3554 * unregisters the PCI layer of the driver.
3559 static void __exit
mtip_exit(void)
3561 /* Release the allocated major block device number. */
3562 unregister_blkdev(mtip_major
, MTIP_DRV_NAME
);
3564 /* Unregister the PCI driver. */
3565 pci_unregister_driver(&mtip_pci_driver
);
3568 MODULE_AUTHOR("Micron Technology, Inc");
3569 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
3570 MODULE_LICENSE("GPL");
3571 MODULE_VERSION(MTIP_DRV_VERSION
);
3573 module_init(mtip_init
);
3574 module_exit(mtip_exit
);