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libpayload/ahci: Fix a warning by decompartmentalise the AHCI driver. 

Decompartmentalise AHCI driver into two parts, ATA and ATAPI. Add a few
superficial comments while here. This also fixes a compiler warning.

Change-Id: Ia1fd545b39868a81cbc311f6ffc786f9f1f61415
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/4783
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Edward O'Callaghan 2014-01-23 08:30:42 +11:00 committed by Patrick Georgi
parent 09af15e09e
commit efc5841ab4
6 changed files with 462 additions and 275 deletions
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12
payloads/libpayload/drivers/Makefile.inc
View File

@ -54,10 +54,18 @@ libc-$(CONFIG_GEODELX_VIDEO_CONSOLE) += video/font8x16.c
libc-$(CONFIG_COREBOOT_VIDEO_CONSOLE) += video/corebootfb.c
libc-$(CONFIG_COREBOOT_VIDEO_CONSOLE) += video/font8x16.c
# AHCI/ATAPI driver
libc-$(CONFIG_STORAGE) += storage/storage.c
libc-$(CONFIG_STORAGE_ATA) += storage/ata.c
libc-$(CONFIG_STORAGE_ATAPI) += storage/atapi.c
libc-$(CONFIG_STORAGE_AHCI) += storage/ahci.c
libc-$(CONFIG_STORAGE_AHCI) += storage/ahci_common.c
ifeq ($(CONFIG_STORAGE_ATA),y)
libc-$(CONFIG_STORAGE_ATA) += storage/ata.c
libc-$(CONFIG_STORAGE_ATA) += storage/ahci_ata.c
endif
ifeq ($(CONFIG_STORAGE_ATAPI),y)
libc-$(CONFIG_STORAGE_ATAPI) += storage/atapi.c
libc-$(CONFIG_STORAGE_ATAPI) += storage/ahci_atapi.c
endif
# USB stack
libc-$(CONFIG_USB) += usb/usbinit.c

273
payloads/libpayload/drivers/storage/ahci.c
View File

@ -71,54 +71,8 @@ static inline int ahci_port_is_active(const hba_port_t *const port)
== (HBA_PxSSTS_IPM_ACTIVE | HBA_PxSSTS_DET_ESTABLISHED);
}
static int ahci_cmdengine_start(hba_port_t *const port)
{
/* CR has to be clear before starting the command engine.
This shouldn't take too long, but we should time out nevertheless. */
int timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_CR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during start of command engine.\n");
return 1;
}
port->cmd_stat |= HBA_PxCMD_FRE;
port->cmd_stat |= HBA_PxCMD_ST;
return 0;
}
static int ahci_cmdengine_stop(hba_port_t *const port)
{
port->cmd_stat &= ~HBA_PxCMD_ST;
/* Wait for the controller to clear CR.
This shouldn't take too long, but we should time out nevertheless. */
int timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_CR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during stopping of command engine.\n");
return 1;
}
port->cmd_stat &= ~HBA_PxCMD_FRE;
/* Wait for the controller to clear FR.
This shouldn't take too long, but we should time out nevertheless. */
timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_FR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during stopping of command engine.\n");
return 1;
}
return 0;
}
/** Do minimal error recovery. */
static int ahci_error_recovery(ahci_dev_t *const dev, const u32 intr_status)
int ahci_error_recovery(ahci_dev_t *const dev, const u32 intr_status)
{
/* Command engine has to be restarted.
We don't call ahci_cmdengine_stop() here as it also checks
@ -145,231 +99,6 @@ static int ahci_error_recovery(ahci_dev_t *const dev, const u32 intr_status)
return -1;
}
/** Give a buffer with even address. */
static u8 *ahci_prdbuf_init(ahci_dev_t *const dev,
u8 *const user_buf, const size_t len,
const int out)
{
if ((u32)user_buf & 1) {
printf("ahci: Odd buffer pointer (%p).\n", user_buf);
if (dev->buf) /* orphaned buffer */
free((void *)dev->buf - *(dev->buf - 1));
dev->buf = malloc(len + 2);
if (!dev->buf)
return NULL;
dev->user_buf = user_buf;
dev->write_back = !out;
dev->buflen = len;
if ((u32)dev->buf & 1) {
dev->buf[0] = 1;
dev->buf += 1;
} else {
dev->buf[0] = 1;
dev->buf[1] = 2;
dev->buf += 2;
}
if (out)
memcpy(dev->buf, user_buf, len);
return dev->buf;
} else {
return user_buf;
}
}
static void ahci_prdbuf_finalize(ahci_dev_t *const dev)
{
if (dev->buf) {
if (dev->write_back)
memcpy(dev->user_buf, dev->buf, dev->buflen);
free((void *)dev->buf - *(dev->buf - 1));
}
dev->buf = NULL;
dev->user_buf = NULL;
dev->write_back = 0;
dev->buflen = 0;
}
static ssize_t ahci_cmdslot_exec(ahci_dev_t *const dev)
{
const int slotnum = 0; /* We always use the first slot. */
if (!(dev->port->cmd_stat & HBA_PxCMD_CR))
return -1;
/* Trigger command execution. */
dev->port->cmd_issue |= (1 << slotnum);
/* Wait for the controller to finish command execution. */
int timeout = 50000; /* Time out after 50000 * 100us == 5s. */
while ((dev->port->cmd_issue & (1 << slotnum)) &&
!(dev->port->intr_status & HBA_PxIS_TFES) &&
timeout--)
udelay(100);
if (timeout < 0) {
printf("ahci: Timeout during command execution.\n");
return -1;
}
ahci_prdbuf_finalize(dev);
const u32 intr_status = ahci_clear_status(dev->port, intr_status);
if (intr_status & (HBA_PxIS_FATAL | HBA_PxIS_PCS)) {
ahci_error_recovery(dev, intr_status);
return -1;
} else {
return dev->cmdlist[slotnum].prd_bytes;
}
}
static size_t ahci_cmdslot_prepare(ahci_dev_t *const dev,
u8 *const user_buf, size_t buf_len,
const int out)
{
const int slotnum = 0; /* We always use the first slot. */
size_t read_count = 0;
memset((void *)&dev->cmdlist[slotnum],
'\0', sizeof(dev->cmdlist[slotnum]));
memset((void *)dev->cmdtable,
'\0', sizeof(*dev->cmdtable));
dev->cmdlist[slotnum].cmd = CMD_CFL(FIS_H2D_FIS_LEN);
dev->cmdlist[slotnum].cmdtable_base = virt_to_phys(dev->cmdtable);
if (buf_len > 0) {
size_t prdt_len;
u8 *buf;
int i;
prdt_len = ((buf_len - 1) >> BYTES_PER_PRD_SHIFT) + 1;
const size_t max_prdt_len = ARRAY_SIZE(dev->cmdtable->prdt);
if (prdt_len > max_prdt_len) {
prdt_len = max_prdt_len;
buf_len = prdt_len << BYTES_PER_PRD_SHIFT;
}
dev->cmdlist[slotnum].prdt_length = prdt_len;
read_count = buf_len;
buf = ahci_prdbuf_init(dev, user_buf, buf_len, out);
if (!buf)
return 0;
for (i = 0; i < prdt_len; ++i) {
const size_t bytes =
(buf_len < BYTES_PER_PRD)
? buf_len : BYTES_PER_PRD;
dev->cmdtable->prdt[i].data_base = virt_to_phys(buf);
dev->cmdtable->prdt[i].flags = PRD_TABLE_BYTES(bytes);
buf_len -= bytes;
buf += bytes;
}
}
return read_count;
}
static ssize_t ahci_ata_read_sectors(ata_dev_t *const ata_dev,
const lba_t start, size_t count,
u8 *const buf)
{
ahci_dev_t *const dev = (ahci_dev_t *)ata_dev;
if (count == 0)
return 0;
if (ata_dev->read_cmd == ATA_READ_DMA) {
if (start >= (1 << 28)) {
printf("ahci: Sector is not 28-bit addressable.\n");
return -1;
} else if (count > 256) {
printf("ahci: Sector count too high (max. 256).\n");
count = 256;
}
#ifdef CONFIG_STORAGE_64BIT_LBA
} else if (ata_dev->read_cmd == ATA_READ_DMA_EXT) {
if (start >= (1ULL << 48)) {
printf("ahci: Sector is not 48-bit addressable.\n");
return -1;
} else if (count > (64 * 1024)) {
printf("ahci: Sector count too high (max. 65536).\n");
count = 64 * 1024;
}
#endif
} else {
printf("ahci: Unsupported ATA read command (0x%x).\n",
ata_dev->read_cmd);
return -1;
}
const size_t bytes = count << ata_dev->sector_size_shift;
const size_t bytes_feasible = ahci_cmdslot_prepare(dev, buf, bytes, 0);
const size_t sectors = bytes_feasible >> ata_dev->sector_size_shift;
dev->cmdtable->fis[ 0] = FIS_HOST_TO_DEVICE;
dev->cmdtable->fis[ 1] = FIS_H2D_CMD;
dev->cmdtable->fis[ 2] = ata_dev->read_cmd;
dev->cmdtable->fis[ 4] = (start >> 0) & 0xff;
dev->cmdtable->fis[ 5] = (start >> 8) & 0xff;
dev->cmdtable->fis[ 6] = (start >> 16) & 0xff;
dev->cmdtable->fis[ 7] = FIS_H2D_DEV_LBA;
dev->cmdtable->fis[ 8] = (start >> 24) & 0xff;
#ifdef CONFIG_STORAGE_64BIT_LBA
if (ata_dev->read_cmd == ATA_READ_DMA_EXT) {
dev->cmdtable->fis[ 9] = (start >> 32) & 0xff;
dev->cmdtable->fis[10] = (start >> 40) & 0xff;
}
#endif
dev->cmdtable->fis[12] = (sectors >> 0) & 0xff;
dev->cmdtable->fis[13] = (sectors >> 8) & 0xff;
if (ahci_cmdslot_exec(dev) < 0)
return -1;
else
return dev->cmdlist->prd_bytes >> ata_dev->sector_size_shift;
}
static ssize_t ahci_packet_read_cmd(atapi_dev_t *const _dev,
const u8 *const cmd, const size_t cmdlen,
u8 *const buf, const size_t buflen)
{
ahci_dev_t *const dev = (ahci_dev_t *)_dev;
if ((cmdlen != 12) && (cmdlen != 16)) {
printf("ahci: Only 12- and 16-byte packet commands allowed.\n");
return -1;
}
const size_t len = ahci_cmdslot_prepare(dev, buf, buflen, 0);
u16 byte_limit = MIN(len, 63 * 1024); /* like Linux */
if (byte_limit & 1) ++byte_limit; /* even limit */
dev->cmdlist[0].cmd |= CMD_ATAPI;
dev->cmdtable->fis[0] = FIS_HOST_TO_DEVICE;
dev->cmdtable->fis[1] = FIS_H2D_CMD;
dev->cmdtable->fis[2] = ATA_PACKET;
dev->cmdtable->fis[5] = byte_limit & 0xff;
dev->cmdtable->fis[6] = byte_limit >> 8;
memcpy((void *)dev->cmdtable->atapi_cmd, cmd, cmdlen);
return ahci_cmdslot_exec(dev);
}
static int ahci_identify_device(ata_dev_t *const ata_dev, u8 *const buf)
{
ahci_dev_t *const dev = (ahci_dev_t *)ata_dev;
ahci_cmdslot_prepare(dev, buf, 512, 0);
dev->cmdtable->fis[0] = FIS_HOST_TO_DEVICE;
dev->cmdtable->fis[1] = FIS_H2D_CMD;
dev->cmdtable->fis[2] = ata_dev->identify_cmd;
if ((ahci_cmdslot_exec(dev) < 0) || (dev->cmdlist->prd_bytes != 512))
return -1;
else
return 0;
}
static int ahci_dev_init(hba_ctrl_t *const ctrl,
hba_port_t *const port,
const int portnum)

100
payloads/libpayload/drivers/storage/ahci_ata.c Normal file
View File

@ -0,0 +1,100 @@
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2012 secunet Security Networks AG
* Copyright (C) 2013 Edward O'Callaghan <eocallaghan@alterapraxis.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <libpayload.h>
#include <pci.h>
#include <storage/ata.h>
#include <storage/ahci.h>
#include "ahci_private.h"
ssize_t ahci_ata_read_sectors(ata_dev_t *const ata_dev,
const lba_t start, size_t count,
u8 *const buf)
{
ahci_dev_t *const dev = (ahci_dev_t *)ata_dev;
if (count == 0)
return 0;
if (ata_dev->read_cmd == ATA_READ_DMA) {
if (start >= (1 << 28)) {
printf("ahci: Sector is not 28-bit addressable.\n");
return -1;
} else if (count > 256) {
printf("ahci: Sector count too high (max. 256).\n");
count = 256;
}
#ifdef CONFIG_STORAGE_64BIT_LBA
} else if (ata_dev->read_cmd == ATA_READ_DMA_EXT) {
if (start >= (1ULL << 48)) {
printf("ahci: Sector is not 48-bit addressable.\n");
return -1;
} else if (count > (64 * 1024)) {
printf("ahci: Sector count too high (max. 65536).\n");
count = 64 * 1024;
}
#endif
} else {
printf("ahci: Unsupported ATA read command (0x%x).\n",
ata_dev->read_cmd);
return -1;
}
const size_t bytes = count << ata_dev->sector_size_shift;
const size_t bytes_feasible = ahci_cmdslot_prepare(dev, buf, bytes, 0);
const size_t sectors = bytes_feasible >> ata_dev->sector_size_shift;
dev->cmdtable->fis[ 0] = FIS_HOST_TO_DEVICE;
dev->cmdtable->fis[ 1] = FIS_H2D_CMD;
dev->cmdtable->fis[ 2] = ata_dev->read_cmd;
dev->cmdtable->fis[ 4] = (start >> 0) & 0xff;
dev->cmdtable->fis[ 5] = (start >> 8) & 0xff;
dev->cmdtable->fis[ 6] = (start >> 16) & 0xff;
dev->cmdtable->fis[ 7] = FIS_H2D_DEV_LBA;
dev->cmdtable->fis[ 8] = (start >> 24) & 0xff;
#ifdef CONFIG_STORAGE_64BIT_LBA
if (ata_dev->read_cmd == ATA_READ_DMA_EXT) {
dev->cmdtable->fis[ 9] = (start >> 32) & 0xff;
dev->cmdtable->fis[10] = (start >> 40) & 0xff;
}
#endif
dev->cmdtable->fis[12] = (sectors >> 0) & 0xff;
dev->cmdtable->fis[13] = (sectors >> 8) & 0xff;
if (ahci_cmdslot_exec(dev) < 0)
return -1;
else
return dev->cmdlist->prd_bytes >> ata_dev->sector_size_shift;
}

67
payloads/libpayload/drivers/storage/ahci_atapi.c Normal file
View File

@ -0,0 +1,67 @@
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2012 secunet Security Networks AG
* Copyright (C) 2013 Edward O'Callaghan <eocallaghan@alterapraxis.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <libpayload.h>
#include <pci.h>
#include <storage/ata.h>
#include <storage/ahci.h>
#include "ahci_private.h"
ssize_t ahci_packet_read_cmd(atapi_dev_t *const _dev,
const u8 *const cmd, const size_t cmdlen,
u8 *const buf, const size_t buflen)
{
ahci_dev_t *const dev = (ahci_dev_t *)_dev;
if ((cmdlen != 12) && (cmdlen != 16)) {
printf("ahci: Only 12- and 16-byte packet commands allowed.\n");
return -1;
}
const size_t len = ahci_cmdslot_prepare(dev, buf, buflen, 0);
u16 byte_limit = MIN(len, 63 * 1024); /* like Linux */
if (byte_limit & 1) ++byte_limit; /* even limit */
dev->cmdlist[0].cmd |= CMD_ATAPI;
dev->cmdtable->fis[0] = FIS_HOST_TO_DEVICE;
dev->cmdtable->fis[1] = FIS_H2D_CMD;
dev->cmdtable->fis[2] = ATA_PACKET;
dev->cmdtable->fis[5] = byte_limit & 0xff;
dev->cmdtable->fis[6] = byte_limit >> 8;
memcpy((void *)dev->cmdtable->atapi_cmd, cmd, cmdlen);
return ahci_cmdslot_exec(dev);
}

250
payloads/libpayload/drivers/storage/ahci_common.c Normal file
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@ -0,0 +1,250 @@
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2012 secunet Security Networks AG
* Copyright (C) 2013 Edward O'Callaghan <eocallaghan@alterapraxis.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <libpayload.h>
#include <pci.h>
#include <storage/ata.h>
#include <storage/ahci.h>
#include "ahci_private.h"
#ifdef DEBUG_STATUS
static inline u32 _ahci_clear_status(volatile u32 *const reg,
const char *const r,
const char *const f)
{
const u32 bits = *reg;
if (bits)
*reg = bits;
printf("ahci: %s: %s == 0x%08x\n", f, r, bits);
return bits;
}
#define ahci_clear_status(p, r) _ahci_clear_status(&(p)->r, #r, __func__)
#else
static inline u32 _ahci_clear_status(volatile u32 *const reg)
{
const u32 bits = *reg;
if (bits)
*reg = bits;
return bits;
}
#define ahci_clear_status(p, r) _ahci_clear_status(&(p)->r)
#endif
/** Give a buffer with even address. */
static u8 *ahci_prdbuf_init(ahci_dev_t *const dev,
u8 *const user_buf, const size_t len,
const int out)
{
if ((u32)user_buf & 1) {
printf("ahci: Odd buffer pointer (%p).\n", user_buf);
if (dev->buf) /* orphaned buffer */
free((void *)dev->buf - *(dev->buf - 1));
dev->buf = malloc(len + 2);
if (!dev->buf)
return NULL;
dev->user_buf = user_buf;
dev->write_back = !out;
dev->buflen = len;
if ((u32)dev->buf & 1) {
dev->buf[0] = 1;
dev->buf += 1;
} else {
dev->buf[0] = 1;
dev->buf[1] = 2;
dev->buf += 2;
}
if (out)
memcpy(dev->buf, user_buf, len);
return dev->buf;
} else {
return user_buf;
}
}
static void ahci_prdbuf_finalize(ahci_dev_t *const dev)
{
if (dev->buf) {
if (dev->write_back)
memcpy(dev->user_buf, dev->buf, dev->buflen);
free((void *)dev->buf - *(dev->buf - 1));
}
dev->buf = NULL;
dev->user_buf = NULL;
dev->write_back = 0;
dev->buflen = 0;
}
int ahci_cmdengine_start(hba_port_t *const port)
{
/* CR has to be clear before starting the command engine.
This shouldn't take too long, but we should time out nevertheless. */
int timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_CR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during start of command engine.\n");
return 1;
}
port->cmd_stat |= HBA_PxCMD_FRE;
port->cmd_stat |= HBA_PxCMD_ST;
return 0;
}
int ahci_cmdengine_stop(hba_port_t *const port)
{
port->cmd_stat &= ~HBA_PxCMD_ST;
/* Wait for the controller to clear CR.
This shouldn't take too long, but we should time out nevertheless. */
int timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_CR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during stopping of command engine.\n");
return 1;
}
port->cmd_stat &= ~HBA_PxCMD_FRE;
/* Wait for the controller to clear FR.
This shouldn't take too long, but we should time out nevertheless. */
timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_FR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during stopping of command engine.\n");
return 1;
}
return 0;
}
ssize_t ahci_cmdslot_exec(ahci_dev_t *const dev)
{
const int slotnum = 0; /* We always use the first slot. */
if (!(dev->port->cmd_stat & HBA_PxCMD_CR))
return -1;
/* Trigger command execution. */
dev->port->cmd_issue |= (1 << slotnum);
/* Wait for the controller to finish command execution. */
int timeout = 50000; /* Time out after 50000 * 100us == 5s. */
while ((dev->port->cmd_issue & (1 << slotnum)) &&
!(dev->port->intr_status & HBA_PxIS_TFES) &&
timeout--)
udelay(100);
if (timeout < 0) {
printf("ahci: Timeout during command execution.\n");
return -1;
}
ahci_prdbuf_finalize(dev);
const u32 intr_status = ahci_clear_status(dev->port, intr_status);
if (intr_status & (HBA_PxIS_FATAL | HBA_PxIS_PCS)) {
ahci_error_recovery(dev, intr_status);
return -1;
} else {
return dev->cmdlist[slotnum].prd_bytes;
}
}
size_t ahci_cmdslot_prepare(ahci_dev_t *const dev,
u8 *const user_buf, size_t buf_len,
const int out)
{
const int slotnum = 0; /* We always use the first slot. */
size_t read_count = 0;
memset((void *)&dev->cmdlist[slotnum],
'\0', sizeof(dev->cmdlist[slotnum]));
memset((void *)dev->cmdtable,
'\0', sizeof(*dev->cmdtable));
dev->cmdlist[slotnum].cmd = CMD_CFL(FIS_H2D_FIS_LEN);
dev->cmdlist[slotnum].cmdtable_base = virt_to_phys(dev->cmdtable);
if (buf_len > 0) {
size_t prdt_len;
u8 *buf;
int i;
prdt_len = ((buf_len - 1) >> BYTES_PER_PRD_SHIFT) + 1;
const size_t max_prdt_len = ARRAY_SIZE(dev->cmdtable->prdt);
if (prdt_len > max_prdt_len) {
prdt_len = max_prdt_len;
buf_len = prdt_len << BYTES_PER_PRD_SHIFT;
}
dev->cmdlist[slotnum].prdt_length = prdt_len;
read_count = buf_len;
buf = ahci_prdbuf_init(dev, user_buf, buf_len, out);
if (!buf)
return 0;
for (i = 0; i < prdt_len; ++i) {
const size_t bytes =
(buf_len < BYTES_PER_PRD)
? buf_len : BYTES_PER_PRD;
dev->cmdtable->prdt[i].data_base = virt_to_phys(buf);
dev->cmdtable->prdt[i].flags = PRD_TABLE_BYTES(bytes);
buf_len -= bytes;
buf += bytes;
}
}
return read_count;
}
int ahci_identify_device(ata_dev_t *const ata_dev, u8 *const buf)
{
ahci_dev_t *const dev = (ahci_dev_t *)ata_dev;
ahci_cmdslot_prepare(dev, buf, 512, 0);
dev->cmdtable->fis[0] = FIS_HOST_TO_DEVICE;
dev->cmdtable->fis[1] = FIS_H2D_CMD;
dev->cmdtable->fis[2] = ata_dev->identify_cmd;
if ((ahci_cmdslot_exec(dev) < 0) || (dev->cmdlist->prd_bytes != 512))
return -1;
else
return 0;
}

35
payloads/libpayload/drivers/storage/ahci_private.h
View File

@ -2,6 +2,7 @@
* This file is part of the libpayload project.
*
* Copyright (C) 2012 secunet Security Networks AG
* Copyright (C) 2013 Edward O'Callaghan <eocallaghan@alterapraxis.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -198,4 +199,36 @@ typedef struct {
size_t buflen;
} ahci_dev_t;
#endif
/*
* ahci_common.c
*/
int ahci_cmdengine_start(hba_port_t *const port);
int ahci_cmdengine_stop(hba_port_t *const port);
ssize_t ahci_cmdslot_exec(ahci_dev_t *const dev);
size_t ahci_cmdslot_prepare(ahci_dev_t *const dev,
u8 *const user_buf, size_t buf_len,
const int out);
int ahci_identify_device(ata_dev_t *const ata_dev, u8 *const buf);
int ahci_error_recovery(ahci_dev_t *const dev, const u32 intr_status);
/*
* ahci_atapi.c
*/
ssize_t ahci_packet_read_cmd(atapi_dev_t *const _dev,
const u8 *const cmd, const size_t cmdlen,
u8 *const buf, const size_t buflen);
/*
* ahci_ata.c
*/
ssize_t ahci_ata_read_sectors(ata_dev_t *const ata_dev,
const lba_t start, size_t count,
u8 *const buf);
#endif /* _AHCI_PRIVATE_H */