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linux_dsm_epyc7002/drivers/memstick/host/rtsx_usb_ms.c
Oleksandr Natalenko a831979f85 rtsx_usb_ms: use schedule_timeout_idle() in polling loop 
First version of this patch has already been posted to LKML by Ben
Hutchings ~6 months ago, but no further action were performed.

Ben's original message:

: rtsx_usb_ms creates a task that mostly sleeps, but tasks in
: uninterruptible sleep still contribute to the load average (for
: bug-compatibility with Unix).  A load average of ~1 on a system that
: should be idle is somewhat alarming.
:
: Change the sleep to be interruptible, but still ignore signals.

References: https://bugs.debian.org/765717
Link: http://lkml.kernel.org/r/b49f95ae83057efa5d96f532803cba47@natalenko.name
Signed-off-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: Roger Tseng <rogerable@realtek.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-23 17:04:14 -07:00

839 lines
21 KiB
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/* Realtek USB Memstick Card Interface driver
*
* Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*
* Author:
* Roger Tseng <rogerable@realtek.com>
*/
#include <linux/module.h>
#include <linux/highmem.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/memstick.h>
#include <linux/kthread.h>
#include <linux/mfd/rtsx_usb.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/completion.h>
#include <asm/unaligned.h>
struct rtsx_usb_ms {
struct platform_device *pdev;
struct rtsx_ucr *ucr;
struct memstick_host *msh;
struct memstick_request *req;
struct mutex host_mutex;
struct work_struct handle_req;
struct task_struct *detect_ms;
struct completion detect_ms_exit;
u8 ssc_depth;
unsigned int clock;
int power_mode;
unsigned char ifmode;
bool eject;
};
static inline struct device *ms_dev(struct rtsx_usb_ms *host)
{
return &(host->pdev->dev);
}
static inline void ms_clear_error(struct rtsx_usb_ms *host)
{
struct rtsx_ucr *ucr = host->ucr;
rtsx_usb_ep0_write_register(ucr, CARD_STOP,
MS_STOP | MS_CLR_ERR,
MS_STOP | MS_CLR_ERR);
rtsx_usb_clear_dma_err(ucr);
rtsx_usb_clear_fsm_err(ucr);
}
#ifdef DEBUG
static void ms_print_debug_regs(struct rtsx_usb_ms *host)
{
struct rtsx_ucr *ucr = host->ucr;
u16 i;
u8 *ptr;
/* Print MS host internal registers */
rtsx_usb_init_cmd(ucr);
/* MS_CFG to MS_INT_REG */
for (i = 0xFD40; i <= 0xFD44; i++)
rtsx_usb_add_cmd(ucr, READ_REG_CMD, i, 0, 0);
/* CARD_SHARE_MODE to CARD_GPIO */
for (i = 0xFD51; i <= 0xFD56; i++)
rtsx_usb_add_cmd(ucr, READ_REG_CMD, i, 0, 0);
/* CARD_PULL_CTLx */
for (i = 0xFD60; i <= 0xFD65; i++)
rtsx_usb_add_cmd(ucr, READ_REG_CMD, i, 0, 0);
/* CARD_DATA_SOURCE, CARD_SELECT, CARD_CLK_EN, CARD_PWR_CTL */
rtsx_usb_add_cmd(ucr, READ_REG_CMD, CARD_DATA_SOURCE, 0, 0);
rtsx_usb_add_cmd(ucr, READ_REG_CMD, CARD_SELECT, 0, 0);
rtsx_usb_add_cmd(ucr, READ_REG_CMD, CARD_CLK_EN, 0, 0);
rtsx_usb_add_cmd(ucr, READ_REG_CMD, CARD_PWR_CTL, 0, 0);
rtsx_usb_send_cmd(ucr, MODE_CR, 100);
rtsx_usb_get_rsp(ucr, 21, 100);
ptr = ucr->rsp_buf;
for (i = 0xFD40; i <= 0xFD44; i++)
dev_dbg(ms_dev(host), "0x%04X: 0x%02x\n", i, *(ptr++));
for (i = 0xFD51; i <= 0xFD56; i++)
dev_dbg(ms_dev(host), "0x%04X: 0x%02x\n", i, *(ptr++));
for (i = 0xFD60; i <= 0xFD65; i++)
dev_dbg(ms_dev(host), "0x%04X: 0x%02x\n", i, *(ptr++));
dev_dbg(ms_dev(host), "0x%04X: 0x%02x\n", CARD_DATA_SOURCE, *(ptr++));
dev_dbg(ms_dev(host), "0x%04X: 0x%02x\n", CARD_SELECT, *(ptr++));
dev_dbg(ms_dev(host), "0x%04X: 0x%02x\n", CARD_CLK_EN, *(ptr++));
dev_dbg(ms_dev(host), "0x%04X: 0x%02x\n", CARD_PWR_CTL, *(ptr++));
}
#else
static void ms_print_debug_regs(struct rtsx_usb_ms *host)
{
}
#endif
static int ms_pull_ctl_disable_lqfp48(struct rtsx_ucr *ucr)
{
rtsx_usb_init_cmd(ucr);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
return rtsx_usb_send_cmd(ucr, MODE_C, 100);
}
static int ms_pull_ctl_disable_qfn24(struct rtsx_ucr *ucr)
{
rtsx_usb_init_cmd(ucr);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x65);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x56);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x59);
return rtsx_usb_send_cmd(ucr, MODE_C, 100);
}
static int ms_pull_ctl_enable_lqfp48(struct rtsx_ucr *ucr)
{
rtsx_usb_init_cmd(ucr);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
return rtsx_usb_send_cmd(ucr, MODE_C, 100);
}
static int ms_pull_ctl_enable_qfn24(struct rtsx_ucr *ucr)
{
rtsx_usb_init_cmd(ucr);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x65);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x59);
return rtsx_usb_send_cmd(ucr, MODE_C, 100);
}
static int ms_power_on(struct rtsx_usb_ms *host)
{
struct rtsx_ucr *ucr = host->ucr;
int err;
dev_dbg(ms_dev(host), "%s\n", __func__);
rtsx_usb_init_cmd(ucr);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SELECT, 0x07, MS_MOD_SEL);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SHARE_MODE,
CARD_SHARE_MASK, CARD_SHARE_MS);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN,
MS_CLK_EN, MS_CLK_EN);
err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
if (err < 0)
return err;
if (CHECK_PKG(ucr, LQFP48))
err = ms_pull_ctl_enable_lqfp48(ucr);
else
err = ms_pull_ctl_enable_qfn24(ucr);
if (err < 0)
return err;
err = rtsx_usb_write_register(ucr, CARD_PWR_CTL,
POWER_MASK, PARTIAL_POWER_ON);
if (err)
return err;
usleep_range(800, 1000);
rtsx_usb_init_cmd(ucr);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
POWER_MASK, POWER_ON);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE,
MS_OUTPUT_EN, MS_OUTPUT_EN);
return rtsx_usb_send_cmd(ucr, MODE_C, 100);
}
static int ms_power_off(struct rtsx_usb_ms *host)
{
struct rtsx_ucr *ucr = host->ucr;
int err;
dev_dbg(ms_dev(host), "%s\n", __func__);
rtsx_usb_init_cmd(ucr);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN, MS_CLK_EN, 0);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE, MS_OUTPUT_EN, 0);
err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
if (err < 0)
return err;
if (CHECK_PKG(ucr, LQFP48))
return ms_pull_ctl_disable_lqfp48(ucr);
return ms_pull_ctl_disable_qfn24(ucr);
}
static int ms_transfer_data(struct rtsx_usb_ms *host, unsigned char data_dir,
u8 tpc, u8 cfg, struct scatterlist *sg)
{
struct rtsx_ucr *ucr = host->ucr;
int err;
unsigned int length = sg->length;
u16 sec_cnt = (u16)(length / 512);
u8 trans_mode, dma_dir, flag;
unsigned int pipe;
struct memstick_dev *card = host->msh->card;
dev_dbg(ms_dev(host), "%s: tpc = 0x%02x, data_dir = %s, length = %d\n",
__func__, tpc, (data_dir == READ) ? "READ" : "WRITE",
length);
if (data_dir == READ) {
flag = MODE_CDIR;
dma_dir = DMA_DIR_FROM_CARD;
if (card->id.type != MEMSTICK_TYPE_PRO)
trans_mode = MS_TM_NORMAL_READ;
else
trans_mode = MS_TM_AUTO_READ;
pipe = usb_rcvbulkpipe(ucr->pusb_dev, EP_BULK_IN);
} else {
flag = MODE_CDOR;
dma_dir = DMA_DIR_TO_CARD;
if (card->id.type != MEMSTICK_TYPE_PRO)
trans_mode = MS_TM_NORMAL_WRITE;
else
trans_mode = MS_TM_AUTO_WRITE;
pipe = usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT);
}
rtsx_usb_init_cmd(ucr);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_TPC, 0xFF, tpc);
if (card->id.type == MEMSTICK_TYPE_PRO) {
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_SECTOR_CNT_H,
0xFF, (u8)(sec_cnt >> 8));
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_SECTOR_CNT_L,
0xFF, (u8)sec_cnt);
}
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_TRANS_CFG, 0xFF, cfg);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC3,
0xFF, (u8)(length >> 24));
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC2,
0xFF, (u8)(length >> 16));
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC1,
0xFF, (u8)(length >> 8));
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC0, 0xFF,
(u8)length);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
0x03 | DMA_PACK_SIZE_MASK, dma_dir | DMA_EN | DMA_512);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
0x01, RING_BUFFER);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_TRANSFER,
0xFF, MS_TRANSFER_START | trans_mode);
rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, MS_TRANSFER,
MS_TRANSFER_END, MS_TRANSFER_END);
err = rtsx_usb_send_cmd(ucr, flag | STAGE_MS_STATUS, 100);
if (err)
return err;
err = rtsx_usb_transfer_data(ucr, pipe, sg, length,
1, NULL, 10000);
if (err)
goto err_out;
err = rtsx_usb_get_rsp(ucr, 3, 15000);
if (err)
goto err_out;
if (ucr->rsp_buf[0] & MS_TRANSFER_ERR ||
ucr->rsp_buf[1] & (MS_CRC16_ERR | MS_RDY_TIMEOUT)) {
err = -EIO;
goto err_out;
}
return 0;
err_out:
ms_clear_error(host);
return err;
}
static int ms_write_bytes(struct rtsx_usb_ms *host, u8 tpc,
u8 cfg, u8 cnt, u8 *data, u8 *int_reg)
{
struct rtsx_ucr *ucr = host->ucr;
int err, i;
dev_dbg(ms_dev(host), "%s: tpc = 0x%02x\n", __func__, tpc);
rtsx_usb_init_cmd(ucr);
for (i = 0; i < cnt; i++)
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
PPBUF_BASE2 + i, 0xFF, data[i]);
if (cnt % 2)
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
PPBUF_BASE2 + i, 0xFF, 0xFF);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_TPC, 0xFF, tpc);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_BYTE_CNT, 0xFF, cnt);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_TRANS_CFG, 0xFF, cfg);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
0x01, PINGPONG_BUFFER);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_TRANSFER,
0xFF, MS_TRANSFER_START | MS_TM_WRITE_BYTES);
rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, MS_TRANSFER,
MS_TRANSFER_END, MS_TRANSFER_END);
rtsx_usb_add_cmd(ucr, READ_REG_CMD, MS_TRANS_CFG, 0, 0);
err = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
if (err)
return err;
err = rtsx_usb_get_rsp(ucr, 2, 5000);
if (err || (ucr->rsp_buf[0] & MS_TRANSFER_ERR)) {
u8 val;
rtsx_usb_ep0_read_register(ucr, MS_TRANS_CFG, &val);
dev_dbg(ms_dev(host), "MS_TRANS_CFG: 0x%02x\n", val);
if (int_reg)
*int_reg = val & 0x0F;
ms_print_debug_regs(host);
ms_clear_error(host);
if (!(tpc & 0x08)) {
if (val & MS_CRC16_ERR)
return -EIO;
} else {
if (!(val & 0x80)) {
if (val & (MS_INT_ERR | MS_INT_CMDNK))
return -EIO;
}
}
return -ETIMEDOUT;
}
if (int_reg)
*int_reg = ucr->rsp_buf[1] & 0x0F;
return 0;
}
static int ms_read_bytes(struct rtsx_usb_ms *host, u8 tpc,
u8 cfg, u8 cnt, u8 *data, u8 *int_reg)
{
struct rtsx_ucr *ucr = host->ucr;
int err, i;
u8 *ptr;
dev_dbg(ms_dev(host), "%s: tpc = 0x%02x\n", __func__, tpc);
rtsx_usb_init_cmd(ucr);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_TPC, 0xFF, tpc);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_BYTE_CNT, 0xFF, cnt);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_TRANS_CFG, 0xFF, cfg);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
0x01, PINGPONG_BUFFER);
rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MS_TRANSFER,
0xFF, MS_TRANSFER_START | MS_TM_READ_BYTES);
rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, MS_TRANSFER,
MS_TRANSFER_END, MS_TRANSFER_END);
for (i = 0; i < cnt - 1; i++)
rtsx_usb_add_cmd(ucr, READ_REG_CMD, PPBUF_BASE2 + i, 0, 0);
if (cnt % 2)
rtsx_usb_add_cmd(ucr, READ_REG_CMD, PPBUF_BASE2 + cnt, 0, 0);
else
rtsx_usb_add_cmd(ucr, READ_REG_CMD,
PPBUF_BASE2 + cnt - 1, 0, 0);
rtsx_usb_add_cmd(ucr, READ_REG_CMD, MS_TRANS_CFG, 0, 0);
err = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
if (err)
return err;
err = rtsx_usb_get_rsp(ucr, cnt + 2, 5000);
if (err || (ucr->rsp_buf[0] & MS_TRANSFER_ERR)) {
u8 val;
rtsx_usb_ep0_read_register(ucr, MS_TRANS_CFG, &val);
dev_dbg(ms_dev(host), "MS_TRANS_CFG: 0x%02x\n", val);
if (int_reg && (host->ifmode != MEMSTICK_SERIAL))
*int_reg = val & 0x0F;
ms_print_debug_regs(host);
ms_clear_error(host);
if (!(tpc & 0x08)) {
if (val & MS_CRC16_ERR)
return -EIO;
} else {
if (!(val & 0x80)) {
if (val & (MS_INT_ERR | MS_INT_CMDNK))
return -EIO;
}
}
return -ETIMEDOUT;
}
ptr = ucr->rsp_buf + 1;
for (i = 0; i < cnt; i++)
data[i] = *ptr++;
if (int_reg && (host->ifmode != MEMSTICK_SERIAL))
*int_reg = *ptr & 0x0F;
return 0;
}
static int rtsx_usb_ms_issue_cmd(struct rtsx_usb_ms *host)
{
struct memstick_request *req = host->req;
int err = 0;
u8 cfg = 0, int_reg;
dev_dbg(ms_dev(host), "%s\n", __func__);
if (req->need_card_int) {
if (host->ifmode != MEMSTICK_SERIAL)
cfg = WAIT_INT;
}
if (req->long_data) {
err = ms_transfer_data(host, req->data_dir,
req->tpc, cfg, &(req->sg));
} else {
if (req->data_dir == READ)
err = ms_read_bytes(host, req->tpc, cfg,
req->data_len, req->data, &int_reg);
else
err = ms_write_bytes(host, req->tpc, cfg,
req->data_len, req->data, &int_reg);
}
if (err < 0)
return err;
if (req->need_card_int) {
if (host->ifmode == MEMSTICK_SERIAL) {
err = ms_read_bytes(host, MS_TPC_GET_INT,
NO_WAIT_INT, 1, &req->int_reg, NULL);
if (err < 0)
return err;
} else {
if (int_reg & MS_INT_CMDNK)
req->int_reg |= MEMSTICK_INT_CMDNAK;
if (int_reg & MS_INT_BREQ)
req->int_reg |= MEMSTICK_INT_BREQ;
if (int_reg & MS_INT_ERR)
req->int_reg |= MEMSTICK_INT_ERR;
if (int_reg & MS_INT_CED)
req->int_reg |= MEMSTICK_INT_CED;
}
dev_dbg(ms_dev(host), "int_reg: 0x%02x\n", req->int_reg);
}
return 0;
}
static void rtsx_usb_ms_handle_req(struct work_struct *work)
{
struct rtsx_usb_ms *host = container_of(work,
struct rtsx_usb_ms, handle_req);
struct rtsx_ucr *ucr = host->ucr;
struct memstick_host *msh = host->msh;
int rc;
if (!host->req) {
do {
rc = memstick_next_req(msh, &host->req);
dev_dbg(ms_dev(host), "next req %d\n", rc);
if (!rc) {
mutex_lock(&ucr->dev_mutex);
if (rtsx_usb_card_exclusive_check(ucr,
RTSX_USB_MS_CARD))
host->req->error = -EIO;
else
host->req->error =
rtsx_usb_ms_issue_cmd(host);
mutex_unlock(&ucr->dev_mutex);
dev_dbg(ms_dev(host), "req result %d\n",
host->req->error);
}
} while (!rc);
}
}
static void rtsx_usb_ms_request(struct memstick_host *msh)
{
struct rtsx_usb_ms *host = memstick_priv(msh);
dev_dbg(ms_dev(host), "--> %s\n", __func__);
if (!host->eject)
schedule_work(&host->handle_req);
}
static int rtsx_usb_ms_set_param(struct memstick_host *msh,
enum memstick_param param, int value)
{
struct rtsx_usb_ms *host = memstick_priv(msh);
struct rtsx_ucr *ucr = host->ucr;
unsigned int clock = 0;
u8 ssc_depth = 0;
int err;
dev_dbg(ms_dev(host), "%s: param = %d, value = %d\n",
__func__, param, value);
mutex_lock(&ucr->dev_mutex);
err = rtsx_usb_card_exclusive_check(ucr, RTSX_USB_MS_CARD);
if (err)
goto out;
switch (param) {
case MEMSTICK_POWER:
if (value == host->power_mode)
break;
if (value == MEMSTICK_POWER_ON) {
pm_runtime_get_sync(ms_dev(host));
err = ms_power_on(host);
} else if (value == MEMSTICK_POWER_OFF) {
err = ms_power_off(host);
if (host->msh->card)
pm_runtime_put_noidle(ms_dev(host));
else
pm_runtime_put(ms_dev(host));
} else
err = -EINVAL;
if (!err)
host->power_mode = value;
break;
case MEMSTICK_INTERFACE:
if (value == MEMSTICK_SERIAL) {
clock = 19000000;
ssc_depth = SSC_DEPTH_512K;
err = rtsx_usb_write_register(ucr, MS_CFG, 0x5A,
MS_BUS_WIDTH_1 | PUSH_TIME_DEFAULT);
if (err < 0)
break;
} else if (value == MEMSTICK_PAR4) {
clock = 39000000;
ssc_depth = SSC_DEPTH_1M;
err = rtsx_usb_write_register(ucr, MS_CFG, 0x5A,
MS_BUS_WIDTH_4 | PUSH_TIME_ODD |
MS_NO_CHECK_INT);
if (err < 0)
break;
} else {
err = -EINVAL;
break;
}
err = rtsx_usb_switch_clock(ucr, clock,
ssc_depth, false, true, false);
if (err < 0) {
dev_dbg(ms_dev(host), "switch clock failed\n");
break;
}
host->ssc_depth = ssc_depth;
host->clock = clock;
host->ifmode = value;
break;
default:
err = -EINVAL;
break;
}
out:
mutex_unlock(&ucr->dev_mutex);
/* power-on delay */
if (param == MEMSTICK_POWER && value == MEMSTICK_POWER_ON)
usleep_range(10000, 12000);
dev_dbg(ms_dev(host), "%s: return = %d\n", __func__, err);
return err;
}
#ifdef CONFIG_PM_SLEEP
static int rtsx_usb_ms_suspend(struct device *dev)
{
struct rtsx_usb_ms *host = dev_get_drvdata(dev);
struct memstick_host *msh = host->msh;
dev_dbg(ms_dev(host), "--> %s\n", __func__);
memstick_suspend_host(msh);
return 0;
}
static int rtsx_usb_ms_resume(struct device *dev)
{
struct rtsx_usb_ms *host = dev_get_drvdata(dev);
struct memstick_host *msh = host->msh;
dev_dbg(ms_dev(host), "--> %s\n", __func__);
memstick_resume_host(msh);
return 0;
}
#endif /* CONFIG_PM_SLEEP */
/*
* Thread function of ms card slot detection. The thread starts right after
* successful host addition. It stops while the driver removal function sets
* host->eject true.
*/
static int rtsx_usb_detect_ms_card(void *__host)
{
struct rtsx_usb_ms *host = (struct rtsx_usb_ms *)__host;
struct rtsx_ucr *ucr = host->ucr;
u8 val = 0;
int err;
for (;;) {
mutex_lock(&ucr->dev_mutex);
/* Check pending MS card changes */
err = rtsx_usb_read_register(ucr, CARD_INT_PEND, &val);
if (err) {
mutex_unlock(&ucr->dev_mutex);
goto poll_again;
}
/* Clear the pending */
rtsx_usb_write_register(ucr, CARD_INT_PEND,
XD_INT | MS_INT | SD_INT,
XD_INT | MS_INT | SD_INT);
mutex_unlock(&ucr->dev_mutex);
if (val & MS_INT) {
dev_dbg(ms_dev(host), "MS slot change detected\n");
memstick_detect_change(host->msh);
}
poll_again:
if (host->eject)
break;
schedule_timeout_idle(HZ);
}
complete(&host->detect_ms_exit);
return 0;
}
static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
{
struct memstick_host *msh;
struct rtsx_usb_ms *host;
struct rtsx_ucr *ucr;
int err;
ucr = usb_get_intfdata(to_usb_interface(pdev->dev.parent));
if (!ucr)
return -ENXIO;
dev_dbg(&(pdev->dev),
"Realtek USB Memstick controller found\n");
msh = memstick_alloc_host(sizeof(*host), &pdev->dev);
if (!msh)
return -ENOMEM;
host = memstick_priv(msh);
host->ucr = ucr;
host->msh = msh;
host->pdev = pdev;
host->power_mode = MEMSTICK_POWER_OFF;
platform_set_drvdata(pdev, host);
mutex_init(&host->host_mutex);
INIT_WORK(&host->handle_req, rtsx_usb_ms_handle_req);
init_completion(&host->detect_ms_exit);
host->detect_ms = kthread_create(rtsx_usb_detect_ms_card, host,
"rtsx_usb_ms_%d", pdev->id);
if (IS_ERR(host->detect_ms)) {
dev_dbg(&(pdev->dev),
"Unable to create polling thread.\n");
err = PTR_ERR(host->detect_ms);
goto err_out;
}
msh->request = rtsx_usb_ms_request;
msh->set_param = rtsx_usb_ms_set_param;
msh->caps = MEMSTICK_CAP_PAR4;
pm_runtime_enable(&pdev->dev);
err = memstick_add_host(msh);
if (err)
goto err_out;
wake_up_process(host->detect_ms);
return 0;
err_out:
memstick_free_host(msh);
return err;
}
static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
{
struct rtsx_usb_ms *host = platform_get_drvdata(pdev);
struct memstick_host *msh;
int err;
msh = host->msh;
host->eject = true;
cancel_work_sync(&host->handle_req);
mutex_lock(&host->host_mutex);
if (host->req) {
dev_dbg(&(pdev->dev),
"%s: Controller removed during transfer\n",
dev_name(&msh->dev));
host->req->error = -ENOMEDIUM;
do {
err = memstick_next_req(msh, &host->req);
if (!err)
host->req->error = -ENOMEDIUM;
} while (!err);
}
mutex_unlock(&host->host_mutex);
wait_for_completion(&host->detect_ms_exit);
memstick_remove_host(msh);
memstick_free_host(msh);
/* Balance possible unbalanced usage count
* e.g. unconditional module removal
*/
if (pm_runtime_active(ms_dev(host)))
pm_runtime_put(ms_dev(host));
pm_runtime_disable(&pdev->dev);
platform_set_drvdata(pdev, NULL);
dev_dbg(&(pdev->dev),
": Realtek USB Memstick controller has been removed\n");
return 0;
}
static SIMPLE_DEV_PM_OPS(rtsx_usb_ms_pm_ops,
rtsx_usb_ms_suspend, rtsx_usb_ms_resume);
static struct platform_device_id rtsx_usb_ms_ids[] = {
{
.name = "rtsx_usb_ms",
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, rtsx_usb_ms_ids);
static struct platform_driver rtsx_usb_ms_driver = {
.probe = rtsx_usb_ms_drv_probe,
.remove = rtsx_usb_ms_drv_remove,
.id_table = rtsx_usb_ms_ids,
.driver = {
.name = "rtsx_usb_ms",
.pm = &rtsx_usb_ms_pm_ops,
},
};
module_platform_driver(rtsx_usb_ms_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Roger Tseng <rogerable@realtek.com>");
MODULE_DESCRIPTION("Realtek USB Memstick Card Host Driver");
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