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linux/drivers/mmc/host/sdricoh_cs.c
Ulf Hansson 04f2f45f41 mmc: sdricoh_cs: Respect the cmd->busy_timeout from the mmc core 
Using a fixed 1s polling timeout for all commands is a bit problematic.

For some commands it means waiting longer than needed for the polling to be
aborted, which may not a big issue, but still. For other commands, like for
an erase (CMD38) that uses a R1B response, may require longer timeouts than
1s. In these cases, we may end up treating the command as it failed, while
it just needed some more time to complete successfully.

Fix the problem by respecting the cmd->busy_timeout, which is provided by
the mmc core.

Note that, even if the sdricoh_cs driver may currently not support HW busy
detection on DAT0, some comments in the code refer to that the HW may
support it. Therefore, it seems better to be proactive in this case.

Cc: Sascha Sommer <saschasommer@freenet.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20200508095228.14230-1-ulf.hansson@linaro.org
2020-05-28 11:22:14 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* sdricoh_cs.c - driver for Ricoh Secure Digital Card Readers that can be
* found on some Ricoh RL5c476 II cardbus bridge
*
* Copyright (C) 2006 - 2008 Sascha Sommer <saschasommer@freenet.de>
*/
/*
#define DEBUG
#define VERBOSE_DEBUG
*/
#include <linux/delay.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/iopoll.h>
#include <linux/scatterlist.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/ds.h>
#include <linux/io.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#define DRIVER_NAME "sdricoh_cs"
static unsigned int switchlocked;
/* i/o region */
#define SDRICOH_PCI_REGION 0
#define SDRICOH_PCI_REGION_SIZE 0x1000
/* registers */
#define R104_VERSION 0x104
#define R200_CMD 0x200
#define R204_CMD_ARG 0x204
#define R208_DATAIO 0x208
#define R20C_RESP 0x20c
#define R21C_STATUS 0x21c
#define R2E0_INIT 0x2e0
#define R2E4_STATUS_RESP 0x2e4
#define R2F0_RESET 0x2f0
#define R224_MODE 0x224
#define R226_BLOCKSIZE 0x226
#define R228_POWER 0x228
#define R230_DATA 0x230
/* flags for the R21C_STATUS register */
#define STATUS_CMD_FINISHED 0x00000001
#define STATUS_TRANSFER_FINISHED 0x00000004
#define STATUS_CARD_INSERTED 0x00000020
#define STATUS_CARD_LOCKED 0x00000080
#define STATUS_CMD_TIMEOUT 0x00400000
#define STATUS_READY_TO_READ 0x01000000
#define STATUS_READY_TO_WRITE 0x02000000
#define STATUS_BUSY 0x40000000
/* timeouts */
#define SDRICOH_CMD_TIMEOUT_US 1000000
#define SDRICOH_DATA_TIMEOUT_US 1000000
/* list of supported pcmcia devices */
static const struct pcmcia_device_id pcmcia_ids[] = {
/* vendor and device strings followed by their crc32 hashes */
PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay1Controller", 0xd9f522ed,
0xc3901202),
PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay Controller", 0xd9f522ed,
0xace80909),
PCMCIA_DEVICE_NULL,
};
MODULE_DEVICE_TABLE(pcmcia, pcmcia_ids);
/* mmc privdata */
struct sdricoh_host {
struct device *dev;
struct mmc_host *mmc; /* MMC structure */
unsigned char __iomem *iobase;
struct pci_dev *pci_dev;
int app_cmd;
};
/***************** register i/o helper functions *****************************/
static inline unsigned int sdricoh_readl(struct sdricoh_host *host,
unsigned int reg)
{
unsigned int value = readl(host->iobase + reg);
dev_vdbg(host->dev, "rl %x 0x%x\n", reg, value);
return value;
}
static inline void sdricoh_writel(struct sdricoh_host *host, unsigned int reg,
unsigned int value)
{
writel(value, host->iobase + reg);
dev_vdbg(host->dev, "wl %x 0x%x\n", reg, value);
}
static inline unsigned int sdricoh_readw(struct sdricoh_host *host,
unsigned int reg)
{
unsigned int value = readw(host->iobase + reg);
dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
return value;
}
static inline void sdricoh_writew(struct sdricoh_host *host, unsigned int reg,
unsigned short value)
{
writew(value, host->iobase + reg);
dev_vdbg(host->dev, "ww %x 0x%x\n", reg, value);
}
static inline unsigned int sdricoh_readb(struct sdricoh_host *host,
unsigned int reg)
{
unsigned int value = readb(host->iobase + reg);
dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
return value;
}
static bool sdricoh_status_ok(struct sdricoh_host *host, unsigned int status,
unsigned int wanted)
{
sdricoh_writel(host, R2E4_STATUS_RESP, status);
return status & wanted;
}
static int sdricoh_query_status(struct sdricoh_host *host, unsigned int wanted)
{
int ret;
unsigned int status = 0;
struct device *dev = host->dev;
ret = read_poll_timeout(sdricoh_readl, status,
sdricoh_status_ok(host, status, wanted),
32, SDRICOH_DATA_TIMEOUT_US, false,
host, R21C_STATUS);
if (ret) {
dev_err(dev, "query_status: timeout waiting for %x\n", wanted);
return -ETIMEDOUT;
}
/* do not do this check in the loop as some commands fail otherwise */
if (status & 0x7F0000) {
dev_err(dev, "waiting for status bit %x failed\n", wanted);
return -EINVAL;
}
return 0;
}
static int sdricoh_mmc_cmd(struct sdricoh_host *host, struct mmc_command *cmd)
{
unsigned int status, timeout_us;
int ret;
unsigned char opcode = cmd->opcode;
/* reset status reg? */
sdricoh_writel(host, R21C_STATUS, 0x18);
/* MMC_APP_CMDs need some special handling */
if (host->app_cmd) {
opcode |= 64;
host->app_cmd = 0;
} else if (opcode == MMC_APP_CMD)
host->app_cmd = 1;
/* fill parameters */
sdricoh_writel(host, R204_CMD_ARG, cmd->arg);
sdricoh_writel(host, R200_CMD, (0x10000 << 8) | opcode);
/* wait for command completion */
if (!opcode)
return 0;
timeout_us = cmd->busy_timeout ? cmd->busy_timeout * 1000 :
SDRICOH_CMD_TIMEOUT_US;
ret = read_poll_timeout(sdricoh_readl, status,
sdricoh_status_ok(host, status, STATUS_CMD_FINISHED),
32, timeout_us, false,
host, R21C_STATUS);
/*
* Don't check for timeout status in the loop, as it's not always reset
* correctly.
*/
if (ret || status & STATUS_CMD_TIMEOUT)
return -ETIMEDOUT;
return 0;
}
static int sdricoh_reset(struct sdricoh_host *host)
{
dev_dbg(host->dev, "reset\n");
sdricoh_writel(host, R2F0_RESET, 0x10001);
sdricoh_writel(host, R2E0_INIT, 0x10000);
if (sdricoh_readl(host, R2E0_INIT) != 0x10000)
return -EIO;
sdricoh_writel(host, R2E0_INIT, 0x10007);
sdricoh_writel(host, R224_MODE, 0x2000000);
sdricoh_writel(host, R228_POWER, 0xe0);
/* status register ? */
sdricoh_writel(host, R21C_STATUS, 0x18);
return 0;
}
static int sdricoh_blockio(struct sdricoh_host *host, int read,
u8 *buf, int len)
{
int size;
u32 data = 0;
/* wait until the data is available */
if (read) {
if (sdricoh_query_status(host, STATUS_READY_TO_READ))
return -ETIMEDOUT;
sdricoh_writel(host, R21C_STATUS, 0x18);
/* read data */
while (len) {
data = sdricoh_readl(host, R230_DATA);
size = min(len, 4);
len -= size;
while (size) {
*buf = data & 0xFF;
buf++;
data >>= 8;
size--;
}
}
} else {
if (sdricoh_query_status(host, STATUS_READY_TO_WRITE))
return -ETIMEDOUT;
sdricoh_writel(host, R21C_STATUS, 0x18);
/* write data */
while (len) {
size = min(len, 4);
len -= size;
while (size) {
data >>= 8;
data |= (u32)*buf << 24;
buf++;
size--;
}
sdricoh_writel(host, R230_DATA, data);
}
}
return 0;
}
static void sdricoh_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct sdricoh_host *host = mmc_priv(mmc);
struct mmc_command *cmd = mrq->cmd;
struct mmc_data *data = cmd->data;
struct device *dev = host->dev;
int i;
dev_dbg(dev, "=============================\n");
dev_dbg(dev, "sdricoh_request opcode=%i\n", cmd->opcode);
sdricoh_writel(host, R21C_STATUS, 0x18);
/* read/write commands seem to require this */
if (data) {
sdricoh_writew(host, R226_BLOCKSIZE, data->blksz);
sdricoh_writel(host, R208_DATAIO, 0);
}
cmd->error = sdricoh_mmc_cmd(host, cmd);
/* read response buffer */
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136) {
/* CRC is stripped so we need to do some shifting. */
for (i = 0; i < 4; i++) {
cmd->resp[i] =
sdricoh_readl(host,
R20C_RESP + (3 - i) * 4) << 8;
if (i != 3)
cmd->resp[i] |=
sdricoh_readb(host, R20C_RESP +
(3 - i) * 4 - 1);
}
} else
cmd->resp[0] = sdricoh_readl(host, R20C_RESP);
}
/* transfer data */
if (data && cmd->error == 0) {
dev_dbg(dev, "transfer: blksz %i blocks %i sg_len %i "
"sg length %i\n", data->blksz, data->blocks,
data->sg_len, data->sg->length);
/* enter data reading mode */
sdricoh_writel(host, R21C_STATUS, 0x837f031e);
for (i = 0; i < data->blocks; i++) {
size_t len = data->blksz;
u8 *buf;
struct page *page;
int result;
page = sg_page(data->sg);
buf = kmap(page) + data->sg->offset + (len * i);
result =
sdricoh_blockio(host,
data->flags & MMC_DATA_READ, buf, len);
kunmap(page);
flush_dcache_page(page);
if (result) {
dev_err(dev, "sdricoh_request: cmd %i "
"block transfer failed\n", cmd->opcode);
cmd->error = result;
break;
} else
data->bytes_xfered += len;
}
sdricoh_writel(host, R208_DATAIO, 1);
if (sdricoh_query_status(host, STATUS_TRANSFER_FINISHED)) {
dev_err(dev, "sdricoh_request: transfer end error\n");
cmd->error = -EINVAL;
}
}
/* FIXME check busy flag */
mmc_request_done(mmc, mrq);
dev_dbg(dev, "=============================\n");
}
static void sdricoh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct sdricoh_host *host = mmc_priv(mmc);
dev_dbg(host->dev, "set_ios\n");
if (ios->power_mode == MMC_POWER_ON) {
sdricoh_writel(host, R228_POWER, 0xc0e0);
if (ios->bus_width == MMC_BUS_WIDTH_4) {
sdricoh_writel(host, R224_MODE, 0x2000300);
sdricoh_writel(host, R228_POWER, 0x40e0);
} else {
sdricoh_writel(host, R224_MODE, 0x2000340);
}
} else if (ios->power_mode == MMC_POWER_UP) {
sdricoh_writel(host, R224_MODE, 0x2000320);
sdricoh_writel(host, R228_POWER, 0xe0);
}
}
static int sdricoh_get_ro(struct mmc_host *mmc)
{
struct sdricoh_host *host = mmc_priv(mmc);
unsigned int status;
status = sdricoh_readl(host, R21C_STATUS);
sdricoh_writel(host, R2E4_STATUS_RESP, status);
/* some notebooks seem to have the locked flag switched */
if (switchlocked)
return !(status & STATUS_CARD_LOCKED);
return (status & STATUS_CARD_LOCKED);
}
static const struct mmc_host_ops sdricoh_ops = {
.request = sdricoh_request,
.set_ios = sdricoh_set_ios,
.get_ro = sdricoh_get_ro,
};
/* initialize the control and register it to the mmc framework */
static int sdricoh_init_mmc(struct pci_dev *pci_dev,
struct pcmcia_device *pcmcia_dev)
{
int result;
void __iomem *iobase;
struct mmc_host *mmc;
struct sdricoh_host *host;
struct device *dev = &pcmcia_dev->dev;
/* map iomem */
if (pci_resource_len(pci_dev, SDRICOH_PCI_REGION) !=
SDRICOH_PCI_REGION_SIZE) {
dev_dbg(dev, "unexpected pci resource len\n");
return -ENODEV;
}
iobase =
pci_iomap(pci_dev, SDRICOH_PCI_REGION, SDRICOH_PCI_REGION_SIZE);
if (!iobase) {
dev_err(dev, "unable to map iobase\n");
return -ENODEV;
}
/* check version? */
if (readl(iobase + R104_VERSION) != 0x4000) {
dev_dbg(dev, "no supported mmc controller found\n");
result = -ENODEV;
goto unmap_io;
}
/* allocate privdata */
mmc = pcmcia_dev->priv =
mmc_alloc_host(sizeof(struct sdricoh_host), &pcmcia_dev->dev);
if (!mmc) {
dev_err(dev, "mmc_alloc_host failed\n");
result = -ENOMEM;
goto unmap_io;
}
host = mmc_priv(mmc);
host->iobase = iobase;
host->dev = dev;
host->pci_dev = pci_dev;
mmc->ops = &sdricoh_ops;
/* FIXME: frequency and voltage handling is done by the controller
*/
mmc->f_min = 450000;
mmc->f_max = 24000000;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
mmc->caps |= MMC_CAP_4_BIT_DATA;
mmc->max_seg_size = 1024 * 512;
mmc->max_blk_size = 512;
/* reset the controller */
if (sdricoh_reset(host)) {
dev_dbg(dev, "could not reset\n");
result = -EIO;
goto free_host;
}
result = mmc_add_host(mmc);
if (!result) {
dev_dbg(dev, "mmc host registered\n");
return 0;
}
free_host:
mmc_free_host(mmc);
unmap_io:
pci_iounmap(pci_dev, iobase);
return result;
}
/* search for supported mmc controllers */
static int sdricoh_pcmcia_probe(struct pcmcia_device *pcmcia_dev)
{
struct pci_dev *pci_dev = NULL;
dev_info(&pcmcia_dev->dev, "Searching MMC controller for pcmcia device"
" %s %s ...\n", pcmcia_dev->prod_id[0], pcmcia_dev->prod_id[1]);
/* search pci cardbus bridge that contains the mmc controller */
/* the io region is already claimed by yenta_socket... */
while ((pci_dev =
pci_get_device(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_RL5C476,
pci_dev))) {
/* try to init the device */
if (!sdricoh_init_mmc(pci_dev, pcmcia_dev)) {
dev_info(&pcmcia_dev->dev, "MMC controller found\n");
return 0;
}
}
dev_err(&pcmcia_dev->dev, "No MMC controller was found.\n");
return -ENODEV;
}
static void sdricoh_pcmcia_detach(struct pcmcia_device *link)
{
struct mmc_host *mmc = link->priv;
dev_dbg(&link->dev, "detach\n");
/* remove mmc host */
if (mmc) {
struct sdricoh_host *host = mmc_priv(mmc);
mmc_remove_host(mmc);
pci_iounmap(host->pci_dev, host->iobase);
pci_dev_put(host->pci_dev);
mmc_free_host(mmc);
}
pcmcia_disable_device(link);
}
#ifdef CONFIG_PM
static int sdricoh_pcmcia_suspend(struct pcmcia_device *link)
{
dev_dbg(&link->dev, "suspend\n");
return 0;
}
static int sdricoh_pcmcia_resume(struct pcmcia_device *link)
{
struct mmc_host *mmc = link->priv;
dev_dbg(&link->dev, "resume\n");
sdricoh_reset(mmc_priv(mmc));
return 0;
}
#else
#define sdricoh_pcmcia_suspend NULL
#define sdricoh_pcmcia_resume NULL
#endif
static struct pcmcia_driver sdricoh_driver = {
.name = DRIVER_NAME,
.probe = sdricoh_pcmcia_probe,
.remove = sdricoh_pcmcia_detach,
.id_table = pcmcia_ids,
.suspend = sdricoh_pcmcia_suspend,
.resume = sdricoh_pcmcia_resume,
};
module_pcmcia_driver(sdricoh_driver);
module_param(switchlocked, uint, 0444);
MODULE_AUTHOR("Sascha Sommer <saschasommer@freenet.de>");
MODULE_DESCRIPTION("Ricoh PCMCIA Secure Digital Interface driver");
MODULE_LICENSE("GPL");
MODULE_PARM_DESC(switchlocked, "Switch the cards locked status."
"Use this when unlocked cards are shown readonly (default 0)");
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