![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
821 lines
19 KiB
C
821 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/drivers/mmc/host/pxa.c - PXA MMCI driver
|
|
*
|
|
* Copyright (C) 2003 Russell King, All Rights Reserved.
|
|
*
|
|
* This hardware is really sick:
|
|
* - No way to clear interrupts.
|
|
* - Have to turn off the clock whenever we touch the device.
|
|
* - Doesn't tell you how many data blocks were transferred.
|
|
* Yuck!
|
|
*
|
|
* 1 and 3 byte data transfers not supported
|
|
* max block length up to 1023
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mmc/host.h>
|
|
#include <linux/mmc/slot-gpio.h>
|
|
#include <linux/io.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
|
|
#include <linux/sizes.h>
|
|
|
|
#include <mach/hardware.h>
|
|
#include <linux/platform_data/mmc-pxamci.h>
|
|
|
|
#include "pxamci.h"
|
|
|
|
#define DRIVER_NAME "pxa2xx-mci"
|
|
|
|
#define NR_SG 1
|
|
#define CLKRT_OFF (~0)
|
|
|
|
#define mmc_has_26MHz() (cpu_is_pxa300() || cpu_is_pxa310() \
|
|
|| cpu_is_pxa935())
|
|
|
|
struct pxamci_host {
|
|
struct mmc_host *mmc;
|
|
spinlock_t lock;
|
|
struct resource *res;
|
|
void __iomem *base;
|
|
struct clk *clk;
|
|
unsigned long clkrate;
|
|
unsigned int clkrt;
|
|
unsigned int cmdat;
|
|
unsigned int imask;
|
|
unsigned int power_mode;
|
|
unsigned long detect_delay_ms;
|
|
bool use_ro_gpio;
|
|
struct gpio_desc *power;
|
|
struct pxamci_platform_data *pdata;
|
|
|
|
struct mmc_request *mrq;
|
|
struct mmc_command *cmd;
|
|
struct mmc_data *data;
|
|
|
|
struct dma_chan *dma_chan_rx;
|
|
struct dma_chan *dma_chan_tx;
|
|
dma_cookie_t dma_cookie;
|
|
unsigned int dma_len;
|
|
unsigned int dma_dir;
|
|
};
|
|
|
|
static int pxamci_init_ocr(struct pxamci_host *host)
|
|
{
|
|
struct mmc_host *mmc = host->mmc;
|
|
int ret;
|
|
|
|
ret = mmc_regulator_get_supply(mmc);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (IS_ERR(mmc->supply.vmmc)) {
|
|
/* fall-back to platform data */
|
|
mmc->ocr_avail = host->pdata ?
|
|
host->pdata->ocr_mask :
|
|
MMC_VDD_32_33 | MMC_VDD_33_34;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int pxamci_set_power(struct pxamci_host *host,
|
|
unsigned char power_mode,
|
|
unsigned int vdd)
|
|
{
|
|
struct mmc_host *mmc = host->mmc;
|
|
struct regulator *supply = mmc->supply.vmmc;
|
|
|
|
if (!IS_ERR(supply))
|
|
return mmc_regulator_set_ocr(mmc, supply, vdd);
|
|
|
|
if (host->power) {
|
|
bool on = !!((1 << vdd) & host->pdata->ocr_mask);
|
|
gpiod_set_value(host->power, on);
|
|
}
|
|
|
|
if (host->pdata && host->pdata->setpower)
|
|
return host->pdata->setpower(mmc_dev(host->mmc), vdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pxamci_stop_clock(struct pxamci_host *host)
|
|
{
|
|
if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
|
|
unsigned long timeout = 10000;
|
|
unsigned int v;
|
|
|
|
writel(STOP_CLOCK, host->base + MMC_STRPCL);
|
|
|
|
do {
|
|
v = readl(host->base + MMC_STAT);
|
|
if (!(v & STAT_CLK_EN))
|
|
break;
|
|
udelay(1);
|
|
} while (timeout--);
|
|
|
|
if (v & STAT_CLK_EN)
|
|
dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
|
|
}
|
|
}
|
|
|
|
static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->imask &= ~mask;
|
|
writel(host->imask, host->base + MMC_I_MASK);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->imask |= mask;
|
|
writel(host->imask, host->base + MMC_I_MASK);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
static void pxamci_dma_irq(void *param);
|
|
|
|
static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
|
|
{
|
|
struct dma_async_tx_descriptor *tx;
|
|
enum dma_transfer_direction direction;
|
|
struct dma_slave_config config;
|
|
struct dma_chan *chan;
|
|
unsigned int nob = data->blocks;
|
|
unsigned long long clks;
|
|
unsigned int timeout;
|
|
int ret;
|
|
|
|
host->data = data;
|
|
|
|
writel(nob, host->base + MMC_NOB);
|
|
writel(data->blksz, host->base + MMC_BLKLEN);
|
|
|
|
clks = (unsigned long long)data->timeout_ns * host->clkrate;
|
|
do_div(clks, 1000000000UL);
|
|
timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
|
|
writel((timeout + 255) / 256, host->base + MMC_RDTO);
|
|
|
|
memset(&config, 0, sizeof(config));
|
|
config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
|
|
config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
|
|
config.src_addr = host->res->start + MMC_RXFIFO;
|
|
config.dst_addr = host->res->start + MMC_TXFIFO;
|
|
config.src_maxburst = 32;
|
|
config.dst_maxburst = 32;
|
|
|
|
if (data->flags & MMC_DATA_READ) {
|
|
host->dma_dir = DMA_FROM_DEVICE;
|
|
direction = DMA_DEV_TO_MEM;
|
|
chan = host->dma_chan_rx;
|
|
} else {
|
|
host->dma_dir = DMA_TO_DEVICE;
|
|
direction = DMA_MEM_TO_DEV;
|
|
chan = host->dma_chan_tx;
|
|
}
|
|
|
|
config.direction = direction;
|
|
|
|
ret = dmaengine_slave_config(chan, &config);
|
|
if (ret < 0) {
|
|
dev_err(mmc_dev(host->mmc), "dma slave config failed\n");
|
|
return;
|
|
}
|
|
|
|
host->dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
|
|
host->dma_dir);
|
|
|
|
tx = dmaengine_prep_slave_sg(chan, data->sg, host->dma_len, direction,
|
|
DMA_PREP_INTERRUPT);
|
|
if (!tx) {
|
|
dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
|
|
return;
|
|
}
|
|
|
|
if (!(data->flags & MMC_DATA_READ)) {
|
|
tx->callback = pxamci_dma_irq;
|
|
tx->callback_param = host;
|
|
}
|
|
|
|
host->dma_cookie = dmaengine_submit(tx);
|
|
|
|
/*
|
|
* workaround for erratum #91:
|
|
* only start DMA now if we are doing a read,
|
|
* otherwise we wait until CMD/RESP has finished
|
|
* before starting DMA.
|
|
*/
|
|
if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ)
|
|
dma_async_issue_pending(chan);
|
|
}
|
|
|
|
static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
|
|
{
|
|
WARN_ON(host->cmd != NULL);
|
|
host->cmd = cmd;
|
|
|
|
if (cmd->flags & MMC_RSP_BUSY)
|
|
cmdat |= CMDAT_BUSY;
|
|
|
|
#define RSP_TYPE(x) ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
|
|
switch (RSP_TYPE(mmc_resp_type(cmd))) {
|
|
case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */
|
|
cmdat |= CMDAT_RESP_SHORT;
|
|
break;
|
|
case RSP_TYPE(MMC_RSP_R3):
|
|
cmdat |= CMDAT_RESP_R3;
|
|
break;
|
|
case RSP_TYPE(MMC_RSP_R2):
|
|
cmdat |= CMDAT_RESP_R2;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
writel(cmd->opcode, host->base + MMC_CMD);
|
|
writel(cmd->arg >> 16, host->base + MMC_ARGH);
|
|
writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
|
|
writel(cmdat, host->base + MMC_CMDAT);
|
|
writel(host->clkrt, host->base + MMC_CLKRT);
|
|
|
|
writel(START_CLOCK, host->base + MMC_STRPCL);
|
|
|
|
pxamci_enable_irq(host, END_CMD_RES);
|
|
}
|
|
|
|
static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
|
|
{
|
|
host->mrq = NULL;
|
|
host->cmd = NULL;
|
|
host->data = NULL;
|
|
mmc_request_done(host->mmc, mrq);
|
|
}
|
|
|
|
static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
|
|
{
|
|
struct mmc_command *cmd = host->cmd;
|
|
int i;
|
|
u32 v;
|
|
|
|
if (!cmd)
|
|
return 0;
|
|
|
|
host->cmd = NULL;
|
|
|
|
/*
|
|
* Did I mention this is Sick. We always need to
|
|
* discard the upper 8 bits of the first 16-bit word.
|
|
*/
|
|
v = readl(host->base + MMC_RES) & 0xffff;
|
|
for (i = 0; i < 4; i++) {
|
|
u32 w1 = readl(host->base + MMC_RES) & 0xffff;
|
|
u32 w2 = readl(host->base + MMC_RES) & 0xffff;
|
|
cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
|
|
v = w2;
|
|
}
|
|
|
|
if (stat & STAT_TIME_OUT_RESPONSE) {
|
|
cmd->error = -ETIMEDOUT;
|
|
} else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
|
|
/*
|
|
* workaround for erratum #42:
|
|
* Intel PXA27x Family Processor Specification Update Rev 001
|
|
* A bogus CRC error can appear if the msb of a 136 bit
|
|
* response is a one.
|
|
*/
|
|
if (cpu_is_pxa27x() &&
|
|
(cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000))
|
|
pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
|
|
else
|
|
cmd->error = -EILSEQ;
|
|
}
|
|
|
|
pxamci_disable_irq(host, END_CMD_RES);
|
|
if (host->data && !cmd->error) {
|
|
pxamci_enable_irq(host, DATA_TRAN_DONE);
|
|
/*
|
|
* workaround for erratum #91, if doing write
|
|
* enable DMA late
|
|
*/
|
|
if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE)
|
|
dma_async_issue_pending(host->dma_chan_tx);
|
|
} else {
|
|
pxamci_finish_request(host, host->mrq);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
|
|
{
|
|
struct mmc_data *data = host->data;
|
|
struct dma_chan *chan;
|
|
|
|
if (!data)
|
|
return 0;
|
|
|
|
if (data->flags & MMC_DATA_READ)
|
|
chan = host->dma_chan_rx;
|
|
else
|
|
chan = host->dma_chan_tx;
|
|
dma_unmap_sg(chan->device->dev,
|
|
data->sg, data->sg_len, host->dma_dir);
|
|
|
|
if (stat & STAT_READ_TIME_OUT)
|
|
data->error = -ETIMEDOUT;
|
|
else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
|
|
data->error = -EILSEQ;
|
|
|
|
/*
|
|
* There appears to be a hardware design bug here. There seems to
|
|
* be no way to find out how much data was transferred to the card.
|
|
* This means that if there was an error on any block, we mark all
|
|
* data blocks as being in error.
|
|
*/
|
|
if (!data->error)
|
|
data->bytes_xfered = data->blocks * data->blksz;
|
|
else
|
|
data->bytes_xfered = 0;
|
|
|
|
pxamci_disable_irq(host, DATA_TRAN_DONE);
|
|
|
|
host->data = NULL;
|
|
if (host->mrq->stop) {
|
|
pxamci_stop_clock(host);
|
|
pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
|
|
} else {
|
|
pxamci_finish_request(host, host->mrq);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static irqreturn_t pxamci_irq(int irq, void *devid)
|
|
{
|
|
struct pxamci_host *host = devid;
|
|
unsigned int ireg;
|
|
int handled = 0;
|
|
|
|
ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);
|
|
|
|
if (ireg) {
|
|
unsigned stat = readl(host->base + MMC_STAT);
|
|
|
|
pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat);
|
|
|
|
if (ireg & END_CMD_RES)
|
|
handled |= pxamci_cmd_done(host, stat);
|
|
if (ireg & DATA_TRAN_DONE)
|
|
handled |= pxamci_data_done(host, stat);
|
|
if (ireg & SDIO_INT) {
|
|
mmc_signal_sdio_irq(host->mmc);
|
|
handled = 1;
|
|
}
|
|
}
|
|
|
|
return IRQ_RETVAL(handled);
|
|
}
|
|
|
|
static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
{
|
|
struct pxamci_host *host = mmc_priv(mmc);
|
|
unsigned int cmdat;
|
|
|
|
WARN_ON(host->mrq != NULL);
|
|
|
|
host->mrq = mrq;
|
|
|
|
pxamci_stop_clock(host);
|
|
|
|
cmdat = host->cmdat;
|
|
host->cmdat &= ~CMDAT_INIT;
|
|
|
|
if (mrq->data) {
|
|
pxamci_setup_data(host, mrq->data);
|
|
|
|
cmdat &= ~CMDAT_BUSY;
|
|
cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
|
|
if (mrq->data->flags & MMC_DATA_WRITE)
|
|
cmdat |= CMDAT_WRITE;
|
|
}
|
|
|
|
pxamci_start_cmd(host, mrq->cmd, cmdat);
|
|
}
|
|
|
|
static int pxamci_get_ro(struct mmc_host *mmc)
|
|
{
|
|
struct pxamci_host *host = mmc_priv(mmc);
|
|
|
|
if (host->use_ro_gpio)
|
|
return mmc_gpio_get_ro(mmc);
|
|
if (host->pdata && host->pdata->get_ro)
|
|
return !!host->pdata->get_ro(mmc_dev(mmc));
|
|
/*
|
|
* Board doesn't support read only detection; let the mmc core
|
|
* decide what to do.
|
|
*/
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct pxamci_host *host = mmc_priv(mmc);
|
|
|
|
if (ios->clock) {
|
|
unsigned long rate = host->clkrate;
|
|
unsigned int clk = rate / ios->clock;
|
|
|
|
if (host->clkrt == CLKRT_OFF)
|
|
clk_prepare_enable(host->clk);
|
|
|
|
if (ios->clock == 26000000) {
|
|
/* to support 26MHz */
|
|
host->clkrt = 7;
|
|
} else {
|
|
/* to handle (19.5MHz, 26MHz) */
|
|
if (!clk)
|
|
clk = 1;
|
|
|
|
/*
|
|
* clk might result in a lower divisor than we
|
|
* desire. check for that condition and adjust
|
|
* as appropriate.
|
|
*/
|
|
if (rate / clk > ios->clock)
|
|
clk <<= 1;
|
|
host->clkrt = fls(clk) - 1;
|
|
}
|
|
|
|
/*
|
|
* we write clkrt on the next command
|
|
*/
|
|
} else {
|
|
pxamci_stop_clock(host);
|
|
if (host->clkrt != CLKRT_OFF) {
|
|
host->clkrt = CLKRT_OFF;
|
|
clk_disable_unprepare(host->clk);
|
|
}
|
|
}
|
|
|
|
if (host->power_mode != ios->power_mode) {
|
|
int ret;
|
|
|
|
host->power_mode = ios->power_mode;
|
|
|
|
ret = pxamci_set_power(host, ios->power_mode, ios->vdd);
|
|
if (ret) {
|
|
dev_err(mmc_dev(mmc), "unable to set power\n");
|
|
/*
|
|
* The .set_ios() function in the mmc_host_ops
|
|
* struct return void, and failing to set the
|
|
* power should be rare so we print an error and
|
|
* return here.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
if (ios->power_mode == MMC_POWER_ON)
|
|
host->cmdat |= CMDAT_INIT;
|
|
}
|
|
|
|
if (ios->bus_width == MMC_BUS_WIDTH_4)
|
|
host->cmdat |= CMDAT_SD_4DAT;
|
|
else
|
|
host->cmdat &= ~CMDAT_SD_4DAT;
|
|
|
|
dev_dbg(mmc_dev(mmc), "PXAMCI: clkrt = %x cmdat = %x\n",
|
|
host->clkrt, host->cmdat);
|
|
}
|
|
|
|
static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
|
|
{
|
|
struct pxamci_host *pxa_host = mmc_priv(host);
|
|
|
|
if (enable)
|
|
pxamci_enable_irq(pxa_host, SDIO_INT);
|
|
else
|
|
pxamci_disable_irq(pxa_host, SDIO_INT);
|
|
}
|
|
|
|
static const struct mmc_host_ops pxamci_ops = {
|
|
.request = pxamci_request,
|
|
.get_cd = mmc_gpio_get_cd,
|
|
.get_ro = pxamci_get_ro,
|
|
.set_ios = pxamci_set_ios,
|
|
.enable_sdio_irq = pxamci_enable_sdio_irq,
|
|
};
|
|
|
|
static void pxamci_dma_irq(void *param)
|
|
{
|
|
struct pxamci_host *host = param;
|
|
struct dma_tx_state state;
|
|
enum dma_status status;
|
|
struct dma_chan *chan;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
if (!host->data)
|
|
goto out_unlock;
|
|
|
|
if (host->data->flags & MMC_DATA_READ)
|
|
chan = host->dma_chan_rx;
|
|
else
|
|
chan = host->dma_chan_tx;
|
|
|
|
status = dmaengine_tx_status(chan, host->dma_cookie, &state);
|
|
|
|
if (likely(status == DMA_COMPLETE)) {
|
|
writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
|
|
} else {
|
|
pr_err("%s: DMA error on %s channel\n", mmc_hostname(host->mmc),
|
|
host->data->flags & MMC_DATA_READ ? "rx" : "tx");
|
|
host->data->error = -EIO;
|
|
pxamci_data_done(host, 0);
|
|
}
|
|
|
|
out_unlock:
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
static irqreturn_t pxamci_detect_irq(int irq, void *devid)
|
|
{
|
|
struct pxamci_host *host = mmc_priv(devid);
|
|
|
|
mmc_detect_change(devid, msecs_to_jiffies(host->detect_delay_ms));
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id pxa_mmc_dt_ids[] = {
|
|
{ .compatible = "marvell,pxa-mmc" },
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, pxa_mmc_dt_ids);
|
|
|
|
static int pxamci_of_init(struct platform_device *pdev,
|
|
struct mmc_host *mmc)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct pxamci_host *host = mmc_priv(mmc);
|
|
u32 tmp;
|
|
int ret;
|
|
|
|
if (!np)
|
|
return 0;
|
|
|
|
/* pxa-mmc specific */
|
|
if (of_property_read_u32(np, "pxa-mmc,detect-delay-ms", &tmp) == 0)
|
|
host->detect_delay_ms = tmp;
|
|
|
|
ret = mmc_of_parse(mmc);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static int pxamci_of_init(struct platform_device *pdev,
|
|
struct mmc_host *mmc)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int pxamci_probe(struct platform_device *pdev)
|
|
{
|
|
struct mmc_host *mmc;
|
|
struct pxamci_host *host = NULL;
|
|
struct device *dev = &pdev->dev;
|
|
struct resource *r;
|
|
int ret, irq;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
mmc = mmc_alloc_host(sizeof(struct pxamci_host), dev);
|
|
if (!mmc) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
mmc->ops = &pxamci_ops;
|
|
|
|
/*
|
|
* We can do SG-DMA, but we don't because we never know how much
|
|
* data we successfully wrote to the card.
|
|
*/
|
|
mmc->max_segs = NR_SG;
|
|
|
|
/*
|
|
* Our hardware DMA can handle a maximum of one page per SG entry.
|
|
*/
|
|
mmc->max_seg_size = PAGE_SIZE;
|
|
|
|
/*
|
|
* Block length register is only 10 bits before PXA27x.
|
|
*/
|
|
mmc->max_blk_size = cpu_is_pxa25x() ? 1023 : 2048;
|
|
|
|
/*
|
|
* Block count register is 16 bits.
|
|
*/
|
|
mmc->max_blk_count = 65535;
|
|
|
|
ret = pxamci_of_init(pdev, mmc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
host = mmc_priv(mmc);
|
|
host->mmc = mmc;
|
|
host->pdata = pdev->dev.platform_data;
|
|
host->clkrt = CLKRT_OFF;
|
|
|
|
host->clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(host->clk)) {
|
|
ret = PTR_ERR(host->clk);
|
|
host->clk = NULL;
|
|
goto out;
|
|
}
|
|
|
|
host->clkrate = clk_get_rate(host->clk);
|
|
|
|
/*
|
|
* Calculate minimum clock rate, rounding up.
|
|
*/
|
|
mmc->f_min = (host->clkrate + 63) / 64;
|
|
mmc->f_max = (mmc_has_26MHz()) ? 26000000 : host->clkrate;
|
|
|
|
ret = pxamci_init_ocr(host);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
mmc->caps = 0;
|
|
host->cmdat = 0;
|
|
if (!cpu_is_pxa25x()) {
|
|
mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
|
|
host->cmdat |= CMDAT_SDIO_INT_EN;
|
|
if (mmc_has_26MHz())
|
|
mmc->caps |= MMC_CAP_MMC_HIGHSPEED |
|
|
MMC_CAP_SD_HIGHSPEED;
|
|
}
|
|
|
|
spin_lock_init(&host->lock);
|
|
host->res = r;
|
|
host->imask = MMC_I_MASK_ALL;
|
|
|
|
host->base = devm_ioremap_resource(dev, r);
|
|
if (IS_ERR(host->base)) {
|
|
ret = PTR_ERR(host->base);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Ensure that the host controller is shut down, and setup
|
|
* with our defaults.
|
|
*/
|
|
pxamci_stop_clock(host);
|
|
writel(0, host->base + MMC_SPI);
|
|
writel(64, host->base + MMC_RESTO);
|
|
writel(host->imask, host->base + MMC_I_MASK);
|
|
|
|
ret = devm_request_irq(dev, irq, pxamci_irq, 0,
|
|
DRIVER_NAME, host);
|
|
if (ret)
|
|
goto out;
|
|
|
|
platform_set_drvdata(pdev, mmc);
|
|
|
|
host->dma_chan_rx = dma_request_slave_channel(dev, "rx");
|
|
if (host->dma_chan_rx == NULL) {
|
|
dev_err(dev, "unable to request rx dma channel\n");
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
host->dma_chan_tx = dma_request_slave_channel(dev, "tx");
|
|
if (host->dma_chan_tx == NULL) {
|
|
dev_err(dev, "unable to request tx dma channel\n");
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
if (host->pdata) {
|
|
host->detect_delay_ms = host->pdata->detect_delay_ms;
|
|
|
|
host->power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
|
|
if (IS_ERR(host->power)) {
|
|
dev_err(dev, "Failed requesting gpio_power\n");
|
|
goto out;
|
|
}
|
|
|
|
/* FIXME: should we pass detection delay to debounce? */
|
|
ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
|
|
if (ret && ret != -ENOENT) {
|
|
dev_err(dev, "Failed requesting gpio_cd\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0, NULL);
|
|
if (ret && ret != -ENOENT) {
|
|
dev_err(dev, "Failed requesting gpio_ro\n");
|
|
goto out;
|
|
}
|
|
if (!ret) {
|
|
host->use_ro_gpio = true;
|
|
mmc->caps2 |= host->pdata->gpio_card_ro_invert ?
|
|
0 : MMC_CAP2_RO_ACTIVE_HIGH;
|
|
}
|
|
|
|
if (host->pdata->init)
|
|
host->pdata->init(dev, pxamci_detect_irq, mmc);
|
|
|
|
if (host->power && host->pdata->setpower)
|
|
dev_warn(dev, "gpio_power and setpower() both defined\n");
|
|
if (host->use_ro_gpio && host->pdata->get_ro)
|
|
dev_warn(dev, "gpio_ro and get_ro() both defined\n");
|
|
}
|
|
|
|
mmc_add_host(mmc);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
if (host) {
|
|
if (host->dma_chan_rx)
|
|
dma_release_channel(host->dma_chan_rx);
|
|
if (host->dma_chan_tx)
|
|
dma_release_channel(host->dma_chan_tx);
|
|
}
|
|
if (mmc)
|
|
mmc_free_host(mmc);
|
|
return ret;
|
|
}
|
|
|
|
static int pxamci_remove(struct platform_device *pdev)
|
|
{
|
|
struct mmc_host *mmc = platform_get_drvdata(pdev);
|
|
|
|
if (mmc) {
|
|
struct pxamci_host *host = mmc_priv(mmc);
|
|
|
|
mmc_remove_host(mmc);
|
|
|
|
if (host->pdata && host->pdata->exit)
|
|
host->pdata->exit(&pdev->dev, mmc);
|
|
|
|
pxamci_stop_clock(host);
|
|
writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
|
|
END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
|
|
host->base + MMC_I_MASK);
|
|
|
|
dmaengine_terminate_all(host->dma_chan_rx);
|
|
dmaengine_terminate_all(host->dma_chan_tx);
|
|
dma_release_channel(host->dma_chan_rx);
|
|
dma_release_channel(host->dma_chan_tx);
|
|
|
|
mmc_free_host(mmc);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver pxamci_driver = {
|
|
.probe = pxamci_probe,
|
|
.remove = pxamci_remove,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.of_match_table = of_match_ptr(pxa_mmc_dt_ids),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(pxamci_driver);
|
|
|
|
MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:pxa2xx-mci");
|