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linux/drivers/mmc/host/davinci_mmc.c
Thomas Gleixner 74ba9207e1 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 
Based on 1 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 as published by
  the free software foundation either version 2 of the license or at
  your option any later version 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 write to the free software foundation inc
  675 mass ave cambridge ma 02139 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 441 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:36:45 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* davinci_mmc.c - TI DaVinci MMC/SD/SDIO driver
*
* Copyright (C) 2006 Texas Instruments.
* Original author: Purushotam Kumar
* Copyright (C) 2009 David Brownell
*/
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/cpufreq.h>
#include <linux/mmc/host.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/mmc/mmc.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/interrupt.h>
#include <linux/platform_data/mmc-davinci.h>
/*
* Register Definitions
*/
#define DAVINCI_MMCCTL 0x00 /* Control Register */
#define DAVINCI_MMCCLK 0x04 /* Memory Clock Control Register */
#define DAVINCI_MMCST0 0x08 /* Status Register 0 */
#define DAVINCI_MMCST1 0x0C /* Status Register 1 */
#define DAVINCI_MMCIM 0x10 /* Interrupt Mask Register */
#define DAVINCI_MMCTOR 0x14 /* Response Time-Out Register */
#define DAVINCI_MMCTOD 0x18 /* Data Read Time-Out Register */
#define DAVINCI_MMCBLEN 0x1C /* Block Length Register */
#define DAVINCI_MMCNBLK 0x20 /* Number of Blocks Register */
#define DAVINCI_MMCNBLC 0x24 /* Number of Blocks Counter Register */
#define DAVINCI_MMCDRR 0x28 /* Data Receive Register */
#define DAVINCI_MMCDXR 0x2C /* Data Transmit Register */
#define DAVINCI_MMCCMD 0x30 /* Command Register */
#define DAVINCI_MMCARGHL 0x34 /* Argument Register */
#define DAVINCI_MMCRSP01 0x38 /* Response Register 0 and 1 */
#define DAVINCI_MMCRSP23 0x3C /* Response Register 0 and 1 */
#define DAVINCI_MMCRSP45 0x40 /* Response Register 0 and 1 */
#define DAVINCI_MMCRSP67 0x44 /* Response Register 0 and 1 */
#define DAVINCI_MMCDRSP 0x48 /* Data Response Register */
#define DAVINCI_MMCETOK 0x4C
#define DAVINCI_MMCCIDX 0x50 /* Command Index Register */
#define DAVINCI_MMCCKC 0x54
#define DAVINCI_MMCTORC 0x58
#define DAVINCI_MMCTODC 0x5C
#define DAVINCI_MMCBLNC 0x60
#define DAVINCI_SDIOCTL 0x64
#define DAVINCI_SDIOST0 0x68
#define DAVINCI_SDIOIEN 0x6C
#define DAVINCI_SDIOIST 0x70
#define DAVINCI_MMCFIFOCTL 0x74 /* FIFO Control Register */
/* DAVINCI_MMCCTL definitions */
#define MMCCTL_DATRST (1 << 0)
#define MMCCTL_CMDRST (1 << 1)
#define MMCCTL_WIDTH_8_BIT (1 << 8)
#define MMCCTL_WIDTH_4_BIT (1 << 2)
#define MMCCTL_DATEG_DISABLED (0 << 6)
#define MMCCTL_DATEG_RISING (1 << 6)
#define MMCCTL_DATEG_FALLING (2 << 6)
#define MMCCTL_DATEG_BOTH (3 << 6)
#define MMCCTL_PERMDR_LE (0 << 9)
#define MMCCTL_PERMDR_BE (1 << 9)
#define MMCCTL_PERMDX_LE (0 << 10)
#define MMCCTL_PERMDX_BE (1 << 10)
/* DAVINCI_MMCCLK definitions */
#define MMCCLK_CLKEN (1 << 8)
#define MMCCLK_CLKRT_MASK (0xFF << 0)
/* IRQ bit definitions, for DAVINCI_MMCST0 and DAVINCI_MMCIM */
#define MMCST0_DATDNE BIT(0) /* data done */
#define MMCST0_BSYDNE BIT(1) /* busy done */
#define MMCST0_RSPDNE BIT(2) /* command done */
#define MMCST0_TOUTRD BIT(3) /* data read timeout */
#define MMCST0_TOUTRS BIT(4) /* command response timeout */
#define MMCST0_CRCWR BIT(5) /* data write CRC error */
#define MMCST0_CRCRD BIT(6) /* data read CRC error */
#define MMCST0_CRCRS BIT(7) /* command response CRC error */
#define MMCST0_DXRDY BIT(9) /* data transmit ready (fifo empty) */
#define MMCST0_DRRDY BIT(10) /* data receive ready (data in fifo)*/
#define MMCST0_DATED BIT(11) /* DAT3 edge detect */
#define MMCST0_TRNDNE BIT(12) /* transfer done */
/* DAVINCI_MMCST1 definitions */
#define MMCST1_BUSY (1 << 0)
/* DAVINCI_MMCCMD definitions */
#define MMCCMD_CMD_MASK (0x3F << 0)
#define MMCCMD_PPLEN (1 << 7)
#define MMCCMD_BSYEXP (1 << 8)
#define MMCCMD_RSPFMT_MASK (3 << 9)
#define MMCCMD_RSPFMT_NONE (0 << 9)
#define MMCCMD_RSPFMT_R1456 (1 << 9)
#define MMCCMD_RSPFMT_R2 (2 << 9)
#define MMCCMD_RSPFMT_R3 (3 << 9)
#define MMCCMD_DTRW (1 << 11)
#define MMCCMD_STRMTP (1 << 12)
#define MMCCMD_WDATX (1 << 13)
#define MMCCMD_INITCK (1 << 14)
#define MMCCMD_DCLR (1 << 15)
#define MMCCMD_DMATRIG (1 << 16)
/* DAVINCI_MMCFIFOCTL definitions */
#define MMCFIFOCTL_FIFORST (1 << 0)
#define MMCFIFOCTL_FIFODIR_WR (1 << 1)
#define MMCFIFOCTL_FIFODIR_RD (0 << 1)
#define MMCFIFOCTL_FIFOLEV (1 << 2) /* 0 = 128 bits, 1 = 256 bits */
#define MMCFIFOCTL_ACCWD_4 (0 << 3) /* access width of 4 bytes */
#define MMCFIFOCTL_ACCWD_3 (1 << 3) /* access width of 3 bytes */
#define MMCFIFOCTL_ACCWD_2 (2 << 3) /* access width of 2 bytes */
#define MMCFIFOCTL_ACCWD_1 (3 << 3) /* access width of 1 byte */
/* DAVINCI_SDIOST0 definitions */
#define SDIOST0_DAT1_HI BIT(0)
/* DAVINCI_SDIOIEN definitions */
#define SDIOIEN_IOINTEN BIT(0)
/* DAVINCI_SDIOIST definitions */
#define SDIOIST_IOINT BIT(0)
/* MMCSD Init clock in Hz in opendrain mode */
#define MMCSD_INIT_CLOCK 200000
/*
* One scatterlist dma "segment" is at most MAX_CCNT rw_threshold units,
* and we handle up to MAX_NR_SG segments. MMC_BLOCK_BOUNCE kicks in only
* for drivers with max_segs == 1, making the segments bigger (64KB)
* than the page or two that's otherwise typical. nr_sg (passed from
* platform data) == 16 gives at least the same throughput boost, using
* EDMA transfer linkage instead of spending CPU time copying pages.
*/
#define MAX_CCNT ((1 << 16) - 1)
#define MAX_NR_SG 16
static unsigned rw_threshold = 32;
module_param(rw_threshold, uint, S_IRUGO);
MODULE_PARM_DESC(rw_threshold,
"Read/Write threshold. Default = 32");
static unsigned poll_threshold = 128;
module_param(poll_threshold, uint, S_IRUGO);
MODULE_PARM_DESC(poll_threshold,
"Polling transaction size threshold. Default = 128");
static unsigned poll_loopcount = 32;
module_param(poll_loopcount, uint, S_IRUGO);
MODULE_PARM_DESC(poll_loopcount,
"Maximum polling loop count. Default = 32");
static unsigned use_dma = 1;
module_param(use_dma, uint, 0);
MODULE_PARM_DESC(use_dma, "Whether to use DMA or not. Default = 1");
struct mmc_davinci_host {
struct mmc_command *cmd;
struct mmc_data *data;
struct mmc_host *mmc;
struct clk *clk;
unsigned int mmc_input_clk;
void __iomem *base;
struct resource *mem_res;
int mmc_irq, sdio_irq;
unsigned char bus_mode;
#define DAVINCI_MMC_DATADIR_NONE 0
#define DAVINCI_MMC_DATADIR_READ 1
#define DAVINCI_MMC_DATADIR_WRITE 2
unsigned char data_dir;
/* buffer is used during PIO of one scatterlist segment, and
* is updated along with buffer_bytes_left. bytes_left applies
* to all N blocks of the PIO transfer.
*/
u8 *buffer;
u32 buffer_bytes_left;
u32 bytes_left;
struct dma_chan *dma_tx;
struct dma_chan *dma_rx;
bool use_dma;
bool do_dma;
bool sdio_int;
bool active_request;
/* For PIO we walk scatterlists one segment at a time. */
unsigned int sg_len;
struct scatterlist *sg;
/* Version of the MMC/SD controller */
u8 version;
/* for ns in one cycle calculation */
unsigned ns_in_one_cycle;
/* Number of sg segments */
u8 nr_sg;
#ifdef CONFIG_CPU_FREQ
struct notifier_block freq_transition;
#endif
};
static irqreturn_t mmc_davinci_irq(int irq, void *dev_id);
/* PIO only */
static void mmc_davinci_sg_to_buf(struct mmc_davinci_host *host)
{
host->buffer_bytes_left = sg_dma_len(host->sg);
host->buffer = sg_virt(host->sg);
if (host->buffer_bytes_left > host->bytes_left)
host->buffer_bytes_left = host->bytes_left;
}
static void davinci_fifo_data_trans(struct mmc_davinci_host *host,
unsigned int n)
{
u8 *p;
unsigned int i;
if (host->buffer_bytes_left == 0) {
host->sg = sg_next(host->data->sg);
mmc_davinci_sg_to_buf(host);
}
p = host->buffer;
if (n > host->buffer_bytes_left)
n = host->buffer_bytes_left;
host->buffer_bytes_left -= n;
host->bytes_left -= n;
/* NOTE: we never transfer more than rw_threshold bytes
* to/from the fifo here; there's no I/O overlap.
* This also assumes that access width( i.e. ACCWD) is 4 bytes
*/
if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
for (i = 0; i < (n >> 2); i++) {
writel(*((u32 *)p), host->base + DAVINCI_MMCDXR);
p = p + 4;
}
if (n & 3) {
iowrite8_rep(host->base + DAVINCI_MMCDXR, p, (n & 3));
p = p + (n & 3);
}
} else {
for (i = 0; i < (n >> 2); i++) {
*((u32 *)p) = readl(host->base + DAVINCI_MMCDRR);
p = p + 4;
}
if (n & 3) {
ioread8_rep(host->base + DAVINCI_MMCDRR, p, (n & 3));
p = p + (n & 3);
}
}
host->buffer = p;
}
static void mmc_davinci_start_command(struct mmc_davinci_host *host,
struct mmc_command *cmd)
{
u32 cmd_reg = 0;
u32 im_val;
dev_dbg(mmc_dev(host->mmc), "CMD%d, arg 0x%08x%s\n",
cmd->opcode, cmd->arg,
({ char *s;
switch (mmc_resp_type(cmd)) {
case MMC_RSP_R1:
s = ", R1/R5/R6/R7 response";
break;
case MMC_RSP_R1B:
s = ", R1b response";
break;
case MMC_RSP_R2:
s = ", R2 response";
break;
case MMC_RSP_R3:
s = ", R3/R4 response";
break;
default:
s = ", (R? response)";
break;
}; s; }));
host->cmd = cmd;
switch (mmc_resp_type(cmd)) {
case MMC_RSP_R1B:
/* There's some spec confusion about when R1B is
* allowed, but if the card doesn't issue a BUSY
* then it's harmless for us to allow it.
*/
cmd_reg |= MMCCMD_BSYEXP;
/* FALLTHROUGH */
case MMC_RSP_R1: /* 48 bits, CRC */
cmd_reg |= MMCCMD_RSPFMT_R1456;
break;
case MMC_RSP_R2: /* 136 bits, CRC */
cmd_reg |= MMCCMD_RSPFMT_R2;
break;
case MMC_RSP_R3: /* 48 bits, no CRC */
cmd_reg |= MMCCMD_RSPFMT_R3;
break;
default:
cmd_reg |= MMCCMD_RSPFMT_NONE;
dev_dbg(mmc_dev(host->mmc), "unknown resp_type %04x\n",
mmc_resp_type(cmd));
break;
}
/* Set command index */
cmd_reg |= cmd->opcode;
/* Enable EDMA transfer triggers */
if (host->do_dma)
cmd_reg |= MMCCMD_DMATRIG;
if (host->version == MMC_CTLR_VERSION_2 && host->data != NULL &&
host->data_dir == DAVINCI_MMC_DATADIR_READ)
cmd_reg |= MMCCMD_DMATRIG;
/* Setting whether command involves data transfer or not */
if (cmd->data)
cmd_reg |= MMCCMD_WDATX;
/* Setting whether data read or write */
if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)
cmd_reg |= MMCCMD_DTRW;
if (host->bus_mode == MMC_BUSMODE_PUSHPULL)
cmd_reg |= MMCCMD_PPLEN;
/* set Command timeout */
writel(0x1FFF, host->base + DAVINCI_MMCTOR);
/* Enable interrupt (calculate here, defer until FIFO is stuffed). */
im_val = MMCST0_RSPDNE | MMCST0_CRCRS | MMCST0_TOUTRS;
if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
im_val |= MMCST0_DATDNE | MMCST0_CRCWR;
if (!host->do_dma)
im_val |= MMCST0_DXRDY;
} else if (host->data_dir == DAVINCI_MMC_DATADIR_READ) {
im_val |= MMCST0_DATDNE | MMCST0_CRCRD | MMCST0_TOUTRD;
if (!host->do_dma)
im_val |= MMCST0_DRRDY;
}
/*
* Before non-DMA WRITE commands the controller needs priming:
* FIFO should be populated with 32 bytes i.e. whatever is the FIFO size
*/
if (!host->do_dma && (host->data_dir == DAVINCI_MMC_DATADIR_WRITE))
davinci_fifo_data_trans(host, rw_threshold);
writel(cmd->arg, host->base + DAVINCI_MMCARGHL);
writel(cmd_reg, host->base + DAVINCI_MMCCMD);
host->active_request = true;
if (!host->do_dma && host->bytes_left <= poll_threshold) {
u32 count = poll_loopcount;
while (host->active_request && count--) {
mmc_davinci_irq(0, host);
cpu_relax();
}
}
if (host->active_request)
writel(im_val, host->base + DAVINCI_MMCIM);
}
/*----------------------------------------------------------------------*/
/* DMA infrastructure */
static void davinci_abort_dma(struct mmc_davinci_host *host)
{
struct dma_chan *sync_dev;
if (host->data_dir == DAVINCI_MMC_DATADIR_READ)
sync_dev = host->dma_rx;
else
sync_dev = host->dma_tx;
dmaengine_terminate_all(sync_dev);
}
static int mmc_davinci_send_dma_request(struct mmc_davinci_host *host,
struct mmc_data *data)
{
struct dma_chan *chan;
struct dma_async_tx_descriptor *desc;
int ret = 0;
if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
struct dma_slave_config dma_tx_conf = {
.direction = DMA_MEM_TO_DEV,
.dst_addr = host->mem_res->start + DAVINCI_MMCDXR,
.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.dst_maxburst =
rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
};
chan = host->dma_tx;
dmaengine_slave_config(host->dma_tx, &dma_tx_conf);
desc = dmaengine_prep_slave_sg(host->dma_tx,
data->sg,
host->sg_len,
DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dev_dbg(mmc_dev(host->mmc),
"failed to allocate DMA TX descriptor");
ret = -1;
goto out;
}
} else {
struct dma_slave_config dma_rx_conf = {
.direction = DMA_DEV_TO_MEM,
.src_addr = host->mem_res->start + DAVINCI_MMCDRR,
.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.src_maxburst =
rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
};
chan = host->dma_rx;
dmaengine_slave_config(host->dma_rx, &dma_rx_conf);
desc = dmaengine_prep_slave_sg(host->dma_rx,
data->sg,
host->sg_len,
DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dev_dbg(mmc_dev(host->mmc),
"failed to allocate DMA RX descriptor");
ret = -1;
goto out;
}
}
dmaengine_submit(desc);
dma_async_issue_pending(chan);
out:
return ret;
}
static int mmc_davinci_start_dma_transfer(struct mmc_davinci_host *host,
struct mmc_data *data)
{
int i;
int mask = rw_threshold - 1;
int ret = 0;
host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
mmc_get_dma_dir(data));
/* no individual DMA segment should need a partial FIFO */
for (i = 0; i < host->sg_len; i++) {
if (sg_dma_len(data->sg + i) & mask) {
dma_unmap_sg(mmc_dev(host->mmc),
data->sg, data->sg_len,
mmc_get_dma_dir(data));
return -1;
}
}
host->do_dma = 1;
ret = mmc_davinci_send_dma_request(host, data);
return ret;
}
static void davinci_release_dma_channels(struct mmc_davinci_host *host)
{
if (!host->use_dma)
return;
dma_release_channel(host->dma_tx);
dma_release_channel(host->dma_rx);
}
static int davinci_acquire_dma_channels(struct mmc_davinci_host *host)
{
host->dma_tx = dma_request_chan(mmc_dev(host->mmc), "tx");
if (IS_ERR(host->dma_tx)) {
dev_err(mmc_dev(host->mmc), "Can't get dma_tx channel\n");
return PTR_ERR(host->dma_tx);
}
host->dma_rx = dma_request_chan(mmc_dev(host->mmc), "rx");
if (IS_ERR(host->dma_rx)) {
dev_err(mmc_dev(host->mmc), "Can't get dma_rx channel\n");
dma_release_channel(host->dma_tx);
return PTR_ERR(host->dma_rx);
}
return 0;
}
/*----------------------------------------------------------------------*/
static void
mmc_davinci_prepare_data(struct mmc_davinci_host *host, struct mmc_request *req)
{
int fifo_lev = (rw_threshold == 32) ? MMCFIFOCTL_FIFOLEV : 0;
int timeout;
struct mmc_data *data = req->data;
if (host->version == MMC_CTLR_VERSION_2)
fifo_lev = (rw_threshold == 64) ? MMCFIFOCTL_FIFOLEV : 0;
host->data = data;
if (data == NULL) {
host->data_dir = DAVINCI_MMC_DATADIR_NONE;
writel(0, host->base + DAVINCI_MMCBLEN);
writel(0, host->base + DAVINCI_MMCNBLK);
return;
}
dev_dbg(mmc_dev(host->mmc), "%s, %d blocks of %d bytes\n",
(data->flags & MMC_DATA_WRITE) ? "write" : "read",
data->blocks, data->blksz);
dev_dbg(mmc_dev(host->mmc), " DTO %d cycles + %d ns\n",
data->timeout_clks, data->timeout_ns);
timeout = data->timeout_clks +
(data->timeout_ns / host->ns_in_one_cycle);
if (timeout > 0xffff)
timeout = 0xffff;
writel(timeout, host->base + DAVINCI_MMCTOD);
writel(data->blocks, host->base + DAVINCI_MMCNBLK);
writel(data->blksz, host->base + DAVINCI_MMCBLEN);
/* Configure the FIFO */
if (data->flags & MMC_DATA_WRITE) {
host->data_dir = DAVINCI_MMC_DATADIR_WRITE;
writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR | MMCFIFOCTL_FIFORST,
host->base + DAVINCI_MMCFIFOCTL);
writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR,
host->base + DAVINCI_MMCFIFOCTL);
} else {
host->data_dir = DAVINCI_MMC_DATADIR_READ;
writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD | MMCFIFOCTL_FIFORST,
host->base + DAVINCI_MMCFIFOCTL);
writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD,
host->base + DAVINCI_MMCFIFOCTL);
}
host->buffer = NULL;
host->bytes_left = data->blocks * data->blksz;
/* For now we try to use DMA whenever we won't need partial FIFO
* reads or writes, either for the whole transfer (as tested here)
* or for any individual scatterlist segment (tested when we call
* start_dma_transfer).
*
* While we *could* change that, unusual block sizes are rarely
* used. The occasional fallback to PIO should't hurt.
*/
if (host->use_dma && (host->bytes_left & (rw_threshold - 1)) == 0
&& mmc_davinci_start_dma_transfer(host, data) == 0) {
/* zero this to ensure we take no PIO paths */
host->bytes_left = 0;
} else {
/* Revert to CPU Copy */
host->sg_len = data->sg_len;
host->sg = host->data->sg;
mmc_davinci_sg_to_buf(host);
}
}
static void mmc_davinci_request(struct mmc_host *mmc, struct mmc_request *req)
{
struct mmc_davinci_host *host = mmc_priv(mmc);
unsigned long timeout = jiffies + msecs_to_jiffies(900);
u32 mmcst1 = 0;
/* Card may still be sending BUSY after a previous operation,
* typically some kind of write. If so, we can't proceed yet.
*/
while (time_before(jiffies, timeout)) {
mmcst1 = readl(host->base + DAVINCI_MMCST1);
if (!(mmcst1 & MMCST1_BUSY))
break;
cpu_relax();
}
if (mmcst1 & MMCST1_BUSY) {
dev_err(mmc_dev(host->mmc), "still BUSY? bad ... \n");
req->cmd->error = -ETIMEDOUT;
mmc_request_done(mmc, req);
return;
}
host->do_dma = 0;
mmc_davinci_prepare_data(host, req);
mmc_davinci_start_command(host, req->cmd);
}
static unsigned int calculate_freq_for_card(struct mmc_davinci_host *host,
unsigned int mmc_req_freq)
{
unsigned int mmc_freq = 0, mmc_pclk = 0, mmc_push_pull_divisor = 0;
mmc_pclk = host->mmc_input_clk;
if (mmc_req_freq && mmc_pclk > (2 * mmc_req_freq))
mmc_push_pull_divisor = ((unsigned int)mmc_pclk
/ (2 * mmc_req_freq)) - 1;
else
mmc_push_pull_divisor = 0;
mmc_freq = (unsigned int)mmc_pclk
/ (2 * (mmc_push_pull_divisor + 1));
if (mmc_freq > mmc_req_freq)
mmc_push_pull_divisor = mmc_push_pull_divisor + 1;
/* Convert ns to clock cycles */
if (mmc_req_freq <= 400000)
host->ns_in_one_cycle = (1000000) / (((mmc_pclk
/ (2 * (mmc_push_pull_divisor + 1)))/1000));
else
host->ns_in_one_cycle = (1000000) / (((mmc_pclk
/ (2 * (mmc_push_pull_divisor + 1)))/1000000));
return mmc_push_pull_divisor;
}
static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios)
{
unsigned int open_drain_freq = 0, mmc_pclk = 0;
unsigned int mmc_push_pull_freq = 0;
struct mmc_davinci_host *host = mmc_priv(mmc);
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
u32 temp;
/* Ignoring the init clock value passed for fixing the inter
* operability with different cards.
*/
open_drain_freq = ((unsigned int)mmc_pclk
/ (2 * MMCSD_INIT_CLOCK)) - 1;
if (open_drain_freq > 0xFF)
open_drain_freq = 0xFF;
temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
temp |= open_drain_freq;
writel(temp, host->base + DAVINCI_MMCCLK);
/* Convert ns to clock cycles */
host->ns_in_one_cycle = (1000000) / (MMCSD_INIT_CLOCK/1000);
} else {
u32 temp;
mmc_push_pull_freq = calculate_freq_for_card(host, ios->clock);
if (mmc_push_pull_freq > 0xFF)
mmc_push_pull_freq = 0xFF;
temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKEN;
writel(temp, host->base + DAVINCI_MMCCLK);
udelay(10);
temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
temp |= mmc_push_pull_freq;
writel(temp, host->base + DAVINCI_MMCCLK);
writel(temp | MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
udelay(10);
}
}
static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mmc_davinci_host *host = mmc_priv(mmc);
struct platform_device *pdev = to_platform_device(mmc->parent);
struct davinci_mmc_config *config = pdev->dev.platform_data;
dev_dbg(mmc_dev(host->mmc),
"clock %dHz busmode %d powermode %d Vdd %04x\n",
ios->clock, ios->bus_mode, ios->power_mode,
ios->vdd);
switch (ios->power_mode) {
case MMC_POWER_OFF:
if (config && config->set_power)
config->set_power(pdev->id, false);
break;
case MMC_POWER_UP:
if (config && config->set_power)
config->set_power(pdev->id, true);
break;
}
switch (ios->bus_width) {
case MMC_BUS_WIDTH_8:
dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n");
writel((readl(host->base + DAVINCI_MMCCTL) &
~MMCCTL_WIDTH_4_BIT) | MMCCTL_WIDTH_8_BIT,
host->base + DAVINCI_MMCCTL);
break;
case MMC_BUS_WIDTH_4:
dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n");
if (host->version == MMC_CTLR_VERSION_2)
writel((readl(host->base + DAVINCI_MMCCTL) &
~MMCCTL_WIDTH_8_BIT) | MMCCTL_WIDTH_4_BIT,
host->base + DAVINCI_MMCCTL);
else
writel(readl(host->base + DAVINCI_MMCCTL) |
MMCCTL_WIDTH_4_BIT,
host->base + DAVINCI_MMCCTL);
break;
case MMC_BUS_WIDTH_1:
dev_dbg(mmc_dev(host->mmc), "Enabling 1 bit mode\n");
if (host->version == MMC_CTLR_VERSION_2)
writel(readl(host->base + DAVINCI_MMCCTL) &
~(MMCCTL_WIDTH_8_BIT | MMCCTL_WIDTH_4_BIT),
host->base + DAVINCI_MMCCTL);
else
writel(readl(host->base + DAVINCI_MMCCTL) &
~MMCCTL_WIDTH_4_BIT,
host->base + DAVINCI_MMCCTL);
break;
}
calculate_clk_divider(mmc, ios);
host->bus_mode = ios->bus_mode;
if (ios->power_mode == MMC_POWER_UP) {
unsigned long timeout = jiffies + msecs_to_jiffies(50);
bool lose = true;
/* Send clock cycles, poll completion */
writel(0, host->base + DAVINCI_MMCARGHL);
writel(MMCCMD_INITCK, host->base + DAVINCI_MMCCMD);
while (time_before(jiffies, timeout)) {
u32 tmp = readl(host->base + DAVINCI_MMCST0);
if (tmp & MMCST0_RSPDNE) {
lose = false;
break;
}
cpu_relax();
}
if (lose)
dev_warn(mmc_dev(host->mmc), "powerup timeout\n");
}
/* FIXME on power OFF, reset things ... */
}
static void
mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data)
{
host->data = NULL;
if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
/*
* SDIO Interrupt Detection work-around as suggested by
* Davinci Errata (TMS320DM355 Silicon Revision 1.1 Errata
* 2.1.6): Signal SDIO interrupt only if it is enabled by core
*/
if (host->sdio_int && !(readl(host->base + DAVINCI_SDIOST0) &
SDIOST0_DAT1_HI)) {
writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
mmc_signal_sdio_irq(host->mmc);
}
}
if (host->do_dma) {
davinci_abort_dma(host);
dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
mmc_get_dma_dir(data));
host->do_dma = false;
}
host->data_dir = DAVINCI_MMC_DATADIR_NONE;
if (!data->stop || (host->cmd && host->cmd->error)) {
mmc_request_done(host->mmc, data->mrq);
writel(0, host->base + DAVINCI_MMCIM);
host->active_request = false;
} else
mmc_davinci_start_command(host, data->stop);
}
static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
struct mmc_command *cmd)
{
host->cmd = NULL;
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136) {
/* response type 2 */
cmd->resp[3] = readl(host->base + DAVINCI_MMCRSP01);
cmd->resp[2] = readl(host->base + DAVINCI_MMCRSP23);
cmd->resp[1] = readl(host->base + DAVINCI_MMCRSP45);
cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
} else {
/* response types 1, 1b, 3, 4, 5, 6 */
cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
}
}
if (host->data == NULL || cmd->error) {
if (cmd->error == -ETIMEDOUT)
cmd->mrq->cmd->retries = 0;
mmc_request_done(host->mmc, cmd->mrq);
writel(0, host->base + DAVINCI_MMCIM);
host->active_request = false;
}
}
static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
int val)
{
u32 temp;
temp = readl(host->base + DAVINCI_MMCCTL);
if (val) /* reset */
temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
else /* enable */
temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
writel(temp, host->base + DAVINCI_MMCCTL);
udelay(10);
}
static void
davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
{
mmc_davinci_reset_ctrl(host, 1);
mmc_davinci_reset_ctrl(host, 0);
}
static irqreturn_t mmc_davinci_sdio_irq(int irq, void *dev_id)
{
struct mmc_davinci_host *host = dev_id;
unsigned int status;
status = readl(host->base + DAVINCI_SDIOIST);
if (status & SDIOIST_IOINT) {
dev_dbg(mmc_dev(host->mmc),
"SDIO interrupt status %x\n", status);
writel(status | SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
mmc_signal_sdio_irq(host->mmc);
}
return IRQ_HANDLED;
}
static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
{
struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id;
unsigned int status, qstatus;
int end_command = 0;
int end_transfer = 0;
struct mmc_data *data = host->data;
if (host->cmd == NULL && host->data == NULL) {
status = readl(host->base + DAVINCI_MMCST0);
dev_dbg(mmc_dev(host->mmc),
"Spurious interrupt 0x%04x\n", status);
/* Disable the interrupt from mmcsd */
writel(0, host->base + DAVINCI_MMCIM);
return IRQ_NONE;
}
status = readl(host->base + DAVINCI_MMCST0);
qstatus = status;
/* handle FIFO first when using PIO for data.
* bytes_left will decrease to zero as I/O progress and status will
* read zero over iteration because this controller status
* register(MMCST0) reports any status only once and it is cleared
* by read. So, it is not unbouned loop even in the case of
* non-dma.
*/
if (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) {
unsigned long im_val;
/*
* If interrupts fire during the following loop, they will be
* handled by the handler, but the PIC will still buffer these.
* As a result, the handler will be called again to serve these
* needlessly. In order to avoid these spurious interrupts,
* keep interrupts masked during the loop.
*/
im_val = readl(host->base + DAVINCI_MMCIM);
writel(0, host->base + DAVINCI_MMCIM);
do {
davinci_fifo_data_trans(host, rw_threshold);
status = readl(host->base + DAVINCI_MMCST0);
qstatus |= status;
} while (host->bytes_left &&
(status & (MMCST0_DXRDY | MMCST0_DRRDY)));
/*
* If an interrupt is pending, it is assumed it will fire when
* it is unmasked. This assumption is also taken when the MMCIM
* is first set. Otherwise, writing to MMCIM after reading the
* status is race-prone.
*/
writel(im_val, host->base + DAVINCI_MMCIM);
}
if (qstatus & MMCST0_DATDNE) {
/* All blocks sent/received, and CRC checks passed */
if (data != NULL) {
if ((host->do_dma == 0) && (host->bytes_left > 0)) {
/* if datasize < rw_threshold
* no RX ints are generated
*/
davinci_fifo_data_trans(host, host->bytes_left);
}
end_transfer = 1;
data->bytes_xfered = data->blocks * data->blksz;
} else {
dev_err(mmc_dev(host->mmc),
"DATDNE with no host->data\n");
}
}
if (qstatus & MMCST0_TOUTRD) {
/* Read data timeout */
data->error = -ETIMEDOUT;
end_transfer = 1;
dev_dbg(mmc_dev(host->mmc),
"read data timeout, status %x\n",
qstatus);
davinci_abort_data(host, data);
}
if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {
/* Data CRC error */
data->error = -EILSEQ;
end_transfer = 1;
/* NOTE: this controller uses CRCWR to report both CRC
* errors and timeouts (on writes). MMCDRSP values are
* only weakly documented, but 0x9f was clearly a timeout
* case and the two three-bit patterns in various SD specs
* (101, 010) aren't part of it ...
*/
if (qstatus & MMCST0_CRCWR) {
u32 temp = readb(host->base + DAVINCI_MMCDRSP);
if (temp == 0x9f)
data->error = -ETIMEDOUT;
}
dev_dbg(mmc_dev(host->mmc), "data %s %s error\n",
(qstatus & MMCST0_CRCWR) ? "write" : "read",
(data->error == -ETIMEDOUT) ? "timeout" : "CRC");
davinci_abort_data(host, data);
}
if (qstatus & MMCST0_TOUTRS) {
/* Command timeout */
if (host->cmd) {
dev_dbg(mmc_dev(host->mmc),
"CMD%d timeout, status %x\n",
host->cmd->opcode, qstatus);
host->cmd->error = -ETIMEDOUT;
if (data) {
end_transfer = 1;
davinci_abort_data(host, data);
} else
end_command = 1;
}
}
if (qstatus & MMCST0_CRCRS) {
/* Command CRC error */
dev_dbg(mmc_dev(host->mmc), "Command CRC error\n");
if (host->cmd) {
host->cmd->error = -EILSEQ;
end_command = 1;
}
}
if (qstatus & MMCST0_RSPDNE) {
/* End of command phase */
end_command = (int) host->cmd;
}
if (end_command)
mmc_davinci_cmd_done(host, host->cmd);
if (end_transfer)
mmc_davinci_xfer_done(host, data);
return IRQ_HANDLED;
}
static int mmc_davinci_get_cd(struct mmc_host *mmc)
{
struct platform_device *pdev = to_platform_device(mmc->parent);
struct davinci_mmc_config *config = pdev->dev.platform_data;
if (config && config->get_cd)
return config->get_cd(pdev->id);
return mmc_gpio_get_cd(mmc);
}
static int mmc_davinci_get_ro(struct mmc_host *mmc)
{
struct platform_device *pdev = to_platform_device(mmc->parent);
struct davinci_mmc_config *config = pdev->dev.platform_data;
if (config && config->get_ro)
return config->get_ro(pdev->id);
return mmc_gpio_get_ro(mmc);
}
static void mmc_davinci_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct mmc_davinci_host *host = mmc_priv(mmc);
if (enable) {
if (!(readl(host->base + DAVINCI_SDIOST0) & SDIOST0_DAT1_HI)) {
writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
mmc_signal_sdio_irq(host->mmc);
} else {
host->sdio_int = true;
writel(readl(host->base + DAVINCI_SDIOIEN) |
SDIOIEN_IOINTEN, host->base + DAVINCI_SDIOIEN);
}
} else {
host->sdio_int = false;
writel(readl(host->base + DAVINCI_SDIOIEN) & ~SDIOIEN_IOINTEN,
host->base + DAVINCI_SDIOIEN);
}
}
static const struct mmc_host_ops mmc_davinci_ops = {
.request = mmc_davinci_request,
.set_ios = mmc_davinci_set_ios,
.get_cd = mmc_davinci_get_cd,
.get_ro = mmc_davinci_get_ro,
.enable_sdio_irq = mmc_davinci_enable_sdio_irq,
};
/*----------------------------------------------------------------------*/
#ifdef CONFIG_CPU_FREQ
static int mmc_davinci_cpufreq_transition(struct notifier_block *nb,
unsigned long val, void *data)
{
struct mmc_davinci_host *host;
unsigned int mmc_pclk;
struct mmc_host *mmc;
unsigned long flags;
host = container_of(nb, struct mmc_davinci_host, freq_transition);
mmc = host->mmc;
mmc_pclk = clk_get_rate(host->clk);
if (val == CPUFREQ_POSTCHANGE) {
spin_lock_irqsave(&mmc->lock, flags);
host->mmc_input_clk = mmc_pclk;
calculate_clk_divider(mmc, &mmc->ios);
spin_unlock_irqrestore(&mmc->lock, flags);
}
return 0;
}
static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
{
host->freq_transition.notifier_call = mmc_davinci_cpufreq_transition;
return cpufreq_register_notifier(&host->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
}
static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
{
cpufreq_unregister_notifier(&host->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
}
#else
static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
{
return 0;
}
static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
{
}
#endif
static void init_mmcsd_host(struct mmc_davinci_host *host)
{
mmc_davinci_reset_ctrl(host, 1);
writel(0, host->base + DAVINCI_MMCCLK);
writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
writel(0x1FFF, host->base + DAVINCI_MMCTOR);
writel(0xFFFF, host->base + DAVINCI_MMCTOD);
mmc_davinci_reset_ctrl(host, 0);
}
static const struct platform_device_id davinci_mmc_devtype[] = {
{
.name = "dm6441-mmc",
.driver_data = MMC_CTLR_VERSION_1,
}, {
.name = "da830-mmc",
.driver_data = MMC_CTLR_VERSION_2,
},
{},
};
MODULE_DEVICE_TABLE(platform, davinci_mmc_devtype);
static const struct of_device_id davinci_mmc_dt_ids[] = {
{
.compatible = "ti,dm6441-mmc",
.data = &davinci_mmc_devtype[MMC_CTLR_VERSION_1],
},
{
.compatible = "ti,da830-mmc",
.data = &davinci_mmc_devtype[MMC_CTLR_VERSION_2],
},
{},
};
MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
static int mmc_davinci_parse_pdata(struct mmc_host *mmc)
{
struct platform_device *pdev = to_platform_device(mmc->parent);
struct davinci_mmc_config *pdata = pdev->dev.platform_data;
struct mmc_davinci_host *host;
int ret;
if (!pdata)
return -EINVAL;
host = mmc_priv(mmc);
if (!host)
return -EINVAL;
if (pdata && pdata->nr_sg)
host->nr_sg = pdata->nr_sg - 1;
if (pdata && (pdata->wires == 4 || pdata->wires == 0))
mmc->caps |= MMC_CAP_4_BIT_DATA;
if (pdata && (pdata->wires == 8))
mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA);
mmc->f_min = 312500;
mmc->f_max = 25000000;
if (pdata && pdata->max_freq)
mmc->f_max = pdata->max_freq;
if (pdata && pdata->caps)
mmc->caps |= pdata->caps;
/* Register a cd gpio, if there is not one, enable polling */
ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
if (ret == -EPROBE_DEFER)
return ret;
else if (ret)
mmc->caps |= MMC_CAP_NEEDS_POLL;
ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0, NULL);
if (ret == -EPROBE_DEFER)
return ret;
return 0;
}
static int davinci_mmcsd_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
struct mmc_davinci_host *host = NULL;
struct mmc_host *mmc = NULL;
struct resource *r, *mem = NULL;
int ret, irq;
size_t mem_size;
const struct platform_device_id *id_entry;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return -ENODEV;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
mem_size = resource_size(r);
mem = devm_request_mem_region(&pdev->dev, r->start, mem_size,
pdev->name);
if (!mem)
return -EBUSY;
mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev->dev);
if (!mmc)
return -ENOMEM;
host = mmc_priv(mmc);
host->mmc = mmc; /* Important */
host->mem_res = mem;
host->base = devm_ioremap(&pdev->dev, mem->start, mem_size);
if (!host->base) {
ret = -ENOMEM;
goto ioremap_fail;
}
host->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(host->clk)) {
ret = PTR_ERR(host->clk);
goto clk_get_fail;
}
ret = clk_prepare_enable(host->clk);
if (ret)
goto clk_prepare_enable_fail;
host->mmc_input_clk = clk_get_rate(host->clk);
match = of_match_device(davinci_mmc_dt_ids, &pdev->dev);
if (match) {
pdev->id_entry = match->data;
ret = mmc_of_parse(mmc);
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev,
"could not parse of data: %d\n", ret);
goto parse_fail;
}
} else {
ret = mmc_davinci_parse_pdata(mmc);
if (ret) {
dev_err(&pdev->dev,
"could not parse platform data: %d\n", ret);
goto parse_fail;
} }
if (host->nr_sg > MAX_NR_SG || !host->nr_sg)
host->nr_sg = MAX_NR_SG;
init_mmcsd_host(host);
host->use_dma = use_dma;
host->mmc_irq = irq;
host->sdio_irq = platform_get_irq(pdev, 1);
if (host->use_dma) {
ret = davinci_acquire_dma_channels(host);
if (ret == -EPROBE_DEFER)
goto dma_probe_defer;
else if (ret)
host->use_dma = 0;
}
mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
id_entry = platform_get_device_id(pdev);
if (id_entry)
host->version = id_entry->driver_data;
mmc->ops = &mmc_davinci_ops;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
/* With no iommu coalescing pages, each phys_seg is a hw_seg.
* Each hw_seg uses one EDMA parameter RAM slot, always one
* channel and then usually some linked slots.
*/
mmc->max_segs = MAX_NR_SG;
/* EDMA limit per hw segment (one or two MBytes) */
mmc->max_seg_size = MAX_CCNT * rw_threshold;
/* MMC/SD controller limits for multiblock requests */
mmc->max_blk_size = 4095; /* BLEN is 12 bits */
mmc->max_blk_count = 65535; /* NBLK is 16 bits */
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
dev_dbg(mmc_dev(host->mmc), "max_segs=%d\n", mmc->max_segs);
dev_dbg(mmc_dev(host->mmc), "max_blk_size=%d\n", mmc->max_blk_size);
dev_dbg(mmc_dev(host->mmc), "max_req_size=%d\n", mmc->max_req_size);
dev_dbg(mmc_dev(host->mmc), "max_seg_size=%d\n", mmc->max_seg_size);
platform_set_drvdata(pdev, host);
ret = mmc_davinci_cpufreq_register(host);
if (ret) {
dev_err(&pdev->dev, "failed to register cpufreq\n");
goto cpu_freq_fail;
}
ret = mmc_add_host(mmc);
if (ret < 0)
goto mmc_add_host_fail;
ret = devm_request_irq(&pdev->dev, irq, mmc_davinci_irq, 0,
mmc_hostname(mmc), host);
if (ret)
goto request_irq_fail;
if (host->sdio_irq >= 0) {
ret = devm_request_irq(&pdev->dev, host->sdio_irq,
mmc_davinci_sdio_irq, 0,
mmc_hostname(mmc), host);
if (!ret)
mmc->caps |= MMC_CAP_SDIO_IRQ;
}
rename_region(mem, mmc_hostname(mmc));
dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n",
host->use_dma ? "DMA" : "PIO",
(mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
return 0;
request_irq_fail:
mmc_remove_host(mmc);
mmc_add_host_fail:
mmc_davinci_cpufreq_deregister(host);
cpu_freq_fail:
davinci_release_dma_channels(host);
parse_fail:
dma_probe_defer:
clk_disable_unprepare(host->clk);
clk_prepare_enable_fail:
clk_get_fail:
ioremap_fail:
mmc_free_host(mmc);
return ret;
}
static int __exit davinci_mmcsd_remove(struct platform_device *pdev)
{
struct mmc_davinci_host *host = platform_get_drvdata(pdev);
mmc_remove_host(host->mmc);
mmc_davinci_cpufreq_deregister(host);
davinci_release_dma_channels(host);
clk_disable_unprepare(host->clk);
mmc_free_host(host->mmc);
return 0;
}
#ifdef CONFIG_PM
static int davinci_mmcsd_suspend(struct device *dev)
{
struct mmc_davinci_host *host = dev_get_drvdata(dev);
writel(0, host->base + DAVINCI_MMCIM);
mmc_davinci_reset_ctrl(host, 1);
clk_disable(host->clk);
return 0;
}
static int davinci_mmcsd_resume(struct device *dev)
{
struct mmc_davinci_host *host = dev_get_drvdata(dev);
clk_enable(host->clk);
mmc_davinci_reset_ctrl(host, 0);
return 0;
}
static const struct dev_pm_ops davinci_mmcsd_pm = {
.suspend = davinci_mmcsd_suspend,
.resume = davinci_mmcsd_resume,
};
#define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm)
#else
#define davinci_mmcsd_pm_ops NULL
#endif
static struct platform_driver davinci_mmcsd_driver = {
.driver = {
.name = "davinci_mmc",
.pm = davinci_mmcsd_pm_ops,
.of_match_table = davinci_mmc_dt_ids,
},
.probe = davinci_mmcsd_probe,
.remove = __exit_p(davinci_mmcsd_remove),
.id_table = davinci_mmc_devtype,
};
module_platform_driver(davinci_mmcsd_driver);
MODULE_AUTHOR("Texas Instruments India");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MMC/SD driver for Davinci MMC controller");
MODULE_ALIAS("platform:davinci_mmc");
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