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raspberrypi-kernel
提交 df25f9da 编写于 作者: M Marc Kleine-Budde 提交者： Sascha Hauer
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imxmmc: use readl/writel 

Use readl/writel instead of direct pointer deref.
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
上级 2507b0a3
隐藏空白更改
内联 并排
Showing with 134 addition and 93 deletion
drivers/mmc/host/imxmmc.c
浏览文件 @ df25f9da
...@@ -43,6 +43,7 @@ struct imxmci_host { ...@@ -43,6 +43,7 @@ struct imxmci_host {
struct mmc_host *mmc; struct mmc_host *mmc;
spinlock_t lock; spinlock_t lock;
struct resource *res; struct resource *res;
void __iomem *base;
int irq; int irq;
imx_dmach_t dma; imx_dmach_t dma;
volatile unsigned int imask; volatile unsigned int imask;
...@@ -98,14 +99,22 @@ struct imxmci_host { ...@@ -98,14 +99,22 @@ struct imxmci_host {
static void imxmci_stop_clock(struct imxmci_host *host) static void imxmci_stop_clock(struct imxmci_host *host)
{ {
int i = 0; int i = 0;
MMC_STR_STP_CLK &= ~STR_STP_CLK_START_CLK; u16 reg;
reg = readw(host->base + MMC_REG_STR_STP_CLK);
writew(reg & ~STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
while (i < 0x1000) { while (i < 0x1000) {
if (!(i & 0x7f)) if (!(i & 0x7f)) {
MMC_STR_STP_CLK |= STR_STP_CLK_STOP_CLK; reg = readw(host->base + MMC_REG_STR_STP_CLK);
writew(reg | STR_STP_CLK_STOP_CLK,
host->base + MMC_REG_STR_STP_CLK);
}
if (!(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)) { reg = readw(host->base + MMC_REG_STATUS);
if (!(reg & STATUS_CARD_BUS_CLK_RUN)) {
/* Check twice before cut */ /* Check twice before cut */
if (!(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)) reg = readw(host->base + MMC_REG_STATUS);
if (!(reg & STATUS_CARD_BUS_CLK_RUN))
return; return;
} }
...@@ -119,8 +128,10 @@ static int imxmci_start_clock(struct imxmci_host *host) ...@@ -119,8 +128,10 @@ static int imxmci_start_clock(struct imxmci_host *host)
unsigned int trials = 0; unsigned int trials = 0;
unsigned int delay_limit = 128; unsigned int delay_limit = 128;
unsigned long flags; unsigned long flags;
u16 reg;
MMC_STR_STP_CLK &= ~STR_STP_CLK_STOP_CLK; reg = readw(host->base + MMC_REG_STR_STP_CLK);
writew(reg & ~STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK);
clear_bit(IMXMCI_PEND_STARTED_b, &host->pending_events); clear_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
...@@ -129,15 +140,18 @@ static int imxmci_start_clock(struct imxmci_host *host) ...@@ -129,15 +140,18 @@ static int imxmci_start_clock(struct imxmci_host *host)
* then 6 delay loops, but during card detection (low clockrate) * then 6 delay loops, but during card detection (low clockrate)
* it takes up to 5000 delay loops and sometimes fails for the first time * it takes up to 5000 delay loops and sometimes fails for the first time
*/ */
MMC_STR_STP_CLK |= STR_STP_CLK_START_CLK; reg = readw(host->base + MMC_REG_STR_STP_CLK);
writew(reg | STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
do { do {
unsigned int delay = delay_limit; unsigned int delay = delay_limit;
while (delay--) { while (delay--) {
if (MMC_STATUS & STATUS_CARD_BUS_CLK_RUN) reg = readw(host->base + MMC_REG_STATUS);
if (reg & STATUS_CARD_BUS_CLK_RUN)
/* Check twice before cut */ /* Check twice before cut */
if (MMC_STATUS & STATUS_CARD_BUS_CLK_RUN) reg = readw(host->base + MMC_REG_STATUS);
if (reg & STATUS_CARD_BUS_CLK_RUN)
return 0; return 0;
if (test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events)) if (test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events))
...@@ -151,8 +165,11 @@ static int imxmci_start_clock(struct imxmci_host *host) ...@@ -151,8 +165,11 @@ static int imxmci_start_clock(struct imxmci_host *host)
* IRQ or schedule delays this function execution and the clocks has * IRQ or schedule delays this function execution and the clocks has
* been already stopped by other means (response processing, SDHC HW) * been already stopped by other means (response processing, SDHC HW)
*/ */
if (!test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events)) if (!test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events)) {
MMC_STR_STP_CLK |= STR_STP_CLK_START_CLK; reg = readw(host->base + MMC_REG_STR_STP_CLK);
writew(reg | STR_STP_CLK_START_CLK,
host->base + MMC_REG_STR_STP_CLK);
}
local_irq_restore(flags); local_irq_restore(flags);
} while (++trials < 256); } while (++trials < 256);
...@@ -162,23 +179,20 @@ static int imxmci_start_clock(struct imxmci_host *host) ...@@ -162,23 +179,20 @@ static int imxmci_start_clock(struct imxmci_host *host)
return -1; return -1;
} }
static void imxmci_softreset(void) static void imxmci_softreset(struct imxmci_host *host)
{ {
int i;
/* reset sequence */ /* reset sequence */
MMC_STR_STP_CLK = 0x8; writew(0x08, host->base + MMC_REG_STR_STP_CLK);
MMC_STR_STP_CLK = 0xD; writew(0x0D, host->base + MMC_REG_STR_STP_CLK);
MMC_STR_STP_CLK = 0x5;
MMC_STR_STP_CLK = 0x5; for (i = 0; i < 8; i++)
MMC_STR_STP_CLK = 0x5; writew(0x05, host->base + MMC_REG_STR_STP_CLK);
MMC_STR_STP_CLK = 0x5;
MMC_STR_STP_CLK = 0x5; writew(0xff, host->base + MMC_REG_RES_TO);
MMC_STR_STP_CLK = 0x5; writew(512, host->base + MMC_REG_BLK_LEN);
MMC_STR_STP_CLK = 0x5; writew(1, host->base + MMC_REG_NOB);
MMC_STR_STP_CLK = 0x5;
MMC_RES_TO = 0xff;
MMC_BLK_LEN = 512;
MMC_NOB = 1;
} }
static int imxmci_busy_wait_for_status(struct imxmci_host *host, static int imxmci_busy_wait_for_status(struct imxmci_host *host,
...@@ -195,7 +209,7 @@ static int imxmci_busy_wait_for_status(struct imxmci_host *host, ...@@ -195,7 +209,7 @@ static int imxmci_busy_wait_for_status(struct imxmci_host *host,
return -1; return -1;
} }
udelay(2); udelay(2);
*pstat |= MMC_STATUS; *pstat |= readw(host->base + MMC_REG_STATUS);
} }
if (!loops) if (!loops)
return 0; return 0;
...@@ -220,8 +234,8 @@ static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data) ...@@ -220,8 +234,8 @@ static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
host->data = data; host->data = data;
data->bytes_xfered = 0; data->bytes_xfered = 0;
MMC_NOB = nob; writew(nob, host->base + MMC_REG_NOB);
MMC_BLK_LEN = blksz; writew(blksz, host->base + MMC_REG_BLK_LEN);
/* /*
* DMA cannot be used for small block sizes, we have to use CPU driven transfers otherwise. * DMA cannot be used for small block sizes, we have to use CPU driven transfers otherwise.
...@@ -237,8 +251,8 @@ static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data) ...@@ -237,8 +251,8 @@ static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
host->dma_dir = DMA_FROM_DEVICE; host->dma_dir = DMA_FROM_DEVICE;
/* Hack to enable read SCR */ /* Hack to enable read SCR */
MMC_NOB = 1; writew(1, host->base + MMC_REG_NOB);
MMC_BLK_LEN = 512; writew(512, host->base + MMC_REG_BLK_LEN);
} else { } else {
host->dma_dir = DMA_TO_DEVICE; host->dma_dir = DMA_TO_DEVICE;
} }
...@@ -259,7 +273,8 @@ static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data) ...@@ -259,7 +273,8 @@ static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
data->sg_len, host->dma_dir); data->sg_len, host->dma_dir);
imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz, imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_READ); host->res->start + MMC_REG_BUFFER_ACCESS,
DMA_MODE_READ);
/*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_READ, IMX_DMA_WIDTH_16, CCR_REN);*/ /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_READ, IMX_DMA_WIDTH_16, CCR_REN);*/
CCR(host->dma) = CCR_DMOD_LINEAR | CCR_DSIZ_32 | CCR_SMOD_FIFO | CCR_SSIZ_16 | CCR_REN; CCR(host->dma) = CCR_DMOD_LINEAR | CCR_DSIZ_32 | CCR_SMOD_FIFO | CCR_SSIZ_16 | CCR_REN;
...@@ -270,7 +285,8 @@ static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data) ...@@ -270,7 +285,8 @@ static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
data->sg_len, host->dma_dir); data->sg_len, host->dma_dir);
imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz, imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_WRITE); host->res->start + MMC_REG_BUFFER_ACCESS,
DMA_MODE_WRITE);
/*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_WRITE, IMX_DMA_WIDTH_16, CCR_REN);*/ /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_WRITE, IMX_DMA_WIDTH_16, CCR_REN);*/
CCR(host->dma) = CCR_SMOD_LINEAR | CCR_SSIZ_32 | CCR_DMOD_FIFO | CCR_DSIZ_16 | CCR_REN; CCR(host->dma) = CCR_SMOD_LINEAR | CCR_SSIZ_32 | CCR_DMOD_FIFO | CCR_DSIZ_16 | CCR_REN;
...@@ -341,10 +357,10 @@ static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd, ...@@ -341,10 +357,10 @@ static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd,
if (host->actual_bus_width == MMC_BUS_WIDTH_4) if (host->actual_bus_width == MMC_BUS_WIDTH_4)
cmdat |= CMD_DAT_CONT_BUS_WIDTH_4; cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
MMC_CMD = cmd->opcode; writew(cmd->opcode, host->base + MMC_REG_CMD);
MMC_ARGH = cmd->arg >> 16; writew(cmd->arg >> 16, host->base + MMC_REG_ARGH);
MMC_ARGL = cmd->arg & 0xffff; writew(cmd->arg & 0xffff, host->base + MMC_REG_ARGL);
MMC_CMD_DAT_CONT = cmdat; writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT);
atomic_set(&host->stuck_timeout, 0); atomic_set(&host->stuck_timeout, 0);
set_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events); set_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events);
...@@ -363,7 +379,7 @@ static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd, ...@@ -363,7 +379,7 @@ static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd,
spin_lock_irqsave(&host->lock, flags); spin_lock_irqsave(&host->lock, flags);
host->imask = imask; host->imask = imask;
MMC_INT_MASK = host->imask; writew(host->imask, host->base + MMC_REG_INT_MASK);
spin_unlock_irqrestore(&host->lock, flags); spin_unlock_irqrestore(&host->lock, flags);
dev_dbg(mmc_dev(host->mmc), "CMD%02d (0x%02x) mask set to 0x%04x\n", dev_dbg(mmc_dev(host->mmc), "CMD%02d (0x%02x) mask set to 0x%04x\n",
...@@ -382,7 +398,7 @@ static void imxmci_finish_request(struct imxmci_host *host, struct mmc_request * ...@@ -382,7 +398,7 @@ static void imxmci_finish_request(struct imxmci_host *host, struct mmc_request *
IMXMCI_PEND_DMA_DATA_m | IMXMCI_PEND_CPU_DATA_m); IMXMCI_PEND_DMA_DATA_m | IMXMCI_PEND_CPU_DATA_m);
host->imask = IMXMCI_INT_MASK_DEFAULT; host->imask = IMXMCI_INT_MASK_DEFAULT;
MMC_INT_MASK = host->imask; writew(host->imask, host->base + MMC_REG_INT_MASK);
spin_unlock_irqrestore(&host->lock, flags); spin_unlock_irqrestore(&host->lock, flags);
...@@ -448,14 +464,14 @@ static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat) ...@@ -448,14 +464,14 @@ static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat)
if (cmd->flags & MMC_RSP_PRESENT) { if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136) { if (cmd->flags & MMC_RSP_136) {
for (i = 0; i < 4; i++) { for (i = 0; i < 4; i++) {
u32 d = MMC_RES_FIFO & 0xffff; a = readw(host->base + MMC_REG_RES_FIFO);
u32 e = MMC_RES_FIFO & 0xffff; b = readw(host->base + MMC_REG_RES_FIFO);
cmd->resp[i] = d << 16 | e; cmd->resp[i] = a << 16 | b;
} }
} else { } else {
a = MMC_RES_FIFO & 0xffff; a = readw(host->base + MMC_REG_RES_FIFO);
b = MMC_RES_FIFO & 0xffff; b = readw(host->base + MMC_REG_RES_FIFO);
c = MMC_RES_FIFO & 0xffff; c = readw(host->base + MMC_REG_RES_FIFO);
cmd->resp[0] = a << 24 | b << 8 | c >> 8; cmd->resp[0] = a << 24 | b << 8 | c >> 8;
} }
} }
...@@ -468,7 +484,7 @@ static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat) ...@@ -468,7 +484,7 @@ static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat)
/* Wait for FIFO to be empty before starting DMA write */ /* Wait for FIFO to be empty before starting DMA write */
stat = MMC_STATUS; stat = readw(host->base + MMC_REG_STATUS);
if (imxmci_busy_wait_for_status(host, &stat, if (imxmci_busy_wait_for_status(host, &stat,
STATUS_APPL_BUFF_FE, STATUS_APPL_BUFF_FE,
40, "imxmci_cmd_done DMA WR") < 0) { 40, "imxmci_cmd_done DMA WR") < 0) {
...@@ -558,7 +574,7 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat) ...@@ -558,7 +574,7 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
for (i = burst_len; i >= 2 ; i -= 2) { for (i = burst_len; i >= 2 ; i -= 2) {
u16 data; u16 data;
data = MMC_BUFFER_ACCESS; data = readw(host->base + MMC_REG_BUFFER_ACCESS);
udelay(10); /* required for clocks < 8MHz*/ udelay(10); /* required for clocks < 8MHz*/
if (host->data_cnt+2 <= host->dma_size) { if (host->data_cnt+2 <= host->dma_size) {
*(host->data_ptr++) = data; *(host->data_ptr++) = data;
...@@ -569,7 +585,7 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat) ...@@ -569,7 +585,7 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
host->data_cnt += 2; host->data_cnt += 2;
} }
stat = MMC_STATUS; stat = readw(host->base + MMC_REG_STATUS);
dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read %d burst %d STATUS = 0x%x\n", dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read %d burst %d STATUS = 0x%x\n",
host->data_cnt, burst_len, stat); host->data_cnt, burst_len, stat);
...@@ -603,9 +619,9 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat) ...@@ -603,9 +619,9 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
} }
for (i = burst_len; i > 0 ; i -= 2) for (i = burst_len; i > 0 ; i -= 2)
MMC_BUFFER_ACCESS = *(host->data_ptr++); writew(*(host->data_ptr++), host->base + MMC_REG_BUFFER_ACCESS);
stat = MMC_STATUS; stat = readw(host->base + MMC_REG_STATUS);
dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data write burst %d STATUS = 0x%x\n", dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data write burst %d STATUS = 0x%x\n",
burst_len, stat); burst_len, stat);
...@@ -620,7 +636,7 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat) ...@@ -620,7 +636,7 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
static void imxmci_dma_irq(int dma, void *devid) static void imxmci_dma_irq(int dma, void *devid)
{ {
struct imxmci_host *host = devid; struct imxmci_host *host = devid;
uint32_t stat = MMC_STATUS; u32 stat = readw(host->base + MMC_REG_STATUS);
atomic_set(&host->stuck_timeout, 0); atomic_set(&host->stuck_timeout, 0);
host->status_reg = stat; host->status_reg = stat;
...@@ -631,10 +647,11 @@ static void imxmci_dma_irq(int dma, void *devid) ...@@ -631,10 +647,11 @@ static void imxmci_dma_irq(int dma, void *devid)
static irqreturn_t imxmci_irq(int irq, void *devid) static irqreturn_t imxmci_irq(int irq, void *devid)
{ {
struct imxmci_host *host = devid; struct imxmci_host *host = devid;
uint32_t stat = MMC_STATUS; u32 stat = readw(host->base + MMC_REG_STATUS);
int handled = 1; int handled = 1;
MMC_INT_MASK = host->imask | INT_MASK_SDIO | INT_MASK_AUTO_CARD_DETECT; writew(host->imask | INT_MASK_SDIO | INT_MASK_AUTO_CARD_DETECT,
host->base + MMC_REG_INT_MASK);
atomic_set(&host->stuck_timeout, 0); atomic_set(&host->stuck_timeout, 0);
host->status_reg = stat; host->status_reg = stat;
...@@ -655,7 +672,7 @@ static void imxmci_tasklet_fnc(unsigned long data) ...@@ -655,7 +672,7 @@ static void imxmci_tasklet_fnc(unsigned long data)
if (atomic_read(&host->stuck_timeout) > 4) { if (atomic_read(&host->stuck_timeout) > 4) {
char *what; char *what;
timeout = 1; timeout = 1;
stat = MMC_STATUS; stat = readw(host->base + MMC_REG_STATUS);
host->status_reg = stat; host->status_reg = stat;
if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
...@@ -671,12 +688,20 @@ static void imxmci_tasklet_fnc(unsigned long data) ...@@ -671,12 +688,20 @@ static void imxmci_tasklet_fnc(unsigned long data)
else else
what = "???"; what = "???";
dev_err(mmc_dev(host->mmc), "%s TIMEOUT, hardware stucked STATUS = 0x%04x IMASK = 0x%04x\n", dev_err(mmc_dev(host->mmc),
what, stat, MMC_INT_MASK); "%s TIMEOUT, hardware stucked STATUS = 0x%04x IMASK = 0x%04x\n",
dev_err(mmc_dev(host->mmc), "CMD_DAT_CONT = 0x%04x, MMC_BLK_LEN = 0x%04x, MMC_NOB = 0x%04x, DMA_CCR = 0x%08x\n", what, stat,
MMC_CMD_DAT_CONT, MMC_BLK_LEN, MMC_NOB, CCR(host->dma)); readw(host->base + MMC_REG_INT_MASK));
dev_err(mmc_dev(host->mmc),
"CMD_DAT_CONT = 0x%04x, MMC_BLK_LEN = 0x%04x, MMC_NOB = 0x%04x, DMA_CCR = 0x%08x\n",
readw(host->base + MMC_REG_CMD_DAT_CONT),
readw(host->base + MMC_REG_BLK_LEN),
readw(host->base + MMC_REG_NOB),
CCR(host->dma));
dev_err(mmc_dev(host->mmc), "CMD%d, prevCMD%d, bus %d-bit, dma_size = 0x%x\n", dev_err(mmc_dev(host->mmc), "CMD%d, prevCMD%d, bus %d-bit, dma_size = 0x%x\n",
host->cmd?host->cmd->opcode:0, host->prev_cmd_code, 1 << host->actual_bus_width, host->dma_size); host->cmd ? host->cmd->opcode : 0,
host->prev_cmd_code,
1 << host->actual_bus_width, host->dma_size);
} }
if (!host->present || timeout) if (!host->present || timeout)
...@@ -686,7 +711,7 @@ static void imxmci_tasklet_fnc(unsigned long data) ...@@ -686,7 +711,7 @@ static void imxmci_tasklet_fnc(unsigned long data)
if (test_bit(IMXMCI_PEND_IRQ_b, &host->pending_events) || timeout) { if (test_bit(IMXMCI_PEND_IRQ_b, &host->pending_events) || timeout) {
clear_bit(IMXMCI_PEND_IRQ_b, &host->pending_events); clear_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
stat = MMC_STATUS; stat = readw(host->base + MMC_REG_STATUS);
/* /*
* This is not required in theory, but there is chance to miss some flag * This is not required in theory, but there is chance to miss some flag
* which clears automatically by mask write, FreeScale original code keeps * which clears automatically by mask write, FreeScale original code keeps
...@@ -711,7 +736,7 @@ static void imxmci_tasklet_fnc(unsigned long data) ...@@ -711,7 +736,7 @@ static void imxmci_tasklet_fnc(unsigned long data)
} }
if (test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events)) { if (test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events)) {
stat |= MMC_STATUS; stat |= readw(host->base + MMC_REG_STATUS);
if (imxmci_cpu_driven_data(host, &stat)) { if (imxmci_cpu_driven_data(host, &stat)) {
if (test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) if (test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
imxmci_cmd_done(host, stat); imxmci_cmd_done(host, stat);
...@@ -725,7 +750,7 @@ static void imxmci_tasklet_fnc(unsigned long data) ...@@ -725,7 +750,7 @@ static void imxmci_tasklet_fnc(unsigned long data)
if (test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events) && if (test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events) &&
!test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) { !test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
stat = MMC_STATUS; stat = readw(host->base + MMC_REG_STATUS);
/* Same as above */ /* Same as above */
stat |= host->status_reg; stat |= host->status_reg;
...@@ -813,6 +838,7 @@ static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) ...@@ -813,6 +838,7 @@ static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
if (ios->clock) { if (ios->clock) {
unsigned int clk; unsigned int clk;
u16 reg;
/* The prescaler is 5 for PERCLK2 equal to 96MHz /* The prescaler is 5 for PERCLK2 equal to 96MHz
* then 96MHz / 5 = 19.2 MHz * then 96MHz / 5 = 19.2 MHz
...@@ -844,17 +870,22 @@ static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) ...@@ -844,17 +870,22 @@ static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
break; break;
} }
MMC_STR_STP_CLK |= STR_STP_CLK_ENABLE; /* enable controller */ /* enable controller */
reg = readw(host->base + MMC_REG_STR_STP_CLK);
writew(reg | STR_STP_CLK_ENABLE,
host->base + MMC_REG_STR_STP_CLK);
imxmci_stop_clock(host); imxmci_stop_clock(host);
MMC_CLK_RATE = (prescaler << 3) | clk; writew((prescaler << 3) | clk, host->base + MMC_REG_CLK_RATE);
/* /*
* Under my understanding, clock should not be started there, because it would * Under my understanding, clock should not be started there, because it would
* initiate SDHC sequencer and send last or random command into card * initiate SDHC sequencer and send last or random command into card
*/ */
/* imxmci_start_clock(host); */ /* imxmci_start_clock(host); */
dev_dbg(mmc_dev(host->mmc), "MMC_CLK_RATE: 0x%08x\n", MMC_CLK_RATE); dev_dbg(mmc_dev(host->mmc),
"MMC_CLK_RATE: 0x%08x\n",
readw(host->base + MMC_REG_CLK_RATE));
} else { } else {
imxmci_stop_clock(host); imxmci_stop_clock(host);
} }
...@@ -913,6 +944,7 @@ static int imxmci_probe(struct platform_device *pdev) ...@@ -913,6 +944,7 @@ static int imxmci_probe(struct platform_device *pdev)
struct imxmci_host *host = NULL; struct imxmci_host *host = NULL;
struct resource *r; struct resource *r;
int ret = 0, irq; int ret = 0, irq;
u16 rev_no;
printk(KERN_INFO "i.MX mmc driver\n"); printk(KERN_INFO "i.MX mmc driver\n");
...@@ -921,7 +953,8 @@ static int imxmci_probe(struct platform_device *pdev) ...@@ -921,7 +953,8 @@ static int imxmci_probe(struct platform_device *pdev)
if (!r || irq < 0) if (!r || irq < 0)
return -ENXIO; return -ENXIO;
if (!request_mem_region(r->start, 0x100, pdev->name)) r = request_mem_region(r->start, resource_size(r), pdev->name);
if (!r)
return -EBUSY; return -EBUSY;
mmc = mmc_alloc_host(sizeof(struct imxmci_host), &pdev->dev); mmc = mmc_alloc_host(sizeof(struct imxmci_host), &pdev->dev);
...@@ -945,6 +978,12 @@ static int imxmci_probe(struct platform_device *pdev) ...@@ -945,6 +978,12 @@ static int imxmci_probe(struct platform_device *pdev)
mmc->max_blk_count = 65535; mmc->max_blk_count = 65535;
host = mmc_priv(mmc); host = mmc_priv(mmc);
host->base = ioremap(r->start, resource_size(r));
if (!host->base) {
ret = -ENOMEM;
goto out;
}
host->mmc = mmc; host->mmc = mmc;
host->dma_allocated = 0; host->dma_allocated = 0;
host->pdata = pdev->dev.platform_data; host->pdata = pdev->dev.platform_data;
...@@ -972,18 +1011,20 @@ static int imxmci_probe(struct platform_device *pdev) ...@@ -972,18 +1011,20 @@ static int imxmci_probe(struct platform_device *pdev)
imx_gpio_mode(PB12_PF_SD_CLK); imx_gpio_mode(PB12_PF_SD_CLK);
imx_gpio_mode(PB13_PF_SD_CMD); imx_gpio_mode(PB13_PF_SD_CMD);
imxmci_softreset(); imxmci_softreset(host);
if (MMC_REV_NO != 0x390) { rev_no = readw(host->base + MMC_REG_REV_NO);
if (rev_no != 0x390) {
dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n", dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
MMC_REV_NO); readw(host->base + MMC_REG_REV_NO));
goto out; goto out;
} }
MMC_READ_TO = 0x2db4; /* recommended in data sheet */ /* recommended in data sheet */
writew(0x2db4, host->base + MMC_REG_READ_TO);
host->imask = IMXMCI_INT_MASK_DEFAULT; host->imask = IMXMCI_INT_MASK_DEFAULT;
MMC_INT_MASK = host->imask; writew(host->imask, host->base + MMC_REG_INT_MASK);
host->dma = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_LOW); host->dma = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_LOW);
if(host->dma < 0) { if(host->dma < 0) {
...@@ -1029,10 +1070,12 @@ static int imxmci_probe(struct platform_device *pdev) ...@@ -1029,10 +1070,12 @@ static int imxmci_probe(struct platform_device *pdev)
clk_disable(host->clk); clk_disable(host->clk);
clk_put(host->clk); clk_put(host->clk);
} }
if (host->base)
iounmap(host->base);
} }
if (mmc) if (mmc)
mmc_free_host(mmc); mmc_free_host(mmc);
release_mem_region(r->start, 0x100); release_mem_region(r->start, resource_size(r));
return ret; return ret;
} }
...@@ -1051,6 +1094,7 @@ static int imxmci_remove(struct platform_device *pdev) ...@@ -1051,6 +1094,7 @@ static int imxmci_remove(struct platform_device *pdev)
mmc_remove_host(mmc); mmc_remove_host(mmc);
free_irq(host->irq, host); free_irq(host->irq, host);
iounmap(host->base);
if (host->dma_allocated) { if (host->dma_allocated) {
imx_dma_free(host->dma); imx_dma_free(host->dma);
host->dma_allocated = 0; host->dma_allocated = 0;
...@@ -1061,7 +1105,7 @@ static int imxmci_remove(struct platform_device *pdev) ...@@ -1061,7 +1105,7 @@ static int imxmci_remove(struct platform_device *pdev)
clk_disable(host->clk); clk_disable(host->clk);
clk_put(host->clk); clk_put(host->clk);
release_mem_region(host->res->start, 0x100); release_mem_region(host->res->start, resource_size(host->res));
mmc_free_host(mmc); mmc_free_host(mmc);
} }
......
drivers/mmc/host/imxmmc.h
浏览文件 @ df25f9da
#define MMC_REG_STR_STP_CLK 0x00
#define MMC_REG_STATUS 0x04
#define MMC_REG_CLK_RATE 0x08
#define MMC_REG_CMD_DAT_CONT 0x0C
#define MMC_REG_RES_TO 0x10
#define MMC_REG_READ_TO 0x14
#define MMC_REG_BLK_LEN 0x18
#define MMC_REG_NOB 0x1C
#define MMC_REG_REV_NO 0x20
#define MMC_REG_INT_MASK 0x24
#define MMC_REG_CMD 0x28
#define MMC_REG_ARGH 0x2C
#define MMC_REG_ARGL 0x30
#define MMC_REG_RES_FIFO 0x34
#define MMC_REG_BUFFER_ACCESS 0x38
# define __REG16(x) (*((volatile u16 *)IO_ADDRESS(x))) #define STR_STP_CLK_IPG_CLK_GATE_DIS (1<<15)
#define STR_STP_CLK_IPG_PERCLK_GATE_DIS (1<<14)
#define MMC_STR_STP_CLK __REG16(IMX_MMC_BASE + 0x00)
#define MMC_STATUS __REG16(IMX_MMC_BASE + 0x04)
#define MMC_CLK_RATE __REG16(IMX_MMC_BASE + 0x08)
#define MMC_CMD_DAT_CONT __REG16(IMX_MMC_BASE + 0x0C)
#define MMC_RES_TO __REG16(IMX_MMC_BASE + 0x10)
#define MMC_READ_TO __REG16(IMX_MMC_BASE + 0x14)
#define MMC_BLK_LEN __REG16(IMX_MMC_BASE + 0x18)
#define MMC_NOB __REG16(IMX_MMC_BASE + 0x1C)
#define MMC_REV_NO __REG16(IMX_MMC_BASE + 0x20)
#define MMC_INT_MASK __REG16(IMX_MMC_BASE + 0x24)
#define MMC_CMD __REG16(IMX_MMC_BASE + 0x28)
#define MMC_ARGH __REG16(IMX_MMC_BASE + 0x2C)
#define MMC_ARGL __REG16(IMX_MMC_BASE + 0x30)
#define MMC_RES_FIFO __REG16(IMX_MMC_BASE + 0x34)
#define MMC_BUFFER_ACCESS __REG16(IMX_MMC_BASE + 0x38)
#define MMC_BUFFER_ACCESS_OFS 0x38
#define STR_STP_CLK_ENDIAN (1<<5) #define STR_STP_CLK_ENDIAN (1<<5)
#define STR_STP_CLK_RESET (1<<3) #define STR_STP_CLK_RESET (1<<3)
#define STR_STP_CLK_ENABLE (1<<2) #define STR_STP_CLK_ENABLE (1<<2)
......
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