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jz4740-mmc: Stability and speed improvements.

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This commit is contained in:
Lars-Peter Clausen 2009-12-18 16:06:01 +01:00
parent 24c8a8bc38
commit ddd8424992
1 changed files with 120 additions and 44 deletions
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164
target/linux/xburst/files-2.6.31/drivers/mmc/host/jz_mmc.c
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@ -118,28 +118,37 @@ struct jz4740_mmc_host {
int max_clock;
uint32_t cmdat;
uint16_t irq_mask;
spinlock_t lock;
struct timer_list clock_timer;
struct timer_list timeout_timer;
unsigned waiting:1;
};
static void jz4740_mmc_cmd_done(struct jz4740_mmc_host *host);
static void jz4740_mmc_enable_irq(struct jz4740_mmc_host *host, unsigned int irq)
{
uint16_t mask;
mask = readw(host->base + JZ_REG_MMC_IMASK);
mask &= ~irq;
writew(mask, host->base + JZ_REG_MMC_IMASK);
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
host->irq_mask &= ~irq;
writew(host->irq_mask, host->base + JZ_REG_MMC_IMASK);
spin_unlock_irqrestore(&host->lock, flags);
}
static void jz4740_mmc_disable_irq(struct jz4740_mmc_host *host, unsigned int irq)
{
uint16_t mask;
mask = readw(host->base + JZ_REG_MMC_IMASK);
mask |= irq;
writew(mask, host->base + JZ_REG_MMC_IMASK);
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
host->irq_mask |= irq;
writew(host->irq_mask, host->base + JZ_REG_MMC_IMASK);
spin_unlock_irqrestore(&host->lock, flags);
}
static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host, bool start_transfer)
@ -177,48 +186,81 @@ static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
spin_lock_irqsave(&host->lock, flags);
req = host->req;
host->req = NULL;
host->waiting = 0;
spin_unlock_irqrestore(&host->lock, flags);
if (!unlikely(req))
return;
if (req->cmd->error != 0)
/* if (req->cmd->error != 0) {
printk("error\n");
jz4740_mmc_reset(host);
}*/
mmc_request_done(host->mmc, req);
}
static void jz4740_mmc_write_data(struct jz4740_mmc_host *host, struct mmc_data *data) {
struct scatterlist *sg;
uint32_t *sg_pointer;
int i, status;
int status;
size_t i, j;
uint16_t snob;
for (sg = data->sg; sg; sg = sg_next(sg)) {
sg_pointer = page_address(sg_page(sg)) + sg->offset;
i = 0;
while (i < sg->length) {
sg_pointer = sg_virt(sg);
i = sg->length / 4;
j = i >> 3;
i = i & 0x7;
while (j) {
do {
status = readl(host->base + JZ_REG_MMC_STATUS);
if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK)
goto err;
} while (status & JZ_MMC_STATUS_DATA_FIFO_FULL);
writel(*sg_pointer, host->base + JZ_REG_MMC_TXFIFO);
++sg_pointer;
i += 4;
status = readw(host->base + JZ_REG_MMC_IREG);
} while (!(status & JZ_MMC_IRQ_TXFIFO_WR_REQ));
writew(JZ_MMC_IRQ_TXFIFO_WR_REQ, host->base + JZ_REG_MMC_IREG);
writel(sg_pointer[0], host->base + JZ_REG_MMC_TXFIFO);
writel(sg_pointer[1], host->base + JZ_REG_MMC_TXFIFO);
writel(sg_pointer[2], host->base + JZ_REG_MMC_TXFIFO);
writel(sg_pointer[3], host->base + JZ_REG_MMC_TXFIFO);
writel(sg_pointer[4], host->base + JZ_REG_MMC_TXFIFO);
writel(sg_pointer[5], host->base + JZ_REG_MMC_TXFIFO);
writel(sg_pointer[6], host->base + JZ_REG_MMC_TXFIFO);
writel(sg_pointer[7], host->base + JZ_REG_MMC_TXFIFO);
sg_pointer += 8;
--j;
}
if (i) {
do {
status = readw(host->base + JZ_REG_MMC_IREG);
} while (!(status & JZ_MMC_IRQ_TXFIFO_WR_REQ));
writew(JZ_MMC_IRQ_TXFIFO_WR_REQ, host->base + JZ_REG_MMC_IREG);
while (i) {
writel(*sg_pointer, host->base + JZ_REG_MMC_TXFIFO);
++sg_pointer;
--i;
}
}
data->bytes_xfered += sg->length;
}
status = readl(host->base + JZ_REG_MMC_STATUS);
if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK)
goto err;
writew(JZ_MMC_IRQ_TXFIFO_WR_REQ, host->base + JZ_REG_MMC_IREG);
do {
status = readl(host->base + JZ_REG_MMC_STATUS);
} while ((status & JZ_MMC_STATUS_DATA_TRAN_DONE) == 0);
writew(JZ_MMC_IRQ_DATA_TRAN_DONE, host->base + JZ_REG_MMC_IREG);
return;
err:
if(status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
host->cmd->error = -ETIMEDOUT;
host->req->cmd->error = -ETIMEDOUT;
data->error = -ETIMEDOUT;
} else {
host->cmd->error = -EILSEQ;
host->req->cmd->error = -EILSEQ;
data->error = -EILSEQ;
}
}
@ -238,30 +280,48 @@ static void jz4740_mmc_timeout(unsigned long data)
spin_unlock_irqrestore(&host->lock, flags);
host->cmd->error = -ETIMEDOUT;
host->req->cmd->error = -ETIMEDOUT;
jz4740_mmc_request_done(host);
}
static void jz4740_mmc_read_data(struct jz4740_mmc_host *host, struct mmc_data *data) {
struct scatterlist *sg;
void *sg_pointer;
uint32_t *sg_pointer;
uint32_t d;
int status = 0;
size_t i = 0;
size_t i, j;
for (sg = data->sg; sg; sg = sg_next(sg)) {
sg_pointer = sg_virt(sg);
i = sg->length;
j = i >> 5;
i = i & 0x1f;
while (j) {
do {
status = readw(host->base + JZ_REG_MMC_IREG);
} while (!(status & JZ_MMC_IRQ_RXFIFO_RD_REQ));
writew(JZ_MMC_IRQ_RXFIFO_RD_REQ, host->base + JZ_REG_MMC_IREG);
sg_pointer[0] = readl(host->base + JZ_REG_MMC_RXFIFO);
sg_pointer[1] = readl(host->base + JZ_REG_MMC_RXFIFO);
sg_pointer[2] = readl(host->base + JZ_REG_MMC_RXFIFO);
sg_pointer[3] = readl(host->base + JZ_REG_MMC_RXFIFO);
sg_pointer[4] = readl(host->base + JZ_REG_MMC_RXFIFO);
sg_pointer[5] = readl(host->base + JZ_REG_MMC_RXFIFO);
sg_pointer[6] = readl(host->base + JZ_REG_MMC_RXFIFO);
sg_pointer[7] = readl(host->base + JZ_REG_MMC_RXFIFO);
sg_pointer += 8;
--j;
}
while (i >= 4) {
do {
status = readl(host->base + JZ_REG_MMC_STATUS);
if (status & JZ_MMC_STATUS_READ_ERROR_MASK)
goto err;
} while (status & JZ_MMC_STATUS_DATA_FIFO_EMPTY);
d = readl(host->base + JZ_REG_MMC_RXFIFO);
memcpy(sg_pointer, &d, 4);
} while ((status & JZ_MMC_STATUS_DATA_FIFO_EMPTY));
sg_pointer += 4;
*sg_pointer = readl(host->base + JZ_REG_MMC_RXFIFO);
++sg_pointer;
i -= 4;
}
if (i > 0) {
@ -273,6 +333,9 @@ static void jz4740_mmc_read_data(struct jz4740_mmc_host *host, struct mmc_data *
flush_dcache_page(sg_page(sg));
}
if (status & JZ_MMC_STATUS_READ_ERROR_MASK)
goto err;
/* For whatever reason there is sometime one word more in the fifo then
* requested */
while ((status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) == 0) {
@ -283,10 +346,10 @@ static void jz4740_mmc_read_data(struct jz4740_mmc_host *host, struct mmc_data *
err:
if(status & JZ_MMC_STATUS_TIMEOUT_READ) {
host->cmd->error = -ETIMEDOUT;
host->req->cmd->error = -ETIMEDOUT;
data->error = -ETIMEDOUT;
} else {
host->cmd->error = -EILSEQ;
host->req->cmd->error = -EILSEQ;
data->error = -EILSEQ;
}
}
@ -306,25 +369,37 @@ static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
static irqreturn_t jz_mmc_irq(int irq, void *devid)
{
struct jz4740_mmc_host *host = devid;
uint16_t irq_reg, status;
uint16_t irq_reg, status, tmp;
unsigned long flags;
irqreturn_t ret = IRQ_HANDLED;
if (!host->req || !host->cmd) {
return IRQ_HANDLED;
irq_reg = readw(host->base + JZ_REG_MMC_IREG);
tmp = irq_reg;
spin_lock(&host->lock);
irq_reg &= ~host->irq_mask;
spin_unlock(&host->lock);
if (irq_reg & JZ_MMC_IRQ_SDIO) {
writew(JZ_MMC_IRQ_SDIO, host->base + JZ_REG_MMC_IREG);
mmc_signal_sdio_irq(host->mmc);
}
if (!host->req || !host->cmd) {
goto handled;
}
spin_lock_irqsave(&host->lock, flags);
if (!host->waiting) {
spin_unlock_irqrestore(&host->lock, flags);
return IRQ_HANDLED;
goto handled;
}
host->waiting = 0;
spin_unlock_irqrestore(&host->lock, flags);
del_timer(&host->timeout_timer);
irq_reg = readw(host->base + JZ_REG_MMC_IREG);
status = readl(host->base + JZ_REG_MMC_STATUS);
if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
@ -345,11 +420,10 @@ static irqreturn_t jz_mmc_irq(int irq, void *devid)
ret = IRQ_WAKE_THREAD;
}
if (irq_reg & JZ_MMC_IRQ_SDIO) {
writew(JZ_MMC_IRQ_SDIO, host->base + JZ_REG_MMC_IREG);
mmc_signal_sdio_irq(host->mmc);
}
return ret;
handled:
writew(0xff, host->base + JZ_REG_MMC_IREG);
return IRQ_HANDLED;
}
static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate) {
@ -431,7 +505,7 @@ static void jz4740_mmc_send_command(struct jz4740_mmc_host *host, struct mmc_com
host->waiting = 1;
jz4740_mmc_clock_enable(host, 1);
mod_timer(&host->timeout_timer, HZ);
mod_timer(&host->timeout_timer, 4*HZ);
}
static void jz4740_mmc_cmd_done(struct jz4740_mmc_host *host)
@ -456,6 +530,7 @@ static void jz4740_mmc_cmd_done(struct jz4740_mmc_host *host)
do {
status = readl(host->base + JZ_REG_MMC_STATUS);
} while ((status & JZ_MMC_STATUS_PRG_DONE) == 0);
writew(JZ_MMC_IRQ_PRG_DONE, host->base + JZ_REG_MMC_IREG);
}
jz4740_mmc_request_done(host);
@ -718,6 +793,7 @@ static int __devinit jz4740_mmc_probe(struct platform_device* pdev)
host->pdata = pdata;
host->max_clock = JZ_MMC_CLK_RATE;
spin_lock_init(&host->lock);
host->irq_mask = 0xffff;
host->card_detect_irq = gpio_to_irq(pdata->gpio_card_detect);