Skip to content

Commit

Permalink
mmc: bfin_sdh: Add support for new RSI controller in bf60x
Browse files Browse the repository at this point in the history 
In BF60x RSI controller:
1) MMR read/write width differs.
2) PWR and CTL MMRs are merged to together.
3) ROD and PD_DAT3 bit masks are obsolete.
4) New RSI block size MMR is defined.
5) The definition of DMA descriptor set size is changed.
6) set_ios should powers up controller in 2 steps.

In addition, this patch cleans up the spin locks.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
  • Loading branch information
Sonic Zhang authored and Chris Ball committed Sep 4, 2012
1 parent 0462566 commit 4ffdcf0
Showing 1 changed file with 128 additions and 52 deletions.
180 changes: 128 additions & 52 deletions drivers/mmc/host/bfin_sdh.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,7 @@
#include <asm/portmux.h>
#include <asm/bfin_sdh.h>

#if defined(CONFIG_BF51x)
#define bfin_read_SDH_PWR_CTL bfin_read_RSI_PWR_CTL
#define bfin_write_SDH_PWR_CTL bfin_write_RSI_PWR_CTL
#if defined(CONFIG_BF51x) || defined(__ADSPBF60x__)
#define bfin_read_SDH_CLK_CTL bfin_read_RSI_CLK_CTL
#define bfin_write_SDH_CLK_CTL bfin_write_RSI_CLK_CTL
#define bfin_write_SDH_ARGUMENT bfin_write_RSI_ARGUMENT
Expand All @@ -45,8 +43,16 @@
#define bfin_write_SDH_E_STATUS bfin_write_RSI_E_STATUS
#define bfin_read_SDH_STATUS bfin_read_RSI_STATUS
#define bfin_write_SDH_MASK0 bfin_write_RSI_MASK0
#define bfin_write_SDH_E_MASK bfin_write_RSI_E_MASK
#define bfin_read_SDH_CFG bfin_read_RSI_CFG
#define bfin_write_SDH_CFG bfin_write_RSI_CFG
# if defined(__ADSPBF60x__)
# define bfin_read_SDH_BLK_SIZE bfin_read_RSI_BLKSZ
# define bfin_write_SDH_BLK_SIZE bfin_write_RSI_BLKSZ
# else
# define bfin_read_SDH_PWR_CTL bfin_read_RSI_PWR_CTL
# define bfin_write_SDH_PWR_CTL bfin_write_RSI_PWR_CTL
# endif
#endif

struct sdh_host {
Expand All @@ -62,6 +68,7 @@ struct sdh_host {
dma_addr_t sg_dma;
int dma_len;

unsigned long sclk;
unsigned int imask;
unsigned int power_mode;
unsigned int clk_div;
Expand Down Expand Up @@ -127,11 +134,15 @@ static int sdh_setup_data(struct sdh_host *host, struct mmc_data *data)
/* Only supports power-of-2 block size */
if (data->blksz & (data->blksz - 1))
return -EINVAL;
#ifndef RSI_BLKSZ
data_ctl |= ((ffs(data->blksz) - 1) << 4);
#else
bfin_write_SDH_BLK_SIZE(data->blksz);
#endif

bfin_write_SDH_DATA_CTL(data_ctl);
/* the time of a host clock period in ns */
cycle_ns = 1000000000 / (get_sclk() / (2 * (host->clk_div + 1)));
cycle_ns = 1000000000 / (host->sclk / (2 * (host->clk_div + 1)));
timeout = data->timeout_ns / cycle_ns;
timeout += data->timeout_clks;
bfin_write_SDH_DATA_TIMER(timeout);
Expand All @@ -145,8 +156,13 @@ static int sdh_setup_data(struct sdh_host *host, struct mmc_data *data)

sdh_enable_stat_irq(host, (DAT_CRC_FAIL | DAT_TIME_OUT | DAT_END));
host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, host->dma_dir);
#if defined(CONFIG_BF54x)
dma_cfg |= DMAFLOW_ARRAY | NDSIZE_5 | RESTART | WDSIZE_32 | DMAEN;
#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
dma_cfg |= DMAFLOW_ARRAY | RESTART | WDSIZE_32 | DMAEN;
# ifdef RSI_BLKSZ
dma_cfg |= PSIZE_32 | NDSIZE_3;
# else
dma_cfg |= NDSIZE_5;
# endif
{
struct scatterlist *sg;
int i;
Expand All @@ -156,7 +172,7 @@ static int sdh_setup_data(struct sdh_host *host, struct mmc_data *data)
host->sg_cpu[i].x_count = sg_dma_len(sg) / 4;
host->sg_cpu[i].x_modify = 4;
dev_dbg(mmc_dev(host->mmc), "%d: start_addr:0x%lx, "
"cfg:0x%x, x_count:0x%x, x_modify:0x%x\n",
"cfg:0x%lx, x_count:0x%lx, x_modify:0x%lx\n",
i, host->sg_cpu[i].start_addr,
host->sg_cpu[i].cfg, host->sg_cpu[i].x_count,
host->sg_cpu[i].x_modify);
Expand All @@ -172,13 +188,15 @@ static int sdh_setup_data(struct sdh_host *host, struct mmc_data *data)
set_dma_curr_desc_addr(host->dma_ch, (unsigned long *)host->sg_dma);
set_dma_x_count(host->dma_ch, 0);
set_dma_x_modify(host->dma_ch, 0);
SSYNC();
set_dma_config(host->dma_ch, dma_cfg);
#elif defined(CONFIG_BF51x)
/* RSI DMA doesn't work in array mode */
dma_cfg |= WDSIZE_32 | DMAEN;
set_dma_start_addr(host->dma_ch, sg_dma_address(&data->sg[0]));
set_dma_x_count(host->dma_ch, length / 4);
set_dma_x_modify(host->dma_ch, 4);
SSYNC();
set_dma_config(host->dma_ch, dma_cfg);
#endif
bfin_write_SDH_DATA_CTL(bfin_read_SDH_DATA_CTL() | DTX_DMA_E | DTX_E);
Expand Down Expand Up @@ -296,7 +314,6 @@ static int sdh_data_done(struct sdh_host *host, unsigned int stat)
else
data->bytes_xfered = 0;

sdh_disable_stat_irq(host, DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN | TX_UNDERRUN);
bfin_write_SDH_STATUS_CLR(DAT_END_STAT | DAT_TIMEOUT_STAT | \
DAT_CRC_FAIL_STAT | DAT_BLK_END_STAT | RX_OVERRUN | TX_UNDERRUN);
bfin_write_SDH_DATA_CTL(0);
Expand All @@ -321,74 +338,115 @@ static void sdh_request(struct mmc_host *mmc, struct mmc_request *mrq)
dev_dbg(mmc_dev(host->mmc), "%s enter, mrp:%p, cmd:%p\n", __func__, mrq, mrq->cmd);
WARN_ON(host->mrq != NULL);

spin_lock(&host->lock);
host->mrq = mrq;
host->data = mrq->data;

if (mrq->data && mrq->data->flags & MMC_DATA_READ) {
ret = sdh_setup_data(host, mrq->data);
if (ret)
return;
goto data_err;
}

sdh_start_cmd(host, mrq->cmd);
data_err:
spin_unlock(&host->lock);
}

static void sdh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct sdh_host *host;
unsigned long flags;
u16 clk_ctl = 0;
#ifndef RSI_BLKSZ
u16 pwr_ctl = 0;
#endif
u16 cfg;
host = mmc_priv(mmc);

spin_lock_irqsave(&host->lock, flags);
if (ios->clock) {
unsigned long sys_clk, ios_clk;
unsigned char clk_div;
ios_clk = 2 * ios->clock;
sys_clk = get_sclk();
clk_div = sys_clk / ios_clk;
if (sys_clk % ios_clk == 0)
clk_div -= 1;
clk_div = min_t(unsigned char, clk_div, 0xFF);
clk_ctl |= clk_div;
clk_ctl |= CLK_E;
host->clk_div = clk_div;
} else
sdh_stop_clock(host);

if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
#ifdef CONFIG_SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
pwr_ctl |= ROD_CTL;
#else
pwr_ctl |= SD_CMD_OD | ROD_CTL;
#endif
spin_lock(&host->lock);

if (ios->bus_width == MMC_BUS_WIDTH_4) {
cfg = bfin_read_SDH_CFG();
cfg = bfin_read_SDH_CFG();
cfg |= MWE;
switch (ios->bus_width) {
case MMC_BUS_WIDTH_4:
#ifndef RSI_BLKSZ
cfg &= ~PD_SDDAT3;
#endif
cfg |= PUP_SDDAT3;
/* Enable 4 bit SDIO */
cfg |= (SD4E | MWE);
bfin_write_SDH_CFG(cfg);
clk_ctl |= WIDE_BUS;
} else {
cfg = bfin_read_SDH_CFG();
cfg |= MWE;
bfin_write_SDH_CFG(cfg);
cfg |= SD4E;
clk_ctl |= WIDE_BUS_4;
break;
case MMC_BUS_WIDTH_8:
#ifndef RSI_BLKSZ
cfg &= ~PD_SDDAT3;
#endif
cfg |= PUP_SDDAT3;
/* Disable 4 bit SDIO */
cfg &= ~SD4E;
clk_ctl |= BYTE_BUS_8;
break;
default:
cfg &= ~PUP_SDDAT3;
/* Disable 4 bit SDIO */
cfg &= ~SD4E;
}

bfin_write_SDH_CLK_CTL(clk_ctl);

host->power_mode = ios->power_mode;
if (ios->power_mode == MMC_POWER_ON)
#ifndef RSI_BLKSZ
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
pwr_ctl |= ROD_CTL;
# ifndef CONFIG_SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
pwr_ctl |= SD_CMD_OD;
# endif
}

if (ios->power_mode != MMC_POWER_OFF)
pwr_ctl |= PWR_ON;
else
pwr_ctl &= ~PWR_ON;

bfin_write_SDH_PWR_CTL(pwr_ctl);
#else
# ifndef CONFIG_SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
cfg |= SD_CMD_OD;
else
cfg &= ~SD_CMD_OD;
# endif


if (ios->power_mode != MMC_POWER_OFF)
cfg |= PWR_ON;
else
cfg &= ~PWR_ON;

bfin_write_SDH_CFG(cfg);
#endif
SSYNC();

spin_unlock_irqrestore(&host->lock, flags);
if (ios->power_mode == MMC_POWER_ON && ios->clock) {
unsigned char clk_div;
clk_div = (get_sclk() / ios->clock - 1) / 2;
clk_div = min_t(unsigned char, clk_div, 0xFF);
clk_ctl |= clk_div;
clk_ctl |= CLK_E;
host->clk_div = clk_div;
bfin_write_SDH_CLK_CTL(clk_ctl);

} else
sdh_stop_clock(host);

/* set up sdh interrupt mask*/
if (ios->power_mode == MMC_POWER_ON)
bfin_write_SDH_MASK0(DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL |
RX_OVERRUN | TX_UNDERRUN | CMD_SENT | CMD_RESP_END |
CMD_TIME_OUT | CMD_CRC_FAIL);
else
bfin_write_SDH_MASK0(0);
SSYNC();

spin_unlock(&host->lock);

dev_dbg(mmc_dev(host->mmc), "SDH: clk_div = 0x%x actual clock:%ld expected clock:%d\n",
host->clk_div,
Expand All @@ -405,7 +463,7 @@ static irqreturn_t sdh_dma_irq(int irq, void *devid)
{
struct sdh_host *host = devid;

dev_dbg(mmc_dev(host->mmc), "%s enter, irq_stat: 0x%04x\n", __func__,
dev_dbg(mmc_dev(host->mmc), "%s enter, irq_stat: 0x%04lx\n", __func__,
get_dma_curr_irqstat(host->dma_ch));
clear_dma_irqstat(host->dma_ch);
SSYNC();
Expand All @@ -420,6 +478,9 @@ static irqreturn_t sdh_stat_irq(int irq, void *devid)
int handled = 0;

dev_dbg(mmc_dev(host->mmc), "%s enter\n", __func__);

spin_lock(&host->lock);

status = bfin_read_SDH_E_STATUS();
if (status & SD_CARD_DET) {
mmc_detect_change(host->mmc, 0);
Expand All @@ -437,6 +498,8 @@ static irqreturn_t sdh_stat_irq(int irq, void *devid)
if (status & (DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN | TX_UNDERRUN))
handled |= sdh_data_done(host, status);

spin_unlock(&host->lock);

dev_dbg(mmc_dev(host->mmc), "%s exit\n\n", __func__);

return IRQ_RETVAL(handled);
Expand All @@ -462,12 +525,16 @@ static int __devinit sdh_probe(struct platform_device *pdev)
}

mmc->ops = &sdh_ops;
#if defined(CONFIG_BF54x)
mmc->max_segs = 32;
#elif defined(CONFIG_BF51x)
#if defined(CONFIG_BF51x)
mmc->max_segs = 1;
#else
mmc->max_segs = PAGE_SIZE / sizeof(struct dma_desc_array);
#endif
#ifdef RSI_BLKSZ
mmc->max_seg_size = -1;
#else
mmc->max_seg_size = 1 << 16;
#endif
mmc->max_blk_size = 1 << 11;
mmc->max_blk_count = 1 << 11;
mmc->max_req_size = PAGE_SIZE;
Expand All @@ -477,6 +544,7 @@ static int __devinit sdh_probe(struct platform_device *pdev)
mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_NEEDS_POLL;
host = mmc_priv(mmc);
host->mmc = mmc;
host->sclk = get_sclk();

spin_lock_init(&host->lock);
host->irq = drv_data->irq_int0;
Expand All @@ -501,7 +569,6 @@ static int __devinit sdh_probe(struct platform_device *pdev)
}

platform_set_drvdata(pdev, mmc);
mmc_add_host(mmc);

ret = request_irq(host->irq, sdh_stat_irq, 0, "SDH Status IRQ", host);
if (ret) {
Expand All @@ -522,12 +589,13 @@ static int __devinit sdh_probe(struct platform_device *pdev)
bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN);
SSYNC();

/* Disable card inserting detection pin. set MMC_CAP_NEES_POLL, and
/* Disable card inserting detection pin. set MMC_CAP_NEEDS_POLL, and
* mmc stack will do the detection.
*/
bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | (PUP_SDDAT | PUP_SDDAT3));
SSYNC();

mmc_add_host(mmc);
return 0;

out4:
Expand Down Expand Up @@ -575,7 +643,11 @@ static int sdh_suspend(struct platform_device *dev, pm_message_t state)
if (mmc)
ret = mmc_suspend_host(mmc);

#ifndef RSI_BLKSZ
bfin_write_SDH_PWR_CTL(bfin_read_SDH_PWR_CTL() & ~PWR_ON);
#else
bfin_write_SDH_CFG(bfin_read_SDH_CFG() & ~PWR_ON);
#endif
peripheral_free_list(drv_data->pin_req);

return ret;
Expand All @@ -593,12 +665,16 @@ static int sdh_resume(struct platform_device *dev)
return ret;
}

bfin_write_SDH_PWR_CTL(bfin_read_SDH_PWR_CTL() | PWR_ON);
#if defined(CONFIG_BF54x)
/* Secure Digital Host shares DMA with Nand controller */
bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1);
#endif
#ifndef RSI_BLKSZ
bfin_write_SDH_PWR_CTL(bfin_read_SDH_PWR_CTL() | PWR_ON);
bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN);
#else
bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN | PWR_ON);
#endif
SSYNC();

bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | (PUP_SDDAT | PUP_SDDAT3));
Expand Down

0 comments on commit 4ffdcf0

Please sign in to comment.