mmc: bfin_sdh: Add support for new RSI controller in bf60x

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>

1 files changed, 128 insertions, 52 deletions

diff --git a/drivers/mmc/host/bfin_sdh.c b/drivers/mmc/host/bfin_sdh.c
index 56a10938b44a..f47526f09271 100644
--- a/drivers/mmc/host/bfin_sdh.c
+++ b/drivers/mmc/host/bfin_sdh.c
@@ -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
@@ -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 {
@@ -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;
@@ -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);
@@ -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;
@@ -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);
@@ -172,6 +188,7 @@ 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 */
@@ -179,6 +196,7 @@ static int sdh_setup_data(struct sdh_host *host, struct mmc_data *data)
         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);
@@ -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);
@@ -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,
@@ -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();
@@ -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);
@@ -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);
@@ -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;
@@ -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;
@@ -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) {
@@ -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:
@@ -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;
@@ -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));