Documentation/devicetree/bindings/mmc/mtk-sd.txt | 2 +
arch/arm64/boot/dts/mediatek/mt8173-evb.dts | 77 ++++++++++
drivers/mmc/host/mtk-sd.c | 182 ++++++++++++++++++-----
3 files changed, 222 insertions(+), 39 deletions(-)
--
1.8.1.1.dirty
From: yong mao <[email protected]>
Add description for mediatek,clk-pad-delay
Signed-off-by: Yong Mao <[email protected]>
Signed-off-by: Chaotian Jing <[email protected]>
---
Documentation/devicetree/bindings/mmc/mtk-sd.txt | 2 ++
1 file changed, 2 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.txt b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
index 4182ea3..fbb3fd6 100644
--- a/Documentation/devicetree/bindings/mmc/mtk-sd.txt
+++ b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
@@ -30,6 +30,7 @@ Optional properties:
- mediatek,hs400-cmd-resp-sel-rising: HS400 command response sample selection
If present,HS400 command responses are sampled on rising edges.
If not present,HS400 command responses are sampled on falling edges.
+- mediatek,clk-pad-delay: clock pad delay setting
Examples:
mmc0: mmc@11230000 {
@@ -50,4 +51,5 @@ mmc0: mmc@11230000 {
mediatek,hs200-cmd-int-delay = <26>;
mediatek,hs400-cmd-int-delay = <14>;
mediatek,hs400-cmd-resp-sel-rising;
+ mediatek,clk-pad-delay = <5>;
};
--
1.7.9.5
From: yong mao <[email protected]>
1. Add irqlock to protect accessing the shared register
2. Implement enable_sdio_irq interface
3. Add msdc_recheck_sdio_irq mechanism to make sure all interrupts
can be processed immediately
Signed-off-by: Yong Mao <[email protected]>
Signed-off-by: Chaotian Jing <[email protected]>
---
drivers/mmc/host/mtk-sd.c | 182 +++++++++++++++++++++++++++++++++++----------
1 file changed, 143 insertions(+), 39 deletions(-)
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 07f3236..fdae197 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -118,6 +118,7 @@
#define MSDC_PS_CDSTS (0x1 << 1) /* R */
#define MSDC_PS_CDDEBOUNCE (0xf << 12) /* RW */
#define MSDC_PS_DAT (0xff << 16) /* R */
+#define MSDC_PS_DATA1 (0x1 << 17) /* R */
#define MSDC_PS_CMD (0x1 << 24) /* R */
#define MSDC_PS_WP (0x1 << 31) /* R */
@@ -312,6 +313,7 @@ struct msdc_host {
int cmd_rsp;
spinlock_t lock;
+ spinlock_t irqlock; /* irq lock */
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_data *data;
@@ -330,12 +332,14 @@ struct msdc_host {
struct pinctrl_state *pins_uhs;
struct delayed_work req_timeout;
int irq; /* host interrupt */
+ bool irq_thread_alive;
struct clk *src_clk; /* msdc source clock */
struct clk *h_clk; /* msdc h_clk */
u32 mclk; /* mmc subsystem clock frequency */
u32 src_clk_freq; /* source clock frequency */
u32 sclk; /* SD/MS bus clock frequency */
+ bool clock_on;
unsigned char timing;
bool vqmmc_enabled;
u32 hs400_ds_delay;
@@ -343,6 +347,7 @@ struct msdc_host {
u32 hs400_cmd_int_delay; /* cmd internal delay for HS400 */
bool hs400_cmd_resp_sel_rising;
/* cmd response sample selection for HS400 */
+ u32 clk_pad_delay;
bool hs400_mode; /* current eMMC will run at hs400 mode */
struct msdc_save_para save_para; /* used when gate HCLK */
struct msdc_tune_para def_tune_para; /* default tune setting */
@@ -399,6 +404,7 @@ static void msdc_reset_hw(struct msdc_host *host)
static void msdc_cmd_next(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd);
+static void msdc_recheck_sdio_irq(struct msdc_host *host);
static const u32 cmd_ints_mask = MSDC_INTEN_CMDRDY | MSDC_INTEN_RSPCRCERR |
MSDC_INTEN_CMDTMO | MSDC_INTEN_ACMDRDY |
@@ -525,6 +531,7 @@ static void msdc_gate_clock(struct msdc_host *host)
{
clk_disable_unprepare(host->src_clk);
clk_disable_unprepare(host->h_clk);
+ host->clock_on = false;
}
static void msdc_ungate_clock(struct msdc_host *host)
@@ -533,6 +540,7 @@ static void msdc_ungate_clock(struct msdc_host *host)
clk_prepare_enable(host->src_clk);
while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))
cpu_relax();
+ host->clock_on = true;
}
static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
@@ -541,6 +549,7 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
u32 flags;
u32 div;
u32 sclk;
+ unsigned long irq_flags;
if (!hz) {
dev_dbg(host->dev, "set mclk to 0\n");
@@ -549,8 +558,11 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
return;
}
+ spin_lock_irqsave(&host->irqlock, irq_flags);
flags = readl(host->base + MSDC_INTEN);
sdr_clr_bits(host->base + MSDC_INTEN, flags);
+ spin_unlock_irqrestore(&host->irqlock, irq_flags);
+
sdr_clr_bits(host->base + MSDC_CFG, MSDC_CFG_HS400_CK_MODE);
if (timing == MMC_TIMING_UHS_DDR50 ||
timing == MMC_TIMING_MMC_DDR52 ||
@@ -600,7 +612,10 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
host->timing = timing;
/* need because clk changed. */
msdc_set_timeout(host, host->timeout_ns, host->timeout_clks);
+
+ spin_lock_irqsave(&host->irqlock, irq_flags);
sdr_set_bits(host->base + MSDC_INTEN, flags);
+ spin_unlock_irqrestore(&host->irqlock, irq_flags);
/*
* mmc_select_hs400() will drop to 50Mhz and High speed mode,
@@ -708,6 +723,7 @@ static inline u32 msdc_cmd_prepare_raw_cmd(struct msdc_host *host,
static void msdc_start_data(struct msdc_host *host, struct mmc_request *mrq,
struct mmc_command *cmd, struct mmc_data *data)
{
+ unsigned long flags;
bool read;
WARN_ON(host->data);
@@ -716,8 +732,12 @@ static void msdc_start_data(struct msdc_host *host, struct mmc_request *mrq,
mod_delayed_work(system_wq, &host->req_timeout, DAT_TIMEOUT);
msdc_dma_setup(host, &host->dma, data);
+
+ spin_lock_irqsave(&host->irqlock, flags);
sdr_set_bits(host->base + MSDC_INTEN, data_ints_mask);
sdr_set_field(host->base + MSDC_DMA_CTRL, MSDC_DMA_CTRL_START, 1);
+ spin_unlock_irqrestore(&host->irqlock, flags);
+
dev_dbg(host->dev, "DMA start\n");
dev_dbg(host->dev, "%s: cmd=%d DMA data: %d blocks; read=%d\n",
__func__, cmd->opcode, data->blocks, read);
@@ -774,6 +794,8 @@ static void msdc_request_done(struct msdc_host *host, struct mmc_request *mrq)
if (mrq->data)
msdc_unprepare_data(host, mrq);
mmc_request_done(host->mmc, mrq);
+
+ msdc_recheck_sdio_irq(host);
}
/* returns true if command is fully handled; returns false otherwise */
@@ -797,15 +819,17 @@ static bool msdc_cmd_done(struct msdc_host *host, int events,
| MSDC_INT_CMDTMO)))
return done;
- spin_lock_irqsave(&host->lock, flags);
done = !host->cmd;
+ spin_lock_irqsave(&host->lock, flags);
host->cmd = NULL;
spin_unlock_irqrestore(&host->lock, flags);
if (done)
return true;
+ spin_lock_irqsave(&host->irqlock, flags);
sdr_clr_bits(host->base + MSDC_INTEN, cmd_ints_mask);
+ spin_unlock_irqrestore(&host->irqlock, flags);
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136) {
@@ -883,6 +907,7 @@ static inline bool msdc_cmd_is_ready(struct msdc_host *host,
static void msdc_start_command(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd)
{
+ unsigned long flags;
u32 rawcmd;
WARN_ON(host->cmd);
@@ -901,7 +926,10 @@ static void msdc_start_command(struct msdc_host *host,
rawcmd = msdc_cmd_prepare_raw_cmd(host, mrq, cmd);
mod_delayed_work(system_wq, &host->req_timeout, DAT_TIMEOUT);
+ spin_lock_irqsave(&host->irqlock, flags);
sdr_set_bits(host->base + MSDC_INTEN, cmd_ints_mask);
+ spin_unlock_irqrestore(&host->irqlock, flags);
+
writel(cmd->arg, host->base + SDC_ARG);
writel(rawcmd, host->base + SDC_CMD);
}
@@ -993,8 +1021,8 @@ static bool msdc_data_xfer_done(struct msdc_host *host, u32 events,
| MSDC_INT_DMA_BDCSERR | MSDC_INT_DMA_GPDCSERR
| MSDC_INT_DMA_PROTECT);
- spin_lock_irqsave(&host->lock, flags);
done = !host->data;
+ spin_lock_irqsave(&host->lock, flags);
if (check_data)
host->data = NULL;
spin_unlock_irqrestore(&host->lock, flags);
@@ -1009,7 +1037,11 @@ static bool msdc_data_xfer_done(struct msdc_host *host, u32 events,
1);
while (readl(host->base + MSDC_DMA_CFG) & MSDC_DMA_CFG_STS)
cpu_relax();
+
+ spin_lock_irqsave(&host->irqlock, flags);
sdr_clr_bits(host->base + MSDC_INTEN, data_ints_mask);
+ spin_unlock_irqrestore(&host->irqlock, flags);
+
dev_dbg(host->dev, "DMA stop\n");
if ((events & MSDC_INT_XFER_COMPL) && (!stop || !stop->error)) {
@@ -1123,44 +1155,47 @@ static void msdc_request_timeout(struct work_struct *work)
static irqreturn_t msdc_irq(int irq, void *dev_id)
{
+ unsigned long flags;
struct msdc_host *host = (struct msdc_host *) dev_id;
+ struct mmc_request *mrq;
+ struct mmc_command *cmd;
+ struct mmc_data *data;
+ u32 events, event_mask;
+
+ spin_lock_irqsave(&host->irqlock, flags);
+ events = readl(host->base + MSDC_INT);
+ event_mask = readl(host->base + MSDC_INTEN);
+ /* clear interrupts */
+ writel(events & event_mask, host->base + MSDC_INT);
+
+ mrq = host->mrq;
+ cmd = host->cmd;
+ data = host->data;
+ spin_unlock_irqrestore(&host->irqlock, flags);
+
+ if ((events & event_mask) & MSDC_INT_SDIOIRQ) {
+ mmc_signal_sdio_irq(host->mmc);
+ if (!mrq)
+ return IRQ_HANDLED;
+ }
- while (true) {
- unsigned long flags;
- struct mmc_request *mrq;
- struct mmc_command *cmd;
- struct mmc_data *data;
- u32 events, event_mask;
-
- spin_lock_irqsave(&host->lock, flags);
- events = readl(host->base + MSDC_INT);
- event_mask = readl(host->base + MSDC_INTEN);
- /* clear interrupts */
- writel(events & event_mask, host->base + MSDC_INT);
-
- mrq = host->mrq;
- cmd = host->cmd;
- data = host->data;
- spin_unlock_irqrestore(&host->lock, flags);
-
- if (!(events & event_mask))
- break;
+ if (!(events & (event_mask & ~MSDC_INT_SDIOIRQ)))
+ return IRQ_HANDLED;
- if (!mrq) {
- dev_err(host->dev,
- "%s: MRQ=NULL; events=%08X; event_mask=%08X\n",
- __func__, events, event_mask);
- WARN_ON(1);
- break;
- }
+ if (!mrq) {
+ dev_err(host->dev,
+ "%s: MRQ=NULL; events=%08X; event_mask=%08X\n",
+ __func__, events, event_mask);
+ WARN_ON(1);
+ return IRQ_HANDLED;
+ }
- dev_dbg(host->dev, "%s: events=%08X\n", __func__, events);
+ dev_dbg(host->dev, "%s: events=%08X\n", __func__, events);
- if (cmd)
- msdc_cmd_done(host, events, mrq, cmd);
- else if (data)
- msdc_data_xfer_done(host, events, mrq, data);
- }
+ if (cmd)
+ msdc_cmd_done(host, events, mrq, cmd);
+ else if (data)
+ msdc_data_xfer_done(host, events, mrq, data);
return IRQ_HANDLED;
}
@@ -1168,6 +1203,7 @@ static irqreturn_t msdc_irq(int irq, void *dev_id)
static void msdc_init_hw(struct msdc_host *host)
{
u32 val;
+ unsigned long flags;
/* Configure to MMC/SD mode, clock free running */
sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_MODE | MSDC_CFG_CKPDN);
@@ -1179,11 +1215,14 @@ static void msdc_init_hw(struct msdc_host *host)
sdr_clr_bits(host->base + MSDC_PS, MSDC_PS_CDEN);
/* Disable and clear all interrupts */
+ spin_lock_irqsave(&host->irqlock, flags);
writel(0, host->base + MSDC_INTEN);
val = readl(host->base + MSDC_INT);
writel(val, host->base + MSDC_INT);
+ spin_unlock_irqrestore(&host->irqlock, flags);
- writel(0, host->base + MSDC_PAD_TUNE);
+ sdr_set_field(host->base + MSDC_PAD_TUNE,
+ MSDC_PAD_TUNE_CLKTDLY, host->clk_pad_delay);
writel(0, host->base + MSDC_IOCON);
sdr_set_field(host->base + MSDC_IOCON, MSDC_IOCON_DDLSEL, 0);
writel(0x403c0046, host->base + MSDC_PATCH_BIT);
@@ -1196,9 +1235,11 @@ static void msdc_init_hw(struct msdc_host *host)
*/
sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIO);
- /* disable detect SDIO device interrupt function */
- sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
-
+ if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
+ sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
+ else
+ /* disable detect SDIO device interrupt function */
+ sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
/* Configure to default data timeout */
sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, 3);
@@ -1210,11 +1251,15 @@ static void msdc_init_hw(struct msdc_host *host)
static void msdc_deinit_hw(struct msdc_host *host)
{
u32 val;
+ unsigned long flags;
+
/* Disable and clear all interrupts */
+ spin_lock_irqsave(&host->irqlock, flags);
writel(0, host->base + MSDC_INTEN);
val = readl(host->base + MSDC_INT);
writel(val, host->base + MSDC_INT);
+ spin_unlock_irqrestore(&host->irqlock, flags);
}
/* init gpd and bd list in msdc_drv_probe */
@@ -1582,6 +1627,48 @@ static void msdc_hw_reset(struct mmc_host *mmc)
sdr_clr_bits(host->base + EMMC_IOCON, 1);
}
+/**
+ * msdc_recheck_sdio_irq - recheck whether the SDIO IRQ is lost
+ * @host: The host to check.
+ *
+ * Host controller may lost interrupt in some special case.
+ * Add sdio IRQ recheck mechanism to make sure all interrupts
+ * can be processed immediately
+ */
+static void msdc_recheck_sdio_irq(struct msdc_host *host)
+{
+ u32 reg_int, reg_ps;
+
+ if (host->clock_on && (host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
+ host->irq_thread_alive) {
+ reg_int = readl(host->base + MSDC_INT);
+ reg_ps = readl(host->base + MSDC_PS);
+ if (!((reg_int & MSDC_INT_SDIOIRQ) ||
+ (reg_ps & MSDC_PS_DATA1)))
+ mmc_signal_sdio_irq(host->mmc);
+ }
+}
+
+static void msdc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ unsigned long flags;
+ struct msdc_host *host = mmc_priv(mmc);
+
+ host->irq_thread_alive = true;
+ if (enable) {
+ msdc_recheck_sdio_irq(host);
+
+ spin_lock_irqsave(&host->irqlock, flags);
+ sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
+ sdr_set_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
+ spin_unlock_irqrestore(&host->irqlock, flags);
+ } else {
+ spin_lock_irqsave(&host->irqlock, flags);
+ sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
+ spin_unlock_irqrestore(&host->irqlock, flags);
+ }
+}
+
static struct mmc_host_ops mt_msdc_ops = {
.post_req = msdc_post_req,
.pre_req = msdc_pre_req,
@@ -1593,6 +1680,7 @@ static void msdc_hw_reset(struct mmc_host *mmc)
.execute_tuning = msdc_execute_tuning,
.prepare_hs400_tuning = msdc_prepare_hs400_tuning,
.hw_reset = msdc_hw_reset,
+ .enable_sdio_irq = msdc_enable_sdio_irq,
};
static void msdc_of_property_parse(struct platform_device *pdev,
@@ -1612,6 +1700,9 @@ static void msdc_of_property_parse(struct platform_device *pdev,
host->hs400_cmd_resp_sel_rising = true;
else
host->hs400_cmd_resp_sel_rising = false;
+
+ of_property_read_u32(pdev->dev.of_node, "mediatek,clk-pad-delay",
+ &host->clk_pad_delay);
}
static int msdc_drv_probe(struct platform_device *pdev)
@@ -1705,6 +1796,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
mmc_dev(mmc)->dma_mask = &host->dma_mask;
host->timeout_clks = 3 * 1048576;
+ host->irq_thread_alive = false;
host->dma.gpd = dma_alloc_coherent(&pdev->dev,
2 * sizeof(struct mt_gpdma_desc),
&host->dma.gpd_addr, GFP_KERNEL);
@@ -1718,6 +1810,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
msdc_init_gpd_bd(host, &host->dma);
INIT_DELAYED_WORK(&host->req_timeout, msdc_request_timeout);
spin_lock_init(&host->lock);
+ spin_lock_init(&host->irqlock);
platform_set_drvdata(pdev, mmc);
msdc_ungate_clock(host);
@@ -1732,6 +1825,10 @@ static int msdc_drv_probe(struct platform_device *pdev)
pm_runtime_set_autosuspend_delay(host->dev, MTK_MMC_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(host->dev);
pm_runtime_enable(host->dev);
+
+ /* In SDIO irq mode, DATA1 slways need to be detected */
+ if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
+ pm_runtime_get_sync(host->dev);
ret = mmc_add_host(mmc);
if (ret)
@@ -1821,6 +1918,10 @@ static int msdc_runtime_suspend(struct device *dev)
msdc_save_reg(host);
msdc_gate_clock(host);
+ if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+ }
return 0;
}
@@ -1829,6 +1930,9 @@ static int msdc_runtime_resume(struct device *dev)
struct mmc_host *mmc = dev_get_drvdata(dev);
struct msdc_host *host = mmc_priv(mmc);
+ /* In SDIO irq mode, DATA1 slways need to be detected */
+ if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
+ pm_runtime_get_sync(host->dev);
msdc_ungate_clock(host);
msdc_restore_reg(host);
return 0;
--
1.7.9.5
From: yong mao <[email protected]>
Add description of mmc3 for supporting sdio feature
Signed-off-by: Yong Mao <[email protected]>
Signed-off-by: Chaotian Jing <[email protected]>
---
arch/arm64/boot/dts/mediatek/mt8173-evb.dts | 77 +++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
diff --git a/arch/arm64/boot/dts/mediatek/mt8173-evb.dts b/arch/arm64/boot/dts/mediatek/mt8173-evb.dts
index 1c3634f..fb8fa5c 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173-evb.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8173-evb.dts
@@ -68,6 +68,14 @@
gpio = <&pio 9 GPIO_ACTIVE_HIGH>;
enable-active-high;
};
+
+ sdio_fixed_3v3: regulator@2 {
+ compatible = "regulator-fixed";
+ regulator-name = "3V3";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ gpio = <&pio 85 GPIO_ACTIVE_HIGH>;
+ };
};
&cec {
@@ -156,6 +164,25 @@
vqmmc-supply = <&mt6397_vmc_reg>;
};
+&mmc3 {
+ status = "okay";
+ pinctrl-names = "default", "state_uhs";
+ pinctrl-0 = <&mmc3_pins_default>;
+ pinctrl-1 = <&mmc3_pins_uhs>;
+ bus-width = <4>;
+ max-frequency = <200000000>;
+ cap-sd-highspeed;
+ sd-uhs-sdr50;
+ sd-uhs-sdr104;
+ mediatek,clk-pad-delay = <5>;
+ keep-power-in-suspend;
+ enable-sdio-wakeup;
+ cap-sdio-irq;
+ vmmc-supply = <&sdio_fixed_3v3>;
+ vqmmc-supply = <&mt6397_vgp3_reg>;
+ non-removable;
+};
+
&pio {
disp_pwm0_pins: disp_pwm0_pins {
pins1 {
@@ -261,6 +288,56 @@
};
};
+ mmc3_pins_default: mmc3default {
+ pins_dat {
+ pinmux = <MT8173_PIN_22_MSDC3_DAT0__FUNC_MSDC3_DAT0>,
+ <MT8173_PIN_23_MSDC3_DAT1__FUNC_MSDC3_DAT1>,
+ <MT8173_PIN_24_MSDC3_DAT2__FUNC_MSDC3_DAT2>,
+ <MT8173_PIN_25_MSDC3_DAT3__FUNC_MSDC3_DAT3>;
+ input-enable;
+ drive-strength = <MTK_DRIVE_8mA>;
+ bias-pull-up = <MTK_PUPD_SET_R1R0_10>;
+ };
+
+ pins_cmd {
+ pinmux = <MT8173_PIN_27_MSDC3_CMD__FUNC_MSDC3_CMD>;
+ input-enable;
+ drive-strength = <MTK_DRIVE_8mA>;
+ bias-pull-up = <MTK_PUPD_SET_R1R0_10>;
+ };
+
+ pins_clk {
+ pinmux = <MT8173_PIN_26_MSDC3_CLK__FUNC_MSDC3_CLK>;
+ bias-pull-down;
+ drive-strength = <MTK_DRIVE_8mA>;
+ };
+ };
+
+ mmc3_pins_uhs: mmc3 {
+ pins_dat {
+ pinmux = <MT8173_PIN_22_MSDC3_DAT0__FUNC_MSDC3_DAT0>,
+ <MT8173_PIN_23_MSDC3_DAT1__FUNC_MSDC3_DAT1>,
+ <MT8173_PIN_24_MSDC3_DAT2__FUNC_MSDC3_DAT2>,
+ <MT8173_PIN_25_MSDC3_DAT3__FUNC_MSDC3_DAT3>;
+ input-enable;
+ drive-strength = <MTK_DRIVE_8mA>;
+ bias-pull-up = <MTK_PUPD_SET_R1R0_10>;
+ };
+
+ pins_cmd {
+ pinmux = <MT8173_PIN_27_MSDC3_CMD__FUNC_MSDC3_CMD>;
+ input-enable;
+ drive-strength = <MTK_DRIVE_8mA>;
+ bias-pull-up = <MTK_PUPD_SET_R1R0_10>;
+ };
+
+ pins_clk {
+ pinmux = <MT8173_PIN_26_MSDC3_CLK__FUNC_MSDC3_CLK>;
+ drive-strength = <MTK_DRIVE_8mA>;
+ bias-pull-down = <MTK_PUPD_SET_R1R0_10>;
+ };
+ };
+
usb_id_pins_float: usb_iddig_pull_up {
pins_iddig {
pinmux = <MT8173_PIN_16_IDDIG__FUNC_IDDIG>;
--
1.7.9.5
On 18 April 2017 at 12:13, Yong Mao <[email protected]> wrote:
> From: yong mao <[email protected]>
>
> 1. Add irqlock to protect accessing the shared register
> 2. Implement enable_sdio_irq interface
> 3. Add msdc_recheck_sdio_irq mechanism to make sure all interrupts
> can be processed immediately
I think this should be split up in more pieces. Perhaps three as the
changelog describes.
Moreover I would appreciate some more information about why/how.
>
> Signed-off-by: Yong Mao <[email protected]>
> Signed-off-by: Chaotian Jing <[email protected]>
> ---
> drivers/mmc/host/mtk-sd.c | 182 +++++++++++++++++++++++++++++++++++----------
> 1 file changed, 143 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 07f3236..fdae197 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -118,6 +118,7 @@
> #define MSDC_PS_CDSTS (0x1 << 1) /* R */
> #define MSDC_PS_CDDEBOUNCE (0xf << 12) /* RW */
> #define MSDC_PS_DAT (0xff << 16) /* R */
> +#define MSDC_PS_DATA1 (0x1 << 17) /* R */
> #define MSDC_PS_CMD (0x1 << 24) /* R */
> #define MSDC_PS_WP (0x1 << 31) /* R */
>
> @@ -312,6 +313,7 @@ struct msdc_host {
> int cmd_rsp;
>
> spinlock_t lock;
> + spinlock_t irqlock; /* irq lock */
> struct mmc_request *mrq;
> struct mmc_command *cmd;
> struct mmc_data *data;
> @@ -330,12 +332,14 @@ struct msdc_host {
> struct pinctrl_state *pins_uhs;
> struct delayed_work req_timeout;
> int irq; /* host interrupt */
> + bool irq_thread_alive;
>
> struct clk *src_clk; /* msdc source clock */
> struct clk *h_clk; /* msdc h_clk */
> u32 mclk; /* mmc subsystem clock frequency */
> u32 src_clk_freq; /* source clock frequency */
> u32 sclk; /* SD/MS bus clock frequency */
> + bool clock_on;
> unsigned char timing;
> bool vqmmc_enabled;
> u32 hs400_ds_delay;
> @@ -343,6 +347,7 @@ struct msdc_host {
> u32 hs400_cmd_int_delay; /* cmd internal delay for HS400 */
> bool hs400_cmd_resp_sel_rising;
> /* cmd response sample selection for HS400 */
> + u32 clk_pad_delay;
Parsing and using of pad_delay seems like it also should be a separate change.
> bool hs400_mode; /* current eMMC will run at hs400 mode */
> struct msdc_save_para save_para; /* used when gate HCLK */
> struct msdc_tune_para def_tune_para; /* default tune setting */
> @@ -399,6 +404,7 @@ static void msdc_reset_hw(struct msdc_host *host)
>
> static void msdc_cmd_next(struct msdc_host *host,
> struct mmc_request *mrq, struct mmc_command *cmd);
> +static void msdc_recheck_sdio_irq(struct msdc_host *host);
>
> static const u32 cmd_ints_mask = MSDC_INTEN_CMDRDY | MSDC_INTEN_RSPCRCERR |
> MSDC_INTEN_CMDTMO | MSDC_INTEN_ACMDRDY |
> @@ -525,6 +531,7 @@ static void msdc_gate_clock(struct msdc_host *host)
> {
> clk_disable_unprepare(host->src_clk);
> clk_disable_unprepare(host->h_clk);
> + host->clock_on = false;
This looks weird. Why do you need to keep track of this?
> }
>
> static void msdc_ungate_clock(struct msdc_host *host)
> @@ -533,6 +540,7 @@ static void msdc_ungate_clock(struct msdc_host *host)
> clk_prepare_enable(host->src_clk);
> while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))
> cpu_relax();
> + host->clock_on = true;
Ditto.
> }
>
> static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
> @@ -541,6 +549,7 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
> u32 flags;
> u32 div;
> u32 sclk;
> + unsigned long irq_flags;
>
> if (!hz) {
> dev_dbg(host->dev, "set mclk to 0\n");
> @@ -549,8 +558,11 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
> return;
> }
>
> + spin_lock_irqsave(&host->irqlock, irq_flags);
Why is the spin_lock needed now, and not before. Could you elaborate on that?
No matter what, seems like it should be separate change.
> flags = readl(host->base + MSDC_INTEN);
> sdr_clr_bits(host->base + MSDC_INTEN, flags);
> + spin_unlock_irqrestore(&host->irqlock, irq_flags);
> +
> sdr_clr_bits(host->base + MSDC_CFG, MSDC_CFG_HS400_CK_MODE);
> if (timing == MMC_TIMING_UHS_DDR50 ||
> timing == MMC_TIMING_MMC_DDR52 ||
> @@ -600,7 +612,10 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
> host->timing = timing;
> /* need because clk changed. */
> msdc_set_timeout(host, host->timeout_ns, host->timeout_clks);
> +
> + spin_lock_irqsave(&host->irqlock, irq_flags);
> sdr_set_bits(host->base + MSDC_INTEN, flags);
> + spin_unlock_irqrestore(&host->irqlock, irq_flags);
>
> /*
> * mmc_select_hs400() will drop to 50Mhz and High speed mode,
> @@ -708,6 +723,7 @@ static inline u32 msdc_cmd_prepare_raw_cmd(struct msdc_host *host,
> static void msdc_start_data(struct msdc_host *host, struct mmc_request *mrq,
> struct mmc_command *cmd, struct mmc_data *data)
> {
> + unsigned long flags;
> bool read;
>
> WARN_ON(host->data);
> @@ -716,8 +732,12 @@ static void msdc_start_data(struct msdc_host *host, struct mmc_request *mrq,
>
> mod_delayed_work(system_wq, &host->req_timeout, DAT_TIMEOUT);
> msdc_dma_setup(host, &host->dma, data);
> +
> + spin_lock_irqsave(&host->irqlock, flags);
> sdr_set_bits(host->base + MSDC_INTEN, data_ints_mask);
> sdr_set_field(host->base + MSDC_DMA_CTRL, MSDC_DMA_CTRL_START, 1);
> + spin_unlock_irqrestore(&host->irqlock, flags);
> +
> dev_dbg(host->dev, "DMA start\n");
> dev_dbg(host->dev, "%s: cmd=%d DMA data: %d blocks; read=%d\n",
> __func__, cmd->opcode, data->blocks, read);
> @@ -774,6 +794,8 @@ static void msdc_request_done(struct msdc_host *host, struct mmc_request *mrq)
> if (mrq->data)
> msdc_unprepare_data(host, mrq);
> mmc_request_done(host->mmc, mrq);
> +
> + msdc_recheck_sdio_irq(host);
This I don't get. Why checking for SDIO IRQ here? Is it like an
optimization thing or?
> }
>
> /* returns true if command is fully handled; returns false otherwise */
> @@ -797,15 +819,17 @@ static bool msdc_cmd_done(struct msdc_host *host, int events,
> | MSDC_INT_CMDTMO)))
> return done;
>
> - spin_lock_irqsave(&host->lock, flags);
> done = !host->cmd;
> + spin_lock_irqsave(&host->lock, flags);
> host->cmd = NULL;
> spin_unlock_irqrestore(&host->lock, flags);
>
> if (done)
> return true;
>
> + spin_lock_irqsave(&host->irqlock, flags);
> sdr_clr_bits(host->base + MSDC_INTEN, cmd_ints_mask);
> + spin_unlock_irqrestore(&host->irqlock, flags);
>
> if (cmd->flags & MMC_RSP_PRESENT) {
> if (cmd->flags & MMC_RSP_136) {
> @@ -883,6 +907,7 @@ static inline bool msdc_cmd_is_ready(struct msdc_host *host,
> static void msdc_start_command(struct msdc_host *host,
> struct mmc_request *mrq, struct mmc_command *cmd)
> {
> + unsigned long flags;
> u32 rawcmd;
>
> WARN_ON(host->cmd);
> @@ -901,7 +926,10 @@ static void msdc_start_command(struct msdc_host *host,
> rawcmd = msdc_cmd_prepare_raw_cmd(host, mrq, cmd);
> mod_delayed_work(system_wq, &host->req_timeout, DAT_TIMEOUT);
>
> + spin_lock_irqsave(&host->irqlock, flags);
> sdr_set_bits(host->base + MSDC_INTEN, cmd_ints_mask);
> + spin_unlock_irqrestore(&host->irqlock, flags);
> +
> writel(cmd->arg, host->base + SDC_ARG);
> writel(rawcmd, host->base + SDC_CMD);
> }
> @@ -993,8 +1021,8 @@ static bool msdc_data_xfer_done(struct msdc_host *host, u32 events,
> | MSDC_INT_DMA_BDCSERR | MSDC_INT_DMA_GPDCSERR
> | MSDC_INT_DMA_PROTECT);
>
> - spin_lock_irqsave(&host->lock, flags);
> done = !host->data;
> + spin_lock_irqsave(&host->lock, flags);
> if (check_data)
> host->data = NULL;
> spin_unlock_irqrestore(&host->lock, flags);
> @@ -1009,7 +1037,11 @@ static bool msdc_data_xfer_done(struct msdc_host *host, u32 events,
> 1);
> while (readl(host->base + MSDC_DMA_CFG) & MSDC_DMA_CFG_STS)
> cpu_relax();
> +
> + spin_lock_irqsave(&host->irqlock, flags);
> sdr_clr_bits(host->base + MSDC_INTEN, data_ints_mask);
> + spin_unlock_irqrestore(&host->irqlock, flags);
> +
> dev_dbg(host->dev, "DMA stop\n");
>
> if ((events & MSDC_INT_XFER_COMPL) && (!stop || !stop->error)) {
> @@ -1123,44 +1155,47 @@ static void msdc_request_timeout(struct work_struct *work)
>
> static irqreturn_t msdc_irq(int irq, void *dev_id)
> {
> + unsigned long flags;
> struct msdc_host *host = (struct msdc_host *) dev_id;
> + struct mmc_request *mrq;
> + struct mmc_command *cmd;
> + struct mmc_data *data;
> + u32 events, event_mask;
> +
> + spin_lock_irqsave(&host->irqlock, flags);
> + events = readl(host->base + MSDC_INT);
> + event_mask = readl(host->base + MSDC_INTEN);
> + /* clear interrupts */
> + writel(events & event_mask, host->base + MSDC_INT);
> +
> + mrq = host->mrq;
> + cmd = host->cmd;
> + data = host->data;
> + spin_unlock_irqrestore(&host->irqlock, flags);
> +
> + if ((events & event_mask) & MSDC_INT_SDIOIRQ) {
> + mmc_signal_sdio_irq(host->mmc);
> + if (!mrq)
> + return IRQ_HANDLED;
> + }
>
> - while (true) {
> - unsigned long flags;
> - struct mmc_request *mrq;
> - struct mmc_command *cmd;
> - struct mmc_data *data;
> - u32 events, event_mask;
> -
> - spin_lock_irqsave(&host->lock, flags);
> - events = readl(host->base + MSDC_INT);
> - event_mask = readl(host->base + MSDC_INTEN);
> - /* clear interrupts */
> - writel(events & event_mask, host->base + MSDC_INT);
> -
> - mrq = host->mrq;
> - cmd = host->cmd;
> - data = host->data;
> - spin_unlock_irqrestore(&host->lock, flags);
> -
> - if (!(events & event_mask))
> - break;
> + if (!(events & (event_mask & ~MSDC_INT_SDIOIRQ)))
> + return IRQ_HANDLED;
>
> - if (!mrq) {
> - dev_err(host->dev,
> - "%s: MRQ=NULL; events=%08X; event_mask=%08X\n",
> - __func__, events, event_mask);
> - WARN_ON(1);
> - break;
> - }
> + if (!mrq) {
> + dev_err(host->dev,
> + "%s: MRQ=NULL; events=%08X; event_mask=%08X\n",
> + __func__, events, event_mask);
> + WARN_ON(1);
> + return IRQ_HANDLED;
> + }
>
> - dev_dbg(host->dev, "%s: events=%08X\n", __func__, events);
> + dev_dbg(host->dev, "%s: events=%08X\n", __func__, events);
>
> - if (cmd)
> - msdc_cmd_done(host, events, mrq, cmd);
> - else if (data)
> - msdc_data_xfer_done(host, events, mrq, data);
> - }
> + if (cmd)
> + msdc_cmd_done(host, events, mrq, cmd);
> + else if (data)
> + msdc_data_xfer_done(host, events, mrq, data);
>
> return IRQ_HANDLED;
> }
> @@ -1168,6 +1203,7 @@ static irqreturn_t msdc_irq(int irq, void *dev_id)
> static void msdc_init_hw(struct msdc_host *host)
> {
> u32 val;
> + unsigned long flags;
>
> /* Configure to MMC/SD mode, clock free running */
> sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_MODE | MSDC_CFG_CKPDN);
> @@ -1179,11 +1215,14 @@ static void msdc_init_hw(struct msdc_host *host)
> sdr_clr_bits(host->base + MSDC_PS, MSDC_PS_CDEN);
>
> /* Disable and clear all interrupts */
> + spin_lock_irqsave(&host->irqlock, flags);
> writel(0, host->base + MSDC_INTEN);
> val = readl(host->base + MSDC_INT);
> writel(val, host->base + MSDC_INT);
> + spin_unlock_irqrestore(&host->irqlock, flags);
>
> - writel(0, host->base + MSDC_PAD_TUNE);
> + sdr_set_field(host->base + MSDC_PAD_TUNE,
> + MSDC_PAD_TUNE_CLKTDLY, host->clk_pad_delay);
> writel(0, host->base + MSDC_IOCON);
> sdr_set_field(host->base + MSDC_IOCON, MSDC_IOCON_DDLSEL, 0);
> writel(0x403c0046, host->base + MSDC_PATCH_BIT);
> @@ -1196,9 +1235,11 @@ static void msdc_init_hw(struct msdc_host *host)
> */
> sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIO);
>
> - /* disable detect SDIO device interrupt function */
> - sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> -
> + if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
> + sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> + else
> + /* disable detect SDIO device interrupt function */
> + sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> /* Configure to default data timeout */
> sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, 3);
>
> @@ -1210,11 +1251,15 @@ static void msdc_init_hw(struct msdc_host *host)
> static void msdc_deinit_hw(struct msdc_host *host)
> {
> u32 val;
> + unsigned long flags;
> +
> /* Disable and clear all interrupts */
> + spin_lock_irqsave(&host->irqlock, flags);
> writel(0, host->base + MSDC_INTEN);
>
> val = readl(host->base + MSDC_INT);
> writel(val, host->base + MSDC_INT);
> + spin_unlock_irqrestore(&host->irqlock, flags);
> }
>
> /* init gpd and bd list in msdc_drv_probe */
> @@ -1582,6 +1627,48 @@ static void msdc_hw_reset(struct mmc_host *mmc)
> sdr_clr_bits(host->base + EMMC_IOCON, 1);
> }
>
> +/**
> + * msdc_recheck_sdio_irq - recheck whether the SDIO IRQ is lost
> + * @host: The host to check.
> + *
> + * Host controller may lost interrupt in some special case.
> + * Add sdio IRQ recheck mechanism to make sure all interrupts
> + * can be processed immediately
> + */
> +static void msdc_recheck_sdio_irq(struct msdc_host *host)
> +{
> + u32 reg_int, reg_ps;
> +
> + if (host->clock_on && (host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
> + host->irq_thread_alive) {
> + reg_int = readl(host->base + MSDC_INT);
> + reg_ps = readl(host->base + MSDC_PS);
> + if (!((reg_int & MSDC_INT_SDIOIRQ) ||
> + (reg_ps & MSDC_PS_DATA1)))
> + mmc_signal_sdio_irq(host->mmc);
> + }
> +}
> +
> +static void msdc_enable_sdio_irq(struct mmc_host *mmc, int enable)
> +{
> + unsigned long flags;
> + struct msdc_host *host = mmc_priv(mmc);
> +
> + host->irq_thread_alive = true;
> + if (enable) {
> + msdc_recheck_sdio_irq(host);
> +
> + spin_lock_irqsave(&host->irqlock, flags);
> + sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> + sdr_set_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
> + spin_unlock_irqrestore(&host->irqlock, flags);
> + } else {
> + spin_lock_irqsave(&host->irqlock, flags);
> + sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
> + spin_unlock_irqrestore(&host->irqlock, flags);
> + }
> +}
> +
> static struct mmc_host_ops mt_msdc_ops = {
> .post_req = msdc_post_req,
> .pre_req = msdc_pre_req,
> @@ -1593,6 +1680,7 @@ static void msdc_hw_reset(struct mmc_host *mmc)
> .execute_tuning = msdc_execute_tuning,
> .prepare_hs400_tuning = msdc_prepare_hs400_tuning,
> .hw_reset = msdc_hw_reset,
> + .enable_sdio_irq = msdc_enable_sdio_irq,
> };
>
> static void msdc_of_property_parse(struct platform_device *pdev,
> @@ -1612,6 +1700,9 @@ static void msdc_of_property_parse(struct platform_device *pdev,
> host->hs400_cmd_resp_sel_rising = true;
> else
> host->hs400_cmd_resp_sel_rising = false;
> +
> + of_property_read_u32(pdev->dev.of_node, "mediatek,clk-pad-delay",
> + &host->clk_pad_delay);
> }
>
> static int msdc_drv_probe(struct platform_device *pdev)
> @@ -1705,6 +1796,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
> mmc_dev(mmc)->dma_mask = &host->dma_mask;
>
> host->timeout_clks = 3 * 1048576;
> + host->irq_thread_alive = false;
> host->dma.gpd = dma_alloc_coherent(&pdev->dev,
> 2 * sizeof(struct mt_gpdma_desc),
> &host->dma.gpd_addr, GFP_KERNEL);
> @@ -1718,6 +1810,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
> msdc_init_gpd_bd(host, &host->dma);
> INIT_DELAYED_WORK(&host->req_timeout, msdc_request_timeout);
> spin_lock_init(&host->lock);
> + spin_lock_init(&host->irqlock);
I don't get why the host->lock can't be used here? Why do you need a new one?
>
> platform_set_drvdata(pdev, mmc);
> msdc_ungate_clock(host);
> @@ -1732,6 +1825,10 @@ static int msdc_drv_probe(struct platform_device *pdev)
> pm_runtime_set_autosuspend_delay(host->dev, MTK_MMC_AUTOSUSPEND_DELAY);
> pm_runtime_use_autosuspend(host->dev);
> pm_runtime_enable(host->dev);
> +
> + /* In SDIO irq mode, DATA1 slways need to be detected */
> + if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
> + pm_runtime_get_sync(host->dev);
This seems reasonable, however I think we can make this more fine grained.
It is actually not until there is a SDIO func driver that has claimed
an SDIO IRQ, to when you need to make sure to keep the host runtime PM
resumed.
Please look into the following series [1], which I recently posted and
try to see if using MMC_CAP2_SDIO_IRQ_NOTHREAD can suite you. In
principle I think $subject patch can be greatly simplified if you
convert to MMC_CAP2_SDIO_IRQ_NOTHREAD.
> ret = mmc_add_host(mmc);
>
> if (ret)
> @@ -1821,6 +1918,10 @@ static int msdc_runtime_suspend(struct device *dev)
>
> msdc_save_reg(host);
> msdc_gate_clock(host);
> + if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
> + pm_runtime_mark_last_busy(dev);
> + pm_runtime_put_autosuspend(dev);
> + }
> return 0;
> }
>
> @@ -1829,6 +1930,9 @@ static int msdc_runtime_resume(struct device *dev)
> struct mmc_host *mmc = dev_get_drvdata(dev);
> struct msdc_host *host = mmc_priv(mmc);
>
> + /* In SDIO irq mode, DATA1 slways need to be detected */
> + if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
> + pm_runtime_get_sync(host->dev);
> msdc_ungate_clock(host);
> msdc_restore_reg(host);
> return 0;
> --
> 1.7.9.5
>
Kind regards
Uffe
[1]
https://www.spinics.net/lists/linux-mmc/msg43763.html
On Tue, Apr 18, 2017 at 06:13:09PM +0800, Yong Mao wrote:
> From: yong mao <[email protected]>
>
> Add description for mediatek,clk-pad-delay
>
> Signed-off-by: Yong Mao <[email protected]>
> Signed-off-by: Chaotian Jing <[email protected]>
> ---
> Documentation/devicetree/bindings/mmc/mtk-sd.txt | 2 ++
> 1 file changed, 2 insertions(+)
Acked-by: Rob Herring <[email protected]>