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Message-ID: <20230901120836.1057900-1-yann.gautier@foss.st.com>
Date: Fri, 1 Sep 2023 14:08:36 +0200
From: Yann Gautier <yann.gautier@...s.st.com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
Russell King <linux@...linux.org.uk>
CC: Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Linus Walleij <linus.walleij@...aro.org>,
Christophe Kerello <christophe.kerello@...s.st.com>,
Yang Yingliang <yangyingliang@...wei.com>,
Rob Herring <robh@...nel.org>, <linux-mmc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>,
<linux-arm-kernel@...ts.infradead.org>,
Yann Gautier <yann.gautier@...s.st.com>
Subject: [PATCH] mmc: mmci: stm32: add SDIO in-band interrupt mode
From: Christophe Kerello <christophe.kerello@...s.st.com>
Add the support of SDIO in-band interrupt mode for STM32 variant.
It allows the SD I/O card to interrupt the host on SDMMC_D1 data line.
Signed-off-by: Christophe Kerello <christophe.kerello@...s.st.com>
Signed-off-by: Yann Gautier <yann.gautier@...s.st.com>
---
drivers/mmc/host/mmci.c | 61 +++++++++++++++++++++++++++++
drivers/mmc/host/mmci.h | 4 ++
drivers/mmc/host/mmci_stm32_sdmmc.c | 21 ++++++++++
3 files changed, 86 insertions(+)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index dda756a563793..c4d3ffc5340f7 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -272,6 +272,7 @@ static struct variant_data variant_stm32_sdmmc = {
.datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
.stm32_idmabsize_mask = GENMASK(12, 5),
.stm32_idmabsize_align = BIT(5),
+ .use_sdio_irq = true,
.busy_timeout = true,
.busy_detect = true,
.busy_detect_flag = MCI_STM32_BUSYD0,
@@ -299,6 +300,7 @@ static struct variant_data variant_stm32_sdmmcv2 = {
.datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
.stm32_idmabsize_mask = GENMASK(16, 5),
.stm32_idmabsize_align = BIT(5),
+ .use_sdio_irq = true,
.dma_lli = true,
.busy_timeout = true,
.busy_detect = true,
@@ -327,6 +329,7 @@ static struct variant_data variant_stm32_sdmmcv3 = {
.datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
.stm32_idmabsize_mask = GENMASK(16, 6),
.stm32_idmabsize_align = BIT(6),
+ .use_sdio_irq = true,
.dma_lli = true,
.busy_timeout = true,
.busy_detect = true,
@@ -423,6 +426,10 @@ static void mmci_write_datactrlreg(struct mmci_host *host, u32 datactrl)
/* Keep busy mode in DPSM if enabled */
datactrl |= host->datactrl_reg & host->variant->busy_dpsm_flag;
+ /* Keep SD I/O interrupt mode enabled */
+ if (host->variant->use_sdio_irq && host->mmc->caps & MMC_CAP_SDIO_IRQ)
+ datactrl |= host->variant->datactrl_mask_sdio;
+
if (host->datactrl_reg != datactrl) {
host->datactrl_reg = datactrl;
writel(datactrl, host->base + MMCIDATACTRL);
@@ -1805,6 +1812,11 @@ static irqreturn_t mmci_irq(int irq, void *dev_id)
mmci_data_irq(host, host->data, status);
}
+ if (host->variant->use_sdio_irq &&
+ host->mmc->caps & MMC_CAP_SDIO_IRQ &&
+ host->ops && host->ops->sdio_irq)
+ host->ops->sdio_irq(host, status);
+
/*
* Busy detection has been handled by mmci_cmd_irq() above.
* Clear the status bit to prevent polling in IRQ context.
@@ -2041,6 +2053,45 @@ static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
return ret;
}
+static void mmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ unsigned long flags;
+
+ if (!host->variant->use_sdio_irq)
+ return;
+
+ if (host->ops && host->ops->enable_sdio_irq) {
+ if (enable)
+ /* Keep device active while SDIO IRQ is enabled */
+ pm_runtime_get_sync(mmc_dev(mmc));
+
+ spin_lock_irqsave(&host->lock, flags);
+ host->ops->enable_sdio_irq(host, enable);
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ if (!enable) {
+ pm_runtime_mark_last_busy(mmc_dev(mmc));
+ pm_runtime_put_autosuspend(mmc_dev(mmc));
+ }
+ }
+}
+
+static void mmci_ack_sdio_irq(struct mmc_host *mmc)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ unsigned long flags;
+
+ if (!host->variant->use_sdio_irq)
+ return;
+
+ if (host->ops && host->ops->enable_sdio_irq) {
+ spin_lock_irqsave(&host->lock, flags);
+ host->ops->enable_sdio_irq(host, 1);
+ spin_unlock_irqrestore(&host->lock, flags);
+ }
+}
+
static struct mmc_host_ops mmci_ops = {
.request = mmci_request,
.pre_req = mmci_pre_request,
@@ -2049,6 +2100,8 @@ static struct mmc_host_ops mmci_ops = {
.get_ro = mmc_gpio_get_ro,
.get_cd = mmci_get_cd,
.start_signal_voltage_switch = mmci_sig_volt_switch,
+ .enable_sdio_irq = mmci_enable_sdio_irq,
+ .ack_sdio_irq = mmci_ack_sdio_irq,
};
static void mmci_probe_level_translator(struct mmc_host *mmc)
@@ -2316,6 +2369,14 @@ static int mmci_probe(struct amba_device *dev,
mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
}
+ if (variant->use_sdio_irq && host->mmc->caps & MMC_CAP_SDIO_IRQ) {
+ mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
+
+ if (variant->datactrl_mask_sdio)
+ mmci_write_datactrlreg(host,
+ host->variant->datactrl_mask_sdio);
+ }
+
/* Variants with mandatory busy timeout in HW needs R1B responses. */
if (variant->busy_timeout)
mmc->caps |= MMC_CAP_NEED_RSP_BUSY;
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 253197f132fca..554473c01b8af 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -332,6 +332,7 @@ enum mmci_busy_state {
* @opendrain: bitmask identifying the OPENDRAIN bit inside MMCIPOWER register
* @dma_lli: true if variant has dma link list feature.
* @stm32_idmabsize_mask: stm32 sdmmc idma buffer size.
+ * @use_sdio_irq: allow SD I/O card to interrupt the host
*/
struct variant_data {
unsigned int clkreg;
@@ -376,6 +377,7 @@ struct variant_data {
u32 start_err;
u32 opendrain;
u8 dma_lli:1;
+ u8 use_sdio_irq:1;
u32 stm32_idmabsize_mask;
u32 stm32_idmabsize_align;
void (*init)(struct mmci_host *host);
@@ -400,6 +402,8 @@ struct mmci_host_ops {
bool (*busy_complete)(struct mmci_host *host, struct mmc_command *cmd, u32 status, u32 err_msk);
void (*pre_sig_volt_switch)(struct mmci_host *host);
int (*post_sig_volt_switch)(struct mmci_host *host, struct mmc_ios *ios);
+ void (*enable_sdio_irq)(struct mmci_host *host, int enable);
+ void (*sdio_irq)(struct mmci_host *host, u32 status);
};
struct mmci_host {
diff --git a/drivers/mmc/host/mmci_stm32_sdmmc.c b/drivers/mmc/host/mmci_stm32_sdmmc.c
index 35067e1e6cd80..d66871f1a57ed 100644
--- a/drivers/mmc/host/mmci_stm32_sdmmc.c
+++ b/drivers/mmc/host/mmci_stm32_sdmmc.c
@@ -668,6 +668,25 @@ static int sdmmc_post_sig_volt_switch(struct mmci_host *host,
return ret;
}
+static void sdmmc_enable_sdio_irq(struct mmci_host *host, int enable)
+{
+ void __iomem *base = host->base;
+ u32 mask = readl_relaxed(base + MMCIMASK0);
+
+ if (enable)
+ writel_relaxed(mask | MCI_ST_SDIOITMASK, base + MMCIMASK0);
+ else
+ writel_relaxed(mask & ~MCI_ST_SDIOITMASK, base + MMCIMASK0);
+}
+
+static void sdmmc_sdio_irq(struct mmci_host *host, u32 status)
+{
+ if (status & MCI_ST_SDIOIT) {
+ sdmmc_enable_sdio_irq(host, 0);
+ sdio_signal_irq(host->mmc);
+ }
+}
+
static struct mmci_host_ops sdmmc_variant_ops = {
.validate_data = sdmmc_idma_validate_data,
.prep_data = sdmmc_idma_prep_data,
@@ -681,6 +700,8 @@ static struct mmci_host_ops sdmmc_variant_ops = {
.busy_complete = sdmmc_busy_complete,
.pre_sig_volt_switch = sdmmc_pre_sig_volt_vswitch,
.post_sig_volt_switch = sdmmc_post_sig_volt_switch,
+ .enable_sdio_irq = sdmmc_enable_sdio_irq,
+ .sdio_irq = sdmmc_sdio_irq,
};
static struct sdmmc_tuning_ops dlyb_tuning_mp15_ops = {
--
2.34.1
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