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path: root/drivers/mmc/host/meson-gx-mmc.c
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Diffstat (limited to 'drivers/mmc/host/meson-gx-mmc.c')
-rw-r--r--drivers/mmc/host/meson-gx-mmc.c100
1 files changed, 75 insertions, 25 deletions
diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index c201c378537e..c2690c1a50ff 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -21,11 +21,11 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/delay.h>
#include <linux/device.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/ioport.h>
-#include <linux/spinlock.h>
#include <linux/dma-mapping.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
@@ -66,6 +66,9 @@
#define SD_EMMC_DELAY 0x4
#define SD_EMMC_ADJUST 0x8
+#define ADJUST_ADJ_DELAY_MASK GENMASK(21, 16)
+#define ADJUST_DS_EN BIT(15)
+#define ADJUST_ADJ_EN BIT(13)
#define SD_EMMC_DELAY1 0x4
#define SD_EMMC_DELAY2 0x8
@@ -90,9 +93,11 @@
#define CFG_CLK_ALWAYS_ON BIT(18)
#define CFG_CHK_DS BIT(20)
#define CFG_AUTO_CLK BIT(23)
+#define CFG_ERR_ABORT BIT(27)
#define SD_EMMC_STATUS 0x48
#define STATUS_BUSY BIT(31)
+#define STATUS_DESC_BUSY BIT(30)
#define STATUS_DATI GENMASK(23, 16)
#define SD_EMMC_IRQ_EN 0x4c
@@ -141,6 +146,7 @@ struct meson_mmc_data {
unsigned int tx_delay_mask;
unsigned int rx_delay_mask;
unsigned int always_on;
+ unsigned int adjust;
};
struct sd_emmc_desc {
@@ -156,7 +162,6 @@ struct meson_host {
struct mmc_host *mmc;
struct mmc_command *cmd;
- spinlock_t lock;
void __iomem *regs;
struct clk *core_clk;
struct clk *mmc_clk;
@@ -633,14 +638,8 @@ static int meson_mmc_clk_init(struct meson_host *host)
if (ret)
return ret;
- /*
- * Set phases : These values are mostly the datasheet recommended ones
- * except for the Tx phase. Datasheet recommends 180 but some cards
- * fail at initialisation with it. 270 works just fine, it fixes these
- * initialisation issues and enable eMMC DDR52 mode.
- */
clk_set_phase(host->mmc_clk, 180);
- clk_set_phase(host->tx_clk, 270);
+ clk_set_phase(host->tx_clk, 0);
clk_set_phase(host->rx_clk, 0);
return clk_prepare_enable(host->mmc_clk);
@@ -928,6 +927,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
cmd_cfg |= FIELD_PREP(CMD_CFG_CMD_INDEX_MASK, cmd->opcode);
cmd_cfg |= CMD_CFG_OWNER; /* owned by CPU */
+ cmd_cfg |= CMD_CFG_ERROR; /* stop in case of error */
meson_mmc_set_response_bits(cmd, &cmd_cfg);
@@ -1022,29 +1022,34 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
u32 irq_en, status, raw_status;
irqreturn_t ret = IRQ_NONE;
- if (WARN_ON(!host) || WARN_ON(!host->cmd))
+ irq_en = readl(host->regs + SD_EMMC_IRQ_EN);
+ raw_status = readl(host->regs + SD_EMMC_STATUS);
+ status = raw_status & irq_en;
+
+ if (!status) {
+ dev_dbg(host->dev,
+ "Unexpected IRQ! irq_en 0x%08x - status 0x%08x\n",
+ irq_en, raw_status);
return IRQ_NONE;
+ }
- spin_lock(&host->lock);
+ if (WARN_ON(!host) || WARN_ON(!host->cmd))
+ return IRQ_NONE;
cmd = host->cmd;
data = cmd->data;
- irq_en = readl(host->regs + SD_EMMC_IRQ_EN);
- raw_status = readl(host->regs + SD_EMMC_STATUS);
- status = raw_status & irq_en;
-
cmd->error = 0;
if (status & IRQ_CRC_ERR) {
dev_dbg(host->dev, "CRC Error - status 0x%08x\n", status);
cmd->error = -EILSEQ;
- ret = IRQ_HANDLED;
+ ret = IRQ_WAKE_THREAD;
goto out;
}
if (status & IRQ_TIMEOUTS) {
dev_dbg(host->dev, "Timeout - status 0x%08x\n", status);
cmd->error = -ETIMEDOUT;
- ret = IRQ_HANDLED;
+ ret = IRQ_WAKE_THREAD;
goto out;
}
@@ -1069,17 +1074,48 @@ out:
/* ack all enabled interrupts */
writel(irq_en, host->regs + SD_EMMC_STATUS);
+ if (cmd->error) {
+ /* Stop desc in case of errors */
+ u32 start = readl(host->regs + SD_EMMC_START);
+
+ start &= ~START_DESC_BUSY;
+ writel(start, host->regs + SD_EMMC_START);
+ }
+
if (ret == IRQ_HANDLED)
meson_mmc_request_done(host->mmc, cmd->mrq);
- else if (ret == IRQ_NONE)
- dev_warn(host->dev,
- "Unexpected IRQ! status=0x%08x, irq_en=0x%08x\n",
- raw_status, irq_en);
- spin_unlock(&host->lock);
return ret;
}
+static int meson_mmc_wait_desc_stop(struct meson_host *host)
+{
+ int loop;
+ u32 status;
+
+ /*
+ * It may sometimes take a while for it to actually halt. Here, we
+ * are giving it 5ms to comply
+ *
+ * If we don't confirm the descriptor is stopped, it might raise new
+ * IRQs after we have called mmc_request_done() which is bad.
+ */
+ for (loop = 50; loop; loop--) {
+ status = readl(host->regs + SD_EMMC_STATUS);
+ if (status & (STATUS_BUSY | STATUS_DESC_BUSY))
+ udelay(100);
+ else
+ break;
+ }
+
+ if (status & (STATUS_BUSY | STATUS_DESC_BUSY)) {
+ dev_err(host->dev, "Timed out waiting for host to stop\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
{
struct meson_host *host = dev_id;
@@ -1090,6 +1126,13 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
if (WARN_ON(!cmd))
return IRQ_NONE;
+ if (cmd->error) {
+ meson_mmc_wait_desc_stop(host);
+ meson_mmc_request_done(host->mmc, cmd->mrq);
+
+ return IRQ_HANDLED;
+ }
+
data = cmd->data;
if (meson_mmc_bounce_buf_read(data)) {
xfer_bytes = data->blksz * data->blocks;
@@ -1123,14 +1166,21 @@ static int meson_mmc_get_cd(struct mmc_host *mmc)
static void meson_mmc_cfg_init(struct meson_host *host)
{
- u32 cfg = 0;
+ u32 cfg = 0, adj = 0;
cfg |= FIELD_PREP(CFG_RESP_TIMEOUT_MASK,
ilog2(SD_EMMC_CFG_RESP_TIMEOUT));
cfg |= FIELD_PREP(CFG_RC_CC_MASK, ilog2(SD_EMMC_CFG_CMD_GAP));
cfg |= FIELD_PREP(CFG_BLK_LEN_MASK, ilog2(SD_EMMC_CFG_BLK_SIZE));
+ /* abort chain on R/W errors */
+ cfg |= CFG_ERR_ABORT;
+
writel(cfg, host->regs + SD_EMMC_CFG);
+
+ /* enable signal resampling w/o delay */
+ adj = ADJUST_ADJ_EN;
+ writel(adj, host->regs + host->data->adjust);
}
static int meson_mmc_card_busy(struct mmc_host *mmc)
@@ -1191,8 +1241,6 @@ static int meson_mmc_probe(struct platform_device *pdev)
host->dev = &pdev->dev;
dev_set_drvdata(&pdev->dev, host);
- spin_lock_init(&host->lock);
-
/* Get regulators and the supported OCR mask */
host->vqmmc_enabled = false;
ret = mmc_regulator_get_supply(mmc);
@@ -1356,12 +1404,14 @@ static const struct meson_mmc_data meson_gx_data = {
.tx_delay_mask = CLK_V2_TX_DELAY_MASK,
.rx_delay_mask = CLK_V2_RX_DELAY_MASK,
.always_on = CLK_V2_ALWAYS_ON,
+ .adjust = SD_EMMC_ADJUST,
};
static const struct meson_mmc_data meson_axg_data = {
.tx_delay_mask = CLK_V3_TX_DELAY_MASK,
.rx_delay_mask = CLK_V3_RX_DELAY_MASK,
.always_on = CLK_V3_ALWAYS_ON,
+ .adjust = SD_EMMC_V3_ADJUST,
};
static const struct of_device_id meson_mmc_of_match[] = {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 00:03:51 +0100