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path: root/drivers/mmc/host/dw_mmc.c
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Diffstat (limited to 'drivers/mmc/host/dw_mmc.c')
-rw-r--r--drivers/mmc/host/dw_mmc.c208
1 files changed, 129 insertions, 79 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index ff9b0fcf8300..38099bafcd4c 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -467,12 +467,87 @@ static void dw_mci_dmac_complete_dma(void *arg)
}
}
-static inline void dw_mci_prepare_desc64(struct dw_mci *host,
+static int dw_mci_idmac_init(struct dw_mci *host)
+{
+ int i;
+
+ if (host->dma_64bit_address == 1) {
+ struct idmac_desc_64addr *p;
+ /* Number of descriptors in the ring buffer */
+ host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc_64addr);
+
+ /* Forward link the descriptor list */
+ for (i = 0, p = host->sg_cpu; i < host->ring_size - 1;
+ i++, p++) {
+ p->des6 = (host->sg_dma +
+ (sizeof(struct idmac_desc_64addr) *
+ (i + 1))) & 0xffffffff;
+
+ p->des7 = (u64)(host->sg_dma +
+ (sizeof(struct idmac_desc_64addr) *
+ (i + 1))) >> 32;
+ /* Initialize reserved and buffer size fields to "0" */
+ p->des1 = 0;
+ p->des2 = 0;
+ p->des3 = 0;
+ }
+
+ /* Set the last descriptor as the end-of-ring descriptor */
+ p->des6 = host->sg_dma & 0xffffffff;
+ p->des7 = (u64)host->sg_dma >> 32;
+ p->des0 = IDMAC_DES0_ER;
+
+ } else {
+ struct idmac_desc *p;
+ /* Number of descriptors in the ring buffer */
+ host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
+
+ /* Forward link the descriptor list */
+ for (i = 0, p = host->sg_cpu;
+ i < host->ring_size - 1;
+ i++, p++) {
+ p->des3 = cpu_to_le32(host->sg_dma +
+ (sizeof(struct idmac_desc) * (i + 1)));
+ p->des1 = 0;
+ }
+
+ /* Set the last descriptor as the end-of-ring descriptor */
+ p->des3 = cpu_to_le32(host->sg_dma);
+ p->des0 = cpu_to_le32(IDMAC_DES0_ER);
+ }
+
+ dw_mci_idmac_reset(host);
+
+ if (host->dma_64bit_address == 1) {
+ /* Mask out interrupts - get Tx & Rx complete only */
+ mci_writel(host, IDSTS64, IDMAC_INT_CLR);
+ mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI |
+ SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
+
+ /* Set the descriptor base address */
+ mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff);
+ mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32);
+
+ } else {
+ /* Mask out interrupts - get Tx & Rx complete only */
+ mci_writel(host, IDSTS, IDMAC_INT_CLR);
+ mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI |
+ SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
+
+ /* Set the descriptor base address */
+ mci_writel(host, DBADDR, host->sg_dma);
+ }
+
+ return 0;
+}
+
+static inline int dw_mci_prepare_desc64(struct dw_mci *host,
struct mmc_data *data,
unsigned int sg_len)
{
unsigned int desc_len;
struct idmac_desc_64addr *desc_first, *desc_last, *desc;
+ unsigned long timeout;
int i;
desc_first = desc_last = desc = host->sg_cpu;
@@ -489,6 +564,19 @@ static inline void dw_mci_prepare_desc64(struct dw_mci *host,
length -= desc_len;
/*
+ * Wait for the former clear OWN bit operation
+ * of IDMAC to make sure that this descriptor
+ * isn't still owned by IDMAC as IDMAC's write
+ * ops and CPU's read ops are asynchronous.
+ */
+ timeout = jiffies + msecs_to_jiffies(100);
+ while (readl(&desc->des0) & IDMAC_DES0_OWN) {
+ if (time_after(jiffies, timeout))
+ goto err_own_bit;
+ udelay(10);
+ }
+
+ /*
* Set the OWN bit and disable interrupts
* for this descriptor
*/
@@ -516,15 +604,24 @@ static inline void dw_mci_prepare_desc64(struct dw_mci *host,
/* Set last descriptor */
desc_last->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
desc_last->des0 |= IDMAC_DES0_LD;
+
+ return 0;
+err_own_bit:
+ /* restore the descriptor chain as it's polluted */
+ dev_dbg(host->dev, "desciptor is still owned by IDMAC.\n");
+ memset(host->sg_cpu, 0, PAGE_SIZE);
+ dw_mci_idmac_init(host);
+ return -EINVAL;
}
-static inline void dw_mci_prepare_desc32(struct dw_mci *host,
+static inline int dw_mci_prepare_desc32(struct dw_mci *host,
struct mmc_data *data,
unsigned int sg_len)
{
unsigned int desc_len;
struct idmac_desc *desc_first, *desc_last, *desc;
+ unsigned long timeout;
int i;
desc_first = desc_last = desc = host->sg_cpu;
@@ -541,6 +638,20 @@ static inline void dw_mci_prepare_desc32(struct dw_mci *host,
length -= desc_len;
/*
+ * Wait for the former clear OWN bit operation
+ * of IDMAC to make sure that this descriptor
+ * isn't still owned by IDMAC as IDMAC's write
+ * ops and CPU's read ops are asynchronous.
+ */
+ timeout = jiffies + msecs_to_jiffies(100);
+ while (readl(&desc->des0) &
+ cpu_to_le32(IDMAC_DES0_OWN)) {
+ if (time_after(jiffies, timeout))
+ goto err_own_bit;
+ udelay(10);
+ }
+
+ /*
* Set the OWN bit and disable interrupts
* for this descriptor
*/
@@ -569,16 +680,28 @@ static inline void dw_mci_prepare_desc32(struct dw_mci *host,
desc_last->des0 &= cpu_to_le32(~(IDMAC_DES0_CH |
IDMAC_DES0_DIC));
desc_last->des0 |= cpu_to_le32(IDMAC_DES0_LD);
+
+ return 0;
+err_own_bit:
+ /* restore the descriptor chain as it's polluted */
+ dev_dbg(host->dev, "desciptor is still owned by IDMAC.\n");
+ memset(host->sg_cpu, 0, PAGE_SIZE);
+ dw_mci_idmac_init(host);
+ return -EINVAL;
}
static int dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
{
u32 temp;
+ int ret;
if (host->dma_64bit_address == 1)
- dw_mci_prepare_desc64(host, host->data, sg_len);
+ ret = dw_mci_prepare_desc64(host, host->data, sg_len);
else
- dw_mci_prepare_desc32(host, host->data, sg_len);
+ ret = dw_mci_prepare_desc32(host, host->data, sg_len);
+
+ if (ret)
+ goto out;
/* drain writebuffer */
wmb();
@@ -603,81 +726,8 @@ static int dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
/* Start it running */
mci_writel(host, PLDMND, 1);
- return 0;
-}
-
-static int dw_mci_idmac_init(struct dw_mci *host)
-{
- int i;
-
- if (host->dma_64bit_address == 1) {
- struct idmac_desc_64addr *p;
- /* Number of descriptors in the ring buffer */
- host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc_64addr);
-
- /* Forward link the descriptor list */
- for (i = 0, p = host->sg_cpu; i < host->ring_size - 1;
- i++, p++) {
- p->des6 = (host->sg_dma +
- (sizeof(struct idmac_desc_64addr) *
- (i + 1))) & 0xffffffff;
-
- p->des7 = (u64)(host->sg_dma +
- (sizeof(struct idmac_desc_64addr) *
- (i + 1))) >> 32;
- /* Initialize reserved and buffer size fields to "0" */
- p->des1 = 0;
- p->des2 = 0;
- p->des3 = 0;
- }
-
- /* Set the last descriptor as the end-of-ring descriptor */
- p->des6 = host->sg_dma & 0xffffffff;
- p->des7 = (u64)host->sg_dma >> 32;
- p->des0 = IDMAC_DES0_ER;
-
- } else {
- struct idmac_desc *p;
- /* Number of descriptors in the ring buffer */
- host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
-
- /* Forward link the descriptor list */
- for (i = 0, p = host->sg_cpu;
- i < host->ring_size - 1;
- i++, p++) {
- p->des3 = cpu_to_le32(host->sg_dma +
- (sizeof(struct idmac_desc) * (i + 1)));
- p->des1 = 0;
- }
-
- /* Set the last descriptor as the end-of-ring descriptor */
- p->des3 = cpu_to_le32(host->sg_dma);
- p->des0 = cpu_to_le32(IDMAC_DES0_ER);
- }
-
- dw_mci_idmac_reset(host);
-
- if (host->dma_64bit_address == 1) {
- /* Mask out interrupts - get Tx & Rx complete only */
- mci_writel(host, IDSTS64, IDMAC_INT_CLR);
- mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI |
- SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
-
- /* Set the descriptor base address */
- mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff);
- mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32);
-
- } else {
- /* Mask out interrupts - get Tx & Rx complete only */
- mci_writel(host, IDSTS, IDMAC_INT_CLR);
- mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI |
- SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
-
- /* Set the descriptor base address */
- mci_writel(host, DBADDR, host->sg_dma);
- }
-
- return 0;
+out:
+ return ret;
}
static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-31 04:39:14 +0000