mmc: sdhci: Add Support for ADMA2
The Standard Host Controller Interface (SDHCI) specification version
3.00 adds support for Advanced DMA (ADMA) for both 64 and 32 bit widths
of DMA. ADMA2 uses a table of descriptors for aggregating DMA requests.
This significantly improves read and write throughput.
Add Support for the same.
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index c34dd5d..69c9830 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -385,6 +385,20 @@
This enables support for the SDMA (Single Operation DMA) defined
in the SD Host Controller Standard Specification Version 1.00 .
+config MMC_SDHCI_ADMA
+ bool "Support SDHCI ADMA2"
+ depends on MMC_SDHCI
+ help
+ This enables support for the ADMA (Advanced DMA) defined
+ in the SD Host Controller Standard Specification Version 3.00
+
+config SPL_MMC_SDHCI_ADMA
+ bool "Support SDHCI ADMA2 in SPL"
+ depends on MMC_SDHCI
+ help
+ This enables support for the ADMA (Advanced DMA) defined
+ in the SD Host Controller Standard Specification Version 3.00 in SPL.
+
config MMC_SDHCI_ATMEL
bool "Atmel SDHCI controller support"
depends on ARCH_AT91
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index c82af1e..e2bb90a 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -66,7 +66,64 @@
sdhci_writel(host, *(u32 *)offs, SDHCI_BUFFER);
}
}
-#ifdef CONFIG_MMC_SDHCI_SDMA
+
+#if CONFIG_IS_ENABLED(MMC_SDHCI_ADMA)
+static void sdhci_adma_desc(struct sdhci_host *host, char *buf, u16 len,
+ bool end)
+{
+ struct sdhci_adma_desc *desc;
+ u8 attr;
+
+ desc = &host->adma_desc_table[host->desc_slot];
+
+ attr = ADMA_DESC_ATTR_VALID | ADMA_DESC_TRANSFER_DATA;
+ if (!end)
+ host->desc_slot++;
+ else
+ attr |= ADMA_DESC_ATTR_END;
+
+ desc->attr = attr;
+ desc->len = len;
+ desc->reserved = 0;
+ desc->addr_lo = (dma_addr_t)buf;
+#ifdef CONFIG_DMA_ADDR_T_64BIT
+ desc->addr_hi = (u64)buf >> 32;
+#endif
+}
+
+static void sdhci_prepare_adma_table(struct sdhci_host *host,
+ struct mmc_data *data)
+{
+ uint trans_bytes = data->blocksize * data->blocks;
+ uint desc_count = DIV_ROUND_UP(trans_bytes, ADMA_MAX_LEN);
+ int i = desc_count;
+ char *buf;
+
+ host->desc_slot = 0;
+
+ if (data->flags & MMC_DATA_READ)
+ buf = data->dest;
+ else
+ buf = (char *)data->src;
+
+ while (--i) {
+ sdhci_adma_desc(host, buf, ADMA_MAX_LEN, false);
+ buf += ADMA_MAX_LEN;
+ trans_bytes -= ADMA_MAX_LEN;
+ }
+
+ sdhci_adma_desc(host, buf, trans_bytes, true);
+
+ flush_cache((dma_addr_t)host->adma_desc_table,
+ ROUND(desc_count * sizeof(struct sdhci_adma_desc),
+ ARCH_DMA_MINALIGN));
+}
+#elif defined(CONFIG_MMC_SDHCI_SDMA)
+static void sdhci_prepare_adma_table(struct sdhci_host *host,
+ struct mmc_data *data)
+{}
+#endif
+#if (defined(CONFIG_MMC_SDHCI_SDMA) || CONFIG_IS_ENABLED(MMC_SDHCI_ADMA))
static void sdhci_prepare_dma(struct sdhci_host *host, struct mmc_data *data,
int *is_aligned, int trans_bytes)
{
@@ -77,29 +134,44 @@
else
host->start_addr = (dma_addr_t)data->src;
- if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
- (host->start_addr & 0x7) != 0x0) {
- *is_aligned = 0;
- host->start_addr = (unsigned long)aligned_buffer;
- if (data->flags != MMC_DATA_READ)
- memcpy(aligned_buffer, data->src, trans_bytes);
- }
-
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
ctrl &= ~SDHCI_CTRL_DMA_MASK;
+ if (host->flags & USE_ADMA64)
+ ctrl |= SDHCI_CTRL_ADMA64;
+ else if (host->flags & USE_ADMA)
+ ctrl |= SDHCI_CTRL_ADMA32;
sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+ if (host->flags & USE_SDMA) {
+ if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
+ (host->start_addr & 0x7) != 0x0) {
+ *is_aligned = 0;
+ host->start_addr = (unsigned long)aligned_buffer;
+ if (data->flags != MMC_DATA_READ)
+ memcpy(aligned_buffer, data->src, trans_bytes);
+ }
+
#if defined(CONFIG_FIXED_SDHCI_ALIGNED_BUFFER)
- /*
- * Always use this bounce-buffer when
- * CONFIG_FIXED_SDHCI_ALIGNED_BUFFER is defined
- */
- *is_aligned = 0;
- host->start_addr = (unsigned long)aligned_buffer;
- if (data->flags != MMC_DATA_READ)
- memcpy(aligned_buffer, data->src, trans_bytes);
+ /*
+ * Always use this bounce-buffer when
+ * CONFIG_FIXED_SDHCI_ALIGNED_BUFFER is defined
+ */
+ *is_aligned = 0;
+ host->start_addr = (unsigned long)aligned_buffer;
+ if (data->flags != MMC_DATA_READ)
+ memcpy(aligned_buffer, data->src, trans_bytes);
#endif
- sdhci_writel(host, host->start_addr, SDHCI_DMA_ADDRESS);
+ sdhci_writel(host, host->start_addr, SDHCI_DMA_ADDRESS);
+
+ } else if (host->flags & (USE_ADMA | USE_ADMA64)) {
+ sdhci_prepare_adma_table(host, data);
+
+ sdhci_writel(host, (u32)host->adma_addr, SDHCI_ADMA_ADDRESS);
+ if (host->flags & USE_ADMA64)
+ sdhci_writel(host, (u64)host->adma_addr >> 32,
+ SDHCI_ADMA_ADDRESS_HI);
+ }
+
flush_cache(host->start_addr, ROUND(trans_bytes, ARCH_DMA_MINALIGN));
}
#else
@@ -138,12 +210,16 @@
continue;
}
}
- if ((host->flags & USE_SDMA) && !transfer_done &&
+ if ((host->flags & USE_DMA) && !transfer_done &&
(stat & SDHCI_INT_DMA_END)) {
sdhci_writel(host, SDHCI_INT_DMA_END, SDHCI_INT_STATUS);
- start_addr &= ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1);
- start_addr += SDHCI_DEFAULT_BOUNDARY_SIZE;
- sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
+ if (host->flags & USE_SDMA) {
+ start_addr &=
+ ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1);
+ start_addr += SDHCI_DEFAULT_BOUNDARY_SIZE;
+ sdhci_writel(host, start_addr,
+ SDHCI_DMA_ADDRESS);
+ }
}
if (timeout-- > 0)
udelay(10);
@@ -252,7 +328,7 @@
if (data->flags == MMC_DATA_READ)
mode |= SDHCI_TRNS_READ;
- if (host->flags & USE_SDMA) {
+ if (host->flags & USE_DMA) {
mode |= SDHCI_TRNS_DMA;
sdhci_prepare_dma(host, data, &is_aligned, trans_bytes);
}
@@ -579,6 +655,22 @@
host->flags |= USE_SDMA;
#endif
+#if CONFIG_IS_ENABLED(MMC_SDHCI_ADMA)
+ if (!(caps & SDHCI_CAN_DO_ADMA2)) {
+ printf("%s: Your controller doesn't support SDMA!!\n",
+ __func__);
+ return -EINVAL;
+ }
+ host->adma_desc_table = (struct sdhci_adma_desc *)
+ memalign(ARCH_DMA_MINALIGN, ADMA_TABLE_SZ);
+
+ host->adma_addr = (dma_addr_t)host->adma_desc_table;
+#ifdef CONFIG_DMA_ADDR_T_64BIT
+ host->flags |= USE_ADMA64;
+#else
+ host->flags |= USE_ADMA;
+#endif
+#endif
if (host->quirks & SDHCI_QUIRK_REG32_RW)
host->version =
sdhci_readl(host, SDHCI_HOST_VERSION - 2) >> 16;