[U-Boot] [U-Boot, 3/5] mmc: omap_hsmmc: Add support for DMA (ADMA2)
Jaehoon Chung
jh80.chung at samsung.com
Fri Jul 28 12:46:19 UTC 2017
Hi JJ
On 07/12/2017 01:20 AM, Jean-Jacques Hiblot wrote:
> From: Kishon Vijay Abraham I <kishon at ti.com>
>
> The omap hsmmc host controller can have the ADMA2 feature. It brings better
> read and write throughput.
> On most SOC, the capability is read from the hl_hwinfo register. On OMAP3,
> DMA support is compiled out.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon at ti.com>
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot at ti.com>
Sorry..i added the some comment at below.
> ---
> arch/arm/include/asm/omap_mmc.h | 12 ++-
> drivers/mmc/omap_hsmmc.c | 186 +++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 195 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/include/asm/omap_mmc.h b/arch/arm/include/asm/omap_mmc.h
> index 2b489a4..206badb 100644
> --- a/arch/arm/include/asm/omap_mmc.h
> +++ b/arch/arm/include/asm/omap_mmc.h
> @@ -29,7 +29,10 @@
>
> struct hsmmc {
> #ifndef CONFIG_OMAP34XX
> - unsigned char res0[0x100];
> + unsigned int hl_rev;
> + unsigned int hl_hwinfo;
> + unsigned int hl_sysconfig;
> + unsigned char res0[0xf4];
> #endif
> unsigned char res1[0x10];
> unsigned int sysconfig; /* 0x10 */
> @@ -52,6 +55,9 @@ struct hsmmc {
> unsigned int ie; /* 0x134 */
> unsigned char res4[0x8];
> unsigned int capa; /* 0x140 */
> + unsigned char res5[0x10];
> + unsigned int admaes; /* 0x154 */
> + unsigned int admasal; /* 0x158 */
> };
>
> struct omap_hsmmc_plat {
> @@ -64,6 +70,7 @@ struct omap_hsmmc_plat {
> /*
> * OMAP HS MMC Bit definitions
> */
> +#define MADMA_EN (0x1 << 0)
> #define MMC_SOFTRESET (0x1 << 1)
> #define RESETDONE (0x1 << 0)
> #define NOOPENDRAIN (0x0 << 0)
> @@ -80,6 +87,7 @@ struct omap_hsmmc_plat {
> #define WPP_ACTIVEHIGH (0x0 << 8)
> #define RESERVED_MASK (0x3 << 9)
> #define CTPL_MMC_SD (0x0 << 11)
> +#define DMA_MASTER (0x1 << 20)
> #define BLEN_512BYTESLEN (0x200 << 0)
> #define NBLK_STPCNT (0x0 << 16)
> #define DE_DISABLE (0x0 << 0)
> @@ -119,6 +127,7 @@ struct omap_hsmmc_plat {
> #define SDBP_PWRON (0x1 << 8)
> #define SDVS_1V8 (0x5 << 9)
> #define SDVS_3V0 (0x6 << 9)
> +#define DMA_SELECT (0x2 << 3)
> #define ICE_MASK (0x1 << 0)
> #define ICE_STOP (0x0 << 0)
> #define ICS_MASK (0x1 << 1)
> @@ -148,6 +157,7 @@ struct omap_hsmmc_plat {
> #define IE_DTO (0x01 << 20)
> #define IE_DCRC (0x01 << 21)
> #define IE_DEB (0x01 << 22)
> +#define IE_ADMAE (0x01 << 25)
> #define IE_CERR (0x01 << 28)
> #define IE_BADA (0x01 << 29)
>
> diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c
> index 2c1e429..3419dc5 100644
> --- a/drivers/mmc/omap_hsmmc.c
> +++ b/drivers/mmc/omap_hsmmc.c
> @@ -25,6 +25,7 @@
> #include <config.h>
> #include <common.h>
> #include <malloc.h>
> +#include <memalign.h>
> #include <mmc.h>
> #include <part.h>
> #include <i2c.h>
> @@ -71,10 +72,37 @@ struct omap_hsmmc_data {
> int wp_gpio;
> #endif
> #endif
> + u8 controller_flags;
> +#ifndef CONFIG_OMAP34XX
> + struct omap_hsmmc_adma_desc *adma_desc_table;
> + uint desc_slot;
> +#endif
> +};
> +
> +#ifndef CONFIG_OMAP34XX
> +struct omap_hsmmc_adma_desc {
> + u8 attr;
> + u8 reserved;
> + u16 len;
> + u32 addr;
> };
>
> +#define ADMA_MAX_LEN 63488
> +
> +/* Decriptor table defines */
> +#define ADMA_DESC_ATTR_VALID BIT(0)
> +#define ADMA_DESC_ATTR_END BIT(1)
> +#define ADMA_DESC_ATTR_INT BIT(2)
> +#define ADMA_DESC_ATTR_ACT1 BIT(4)
> +#define ADMA_DESC_ATTR_ACT2 BIT(5)
> +
> +#define ADMA_DESC_TRANSFER_DATA ADMA_DESC_ATTR_ACT2
> +#define ADMA_DESC_LINK_DESC (ADMA_DESC_ATTR_ACT1 | ADMA_DESC_ATTR_ACT2)
> +#endif
> +
> /* If we fail after 1 second wait, something is really bad */
> #define MAX_RETRY_MS 1000
> +#define OMAP_HSMMC_USE_ADMA BIT(2)
>
> static int mmc_read_data(struct hsmmc *mmc_base, char *buf, unsigned int size);
> static int mmc_write_data(struct hsmmc *mmc_base, const char *buf,
> @@ -242,6 +270,11 @@ static int omap_hsmmc_init_setup(struct mmc *mmc)
> return -ETIMEDOUT;
> }
> }
> +#ifndef CONFIG_OMAP34XX
> + reg_val = readl(&mmc_base->hl_hwinfo);
> + if (reg_val & MADMA_EN)
> + priv->controller_flags |= OMAP_HSMMC_USE_ADMA;
> +#endif
> writel(DTW_1_BITMODE | SDBP_PWROFF | SDVS_3V0, &mmc_base->hctl);
> writel(readl(&mmc_base->capa) | VS30_3V0SUP | VS18_1V8SUP,
> &mmc_base->capa);
> @@ -269,8 +302,8 @@ static int omap_hsmmc_init_setup(struct mmc *mmc)
> writel(readl(&mmc_base->hctl) | SDBP_PWRON, &mmc_base->hctl);
>
> writel(IE_BADA | IE_CERR | IE_DEB | IE_DCRC | IE_DTO | IE_CIE |
> - IE_CEB | IE_CCRC | IE_CTO | IE_BRR | IE_BWR | IE_TC | IE_CC,
> - &mmc_base->ie);
> + IE_CEB | IE_CCRC | IE_ADMAE | IE_CTO | IE_BRR | IE_BWR | IE_TC |
> + IE_CC, &mmc_base->ie);
>
> mmc_init_stream(mmc_base);
>
> @@ -322,6 +355,123 @@ static void mmc_reset_controller_fsm(struct hsmmc *mmc_base, u32 bit)
> }
> }
> }
> +
> +#ifndef CONFIG_OMAP34XX
> +static int omap_hsmmc_adma_desc(struct mmc *mmc, char *buf, u16 len, bool end)
Can be void..?
> +{
> + struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
> + struct omap_hsmmc_adma_desc *desc;
> + u8 attr;
> +
> + desc = &priv->adma_desc_table[priv->desc_slot];
> +
> + attr = ADMA_DESC_ATTR_VALID | ADMA_DESC_TRANSFER_DATA;
> + if (!end)
> + priv->desc_slot++;
> + else
> + attr |= ADMA_DESC_ATTR_END;
> +
> + desc->len = len;
> + desc->addr = (u32)buf;
> + desc->reserved = 0;
> + desc->attr = attr;
> +
> + return 0;
> +}
> +
> +static int omap_hsmmc_prepare_adma_table(struct mmc *mmc, struct mmc_data *data)
Ditto.
> +{
> + uint total_len = data->blocksize * data->blocks;
> + uint desc_count = DIV_ROUND_UP(total_len, ADMA_MAX_LEN);
> + struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
> + int i = desc_count;
> + char *buf;
> +
> + priv->desc_slot = 0;
> + priv->adma_desc_table = (struct omap_hsmmc_adma_desc *)
> + memalign(ARCH_DMA_MINALIGN, desc_count *
> + sizeof(struct omap_hsmmc_adma_desc));
> +
> + if (data->flags & MMC_DATA_READ)
> + buf = data->dest;
> + else
> + buf = (char *)data->src;
> +
> + while (--i) {
> + omap_hsmmc_adma_desc(mmc, buf, ADMA_MAX_LEN, false);
> + buf += ADMA_MAX_LEN;
> + total_len -= ADMA_MAX_LEN;
> + }
> +
> + omap_hsmmc_adma_desc(mmc, buf, total_len, true);
> +
> + flush_dcache_range((long)priv->adma_desc_table,
> + (long)priv->adma_desc_table +
> + ROUND(desc_count *
> + sizeof(struct omap_hsmmc_adma_desc),
> + ARCH_DMA_MINALIGN));
> + return 0;
> +}
> +
> +static void omap_hsmmc_prepare_data(struct mmc *mmc, struct mmc_data *data)
> +{
> + struct hsmmc *mmc_base;
> + struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
> + u32 val;
> + char *buf;
> +
> + mmc_base = priv->base_addr;
> + omap_hsmmc_prepare_adma_table(mmc, data);
> +
> + if (data->flags & MMC_DATA_READ)
> + buf = data->dest;
> + else
> + buf = (char *)data->src;
> +
> + val = readl(&mmc_base->hctl);
> + val |= DMA_SELECT;
> + writel(val, &mmc_base->hctl);
> +
> + val = readl(&mmc_base->con);
> + val |= DMA_MASTER;
> + writel(val, &mmc_base->con);
> +
> + writel((u32)priv->adma_desc_table, &mmc_base->admasal);
> +
> + /* TODO: This shouldn't be required for read. However I don't seem
> + * to get valid data without this.
TODO? not FIXME?
> + */
> + flush_dcache_range((u32)buf,
> + (u32)buf +
> + ROUND(data->blocksize * data->blocks,
> + ARCH_DMA_MINALIGN));
> +}
> +
> +static void omap_hsmmc_dma_cleanup(struct mmc *mmc)
> +{
> + struct hsmmc *mmc_base;
> + struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
> + u32 val;
> +
> + mmc_base = priv->base_addr;
> +
> + val = readl(&mmc_base->con);
> + val &= ~DMA_MASTER;
> + writel(val, &mmc_base->con);
> +
> + val = readl(&mmc_base->hctl);
> + val &= ~DMA_SELECT;
> + writel(val, &mmc_base->hctl);
> +
> + kfree(priv->adma_desc_table);
> +}
> +#else
> +#define omap_hsmmc_adma_desc
> +#define omap_hsmmc_prepare_adma_table
> +#define omap_hsmmc_prepare_data
> +#define omap_hsmmc_dma_cleanup
> +#endif
> +
> #ifndef CONFIG_DM_MMC
> static int omap_hsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
> struct mmc_data *data)
> @@ -332,6 +482,8 @@ static int omap_hsmmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
> struct mmc_data *data)
> {
> struct omap_hsmmc_data *priv = dev_get_priv(dev);
> + struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
> + struct mmc *mmc = upriv->mmc;
> #endif
> struct hsmmc *mmc_base;
> unsigned int flags, mmc_stat;
> @@ -405,6 +557,14 @@ static int omap_hsmmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
> flags |= (DP_DATA | DDIR_READ);
> else
> flags |= (DP_DATA | DDIR_WRITE);
> +
> +#ifndef CONFIG_OMAP34XX
> + if ((priv->controller_flags & OMAP_HSMMC_USE_ADMA) &&
> + !mmc_is_tuning_cmd(cmd->cmdidx)) {
> + omap_hsmmc_prepare_data(mmc, data);
> + flags |= DE_ENABLE;
> + }
> +#endif
> }
>
> writel(cmd->cmdarg, &mmc_base->arg);
> @@ -441,6 +601,28 @@ static int omap_hsmmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
> }
> }
>
> +#ifndef CONFIG_OMAP34XX
> + if ((priv->controller_flags & OMAP_HSMMC_USE_ADMA) && data &&
> + !mmc_is_tuning_cmd(cmd->cmdidx)) {
> + if (mmc_stat & IE_ADMAE) {
> + omap_hsmmc_dma_cleanup(mmc);
> + return -1;
Use the valid error number.
> + }
> +
> + do {
> + mmc_stat = readl(&mmc_base->stat);
> + if (mmc_stat & TC_MASK) {
> + writel(readl(&mmc_base->stat) | TC_MASK,
> + &mmc_base->stat);
> + break;
> + }
> + } while (1);
Can you add the timeout? There is a potential infinte loop.
> +
> + omap_hsmmc_dma_cleanup(mmc);
> + return 0;
> + }
> +#endif
> +
> if (data && (data->flags & MMC_DATA_READ)) {
> mmc_read_data(mmc_base, data->dest,
> data->blocksize * data->blocks);
>
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