Re: [RFC PATCH 2/3] mmc: host: omap_hsmmc: Enable ADMA2

From: Peter Ujfalusi
Date: Thu May 19 2016 - 04:27:49 EST

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On 05/18/2016 11:45 AM, Kishon Vijay Abraham I wrote:
> omap hsmmc host controller has ADMA2 feature. Enable it here
> for better read and write throughput. Add a new dt binding
> "ti,use_adma" to enable ADMA2.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
> ---
> .../devicetree/bindings/mmc/ti-omap-hsmmc.txt | 1 +
> drivers/mmc/host/omap_hsmmc.c | 320 ++++++++++++++++----
> include/linux/platform_data/hsmmc-omap.h | 1 +
> 3 files changed, 256 insertions(+), 66 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> index 74166a0..eb5ceec2 100644
> --- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> +++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> @@ -28,6 +28,7 @@ specifier is required.
> dma-names: List of DMA request names. These strings correspond
> 1:1 with the DMA specifiers listed in dmas. The string naming is
> to be "rx" and "tx" for RX and TX DMA requests, respectively.
> +ti,use_adma: enable adma2 feature
>
> Examples:
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index cc916d5..b4a7d18 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -66,6 +66,8 @@
> #define OMAP_HSMMC_ISE 0x0138
> #define OMAP_HSMMC_AC12 0x013C
> #define OMAP_HSMMC_CAPA 0x0140
> +#define OMAP_HSMMC_ADMAES 0x0154
> +#define OMAP_HSMMC_ADMASAL 0x0158
>
> #define VS18 (1 << 26)
> #define VS30 (1 << 25)
> @@ -76,6 +78,7 @@
> #define SDVS_MASK 0x00000E00
> #define SDVSCLR 0xFFFFF1FF
> #define SDVSDET 0x00000400
> +#define DMA_SELECT (2 << 3)
> #define AUTOIDLE 0x1
> #define SDBP (1 << 8)
> #define DTO 0xe
> @@ -97,6 +100,7 @@
> #define FOUR_BIT (1 << 1)
> #define HSPE (1 << 2)
> #define IWE (1 << 24)
> +#define DMA_MASTER (1 << 20)
> #define DDR (1 << 19)
> #define CLKEXTFREE (1 << 16)
> #define CTPL (1 << 11)
> @@ -127,10 +131,11 @@
> #define DCRC_EN (1 << 21)
> #define DEB_EN (1 << 22)
> #define ACE_EN (1 << 24)
> +#define ADMAE_EN (1 << 24)
> #define CERR_EN (1 << 28)
> #define BADA_EN (1 << 29)
>
> -#define INT_EN_MASK (BADA_EN | CERR_EN | ACE_EN | DEB_EN | DCRC_EN |\
> +#define INT_EN_MASK (BADA_EN | CERR_EN | ADMAE_EN | ACE_EN | DEB_EN | DCRC_EN |\
> DTO_EN | CIE_EN | CEB_EN | CCRC_EN | CTO_EN | \
> BRR_EN | BWR_EN | TC_EN | CC_EN)
>
> @@ -168,6 +173,25 @@
> #define OMAP_HSMMC_WRITE(base, reg, val) \
> __raw_writel((val), (base) + OMAP_HSMMC_##reg)
>
> +struct omap_hsmmc_adma_desc {
> + u8 attr;
> + u8 reserved;
> + u16 len;
> + u32 addr;
> +} __packed;
> +
> +#define ADMA_MAX_LEN 65532
> +
> +/* 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)
> +
> struct omap_hsmmc_next {
> unsigned int dma_len;
> s32 cookie;
> @@ -213,6 +237,9 @@ struct omap_hsmmc_host {
> struct omap_hsmmc_next next_data;
> struct omap_hsmmc_platform_data *pdata;
>
> + struct omap_hsmmc_adma_desc *adma_desc_table;
> + dma_addr_t adma_desc_table_addr;
> +
> /* return MMC cover switch state, can be NULL if not supported.
> *
> * possible return values:
> @@ -951,6 +978,19 @@ static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host,
> return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
> }
>
> +static void omap_hsmmc_adma_cleanup(struct omap_hsmmc_host *host)
> +{
> + u32 val;
> +
> + val = OMAP_HSMMC_READ(host->base, HCTL);
> + val &= ~DMA_SELECT;
> + OMAP_HSMMC_WRITE(host->base, HCTL, val);
> +
> + val = OMAP_HSMMC_READ(host->base, CON);
> + val &= ~DMA_MASTER;
> + OMAP_HSMMC_WRITE(host->base, CON, val);
> +}
> +
> static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
> {
> int dma_ch;
> @@ -963,8 +1003,11 @@ static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_req
>
> omap_hsmmc_disable_irq(host);
> /* Do not complete the request if DMA is still in progress */
> - if (mrq->data && dma_ch != -1)
> + if (host->pdata->controller_flags == OMAP_HSMMC_USE_ADMA)

host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA

and I would probably name the flag to OMAP_HSMMC_MASTER_DMA_SUPPORTED

> + omap_hsmmc_adma_cleanup(host);
> + else if (mrq->data && dma_ch != -1)
> return;
> +
> host->mrq = NULL;
> mmc_request_done(host->mmc, mrq);
> pm_runtime_mark_last_busy(host->dev);
> @@ -1052,15 +1095,22 @@ static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
> host->dma_ch = -1;
> spin_unlock_irqrestore(&host->irq_lock, flags);
>
> - if (dma_ch != -1) {
> - struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data);
> -
> - dmaengine_terminate_all(chan);
> - dma_unmap_sg(chan->device->dev,
> - host->data->sg, host->data->sg_len,
> + if (!(host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA)) {

it might be better to use the same order in the driver for Master and Slave
DMA cases:

if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA) {
/* Master DMA case */
} else {
/* Slave DMA case */
}

It will make the driver easier to read.

> + if (dma_ch != -1) {
> + struct dma_chan *chan = omap_hsmmc_get_dma_chan(host,
> + host->data);
> + dmaengine_terminate_all(chan);
> + dma_unmap_sg(chan->device->dev,
> + host->data->sg, host->data->sg_len,
> omap_hsmmc_get_dma_dir(host, host->data));
>
> + host->data->host_cookie = 0;
> + }
> + } else {
> + dma_unmap_sg(host->dev, host->data->sg, host->data->sg_len,
> + omap_hsmmc_get_dma_dir(host, host->data));
> host->data->host_cookie = 0;
> +
> }
> host->data = NULL;
> }
> @@ -1191,6 +1241,14 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
> }
> dev_dbg(mmc_dev(host->mmc), "AC12 err: 0x%x\n", ac12);
> }
> +
> + if (status & ADMAE_EN) {
> + u32 val;
> +
> + val = OMAP_HSMMC_READ(host->base, ADMAES);
> + dev_dbg(mmc_dev(host->mmc), "ADMA error status: 0x%x\n",
> + val);
> + }
> }
>
> OMAP_HSMMC_WRITE(host->base, STAT, status);
> @@ -1378,6 +1436,7 @@ static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
> struct dma_chan *chan)
> {
> int dma_len;
> + struct device *dev;
>
> if (!next && data->host_cookie &&
> data->host_cookie != host->next_data.cookie) {
> @@ -1387,9 +1446,14 @@ static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
> data->host_cookie = 0;
> }
>
> + if (chan)
> + dev = chan->device->dev;
> + else
> + dev = mmc_dev(host->mmc);
> +
> /* Check if next job is already prepared */
> if (next || data->host_cookie != host->next_data.cookie) {
> - dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
> + dma_len = dma_map_sg(dev, data->sg, data->sg_len,
> omap_hsmmc_get_dma_dir(host, data));
>
> } else {
> @@ -1516,6 +1580,7 @@ static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host)
> {
> struct mmc_request *req = host->mrq;
> struct dma_chan *chan;
> + int val;
>
> if (!req->data)
> return;
> @@ -1523,10 +1588,66 @@ static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host)
> | (req->data->blocks << 16));
> set_data_timeout(host, req->data->timeout_ns,
> req->data->timeout_clks);
> - chan = omap_hsmmc_get_dma_chan(host, req->data);
> - dma_async_issue_pending(chan);
> +
> + if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA) {
> + val = OMAP_HSMMC_READ(host->base, HCTL);
> + val |= DMA_SELECT;
> + OMAP_HSMMC_WRITE(host->base, HCTL, val);
> +
> + val = OMAP_HSMMC_READ(host->base, CON);
> + val |= DMA_MASTER;
> + OMAP_HSMMC_WRITE(host->base, CON, val);
> +
> + OMAP_HSMMC_WRITE(host->base, ADMASAL,
> + (u32)host->adma_desc_table_addr);
> + } else {
> + chan = omap_hsmmc_get_dma_chan(host, req->data);
> + dma_async_issue_pending(chan);
> + }
> +}
> +
> +static int omap_hsmmc_write_adma_desc(struct omap_hsmmc_host *host, void *desc,
> + dma_addr_t addr, u16 len, u8 attr)
> +{
> + struct omap_hsmmc_adma_desc *dma_desc = desc;
> +
> + dma_desc->len = len;
> + dma_desc->addr = (u32)addr;
> + dma_desc->reserved = 0;
> + dma_desc->attr = attr;
> +
> + return 0;
> }
>
> +static int omap_hsmmc_setup_adma_transfer(struct omap_hsmmc_host *host,
> + struct mmc_request *req)
> +{
> + struct mmc_data *data = req->data;
> + struct scatterlist *sg;
> + int i;
> + int len;
> + int ret;
> + dma_addr_t addr;
> + struct omap_hsmmc_adma_desc *dma_desc;
> +
> + ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, NULL);
> + if (ret)
> + return ret;
> +
> + dma_desc = host->adma_desc_table;
> + for_each_sg(data->sg, sg, host->dma_len, i) {
> + addr = sg_dma_address(sg);
> + len = sg_dma_len(sg);
> + WARN_ON(len > ADMA_MAX_LEN);
> + omap_hsmmc_write_adma_desc(host, dma_desc, addr, len,
> + ADMA_DESC_ATTR_VALID |
> + ADMA_DESC_TRANSFER_DATA);
> + dma_desc++;
> + }
> + omap_hsmmc_write_adma_desc(host, dma_desc, 0, 0, ADMA_DESC_ATTR_END);
> +
> + return 0;
> +}

Would be nice to group the ADMA functions in one section, not scattering it
around the driver.

> /*
> * Configure block length for MMC/SD cards and initiate the transfer.
> */
> @@ -1547,10 +1668,18 @@ omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
> return 0;
> }
>
> - ret = omap_hsmmc_setup_dma_transfer(host, req);
> - if (ret != 0) {
> - dev_err(mmc_dev(host->mmc), "MMC start dma failure\n");
> - return ret;
> + if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA) {
> + ret = omap_hsmmc_setup_adma_transfer(host, req);
> + if (ret != 0) {
> + dev_err(mmc_dev(host->mmc), "MMC adma setup failed\n");
> + return ret;
> + }
> + } else {
> + ret = omap_hsmmc_setup_dma_transfer(host, req);
> + if (ret != 0) {
> + dev_err(mmc_dev(host->mmc), "MMC start dma failure\n");
> + return ret;

the error checking can go outside

> + }
> }
> return 0;

if (ret != 0)
dev_err(mmc_dev(host->mmc), "MMC start dma failure\n");
return ret;

if compiler complains about ret not beeing initialized
int rer = 0;

> }
> @@ -1560,11 +1689,18 @@ static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
> {
> struct omap_hsmmc_host *host = mmc_priv(mmc);
> struct mmc_data *data = mrq->data;
> + struct device *dev;
> + struct dma_chan *c;
>
> if (data->host_cookie) {
> - struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data);
> + if (!(host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA)) {
> + c = omap_hsmmc_get_dma_chan(host, mrq->data);
> + dev = c->device->dev;
> + } else {
> + dev = mmc_dev(mmc);
> + }
>
> - dma_unmap_sg(c->device->dev, data->sg, data->sg_len,
> + dma_unmap_sg(dev, data->sg, data->sg_len,
> omap_hsmmc_get_dma_dir(host, data));
> data->host_cookie = 0;
> }
> @@ -1574,13 +1710,15 @@ static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
> bool is_first_req)
> {
> struct omap_hsmmc_host *host = mmc_priv(mmc);
> + struct dma_chan *c = NULL;
>
> if (mrq->data->host_cookie) {
> mrq->data->host_cookie = 0;
> return ;
> }
>
> - struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data);
> + if (!(host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA))
> + c = omap_hsmmc_get_dma_chan(host, mrq->data);
>
> if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
> &host->next_data, c))
> @@ -1967,6 +2105,9 @@ static struct omap_hsmmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
> if (of_find_property(np, "ti,dual-volt", NULL))
> pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
>
> + if (of_find_property(np, "ti,use_adma", NULL))
> + pdata->controller_flags |= OMAP_HSMMC_USE_ADMA;
> +
> pdata->gpio_cd = -EINVAL;
> pdata->gpio_cod = -EINVAL;
> pdata->gpio_wp = -EINVAL;
> @@ -1992,6 +2133,84 @@ static inline struct omap_hsmmc_platform_data
> }
> #endif
>
> +static int omap_hsmmc_adma_init(struct omap_hsmmc_host *host)
> +{
> + struct mmc_host *mmc = host->mmc;
> +
> + host->adma_desc_table = dma_alloc_coherent(host->dev, mmc->max_segs + 1,
> + &host->adma_desc_table_addr,
> + GFP_KERNEL);
> + if (!host->adma_desc_table) {
> + dev_err(host->dev, "failed to allocate adma desc table\n");
> + return -ENOMEM;

Fall back to Slave DMA?

> + }
> +
> + return 0;
> +}
> +
> +static void omap_hsmmc_adma_exit(struct omap_hsmmc_host *host)
> +{
> + struct mmc_host *mmc = host->mmc;
> +
> + dma_free_coherent(host->dev, mmc->max_segs + 1,
> + host->adma_desc_table, host->adma_desc_table_addr);
> +}
> +
> +static int omap_hsmmc_dma_init(struct omap_hsmmc_host *host)
> +{
> + dma_cap_mask_t mask;
> + unsigned int tx_req, rx_req;
> + struct resource *res;
> + struct platform_device *pdev = to_platform_device(host->dev);
> +
> + dma_cap_zero(mask);
> + dma_cap_set(DMA_SLAVE, mask);
> +
> + if (!pdev->dev.of_node) {
> + res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
> + if (!res) {
> + dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
> + return -ENXIO;
> + }
> + tx_req = res->start;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
> + if (!res) {
> + dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
> + return -ENXIO;
> + }
> + rx_req = res->start;
> + }
> +
> + host->rx_chan =
> + dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
> + &rx_req, &pdev->dev, "rx");
> +
> + if (!host->rx_chan) {
> + dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel\n");
> + return -ENXIO;
> + }
> +
> + host->tx_chan =
> + dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
> + &tx_req, &pdev->dev, "tx");
> +
> + if (!host->tx_chan) {
> + dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel\n");
> + return -ENXIO;
> + }
> +
> + return 0;
> +}
> +
> +static void omap_hsmmc_dma_exit(struct omap_hsmmc_host *host)
> +{
> + if (host->tx_chan)
> + dma_release_channel(host->tx_chan);
> + if (host->rx_chan)
> + dma_release_channel(host->rx_chan);
> +}
> +
> static int omap_hsmmc_probe(struct platform_device *pdev)
> {
> struct omap_hsmmc_platform_data *pdata = pdev->dev.platform_data;
> @@ -2000,8 +2219,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> struct resource *res;
> int ret, irq;
> const struct of_device_id *match;
> - dma_cap_mask_t mask;
> - unsigned tx_req, rx_req;
> const struct omap_mmc_of_data *data;
> void __iomem *base;
>
> @@ -2114,7 +2331,10 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> mmc->max_blk_size = 512; /* Block Length at max can be 1024 */
> mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */
> mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
> - mmc->max_seg_size = mmc->max_req_size;
> + if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA)
> + mmc->max_seg_size = ADMA_MAX_LEN;
> + else
> + mmc->max_seg_size = mmc->max_req_size;
>
> mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
> MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
> @@ -2130,46 +2350,12 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
>
> omap_hsmmc_conf_bus_power(host);
>
> - if (!pdev->dev.of_node) {
> - res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
> - if (!res) {
> - dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
> - ret = -ENXIO;
> - goto err_irq;
> - }
> - tx_req = res->start;
> -
> - res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
> - if (!res) {
> - dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
> - ret = -ENXIO;
> - goto err_irq;
> - }
> - rx_req = res->start;
> - }
> -
> - dma_cap_zero(mask);
> - dma_cap_set(DMA_SLAVE, mask);
> -
> - host->rx_chan =
> - dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
> - &rx_req, &pdev->dev, "rx");
> -
> - if (!host->rx_chan) {
> - dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel\n");
> - ret = -ENXIO;
> - goto err_irq;
> - }
> -
> - host->tx_chan =
> - dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
> - &tx_req, &pdev->dev, "tx");
> -
> - if (!host->tx_chan) {
> - dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel\n");
> - ret = -ENXIO;
> + if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA)
> + ret = omap_hsmmc_adma_init(host);
> + else
> + ret = omap_hsmmc_dma_init(host);
> + if (ret)
> goto err_irq;
> - }
>
> /* Request IRQ for MMC operations */
> ret = devm_request_irq(&pdev->dev, host->irq, omap_hsmmc_irq, 0,
> @@ -2225,11 +2411,11 @@ err_slot_name:
> mmc_remove_host(mmc);
> err_irq:
> device_init_wakeup(&pdev->dev, false);
> - if (host->tx_chan)
> - dma_release_channel(host->tx_chan);
> - if (host->rx_chan)
> - dma_release_channel(host->rx_chan);
> pm_runtime_dont_use_autosuspend(host->dev);
> + if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA)
> + omap_hsmmc_adma_exit(host);
> + else
> + omap_hsmmc_dma_exit(host);
> pm_runtime_put_sync(host->dev);
> pm_runtime_disable(host->dev);
> if (host->dbclk)
> @@ -2248,8 +2434,10 @@ static int omap_hsmmc_remove(struct platform_device *pdev)
> pm_runtime_get_sync(host->dev);
> mmc_remove_host(host->mmc);
>
> - dma_release_channel(host->tx_chan);
> - dma_release_channel(host->rx_chan);
> + if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA)
> + omap_hsmmc_adma_exit(host);
> + else
> + omap_hsmmc_dma_exit(host);
>
> pm_runtime_dont_use_autosuspend(host->dev);
> pm_runtime_put_sync(host->dev);
> diff --git a/include/linux/platform_data/hsmmc-omap.h b/include/linux/platform_data/hsmmc-omap.h
> index 8e981be..e26013d 100644
> --- a/include/linux/platform_data/hsmmc-omap.h
> +++ b/include/linux/platform_data/hsmmc-omap.h
> @@ -27,6 +27,7 @@
> #define OMAP_HSMMC_SUPPORTS_DUAL_VOLT BIT(0)
> #define OMAP_HSMMC_BROKEN_MULTIBLOCK_READ BIT(1)
> #define OMAP_HSMMC_SWAKEUP_MISSING BIT(2)
> +#define OMAP_HSMMC_USE_ADMA BIT(3)
>
> struct omap_hsmmc_dev_attr {
> u8 flags;
>

--
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