[PATCH 5/6] mmc: sdhci-brcmstb: Add support for Command Queuing (CQE)

Al Cooper
2020-01-13T21:08:06Z

The latest Arasan controller first used in the 7216 now supports
CQE so enable this feature.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
drivers/mmc/host/Kconfig | 1 +
drivers/mmc/host/sdhci-brcmstb.c | 140 +++++++++++++++++++++++++++++--
2 files changed, 133 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index d06b2dfe3c95..8897de30959a 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -990,6 +990,7 @@ config MMC_SDHCI_BRCMSTB
tristate "Broadcom SDIO/SD/MMC support"
depends on ARCH_BRCMSTB || BMIPS_GENERIC
depends on MMC_SDHCI_PLTFM
+ select MMC_CQHCI
default y
help
This selects support for the SDIO/SD/MMC Host Controller on
diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
index 7ea426ba5cbc..2c4b6e7e3d9a 100644
--- a/drivers/mmc/host/sdhci-brcmstb.c
+++ b/drivers/mmc/host/sdhci-brcmstb.c
@@ -10,8 +10,10 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/bitops.h>
+#include <linux/delay.h>

#include "sdhci-pltfm.h"
+#include "cqhci.h"

#define SDHCI_VENDOR 0x78
#define SDHCI_VENDOR_ENHANCED_STRB 0x1
@@ -19,12 +21,16 @@
#define BRCMSTB_PRIV_FLAGS_NO_64BIT BIT(0)
#define BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT BIT(1)

+#define SDHCI_ARASAN_CQE_BASE_ADDR 0x200
+
struct sdhci_brcmstb_priv {
void __iomem *cfg_regs;
+ bool has_cqe;
};

struct brcmstb_match_priv {
void (*hs400es)(struct mmc_host *mmc, struct mmc_ios *ios);
+ struct sdhci_ops *ops;
unsigned int flags;
};

@@ -44,28 +50,74 @@ static void sdhci_brcmstb_hs400es(struct mmc_host *mmc, struct mmc_ios *ios)
writel(reg, host->ioaddr + SDHCI_VENDOR);
}

-static const struct sdhci_ops sdhci_brcmstb_ops = {
+static void sdhci_brcmstb_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+ u16 clk;
+
+ host->mmc->actual_clock = 0;
+
+ clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
+ sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+ if (clock == 0)
+ return;
+
+ sdhci_enable_clk(host, clk);
+}
+
+static void sdhci_brcmstb_dumpregs(struct mmc_host *mmc)
+{
+ sdhci_dumpregs(mmc_priv(mmc));
+}
+
+static void sdhci_brcmstb_cqe_enable(struct mmc_host *mmc)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ u32 reg;
+
+ reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
+ while (reg & SDHCI_DATA_AVAILABLE) {
+ sdhci_readl(host, SDHCI_BUFFER);
+ reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
+ }
+
+ sdhci_cqe_enable(mmc);
+}
+
+static const struct cqhci_host_ops sdhci_brcmstb_cqhci_ops = {
+ .enable = sdhci_brcmstb_cqe_enable,
+ .disable = sdhci_cqe_disable,
+ .dumpregs = sdhci_brcmstb_dumpregs,
+};
+
+static struct sdhci_ops sdhci_brcmstb_ops = {
.set_clock = sdhci_set_clock,
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};

-static const struct sdhci_pltfm_data sdhci_brcmstb_pdata = {
- .ops = &sdhci_brcmstb_ops,
+static struct sdhci_ops sdhci_brcmstb_ops_7216 = {
+ .set_clock = sdhci_brcmstb_set_clock,
+ .set_bus_width = sdhci_set_bus_width,
+ .reset = sdhci_reset,
+ .set_uhs_signaling = sdhci_set_uhs_signaling,
};

-static const struct brcmstb_match_priv match_priv_7425 = {
+static struct brcmstb_match_priv match_priv_7425 = {
.flags = BRCMSTB_PRIV_FLAGS_NO_64BIT |
BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT,
+ .ops = &sdhci_brcmstb_ops,
};

-static const struct brcmstb_match_priv match_priv_7445 = {
+static struct brcmstb_match_priv match_priv_7445 = {
.flags = BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT,
+ .ops = &sdhci_brcmstb_ops,
};

static const struct brcmstb_match_priv match_priv_7216 = {
.hs400es = sdhci_brcmstb_hs400es,
+ .ops = &sdhci_brcmstb_ops_7216,
};

static const struct of_device_id sdhci_brcm_of_match[] = {
@@ -75,20 +127,85 @@ static const struct of_device_id sdhci_brcm_of_match[] = {
{},
};

+static u32 sdhci_brcmstb_cqhci_irq(struct sdhci_host *host, u32 intmask)
+{
+ int cmd_error = 0;
+ int data_error = 0;
+
+ if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error))
+ return intmask;
+
+ cqhci_irq(host->mmc, intmask, cmd_error, data_error);
+
+ return 0;
+}
+
+static int sdhci_brcmstb_add_host(struct sdhci_host *host,
+ struct sdhci_brcmstb_priv *priv)
+{
+ struct cqhci_host *cq_host;
+ bool dma64;
+ int ret;
+
+ if (!priv->has_cqe)
+ return sdhci_add_host(host);
+
+ dev_dbg(mmc_dev(host->mmc), "CQE is enabled\n");
+ host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
+ ret = sdhci_setup_host(host);
+ if (ret)
+ return ret;
+
+ cq_host = devm_kzalloc(mmc_dev(host->mmc),
+ sizeof(*cq_host), GFP_KERNEL);
+ if (!cq_host) {
+ ret = -ENOMEM;
+ goto cleanup;
+ }
+
+ cq_host->mmio = host->ioaddr + SDHCI_ARASAN_CQE_BASE_ADDR;
+ cq_host->ops = &sdhci_brcmstb_cqhci_ops;
+
+ dma64 = host->flags & SDHCI_USE_64_BIT_DMA;
+ if (dma64) {
+ dev_dbg(mmc_dev(host->mmc), "Using 64 bit DMA\n");
+ cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
+ cq_host->quirks |= CQHCI_QUIRK_SHORT_TXFR_DESC_SZ;
+ }
+
+ ret = cqhci_init(cq_host, host->mmc, dma64);
+ if (ret)
+ goto cleanup;
+
+ ret = __sdhci_add_host(host);
+ if (ret)
+ goto cleanup;
+
+ return 0;
+
+cleanup:
+ sdhci_cleanup_host(host);
+ return ret;
+}
+
static int sdhci_brcmstb_probe(struct platform_device *pdev)
{
const struct brcmstb_match_priv *match_priv;
+ struct sdhci_pltfm_data brcmstb_pdata;
struct sdhci_pltfm_host *pltfm_host;
const struct of_device_id *match;
struct sdhci_brcmstb_priv *priv;
struct sdhci_host *host;
struct resource *iomem;
+ bool has_cqe = false;
struct clk *clk;
int res;

match = of_match_node(sdhci_brcm_of_match, pdev->dev.of_node);
match_priv = match->data;

+ dev_dbg(&pdev->dev, "Probe found match for %s\n", match->compatible);
+
clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
if (PTR_ERR(clk) == -EPROBE_DEFER)
@@ -100,7 +217,13 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
if (res)
return res;

- host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata,
+ memset(&brcmstb_pdata, 0, sizeof(brcmstb_pdata));
+ if (device_property_read_bool(&pdev->dev, "supports-cqe")) {
+ has_cqe = true;
+ match_priv->ops->irq = sdhci_brcmstb_cqhci_irq;
+ }
+ brcmstb_pdata.ops = match_priv->ops;
+ host = sdhci_pltfm_init(pdev, &brcmstb_pdata,
sizeof(struct sdhci_brcmstb_priv));
if (IS_ERR(host)) {
res = PTR_ERR(host);
@@ -109,6 +232,7 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)

pltfm_host = sdhci_priv(host);
priv = sdhci_pltfm_priv(pltfm_host);
+ priv->has_cqe = has_cqe;

/* Map in the non-standard CFG registers */
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
@@ -141,13 +265,13 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
host->caps &= ~SDHCI_CAN_64BIT;
host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
- SDHCI_SUPPORT_DDR50);
+ SDHCI_SUPPORT_DDR50);
host->quirks |= SDHCI_QUIRK_MISSING_CAPS;

if (match_priv->flags & BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT)
host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;

- res = sdhci_add_host(host);
+ res = sdhci_brcmstb_add_host(host, priv);
if (res)
goto err;

--
2.17.1