Just for folks who are interested in testing CQE using RK3399 platforms. And This patch depends on the unmerged CQE support for mmc core which could be found here: http://www.spinics.net/lists/linux-mmc/msg44648.html Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> --- drivers/mmc/host/Kconfig | 1 + drivers/mmc/host/sdhci-of-arasan.c | 199 ++++++++++++++++++++++++++++++++++--- 2 files changed, 186 insertions(+), 14 deletions(-) diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 2242633..a14efcb 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -123,6 +123,7 @@ config MMC_SDHCI_OF_ARASAN depends on MMC_SDHCI_PLTFM depends on OF depends on COMMON_CLK + select MMC_CQHC help This selects the Arasan Secure Digital Host Controller Interface (SDHCI). This hardware is found e.g. in Xilinx' Zynq SoC. diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c index b13c0a7..02e198b 100644 --- a/drivers/mmc/host/sdhci-of-arasan.c +++ b/drivers/mmc/host/sdhci-of-arasan.c @@ -24,10 +24,13 @@ #include <linux/module.h> #include <linux/of_device.h> #include <linux/phy/phy.h> +#include <linux/pm_runtime.h> #include <linux/regmap.h> -#include "sdhci-pltfm.h" #include <linux/of.h> +#include "cqhci.h" +#include "sdhci-pltfm.h" + #define SDHCI_ARASAN_VENDOR_REGISTER 0x78 #define VENDOR_ENHANCED_STROBE BIT(0) @@ -89,7 +92,7 @@ struct sdhci_arasan_data { struct clk *clk_ahb; struct phy *phy; bool is_phy_on; - + bool has_cqe; struct clk_hw sdcardclk_hw; struct clk *sdcardclk; @@ -262,23 +265,70 @@ static int sdhci_arasan_voltage_switch(struct mmc_host *mmc, return -EINVAL; } -static struct sdhci_ops sdhci_arasan_ops = { +static u32 sdhci_arasan_cqhci_irq(struct sdhci_host *host, u32 intmask) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); + int cmd_error = 0; + int data_error = 0; + + if (!sdhci_arasan->has_cqe) + return 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 void sdhci_arasan_dumpregs(struct mmc_host *mmc) +{ + sdhci_dumpregs(mmc_priv(mmc)); +} + +static void sdhci_arasan_cqe_enable(struct mmc_host *mmc) +{ + struct sdhci_host *host = mmc_priv(mmc); + u32 reg; + + /* + * CQE gets stuck if it sees Buffer Read Enable bit set, which can be + * the case after tuning, so ensure the buffer is drained. + */ + 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_arasan_cqhci_ops = { + .enable = sdhci_arasan_cqe_enable, + .disable = sdhci_cqe_disable, + .dumpregs = sdhci_arasan_dumpregs, +}; + +static struct sdhci_ops sdhci_arasan_cqe_ops = { .set_clock = sdhci_arasan_set_clock, .get_max_clock = sdhci_pltfm_clk_get_max_clock, .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, .set_bus_width = sdhci_set_bus_width, .reset = sdhci_arasan_reset, .set_uhs_signaling = sdhci_set_uhs_signaling, + .irq = sdhci_arasan_cqhci_irq, }; -static struct sdhci_pltfm_data sdhci_arasan_pdata = { - .ops = &sdhci_arasan_ops, +static struct sdhci_pltfm_data sdhci_arasan_cqe_pdata = { + .ops = &sdhci_arasan_cqe_ops, .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN, }; -#ifdef CONFIG_PM_SLEEP /** * sdhci_arasan_suspend - Suspend method for the driver * @dev: Address of the device structure @@ -286,7 +336,7 @@ static int sdhci_arasan_voltage_switch(struct mmc_host *mmc, * * Put the device in a low power state. */ -static int sdhci_arasan_suspend(struct device *dev) +static int __maybe_unused sdhci_arasan_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct sdhci_host *host = platform_get_drvdata(pdev); @@ -297,6 +347,12 @@ static int sdhci_arasan_suspend(struct device *dev) if (host->tuning_mode != SDHCI_TUNING_MODE_3) mmc_retune_needed(host->mmc); + if (sdhci_arasan->has_cqe) { + ret = cqhci_suspend(host->mmc); + if (ret) + return ret; + } + ret = sdhci_suspend_host(host); if (ret) return ret; @@ -324,7 +380,7 @@ static int sdhci_arasan_suspend(struct device *dev) * * Resume operation after suspend */ -static int sdhci_arasan_resume(struct device *dev) +static int __maybe_unused sdhci_arasan_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct sdhci_host *host = platform_get_drvdata(pdev); @@ -353,12 +409,70 @@ static int sdhci_arasan_resume(struct device *dev) sdhci_arasan->is_phy_on = true; } - return sdhci_resume_host(host); + ret = sdhci_resume_host(host); + if (ret) { + dev_err(dev, "Cannot resume host.\n"); + return ret; + } + + if (sdhci_arasan->has_cqe) + return cqhci_resume(host->mmc); + + return 0; +} + +static int __maybe_unused sdhci_arasan_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct sdhci_host *host = platform_get_drvdata(pdev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); + int ret; + + if (sdhci_arasan->has_cqe) { + ret = cqhci_suspend(host->mmc); + if (ret) + return ret; + } + + ret = sdhci_runtime_suspend_host(host); + if (ret) + return ret; + + clk_disable_unprepare(pltfm_host->clk); + clk_disable_unprepare(sdhci_arasan->clk_ahb); + + return 0; +} + +static int __maybe_unused sdhci_arasan_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct sdhci_host *host = platform_get_drvdata(pdev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); + int ret; + + clk_prepare_enable(pltfm_host->clk); + clk_prepare_enable(sdhci_arasan->clk_ahb); + + ret = sdhci_runtime_resume_host(host); + if (ret) + return ret; + + if (sdhci_arasan->has_cqe) + return cqhci_resume(host->mmc); + + return 0; } -#endif /* ! CONFIG_PM_SLEEP */ -static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend, - sdhci_arasan_resume); +static const struct dev_pm_ops sdhci_arasan_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(sdhci_arasan_suspend, + sdhci_arasan_resume) + SET_RUNTIME_PM_OPS(sdhci_arasan_runtime_suspend, + sdhci_arasan_runtime_resume, + NULL) +}; static const struct of_device_id sdhci_arasan_of_match[] = { /* SoC-specific compatible strings w/ soc_ctl_map */ @@ -556,6 +670,49 @@ static void sdhci_arasan_unregister_sdclk(struct device *dev) of_clk_del_provider(dev->of_node); } +static int sdhci_arasan_add_host(struct sdhci_arasan_data *sdhci_arasan) +{ + struct sdhci_host *host = sdhci_arasan->host; + struct cqhci_host *cq_host; + bool dma64; + int ret; + + if (!sdhci_arasan->has_cqe) + return sdhci_add_host(host); + + ret = sdhci_setup_host(host); + if (ret) + return ret; + + cq_host = devm_kzalloc(host->mmc->parent, + sizeof(*cq_host), GFP_KERNEL); + if (!cq_host) { + ret = -ENOMEM; + goto cleanup; + } + + cq_host->mmio = host->ioaddr + 0x200; + cq_host->ops = &sdhci_arasan_cqhci_ops; + + dma64 = host->flags & SDHCI_USE_64_BIT_DMA; + if (dma64) + cq_host->caps |= CQHCI_TASK_DESC_SZ_128; + + 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_arasan_probe(struct platform_device *pdev) { int ret; @@ -567,8 +724,9 @@ static int sdhci_arasan_probe(struct platform_device *pdev) struct sdhci_arasan_data *sdhci_arasan; struct device_node *np = pdev->dev.of_node; - host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, + host = sdhci_pltfm_init(pdev, &sdhci_arasan_cqe_pdata, sizeof(*sdhci_arasan)); + if (IS_ERR(host)) return PTR_ERR(host); @@ -619,6 +777,12 @@ static int sdhci_arasan_probe(struct platform_device *pdev) goto clk_dis_ahb; } + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, 50); + pm_runtime_use_autosuspend(&pdev->dev); + sdhci_get_of_property(pdev); if (of_property_read_bool(np, "xlnx,fails-without-test-cd")) @@ -663,12 +827,15 @@ static int sdhci_arasan_probe(struct platform_device *pdev) sdhci_arasan_hs400_enhanced_strobe; host->mmc_host_ops.start_signal_voltage_switch = sdhci_arasan_voltage_switch; + sdhci_arasan->has_cqe = true; + host->mmc->caps2 |= MMC_CAP2_CQE; } - ret = sdhci_add_host(host); + ret = sdhci_arasan_add_host(sdhci_arasan); if (ret) goto err_add_host; + pm_runtime_put(&pdev->dev); return 0; err_add_host: @@ -677,6 +844,9 @@ static int sdhci_arasan_probe(struct platform_device *pdev) unreg_clk: sdhci_arasan_unregister_sdclk(&pdev->dev); clk_disable_all: + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_put_noidle(&pdev->dev); clk_disable_unprepare(clk_xin); clk_dis_ahb: clk_disable_unprepare(sdhci_arasan->clk_ahb); @@ -704,6 +874,7 @@ static int sdhci_arasan_remove(struct platform_device *pdev) ret = sdhci_pltfm_unregister(pdev); clk_disable_unprepare(clk_ahb); + pm_runtime_disable(&pdev->dev); return ret; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
