[v3,2/3] mmc: omap_hsmmc: Pin remux workaround to support SDIO interrupt on AM335x.

Message ID	1385386009-14981-3-git-send-email-afenkart@gmail.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-mmc-owner@kernel.org> From: Andreas Fenkart <afenkart@gmail.com> To: Chris Ball <cjb@laptop.org> Cc: Tony Lindgren <tony@atomide.com>, Grant Likely <grant.likely@secretlab.ca>, Felipe Balbi <balbi@ti.com>, Balaji T K <balajitk@ti.com>, zonque@gmail.com, linux-doc@vger.kernel.org, linux-mmc@vger.kernel.org, linux-omap@vger.kernel.org, Andreas Fenkart <afenkart@gmail.com> Subject: [PATCH v3 2/3] mmc: omap_hsmmc: Pin remux workaround to support SDIO interrupt on AM335x. Date: Mon, 25 Nov 2013 14:26:48 +0100 Message-Id: <1385386009-14981-3-git-send-email-afenkart@gmail.com> In-Reply-To: <1385386009-14981-1-git-send-email-afenkart@gmail.com> References: <1385386009-14981-1-git-send-email-afenkart@gmail.com> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk

diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt index 1136e6b..146f3ad 100644 --- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt +++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt @@ -21,8 +21,11 @@ ti,non-removable: non-removable slot (like eMMC) ti,needs-special-reset: Requires a special softreset sequence ti,needs-special-hs-handling: HSMMC IP needs special setting for handling High Speed ti,quirk-swakup-missing: SOC missing the swakeup line, will not detect -SDIO irq while in suspend. Fallback to polling. Affected chips are -am335x, +SDIO irq while in suspend. The workaround is to reconfigure the dat1 line as a +GPIO upon suspend. Beyond this option and the GPIO config, you also need to set +named pinctrl states "default", "active" and "idle ", see example below. The +MMC driver will then then toggle between default and idle during the runtime +Affected chips are am335x, ------ | PRCM | @@ -49,3 +52,24 @@ Example: vmmc-supply = <&vmmc>; /* phandle to regulator node */ ti,non-removable; }; + +[am335x with with gpio for sdio irq] + + mmc1_cirq_pin: pinmux_cirq_pin { + pinctrl-single,pins = < + 0x0f8 0x3f /* MMC0_DAT1 as GPIO2_28 */ + >; + }; + + mmc1: mmc@48060000 { + ti,non-removable; + bus-width = <4>; + vmmc-supply = <&ldo2_reg>; + vmmc_aux-supply = <&vmmc>; + ti,quirk-swakeup-missing; + pinctrl-names = "default", "active", "idle"; + pinctrl-0 = <&mmc1_pins>; + pinctrl-1 = <&mmc1_pins>; + pinctrl-2 = <&mmc1_cirq_pin>; + ti,cirq-gpio = <&gpio3 28 0>; + }; diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index 6b0ec55..c8c54f5 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -36,6 +36,7 @@ #include <linux/mmc/core.h> #include <linux/mmc/mmc.h> #include <linux/io.h> +#include <linux/irq.h> #include <linux/gpio.h> #include <linux/regulator/consumer.h> #include <linux/pinctrl/consumer.h> @@ -202,6 +203,7 @@ struct omap_hsmmc_host { u32 hctl; u32 capa; int irq; + int gpio_sdio_irq; int use_dma, dma_ch; struct dma_chan *tx_chan; struct dma_chan *rx_chan; @@ -213,11 +215,32 @@ struct omap_hsmmc_host { int req_in_progress; int flags; #define HSMMC_SDIO_IRQ_ENABLED (1 << 0) /* SDIO irq enabled */ +#define HSMMC_SWAKEUP_QUIRK (1 << 1) +#define HSMMC_CIRQ_GPIO_ENABLED (1 << 2) struct omap_hsmmc_next next_data; + struct pinctrl *pinctrl; + struct pinctrl_state *fixed, *active, *idle; struct omap_mmc_platform_data *pdata; }; +static irqreturn_t omap_hsmmc_cirq(int irq, void *dev_id) +{ + struct omap_hsmmc_host *host = dev_id; + unsigned long flags; + + spin_lock_irqsave(&host->irq_lock, flags); + if (host->flags & HSMMC_CIRQ_GPIO_ENABLED) { + disable_irq_nosync(host->gpio_sdio_irq); + host->flags &= ~HSMMC_CIRQ_GPIO_ENABLED; + } + spin_unlock_irqrestore(&host->irq_lock, flags); + + pm_request_resume(host->dev); /* no use counter */ + + return IRQ_HANDLED; +} + static int omap_hsmmc_card_detect(struct device *dev, int slot) { struct omap_hsmmc_host *host = dev_get_drvdata(dev); @@ -452,10 +475,23 @@ static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata) } else pdata->slots[0].gpio_wp = -EINVAL; + if (gpio_is_valid(pdata->slots[0].gpio_cirq)) { + ret = gpio_request_one(pdata->slots[0].gpio_cirq, GPIOF_DIR_IN, + "sdio_cirq"); + if (ret) + goto err_free_ro; + + } else { + pdata->slots[0].gpio_cirq = -EINVAL; + } + + return 0; +err_free_ro: + if (gpio_is_valid(pdata->slots[0].gpio_wp)) err_free_wp: - gpio_free(pdata->slots[0].gpio_wp); + gpio_free(pdata->slots[0].gpio_wp); err_free_cd: if (gpio_is_valid(pdata->slots[0].switch_pin)) err_free_sp: @@ -469,6 +505,69 @@ static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata) gpio_free(pdata->slots[0].gpio_wp); if (gpio_is_valid(pdata->slots[0].switch_pin)) gpio_free(pdata->slots[0].switch_pin); + if (gpio_is_valid(pdata->slots[0].gpio_cirq)) + gpio_free(pdata->slots[0].gpio_cirq); +} + +static int omap_hsmmc_pin_init(struct omap_hsmmc_host *host) +{ + int ret; + + host->pinctrl = devm_pinctrl_get(host->dev); + if (IS_ERR(host->pinctrl)) { + dev_dbg(host->dev, "no pinctrl handle\n"); + ret = 0; + goto out; + } + + host->fixed = pinctrl_lookup_state(host->pinctrl, + PINCTRL_STATE_DEFAULT); + if (IS_ERR(host->fixed)) { + dev_dbg(host->dev, + "pins are not configured from the driver\n"); + host->fixed = NULL; + ret = 0; + goto out; + } + + ret = pinctrl_select_state(host->pinctrl, host->fixed); + if (ret < 0) + goto err; + + /* For most cases we don't have wake-ups, and exit after this */ + host->active = pinctrl_lookup_state(host->pinctrl, "active"); + if (IS_ERR(host->active)) { + ret = PTR_ERR(host->active); + host->active = NULL; + return 0; + } + + host->idle = pinctrl_lookup_state(host->pinctrl, + PINCTRL_STATE_IDLE); + if (IS_ERR(host->idle)) { + ret = PTR_ERR(host->idle); + host->idle = NULL; + goto err; + } + + /* Let's make sure the active and idle states work */ + ret = pinctrl_select_state(host->pinctrl, host->idle); + if (ret < 0) + goto err; + + ret = pinctrl_select_state(host->pinctrl, host->active); + if (ret < 0) + goto err; + + dev_info(mmc_dev(host->mmc), "pins configured for wake-up events\n"); + + return 0; + +err: + dev_err(mmc_dev(host->mmc), "pins configuration error: %i\n", ret); + +out: + return ret; } /* @@ -1791,6 +1890,7 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev) pdata->nr_slots = 1; pdata->slots[0].switch_pin = cd_gpio; pdata->slots[0].gpio_wp = wp_gpio; + pdata->slots[0].gpio_cirq = of_get_named_gpio(np, "ti,cirq-gpio", 0); if (of_find_property(np, "ti,non-removable", NULL)) { pdata->slots[0].nonremovable = true; @@ -1837,7 +1937,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev) const struct of_device_id *match; dma_cap_mask_t mask; unsigned tx_req, rx_req; - struct pinctrl *pinctrl; match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev); if (match) { @@ -1875,7 +1974,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev) ret = omap_hsmmc_gpio_init(pdata); if (ret) - goto err; + goto err_gpio; mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev); if (!mmc) { @@ -2068,10 +2167,27 @@ static int omap_hsmmc_probe(struct platform_device *pdev) omap_hsmmc_disable_irq(host); - pinctrl = devm_pinctrl_get_select_default(&pdev->dev); - if (IS_ERR(pinctrl)) - dev_warn(&pdev->dev, - "pins are not configured from the driver\n"); + ret = omap_hsmmc_pin_init(host); + if (ret) + goto err_pinctrl_state; + + if (mmc_slot(host).gpio_cirq != -EINVAL) { + ret = gpio_to_irq(mmc_slot(host).gpio_cirq); + if (ret < 0) + goto err_irq_sdio; + host->gpio_sdio_irq = ret; + + /* prevent auto-enabling of IRQ */ + irq_set_status_flags(host->gpio_sdio_irq, IRQ_NOAUTOEN); + ret = request_irq(host->gpio_sdio_irq, omap_hsmmc_cirq, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + mmc_hostname(mmc), host); + if (ret) { + dev_dbg(mmc_dev(host->mmc), + "Unable to grab MMC SDIO IRQ\n"); + goto err_irq_sdio; + } + } /* * For now, only support SDIO interrupt if we are booted with @@ -2084,8 +2200,14 @@ static int omap_hsmmc_probe(struct platform_device *pdev) mmc->caps |= MMC_CAP_SDIO_IRQ; if (of_find_property(host->dev->of_node, "ti,quirk-swakeup-missing", NULL)) { - /* no wakeup from deeper power states, use polling */ - mmc->caps &= ~MMC_CAP_SDIO_IRQ; + /* use GPIO to wakeup from deeper power states */ + if (!host->idle || !host->gpio_sdio_irq) { + dev_err(mmc_dev(host->mmc), + "Missing GPIO config or pinctrl idle state\n"); + goto err_irq_sdio; + } + + host->flags |= HSMMC_SWAKEUP_QUIRK; } } @@ -2113,7 +2235,13 @@ static int omap_hsmmc_probe(struct platform_device *pdev) err_slot_name: mmc_remove_host(mmc); - free_irq(mmc_slot(host).card_detect_irq, host); +err_irq_sdio: + if (host->gpio_sdio_irq) + free_irq(host->gpio_sdio_irq, host); +err_pinctrl_state: + devm_pinctrl_put(host->pinctrl); + if ((mmc_slot(host).card_detect_irq)) + free_irq(mmc_slot(host).card_detect_irq, host); err_irq_cd: if (host->use_reg) omap_hsmmc_reg_put(host); @@ -2139,7 +2267,7 @@ err1: mmc_free_host(mmc); err_alloc: omap_hsmmc_gpio_free(pdata); -err: +err_gpio: res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (res) release_mem_region(res->start, resource_size(res)); @@ -2158,13 +2286,15 @@ static int omap_hsmmc_remove(struct platform_device *pdev) if (host->pdata->cleanup) host->pdata->cleanup(&pdev->dev); free_irq(host->irq, host); + if ((host->gpio_sdio_irq)) + free_irq(host->gpio_sdio_irq, host); if (mmc_slot(host).card_detect_irq) free_irq(mmc_slot(host).card_detect_irq, host); - if (host->tx_chan) dma_release_channel(host->tx_chan); if (host->rx_chan) dma_release_channel(host->rx_chan); + devm_pinctrl_put(host->pinctrl); pm_runtime_put_sync(host->dev); pm_runtime_disable(host->dev); @@ -2231,6 +2361,9 @@ static int omap_hsmmc_suspend(struct device *dev) OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP); } + if (host->flags & HSMMC_SWAKEUP_QUIRK) + disable_irq(host->gpio_sdio_irq); + if (host->dbclk) clk_disable_unprepare(host->dbclk); @@ -2268,6 +2401,9 @@ static int omap_hsmmc_resume(struct device *dev) if (ret == 0) host->suspended = 0; + if (host->flags & HSMMC_SWAKEUP_QUIRK) + enable_irq(host->gpio_sdio_irq); + pm_runtime_mark_last_busy(host->dev); pm_runtime_put_autosuspend(host->dev); @@ -2285,23 +2421,61 @@ static int omap_hsmmc_resume(struct device *dev) static int omap_hsmmc_runtime_suspend(struct device *dev) { struct omap_hsmmc_host *host; + unsigned long flags; + int ret = 0; host = platform_get_drvdata(to_platform_device(dev)); omap_hsmmc_context_save(host); dev_dbg(dev, "disabled\n"); - return 0; + if (host->flags & HSMMC_SWAKEUP_QUIRK) { + OMAP_HSMMC_WRITE(host->base, ISE, 0); + OMAP_HSMMC_WRITE(host->base, IE, 0); + OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); + + ret = pinctrl_select_state(host->pinctrl, host->idle); + if (ret < 0) + dev_warn(mmc_dev(host->mmc), "Unable to select idle pinmux\n"); + + spin_lock_irqsave(&host->irq_lock, flags); + if (host->flags & HSMMC_SDIO_IRQ_ENABLED) { + enable_irq(host->gpio_sdio_irq); + host->flags |= HSMMC_CIRQ_GPIO_ENABLED; + } + spin_unlock_irqrestore(&host->irq_lock, flags); + } + + return ret; } static int omap_hsmmc_runtime_resume(struct device *dev) { struct omap_hsmmc_host *host; + unsigned long flags; + int ret = 0; host = platform_get_drvdata(to_platform_device(dev)); omap_hsmmc_context_restore(host); dev_dbg(dev, "enabled\n"); - return 0; + if (host->flags & HSMMC_SWAKEUP_QUIRK) { + + spin_lock_irqsave(&host->irq_lock, flags); + if (host->flags & HSMMC_CIRQ_GPIO_ENABLED) { + disable_irq_nosync(host->gpio_sdio_irq); + host->flags &= ~HSMMC_CIRQ_GPIO_ENABLED; + } + spin_unlock_irqrestore(&host->irq_lock, flags); + + ret = pinctrl_select_state(host->pinctrl, host->active); + if (ret < 0) + dev_warn(mmc_dev(host->mmc), "Unable to select active pinmux\n"); + + OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); + OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN); + OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN); + } + return ret; } static struct dev_pm_ops omap_hsmmc_dev_pm_ops = { diff --git a/include/linux/platform_data/mmc-omap.h b/include/linux/platform_data/mmc-omap.h index 2bf1b30..dc8337f 100644 --- a/include/linux/platform_data/mmc-omap.h +++ b/include/linux/platform_data/mmc-omap.h @@ -115,6 +115,7 @@ struct omap_mmc_platform_data { int switch_pin; /* gpio (card detect) */ int gpio_wp; /* gpio (write protect) */ + int gpio_cirq; /* gpio (card irq) */ int (*set_bus_mode)(struct device *dev, int slot, int bus_mode); int (*set_power)(struct device *dev, int slot,

[v3,2/3] mmc: omap_hsmmc: Pin remux workaround to support SDIO interrupt on AM335x.

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