From 05986ba9b025ae7742744e1108bd59b1f6e8f443 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 14 Aug 2013 12:44:16 +0300 Subject: [PATCH] USB: chipidea: i.MX: simplify usbmisc The chipidea i.MX driver is split into two drivers. The ci_hdrc_imx driver handles the chipidea cores and the usbmisc_imx driver handles the noncore registers common to all chipidea cores (but SoC specific). Current flow is: - usbmisc sets an ops pointer in the ci_hdrc_imx driver during probe - ci_hdrc_imx checks if the pointer is valid during probe, if yes calls the functions in the ops pointer. - usbmisc_imx calls back into the ci_hdrc_imx driver to get additional data This is overly complicated and has problems if the drivers are compiled as modules. In this case the usbmisc_imx driver can be unloaded even if the ci_hdrc_imx driver still needs usbmisc functionality. This patch changes this by letting the ci_hdrc_imx driver calling functions from the usbmisc_imx driver. This way the symbol resolving during module load makes sure the ci_hdrc_imx driver depends on the usbmisc_imx driver. Also instead of letting the usbmisc_imx driver call back into the ci_hdrc_imx driver, pass the needed data in the first place. Signed-off-by: Sascha Hauer Acked-by: Peter Chen Signed-off-by: Alexander Shishkin Signed-off-by: Greg Kroah-Hartman --- drivers/usb/chipidea/ci_hdrc_imx.c | 71 +++++++++++++--------------- drivers/usb/chipidea/ci_hdrc_imx.h | 17 ++----- drivers/usb/chipidea/usbmisc_imx.c | 95 +++++++++++++++++--------------------- 3 files changed, 76 insertions(+), 107 deletions(-) diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c index cc53e63..74d998d 100644 --- a/drivers/usb/chipidea/ci_hdrc_imx.c +++ b/drivers/usb/chipidea/ci_hdrc_imx.c @@ -27,57 +27,48 @@ struct ci_hdrc_imx_data { struct usb_phy *phy; struct platform_device *ci_pdev; struct clk *clk; + struct imx_usbmisc_data *usbmisc_data; }; -static const struct usbmisc_ops *usbmisc_ops; - /* Common functions shared by usbmisc drivers */ -int usbmisc_set_ops(const struct usbmisc_ops *ops) -{ - if (usbmisc_ops) - return -EBUSY; - - usbmisc_ops = ops; - - return 0; -} -EXPORT_SYMBOL_GPL(usbmisc_set_ops); - -void usbmisc_unset_ops(const struct usbmisc_ops *ops) -{ - usbmisc_ops = NULL; -} -EXPORT_SYMBOL_GPL(usbmisc_unset_ops); - -int usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev) +static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev) { struct device_node *np = dev->of_node; struct of_phandle_args args; + struct imx_usbmisc_data *data; int ret; - usbdev->dev = dev; + /* + * In case the fsl,usbmisc property is not present this device doesn't + * need usbmisc. Return NULL (which is no error here) + */ + if (!of_get_property(np, "fsl,usbmisc", NULL)) + return NULL; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return ERR_PTR(-ENOMEM); ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells", 0, &args); if (ret) { dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n", ret); - memset(usbdev, 0, sizeof(*usbdev)); - return ret; + return ERR_PTR(ret); } - usbdev->index = args.args[0]; + + data->index = args.args[0]; of_node_put(args.np); if (of_find_property(np, "disable-over-current", NULL)) - usbdev->disable_oc = 1; + data->disable_oc = 1; if (of_find_property(np, "external-vbus-divider", NULL)) - usbdev->evdo = 1; + data->evdo = 1; - return 0; + return data; } -EXPORT_SYMBOL_GPL(usbmisc_get_init_data); /* End of common functions shared by usbmisc drivers*/ @@ -92,16 +83,16 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev) }; int ret; - if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL) - && !usbmisc_ops) - return -EPROBE_DEFER; - data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); if (!data) { dev_err(&pdev->dev, "Failed to allocate ci_hdrc-imx data!\n"); return -ENOMEM; } + data->usbmisc_data = usbmisc_get_init_data(&pdev->dev); + if (IS_ERR(data->usbmisc_data)) + return PTR_ERR(data->usbmisc_data); + data->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(data->clk)) { dev_err(&pdev->dev, @@ -135,11 +126,11 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev) if (!pdev->dev.coherent_dma_mask) pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); - if (usbmisc_ops && usbmisc_ops->init) { - ret = usbmisc_ops->init(&pdev->dev); + if (data->usbmisc_data) { + ret = imx_usbmisc_init(data->usbmisc_data); if (ret) { - dev_err(&pdev->dev, - "usbmisc init failed, ret=%d\n", ret); + dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n", + ret); goto err_clk; } } @@ -155,11 +146,11 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev) goto err_clk; } - if (usbmisc_ops && usbmisc_ops->post) { - ret = usbmisc_ops->post(&pdev->dev); + if (data->usbmisc_data) { + ret = imx_usbmisc_init_post(data->usbmisc_data); if (ret) { - dev_err(&pdev->dev, - "usbmisc post failed, ret=%d\n", ret); + dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n", + ret); goto disable_device; } } diff --git a/drivers/usb/chipidea/ci_hdrc_imx.h b/drivers/usb/chipidea/ci_hdrc_imx.h index 550bfa4..c727159 100644 --- a/drivers/usb/chipidea/ci_hdrc_imx.h +++ b/drivers/usb/chipidea/ci_hdrc_imx.h @@ -9,23 +9,12 @@ * http://www.gnu.org/copyleft/gpl.html */ -/* Used to set SoC specific callbacks */ -struct usbmisc_ops { - /* It's called once when probe a usb device */ - int (*init)(struct device *dev); - /* It's called once after adding a usb device */ - int (*post)(struct device *dev); -}; - -struct usbmisc_usb_device { - struct device *dev; /* usb controller device */ +struct imx_usbmisc_data { int index; unsigned int disable_oc:1; /* over current detect disabled */ unsigned int evdo:1; /* set external vbus divider option */ }; -int usbmisc_set_ops(const struct usbmisc_ops *ops); -void usbmisc_unset_ops(const struct usbmisc_ops *ops); -int -usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev); +int imx_usbmisc_init(struct imx_usbmisc_data *); +int imx_usbmisc_init_post(struct imx_usbmisc_data *); diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c index ac5a461..8a1094b 100644 --- a/drivers/usb/chipidea/usbmisc_imx.c +++ b/drivers/usb/chipidea/usbmisc_imx.c @@ -18,8 +18,6 @@ #include "ci_hdrc_imx.h" -#define USB_DEV_MAX 4 - #define MX25_USB_PHY_CTRL_OFFSET 0x08 #define MX25_BM_EXTERNAL_VBUS_DIVIDER BIT(23) @@ -32,51 +30,34 @@ #define MX6_BM_OVER_CUR_DIS BIT(7) +struct usbmisc_ops { + /* It's called once when probe a usb device */ + int (*init)(struct imx_usbmisc_data *data); + /* It's called once after adding a usb device */ + int (*post)(struct imx_usbmisc_data *data); +}; + struct imx_usbmisc { void __iomem *base; spinlock_t lock; struct clk *clk; - struct usbmisc_usb_device usbdev[USB_DEV_MAX]; const struct usbmisc_ops *ops; }; static struct imx_usbmisc *usbmisc; -static struct usbmisc_usb_device *get_usbdev(struct device *dev) -{ - int i, ret; - - for (i = 0; i < USB_DEV_MAX; i++) { - if (usbmisc->usbdev[i].dev == dev) - return &usbmisc->usbdev[i]; - else if (!usbmisc->usbdev[i].dev) - break; - } - - if (i >= USB_DEV_MAX) - return ERR_PTR(-EBUSY); - - ret = usbmisc_get_init_data(dev, &usbmisc->usbdev[i]); - if (ret) - return ERR_PTR(ret); - - return &usbmisc->usbdev[i]; -} - -static int usbmisc_imx25_post(struct device *dev) +static int usbmisc_imx25_post(struct imx_usbmisc_data *data) { - struct usbmisc_usb_device *usbdev; void __iomem *reg; unsigned long flags; u32 val; - usbdev = get_usbdev(dev); - if (IS_ERR(usbdev)) - return PTR_ERR(usbdev); + if (data->index > 2) + return -EINVAL; reg = usbmisc->base + MX25_USB_PHY_CTRL_OFFSET; - if (usbdev->evdo) { + if (data->evdo) { spin_lock_irqsave(&usbmisc->lock, flags); val = readl(reg); writel(val | MX25_BM_EXTERNAL_VBUS_DIVIDER, reg); @@ -87,20 +68,18 @@ static int usbmisc_imx25_post(struct device *dev) return 0; } -static int usbmisc_imx53_init(struct device *dev) +static int usbmisc_imx53_init(struct imx_usbmisc_data *data) { - struct usbmisc_usb_device *usbdev; void __iomem *reg = NULL; unsigned long flags; u32 val = 0; - usbdev = get_usbdev(dev); - if (IS_ERR(usbdev)) - return PTR_ERR(usbdev); + if (data->index > 3) + return -EINVAL; - if (usbdev->disable_oc) { + if (data->disable_oc) { spin_lock_irqsave(&usbmisc->lock, flags); - switch (usbdev->index) { + switch (data->index) { case 0: reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET; val = readl(reg) | MX53_BM_OVER_CUR_DIS_OTG; @@ -126,22 +105,19 @@ static int usbmisc_imx53_init(struct device *dev) return 0; } -static int usbmisc_imx6q_init(struct device *dev) +static int usbmisc_imx6q_init(struct imx_usbmisc_data *data) { - - struct usbmisc_usb_device *usbdev; unsigned long flags; u32 reg; - usbdev = get_usbdev(dev); - if (IS_ERR(usbdev)) - return PTR_ERR(usbdev); + if (data->index > 3) + return -EINVAL; - if (usbdev->disable_oc) { + if (data->disable_oc) { spin_lock_irqsave(&usbmisc->lock, flags); - reg = readl(usbmisc->base + usbdev->index * 4); + reg = readl(usbmisc->base + data->index * 4); writel(reg | MX6_BM_OVER_CUR_DIS, - usbmisc->base + usbdev->index * 4); + usbmisc->base + data->index * 4); spin_unlock_irqrestore(&usbmisc->lock, flags); } @@ -160,6 +136,26 @@ static const struct usbmisc_ops imx6q_usbmisc_ops = { .init = usbmisc_imx6q_init, }; +int imx_usbmisc_init(struct imx_usbmisc_data *data) +{ + if (!usbmisc) + return -EPROBE_DEFER; + if (!usbmisc->ops->init) + return 0; + return usbmisc->ops->init(data); +} +EXPORT_SYMBOL_GPL(imx_usbmisc_init); + +int imx_usbmisc_init_post(struct imx_usbmisc_data *data) +{ + if (!usbmisc) + return -EPROBE_DEFER; + if (!usbmisc->ops->post) + return 0; + return usbmisc->ops->post(data); +} +EXPORT_SYMBOL_GPL(imx_usbmisc_init_post); + static const struct of_device_id usbmisc_imx_dt_ids[] = { { .compatible = "fsl,imx25-usbmisc", @@ -216,19 +212,12 @@ static int usbmisc_imx_probe(struct platform_device *pdev) of_match_device(usbmisc_imx_dt_ids, &pdev->dev); data->ops = (const struct usbmisc_ops *)tmp_dev->data; usbmisc = data; - ret = usbmisc_set_ops(data->ops); - if (ret) { - usbmisc = NULL; - clk_disable_unprepare(data->clk); - return ret; - } return 0; } static int usbmisc_imx_remove(struct platform_device *pdev) { - usbmisc_unset_ops(usbmisc->ops); clk_disable_unprepare(usbmisc->clk); usbmisc = NULL; return 0; -- 2.7.4