288 строки
6.3 KiB
C
288 строки
6.3 KiB
C
/*
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* Copyright 2012 Freescale Semiconductor, Inc.
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include "ci_hdrc_imx.h"
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#define MX25_USB_PHY_CTRL_OFFSET 0x08
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#define MX25_BM_EXTERNAL_VBUS_DIVIDER BIT(23)
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#define MX27_H1_PM_BIT BIT(8)
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#define MX27_H2_PM_BIT BIT(16)
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#define MX27_OTG_PM_BIT BIT(24)
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#define MX53_USB_OTG_PHY_CTRL_0_OFFSET 0x08
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#define MX53_USB_UH2_CTRL_OFFSET 0x14
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#define MX53_USB_UH3_CTRL_OFFSET 0x18
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#define MX53_BM_OVER_CUR_DIS_H1 BIT(5)
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#define MX53_BM_OVER_CUR_DIS_OTG BIT(8)
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#define MX53_BM_OVER_CUR_DIS_UHx BIT(30)
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#define MX6_BM_OVER_CUR_DIS BIT(7)
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struct usbmisc_ops {
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/* It's called once when probe a usb device */
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int (*init)(struct imx_usbmisc_data *data);
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/* It's called once after adding a usb device */
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int (*post)(struct imx_usbmisc_data *data);
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};
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struct imx_usbmisc {
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void __iomem *base;
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spinlock_t lock;
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struct clk *clk;
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const struct usbmisc_ops *ops;
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};
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static struct imx_usbmisc *usbmisc;
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static int usbmisc_imx25_post(struct imx_usbmisc_data *data)
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{
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void __iomem *reg;
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unsigned long flags;
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u32 val;
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if (data->index > 2)
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return -EINVAL;
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reg = usbmisc->base + MX25_USB_PHY_CTRL_OFFSET;
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if (data->evdo) {
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spin_lock_irqsave(&usbmisc->lock, flags);
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val = readl(reg);
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writel(val | MX25_BM_EXTERNAL_VBUS_DIVIDER, reg);
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spin_unlock_irqrestore(&usbmisc->lock, flags);
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usleep_range(5000, 10000); /* needed to stabilize voltage */
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}
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return 0;
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}
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static int usbmisc_imx27_init(struct imx_usbmisc_data *data)
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{
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unsigned long flags;
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u32 val;
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switch (data->index) {
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case 0:
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val = MX27_OTG_PM_BIT;
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break;
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case 1:
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val = MX27_H1_PM_BIT;
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break;
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case 2:
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val = MX27_H2_PM_BIT;
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break;
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default:
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return -EINVAL;
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};
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spin_lock_irqsave(&usbmisc->lock, flags);
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if (data->disable_oc)
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val = readl(usbmisc->base) | val;
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else
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val = readl(usbmisc->base) & ~val;
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writel(val, usbmisc->base);
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spin_unlock_irqrestore(&usbmisc->lock, flags);
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return 0;
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}
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static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
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{
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void __iomem *reg = NULL;
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unsigned long flags;
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u32 val = 0;
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if (data->index > 3)
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return -EINVAL;
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if (data->disable_oc) {
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spin_lock_irqsave(&usbmisc->lock, flags);
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switch (data->index) {
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case 0:
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reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
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val = readl(reg) | MX53_BM_OVER_CUR_DIS_OTG;
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break;
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case 1:
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reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
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val = readl(reg) | MX53_BM_OVER_CUR_DIS_H1;
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break;
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case 2:
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reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
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val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
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break;
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case 3:
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reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
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val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
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break;
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}
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if (reg && val)
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writel(val, reg);
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spin_unlock_irqrestore(&usbmisc->lock, flags);
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}
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return 0;
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}
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static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
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{
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unsigned long flags;
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u32 reg;
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if (data->index > 3)
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return -EINVAL;
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if (data->disable_oc) {
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spin_lock_irqsave(&usbmisc->lock, flags);
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reg = readl(usbmisc->base + data->index * 4);
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writel(reg | MX6_BM_OVER_CUR_DIS,
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usbmisc->base + data->index * 4);
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spin_unlock_irqrestore(&usbmisc->lock, flags);
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}
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return 0;
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}
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static const struct usbmisc_ops imx25_usbmisc_ops = {
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.post = usbmisc_imx25_post,
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};
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static const struct usbmisc_ops imx27_usbmisc_ops = {
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.init = usbmisc_imx27_init,
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};
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static const struct usbmisc_ops imx53_usbmisc_ops = {
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.init = usbmisc_imx53_init,
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};
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static const struct usbmisc_ops imx6q_usbmisc_ops = {
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.init = usbmisc_imx6q_init,
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};
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int imx_usbmisc_init(struct imx_usbmisc_data *data)
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{
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if (!usbmisc)
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return -EPROBE_DEFER;
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if (!usbmisc->ops->init)
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return 0;
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return usbmisc->ops->init(data);
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}
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EXPORT_SYMBOL_GPL(imx_usbmisc_init);
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int imx_usbmisc_init_post(struct imx_usbmisc_data *data)
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{
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if (!usbmisc)
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return -EPROBE_DEFER;
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if (!usbmisc->ops->post)
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return 0;
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return usbmisc->ops->post(data);
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}
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EXPORT_SYMBOL_GPL(imx_usbmisc_init_post);
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static const struct of_device_id usbmisc_imx_dt_ids[] = {
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{
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.compatible = "fsl,imx25-usbmisc",
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.data = &imx25_usbmisc_ops,
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},
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{
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.compatible = "fsl,imx27-usbmisc",
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.data = &imx27_usbmisc_ops,
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},
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{
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.compatible = "fsl,imx51-usbmisc",
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.data = &imx53_usbmisc_ops,
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},
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{
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.compatible = "fsl,imx53-usbmisc",
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.data = &imx53_usbmisc_ops,
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},
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{
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.compatible = "fsl,imx6q-usbmisc",
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.data = &imx6q_usbmisc_ops,
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},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);
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static int usbmisc_imx_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct imx_usbmisc *data;
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int ret;
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struct of_device_id *tmp_dev;
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if (usbmisc)
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return -EBUSY;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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spin_lock_init(&data->lock);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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data->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(data->base))
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return PTR_ERR(data->base);
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data->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(data->clk)) {
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dev_err(&pdev->dev,
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"failed to get clock, err=%ld\n", PTR_ERR(data->clk));
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return PTR_ERR(data->clk);
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}
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ret = clk_prepare_enable(data->clk);
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if (ret) {
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dev_err(&pdev->dev,
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"clk_prepare_enable failed, err=%d\n", ret);
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return ret;
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}
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tmp_dev = (struct of_device_id *)
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of_match_device(usbmisc_imx_dt_ids, &pdev->dev);
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data->ops = (const struct usbmisc_ops *)tmp_dev->data;
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usbmisc = data;
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return 0;
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}
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static int usbmisc_imx_remove(struct platform_device *pdev)
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{
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clk_disable_unprepare(usbmisc->clk);
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usbmisc = NULL;
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return 0;
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}
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static struct platform_driver usbmisc_imx_driver = {
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.probe = usbmisc_imx_probe,
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.remove = usbmisc_imx_remove,
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.driver = {
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.name = "usbmisc_imx",
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.owner = THIS_MODULE,
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.of_match_table = usbmisc_imx_dt_ids,
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},
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};
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module_platform_driver(usbmisc_imx_driver);
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MODULE_ALIAS("platform:usbmisc-imx");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("driver for imx usb non-core registers");
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MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
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