drivers/usb/chipidea/usbmisc_imx.c

   1 /*
   2  * Copyright 2012 Freescale Semiconductor, Inc.
   3  *
   4  * The code contained herein is licensed under the GNU General Public
   5  * License. You may obtain a copy of the GNU General Public License
   6  * Version 2 or later at the following locations:
   7  *
   8  * http://www.opensource.org/licenses/gpl-license.html
   9  * http://www.gnu.org/copyleft/gpl.html
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/clk.h>
  15 #include <linux/err.h>
  16 #include <linux/io.h>
  17 #include <linux/delay.h>
  18
  19 #include "ci_hdrc_imx.h"
  20
  21 #define MX25_USB_PHY_CTRL_OFFSET        0x08
  22 #define MX25_BM_EXTERNAL_VBUS_DIVIDER   BIT(23)
  23
  24 #define MX53_USB_OTG_PHY_CTRL_0_OFFSET  0x08
  25 #define MX53_USB_UH2_CTRL_OFFSET        0x14
  26 #define MX53_USB_UH3_CTRL_OFFSET        0x18
  27 #define MX53_BM_OVER_CUR_DIS_H1         BIT(5)
  28 #define MX53_BM_OVER_CUR_DIS_OTG        BIT(8)
  29 #define MX53_BM_OVER_CUR_DIS_UHx        BIT(30)
  30
  31 #define MX6_BM_OVER_CUR_DIS             BIT(7)
  32
  33 struct usbmisc_ops {
  34         /* It's called once when probe a usb device */
  35         int (*init)(struct imx_usbmisc_data *data);
  36         /* It's called once after adding a usb device */
  37         int (*post)(struct imx_usbmisc_data *data);
  38 };
  39
  40 struct imx_usbmisc {
  41         void __iomem *base;
  42         spinlock_t lock;
  43         struct clk *clk;
  44         const struct usbmisc_ops *ops;
  45 };
  46
  47 static struct imx_usbmisc *usbmisc;
  48
  49 static int usbmisc_imx25_post(struct imx_usbmisc_data *data)
  50 {
  51         void __iomem *reg;
  52         unsigned long flags;
  53         u32 val;
  54
  55         if (data->index > 2)
  56                 return -EINVAL;
  57
  58         reg = usbmisc->base + MX25_USB_PHY_CTRL_OFFSET;
  59
  60         if (data->evdo) {
  61                 spin_lock_irqsave(&usbmisc->lock, flags);
  62                 val = readl(reg);
  63                 writel(val | MX25_BM_EXTERNAL_VBUS_DIVIDER, reg);
  64                 spin_unlock_irqrestore(&usbmisc->lock, flags);
  65                 usleep_range(5000, 10000); /* needed to stabilize voltage */
  66         }
  67
  68         return 0;
  69 }
  70
  71 static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
  72 {
  73         void __iomem *reg = NULL;
  74         unsigned long flags;
  75         u32 val = 0;
  76
  77         if (data->index > 3)
  78                 return -EINVAL;
  79
  80         if (data->disable_oc) {
  81                 spin_lock_irqsave(&usbmisc->lock, flags);
  82                 switch (data->index) {
  83                 case 0:
  84                         reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
  85                         val = readl(reg) | MX53_BM_OVER_CUR_DIS_OTG;
  86                         break;
  87                 case 1:
  88                         reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
  89                         val = readl(reg) | MX53_BM_OVER_CUR_DIS_H1;
  90                         break;
  91                 case 2:
  92                         reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
  93                         val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
  94                         break;
  95                 case 3:
  96                         reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
  97                         val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
  98                         break;
  99                 }
 100                 if (reg && val)
 101                         writel(val, reg);
 102                 spin_unlock_irqrestore(&usbmisc->lock, flags);
 103         }
 104
 105         return 0;
 106 }
 107
 108 static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
 109 {
 110         unsigned long flags;
 111         u32 reg;
 112
 113         if (data->index > 3)
 114                 return -EINVAL;
 115
 116         if (data->disable_oc) {
 117                 spin_lock_irqsave(&usbmisc->lock, flags);
 118                 reg = readl(usbmisc->base + data->index * 4);
 119                 writel(reg | MX6_BM_OVER_CUR_DIS,
 120                         usbmisc->base + data->index * 4);
 121                 spin_unlock_irqrestore(&usbmisc->lock, flags);
 122         }
 123
 124         return 0;
 125 }
 126
 127 static const struct usbmisc_ops imx25_usbmisc_ops = {
 128         .post = usbmisc_imx25_post,
 129 };
 130
 131 static const struct usbmisc_ops imx53_usbmisc_ops = {
 132         .init = usbmisc_imx53_init,
 133 };
 134
 135 static const struct usbmisc_ops imx6q_usbmisc_ops = {
 136         .init = usbmisc_imx6q_init,
 137 };
 138
 139 int imx_usbmisc_init(struct imx_usbmisc_data *data)
 140 {
 141         if (!usbmisc)
 142                 return -EPROBE_DEFER;
 143         if (!usbmisc->ops->init)
 144                 return 0;
 145         return usbmisc->ops->init(data);
 146 }
 147 EXPORT_SYMBOL_GPL(imx_usbmisc_init);
 148
 149 int imx_usbmisc_init_post(struct imx_usbmisc_data *data)
 150 {
 151         if (!usbmisc)
 152                 return -EPROBE_DEFER;
 153         if (!usbmisc->ops->post)
 154                 return 0;
 155         return usbmisc->ops->post(data);
 156 }
 157 EXPORT_SYMBOL_GPL(imx_usbmisc_init_post);
 158
 159 static const struct of_device_id usbmisc_imx_dt_ids[] = {
 160         {
 161                 .compatible = "fsl,imx25-usbmisc",
 162                 .data = &imx25_usbmisc_ops,
 163         },
 164         {
 165                 .compatible = "fsl,imx53-usbmisc",
 166                 .data = &imx53_usbmisc_ops,
 167         },
 168         {
 169                 .compatible = "fsl,imx6q-usbmisc",
 170                 .data = &imx6q_usbmisc_ops,
 171         },
 172         { /* sentinel */ }
 173 };
 174 MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);
 175
 176 static int usbmisc_imx_probe(struct platform_device *pdev)
 177 {
 178         struct resource *res;
 179         struct imx_usbmisc *data;
 180         int ret;
 181         struct of_device_id *tmp_dev;
 182
 183         if (usbmisc)
 184                 return -EBUSY;
 185
 186         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 187         if (!data)
 188                 return -ENOMEM;
 189
 190         spin_lock_init(&data->lock);
 191
 192         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 193         data->base = devm_ioremap_resource(&pdev->dev, res);
 194         if (IS_ERR(data->base))
 195                 return PTR_ERR(data->base);
 196
 197         data->clk = devm_clk_get(&pdev->dev, NULL);
 198         if (IS_ERR(data->clk)) {
 199                 dev_err(&pdev->dev,
 200                         "failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 201                 return PTR_ERR(data->clk);
 202         }
 203
 204         ret = clk_prepare_enable(data->clk);
 205         if (ret) {
 206                 dev_err(&pdev->dev,
 207                         "clk_prepare_enable failed, err=%d\n", ret);
 208                 return ret;
 209         }
 210
 211         tmp_dev = (struct of_device_id *)
 212                 of_match_device(usbmisc_imx_dt_ids, &pdev->dev);
 213         data->ops = (const struct usbmisc_ops *)tmp_dev->data;
 214         usbmisc = data;
 215
 216         return 0;
 217 }
 218
 219 static int usbmisc_imx_remove(struct platform_device *pdev)
 220 {
 221         clk_disable_unprepare(usbmisc->clk);
 222         usbmisc = NULL;
 223         return 0;
 224 }
 225
 226 static struct platform_driver usbmisc_imx_driver = {
 227         .probe = usbmisc_imx_probe,
 228         .remove = usbmisc_imx_remove,
 229         .driver = {
 230                 .name = "usbmisc_imx",
 231                 .owner = THIS_MODULE,
 232                 .of_match_table = usbmisc_imx_dt_ids,
 233          },
 234 };
 235
 236 module_platform_driver(usbmisc_imx_driver);
 237
 238 MODULE_ALIAS("platform:usbmisc-imx");
 239 MODULE_LICENSE("GPL v2");
 240 MODULE_DESCRIPTION("driver for imx usb non-core registers");
 241 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");