drivers/pinctrl/pinctrl-pxa3xx.c

   1 /*
   2  *  linux/drivers/pinctrl/pinctrl-pxa3xx.c
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License version 2 as
   6  *  publishhed by the Free Software Foundation.
   7  *
   8  *  Copyright (C) 2011, Marvell Technology Group Ltd.
   9  *
  10  *  Author: Haojian Zhuang <haojian.zhuang@marvell.com>
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/io.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/slab.h>
  19 #include "pinctrl-pxa3xx.h"
  20
  21 static struct pinctrl_gpio_range pxa3xx_pinctrl_gpio_range = {
  22         .name           = "PXA3xx GPIO",
  23         .id             = 0,
  24         .base           = 0,
  25         .pin_base       = 0,
  26 };
  27
  28 static int pxa3xx_get_groups_count(struct pinctrl_dev *pctrldev)
  29 {
  30         struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
  31
  32         return info->num_grps;
  33 }
  34
  35 static const char *pxa3xx_get_group_name(struct pinctrl_dev *pctrldev,
  36                                          unsigned selector)
  37 {
  38         struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
  39
  40         return info->grps[selector].name;
  41 }
  42
  43 static int pxa3xx_get_group_pins(struct pinctrl_dev *pctrldev,
  44                                  unsigned selector,
  45                                  const unsigned **pins,
  46                                  unsigned *num_pins)
  47 {
  48         struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
  49
  50         *pins = info->grps[selector].pins;
  51         *num_pins = info->grps[selector].npins;
  52         return 0;
  53 }
  54
  55 static struct pinctrl_ops pxa3xx_pctrl_ops = {
  56         .get_groups_count = pxa3xx_get_groups_count,
  57         .get_group_name = pxa3xx_get_group_name,
  58         .get_group_pins = pxa3xx_get_group_pins,
  59 };
  60
  61 static int pxa3xx_pmx_get_funcs_count(struct pinctrl_dev *pctrldev)
  62 {
  63         struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
  64
  65         return info->num_funcs;
  66 }
  67
  68 static const char *pxa3xx_pmx_get_func_name(struct pinctrl_dev *pctrldev,
  69                                             unsigned func)
  70 {
  71         struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
  72         return info->funcs[func].name;
  73 }
  74
  75 static int pxa3xx_pmx_get_groups(struct pinctrl_dev *pctrldev, unsigned func,
  76                                  const char * const **groups,
  77                                  unsigned * const num_groups)
  78 {
  79         struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
  80         *groups = info->funcs[func].groups;
  81         *num_groups = info->funcs[func].num_groups;
  82         return 0;
  83 }
  84
  85 /* Return function number. If failure, return negative value. */
  86 static int match_mux(struct pxa3xx_mfp_pin *mfp, unsigned mux)
  87 {
  88         int i;
  89         for (i = 0; i < PXA3xx_MAX_MUX; i++) {
  90                 if (mfp->func[i] == mux)
  91                         break;
  92         }
  93         if (i >= PXA3xx_MAX_MUX)
  94                 return -EINVAL;
  95         return i;
  96 }
  97
  98 /* check whether current pin configuration is valid. Negative for failure */
  99 static int match_group_mux(struct pxa3xx_pin_group *grp,
 100                            struct pxa3xx_pinmux_info *info,
 101                            unsigned mux)
 102 {
 103         int i, pin, ret = 0;
 104         for (i = 0; i < grp->npins; i++) {
 105                 pin = grp->pins[i];
 106                 ret = match_mux(&info->mfp[pin], mux);
 107                 if (ret < 0) {
 108                         dev_err(info->dev, "Can't find mux %d on pin%d\n",
 109                                 mux, pin);
 110                         break;
 111                 }
 112         }
 113         return ret;
 114 }
 115
 116 static int pxa3xx_pmx_enable(struct pinctrl_dev *pctrldev, unsigned func,
 117                              unsigned group)
 118 {
 119         struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
 120         struct pxa3xx_pin_group *pin_grp = &info->grps[group];
 121         unsigned int data;
 122         int i, mfpr, pin, pin_func;
 123
 124         if (!pin_grp->npins ||
 125                 (match_group_mux(pin_grp, info, pin_grp->mux) < 0)) {
 126                 dev_err(info->dev, "Failed to set the pin group: %d\n", group);
 127                 return -EINVAL;
 128         }
 129         for (i = 0; i < pin_grp->npins; i++) {
 130                 pin = pin_grp->pins[i];
 131                 pin_func = match_mux(&info->mfp[pin], pin_grp->mux);
 132                 mfpr = info->mfp[pin].mfpr;
 133                 data = readl_relaxed(info->virt_base + mfpr);
 134                 data &= ~MFPR_FUNC_MASK;
 135                 data |= pin_func;
 136                 writel_relaxed(data, info->virt_base + mfpr);
 137         }
 138         return 0;
 139 }
 140
 141 static int pxa3xx_pmx_request_gpio(struct pinctrl_dev *pctrldev,
 142                                    struct pinctrl_gpio_range *range,
 143                                    unsigned pin)
 144 {
 145         struct pxa3xx_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
 146         unsigned int data;
 147         int pin_func, mfpr;
 148
 149         pin_func = match_mux(&info->mfp[pin], PXA3xx_MUX_GPIO);
 150         if (pin_func < 0) {
 151                 dev_err(info->dev, "No GPIO function on pin%d (%s)\n",
 152                         pin, info->pads[pin].name);
 153                 return -EINVAL;
 154         }
 155         mfpr = info->mfp[pin].mfpr;
 156         /* write gpio function into mfpr register */
 157         data = readl_relaxed(info->virt_base + mfpr) & ~MFPR_FUNC_MASK;
 158         data |= pin_func;
 159         writel_relaxed(data, info->virt_base + mfpr);
 160         return 0;
 161 }
 162
 163 static struct pinmux_ops pxa3xx_pmx_ops = {
 164         .get_functions_count    = pxa3xx_pmx_get_funcs_count,
 165         .get_function_name      = pxa3xx_pmx_get_func_name,
 166         .get_function_groups    = pxa3xx_pmx_get_groups,
 167         .enable                 = pxa3xx_pmx_enable,
 168         .gpio_request_enable    = pxa3xx_pmx_request_gpio,
 169 };
 170
 171 int pxa3xx_pinctrl_register(struct platform_device *pdev,
 172                             struct pxa3xx_pinmux_info *info)
 173 {
 174         struct pinctrl_desc *desc;
 175         struct resource *res;
 176
 177         if (!info || !info->cputype)
 178                 return -EINVAL;
 179         desc = info->desc;
 180         desc->pins = info->pads;
 181         desc->npins = info->num_pads;
 182         desc->pctlops = &pxa3xx_pctrl_ops;
 183         desc->pmxops = &pxa3xx_pmx_ops;
 184         info->dev = &pdev->dev;
 185         pxa3xx_pinctrl_gpio_range.npins = info->num_gpio;
 186
 187         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 188         if (!res)
 189                 return -ENOENT;
 190         info->virt_base = devm_request_and_ioremap(&pdev->dev, res);
 191         if (!info->virt_base)
 192                 return -ENOMEM;
 193         info->pctrl = pinctrl_register(desc, &pdev->dev, info);
 194         if (!info->pctrl) {
 195                 dev_err(&pdev->dev, "failed to register PXA pinmux driver\n");
 196                 return -EINVAL;
 197         }
 198         pinctrl_add_gpio_range(info->pctrl, &pxa3xx_pinctrl_gpio_range);
 199         platform_set_drvdata(pdev, info);
 200         return 0;
 201 }
 202
 203 int pxa3xx_pinctrl_unregister(struct platform_device *pdev)
 204 {
 205         struct pxa3xx_pinmux_info *info = platform_get_drvdata(pdev);
 206
 207         pinctrl_unregister(info->pctrl);
 208         platform_set_drvdata(pdev, NULL);
 209         return 0;
 210 }
 211
 212 static int __init pxa3xx_pinctrl_init(void)
 213 {
 214         pr_info("pxa3xx-pinctrl: PXA3xx pinctrl driver initializing\n");
 215         return 0;
 216 }
 217 core_initcall_sync(pxa3xx_pinctrl_init);
 218
 219 static void __exit pxa3xx_pinctrl_exit(void)
 220 {
 221 }
 222 module_exit(pxa3xx_pinctrl_exit);
 223
 224 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 225 MODULE_DESCRIPTION("PXA3xx pin control driver");
 226 MODULE_LICENSE("GPL v2");