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