drivers/pinctrl/pinctrl-at91-pio4.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Atmel PIO4 pinctrl driver
   4  *
   5  * Copyright (C) 2016 Atmel Corporation
   6  *               Wenyou.Yang <wenyou.yang@atmel.com>
   7  */
   8
   9 #include <common.h>
  10 #include <dm.h>
  11 #include <dm/pinctrl.h>
  12 #include <linux/bitops.h>
  13 #include <linux/io.h>
  14 #include <linux/err.h>
  15 #include <mach/atmel_pio4.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 /*
  20  * Warning:
  21  * In order to not introduce confusion between Atmel PIO groups and pinctrl
  22  * framework groups, Atmel PIO groups will be called banks.
  23  */
  24
  25 struct atmel_pio4_platdata {
  26         struct atmel_pio4_port *reg_base;
  27 };
  28
  29 static const struct pinconf_param conf_params[] = {
  30         { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
  31         { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
  32         { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
  33         { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
  34         { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
  35         { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
  36         { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
  37 };
  38
  39 static u32 atmel_pinctrl_get_pinconf(const void *blob, int node)
  40 {
  41         const struct pinconf_param *params;
  42         u32 param, arg, conf = 0;
  43         u32 i;
  44
  45         for (i = 0; i < ARRAY_SIZE(conf_params); i++) {
  46                 params = &conf_params[i];
  47                 if (!fdt_get_property(blob, node, params->property, NULL))
  48                         continue;
  49
  50                 param = params->param;
  51                 arg = params->default_value;
  52
  53                 switch (param) {
  54                 case PIN_CONFIG_BIAS_DISABLE:
  55                         conf &= (~ATMEL_PIO_PUEN_MASK);
  56                         conf &= (~ATMEL_PIO_PDEN_MASK);
  57                         break;
  58                 case PIN_CONFIG_BIAS_PULL_UP:
  59                         conf |= ATMEL_PIO_PUEN_MASK;
  60                         break;
  61                 case PIN_CONFIG_BIAS_PULL_DOWN:
  62                         conf |= ATMEL_PIO_PDEN_MASK;
  63                         break;
  64                 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
  65                         if (arg == 0)
  66                                 conf &= (~ATMEL_PIO_OPD_MASK);
  67                         else
  68                                 conf |= ATMEL_PIO_OPD_MASK;
  69                         break;
  70                 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
  71                         if (arg == 0)
  72                                 conf |= ATMEL_PIO_SCHMITT_MASK;
  73                         else
  74                                 conf &= (~ATMEL_PIO_SCHMITT_MASK);
  75                         break;
  76                 case PIN_CONFIG_INPUT_DEBOUNCE:
  77                         if (arg == 0) {
  78                                 conf &= (~ATMEL_PIO_IFEN_MASK);
  79                                 conf &= (~ATMEL_PIO_IFSCEN_MASK);
  80                         } else {
  81                                 conf |= ATMEL_PIO_IFEN_MASK;
  82                                 conf |= ATMEL_PIO_IFSCEN_MASK;
  83                         }
  84                         break;
  85                 default:
  86                         printf("%s: Unsupported configuration parameter: %u\n",
  87                                __func__, param);
  88                         break;
  89                 }
  90         }
  91
  92         return conf;
  93 }
  94
  95 static inline struct atmel_pio4_port *atmel_pio4_bank_base(struct udevice *dev,
  96                                                            u32 bank)
  97 {
  98         struct atmel_pio4_platdata *plat = dev_get_platdata(dev);
  99         struct atmel_pio4_port *bank_base =
 100                         (struct atmel_pio4_port *)((u32)plat->reg_base +
 101                         ATMEL_PIO_BANK_OFFSET * bank);
 102
 103         return bank_base;
 104 }
 105
 106 #define MAX_PINMUX_ENTRIES      40
 107
 108 static int atmel_pinctrl_set_state(struct udevice *dev, struct udevice *config)
 109 {
 110         struct atmel_pio4_port *bank_base;
 111         const void *blob = gd->fdt_blob;
 112         int node = dev_of_offset(config);
 113         u32 offset, func, bank, line;
 114         u32 cells[MAX_PINMUX_ENTRIES];
 115         u32 i, conf;
 116         int count;
 117
 118         conf = atmel_pinctrl_get_pinconf(blob, node);
 119
 120         count = fdtdec_get_int_array_count(blob, node, "pinmux",
 121                                            cells, ARRAY_SIZE(cells));
 122         if (count < 0) {
 123                 printf("%s: bad pinmux array %d\n", __func__, count);
 124                 return -EINVAL;
 125         }
 126
 127         if (count > MAX_PINMUX_ENTRIES) {
 128                 printf("%s: unsupported pinmux array count %d\n",
 129                        __func__, count);
 130                 return -EINVAL;
 131         }
 132
 133         for (i = 0 ; i < count; i++) {
 134                 offset = ATMEL_GET_PIN_NO(cells[i]);
 135                 func = ATMEL_GET_PIN_FUNC(cells[i]);
 136
 137                 bank = ATMEL_PIO_BANK(offset);
 138                 line = ATMEL_PIO_LINE(offset);
 139
 140                 bank_base = atmel_pio4_bank_base(dev, bank);
 141
 142                 writel(BIT(line), &bank_base->mskr);
 143                 conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
 144                 conf |= (func & ATMEL_PIO_CFGR_FUNC_MASK);
 145                 writel(conf, &bank_base->cfgr);
 146         }
 147
 148         return 0;
 149 }
 150
 151 const struct pinctrl_ops atmel_pinctrl_ops  = {
 152         .set_state = atmel_pinctrl_set_state,
 153 };
 154
 155 static int atmel_pinctrl_probe(struct udevice *dev)
 156 {
 157         struct atmel_pio4_platdata *plat = dev_get_platdata(dev);
 158         fdt_addr_t addr_base;
 159
 160         dev = dev_get_parent(dev);
 161         addr_base = devfdt_get_addr(dev);
 162         if (addr_base == FDT_ADDR_T_NONE)
 163                 return -EINVAL;
 164
 165         plat->reg_base = (struct atmel_pio4_port *)addr_base;
 166
 167         return 0;
 168 }
 169
 170 static const struct udevice_id atmel_pinctrl_match[] = {
 171         { .compatible = "atmel,sama5d2-pinctrl" },
 172         {}
 173 };
 174
 175 U_BOOT_DRIVER(atmel_pinctrl) = {
 176         .name = "pinctrl_atmel_pio4",
 177         .id = UCLASS_PINCTRL,
 178         .of_match = atmel_pinctrl_match,
 179         .probe = atmel_pinctrl_probe,
 180         .platdata_auto_alloc_size = sizeof(struct atmel_pio4_platdata),
 181         .ops = &atmel_pinctrl_ops,
 182 };