drivers/pinctrl/renesas/pfc-r7s72100.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * R7S72100 processor support
   4  *
   5  * Copyright (C) 2019 Marek Vasut <marek.vasut@gmail.com>
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <dm/lists.h>
  11 #include <dm/pinctrl.h>
  12 #include <linux/bitops.h>
  13 #include <linux/io.h>
  14 #include <linux/err.h>
  15
  16 #define P(bank)                 (0x0000 + (bank) * 4)
  17 #define PSR(bank)               (0x0100 + (bank) * 4)
  18 #define PPR(bank)               (0x0200 + (bank) * 4)
  19 #define PM(bank)                (0x0300 + (bank) * 4)
  20 #define PMC(bank)               (0x0400 + (bank) * 4)
  21 #define PFC(bank)               (0x0500 + (bank) * 4)
  22 #define PFCE(bank)              (0x0600 + (bank) * 4)
  23 #define PNOT(bank)              (0x0700 + (bank) * 4)
  24 #define PMSR(bank)              (0x0800 + (bank) * 4)
  25 #define PMCSR(bank)             (0x0900 + (bank) * 4)
  26 #define PFCAE(bank)             (0x0A00 + (bank) * 4)
  27 #define PIBC(bank)              (0x4000 + (bank) * 4)
  28 #define PBDC(bank)              (0x4100 + (bank) * 4)
  29 #define PIPC(bank)              (0x4200 + (bank) * 4)
  30
  31 #define RZA1_PINS_PER_PORT      16
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 struct r7s72100_pfc_plat {
  36         void __iomem    *base;
  37 };
  38
  39 static void r7s72100_pfc_set_function(struct udevice *dev, u16 bank, u16 line,
  40                                       u16 func, u16 inbuf, u16 bidir)
  41 {
  42         struct r7s72100_pfc_plat *plat = dev_get_plat(dev);
  43
  44         clrsetbits_le16(plat->base + PFCAE(bank), BIT(line),
  45                         (func & BIT(2)) ? BIT(line) : 0);
  46         clrsetbits_le16(plat->base + PFCE(bank), BIT(line),
  47                         (func & BIT(1)) ? BIT(line) : 0);
  48         clrsetbits_le16(plat->base + PFC(bank), BIT(line),
  49                         (func & BIT(0)) ? BIT(line) : 0);
  50
  51         clrsetbits_le16(plat->base + PIBC(bank), BIT(line),
  52                         inbuf ? BIT(line) : 0);
  53         clrsetbits_le16(plat->base + PBDC(bank), BIT(line),
  54                         bidir ? BIT(line) : 0);
  55
  56         setbits_le32(plat->base + PMCSR(bank), BIT(line + 16) | BIT(line));
  57
  58         setbits_le16(plat->base + PIPC(bank), BIT(line));
  59 }
  60
  61 static int r7s72100_pfc_set_state(struct udevice *dev, struct udevice *config)
  62 {
  63         const void *blob = gd->fdt_blob;
  64         int node = dev_of_offset(config);
  65         u32 cells[32];
  66         u16 bank, line, func;
  67         int i, count, bidir;
  68
  69         count = fdtdec_get_int_array_count(blob, node, "pinmux",
  70                                            cells, ARRAY_SIZE(cells));
  71         if (count < 0) {
  72                 printf("%s: bad pinmux array %d\n", __func__, count);
  73                 return -EINVAL;
  74         }
  75
  76         if (count > ARRAY_SIZE(cells)) {
  77                 printf("%s: unsupported pinmux array count %d\n",
  78                        __func__, count);
  79                 return -EINVAL;
  80         }
  81
  82         for (i = 0 ; i < count; i++) {
  83                 func = (cells[i] >> 16) & 0xf;
  84                 if (func == 0 || func > 8) {
  85                         printf("Invalid cell %i in node %s!\n",
  86                                count, ofnode_get_name(dev_ofnode(config)));
  87                         continue;
  88                 }
  89
  90                 func = (func - 1) & 0x7;
  91
  92                 bank = (cells[i] / RZA1_PINS_PER_PORT) & 0xff;
  93                 line = cells[i] % RZA1_PINS_PER_PORT;
  94
  95                 bidir = 0;
  96                 if (bank == 3 && line == 3 && func == 1)
  97                         bidir = 1;
  98
  99                 r7s72100_pfc_set_function(dev, bank, line, func, 0, bidir);
 100         }
 101
 102         return 0;
 103 }
 104
 105 const struct pinctrl_ops r7s72100_pfc_ops  = {
 106         .set_state = r7s72100_pfc_set_state,
 107 };
 108
 109 static int r7s72100_pfc_probe(struct udevice *dev)
 110 {
 111         struct r7s72100_pfc_plat *plat = dev_get_plat(dev);
 112         fdt_addr_t addr_base;
 113         ofnode node;
 114
 115         addr_base = dev_read_addr(dev);
 116         if (addr_base == FDT_ADDR_T_NONE)
 117                 return -EINVAL;
 118
 119         plat->base = (void __iomem *)addr_base;
 120
 121         dev_for_each_subnode(node, dev) {
 122                 struct udevice *cdev;
 123
 124                 if (!ofnode_read_bool(node, "gpio-controller"))
 125                         continue;
 126
 127                 device_bind_driver_to_node(dev, "r7s72100-gpio",
 128                                            ofnode_get_name(node),
 129                                            node, &cdev);
 130         }
 131
 132         return 0;
 133 }
 134
 135 static const struct udevice_id r7s72100_pfc_match[] = {
 136         { .compatible = "renesas,r7s72100-ports" },
 137         {}
 138 };
 139
 140 U_BOOT_DRIVER(r7s72100_pfc) = {
 141         .name           = "r7s72100_pfc",
 142         .id             = UCLASS_PINCTRL,
 143         .of_match       = r7s72100_pfc_match,
 144         .probe          = r7s72100_pfc_probe,
 145         .plat_auto      = sizeof(struct r7s72100_pfc_plat),
 146         .ops            = &r7s72100_pfc_ops,
 147 };