drivers/pinctrl/pinctrl_pic32.c

   1 /*
   2  * Pinctrl driver for Microchip PIC32 SoCs
   3  * Copyright (c) 2015 Microchip Technology Inc.
   4  * Written by Purna Chandra Mandal <purna.mandal@microchip.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <asm/io.h>
  12 #include <dm/pinctrl.h>
  13 #include <dm/root.h>
  14 #include <mach/pic32.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 /* PIC32 has 10 peripheral ports with 16 pins each.
  19  * Ports are marked PORTA-PORTK or PORT0-PORT9.
  20  */
  21 enum {
  22         PIC32_PORT_A = 0,
  23         PIC32_PORT_B = 1,
  24         PIC32_PORT_C = 2,
  25         PIC32_PORT_D = 3,
  26         PIC32_PORT_E = 4,
  27         PIC32_PORT_F = 5,
  28         PIC32_PORT_G = 6,
  29         PIC32_PORT_H = 7,
  30         PIC32_PORT_J = 8, /* no PORT_I */
  31         PIC32_PORT_K = 9,
  32         PIC32_PINS_PER_PORT = 16,
  33 };
  34
  35 #define PIN_CONFIG_PIC32_DIGITAL        (PIN_CONFIG_END + 1)
  36 #define PIN_CONFIG_PIC32_ANALOG         (PIN_CONFIG_END + 2)
  37
  38 /* pin configuration descriptor */
  39 struct pic32_pin_config {
  40         u16 port;       /* port number */
  41         u16 pin;        /* pin number in the port */
  42         u32 config;     /* one of PIN_CONFIG_* */
  43 };
  44 #define PIN_CONFIG(_prt, _pin, _cfg) \
  45         {.port = (_prt), .pin = (_pin), .config = (_cfg), }
  46
  47 /* In PIC32 muxing is performed at pin-level through two
  48  * different set of registers - one set for input functions,
  49  * and other for output functions.
  50  * Pin configuration is handled through port register.
  51  */
  52 /* Port control registers */
  53 struct pic32_reg_port {
  54         struct pic32_reg_atomic ansel;
  55         struct pic32_reg_atomic tris;
  56         struct pic32_reg_atomic port;
  57         struct pic32_reg_atomic lat;
  58         struct pic32_reg_atomic odc;
  59         struct pic32_reg_atomic cnpu;
  60         struct pic32_reg_atomic cnpd;
  61         struct pic32_reg_atomic cncon;
  62         struct pic32_reg_atomic unused[8];
  63 };
  64
  65 /* Input function mux registers */
  66 struct pic32_reg_in_mux {
  67         u32 unused0;
  68         u32 int1[4];
  69         u32 unused1;
  70         u32 t2ck[8];
  71         u32 ic1[9];
  72         u32 unused2;
  73         u32 ocfar;
  74         u32 unused3;
  75         u32 u1rx;
  76         u32 u1cts;
  77         u32 u2rx;
  78         u32 u2cts;
  79         u32 u3rx;
  80         u32 u3cts;
  81         u32 u4rx;
  82         u32 u4cts;
  83         u32 u5rx;
  84         u32 u5cts;
  85         u32 u6rx;
  86         u32 u6cts;
  87         u32 unused4;
  88         u32 sdi1;
  89         u32 ss1;
  90         u32 unused5;
  91         u32 sdi2;
  92         u32 ss2;
  93         u32 unused6;
  94         u32 sdi3;
  95         u32 ss3;
  96         u32 unused7;
  97         u32 sdi4;
  98         u32 ss4;
  99         u32 unused8;
 100         u32 sdi5;
 101         u32 ss5;
 102         u32 unused9;
 103         u32 sdi6;
 104         u32 ss6;
 105         u32 c1rx;
 106         u32 c2rx;
 107         u32 refclki1;
 108         u32 refclki2;
 109         u32 refclki3;
 110         u32 refclki4;
 111 };
 112
 113 /* output mux register offset */
 114 #define PPS_OUT(__port, __pin) \
 115         (((__port) * PIC32_PINS_PER_PORT + (__pin)) << 2)
 116
 117
 118 struct pic32_pinctrl_priv {
 119         struct pic32_reg_in_mux *mux_in; /* mux input function */
 120         struct pic32_reg_port *pinconf; /* pin configuration*/
 121         void __iomem *mux_out;  /* mux output function */
 122 };
 123
 124 enum {
 125         PERIPH_ID_UART1,
 126         PERIPH_ID_UART2,
 127         PERIPH_ID_ETH,
 128         PERIPH_ID_USB,
 129         PERIPH_ID_SDHCI,
 130         PERIPH_ID_I2C1,
 131         PERIPH_ID_I2C2,
 132         PERIPH_ID_SPI1,
 133         PERIPH_ID_SPI2,
 134         PERIPH_ID_SQI,
 135 };
 136
 137 static int pic32_pinconfig_one(struct pic32_pinctrl_priv *priv,
 138                                u32 port_nr, u32 pin, u32 param)
 139 {
 140         struct pic32_reg_port *port;
 141
 142         port = &priv->pinconf[port_nr];
 143         switch (param) {
 144         case PIN_CONFIG_PIC32_DIGITAL:
 145                 writel(BIT(pin), &port->ansel.clr);
 146                 break;
 147         case PIN_CONFIG_PIC32_ANALOG:
 148                 writel(BIT(pin), &port->ansel.set);
 149                 break;
 150         case PIN_CONFIG_INPUT_ENABLE:
 151                 writel(BIT(pin), &port->tris.set);
 152                 break;
 153         case PIN_CONFIG_OUTPUT:
 154                 writel(BIT(pin), &port->tris.clr);
 155                 break;
 156         case PIN_CONFIG_BIAS_PULL_UP:
 157                 writel(BIT(pin), &port->cnpu.set);
 158                 break;
 159         case PIN_CONFIG_BIAS_PULL_DOWN:
 160                 writel(BIT(pin), &port->cnpd.set);
 161                 break;
 162         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 163                 writel(BIT(pin), &port->odc.set);
 164                 break;
 165         default:
 166                 break;
 167         }
 168
 169         return 0;
 170 }
 171
 172 static int pic32_pinconfig_set(struct pic32_pinctrl_priv *priv,
 173                                const struct pic32_pin_config *list, int count)
 174 {
 175         int i;
 176
 177         for (i = 0 ; i < count; i++)
 178                 pic32_pinconfig_one(priv, list[i].port,
 179                                     list[i].pin, list[i].config);
 180
 181         return 0;
 182 }
 183
 184 static void pic32_eth_pin_config(struct udevice *dev)
 185 {
 186         struct pic32_pinctrl_priv *priv = dev_get_priv(dev);
 187         const struct pic32_pin_config configs[] = {
 188                 /* EMDC - D11 */
 189                 PIN_CONFIG(PIC32_PORT_D, 11, PIN_CONFIG_PIC32_DIGITAL),
 190                 PIN_CONFIG(PIC32_PORT_D, 11, PIN_CONFIG_OUTPUT),
 191                 /* ETXEN */
 192                 PIN_CONFIG(PIC32_PORT_D, 6, PIN_CONFIG_PIC32_DIGITAL),
 193                 PIN_CONFIG(PIC32_PORT_D, 6, PIN_CONFIG_OUTPUT),
 194                 /* ECRSDV */
 195                 PIN_CONFIG(PIC32_PORT_H, 13, PIN_CONFIG_PIC32_DIGITAL),
 196                 PIN_CONFIG(PIC32_PORT_H, 13, PIN_CONFIG_INPUT_ENABLE),
 197                 /* ERXD0 */
 198                 PIN_CONFIG(PIC32_PORT_H, 8, PIN_CONFIG_PIC32_DIGITAL),
 199                 PIN_CONFIG(PIC32_PORT_H, 8, PIN_CONFIG_INPUT_ENABLE),
 200                 PIN_CONFIG(PIC32_PORT_H, 8, PIN_CONFIG_BIAS_PULL_DOWN),
 201                 /* ERXD1 */
 202                 PIN_CONFIG(PIC32_PORT_H, 5, PIN_CONFIG_PIC32_DIGITAL),
 203                 PIN_CONFIG(PIC32_PORT_H, 5, PIN_CONFIG_INPUT_ENABLE),
 204                 PIN_CONFIG(PIC32_PORT_H, 5, PIN_CONFIG_BIAS_PULL_DOWN),
 205                 /* EREFCLK */
 206                 PIN_CONFIG(PIC32_PORT_J, 11, PIN_CONFIG_PIC32_DIGITAL),
 207                 PIN_CONFIG(PIC32_PORT_J, 11, PIN_CONFIG_INPUT_ENABLE),
 208                 /* ETXD1 */
 209                 PIN_CONFIG(PIC32_PORT_J, 9, PIN_CONFIG_PIC32_DIGITAL),
 210                 PIN_CONFIG(PIC32_PORT_J, 9, PIN_CONFIG_OUTPUT),
 211                 /* ETXD0 */
 212                 PIN_CONFIG(PIC32_PORT_J, 8, PIN_CONFIG_PIC32_DIGITAL),
 213                 PIN_CONFIG(PIC32_PORT_J, 8, PIN_CONFIG_OUTPUT),
 214                 /* EMDIO */
 215                 PIN_CONFIG(PIC32_PORT_J, 1, PIN_CONFIG_PIC32_DIGITAL),
 216                 PIN_CONFIG(PIC32_PORT_J, 1, PIN_CONFIG_INPUT_ENABLE),
 217                 /* ERXERR */
 218                 PIN_CONFIG(PIC32_PORT_F, 3, PIN_CONFIG_PIC32_DIGITAL),
 219                 PIN_CONFIG(PIC32_PORT_F, 3, PIN_CONFIG_INPUT_ENABLE),
 220         };
 221
 222         pic32_pinconfig_set(priv, configs, ARRAY_SIZE(configs));
 223 }
 224
 225 static int pic32_pinctrl_request(struct udevice *dev, int func, int flags)
 226 {
 227         struct pic32_pinctrl_priv *priv = dev_get_priv(dev);
 228
 229         switch (func) {
 230         case PERIPH_ID_UART2:
 231                 /* PPS for U2 RX/TX */
 232                 writel(0x02, priv->mux_out + PPS_OUT(PIC32_PORT_G, 9));
 233                 writel(0x05, &priv->mux_in->u2rx); /* B0 */
 234                 /* set digital mode */
 235                 pic32_pinconfig_one(priv, PIC32_PORT_G, 9,
 236                                     PIN_CONFIG_PIC32_DIGITAL);
 237                 pic32_pinconfig_one(priv, PIC32_PORT_B, 0,
 238                                     PIN_CONFIG_PIC32_DIGITAL);
 239                 break;
 240         case PERIPH_ID_ETH:
 241                 pic32_eth_pin_config(dev);
 242                 break;
 243         default:
 244                 debug("%s: unknown-unhandled case\n", __func__);
 245                 break;
 246         }
 247
 248         return 0;
 249 }
 250
 251 static int pic32_pinctrl_get_periph_id(struct udevice *dev,
 252                                        struct udevice *periph)
 253 {
 254         int ret;
 255         u32 cell[2];
 256
 257         ret = fdtdec_get_int_array(gd->fdt_blob, periph->of_offset,
 258                                    "interrupts", cell, ARRAY_SIZE(cell));
 259         if (ret < 0)
 260                 return -EINVAL;
 261
 262         /* interrupt number */
 263         switch (cell[0]) {
 264         case 112 ... 114:
 265                 return PERIPH_ID_UART1;
 266         case 145 ... 147:
 267                 return PERIPH_ID_UART2;
 268         case 109 ... 111:
 269                 return PERIPH_ID_SPI1;
 270         case 142 ... 144:
 271                 return PERIPH_ID_SPI2;
 272         case 115 ... 117:
 273                 return PERIPH_ID_I2C1;
 274         case 148 ... 150:
 275                 return PERIPH_ID_I2C2;
 276         case 132 ... 133:
 277                 return PERIPH_ID_USB;
 278         case 169:
 279                 return PERIPH_ID_SQI;
 280         case 191:
 281                 return PERIPH_ID_SDHCI;
 282         case 153:
 283                 return PERIPH_ID_ETH;
 284         default:
 285                 break;
 286         }
 287
 288         return -ENOENT;
 289 }
 290
 291 static int pic32_pinctrl_set_state_simple(struct udevice *dev,
 292                                           struct udevice *periph)
 293 {
 294         int func;
 295
 296         debug("%s: periph %s\n", __func__, periph->name);
 297         func = pic32_pinctrl_get_periph_id(dev, periph);
 298         if (func < 0)
 299                 return func;
 300         return pic32_pinctrl_request(dev, func, 0);
 301 }
 302
 303 static struct pinctrl_ops pic32_pinctrl_ops = {
 304         .set_state_simple       = pic32_pinctrl_set_state_simple,
 305         .request                = pic32_pinctrl_request,
 306         .get_periph_id          = pic32_pinctrl_get_periph_id,
 307 };
 308
 309 static int pic32_pinctrl_probe(struct udevice *dev)
 310 {
 311         struct pic32_pinctrl_priv *priv = dev_get_priv(dev);
 312         struct fdt_resource res;
 313         void *fdt = (void *)gd->fdt_blob;
 314         int node = dev->of_offset;
 315         int ret;
 316
 317         ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
 318                                      "ppsin", &res);
 319         if (ret < 0) {
 320                 printf("pinctrl: resource \"ppsin\" not found\n");
 321                 return ret;
 322         }
 323         priv->mux_in = ioremap(res.start, fdt_resource_size(&res));
 324
 325         ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
 326                                      "ppsout", &res);
 327         if (ret < 0) {
 328                 printf("pinctrl: resource \"ppsout\" not found\n");
 329                 return ret;
 330         }
 331         priv->mux_out = ioremap(res.start, fdt_resource_size(&res));
 332
 333         ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
 334                                      "port", &res);
 335         if (ret < 0) {
 336                 printf("pinctrl: resource \"port\" not found\n");
 337                 return ret;
 338         }
 339         priv->pinconf = ioremap(res.start, fdt_resource_size(&res));
 340
 341         return 0;
 342 }
 343
 344 static int pic32_pinctrl_bind(struct udevice *dev)
 345 {
 346         /* scan child GPIO banks */
 347         return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
 348 }
 349
 350 static const struct udevice_id pic32_pinctrl_ids[] = {
 351         { .compatible = "microchip,pic32mzda-pinctrl" },
 352         { }
 353 };
 354
 355 U_BOOT_DRIVER(pinctrl_pic32) = {
 356         .name           = "pinctrl_pic32",
 357         .id             = UCLASS_PINCTRL,
 358         .of_match       = pic32_pinctrl_ids,
 359         .ops            = &pic32_pinctrl_ops,
 360         .probe          = pic32_pinctrl_probe,
 361         .bind           = pic32_pinctrl_bind,
 362         .priv_auto_alloc_size = sizeof(struct pic32_pinctrl_priv),
 363 };