drivers/pinctrl/pinctrl-falcon.c

   1 /*
   2  *  linux/drivers/pinctrl/pinmux-falcon.c
   3  *  based on linux/drivers/pinctrl/pinmux-pxa910.c
   4  *
   5  *  This program is free software; you can redistribute it and/or modify it
   6  *  under the terms of the GNU General Public License version 2 as published
   7  *  by the Free Software Foundation.
   8  *
   9  *  Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
  10  *  Copyright (C) 2012 John Crispin <blogic@openwrt.org>
  11  */
  12
  13 #include <linux/gpio.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/slab.h>
  16 #include <linux/export.h>
  17 #include <linux/err.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/of_platform.h>
  21 #include <linux/of_address.h>
  22 #include <linux/of_gpio.h>
  23 #include <linux/platform_device.h>
  24
  25 #include "pinctrl-lantiq.h"
  26
  27 #include <lantiq_soc.h>
  28
  29 /* Multiplexer Control Register */
  30 #define LTQ_PADC_MUX(x)         (x * 0x4)
  31 /* Pull Up Enable Register */
  32 #define LTQ_PADC_PUEN           0x80
  33 /* Pull Down Enable Register */
  34 #define LTQ_PADC_PDEN           0x84
  35 /* Slew Rate Control Register */
  36 #define LTQ_PADC_SRC            0x88
  37 /* Drive Current Control Register */
  38 #define LTQ_PADC_DCC            0x8C
  39 /* Pad Control Availability Register */
  40 #define LTQ_PADC_AVAIL          0xF0
  41
  42 #define pad_r32(p, reg)         ltq_r32(p + reg)
  43 #define pad_w32(p, val, reg)    ltq_w32(val, p + reg)
  44 #define pad_w32_mask(c, clear, set, reg) \
  45                 pad_w32(c, (pad_r32(c, reg) & ~(clear)) | (set), reg)
  46
  47 #define pad_getbit(m, r, p)     (!!(ltq_r32(m + r) & (1 << p)))
  48
  49 #define PORTS                   5
  50 #define PINS                    32
  51 #define PORT(x)                 (x / PINS)
  52 #define PORT_PIN(x)             (x % PINS)
  53
  54 #define MFP_FALCON(a, f0, f1, f2, f3)           \
  55 {                                               \
  56         .name = #a,                             \
  57         .pin = a,                               \
  58         .func = {                               \
  59                 FALCON_MUX_##f0,                \
  60                 FALCON_MUX_##f1,                \
  61                 FALCON_MUX_##f2,                \
  62                 FALCON_MUX_##f3,                \
  63         },                                      \
  64 }
  65
  66 #define GRP_MUX(a, m, p)        \
  67 {                               \
  68         .name = a,              \
  69         .mux = FALCON_MUX_##m,  \
  70         .pins = p,              \
  71         .npins = ARRAY_SIZE(p), \
  72 }
  73
  74 enum falcon_mux {
  75         FALCON_MUX_GPIO = 0,
  76         FALCON_MUX_RST,
  77         FALCON_MUX_NTR,
  78         FALCON_MUX_MDIO,
  79         FALCON_MUX_LED,
  80         FALCON_MUX_SPI,
  81         FALCON_MUX_ASC,
  82         FALCON_MUX_I2C,
  83         FALCON_MUX_HOSTIF,
  84         FALCON_MUX_SLIC,
  85         FALCON_MUX_JTAG,
  86         FALCON_MUX_PCM,
  87         FALCON_MUX_MII,
  88         FALCON_MUX_PHY,
  89         FALCON_MUX_NONE = 0xffff,
  90 };
  91
  92 static struct pinctrl_pin_desc falcon_pads[PORTS * PINS];
  93 static int pad_count[PORTS];
  94
  95 static void lantiq_load_pin_desc(struct pinctrl_pin_desc *d, int bank, int len)
  96 {
  97         int base = bank * PINS;
  98         int i;
  99
 100         for (i = 0; i < len; i++) {
 101                 /* strlen("ioXYZ") + 1 = 6 */
 102                 char *name = kzalloc(6, GFP_KERNEL);
 103                 snprintf(name, 6, "io%d", base + i);
 104                 d[i].number = base + i;
 105                 d[i].name = name;
 106         }
 107         pad_count[bank] = len;
 108 }
 109
 110 static struct ltq_mfp_pin falcon_mfp[] = {
 111         /*      pin             f0      f1      f2      f3 */
 112         MFP_FALCON(GPIO0,       RST,    GPIO,   NONE,   NONE),
 113         MFP_FALCON(GPIO1,       GPIO,   GPIO,   NONE,   NONE),
 114         MFP_FALCON(GPIO2,       GPIO,   GPIO,   NONE,   NONE),
 115         MFP_FALCON(GPIO3,       GPIO,   GPIO,   NONE,   NONE),
 116         MFP_FALCON(GPIO4,       NTR,    GPIO,   NONE,   NONE),
 117         MFP_FALCON(GPIO5,       NTR,    GPIO,   NONE,   NONE),
 118         MFP_FALCON(GPIO6,       RST,    GPIO,   NONE,   NONE),
 119         MFP_FALCON(GPIO7,       MDIO,   GPIO,   NONE,   NONE),
 120         MFP_FALCON(GPIO8,       MDIO,   GPIO,   NONE,   NONE),
 121         MFP_FALCON(GPIO9,       LED,    GPIO,   NONE,   NONE),
 122         MFP_FALCON(GPIO10,      LED,    GPIO,   NONE,   NONE),
 123         MFP_FALCON(GPIO11,      LED,    GPIO,   NONE,   NONE),
 124         MFP_FALCON(GPIO12,      LED,    GPIO,   NONE,   NONE),
 125         MFP_FALCON(GPIO13,      LED,    GPIO,   NONE,   NONE),
 126         MFP_FALCON(GPIO14,      LED,    GPIO,   NONE,   NONE),
 127         MFP_FALCON(GPIO32,      ASC,    GPIO,   NONE,   NONE),
 128         MFP_FALCON(GPIO33,      ASC,    GPIO,   NONE,   NONE),
 129         MFP_FALCON(GPIO34,      SPI,    GPIO,   NONE,   NONE),
 130         MFP_FALCON(GPIO35,      SPI,    GPIO,   NONE,   NONE),
 131         MFP_FALCON(GPIO36,      SPI,    GPIO,   NONE,   NONE),
 132         MFP_FALCON(GPIO37,      SPI,    GPIO,   NONE,   NONE),
 133         MFP_FALCON(GPIO38,      SPI,    GPIO,   NONE,   NONE),
 134         MFP_FALCON(GPIO39,      I2C,    GPIO,   NONE,   NONE),
 135         MFP_FALCON(GPIO40,      I2C,    GPIO,   NONE,   NONE),
 136         MFP_FALCON(GPIO41,      HOSTIF, GPIO,   HOSTIF, JTAG),
 137         MFP_FALCON(GPIO42,      HOSTIF, GPIO,   HOSTIF, NONE),
 138         MFP_FALCON(GPIO43,      SLIC,   GPIO,   NONE,   NONE),
 139         MFP_FALCON(GPIO44,      SLIC,   GPIO,   PCM,    ASC),
 140         MFP_FALCON(GPIO45,      SLIC,   GPIO,   PCM,    ASC),
 141         MFP_FALCON(GPIO64,      MII,    GPIO,   NONE,   NONE),
 142         MFP_FALCON(GPIO65,      MII,    GPIO,   NONE,   NONE),
 143         MFP_FALCON(GPIO66,      MII,    GPIO,   NONE,   NONE),
 144         MFP_FALCON(GPIO67,      MII,    GPIO,   NONE,   NONE),
 145         MFP_FALCON(GPIO68,      MII,    GPIO,   NONE,   NONE),
 146         MFP_FALCON(GPIO69,      MII,    GPIO,   NONE,   NONE),
 147         MFP_FALCON(GPIO70,      MII,    GPIO,   NONE,   NONE),
 148         MFP_FALCON(GPIO71,      MII,    GPIO,   NONE,   NONE),
 149         MFP_FALCON(GPIO72,      MII,    GPIO,   NONE,   NONE),
 150         MFP_FALCON(GPIO73,      MII,    GPIO,   NONE,   NONE),
 151         MFP_FALCON(GPIO74,      MII,    GPIO,   NONE,   NONE),
 152         MFP_FALCON(GPIO75,      MII,    GPIO,   NONE,   NONE),
 153         MFP_FALCON(GPIO76,      MII,    GPIO,   NONE,   NONE),
 154         MFP_FALCON(GPIO77,      MII,    GPIO,   NONE,   NONE),
 155         MFP_FALCON(GPIO78,      MII,    GPIO,   NONE,   NONE),
 156         MFP_FALCON(GPIO79,      MII,    GPIO,   NONE,   NONE),
 157         MFP_FALCON(GPIO80,      MII,    GPIO,   NONE,   NONE),
 158         MFP_FALCON(GPIO81,      MII,    GPIO,   NONE,   NONE),
 159         MFP_FALCON(GPIO82,      MII,    GPIO,   NONE,   NONE),
 160         MFP_FALCON(GPIO83,      MII,    GPIO,   NONE,   NONE),
 161         MFP_FALCON(GPIO84,      MII,    GPIO,   NONE,   NONE),
 162         MFP_FALCON(GPIO85,      MII,    GPIO,   NONE,   NONE),
 163         MFP_FALCON(GPIO86,      MII,    GPIO,   NONE,   NONE),
 164         MFP_FALCON(GPIO87,      MII,    GPIO,   NONE,   NONE),
 165         MFP_FALCON(GPIO88,      PHY,    GPIO,   NONE,   NONE),
 166 };
 167
 168 static const unsigned pins_por[] = {GPIO0};
 169 static const unsigned pins_ntr[] = {GPIO4};
 170 static const unsigned pins_ntr8k[] = {GPIO5};
 171 static const unsigned pins_hrst[] = {GPIO6};
 172 static const unsigned pins_mdio[] = {GPIO7, GPIO8};
 173 static const unsigned pins_bled[] = {GPIO7, GPIO10, GPIO11,
 174                                         GPIO12, GPIO13, GPIO14};
 175 static const unsigned pins_asc0[] = {GPIO32, GPIO33};
 176 static const unsigned pins_spi[] = {GPIO34, GPIO35, GPIO36};
 177 static const unsigned pins_spi_cs0[] = {GPIO37};
 178 static const unsigned pins_spi_cs1[] = {GPIO38};
 179 static const unsigned pins_i2c[] = {GPIO39, GPIO40};
 180 static const unsigned pins_jtag[] = {GPIO41};
 181 static const unsigned pins_slic[] = {GPIO43, GPIO44, GPIO45};
 182 static const unsigned pins_pcm[] = {GPIO44, GPIO45};
 183 static const unsigned pins_asc1[] = {GPIO44, GPIO45};
 184
 185 static struct ltq_pin_group falcon_grps[] = {
 186         GRP_MUX("por", RST, pins_por),
 187         GRP_MUX("ntr", NTR, pins_ntr),
 188         GRP_MUX("ntr8k", NTR, pins_ntr8k),
 189         GRP_MUX("hrst", RST, pins_hrst),
 190         GRP_MUX("mdio", MDIO, pins_mdio),
 191         GRP_MUX("bootled", LED, pins_bled),
 192         GRP_MUX("asc0", ASC, pins_asc0),
 193         GRP_MUX("spi", SPI, pins_spi),
 194         GRP_MUX("spi cs0", SPI, pins_spi_cs0),
 195         GRP_MUX("spi cs1", SPI, pins_spi_cs1),
 196         GRP_MUX("i2c", I2C, pins_i2c),
 197         GRP_MUX("jtag", JTAG, pins_jtag),
 198         GRP_MUX("slic", SLIC, pins_slic),
 199         GRP_MUX("pcm", PCM, pins_pcm),
 200         GRP_MUX("asc1", ASC, pins_asc1),
 201 };
 202
 203 static const char * const ltq_rst_grps[] = {"por", "hrst"};
 204 static const char * const ltq_ntr_grps[] = {"ntr", "ntr8k"};
 205 static const char * const ltq_mdio_grps[] = {"mdio"};
 206 static const char * const ltq_bled_grps[] = {"bootled"};
 207 static const char * const ltq_asc_grps[] = {"asc0", "asc1"};
 208 static const char * const ltq_spi_grps[] = {"spi", "spi cs0", "spi cs1"};
 209 static const char * const ltq_i2c_grps[] = {"i2c"};
 210 static const char * const ltq_jtag_grps[] = {"jtag"};
 211 static const char * const ltq_slic_grps[] = {"slic"};
 212 static const char * const ltq_pcm_grps[] = {"pcm"};
 213
 214 static struct ltq_pmx_func falcon_funcs[] = {
 215         {"rst",         ARRAY_AND_SIZE(ltq_rst_grps)},
 216         {"ntr",         ARRAY_AND_SIZE(ltq_ntr_grps)},
 217         {"mdio",        ARRAY_AND_SIZE(ltq_mdio_grps)},
 218         {"led",         ARRAY_AND_SIZE(ltq_bled_grps)},
 219         {"asc",         ARRAY_AND_SIZE(ltq_asc_grps)},
 220         {"spi",         ARRAY_AND_SIZE(ltq_spi_grps)},
 221         {"i2c",         ARRAY_AND_SIZE(ltq_i2c_grps)},
 222         {"jtag",        ARRAY_AND_SIZE(ltq_jtag_grps)},
 223         {"slic",        ARRAY_AND_SIZE(ltq_slic_grps)},
 224         {"pcm",         ARRAY_AND_SIZE(ltq_pcm_grps)},
 225 };
 226
 227
 228
 229
 230 /* ---------  pinconf related code --------- */
 231 static int falcon_pinconf_group_get(struct pinctrl_dev *pctrldev,
 232                                 unsigned group, unsigned long *config)
 233 {
 234         return -ENOTSUPP;
 235 }
 236
 237 static int falcon_pinconf_group_set(struct pinctrl_dev *pctrldev,
 238                                 unsigned group, unsigned long config)
 239 {
 240         return -ENOTSUPP;
 241 }
 242
 243 static int falcon_pinconf_get(struct pinctrl_dev *pctrldev,
 244                                 unsigned pin, unsigned long *config)
 245 {
 246         struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
 247         enum ltq_pinconf_param param = LTQ_PINCONF_UNPACK_PARAM(*config);
 248         void __iomem *mem = info->membase[PORT(pin)];
 249
 250         switch (param) {
 251         case LTQ_PINCONF_PARAM_DRIVE_CURRENT:
 252                 *config = LTQ_PINCONF_PACK(param,
 253                         !!pad_getbit(mem, LTQ_PADC_DCC, PORT_PIN(pin)));
 254                 break;
 255
 256         case LTQ_PINCONF_PARAM_SLEW_RATE:
 257                 *config = LTQ_PINCONF_PACK(param,
 258                         !!pad_getbit(mem, LTQ_PADC_SRC, PORT_PIN(pin)));
 259                 break;
 260
 261         case LTQ_PINCONF_PARAM_PULL:
 262                 if (pad_getbit(mem, LTQ_PADC_PDEN, PORT_PIN(pin)))
 263                         *config = LTQ_PINCONF_PACK(param, 1);
 264                 else if (pad_getbit(mem, LTQ_PADC_PUEN, PORT_PIN(pin)))
 265                         *config = LTQ_PINCONF_PACK(param, 2);
 266                 else
 267                         *config = LTQ_PINCONF_PACK(param, 0);
 268
 269                 break;
 270
 271         default:
 272                 return -ENOTSUPP;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static int falcon_pinconf_set(struct pinctrl_dev *pctrldev,
 279                         unsigned pin, unsigned long config)
 280 {
 281         enum ltq_pinconf_param param = LTQ_PINCONF_UNPACK_PARAM(config);
 282         int arg = LTQ_PINCONF_UNPACK_ARG(config);
 283         struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
 284         void __iomem *mem = info->membase[PORT(pin)];
 285         u32 reg;
 286
 287         switch (param) {
 288         case LTQ_PINCONF_PARAM_DRIVE_CURRENT:
 289                 reg = LTQ_PADC_DCC;
 290                 break;
 291
 292         case LTQ_PINCONF_PARAM_SLEW_RATE:
 293                 reg = LTQ_PADC_SRC;
 294                 break;
 295
 296         case LTQ_PINCONF_PARAM_PULL:
 297                 if (arg == 1)
 298                         reg = LTQ_PADC_PDEN;
 299                 else
 300                         reg = LTQ_PADC_PUEN;
 301                 break;
 302
 303         default:
 304                 pr_err("%s: Invalid config param %04x\n",
 305                 pinctrl_dev_get_name(pctrldev), param);
 306                 return -ENOTSUPP;
 307         }
 308
 309         pad_w32(mem, BIT(PORT_PIN(pin)), reg);
 310         if (!(pad_r32(mem, reg) & BIT(PORT_PIN(pin))))
 311                 return -ENOTSUPP;
 312         return 0;
 313 }
 314
 315 static void falcon_pinconf_dbg_show(struct pinctrl_dev *pctrldev,
 316                         struct seq_file *s, unsigned offset)
 317 {
 318 }
 319
 320 static void falcon_pinconf_group_dbg_show(struct pinctrl_dev *pctrldev,
 321                         struct seq_file *s, unsigned selector)
 322 {
 323 }
 324
 325 static struct pinconf_ops falcon_pinconf_ops = {
 326         .pin_config_get                 = falcon_pinconf_get,
 327         .pin_config_set                 = falcon_pinconf_set,
 328         .pin_config_group_get           = falcon_pinconf_group_get,
 329         .pin_config_group_set           = falcon_pinconf_group_set,
 330         .pin_config_dbg_show            = falcon_pinconf_dbg_show,
 331         .pin_config_group_dbg_show      = falcon_pinconf_group_dbg_show,
 332 };
 333
 334 static struct pinctrl_desc falcon_pctrl_desc = {
 335         .owner          = THIS_MODULE,
 336         .pins           = falcon_pads,
 337         .confops        = &falcon_pinconf_ops,
 338 };
 339
 340 static inline int falcon_mux_apply(struct pinctrl_dev *pctrldev,
 341                         int mfp, int mux)
 342 {
 343         struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
 344         int port = PORT(info->mfp[mfp].pin);
 345
 346         if ((port >= PORTS) || (!info->membase[port]))
 347                 return -ENODEV;
 348
 349         pad_w32(info->membase[port], mux,
 350                 LTQ_PADC_MUX(PORT_PIN(info->mfp[mfp].pin)));
 351         return 0;
 352 }
 353
 354 static const struct ltq_cfg_param falcon_cfg_params[] = {
 355         {"lantiq,pull",                 LTQ_PINCONF_PARAM_PULL},
 356         {"lantiq,drive-current",        LTQ_PINCONF_PARAM_DRIVE_CURRENT},
 357         {"lantiq,slew-rate",            LTQ_PINCONF_PARAM_SLEW_RATE},
 358 };
 359
 360 static struct ltq_pinmux_info falcon_info = {
 361         .desc           = &falcon_pctrl_desc,
 362         .apply_mux      = falcon_mux_apply,
 363 };
 364
 365
 366
 367
 368 /* --------- register the pinctrl layer --------- */
 369
 370 int pinctrl_falcon_get_range_size(int id)
 371 {
 372         u32 avail;
 373
 374         if ((id >= PORTS) || (!falcon_info.membase[id]))
 375                 return -EINVAL;
 376
 377         avail = pad_r32(falcon_info.membase[id], LTQ_PADC_AVAIL);
 378
 379         return fls(avail);
 380 }
 381
 382 void pinctrl_falcon_add_gpio_range(struct pinctrl_gpio_range *range)
 383 {
 384         pinctrl_add_gpio_range(falcon_info.pctrl, range);
 385 }
 386
 387 static int pinctrl_falcon_probe(struct platform_device *pdev)
 388 {
 389         struct device_node *np;
 390         int pad_count = 0;
 391         int ret = 0;
 392
 393         /* load and remap the pad resources of the different banks */
 394         for_each_compatible_node(np, NULL, "lantiq,pad-falcon") {
 395                 struct platform_device *ppdev = of_find_device_by_node(np);
 396                 const __be32 *bank = of_get_property(np, "lantiq,bank", NULL);
 397                 struct resource res;
 398                 u32 avail;
 399                 int pins;
 400
 401                 if (!ppdev) {
 402                         dev_err(&pdev->dev, "failed to find pad pdev\n");
 403                         continue;
 404                 }
 405                 if (!bank || *bank >= PORTS)
 406                         continue;
 407                 if (of_address_to_resource(np, 0, &res))
 408                         continue;
 409                 falcon_info.clk[*bank] = clk_get(&ppdev->dev, NULL);
 410                 if (IS_ERR(falcon_info.clk[*bank])) {
 411                         dev_err(&ppdev->dev, "failed to get clock\n");
 412                         return PTR_ERR(falcon_info.clk[*bank]);
 413                 }
 414                 falcon_info.membase[*bank] =
 415                                 devm_request_and_ioremap(&pdev->dev, &res);
 416                 if (!falcon_info.membase[*bank]) {
 417                         dev_err(&pdev->dev,
 418                                 "Failed to remap memory for bank %d\n",
 419                                 *bank);
 420                         return -ENOMEM;
 421                 }
 422                 avail = pad_r32(falcon_info.membase[*bank],
 423                                         LTQ_PADC_AVAIL);
 424                 pins = fls(avail);
 425                 lantiq_load_pin_desc(&falcon_pads[pad_count], *bank, pins);
 426                 pad_count += pins;
 427                 clk_enable(falcon_info.clk[*bank]);
 428                 dev_dbg(&pdev->dev, "found %s with %d pads\n",
 429                                 res.name, pins);
 430         }
 431         dev_dbg(&pdev->dev, "found a total of %d pads\n", pad_count);
 432         falcon_pctrl_desc.name  = dev_name(&pdev->dev);
 433         falcon_pctrl_desc.npins = pad_count;
 434
 435         falcon_info.mfp         = falcon_mfp;
 436         falcon_info.num_mfp     = ARRAY_SIZE(falcon_mfp);
 437         falcon_info.grps        = falcon_grps;
 438         falcon_info.num_grps    = ARRAY_SIZE(falcon_grps);
 439         falcon_info.funcs       = falcon_funcs;
 440         falcon_info.num_funcs   = ARRAY_SIZE(falcon_funcs);
 441
 442         ret = ltq_pinctrl_register(pdev, &falcon_info);
 443         if (!ret)
 444                 dev_info(&pdev->dev, "Init done\n");
 445         return ret;
 446 }
 447
 448 static const struct of_device_id falcon_match[] = {
 449         { .compatible = "lantiq,pinctrl-falcon" },
 450         {},
 451 };
 452 MODULE_DEVICE_TABLE(of, falcon_match);
 453
 454 static struct platform_driver pinctrl_falcon_driver = {
 455         .probe = pinctrl_falcon_probe,
 456         .driver = {
 457                 .name = "pinctrl-falcon",
 458                 .owner = THIS_MODULE,
 459                 .of_match_table = falcon_match,
 460         },
 461 };
 462
 463 int __init pinctrl_falcon_init(void)
 464 {
 465         return platform_driver_register(&pinctrl_falcon_driver);
 466 }
 467
 468 core_initcall_sync(pinctrl_falcon_init);