linux/drivers/pinctrl/bcm/pinctrl-ns.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2018 Rafał Miłecki <rafal@milecki.pl>
   4 */
   5
   6#include <linux/err.h>
   7#include <linux/io.h>
   8#include <linux/mfd/syscon.h>
   9#include <linux/module.h>
  10#include <linux/of.h>
  11#include <linux/of_device.h>
  12#include <linux/pinctrl/pinconf-generic.h>
  13#include <linux/pinctrl/pinctrl.h>
  14#include <linux/pinctrl/pinmux.h>
  15#include <linux/platform_device.h>
  16#include <linux/regmap.h>
  17#include <linux/slab.h>
  18
  19#define FLAG_BCM4708            BIT(1)
  20#define FLAG_BCM4709            BIT(2)
  21#define FLAG_BCM53012           BIT(3)
  22
  23struct ns_pinctrl {
  24        struct device *dev;
  25        unsigned int chipset_flag;
  26        struct pinctrl_dev *pctldev;
  27        struct regmap *regmap;
  28        u32 offset;
  29
  30        struct pinctrl_desc pctldesc;
  31        struct ns_pinctrl_group *groups;
  32        unsigned int num_groups;
  33        struct ns_pinctrl_function *functions;
  34        unsigned int num_functions;
  35};
  36
  37/*
  38 * Pins
  39 */
  40
  41static const struct pinctrl_pin_desc ns_pinctrl_pins[] = {
  42        { 0, "spi_clk", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  43        { 1, "spi_ss", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  44        { 2, "spi_mosi", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  45        { 3, "spi_miso", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  46        { 4, "i2c_scl", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  47        { 5, "i2c_sda", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  48        { 6, "mdc", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
  49        { 7, "mdio", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
  50        { 8, "pwm0", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  51        { 9, "pwm1", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  52        { 10, "pwm2", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  53        { 11, "pwm3", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  54        { 12, "uart1_rx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  55        { 13, "uart1_tx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  56        { 14, "uart1_cts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  57        { 15, "uart1_rts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
  58        { 16, "uart2_rx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
  59        { 17, "uart2_tx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
  60/* TODO { ??, "xtal_out", (void *)(FLAG_BCM4709) }, */
  61        { 22, "sdio_pwr", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
  62        { 23, "sdio_en_1p8v", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
  63};
  64
  65/*
  66 * Groups
  67 */
  68
  69struct ns_pinctrl_group {
  70        const char *name;
  71        const unsigned int *pins;
  72        const unsigned int num_pins;
  73        unsigned int chipsets;
  74};
  75
  76static const unsigned int spi_pins[] = { 0, 1, 2, 3 };
  77static const unsigned int i2c_pins[] = { 4, 5 };
  78static const unsigned int mdio_pins[] = { 6, 7 };
  79static const unsigned int pwm0_pins[] = { 8 };
  80static const unsigned int pwm1_pins[] = { 9 };
  81static const unsigned int pwm2_pins[] = { 10 };
  82static const unsigned int pwm3_pins[] = { 11 };
  83static const unsigned int uart1_pins[] = { 12, 13, 14, 15 };
  84static const unsigned int uart2_pins[] = { 16, 17 };
  85static const unsigned int sdio_pwr_pins[] = { 22 };
  86static const unsigned int sdio_1p8v_pins[] = { 23 };
  87
  88#define NS_GROUP(_name, _pins, _chipsets)               \
  89{                                                       \
  90        .name = _name,                                  \
  91        .pins = _pins,                                  \
  92        .num_pins = ARRAY_SIZE(_pins),                  \
  93        .chipsets = _chipsets,                          \
  94}
  95
  96static const struct ns_pinctrl_group ns_pinctrl_groups[] = {
  97        NS_GROUP("spi_grp", spi_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
  98        NS_GROUP("i2c_grp", i2c_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
  99        NS_GROUP("mdio_grp", mdio_pins, FLAG_BCM4709 | FLAG_BCM53012),
 100        NS_GROUP("pwm0_grp", pwm0_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 101        NS_GROUP("pwm1_grp", pwm1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 102        NS_GROUP("pwm2_grp", pwm2_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 103        NS_GROUP("pwm3_grp", pwm3_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 104        NS_GROUP("uart1_grp", uart1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 105        NS_GROUP("uart2_grp", uart2_pins, FLAG_BCM4709 | FLAG_BCM53012),
 106        NS_GROUP("sdio_pwr_grp", sdio_pwr_pins, FLAG_BCM4709 | FLAG_BCM53012),
 107        NS_GROUP("sdio_1p8v_grp", sdio_1p8v_pins, FLAG_BCM4709 | FLAG_BCM53012),
 108};
 109
 110/*
 111 * Functions
 112 */
 113
 114struct ns_pinctrl_function {
 115        const char *name;
 116        const char * const *groups;
 117        const unsigned int num_groups;
 118        unsigned int chipsets;
 119};
 120
 121static const char * const spi_groups[] = { "spi_grp" };
 122static const char * const i2c_groups[] = { "i2c_grp" };
 123static const char * const mdio_groups[] = { "mdio_grp" };
 124static const char * const pwm_groups[] = { "pwm0_grp", "pwm1_grp", "pwm2_grp",
 125                                           "pwm3_grp" };
 126static const char * const uart1_groups[] = { "uart1_grp" };
 127static const char * const uart2_groups[] = { "uart2_grp" };
 128static const char * const sdio_groups[] = { "sdio_pwr_grp", "sdio_1p8v_grp" };
 129
 130#define NS_FUNCTION(_name, _groups, _chipsets)          \
 131{                                                       \
 132        .name = _name,                                  \
 133        .groups = _groups,                              \
 134        .num_groups = ARRAY_SIZE(_groups),              \
 135        .chipsets = _chipsets,                          \
 136}
 137
 138static const struct ns_pinctrl_function ns_pinctrl_functions[] = {
 139        NS_FUNCTION("spi", spi_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 140        NS_FUNCTION("i2c", i2c_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 141        NS_FUNCTION("mdio", mdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
 142        NS_FUNCTION("pwm", pwm_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 143        NS_FUNCTION("uart1", uart1_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 144        NS_FUNCTION("uart2", uart2_groups, FLAG_BCM4709 | FLAG_BCM53012),
 145        NS_FUNCTION("sdio", sdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
 146};
 147
 148/*
 149 * Groups code
 150 */
 151
 152static int ns_pinctrl_get_groups_count(struct pinctrl_dev *pctrl_dev)
 153{
 154        struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
 155
 156        return ns_pinctrl->num_groups;
 157}
 158
 159static const char *ns_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
 160                                             unsigned int selector)
 161{
 162        struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
 163
 164        return ns_pinctrl->groups[selector].name;
 165}
 166
 167static int ns_pinctrl_get_group_pins(struct pinctrl_dev *pctrl_dev,
 168                                     unsigned int selector,
 169                                     const unsigned int **pins,
 170                                     unsigned int *num_pins)
 171{
 172        struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
 173
 174        *pins = ns_pinctrl->groups[selector].pins;
 175        *num_pins = ns_pinctrl->groups[selector].num_pins;
 176
 177        return 0;
 178}
 179
 180static const struct pinctrl_ops ns_pinctrl_ops = {
 181        .get_groups_count = ns_pinctrl_get_groups_count,
 182        .get_group_name = ns_pinctrl_get_group_name,
 183        .get_group_pins = ns_pinctrl_get_group_pins,
 184        .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
 185        .dt_free_map = pinconf_generic_dt_free_map,
 186};
 187
 188/*
 189 * Functions code
 190 */
 191
 192static int ns_pinctrl_get_functions_count(struct pinctrl_dev *pctrl_dev)
 193{
 194        struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
 195
 196        return ns_pinctrl->num_functions;
 197}
 198
 199static const char *ns_pinctrl_get_function_name(struct pinctrl_dev *pctrl_dev,
 200                                                unsigned int selector)
 201{
 202        struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
 203
 204        return ns_pinctrl->functions[selector].name;
 205}
 206
 207static int ns_pinctrl_get_function_groups(struct pinctrl_dev *pctrl_dev,
 208                                          unsigned int selector,
 209                                          const char * const **groups,
 210                                          unsigned * const num_groups)
 211{
 212        struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
 213
 214        *groups = ns_pinctrl->functions[selector].groups;
 215        *num_groups = ns_pinctrl->functions[selector].num_groups;
 216
 217        return 0;
 218}
 219
 220static int ns_pinctrl_set_mux(struct pinctrl_dev *pctrl_dev,
 221                              unsigned int func_select,
 222                              unsigned int grp_select)
 223{
 224        struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
 225        u32 unset = 0;
 226        u32 tmp;
 227        int i;
 228
 229        for (i = 0; i < ns_pinctrl->groups[grp_select].num_pins; i++) {
 230                int pin_number = ns_pinctrl->groups[grp_select].pins[i];
 231
 232                unset |= BIT(pin_number);
 233        }
 234
 235        regmap_read(ns_pinctrl->regmap, ns_pinctrl->offset, &tmp);
 236        tmp &= ~unset;
 237        regmap_write(ns_pinctrl->regmap, ns_pinctrl->offset, tmp);
 238
 239        return 0;
 240}
 241
 242static const struct pinmux_ops ns_pinctrl_pmxops = {
 243        .get_functions_count = ns_pinctrl_get_functions_count,
 244        .get_function_name = ns_pinctrl_get_function_name,
 245        .get_function_groups = ns_pinctrl_get_function_groups,
 246        .set_mux = ns_pinctrl_set_mux,
 247};
 248
 249/*
 250 * Controller code
 251 */
 252
 253static struct pinctrl_desc ns_pinctrl_desc = {
 254        .name = "pinctrl-ns",
 255        .pctlops = &ns_pinctrl_ops,
 256        .pmxops = &ns_pinctrl_pmxops,
 257};
 258
 259static const struct of_device_id ns_pinctrl_of_match_table[] = {
 260        { .compatible = "brcm,bcm4708-pinmux", .data = (void *)FLAG_BCM4708, },
 261        { .compatible = "brcm,bcm4709-pinmux", .data = (void *)FLAG_BCM4709, },
 262        { .compatible = "brcm,bcm53012-pinmux", .data = (void *)FLAG_BCM53012, },
 263        { }
 264};
 265
 266static int ns_pinctrl_probe(struct platform_device *pdev)
 267{
 268        struct device *dev = &pdev->dev;
 269        struct device_node *np = dev->of_node;
 270        const struct of_device_id *of_id;
 271        struct ns_pinctrl *ns_pinctrl;
 272        struct pinctrl_desc *pctldesc;
 273        struct pinctrl_pin_desc *pin;
 274        struct ns_pinctrl_group *group;
 275        struct ns_pinctrl_function *function;
 276        int i;
 277
 278        ns_pinctrl = devm_kzalloc(dev, sizeof(*ns_pinctrl), GFP_KERNEL);
 279        if (!ns_pinctrl)
 280                return -ENOMEM;
 281        pctldesc = &ns_pinctrl->pctldesc;
 282        platform_set_drvdata(pdev, ns_pinctrl);
 283
 284        /* Set basic properties */
 285
 286        ns_pinctrl->dev = dev;
 287
 288        of_id = of_match_device(ns_pinctrl_of_match_table, dev);
 289        if (!of_id)
 290                return -EINVAL;
 291        ns_pinctrl->chipset_flag = (uintptr_t)of_id->data;
 292
 293        ns_pinctrl->regmap = syscon_node_to_regmap(of_get_parent(np));
 294        if (IS_ERR(ns_pinctrl->regmap)) {
 295                int err = PTR_ERR(ns_pinctrl->regmap);
 296
 297                dev_err(dev, "Failed to map pinctrl regs: %d\n", err);
 298
 299                return err;
 300        }
 301
 302        if (of_property_read_u32(np, "offset", &ns_pinctrl->offset)) {
 303                dev_err(dev, "Failed to get register offset\n");
 304                return -ENOENT;
 305        }
 306
 307        memcpy(pctldesc, &ns_pinctrl_desc, sizeof(*pctldesc));
 308
 309        /* Set pinctrl properties */
 310
 311        pctldesc->pins = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_pins),
 312                                      sizeof(struct pinctrl_pin_desc),
 313                                      GFP_KERNEL);
 314        if (!pctldesc->pins)
 315                return -ENOMEM;
 316        for (i = 0, pin = (struct pinctrl_pin_desc *)&pctldesc->pins[0];
 317             i < ARRAY_SIZE(ns_pinctrl_pins); i++) {
 318                const struct pinctrl_pin_desc *src = &ns_pinctrl_pins[i];
 319                unsigned int chipsets = (uintptr_t)src->drv_data;
 320
 321                if (chipsets & ns_pinctrl->chipset_flag) {
 322                        memcpy(pin++, src, sizeof(*src));
 323                        pctldesc->npins++;
 324                }
 325        }
 326
 327        ns_pinctrl->groups = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_groups),
 328                                          sizeof(struct ns_pinctrl_group),
 329                                          GFP_KERNEL);
 330        if (!ns_pinctrl->groups)
 331                return -ENOMEM;
 332        for (i = 0, group = &ns_pinctrl->groups[0];
 333             i < ARRAY_SIZE(ns_pinctrl_groups); i++) {
 334                const struct ns_pinctrl_group *src = &ns_pinctrl_groups[i];
 335
 336                if (src->chipsets & ns_pinctrl->chipset_flag) {
 337                        memcpy(group++, src, sizeof(*src));
 338                        ns_pinctrl->num_groups++;
 339                }
 340        }
 341
 342        ns_pinctrl->functions = devm_kcalloc(dev,
 343                                             ARRAY_SIZE(ns_pinctrl_functions),
 344                                             sizeof(struct ns_pinctrl_function),
 345                                             GFP_KERNEL);
 346        if (!ns_pinctrl->functions)
 347                return -ENOMEM;
 348        for (i = 0, function = &ns_pinctrl->functions[0];
 349             i < ARRAY_SIZE(ns_pinctrl_functions); i++) {
 350                const struct ns_pinctrl_function *src = &ns_pinctrl_functions[i];
 351
 352                if (src->chipsets & ns_pinctrl->chipset_flag) {
 353                        memcpy(function++, src, sizeof(*src));
 354                        ns_pinctrl->num_functions++;
 355                }
 356        }
 357
 358        /* Register */
 359
 360        ns_pinctrl->pctldev = devm_pinctrl_register(dev, pctldesc, ns_pinctrl);
 361        if (IS_ERR(ns_pinctrl->pctldev)) {
 362                dev_err(dev, "Failed to register pinctrl\n");
 363                return PTR_ERR(ns_pinctrl->pctldev);
 364        }
 365
 366        return 0;
 367}
 368
 369static struct platform_driver ns_pinctrl_driver = {
 370        .probe = ns_pinctrl_probe,
 371        .driver = {
 372                .name = "ns-pinmux",
 373                .of_match_table = ns_pinctrl_of_match_table,
 374        },
 375};
 376
 377module_platform_driver(ns_pinctrl_driver);
 378
 379MODULE_AUTHOR("Rafał Miłecki");
 380MODULE_LICENSE("GPL v2");
 381MODULE_DEVICE_TABLE(of, ns_pinctrl_of_match_table);
 382