Quelle  pinctrl-ns.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018 Rafał Miłecki <rafal@milecki.pl>
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/slab.h>

#include "../core.h"
#include "../pinmux.h"

#define FLAG_BCM4708  BIT(1)
#define FLAG_BCM4709  BIT(2)
#define FLAG_BCM53012  BIT(3)

struct ns_pinctrl {
 struct device *dev;
 unsigned int chipset_flag;
 struct pinctrl_dev *pctldev;
 void __iomem *base;

 struct pinctrl_desc pctldesc;
};

/*
 * Pins
 */

static const struct pinctrl_pin_desc ns_pinctrl_pins[] = {
 { 0, "spi_clk", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 1, "spi_ss", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 2, "spi_mosi", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 3, "spi_miso", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 4, "i2c_scl", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 5, "i2c_sda", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 6, "mdc", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
 { 7, "mdio", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
 { 8, "pwm0", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 9, "pwm1", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 10, "pwm2", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 11, "pwm3", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 12, "uart1_rx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 13, "uart1_tx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 14, "uart1_cts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 15, "uart1_rts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
 { 16, "uart2_rx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
 { 17, "uart2_tx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
/* TODO { ??, "xtal_out", (void *)(FLAG_BCM4709) }, */
 { 22, "sdio_pwr", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
 { 23, "sdio_en_1p8v", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
};

/*
 * Groups
 */

struct ns_pinctrl_group {
 const char *name;
 unsigned int *pins;
 const unsigned int num_pins;
 unsigned int chipsets;
};

static unsigned int spi_pins[] = { 0, 1, 2, 3 };
static unsigned int i2c_pins[] = { 4, 5 };
static unsigned int mdio_pins[] = { 6, 7 };
static unsigned int pwm0_pins[] = { 8 };
static unsigned int pwm1_pins[] = { 9 };
static unsigned int pwm2_pins[] = { 10 };
static unsigned int pwm3_pins[] = { 11 };
static unsigned int uart1_pins[] = { 12, 13, 14, 15 };
static unsigned int uart2_pins[] = { 16, 17 };
static unsigned int sdio_pwr_pins[] = { 22 };
static unsigned int sdio_1p8v_pins[] = { 23 };

#define NS_GROUP(_name, _pins, _chipsets)  \
{       \
 .name = _name,     \
 .pins = _pins,     \
 .num_pins = ARRAY_SIZE(_pins),   \
 .chipsets = _chipsets,    \
}

static const struct ns_pinctrl_group ns_pinctrl_groups[] = {
 NS_GROUP("spi_grp", spi_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_GROUP("i2c_grp", i2c_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_GROUP("mdio_grp", mdio_pins, FLAG_BCM4709 | FLAG_BCM53012),
 NS_GROUP("pwm0_grp", pwm0_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_GROUP("pwm1_grp", pwm1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_GROUP("pwm2_grp", pwm2_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_GROUP("pwm3_grp", pwm3_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_GROUP("uart1_grp", uart1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_GROUP("uart2_grp", uart2_pins, FLAG_BCM4709 | FLAG_BCM53012),
 NS_GROUP("sdio_pwr_grp", sdio_pwr_pins, FLAG_BCM4709 | FLAG_BCM53012),
 NS_GROUP("sdio_1p8v_grp", sdio_1p8v_pins, FLAG_BCM4709 | FLAG_BCM53012),
};

/*
 * Functions
 */

struct ns_pinctrl_function {
 const char *name;
 const char * const *groups;
 const unsigned int num_groups;
 unsigned int chipsets;
};

static const char * const spi_groups[] = { "spi_grp" };
static const char * const i2c_groups[] = { "i2c_grp" };
static const char * const mdio_groups[] = { "mdio_grp" };
static const char * const pwm_groups[] = { "pwm0_grp", "pwm1_grp", "pwm2_grp",
        "pwm3_grp" };
static const char * const uart1_groups[] = { "uart1_grp" };
static const char * const uart2_groups[] = { "uart2_grp" };
static const char * const sdio_groups[] = { "sdio_pwr_grp", "sdio_1p8v_grp" };

#define NS_FUNCTION(_name, _groups, _chipsets)  \
{       \
 .name = _name,     \
 .groups = _groups,    \
 .num_groups = ARRAY_SIZE(_groups),  \
 .chipsets = _chipsets,    \
}

static const struct ns_pinctrl_function ns_pinctrl_functions[] = {
 NS_FUNCTION("spi", spi_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_FUNCTION("i2c", i2c_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_FUNCTION("mdio", mdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
 NS_FUNCTION("pwm", pwm_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_FUNCTION("uart1", uart1_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
 NS_FUNCTION("uart2", uart2_groups, FLAG_BCM4709 | FLAG_BCM53012),
 NS_FUNCTION("sdio", sdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
};

/*
 * Groups code
 */

static const struct pinctrl_ops ns_pinctrl_ops = {
 .get_groups_count = pinctrl_generic_get_group_count,
 .get_group_name = pinctrl_generic_get_group_name,
 .get_group_pins = pinctrl_generic_get_group_pins,
 .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
 .dt_free_map = pinconf_generic_dt_free_map,
};

/*
 * Functions code
 */

static int ns_pinctrl_set_mux(struct pinctrl_dev *pctrl_dev,
         unsigned int func_select,
         unsigned int group_selector)
{
 struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
 struct group_desc *group;
 u32 unset = 0;
 u32 tmp;
 int i;

 group = pinctrl_generic_get_group(pctrl_dev, group_selector);
 if (!group)
  return -EINVAL;

 for (i = 0; i < group->grp.npins; i++)
  unset |= BIT(group->grp.pins[i]);

 tmp = readl(ns_pinctrl->base);
 tmp &= ~unset;
 writel(tmp, ns_pinctrl->base);

 return 0;
}

static const struct pinmux_ops ns_pinctrl_pmxops = {
 .get_functions_count = pinmux_generic_get_function_count,
 .get_function_name = pinmux_generic_get_function_name,
 .get_function_groups = pinmux_generic_get_function_groups,
 .set_mux = ns_pinctrl_set_mux,
};

/*
 * Controller code
 */

static const struct pinctrl_desc ns_pinctrl_desc = {
 .name = "pinctrl-ns",
 .pctlops = &ns_pinctrl_ops,
 .pmxops = &ns_pinctrl_pmxops,
};

static const struct of_device_id ns_pinctrl_of_match_table[] = {
 { .compatible = "brcm,bcm4708-pinmux", .data = (void *)FLAG_BCM4708, },
 { .compatible = "brcm,bcm4709-pinmux", .data = (void *)FLAG_BCM4709, },
 { .compatible = "brcm,bcm53012-pinmux", .data = (void *)FLAG_BCM53012, },
 { }
};

static int ns_pinctrl_probe(struct platform_device *pdev)
{
 struct device *dev = &pdev->dev;
 struct ns_pinctrl *ns_pinctrl;
 struct pinctrl_desc *pctldesc;
 struct pinctrl_pin_desc *pin;
 struct resource *res;
 int i;

 ns_pinctrl = devm_kzalloc(dev, sizeof(*ns_pinctrl), GFP_KERNEL);
 if (!ns_pinctrl)
  return -ENOMEM;
 pctldesc = &ns_pinctrl->pctldesc;
 platform_set_drvdata(pdev, ns_pinctrl);

 /* Set basic properties */

 ns_pinctrl->dev = dev;

 ns_pinctrl->chipset_flag = (uintptr_t)device_get_match_data(dev);

 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
        "cru_gpio_control");
 ns_pinctrl->base = devm_ioremap_resource(dev, res);
 if (IS_ERR(ns_pinctrl->base))
  return PTR_ERR(ns_pinctrl->base);

 memcpy(pctldesc, &ns_pinctrl_desc, sizeof(*pctldesc));

 /* Set pinctrl properties */

 pctldesc->pins = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_pins),
          sizeof(struct pinctrl_pin_desc),
          GFP_KERNEL);
 if (!pctldesc->pins)
  return -ENOMEM;
 for (i = 0, pin = (struct pinctrl_pin_desc *)&pctldesc->pins[0];
      i < ARRAY_SIZE(ns_pinctrl_pins); i++) {
  const struct pinctrl_pin_desc *src = &ns_pinctrl_pins[i];
  unsigned int chipsets = (uintptr_t)src->drv_data;

  if (chipsets & ns_pinctrl->chipset_flag) {
   memcpy(pin++, src, sizeof(*src));
   pctldesc->npins++;
  }
 }

 /* Register */

 ns_pinctrl->pctldev = devm_pinctrl_register(dev, pctldesc, ns_pinctrl);
 if (IS_ERR(ns_pinctrl->pctldev)) {
  dev_err(dev, "Failed to register pinctrl\n");
  return PTR_ERR(ns_pinctrl->pctldev);
 }

 for (i = 0; i < ARRAY_SIZE(ns_pinctrl_groups); i++) {
  const struct ns_pinctrl_group *group = &ns_pinctrl_groups[i];

  if (!(group->chipsets & ns_pinctrl->chipset_flag))
   continue;

  pinctrl_generic_add_group(ns_pinctrl->pctldev, group->name,
       group->pins, group->num_pins, NULL);
 }

 for (i = 0; i < ARRAY_SIZE(ns_pinctrl_functions); i++) {
  const struct ns_pinctrl_function *function = &ns_pinctrl_functions[i];

  if (!(function->chipsets & ns_pinctrl->chipset_flag))
   continue;

  pinmux_generic_add_function(ns_pinctrl->pctldev, function->name,
         function->groups,
         function->num_groups, NULL);
 }

 return 0;
}

static struct platform_driver ns_pinctrl_driver = {
 .probe = ns_pinctrl_probe,
 .driver = {
  .name = "ns-pinmux",
  .of_match_table = ns_pinctrl_of_match_table,
 },
};

module_platform_driver(ns_pinctrl_driver);

MODULE_AUTHOR("Rafał Miłecki");
MODULE_DEVICE_TABLE(of, ns_pinctrl_of_match_table);