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Diffstat (limited to '')
| -rw-r--r-- | drivers/pinctrl/bcm/pinctrl-nsp-mux.c | 642 |
1 files changed, 642 insertions, 0 deletions
diff --git a/drivers/pinctrl/bcm/pinctrl-nsp-mux.c b/drivers/pinctrl/bcm/pinctrl-nsp-mux.c new file mode 100644 index 000000000..f1d60a708 --- /dev/null +++ b/drivers/pinctrl/bcm/pinctrl-nsp-mux.c @@ -0,0 +1,642 @@ +/* Copyright (C) 2015 Broadcom Corporation + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * This file contains the Northstar plus (NSP) IOMUX driver that supports + * group based PINMUX configuration. The Northstar plus IOMUX controller + * allows pins to be individually muxed to GPIO function. The NAND and MMC is + * a group based selection. The gpio_a 8 - 11 are muxed with gpio_b and pwm. + * To select PWM, one need to enable the corresponding gpio_b as well. + * + * gpio_a (8 - 11) + * +---------- + * | + * gpio_a (8-11) | gpio_b (0 - 3) + * ------------------------+-------+---------- + * | + * | pwm (0 - 3) + * +---------- + */ + +#include <linux/err.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include "../core.h" +#include "../pinctrl-utils.h" + +#define NSP_MUX_BASE0 0x00 +#define NSP_MUX_BASE1 0x01 +#define NSP_MUX_BASE2 0x02 +/* + * nsp IOMUX register description + * + * @base: base 0 or base 1 + * @shift: bit shift for mux configuration of a group + * @mask: bit mask of the function + * @alt: alternate function to set to + */ +struct nsp_mux { + unsigned int base; + unsigned int shift; + unsigned int mask; + unsigned int alt; +}; + +/* + * Keep track of nsp IOMUX configuration and prevent double configuration + * + * @nsp_mux: nsp IOMUX register description + * @is_configured: flag to indicate whether a mux setting has already been + * configured + */ +struct nsp_mux_log { + struct nsp_mux mux; + bool is_configured; +}; + +/* + * Group based IOMUX configuration + * + * @name: name of the group + * @pins: array of pins used by this group + * @num_pins: total number of pins used by this group + * @mux: nsp group based IOMUX configuration + */ +struct nsp_pin_group { + const char *name; + const unsigned int *pins; + const unsigned int num_pins; + const struct nsp_mux mux; +}; + +/* + * nsp mux function and supported pin groups + * + * @name: name of the function + * @groups: array of groups that can be supported by this function + * @num_groups: total number of groups that can be supported by this function + */ +struct nsp_pin_function { + const char *name; + const char * const *groups; + const unsigned int num_groups; +}; + +/* + * nsp IOMUX pinctrl core + * + * @pctl: pointer to pinctrl_dev + * @dev: pointer to device + * @base0: first mux register + * @base1: second mux register + * @base2: third mux register + * @groups: pointer to array of groups + * @num_groups: total number of groups + * @functions: pointer to array of functions + * @num_functions: total number of functions + * @mux_log: pointer to the array of mux logs + * @lock: lock to protect register access + */ +struct nsp_pinctrl { + struct pinctrl_dev *pctl; + struct device *dev; + void __iomem *base0; + void __iomem *base1; + void __iomem *base2; + const struct nsp_pin_group *groups; + unsigned int num_groups; + const struct nsp_pin_function *functions; + unsigned int num_functions; + struct nsp_mux_log *mux_log; + spinlock_t lock; +}; + +/* + * Description of a pin in nsp + * + * @pin: pin number + * @name: pin name + * @gpio_select: reg data to select GPIO + */ +struct nsp_pin { + unsigned int pin; + char *name; + unsigned int gpio_select; +}; + +#define NSP_PIN_DESC(p, n, g) \ +{ \ + .pin = p, \ + .name = n, \ + .gpio_select = g, \ +} + +/* + * List of muxable pins in nsp + */ +static struct nsp_pin nsp_pins[] = { + NSP_PIN_DESC(0, "spi_clk", 1), + NSP_PIN_DESC(1, "spi_ss", 1), + NSP_PIN_DESC(2, "spi_mosi", 1), + NSP_PIN_DESC(3, "spi_miso", 1), + NSP_PIN_DESC(4, "scl", 1), + NSP_PIN_DESC(5, "sda", 1), + NSP_PIN_DESC(6, "mdc", 1), + NSP_PIN_DESC(7, "mdio", 1), + NSP_PIN_DESC(8, "pwm0", 1), + NSP_PIN_DESC(9, "pwm1", 1), + NSP_PIN_DESC(10, "pwm2", 1), + NSP_PIN_DESC(11, "pwm3", 1), + NSP_PIN_DESC(12, "uart1_rx", 1), + NSP_PIN_DESC(13, "uart1_tx", 1), + NSP_PIN_DESC(14, "uart1_cts", 1), + NSP_PIN_DESC(15, "uart1_rts", 1), + NSP_PIN_DESC(16, "uart2_rx", 1), + NSP_PIN_DESC(17, "uart2_tx", 1), + NSP_PIN_DESC(18, "synce", 0), + NSP_PIN_DESC(19, "sata0_led", 0), + NSP_PIN_DESC(20, "sata1_led", 0), + NSP_PIN_DESC(21, "xtal_out", 1), + NSP_PIN_DESC(22, "sdio_pwr", 1), + NSP_PIN_DESC(23, "sdio_en_1p8v", 1), + NSP_PIN_DESC(24, "gpio_24", 1), + NSP_PIN_DESC(25, "gpio_25", 1), + NSP_PIN_DESC(26, "p5_led0", 0), + NSP_PIN_DESC(27, "p5_led1", 0), + NSP_PIN_DESC(28, "gpio_28", 1), + NSP_PIN_DESC(29, "gpio_29", 1), + NSP_PIN_DESC(30, "gpio_30", 1), + NSP_PIN_DESC(31, "gpio_31", 1), + NSP_PIN_DESC(32, "nand_ale", 0), + NSP_PIN_DESC(33, "nand_ce0", 0), + NSP_PIN_DESC(34, "nand_r/b", 0), + NSP_PIN_DESC(35, "nand_dq0", 0), + NSP_PIN_DESC(36, "nand_dq1", 0), + NSP_PIN_DESC(37, "nand_dq2", 0), + NSP_PIN_DESC(38, "nand_dq3", 0), + NSP_PIN_DESC(39, "nand_dq4", 0), + NSP_PIN_DESC(40, "nand_dq5", 0), + NSP_PIN_DESC(41, "nand_dq6", 0), + NSP_PIN_DESC(42, "nand_dq7", 0), +}; + +/* + * List of groups of pins + */ + +static const unsigned int spi_pins[] = {0, 1, 2, 3}; +static const unsigned int i2c_pins[] = {4, 5}; +static const unsigned int mdio_pins[] = {6, 7}; +static const unsigned int pwm0_pins[] = {8}; +static const unsigned int gpio_b_0_pins[] = {8}; +static const unsigned int pwm1_pins[] = {9}; +static const unsigned int gpio_b_1_pins[] = {9}; +static const unsigned int pwm2_pins[] = {10}; +static const unsigned int gpio_b_2_pins[] = {10}; +static const unsigned int pwm3_pins[] = {11}; +static const unsigned int gpio_b_3_pins[] = {11}; +static const unsigned int uart1_pins[] = {12, 13, 14, 15}; +static const unsigned int uart2_pins[] = {16, 17}; +static const unsigned int synce_pins[] = {18}; +static const unsigned int sata0_led_pins[] = {19}; +static const unsigned int sata1_led_pins[] = {20}; +static const unsigned int xtal_out_pins[] = {21}; +static const unsigned int sdio_pwr_pins[] = {22}; +static const unsigned int sdio_1p8v_pins[] = {23}; +static const unsigned int switch_p05_led0_pins[] = {26}; +static const unsigned int switch_p05_led1_pins[] = {27}; +static const unsigned int nand_pins[] = {32, 33, 34, 35, 36, 37, 38, 39, + 40, 41, 42}; +static const unsigned int emmc_pins[] = {32, 33, 34, 35, 36, 37, 38, 39, + 40, 41, 42}; + +#define NSP_PIN_GROUP(group_name, ba, sh, ma, al) \ +{ \ + .name = __stringify(group_name) "_grp", \ + .pins = group_name ## _pins, \ + .num_pins = ARRAY_SIZE(group_name ## _pins), \ + .mux = { \ + .base = ba, \ + .shift = sh, \ + .mask = ma, \ + .alt = al, \ + } \ +} + +/* + * List of nsp pin groups + */ +static const struct nsp_pin_group nsp_pin_groups[] = { + NSP_PIN_GROUP(spi, NSP_MUX_BASE0, 0, 0x0f, 0x00), + NSP_PIN_GROUP(i2c, NSP_MUX_BASE0, 3, 0x03, 0x00), + NSP_PIN_GROUP(mdio, NSP_MUX_BASE0, 5, 0x03, 0x00), + NSP_PIN_GROUP(gpio_b_0, NSP_MUX_BASE0, 7, 0x01, 0x00), + NSP_PIN_GROUP(pwm0, NSP_MUX_BASE1, 0, 0x01, 0x01), + NSP_PIN_GROUP(gpio_b_1, NSP_MUX_BASE0, 8, 0x01, 0x00), + NSP_PIN_GROUP(pwm1, NSP_MUX_BASE1, 1, 0x01, 0x01), + NSP_PIN_GROUP(gpio_b_2, NSP_MUX_BASE0, 9, 0x01, 0x00), + NSP_PIN_GROUP(pwm2, NSP_MUX_BASE1, 2, 0x01, 0x01), + NSP_PIN_GROUP(gpio_b_3, NSP_MUX_BASE0, 10, 0x01, 0x00), + NSP_PIN_GROUP(pwm3, NSP_MUX_BASE1, 3, 0x01, 0x01), + NSP_PIN_GROUP(uart1, NSP_MUX_BASE0, 11, 0x0f, 0x00), + NSP_PIN_GROUP(uart2, NSP_MUX_BASE0, 15, 0x03, 0x00), + NSP_PIN_GROUP(synce, NSP_MUX_BASE0, 17, 0x01, 0x01), + NSP_PIN_GROUP(sata0_led, NSP_MUX_BASE0, 18, 0x01, 0x01), + NSP_PIN_GROUP(sata1_led, NSP_MUX_BASE0, 19, 0x01, 0x01), + NSP_PIN_GROUP(xtal_out, NSP_MUX_BASE0, 20, 0x01, 0x00), + NSP_PIN_GROUP(sdio_pwr, NSP_MUX_BASE0, 21, 0x01, 0x00), + NSP_PIN_GROUP(sdio_1p8v, NSP_MUX_BASE0, 22, 0x01, 0x00), + NSP_PIN_GROUP(switch_p05_led0, NSP_MUX_BASE0, 26, 0x01, 0x01), + NSP_PIN_GROUP(switch_p05_led1, NSP_MUX_BASE0, 27, 0x01, 0x01), + NSP_PIN_GROUP(nand, NSP_MUX_BASE2, 0, 0x01, 0x00), + NSP_PIN_GROUP(emmc, NSP_MUX_BASE2, 0, 0x01, 0x01) +}; + +/* + * List of groups supported by functions + */ + +static const char * const spi_grps[] = {"spi_grp"}; +static const char * const i2c_grps[] = {"i2c_grp"}; +static const char * const mdio_grps[] = {"mdio_grp"}; +static const char * const pwm_grps[] = {"pwm0_grp", "pwm1_grp", "pwm2_grp" + , "pwm3_grp"}; +static const char * const gpio_b_grps[] = {"gpio_b_0_grp", "gpio_b_1_grp", + "gpio_b_2_grp", "gpio_b_3_grp"}; +static const char * const uart1_grps[] = {"uart1_grp"}; +static const char * const uart2_grps[] = {"uart2_grp"}; +static const char * const synce_grps[] = {"synce_grp"}; +static const char * const sata_led_grps[] = {"sata0_led_grp", "sata1_led_grp"}; +static const char * const xtal_out_grps[] = {"xtal_out_grp"}; +static const char * const sdio_grps[] = {"sdio_pwr_grp", "sdio_1p8v_grp"}; +static const char * const switch_led_grps[] = {"switch_p05_led0_grp", + "switch_p05_led1_grp"}; +static const char * const nand_grps[] = {"nand_grp"}; +static const char * const emmc_grps[] = {"emmc_grp"}; + +#define NSP_PIN_FUNCTION(func) \ +{ \ + .name = #func, \ + .groups = func ## _grps, \ + .num_groups = ARRAY_SIZE(func ## _grps), \ +} + +/* + * List of supported functions in nsp + */ +static const struct nsp_pin_function nsp_pin_functions[] = { + NSP_PIN_FUNCTION(spi), + NSP_PIN_FUNCTION(i2c), + NSP_PIN_FUNCTION(mdio), + NSP_PIN_FUNCTION(pwm), + NSP_PIN_FUNCTION(gpio_b), + NSP_PIN_FUNCTION(uart1), + NSP_PIN_FUNCTION(uart2), + NSP_PIN_FUNCTION(synce), + NSP_PIN_FUNCTION(sata_led), + NSP_PIN_FUNCTION(xtal_out), + NSP_PIN_FUNCTION(sdio), + NSP_PIN_FUNCTION(switch_led), + NSP_PIN_FUNCTION(nand), + NSP_PIN_FUNCTION(emmc) +}; + +static int nsp_get_groups_count(struct pinctrl_dev *pctrl_dev) +{ + struct nsp_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev); + + return pinctrl->num_groups; +} + +static const char *nsp_get_group_name(struct pinctrl_dev *pctrl_dev, + unsigned int selector) +{ + struct nsp_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev); + + return pinctrl->groups[selector].name; +} + +static int nsp_get_group_pins(struct pinctrl_dev *pctrl_dev, + unsigned int selector, const unsigned int **pins, + unsigned int *num_pins) +{ + struct nsp_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev); + + *pins = pinctrl->groups[selector].pins; + *num_pins = pinctrl->groups[selector].num_pins; + + return 0; +} + +static void nsp_pin_dbg_show(struct pinctrl_dev *pctrl_dev, + struct seq_file *s, unsigned int offset) +{ + seq_printf(s, " %s", dev_name(pctrl_dev->dev)); +} + +static const struct pinctrl_ops nsp_pinctrl_ops = { + .get_groups_count = nsp_get_groups_count, + .get_group_name = nsp_get_group_name, + .get_group_pins = nsp_get_group_pins, + .pin_dbg_show = nsp_pin_dbg_show, + .dt_node_to_map = pinconf_generic_dt_node_to_map_group, + .dt_free_map = pinctrl_utils_free_map, +}; + +static int nsp_get_functions_count(struct pinctrl_dev *pctrl_dev) +{ + struct nsp_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev); + + return pinctrl->num_functions; +} + +static const char *nsp_get_function_name(struct pinctrl_dev *pctrl_dev, + unsigned int selector) +{ + struct nsp_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev); + + return pinctrl->functions[selector].name; +} + +static int nsp_get_function_groups(struct pinctrl_dev *pctrl_dev, + unsigned int selector, + const char * const **groups, + unsigned * const num_groups) +{ + struct nsp_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev); + + *groups = pinctrl->functions[selector].groups; + *num_groups = pinctrl->functions[selector].num_groups; + + return 0; +} + +static int nsp_pinmux_set(struct nsp_pinctrl *pinctrl, + const struct nsp_pin_function *func, + const struct nsp_pin_group *grp, + struct nsp_mux_log *mux_log) +{ + const struct nsp_mux *mux = &grp->mux; + int i; + u32 val, mask; + unsigned long flags; + void __iomem *base_address; + + for (i = 0; i < pinctrl->num_groups; i++) { + if ((mux->shift != mux_log[i].mux.shift) || + (mux->base != mux_log[i].mux.base)) + continue; + + /* if this is a new configuration, just do it! */ + if (!mux_log[i].is_configured) + break; + + /* + * IOMUX has been configured previously and one is trying to + * configure it to a different function + */ + if (mux_log[i].mux.alt != mux->alt) { + dev_err(pinctrl->dev, + "double configuration error detected!\n"); + dev_err(pinctrl->dev, "func:%s grp:%s\n", + func->name, grp->name); + return -EINVAL; + } + + return 0; + } + if (i == pinctrl->num_groups) + return -EINVAL; + + mask = mux->mask; + mux_log[i].mux.alt = mux->alt; + mux_log[i].is_configured = true; + + switch (mux->base) { + case NSP_MUX_BASE0: + base_address = pinctrl->base0; + break; + + case NSP_MUX_BASE1: + base_address = pinctrl->base1; + break; + + case NSP_MUX_BASE2: + base_address = pinctrl->base2; + break; + + default: + return -EINVAL; + } + + spin_lock_irqsave(&pinctrl->lock, flags); + val = readl(base_address); + val &= ~(mask << grp->mux.shift); + val |= grp->mux.alt << grp->mux.shift; + writel(val, base_address); + spin_unlock_irqrestore(&pinctrl->lock, flags); + + return 0; +} + +static int nsp_pinmux_enable(struct pinctrl_dev *pctrl_dev, + unsigned int func_select, unsigned int grp_select) +{ + struct nsp_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev); + const struct nsp_pin_function *func; + const struct nsp_pin_group *grp; + + if (grp_select >= pinctrl->num_groups || + func_select >= pinctrl->num_functions) + return -EINVAL; + + func = &pinctrl->functions[func_select]; + grp = &pinctrl->groups[grp_select]; + + dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n", + func_select, func->name, grp_select, grp->name); + + dev_dbg(pctrl_dev->dev, "shift:%u alt:%u\n", grp->mux.shift, + grp->mux.alt); + + return nsp_pinmux_set(pinctrl, func, grp, pinctrl->mux_log); +} + + +static int nsp_gpio_request_enable(struct pinctrl_dev *pctrl_dev, + struct pinctrl_gpio_range *range, + unsigned int pin) +{ + struct nsp_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev); + u32 *gpio_select = pctrl_dev->desc->pins[pin].drv_data; + u32 val; + unsigned long flags; + + spin_lock_irqsave(&pinctrl->lock, flags); + val = readl(pinctrl->base0); + if ((val & BIT(pin)) != (*gpio_select << pin)) { + val &= ~BIT(pin); + val |= *gpio_select << pin; + writel(val, pinctrl->base0); + } + spin_unlock_irqrestore(&pinctrl->lock, flags); + + return 0; +} + +static void nsp_gpio_disable_free(struct pinctrl_dev *pctrl_dev, + struct pinctrl_gpio_range *range, + unsigned int pin) +{ + struct nsp_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev); + u32 *gpio_select = pctrl_dev->desc->pins[pin].drv_data; + u32 val; + unsigned long flags; + + spin_lock_irqsave(&pinctrl->lock, flags); + val = readl(pinctrl->base0); + if ((val & (1 << pin)) == (*gpio_select << pin)) { + val &= ~(1 << pin); + if (!(*gpio_select)) + val |= (1 << pin); + writel(val, pinctrl->base0); + } + spin_unlock_irqrestore(&pinctrl->lock, flags); +} + +static const struct pinmux_ops nsp_pinmux_ops = { + .get_functions_count = nsp_get_functions_count, + .get_function_name = nsp_get_function_name, + .get_function_groups = nsp_get_function_groups, + .set_mux = nsp_pinmux_enable, + .gpio_request_enable = nsp_gpio_request_enable, + .gpio_disable_free = nsp_gpio_disable_free, +}; + +static struct pinctrl_desc nsp_pinctrl_desc = { + .name = "nsp-pinmux", + .pctlops = &nsp_pinctrl_ops, + .pmxops = &nsp_pinmux_ops, +}; + +static int nsp_mux_log_init(struct nsp_pinctrl *pinctrl) +{ + struct nsp_mux_log *log; + unsigned int i; + u32 no_of_groups = ARRAY_SIZE(nsp_pin_groups); + + pinctrl->mux_log = devm_kcalloc(pinctrl->dev, no_of_groups, + sizeof(struct nsp_mux_log), + GFP_KERNEL); + if (!pinctrl->mux_log) + return -ENOMEM; + + for (i = 0; i < no_of_groups; i++) { + log = &pinctrl->mux_log[i]; + log->mux.base = nsp_pin_groups[i].mux.base; + log->mux.shift = nsp_pin_groups[i].mux.shift; + log->mux.alt = 0; + log->is_configured = false; + } + + return 0; +} + +static int nsp_pinmux_probe(struct platform_device *pdev) +{ + struct nsp_pinctrl *pinctrl; + struct resource *res; + int i, ret; + struct pinctrl_pin_desc *pins; + unsigned int num_pins = ARRAY_SIZE(nsp_pins); + + pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL); + if (!pinctrl) + return -ENOMEM; + pinctrl->dev = &pdev->dev; + platform_set_drvdata(pdev, pinctrl); + spin_lock_init(&pinctrl->lock); + + pinctrl->base0 = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(pinctrl->base0)) + return PTR_ERR(pinctrl->base0); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) + return -EINVAL; + pinctrl->base1 = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!pinctrl->base1) { + dev_err(&pdev->dev, "unable to map I/O space\n"); + return -ENOMEM; + } + + pinctrl->base2 = devm_platform_ioremap_resource(pdev, 2); + if (IS_ERR(pinctrl->base2)) + return PTR_ERR(pinctrl->base2); + + ret = nsp_mux_log_init(pinctrl); + if (ret) { + dev_err(&pdev->dev, "unable to initialize IOMUX log\n"); + return ret; + } + + pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL); + if (!pins) + return -ENOMEM; + + for (i = 0; i < num_pins; i++) { + pins[i].number = nsp_pins[i].pin; + pins[i].name = nsp_pins[i].name; + pins[i].drv_data = &nsp_pins[i].gpio_select; + } + + pinctrl->groups = nsp_pin_groups; + pinctrl->num_groups = ARRAY_SIZE(nsp_pin_groups); + pinctrl->functions = nsp_pin_functions; + pinctrl->num_functions = ARRAY_SIZE(nsp_pin_functions); + nsp_pinctrl_desc.pins = pins; + nsp_pinctrl_desc.npins = num_pins; + + pinctrl->pctl = devm_pinctrl_register(&pdev->dev, &nsp_pinctrl_desc, + pinctrl); + if (IS_ERR(pinctrl->pctl)) { + dev_err(&pdev->dev, "unable to register nsp IOMUX pinctrl\n"); + return PTR_ERR(pinctrl->pctl); + } + + return 0; +} + +static const struct of_device_id nsp_pinmux_of_match[] = { + { .compatible = "brcm,nsp-pinmux" }, + { } +}; + +static struct platform_driver nsp_pinmux_driver = { + .driver = { + .name = "nsp-pinmux", + .of_match_table = nsp_pinmux_of_match, + }, + .probe = nsp_pinmux_probe, +}; + +static int __init nsp_pinmux_init(void) +{ + return platform_driver_register(&nsp_pinmux_driver); +} +arch_initcall(nsp_pinmux_init); |