373 lines
11 KiB
C
373 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018 Rafał Miłecki <rafal@milecki.pl>
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinmux.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#define FLAG_BCM4708 BIT(1)
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#define FLAG_BCM4709 BIT(2)
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#define FLAG_BCM53012 BIT(3)
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struct ns_pinctrl {
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struct device *dev;
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unsigned int chipset_flag;
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struct pinctrl_dev *pctldev;
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void __iomem *base;
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struct pinctrl_desc pctldesc;
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struct ns_pinctrl_group *groups;
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unsigned int num_groups;
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struct ns_pinctrl_function *functions;
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unsigned int num_functions;
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};
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/*
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* Pins
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*/
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static const struct pinctrl_pin_desc ns_pinctrl_pins[] = {
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{ 0, "spi_clk", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 1, "spi_ss", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 2, "spi_mosi", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 3, "spi_miso", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 4, "i2c_scl", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 5, "i2c_sda", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 6, "mdc", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
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{ 7, "mdio", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
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{ 8, "pwm0", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 9, "pwm1", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 10, "pwm2", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 11, "pwm3", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 12, "uart1_rx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 13, "uart1_tx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 14, "uart1_cts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 15, "uart1_rts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
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{ 16, "uart2_rx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
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{ 17, "uart2_tx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
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/* TODO { ??, "xtal_out", (void *)(FLAG_BCM4709) }, */
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{ 22, "sdio_pwr", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
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{ 23, "sdio_en_1p8v", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
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};
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/*
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* Groups
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*/
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struct ns_pinctrl_group {
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const char *name;
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const unsigned int *pins;
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const unsigned int num_pins;
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unsigned int chipsets;
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};
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static const unsigned int spi_pins[] = { 0, 1, 2, 3 };
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static const unsigned int i2c_pins[] = { 4, 5 };
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static const unsigned int mdio_pins[] = { 6, 7 };
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static const unsigned int pwm0_pins[] = { 8 };
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static const unsigned int pwm1_pins[] = { 9 };
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static const unsigned int pwm2_pins[] = { 10 };
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static const unsigned int pwm3_pins[] = { 11 };
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static const unsigned int uart1_pins[] = { 12, 13, 14, 15 };
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static const unsigned int uart2_pins[] = { 16, 17 };
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static const unsigned int sdio_pwr_pins[] = { 22 };
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static const unsigned int sdio_1p8v_pins[] = { 23 };
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#define NS_GROUP(_name, _pins, _chipsets) \
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{ \
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.name = _name, \
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.pins = _pins, \
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.num_pins = ARRAY_SIZE(_pins), \
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.chipsets = _chipsets, \
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}
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static const struct ns_pinctrl_group ns_pinctrl_groups[] = {
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NS_GROUP("spi_grp", spi_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_GROUP("i2c_grp", i2c_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_GROUP("mdio_grp", mdio_pins, FLAG_BCM4709 | FLAG_BCM53012),
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NS_GROUP("pwm0_grp", pwm0_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_GROUP("pwm1_grp", pwm1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_GROUP("pwm2_grp", pwm2_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_GROUP("pwm3_grp", pwm3_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_GROUP("uart1_grp", uart1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_GROUP("uart2_grp", uart2_pins, FLAG_BCM4709 | FLAG_BCM53012),
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NS_GROUP("sdio_pwr_grp", sdio_pwr_pins, FLAG_BCM4709 | FLAG_BCM53012),
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NS_GROUP("sdio_1p8v_grp", sdio_1p8v_pins, FLAG_BCM4709 | FLAG_BCM53012),
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};
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/*
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* Functions
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*/
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struct ns_pinctrl_function {
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const char *name;
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const char * const *groups;
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const unsigned int num_groups;
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unsigned int chipsets;
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};
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static const char * const spi_groups[] = { "spi_grp" };
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static const char * const i2c_groups[] = { "i2c_grp" };
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static const char * const mdio_groups[] = { "mdio_grp" };
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static const char * const pwm_groups[] = { "pwm0_grp", "pwm1_grp", "pwm2_grp",
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"pwm3_grp" };
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static const char * const uart1_groups[] = { "uart1_grp" };
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static const char * const uart2_groups[] = { "uart2_grp" };
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static const char * const sdio_groups[] = { "sdio_pwr_grp", "sdio_1p8v_grp" };
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#define NS_FUNCTION(_name, _groups, _chipsets) \
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{ \
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.name = _name, \
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.groups = _groups, \
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.num_groups = ARRAY_SIZE(_groups), \
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.chipsets = _chipsets, \
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}
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static const struct ns_pinctrl_function ns_pinctrl_functions[] = {
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NS_FUNCTION("spi", spi_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_FUNCTION("i2c", i2c_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_FUNCTION("mdio", mdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
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NS_FUNCTION("pwm", pwm_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_FUNCTION("uart1", uart1_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
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NS_FUNCTION("uart2", uart2_groups, FLAG_BCM4709 | FLAG_BCM53012),
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NS_FUNCTION("sdio", sdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
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};
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/*
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* Groups code
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*/
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static int ns_pinctrl_get_groups_count(struct pinctrl_dev *pctrl_dev)
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{
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struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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return ns_pinctrl->num_groups;
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}
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static const char *ns_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
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unsigned int selector)
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{
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struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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return ns_pinctrl->groups[selector].name;
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}
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static int ns_pinctrl_get_group_pins(struct pinctrl_dev *pctrl_dev,
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unsigned int selector,
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const unsigned int **pins,
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unsigned int *num_pins)
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{
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struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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*pins = ns_pinctrl->groups[selector].pins;
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*num_pins = ns_pinctrl->groups[selector].num_pins;
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return 0;
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}
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static const struct pinctrl_ops ns_pinctrl_ops = {
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.get_groups_count = ns_pinctrl_get_groups_count,
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.get_group_name = ns_pinctrl_get_group_name,
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.get_group_pins = ns_pinctrl_get_group_pins,
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.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
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.dt_free_map = pinconf_generic_dt_free_map,
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};
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/*
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* Functions code
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*/
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static int ns_pinctrl_get_functions_count(struct pinctrl_dev *pctrl_dev)
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{
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struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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return ns_pinctrl->num_functions;
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}
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static const char *ns_pinctrl_get_function_name(struct pinctrl_dev *pctrl_dev,
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unsigned int selector)
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{
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struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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return ns_pinctrl->functions[selector].name;
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}
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static int ns_pinctrl_get_function_groups(struct pinctrl_dev *pctrl_dev,
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unsigned int selector,
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const char * const **groups,
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unsigned * const num_groups)
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{
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struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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*groups = ns_pinctrl->functions[selector].groups;
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*num_groups = ns_pinctrl->functions[selector].num_groups;
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return 0;
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}
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static int ns_pinctrl_set_mux(struct pinctrl_dev *pctrl_dev,
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unsigned int func_select,
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unsigned int grp_select)
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{
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struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
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u32 unset = 0;
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u32 tmp;
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int i;
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for (i = 0; i < ns_pinctrl->groups[grp_select].num_pins; i++) {
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int pin_number = ns_pinctrl->groups[grp_select].pins[i];
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unset |= BIT(pin_number);
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}
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tmp = readl(ns_pinctrl->base);
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tmp &= ~unset;
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writel(tmp, ns_pinctrl->base);
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return 0;
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}
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static const struct pinmux_ops ns_pinctrl_pmxops = {
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.get_functions_count = ns_pinctrl_get_functions_count,
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.get_function_name = ns_pinctrl_get_function_name,
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.get_function_groups = ns_pinctrl_get_function_groups,
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.set_mux = ns_pinctrl_set_mux,
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};
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/*
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* Controller code
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*/
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static struct pinctrl_desc ns_pinctrl_desc = {
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.name = "pinctrl-ns",
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.pctlops = &ns_pinctrl_ops,
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.pmxops = &ns_pinctrl_pmxops,
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};
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static const struct of_device_id ns_pinctrl_of_match_table[] = {
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{ .compatible = "brcm,bcm4708-pinmux", .data = (void *)FLAG_BCM4708, },
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{ .compatible = "brcm,bcm4709-pinmux", .data = (void *)FLAG_BCM4709, },
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{ .compatible = "brcm,bcm53012-pinmux", .data = (void *)FLAG_BCM53012, },
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{ }
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};
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static int ns_pinctrl_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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const struct of_device_id *of_id;
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struct ns_pinctrl *ns_pinctrl;
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struct pinctrl_desc *pctldesc;
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struct pinctrl_pin_desc *pin;
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struct ns_pinctrl_group *group;
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struct ns_pinctrl_function *function;
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struct resource *res;
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int i;
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ns_pinctrl = devm_kzalloc(dev, sizeof(*ns_pinctrl), GFP_KERNEL);
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if (!ns_pinctrl)
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return -ENOMEM;
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pctldesc = &ns_pinctrl->pctldesc;
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platform_set_drvdata(pdev, ns_pinctrl);
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/* Set basic properties */
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ns_pinctrl->dev = dev;
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of_id = of_match_device(ns_pinctrl_of_match_table, dev);
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if (!of_id)
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return -EINVAL;
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ns_pinctrl->chipset_flag = (uintptr_t)of_id->data;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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"cru_gpio_control");
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ns_pinctrl->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(ns_pinctrl->base)) {
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dev_err(dev, "Failed to map pinctrl regs\n");
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return PTR_ERR(ns_pinctrl->base);
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}
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memcpy(pctldesc, &ns_pinctrl_desc, sizeof(*pctldesc));
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/* Set pinctrl properties */
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pctldesc->pins = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_pins),
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sizeof(struct pinctrl_pin_desc),
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GFP_KERNEL);
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if (!pctldesc->pins)
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return -ENOMEM;
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for (i = 0, pin = (struct pinctrl_pin_desc *)&pctldesc->pins[0];
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i < ARRAY_SIZE(ns_pinctrl_pins); i++) {
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const struct pinctrl_pin_desc *src = &ns_pinctrl_pins[i];
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unsigned int chipsets = (uintptr_t)src->drv_data;
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if (chipsets & ns_pinctrl->chipset_flag) {
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memcpy(pin++, src, sizeof(*src));
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pctldesc->npins++;
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}
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}
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ns_pinctrl->groups = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_groups),
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sizeof(struct ns_pinctrl_group),
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GFP_KERNEL);
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if (!ns_pinctrl->groups)
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return -ENOMEM;
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for (i = 0, group = &ns_pinctrl->groups[0];
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i < ARRAY_SIZE(ns_pinctrl_groups); i++) {
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const struct ns_pinctrl_group *src = &ns_pinctrl_groups[i];
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if (src->chipsets & ns_pinctrl->chipset_flag) {
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memcpy(group++, src, sizeof(*src));
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ns_pinctrl->num_groups++;
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}
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}
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ns_pinctrl->functions = devm_kcalloc(dev,
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ARRAY_SIZE(ns_pinctrl_functions),
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sizeof(struct ns_pinctrl_function),
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GFP_KERNEL);
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if (!ns_pinctrl->functions)
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return -ENOMEM;
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for (i = 0, function = &ns_pinctrl->functions[0];
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i < ARRAY_SIZE(ns_pinctrl_functions); i++) {
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const struct ns_pinctrl_function *src = &ns_pinctrl_functions[i];
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if (src->chipsets & ns_pinctrl->chipset_flag) {
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memcpy(function++, src, sizeof(*src));
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ns_pinctrl->num_functions++;
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}
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}
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/* Register */
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ns_pinctrl->pctldev = devm_pinctrl_register(dev, pctldesc, ns_pinctrl);
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if (IS_ERR(ns_pinctrl->pctldev)) {
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dev_err(dev, "Failed to register pinctrl\n");
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return PTR_ERR(ns_pinctrl->pctldev);
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}
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return 0;
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}
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static struct platform_driver ns_pinctrl_driver = {
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.probe = ns_pinctrl_probe,
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.driver = {
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.name = "ns-pinmux",
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.of_match_table = ns_pinctrl_of_match_table,
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},
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};
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module_platform_driver(ns_pinctrl_driver);
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MODULE_AUTHOR("Rafał Miłecki");
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MODULE_LICENSE("GPL v2");
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MODULE_DEVICE_TABLE(of, ns_pinctrl_of_match_table);
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