From: Patrice Chotard patrice.chotard@st.com
Add STMicroelectronics STiH410 pinctrl driver
Signed-off-by: Patrice Chotard patrice.chotard@st.com Reviewed-by: Tom Rini trini@konsulko.com --- drivers/pinctrl/Kconfig | 10 ++ drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinctrl-sti.c | 320 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 331 insertions(+) create mode 100644 drivers/pinctrl/pinctrl-sti.c
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index efcb4c0..0c832e1 100644 --- a/drivers/pinctrl/Kconfig +++ b/drivers/pinctrl/Kconfig @@ -175,6 +175,16 @@ config PIC32_PINCTRL by a device tree node which contains both GPIO defintion and pin control functions.
+config PINCTRL_STI + bool "STMicroelectronics STi pin-control and pin-mux driver" + depends on DM && ARCH_STI + default y + help + Support pin multiplexing control on STMicrolectronics STi SoCs. + The driver is controlled by a device tree node which contains both + the GPIO definitions and pin control functions for each available multiplex + function. + endif
source "drivers/pinctrl/meson/Kconfig" diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile index 512112a..a2f8101 100644 --- a/drivers/pinctrl/Makefile +++ b/drivers/pinctrl/Makefile @@ -16,3 +16,4 @@ obj-$(CONFIG_PIC32_PINCTRL) += pinctrl_pic32.o obj-$(CONFIG_PINCTRL_EXYNOS) += exynos/ obj-$(CONFIG_PINCTRL_MESON) += meson/ obj-$(CONFIG_PINCTRL_MVEBU) += mvebu/ +obj-$(CONFIG_PINCTRL_STI) += pinctrl-sti.o diff --git a/drivers/pinctrl/pinctrl-sti.c b/drivers/pinctrl/pinctrl-sti.c new file mode 100644 index 0000000..6ee7fa7 --- /dev/null +++ b/drivers/pinctrl/pinctrl-sti.c @@ -0,0 +1,320 @@ +/* + * Pinctrl driver for STMicroelectronics STi SoCs + * + * Copyright (c) 2017 + * Patrice Chotard patrice.chotard@st.com + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <bitfield.h> +#include <dm.h> +#include <errno.h> +#include <regmap.h> +#include <syscon.h> +#include <asm/io.h> +#include <dm/pinctrl.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define MAX_STI_PINCONF_ENTRIES 7 +/* Output enable */ +#define OE (1 << 27) +/* Pull Up */ +#define PU (1 << 26) +/* Open Drain */ +#define OD (1 << 25) + +/* User-frendly defines for Pin Direction */ + /* oe = 0, pu = 0, od = 0 */ +#define IN (0) + /* oe = 0, pu = 1, od = 0 */ +#define IN_PU (PU) + /* oe = 1, pu = 0, od = 0 */ +#define OUT (OE) + /* oe = 1, pu = 1, od = 0 */ +#define OUT_PU (OE | PU) + /* oe = 1, pu = 0, od = 1 */ +#define BIDIR (OE | OD) + /* oe = 1, pu = 1, od = 1 */ +#define BIDIR_PU (OE | PU | OD) + +struct sti_pinctrl_platdata { + struct regmap *regmap; +}; + +struct sti_pin_desc { + unsigned char bank; + unsigned char pin; + unsigned char alt; + int dir; +}; + +/* + * PIO alternative Function selector + */ +void sti_alternate_select(struct udevice *dev, struct sti_pin_desc *pin_desc) +{ + struct sti_pinctrl_platdata *plat = dev_get_platdata(dev); + unsigned long sysconf, *sysconfreg; + int alt = pin_desc->alt; + int bank = pin_desc->bank; + int pin = pin_desc->pin; + + sysconfreg = (unsigned long *)plat->regmap->base; + + switch (bank) { + case 0 ... 5: /* in "SBC Bank" */ + sysconfreg += bank; + break; + case 10 ... 20: /* in "FRONT Bank" */ + sysconfreg += bank - 10; + break; + case 30 ... 35: /* in "REAR Bank" */ + sysconfreg += bank - 30; + break; + case 40 ... 42: /* in "FLASH Bank" */ + sysconfreg += bank - 40; + break; + default: + BUG(); + return; + } + + sysconf = readl(sysconfreg); + bitfield_replace(sysconf, pin * 4, 3, alt); + writel(sysconf, sysconfreg); +} + +/* pin configuration */ +void sti_pin_configure(struct udevice *dev, struct sti_pin_desc *pin_desc) +{ + struct sti_pinctrl_platdata *plat = dev_get_platdata(dev); + int bit; + int oe = 0, pu = 0, od = 0; + unsigned long *sysconfreg; + int bank = pin_desc->bank; + + sysconfreg = (unsigned long *)plat->regmap->base + 40; + + /* + * NOTE: The PIO configuration for the PIO pins in the + * "FLASH Bank" are different from all the other banks! + * Specifically, the output-enable pin control register + * (SYS_CFG_3040) and the pull-up pin control register + * (SYS_CFG_3050), are both classed as being "reserved". + * Hence, we do not write to these registers to configure + * the OE and PU features for PIOs in this bank. However, + * the open-drain pin control register (SYS_CFG_3060) + * follows the style of the other banks, and so we can + * treat that register normally. + * + * Being pedantic, we should configure the PU and PD features + * in the "FLASH Bank" explicitly instead using the four + * SYS_CFG registers: 3080, 3081, 3085, and 3086. However, this + * would necessitate passing in the alternate function number + * to this function, and adding some horrible complexity here. + * Alternatively, we could just perform 4 32-bit "pokes" to + * these four SYS_CFG registers early in the initialization. + * In practice, these four SYS_CFG registers are correct + * after a reset, and U-Boot does not need to change them, so + * we (cheat and) rely on these registers being correct. + * WARNING: Please be aware of this (pragmatic) behaviour! + */ + int flashss = 0; /* bool: PIO in the Flash Sub-System ? */ + + switch (pin_desc->dir) { + case IN: + oe = 0; pu = 0; od = 0; + break; + case IN_PU: + oe = 0; pu = 1; od = 0; + break; + case OUT: + oe = 1; pu = 0; od = 0; + break; + case BIDIR: + oe = 1; pu = 0; od = 1; + break; + case BIDIR_PU: + oe = 1; pu = 1; od = 1; + break; + + default: + error("%s invalid direction value: 0x%x\n", + __func__, pin_desc->dir); + BUG(); + break; + } + + switch (bank) { + case 0 ... 5: /* in "SBC Bank" */ + sysconfreg += bank / 4; + break; + case 10 ... 20: /* in "FRONT Bank" */ + bank -= 10; + sysconfreg += bank / 4; + break; + case 30 ... 35: /* in "REAR Bank" */ + bank -= 30; + sysconfreg += bank / 4; + break; + case 40 ... 42: /* in "FLASH Bank" */ + bank -= 40; + sysconfreg += bank / 4; + flashss = 1; /* pin is in the Flash Sub-System */ + break; + default: + BUG(); + return; + } + + bit = ((bank * 8) + pin_desc->pin) % 32; + + /* + * set the "Output Enable" pin control + * but, do nothing if in the flashSS + */ + if (!flashss) { + if (oe) + generic_set_bit(bit, sysconfreg); + else + generic_clear_bit(bit, sysconfreg); + } + + sysconfreg += 10; /* skip to next set of syscfg registers */ + + /* + * set the "Pull Up" pin control + * but, do nothing if in the FlashSS + */ + + if (!flashss) { + if (pu) + generic_set_bit(bit, sysconfreg); + else + generic_clear_bit(bit, sysconfreg); + } + + sysconfreg += 10; /* skip to next set of syscfg registers */ + + /* set the "Open Drain Enable" pin control */ + if (od) + generic_set_bit(bit, sysconfreg); + else + generic_clear_bit(bit, sysconfreg); +} + + +static int sti_pinctrl_set_state(struct udevice *dev, struct udevice *config) +{ + struct fdtdec_phandle_args args; + const void *blob = gd->fdt_blob; + const char *prop_name; + int node = dev_of_offset(config); + int property_offset, prop_len; + int pinconf_node, ret, count; + const char *bank_name; + u32 cells[MAX_STI_PINCONF_ENTRIES]; + + struct sti_pin_desc pin_desc; + + /* go to next node "st,pins" which contains the pins configuration */ + pinconf_node = fdt_subnode_offset(blob, node, "st,pins"); + + /* + * parse each pins configuration which looks like : + * pin_name = <bank_phandle pin_nb alt dir rt_type rt_delay rt_clk> + */ + + fdt_for_each_property_offset(property_offset, blob, pinconf_node) { + fdt_getprop_by_offset(blob, property_offset, &prop_name, + &prop_len); + + /* extract the bank of the pin description */ + ret = fdtdec_parse_phandle_with_args(blob, pinconf_node, + prop_name, "#gpio-cells", + 0, 0, &args); + if (ret < 0) { + error("Can't get the gpio bank phandle: %d\n", ret); + return ret; + } + + bank_name = fdt_getprop(blob, args.node, "st,bank-name", + &count); + if (count < 0) { + error("Can't find bank-name property %d\n", count); + return -EINVAL; + } + + pin_desc.bank = trailing_strtoln(bank_name, NULL); + + count = fdtdec_get_int_array_count(blob, pinconf_node, + prop_name, cells, + ARRAY_SIZE(cells)); + if (count < 0) { + error("Bad pin configuration array %d\n", count); + return -EINVAL; + } + + if (count > MAX_STI_PINCONF_ENTRIES) { + error("Unsupported pinconf array count %d\n", count); + return -EINVAL; + } + + pin_desc.pin = cells[1]; + pin_desc.alt = cells[2]; + pin_desc.dir = cells[3]; + + sti_alternate_select(dev, &pin_desc); + sti_pin_configure(dev, &pin_desc); + }; + + return 0; +} + +static int sti_pinctrl_probe(struct udevice *dev) +{ + struct sti_pinctrl_platdata *plat = dev_get_platdata(dev); + struct udevice *syscon; + int err; + + /* get corresponding syscon phandle */ + err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, + "st,syscfg", &syscon); + if (err) { + error("unable to find syscon device\n"); + return err; + } + + plat->regmap = syscon_get_regmap(syscon); + if (!plat->regmap) { + error("unable to find regmap\n"); + return -ENODEV; + } + + return 0; +} + +static const struct udevice_id sti_pinctrl_ids[] = { + { .compatible = "st,stih407-sbc-pinctrl" }, + { .compatible = "st,stih407-front-pinctrl" }, + { .compatible = "st,stih407-rear-pinctrl" }, + { .compatible = "st,stih407-flash-pinctrl" }, + { } +}; + +const struct pinctrl_ops sti_pinctrl_ops = { + .set_state = sti_pinctrl_set_state, +}; + +U_BOOT_DRIVER(pinctrl_sti) = { + .name = "pinctrl_sti", + .id = UCLASS_PINCTRL, + .of_match = sti_pinctrl_ids, + .ops = &sti_pinctrl_ops, + .probe = sti_pinctrl_probe, + .platdata_auto_alloc_size = sizeof(struct sti_pinctrl_platdata), + .ops = &sti_pinctrl_ops, +};