// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2017-2020 STMicroelectronics - All Rights Reserved */ #define LOG_CATEGORY UCLASS_PINCTRL #include #include #include #include #include #include #include #include #include #include #include #include #include #include "../gpio/stm32_gpio_priv.h" #define MAX_PINS_ONE_IP 70 #define MODE_BITS_MASK 3 #define OSPEED_MASK 3 #define PUPD_MASK 3 #define OTYPE_MSK 1 #define AFR_MASK 0xF struct stm32_pinctrl_priv { struct hwspinlock hws; int pinctrl_ngpios; struct list_head gpio_dev; }; struct stm32_gpio_bank { struct udevice *gpio_dev; struct list_head list; }; #ifndef CONFIG_SPL_BUILD static char pin_name[PINNAME_SIZE]; static const char * const pinmux_mode[GPIOF_COUNT] = { [GPIOF_INPUT] = "gpio input", [GPIOF_OUTPUT] = "gpio output", [GPIOF_UNUSED] = "analog", [GPIOF_UNKNOWN] = "unknown", [GPIOF_FUNC] = "alt function", }; static const char * const pinmux_bias[] = { [STM32_GPIO_PUPD_NO] = "", [STM32_GPIO_PUPD_UP] = "pull-up", [STM32_GPIO_PUPD_DOWN] = "pull-down", }; static const char * const pinmux_otype[] = { [STM32_GPIO_OTYPE_PP] = "push-pull", [STM32_GPIO_OTYPE_OD] = "open-drain", }; static int stm32_pinctrl_get_af(struct udevice *dev, unsigned int offset) { struct stm32_gpio_priv *priv = dev_get_priv(dev); struct stm32_gpio_regs *regs = priv->regs; u32 af; u32 alt_shift = (offset % 8) * 4; u32 alt_index = offset / 8; af = (readl(®s->afr[alt_index]) & GENMASK(alt_shift + 3, alt_shift)) >> alt_shift; return af; } static int stm32_populate_gpio_dev_list(struct udevice *dev) { struct stm32_pinctrl_priv *priv = dev_get_priv(dev); struct udevice *gpio_dev; struct udevice *child; struct stm32_gpio_bank *gpio_bank; int ret; /* * parse pin-controller sub-nodes (ie gpio bank nodes) and fill * a list with all gpio device reference which belongs to the * current pin-controller. This list is used to find pin_name and * pin muxing */ list_for_each_entry(child, &dev->child_head, sibling_node) { ret = uclass_get_device_by_name(UCLASS_GPIO, child->name, &gpio_dev); if (ret < 0) continue; gpio_bank = malloc(sizeof(*gpio_bank)); if (!gpio_bank) { dev_err(dev, "Not enough memory\n"); return -ENOMEM; } gpio_bank->gpio_dev = gpio_dev; list_add_tail(&gpio_bank->list, &priv->gpio_dev); } return 0; } static int stm32_pinctrl_get_pins_count(struct udevice *dev) { struct stm32_pinctrl_priv *priv = dev_get_priv(dev); struct gpio_dev_priv *uc_priv; struct stm32_gpio_bank *gpio_bank; /* * if get_pins_count has already been executed once on this * pin-controller, no need to run it again */ if (priv->pinctrl_ngpios) return priv->pinctrl_ngpios; if (list_empty(&priv->gpio_dev)) stm32_populate_gpio_dev_list(dev); /* * walk through all banks to retrieve the pin-controller * pins number */ list_for_each_entry(gpio_bank, &priv->gpio_dev, list) { uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev); priv->pinctrl_ngpios += uc_priv->gpio_count; } return priv->pinctrl_ngpios; } static struct udevice *stm32_pinctrl_get_gpio_dev(struct udevice *dev, unsigned int selector, unsigned int *idx) { struct stm32_pinctrl_priv *priv = dev_get_priv(dev); struct stm32_gpio_bank *gpio_bank; struct gpio_dev_priv *uc_priv; int pin_count = 0; if (list_empty(&priv->gpio_dev)) stm32_populate_gpio_dev_list(dev); /* look up for the bank which owns the requested pin */ list_for_each_entry(gpio_bank, &priv->gpio_dev, list) { uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev); if (selector < (pin_count + uc_priv->gpio_count)) { /* * we found the bank, convert pin selector to * gpio bank index */ *idx = selector - pin_count; return gpio_bank->gpio_dev; } pin_count += uc_priv->gpio_count; } return NULL; } static const char *stm32_pinctrl_get_pin_name(struct udevice *dev, unsigned int selector) { struct gpio_dev_priv *uc_priv; struct udevice *gpio_dev; unsigned int gpio_idx; /* look up for the bank which owns the requested pin */ gpio_dev = stm32_pinctrl_get_gpio_dev(dev, selector, &gpio_idx); if (!gpio_dev) { snprintf(pin_name, PINNAME_SIZE, "Error"); } else { uc_priv = dev_get_uclass_priv(gpio_dev); snprintf(pin_name, PINNAME_SIZE, "%s%d", uc_priv->bank_name, gpio_idx); } return pin_name; } static int stm32_pinctrl_get_pin_muxing(struct udevice *dev, unsigned int selector, char *buf, int size) { struct udevice *gpio_dev; struct stm32_gpio_priv *priv; const char *label; int mode; int af_num; unsigned int gpio_idx; u32 pupd, otype; /* look up for the bank which owns the requested pin */ gpio_dev = stm32_pinctrl_get_gpio_dev(dev, selector, &gpio_idx); if (!gpio_dev) return -ENODEV; mode = gpio_get_raw_function(gpio_dev, gpio_idx, &label); dev_dbg(dev, "selector = %d gpio_idx = %d mode = %d\n", selector, gpio_idx, mode); priv = dev_get_priv(gpio_dev); pupd = (readl(&priv->regs->pupdr) >> (gpio_idx * 2)) & PUPD_MASK; otype = (readl(&priv->regs->otyper) >> gpio_idx) & OTYPE_MSK; switch (mode) { case GPIOF_UNKNOWN: case GPIOF_UNUSED: snprintf(buf, size, "%s", pinmux_mode[mode]); break; case GPIOF_FUNC: af_num = stm32_pinctrl_get_af(gpio_dev, gpio_idx); snprintf(buf, size, "%s %d %s %s", pinmux_mode[mode], af_num, pinmux_otype[otype], pinmux_bias[pupd]); break; case GPIOF_OUTPUT: snprintf(buf, size, "%s %s %s %s", pinmux_mode[mode], pinmux_otype[otype], pinmux_bias[pupd], label ? label : ""); break; case GPIOF_INPUT: snprintf(buf, size, "%s %s %s", pinmux_mode[mode], pinmux_bias[pupd], label ? label : ""); break; } return 0; } #endif static int stm32_pinctrl_probe(struct udevice *dev) { struct stm32_pinctrl_priv *priv = dev_get_priv(dev); int ret; INIT_LIST_HEAD(&priv->gpio_dev); /* hwspinlock property is optional, just log the error */ ret = hwspinlock_get_by_index(dev, 0, &priv->hws); if (ret) dev_dbg(dev, "hwspinlock_get_by_index may have failed (%d)\n", ret); return 0; } static int stm32_gpio_config(struct gpio_desc *desc, const struct stm32_gpio_ctl *ctl) { struct stm32_gpio_priv *priv = dev_get_priv(desc->dev); struct stm32_gpio_regs *regs = priv->regs; struct stm32_pinctrl_priv *ctrl_priv; int ret; u32 index; if (!ctl || ctl->af > 15 || ctl->mode > 3 || ctl->otype > 1 || ctl->pupd > 2 || ctl->speed > 3) return -EINVAL; ctrl_priv = dev_get_priv(dev_get_parent(desc->dev)); ret = hwspinlock_lock_timeout(&ctrl_priv->hws, 10); if (ret == -ETIME) { dev_err(desc->dev, "HWSpinlock timeout\n"); return ret; } index = (desc->offset & 0x07) * 4; clrsetbits_le32(®s->afr[desc->offset >> 3], AFR_MASK << index, ctl->af << index); index = desc->offset * 2; clrsetbits_le32(®s->moder, MODE_BITS_MASK << index, ctl->mode << index); clrsetbits_le32(®s->ospeedr, OSPEED_MASK << index, ctl->speed << index); clrsetbits_le32(®s->pupdr, PUPD_MASK << index, ctl->pupd << index); index = desc->offset; clrsetbits_le32(®s->otyper, OTYPE_MSK << index, ctl->otype << index); hwspinlock_unlock(&ctrl_priv->hws); return 0; } static int prep_gpio_dsc(struct stm32_gpio_dsc *gpio_dsc, u32 port_pin) { gpio_dsc->port = (port_pin & 0x1F000) >> 12; gpio_dsc->pin = (port_pin & 0x0F00) >> 8; log_debug("GPIO:port= %d, pin= %d\n", gpio_dsc->port, gpio_dsc->pin); return 0; } static int prep_gpio_ctl(struct stm32_gpio_ctl *gpio_ctl, u32 gpio_fn, ofnode node) { gpio_fn &= 0x00FF; gpio_ctl->af = 0; switch (gpio_fn) { case 0: gpio_ctl->mode = STM32_GPIO_MODE_IN; break; case 1 ... 16: gpio_ctl->mode = STM32_GPIO_MODE_AF; gpio_ctl->af = gpio_fn - 1; break; case 17: gpio_ctl->mode = STM32_GPIO_MODE_AN; break; default: gpio_ctl->mode = STM32_GPIO_MODE_OUT; break; } gpio_ctl->speed = ofnode_read_u32_default(node, "slew-rate", 0); if (ofnode_read_bool(node, "drive-open-drain")) gpio_ctl->otype = STM32_GPIO_OTYPE_OD; else gpio_ctl->otype = STM32_GPIO_OTYPE_PP; if (ofnode_read_bool(node, "bias-pull-up")) gpio_ctl->pupd = STM32_GPIO_PUPD_UP; else if (ofnode_read_bool(node, "bias-pull-down")) gpio_ctl->pupd = STM32_GPIO_PUPD_DOWN; else gpio_ctl->pupd = STM32_GPIO_PUPD_NO; log_debug("gpio fn= %d, slew-rate= %x, op type= %x, pull-upd is = %x\n", gpio_fn, gpio_ctl->speed, gpio_ctl->otype, gpio_ctl->pupd); return 0; } static int stm32_pinctrl_config(ofnode node) { u32 pin_mux[MAX_PINS_ONE_IP]; int rv, len; ofnode subnode; /* * check for "pinmux" property in each subnode (e.g. pins1 and pins2 for * usart1) of pin controller phandle "pinctrl-0" * */ ofnode_for_each_subnode(subnode, node) { struct stm32_gpio_dsc gpio_dsc; struct stm32_gpio_ctl gpio_ctl; int i; rv = ofnode_read_size(subnode, "pinmux"); if (rv < 0) return rv; len = rv / sizeof(pin_mux[0]); log_debug("No of pinmux entries= %d\n", len); if (len > MAX_PINS_ONE_IP) return -EINVAL; rv = ofnode_read_u32_array(subnode, "pinmux", pin_mux, len); if (rv < 0) return rv; for (i = 0; i < len; i++) { struct gpio_desc desc; log_debug("pinmux = %x\n", *(pin_mux + i)); prep_gpio_dsc(&gpio_dsc, *(pin_mux + i)); prep_gpio_ctl(&gpio_ctl, *(pin_mux + i), subnode); rv = uclass_get_device_by_seq(UCLASS_GPIO, gpio_dsc.port, &desc.dev); if (rv) return rv; desc.offset = gpio_dsc.pin; rv = stm32_gpio_config(&desc, &gpio_ctl); log_debug("rv = %d\n\n", rv); if (rv) return rv; } } return 0; } static int stm32_pinctrl_bind(struct udevice *dev) { ofnode node; const char *name; int ret; dev_for_each_subnode(node, dev) { dev_dbg(dev, "bind %s\n", ofnode_get_name(node)); if (!ofnode_is_enabled(node)) continue; ofnode_get_property(node, "gpio-controller", &ret); if (ret < 0) continue; /* Get the name of each gpio node */ name = ofnode_get_name(node); if (!name) return -EINVAL; /* Bind each gpio node */ ret = device_bind_driver_to_node(dev, "gpio_stm32", name, node, NULL); if (ret) return ret; dev_dbg(dev, "bind %s\n", name); } return 0; } #if CONFIG_IS_ENABLED(PINCTRL_FULL) static int stm32_pinctrl_set_state(struct udevice *dev, struct udevice *config) { return stm32_pinctrl_config(dev_ofnode(config)); } #else /* PINCTRL_FULL */ static int stm32_pinctrl_set_state_simple(struct udevice *dev, struct udevice *periph) { const fdt32_t *list; uint32_t phandle; ofnode config_node; int size, i, ret; list = ofnode_get_property(dev_ofnode(periph), "pinctrl-0", &size); if (!list) return -EINVAL; dev_dbg(dev, "periph->name = %s\n", periph->name); size /= sizeof(*list); for (i = 0; i < size; i++) { phandle = fdt32_to_cpu(*list++); config_node = ofnode_get_by_phandle(phandle); if (!ofnode_valid(config_node)) { dev_err(periph, "prop pinctrl-0 index %d invalid phandle\n", i); return -EINVAL; } ret = stm32_pinctrl_config(config_node); if (ret) return ret; } return 0; } #endif /* PINCTRL_FULL */ static struct pinctrl_ops stm32_pinctrl_ops = { #if CONFIG_IS_ENABLED(PINCTRL_FULL) .set_state = stm32_pinctrl_set_state, #else /* PINCTRL_FULL */ .set_state_simple = stm32_pinctrl_set_state_simple, #endif /* PINCTRL_FULL */ #ifndef CONFIG_SPL_BUILD .get_pin_name = stm32_pinctrl_get_pin_name, .get_pins_count = stm32_pinctrl_get_pins_count, .get_pin_muxing = stm32_pinctrl_get_pin_muxing, #endif }; static const struct udevice_id stm32_pinctrl_ids[] = { { .compatible = "st,stm32f429-pinctrl" }, { .compatible = "st,stm32f469-pinctrl" }, { .compatible = "st,stm32f746-pinctrl" }, { .compatible = "st,stm32f769-pinctrl" }, { .compatible = "st,stm32h743-pinctrl" }, { .compatible = "st,stm32mp157-pinctrl" }, { .compatible = "st,stm32mp157-z-pinctrl" }, { } }; U_BOOT_DRIVER(pinctrl_stm32) = { .name = "pinctrl_stm32", .id = UCLASS_PINCTRL, .of_match = stm32_pinctrl_ids, .ops = &stm32_pinctrl_ops, .bind = stm32_pinctrl_bind, .probe = stm32_pinctrl_probe, .priv_auto = sizeof(struct stm32_pinctrl_priv), };