/* * Xilinx Zynq GPIO device driver * * Copyright (C) 2015 DAVE Embedded Systems * * Most of code taken from linux kernel driver (linux/drivers/gpio/gpio-zynq.c) * Copyright (C) 2009 - 2014 Xilinx, Inc. * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include #include #include DECLARE_GLOBAL_DATA_PTR; /* Maximum banks */ #define ZYNQ_GPIO_MAX_BANK 4 #define ZYNQ_GPIO_BANK0_NGPIO 32 #define ZYNQ_GPIO_BANK1_NGPIO 22 #define ZYNQ_GPIO_BANK2_NGPIO 32 #define ZYNQ_GPIO_BANK3_NGPIO 32 #define ZYNQ_GPIO_NR_GPIOS (ZYNQ_GPIO_BANK0_NGPIO + \ ZYNQ_GPIO_BANK1_NGPIO + \ ZYNQ_GPIO_BANK2_NGPIO + \ ZYNQ_GPIO_BANK3_NGPIO) #define ZYNQMP_GPIO_MAX_BANK 6 #define ZYNQMP_GPIO_BANK0_NGPIO 26 #define ZYNQMP_GPIO_BANK1_NGPIO 26 #define ZYNQMP_GPIO_BANK2_NGPIO 26 #define ZYNQMP_GPIO_BANK3_NGPIO 32 #define ZYNQMP_GPIO_BANK4_NGPIO 32 #define ZYNQMP_GPIO_BANK5_NGPIO 32 #define ZYNQMP_GPIO_NR_GPIOS 174 #define ZYNQ_GPIO_BANK0_PIN_MIN(str) 0 #define ZYNQ_GPIO_BANK0_PIN_MAX(str) (ZYNQ_GPIO_BANK0_PIN_MIN(str) + \ ZYNQ##str##_GPIO_BANK0_NGPIO - 1) #define ZYNQ_GPIO_BANK1_PIN_MIN(str) (ZYNQ_GPIO_BANK0_PIN_MAX(str) + 1) #define ZYNQ_GPIO_BANK1_PIN_MAX(str) (ZYNQ_GPIO_BANK1_PIN_MIN(str) + \ ZYNQ##str##_GPIO_BANK1_NGPIO - 1) #define ZYNQ_GPIO_BANK2_PIN_MIN(str) (ZYNQ_GPIO_BANK1_PIN_MAX(str) + 1) #define ZYNQ_GPIO_BANK2_PIN_MAX(str) (ZYNQ_GPIO_BANK2_PIN_MIN(str) + \ ZYNQ##str##_GPIO_BANK2_NGPIO - 1) #define ZYNQ_GPIO_BANK3_PIN_MIN(str) (ZYNQ_GPIO_BANK2_PIN_MAX(str) + 1) #define ZYNQ_GPIO_BANK3_PIN_MAX(str) (ZYNQ_GPIO_BANK3_PIN_MIN(str) + \ ZYNQ##str##_GPIO_BANK3_NGPIO - 1) #define ZYNQ_GPIO_BANK4_PIN_MIN(str) (ZYNQ_GPIO_BANK3_PIN_MAX(str) + 1) #define ZYNQ_GPIO_BANK4_PIN_MAX(str) (ZYNQ_GPIO_BANK4_PIN_MIN(str) + \ ZYNQ##str##_GPIO_BANK4_NGPIO - 1) #define ZYNQ_GPIO_BANK5_PIN_MIN(str) (ZYNQ_GPIO_BANK4_PIN_MAX(str) + 1) #define ZYNQ_GPIO_BANK5_PIN_MAX(str) (ZYNQ_GPIO_BANK5_PIN_MIN(str) + \ ZYNQ##str##_GPIO_BANK5_NGPIO - 1) /* Register offsets for the GPIO device */ /* LSW Mask & Data -WO */ #define ZYNQ_GPIO_DATA_LSW_OFFSET(BANK) (0x000 + (8 * BANK)) /* MSW Mask & Data -WO */ #define ZYNQ_GPIO_DATA_MSW_OFFSET(BANK) (0x004 + (8 * BANK)) /* Data Register-RW */ #define ZYNQ_GPIO_DATA_RO_OFFSET(BANK) (0x060 + (4 * BANK)) /* Direction mode reg-RW */ #define ZYNQ_GPIO_DIRM_OFFSET(BANK) (0x204 + (0x40 * BANK)) /* Output enable reg-RW */ #define ZYNQ_GPIO_OUTEN_OFFSET(BANK) (0x208 + (0x40 * BANK)) /* Interrupt mask reg-RO */ #define ZYNQ_GPIO_INTMASK_OFFSET(BANK) (0x20C + (0x40 * BANK)) /* Interrupt enable reg-WO */ #define ZYNQ_GPIO_INTEN_OFFSET(BANK) (0x210 + (0x40 * BANK)) /* Interrupt disable reg-WO */ #define ZYNQ_GPIO_INTDIS_OFFSET(BANK) (0x214 + (0x40 * BANK)) /* Interrupt status reg-RO */ #define ZYNQ_GPIO_INTSTS_OFFSET(BANK) (0x218 + (0x40 * BANK)) /* Interrupt type reg-RW */ #define ZYNQ_GPIO_INTTYPE_OFFSET(BANK) (0x21C + (0x40 * BANK)) /* Interrupt polarity reg-RW */ #define ZYNQ_GPIO_INTPOL_OFFSET(BANK) (0x220 + (0x40 * BANK)) /* Interrupt on any, reg-RW */ #define ZYNQ_GPIO_INTANY_OFFSET(BANK) (0x224 + (0x40 * BANK)) /* Disable all interrupts mask */ #define ZYNQ_GPIO_IXR_DISABLE_ALL 0xFFFFFFFF /* Mid pin number of a bank */ #define ZYNQ_GPIO_MID_PIN_NUM 16 /* GPIO upper 16 bit mask */ #define ZYNQ_GPIO_UPPER_MASK 0xFFFF0000 struct zynq_gpio_privdata { phys_addr_t base; const struct zynq_platform_data *p_data; }; /** * struct zynq_platform_data - zynq gpio platform data structure * @label: string to store in gpio->label * @ngpio: max number of gpio pins * @max_bank: maximum number of gpio banks * @bank_min: this array represents bank's min pin * @bank_max: this array represents bank's max pin */ struct zynq_platform_data { const char *label; u16 ngpio; int max_bank; int bank_min[ZYNQMP_GPIO_MAX_BANK]; int bank_max[ZYNQMP_GPIO_MAX_BANK]; }; static const struct zynq_platform_data zynqmp_gpio_def = { .label = "zynqmp_gpio", .ngpio = ZYNQMP_GPIO_NR_GPIOS, .max_bank = ZYNQMP_GPIO_MAX_BANK, .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(MP), .bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(MP), .bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(MP), .bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(MP), .bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(MP), .bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(MP), .bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(MP), .bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(MP), .bank_min[4] = ZYNQ_GPIO_BANK4_PIN_MIN(MP), .bank_max[4] = ZYNQ_GPIO_BANK4_PIN_MAX(MP), .bank_min[5] = ZYNQ_GPIO_BANK5_PIN_MIN(MP), .bank_max[5] = ZYNQ_GPIO_BANK5_PIN_MAX(MP), }; static const struct zynq_platform_data zynq_gpio_def = { .label = "zynq_gpio", .ngpio = ZYNQ_GPIO_NR_GPIOS, .max_bank = ZYNQ_GPIO_MAX_BANK, .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(), .bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(), .bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(), .bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(), .bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(), .bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(), .bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(), .bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(), }; /** * zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank * for a given pin in the GPIO device * @pin_num: gpio pin number within the device * @bank_num: an output parameter used to return the bank number of the gpio * pin * @bank_pin_num: an output parameter used to return pin number within a bank * for the given gpio pin * * Returns the bank number and pin offset within the bank. */ static inline void zynq_gpio_get_bank_pin(unsigned int pin_num, unsigned int *bank_num, unsigned int *bank_pin_num, struct udevice *dev) { struct zynq_gpio_privdata *priv = dev_get_priv(dev); int bank; for (bank = 0; bank < priv->p_data->max_bank; bank++) { if ((pin_num >= priv->p_data->bank_min[bank]) && (pin_num <= priv->p_data->bank_max[bank])) { *bank_num = bank; *bank_pin_num = pin_num - priv->p_data->bank_min[bank]; return; } } if (bank >= priv->p_data->max_bank) { printf("Inavlid bank and pin num\n"); *bank_num = 0; *bank_pin_num = 0; } } static int gpio_is_valid(unsigned gpio, struct udevice *dev) { struct zynq_gpio_privdata *priv = dev_get_priv(dev); return (gpio >= 0) && (gpio < priv->p_data->ngpio); } static int check_gpio(unsigned gpio, struct udevice *dev) { if (!gpio_is_valid(gpio, dev)) { printf("ERROR : check_gpio: invalid GPIO %d\n", gpio); return -1; } return 0; } static int zynq_gpio_get_value(struct udevice *dev, unsigned gpio) { u32 data; unsigned int bank_num, bank_pin_num; struct zynq_gpio_privdata *priv = dev_get_priv(dev); if (check_gpio(gpio, dev) < 0) return -1; zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev); data = readl(priv->base + ZYNQ_GPIO_DATA_RO_OFFSET(bank_num)); return (data >> bank_pin_num) & 1; } static int zynq_gpio_set_value(struct udevice *dev, unsigned gpio, int value) { unsigned int reg_offset, bank_num, bank_pin_num; struct zynq_gpio_privdata *priv = dev_get_priv(dev); if (check_gpio(gpio, dev) < 0) return -1; zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev); if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) { /* only 16 data bits in bit maskable reg */ bank_pin_num -= ZYNQ_GPIO_MID_PIN_NUM; reg_offset = ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num); } else { reg_offset = ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num); } /* * get the 32 bit value to be written to the mask/data register where * the upper 16 bits is the mask and lower 16 bits is the data */ value = !!value; value = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) & ((value << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK); writel(value, priv->base + reg_offset); return 0; } static int zynq_gpio_direction_input(struct udevice *dev, unsigned gpio) { u32 reg; unsigned int bank_num, bank_pin_num; struct zynq_gpio_privdata *priv = dev_get_priv(dev); if (check_gpio(gpio, dev) < 0) return -1; zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev); /* bank 0 pins 7 and 8 are special and cannot be used as inputs */ if (bank_num == 0 && (bank_pin_num == 7 || bank_pin_num == 8)) return -1; /* clear the bit in direction mode reg to set the pin as input */ reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num)); reg &= ~BIT(bank_pin_num); writel(reg, priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num)); return 0; } static int zynq_gpio_direction_output(struct udevice *dev, unsigned gpio, int value) { u32 reg; unsigned int bank_num, bank_pin_num; struct zynq_gpio_privdata *priv = dev_get_priv(dev); if (check_gpio(gpio, dev) < 0) return -1; zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev); /* set the GPIO pin as output */ reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num)); reg |= BIT(bank_pin_num); writel(reg, priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num)); /* configure the output enable reg for the pin */ reg = readl(priv->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num)); reg |= BIT(bank_pin_num); writel(reg, priv->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num)); /* set the state of the pin */ gpio_set_value(gpio, value); return 0; } static const struct dm_gpio_ops gpio_zynq_ops = { .direction_input = zynq_gpio_direction_input, .direction_output = zynq_gpio_direction_output, .get_value = zynq_gpio_get_value, .set_value = zynq_gpio_set_value, }; static const struct udevice_id zynq_gpio_ids[] = { { .compatible = "xlnx,zynq-gpio-1.0", .data = (ulong)&zynq_gpio_def}, { .compatible = "xlnx,zynqmp-gpio-1.0", .data = (ulong)&zynqmp_gpio_def}, { } }; static void zynq_gpio_getplat_data(struct udevice *dev) { const struct udevice_id *of_match = zynq_gpio_ids; int ret; struct zynq_gpio_privdata *priv = dev_get_priv(dev); while (of_match->compatible) { ret = fdt_node_offset_by_compatible(gd->fdt_blob, -1, of_match->compatible); if (ret >= 0) { priv->p_data = (struct zynq_platform_data *)of_match->data; break; } else { of_match++; continue; } } if (!priv->p_data) printf("No Platform data found\n"); } static int zynq_gpio_probe(struct udevice *dev) { struct zynq_gpio_privdata *priv = dev_get_priv(dev); struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); zynq_gpio_getplat_data(dev); if (priv->p_data) uc_priv->gpio_count = priv->p_data->ngpio; return 0; } static int zynq_gpio_ofdata_to_platdata(struct udevice *dev) { struct zynq_gpio_privdata *priv = dev_get_priv(dev); priv->base = dev_get_addr(dev); return 0; } U_BOOT_DRIVER(gpio_zynq) = { .name = "gpio_zynq", .id = UCLASS_GPIO, .ops = &gpio_zynq_ops, .of_match = zynq_gpio_ids, .ofdata_to_platdata = zynq_gpio_ofdata_to_platdata, .probe = zynq_gpio_probe, .priv_auto_alloc_size = sizeof(struct zynq_gpio_privdata), };