// SPDX-License-Identifier: GPL-2.0+ /* * Atmel PIO pinctrl driver * * Copyright (C) 2016 Atmel Corporation * Wenyou.Yang */ #include #include #include #include #include #include #include DECLARE_GLOBAL_DATA_PTR; #define MAX_GPIO_BANKS 5 #define MAX_NB_GPIO_PER_BANK 32 #define MAX_PINMUX_ENTRIES 200 struct at91_pinctrl_priv { struct at91_port *reg_base[MAX_GPIO_BANKS]; u32 nbanks; }; #define PULL_UP BIT(0) #define MULTI_DRIVE BIT(1) #define DEGLITCH BIT(2) #define PULL_DOWN BIT(3) #define DIS_SCHMIT BIT(4) #define DRIVE_STRENGTH_SHIFT 5 #define DRIVE_STRENGTH_MASK 0x3 #define DRIVE_STRENGTH (DRIVE_STRENGTH_MASK << DRIVE_STRENGTH_SHIFT) #define OUTPUT BIT(7) #define OUTPUT_VAL_SHIFT 8 #define OUTPUT_VAL (0x1 << OUTPUT_VAL_SHIFT) #define DEBOUNCE BIT(16) #define DEBOUNCE_VAL_SHIFT 17 #define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT) /** * These defines will translated the dt binding settings to our internal * settings. They are not necessarily the same value as the register setting. * The actual drive strength current of low, medium and high must be looked up * from the corresponding device datasheet. This value is different for pins * that are even in the same banks. It is also dependent on VCC. * DRIVE_STRENGTH_DEFAULT is just a placeholder to avoid changing the drive * strength when there is no dt config for it. */ #define DRIVE_STRENGTH_DEFAULT (0 << DRIVE_STRENGTH_SHIFT) #define DRIVE_STRENGTH_LOW (1 << DRIVE_STRENGTH_SHIFT) #define DRIVE_STRENGTH_MED (2 << DRIVE_STRENGTH_SHIFT) #define DRIVE_STRENGTH_HI (3 << DRIVE_STRENGTH_SHIFT) enum at91_mux { AT91_MUX_GPIO = 0, AT91_MUX_PERIPH_A = 1, AT91_MUX_PERIPH_B = 2, AT91_MUX_PERIPH_C = 3, AT91_MUX_PERIPH_D = 4, }; /** * struct at91_pinctrl_mux_ops - describes an AT91 mux ops group * on new IP with support for periph C and D the way to mux in * periph A and B has changed * So provide the right callbacks * if not present means the IP does not support it * @mux_A_periph: assign the corresponding pin to the peripheral A function. * @mux_B_periph: assign the corresponding pin to the peripheral B function. * @mux_C_periph: assign the corresponding pin to the peripheral C function. * @mux_D_periph: assign the corresponding pin to the peripheral D function. * @set_deglitch: enable/disable the deglitch feature. * @set_debounce: enable/disable the debounce feature. * @set_pulldown: enable/disable the pulldown feature. * @disable_schmitt_trig: disable schmitt trigger */ struct at91_pinctrl_mux_ops { void (*mux_A_periph)(struct at91_port *pio, u32 mask); void (*mux_B_periph)(struct at91_port *pio, u32 mask); void (*mux_C_periph)(struct at91_port *pio, u32 mask); void (*mux_D_periph)(struct at91_port *pio, u32 mask); void (*set_deglitch)(struct at91_port *pio, u32 mask, bool is_on); void (*set_debounce)(struct at91_port *pio, u32 mask, bool is_on, u32 div); void (*set_pulldown)(struct at91_port *pio, u32 mask, bool is_on); void (*disable_schmitt_trig)(struct at91_port *pio, u32 mask); void (*set_drivestrength)(struct at91_port *pio, u32 pin, u32 strength); }; static u32 two_bit_pin_value_shift_amount(u32 pin) { /* return the shift value for a pin for "two bit" per pin registers, * i.e. drive strength */ return 2 * ((pin >= MAX_NB_GPIO_PER_BANK/2) ? pin - MAX_NB_GPIO_PER_BANK/2 : pin); } static void at91_mux_disable_interrupt(struct at91_port *pio, u32 mask) { writel(mask, &pio->idr); } static void at91_mux_set_pullup(struct at91_port *pio, u32 mask, bool on) { if (on) writel(mask, &pio->mux.pio3.ppddr); writel(mask, (on ? &pio->puer : &pio->pudr)); } static void at91_mux_set_output(struct at91_port *pio, unsigned mask, bool is_on, bool val) { writel(mask, (val ? &pio->sodr : &pio->codr)); writel(mask, (is_on ? &pio->oer : &pio->odr)); } static void at91_mux_set_multidrive(struct at91_port *pio, u32 mask, bool on) { writel(mask, (on ? &pio->mder : &pio->mddr)); } static void at91_mux_set_A_periph(struct at91_port *pio, u32 mask) { writel(mask, &pio->mux.pio2.asr); } static void at91_mux_set_B_periph(struct at91_port *pio, u32 mask) { writel(mask, &pio->mux.pio2.bsr); } static void at91_mux_pio3_set_A_periph(struct at91_port *pio, u32 mask) { writel(readl(&pio->mux.pio3.abcdsr1) & ~mask, &pio->mux.pio3.abcdsr1); writel(readl(&pio->mux.pio3.abcdsr2) & ~mask, &pio->mux.pio3.abcdsr2); } static void at91_mux_pio3_set_B_periph(struct at91_port *pio, u32 mask) { writel(readl(&pio->mux.pio3.abcdsr1) | mask, &pio->mux.pio3.abcdsr1); writel(readl(&pio->mux.pio3.abcdsr2) & ~mask, &pio->mux.pio3.abcdsr2); } static void at91_mux_pio3_set_C_periph(struct at91_port *pio, u32 mask) { writel(readl(&pio->mux.pio3.abcdsr1) & ~mask, &pio->mux.pio3.abcdsr1); writel(readl(&pio->mux.pio3.abcdsr2) | mask, &pio->mux.pio3.abcdsr2); } static void at91_mux_pio3_set_D_periph(struct at91_port *pio, u32 mask) { writel(readl(&pio->mux.pio3.abcdsr1) | mask, &pio->mux.pio3.abcdsr1); writel(readl(&pio->mux.pio3.abcdsr2) | mask, &pio->mux.pio3.abcdsr2); } static void at91_mux_set_deglitch(struct at91_port *pio, u32 mask, bool is_on) { writel(mask, (is_on ? &pio->ifer : &pio->ifdr)); } static void at91_mux_pio3_set_deglitch(struct at91_port *pio, u32 mask, bool is_on) { if (is_on) writel(mask, &pio->mux.pio3.ifscdr); at91_mux_set_deglitch(pio, mask, is_on); } static void at91_mux_pio3_set_debounce(struct at91_port *pio, u32 mask, bool is_on, u32 div) { if (is_on) { writel(mask, &pio->mux.pio3.ifscer); writel(div & PIO_SCDR_DIV, &pio->mux.pio3.scdr); writel(mask, &pio->ifer); } else { writel(mask, &pio->mux.pio3.ifscdr); } } static void at91_mux_pio3_set_pulldown(struct at91_port *pio, u32 mask, bool is_on) { if (is_on) writel(mask, &pio->pudr); writel(mask, (is_on ? &pio->mux.pio3.ppder : &pio->mux.pio3.ppddr)); } static void at91_mux_pio3_disable_schmitt_trig(struct at91_port *pio, u32 mask) { writel(readl(&pio->schmitt) | mask, &pio->schmitt); } static void set_drive_strength(void *reg, u32 pin, u32 strength) { u32 shift = two_bit_pin_value_shift_amount(pin); clrsetbits_le32(reg, DRIVE_STRENGTH_MASK << shift, strength << shift); } static void at91_mux_sama5d3_set_drivestrength(struct at91_port *pio, u32 pin, u32 setting) { void *reg; reg = &pio->driver12; if (pin >= MAX_NB_GPIO_PER_BANK / 2) reg = &pio->driver2; /* do nothing if setting is zero */ if (!setting) return; /* strength is 1 to 1 with setting for SAMA5 */ set_drive_strength(reg, pin, setting); } static void at91_mux_sam9x5_set_drivestrength(struct at91_port *pio, u32 pin, u32 setting) { void *reg; reg = &pio->driver1; if (pin >= MAX_NB_GPIO_PER_BANK / 2) reg = &pio->driver12; /* do nothing if setting is zero */ if (!setting) return; /* strength is inverse on SAM9x5s with our defines * 0 = hi, 1 = med, 2 = low, 3 = rsvd */ setting = DRIVE_STRENGTH_HI - setting; set_drive_strength(reg, pin, setting); } static struct at91_pinctrl_mux_ops at91rm9200_ops = { .mux_A_periph = at91_mux_set_A_periph, .mux_B_periph = at91_mux_set_B_periph, .set_deglitch = at91_mux_set_deglitch, }; static struct at91_pinctrl_mux_ops at91sam9x5_ops = { .mux_A_periph = at91_mux_pio3_set_A_periph, .mux_B_periph = at91_mux_pio3_set_B_periph, .mux_C_periph = at91_mux_pio3_set_C_periph, .mux_D_periph = at91_mux_pio3_set_D_periph, .set_deglitch = at91_mux_pio3_set_deglitch, .set_debounce = at91_mux_pio3_set_debounce, .set_pulldown = at91_mux_pio3_set_pulldown, .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig, .set_drivestrength = at91_mux_sam9x5_set_drivestrength, }; static struct at91_pinctrl_mux_ops sama5d3_ops = { .mux_A_periph = at91_mux_pio3_set_A_periph, .mux_B_periph = at91_mux_pio3_set_B_periph, .mux_C_periph = at91_mux_pio3_set_C_periph, .mux_D_periph = at91_mux_pio3_set_D_periph, .set_deglitch = at91_mux_pio3_set_deglitch, .set_debounce = at91_mux_pio3_set_debounce, .set_pulldown = at91_mux_pio3_set_pulldown, .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig, .set_drivestrength = at91_mux_sama5d3_set_drivestrength, }; static void at91_mux_gpio_disable(struct at91_port *pio, u32 mask) { writel(mask, &pio->pdr); } static void at91_mux_gpio_enable(struct at91_port *pio, u32 mask, bool input) { writel(mask, &pio->per); writel(mask, (input ? &pio->odr : &pio->oer)); } static int at91_pmx_set(struct at91_pinctrl_mux_ops *ops, struct at91_port *pio, u32 mask, enum at91_mux mux) { at91_mux_disable_interrupt(pio, mask); switch (mux) { case AT91_MUX_GPIO: at91_mux_gpio_enable(pio, mask, 1); break; case AT91_MUX_PERIPH_A: ops->mux_A_periph(pio, mask); break; case AT91_MUX_PERIPH_B: ops->mux_B_periph(pio, mask); break; case AT91_MUX_PERIPH_C: if (!ops->mux_C_periph) return -EINVAL; ops->mux_C_periph(pio, mask); break; case AT91_MUX_PERIPH_D: if (!ops->mux_D_periph) return -EINVAL; ops->mux_D_periph(pio, mask); break; } if (mux) at91_mux_gpio_disable(pio, mask); return 0; } static int at91_pinconf_set(struct at91_pinctrl_mux_ops *ops, struct at91_port *pio, u32 pin, u32 config) { u32 mask = BIT(pin); if ((config & PULL_UP) && (config & PULL_DOWN)) return -EINVAL; at91_mux_set_output(pio, mask, config & OUTPUT, (config & OUTPUT_VAL) >> OUTPUT_VAL_SHIFT); at91_mux_set_pullup(pio, mask, config & PULL_UP); at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE); if (ops->set_deglitch) ops->set_deglitch(pio, mask, config & DEGLITCH); if (ops->set_debounce) ops->set_debounce(pio, mask, config & DEBOUNCE, (config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT); if (ops->set_pulldown) ops->set_pulldown(pio, mask, config & PULL_DOWN); if (ops->disable_schmitt_trig && config & DIS_SCHMIT) ops->disable_schmitt_trig(pio, mask); if (ops->set_drivestrength) ops->set_drivestrength(pio, pin, (config & DRIVE_STRENGTH) >> DRIVE_STRENGTH_SHIFT); return 0; } static int at91_pin_check_config(struct udevice *dev, u32 bank, u32 pin) { struct at91_pinctrl_priv *priv = dev_get_priv(dev); if (bank >= priv->nbanks) { debug("pin conf bank %d >= nbanks %d\n", bank, priv->nbanks); return -EINVAL; } if (pin >= MAX_NB_GPIO_PER_BANK) { debug("pin conf pin %d >= %d\n", pin, MAX_NB_GPIO_PER_BANK); return -EINVAL; } return 0; } static int at91_pinctrl_set_state(struct udevice *dev, struct udevice *config) { struct at91_pinctrl_priv *priv = dev_get_priv(dev); const void *blob = gd->fdt_blob; int node = dev_of_offset(config); u32 cells[MAX_PINMUX_ENTRIES]; const u32 *list = cells; u32 bank, pin; u32 conf, mask, count, i; int size; int ret; enum at91_mux mux; struct at91_port *pio; struct at91_pinctrl_mux_ops *ops = (struct at91_pinctrl_mux_ops *)dev_get_driver_data(dev); /* * the binding format is atmel,pins = , * do sanity check and calculate pins number */ size = fdtdec_get_int_array_count(blob, node, "atmel,pins", cells, ARRAY_SIZE(cells)); /* we do not check return since it's safe node passed down */ count = size >> 2; if (!count) return -EINVAL; for (i = 0; i < count; i++) { bank = *list++; pin = *list++; mux = *list++; conf = *list++; ret = at91_pin_check_config(dev, bank, pin); if (ret) return ret; pio = priv->reg_base[bank]; mask = BIT(pin); ret = at91_pmx_set(ops, pio, mask, mux); if (ret) return ret; ret = at91_pinconf_set(ops, pio, pin, conf); if (ret) return ret; } return 0; } const struct pinctrl_ops at91_pinctrl_ops = { .set_state = at91_pinctrl_set_state, }; static int at91_pinctrl_probe(struct udevice *dev) { struct at91_pinctrl_priv *priv = dev_get_priv(dev); fdt_addr_t addr_base; int index; for (index = 0; index < MAX_GPIO_BANKS; index++) { addr_base = devfdt_get_addr_index(dev, index); if (addr_base == FDT_ADDR_T_NONE) break; priv->reg_base[index] = (struct at91_port *)addr_base; } priv->nbanks = index; return 0; } static const struct udevice_id at91_pinctrl_match[] = { { .compatible = "atmel,sama5d3-pinctrl", .data = (ulong)&sama5d3_ops }, { .compatible = "atmel,at91sam9x5-pinctrl", .data = (ulong)&at91sam9x5_ops }, { .compatible = "atmel,at91rm9200-pinctrl", .data = (ulong)&at91rm9200_ops }, {} }; U_BOOT_DRIVER(at91_pinctrl) = { .name = "pinctrl_at91", .id = UCLASS_PINCTRL, .of_match = at91_pinctrl_match, .probe = at91_pinctrl_probe, .priv_auto_alloc_size = sizeof(struct at91_pinctrl_priv), .ops = &at91_pinctrl_ops, };