// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2022 Philippe Reynes * * based on: * drivers/led/led_bcm6858.c */ #include #include #include #include #include #include #include #include #define LEDS_MAX 32 #define LEDS_WAIT 100 /* LED Mode register */ #define LED_MODE_REG 0x0 #define LED_MODE_OFF 0 #define LED_MODE_ON 1 #define LED_MODE_MASK 1 /* LED Controller Global settings register */ #define CLED_CTRL_REG 0x00 #define CLED_CTRL_SERIAL_LED_DATA_PPOL BIT(1) #define CLED_CTRL_SERIAL_LED_CLK_POL BIT(2) #define CLED_CTRL_SERIAL_LED_EN_POL BIT(3) #define CLED_CTRL_SERIAL_LED_MSB_FIRST BIT(4) #define CLED_CTRL_MASK 0x1E /* LED Controller IP LED source select register */ #define CLED_HW_LED_EN_REG 0x04 /* Hardware LED Polarity register */ #define CLED_HW_LED_IP_PPOL_REG 0x0c /* Soft LED Set Register */ #define CLED_SW_LED_IP_SET_REG 0x10 /* Parallel LED Output Polarity Register */ #define CLED_PLED_OP_PPOL_REG 0x18 /* LED Channel activate register */ #define CLED_LED_CH_ACTIVATE_REG 0x1c /* LED 0 Config 0 reg */ #define CLED_LED_0_CONFIG_0 0x20 /* Soft LED Clear Register */ #define CLED_SW_LED_IP_CLEAR_REG 0x444 /* Soft LED Status Register */ #define CLED_SW_LED_IP_STATUS_REG 0x448 /* Size of all registers used for the config of one LED */ #define CLED_CONFIG_SIZE (4 * sizeof(u32)) #define CLED_CONFIG0_MODE 0 #define CLED_CONFIG0_MODE_MASK (BIT(0) | BIT(1)) #define CLED_CONFIG0_MODE_STEADY 0 #define CLED_CONFIG0_MODE_FADING 1 #define CLED_CONFIG0_MODE_PULSATING 2 #define CLED_CONFIG0_FLASH_CTRL_SHIFT 3 #define CLED_CONFIG0_FLASH_CTRL_MASK (BIT(3) | BIT(4) | BIT(5)) struct bcm6753_led_priv { void __iomem *regs; u8 pin; }; /* * The value for flash rate are: * 0 : no blinking * 1 : rate is 25 Hz => 40 ms (period) * 2 : rate is 12.5 Hz => 80 ms (period) * 3 : rate is 6.25 Hz => 160 ms (period) * 4 : rate is 3.125 Hz => 320 ms (period) * 5 : rate is 1.5625 Hz => 640 ms (period) * 6 : rate is 0.7815 Hz => 1280 ms (period) * 7 : rate is 0.390625 Hz => 2560 ms (period) */ static const int bcm6753_flash_rate[8] = { 0, 40, 80, 160, 320, 640, 1280, 2560 }; static u32 bcm6753_flash_rate_value(int period_ms) { unsigned long value = 7; int i; for (i = 0; i < ARRAY_SIZE(bcm6753_flash_rate); i++) { if (period_ms <= bcm6753_flash_rate[i]) { value = i; break; } } return value; } static int bcm6753_led_set_period(struct udevice *dev, int period_ms) { struct bcm6753_led_priv *priv = dev_get_priv(dev); u32 offset, shift, value; offset = CLED_LED_0_CONFIG_0 + (CLED_CONFIG_SIZE * priv->pin); value = bcm6753_flash_rate_value(period_ms); shift = CLED_CONFIG0_FLASH_CTRL_SHIFT; /* set mode steady */ clrbits_32(priv->regs + offset, CLED_CONFIG0_MODE_MASK); setbits_32(priv->regs + offset, CLED_CONFIG0_MODE_STEADY); /* set flash rate */ clrbits_32(priv->regs + offset, CLED_CONFIG0_FLASH_CTRL_MASK); setbits_32(priv->regs + offset, value << shift); /* enable config */ setbits_32(priv->regs + CLED_LED_CH_ACTIVATE_REG, 1 << priv->pin); return 0; } static enum led_state_t bcm6753_led_get_state(struct udevice *dev) { struct bcm6753_led_priv *priv = dev_get_priv(dev); enum led_state_t state = LEDST_OFF; u32 sw_led_ip_status; sw_led_ip_status = readl(priv->regs + CLED_SW_LED_IP_STATUS_REG); if (sw_led_ip_status & (1 << priv->pin)) state = LEDST_ON; return state; } static int bcm6753_led_set_state(struct udevice *dev, enum led_state_t state) { struct bcm6753_led_priv *priv = dev_get_priv(dev); switch (state) { case LEDST_OFF: setbits_32(priv->regs + CLED_SW_LED_IP_CLEAR_REG, (1 << priv->pin)); if (IS_ENABLED(CONFIG_LED_BLINK)) bcm6753_led_set_period(dev, 0); break; case LEDST_ON: setbits_32(priv->regs + CLED_SW_LED_IP_SET_REG, (1 << priv->pin)); if (IS_ENABLED(CONFIG_LED_BLINK)) bcm6753_led_set_period(dev, 0); break; case LEDST_TOGGLE: if (bcm6753_led_get_state(dev) == LEDST_OFF) return bcm6753_led_set_state(dev, LEDST_ON); else return bcm6753_led_set_state(dev, LEDST_OFF); break; #ifdef CONFIG_LED_BLINK case LEDST_BLINK: setbits_32(priv->regs + CLED_SW_LED_IP_SET_REG, (1 << priv->pin)); break; #endif default: return -EINVAL; } return 0; } static const struct led_ops bcm6753_led_ops = { .get_state = bcm6753_led_get_state, .set_state = bcm6753_led_set_state, #ifdef CONFIG_LED_BLINK .set_period = bcm6753_led_set_period, #endif }; static int bcm6753_led_probe(struct udevice *dev) { struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev); /* Top-level LED node */ if (!uc_plat->label) { void __iomem *regs; u32 set_bits = 0; regs = dev_remap_addr(dev); if (!regs) return -EINVAL; if (dev_read_bool(dev, "brcm,serial-led-msb-first")) set_bits |= CLED_CTRL_SERIAL_LED_MSB_FIRST; if (dev_read_bool(dev, "brcm,serial-led-en-pol")) set_bits |= CLED_CTRL_SERIAL_LED_EN_POL; if (dev_read_bool(dev, "brcm,serial-led-clk-pol")) set_bits |= CLED_CTRL_SERIAL_LED_CLK_POL; if (dev_read_bool(dev, "brcm,serial-led-data-ppol")) set_bits |= CLED_CTRL_SERIAL_LED_DATA_PPOL; clrsetbits_32(regs + CLED_CTRL_REG, CLED_CTRL_MASK, set_bits); } else { struct bcm6753_led_priv *priv = dev_get_priv(dev); void __iomem *regs; unsigned int pin; regs = dev_remap_addr(dev_get_parent(dev)); if (!regs) return -EINVAL; pin = dev_read_u32_default(dev, "reg", LEDS_MAX); if (pin >= LEDS_MAX) return -EINVAL; priv->regs = regs; priv->pin = pin; /* this led is managed by software */ clrbits_32(regs + CLED_HW_LED_EN_REG, 1 << pin); /* configure the polarity */ if (dev_read_bool(dev, "active-low")) clrbits_32(regs + CLED_PLED_OP_PPOL_REG, 1 << pin); else setbits_32(regs + CLED_PLED_OP_PPOL_REG, 1 << pin); } return 0; } static int bcm6753_led_bind(struct udevice *parent) { ofnode node; dev_for_each_subnode(node, parent) { struct led_uc_plat *uc_plat; struct udevice *dev; const char *label; int ret; label = ofnode_read_string(node, "label"); if (!label) { debug("%s: node %s has no label\n", __func__, ofnode_get_name(node)); return -EINVAL; } ret = device_bind_driver_to_node(parent, "bcm6753-led", ofnode_get_name(node), node, &dev); if (ret) return ret; uc_plat = dev_get_uclass_plat(dev); uc_plat->label = label; } return 0; } static const struct udevice_id bcm6753_led_ids[] = { { .compatible = "brcm,bcm6753-leds" }, { /* sentinel */ } }; U_BOOT_DRIVER(bcm6753_led) = { .name = "bcm6753-led", .id = UCLASS_LED, .of_match = bcm6753_led_ids, .bind = bcm6753_led_bind, .probe = bcm6753_led_probe, .priv_auto = sizeof(struct bcm6753_led_priv), .ops = &bcm6753_led_ops, };