Add the support of the LED IP for bcm6357. This LED IP supports blinking, fading and pulsating, but for the moment, only blinking is supported.
Signed-off-by: Philippe Reynes philippe.reynes@softathome.com --- drivers/led/Kconfig | 7 + drivers/led/Makefile | 1 + drivers/led/led_bcm6753.c | 270 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 278 insertions(+) create mode 100644 drivers/led/led_bcm6753.c
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig index cc87fbf395..430d0760ba 100644 --- a/drivers/led/Kconfig +++ b/drivers/led/Kconfig @@ -28,6 +28,13 @@ config LED_BCM6358 LED HW controller accessed via MMIO registers. HW has no blinking capabilities and up to 32 LEDs can be controlled.
+config LED_BCM6753 + bool "LED Support for BCM6753" + depends on LED && ARCH_BCM6753 + help + This option enables support for LEDs connected to the BCM6753 + HW has blinking and fading capabilities and up to 32 LEDs can be controlled. + config LED_BCM6858 bool "LED Support for BCM6858" depends on LED && (ARCH_BCM68360 || ARCH_BCM6858 || ARCH_BCM63158) diff --git a/drivers/led/Makefile b/drivers/led/Makefile index 8e3ae7f146..2aa2c2173a 100644 --- a/drivers/led/Makefile +++ b/drivers/led/Makefile @@ -6,6 +6,7 @@ obj-y += led-uclass.o obj-$(CONFIG_LED_BCM6328) += led_bcm6328.o obj-$(CONFIG_LED_BCM6358) += led_bcm6358.o +obj-$(CONFIG_LED_BCM6753) += led_bcm6753.o obj-$(CONFIG_LED_BCM6858) += led_bcm6858.o obj-$(CONFIG_$(SPL_)LED_GPIO) += led_gpio.o obj-$(CONFIG_LED_CORTINA) += led_cortina.o diff --git a/drivers/led/led_bcm6753.c b/drivers/led/led_bcm6753.c new file mode 100644 index 0000000000..a32bd8204f --- /dev/null +++ b/drivers/led/led_bcm6753.c @@ -0,0 +1,270 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2022 Philippe Reynes philippe.reynes@softathome.com + * + * based on: + * drivers/led/led_bcm6858.c + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <led.h> +#include <log.h> +#include <asm/io.h> +#include <dm/lists.h> +#include <linux/bitops.h> + +#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, +};