123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2019 Philippe Reynes <philippe.reynes@softathome.com>
- *
- * based on:
- * drivers/led/led_bcm6328.c
- * drivers/led/led_bcm6358.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 LED_CTRL_REG 0x00
- #define LED_CTRL_MASK 0x1f
- #define LED_CTRL_LED_TEST_MODE BIT(0)
- #define LED_CTRL_SERIAL_LED_DATA_PPOL BIT(1)
- #define LED_CTRL_SERIAL_LED_CLK_POL BIT(2)
- #define LED_CTRL_SERIAL_LED_EN_POL BIT(3)
- #define LED_CTRL_SERIAL_LED_MSB_FIRST BIT(4)
- /* LED Controller IP LED source select register */
- #define LED_HW_LED_EN_REG 0x08
- /* LED Flash control register0 */
- #define LED_FLASH_RATE_CONTROL_REG0 0x10
- /* Soft LED input register */
- #define LED_SW_LED_IP_REG 0xb8
- /* Parallel LED Output Polarity Register */
- #define LED_PLED_OP_PPOL_REG 0xc0
- struct bcm6858_led_priv {
- void __iomem *regs;
- u8 pin;
- };
- #ifdef CONFIG_LED_BLINK
- /*
- * 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 bcm6858_flash_rate[8] = {
- 0, 40, 80, 160, 320, 640, 1280, 2560
- };
- static u32 bcm6858_flash_rate_value(int period_ms)
- {
- unsigned long value = 7;
- int i;
- for (i = 0; i < ARRAY_SIZE(bcm6858_flash_rate); i++) {
- if (period_ms <= bcm6858_flash_rate[i]) {
- value = i;
- break;
- }
- }
- return value;
- }
- static int bcm6858_led_set_period(struct udevice *dev, int period_ms)
- {
- struct bcm6858_led_priv *priv = dev_get_priv(dev);
- u32 offset, shift, mask, value;
- offset = (priv->pin / 8) * 4;
- shift = (priv->pin % 8) * 4;
- mask = 0x7 << shift;
- value = bcm6858_flash_rate_value(period_ms) << shift;
- clrbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, mask);
- setbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, value);
- return 0;
- }
- #endif
- static enum led_state_t bcm6858_led_get_state(struct udevice *dev)
- {
- struct bcm6858_led_priv *priv = dev_get_priv(dev);
- enum led_state_t state = LEDST_OFF;
- u32 sw_led_ip;
- sw_led_ip = readl(priv->regs + LED_SW_LED_IP_REG);
- if (sw_led_ip & (1 << priv->pin))
- state = LEDST_ON;
- return state;
- }
- static int bcm6858_led_set_state(struct udevice *dev, enum led_state_t state)
- {
- struct bcm6858_led_priv *priv = dev_get_priv(dev);
- switch (state) {
- case LEDST_OFF:
- clrbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
- #ifdef CONFIG_LED_BLINK
- bcm6858_led_set_period(dev, 0);
- #endif
- break;
- case LEDST_ON:
- setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
- #ifdef CONFIG_LED_BLINK
- bcm6858_led_set_period(dev, 0);
- #endif
- break;
- case LEDST_TOGGLE:
- if (bcm6858_led_get_state(dev) == LEDST_OFF)
- return bcm6858_led_set_state(dev, LEDST_ON);
- else
- return bcm6858_led_set_state(dev, LEDST_OFF);
- break;
- #ifdef CONFIG_LED_BLINK
- case LEDST_BLINK:
- setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
- break;
- #endif
- default:
- return -EINVAL;
- }
- return 0;
- }
- static const struct led_ops bcm6858_led_ops = {
- .get_state = bcm6858_led_get_state,
- .set_state = bcm6858_led_set_state,
- #ifdef CONFIG_LED_BLINK
- .set_period = bcm6858_led_set_period,
- #endif
- };
- static int bcm6858_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 |= LED_CTRL_SERIAL_LED_MSB_FIRST;
- if (dev_read_bool(dev, "brcm,serial-led-en-pol"))
- set_bits |= LED_CTRL_SERIAL_LED_EN_POL;
- if (dev_read_bool(dev, "brcm,serial-led-clk-pol"))
- set_bits |= LED_CTRL_SERIAL_LED_CLK_POL;
- if (dev_read_bool(dev, "brcm,serial-led-data-ppol"))
- set_bits |= LED_CTRL_SERIAL_LED_DATA_PPOL;
- if (dev_read_bool(dev, "brcm,led-test-mode"))
- set_bits |= LED_CTRL_LED_TEST_MODE;
- clrsetbits_32(regs + LED_CTRL_REG, ~0, set_bits);
- } else {
- struct bcm6858_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 + LED_HW_LED_EN_REG, 1 << pin);
- /* configure the polarity */
- if (dev_read_bool(dev, "active-low"))
- clrbits_32(regs + LED_PLED_OP_PPOL_REG, 1 << pin);
- else
- setbits_32(regs + LED_PLED_OP_PPOL_REG, 1 << pin);
- }
- return 0;
- }
- static int bcm6858_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, "bcm6858-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 bcm6858_led_ids[] = {
- { .compatible = "brcm,bcm6858-leds" },
- { /* sentinel */ }
- };
- U_BOOT_DRIVER(bcm6858_led) = {
- .name = "bcm6858-led",
- .id = UCLASS_LED,
- .of_match = bcm6858_led_ids,
- .bind = bcm6858_led_bind,
- .probe = bcm6858_led_probe,
- .priv_auto = sizeof(struct bcm6858_led_priv),
- .ops = &bcm6858_led_ops,
- };
|