mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 17:08:52 +09:00
![Álvaro Fernández Rojas](/assets/img/avatar_default.png)
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
214 lines
4.5 KiB
C
214 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <led.h>
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#include <asm/io.h>
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#include <dm/lists.h>
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#define LEDS_MAX 32
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#define LEDS_WAIT 100
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/* LED Mode register */
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#define LED_MODE_REG 0x0
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#define LED_MODE_OFF 0
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#define LED_MODE_ON 1
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#define LED_MODE_MASK 1
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/* LED Control register */
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#define LED_CTRL_REG 0x4
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#define LED_CTRL_CLK_MASK 0x3
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#define LED_CTRL_CLK_1 0
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#define LED_CTRL_CLK_2 1
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#define LED_CTRL_CLK_4 2
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#define LED_CTRL_CLK_8 3
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#define LED_CTRL_POL_SHIFT 2
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#define LED_CTRL_POL_MASK (1 << LED_CTRL_POL_SHIFT)
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#define LED_CTRL_BUSY_SHIFT 3
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#define LED_CTRL_BUSY_MASK (1 << LED_CTRL_BUSY_SHIFT)
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struct bcm6358_led_priv {
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void __iomem *regs;
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uint8_t pin;
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bool active_low;
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};
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static void bcm6358_led_busy(void __iomem *regs)
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{
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while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK)
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udelay(LEDS_WAIT);
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}
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static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv)
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{
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bcm6358_led_busy(priv->regs);
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return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) &
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LED_MODE_MASK;
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}
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static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode)
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{
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bcm6358_led_busy(priv->regs);
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clrsetbits_be32(priv->regs + LED_MODE_REG,
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(LED_MODE_MASK << priv->pin),
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(mode << priv->pin));
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return 0;
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}
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static enum led_state_t bcm6358_led_get_state(struct udevice *dev)
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{
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struct bcm6358_led_priv *priv = dev_get_priv(dev);
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enum led_state_t state = LEDST_OFF;
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switch (bcm6358_led_get_mode(priv)) {
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case LED_MODE_OFF:
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state = (priv->active_low ? LEDST_ON : LEDST_OFF);
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break;
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case LED_MODE_ON:
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state = (priv->active_low ? LEDST_OFF : LEDST_ON);
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break;
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}
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return state;
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}
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static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state)
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{
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struct bcm6358_led_priv *priv = dev_get_priv(dev);
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unsigned long mode;
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switch (state) {
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case LEDST_OFF:
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mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
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break;
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case LEDST_ON:
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mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
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break;
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case LEDST_TOGGLE:
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if (bcm6358_led_get_state(dev) == LEDST_OFF)
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return bcm6358_led_set_state(dev, LEDST_ON);
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else
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return bcm6358_led_set_state(dev, LEDST_OFF);
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break;
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default:
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return -ENOSYS;
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}
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return bcm6358_led_set_mode(priv, mode);
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}
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static const struct led_ops bcm6358_led_ops = {
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.get_state = bcm6358_led_get_state,
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.set_state = bcm6358_led_set_state,
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};
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static int bcm6358_led_probe(struct udevice *dev)
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{
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struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
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/* Top-level LED node */
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if (!uc_plat->label) {
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void __iomem *regs;
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unsigned int clk_div;
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u32 set_bits = 0;
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regs = dev_remap_addr(dev);
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if (!regs)
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return -EINVAL;
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if (dev_read_bool(dev, "brcm,clk-dat-low"))
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set_bits |= LED_CTRL_POL_MASK;
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clk_div = dev_read_u32_default(dev, "brcm,clk-div",
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LED_CTRL_CLK_1);
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switch (clk_div) {
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case 8:
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set_bits |= LED_CTRL_CLK_8;
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break;
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case 4:
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set_bits |= LED_CTRL_CLK_4;
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break;
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case 2:
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set_bits |= LED_CTRL_CLK_2;
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break;
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default:
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set_bits |= LED_CTRL_CLK_1;
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break;
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}
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bcm6358_led_busy(regs);
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clrsetbits_be32(regs + LED_CTRL_REG,
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LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
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set_bits);
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} else {
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struct bcm6358_led_priv *priv = dev_get_priv(dev);
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unsigned int pin;
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priv->regs = dev_remap_addr(dev);
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if (!priv->regs)
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return -EINVAL;
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pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
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if (pin >= LEDS_MAX)
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return -EINVAL;
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priv->pin = pin;
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if (dev_read_bool(dev, "active-low"))
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priv->active_low = true;
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}
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return 0;
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}
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static int bcm6358_led_bind(struct udevice *parent)
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{
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ofnode node;
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dev_for_each_subnode(node, parent) {
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struct led_uc_plat *uc_plat;
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struct udevice *dev;
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const char *label;
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int ret;
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label = ofnode_read_string(node, "label");
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if (!label) {
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debug("%s: node %s has no label\n", __func__,
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ofnode_get_name(node));
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return -EINVAL;
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}
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ret = device_bind_driver_to_node(parent, "bcm6358-led",
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ofnode_get_name(node),
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node, &dev);
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if (ret)
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return ret;
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uc_plat = dev_get_uclass_platdata(dev);
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uc_plat->label = label;
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}
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return 0;
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}
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static const struct udevice_id bcm6358_led_ids[] = {
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{ .compatible = "brcm,bcm6358-leds" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(bcm6358_led) = {
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.name = "bcm6358-led",
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.id = UCLASS_LED,
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.of_match = bcm6358_led_ids,
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.bind = bcm6358_led_bind,
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.probe = bcm6358_led_probe,
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.priv_auto_alloc_size = sizeof(struct bcm6358_led_priv),
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.ops = &bcm6358_led_ops,
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};
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