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https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
We use 'priv' for private data but often use 'platdata' for platform data. We can't really use 'pdata' since that is ambiguous (it could mean private or platform data). Rename some of the latter variables to end with 'plat' for consistency. Signed-off-by: Simon Glass <sjg@chromium.org>
216 lines
4.5 KiB
C
216 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 <log.h>
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#include <asm/io.h>
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#include <dm/lists.h>
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#include <linux/delay.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_plat(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_plat(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 = sizeof(struct bcm6358_led_priv),
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.ops = &bcm6358_led_ops,
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};
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