1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
13 #include <linux/delay.h>
18 /* LED Mode register */
19 #define LED_MODE_REG 0x0
20 #define LED_MODE_OFF 0
22 #define LED_MODE_MASK 1
24 /* LED Control register */
25 #define LED_CTRL_REG 0x4
26 #define LED_CTRL_CLK_MASK 0x3
27 #define LED_CTRL_CLK_1 0
28 #define LED_CTRL_CLK_2 1
29 #define LED_CTRL_CLK_4 2
30 #define LED_CTRL_CLK_8 3
31 #define LED_CTRL_POL_SHIFT 2
32 #define LED_CTRL_POL_MASK (1 << LED_CTRL_POL_SHIFT)
33 #define LED_CTRL_BUSY_SHIFT 3
34 #define LED_CTRL_BUSY_MASK (1 << LED_CTRL_BUSY_SHIFT)
36 struct bcm6358_led_priv {
42 static void bcm6358_led_busy(void __iomem *regs)
44 while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK)
48 static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv)
50 bcm6358_led_busy(priv->regs);
52 return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) &
56 static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode)
58 bcm6358_led_busy(priv->regs);
60 clrsetbits_be32(priv->regs + LED_MODE_REG,
61 (LED_MODE_MASK << priv->pin),
67 static enum led_state_t bcm6358_led_get_state(struct udevice *dev)
69 struct bcm6358_led_priv *priv = dev_get_priv(dev);
70 enum led_state_t state = LEDST_OFF;
72 switch (bcm6358_led_get_mode(priv)) {
74 state = (priv->active_low ? LEDST_ON : LEDST_OFF);
77 state = (priv->active_low ? LEDST_OFF : LEDST_ON);
84 static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state)
86 struct bcm6358_led_priv *priv = dev_get_priv(dev);
91 mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
94 mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
97 if (bcm6358_led_get_state(dev) == LEDST_OFF)
98 return bcm6358_led_set_state(dev, LEDST_ON);
100 return bcm6358_led_set_state(dev, LEDST_OFF);
106 return bcm6358_led_set_mode(priv, mode);
109 static const struct led_ops bcm6358_led_ops = {
110 .get_state = bcm6358_led_get_state,
111 .set_state = bcm6358_led_set_state,
114 static int bcm6358_led_probe(struct udevice *dev)
116 struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
118 /* Top-level LED node */
119 if (!uc_plat->label) {
121 unsigned int clk_div;
124 regs = dev_remap_addr(dev);
128 if (dev_read_bool(dev, "brcm,clk-dat-low"))
129 set_bits |= LED_CTRL_POL_MASK;
130 clk_div = dev_read_u32_default(dev, "brcm,clk-div",
134 set_bits |= LED_CTRL_CLK_8;
137 set_bits |= LED_CTRL_CLK_4;
140 set_bits |= LED_CTRL_CLK_2;
143 set_bits |= LED_CTRL_CLK_1;
147 bcm6358_led_busy(regs);
148 clrsetbits_be32(regs + LED_CTRL_REG,
149 LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
152 struct bcm6358_led_priv *priv = dev_get_priv(dev);
155 priv->regs = dev_remap_addr(dev);
159 pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
165 if (dev_read_bool(dev, "active-low"))
166 priv->active_low = true;
172 static int bcm6358_led_bind(struct udevice *parent)
176 dev_for_each_subnode(node, parent) {
177 struct led_uc_plat *uc_plat;
182 label = ofnode_read_string(node, "label");
184 debug("%s: node %s has no label\n", __func__,
185 ofnode_get_name(node));
189 ret = device_bind_driver_to_node(parent, "bcm6358-led",
190 ofnode_get_name(node),
195 uc_plat = dev_get_uclass_platdata(dev);
196 uc_plat->label = label;
202 static const struct udevice_id bcm6358_led_ids[] = {
203 { .compatible = "brcm,bcm6358-leds" },
207 U_BOOT_DRIVER(bcm6358_led) = {
208 .name = "bcm6358-led",
210 .of_match = bcm6358_led_ids,
211 .bind = bcm6358_led_bind,
212 .probe = bcm6358_led_probe,
213 .priv_auto_alloc_size = sizeof(struct bcm6358_led_priv),
214 .ops = &bcm6358_led_ops,