1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
17 /* LED Mode register */
18 #define LED_MODE_REG 0x0
19 #define LED_MODE_OFF 0
21 #define LED_MODE_MASK 1
23 /* LED Control register */
24 #define LED_CTRL_REG 0x4
25 #define LED_CTRL_CLK_MASK 0x3
26 #define LED_CTRL_CLK_1 0
27 #define LED_CTRL_CLK_2 1
28 #define LED_CTRL_CLK_4 2
29 #define LED_CTRL_CLK_8 3
30 #define LED_CTRL_POL_SHIFT 2
31 #define LED_CTRL_POL_MASK (1 << LED_CTRL_POL_SHIFT)
32 #define LED_CTRL_BUSY_SHIFT 3
33 #define LED_CTRL_BUSY_MASK (1 << LED_CTRL_BUSY_SHIFT)
35 struct bcm6358_led_priv {
41 static void bcm6358_led_busy(void __iomem *regs)
43 while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK)
47 static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv)
49 bcm6358_led_busy(priv->regs);
51 return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) &
55 static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode)
57 bcm6358_led_busy(priv->regs);
59 clrsetbits_be32(priv->regs + LED_MODE_REG,
60 (LED_MODE_MASK << priv->pin),
66 static enum led_state_t bcm6358_led_get_state(struct udevice *dev)
68 struct bcm6358_led_priv *priv = dev_get_priv(dev);
69 enum led_state_t state = LEDST_OFF;
71 switch (bcm6358_led_get_mode(priv)) {
73 state = (priv->active_low ? LEDST_ON : LEDST_OFF);
76 state = (priv->active_low ? LEDST_OFF : LEDST_ON);
83 static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state)
85 struct bcm6358_led_priv *priv = dev_get_priv(dev);
90 mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
93 mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
96 if (bcm6358_led_get_state(dev) == LEDST_OFF)
97 return bcm6358_led_set_state(dev, LEDST_ON);
99 return bcm6358_led_set_state(dev, LEDST_OFF);
105 return bcm6358_led_set_mode(priv, mode);
108 static const struct led_ops bcm6358_led_ops = {
109 .get_state = bcm6358_led_get_state,
110 .set_state = bcm6358_led_set_state,
113 static int bcm6358_led_probe(struct udevice *dev)
115 struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
117 /* Top-level LED node */
118 if (!uc_plat->label) {
120 unsigned int clk_div;
123 regs = dev_remap_addr(dev);
127 if (dev_read_bool(dev, "brcm,clk-dat-low"))
128 set_bits |= LED_CTRL_POL_MASK;
129 clk_div = dev_read_u32_default(dev, "brcm,clk-div",
133 set_bits |= LED_CTRL_CLK_8;
136 set_bits |= LED_CTRL_CLK_4;
139 set_bits |= LED_CTRL_CLK_2;
142 set_bits |= LED_CTRL_CLK_1;
146 bcm6358_led_busy(regs);
147 clrsetbits_be32(regs + LED_CTRL_REG,
148 LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
151 struct bcm6358_led_priv *priv = dev_get_priv(dev);
154 priv->regs = dev_remap_addr(dev);
158 pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
164 if (dev_read_bool(dev, "active-low"))
165 priv->active_low = true;
171 static int bcm6358_led_bind(struct udevice *parent)
175 dev_for_each_subnode(node, parent) {
176 struct led_uc_plat *uc_plat;
181 label = ofnode_read_string(node, "label");
183 debug("%s: node %s has no label\n", __func__,
184 ofnode_get_name(node));
188 ret = device_bind_driver_to_node(parent, "bcm6358-led",
189 ofnode_get_name(node),
194 uc_plat = dev_get_uclass_platdata(dev);
195 uc_plat->label = label;
201 static const struct udevice_id bcm6358_led_ids[] = {
202 { .compatible = "brcm,bcm6358-leds" },
206 U_BOOT_DRIVER(bcm6358_led) = {
207 .name = "bcm6358-led",
209 .of_match = bcm6358_led_ids,
210 .bind = bcm6358_led_bind,
211 .probe = bcm6358_led_probe,
212 .priv_auto_alloc_size = sizeof(struct bcm6358_led_priv),
213 .ops = &bcm6358_led_ops,