1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
16 /* LED Mode register */
17 #define LED_MODE_REG 0x0
18 #define LED_MODE_OFF 0
20 #define LED_MODE_MASK 1
22 /* LED Control register */
23 #define LED_CTRL_REG 0x4
24 #define LED_CTRL_CLK_MASK 0x3
25 #define LED_CTRL_CLK_1 0
26 #define LED_CTRL_CLK_2 1
27 #define LED_CTRL_CLK_4 2
28 #define LED_CTRL_CLK_8 3
29 #define LED_CTRL_POL_SHIFT 2
30 #define LED_CTRL_POL_MASK (1 << LED_CTRL_POL_SHIFT)
31 #define LED_CTRL_BUSY_SHIFT 3
32 #define LED_CTRL_BUSY_MASK (1 << LED_CTRL_BUSY_SHIFT)
34 DECLARE_GLOBAL_DATA_PTR;
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);
120 /* Top-level LED node */
121 if (!uc_plat->label) {
123 unsigned int clk_div;
126 addr = devfdt_get_addr_size_index(dev, 0, &size);
127 if (addr == FDT_ADDR_T_NONE)
130 regs = ioremap(addr, size);
132 if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
134 set_bits |= LED_CTRL_POL_MASK;
135 clk_div = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
136 "brcm,clk-div", LED_CTRL_CLK_1);
139 set_bits |= LED_CTRL_CLK_8;
142 set_bits |= LED_CTRL_CLK_4;
145 set_bits |= LED_CTRL_CLK_2;
148 set_bits |= LED_CTRL_CLK_1;
152 bcm6358_led_busy(regs);
153 clrsetbits_be32(regs + LED_CTRL_REG,
154 LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
157 struct bcm6358_led_priv *priv = dev_get_priv(dev);
160 addr = devfdt_get_addr_size_index(dev_get_parent(dev), 0,
162 if (addr == FDT_ADDR_T_NONE)
165 pin = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), "reg",
170 priv->regs = ioremap(addr, size);
173 if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
175 priv->active_low = true;
181 static int bcm6358_led_bind(struct udevice *parent)
183 const void *blob = gd->fdt_blob;
186 for (node = fdt_first_subnode(blob, dev_of_offset(parent));
188 node = fdt_next_subnode(blob, node)) {
189 struct led_uc_plat *uc_plat;
194 label = fdt_getprop(blob, node, "label", NULL);
196 debug("%s: node %s has no label\n", __func__,
197 fdt_get_name(blob, node, NULL));
201 ret = device_bind_driver_to_node(parent, "bcm6358-led",
202 fdt_get_name(blob, node, NULL),
203 offset_to_ofnode(node), &dev);
207 uc_plat = dev_get_uclass_platdata(dev);
208 uc_plat->label = label;
214 static const struct udevice_id bcm6358_led_ids[] = {
215 { .compatible = "brcm,bcm6358-leds" },
219 U_BOOT_DRIVER(bcm6358_led) = {
220 .name = "bcm6358-led",
222 .of_match = bcm6358_led_ids,
223 .bind = bcm6358_led_bind,
224 .probe = bcm6358_led_probe,
225 .priv_auto_alloc_size = sizeof(struct bcm6358_led_priv),
226 .ops = &bcm6358_led_ops,