2 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
4 * SPDX-License-Identifier: GPL-2.0+
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 DECLARE_GLOBAL_DATA_PTR;
37 struct bcm6358_led_priv {
43 static void bcm6358_led_busy(void __iomem *regs)
45 while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK)
49 static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv)
51 bcm6358_led_busy(priv->regs);
53 return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) &
57 static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode)
59 bcm6358_led_busy(priv->regs);
61 clrsetbits_be32(priv->regs + LED_MODE_REG,
62 (LED_MODE_MASK << priv->pin),
68 static enum led_state_t bcm6358_led_get_state(struct udevice *dev)
70 struct bcm6358_led_priv *priv = dev_get_priv(dev);
71 enum led_state_t state = LEDST_OFF;
73 switch (bcm6358_led_get_mode(priv)) {
75 state = (priv->active_low ? LEDST_ON : LEDST_OFF);
78 state = (priv->active_low ? LEDST_OFF : LEDST_ON);
85 static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state)
87 struct bcm6358_led_priv *priv = dev_get_priv(dev);
92 mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
95 mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
98 if (bcm6358_led_get_state(dev) == LEDST_OFF)
99 return bcm6358_led_set_state(dev, LEDST_ON);
101 return bcm6358_led_set_state(dev, LEDST_OFF);
107 return bcm6358_led_set_mode(priv, mode);
110 static const struct led_ops bcm6358_led_ops = {
111 .get_state = bcm6358_led_get_state,
112 .set_state = bcm6358_led_set_state,
115 static int bcm6358_led_probe(struct udevice *dev)
117 struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
121 /* Top-level LED node */
122 if (!uc_plat->label) {
124 unsigned int clk_div;
127 addr = dev_get_addr_size_index(dev, 0, &size);
128 if (addr == FDT_ADDR_T_NONE)
131 regs = ioremap(addr, size);
133 if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
135 set_bits |= LED_CTRL_POL_MASK;
136 clk_div = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
137 "brcm,clk-div", LED_CTRL_CLK_1);
140 set_bits |= LED_CTRL_CLK_8;
143 set_bits |= LED_CTRL_CLK_4;
146 set_bits |= LED_CTRL_CLK_2;
149 set_bits |= LED_CTRL_CLK_1;
153 bcm6358_led_busy(regs);
154 clrsetbits_be32(regs + LED_CTRL_REG,
155 LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
158 struct bcm6358_led_priv *priv = dev_get_priv(dev);
161 addr = dev_get_addr_size_index(dev_get_parent(dev), 0, &size);
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),
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,