Tom Rini | 83d290c | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com> |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 4 | */ |
| 5 | |
| 6 | #include <common.h> |
| 7 | #include <dm.h> |
| 8 | #include <errno.h> |
| 9 | #include <led.h> |
| 10 | #include <asm/io.h> |
| 11 | #include <dm/lists.h> |
| 12 | |
| 13 | #define LEDS_MAX 32 |
| 14 | #define LEDS_WAIT 100 |
| 15 | |
| 16 | /* LED Mode register */ |
| 17 | #define LED_MODE_REG 0x0 |
| 18 | #define LED_MODE_OFF 0 |
| 19 | #define LED_MODE_ON 1 |
| 20 | #define LED_MODE_MASK 1 |
| 21 | |
| 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) |
| 33 | |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 34 | struct bcm6358_led_priv { |
| 35 | void __iomem *regs; |
| 36 | uint8_t pin; |
| 37 | bool active_low; |
| 38 | }; |
| 39 | |
| 40 | static void bcm6358_led_busy(void __iomem *regs) |
| 41 | { |
| 42 | while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK) |
| 43 | udelay(LEDS_WAIT); |
| 44 | } |
| 45 | |
| 46 | static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv) |
| 47 | { |
| 48 | bcm6358_led_busy(priv->regs); |
| 49 | |
| 50 | return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) & |
| 51 | LED_MODE_MASK; |
| 52 | } |
| 53 | |
| 54 | static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode) |
| 55 | { |
| 56 | bcm6358_led_busy(priv->regs); |
| 57 | |
| 58 | clrsetbits_be32(priv->regs + LED_MODE_REG, |
| 59 | (LED_MODE_MASK << priv->pin), |
| 60 | (mode << priv->pin)); |
| 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static enum led_state_t bcm6358_led_get_state(struct udevice *dev) |
| 66 | { |
| 67 | struct bcm6358_led_priv *priv = dev_get_priv(dev); |
| 68 | enum led_state_t state = LEDST_OFF; |
| 69 | |
| 70 | switch (bcm6358_led_get_mode(priv)) { |
| 71 | case LED_MODE_OFF: |
| 72 | state = (priv->active_low ? LEDST_ON : LEDST_OFF); |
| 73 | break; |
| 74 | case LED_MODE_ON: |
| 75 | state = (priv->active_low ? LEDST_OFF : LEDST_ON); |
| 76 | break; |
| 77 | } |
| 78 | |
| 79 | return state; |
| 80 | } |
| 81 | |
| 82 | static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state) |
| 83 | { |
| 84 | struct bcm6358_led_priv *priv = dev_get_priv(dev); |
| 85 | unsigned long mode; |
| 86 | |
| 87 | switch (state) { |
| 88 | case LEDST_OFF: |
| 89 | mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF); |
| 90 | break; |
| 91 | case LEDST_ON: |
| 92 | mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON); |
| 93 | break; |
| 94 | case LEDST_TOGGLE: |
| 95 | if (bcm6358_led_get_state(dev) == LEDST_OFF) |
| 96 | return bcm6358_led_set_state(dev, LEDST_ON); |
| 97 | else |
| 98 | return bcm6358_led_set_state(dev, LEDST_OFF); |
| 99 | break; |
| 100 | default: |
| 101 | return -ENOSYS; |
| 102 | } |
| 103 | |
| 104 | return bcm6358_led_set_mode(priv, mode); |
| 105 | } |
| 106 | |
| 107 | static const struct led_ops bcm6358_led_ops = { |
| 108 | .get_state = bcm6358_led_get_state, |
| 109 | .set_state = bcm6358_led_set_state, |
| 110 | }; |
| 111 | |
| 112 | static int bcm6358_led_probe(struct udevice *dev) |
| 113 | { |
| 114 | struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev); |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 115 | |
| 116 | /* Top-level LED node */ |
| 117 | if (!uc_plat->label) { |
| 118 | void __iomem *regs; |
| 119 | unsigned int clk_div; |
| 120 | u32 set_bits = 0; |
| 121 | |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 122 | regs = dev_remap_addr(dev); |
| 123 | if (!regs) |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 124 | return -EINVAL; |
| 125 | |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 126 | if (dev_read_bool(dev, "brcm,clk-dat-low")) |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 127 | set_bits |= LED_CTRL_POL_MASK; |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 128 | clk_div = dev_read_u32_default(dev, "brcm,clk-div", |
| 129 | LED_CTRL_CLK_1); |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 130 | switch (clk_div) { |
| 131 | case 8: |
| 132 | set_bits |= LED_CTRL_CLK_8; |
| 133 | break; |
| 134 | case 4: |
| 135 | set_bits |= LED_CTRL_CLK_4; |
| 136 | break; |
| 137 | case 2: |
| 138 | set_bits |= LED_CTRL_CLK_2; |
| 139 | break; |
| 140 | default: |
| 141 | set_bits |= LED_CTRL_CLK_1; |
| 142 | break; |
| 143 | } |
| 144 | |
| 145 | bcm6358_led_busy(regs); |
| 146 | clrsetbits_be32(regs + LED_CTRL_REG, |
| 147 | LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK, |
| 148 | set_bits); |
| 149 | } else { |
| 150 | struct bcm6358_led_priv *priv = dev_get_priv(dev); |
| 151 | unsigned int pin; |
| 152 | |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 153 | priv->regs = dev_remap_addr(dev); |
| 154 | if (!priv->regs) |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 155 | return -EINVAL; |
| 156 | |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 157 | pin = dev_read_u32_default(dev, "reg", LEDS_MAX); |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 158 | if (pin >= LEDS_MAX) |
| 159 | return -EINVAL; |
| 160 | |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 161 | priv->pin = pin; |
| 162 | |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 163 | if (dev_read_bool(dev, "active-low")) |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 164 | priv->active_low = true; |
| 165 | } |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | static int bcm6358_led_bind(struct udevice *parent) |
| 171 | { |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 172 | ofnode node; |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 173 | |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 174 | dev_for_each_subnode(node, parent) { |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 175 | struct led_uc_plat *uc_plat; |
| 176 | struct udevice *dev; |
| 177 | const char *label; |
| 178 | int ret; |
| 179 | |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 180 | label = ofnode_read_string(node, "label"); |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 181 | if (!label) { |
| 182 | debug("%s: node %s has no label\n", __func__, |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 183 | ofnode_get_name(node)); |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 184 | return -EINVAL; |
| 185 | } |
| 186 | |
| 187 | ret = device_bind_driver_to_node(parent, "bcm6358-led", |
Álvaro Fernández Rojas | a15c16f | 2018-03-22 19:39:33 +0100 | [diff] [blame] | 188 | ofnode_get_name(node), |
| 189 | node, &dev); |
Álvaro Fernández Rojas | 632889c | 2017-05-07 20:11:30 +0200 | [diff] [blame] | 190 | if (ret) |
| 191 | return ret; |
| 192 | |
| 193 | uc_plat = dev_get_uclass_platdata(dev); |
| 194 | uc_plat->label = label; |
| 195 | } |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static const struct udevice_id bcm6358_led_ids[] = { |
| 201 | { .compatible = "brcm,bcm6358-leds" }, |
| 202 | { /* sentinel */ } |
| 203 | }; |
| 204 | |
| 205 | U_BOOT_DRIVER(bcm6358_led) = { |
| 206 | .name = "bcm6358-led", |
| 207 | .id = UCLASS_LED, |
| 208 | .of_match = bcm6358_led_ids, |
| 209 | .bind = bcm6358_led_bind, |
| 210 | .probe = bcm6358_led_probe, |
| 211 | .priv_auto_alloc_size = sizeof(struct bcm6358_led_priv), |
| 212 | .ops = &bcm6358_led_ops, |
| 213 | }; |