drivers/led/led_bcm6328.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
   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                        24
  14
  15 /* LED Init register */
  16 #define LED_INIT_REG                    0x00
  17 #define LED_INIT_FASTINTV_MS            20
  18 #define LED_INIT_FASTINTV_SHIFT         6
  19 #define LED_INIT_FASTINTV_MASK          (0x3f << LED_INIT_FASTINTV_SHIFT)
  20 #define LED_INIT_SLEDEN_SHIFT           12
  21 #define LED_INIT_SLEDEN_MASK            (1 << LED_INIT_SLEDEN_SHIFT)
  22 #define LED_INIT_SLEDMUX_SHIFT          13
  23 #define LED_INIT_SLEDMUX_MASK           (1 << LED_INIT_SLEDMUX_SHIFT)
  24 #define LED_INIT_SLEDCLKNPOL_SHIFT      14
  25 #define LED_INIT_SLEDCLKNPOL_MASK       (1 << LED_INIT_SLEDCLKNPOL_SHIFT)
  26 #define LED_INIT_SLEDDATAPPOL_SHIFT     15
  27 #define LED_INIT_SLEDDATANPOL_MASK      (1 << LED_INIT_SLEDDATAPPOL_SHIFT)
  28 #define LED_INIT_SLEDSHIFTDIR_SHIFT     16
  29 #define LED_INIT_SLEDSHIFTDIR_MASK      (1 << LED_INIT_SLEDSHIFTDIR_SHIFT)
  30
  31 /* LED Mode registers */
  32 #define LED_MODE_REG_HI                 0x04
  33 #define LED_MODE_REG_LO                 0x08
  34 #define LED_MODE_ON                     0
  35 #define LED_MODE_FAST                   1
  36 #define LED_MODE_BLINK                  2
  37 #define LED_MODE_OFF                    3
  38 #define LED_MODE_MASK                   0x3
  39
  40 DECLARE_GLOBAL_DATA_PTR;
  41
  42 struct bcm6328_led_priv {
  43         void __iomem *regs;
  44         void __iomem *mode;
  45         uint8_t shift;
  46         bool active_low;
  47 };
  48
  49 static unsigned long bcm6328_led_get_mode(struct bcm6328_led_priv *priv)
  50 {
  51         return ((readl_be(priv->mode) >> priv->shift) & LED_MODE_MASK);
  52 }
  53
  54 static int bcm6328_led_set_mode(struct bcm6328_led_priv *priv, uint8_t mode)
  55 {
  56         clrsetbits_be32(priv->mode, (LED_MODE_MASK << priv->shift),
  57                         (mode << priv->shift));
  58
  59         return 0;
  60 }
  61
  62 static enum led_state_t bcm6328_led_get_state(struct udevice *dev)
  63 {
  64         struct bcm6328_led_priv *priv = dev_get_priv(dev);
  65         enum led_state_t state = LEDST_OFF;
  66
  67         switch (bcm6328_led_get_mode(priv)) {
  68 #ifdef CONFIG_LED_BLINK
  69         case LED_MODE_BLINK:
  70         case LED_MODE_FAST:
  71                 state = LEDST_BLINK;
  72                 break;
  73 #endif
  74         case LED_MODE_OFF:
  75                 state = (priv->active_low ? LEDST_ON : LEDST_OFF);
  76                 break;
  77         case LED_MODE_ON:
  78                 state = (priv->active_low ? LEDST_OFF : LEDST_ON);
  79                 break;
  80         }
  81
  82         return state;
  83 }
  84
  85 static int bcm6328_led_set_state(struct udevice *dev, enum led_state_t state)
  86 {
  87         struct bcm6328_led_priv *priv = dev_get_priv(dev);
  88         unsigned long mode;
  89
  90         switch (state) {
  91 #ifdef CONFIG_LED_BLINK
  92         case LEDST_BLINK:
  93                 mode = LED_MODE_BLINK;
  94                 break;
  95 #endif
  96         case LEDST_OFF:
  97                 mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
  98                 break;
  99         case LEDST_ON:
 100                 mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
 101                 break;
 102         case LEDST_TOGGLE:
 103                 if (bcm6328_led_get_state(dev) == LEDST_OFF)
 104                         return bcm6328_led_set_state(dev, LEDST_ON);
 105                 else
 106                         return bcm6328_led_set_state(dev, LEDST_OFF);
 107                 break;
 108         default:
 109                 return -ENOSYS;
 110         }
 111
 112         return bcm6328_led_set_mode(priv, mode);
 113 }
 114
 115 #ifdef CONFIG_LED_BLINK
 116 static unsigned long bcm6328_blink_delay(int delay)
 117 {
 118         unsigned long bcm6328_delay = delay;
 119
 120         bcm6328_delay += (LED_INIT_FASTINTV_MS / 2);
 121         bcm6328_delay /= LED_INIT_FASTINTV_MS;
 122         bcm6328_delay <<= LED_INIT_FASTINTV_SHIFT;
 123
 124         if (bcm6328_delay > LED_INIT_FASTINTV_MASK)
 125                 return LED_INIT_FASTINTV_MASK;
 126         else
 127                 return bcm6328_delay;
 128 }
 129
 130 static int bcm6328_led_set_period(struct udevice *dev, int period_ms)
 131 {
 132         struct bcm6328_led_priv *priv = dev_get_priv(dev);
 133
 134         clrsetbits_be32(priv->regs + LED_INIT_REG, LED_INIT_FASTINTV_MASK,
 135                         bcm6328_blink_delay(period_ms));
 136
 137         return 0;
 138 }
 139 #endif
 140
 141 static const struct led_ops bcm6328_led_ops = {
 142         .get_state = bcm6328_led_get_state,
 143         .set_state = bcm6328_led_set_state,
 144 #ifdef CONFIG_LED_BLINK
 145         .set_period = bcm6328_led_set_period,
 146 #endif
 147 };
 148
 149 static int bcm6328_led_probe(struct udevice *dev)
 150 {
 151         struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
 152         fdt_addr_t addr;
 153         fdt_size_t size;
 154
 155         /* Top-level LED node */
 156         if (!uc_plat->label) {
 157                 void __iomem *regs;
 158                 u32 set_bits = 0;
 159
 160                 addr = devfdt_get_addr_size_index(dev, 0, &size);
 161                 if (addr == FDT_ADDR_T_NONE)
 162                         return -EINVAL;
 163
 164                 regs = ioremap(addr, size);
 165
 166                 if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
 167                                     "brcm,serial-leds"))
 168                         set_bits |= LED_INIT_SLEDEN_MASK;
 169                 if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
 170                                     "brcm,serial-mux"))
 171                         set_bits |= LED_INIT_SLEDMUX_MASK;
 172                 if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
 173                                     "brcm,serial-clk-low"))
 174                         set_bits |= LED_INIT_SLEDCLKNPOL_MASK;
 175                 if (!fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
 176                                      "brcm,serial-dat-low"))
 177                         set_bits |= LED_INIT_SLEDDATANPOL_MASK;
 178                 if (!fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
 179                                      "brcm,serial-shift-inv"))
 180                         set_bits |= LED_INIT_SLEDSHIFTDIR_MASK;
 181
 182                 clrsetbits_be32(regs + LED_INIT_REG, ~0, set_bits);
 183         } else {
 184                 struct bcm6328_led_priv *priv = dev_get_priv(dev);
 185                 unsigned int pin;
 186
 187                 addr = devfdt_get_addr_size_index(dev_get_parent(dev), 0,
 188                                                   &size);
 189                 if (addr == FDT_ADDR_T_NONE)
 190                         return -EINVAL;
 191
 192                 pin = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), "reg",
 193                                       LEDS_MAX);
 194                 if (pin >= LEDS_MAX)
 195                         return -EINVAL;
 196
 197                 priv->regs = ioremap(addr, size);
 198                 if (pin < 8) {
 199                         /* LEDs 0-7 (bits 47:32) */
 200                         priv->mode = priv->regs + LED_MODE_REG_HI;
 201                         priv->shift = (pin << 1);
 202                 } else {
 203                         /* LEDs 8-23 (bits 31:0) */
 204                         priv->mode = priv->regs + LED_MODE_REG_LO;
 205                         priv->shift = ((pin - 8) << 1);
 206                 }
 207
 208                 if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
 209                                     "active-low"))
 210                         priv->active_low = true;
 211         }
 212
 213         return 0;
 214 }
 215
 216 static int bcm6328_led_bind(struct udevice *parent)
 217 {
 218         const void *blob = gd->fdt_blob;
 219         int node;
 220
 221         for (node = fdt_first_subnode(blob, dev_of_offset(parent));
 222              node > 0;
 223              node = fdt_next_subnode(blob, node)) {
 224                 struct led_uc_plat *uc_plat;
 225                 struct udevice *dev;
 226                 const char *label;
 227                 int ret;
 228
 229                 label = fdt_getprop(blob, node, "label", NULL);
 230                 if (!label) {
 231                         debug("%s: node %s has no label\n", __func__,
 232                               fdt_get_name(blob, node, NULL));
 233                         return -EINVAL;
 234                 }
 235
 236                 ret = device_bind_driver_to_node(parent, "bcm6328-led",
 237                                                  fdt_get_name(blob, node, NULL),
 238                                                  offset_to_ofnode(node), &dev);
 239                 if (ret)
 240                         return ret;
 241
 242                 uc_plat = dev_get_uclass_platdata(dev);
 243                 uc_plat->label = label;
 244         }
 245
 246         return 0;
 247 }
 248
 249 static const struct udevice_id bcm6328_led_ids[] = {
 250         { .compatible = "brcm,bcm6328-leds" },
 251         { /* sentinel */ }
 252 };
 253
 254 U_BOOT_DRIVER(bcm6328_led) = {
 255         .name = "bcm6328-led",
 256         .id = UCLASS_LED,
 257         .of_match = bcm6328_led_ids,
 258         .ops = &bcm6328_led_ops,
 259         .bind = bcm6328_led_bind,
 260         .probe = bcm6328_led_probe,
 261         .priv_auto_alloc_size = sizeof(struct bcm6328_led_priv),
 262 };