--- /dev/null
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <led.h>
+#include <asm/io.h>
+#include <dm/lists.h>
+
+#define LEDS_MAX 32
+#define LEDS_WAIT 100
+
+/* LED Mode register */
+#define LED_MODE_REG 0x0
+#define LED_MODE_OFF 0
+#define LED_MODE_ON 1
+#define LED_MODE_MASK 1
+
+/* LED Control register */
+#define LED_CTRL_REG 0x4
+#define LED_CTRL_CLK_MASK 0x3
+#define LED_CTRL_CLK_1 0
+#define LED_CTRL_CLK_2 1
+#define LED_CTRL_CLK_4 2
+#define LED_CTRL_CLK_8 3
+#define LED_CTRL_POL_SHIFT 2
+#define LED_CTRL_POL_MASK (1 << LED_CTRL_POL_SHIFT)
+#define LED_CTRL_BUSY_SHIFT 3
+#define LED_CTRL_BUSY_MASK (1 << LED_CTRL_BUSY_SHIFT)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct bcm6358_led_priv {
+ void __iomem *regs;
+ uint8_t pin;
+ bool active_low;
+};
+
+static void bcm6358_led_busy(void __iomem *regs)
+{
+ while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK)
+ udelay(LEDS_WAIT);
+}
+
+static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv)
+{
+ bcm6358_led_busy(priv->regs);
+
+ return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) &
+ LED_MODE_MASK;
+}
+
+static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode)
+{
+ bcm6358_led_busy(priv->regs);
+
+ clrsetbits_be32(priv->regs + LED_MODE_REG,
+ (LED_MODE_MASK << priv->pin),
+ (mode << priv->pin));
+
+ return 0;
+}
+
+static enum led_state_t bcm6358_led_get_state(struct udevice *dev)
+{
+ struct bcm6358_led_priv *priv = dev_get_priv(dev);
+ enum led_state_t state = LEDST_OFF;
+
+ switch (bcm6358_led_get_mode(priv)) {
+ case LED_MODE_OFF:
+ state = (priv->active_low ? LEDST_ON : LEDST_OFF);
+ break;
+ case LED_MODE_ON:
+ state = (priv->active_low ? LEDST_OFF : LEDST_ON);
+ break;
+ }
+
+ return state;
+}
+
+static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state)
+{
+ struct bcm6358_led_priv *priv = dev_get_priv(dev);
+ unsigned long mode;
+
+ switch (state) {
+ case LEDST_OFF:
+ mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
+ break;
+ case LEDST_ON:
+ mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
+ break;
+ case LEDST_TOGGLE:
+ if (bcm6358_led_get_state(dev) == LEDST_OFF)
+ return bcm6358_led_set_state(dev, LEDST_ON);
+ else
+ return bcm6358_led_set_state(dev, LEDST_OFF);
+ break;
+ default:
+ return -ENOSYS;
+ }
+
+ return bcm6358_led_set_mode(priv, mode);
+}
+
+static const struct led_ops bcm6358_led_ops = {
+ .get_state = bcm6358_led_get_state,
+ .set_state = bcm6358_led_set_state,
+};
+
+static int bcm6358_led_probe(struct udevice *dev)
+{
+ struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
+ fdt_addr_t addr;
+ fdt_size_t size;
+
+ /* Top-level LED node */
+ if (!uc_plat->label) {
+ void __iomem *regs;
+ unsigned int clk_div;
+ u32 set_bits = 0;
+
+ addr = dev_get_addr_size_index(dev, 0, &size);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ regs = ioremap(addr, size);
+
+ if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
+ "brcm,clk-dat-low"))
+ set_bits |= LED_CTRL_POL_MASK;
+ clk_div = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
+ "brcm,clk-div", LED_CTRL_CLK_1);
+ switch (clk_div) {
+ case 8:
+ set_bits |= LED_CTRL_CLK_8;
+ break;
+ case 4:
+ set_bits |= LED_CTRL_CLK_4;
+ break;
+ case 2:
+ set_bits |= LED_CTRL_CLK_2;
+ break;
+ default:
+ set_bits |= LED_CTRL_CLK_1;
+ break;
+ }
+
+ bcm6358_led_busy(regs);
+ clrsetbits_be32(regs + LED_CTRL_REG,
+ LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
+ set_bits);
+ } else {
+ struct bcm6358_led_priv *priv = dev_get_priv(dev);
+ unsigned int pin;
+
+ addr = dev_get_addr_size_index(dev_get_parent(dev), 0, &size);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ pin = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), "reg",
+ LEDS_MAX);
+ if (pin >= LEDS_MAX)
+ return -EINVAL;
+
+ priv->regs = ioremap(addr, size);
+ priv->pin = pin;
+
+ if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
+ "active-low"))
+ priv->active_low = true;
+ }
+
+ return 0;
+}
+
+static int bcm6358_led_bind(struct udevice *parent)
+{
+ const void *blob = gd->fdt_blob;
+ int node;
+
+ for (node = fdt_first_subnode(blob, dev_of_offset(parent));
+ node > 0;
+ node = fdt_next_subnode(blob, node)) {
+ struct led_uc_plat *uc_plat;
+ struct udevice *dev;
+ const char *label;
+ int ret;
+
+ label = fdt_getprop(blob, node, "label", NULL);
+ if (!label) {
+ debug("%s: node %s has no label\n", __func__,
+ fdt_get_name(blob, node, NULL));
+ return -EINVAL;
+ }
+
+ ret = device_bind_driver_to_node(parent, "bcm6358-led",
+ fdt_get_name(blob, node, NULL),
+ node, &dev);
+ if (ret)
+ return ret;
+
+ uc_plat = dev_get_uclass_platdata(dev);
+ uc_plat->label = label;
+ }
+
+ return 0;
+}
+
+static const struct udevice_id bcm6358_led_ids[] = {
+ { .compatible = "brcm,bcm6358-leds" },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(bcm6358_led) = {
+ .name = "bcm6358-led",
+ .id = UCLASS_LED,
+ .of_match = bcm6358_led_ids,
+ .bind = bcm6358_led_bind,
+ .probe = bcm6358_led_probe,
+ .priv_auto_alloc_size = sizeof(struct bcm6358_led_priv),
+ .ops = &bcm6358_led_ops,
+};
projects / u-boot / blobdiff