dm: led: add BCM6328 led driver
This driver is a simplified version of linux/drivers/leds/leds-bcm6328.c,
simplified to remove HW leds and blink fallbacks.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/device-tree-bindings/leds/leds-bcm6328.txt b/doc/device-tree-bindings/leds/leds-bcm6328.txt
new file mode 100644
index 0000000..7f5597b
--- /dev/null
+++ b/doc/device-tree-bindings/leds/leds-bcm6328.txt
@@ -0,0 +1,106 @@
+LEDs connected to Broadcom BCM6328 controller
+
+This controller is present on BCM6318, BCM6328, BCM6362 and BCM63268.
+In these SoCs it's possible to control LEDs both as GPIOs or by hardware.
+However, on some devices there are Serial LEDs (LEDs connected to a 74x164
+controller), which can either be controlled by software (exporting the 74x164
+as spi-gpio. See Documentation/devicetree/bindings/gpio/gpio-74x164.txt), or
+by hardware using this driver.
+Some of these Serial LEDs are hardware controlled (e.g. ethernet LEDs) and
+exporting the 74x164 as spi-gpio prevents those LEDs to be hardware
+controlled, so the only chance to keep them working is by using this driver.
+
+Required properties:
+ - compatible : should be "brcm,bcm6328-leds".
+ - #address-cells : must be 1.
+ - #size-cells : must be 0.
+ - reg : BCM6328 LED controller address and size.
+
+Optional properties:
+ - brcm,serial-leds : Boolean, enables Serial LEDs.
+ Default : false
+ - brcm,serial-mux : Boolean, enables Serial LEDs multiplexing.
+ Default : false
+ - brcm,serial-clk-low : Boolean, makes clock signal active low.
+ Default : false
+ - brcm,serial-dat-low : Boolean, makes data signal active low.
+ Default : false
+ - brcm,serial-shift-inv : Boolean, inverts Serial LEDs shift direction.
+ Default : false
+
+Each LED is represented as a sub-node of the brcm,bcm6328-leds device.
+
+LED sub-node required properties:
+ - reg : LED pin number (only LEDs 0 to 23 are valid).
+
+LED sub-node optional properties:
+ - label : see Documentation/devicetree/bindings/leds/common.txt
+ - active-low : Boolean, makes LED active low.
+ Default : false
+
+Examples:
+Scenario 1 : BCM6328 with 4 GPIO LEDs
+ leds0: led-controller@10000800 {
+ compatible = "brcm,bcm6328-leds";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x10000800 0x24>;
+
+ alarm_red@2 {
+ reg = <2>;
+ active-low;
+ label = "red:alarm";
+ };
+ inet_green@3 {
+ reg = <3>;
+ active-low;
+ label = "green:inet";
+ };
+ power_green@4 {
+ reg = <4>;
+ active-low;
+ label = "green:power";
+ };
+ };
+
+Scenario 2 : BCM63268 with Serial LEDs
+ leds0: led-controller@10001900 {
+ compatible = "brcm,bcm6328-leds";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x10001900 0x24>;
+ brcm,serial-leds;
+ brcm,serial-dat-low;
+ brcm,serial-shift-inv;
+
+ inet_red@2 {
+ reg = <2>;
+ active-low;
+ label = "red:inet";
+ };
+ dsl_green@3 {
+ reg = <3>;
+ active-low;
+ label = "green:dsl";
+ };
+ usb_green@4 {
+ reg = <4>;
+ active-low;
+ label = "green:usb";
+ };
+ wps_green@7 {
+ reg = <7>;
+ active-low;
+ label = "green:wps";
+ };
+ inet_green@8 {
+ reg = <8>;
+ active-low;
+ label = "green:inet";
+ };
+ power_green@20 {
+ reg = <20>;
+ active-low;
+ label = "green:power";
+ };
+ };
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
index 309372a..dc19f4f 100644
--- a/drivers/led/Kconfig
+++ b/drivers/led/Kconfig
@@ -9,6 +9,17 @@
can provide access to board-specific LEDs. Use of the device tree
for configuration is encouraged.
+config LED_BCM6328
+ bool "LED Support for BCM6328"
+ depends on LED && ARCH_BMIPS
+ help
+ This option enables support for LEDs connected to the BCM6328
+ LED HW controller accessed via MMIO registers.
+ HW blinking is supported and up to 24 LEDs can be controlled.
+ All LEDs can blink at the same time but the delay is shared, which
+ means that if one LED is set to blink at 100ms and then a different
+ LED is set to blink at 200ms, both will blink at 200ms.
+
config LED_BLINK
bool "Support LED blinking"
depends on LED
diff --git a/drivers/led/Makefile b/drivers/led/Makefile
index 02367fd..d371ed5 100644
--- a/drivers/led/Makefile
+++ b/drivers/led/Makefile
@@ -6,4 +6,5 @@
#
obj-y += led-uclass.o
+obj-$(CONFIG_LED_BCM6328) += led_bcm6328.o
obj-$(CONFIG_$(SPL_)LED_GPIO) += led_gpio.o
diff --git a/drivers/led/led_bcm6328.c b/drivers/led/led_bcm6328.c
new file mode 100644
index 0000000..ef8c6a7
--- /dev/null
+++ b/drivers/led/led_bcm6328.c
@@ -0,0 +1,262 @@
+/*
+ * 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 24
+
+/* LED Init register */
+#define LED_INIT_REG 0x00
+#define LED_INIT_FASTINTV_MS 20
+#define LED_INIT_FASTINTV_SHIFT 6
+#define LED_INIT_FASTINTV_MASK (0x3f << LED_INIT_FASTINTV_SHIFT)
+#define LED_INIT_SLEDEN_SHIFT 12
+#define LED_INIT_SLEDEN_MASK (1 << LED_INIT_SLEDEN_SHIFT)
+#define LED_INIT_SLEDMUX_SHIFT 13
+#define LED_INIT_SLEDMUX_MASK (1 << LED_INIT_SLEDMUX_SHIFT)
+#define LED_INIT_SLEDCLKNPOL_SHIFT 14
+#define LED_INIT_SLEDCLKNPOL_MASK (1 << LED_INIT_SLEDCLKNPOL_SHIFT)
+#define LED_INIT_SLEDDATAPPOL_SHIFT 15
+#define LED_INIT_SLEDDATANPOL_MASK (1 << LED_INIT_SLEDDATAPPOL_SHIFT)
+#define LED_INIT_SLEDSHIFTDIR_SHIFT 16
+#define LED_INIT_SLEDSHIFTDIR_MASK (1 << LED_INIT_SLEDSHIFTDIR_SHIFT)
+
+/* LED Mode registers */
+#define LED_MODE_REG_HI 0x04
+#define LED_MODE_REG_LO 0x08
+#define LED_MODE_ON 0
+#define LED_MODE_FAST 1
+#define LED_MODE_BLINK 2
+#define LED_MODE_OFF 3
+#define LED_MODE_MASK 0x3
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct bcm6328_led_priv {
+ void __iomem *regs;
+ void __iomem *mode;
+ uint8_t shift;
+ bool active_low;
+};
+
+static unsigned long bcm6328_led_get_mode(struct bcm6328_led_priv *priv)
+{
+ return ((readl_be(priv->mode) >> priv->shift) & LED_MODE_MASK);
+}
+
+static int bcm6328_led_set_mode(struct bcm6328_led_priv *priv, uint8_t mode)
+{
+ clrsetbits_be32(priv->mode, (LED_MODE_MASK << priv->shift),
+ (mode << priv->shift));
+
+ return 0;
+}
+
+static enum led_state_t bcm6328_led_get_state(struct udevice *dev)
+{
+ struct bcm6328_led_priv *priv = dev_get_priv(dev);
+ enum led_state_t state = LEDST_OFF;
+
+ switch (bcm6328_led_get_mode(priv)) {
+#ifdef CONFIG_LED_BLINK
+ case LED_MODE_BLINK:
+ case LED_MODE_FAST:
+ state = LEDST_BLINK;
+ break;
+#endif
+ 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 bcm6328_led_set_state(struct udevice *dev, enum led_state_t state)
+{
+ struct bcm6328_led_priv *priv = dev_get_priv(dev);
+ unsigned long mode;
+
+ switch (state) {
+#ifdef CONFIG_LED_BLINK
+ case LEDST_BLINK:
+ mode = LED_MODE_BLINK;
+ break;
+#endif
+ 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 (bcm6328_led_get_state(dev) == LEDST_OFF)
+ return bcm6328_led_set_state(dev, LEDST_ON);
+ else
+ return bcm6328_led_set_state(dev, LEDST_OFF);
+ break;
+ default:
+ return -ENOSYS;
+ }
+
+ return bcm6328_led_set_mode(priv, mode);
+}
+
+#ifdef CONFIG_LED_BLINK
+static unsigned long bcm6328_blink_delay(int delay)
+{
+ unsigned long bcm6328_delay = delay;
+
+ bcm6328_delay += (LED_INIT_FASTINTV_MS / 2);
+ bcm6328_delay /= LED_INIT_FASTINTV_MS;
+ bcm6328_delay <<= LED_INIT_FASTINTV_SHIFT;
+
+ if (bcm6328_delay > LED_INIT_FASTINTV_MASK)
+ return LED_INIT_FASTINTV_MASK;
+ else
+ return bcm6328_delay;
+}
+
+static int bcm6328_led_set_period(struct udevice *dev, int period_ms)
+{
+ struct bcm6328_led_priv *priv = dev_get_priv(dev);
+
+ clrsetbits_be32(priv->regs + LED_INIT_REG, LED_INIT_FASTINTV_MASK,
+ bcm6328_blink_delay(period_ms));
+
+ return 0;
+}
+#endif
+
+static const struct led_ops bcm6328_led_ops = {
+ .get_state = bcm6328_led_get_state,
+ .set_state = bcm6328_led_set_state,
+#ifdef CONFIG_LED_BLINK
+ .set_period = bcm6328_led_set_period,
+#endif
+};
+
+static int bcm6328_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;
+ 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,serial-leds"))
+ set_bits |= LED_INIT_SLEDEN_MASK;
+ if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
+ "brcm,serial-mux"))
+ set_bits |= LED_INIT_SLEDMUX_MASK;
+ if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
+ "brcm,serial-clk-low"))
+ set_bits |= LED_INIT_SLEDCLKNPOL_MASK;
+ if (!fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
+ "brcm,serial-dat-low"))
+ set_bits |= LED_INIT_SLEDDATANPOL_MASK;
+ if (!fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
+ "brcm,serial-shift-inv"))
+ set_bits |= LED_INIT_SLEDSHIFTDIR_MASK;
+
+ clrsetbits_be32(regs + LED_INIT_REG, ~0, set_bits);
+ } else {
+ struct bcm6328_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);
+ if (pin < 8) {
+ /* LEDs 0-7 (bits 47:32) */
+ priv->mode = priv->regs + LED_MODE_REG_HI;
+ priv->shift = (pin << 1);
+ } else {
+ /* LEDs 8-23 (bits 31:0) */
+ priv->mode = priv->regs + LED_MODE_REG_LO;
+ priv->shift = ((pin - 8) << 1);
+ }
+
+ if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
+ "active-low"))
+ priv->active_low = true;
+ }
+
+ return 0;
+}
+
+static int bcm6328_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, "bcm6328-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 bcm6328_led_ids[] = {
+ { .compatible = "brcm,bcm6328-leds" },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(bcm6328_led) = {
+ .name = "bcm6328-led",
+ .id = UCLASS_LED,
+ .of_match = bcm6328_led_ids,
+ .ops = &bcm6328_led_ops,
+ .bind = bcm6328_led_bind,
+ .probe = bcm6328_led_probe,
+ .priv_auto_alloc_size = sizeof(struct bcm6328_led_priv),
+};