[U-Boot] [PATCH 1/8] led: add initial support for bcm6858
Philippe Reynes
philippe.reynes at softathome.com
Thu Mar 21 13:28:47 UTC 2019
The driver add the support of the led IP on bcm6858.
This led IP can drive up to 32 leds, and can handle
blinking.
Signed-off-by: Philippe Reynes <philippe.reynes at softathome.com>
---
doc/device-tree-bindings/leds/leds-bcm6858.txt | 51 +++++
drivers/led/Kconfig | 7 +
drivers/led/Makefile | 1 +
drivers/led/led_bcm6858.c | 248 +++++++++++++++++++++++++
4 files changed, 307 insertions(+)
create mode 100644 doc/device-tree-bindings/leds/leds-bcm6858.txt
create mode 100644 drivers/led/led_bcm6858.c
diff --git a/doc/device-tree-bindings/leds/leds-bcm6858.txt b/doc/device-tree-bindings/leds/leds-bcm6858.txt
new file mode 100644
index 0000000..ea2fe23
--- /dev/null
+++ b/doc/device-tree-bindings/leds/leds-bcm6858.txt
@@ -0,0 +1,51 @@
+LEDs connected to Broadcom BCM6858 controller
+
+This controller is present on BCM6858, BCM6328, BCM6362 and BCM63268.
+In these SoCs it's possible to control LEDs both as GPIOs or by hardware.
+
+Required properties:
+ - compatible : should be "brcm,bcm6858-leds".
+ - #address-cells : must be 1.
+ - #size-cells : must be 0.
+ - reg : BCM6858 LED controller address and size.
+
+Optional properties:
+ - brcm,serial-led-msb-first : Boolean, msb data come out first on serial data pin
+ Default : false
+ - brcm,serial-led-en-pol : Boolean, serial led polarity (true => active high)
+ Default : false
+ - brcm,serial-led-clk-pol : Boolean, serial clock polarity (true => active high)
+ Default : false
+ - brcm,serial-led-data-ppol : Boolean, serial data polarity (true => active high)
+ Default : false
+ - brcm,serial-shift-inv : Boolean, led test mode
+ Default : false
+
+Each LED is represented as a sub-node of the brcm,bcm6858-leds device.
+
+LED sub-node required properties:
+ - reg : LED pin number (only LEDs 0 to 32 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:
+BCM6328 with 2 GPIO LEDs
+ leds0: led-controller at ff800800 {
+ compatible = "brcm,bcm6858-leds";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x0 0xff800800 0x0 0xe4>;
+
+ led at 2 {
+ reg = <2>;
+ label = "green:inet";
+ };
+
+ led at 5 {
+ reg = <5>;
+ label = "red:alarm";
+ };
+ };
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
index 5da5c4a..4c8582d 100644
--- a/drivers/led/Kconfig
+++ b/drivers/led/Kconfig
@@ -28,6 +28,13 @@ config LED_BCM6358
LED HW controller accessed via MMIO registers.
HW has no blinking capabilities and up to 32 LEDs can be controlled.
+config LED_BCM6858
+ bool "LED Support for BCM6858"
+ depends on LED && ARCH_BCM6858
+ help
+ This option enables support for LEDs connected to the BCM6858
+ HW has blinking capabilities and up to 32 LEDs can be controlled.
+
config LED_BLINK
bool "Support LED blinking"
depends on LED
diff --git a/drivers/led/Makefile b/drivers/led/Makefile
index 160a8f3..3654dd3 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_LED_BCM6358) += led_bcm6358.o
+obj-$(CONFIG_LED_BCM6858) += led_bcm6858.o
obj-$(CONFIG_$(SPL_)LED_GPIO) += led_gpio.o
diff --git a/drivers/led/led_bcm6858.c b/drivers/led/led_bcm6858.c
new file mode 100644
index 0000000..c0f9b90
--- /dev/null
+++ b/drivers/led/led_bcm6858.c
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Philippe Reynes <philippe.reynes at softathome.com>
+ *
+ * based on:
+ * drivers/led/led_bcm6328.c
+ * drivers/led/led_bcm6358.c
+ */
+
+#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 Controller Global settings register */
+#define LED_CTRL_REG 0x00
+#define LED_CTRL_MASK 0x1f
+#define LED_CTRL_LED_TEST_MODE BIT(0)
+#define LED_CTRL_SERIAL_LED_DATA_PPOL BIT(1)
+#define LED_CTRL_SERIAL_LED_CLK_POL BIT(2)
+#define LED_CTRL_SERIAL_LED_EN_POL BIT(3)
+#define LED_CTRL_SERIAL_LED_MSB_FIRST BIT(4)
+
+/* LED Controller IP LED source select register */
+#define LED_HW_LED_EN_REG 0x08
+/* LED Flash control register0 */
+#define LED_FLASH_RATE_CONTROL_REG0 0x10
+/* Soft LED input register */
+#define LED_SW_LED_IP_REG 0xb8
+/* Soft LED input polarity register */
+#define LED_SW_LED_IP_PPOL_REG 0xbc
+
+struct bcm6858_led_priv {
+ void __iomem *regs;
+ u8 pin;
+};
+
+#ifdef CONFIG_LED_BLINK
+/*
+ * The value for flash rate are:
+ * 0 : no blinking
+ * 1 : rate is 25 Hz => 40 ms (period)
+ * 2 : rate is 12.5 Hz => 80 ms (period)
+ * 3 : rate is 6.25 Hz => 160 ms (period)
+ * 4 : rate is 3.125 Hz => 320 ms (period)
+ * 5 : rate is 1.5625 Hz => 640 ms (period)
+ * 6 : rate is 0.7815 Hz => 1280 ms (period)
+ * 7 : rate is 0.390625 Hz => 2560 ms (period)
+ */
+static u32 bcm6858_flash_rate[8] = { 0, 40, 80, 160, 320, 640, 1280, 2560 };
+
+static u32 bcm6858_flash_rate_value(int period_ms)
+{
+ unsigned long value = 7;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(bcm6858_flash_rate); i++) {
+ if (period_ms <= bcm6858_flash_rate[i]) {
+ value = i;
+ break;
+ }
+ }
+
+ return value;
+}
+
+static int bcm6858_led_set_period(struct udevice *dev, int period_ms)
+{
+ struct bcm6858_led_priv *priv = dev_get_priv(dev);
+ u32 offset, shift, mask, value;
+
+ offset = (priv->pin / 8) * 4;
+ shift = (priv->pin % 8) * 4;
+ mask = 0x7 << shift;
+ value = bcm6858_flash_rate_value(period_ms) << shift;
+
+ clrbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, mask);
+ setbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, value);
+
+ return 0;
+}
+#endif
+
+static enum led_state_t bcm6858_led_get_state(struct udevice *dev)
+{
+ struct bcm6858_led_priv *priv = dev_get_priv(dev);
+ enum led_state_t state = LEDST_OFF;
+ u32 sw_led_ip;
+
+ sw_led_ip = readl(priv->regs + LED_SW_LED_IP_REG);
+ if (sw_led_ip & (1 << priv->pin))
+ state = LEDST_ON;
+
+ return state;
+}
+
+static int bcm6858_led_set_state(struct udevice *dev, enum led_state_t state)
+{
+ struct bcm6858_led_priv *priv = dev_get_priv(dev);
+
+ switch (state) {
+ case LEDST_OFF:
+ clrbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
+#ifdef CONFIG_LED_BLINK
+ bcm6858_led_set_period(dev, 0);
+#endif
+ break;
+ case LEDST_ON:
+ setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
+#ifdef CONFIG_LED_BLINK
+ bcm6858_led_set_period(dev, 0);
+#endif
+ break;
+ case LEDST_TOGGLE:
+ if (bcm6858_led_get_state(dev) == LEDST_OFF)
+ return bcm6858_led_set_state(dev, LEDST_ON);
+ else
+ return bcm6858_led_set_state(dev, LEDST_OFF);
+ break;
+#ifdef CONFIG_LED_BLINK
+ case LEDST_BLINK:
+ setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
+ break;
+#endif
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct led_ops bcm6858_led_ops = {
+ .get_state = bcm6858_led_get_state,
+ .set_state = bcm6858_led_set_state,
+#ifdef CONFIG_LED_BLINK
+ .set_period = bcm6858_led_set_period,
+#endif
+};
+
+static int bcm6858_led_probe(struct udevice *dev)
+{
+ struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
+
+ /* Top-level LED node */
+ if (!uc_plat->label) {
+ void __iomem *regs;
+ u32 set_bits = 0;
+
+ regs = dev_remap_addr(dev);
+ if (!regs)
+ return -EINVAL;
+
+ if (dev_read_bool(dev, "brcm,serial-led-msb-first"))
+ set_bits |= LED_CTRL_SERIAL_LED_MSB_FIRST;
+ if (dev_read_bool(dev, "brcm,serial-led-en-pol"))
+ set_bits |= LED_CTRL_SERIAL_LED_EN_POL;
+ if (dev_read_bool(dev, "brcm,serial-led-clk-pol"))
+ set_bits |= LED_CTRL_SERIAL_LED_CLK_POL;
+ if (dev_read_bool(dev, "brcm,serial-led-data-ppol"))
+ set_bits |= LED_CTRL_SERIAL_LED_DATA_PPOL;
+ if (dev_read_bool(dev, "brcm,led-test-mode"))
+ set_bits |= LED_CTRL_LED_TEST_MODE;
+
+ clrsetbits_32(regs + LED_CTRL_REG, ~0, set_bits);
+ } else {
+ struct bcm6858_led_priv *priv = dev_get_priv(dev);
+ void __iomem *regs;
+ unsigned int pin;
+
+ regs = dev_remap_addr(dev_get_parent(dev));
+ if (!regs)
+ return -EINVAL;
+
+ pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
+ if (pin >= LEDS_MAX)
+ return -EINVAL;
+
+ priv->regs = regs;
+ priv->pin = pin;
+
+ /* this led is managed by software */
+ clrbits_32(regs + LED_HW_LED_EN_REG, 1 << pin);
+
+ /* configure the polarity */
+ if (dev_read_bool(dev, "active-low"))
+ clrbits_32(regs + LED_SW_LED_IP_PPOL_REG, 1 << pin);
+ else
+ setbits_32(regs + LED_SW_LED_IP_PPOL_REG, 1 << pin);
+ }
+
+ return 0;
+}
+
+static int bcm6858_led_bind(struct udevice *parent)
+{
+ ofnode node;
+
+ dev_for_each_subnode(node, parent) {
+ struct led_uc_plat *uc_plat;
+ struct udevice *dev;
+ const char *label;
+ int ret;
+
+ label = ofnode_read_string(node, "label");
+ if (!label) {
+ debug("%s: node %s has no label\n", __func__,
+ ofnode_get_name(node));
+ return -EINVAL;
+ }
+
+ ret = device_bind_driver_to_node(parent, "bcm6858-led",
+ ofnode_get_name(node),
+ node, &dev);
+ if (ret)
+ return ret;
+
+ uc_plat = dev_get_uclass_platdata(dev);
+ uc_plat->label = label;
+ }
+
+ return 0;
+}
+
+static const struct udevice_id bcm6858_led_ids[] = {
+ { .compatible = "brcm,bcm6858-leds" },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(bcm6858_led) = {
+ .name = "bcm6858-led",
+ .id = UCLASS_LED,
+ .of_match = bcm6858_led_ids,
+ .bind = bcm6858_led_bind,
+ .probe = bcm6858_led_probe,
+ .priv_auto_alloc_size = sizeof(struct bcm6858_led_priv),
+ .ops = &bcm6858_led_ops,
+};
--
2.7.4
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