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dm: led: add BCM6358 led driver
This driver is a simplified version of linux/drivers/leds/leds-bcm6358.c Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Álvaro Fernández Rojas
Daniel Schwierzeck
parent
09e2a57150
commit
632889cfe5
141
doc/device-tree-bindings/leds/leds-bcm6358.txt
Normal file
141
doc/device-tree-bindings/leds/leds-bcm6358.txt
Normal file
@ -0,0 +1,141 @@
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LEDs connected to Broadcom BCM6358 controller
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This controller is present on BCM6358 and BCM6368.
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In these SoCs there are Serial LEDs (LEDs connected to a 74x164 controller),
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which can either be controlled by software (exporting the 74x164 as spi-gpio.
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See Documentation/devicetree/bindings/gpio/gpio-74x164.txt), or
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by hardware using this driver.
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Required properties:
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- compatible : should be "brcm,bcm6358-leds".
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- #address-cells : must be 1.
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- #size-cells : must be 0.
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- reg : BCM6358 LED controller address and size.
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Optional properties:
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- brcm,clk-div : SCK signal divider. Possible values are 1, 2, 4 and 8.
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Default : 1
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- brcm,clk-dat-low : Boolean, makes clock and data signals active low.
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Default : false
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Each LED is represented as a sub-node of the brcm,bcm6358-leds device.
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LED sub-node required properties:
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- reg : LED pin number (only LEDs 0 to 31 are valid).
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LED sub-node optional properties:
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- label : see Documentation/devicetree/bindings/leds/common.txt
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- active-low : Boolean, makes LED active low.
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Default : false
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Examples:
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Scenario 1 : BCM6358
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leds0: led-controller@fffe00d0 {
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compatible = "brcm,bcm6358-leds";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0xfffe00d0 0x8>;
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alarm_white {
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reg = <0>;
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active-low;
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label = "white:alarm";
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};
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tv_white {
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reg = <2>;
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active-low;
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label = "white:tv";
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};
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tel_white {
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reg = <3>;
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active-low;
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label = "white:tel";
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};
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adsl_white {
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reg = <4>;
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active-low;
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label = "white:adsl";
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};
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};
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Scenario 2 : BCM6368
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leds0: led-controller@100000d0 {
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compatible = "brcm,bcm6358-leds";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x100000d0 0x8>;
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brcm,pol-low;
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brcm,clk-div = <4>;
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power_red {
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reg = <0>;
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active-low;
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label = "red:power";
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};
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power_green {
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reg = <1>;
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active-low;
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label = "green:power";
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default-state = "on";
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};
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power_blue {
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reg = <2>;
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label = "blue:power";
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};
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broadband_red {
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reg = <3>;
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active-low;
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label = "red:broadband";
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};
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broadband_green {
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reg = <4>;
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label = "green:broadband";
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};
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broadband_blue {
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reg = <5>;
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active-low;
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label = "blue:broadband";
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};
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wireless_red {
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reg = <6>;
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active-low;
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label = "red:wireless";
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};
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wireless_green {
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reg = <7>;
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active-low;
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label = "green:wireless";
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};
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wireless_blue {
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reg = <8>;
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label = "blue:wireless";
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};
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phone_red {
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reg = <9>;
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active-low;
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label = "red:phone";
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};
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phone_green {
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reg = <10>;
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active-low;
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label = "green:phone";
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};
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phone_blue {
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reg = <11>;
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label = "blue:phone";
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};
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upgrading_red {
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reg = <12>;
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active-low;
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label = "red:upgrading";
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};
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upgrading_green {
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reg = <13>;
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active-low;
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label = "green:upgrading";
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};
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upgrading_blue {
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reg = <14>;
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label = "blue:upgrading";
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};
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};
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@ -20,6 +20,14 @@ config LED_BCM6328
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means that if one LED is set to blink at 100ms and then a different
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LED is set to blink at 200ms, both will blink at 200ms.
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config LED_BCM6358
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bool "LED Support for BCM6358"
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depends on LED && ARCH_BMIPS
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help
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This option enables support for LEDs connected to the BCM6358
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LED HW controller accessed via MMIO registers.
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HW has no blinking capabilities and up to 32 LEDs can be controlled.
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config LED_BLINK
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bool "Support LED blinking"
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depends on LED
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@ -7,4 +7,5 @@
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obj-y += led-uclass.o
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obj-$(CONFIG_LED_BCM6328) += led_bcm6328.o
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obj-$(CONFIG_LED_BCM6358) += led_bcm6358.o
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obj-$(CONFIG_$(SPL_)LED_GPIO) += led_gpio.o
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227
drivers/led/led_bcm6358.c
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227
drivers/led/led_bcm6358.c
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@ -0,0 +1,227 @@
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/*
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* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <led.h>
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#include <asm/io.h>
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#include <dm/lists.h>
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#define LEDS_MAX 32
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#define LEDS_WAIT 100
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/* LED Mode register */
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#define LED_MODE_REG 0x0
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#define LED_MODE_OFF 0
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#define LED_MODE_ON 1
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#define LED_MODE_MASK 1
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/* LED Control register */
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#define LED_CTRL_REG 0x4
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#define LED_CTRL_CLK_MASK 0x3
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#define LED_CTRL_CLK_1 0
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#define LED_CTRL_CLK_2 1
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#define LED_CTRL_CLK_4 2
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#define LED_CTRL_CLK_8 3
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#define LED_CTRL_POL_SHIFT 2
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#define LED_CTRL_POL_MASK (1 << LED_CTRL_POL_SHIFT)
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#define LED_CTRL_BUSY_SHIFT 3
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#define LED_CTRL_BUSY_MASK (1 << LED_CTRL_BUSY_SHIFT)
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DECLARE_GLOBAL_DATA_PTR;
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struct bcm6358_led_priv {
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void __iomem *regs;
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uint8_t pin;
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bool active_low;
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};
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static void bcm6358_led_busy(void __iomem *regs)
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{
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while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK)
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udelay(LEDS_WAIT);
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}
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static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv)
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{
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bcm6358_led_busy(priv->regs);
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return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) &
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LED_MODE_MASK;
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}
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static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode)
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{
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bcm6358_led_busy(priv->regs);
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clrsetbits_be32(priv->regs + LED_MODE_REG,
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(LED_MODE_MASK << priv->pin),
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(mode << priv->pin));
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return 0;
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}
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static enum led_state_t bcm6358_led_get_state(struct udevice *dev)
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{
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struct bcm6358_led_priv *priv = dev_get_priv(dev);
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enum led_state_t state = LEDST_OFF;
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switch (bcm6358_led_get_mode(priv)) {
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case LED_MODE_OFF:
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state = (priv->active_low ? LEDST_ON : LEDST_OFF);
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break;
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case LED_MODE_ON:
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state = (priv->active_low ? LEDST_OFF : LEDST_ON);
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break;
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}
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return state;
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}
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static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state)
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{
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struct bcm6358_led_priv *priv = dev_get_priv(dev);
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unsigned long mode;
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switch (state) {
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case LEDST_OFF:
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mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
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break;
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case LEDST_ON:
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mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
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break;
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case LEDST_TOGGLE:
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if (bcm6358_led_get_state(dev) == LEDST_OFF)
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return bcm6358_led_set_state(dev, LEDST_ON);
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else
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return bcm6358_led_set_state(dev, LEDST_OFF);
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break;
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default:
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return -ENOSYS;
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}
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return bcm6358_led_set_mode(priv, mode);
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}
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static const struct led_ops bcm6358_led_ops = {
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.get_state = bcm6358_led_get_state,
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.set_state = bcm6358_led_set_state,
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};
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static int bcm6358_led_probe(struct udevice *dev)
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{
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struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
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fdt_addr_t addr;
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fdt_size_t size;
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/* Top-level LED node */
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if (!uc_plat->label) {
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void __iomem *regs;
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unsigned int clk_div;
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u32 set_bits = 0;
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addr = dev_get_addr_size_index(dev, 0, &size);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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regs = ioremap(addr, size);
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if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
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"brcm,clk-dat-low"))
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set_bits |= LED_CTRL_POL_MASK;
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clk_div = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
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"brcm,clk-div", LED_CTRL_CLK_1);
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switch (clk_div) {
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case 8:
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set_bits |= LED_CTRL_CLK_8;
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break;
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case 4:
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set_bits |= LED_CTRL_CLK_4;
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break;
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case 2:
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set_bits |= LED_CTRL_CLK_2;
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break;
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default:
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set_bits |= LED_CTRL_CLK_1;
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break;
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}
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bcm6358_led_busy(regs);
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clrsetbits_be32(regs + LED_CTRL_REG,
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LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
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set_bits);
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} else {
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struct bcm6358_led_priv *priv = dev_get_priv(dev);
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unsigned int pin;
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addr = dev_get_addr_size_index(dev_get_parent(dev), 0, &size);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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pin = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), "reg",
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LEDS_MAX);
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if (pin >= LEDS_MAX)
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return -EINVAL;
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priv->regs = ioremap(addr, size);
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priv->pin = pin;
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if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
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"active-low"))
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priv->active_low = true;
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}
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return 0;
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}
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static int bcm6358_led_bind(struct udevice *parent)
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{
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const void *blob = gd->fdt_blob;
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int node;
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for (node = fdt_first_subnode(blob, dev_of_offset(parent));
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node > 0;
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node = fdt_next_subnode(blob, node)) {
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struct led_uc_plat *uc_plat;
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struct udevice *dev;
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const char *label;
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int ret;
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label = fdt_getprop(blob, node, "label", NULL);
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if (!label) {
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debug("%s: node %s has no label\n", __func__,
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fdt_get_name(blob, node, NULL));
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return -EINVAL;
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}
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ret = device_bind_driver_to_node(parent, "bcm6358-led",
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fdt_get_name(blob, node, NULL),
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node, &dev);
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if (ret)
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return ret;
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uc_plat = dev_get_uclass_platdata(dev);
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uc_plat->label = label;
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}
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return 0;
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}
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static const struct udevice_id bcm6358_led_ids[] = {
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{ .compatible = "brcm,bcm6358-leds" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(bcm6358_led) = {
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.name = "bcm6358-led",
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.id = UCLASS_LED,
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.of_match = bcm6358_led_ids,
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.bind = bcm6358_led_bind,
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.probe = bcm6358_led_probe,
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.priv_auto_alloc_size = sizeof(struct bcm6358_led_priv),
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.ops = &bcm6358_led_ops,
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};
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