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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>
This commit is contained in:
Álvaro Fernández Rojas
Daniel Schwierzeck
parent
2791f8db5e
commit
28300dc526
4 changed files with 380 additions and 0 deletions
106
doc/device-tree-bindings/leds/leds-bcm6328.txt
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106
doc/device-tree-bindings/leds/leds-bcm6328.txt
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@ -0,0 +1,106 @@
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LEDs connected to Broadcom BCM6328 controller
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This controller is present on BCM6318, BCM6328, BCM6362 and BCM63268.
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In these SoCs it's possible to control LEDs both as GPIOs or by hardware.
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However, on some devices there are Serial LEDs (LEDs connected to a 74x164
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controller), which can either be controlled by software (exporting the 74x164
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as spi-gpio. See Documentation/devicetree/bindings/gpio/gpio-74x164.txt), or
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by hardware using this driver.
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Some of these Serial LEDs are hardware controlled (e.g. ethernet LEDs) and
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exporting the 74x164 as spi-gpio prevents those LEDs to be hardware
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controlled, so the only chance to keep them working is by using this driver.
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Required properties:
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- compatible : should be "brcm,bcm6328-leds".
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- #address-cells : must be 1.
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- #size-cells : must be 0.
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- reg : BCM6328 LED controller address and size.
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Optional properties:
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- brcm,serial-leds : Boolean, enables Serial LEDs.
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Default : false
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- brcm,serial-mux : Boolean, enables Serial LEDs multiplexing.
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Default : false
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- brcm,serial-clk-low : Boolean, makes clock signal active low.
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Default : false
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- brcm,serial-dat-low : Boolean, makes data signal active low.
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Default : false
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- brcm,serial-shift-inv : Boolean, inverts Serial LEDs shift direction.
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Default : false
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Each LED is represented as a sub-node of the brcm,bcm6328-leds device.
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LED sub-node required properties:
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- reg : LED pin number (only LEDs 0 to 23 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 : BCM6328 with 4 GPIO LEDs
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leds0: led-controller@10000800 {
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compatible = "brcm,bcm6328-leds";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x10000800 0x24>;
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alarm_red@2 {
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reg = <2>;
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active-low;
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label = "red:alarm";
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};
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inet_green@3 {
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reg = <3>;
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active-low;
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label = "green:inet";
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};
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power_green@4 {
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reg = <4>;
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active-low;
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label = "green:power";
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};
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};
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Scenario 2 : BCM63268 with Serial LEDs
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leds0: led-controller@10001900 {
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compatible = "brcm,bcm6328-leds";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x10001900 0x24>;
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brcm,serial-leds;
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brcm,serial-dat-low;
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brcm,serial-shift-inv;
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inet_red@2 {
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reg = <2>;
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active-low;
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label = "red:inet";
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};
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dsl_green@3 {
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reg = <3>;
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active-low;
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label = "green:dsl";
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};
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usb_green@4 {
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reg = <4>;
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active-low;
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label = "green:usb";
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};
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wps_green@7 {
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reg = <7>;
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active-low;
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label = "green:wps";
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};
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inet_green@8 {
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reg = <8>;
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active-low;
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label = "green:inet";
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};
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power_green@20 {
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reg = <20>;
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active-low;
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label = "green:power";
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};
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};
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@ -9,6 +9,17 @@ config LED
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can provide access to board-specific LEDs. Use of the device tree
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for configuration is encouraged.
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config LED_BCM6328
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bool "LED Support for BCM6328"
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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 BCM6328
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LED HW controller accessed via MMIO registers.
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HW blinking is supported and up to 24 LEDs can be controlled.
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All LEDs can blink at the same time but the delay is shared, which
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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_BLINK
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bool "Support LED blinking"
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depends on LED
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@ -6,4 +6,5 @@
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#
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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_$(SPL_)LED_GPIO) += led_gpio.o
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262
drivers/led/led_bcm6328.c
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262
drivers/led/led_bcm6328.c
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@ -0,0 +1,262 @@
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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 24
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/* LED Init register */
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#define LED_INIT_REG 0x00
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#define LED_INIT_FASTINTV_MS 20
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#define LED_INIT_FASTINTV_SHIFT 6
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#define LED_INIT_FASTINTV_MASK (0x3f << LED_INIT_FASTINTV_SHIFT)
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#define LED_INIT_SLEDEN_SHIFT 12
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#define LED_INIT_SLEDEN_MASK (1 << LED_INIT_SLEDEN_SHIFT)
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#define LED_INIT_SLEDMUX_SHIFT 13
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#define LED_INIT_SLEDMUX_MASK (1 << LED_INIT_SLEDMUX_SHIFT)
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#define LED_INIT_SLEDCLKNPOL_SHIFT 14
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#define LED_INIT_SLEDCLKNPOL_MASK (1 << LED_INIT_SLEDCLKNPOL_SHIFT)
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#define LED_INIT_SLEDDATAPPOL_SHIFT 15
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#define LED_INIT_SLEDDATANPOL_MASK (1 << LED_INIT_SLEDDATAPPOL_SHIFT)
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#define LED_INIT_SLEDSHIFTDIR_SHIFT 16
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#define LED_INIT_SLEDSHIFTDIR_MASK (1 << LED_INIT_SLEDSHIFTDIR_SHIFT)
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/* LED Mode registers */
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#define LED_MODE_REG_HI 0x04
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#define LED_MODE_REG_LO 0x08
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#define LED_MODE_ON 0
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#define LED_MODE_FAST 1
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#define LED_MODE_BLINK 2
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#define LED_MODE_OFF 3
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#define LED_MODE_MASK 0x3
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DECLARE_GLOBAL_DATA_PTR;
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struct bcm6328_led_priv {
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void __iomem *regs;
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void __iomem *mode;
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uint8_t shift;
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bool active_low;
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};
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static unsigned long bcm6328_led_get_mode(struct bcm6328_led_priv *priv)
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{
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return ((readl_be(priv->mode) >> priv->shift) & LED_MODE_MASK);
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}
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static int bcm6328_led_set_mode(struct bcm6328_led_priv *priv, uint8_t mode)
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{
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clrsetbits_be32(priv->mode, (LED_MODE_MASK << priv->shift),
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(mode << priv->shift));
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return 0;
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}
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static enum led_state_t bcm6328_led_get_state(struct udevice *dev)
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{
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struct bcm6328_led_priv *priv = dev_get_priv(dev);
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enum led_state_t state = LEDST_OFF;
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switch (bcm6328_led_get_mode(priv)) {
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#ifdef CONFIG_LED_BLINK
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case LED_MODE_BLINK:
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case LED_MODE_FAST:
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state = LEDST_BLINK;
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break;
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#endif
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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 bcm6328_led_set_state(struct udevice *dev, enum led_state_t state)
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{
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struct bcm6328_led_priv *priv = dev_get_priv(dev);
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unsigned long mode;
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switch (state) {
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#ifdef CONFIG_LED_BLINK
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case LEDST_BLINK:
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mode = LED_MODE_BLINK;
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break;
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#endif
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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 (bcm6328_led_get_state(dev) == LEDST_OFF)
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return bcm6328_led_set_state(dev, LEDST_ON);
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else
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return bcm6328_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 bcm6328_led_set_mode(priv, mode);
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}
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#ifdef CONFIG_LED_BLINK
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static unsigned long bcm6328_blink_delay(int delay)
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{
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unsigned long bcm6328_delay = delay;
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bcm6328_delay += (LED_INIT_FASTINTV_MS / 2);
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bcm6328_delay /= LED_INIT_FASTINTV_MS;
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bcm6328_delay <<= LED_INIT_FASTINTV_SHIFT;
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if (bcm6328_delay > LED_INIT_FASTINTV_MASK)
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return LED_INIT_FASTINTV_MASK;
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else
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return bcm6328_delay;
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}
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static int bcm6328_led_set_period(struct udevice *dev, int period_ms)
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{
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struct bcm6328_led_priv *priv = dev_get_priv(dev);
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clrsetbits_be32(priv->regs + LED_INIT_REG, LED_INIT_FASTINTV_MASK,
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bcm6328_blink_delay(period_ms));
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return 0;
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}
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#endif
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static const struct led_ops bcm6328_led_ops = {
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.get_state = bcm6328_led_get_state,
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.set_state = bcm6328_led_set_state,
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#ifdef CONFIG_LED_BLINK
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.set_period = bcm6328_led_set_period,
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#endif
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};
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static int bcm6328_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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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,serial-leds"))
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set_bits |= LED_INIT_SLEDEN_MASK;
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if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
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"brcm,serial-mux"))
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set_bits |= LED_INIT_SLEDMUX_MASK;
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if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
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"brcm,serial-clk-low"))
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set_bits |= LED_INIT_SLEDCLKNPOL_MASK;
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if (!fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
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"brcm,serial-dat-low"))
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set_bits |= LED_INIT_SLEDDATANPOL_MASK;
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if (!fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
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"brcm,serial-shift-inv"))
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set_bits |= LED_INIT_SLEDSHIFTDIR_MASK;
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clrsetbits_be32(regs + LED_INIT_REG, ~0, set_bits);
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} else {
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struct bcm6328_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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if (pin < 8) {
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/* LEDs 0-7 (bits 47:32) */
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priv->mode = priv->regs + LED_MODE_REG_HI;
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priv->shift = (pin << 1);
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} else {
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/* LEDs 8-23 (bits 31:0) */
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priv->mode = priv->regs + LED_MODE_REG_LO;
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priv->shift = ((pin - 8) << 1);
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}
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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 bcm6328_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, "bcm6328-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 bcm6328_led_ids[] = {
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{ .compatible = "brcm,bcm6328-leds" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(bcm6328_led) = {
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.name = "bcm6328-led",
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.id = UCLASS_LED,
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.of_match = bcm6328_led_ids,
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.ops = &bcm6328_led_ops,
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.bind = bcm6328_led_bind,
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.probe = bcm6328_led_probe,
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.priv_auto_alloc_size = sizeof(struct bcm6328_led_priv),
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};
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