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leds: bcm63138: add support for BCM63138 controller
It's a new controller first introduced in BCM63138 SoC. Later it was also used in BCM4908, some BCM68xx and some BCM63xxx SoCs. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Rafał Miłecki
Pavel Machek
parent
13344f8ce8
commit
a0ba692072
@ -1,3 +1,15 @@
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config LEDS_BCM63138
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tristate "LED Support for Broadcom BCM63138 SoC"
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depends on LEDS_CLASS
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depends on ARCH_BCM4908 || ARCH_BCM_5301X || BCM63XX || COMPILE_TEST
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depends on HAS_IOMEM
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depends on OF
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default ARCH_BCM4908
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help
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This option enables support for LED controller that is part of
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BCM63138 SoC. The same hardware block is known to be also used
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in BCM4908, BCM6848, BCM6858, BCM63148, BCM63381 and BCM68360.
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config LEDS_LGM
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tristate "LED support for LGM SoC series"
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depends on X86 || COMPILE_TEST
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@ -1,2 +1,3 @@
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# SPDX-License-Identifier: GPL-2.0
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obj-$(CONFIG_LEDS_BCM63138) += leds-bcm63138.o
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obj-$(CONFIG_LEDS_LGM) += leds-lgm-sso.o
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308
drivers/leds/blink/leds-bcm63138.c
Normal file
308
drivers/leds/blink/leds-bcm63138.c
Normal file
@ -0,0 +1,308 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#define BCM63138_MAX_LEDS 32
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#define BCM63138_MAX_BRIGHTNESS 9
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#define BCM63138_LED_BITS 4 /* how many bits control a single LED */
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#define BCM63138_LED_MASK ((1 << BCM63138_LED_BITS) - 1) /* 0xf */
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#define BCM63138_LEDS_PER_REG (32 / BCM63138_LED_BITS) /* 8 */
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#define BCM63138_GLB_CTRL 0x00
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#define BCM63138_GLB_CTRL_SERIAL_LED_DATA_PPOL 0x00000002
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#define BCM63138_GLB_CTRL_SERIAL_LED_EN_POL 0x00000008
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#define BCM63138_MASK 0x04
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#define BCM63138_HW_LED_EN 0x08
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#define BCM63138_SERIAL_LED_SHIFT_SEL 0x0c
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#define BCM63138_FLASH_RATE_CTRL1 0x10
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#define BCM63138_FLASH_RATE_CTRL2 0x14
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#define BCM63138_FLASH_RATE_CTRL3 0x18
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#define BCM63138_FLASH_RATE_CTRL4 0x1c
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#define BCM63138_BRIGHT_CTRL1 0x20
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#define BCM63138_BRIGHT_CTRL2 0x24
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#define BCM63138_BRIGHT_CTRL3 0x28
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#define BCM63138_BRIGHT_CTRL4 0x2c
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#define BCM63138_POWER_LED_CFG 0x30
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#define BCM63138_HW_POLARITY 0xb4
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#define BCM63138_SW_DATA 0xb8
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#define BCM63138_SW_POLARITY 0xbc
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#define BCM63138_PARALLEL_LED_POLARITY 0xc0
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#define BCM63138_SERIAL_LED_POLARITY 0xc4
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#define BCM63138_HW_LED_STATUS 0xc8
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#define BCM63138_FLASH_CTRL_STATUS 0xcc
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#define BCM63138_FLASH_BRT_CTRL 0xd0
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#define BCM63138_FLASH_P_LED_OUT_STATUS 0xd4
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#define BCM63138_FLASH_S_LED_OUT_STATUS 0xd8
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struct bcm63138_leds {
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struct device *dev;
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void __iomem *base;
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spinlock_t lock;
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};
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struct bcm63138_led {
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struct bcm63138_leds *leds;
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struct led_classdev cdev;
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u32 pin;
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bool active_low;
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};
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/*
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* I/O access
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*/
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static void bcm63138_leds_write(struct bcm63138_leds *leds, unsigned int reg,
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u32 data)
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{
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writel(data, leds->base + reg);
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}
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static unsigned long bcm63138_leds_read(struct bcm63138_leds *leds,
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unsigned int reg)
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{
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return readl(leds->base + reg);
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}
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static void bcm63138_leds_update_bits(struct bcm63138_leds *leds,
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unsigned int reg, u32 mask, u32 val)
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{
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WARN_ON(val & ~mask);
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bcm63138_leds_write(leds, reg, (bcm63138_leds_read(leds, reg) & ~mask) | (val & mask));
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}
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/*
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* Helpers
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*/
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static void bcm63138_leds_set_flash_rate(struct bcm63138_leds *leds,
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struct bcm63138_led *led,
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u8 value)
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{
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int reg_offset = (led->pin >> fls((BCM63138_LEDS_PER_REG - 1))) * 4;
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int shift = (led->pin & (BCM63138_LEDS_PER_REG - 1)) * BCM63138_LED_BITS;
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bcm63138_leds_update_bits(leds, BCM63138_FLASH_RATE_CTRL1 + reg_offset,
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BCM63138_LED_MASK << shift, value << shift);
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}
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static void bcm63138_leds_set_bright(struct bcm63138_leds *leds,
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struct bcm63138_led *led,
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u8 value)
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{
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int reg_offset = (led->pin >> fls((BCM63138_LEDS_PER_REG - 1))) * 4;
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int shift = (led->pin & (BCM63138_LEDS_PER_REG - 1)) * BCM63138_LED_BITS;
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bcm63138_leds_update_bits(leds, BCM63138_BRIGHT_CTRL1 + reg_offset,
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BCM63138_LED_MASK << shift, value << shift);
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}
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static void bcm63138_leds_enable_led(struct bcm63138_leds *leds,
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struct bcm63138_led *led,
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enum led_brightness value)
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{
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u32 bit = BIT(led->pin);
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bcm63138_leds_update_bits(leds, BCM63138_SW_DATA, bit,
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value == LED_OFF ? 0 : bit);
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}
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/*
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* API callbacks
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*/
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static void bcm63138_leds_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct bcm63138_led *led = container_of(led_cdev, struct bcm63138_led, cdev);
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struct bcm63138_leds *leds = led->leds;
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unsigned long flags;
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spin_lock_irqsave(&leds->lock, flags);
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bcm63138_leds_enable_led(leds, led, value);
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if (!value)
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bcm63138_leds_set_flash_rate(leds, led, 0);
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else
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bcm63138_leds_set_bright(leds, led, value);
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spin_unlock_irqrestore(&leds->lock, flags);
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}
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static int bcm63138_leds_blink_set(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off)
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{
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struct bcm63138_led *led = container_of(led_cdev, struct bcm63138_led, cdev);
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struct bcm63138_leds *leds = led->leds;
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unsigned long flags;
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u8 value;
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if (!*delay_on && !*delay_off) {
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*delay_on = 640;
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*delay_off = 640;
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}
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if (*delay_on != *delay_off) {
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dev_dbg(led_cdev->dev, "Blinking at unequal delays is not supported\n");
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return -EINVAL;
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}
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switch (*delay_on) {
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case 1152 ... 1408: /* 1280 ms ± 10% */
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value = 0x7;
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break;
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case 576 ... 704: /* 640 ms ± 10% */
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value = 0x6;
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break;
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case 288 ... 352: /* 320 ms ± 10% */
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value = 0x5;
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break;
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case 126 ... 154: /* 140 ms ± 10% */
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value = 0x4;
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break;
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case 59 ... 72: /* 65 ms ± 10% */
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value = 0x3;
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break;
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default:
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dev_dbg(led_cdev->dev, "Blinking delay value %lu is unsupported\n",
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*delay_on);
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return -EINVAL;
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}
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spin_lock_irqsave(&leds->lock, flags);
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bcm63138_leds_enable_led(leds, led, BCM63138_MAX_BRIGHTNESS);
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bcm63138_leds_set_flash_rate(leds, led, value);
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spin_unlock_irqrestore(&leds->lock, flags);
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return 0;
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}
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/*
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* LED driver
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*/
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static void bcm63138_leds_create_led(struct bcm63138_leds *leds,
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struct device_node *np)
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{
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struct led_init_data init_data = {
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.fwnode = of_fwnode_handle(np),
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};
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struct device *dev = leds->dev;
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struct bcm63138_led *led;
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struct pinctrl *pinctrl;
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u32 bit;
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int err;
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led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
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if (!led) {
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dev_err(dev, "Failed to alloc LED\n");
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return;
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}
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led->leds = leds;
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if (of_property_read_u32(np, "reg", &led->pin)) {
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dev_err(dev, "Missing \"reg\" property in %pOF\n", np);
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goto err_free;
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}
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if (led->pin >= BCM63138_MAX_LEDS) {
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dev_err(dev, "Invalid \"reg\" value %d\n", led->pin);
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goto err_free;
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}
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led->active_low = of_property_read_bool(np, "active-low");
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led->cdev.max_brightness = BCM63138_MAX_BRIGHTNESS;
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led->cdev.brightness_set = bcm63138_leds_brightness_set;
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led->cdev.blink_set = bcm63138_leds_blink_set;
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err = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
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if (err) {
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dev_err(dev, "Failed to register LED %pOF: %d\n", np, err);
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goto err_free;
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}
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pinctrl = devm_pinctrl_get_select_default(led->cdev.dev);
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if (IS_ERR(pinctrl) && PTR_ERR(pinctrl) != -ENODEV) {
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dev_warn(led->cdev.dev, "Failed to select %pOF pinctrl: %ld\n",
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np, PTR_ERR(pinctrl));
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}
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bit = BIT(led->pin);
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bcm63138_leds_update_bits(leds, BCM63138_PARALLEL_LED_POLARITY, bit,
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led->active_low ? 0 : bit);
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bcm63138_leds_update_bits(leds, BCM63138_HW_LED_EN, bit, 0);
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bcm63138_leds_set_flash_rate(leds, led, 0);
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bcm63138_leds_enable_led(leds, led, led->cdev.brightness);
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return;
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err_free:
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devm_kfree(dev, led);
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}
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static int bcm63138_leds_probe(struct platform_device *pdev)
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{
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struct device_node *np = dev_of_node(&pdev->dev);
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struct device *dev = &pdev->dev;
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struct bcm63138_leds *leds;
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struct device_node *child;
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leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
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if (!leds)
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return -ENOMEM;
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leds->dev = dev;
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leds->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(leds->base))
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return PTR_ERR(leds->base);
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spin_lock_init(&leds->lock);
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bcm63138_leds_write(leds, BCM63138_GLB_CTRL,
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BCM63138_GLB_CTRL_SERIAL_LED_DATA_PPOL |
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BCM63138_GLB_CTRL_SERIAL_LED_EN_POL);
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bcm63138_leds_write(leds, BCM63138_HW_LED_EN, 0);
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bcm63138_leds_write(leds, BCM63138_SERIAL_LED_POLARITY, 0);
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bcm63138_leds_write(leds, BCM63138_PARALLEL_LED_POLARITY, 0);
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for_each_available_child_of_node(np, child) {
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bcm63138_leds_create_led(leds, child);
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}
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return 0;
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}
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static const struct of_device_id bcm63138_leds_of_match_table[] = {
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{ .compatible = "brcm,bcm63138-leds", },
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{ },
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};
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static struct platform_driver bcm63138_leds_driver = {
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.probe = bcm63138_leds_probe,
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.driver = {
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.name = "leds-bcm63xxx",
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.of_match_table = bcm63138_leds_of_match_table,
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},
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};
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module_platform_driver(bcm63138_leds_driver);
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MODULE_AUTHOR("Rafał Miłecki");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(of, bcm63138_leds_of_match_table);
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