+++ /dev/null
-From a0ba692072d89075d0a75c7ad9df31f2c1ee9a1c Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
-Date: Mon, 27 Dec 2021 15:59:05 +0100
-Subject: [PATCH] leds: bcm63138: add support for BCM63138 controller
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-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>
----
- drivers/leds/blink/Kconfig | 12 ++
- drivers/leds/blink/Makefile | 1 +
- drivers/leds/blink/leds-bcm63138.c | 308 +++++++++++++++++++++++++++++
- 3 files changed, 321 insertions(+)
- create mode 100644 drivers/leds/blink/leds-bcm63138.c
-
---- /dev/null
-+++ b/drivers/leds/blink/Kconfig
-@@ -0,0 +1,11 @@
-+config LEDS_BCM63138
-+ tristate "LED Support for Broadcom BCM63138 SoC"
-+ depends on LEDS_CLASS
-+ depends on ARCH_BCM4908 || ARCH_BCM_5301X || BCM63XX || COMPILE_TEST
-+ depends on HAS_IOMEM
-+ depends on OF
-+ default ARCH_BCM4908
-+ help
-+ This option enables support for LED controller that is part of
-+ BCM63138 SoC. The same hardware block is known to be also used
-+ in BCM4908, BCM6848, BCM6858, BCM63148, BCM63381 and BCM68360.
---- /dev/null
-+++ b/drivers/leds/blink/Makefile
-@@ -0,0 +1,2 @@
-+# SPDX-License-Identifier: GPL-2.0
-+obj-$(CONFIG_LEDS_BCM63138) += leds-bcm63138.o
---- /dev/null
-+++ b/drivers/leds/blink/leds-bcm63138.c
-@@ -0,0 +1,308 @@
-+// SPDX-License-Identifier: GPL-2.0-only
-+/*
-+ * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
-+ */
-+#include <linux/delay.h>
-+#include <linux/io.h>
-+#include <linux/leds.h>
-+#include <linux/module.h>
-+#include <linux/of.h>
-+#include <linux/pinctrl/consumer.h>
-+#include <linux/platform_device.h>
-+#include <linux/spinlock.h>
-+
-+#define BCM63138_MAX_LEDS 32
-+#define BCM63138_MAX_BRIGHTNESS 9
-+
-+#define BCM63138_LED_BITS 4 /* how many bits control a single LED */
-+#define BCM63138_LED_MASK ((1 << BCM63138_LED_BITS) - 1) /* 0xf */
-+#define BCM63138_LEDS_PER_REG (32 / BCM63138_LED_BITS) /* 8 */
-+
-+#define BCM63138_GLB_CTRL 0x00
-+#define BCM63138_GLB_CTRL_SERIAL_LED_DATA_PPOL 0x00000002
-+#define BCM63138_GLB_CTRL_SERIAL_LED_EN_POL 0x00000008
-+#define BCM63138_MASK 0x04
-+#define BCM63138_HW_LED_EN 0x08
-+#define BCM63138_SERIAL_LED_SHIFT_SEL 0x0c
-+#define BCM63138_FLASH_RATE_CTRL1 0x10
-+#define BCM63138_FLASH_RATE_CTRL2 0x14
-+#define BCM63138_FLASH_RATE_CTRL3 0x18
-+#define BCM63138_FLASH_RATE_CTRL4 0x1c
-+#define BCM63138_BRIGHT_CTRL1 0x20
-+#define BCM63138_BRIGHT_CTRL2 0x24
-+#define BCM63138_BRIGHT_CTRL3 0x28
-+#define BCM63138_BRIGHT_CTRL4 0x2c
-+#define BCM63138_POWER_LED_CFG 0x30
-+#define BCM63138_HW_POLARITY 0xb4
-+#define BCM63138_SW_DATA 0xb8
-+#define BCM63138_SW_POLARITY 0xbc
-+#define BCM63138_PARALLEL_LED_POLARITY 0xc0
-+#define BCM63138_SERIAL_LED_POLARITY 0xc4
-+#define BCM63138_HW_LED_STATUS 0xc8
-+#define BCM63138_FLASH_CTRL_STATUS 0xcc
-+#define BCM63138_FLASH_BRT_CTRL 0xd0
-+#define BCM63138_FLASH_P_LED_OUT_STATUS 0xd4
-+#define BCM63138_FLASH_S_LED_OUT_STATUS 0xd8
-+
-+struct bcm63138_leds {
-+ struct device *dev;
-+ void __iomem *base;
-+ spinlock_t lock;
-+};
-+
-+struct bcm63138_led {
-+ struct bcm63138_leds *leds;
-+ struct led_classdev cdev;
-+ u32 pin;
-+ bool active_low;
-+};
-+
-+/*
-+ * I/O access
-+ */
-+
-+static void bcm63138_leds_write(struct bcm63138_leds *leds, unsigned int reg,
-+ u32 data)
-+{
-+ writel(data, leds->base + reg);
-+}
-+
-+static unsigned long bcm63138_leds_read(struct bcm63138_leds *leds,
-+ unsigned int reg)
-+{
-+ return readl(leds->base + reg);
-+}
-+
-+static void bcm63138_leds_update_bits(struct bcm63138_leds *leds,
-+ unsigned int reg, u32 mask, u32 val)
-+{
-+ WARN_ON(val & ~mask);
-+
-+ bcm63138_leds_write(leds, reg, (bcm63138_leds_read(leds, reg) & ~mask) | (val & mask));
-+}
-+
-+/*
-+ * Helpers
-+ */
-+
-+static void bcm63138_leds_set_flash_rate(struct bcm63138_leds *leds,
-+ struct bcm63138_led *led,
-+ u8 value)
-+{
-+ int reg_offset = (led->pin >> fls((BCM63138_LEDS_PER_REG - 1))) * 4;
-+ int shift = (led->pin & (BCM63138_LEDS_PER_REG - 1)) * BCM63138_LED_BITS;
-+
-+ bcm63138_leds_update_bits(leds, BCM63138_FLASH_RATE_CTRL1 + reg_offset,
-+ BCM63138_LED_MASK << shift, value << shift);
-+}
-+
-+static void bcm63138_leds_set_bright(struct bcm63138_leds *leds,
-+ struct bcm63138_led *led,
-+ u8 value)
-+{
-+ int reg_offset = (led->pin >> fls((BCM63138_LEDS_PER_REG - 1))) * 4;
-+ int shift = (led->pin & (BCM63138_LEDS_PER_REG - 1)) * BCM63138_LED_BITS;
-+
-+ bcm63138_leds_update_bits(leds, BCM63138_BRIGHT_CTRL1 + reg_offset,
-+ BCM63138_LED_MASK << shift, value << shift);
-+}
-+
-+static void bcm63138_leds_enable_led(struct bcm63138_leds *leds,
-+ struct bcm63138_led *led,
-+ enum led_brightness value)
-+{
-+ u32 bit = BIT(led->pin);
-+
-+ bcm63138_leds_update_bits(leds, BCM63138_SW_DATA, bit,
-+ value == LED_OFF ? 0 : bit);
-+}
-+
-+/*
-+ * API callbacks
-+ */
-+
-+static void bcm63138_leds_brightness_set(struct led_classdev *led_cdev,
-+ enum led_brightness value)
-+{
-+ struct bcm63138_led *led = container_of(led_cdev, struct bcm63138_led, cdev);
-+ struct bcm63138_leds *leds = led->leds;
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&leds->lock, flags);
-+
-+ bcm63138_leds_enable_led(leds, led, value);
-+ if (!value)
-+ bcm63138_leds_set_flash_rate(leds, led, 0);
-+ else
-+ bcm63138_leds_set_bright(leds, led, value);
-+
-+ spin_unlock_irqrestore(&leds->lock, flags);
-+}
-+
-+static int bcm63138_leds_blink_set(struct led_classdev *led_cdev,
-+ unsigned long *delay_on,
-+ unsigned long *delay_off)
-+{
-+ struct bcm63138_led *led = container_of(led_cdev, struct bcm63138_led, cdev);
-+ struct bcm63138_leds *leds = led->leds;
-+ unsigned long flags;
-+ u8 value;
-+
-+ if (!*delay_on && !*delay_off) {
-+ *delay_on = 640;
-+ *delay_off = 640;
-+ }
-+
-+ if (*delay_on != *delay_off) {
-+ dev_dbg(led_cdev->dev, "Blinking at unequal delays is not supported\n");
-+ return -EINVAL;
-+ }
-+
-+ switch (*delay_on) {
-+ case 1152 ... 1408: /* 1280 ms ± 10% */
-+ value = 0x7;
-+ break;
-+ case 576 ... 704: /* 640 ms ± 10% */
-+ value = 0x6;
-+ break;
-+ case 288 ... 352: /* 320 ms ± 10% */
-+ value = 0x5;
-+ break;
-+ case 126 ... 154: /* 140 ms ± 10% */
-+ value = 0x4;
-+ break;
-+ case 59 ... 72: /* 65 ms ± 10% */
-+ value = 0x3;
-+ break;
-+ default:
-+ dev_dbg(led_cdev->dev, "Blinking delay value %lu is unsupported\n",
-+ *delay_on);
-+ return -EINVAL;
-+ }
-+
-+ spin_lock_irqsave(&leds->lock, flags);
-+
-+ bcm63138_leds_enable_led(leds, led, BCM63138_MAX_BRIGHTNESS);
-+ bcm63138_leds_set_flash_rate(leds, led, value);
-+
-+ spin_unlock_irqrestore(&leds->lock, flags);
-+
-+ return 0;
-+}
-+
-+/*
-+ * LED driver
-+ */
-+
-+static void bcm63138_leds_create_led(struct bcm63138_leds *leds,
-+ struct device_node *np)
-+{
-+ struct led_init_data init_data = {
-+ .fwnode = of_fwnode_handle(np),
-+ };
-+ struct device *dev = leds->dev;
-+ struct bcm63138_led *led;
-+ struct pinctrl *pinctrl;
-+ u32 bit;
-+ int err;
-+
-+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
-+ if (!led) {
-+ dev_err(dev, "Failed to alloc LED\n");
-+ return;
-+ }
-+
-+ led->leds = leds;
-+
-+ if (of_property_read_u32(np, "reg", &led->pin)) {
-+ dev_err(dev, "Missing \"reg\" property in %pOF\n", np);
-+ goto err_free;
-+ }
-+
-+ if (led->pin >= BCM63138_MAX_LEDS) {
-+ dev_err(dev, "Invalid \"reg\" value %d\n", led->pin);
-+ goto err_free;
-+ }
-+
-+ led->active_low = of_property_read_bool(np, "active-low");
-+
-+ led->cdev.max_brightness = BCM63138_MAX_BRIGHTNESS;
-+ led->cdev.brightness_set = bcm63138_leds_brightness_set;
-+ led->cdev.blink_set = bcm63138_leds_blink_set;
-+
-+ err = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
-+ if (err) {
-+ dev_err(dev, "Failed to register LED %pOF: %d\n", np, err);
-+ goto err_free;
-+ }
-+
-+ pinctrl = devm_pinctrl_get_select_default(led->cdev.dev);
-+ if (IS_ERR(pinctrl) && PTR_ERR(pinctrl) != -ENODEV) {
-+ dev_warn(led->cdev.dev, "Failed to select %pOF pinctrl: %ld\n",
-+ np, PTR_ERR(pinctrl));
-+ }
-+
-+ bit = BIT(led->pin);
-+ bcm63138_leds_update_bits(leds, BCM63138_PARALLEL_LED_POLARITY, bit,
-+ led->active_low ? 0 : bit);
-+ bcm63138_leds_update_bits(leds, BCM63138_HW_LED_EN, bit, 0);
-+ bcm63138_leds_set_flash_rate(leds, led, 0);
-+ bcm63138_leds_enable_led(leds, led, led->cdev.brightness);
-+
-+ return;
-+
-+err_free:
-+ devm_kfree(dev, led);
-+}
-+
-+static int bcm63138_leds_probe(struct platform_device *pdev)
-+{
-+ struct device_node *np = dev_of_node(&pdev->dev);
-+ struct device *dev = &pdev->dev;
-+ struct bcm63138_leds *leds;
-+ struct device_node *child;
-+
-+ leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
-+ if (!leds)
-+ return -ENOMEM;
-+
-+ leds->dev = dev;
-+
-+ leds->base = devm_platform_ioremap_resource(pdev, 0);
-+ if (IS_ERR(leds->base))
-+ return PTR_ERR(leds->base);
-+
-+ spin_lock_init(&leds->lock);
-+
-+ bcm63138_leds_write(leds, BCM63138_GLB_CTRL,
-+ BCM63138_GLB_CTRL_SERIAL_LED_DATA_PPOL |
-+ BCM63138_GLB_CTRL_SERIAL_LED_EN_POL);
-+ bcm63138_leds_write(leds, BCM63138_HW_LED_EN, 0);
-+ bcm63138_leds_write(leds, BCM63138_SERIAL_LED_POLARITY, 0);
-+ bcm63138_leds_write(leds, BCM63138_PARALLEL_LED_POLARITY, 0);
-+
-+ for_each_available_child_of_node(np, child) {
-+ bcm63138_leds_create_led(leds, child);
-+ }
-+
-+ return 0;
-+}
-+
-+static const struct of_device_id bcm63138_leds_of_match_table[] = {
-+ { .compatible = "brcm,bcm63138-leds", },
-+ { },
-+};
-+
-+static struct platform_driver bcm63138_leds_driver = {
-+ .probe = bcm63138_leds_probe,
-+ .driver = {
-+ .name = "leds-bcm63xxx",
-+ .of_match_table = bcm63138_leds_of_match_table,
-+ },
-+};
-+
-+module_platform_driver(bcm63138_leds_driver);
-+
-+MODULE_AUTHOR("Rafał Miłecki");
-+MODULE_LICENSE("GPL");
-+MODULE_DEVICE_TABLE(of, bcm63138_leds_of_match_table);
---- a/drivers/leds/Kconfig
-+++ b/drivers/leds/Kconfig
-@@ -929,6 +929,8 @@ config LEDS_ACER_A500
- This option enables support for the Power Button LED of
- Acer Iconia Tab A500.
-
-+source "drivers/leds/blink/Kconfig"
-+
- comment "LED Triggers"
- source "drivers/leds/trigger/Kconfig"
-
---- a/drivers/leds/Makefile
-+++ b/drivers/leds/Makefile
-@@ -105,3 +105,6 @@ obj-$(CONFIG_LEDS_USER) += uleds.o
-
- # LED Triggers
- obj-$(CONFIG_LEDS_TRIGGERS) += trigger/
-+
-+# LED Blink
-+obj-y += blink/
projects / openwrt / openwrt.git / blobdiff