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357 lines
9.9 KiB
Diff
357 lines
9.9 KiB
Diff
From a0ba692072d89075d0a75c7ad9df31f2c1ee9a1c Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Mon, 27 Dec 2021 15:59:05 +0100
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Subject: [PATCH] leds: bcm63138: add support for BCM63138 controller
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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It's a new controller first introduced in BCM63138 SoC. Later it was
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also used in BCM4908, some BCM68xx and some BCM63xxx SoCs.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: Pavel Machek <pavel@ucw.cz>
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---
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drivers/leds/blink/Kconfig | 12 ++
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drivers/leds/blink/Makefile | 1 +
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drivers/leds/blink/leds-bcm63138.c | 308 +++++++++++++++++++++++++++++
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3 files changed, 321 insertions(+)
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create mode 100644 drivers/leds/blink/leds-bcm63138.c
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--- a/drivers/leds/blink/Kconfig
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+++ b/drivers/leds/blink/Kconfig
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@@ -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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+
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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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--- a/drivers/leds/blink/Makefile
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+++ b/drivers/leds/blink/Makefile
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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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--- /dev/null
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+++ b/drivers/leds/blink/leds-bcm63138.c
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@@ -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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+
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+#define BCM63138_MAX_LEDS 32
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+#define BCM63138_MAX_BRIGHTNESS 9
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+
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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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+
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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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+
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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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+
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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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+/*
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+ * I/O access
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+ */
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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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+
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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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+
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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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+
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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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+/*
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+ * Helpers
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+ */
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+/*
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+ * API callbacks
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+ */
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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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+
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+ spin_lock_irqsave(&leds->lock, flags);
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+
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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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+
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+ spin_unlock_irqrestore(&leds->lock, flags);
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+}
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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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+
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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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+
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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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+
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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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+
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+ spin_lock_irqsave(&leds->lock, flags);
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+
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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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+
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+ spin_unlock_irqrestore(&leds->lock, flags);
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+
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+ return 0;
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+}
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+
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+/*
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+ * LED driver
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+ */
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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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+
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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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+
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+ led->leds = leds;
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+
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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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+
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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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+
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+ led->active_low = of_property_read_bool(np, "active-low");
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+
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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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+
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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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+
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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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+
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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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+
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+ return;
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+
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+err_free:
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+ devm_kfree(dev, led);
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+}
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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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+
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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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+
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+ leds->dev = dev;
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+
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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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+
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+ spin_lock_init(&leds->lock);
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+
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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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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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+module_platform_driver(bcm63138_leds_driver);
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+
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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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