447 lines
12 KiB
C
447 lines
12 KiB
C
/*
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* Driver for BCM6328 memory-mapped LEDs, based on leds-syscon.c
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*
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* Copyright 2015 Álvaro Fernández Rojas <noltari@gmail.com>
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* Copyright 2015 Jonas Gorski <jogo@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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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/platform_device.h>
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#include <linux/spinlock.h>
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#define BCM6328_REG_INIT 0x00
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#define BCM6328_REG_MODE_HI 0x04
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#define BCM6328_REG_MODE_LO 0x08
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#define BCM6328_REG_HWDIS 0x0c
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#define BCM6328_REG_STROBE 0x10
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#define BCM6328_REG_LNKACTSEL_HI 0x14
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#define BCM6328_REG_LNKACTSEL_LO 0x18
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#define BCM6328_REG_RBACK 0x1c
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#define BCM6328_REG_SERMUX 0x20
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#define BCM6328_LED_MAX_COUNT 24
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#define BCM6328_LED_DEF_DELAY 500
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#define BCM6328_LED_INTERVAL_MS 20
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#define BCM6328_LED_INTV_MASK 0x3f
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#define BCM6328_LED_FAST_INTV_SHIFT 6
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#define BCM6328_LED_FAST_INTV_MASK (BCM6328_LED_INTV_MASK << \
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BCM6328_LED_FAST_INTV_SHIFT)
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#define BCM6328_SERIAL_LED_EN BIT(12)
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#define BCM6328_SERIAL_LED_MUX BIT(13)
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#define BCM6328_SERIAL_LED_CLK_NPOL BIT(14)
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#define BCM6328_SERIAL_LED_DATA_PPOL BIT(15)
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#define BCM6328_SERIAL_LED_SHIFT_DIR BIT(16)
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#define BCM6328_LED_SHIFT_TEST BIT(30)
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#define BCM6328_LED_TEST BIT(31)
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#define BCM6328_INIT_MASK (BCM6328_SERIAL_LED_EN | \
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BCM6328_SERIAL_LED_MUX | \
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BCM6328_SERIAL_LED_CLK_NPOL | \
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BCM6328_SERIAL_LED_DATA_PPOL | \
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BCM6328_SERIAL_LED_SHIFT_DIR)
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#define BCM6328_LED_MODE_MASK 3
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#define BCM6328_LED_MODE_ON 0
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#define BCM6328_LED_MODE_FAST 1
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#define BCM6328_LED_MODE_BLINK 2
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#define BCM6328_LED_MODE_OFF 3
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#define BCM6328_LED_SHIFT(X) ((X) << 1)
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/**
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* struct bcm6328_led - state container for bcm6328 based LEDs
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* @cdev: LED class device for this LED
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* @mem: memory resource
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* @lock: memory lock
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* @pin: LED pin number
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* @blink_leds: blinking LEDs
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* @blink_delay: blinking delay
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* @active_low: LED is active low
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*/
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struct bcm6328_led {
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struct led_classdev cdev;
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void __iomem *mem;
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spinlock_t *lock;
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unsigned long pin;
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unsigned long *blink_leds;
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unsigned long *blink_delay;
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bool active_low;
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};
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static void bcm6328_led_write(void __iomem *reg, unsigned long data)
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{
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#ifdef CONFIG_CPU_BIG_ENDIAN
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iowrite32be(data, reg);
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#else
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writel(data, reg);
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#endif
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}
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static unsigned long bcm6328_led_read(void __iomem *reg)
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{
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#ifdef CONFIG_CPU_BIG_ENDIAN
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return ioread32be(reg);
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#else
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return readl(reg);
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#endif
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}
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/**
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* LEDMode 64 bits / 24 LEDs
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* bits [31:0] -> LEDs 8-23
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* bits [47:32] -> LEDs 0-7
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* bits [63:48] -> unused
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*/
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static unsigned long bcm6328_pin2shift(unsigned long pin)
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{
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if (pin < 8)
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return pin + 16; /* LEDs 0-7 (bits 47:32) */
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else
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return pin - 8; /* LEDs 8-23 (bits 31:0) */
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}
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static void bcm6328_led_mode(struct bcm6328_led *led, unsigned long value)
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{
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void __iomem *mode;
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unsigned long val, shift;
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shift = bcm6328_pin2shift(led->pin);
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if (shift / 16)
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mode = led->mem + BCM6328_REG_MODE_HI;
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else
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mode = led->mem + BCM6328_REG_MODE_LO;
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val = bcm6328_led_read(mode);
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val &= ~(BCM6328_LED_MODE_MASK << BCM6328_LED_SHIFT(shift % 16));
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val |= (value << BCM6328_LED_SHIFT(shift % 16));
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bcm6328_led_write(mode, val);
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}
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static void bcm6328_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct bcm6328_led *led =
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container_of(led_cdev, struct bcm6328_led, cdev);
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unsigned long flags;
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spin_lock_irqsave(led->lock, flags);
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*(led->blink_leds) &= ~BIT(led->pin);
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if ((led->active_low && value == LED_OFF) ||
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(!led->active_low && value != LED_OFF))
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bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
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else
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bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
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spin_unlock_irqrestore(led->lock, flags);
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}
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static unsigned long bcm6328_blink_delay(unsigned long delay)
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{
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unsigned long bcm6328_delay;
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bcm6328_delay = delay + BCM6328_LED_INTERVAL_MS / 2;
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bcm6328_delay = bcm6328_delay / BCM6328_LED_INTERVAL_MS;
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if (bcm6328_delay == 0)
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bcm6328_delay = 1;
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return bcm6328_delay;
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}
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static int bcm6328_blink_set(struct led_classdev *led_cdev,
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unsigned long *delay_on, unsigned long *delay_off)
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{
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struct bcm6328_led *led =
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container_of(led_cdev, struct bcm6328_led, cdev);
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unsigned long delay, flags;
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int rc;
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if (!*delay_on)
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*delay_on = BCM6328_LED_DEF_DELAY;
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if (!*delay_off)
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*delay_off = BCM6328_LED_DEF_DELAY;
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delay = bcm6328_blink_delay(*delay_on);
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if (delay != bcm6328_blink_delay(*delay_off)) {
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dev_dbg(led_cdev->dev,
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"fallback to soft blinking (delay_on != delay_off)\n");
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return -EINVAL;
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}
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if (delay > BCM6328_LED_INTV_MASK) {
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dev_dbg(led_cdev->dev,
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"fallback to soft blinking (delay > %ums)\n",
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BCM6328_LED_INTV_MASK * BCM6328_LED_INTERVAL_MS);
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return -EINVAL;
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}
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spin_lock_irqsave(led->lock, flags);
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if (*(led->blink_leds) == 0 ||
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*(led->blink_leds) == BIT(led->pin) ||
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*(led->blink_delay) == delay) {
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unsigned long val;
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*(led->blink_leds) |= BIT(led->pin);
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*(led->blink_delay) = delay;
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val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
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val &= ~BCM6328_LED_FAST_INTV_MASK;
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val |= (delay << BCM6328_LED_FAST_INTV_SHIFT);
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bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
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bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK);
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rc = 0;
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} else {
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dev_dbg(led_cdev->dev,
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"fallback to soft blinking (delay already set)\n");
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rc = -EINVAL;
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}
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spin_unlock_irqrestore(led->lock, flags);
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return rc;
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}
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static int bcm6328_hwled(struct device *dev, struct device_node *nc, u32 reg,
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void __iomem *mem, spinlock_t *lock)
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{
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int i, cnt;
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unsigned long flags, val;
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spin_lock_irqsave(lock, flags);
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val = bcm6328_led_read(mem + BCM6328_REG_HWDIS);
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val &= ~BIT(reg);
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bcm6328_led_write(mem + BCM6328_REG_HWDIS, val);
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spin_unlock_irqrestore(lock, flags);
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/* Only LEDs 0-7 can be activity/link controlled */
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if (reg >= 8)
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return 0;
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cnt = of_property_count_elems_of_size(nc, "brcm,link-signal-sources",
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sizeof(u32));
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for (i = 0; i < cnt; i++) {
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u32 sel;
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void __iomem *addr;
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if (reg < 4)
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addr = mem + BCM6328_REG_LNKACTSEL_LO;
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else
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addr = mem + BCM6328_REG_LNKACTSEL_HI;
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of_property_read_u32_index(nc, "brcm,link-signal-sources", i,
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&sel);
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if (reg / 4 != sel / 4) {
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dev_warn(dev, "invalid link signal source\n");
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continue;
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}
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spin_lock_irqsave(lock, flags);
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val = bcm6328_led_read(addr);
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val |= (BIT(reg % 4) << (((sel % 4) * 4) + 16));
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bcm6328_led_write(addr, val);
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spin_unlock_irqrestore(lock, flags);
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}
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cnt = of_property_count_elems_of_size(nc,
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"brcm,activity-signal-sources",
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sizeof(u32));
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for (i = 0; i < cnt; i++) {
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u32 sel;
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void __iomem *addr;
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if (reg < 4)
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addr = mem + BCM6328_REG_LNKACTSEL_LO;
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else
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addr = mem + BCM6328_REG_LNKACTSEL_HI;
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of_property_read_u32_index(nc, "brcm,activity-signal-sources",
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i, &sel);
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if (reg / 4 != sel / 4) {
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dev_warn(dev, "invalid activity signal source\n");
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continue;
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}
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spin_lock_irqsave(lock, flags);
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val = bcm6328_led_read(addr);
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val |= (BIT(reg % 4) << ((sel % 4) * 4));
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bcm6328_led_write(addr, val);
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spin_unlock_irqrestore(lock, flags);
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}
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return 0;
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}
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static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg,
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void __iomem *mem, spinlock_t *lock,
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unsigned long *blink_leds, unsigned long *blink_delay)
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{
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struct bcm6328_led *led;
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const char *state;
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int rc;
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led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
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if (!led)
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return -ENOMEM;
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led->pin = reg;
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led->mem = mem;
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led->lock = lock;
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led->blink_leds = blink_leds;
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led->blink_delay = blink_delay;
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if (of_property_read_bool(nc, "active-low"))
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led->active_low = true;
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led->cdev.name = of_get_property(nc, "label", NULL) ? : nc->name;
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led->cdev.default_trigger = of_get_property(nc,
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"linux,default-trigger",
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NULL);
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if (!of_property_read_string(nc, "default-state", &state)) {
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if (!strcmp(state, "on")) {
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led->cdev.brightness = LED_FULL;
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} else if (!strcmp(state, "keep")) {
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void __iomem *mode;
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unsigned long val, shift;
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shift = bcm6328_pin2shift(led->pin);
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if (shift / 16)
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mode = mem + BCM6328_REG_MODE_HI;
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else
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mode = mem + BCM6328_REG_MODE_LO;
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val = bcm6328_led_read(mode) >>
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BCM6328_LED_SHIFT(shift % 16);
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val &= BCM6328_LED_MODE_MASK;
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if ((led->active_low && val == BCM6328_LED_MODE_OFF) ||
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(!led->active_low && val == BCM6328_LED_MODE_ON))
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led->cdev.brightness = LED_FULL;
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else
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led->cdev.brightness = LED_OFF;
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} else {
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led->cdev.brightness = LED_OFF;
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}
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} else {
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led->cdev.brightness = LED_OFF;
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}
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bcm6328_led_set(&led->cdev, led->cdev.brightness);
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led->cdev.brightness_set = bcm6328_led_set;
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led->cdev.blink_set = bcm6328_blink_set;
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rc = devm_led_classdev_register(dev, &led->cdev);
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if (rc < 0)
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return rc;
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dev_dbg(dev, "registered LED %s\n", led->cdev.name);
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return 0;
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}
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static int bcm6328_leds_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = pdev->dev.of_node;
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struct device_node *child;
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struct resource *mem_r;
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void __iomem *mem;
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spinlock_t *lock; /* memory lock */
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unsigned long val, *blink_leds, *blink_delay;
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mem_r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem_r)
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return -EINVAL;
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mem = devm_ioremap_resource(dev, mem_r);
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if (IS_ERR(mem))
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return PTR_ERR(mem);
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lock = devm_kzalloc(dev, sizeof(*lock), GFP_KERNEL);
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if (!lock)
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return -ENOMEM;
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blink_leds = devm_kzalloc(dev, sizeof(*blink_leds), GFP_KERNEL);
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if (!blink_leds)
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return -ENOMEM;
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blink_delay = devm_kzalloc(dev, sizeof(*blink_delay), GFP_KERNEL);
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if (!blink_delay)
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return -ENOMEM;
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spin_lock_init(lock);
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bcm6328_led_write(mem + BCM6328_REG_HWDIS, ~0);
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bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_HI, 0);
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bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_LO, 0);
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val = bcm6328_led_read(mem + BCM6328_REG_INIT);
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val &= ~(BCM6328_INIT_MASK);
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if (of_property_read_bool(np, "brcm,serial-leds"))
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val |= BCM6328_SERIAL_LED_EN;
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if (of_property_read_bool(np, "brcm,serial-mux"))
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val |= BCM6328_SERIAL_LED_MUX;
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if (of_property_read_bool(np, "brcm,serial-clk-low"))
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val |= BCM6328_SERIAL_LED_CLK_NPOL;
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if (!of_property_read_bool(np, "brcm,serial-dat-low"))
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val |= BCM6328_SERIAL_LED_DATA_PPOL;
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if (!of_property_read_bool(np, "brcm,serial-shift-inv"))
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val |= BCM6328_SERIAL_LED_SHIFT_DIR;
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bcm6328_led_write(mem + BCM6328_REG_INIT, val);
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for_each_available_child_of_node(np, child) {
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int rc;
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u32 reg;
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if (of_property_read_u32(child, "reg", ®))
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continue;
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if (reg >= BCM6328_LED_MAX_COUNT) {
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dev_err(dev, "invalid LED (%u >= %d)\n", reg,
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BCM6328_LED_MAX_COUNT);
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continue;
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}
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if (of_property_read_bool(child, "brcm,hardware-controlled"))
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rc = bcm6328_hwled(dev, child, reg, mem, lock);
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else
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rc = bcm6328_led(dev, child, reg, mem, lock,
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blink_leds, blink_delay);
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if (rc < 0) {
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of_node_put(child);
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return rc;
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}
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}
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return 0;
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}
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static const struct of_device_id bcm6328_leds_of_match[] = {
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{ .compatible = "brcm,bcm6328-leds", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, bcm6328_leds_of_match);
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static struct platform_driver bcm6328_leds_driver = {
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.probe = bcm6328_leds_probe,
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.driver = {
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.name = "leds-bcm6328",
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.of_match_table = bcm6328_leds_of_match,
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},
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};
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module_platform_driver(bcm6328_leds_driver);
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MODULE_AUTHOR("Álvaro Fernández Rojas <noltari@gmail.com>");
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MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
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MODULE_DESCRIPTION("LED driver for BCM6328 controllers");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:leds-bcm6328");
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