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![Simon Glass](/assets/img/avatar_default.png)
We use 'priv' for private data but often use 'platdata' for platform data. We can't really use 'pdata' since that is ambiguous (it could mean private or platform data). Rename some of the latter variables to end with 'plat' for consistency. Signed-off-by: Simon Glass <sjg@chromium.org>
253 lines
5.9 KiB
C
253 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019 Philippe Reynes <philippe.reynes@softathome.com>
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*
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* based on:
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* drivers/led/led_bcm6328.c
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* drivers/led/led_bcm6358.c
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <led.h>
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#include <log.h>
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#include <asm/io.h>
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#include <dm/lists.h>
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#include <linux/bitops.h>
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#define LEDS_MAX 32
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#define LEDS_WAIT 100
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/* LED Mode register */
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#define LED_MODE_REG 0x0
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#define LED_MODE_OFF 0
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#define LED_MODE_ON 1
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#define LED_MODE_MASK 1
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/* LED Controller Global settings register */
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#define LED_CTRL_REG 0x00
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#define LED_CTRL_MASK 0x1f
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#define LED_CTRL_LED_TEST_MODE BIT(0)
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#define LED_CTRL_SERIAL_LED_DATA_PPOL BIT(1)
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#define LED_CTRL_SERIAL_LED_CLK_POL BIT(2)
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#define LED_CTRL_SERIAL_LED_EN_POL BIT(3)
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#define LED_CTRL_SERIAL_LED_MSB_FIRST BIT(4)
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/* LED Controller IP LED source select register */
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#define LED_HW_LED_EN_REG 0x08
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/* LED Flash control register0 */
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#define LED_FLASH_RATE_CONTROL_REG0 0x10
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/* Soft LED input register */
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#define LED_SW_LED_IP_REG 0xb8
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/* Parallel LED Output Polarity Register */
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#define LED_PLED_OP_PPOL_REG 0xc0
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struct bcm6858_led_priv {
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void __iomem *regs;
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u8 pin;
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};
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#ifdef CONFIG_LED_BLINK
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/*
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* The value for flash rate are:
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* 0 : no blinking
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* 1 : rate is 25 Hz => 40 ms (period)
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* 2 : rate is 12.5 Hz => 80 ms (period)
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* 3 : rate is 6.25 Hz => 160 ms (period)
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* 4 : rate is 3.125 Hz => 320 ms (period)
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* 5 : rate is 1.5625 Hz => 640 ms (period)
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* 6 : rate is 0.7815 Hz => 1280 ms (period)
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* 7 : rate is 0.390625 Hz => 2560 ms (period)
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*/
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static const int bcm6858_flash_rate[8] = {
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0, 40, 80, 160, 320, 640, 1280, 2560
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};
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static u32 bcm6858_flash_rate_value(int period_ms)
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{
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unsigned long value = 7;
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int i;
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for (i = 0; i < ARRAY_SIZE(bcm6858_flash_rate); i++) {
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if (period_ms <= bcm6858_flash_rate[i]) {
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value = i;
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break;
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}
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}
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return value;
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}
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static int bcm6858_led_set_period(struct udevice *dev, int period_ms)
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{
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struct bcm6858_led_priv *priv = dev_get_priv(dev);
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u32 offset, shift, mask, value;
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offset = (priv->pin / 8) * 4;
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shift = (priv->pin % 8) * 4;
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mask = 0x7 << shift;
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value = bcm6858_flash_rate_value(period_ms) << shift;
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clrbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, mask);
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setbits_32(priv->regs + LED_FLASH_RATE_CONTROL_REG0 + offset, value);
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return 0;
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}
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#endif
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static enum led_state_t bcm6858_led_get_state(struct udevice *dev)
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{
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struct bcm6858_led_priv *priv = dev_get_priv(dev);
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enum led_state_t state = LEDST_OFF;
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u32 sw_led_ip;
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sw_led_ip = readl(priv->regs + LED_SW_LED_IP_REG);
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if (sw_led_ip & (1 << priv->pin))
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state = LEDST_ON;
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return state;
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}
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static int bcm6858_led_set_state(struct udevice *dev, enum led_state_t state)
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{
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struct bcm6858_led_priv *priv = dev_get_priv(dev);
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switch (state) {
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case LEDST_OFF:
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clrbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
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#ifdef CONFIG_LED_BLINK
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bcm6858_led_set_period(dev, 0);
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#endif
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break;
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case LEDST_ON:
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setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
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#ifdef CONFIG_LED_BLINK
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bcm6858_led_set_period(dev, 0);
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#endif
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break;
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case LEDST_TOGGLE:
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if (bcm6858_led_get_state(dev) == LEDST_OFF)
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return bcm6858_led_set_state(dev, LEDST_ON);
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else
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return bcm6858_led_set_state(dev, LEDST_OFF);
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break;
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#ifdef CONFIG_LED_BLINK
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case LEDST_BLINK:
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setbits_32(priv->regs + LED_SW_LED_IP_REG, (1 << priv->pin));
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break;
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#endif
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default:
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return -EINVAL;
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}
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return 0;
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}
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static const struct led_ops bcm6858_led_ops = {
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.get_state = bcm6858_led_get_state,
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.set_state = bcm6858_led_set_state,
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#ifdef CONFIG_LED_BLINK
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.set_period = bcm6858_led_set_period,
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#endif
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};
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static int bcm6858_led_probe(struct udevice *dev)
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{
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struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
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/* Top-level LED node */
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if (!uc_plat->label) {
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void __iomem *regs;
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u32 set_bits = 0;
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regs = dev_remap_addr(dev);
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if (!regs)
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return -EINVAL;
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if (dev_read_bool(dev, "brcm,serial-led-msb-first"))
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set_bits |= LED_CTRL_SERIAL_LED_MSB_FIRST;
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if (dev_read_bool(dev, "brcm,serial-led-en-pol"))
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set_bits |= LED_CTRL_SERIAL_LED_EN_POL;
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if (dev_read_bool(dev, "brcm,serial-led-clk-pol"))
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set_bits |= LED_CTRL_SERIAL_LED_CLK_POL;
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if (dev_read_bool(dev, "brcm,serial-led-data-ppol"))
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set_bits |= LED_CTRL_SERIAL_LED_DATA_PPOL;
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if (dev_read_bool(dev, "brcm,led-test-mode"))
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set_bits |= LED_CTRL_LED_TEST_MODE;
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clrsetbits_32(regs + LED_CTRL_REG, ~0, set_bits);
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} else {
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struct bcm6858_led_priv *priv = dev_get_priv(dev);
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void __iomem *regs;
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unsigned int pin;
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regs = dev_remap_addr(dev_get_parent(dev));
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if (!regs)
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return -EINVAL;
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pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
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if (pin >= LEDS_MAX)
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return -EINVAL;
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priv->regs = regs;
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priv->pin = pin;
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/* this led is managed by software */
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clrbits_32(regs + LED_HW_LED_EN_REG, 1 << pin);
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/* configure the polarity */
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if (dev_read_bool(dev, "active-low"))
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clrbits_32(regs + LED_PLED_OP_PPOL_REG, 1 << pin);
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else
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setbits_32(regs + LED_PLED_OP_PPOL_REG, 1 << pin);
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}
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return 0;
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}
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static int bcm6858_led_bind(struct udevice *parent)
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{
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ofnode node;
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dev_for_each_subnode(node, parent) {
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struct led_uc_plat *uc_plat;
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struct udevice *dev;
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const char *label;
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int ret;
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label = ofnode_read_string(node, "label");
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if (!label) {
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debug("%s: node %s has no label\n", __func__,
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ofnode_get_name(node));
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return -EINVAL;
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}
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ret = device_bind_driver_to_node(parent, "bcm6858-led",
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ofnode_get_name(node),
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node, &dev);
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if (ret)
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return ret;
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uc_plat = dev_get_uclass_plat(dev);
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uc_plat->label = label;
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}
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return 0;
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}
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static const struct udevice_id bcm6858_led_ids[] = {
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{ .compatible = "brcm,bcm6858-leds" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(bcm6858_led) = {
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.name = "bcm6858-led",
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.id = UCLASS_LED,
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.of_match = bcm6858_led_ids,
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.bind = bcm6858_led_bind,
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.probe = bcm6858_led_probe,
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.priv_auto = sizeof(struct bcm6858_led_priv),
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.ops = &bcm6858_led_ops,
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};
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