dm: led: add BCM6358 led driver

This driver is a simplified version of linux/drivers/leds/leds-bcm6358.c

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Álvaro Fernández Rojas 2017-05-07 20:11:30 +02:00 committed by Daniel Schwierzeck
parent 09e2a57150
commit 632889cfe5
4 changed files with 377 additions and 0 deletions

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@ -0,0 +1,141 @@
LEDs connected to Broadcom BCM6358 controller
This controller is present on BCM6358 and BCM6368.
In these SoCs there are Serial LEDs (LEDs connected to a 74x164 controller),
which can either be controlled by software (exporting the 74x164 as spi-gpio.
See Documentation/devicetree/bindings/gpio/gpio-74x164.txt), or
by hardware using this driver.
Required properties:
- compatible : should be "brcm,bcm6358-leds".
- #address-cells : must be 1.
- #size-cells : must be 0.
- reg : BCM6358 LED controller address and size.
Optional properties:
- brcm,clk-div : SCK signal divider. Possible values are 1, 2, 4 and 8.
Default : 1
- brcm,clk-dat-low : Boolean, makes clock and data signals active low.
Default : false
Each LED is represented as a sub-node of the brcm,bcm6358-leds device.
LED sub-node required properties:
- reg : LED pin number (only LEDs 0 to 31 are valid).
LED sub-node optional properties:
- label : see Documentation/devicetree/bindings/leds/common.txt
- active-low : Boolean, makes LED active low.
Default : false
Examples:
Scenario 1 : BCM6358
leds0: led-controller@fffe00d0 {
compatible = "brcm,bcm6358-leds";
#address-cells = <1>;
#size-cells = <0>;
reg = <0xfffe00d0 0x8>;
alarm_white {
reg = <0>;
active-low;
label = "white:alarm";
};
tv_white {
reg = <2>;
active-low;
label = "white:tv";
};
tel_white {
reg = <3>;
active-low;
label = "white:tel";
};
adsl_white {
reg = <4>;
active-low;
label = "white:adsl";
};
};
Scenario 2 : BCM6368
leds0: led-controller@100000d0 {
compatible = "brcm,bcm6358-leds";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x100000d0 0x8>;
brcm,pol-low;
brcm,clk-div = <4>;
power_red {
reg = <0>;
active-low;
label = "red:power";
};
power_green {
reg = <1>;
active-low;
label = "green:power";
default-state = "on";
};
power_blue {
reg = <2>;
label = "blue:power";
};
broadband_red {
reg = <3>;
active-low;
label = "red:broadband";
};
broadband_green {
reg = <4>;
label = "green:broadband";
};
broadband_blue {
reg = <5>;
active-low;
label = "blue:broadband";
};
wireless_red {
reg = <6>;
active-low;
label = "red:wireless";
};
wireless_green {
reg = <7>;
active-low;
label = "green:wireless";
};
wireless_blue {
reg = <8>;
label = "blue:wireless";
};
phone_red {
reg = <9>;
active-low;
label = "red:phone";
};
phone_green {
reg = <10>;
active-low;
label = "green:phone";
};
phone_blue {
reg = <11>;
label = "blue:phone";
};
upgrading_red {
reg = <12>;
active-low;
label = "red:upgrading";
};
upgrading_green {
reg = <13>;
active-low;
label = "green:upgrading";
};
upgrading_blue {
reg = <14>;
label = "blue:upgrading";
};
};

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@ -20,6 +20,14 @@ config LED_BCM6328
means that if one LED is set to blink at 100ms and then a different
LED is set to blink at 200ms, both will blink at 200ms.
config LED_BCM6358
bool "LED Support for BCM6358"
depends on LED && ARCH_BMIPS
help
This option enables support for LEDs connected to the BCM6358
LED HW controller accessed via MMIO registers.
HW has no blinking capabilities and up to 32 LEDs can be controlled.
config LED_BLINK
bool "Support LED blinking"
depends on LED

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@ -7,4 +7,5 @@
obj-y += led-uclass.o
obj-$(CONFIG_LED_BCM6328) += led_bcm6328.o
obj-$(CONFIG_LED_BCM6358) += led_bcm6358.o
obj-$(CONFIG_$(SPL_)LED_GPIO) += led_gpio.o

227
drivers/led/led_bcm6358.c Normal file
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/*
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <led.h>
#include <asm/io.h>
#include <dm/lists.h>
#define LEDS_MAX 32
#define LEDS_WAIT 100
/* LED Mode register */
#define LED_MODE_REG 0x0
#define LED_MODE_OFF 0
#define LED_MODE_ON 1
#define LED_MODE_MASK 1
/* LED Control register */
#define LED_CTRL_REG 0x4
#define LED_CTRL_CLK_MASK 0x3
#define LED_CTRL_CLK_1 0
#define LED_CTRL_CLK_2 1
#define LED_CTRL_CLK_4 2
#define LED_CTRL_CLK_8 3
#define LED_CTRL_POL_SHIFT 2
#define LED_CTRL_POL_MASK (1 << LED_CTRL_POL_SHIFT)
#define LED_CTRL_BUSY_SHIFT 3
#define LED_CTRL_BUSY_MASK (1 << LED_CTRL_BUSY_SHIFT)
DECLARE_GLOBAL_DATA_PTR;
struct bcm6358_led_priv {
void __iomem *regs;
uint8_t pin;
bool active_low;
};
static void bcm6358_led_busy(void __iomem *regs)
{
while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK)
udelay(LEDS_WAIT);
}
static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv)
{
bcm6358_led_busy(priv->regs);
return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) &
LED_MODE_MASK;
}
static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode)
{
bcm6358_led_busy(priv->regs);
clrsetbits_be32(priv->regs + LED_MODE_REG,
(LED_MODE_MASK << priv->pin),
(mode << priv->pin));
return 0;
}
static enum led_state_t bcm6358_led_get_state(struct udevice *dev)
{
struct bcm6358_led_priv *priv = dev_get_priv(dev);
enum led_state_t state = LEDST_OFF;
switch (bcm6358_led_get_mode(priv)) {
case LED_MODE_OFF:
state = (priv->active_low ? LEDST_ON : LEDST_OFF);
break;
case LED_MODE_ON:
state = (priv->active_low ? LEDST_OFF : LEDST_ON);
break;
}
return state;
}
static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state)
{
struct bcm6358_led_priv *priv = dev_get_priv(dev);
unsigned long mode;
switch (state) {
case LEDST_OFF:
mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
break;
case LEDST_ON:
mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
break;
case LEDST_TOGGLE:
if (bcm6358_led_get_state(dev) == LEDST_OFF)
return bcm6358_led_set_state(dev, LEDST_ON);
else
return bcm6358_led_set_state(dev, LEDST_OFF);
break;
default:
return -ENOSYS;
}
return bcm6358_led_set_mode(priv, mode);
}
static const struct led_ops bcm6358_led_ops = {
.get_state = bcm6358_led_get_state,
.set_state = bcm6358_led_set_state,
};
static int bcm6358_led_probe(struct udevice *dev)
{
struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
fdt_addr_t addr;
fdt_size_t size;
/* Top-level LED node */
if (!uc_plat->label) {
void __iomem *regs;
unsigned int clk_div;
u32 set_bits = 0;
addr = dev_get_addr_size_index(dev, 0, &size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
regs = ioremap(addr, size);
if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
"brcm,clk-dat-low"))
set_bits |= LED_CTRL_POL_MASK;
clk_div = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
"brcm,clk-div", LED_CTRL_CLK_1);
switch (clk_div) {
case 8:
set_bits |= LED_CTRL_CLK_8;
break;
case 4:
set_bits |= LED_CTRL_CLK_4;
break;
case 2:
set_bits |= LED_CTRL_CLK_2;
break;
default:
set_bits |= LED_CTRL_CLK_1;
break;
}
bcm6358_led_busy(regs);
clrsetbits_be32(regs + LED_CTRL_REG,
LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
set_bits);
} else {
struct bcm6358_led_priv *priv = dev_get_priv(dev);
unsigned int pin;
addr = dev_get_addr_size_index(dev_get_parent(dev), 0, &size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
pin = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), "reg",
LEDS_MAX);
if (pin >= LEDS_MAX)
return -EINVAL;
priv->regs = ioremap(addr, size);
priv->pin = pin;
if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
"active-low"))
priv->active_low = true;
}
return 0;
}
static int bcm6358_led_bind(struct udevice *parent)
{
const void *blob = gd->fdt_blob;
int node;
for (node = fdt_first_subnode(blob, dev_of_offset(parent));
node > 0;
node = fdt_next_subnode(blob, node)) {
struct led_uc_plat *uc_plat;
struct udevice *dev;
const char *label;
int ret;
label = fdt_getprop(blob, node, "label", NULL);
if (!label) {
debug("%s: node %s has no label\n", __func__,
fdt_get_name(blob, node, NULL));
return -EINVAL;
}
ret = device_bind_driver_to_node(parent, "bcm6358-led",
fdt_get_name(blob, node, NULL),
node, &dev);
if (ret)
return ret;
uc_plat = dev_get_uclass_platdata(dev);
uc_plat->label = label;
}
return 0;
}
static const struct udevice_id bcm6358_led_ids[] = {
{ .compatible = "brcm,bcm6358-leds" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(bcm6358_led) = {
.name = "bcm6358-led",
.id = UCLASS_LED,
.of_match = bcm6358_led_ids,
.bind = bcm6358_led_bind,
.probe = bcm6358_led_probe,
.priv_auto_alloc_size = sizeof(struct bcm6358_led_priv),
.ops = &bcm6358_led_ops,
};