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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <asm/mach-rtl838x/mach-rtl83xx.h>
/* RTL8231 registers for LED control */
#define RTL8231_LED_FUNC0 0x0000
#define RTL8231_GPIO_PIN_SEL(gpio) ((0x0002) + ((gpio) >> 4))
#define RTL8231_GPIO_DIR(gpio) ((0x0005) + ((gpio) >> 4))
#define RTL8231_GPIO_DATA(gpio) ((0x001C) + ((gpio) >> 4))
struct rtl838x_gpios {
struct gpio_chip gc;
u32 id;
struct device *dev;
int irq;
int num_leds;
int min_led;
int leds_per_port;
u32 led_mode;
int led_glb_ctrl;
int led_sw_ctrl;
int (*led_sw_p_ctrl)(int port);
int (*led_sw_p_en_ctrl)(int port);
int (*ext_gpio_dir)(int i);
int (*ext_gpio_data)(int i);
};
inline int rtl838x_ext_gpio_dir(int i)
{
return RTL838X_EXT_GPIO_DIR + ((i >>5) << 2);
}
inline int rtl839x_ext_gpio_dir(int i)
{
return RTL839X_EXT_GPIO_DIR + ((i >>5) << 2);
}
inline int rtl838x_ext_gpio_data(int i)
{
return RTL838X_EXT_GPIO_DATA + ((i >>5) << 2);
}
inline int rtl839x_ext_gpio_data(int i)
{
return RTL839X_EXT_GPIO_DATA + ((i >>5) << 2);
}
inline int rtl838x_led_sw_p_ctrl(int p)
{
return RTL838X_LED_SW_P_CTRL + (p << 2);
}
inline int rtl839x_led_sw_p_ctrl(int p)
{
return RTL839X_LED_SW_P_CTRL + (p << 2);
}
inline int rtl838x_led_sw_p_en_ctrl(int p)
{
return RTL838X_LED_SW_P_EN_CTRL + ((p / 10) << 2);
}
inline int rtl839x_led_sw_p_en_ctrl(int p)
{
return RTL839X_LED_SW_P_EN_CTRL + ((p / 10) << 2);
}
extern struct mutex smi_lock;
extern struct rtl83xx_soc_info soc_info;
void rtl838x_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
{
int bit;
struct rtl838x_gpios *gpios = gpiochip_get_data(gc);
pr_debug("rtl838x_set: %d, value: %d\n", offset, value);
/* Internal GPIO of the RTL8380 */
if (offset < 32) {
if (value)
rtl83xx_w32_mask(0, BIT(offset), RTL838X_GPIO_PABC_DATA);
else
rtl83xx_w32_mask(BIT(offset), 0, RTL838X_GPIO_PABC_DATA);
}
/* LED driver for PWR and SYS */
if (offset >= 32 && offset < 64) {
bit = offset - 32;
if (value)
sw_w32_mask(0, BIT(bit), gpios->led_glb_ctrl);
else
sw_w32_mask(BIT(bit), 0, gpios->led_glb_ctrl);
return;
}
bit = (offset - 64) % 32;
/* First Port-LED */
if (offset >= 64 && offset < 96
&& offset >= (64 + gpios->min_led)
&& offset < (64 + gpios->min_led + gpios->num_leds)) {
if (value)
sw_w32_mask(7, 5, gpios->led_sw_p_ctrl(bit));
else
sw_w32_mask(7, 0, gpios->led_sw_p_ctrl(bit));
}
if (offset >= 96 && offset < 128
&& offset >= (96 + gpios->min_led)
&& offset < (96 + gpios->min_led + gpios->num_leds)) {
if (value)
sw_w32_mask(7 << 3, 5 << 3, gpios->led_sw_p_ctrl(bit));
else
sw_w32_mask(7 << 3, 0, gpios->led_sw_p_ctrl(bit));
}
if (offset >= 128 && offset < 160
&& offset >= (128 + gpios->min_led)
&& offset < (128 + gpios->min_led + gpios->num_leds)) {
if (value)
sw_w32_mask(7 << 6, 5 << 6, gpios->led_sw_p_ctrl(bit));
else
sw_w32_mask(7 << 6, 0, gpios->led_sw_p_ctrl(bit));
}
__asm__ volatile ("sync");
}
static int rtl838x_direction_input(struct gpio_chip *gc, unsigned int offset)
{
pr_debug("%s: %d\n", __func__, offset);
if (offset < 32) {
rtl83xx_w32_mask(BIT(offset), 0, RTL838X_GPIO_PABC_DIR);
return 0;
}
/* Internal LED driver does not support input */
return -ENOTSUPP;
}
static int rtl838x_direction_output(struct gpio_chip *gc, unsigned int offset, int value)
{
pr_debug("%s: %d\n", __func__, offset);
if (offset < 32)
rtl83xx_w32_mask(0, BIT(offset), RTL838X_GPIO_PABC_DIR);
rtl838x_gpio_set(gc, offset, value);
/* LED for PWR and SYS driver is direction output by default */
return 0;
}
static int rtl838x_get_direction(struct gpio_chip *gc, unsigned int offset)
{
u32 v = 0;
pr_debug("%s: %d\n", __func__, offset);
if (offset < 32) {
v = rtl83xx_r32(RTL838X_GPIO_PABC_DIR);
if (v & BIT(offset))
return 0;
return 1;
}
/* LED driver for PWR and SYS is direction output by default */
if (offset >= 32 && offset < 64)
return 0;
return 0;
}
static int rtl838x_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
u32 v;
struct rtl838x_gpios *gpios = gpiochip_get_data(gc);
pr_debug("%s: %d\n", __func__, offset);
/* Internal GPIO of the RTL8380 */
if (offset < 32) {
v = rtl83xx_r32(RTL838X_GPIO_PABC_DATA);
if (v & BIT(offset))
return 1;
return 0;
}
/* LED driver for PWR and SYS */
if (offset >= 32 && offset < 64) {
v = sw_r32(gpios->led_glb_ctrl);
if (v & BIT(offset-32))
return 1;
return 0;
}
/* BUG:
bit = (offset - 64) % 32;
if (offset >= 64 && offset < 96) {
if (sw_r32(RTL838X_LED1_SW_P_EN_CTRL) & BIT(bit))
return 1;
return 0;
}
if (offset >= 96 && offset < 128) {
if (sw_r32(RTL838X_LED1_SW_P_EN_CTRL) & BIT(bit))
return 1;
return 0;
}
if (offset >= 128 && offset < 160) {
if (sw_r32(RTL838X_LED1_SW_P_EN_CTRL) & BIT(bit))
return 1;
return 0;
}
*/
return 0;
}
void rtl8380_led_test(struct rtl838x_gpios *gpios, u32 mask)
{
int i;
u32 led_gbl = sw_r32(gpios->led_glb_ctrl);
u32 mode_sel, led_p_en;
if (soc_info.family == RTL8380_FAMILY_ID) {
mode_sel = sw_r32(RTL838X_LED_MODE_SEL);
led_p_en = sw_r32(RTL838X_LED_P_EN_CTRL);
}
/* 2 Leds for ports 0-23 and 24-27, 3 would be 0x7 */
sw_w32_mask(0x3f, 0x3 | (0x3 << 3), gpios->led_glb_ctrl);
if(soc_info.family == RTL8380_FAMILY_ID) {
/* Enable all leds */
sw_w32(0xFFFFFFF, RTL838X_LED_P_EN_CTRL);
}
/* Enable software control of all leds */
sw_w32(0xFFFFFFF, gpios->led_sw_ctrl);
sw_w32(0xFFFFFFF, gpios->led_sw_p_en_ctrl(0));
sw_w32(0xFFFFFFF, gpios->led_sw_p_en_ctrl(10));
sw_w32(0x0000000, gpios->led_sw_p_en_ctrl(20));
for (i = 0; i < 28; i++) {
if (mask & BIT(i))
sw_w32(5 | (5 << 3) | (5 << 6), gpios->led_sw_p_ctrl(i));
}
msleep(3000);
if (soc_info.family == RTL8380_FAMILY_ID)
sw_w32(led_p_en, RTL838X_LED_P_EN_CTRL);
/* Disable software control of all leds */
sw_w32(0x0000000, gpios->led_sw_ctrl);
sw_w32(0x0000000, gpios->led_sw_p_en_ctrl(0));
sw_w32(0x0000000, gpios->led_sw_p_en_ctrl(10));
sw_w32(0x0000000, gpios->led_sw_p_en_ctrl(20));
sw_w32(led_gbl, gpios->led_glb_ctrl);
if (soc_info.family == RTL8380_FAMILY_ID)
sw_w32(mode_sel, RTL838X_LED_MODE_SEL);
}
void take_port_leds(struct rtl838x_gpios *gpios)
{
int leds_per_port = gpios->leds_per_port;
int mode = gpios->led_mode;
pr_info("%s, %d, %x\n", __func__, leds_per_port, mode);
pr_debug("Bootloader settings: %x %x %x\n",
sw_r32(gpios->led_sw_p_en_ctrl(0)),
sw_r32(gpios->led_sw_p_en_ctrl(10)),
sw_r32(gpios->led_sw_p_en_ctrl(20))
);
if (soc_info.family == RTL8380_FAMILY_ID) {
pr_debug("led glb: %x, sel %x\n",
sw_r32(gpios->led_glb_ctrl), sw_r32(RTL838X_LED_MODE_SEL));
pr_debug("RTL838X_LED_P_EN_CTRL: %x", sw_r32(RTL838X_LED_P_EN_CTRL));
pr_debug("RTL838X_LED_MODE_CTRL: %x", sw_r32(RTL838X_LED_MODE_CTRL));
sw_w32_mask(3, 0, RTL838X_LED_MODE_SEL);
sw_w32(mode, RTL838X_LED_MODE_CTRL);
}
/* Enable software control of all leds */
sw_w32(0xFFFFFFF, gpios->led_sw_ctrl);
if (soc_info.family == RTL8380_FAMILY_ID)
sw_w32(0xFFFFFFF, RTL838X_LED_P_EN_CTRL);
sw_w32(0x0000000, gpios->led_sw_p_en_ctrl(0));
sw_w32(0x0000000, gpios->led_sw_p_en_ctrl(10));
sw_w32(0x0000000, gpios->led_sw_p_en_ctrl(20));
sw_w32_mask(0x3f, 0, gpios->led_glb_ctrl);
switch (leds_per_port) {
case 3:
sw_w32_mask(0, 0x7 | (0x7 << 3), gpios->led_glb_ctrl);
sw_w32(0xFFFFFFF, gpios->led_sw_p_en_ctrl(20));
/* FALLTHRU */
case 2:
sw_w32_mask(0, 0x3 | (0x3 << 3), gpios->led_glb_ctrl);
sw_w32(0xFFFFFFF, gpios->led_sw_p_en_ctrl(10));
/* FALLTHRU */
case 1:
sw_w32_mask(0, 0x1 | (0x1 << 3), gpios->led_glb_ctrl);
sw_w32(0xFFFFFFF, gpios->led_sw_p_en_ctrl(0));
break;
default:
pr_err("No LEDS configured for software control\n");
}
}
static const struct of_device_id rtl838x_gpio_of_match[] = {
{ .compatible = "realtek,rtl838x-gpio" },
{},
};
MODULE_DEVICE_TABLE(of, rtl838x_gpio_of_match);
static int rtl838x_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct rtl838x_gpios *gpios;
int err;
pr_info("Probing RTL838X GPIOs\n");
if (!np) {
dev_err(&pdev->dev, "No DT found\n");
return -EINVAL;
}
gpios = devm_kzalloc(dev, sizeof(*gpios), GFP_KERNEL);
if (!gpios)
return -ENOMEM;
gpios->id = soc_info.id;
switch (gpios->id) {
case 0x8332:
pr_debug("Found RTL8332M GPIO\n");
break;
case 0x8380:
pr_debug("Found RTL8380M GPIO\n");
break;
case 0x8381:
pr_debug("Found RTL8381M GPIO\n");
break;
case 0x8382:
pr_debug("Found RTL8382M GPIO\n");
break;
case 0x8391:
pr_debug("Found RTL8391 GPIO\n");
break;
case 0x8393:
pr_debug("Found RTL8393 GPIO\n");
break;
default:
pr_err("Unknown GPIO chip id (%04x)\n", gpios->id);
return -ENODEV;
}
if (soc_info.family == RTL8380_FAMILY_ID) {
gpios->led_glb_ctrl = RTL838X_LED_GLB_CTRL;
gpios->led_sw_ctrl = RTL838X_LED_SW_CTRL;
gpios->led_sw_p_ctrl = rtl838x_led_sw_p_ctrl;
gpios->led_sw_p_en_ctrl = rtl838x_led_sw_p_en_ctrl;
gpios->ext_gpio_dir = rtl838x_ext_gpio_dir;
gpios->ext_gpio_data = rtl838x_ext_gpio_data;
}
if (soc_info.family == RTL8390_FAMILY_ID) {
gpios->led_glb_ctrl = RTL839X_LED_GLB_CTRL;
gpios->led_sw_ctrl = RTL839X_LED_SW_CTRL;
gpios->led_sw_p_ctrl = rtl839x_led_sw_p_ctrl;
gpios->led_sw_p_en_ctrl = rtl839x_led_sw_p_en_ctrl;
gpios->ext_gpio_dir = rtl839x_ext_gpio_dir;
gpios->ext_gpio_data = rtl839x_ext_gpio_data;
}
gpios->dev = dev;
gpios->gc.base = 0;
/* 0-31: internal
* 32-63, LED control register
* 64-95: PORT-LED 0
* 96-127: PORT-LED 1
* 128-159: PORT-LED 2
*/
gpios->gc.ngpio = 160;
gpios->gc.label = "rtl838x";
gpios->gc.parent = dev;
gpios->gc.owner = THIS_MODULE;
gpios->gc.can_sleep = true;
gpios->irq = 31;
gpios->gc.direction_input = rtl838x_direction_input;
gpios->gc.direction_output = rtl838x_direction_output;
gpios->gc.set = rtl838x_gpio_set;
gpios->gc.get = rtl838x_gpio_get;
gpios->gc.get_direction = rtl838x_get_direction;
if (of_property_read_bool(np, "take-port-leds")) {
if (of_property_read_u32(np, "leds-per-port", &gpios->leds_per_port))
gpios->leds_per_port = 2;
if (of_property_read_u32(np, "led-mode", &gpios->led_mode))
gpios->led_mode = (0x1ea << 15) | 0x1ea;
if (of_property_read_u32(np, "num-leds", &gpios->num_leds))
gpios->num_leds = 32;
if (of_property_read_u32(np, "min-led", &gpios->min_led))
gpios->min_led = 0;
take_port_leds(gpios);
}
err = devm_gpiochip_add_data(dev, &gpios->gc, gpios);
return err;
}
static struct platform_driver rtl838x_gpio_driver = {
.driver = {
.name = "rtl838x-gpio",
.of_match_table = rtl838x_gpio_of_match,
},
.probe = rtl838x_gpio_probe,
};
module_platform_driver(rtl838x_gpio_driver);
MODULE_DESCRIPTION("Realtek RTL838X GPIO API support");
MODULE_LICENSE("GPL v2");
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