diff options
Diffstat (limited to 'target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c')
| -rw-r--r-- | target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c | 355 |
1 files changed, 0 insertions, 355 deletions
diff --git a/target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c b/target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c deleted file mode 100644 index 368c4fa60f..0000000000 --- a/target/linux/realtek/files-5.10/drivers/gpio/gpio-rtl8231.c +++ /dev/null @@ -1,355 +0,0 @@ -// 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_LED_FUNC1 0x0001 -#define RTL8231_READY_MASK 0x03f0 -#define RTL8231_READY_VALUE 0x0370 -#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)) - -#define USEC_TIMEOUT 5000 - -#define RTL8231_SMI_BUS_ID_MAX 0x1F - -struct rtl8231_gpios { - struct gpio_chip gc; - struct device *dev; - u32 id; - u32 smi_bus_id; - u16 reg_shadow[0x20]; - u32 reg_cached; - int ext_gpio_indrt_access; -}; - -extern struct rtl83xx_soc_info soc_info; - -DEFINE_MUTEX(miim_lock); - -static u32 rtl8231_read(struct rtl8231_gpios *gpios, u32 reg) -{ - u32 t = 0, n = 0; - - reg &= 0x1f; - - /* Calculate read register address */ - t = (gpios->smi_bus_id << 2) | (reg << 7); - - /* Set execution bit: cleared when operation completed */ - t |= 1; - - // Start execution - sw_w32(t, gpios->ext_gpio_indrt_access); - do { - udelay(1); - t = sw_r32(gpios->ext_gpio_indrt_access); - n++; - } while ((t & 1) && (n < USEC_TIMEOUT)); - - if (n >= USEC_TIMEOUT) - return 0x80000000; - - pr_debug("%s: %x, %x, %x\n", __func__, gpios->smi_bus_id, - reg, (t & 0xffff0000) >> 16); - - return (t & 0xffff0000) >> 16; -} - -static int rtl8231_write(struct rtl8231_gpios *gpios, u32 reg, u32 data) -{ - u32 t = 0, n = 0; - - pr_debug("%s: %x, %x, %x\n", __func__, gpios->smi_bus_id, reg, data); - reg &= 0x1f; - - t = (gpios->smi_bus_id << 2) | (reg << 7) | (data << 16); - /* Set write bit */ - t |= 2; - - /* Set execution bit: cleared when operation completed */ - t |= 1; - - // Start execution - sw_w32(t, gpios->ext_gpio_indrt_access); - do { - udelay(1); - t = sw_r32(gpios->ext_gpio_indrt_access); - } while ((t & 1) && (n < USEC_TIMEOUT)); - - if (n >= USEC_TIMEOUT) - return -1; - - return 0; -} - -static u32 rtl8231_read_cached(struct rtl8231_gpios *gpios, u32 reg) -{ - if (reg > 0x1f) - return 0; - - if (gpios->reg_cached & (1 << reg)) - return gpios->reg_shadow[reg]; - - return rtl8231_read(gpios, reg); -} - -/* Set Direction of the RTL8231 pin: - * dir 1: input - * dir 0: output - */ -static int rtl8231_pin_dir(struct rtl8231_gpios *gpios, u32 gpio, u32 dir) -{ - u32 v; - int pin_sel_addr = RTL8231_GPIO_PIN_SEL(gpio); - int pin_dir_addr = RTL8231_GPIO_DIR(gpio); - int dpin = gpio % 16; - - if (gpio > 31) { - pr_debug("WARNING: HIGH pin\n"); - dpin += 5; - pin_dir_addr = pin_sel_addr; - } - - v = rtl8231_read_cached(gpios, pin_dir_addr); - if (v & 0x80000000) { - pr_err("Error reading RTL8231\n"); - return -1; - } - - v = (v & ~(1 << dpin)) | (dir << dpin); - rtl8231_write(gpios, pin_dir_addr, v); - gpios->reg_shadow[pin_dir_addr] = v; - gpios->reg_cached |= 1 << pin_dir_addr; - return 0; -} - -static int rtl8231_pin_dir_get(struct rtl8231_gpios *gpios, u32 gpio, u32 *dir) -{ - /* dir 1: input - * dir 0: output - */ - - u32 v; - int pin_dir_addr = RTL8231_GPIO_DIR(gpio); - int pin = gpio % 16; - - if (gpio > 31) { - pin_dir_addr = RTL8231_GPIO_PIN_SEL(gpio); - pin += 5; - } - - v = rtl8231_read(gpios, pin_dir_addr); - if (v & (1 << pin)) - *dir = 1; - else - *dir = 0; - return 0; -} - -static int rtl8231_pin_set(struct rtl8231_gpios *gpios, u32 gpio, u32 data) -{ - u32 v = rtl8231_read(gpios, RTL8231_GPIO_DATA(gpio)); - - pr_debug("%s: %d to %d\n", __func__, gpio, data); - if (v & 0x80000000) { - pr_err("Error reading RTL8231\n"); - return -1; - } - v = (v & ~(1 << (gpio % 16))) | (data << (gpio % 16)); - rtl8231_write(gpios, RTL8231_GPIO_DATA(gpio), v); - gpios->reg_shadow[RTL8231_GPIO_DATA(gpio)] = v; - gpios->reg_cached |= 1 << RTL8231_GPIO_DATA(gpio); - return 0; -} - -static int rtl8231_pin_get(struct rtl8231_gpios *gpios, u32 gpio, u16 *state) -{ - u32 v = rtl8231_read(gpios, RTL8231_GPIO_DATA(gpio)); - - if (v & 0x80000000) { - pr_err("Error reading RTL8231\n"); - return -1; - } - - *state = v & 0xffff; - return 0; -} - -static int rtl8231_direction_input(struct gpio_chip *gc, unsigned int offset) -{ - int err; - struct rtl8231_gpios *gpios = gpiochip_get_data(gc); - - pr_debug("%s: %d\n", __func__, offset); - mutex_lock(&miim_lock); - err = rtl8231_pin_dir(gpios, offset, 1); - mutex_unlock(&miim_lock); - return err; -} - -static int rtl8231_direction_output(struct gpio_chip *gc, unsigned int offset, int value) -{ - int err; - struct rtl8231_gpios *gpios = gpiochip_get_data(gc); - - pr_debug("%s: %d\n", __func__, offset); - mutex_lock(&miim_lock); - err = rtl8231_pin_dir(gpios, offset, 0); - mutex_unlock(&miim_lock); - if (!err) - err = rtl8231_pin_set(gpios, offset, value); - return err; -} - -static int rtl8231_get_direction(struct gpio_chip *gc, unsigned int offset) -{ - u32 v = 0; - struct rtl8231_gpios *gpios = gpiochip_get_data(gc); - - pr_debug("%s: %d\n", __func__, offset); - mutex_lock(&miim_lock); - rtl8231_pin_dir_get(gpios, offset, &v); - mutex_unlock(&miim_lock); - return v; -} - -static int rtl8231_gpio_get(struct gpio_chip *gc, unsigned int offset) -{ - u16 state = 0; - struct rtl8231_gpios *gpios = gpiochip_get_data(gc); - - mutex_lock(&miim_lock); - rtl8231_pin_get(gpios, offset, &state); - mutex_unlock(&miim_lock); - if (state & (1 << (offset % 16))) - return 1; - return 0; -} - -void rtl8231_gpio_set(struct gpio_chip *gc, unsigned int offset, int value) -{ - struct rtl8231_gpios *gpios = gpiochip_get_data(gc); - - rtl8231_pin_set(gpios, offset, value); -} - -int rtl8231_init(struct rtl8231_gpios *gpios) -{ - u32 ret; - - pr_info("%s called, MDIO bus ID: %d\n", __func__, gpios->smi_bus_id); - - gpios->reg_cached = 0; - - if (soc_info.family == RTL8390_FAMILY_ID) { - // RTL8390: Enable external gpio in global led control register - sw_w32_mask(0x7 << 18, 0x4 << 18, RTL839X_LED_GLB_CTRL); - } else if (soc_info.family == RTL8380_FAMILY_ID) { - // RTL8380: Enable RTL8231 indirect access mode - sw_w32_mask(0, 1, RTL838X_EXTRA_GPIO_CTRL); - sw_w32_mask(3, 1, RTL838X_DMY_REG5); - } - - ret = rtl8231_read(gpios, RTL8231_LED_FUNC1); - if ((ret & 0x80000000) || ((ret & RTL8231_READY_MASK) != RTL8231_READY_VALUE)) - return -ENXIO; - - /* Select GPIO functionality and force input direction for pins 0-36 */ - rtl8231_write(gpios, RTL8231_GPIO_PIN_SEL(0), 0xffff); - rtl8231_write(gpios, RTL8231_GPIO_DIR(0), 0xffff); - rtl8231_write(gpios, RTL8231_GPIO_PIN_SEL(16), 0xffff); - rtl8231_write(gpios, RTL8231_GPIO_DIR(16), 0xffff); - rtl8231_write(gpios, RTL8231_GPIO_PIN_SEL(32), 0x03ff); - - /* Set LED_Start to enable drivers for output mode */ - rtl8231_write(gpios, RTL8231_LED_FUNC0, 1 << 1); - - return 0; -} - -static const struct of_device_id rtl8231_gpio_of_match[] = { - { .compatible = "realtek,rtl8231-gpio" }, - {}, -}; - -MODULE_DEVICE_TABLE(of, rtl8231_gpio_of_match); - -static int rtl8231_gpio_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct device_node *np = dev->of_node; - struct rtl8231_gpios *gpios; - int err; - - pr_info("Probing RTL8231 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; - if (soc_info.family == RTL8380_FAMILY_ID) { - gpios->ext_gpio_indrt_access = RTL838X_EXT_GPIO_INDRT_ACCESS; - } - - if (soc_info.family == RTL8390_FAMILY_ID) { - gpios->ext_gpio_indrt_access = RTL839X_EXT_GPIO_INDRT_ACCESS; - } - - err = of_property_read_u32(np, "indirect-access-bus-id", &gpios->smi_bus_id); - if (!err && gpios->smi_bus_id > RTL8231_SMI_BUS_ID_MAX) - err = -EINVAL; - - if (err) { - dev_err(dev, "invalid or missing indirect-access-bus-id\n"); - return err; - } - - err = rtl8231_init(gpios); - if (err) { - dev_err(dev, "no device found at bus address %d\n", gpios->smi_bus_id); - return err; - } - - gpios->dev = dev; - gpios->gc.base = -1; - gpios->gc.ngpio = 37; - gpios->gc.label = "rtl8231"; - gpios->gc.parent = dev; - gpios->gc.owner = THIS_MODULE; - gpios->gc.can_sleep = true; - - gpios->gc.direction_input = rtl8231_direction_input; - gpios->gc.direction_output = rtl8231_direction_output; - gpios->gc.set = rtl8231_gpio_set; - gpios->gc.get = rtl8231_gpio_get; - gpios->gc.get_direction = rtl8231_get_direction; - - err = devm_gpiochip_add_data(dev, &gpios->gc, gpios); - return err; -} - -static struct platform_driver rtl8231_gpio_driver = { - .driver = { - .name = "rtl8231-gpio", - .of_match_table = rtl8231_gpio_of_match, - }, - .probe = rtl8231_gpio_probe, -}; - -module_platform_driver(rtl8231_gpio_driver); - -MODULE_DESCRIPTION("Realtek RTL8231 GPIO expansion chip support"); -MODULE_LICENSE("GPL v2"); |