diff options
Diffstat (limited to 'drivers/net/dsa/qca/qca8k-leds.c')
| -rw-r--r-- | drivers/net/dsa/qca/qca8k-leds.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/drivers/net/dsa/qca/qca8k-leds.c b/drivers/net/dsa/qca/qca8k-leds.c new file mode 100644 index 000000000000..0146ee12d34c --- /dev/null +++ b/drivers/net/dsa/qca/qca8k-leds.c @@ -0,0 +1,239 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/regmap.h> +#include <net/dsa.h> + +#include "qca8k.h" +#include "qca8k_leds.h" + +static int +qca8k_get_enable_led_reg(int port_num, int led_num, struct qca8k_led_pattern_en *reg_info) +{ + switch (port_num) { + case 0: + reg_info->reg = QCA8K_LED_CTRL_REG(led_num); + reg_info->shift = QCA8K_LED_PHY0123_CONTROL_RULE_SHIFT; + break; + case 1: + case 2: + case 3: + /* Port 123 are controlled on a different reg */ + reg_info->reg = QCA8K_LED_CTRL3_REG; + reg_info->shift = QCA8K_LED_PHY123_PATTERN_EN_SHIFT(port_num, led_num); + break; + case 4: + reg_info->reg = QCA8K_LED_CTRL_REG(led_num); + reg_info->shift = QCA8K_LED_PHY4_CONTROL_RULE_SHIFT; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int +qca8k_led_brightness_set(struct qca8k_led *led, + enum led_brightness brightness) +{ + struct qca8k_led_pattern_en reg_info; + struct qca8k_priv *priv = led->priv; + u32 mask, val; + + qca8k_get_enable_led_reg(led->port_num, led->led_num, ®_info); + + val = QCA8K_LED_ALWAYS_OFF; + if (brightness) + val = QCA8K_LED_ALWAYS_ON; + + /* HW regs to control brightness is special and port 1-2-3 + * are placed in a different reg. + * + * To control port 0 brightness: + * - the 2 bit (15, 14) of: + * - QCA8K_LED_CTRL0_REG for led1 + * - QCA8K_LED_CTRL1_REG for led2 + * - QCA8K_LED_CTRL2_REG for led3 + * + * To control port 4: + * - the 2 bit (31, 30) of: + * - QCA8K_LED_CTRL0_REG for led1 + * - QCA8K_LED_CTRL1_REG for led2 + * - QCA8K_LED_CTRL2_REG for led3 + * + * To control port 1: + * - the 2 bit at (9, 8) of QCA8K_LED_CTRL3_REG are used for led1 + * - the 2 bit at (11, 10) of QCA8K_LED_CTRL3_REG are used for led2 + * - the 2 bit at (13, 12) of QCA8K_LED_CTRL3_REG are used for led3 + * + * To control port 2: + * - the 2 bit at (15, 14) of QCA8K_LED_CTRL3_REG are used for led1 + * - the 2 bit at (17, 16) of QCA8K_LED_CTRL3_REG are used for led2 + * - the 2 bit at (19, 18) of QCA8K_LED_CTRL3_REG are used for led3 + * + * To control port 3: + * - the 2 bit at (21, 20) of QCA8K_LED_CTRL3_REG are used for led1 + * - the 2 bit at (23, 22) of QCA8K_LED_CTRL3_REG are used for led2 + * - the 2 bit at (25, 24) of QCA8K_LED_CTRL3_REG are used for led3 + * + * To abstract this and have less code, we use the port and led numm + * to calculate the shift and the correct reg due to this problem of + * not having a 1:1 map of LED with the regs. + */ + if (led->port_num == 0 || led->port_num == 4) { + mask = QCA8K_LED_PATTERN_EN_MASK; + val <<= QCA8K_LED_PATTERN_EN_SHIFT; + } else { + mask = QCA8K_LED_PHY123_PATTERN_EN_MASK; + } + + return regmap_update_bits(priv->regmap, reg_info.reg, + mask << reg_info.shift, + val << reg_info.shift); +} + +static int +qca8k_cled_brightness_set_blocking(struct led_classdev *ldev, + enum led_brightness brightness) +{ + struct qca8k_led *led = container_of(ldev, struct qca8k_led, cdev); + + return qca8k_led_brightness_set(led, brightness); +} + +static enum led_brightness +qca8k_led_brightness_get(struct qca8k_led *led) +{ + struct qca8k_led_pattern_en reg_info; + struct qca8k_priv *priv = led->priv; + u32 val; + int ret; + + qca8k_get_enable_led_reg(led->port_num, led->led_num, ®_info); + + ret = regmap_read(priv->regmap, reg_info.reg, &val); + if (ret) + return 0; + + val >>= reg_info.shift; + + if (led->port_num == 0 || led->port_num == 4) { + val &= QCA8K_LED_PATTERN_EN_MASK; + val >>= QCA8K_LED_PATTERN_EN_SHIFT; + } else { + val &= QCA8K_LED_PHY123_PATTERN_EN_MASK; + } + + /* Assume brightness ON only when the LED is set to always ON */ + return val == QCA8K_LED_ALWAYS_ON; +} + +static int +qca8k_parse_port_leds(struct qca8k_priv *priv, struct fwnode_handle *port, int port_num) +{ + struct fwnode_handle *led = NULL, *leds = NULL; + struct led_init_data init_data = { }; + struct dsa_switch *ds = priv->ds; + enum led_default_state state; + struct qca8k_led *port_led; + int led_num, led_index; + int ret; + + leds = fwnode_get_named_child_node(port, "leds"); + if (!leds) { + dev_dbg(priv->dev, "No Leds node specified in device tree for port %d!\n", + port_num); + return 0; + } + + fwnode_for_each_child_node(leds, led) { + /* Reg represent the led number of the port. + * Each port can have at most 3 leds attached + * Commonly: + * 1. is gigabit led + * 2. is mbit led + * 3. additional status led + */ + if (fwnode_property_read_u32(led, "reg", &led_num)) + continue; + + if (led_num >= QCA8K_LED_PORT_COUNT) { + dev_warn(priv->dev, "Invalid LED reg %d defined for port %d", + led_num, port_num); + continue; + } + + led_index = QCA8K_LED_PORT_INDEX(port_num, led_num); + + port_led = &priv->ports_led[led_index]; + port_led->port_num = port_num; + port_led->led_num = led_num; + port_led->priv = priv; + + state = led_init_default_state_get(led); + switch (state) { + case LEDS_DEFSTATE_ON: + port_led->cdev.brightness = 1; + qca8k_led_brightness_set(port_led, 1); + break; + case LEDS_DEFSTATE_KEEP: + port_led->cdev.brightness = + qca8k_led_brightness_get(port_led); + break; + default: + port_led->cdev.brightness = 0; + qca8k_led_brightness_set(port_led, 0); + } + + port_led->cdev.max_brightness = 1; + port_led->cdev.brightness_set_blocking = qca8k_cled_brightness_set_blocking; + init_data.default_label = ":port"; + init_data.fwnode = led; + init_data.devname_mandatory = true; + init_data.devicename = kasprintf(GFP_KERNEL, "%s:0%d", ds->slave_mii_bus->id, + port_num); + if (!init_data.devicename) + return -ENOMEM; + + ret = devm_led_classdev_register_ext(priv->dev, &port_led->cdev, &init_data); + if (ret) + dev_warn(priv->dev, "Failed to init LED %d for port %d", led_num, port_num); + + kfree(init_data.devicename); + } + + return 0; +} + +int +qca8k_setup_led_ctrl(struct qca8k_priv *priv) +{ + struct fwnode_handle *ports, *port; + int port_num; + int ret; + + ports = device_get_named_child_node(priv->dev, "ports"); + if (!ports) { + dev_info(priv->dev, "No ports node specified in device tree!"); + return 0; + } + + fwnode_for_each_child_node(ports, port) { + if (fwnode_property_read_u32(port, "reg", &port_num)) + continue; + + /* Skip checking for CPU port 0 and CPU port 6 as not supported */ + if (port_num == 0 || port_num == 6) + continue; + + /* Each port can have at most 3 different leds attached. + * Switch port starts from 0 to 6, but port 0 and 6 are CPU + * port. The port index needs to be decreased by one to identify + * the correct port for LED setup. + */ + ret = qca8k_parse_port_leds(priv, port, qca8k_port_to_phy(port_num)); + if (ret) + return ret; + } + + return 0; +} |