mt76: mt7915: add LED support

Initialize brightness_set and blink_set callbacks to enable LED support.
The base 0x7c000000 is MCU space so driver can't touch it, and should
map the LED base to 0x18000000 host's view.
Signed-off-by: MeiChia Chiu <meichia.chiu@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Money Wang <money.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/init.c

@@ -187,6 +187,64 @@ static int mt7915_thermal_init(struct mt7915_phy *phy)
 	return 0;
 }
 
+static void mt7915_led_set_config(struct led_classdev *led_cdev,
+				  u8 delay_on, u8 delay_off)
+{
+	struct mt7915_dev *dev;
+	struct mt76_dev *mt76;
+	u32 val;
+
+	mt76 = container_of(led_cdev, struct mt76_dev, led_cdev);
+	dev = container_of(mt76, struct mt7915_dev, mt76);
+
+	/* select TX blink mode, 2: only data frames */
+	mt76_rmw_field(dev, MT_TMAC_TCR0(0), MT_TMAC_TCR0_TX_BLINK, 2);
+
+	/* enable LED */
+	mt76_wr(dev, MT_LED_EN(0), 1);
+
+	/* set LED Tx blink on/off time */
+	val = FIELD_PREP(MT_LED_TX_BLINK_ON_MASK, delay_on) |
+	      FIELD_PREP(MT_LED_TX_BLINK_OFF_MASK, delay_off);
+	mt76_wr(dev, MT_LED_TX_BLINK(0), val);
+
+	/* control LED */
+	val = MT_LED_CTRL_BLINK_MODE | MT_LED_CTRL_KICK;
+	if (dev->mt76.led_al)
+		val |= MT_LED_CTRL_POLARITY;
+
+	mt76_wr(dev, MT_LED_CTRL(0), val);
+	mt76_clear(dev, MT_LED_CTRL(0), MT_LED_CTRL_KICK);
+}
+
+static int mt7915_led_set_blink(struct led_classdev *led_cdev,
+				unsigned long *delay_on,
+				unsigned long *delay_off)
+{
+	u16 delta_on = 0, delta_off = 0;
+
+#define HW_TICK		10
+#define TO_HW_TICK(_t)	(((_t) > HW_TICK) ? ((_t) / HW_TICK) : HW_TICK)
+
+	if (*delay_on)
+		delta_on = TO_HW_TICK(*delay_on);
+	if (*delay_off)
+		delta_off = TO_HW_TICK(*delay_off);
+
+	mt7915_led_set_config(led_cdev, delta_on, delta_off);
+
+	return 0;
+}
+
+static void mt7915_led_set_brightness(struct led_classdev *led_cdev,
+				      enum led_brightness brightness)
+{
+	if (!brightness)
+		mt7915_led_set_config(led_cdev, 0, 0xff);
+	else
+		mt7915_led_set_config(led_cdev, 0xff, 0);
+}
+
 static void
 mt7915_init_txpower(struct mt7915_dev *dev,
 		    struct ieee80211_supported_band *sband)
@@ -341,6 +399,11 @@ static void mt7915_mac_init(struct mt7915_dev *dev)
 				       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
 	for (i = 0; i < 2; i++)
 		mt7915_mac_init_band(dev, i);
+
+	if (IS_ENABLED(CONFIG_MT76_LEDS)) {
+		i = dev->mt76.led_pin ? MT_LED_GPIO_MUX3 : MT_LED_GPIO_MUX2;
+		mt76_rmw_field(dev, i, MT_LED_GPIO_SEL_MASK, 4);
+	}
 }
 
 static int mt7915_txbf_init(struct mt7915_dev *dev)
@@ -855,6 +918,12 @@ int mt7915_register_device(struct mt7915_dev *dev)
 	dev->mt76.test_ops = &mt7915_testmode_ops;
 #endif
 
+	/* init led callbacks */
+	if (IS_ENABLED(CONFIG_MT76_LEDS)) {
+		dev->mt76.led_cdev.brightness_set = mt7915_led_set_brightness;
+		dev->mt76.led_cdev.blink_set = mt7915_led_set_blink;
+	}
+
 	ret = mt76_register_device(&dev->mt76, true, mt76_rates,
 				   ARRAY_SIZE(mt76_rates));
 	if (ret)

drivers/net/wireless/mediatek/mt76/mt7915/mmio.c

@@ -92,8 +92,7 @@ static u32 __mt7915_reg_addr(struct mt7915_dev *dev, u32 addr)
 	}
 
 	if ((addr >= 0x18000000 && addr < 0x18c00000) ||
-	    (addr >= 0x70000000 && addr < 0x78000000) ||
-	    (addr >= 0x7c000000 && addr < 0x7c400000))
+	    (addr >= 0x70000000 && addr < 0x78000000))
 		return mt7915_reg_map_l1(dev, addr);
 
 	return mt7915_reg_map_l2(dev, addr);

drivers/net/wireless/mediatek/mt76/mt7915/regs.h

@@ -57,6 +57,7 @@
 #define MT_WF_TMAC(_band, ofs)		(MT_WF_TMAC_BASE(_band) + (ofs))
 
 #define MT_TMAC_TCR0(_band)		MT_WF_TMAC(_band, 0)
+#define MT_TMAC_TCR0_TX_BLINK		GENMASK(7, 6)
 #define MT_TMAC_TCR0_TBTT_STOP_CTRL	BIT(25)
 
 #define MT_TMAC_CDTR(_band)		MT_WF_TMAC(_band, 0x090)
@@ -423,6 +424,20 @@
 #define MT_SWDEF_ICAP_MODE		1
 #define MT_SWDEF_SPECTRUM_MODE		2
 
+#define MT_LED_TOP_BASE			0x18013000
+#define MT_LED_PHYS(_n)			(MT_LED_TOP_BASE + (_n))
+
+#define MT_LED_CTRL(_n)			MT_LED_PHYS(0x00 + ((_n) * 4))
+#define MT_LED_CTRL_KICK		BIT(7)
+#define MT_LED_CTRL_BLINK_MODE		BIT(2)
+#define MT_LED_CTRL_POLARITY		BIT(1)
+
+#define MT_LED_TX_BLINK(_n)		MT_LED_PHYS(0x10 + ((_n) * 4))
+#define MT_LED_TX_BLINK_ON_MASK		GENMASK(7, 0)
+#define MT_LED_TX_BLINK_OFF_MASK        GENMASK(15, 8)
+
+#define MT_LED_EN(_n)			MT_LED_PHYS(0x40 + ((_n) * 4))
+
 #define MT_TOP_BASE			0x18060000
 #define MT_TOP(ofs)			(MT_TOP_BASE + (ofs))
 
@@ -433,6 +448,10 @@
 #define MT_TOP_MISC			MT_TOP(0xf0)
 #define MT_TOP_MISC_FW_STATE		GENMASK(2, 0)
 
+#define MT_LED_GPIO_MUX2                0x70005058 /* GPIO 18 */
+#define MT_LED_GPIO_MUX3                0x7000505C /* GPIO 26 */
+#define MT_LED_GPIO_SEL_MASK            GENMASK(11, 8)
+
 #define MT_HW_BOUND			0x70010020
 #define MT_HW_CHIPID			0x70010200
 #define MT_HW_REV			0x70010204