led: led_cortina: Add CAxxx LED support

Add Cortina Access LED controller support for CAxxxx SOCs

Signed-off-by: Jway Lin <jway.lin@cortina-access.com>
Signed-off-by: Alex Nemirovsky <alex.nemirovsky@cortina-access.com>
CC: Simon Glass <sjg@chromium.org>

Add head file fixed link error and remove unused flashing function
Reviewed-by: Simon Glass <sjg@chromium.org>

MAINTAINERS

@@ -181,6 +181,7 @@ F:	board/cortina/common/
 F:	drivers/gpio/cortina_gpio.c
 F:	drivers/watchdog/cortina_wdt.c
 F:	drivers/serial/serial_cortina.c
+F:	drivers/led/led_cortina.c
 F:	drivers/mmc/ca_dw_mmc.c
 F:	drivers/i2c/i2c-cortina.c
 F:	drivers/i2c/i2c-cortina.h
@@ -766,6 +767,7 @@ F:	board/cortina/common/
 F:	drivers/gpio/cortina_gpio.c
 F:	drivers/watchdog/cortina_wdt.c
 F:	drivers/serial/serial_cortina.c
+F:	drivers/led/led_cortina.c
 F:	drivers/mmc/ca_dw_mmc.c
 F:	drivers/i2c/i2c-cortina.c
 F:	drivers/i2c/i2c-cortina.h
@@ -868,7 +870,7 @@ S:	Maintained
 F:	arch/powerpc/
 
 POWERPC MPC8XX
-M:	Christophe Leroy <christophe.leroy@csgroup.eu>
+M:	Christophe Leroy <christophe.leroy@c-s.fr>
 S:	Maintained
 T:	git https://gitlab.denx.de/u-boot/custodians/u-boot-mpc8xx.git
 F:	arch/powerpc/cpu/mpc8xx/

drivers/led/Kconfig

@@ -35,6 +35,14 @@ config LED_BCM6858
 	  This option enables support for LEDs connected to the BCM6858
 	  HW has blinking capabilities and up to 32 LEDs can be controlled.
 
+config LED_CORTINA
+	bool "LED Support for Cortina Access CAxxxx SoCs"
+	depends on LED && (CORTINA_PLATFORM)
+	help
+	  This option enables support for LEDs connected to the Cortina
+	  Access CAxxxx SOCs.
+
+
 config LED_BLINK
 	bool "Support LED blinking"
 	depends on LED

drivers/led/Makefile

@@ -8,3 +8,4 @@ obj-$(CONFIG_LED_BCM6328) += led_bcm6328.o
 obj-$(CONFIG_LED_BCM6358) += led_bcm6358.o
 obj-$(CONFIG_LED_BCM6858) += led_bcm6858.o
 obj-$(CONFIG_$(SPL_)LED_GPIO) += led_gpio.o
+obj-$(CONFIG_LED_CORTINA) += led_cortina.o

drivers/led/led_cortina.c

@@ -0,0 +1,298 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Copyright (C) 2020 Cortina-Access
+ * Author: Jway Lin <jway.lin@cortina-access.com>
+ *
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <led.h>
+#include <log.h>
+#include <asm/io.h>
+#include <dm/lists.h>
+#include <linux/bitops.h>
+
+#define LED_MAX_HW_BLINK		127
+#define LED_MAX_COUNT			16
+
+/* LED_CONTROL fields */
+#define LED_BLINK_RATE1_SHIFT	0
+#define LED_BLINK_RATE1_MASK	0xff
+#define LED_BLINK_RATE2_SHIFT	8
+#define LED_BLINK_RATE2_MASK	0xff
+#define LED_CLK_TEST			BIT(16)
+#define LED_CLK_POLARITY		BIT(17)
+#define LED_CLK_TEST_MODE		BIT(16)
+#define LED_CLK_TEST_RX_TEST	BIT(30)
+#define LED_CLK_TEST_TX_TEST	BIT(31)
+
+/* LED_CONFIG fields */
+#define LED_EVENT_ON_SHIFT		0
+#define LED_EVENT_ON_MASK		0x7
+#define LED_EVENT_BLINK_SHIFT	3
+#define LED_EVENT_BLINK_MASK	0x7
+#define LED_EVENT_OFF_SHIFT	6
+#define LED_EVENT_OFF_MASK		0x7
+#define LED_OFF_ON_SHIFT		9
+#define LED_OFF_ON_MASK			0x3
+#define LED_PORT_SHIFT			11
+#define LED_PORT_MASK			0x7
+#define LED_OFF_VAL				BIT(14)
+#define LED_SW_EVENT			BIT(15)
+#define LED_BLINK_SEL			BIT(16)
+
+/* LED_CONFIG structures */
+struct cortina_led_cfg {
+	void __iomem *regs;
+	u32 pin;			/* LED pin nubmer */
+	bool active_low;	/*Active-High or Active-Low*/
+	u32 off_event;		/* set led off event (RX,TX,SW)*/
+	u32 blink_event;	/* set led blink event (RX,TX,SW)*/
+	u32 on_event;	/* set led on event (RX,TX,SW)*/
+	u32 port;		/* corresponding ethernet port */
+	int blink_sel;		/* select blink-rate1 or blink-rate2  */
+};
+
+/* LED_control structures */
+struct cortina_led_platdata {
+	void __iomem *ctrl_regs;
+	u16 rate1;	/* blink rate setting 0 */
+	u16 rate2;	/* blink rate setting 1 */
+};
+
+enum ca_led_state_t {
+	CA_EVENT_MODE = 0,
+	CA_LED_ON = 1,
+	CA_LED_OFF,
+};
+
+static void cortina_led_write(void __iomem *reg, unsigned long data)
+{
+	writel(data, reg);
+}
+
+static unsigned long cortina_led_read(void __iomem *reg)
+{
+	return readl(reg);
+}
+
+static enum led_state_t cortina_led_get_state(struct udevice *dev)
+{
+	struct cortina_led_cfg *priv = dev_get_priv(dev);
+	enum led_state_t state = LEDST_OFF;
+	u32 val;
+
+	val = readl(priv->regs);
+
+	if (val & LED_SW_EVENT)
+		state = LEDST_ON;
+
+	return state;
+}
+
+static int cortina_led_set_state(struct udevice *dev, enum led_state_t state)
+{
+	u32 val;
+	struct cortina_led_cfg *priv = dev_get_priv(dev);
+
+	val = readl(priv->regs);
+	val &= ~(LED_OFF_ON_MASK << LED_OFF_ON_SHIFT);
+
+	switch (state) {
+	case LEDST_OFF:
+		val &= ~LED_SW_EVENT;
+		val |= CA_LED_OFF << LED_OFF_ON_SHIFT;
+		cortina_led_write(priv->regs, val);
+		break;
+	case LEDST_ON:
+		val |= LED_SW_EVENT;
+		val |= CA_LED_ON << LED_OFF_ON_SHIFT;
+		cortina_led_write(priv->regs, val);
+		break;
+	case LEDST_TOGGLE:
+		if (cortina_led_get_state(dev) == LEDST_OFF)
+			return cortina_led_set_state(dev, LEDST_ON);
+		else
+			return cortina_led_set_state(dev, LEDST_OFF);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct led_ops cortina_led_ops = {
+	.get_state = cortina_led_get_state,
+	.set_state = cortina_led_set_state,
+};
+
+static int ca_led_ofdata_to_platdata(struct udevice *dev)
+{
+	struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
+
+	/* Top-level LED node */
+	if (!uc_plat->label) {
+		struct cortina_led_platdata *plt = dev_get_platdata(dev);
+
+		plt->rate1 =
+			dev_read_u32_default(dev, "Cortina,blink-rate1", 256);
+		plt->rate2 =
+			dev_read_u32_default(dev, "Cortina,blink-rate2", 512);
+		plt->ctrl_regs = dev_remap_addr(dev);
+	} else {
+		struct cortina_led_cfg *priv = dev_get_priv(dev);
+
+		priv->regs = dev_remap_addr(dev_get_parent(dev));
+		priv->pin = dev_read_u32_default(dev, "pin", LED_MAX_COUNT);
+		priv->blink_sel = dev_read_u32_default(dev, "blink-sel", 0);
+		priv->off_event = dev_read_u32_default(dev, "off-event", 0);
+		priv->blink_event = dev_read_u32_default(dev, "blink-event", 0);
+		priv->on_event = dev_read_u32_default(dev, "on-event", 0);
+		priv->port = dev_read_u32_default(dev, "port", 0);
+
+		if (dev_read_bool(dev, "active-low"))
+			priv->active_low = true;
+		else
+			priv->active_low = false;
+	}
+
+	return 0;
+}
+
+static int cortina_led_probe(struct udevice *dev)
+{
+	struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
+
+	/* Top-level LED node */
+	if (!uc_plat->label) {
+		struct cortina_led_platdata *platdata = dev_get_platdata(dev);
+		u32 reg_value, val;
+		u16 rate1, rate2;
+
+		if (!platdata->ctrl_regs)
+			return -EINVAL;
+
+		reg_value = 0;
+		reg_value |= LED_CLK_POLARITY;
+
+		rate1 = platdata->rate1;
+		rate2 = platdata->rate2;
+
+		val = rate1 / 16 - 1;
+		rate1 = val > LED_MAX_HW_BLINK ?
+					LED_MAX_HW_BLINK : val;
+		reg_value |= (rate1 & LED_BLINK_RATE1_MASK) <<
+					LED_BLINK_RATE1_SHIFT;
+
+		val = rate2 / 16 - 1;
+		rate2 = val > LED_MAX_HW_BLINK ?
+					LED_MAX_HW_BLINK : val;
+		reg_value |= (rate2 & LED_BLINK_RATE2_MASK) <<
+					LED_BLINK_RATE2_SHIFT;
+
+		cortina_led_write(platdata->ctrl_regs, reg_value);
+
+	} else {
+		struct cortina_led_cfg *priv = dev_get_priv(dev);
+		void __iomem *regs;
+		u32 val, port, off_event, blink_event, on_event;
+
+		regs = priv->regs;
+		if (!regs)
+			return -EINVAL;
+
+		if (priv->pin >= LED_MAX_COUNT)
+			return -EINVAL;
+
+		priv->regs = regs + 4 + priv->pin * 4;
+
+		val = cortina_led_read(priv->regs);
+
+		if (priv->active_low)
+			val |= LED_OFF_VAL;
+		else
+			val &= ~LED_OFF_VAL;
+
+		if (priv->blink_sel == 0)
+			val &= ~LED_BLINK_SEL;
+		else if (priv->blink_sel == 1)
+			val |= LED_BLINK_SEL;
+
+		off_event = priv->off_event;
+		val &= ~(LED_EVENT_OFF_MASK << LED_EVENT_OFF_SHIFT);
+		if (off_event != 0)
+			val |= BIT(off_event) << LED_EVENT_OFF_SHIFT;
+
+		blink_event =  priv->blink_event;
+		val &= ~(LED_EVENT_BLINK_MASK << LED_EVENT_BLINK_SHIFT);
+		if (blink_event != 0)
+			val |= BIT(blink_event) << LED_EVENT_BLINK_SHIFT;
+
+		on_event = priv->on_event;
+		val &= ~(LED_EVENT_ON_MASK << LED_EVENT_ON_SHIFT);
+		if (on_event != 0)
+			val |= BIT(on_event) << LED_EVENT_ON_SHIFT;
+
+		port = priv->port;
+		val &= ~(LED_PORT_MASK << LED_PORT_SHIFT);
+		val |= port << LED_PORT_SHIFT;
+
+		/* force off */
+		val &= ~(LED_OFF_ON_MASK << LED_OFF_ON_SHIFT);
+		val |= CA_LED_OFF << LED_OFF_ON_SHIFT;
+
+		cortina_led_write(priv->regs, val);
+	}
+
+	return 0;
+}
+
+static int cortina_led_bind(struct udevice *parent)
+{
+	ofnode node;
+
+	dev_for_each_subnode(node, parent) {
+		struct led_uc_plat *uc_plat;
+		struct udevice *dev;
+		const char *label;
+		int ret;
+
+		label = ofnode_read_string(node, "label");
+		if (!label) {
+			debug("%s: node %s has no label\n", __func__,
+			      ofnode_get_name(node));
+			return -EINVAL;
+		}
+
+		ret = device_bind_driver_to_node(parent, "ca-leds",
+						 ofnode_get_name(node),
+						 node, &dev);
+		if (ret)
+			return ret;
+		uc_plat = dev_get_uclass_platdata(dev);
+		uc_plat->label = label;
+	}
+
+	return 0;
+}
+
+static const struct udevice_id ca_led_ids[] = {
+	{ .compatible = "cortina,ca-leds" },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(cortina_led) = {
+	.name = "ca-leds",
+	.id = UCLASS_LED,
+	.of_match = ca_led_ids,
+	.ofdata_to_platdata = ca_led_ofdata_to_platdata,
+	.bind = cortina_led_bind,
+	.probe = cortina_led_probe,
+	.platdata_auto_alloc_size = sizeof(struct cortina_led_platdata),
+	.priv_auto_alloc_size = sizeof(struct cortina_led_cfg),
+	.ops = &cortina_led_ops,
+};