[PATCH v6 5/8] led: led_cortina: Add CAxxx LED support

Alex Nemirovsky
2020-04-21T05:29:32Z

From: Jway Lin <jway.lin@cortina-access.com>

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>

---

Changes in v6: None
Changes in v5: None
Changes in v4:
- remove unused macros
- remove cortina prefix from macros
- remove use BSS variable
- further cleanup to meet code style guidelines
- add additinal struct comments
- rename DT blink rate symbol

Changes in v3: None
Changes in v2: None

MAINTAINERS | 2 +
drivers/led/Kconfig | 8 ++
drivers/led/Makefile | 1 +
drivers/led/led_cortina.c | 268 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 279 insertions(+)
create mode 100644 drivers/led/led_cortina.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 307e620..e9b6bfa 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -183,6 +183,7 @@ F: drivers/serial/serial_cortina.c
F: drivers/mmc/ca_dw_mmc.c
F: drivers/i2c/i2c-cortina.c
F: drivers/i2c/i2c-cortina.h
+F: drivers/led/led_cortina.c

ARM/CZ.NIC TURRIS MOX SUPPORT
M: Marek Behun <marek.behun@nic.cz>
@@ -724,6 +725,7 @@ F: drivers/serial/serial_cortina.c
F: drivers/mmc/ca_dw_mmc.c
F: drivers/i2c/i2c-cortina.c
F: drivers/i2c/i2c-cortina.h
+F: drivers/led/led_cortina.c

MIPS MSCC
M: Gregory CLEMENT <gregory.clement@bootlin.com>
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
index 6675934..cc87fbf 100644
--- a/drivers/led/Kconfig
+++ b/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
diff --git a/drivers/led/Makefile b/drivers/led/Makefile
index 3654dd3..8e3ae7f 100644
--- a/drivers/led/Makefile
+++ b/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
diff --git a/drivers/led/led_cortina.c b/drivers/led/led_cortina.c
new file mode 100644
index 0000000..f873d30
--- /dev/null
+++ b/drivers/led/led_cortina.c
@@ -0,0 +1,268 @@
+// 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 <asm/io.h>
+#include <dm/lists.h>
+
+#define LED_MAX_HW_BLINK 127
+#define LED_MAX_COUNT 16
+
+/* LED_CONTROL fields */
+#define LED_BLINK_RATE1_OFFSET 0
+#define LED_BLINK_RATE1_MASK 0xff
+#define LED_BLINK_RATE2_OFFSET 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_OFFSET 0
+#define LED_EVENT_ON_MASK 0x7
+#define LED_EVENT_BLINK_OFFSET 3
+#define LED_EVENT_BLINK_MASK 0x7
+#define LED_EVENT_OFF_OFFSET 6
+#define LED_EVENT_OFF_MASK 0x7
+#define LED_OFF_ON_OFFSET 9
+#define LED_OFF_ON_MASK 0x3
+#define LED_PORT_OFFSET 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;
+ int idx;
+ bool active_low;
+ int off_event; /* set led off event */
+ int blink_event; /* set led blink event */
+ int on_event; /* set led on event */
+ int port; /* corresponding ethernet port */
+ int blink; /* blink rate sel */
+};
+
+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);
+
+ switch (state) {
+ case LEDST_OFF:
+ val &= ~LED_SW_EVENT;
+ val &= ~(LED_OFF_ON_MASK << LED_OFF_ON_OFFSET);
+ val |= 0x3 << LED_OFF_ON_OFFSET;
+ cortina_led_write(priv->regs, val);
+ break;
+ case LEDST_ON:
+ val |= LED_SW_EVENT;
+ val &= ~(LED_OFF_ON_MASK << LED_OFF_ON_OFFSET);
+ val |= 0x1 << LED_OFF_ON_OFFSET;
+ 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 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) {
+ void __iomem *regs;
+ u32 reg_value, val;
+ u16 rate1, rate2;
+
+ regs = dev_remap_addr(dev);
+ if (!regs)
+ return -EINVAL;
+
+ reg_value = 0;
+ reg_value |= LED_CLK_POLARITY;
+
+ rate1 = dev_read_u32_default(dev, "cortina,blink-rate1", 256);
+ rate2 = dev_read_u32_default(dev, "cortina,blink-rate2", 512);
+
+ 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_OFFSET;
+
+ 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_OFFSET;
+
+ cortina_led_write(regs, reg_value);
+
+ } else {
+ struct cortina_led_cfg *priv = dev_get_priv(dev);
+ void __iomem *regs;
+ u32 pin, val, blink, port, off_event, blink_event, on_event;
+
+ regs = dev_remap_addr(dev_get_parent(dev));
+ if (!regs)
+ return -EINVAL;
+
+ pin = dev_read_u32_default(dev, "pin", LED_MAX_COUNT);
+
+ if (pin >= LED_MAX_COUNT)
+ return -EINVAL;
+
+ priv->regs = regs + 4 + pin * 4;
+
+ val = cortina_led_read(priv->regs);
+
+ if (dev_read_bool(dev, "active-low")) {
+ priv->active_low = true;
+ val |= LED_OFF_VAL;
+ } else {
+ priv->active_low = false;
+ val &= ~LED_OFF_VAL;
+ }
+
+ blink = dev_read_u32_default(dev, "blink-sel", 0);
+
+ if (blink == 0) {
+ priv->blink = 0;
+ val &= ~LED_BLINK_SEL;
+ } else if (blink == 1) {
+ priv->blink = 1;
+ val |= LED_BLINK_SEL;
+ }
+
+ off_event = dev_read_u32_default(dev, "off-event", 3);
+ val &= ~(LED_EVENT_OFF_MASK << LED_EVENT_OFF_OFFSET);
+ if (off_event != 3) {
+ priv->off_event = off_event;
+ val |= BIT(off_event) << LED_EVENT_OFF_OFFSET;
+ }
+
+ blink_event = dev_read_u32_default(dev, "blink-event", 3);
+ val &= ~(LED_EVENT_BLINK_MASK << LED_EVENT_BLINK_OFFSET);
+ if (blink_event != 3) {
+ priv->blink_event = blink_event;
+ val |= BIT(blink_event) << LED_EVENT_BLINK_OFFSET;
+ }
+
+ on_event = dev_read_u32_default(dev, "on-event", 3);
+ val &= ~(LED_EVENT_ON_MASK << LED_EVENT_ON_OFFSET);
+ if (on_event != 3) {
+ priv->on_event = on_event;
+ val |= BIT(on_event) << LED_EVENT_ON_OFFSET;
+ }
+
+ port = dev_read_u32_default(dev, "port", 0);
+ priv->port = port;
+ val &= ~(LED_PORT_MASK << LED_PORT_OFFSET);
+ val |= port << LED_PORT_OFFSET;
+
+ /* force off */
+ val &= ~(LED_OFF_ON_MASK << LED_OFF_ON_OFFSET);
+ val |= 0x3 << LED_OFF_ON_OFFSET;
+
+ 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,
+ .bind = cortina_led_bind,
+ .probe = cortina_led_probe,
+ .priv_auto_alloc_size = sizeof(struct cortina_led_cfg),
+ .ops = &cortina_led_ops,
+};
--
2.7.4