Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 246 insertions, 0 deletions

diff --git a/arch/arm/mach-omap1/serial.c b/arch/arm/mach-omap1/serial.c
new file mode 100644
index 0000000000..ffa4a9bece
--- /dev/null
+++ b/arch/arm/mach-omap1/serial.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/arch/arm/mach-omap1/serial.c
+ *
+ * OMAP1 serial support.
+ */
+#include <linux/gpio/machine.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/delay.h>
+#include <linux/serial.h>
+#include <linux/tty.h>
+#include <linux/serial_8250.h>
+#include <linux/serial_reg.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <asm/mach-types.h>
+
+#include "common.h"
+#include "serial.h"
+#include "mux.h"
+#include "pm.h"
+#include "soc.h"
+
+static struct clk * uart1_ck;
+static struct clk * uart2_ck;
+static struct clk * uart3_ck;
+
+static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
+					  int offset)
+{
+	offset <<= up->regshift;
+	return (unsigned int)__raw_readb(up->membase + offset);
+}
+
+static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
+				    int value)
+{
+	offset <<= p->regshift;
+	__raw_writeb(value, p->membase + offset);
+}
+
+/*
+ * Internal UARTs need to be initialized for the 8250 autoconfig to work
+ * properly. Note that the TX watermark initialization may not be needed
+ * once the 8250.c watermark handling code is merged.
+ */
+static void __init omap_serial_reset(struct plat_serial8250_port *p)
+{
+	omap_serial_outp(p, UART_OMAP_MDR1,
+			UART_OMAP_MDR1_DISABLE);	/* disable UART */
+	omap_serial_outp(p, UART_OMAP_SCR, 0x08);	/* TX watermark */
+	omap_serial_outp(p, UART_OMAP_MDR1,
+			UART_OMAP_MDR1_16X_MODE);	/* enable UART */
+
+	if (!cpu_is_omap15xx()) {
+		omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
+		while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
+	}
+}
+
+static struct plat_serial8250_port serial_platform_data[] = {
+	{
+		.mapbase	= OMAP1_UART1_BASE,
+		.irq		= INT_UART1,
+		.flags		= UPF_BOOT_AUTOCONF,
+		.iotype		= UPIO_MEM,
+		.regshift	= 2,
+		.uartclk	= OMAP16XX_BASE_BAUD * 16,
+	},
+	{
+		.mapbase	= OMAP1_UART2_BASE,
+		.irq		= INT_UART2,
+		.flags		= UPF_BOOT_AUTOCONF,
+		.iotype		= UPIO_MEM,
+		.regshift	= 2,
+		.uartclk	= OMAP16XX_BASE_BAUD * 16,
+	},
+	{
+		.mapbase	= OMAP1_UART3_BASE,
+		.irq		= INT_UART3,
+		.flags		= UPF_BOOT_AUTOCONF,
+		.iotype		= UPIO_MEM,
+		.regshift	= 2,
+		.uartclk	= OMAP16XX_BASE_BAUD * 16,
+	},
+	{ },
+};
+
+static struct platform_device serial_device = {
+	.name			= "serial8250",
+	.id			= PLAT8250_DEV_PLATFORM,
+	.dev			= {
+		.platform_data	= serial_platform_data,
+	},
+};
+
+/*
+ * Note that on Innovator-1510 UART2 pins conflict with USB2.
+ * By default UART2 does not work on Innovator-1510 if you have
+ * USB OHCI enabled. To use UART2, you must disable USB2 first.
+ */
+void __init omap_serial_init(void)
+{
+	int i;
+
+	if (cpu_is_omap15xx()) {
+		serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
+		serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
+		serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) {
+		/* Static mapping, never released */
+		serial_platform_data[i].membase =
+			ioremap(serial_platform_data[i].mapbase, SZ_2K);
+		if (!serial_platform_data[i].membase) {
+			printk(KERN_ERR "Could not ioremap uart%i\n", i);
+			continue;
+		}
+		switch (i) {
+		case 0:
+			uart1_ck = clk_get(NULL, "uart1_ck");
+			if (IS_ERR(uart1_ck))
+				printk("Could not get uart1_ck\n");
+			else {
+				clk_prepare_enable(uart1_ck);
+				if (cpu_is_omap15xx())
+					clk_set_rate(uart1_ck, 12000000);
+			}
+			break;
+		case 1:
+			uart2_ck = clk_get(NULL, "uart2_ck");
+			if (IS_ERR(uart2_ck))
+				printk("Could not get uart2_ck\n");
+			else {
+				clk_prepare_enable(uart2_ck);
+				if (cpu_is_omap15xx())
+					clk_set_rate(uart2_ck, 12000000);
+				else
+					clk_set_rate(uart2_ck, 48000000);
+			}
+			break;
+		case 2:
+			uart3_ck = clk_get(NULL, "uart3_ck");
+			if (IS_ERR(uart3_ck))
+				printk("Could not get uart3_ck\n");
+			else {
+				clk_prepare_enable(uart3_ck);
+				if (cpu_is_omap15xx())
+					clk_set_rate(uart3_ck, 12000000);
+			}
+			break;
+		}
+		omap_serial_reset(&serial_platform_data[i]);
+	}
+}
+
+#ifdef CONFIG_OMAP_SERIAL_WAKE
+
+static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
+{
+	/* Need to do something with serial port right after wake-up? */
+	return IRQ_HANDLED;
+}
+
+/*
+ * Reroutes serial RX lines to GPIO lines for the duration of
+ * sleep to allow waking up the device from serial port even
+ * in deep sleep.
+ */
+void omap_serial_wake_trigger(int enable)
+{
+	if (!cpu_is_omap16xx())
+		return;
+
+	if (uart1_ck != NULL) {
+		if (enable)
+			omap_cfg_reg(V14_16XX_GPIO37);
+		else
+			omap_cfg_reg(V14_16XX_UART1_RX);
+	}
+	if (uart2_ck != NULL) {
+		if (enable)
+			omap_cfg_reg(R9_16XX_GPIO18);
+		else
+			omap_cfg_reg(R9_16XX_UART2_RX);
+	}
+	if (uart3_ck != NULL) {
+		if (enable)
+			omap_cfg_reg(L14_16XX_GPIO49);
+		else
+			omap_cfg_reg(L14_16XX_UART3_RX);
+	}
+}
+
+static void __init omap_serial_set_port_wakeup(int idx)
+{
+	struct gpio_desc *d;
+	int ret;
+
+	d = gpiod_get_index(NULL, "wakeup", idx, GPIOD_IN);
+	if (IS_ERR(d)) {
+		pr_err("Unable to get UART wakeup GPIO descriptor\n");
+		return;
+	}
+	ret = request_irq(gpiod_to_irq(d), &omap_serial_wake_interrupt,
+			  IRQF_TRIGGER_RISING, "serial wakeup", NULL);
+	if (ret) {
+		gpiod_put(d);
+		pr_err("No interrupt for UART%d wake GPIO\n", idx + 1);
+		return;
+	}
+	enable_irq_wake(gpiod_to_irq(d));
+}
+
+
+int __init omap_serial_wakeup_init(void)
+{
+	if (!cpu_is_omap16xx())
+		return 0;
+
+	if (uart1_ck != NULL)
+		omap_serial_set_port_wakeup(0);
+	if (uart2_ck != NULL)
+		omap_serial_set_port_wakeup(1);
+	if (uart3_ck != NULL)
+		omap_serial_set_port_wakeup(2);
+
+	return 0;
+}
+
+#endif	/* CONFIG_OMAP_SERIAL_WAKE */
+
+static int __init omap_init(void)
+{
+	if (!cpu_class_is_omap1())
+		return -ENODEV;
+
+	return platform_device_register(&serial_device);
+}
+arch_initcall(omap_init);