xtensa: platform: s6105

Support for the S6105 IP Camera Reference Design Kit.
Signed-off-by: Johannes Weiner <jw@emlix.com>
Signed-off-by: Oskar Schirmer <os@emlix.com>
Signed-off-by: Chris Zankel <chris@zankel.net>

arch/xtensa/Kconfig

@@ -156,6 +156,10 @@ config XTENSA_PLATFORM_XT2000
 	  XT2000 is the name of Tensilica's feature-rich emulation platform.
 	  This hardware is capable of running a full Linux distribution.
 
+config XTENSA_PLATFORM_S6105
+	bool "S6105"
+	select SERIAL_CONSOLE
+
 endchoice
 
 

arch/xtensa/Makefile

@@ -25,6 +25,7 @@ export VARIANT
 
 platform-$(CONFIG_XTENSA_PLATFORM_XT2000)	:= xt2000
 platform-$(CONFIG_XTENSA_PLATFORM_ISS)		:= iss
+platform-$(CONFIG_XTENSA_PLATFORM_S6105)	:= s6105
 
 PLATFORM = $(platform-y)
 export PLATFORM

arch/xtensa/platforms/s6105/Makefile

+# Makefile for the Stretch S6105 eval board
+
+obj-y		:= setup.o device.o

arch/xtensa/platforms/s6105/device.c

+/*
+ * s6105 platform devices
+ *
+ * Copyright (c) 2009 emlix GmbH
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/serial.h>
+#include <linux/serial_8250.h>
+
+#include <variant/hardware.h>
+
+#define UART_INTNUM		4
+
+static const signed char uart_irq_mappings[] = {
+	S6_INTC_UART(0),
+	S6_INTC_UART(1),
+	-1,
+};
+
+const signed char *platform_irq_mappings[NR_IRQS] = {
+	[UART_INTNUM] = uart_irq_mappings,
+};
+
+static struct plat_serial8250_port serial_platform_data[] = {
+	{
+		.membase = (void *)S6_REG_UART + 0x0000,
+		.mapbase = S6_REG_UART + 0x0000,
+		.irq = UART_INTNUM,
+		.uartclk = S6_SCLK,
+		.regshift = 2,
+		.iotype = SERIAL_IO_MEM,
+		.flags = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST,
+	},
+	{
+		.membase = (void *)S6_REG_UART + 0x1000,
+		.mapbase = S6_REG_UART + 0x1000,
+		.irq = UART_INTNUM,
+		.uartclk = S6_SCLK,
+		.regshift = 2,
+		.iotype = SERIAL_IO_MEM,
+		.flags = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST,
+	},
+	{ },
+};
+
+static struct platform_device platform_devices[] = {
+	{
+		.name = "serial8250",
+		.id = PLAT8250_DEV_PLATFORM,
+		.dev = {
+			.platform_data = serial_platform_data,
+		},
+	},
+};
+
+static int __init device_init(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(platform_devices); i++)
+		platform_device_register(&platform_devices[i]);
+	return 0;
+}
+arch_initcall_sync(device_init);

arch/xtensa/platforms/s6105/include/platform/gpio.h

+#ifndef __ASM_XTENSA_S6105_GPIO_H
+#define __ASM_XTENSA_S6105_GPIO_H
+
+#define GPIO_BP_TEMP_ALARM	0
+#define GPIO_PB_RESET_IN	1
+#define GPIO_EXP_IRQ		2
+#define GPIO_TRIGGER_IRQ	3
+#define GPIO_RTC_IRQ		4
+#define GPIO_PHY_IRQ		5
+#define GPIO_IMAGER_RESET	6
+#define GPIO_SD_IRQ		7
+#define GPIO_MINI_BOOT_INH	8
+#define GPIO_BOARD_RESET	9
+#define GPIO_EXP_PRESENT	10
+#define GPIO_LED1_NGREEN	12
+#define GPIO_LED1_RED		13
+#define GPIO_LED0_NGREEN	14
+#define GPIO_LED0_NRED		15
+#define GPIO_SPI_CS0		16
+#define GPIO_SPI_CS1		17
+#define GPIO_SPI_CS3		19
+#define GPIO_SPI_CS4		20
+#define GPIO_SD_WP		21
+#define GPIO_BP_RESET		22
+#define GPIO_ALARM_OUT		23
+
+#endif /* __ASM_XTENSA_S6105_GPIO_H */

arch/xtensa/platforms/s6105/include/platform/hardware.h

+#ifndef __XTENSA_S6105_HARDWARE_H
+#define __XTENSA_S6105_HARDWARE_H
+
+#define PLATFORM_DEFAULT_MEM_START	0x40000000
+#define PLATFORM_DEFAULT_MEM_SIZE	0x08000000
+
+#define MAX_DMA_ADDRESS			0
+
+#define KERNELOFFSET			(PLATFORM_DEFAULT_MEM_START + 0x1000)
+
+#endif /* __XTENSA_S6105_HARDWARE_H */

arch/xtensa/platforms/s6105/include/platform/serial.h

+#ifndef __ASM_XTENSA_S6105_SERIAL_H
+#define __ASM_XTENSA_S6105_SERIAL_H
+
+#include <variant/hardware.h>
+
+#define BASE_BAUD (S6_SCLK / 16)
+
+#endif /* __ASM_XTENSA_S6105_SERIAL_H */

arch/xtensa/platforms/s6105/setup.c

+/*
+ * s6105 control routines
+ *
+ * Copyright (c) 2009 emlix GmbH
+ */
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <asm/bootparam.h>
+
+#include <variant/hardware.h>
+#include <platform/gpio.h>
+
+void platform_halt(void)
+{
+	local_irq_disable();
+	while (1)
+		;
+}
+
+void platform_power_off(void)
+{
+	platform_halt();
+}
+
+void platform_restart(void)
+{
+	platform_halt();
+}
+
+void __init platform_setup(char **cmdline)
+{
+	unsigned long reg;
+
+	reg = readl(S6_REG_GREG1 + S6_GREG1_CLKGATE);
+	reg &= ~(1 << S6_GREG1_BLOCK_SB);
+	writel(reg, S6_REG_GREG1 + S6_GREG1_CLKGATE);
+
+	reg = readl(S6_REG_GREG1 + S6_GREG1_BLOCKENA);
+	reg |= 1 << S6_GREG1_BLOCK_SB;
+	writel(reg, S6_REG_GREG1 + S6_GREG1_BLOCKENA);
+
+	printk(KERN_NOTICE "S6105 on Stretch S6000 - "
+		"Copyright (C) 2009 emlix GmbH <info@emlix.com>\n");
+}
+
+void __init platform_init(bp_tag_t *first)
+{
+	gpio_request(GPIO_LED1_NGREEN, "led1_green");
+	gpio_request(GPIO_LED1_RED, "led1_red");
+	gpio_direction_output(GPIO_LED1_NGREEN, 1);
+}
+
+void platform_heartbeat(void)
+{
+	static unsigned int c;
+
+	if (!(++c & 0x4F))
+		gpio_direction_output(GPIO_LED1_RED, !(c & 0x10));
+}