[ARM] 4303/3: base kernel support for TI DaVinci

Add base kernel support for the TI DaVinci platform.

This patch only includes interrupts, timers, CPU identification,
serial support and basic power and sleep controller init.  More
drivers to come.

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 96 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/serial.c b/arch/arm/mach-davinci/serial.c
new file mode 100644
index 00000000000..8368c93c788
--- /dev/null
+++ b/arch/arm/mach-davinci/serial.c
@@ -0,0 +1,96 @@
+/*
+ * TI DaVinci serial driver
+ *
+ * Copyright (C) 2006 Texas Instruments.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/serial_8250.h>
+#include <linux/serial_reg.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/hardware.h>
+#include <asm/arch/serial.h>
+#include <asm/arch/irqs.h>
+
+#define UART_DAVINCI_PWREMU 0x0c
+
+static inline unsigned int davinci_serial_in(struct plat_serial8250_port *up,
+					  int offset)
+{
+	offset <<= up->regshift;
+	return (unsigned int)__raw_readb(up->membase + offset);
+}
+
+static inline void davinci_serial_outp(struct plat_serial8250_port *p,
+				       int offset, int value)
+{
+	offset <<= p->regshift;
+	__raw_writeb(value, p->membase + offset);
+}
+
+static struct plat_serial8250_port serial_platform_data[] = {
+	{
+		.membase	= (char *)IO_ADDRESS(DAVINCI_UART0_BASE),
+		.mapbase	= (unsigned long)DAVINCI_UART0_BASE,
+		.irq		= IRQ_UARTINT0,
+		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
+		.iotype		= UPIO_MEM,
+		.regshift	= 2,
+		.uartclk	= 27000000,
+	},
+	{
+		.flags		= 0
+	},
+};
+
+static struct platform_device serial_device = {
+	.name			= "serial8250",
+	.id			= PLAT8250_DEV_PLATFORM,
+	.dev			= {
+		.platform_data	= serial_platform_data,
+	},
+};
+
+static void __init davinci_serial_reset(struct plat_serial8250_port *p)
+{
+	/* reset both transmitter and receiver: bits 14,13 = UTRST, URRST */
+	unsigned int pwremu = 0;
+
+	davinci_serial_outp(p, UART_IER, 0);  /* disable all interrupts */
+
+	davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu);
+	mdelay(10);
+
+	pwremu |= (0x3 << 13);
+	pwremu |= 0x1;
+	davinci_serial_outp(p, UART_DAVINCI_PWREMU, pwremu);
+}
+
+static int __init davinci_init(void)
+{
+	davinci_serial_reset(&serial_platform_data[0]);
+	return platform_device_register(&serial_device);
+}
+
+arch_initcall(davinci_init);