[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, 226 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/irq.c b/arch/arm/mach-davinci/irq.c
new file mode 100644
index 00000000000..1333d84d2e4
--- /dev/null
+++ b/arch/arm/mach-davinci/irq.c
@@ -0,0 +1,226 @@
+/*
+ * Interrupt handler for DaVinci boards.
+ *
+ * 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/interrupt.h>
+#include <linux/irq.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/mach/irq.h>
+
+#define IRQ_BIT(irq)		((irq) & 0x1f)
+
+#define FIQ_REG0_OFFSET		0x0000
+#define FIQ_REG1_OFFSET		0x0004
+#define IRQ_REG0_OFFSET		0x0008
+#define IRQ_REG1_OFFSET		0x000C
+#define IRQ_ENT_REG0_OFFSET	0x0018
+#define IRQ_ENT_REG1_OFFSET	0x001C
+#define IRQ_INCTL_REG_OFFSET	0x0020
+#define IRQ_EABASE_REG_OFFSET	0x0024
+#define IRQ_INTPRI0_REG_OFFSET	0x0030
+#define IRQ_INTPRI7_REG_OFFSET	0x004C
+
+static inline unsigned int davinci_irq_readl(int offset)
+{
+	return davinci_readl(DAVINCI_ARM_INTC_BASE + offset);
+}
+
+static inline void davinci_irq_writel(unsigned long value, int offset)
+{
+	davinci_writel(value, DAVINCI_ARM_INTC_BASE + offset);
+}
+
+/* Disable interrupt */
+static void davinci_mask_irq(unsigned int irq)
+{
+	unsigned int mask;
+	u32 l;
+
+	mask = 1 << IRQ_BIT(irq);
+
+	if (irq > 31) {
+		l = davinci_irq_readl(IRQ_ENT_REG1_OFFSET);
+		l &= ~mask;
+		davinci_irq_writel(l, IRQ_ENT_REG1_OFFSET);
+	} else {
+		l = davinci_irq_readl(IRQ_ENT_REG0_OFFSET);
+		l &= ~mask;
+		davinci_irq_writel(l, IRQ_ENT_REG0_OFFSET);
+	}
+}
+
+/* Enable interrupt */
+static void davinci_unmask_irq(unsigned int irq)
+{
+	unsigned int mask;
+	u32 l;
+
+	mask = 1 << IRQ_BIT(irq);
+
+	if (irq > 31) {
+		l = davinci_irq_readl(IRQ_ENT_REG1_OFFSET);
+		l |= mask;
+		davinci_irq_writel(l, IRQ_ENT_REG1_OFFSET);
+	} else {
+		l = davinci_irq_readl(IRQ_ENT_REG0_OFFSET);
+		l |= mask;
+		davinci_irq_writel(l, IRQ_ENT_REG0_OFFSET);
+	}
+}
+
+/* EOI interrupt */
+static void davinci_ack_irq(unsigned int irq)
+{
+	unsigned int mask;
+
+	mask = 1 << IRQ_BIT(irq);
+
+	if (irq > 31)
+		davinci_irq_writel(mask, IRQ_REG1_OFFSET);
+	else
+		davinci_irq_writel(mask, IRQ_REG0_OFFSET);
+}
+
+static struct irq_chip davinci_irq_chip_0 = {
+	.name	= "AINTC",
+	.ack	= davinci_ack_irq,
+	.mask	= davinci_mask_irq,
+	.unmask = davinci_unmask_irq,
+};
+
+
+/* FIQ are pri 0-1; otherwise 2-7, with 7 lowest priority */
+static const u8 default_priorities[DAVINCI_N_AINTC_IRQ] __initdata = {
+	[IRQ_VDINT0]		= 2,
+	[IRQ_VDINT1]		= 6,
+	[IRQ_VDINT2]		= 6,
+	[IRQ_HISTINT]		= 6,
+	[IRQ_H3AINT]		= 6,
+	[IRQ_PRVUINT]		= 6,
+	[IRQ_RSZINT]		= 6,
+	[7]			= 7,
+	[IRQ_VENCINT]		= 6,
+	[IRQ_ASQINT]		= 6,
+	[IRQ_IMXINT]		= 6,
+	[IRQ_VLCDINT]		= 6,
+	[IRQ_USBINT]		= 4,
+	[IRQ_EMACINT]		= 4,
+	[14]			= 7,
+	[15]			= 7,
+	[IRQ_CCINT0]		= 5,	/* dma */
+	[IRQ_CCERRINT]		= 5,	/* dma */
+	[IRQ_TCERRINT0]		= 5,	/* dma */
+	[IRQ_TCERRINT]		= 5,	/* dma */
+	[IRQ_PSCIN]		= 7,
+	[21]			= 7,
+	[IRQ_IDE]		= 4,
+	[23]			= 7,
+	[IRQ_MBXINT]		= 7,
+	[IRQ_MBRINT]		= 7,
+	[IRQ_MMCINT]		= 7,
+	[IRQ_SDIOINT]		= 7,
+	[28]			= 7,
+	[IRQ_DDRINT]		= 7,
+	[IRQ_AEMIFINT]		= 7,
+	[IRQ_VLQINT]		= 4,
+	[IRQ_TINT0_TINT12]	= 2,	/* clockevent */
+	[IRQ_TINT0_TINT34]	= 2,	/* clocksource */
+	[IRQ_TINT1_TINT12]	= 7,	/* DSP timer */
+	[IRQ_TINT1_TINT34]	= 7,	/* system tick */
+	[IRQ_PWMINT0]		= 7,
+	[IRQ_PWMINT1]		= 7,
+	[IRQ_PWMINT2]		= 7,
+	[IRQ_I2C]		= 3,
+	[IRQ_UARTINT0]		= 3,
+	[IRQ_UARTINT1]		= 3,
+	[IRQ_UARTINT2]		= 3,
+	[IRQ_SPINT0]		= 3,
+	[IRQ_SPINT1]		= 3,
+	[45]			= 7,
+	[IRQ_DSP2ARM0]		= 4,
+	[IRQ_DSP2ARM1]		= 4,
+	[IRQ_GPIO0]		= 7,
+	[IRQ_GPIO1]		= 7,
+	[IRQ_GPIO2]		= 7,
+	[IRQ_GPIO3]		= 7,
+	[IRQ_GPIO4]		= 7,
+	[IRQ_GPIO5]		= 7,
+	[IRQ_GPIO6]		= 7,
+	[IRQ_GPIO7]		= 7,
+	[IRQ_GPIOBNK0]		= 7,
+	[IRQ_GPIOBNK1]		= 7,
+	[IRQ_GPIOBNK2]		= 7,
+	[IRQ_GPIOBNK3]		= 7,
+	[IRQ_GPIOBNK4]		= 7,
+	[IRQ_COMMTX]		= 7,
+	[IRQ_COMMRX]		= 7,
+	[IRQ_EMUINT]		= 7,
+};
+
+/* ARM Interrupt Controller Initialization */
+void __init davinci_irq_init(void)
+{
+	unsigned i;
+	const u8 *priority = default_priorities;
+
+	/* Clear all interrupt requests */
+	davinci_irq_writel(~0x0, FIQ_REG0_OFFSET);
+	davinci_irq_writel(~0x0, FIQ_REG1_OFFSET);
+	davinci_irq_writel(~0x0, IRQ_REG0_OFFSET);
+	davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
+
+	/* Disable all interrupts */
+	davinci_irq_writel(0x0, IRQ_ENT_REG0_OFFSET);
+	davinci_irq_writel(0x0, IRQ_ENT_REG1_OFFSET);
+
+	/* Interrupts disabled immediately, IRQ entry reflects all */
+	davinci_irq_writel(0x0, IRQ_INCTL_REG_OFFSET);
+
+	/* we don't use the hardware vector table, just its entry addresses */
+	davinci_irq_writel(0, IRQ_EABASE_REG_OFFSET);
+
+	/* Clear all interrupt requests */
+	davinci_irq_writel(~0x0, FIQ_REG0_OFFSET);
+	davinci_irq_writel(~0x0, FIQ_REG1_OFFSET);
+	davinci_irq_writel(~0x0, IRQ_REG0_OFFSET);
+	davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
+
+	for (i = IRQ_INTPRI0_REG_OFFSET; i <= IRQ_INTPRI7_REG_OFFSET; i += 4) {
+		unsigned	j;
+		u32		pri;
+
+		for (j = 0, pri = 0; j < 32; j += 4, priority++)
+			pri |= (*priority & 0x07) << j;
+		davinci_irq_writel(pri, i);
+	}
+
+	/* set up genirq dispatch for ARM INTC */
+	for (i = 0; i < DAVINCI_N_AINTC_IRQ; i++) {
+		set_irq_chip(i, &davinci_irq_chip_0);
+		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+		if (i != IRQ_TINT1_TINT34)
+			set_irq_handler(i, handle_edge_irq);
+		else
+			set_irq_handler(i, handle_level_irq);
+	}
+}