From 45d9108011b9dfb4fccd6c258290d2185145709b Mon Sep 17 00:00:00 2001
From: dmitry pervushin <dpervushin@embeddedalley.com>
Date: Wed, 22 Apr 2009 23:57:05 +0100
Subject: [ARM] 5465/1: Freescale STMP platform support [7/10]

Sources: support for 37xx boards

Signed-off-by: dmitry pervushin <dpervushin@embeddedalley.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/mach-stmp37xx/stmp37xx.c | 217 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 217 insertions(+)
 create mode 100644 arch/arm/mach-stmp37xx/stmp37xx.c

(limited to 'arch/arm/mach-stmp37xx/stmp37xx.c')

diff --git a/arch/arm/mach-stmp37xx/stmp37xx.c b/arch/arm/mach-stmp37xx/stmp37xx.c
new file mode 100644
index 000000000000..83a41c90c252
--- /dev/null
+++ b/arch/arm/mach-stmp37xx/stmp37xx.c
@@ -0,0 +1,217 @@
+/*
+ * Freescale STMP37XX platform support
+ *
+ * Embedded Alley Solutions, Inc <source@embeddedalley.com>
+ *
+ * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <asm/setup.h>
+#include <asm/mach-types.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/irq.h>
+#include <asm/mach/map.h>
+#include <asm/mach/time.h>
+
+#include <mach/stmp3xxx.h>
+#include <mach/dma.h>
+
+#include <mach/regs-icoll.h>
+#include <mach/regs-apbh.h>
+#include <mach/regs-apbx.h>
+#include "stmp37xx.h"
+
+/*
+ * IRQ handling
+ */
+static void stmp37xx_ack_irq(unsigned int irq)
+{
+	/* Disable IRQ */
+	HW_ICOLL_PRIORITYn_CLR(irq / 4, 0x04 << ((irq % 4) * 8));
+
+	/* ACK current interrupt */
+	HW_ICOLL_LEVELACK_WR(1);
+
+	/* Barrier */
+	(void) HW_ICOLL_STAT_RD();
+}
+
+static void stmp37xx_mask_irq(unsigned int irq)
+{
+	/* IRQ disable */
+	HW_ICOLL_PRIORITYn_CLR(irq / 4, 0x04 << ((irq % 4) * 8));
+}
+
+static void stmp37xx_unmask_irq(unsigned int irq)
+{
+	/* IRQ enable */
+	HW_ICOLL_PRIORITYn_SET(irq / 4, 0x04 << ((irq % 4) * 8));
+}
+
+static struct irq_chip stmp37xx_chip = {
+	.ack	= stmp37xx_ack_irq,
+	.mask	= stmp37xx_mask_irq,
+	.unmask = stmp37xx_unmask_irq,
+};
+
+void __init stmp37xx_init_irq(void)
+{
+	stmp3xxx_init_irq(&stmp37xx_chip);
+}
+
+/*
+ * DMA interrupt handling
+ */
+void stmp3xxx_arch_dma_enable_interrupt(int channel)
+{
+	int dmabus = channel / 16;
+
+	switch (dmabus) {
+	case STMP3XXX_BUS_APBH:
+		HW_APBH_CTRL1_SET(1 << (8 + (channel % 16)));
+		break;
+
+	case STMP3XXX_BUS_APBX:
+		HW_APBX_CTRL1_SET(1 << (8 + (channel % 16)));
+		break;
+	}
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_enable_interrupt);
+
+void stmp3xxx_arch_dma_clear_interrupt(int channel)
+{
+	int dmabus = channel / 16;
+
+	switch (dmabus) {
+	case STMP3XXX_BUS_APBH:
+		HW_APBH_CTRL1_CLR(1 << (channel % 16));
+		break;
+
+	case STMP3XXX_BUS_APBX:
+		HW_APBX_CTRL1_CLR(1 << (channel % 16));
+		break;
+	}
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_clear_interrupt);
+
+int stmp3xxx_arch_dma_is_interrupt(int channel)
+{
+	int r = 0;
+
+	int dmabus = channel / 16;
+
+	switch (dmabus) {
+	case STMP3XXX_BUS_APBH:
+		r = HW_APBH_CTRL1_RD() & (1 << (channel % 16));
+		break;
+
+	case STMP3XXX_BUS_APBX:
+		r = HW_APBX_CTRL1_RD() & (1 << (channel % 16));
+		break;
+	}
+	return r;
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_is_interrupt);
+
+void stmp3xxx_arch_dma_reset_channel(int channel)
+{
+	int dmabus = channel / 16;
+	unsigned chbit = 1 << (channel % 16);
+
+	switch (dmabus) {
+	case STMP3XXX_BUS_APBH:
+		/* Reset channel and wait for it to complete */
+		HW_APBH_CTRL0_SET(chbit << BP_APBH_CTRL0_RESET_CHANNEL);
+		while (HW_APBH_CTRL0_RD() &
+		       (chbit << BP_APBH_CTRL0_RESET_CHANNEL))
+			continue;
+		break;
+
+	case STMP3XXX_BUS_APBX:
+		/* Reset channel and wait for it to complete */
+		HW_APBX_CTRL0_SET(chbit << BP_APBX_CTRL0_RESET_CHANNEL);
+		while (HW_APBX_CTRL0_RD() &
+		       (chbit << BP_APBX_CTRL0_RESET_CHANNEL))
+			continue;
+		break;
+	}
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_reset_channel);
+
+void stmp3xxx_arch_dma_freeze(int channel)
+{
+	int dmabus = channel / 16;
+	unsigned chbit = 1 << (channel % 16);
+
+	switch (dmabus) {
+	case STMP3XXX_BUS_APBH:
+		HW_APBH_CTRL0_SET(1<<chbit);
+		break;
+	case STMP3XXX_BUS_APBX:
+		HW_APBX_CTRL0_SET(1<<chbit);
+		break;
+	}
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_freeze);
+
+void stmp3xxx_arch_dma_unfreeze(int channel)
+{
+	int dmabus = channel / 16;
+	unsigned chbit = 1 << (channel % 16);
+
+	switch (dmabus) {
+	case STMP3XXX_BUS_APBH:
+		HW_APBH_CTRL0_CLR(1<<chbit);
+		break;
+	case STMP3XXX_BUS_APBX:
+		HW_APBX_CTRL0_CLR(1<<chbit);
+		break;
+	}
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_unfreeze);
+
+/*
+ * The registers are all very closely mapped, so we might as well map them all
+ * with a single mapping
+ *
+ * Logical      Physical
+ * f0000000	80000000	On-chip registers
+ * f1000000	00000000	256k on-chip SRAM
+ */
+static struct map_desc stmp37xx_io_desc[] __initdata = {
+	{
+		.virtual	= (u32)STMP3XXX_REGS_BASE,
+		.pfn		= __phys_to_pfn(STMP3XXX_REGS_PHBASE),
+		.length		= SZ_1M,
+		.type		= MT_DEVICE
+	},
+	{
+		.virtual	= (u32)STMP3XXX_OCRAM_BASE,
+		.pfn		= __phys_to_pfn(STMP3XXX_OCRAM_PHBASE),
+		.length		= STMP3XXX_OCRAM_SIZE,
+		.type		= MT_DEVICE,
+	},
+};
+
+void __init stmp37xx_map_io(void)
+{
+	iotable_init(stmp37xx_io_desc, ARRAY_SIZE(stmp37xx_io_desc));
+}
-- 
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