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-rw-r--r--arch/arm/mach-stmp378x/stmp378x.c299
1 files changed, 299 insertions, 0 deletions
diff --git a/arch/arm/mach-stmp378x/stmp378x.c b/arch/arm/mach-stmp378x/stmp378x.c
new file mode 100644
index 000000000000..ddd49a760fd4
--- /dev/null
+++ b/arch/arm/mach-stmp378x/stmp378x.c
@@ -0,0 +1,299 @@
+/*
+ * Freescale STMP378X 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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/dma.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/pins.h>
+#include <mach/pinmux.h>
+#include <mach/dma.h>
+#include <mach/hardware.h>
+#include <mach/system.h>
+#include <mach/platform.h>
+#include <mach/stmp3xxx.h>
+#include <mach/regs-icoll.h>
+#include <mach/regs-apbh.h>
+#include <mach/regs-apbx.h>
+#include <mach/regs-pxp.h>
+#include <mach/regs-i2c.h>
+
+#include "stmp378x.h"
+/*
+ * IRQ handling
+ */
+static void stmp378x_ack_irq(unsigned int irq)
+{
+ /* Tell ICOLL to release IRQ line */
+ __raw_writel(0, REGS_ICOLL_BASE + HW_ICOLL_VECTOR);
+
+ /* ACK current interrupt */
+ __raw_writel(0x01 /* BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0 */,
+ REGS_ICOLL_BASE + HW_ICOLL_LEVELACK);
+
+ /* Barrier */
+ (void)__raw_readl(REGS_ICOLL_BASE + HW_ICOLL_STAT);
+}
+
+static void stmp378x_mask_irq(unsigned int irq)
+{
+ /* IRQ disable */
+ stmp3xxx_clearl(BM_ICOLL_INTERRUPTn_ENABLE,
+ REGS_ICOLL_BASE + HW_ICOLL_INTERRUPTn + irq * 0x10);
+}
+
+static void stmp378x_unmask_irq(unsigned int irq)
+{
+ /* IRQ enable */
+ stmp3xxx_setl(BM_ICOLL_INTERRUPTn_ENABLE,
+ REGS_ICOLL_BASE + HW_ICOLL_INTERRUPTn + irq * 0x10);
+}
+
+static struct irq_chip stmp378x_chip = {
+ .ack = stmp378x_ack_irq,
+ .mask = stmp378x_mask_irq,
+ .unmask = stmp378x_unmask_irq,
+};
+
+void __init stmp378x_init_irq(void)
+{
+ stmp3xxx_init_irq(&stmp378x_chip);
+}
+
+/*
+ * DMA interrupt handling
+ */
+void stmp3xxx_arch_dma_enable_interrupt(int channel)
+{
+ void __iomem *c1, *c2;
+
+ switch (STMP3XXX_DMA_BUS(channel)) {
+ case STMP3XXX_BUS_APBH:
+ c1 = REGS_APBH_BASE + HW_APBH_CTRL1;
+ c2 = REGS_APBH_BASE + HW_APBH_CTRL2;
+ break;
+
+ case STMP3XXX_BUS_APBX:
+ c1 = REGS_APBX_BASE + HW_APBX_CTRL1;
+ c2 = REGS_APBX_BASE + HW_APBX_CTRL2;
+ break;
+
+ default:
+ return;
+ }
+ stmp3xxx_setl(1 << (16 + STMP3XXX_DMA_CHANNEL(channel)), c1);
+ stmp3xxx_setl(1 << (16 + STMP3XXX_DMA_CHANNEL(channel)), c2);
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_enable_interrupt);
+
+void stmp3xxx_arch_dma_clear_interrupt(int channel)
+{
+ void __iomem *c1, *c2;
+
+ switch (STMP3XXX_DMA_BUS(channel)) {
+ case STMP3XXX_BUS_APBH:
+ c1 = REGS_APBH_BASE + HW_APBH_CTRL1;
+ c2 = REGS_APBH_BASE + HW_APBH_CTRL2;
+ break;
+
+ case STMP3XXX_BUS_APBX:
+ c1 = REGS_APBX_BASE + HW_APBX_CTRL1;
+ c2 = REGS_APBX_BASE + HW_APBX_CTRL2;
+ break;
+
+ default:
+ return;
+ }
+ stmp3xxx_clearl(1 << STMP3XXX_DMA_CHANNEL(channel), c1);
+ stmp3xxx_clearl(1 << STMP3XXX_DMA_CHANNEL(channel), c2);
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_clear_interrupt);
+
+int stmp3xxx_arch_dma_is_interrupt(int channel)
+{
+ int r = 0;
+
+ switch (STMP3XXX_DMA_BUS(channel)) {
+ case STMP3XXX_BUS_APBH:
+ r = __raw_readl(REGS_APBH_BASE + HW_APBH_CTRL1) &
+ (1 << STMP3XXX_DMA_CHANNEL(channel));
+ break;
+
+ case STMP3XXX_BUS_APBX:
+ r = __raw_readl(REGS_APBX_BASE + HW_APBX_CTRL1) &
+ (1 << STMP3XXX_DMA_CHANNEL(channel));
+ break;
+ }
+ return r;
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_is_interrupt);
+
+void stmp3xxx_arch_dma_reset_channel(int channel)
+{
+ unsigned chbit = 1 << STMP3XXX_DMA_CHANNEL(channel);
+ void __iomem *c0;
+ u32 mask;
+
+ switch (STMP3XXX_DMA_BUS(channel)) {
+ case STMP3XXX_BUS_APBH:
+ c0 = REGS_APBH_BASE + HW_APBH_CTRL0;
+ mask = chbit << BP_APBH_CTRL0_RESET_CHANNEL;
+ break;
+ case STMP3XXX_BUS_APBX:
+ c0 = REGS_APBX_BASE + HW_APBX_CHANNEL_CTRL;
+ mask = chbit << BP_APBX_CHANNEL_CTRL_RESET_CHANNEL;
+ break;
+ default:
+ return;
+ }
+
+ /* Reset channel and wait for it to complete */
+ stmp3xxx_setl(mask, c0);
+ while (__raw_readl(c0) & mask)
+ cpu_relax();
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_reset_channel);
+
+void stmp3xxx_arch_dma_freeze(int channel)
+{
+ unsigned chbit = 1 << STMP3XXX_DMA_CHANNEL(channel);
+ u32 mask = 1 << chbit;
+
+ switch (STMP3XXX_DMA_BUS(channel)) {
+ case STMP3XXX_BUS_APBH:
+ stmp3xxx_setl(mask, REGS_APBH_BASE + HW_APBH_CTRL0);
+ break;
+ case STMP3XXX_BUS_APBX:
+ stmp3xxx_setl(mask, REGS_APBX_BASE + HW_APBX_CHANNEL_CTRL);
+ break;
+ }
+}
+EXPORT_SYMBOL(stmp3xxx_arch_dma_freeze);
+
+void stmp3xxx_arch_dma_unfreeze(int channel)
+{
+ unsigned chbit = 1 << STMP3XXX_DMA_CHANNEL(channel);
+ u32 mask = 1 << chbit;
+
+ switch (STMP3XXX_DMA_BUS(channel)) {
+ case STMP3XXX_BUS_APBH:
+ stmp3xxx_clearl(mask, REGS_APBH_BASE + HW_APBH_CTRL0);
+ break;
+ case STMP3XXX_BUS_APBX:
+ stmp3xxx_clearl(mask, REGS_APBX_BASE + HW_APBX_CHANNEL_CTRL);
+ 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 32k on-chip SRAM
+ */
+
+static struct map_desc stmp378x_io_desc[] __initdata = {
+ {
+ .virtual = (u32)STMP3XXX_REGS_BASE,
+ .pfn = __phys_to_pfn(STMP3XXX_REGS_PHBASE),
+ .length = STMP3XXX_REGS_SIZE,
+ .type = MT_DEVICE,
+ },
+ {
+ .virtual = (u32)STMP3XXX_OCRAM_BASE,
+ .pfn = __phys_to_pfn(STMP3XXX_OCRAM_PHBASE),
+ .length = STMP3XXX_OCRAM_SIZE,
+ .type = MT_DEVICE,
+ },
+};
+
+
+static u64 common_dmamask = DMA_BIT_MASK(32);
+
+/*
+ * devices that are present only on stmp378x, not on all 3xxx boards:
+ * PxP
+ * I2C
+ */
+static struct resource pxp_resource[] = {
+ {
+ .flags = IORESOURCE_MEM,
+ .start = REGS_PXP_PHYS,
+ .end = REGS_PXP_PHYS + REGS_PXP_SIZE,
+ }, {
+ .flags = IORESOURCE_IRQ,
+ .start = IRQ_PXP,
+ .end = IRQ_PXP,
+ },
+};
+
+struct platform_device stmp378x_pxp = {
+ .name = "stmp3xxx-pxp",
+ .id = -1,
+ .dev = {
+ .dma_mask = &common_dmamask,
+ .coherent_dma_mask = DMA_BIT_MASK(32),
+ },
+ .num_resources = ARRAY_SIZE(pxp_resource),
+ .resource = pxp_resource,
+};
+
+static struct resource i2c_resources[] = {
+ {
+ .flags = IORESOURCE_IRQ,
+ .start = IRQ_I2C_ERROR,
+ .end = IRQ_I2C_ERROR,
+ }, {
+ .flags = IORESOURCE_MEM,
+ .start = REGS_I2C_PHYS,
+ .end = REGS_I2C_PHYS + REGS_I2C_SIZE,
+ }, {
+ .flags = IORESOURCE_DMA,
+ .start = STMP3XXX_DMA(3, STMP3XXX_BUS_APBX),
+ .end = STMP3XXX_DMA(3, STMP3XXX_BUS_APBX),
+ },
+};
+
+struct platform_device stmp378x_i2c = {
+ .name = "i2c_stmp3xxx",
+ .id = 0,
+ .dev = {
+ .dma_mask = &common_dmamask,
+ .coherent_dma_mask = DMA_BIT_MASK(32),
+ },
+ .resource = i2c_resources,
+ .num_resources = ARRAY_SIZE(i2c_resources),
+};
+
+void __init stmp378x_map_io(void)
+{
+ iotable_init(stmp378x_io_desc, ARRAY_SIZE(stmp378x_io_desc));
+}