[ARM] omap: allow ioremap() to use our fixed IO mappings

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 90 insertions, 1 deletions

diff --git a/arch/arm/plat-omap/Makefile b/arch/arm/plat-omap/Makefile
index 2c4051cc79a..deaff58878a 100644
--- a/arch/arm/plat-omap/Makefile
+++ b/arch/arm/plat-omap/Makefile
@@ -4,7 +4,7 @@
 
 # Common support
 obj-y := common.o sram.o clock.o devices.o dma.o mux.o gpio.o \
-	 usb.o fb.o
+	 usb.o fb.o io.o
 obj-m :=
 obj-n :=
 obj-  :=
diff --git a/arch/arm/plat-omap/include/mach/io.h b/arch/arm/plat-omap/include/mach/io.h
index 2a30b7d88cd..b9f57ce0ac1 100644
--- a/arch/arm/plat-omap/include/mach/io.h
+++ b/arch/arm/plat-omap/include/mach/io.h
@@ -192,6 +192,12 @@ extern void omap1_init_common_hw(void);
 extern void omap2_map_common_io(void);
 extern void omap2_init_common_hw(void);
 
+#define __arch_ioremap(p,s,t)	omap_ioremap(p,s,t)
+#define __arch_iounmap(v)	omap_iounmap(v)
+
+void __iomem *omap_ioremap(unsigned long phys, size_t size, unsigned int type);
+void omap_iounmap(volatile void __iomem *addr);
+
 #endif
 
 #endif
diff --git a/arch/arm/plat-omap/io.c b/arch/arm/plat-omap/io.c
new file mode 100644
index 00000000000..0253c456ed5
--- /dev/null
+++ b/arch/arm/plat-omap/io.c
@@ -0,0 +1,83 @@
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+
+#include <mach/omap730.h>
+#include <mach/omap1510.h>
+#include <mach/omap16xx.h>
+#include <mach/omap24xx.h>
+#include <mach/omap34xx.h>
+
+#define BETWEEN(p,st,sz)	((p) >= (st) && (p) < ((st) + (sz)))
+#define XLATE(p,pst,vst)	((void __iomem *)((p) - (pst) + (vst)))
+
+/*
+ * Intercept ioremap() requests for addresses in our fixed mapping regions.
+ */
+void __iomem *omap_ioremap(unsigned long p, size_t size, unsigned int type)
+{
+#ifdef CONFIG_ARCH_OMAP1
+	if (cpu_class_is_omap1()) {
+		if (BETWEEN(p, IO_PHYS, IO_SIZE))
+			return XLATE(p, IO_PHYS, IO_VIRT);
+	}
+	if (cpu_is_omap730()) {
+		if (BETWEEN(p, OMAP730_DSP_BASE, OMAP730_DSP_SIZE))
+			return XLATE(p, OMAP730_DSP_BASE, OMAP730_DSP_START);
+
+		if (BETWEEN(p, OMAP730_DSPREG_BASE, OMAP730_DSPREG_SIZE))
+			return XLATE(p, OMAP730_DSPREG_BASE,
+					OMAP730_DSPREG_START);
+	}
+	if (cpu_is_omap15xx()) {
+		if (BETWEEN(p, OMAP1510_DSP_BASE, OMAP1510_DSP_SIZE))
+			return XLATE(p, OMAP1510_DSP_BASE, OMAP1510_DSP_START);
+
+		if (BETWEEN(p, OMAP1510_DSPREG_BASE, OMAP1510_DSPREG_SIZE))
+			return XLATE(p, OMAP1510_DSPREG_BASE,
+					OMAP1510_DSPREG_START);
+	}
+	if (cpu_is_omap16xx()) {
+		if (BETWEEN(p, OMAP16XX_DSP_BASE, OMAP16XX_DSP_SIZE))
+			return XLATE(p, OMAP16XX_DSP_BASE, OMAP16XX_DSP_START);
+
+		if (BETWEEN(p, OMAP16XX_DSPREG_BASE, OMAP16XX_DSPREG_SIZE))
+			return XLATE(p, OMAP16XX_DSPREG_BASE,
+					OMAP16XX_DSPREG_START);
+	}
+#endif
+#ifdef CONFIG_ARCH_OMAP2
+	if (cpu_class_is_omap2()) {
+		if (BETWEEN(p, L3_24XX_PHYS, L3_24XX_SIZE))
+			return XLATE(p, L3_24XX_PHYS, L3_24XX_VIRT);
+		if (BETWEEN(p, L4_24XX_PHYS, L4_24XX_SIZE))
+			return XLATE(p, L4_24XX_PHYS, L4_24XX_VIRT);
+		if (BETWEEN(p, DSP_MEM_24XX_PHYS, DSP_MEM_24XX_SIZE))
+			return XLATE(p, DSP_MEM_24XX_PHYS, DSP_MEM_24XX_VIRT);
+		if (BETWEEN(p, DSP_IPI_24XX_PHYS, DSP_IPI_24XX_SIZE))
+			return XLATE(p, DSP_IPI_24XX_PHYS, DSP_IPI_24XX_SIZE);
+		if (BETWEEN(p, DSP_MMU_24XX_PHYS, DSP_MMU_24XX_SIZE))
+			return XLATE(p, DSP_MMU_24XX_PHYS, DSP_MMU_24XX_VIRT);
+	}
+#ifdef CONFIG_ARCH_OMAP2430
+	if (cpu_is_omap2430()) {
+		if (BETWEEN(p, L4_WK_243X_PHYS, L4_WK_243X_SIZE))
+			return XLATE(L4_WK_243X_PHYS, L4_WK_243X_VIRT);
+		if (BETWEEN(p, OMAP243X_GPMC_PHYS, OMAP243X_GPMC_SIZE))
+			return XLATE(OMAP243X_GPMC_PHYS, OMAP243X_GPMC_VIRT);
+	}
+#endif
+#endif
+
+	return __arm_ioremap(p, size, type);
+}
+EXPORT_SYMBOL(omap_ioremap);
+
+void omap_iounmap(volatile void __iomem *addr)
+{
+	unsigned long virt = (unsigned long)addr;
+
+	if (virt >= VMALLOC_START && virt < VMALLOC_END)
+		__iounmap(addr);
+}
+EXPORT_SYMBOL(omap_iounmap);