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

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

1 files changed, 83 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/io.c b/arch/arm/plat-omap/io.c
new file mode 100644
index 000000000000..0253c456ed5b
--- /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);