diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-realview/Kconfig | 5 | ||||
| -rw-r--r-- | arch/arm/mach-realview/core.c | 21 | ||||
| -rw-r--r-- | arch/arm/mach-realview/include/mach/memory.h | 49 | ||||
| -rw-r--r-- | arch/arm/mach-realview/realview_pbx.c | 22 |
4 files changed, 94 insertions, 3 deletions
diff --git a/arch/arm/mach-realview/Kconfig b/arch/arm/mach-realview/Kconfig index dfc9b0bc6eb2..c48e1f2c3349 100644 --- a/arch/arm/mach-realview/Kconfig +++ b/arch/arm/mach-realview/Kconfig @@ -70,6 +70,8 @@ config MACH_REALVIEW_PBX bool "Support RealView/PBX platform" select ARM_GIC select HAVE_PATA_PLATFORM + select ARCH_SPARSEMEM_ENABLE if CPU_V7 && !HIGH_PHYS_OFFSET + select ZONE_DMA if SPARSEMEM help Include support for the ARM(R) RealView PBX platform. @@ -82,6 +84,7 @@ config REALVIEW_HIGH_PHYS_OFFSET 0x70000000, 256MB of which being mirrored at 0x00000000. If the board supports 512MB of RAM, this option allows the memory to be accessed contiguously at the high physical - offset. + offset. On the PBX board, disabling this option allows 1GB of + RAM to be used with SPARSEMEM. endmenu diff --git a/arch/arm/mach-realview/core.c b/arch/arm/mach-realview/core.c index c21b0fd39652..9f293438e020 100644 --- a/arch/arm/mach-realview/core.c +++ b/arch/arm/mach-realview/core.c @@ -59,6 +59,25 @@ /* used by entry-macro.S and platsmp.c */ void __iomem *gic_cpu_base_addr; +#ifdef CONFIG_ZONE_DMA +/* + * Adjust the zones if there are restrictions for DMA access. + */ +void __init realview_adjust_zones(int node, unsigned long *size, + unsigned long *hole) +{ + unsigned long dma_size = SZ_256M >> PAGE_SHIFT; + + if (!machine_is_realview_pbx() || node || (size[0] <= dma_size)) + return; + + size[ZONE_NORMAL] = size[0] - dma_size; + size[ZONE_DMA] = dma_size; + hole[ZONE_NORMAL] = hole[0]; + hole[ZONE_DMA] = 0; +} +#endif + /* * This is the RealView sched_clock implementation. This has * a resolution of 41.7ns, and a maximum value of about 179s. @@ -543,7 +562,7 @@ static int realview_clcd_setup(struct clcd_fb *fb) fb->panel = realview_clcd_panel(); fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, framesize, - &dma, GFP_KERNEL); + &dma, GFP_KERNEL | GFP_DMA); if (!fb->fb.screen_base) { printk(KERN_ERR "CLCD: unable to map framebuffer\n"); return -ENOMEM; diff --git a/arch/arm/mach-realview/include/mach/memory.h b/arch/arm/mach-realview/include/mach/memory.h index 293c30025e7e..2417bbcf97fd 100644 --- a/arch/arm/mach-realview/include/mach/memory.h +++ b/arch/arm/mach-realview/include/mach/memory.h @@ -29,4 +29,53 @@ #define PHYS_OFFSET UL(0x00000000) #endif +#if !defined(__ASSEMBLY__) && defined(CONFIG_ZONE_DMA) +extern void realview_adjust_zones(int node, unsigned long *size, + unsigned long *hole); +#define arch_adjust_zones(node, size, hole) \ + realview_adjust_zones(node, size, hole) + +#define ISA_DMA_THRESHOLD (PHYS_OFFSET + SZ_256M - 1) +#define MAX_DMA_ADDRESS (PAGE_OFFSET + SZ_256M) +#endif + +#ifdef CONFIG_SPARSEMEM + +/* + * Sparsemem definitions for RealView PBX. + * + * The RealView PBX board has another block of 512MB of RAM at 0x20000000, + * however only the block at 0x70000000 (or the 256MB mirror at 0x00000000) + * may be used for DMA. + * + * The macros below define a section size of 256MB and a non-linear virtual to + * physical mapping: + * + * 256MB @ 0x00000000 -> PAGE_OFFSET + * 512MB @ 0x20000000 -> PAGE_OFFSET + 0x10000000 + * 256MB @ 0x80000000 -> PAGE_OFFSET + 0x30000000 + */ +#ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET +#error "SPARSEMEM not available with REALVIEW_HIGH_PHYS_OFFSET" +#endif + +#define MAX_PHYSMEM_BITS 32 +#define SECTION_SIZE_BITS 28 + +/* bank page offsets */ +#define PAGE_OFFSET1 (PAGE_OFFSET + 0x10000000) +#define PAGE_OFFSET2 (PAGE_OFFSET + 0x30000000) + +#define __phys_to_virt(phys) \ + ((phys) >= 0x80000000 ? (phys) - 0x80000000 + PAGE_OFFSET2 : \ + (phys) >= 0x20000000 ? (phys) - 0x20000000 + PAGE_OFFSET1 : \ + (phys) + PAGE_OFFSET) + +#define __virt_to_phys(virt) \ + ((virt) >= PAGE_OFFSET2 ? (virt) - PAGE_OFFSET2 + 0x80000000 : \ + (virt) >= PAGE_OFFSET1 ? (virt) - PAGE_OFFSET1 + 0x20000000 : \ + (virt) - PAGE_OFFSET) + +#endif /* CONFIG_SPARSEMEM */ + #endif diff --git a/arch/arm/mach-realview/realview_pbx.c b/arch/arm/mach-realview/realview_pbx.c index 5d09d8b4a1cb..ec39488e2b42 100644 --- a/arch/arm/mach-realview/realview_pbx.c +++ b/arch/arm/mach-realview/realview_pbx.c @@ -304,6 +304,26 @@ static struct sys_timer realview_pbx_timer = { .init = realview_pbx_timer_init, }; +static void realview_pbx_fixup(struct machine_desc *mdesc, struct tag *tags, + char **from, struct meminfo *meminfo) +{ +#ifdef CONFIG_SPARSEMEM + /* + * Memory configuration with SPARSEMEM enabled on RealView PBX (see + * asm/mach/memory.h for more information). + */ + meminfo->bank[0].start = 0; + meminfo->bank[0].size = SZ_256M; + meminfo->bank[1].start = 0x20000000; + meminfo->bank[1].size = SZ_512M; + meminfo->bank[2].start = 0x80000000; + meminfo->bank[2].size = SZ_256M; + meminfo->nr_banks = 3; +#else + realview_fixup(mdesc, tags, from, meminfo); +#endif +} + static void __init realview_pbx_init(void) { int i; @@ -345,7 +365,7 @@ MACHINE_START(REALVIEW_PBX, "ARM-RealView PBX") .phys_io = REALVIEW_PBX_UART0_BASE, .io_pg_offst = (IO_ADDRESS(REALVIEW_PBX_UART0_BASE) >> 18) & 0xfffc, .boot_params = PHYS_OFFSET + 0x00000100, - .fixup = realview_fixup, + .fixup = realview_pbx_fixup, .map_io = realview_pbx_map_io, .init_irq = gic_init_irq, .timer = &realview_pbx_timer, |