From 83850b04ae7744f51681533fb7afb645e66ce8fe Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Thu, 12 Jun 2014 10:42:22 +0200 Subject: ARM: shmobile: rcar-gen2: Update for of_get_flat_dt_prop() update Commit 9d0c4dfedd96ee54fc075b16d02f82499c8cc3a6 ("of/fdt: update of_get_flat_dt_prop in prep for libfdt") changed the function prototypes of of_get_flat_dt_prop(): - The return type was made const, - The last parameter was changed from "unsigned long *" to "int *". and dt_mem_next_cell(): - The second parameter was made const. This causes the following compiler warnings: arch/arm/mach-shmobile/setup-rcar-gen2.c: In function 'rcar_gen2_scan_mem': arch/arm/mach-shmobile/setup-rcar-gen2.c:125:15: warning: initialization discards 'const' qualifier from pointer target type [enabled by default] arch/arm/mach-shmobile/setup-rcar-gen2.c:142:2: warning: passing argument 3 of 'of_get_flat_dt_prop' from incompatible pointer type [enabled by default] include/linux/of_fdt.h:53:20: note: expected 'int *' but argument is of type 'long unsigned int *' arch/arm/mach-shmobile/setup-rcar-gen2.c:142:6: warning: assignment discards 'const' qualifier from pointer target type [enabled by default] arch/arm/mach-shmobile/setup-rcar-gen2.c:144:3: warning: passing argument 3 of 'of_get_flat_dt_prop' from incompatible pointer type [enabled by default] include/linux/of_fdt.h:53:20: note: expected 'int *' but argument is of type 'long unsigned int *' arch/arm/mach-shmobile/setup-rcar-gen2.c:144:7: warning: assignment discards 'const' qualifier from pointer target type [enabled by default] arch/arm/mach-shmobile/setup-rcar-gen2.c:152:3: warning: passing argument 2 of 'dt_mem_next_cell' from incompatible pointer type [enabled by default] include/linux/of_fdt.h:69:12: note: expected 'const __be32 **' but argument is of type '__be32 **' arch/arm/mach-shmobile/setup-rcar-gen2.c:153:3: warning: passing argument 2 of 'dt_mem_next_cell' from incompatible pointer type [enabled by default] include/linux/of_fdt.h:69:12: note: expected 'const __be32 **' but argument is of type '__be32 **' Update the variable types in rcar_gen2_scan_mem() to fix this. Signed-off-by: Geert Uytterhoeven Acked-by: Magnus Damm [horms+renesas@verge.net.au: rebased] Signed-off-by: Simon Horman --- arch/arm/mach-shmobile/setup-rcar-gen2.c | 76 ++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) (limited to 'arch/arm/mach-shmobile/setup-rcar-gen2.c') diff --git a/arch/arm/mach-shmobile/setup-rcar-gen2.c b/arch/arm/mach-shmobile/setup-rcar-gen2.c index 544b9bf28840..b0626f89d7a6 100644 --- a/arch/arm/mach-shmobile/setup-rcar-gen2.c +++ b/arch/arm/mach-shmobile/setup-rcar-gen2.c @@ -113,3 +113,79 @@ void __init rcar_gen2_timer_init(void) #endif clocksource_of_init(); } + +struct memory_reserve_config { + u64 reserved; + u64 base, size; +}; + +static int __init rcar_gen2_scan_mem(unsigned long node, const char *uname, + int depth, void *data) +{ + const char *type = of_get_flat_dt_prop(node, "device_type", NULL); + const __be32 *reg, *endp; + int l; + struct memory_reserve_config *mrc = data; + u64 lpae_start = (u64)1 << 32; + + /* We are scanning "memory" nodes only */ + if (type == NULL) { + /* + * The longtrail doesn't have a device_type on the + * /memory node, so look for the node called /memory@0. + */ + if (depth != 1 || strcmp(uname, "memory@0") != 0) + return 0; + } else if (strcmp(type, "memory") != 0) + return 0; + + reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); + if (reg == NULL) + reg = of_get_flat_dt_prop(node, "reg", &l); + if (reg == NULL) + return 0; + + endp = reg + (l / sizeof(__be32)); + while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { + u64 base, size; + + base = dt_mem_next_cell(dt_root_addr_cells, ®); + size = dt_mem_next_cell(dt_root_size_cells, ®); + + if (base >= lpae_start) + continue; + + if ((base + size) >= lpae_start) + size = lpae_start - base; + + if (size < mrc->reserved) + continue; + + if (base < mrc->base) + continue; + + /* keep the area at top near the 32-bit legacy limit */ + mrc->base = base + size - mrc->reserved; + mrc->size = mrc->reserved; + } + + return 0; +} + +struct cma *rcar_gen2_dma_contiguous; + +void __init rcar_gen2_reserve(void) +{ + struct memory_reserve_config mrc; + + /* reserve 256 MiB at the top of the physical legacy 32-bit space */ + memset(&mrc, 0, sizeof(mrc)); + mrc.reserved = SZ_256M; + + of_scan_flat_dt(rcar_gen2_scan_mem, &mrc); +#ifdef CONFIG_DMA_CMA + if (mrc.size) + dma_contiguous_reserve_area(mrc.size, mrc.base, 0, + &rcar_gen2_dma_contiguous); +#endif +} -- cgit v1.2.3