diff options
| -rw-r--r-- | arch/arc/Kconfig | 12 | ||||
| -rw-r--r-- | arch/arc/boot/dts/skeleton.dtsi | 6 | ||||
| -rw-r--r-- | arch/arc/include/asm/clk.h | 2 | ||||
| -rw-r--r-- | arch/arc/kernel/clk.c | 12 | ||||
| -rw-r--r-- | arch/arc/kernel/devtree.c | 13 | ||||
| -rw-r--r-- | arch/arc/mm/init.c | 9 |
6 files changed, 37 insertions, 17 deletions
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 76668579b54..7db978570fb 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -249,10 +249,6 @@ source "arch/arc/plat-arcfpga/Kconfig" #New platform adds here -config ARC_PLAT_CLK - int "Clk speed in Hz" - default "80000000" - config LINUX_LINK_BASE hex "Linux Link Address" default "0x80000000" @@ -266,14 +262,6 @@ config LINUX_LINK_BASE Linux needs to be scooted a bit. If you don't know what the above means, leave this setting alone. -config ARC_PLAT_SDRAM_SIZE - hex "SD RAM Size" - default "0x10000000" - help - Implies the amount of SDRAM/DRAM Linux is going to claim/own. - The actual memory itself could be larger than this number. But for - all software purposes, this is the amt of memory. - endmenu # "Platform Board Configuration" config ARC_STACK_NONEXEC diff --git a/arch/arc/boot/dts/skeleton.dtsi b/arch/arc/boot/dts/skeleton.dtsi index 9b357d802a1..eb8b7736735 100644 --- a/arch/arc/boot/dts/skeleton.dtsi +++ b/arch/arc/boot/dts/skeleton.dtsi @@ -13,9 +13,13 @@ / { compatible = "snps,arc"; + clock-frequency = <80000000>; /* 80 MHZ */ #address-cells = <1>; #size-cells = <1>; chosen { }; aliases { }; - memory { device_type = "memory"; reg = <0 0>; }; + memory { + device_type = "memory"; + reg = <0x00000000 0x10000000>; /* 256M */ + }; }; diff --git a/arch/arc/include/asm/clk.h b/arch/arc/include/asm/clk.h index 61956436c75..bf9d29f5bd5 100644 --- a/arch/arc/include/asm/clk.h +++ b/arch/arc/include/asm/clk.h @@ -17,4 +17,6 @@ static inline unsigned long arc_get_core_freq(void) return core_freq; } +extern int arc_set_core_freq(unsigned long); + #endif diff --git a/arch/arc/kernel/clk.c b/arch/arc/kernel/clk.c index 64925db9eb5..66ce0dc917f 100644 --- a/arch/arc/kernel/clk.c +++ b/arch/arc/kernel/clk.c @@ -8,4 +8,14 @@ #include <asm/clk.h> -unsigned long core_freq = CONFIG_ARC_PLAT_CLK; +unsigned long core_freq = 800000000; + +/* + * As of now we default to device-tree provided clock + * In future we can determine this in early boot + */ +int arc_set_core_freq(unsigned long freq) +{ + core_freq = freq; + return 0; +} diff --git a/arch/arc/kernel/devtree.c b/arch/arc/kernel/devtree.c index 48e157efad1..c8166dc02c3 100644 --- a/arch/arc/kernel/devtree.c +++ b/arch/arc/kernel/devtree.c @@ -15,6 +15,7 @@ #include <linux/of.h> #include <linux/of_fdt.h> #include <asm/prom.h> +#include <asm/clk.h> /* called from unflatten_device_tree() to bootstrap devicetree itself */ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) @@ -34,7 +35,9 @@ int __init setup_machine_fdt(void *dt) struct boot_param_header *devtree = dt; unsigned long dt_root; char *model, *compat; + void *clk; char manufacturer[16]; + unsigned long len; /* check device tree validity */ if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) @@ -60,5 +63,15 @@ int __init setup_machine_fdt(void *dt) /* Retrieve various information from the /chosen node */ of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); + /* Initialize {size,address}-cells info */ + of_scan_flat_dt(early_init_dt_scan_root, NULL); + + /* Setup memory, calling early_init_dt_add_memory_arch */ + of_scan_flat_dt(early_init_dt_scan_memory, NULL); + + clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len); + if (clk) + arc_set_core_freq(of_read_ulong(clk, len/4)); + return 0; } diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c index 682cf574048..caf797de23f 100644 --- a/arch/arc/mm/init.c +++ b/arch/arc/mm/init.c @@ -25,7 +25,7 @@ char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE); EXPORT_SYMBOL(empty_zero_page); /* Default tot mem from .config */ -static unsigned long arc_mem_sz = CONFIG_ARC_PLAT_SDRAM_SIZE; +static unsigned long arc_mem_sz = 0x20000000; /* some default */ /* User can over-ride above with "mem=nnn[KkMm]" in cmdline */ static int __init setup_mem_sz(char *str) @@ -41,7 +41,8 @@ early_param("mem", setup_mem_sz); void __init early_init_dt_add_memory_arch(u64 base, u64 size) { - pr_err("%s(%llx, %llx)\n", __func__, base, size); + arc_mem_sz = size & PAGE_MASK; + pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz)); } /* @@ -62,7 +63,9 @@ void __init setup_arch_memory(void) /* * We do it here, so that memory is correctly instantiated - * even if "mem=xxx" cmline over-ride is not given + * even if "mem=xxx" cmline over-ride is given and/or + * DT has memory node. Each causes an update to @arc_mem_sz + * and we finally add memory one here */ memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz); |