From a2ba6cd6e65bf96059632ed2fe48a7a0f5aea472 Mon Sep 17 00:00:00 2001 From: Jayachandran C Date: Wed, 21 Aug 2013 19:31:29 +0530 Subject: MIPS: Netlogic: Read memory from DRAM BARs Read the memory from the Bridge DRAM BARs, if it is not passed in from the device tree. This will allow us to remove memory configuration from built in device trees. Signed-off-by: Jayachandran C Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5743/ Signed-off-by: Ralf Baechle --- arch/mips/netlogic/xlp/nlm_hal.c | 35 +++++++++++++++++++++++++++++++++++ arch/mips/netlogic/xlp/setup.c | 23 +++++++++++++++++++++++ 2 files changed, 58 insertions(+) (limited to 'arch/mips/netlogic/xlp') diff --git a/arch/mips/netlogic/xlp/nlm_hal.c b/arch/mips/netlogic/xlp/nlm_hal.c index 87560e4db35f..6f2c21008ddb 100644 --- a/arch/mips/netlogic/xlp/nlm_hal.c +++ b/arch/mips/netlogic/xlp/nlm_hal.c @@ -44,6 +44,7 @@ #include #include #include +#include #include #include @@ -142,3 +143,37 @@ unsigned int nlm_get_cpu_frequency(void) { return nlm_get_core_frequency(0, 0); } + +/* + * Fills upto 8 pairs of entries containing the DRAM map of a node + * if n < 0, get dram map for all nodes + */ +int xlp_get_dram_map(int n, uint64_t *dram_map) +{ + uint64_t bridgebase, base, lim; + uint32_t val; + int i, node, rv; + + /* Look only at mapping on Node 0, we don't handle crazy configs */ + bridgebase = nlm_get_bridge_regbase(0); + rv = 0; + for (i = 0; i < 8; i++) { + val = nlm_read_bridge_reg(bridgebase, + BRIDGE_DRAM_NODE_TRANSLN(i)); + node = (val >> 1) & 0x3; + if (n >= 0 && n != node) + continue; + val = nlm_read_bridge_reg(bridgebase, BRIDGE_DRAM_BAR(i)); + val = (val >> 12) & 0xfffff; + base = (uint64_t) val << 20; + val = nlm_read_bridge_reg(bridgebase, BRIDGE_DRAM_LIMIT(i)); + val = (val >> 12) & 0xfffff; + if (val == 0) /* BAR not used */ + continue; + lim = ((uint64_t)val + 1) << 20; + dram_map[rv] = base; + dram_map[rv + 1] = lim; + rv += 2; + } + return rv; +} diff --git a/arch/mips/netlogic/xlp/setup.c b/arch/mips/netlogic/xlp/setup.c index 7b638f7be491..7718368e4598 100644 --- a/arch/mips/netlogic/xlp/setup.c +++ b/arch/mips/netlogic/xlp/setup.c @@ -73,6 +73,23 @@ static void nlm_fixup_mem(void) } } +static void __init xlp_init_mem_from_bars(void) +{ + uint64_t map[16]; + int i, n; + + n = xlp_get_dram_map(-1, map); /* -1: info for all nodes */ + for (i = 0; i < n; i += 2) { + /* exclude 0x1000_0000-0x2000_0000, u-boot device */ + if (map[i] <= 0x10000000 && map[i+1] > 0x10000000) + map[i+1] = 0x10000000; + if (map[i] > 0x10000000 && map[i] < 0x20000000) + map[i] = 0x20000000; + + add_memory_region(map[i], map[i+1] - map[i], BOOT_MEM_RAM); + } +} + void __init plat_mem_setup(void) { panic_timeout = 5; @@ -82,6 +99,12 @@ void __init plat_mem_setup(void) /* memory and bootargs from DT */ early_init_devtree(initial_boot_params); + + if (boot_mem_map.nr_map == 0) { + pr_info("Using DRAM BARs for memory map.\n"); + xlp_init_mem_from_bars(); + } + /* Calculate and setup wired entries for mapped kernel */ nlm_fixup_mem(); } -- cgit v1.2.3