diff options
Diffstat (limited to 'arch/arm/mach-sa1100')
| -rw-r--r-- | arch/arm/mach-sa1100/cpu-sa1110.c | 131 |
1 files changed, 76 insertions, 55 deletions
diff --git a/arch/arm/mach-sa1100/cpu-sa1110.c b/arch/arm/mach-sa1100/cpu-sa1110.c index 04c94ab6c18..63959772993 100644 --- a/arch/arm/mach-sa1100/cpu-sa1110.c +++ b/arch/arm/mach-sa1100/cpu-sa1110.c @@ -15,7 +15,10 @@ * SDRAM reads (rev A0, B0, B1) * * We ignore rev. A0 and B0 devices; I don't think they're worth supporting. + * + * The SDRAM type can be passed on the command line as cpu_sa1110.sdram=type */ +#include <linux/moduleparam.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> @@ -35,6 +38,7 @@ static struct cpufreq_driver sa1110_driver; struct sdram_params { + const char name[16]; u_char rows; /* bits */ u_char cas_latency; /* cycles */ u_char tck; /* clock cycle time (ns) */ @@ -50,54 +54,53 @@ struct sdram_info { u_int mdcas[3]; }; -static struct sdram_params tc59sm716_cl2_params __initdata = { - .rows = 12, - .tck = 10, - .trcd = 20, - .trp = 20, - .twr = 10, - .refresh = 64000, - .cas_latency = 2, -}; - -static struct sdram_params tc59sm716_cl3_params __initdata = { - .rows = 12, - .tck = 8, - .trcd = 20, - .trp = 20, - .twr = 8, - .refresh = 64000, - .cas_latency = 3, -}; - -static struct sdram_params samsung_k4s641632d_tc75 __initdata = { - .rows = 14, - .tck = 9, - .trcd = 27, - .trp = 20, - .twr = 9, - .refresh = 64000, - .cas_latency = 3, -}; - -static struct sdram_params samsung_km416s4030ct __initdata = { - .rows = 13, - .tck = 8, - .trcd = 24, /* 3 CLKs */ - .trp = 24, /* 3 CLKs */ - .twr = 16, /* Trdl: 2 CLKs */ - .refresh = 64000, - .cas_latency = 3, -}; - -static struct sdram_params wbond_w982516ah75l_cl3_params __initdata = { - .rows = 16, - .tck = 8, - .trcd = 20, - .trp = 20, - .twr = 8, - .refresh = 64000, - .cas_latency = 3, +static struct sdram_params sdram_tbl[] __initdata = { + { /* Toshiba TC59SM716 CL2 */ + .name = "TC59SM716-CL2", + .rows = 12, + .tck = 10, + .trcd = 20, + .trp = 20, + .twr = 10, + .refresh = 64000, + .cas_latency = 2, + }, { /* Toshiba TC59SM716 CL3 */ + .name = "TC59SM716-CL3", + .rows = 12, + .tck = 8, + .trcd = 20, + .trp = 20, + .twr = 8, + .refresh = 64000, + .cas_latency = 3, + }, { /* Samsung K4S641632D TC75 */ + .name = "K4S641632D", + .rows = 14, + .tck = 9, + .trcd = 27, + .trp = 20, + .twr = 9, + .refresh = 64000, + .cas_latency = 3, + }, { /* Samsung KM416S4030CT */ + .name = "KM416S4030CT", + .rows = 13, + .tck = 8, + .trcd = 24, /* 3 CLKs */ + .trp = 24, /* 3 CLKs */ + .twr = 16, /* Trdl: 2 CLKs */ + .refresh = 64000, + .cas_latency = 3, + }, { /* Winbond W982516AH75L CL3 */ + .name = "W982516AH75L", + .rows = 16, + .tck = 8, + .trcd = 20, + .trp = 20, + .twr = 8, + .refresh = 64000, + .cas_latency = 3, + }, }; static struct sdram_params sdram_params; @@ -336,19 +339,36 @@ static struct cpufreq_driver sa1110_driver = { .name = "sa1110", }; +static struct sdram_params *sa1110_find_sdram(const char *name) +{ + struct sdram_params *sdram; + + for (sdram = sdram_tbl; sdram < sdram_tbl + ARRAY_SIZE(sdram_tbl); sdram++) + if (strcmp(name, sdram->name) == 0) + return sdram; + + return NULL; +} + +static char sdram_name[16]; + static int __init sa1110_clk_init(void) { - struct sdram_params *sdram = NULL; + struct sdram_params *sdram; + const char *name = sdram_name; - if (machine_is_assabet()) - sdram = &tc59sm716_cl3_params; + if (!name[0]) { + if (machine_is_assabet()) + name = "TC59SM716-CL3"; - if (machine_is_pt_system3()) - sdram = &samsung_k4s641632d_tc75; + if (machine_is_pt_system3()) + name = "K4S641632D"; - if (machine_is_h3100()) - sdram = &samsung_km416s4030ct; + if (machine_is_h3100()) + name = "KM416S4030CT"; + } + sdram = sa1110_find_sdram(name); if (sdram) { printk(KERN_DEBUG "SDRAM: tck: %d trcd: %d trp: %d" " twr: %d refresh: %d cas_latency: %d\n", @@ -363,4 +383,5 @@ static int __init sa1110_clk_init(void) return 0; } +module_param_string(sdram, sdram_name, sizeof(sdram_name), 0); arch_initcall(sa1110_clk_init); |