[ARM] Fix sa11x0 SDRAM selection

Avoid folk having to edit cpu-sa1110.c to select their RAM type;
instead, allow the SDRAM type to be selected via the kernel
command line.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mach-sa1100/cpu-sa1110.c b/arch/arm/mach-sa1100/cpu-sa1110.c
index 04c94ab6c18b19f7eac1ffc47a5e11bfe11bed38..639597729932e5ce821569f03fcd19184b4515fc 100644 (file)
--- 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);