diff options
Diffstat (limited to 'target/linux/adm5120-2.6/files/arch')
| -rw-r--r-- | target/linux/adm5120-2.6/files/arch/mips/adm5120/adm5120_info.c | 159 |
1 files changed, 103 insertions, 56 deletions
diff --git a/target/linux/adm5120-2.6/files/arch/mips/adm5120/adm5120_info.c b/target/linux/adm5120-2.6/files/arch/mips/adm5120/adm5120_info.c index 6d512f1..c34dbd0 100644 --- a/target/linux/adm5120-2.6/files/arch/mips/adm5120/adm5120_info.c +++ b/target/linux/adm5120-2.6/files/arch/mips/adm5120/adm5120_info.c @@ -15,6 +15,7 @@ #include <linux/kernel.h> #include <linux/init.h> #include <linux/string.h> +#include <linux/module.h> #include <asm/bootinfo.h> #include <asm/addrspace.h> @@ -22,6 +23,7 @@ #include <asm/mach-adm5120/adm5120_defs.h> #include <asm/mach-adm5120/adm5120_switch.h> +#include <asm/mach-adm5120/adm5120_mpmc.h> #include <asm/mach-adm5120/adm5120_info.h> #include <asm/mach-adm5120/myloader.h> #include <asm/mach-adm5120/routerboot.h> @@ -32,6 +34,8 @@ extern char *prom_getenv(char *envname); * Globals */ struct adm5120_board adm5120_board; +EXPORT_SYMBOL_GPL(adm5120_board); + unsigned int adm5120_boot_loader; unsigned int adm5120_product_code; @@ -81,6 +85,7 @@ static struct adm5120_board __initdata adm5120_boards[] = { .mach_type = MACH_ADM5120_CAS771, .has_usb = 0, .iface_num = 5, + .mem_size = (32 << 20), .flash0_size = 4*1024*1024, }, { @@ -137,6 +142,7 @@ static struct adm5120_board __initdata adm5120_boards[] = { .mach_type = MACH_ADM5120_WP54AG, .has_usb = 0, .iface_num = 2, + .mem_size = (16 << 20), .flash0_size = 4*1024*1024, }, { @@ -179,6 +185,7 @@ static struct adm5120_board __initdata adm5120_boards[] = { .mach_type = MACH_ADM5120_BR6104K, .has_usb = 0, .iface_num = 5, + .mem_size = (16 << 20), .flash0_size = 2*1024*1024, }, { @@ -926,19 +933,76 @@ static void __init adm5120_detect_cpuinfo(void) adm5120_speed += 50000000; } -#if 1 -# define mem_dbg(f, ...) prom_printf("mem_detect: " f, ## __VA_ARGS__) +static void adm5120_ndelay(u32 ns) +{ + u32 t; + + SWITCH_WRITE(SWITCH_REG_TIMER, TIMER_PERIOD_DEFAULT); + SWITCH_WRITE(SWITCH_REG_TIMER_INT, (TIMER_INT_TOS | TIMER_INT_TOM)); + + t = (ns+640) / 640; + t &= TIMER_PERIOD_MASK; + SWITCH_WRITE(SWITCH_REG_TIMER, t | TIMER_TE); + + /* wait until the timer expires */ + do { + t = SWITCH_READ(SWITCH_REG_TIMER_INT); + } while ((t & TIMER_INT_TOS) == 0); + + /* leave the timer disabled */ + SWITCH_WRITE(SWITCH_REG_TIMER, TIMER_PERIOD_DEFAULT); + SWITCH_WRITE(SWITCH_REG_TIMER_INT, (TIMER_INT_TOS | TIMER_INT_TOM)); +} + +#define MPMC_READ(r) *(u32 *)(KSEG1ADDR(ADM5120_SWITCH_BASE)+(r)) +#define MPMC_WRITE(r,v) *(u32 *)(KSEG1ADDR(ADM5120_SWITCH_BASE)+(r))=(v) + extern void prom_printf(char *, ...); +#if 1 +# define mem_dbg(f, a...) prom_printf("mem_detect: " f, ## a) #else -# define mem_dbg(f, ...) +# define mem_dbg(f, a...) #endif +#define MEM_WR_DELAY 10000 /* 0.01 usec */ + +static int mem_check_pattern(u8 *addr, unsigned long offs) +{ + volatile u32 *p1 = (volatile u32 *)addr; + volatile u32 *p2 = (volatile u32 *)(addr+offs); + u32 t,u,v; + + /* save original value */ + t = *p1; + u = *p2; + + if (t != u) + return 0; + + v = 0x55555555; + if (u == v) + v = 0xAAAAAAAA; + + mem_dbg("write 0x%08lX to 0x%08lX\n", v, (unsigned long)p1); + + *p1 = v; + mem_dbg("delay %d ns\n", MEM_WR_DELAY); + adm5120_ndelay(MEM_WR_DELAY); + u = *p2; + + mem_dbg("pattern at 0x%08lX is 0x%08lX\n", (unsigned long)p2, u); + + /* restore original value */ + *p1 = t; + + return (v == u); +} + static void __init adm5120_detect_memsize(void) { u32 memctrl; u32 size, maxsize; - volatile u8 *p,*r; - u8 t; + u8 *p; memctrl = SWITCH_READ(SWITCH_REG_MEMCTRL); switch (memctrl & MEMCTRL_SDRS_MASK) { @@ -956,71 +1020,45 @@ static void __init adm5120_detect_memsize(void) break; } - /* FIXME: need to disable buffers for both SDRAM banks? */ + /* disable buffers for both SDRAM banks */ + mem_dbg("disable buffers for both banks\n"); + MPMC_WRITE(MPMC_REG_DC0, MPMC_READ(MPMC_REG_DC0) & ~DC_BE); + MPMC_WRITE(MPMC_REG_DC1, MPMC_READ(MPMC_REG_DC1) & ~DC_BE); - mem_dbg("checking for %ldMB chip\n",maxsize >> 20); + mem_dbg("checking for %ldMB chip in 1st bank\n", maxsize >> 20); /* detect size of the 1st SDRAM bank */ - p = (volatile u8 *)KSEG1ADDR(0); - t = *p; + p = (u8 *)KSEG1ADDR(0); for (size = 2<<20; size <= (maxsize >> 1); size <<= 1) { -#if 1 - r = (p+size); - *p = 0x55; - mem_dbg("1st pattern at 0x%lx is 0x%02x\n", size, *r); - if (*r == 0x55) { - *p = 0xAA; - mem_dbg("2nd pattern at 0x%lx is 0x%02x\n", size, *r); - if (*r == 0xAA) { - /* mirrored address */ - mem_dbg("mirrored data found at 0x%lx\n", size); - break; - } + if (mem_check_pattern(p, size)) { + /* mirrored address */ + mem_dbg("mirrored data found at offset 0x%lX\n", size); + break; } -#else - p[0] = 0x55; - mem_dbg("1st pattern at 0x%lx is 0x%02x\n", size, p[size]); - if (p[size] != 0x55) - continue; - - p[0] = 0xAA; - mem_dbg("2nd pattern at 0x%lx is 0x%02x\n", size, p[size]); - if (p[size] != 0xAA) - continue; - - /* mirrored address */ - mem_dbg("mirrored data found at 0x%lx\n", size); - break; -#endif } - *p = t; - mem_dbg("%ldMB chip found\n", size >> 20); + mem_dbg("chip size in 1st bank is %ldMB\n", size >> 20); + adm5120_memsize = size; - if (size == (32 << 20)) - /* if bank size is 32MB, 2nd bank is not supported */ + if (size != maxsize) + /* 2nd bank is not supported */ goto out; if ((memctrl & MEMCTRL_SDR1_ENABLE) == 0) - /* if 2nd bank is not enabled, we are done */ + /* 2nd bank is disabled */ goto out; /* * some bootloaders enable 2nd bank, even if the 2nd SDRAM chip * are missing. */ - mem_dbg("checking second bank\n"); - p += (maxsize+size)-1; - t = *p; - *p = 0x55; - if (*p != 0x55) - goto out; + mem_dbg("check presence of 2nd bank\n"); - *p = 0xAA; - if (*p != 0xAA) - goto out; + p = (u8 *)KSEG1ADDR(maxsize+size-4); + if (mem_check_pattern(p, 0)) { + adm5120_memsize += size; + } - *p = t; if (maxsize != size) { /* adjusting MECTRL register */ memctrl &= ~(MEMCTRL_SDRS_MASK); @@ -1040,11 +1078,21 @@ static void __init adm5120_detect_memsize(void) } SWITCH_WRITE(SWITCH_REG_MEMCTRL, memctrl); } - size <<= 1; out: - adm5120_memsize = size; - mem_dbg("%ldMB memory found\n",size>>20); + /* reenable buffer for both SDRAM banks */ + mem_dbg("enable buffers for both banks\n"); + MPMC_WRITE(MPMC_REG_DC0, MPMC_READ(MPMC_REG_DC0) | DC_BE); + MPMC_WRITE(MPMC_REG_DC1, MPMC_READ(MPMC_REG_DC1) | DC_BE); + + mem_dbg("%dx%ldMB memory found\n", (adm5120_memsize == size) ? 1 : 2 , + size >>20); + + size = adm5120_board_memsize(); + if (size > 0 && size != adm5120_memsize) { + mem_dbg("wrong memory size detected, board settings will be used\n"); + adm5120_memsize = size; + } } void __init adm5120_info_show(void) @@ -1063,10 +1111,9 @@ void __init adm5120_info_show(void) void __init adm5120_info_init(void) { - adm5120_detect_cpuinfo(); - adm5120_detect_memsize(); adm5120_detect_board(); + adm5120_detect_memsize(); adm5120_info_show(); } |