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-rw-r--r--cpu/ppc4xx/spd_sdram.c93
1 files changed, 45 insertions, 48 deletions
diff --git a/cpu/ppc4xx/spd_sdram.c b/cpu/ppc4xx/spd_sdram.c
index fc0c980..bf5d224 100644
--- a/cpu/ppc4xx/spd_sdram.c
+++ b/cpu/ppc4xx/spd_sdram.c
@@ -4,8 +4,8 @@
*
* Based on code by:
*
- * Kenneth Johansson ,Ericsson Business Innovation.
- * kenneth.johansson@inn.ericsson.se
+ * Kenneth Johansson ,Ericsson AB.
+ * kenneth.johansson@etx.ericsson.se
*
* hacked up by bill hunter. fixed so we could run before
* serial_init and console_init. previous version avoided this by
@@ -87,25 +87,16 @@
#define SDRAM0_BXCR_SZ(x) ( (( x << SDRAM0_BXCR_SZ_SHIFT) & SDRAM0_BXCR_SZ_MASK) )
#define SDRAM0_BXCR_AM(x) ( (( x << SDRAM0_BXCR_AM_SHIFT) & SDRAM0_BXCR_AM_MASK) )
-#ifdef CONFIG_W7O
+#ifdef CONFIG_SPDDRAM_SILENT
# define SPD_ERR(x) do { return 0; } while (0)
#else
-# define SPD_ERR(x) do { printf(x); hang(); } while (0)
+# define SPD_ERR(x) do { printf(x); return(0); } while (0)
#endif
-/*
- * what we really want is
- * (1/hertz) but we don't want to use floats so multiply with 10E9
- *
- * The error needs to be on the safe side so we want the floor function.
- * This means we get an exact value or we calculate that our bus frequency is
- * a bit faster than it really is and thus we don't progam the sdram controller
- * to run to fast
- */
#define sdram_HZ_to_ns(hertz) (1000000000/(hertz))
/* function prototypes */
-int spd_read(uint addr); /* prototype */
+int spd_read(uint addr);
/*
@@ -114,17 +105,17 @@ int spd_read(uint addr); /* prototype */
*
* This works on boards that has the same schematics that the IBM walnut has.
*
- * BUG: Don't handle ECC memory
- * BUG: A few values in the TR register is currently hardcoded
+ * Input: null for default I2C spd functions or a pointer to a custom function
+ * returning spd_data.
*/
-long int spd_sdram(void)
+long int spd_sdram(int(read_spd)(uint addr))
{
int bus_period,tmp,row,col;
int total_size,bank_size,bank_code;
int ecc_on;
- int mode = 4;
- int bank_cnt = 1;
+ int mode;
+ int bank_cnt;
int sdram0_pmit=0x07c00000;
int sdram0_besr0=-1;
@@ -144,14 +135,19 @@ long int spd_sdram(void)
int t_rp;
int t_rcd;
- int t_rc = 70; /* This value not available in SPD_EEPROM */
- int min_cas = 2;
+ int t_ras;
+ int t_rc;
+ int min_cas;
+ if(read_spd == 0){
+ read_spd=spd_read;
/*
* Make sure I2C controller is initialized
* before continuing.
*/
- i2c_init(CFG_I2C_SPEED, CFG_I2C_SLAVE);
+ i2c_init(CFG_I2C_SPEED, CFG_I2C_SLAVE);
+ }
+
/*
* Calculate the bus period, we do it this
@@ -162,7 +158,7 @@ long int spd_sdram(void)
bus_period = sdram_HZ_to_ns(tmp); /* get sdram speed */
/* Make shure we are using SDRAM */
- if (spd_read(2) != 0x04){
+ if (read_spd(2) != 0x04){
SPD_ERR("SDRAM - non SDRAM memory module found\n");
}
@@ -180,34 +176,35 @@ long int spd_sdram(void)
* use the min supported mode
*/
- tmp = spd_read(127) & 0x6;
+ tmp = read_spd(127) & 0x6;
if(tmp == 0x02){ /* only cas = 2 supported */
min_cas = 2;
-/* t_ck = spd_read(9); */
-/* t_ac = spd_read(10); */
+/* t_ck = read_spd(9); */
+/* t_ac = read_spd(10); */
}
else if (tmp == 0x04){ /* only cas = 3 supported */
min_cas = 3;
-/* t_ck = spd_read(9); */
-/* t_ac = spd_read(10); */
+/* t_ck = read_spd(9); */
+/* t_ac = read_spd(10); */
}
else if (tmp == 0x06){ /* 2,3 supported, so use 2 */
min_cas = 2;
-/* t_ck = spd_read(23); */
-/* t_ac = spd_read(24); */
+/* t_ck = read_spd(23); */
+/* t_ac = read_spd(24); */
}
else {
SPD_ERR("SDRAM - unsupported CAS latency \n");
}
- /* get some timing values, t_rp,t_rcd
+ /* get some timing values, t_rp,t_rcd,t_ras,t_rc
*/
- t_rp = spd_read(27);
- t_rcd = spd_read(29);
-
+ t_rp = read_spd(27);
+ t_rcd = read_spd(29);
+ t_ras = read_spd(30);
+ t_rc = t_ras + t_rp;
/* The following timing calcs subtract 1 before deviding.
- * this has effect of using ceiling intead of floor rounding,
+ * this has effect of using ceiling instead of floor rounding,
* and also subtracting 1 to convert number to reg value
*/
/* set up CASL */
@@ -216,12 +213,12 @@ long int spd_sdram(void)
sdram0_tr |= (((t_rp - 1)/bus_period) & 0x3) << SDRAM0_TR_PTA_SHIFT;
/* set up CTP */
tmp = ((t_rc - t_rcd - t_rp -1) / bus_period) & 0x3;
- if(tmp<1) SPD_ERR("SDRAM - unsupported prech to act time (Trp)\n");
+ if(tmp<1) tmp=1;
sdram0_tr |= tmp << SDRAM0_TR_CTP_SHIFT;
/* set LDF = 2 cycles, reg value = 1 */
sdram0_tr |= 1 << SDRAM0_TR_LDF_SHIFT;
/* set RFTA = t_rfc/bus_period, use t_rfc = t_rc */
- tmp = ((t_rc - 1) / bus_period)-4;
+ tmp = ( (t_rc - 1) / bus_period)-3;
if(tmp<0)tmp=0;
if(tmp>6)tmp=6;
sdram0_tr |= tmp << SDRAM0_TR_RFTA_SHIFT;
@@ -232,9 +229,9 @@ long int spd_sdram(void)
/*------------------------------------------------------------------
configure RTR register
-------------------------------------------------------------------*/
- row = spd_read(3);
- col = spd_read(4);
- tmp = spd_read(12) & 0x7f ; /* refresh type less self refresh bit */
+ row = read_spd(3);
+ col = read_spd(4);
+ tmp = read_spd(12) & 0x7f ; /* refresh type less self refresh bit */
switch(tmp){
case 0x00:
tmp=15625;
@@ -265,9 +262,9 @@ long int spd_sdram(void)
determine the number of banks used
-------------------------------------------------------------------*/
/* byte 7:6 is module data width */
- if(spd_read(7) != 0)
+ if(read_spd(7) != 0)
SPD_ERR("SDRAM - unsupported module width\n");
- tmp = spd_read(6);
+ tmp = read_spd(6);
if (tmp < 32)
SPD_ERR("SDRAM - unsupported module width\n");
else if (tmp < 64)
@@ -280,7 +277,7 @@ long int spd_sdram(void)
SPD_ERR("SDRAM - unsupported module width\n");
/* byte 5 is the module row count (refered to as dimm "sides") */
- tmp = spd_read(5);
+ tmp = read_spd(5);
if(tmp==1);
else if(tmp==2) bank_cnt *=2;
else if(tmp==4) bank_cnt *=4;
@@ -292,7 +289,7 @@ long int spd_sdram(void)
/* now check for ECC ability of module. We only support ECC
* on 32 bit wide devices with 8 bit ECC.
*/
- if ( (spd_read(11)==2) && ((spd_read(6)==40) || (spd_read(14)==8)) ){
+ if ( (read_spd(11)==2) && ((read_spd(6)==40) || (read_spd(14)==8)) ){
sdram0_ecccfg=0xf<<SDRAM0_ECCCFG_SHIFT;
ecc_on = 1;
}
@@ -305,15 +302,15 @@ long int spd_sdram(void)
calculate total size
-------------------------------------------------------------------*/
/* calculate total size and do sanity check */
- tmp = spd_read(31);
+ tmp = read_spd(31);
total_size=1<<22; /* total_size = 4MB */
- /* now multiply 4M by the smallest device roe density */
+ /* now multiply 4M by the smallest device row density */
/* note that we don't support asymetric rows */
while (((tmp & 0x0001) == 0) && (tmp != 0)){
total_size= total_size<<1;
tmp = tmp>>1;
}
- total_size *= spd_read(5); /* mult by module rows (dimm sides) */
+ total_size *= read_spd(5); /* mult by module rows (dimm sides) */
/*------------------------------------------------------------------
map rows * cols * banks to a mode
@@ -357,7 +354,7 @@ long int spd_sdram(void)
break;
case 9:
case 10:
- if (spd_read(17) ==2 )
+ if (read_spd(17) ==2 )
mode=6; /* mode 7 */
else
mode=2; /* mode 3 */
generated by cgit v1.1 at 2024-11-16 00:46:18 +0000