summaryrefslogtreecommitdiff
path: root/src/cpu/amd/sc520
diff options
context:
space:
mode:
authorarch import user (historical) <svn@openbios.org>2005-07-06 17:03:03 +0000
committerarch import user (historical) <svn@openbios.org>2005-07-06 17:03:03 +0000
commit0b78ea7a28b4c6c703a10138cc3b6596854fff6f (patch)
tree0850b021b968d4f1c4a4ea4db260777bd973f58c /src/cpu/amd/sc520
parent4a39e0b67ce13f63ebf23282f7b8f1ae1e803d01 (diff)
downloadcoreboot-0b78ea7a28b4c6c703a10138cc3b6596854fff6f.tar.xz
Revision: linuxbios@linuxbios.org--devel/freebios--devel--2.0--patch-23
Creator: Ronald G. Minnich <rminnich@lanl.gov> add in stepan's raminit code for the sc520 git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1939 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/cpu/amd/sc520')
-rw-r--r--src/cpu/amd/sc520/raminit.c219
1 files changed, 219 insertions, 0 deletions
diff --git a/src/cpu/amd/sc520/raminit.c b/src/cpu/amd/sc520/raminit.c
index 8b13789179..b7bf629348 100644
--- a/src/cpu/amd/sc520/raminit.c
+++ b/src/cpu/amd/sc520/raminit.c
@@ -1 +1,220 @@
+/*
+ *
+ *
+ */
+
+#define DRCCTL *(char*)0x0fffef010 // DRAM control register
+#define DRCTMCTL *(char*)0x0fffef012 // DRAM timing control register
+#define DRCCFG *(char*)0x0fffef014 // DRAM bank configuration register
+#define DRCBENDADR *(char*)0x0fffef018 // DRAM bank ending address register
+#define ECCCTL *(char*)0x0fffef020 // DRAM ECC control register
+#define DBCTL *(char*)0x0fffef040 // DRAM buffer control register
+
+#define CACHELINESZ 0x00000010 // size of our cache line (read buffer)
+
+#define COL11_ADR *(unsigned int *)0x0e001e00 // 11 col addrs
+#define COL10_ADR *(unsigned int *)0x0e000e00 // 10 col addrs
+#define COL09_ADR *(unsigned int *)0x0e000600 // 9 col addrs
+#define COL08_ADR *(unsigned int *)0x0e000200 // 8 col addrs
+
+#define ROW14_ADR *(unsigned int *)0x0f000000 // 14 row addrs
+#define ROW13_ADR *(unsigned int *)0x07000000 // 13 row addrs
+#define ROW12_ADR *(unsigned int *)0x03000000 // 12 row addrs
+#define ROW11_ADR *(unsigned int *)0x01000000 // 11 row addrs/also bank switch
+#define ROW10_ADR *(unsigned int *)0x00000000 // 10 row addrs/also bank switch
+
+#define COL11_DATA 0x0b0b0b0b // 11 col addrs
+#define COL10_DATA 0x0a0a0a0a // 10 col data
+#define COL09_DATA 0x09090909 // 9 col data
+#define COL08_DATA 0x08080808 // 8 col data
+#define ROW14_DATA 0x3f3f3f3f // 14 row data (MASK)
+#define ROW13_DATA 0x1f1f1f1f // 13 row data (MASK)
+#define ROW12_DATA 0x0f0f0f0f // 12 row data (MASK)
+#define ROW11_DATA 0x07070707 // 11 row data/also bank switch (MASK)
+#define ROW10_DATA 0xaaaaaaaa // 10 row data/also bank switch (MASK)
+
+#define dummy_write() *(short *)CACHELINESZ=0x1010
+
+int nextbank(int bank)
+{
+ int rows,banks;
+
+start:
+ /* write col 11 wrap adr */
+ COL11_ADR=COL11_DATA;
+ if(COL11_ADR!=COL11_DATA)
+ goto bad_ram;
+
+ /* write col 10 wrap adr */
+ COL10_ADR=COL10_DATA;
+ if(COL10_ADR!=COL10_DATA)
+ goto bad_ram;
+
+ /* write col 9 wrap adr */
+ COL9_ADR=COL9_DATA;
+ if(COL9_ADR!=COL9_DATA)
+ goto bad_ram;
+
+ /* write col 8 wrap adr */
+ COL8_ADR=COL8_DATA;
+ if(COL8_ADR!=COL8_DATA)
+ goto bad_ram;
+
+ /* write row 14 wrap adr */
+ ROW14_ADR=ROW14_DATA;
+ if(ROW14_ADR!=ROW14_DATA)
+ goto bad_ram;
+
+ /* write row 13 wrap adr */
+ ROW13_ADR=ROW13_DATA;
+ if(ROW13_ADR!=ROW13_DATA)
+ goto bad_ram;
+
+ /* write row 12 wrap adr */
+ ROW12_ADR=ROW12_DATA;
+ if(ROW12_ADR!=ROW12_DATA)
+ goto bad_ram;
+
+ /* write row 11 wrap adr */
+ ROW11_ADR=ROW11_DATA;
+ if(ROW11_ADR!=ROW11_DATA)
+ goto bad_ram;
+
+ /* write row 10 wrap adr */
+ ROW10_ADR=ROW10_DATA;
+ if(ROW10_ADR!=ROW10_DATA)
+ goto bad_ram;
+
+/*
+ * read data @ row 12 wrap adr to determine # banks,
+ * and read data @ row 14 wrap adr to determine # rows.
+ * if data @ row 12 wrap adr is not AA, 11 or 12 we have bad RAM.
+ * if data @ row 12 wrap == AA, we only have 2 banks, NOT 4
+ * if data @ row 12 wrap == 11 or 12, we have 4 banks
+ */
+
+ banks=2;
+ if (ROW12_ADDR != ROW10_DATA) {
+ banks=4;
+ if(ROW12_ADDR != ROW11_DATA) {
+ if(ROW12_ADDR != ROW12_DATA)
+ goto bad_ram;
+ }
+ }
+
+ /* validate row mask */
+ i=ROW14_ADDR;
+ if (i<ROW11_DATA)
+ goto bad_ram;
+ if (i>ROW14_DATA)
+ goto bad_ram;
+ /* verify all 4 bytes of dword same */
+ if(i&0xffff!=(i>>16)&0xffff)
+ goto bad_ram;
+ if(i&0xff!=(i>>8)&0xff)
+ goto bad_ram;
+
+
+ /* validate column data */
+ i=COL11_ADDR;
+ if(i<COL8_DATA)
+ goto bad_ram;
+ if (i>COL11_DATA)
+ goto bad_ram;
+ /* verify all 4 bytes of dword same */
+ if(i&0xffff!=(i>>16)&0xffff)
+ goto bad_ram;
+ if(i&0xff!=(i>>8)&0xff)
+ goto bad_ram;
+
+ if(banks==4)
+ i+=8; /* <-- i holds merged value */
+
+ /* fix ending addr mask*/
+ /*FIXME*/
+ ending_adr=0xff;
+
+bad_reint:
+ /* issue all banks recharge */
+ DRCCTL=0x02;
+ dummy_write();
+
+ /* update ending address register */
+ *(DRCBENDADR+xxxx)=ending_adr;
+
+ /* update config register */
+ DRCCFG=DRCCFG&YYY|ZZZZ;
+
+ if(bank!=0) {
+ bank--;
+ *(&DRCBENDADR+XXYYXX)=0xff;
+ goto start;
+ }
+
+ /* set control register to NORMAL mode */
+ DRCCTL=0x00;
+ dummy_write();
+ return bank;
+
+bad_ram:
+ printk_error("bad ram!\r\n");
+}
+
+/* cache is assumed to be disabled */
+int sizemem(void)
+{
+ int i;
+ /* initialize dram controller registers */
+
+ DBCTL=0; /* disable write buffer/read-ahead buffer */
+ ECCCTL=0; /* disable ECC */
+ DRCTMCTL=0x1e; /* Set SDRAM timing for slowest speed. */
+
+ /* setup loop to do 4 external banks starting with bank 3 */
+
+ /* enable last bank and setup ending address
+ * register for max ram in last bank
+ */
+ DRCBENDADR=0x0ff000000;
+ /* setup dram register for all banks
+ * with max cols and max banks
+ */
+ DRCCFG=0xbbbb;
+
+ /* issue a NOP to all DRAMs */
+
+ /* Asetup DRAM control register with Disable refresh,
+ * disable write buffer Test Mode and NOP command select
+ */
+ DRCCTL=0x01;
+
+ /* dummy write for NOP to take effect */
+ dummy_write();
+
+ /* 100? 200? */
+ udelay(100);
+
+ /* issue all banks precharge */
+ DRCCTL=0x02;
+ dummy_write();
+
+ /* issue 2 auto refreshes to all banks */
+ DRCCTL=0x04;
+ dummy_write();
+ dummy_write();
+
+ /* issue LOAD MODE REGISTER command */
+ DRCCTL=0x03;
+ dummy_write();
+
+ DRCCTL=0x04;
+ for (i=0; i<8; i++) /* refresh 8 times */
+ dummy_write();
+
+ /* set control register to NORMAL mode */
+ DRCCTL=0x00;
+
+ nextbank(3);
+
+}