===================================================================
@@ -1164,14 +1164,13 @@
dcl &= ~DCL_UnBuffDimm;
if (unbuffered) {
if ((has_dualch) && (!is_cpu_pre_d0())) {
- dcl |= DCL_UnBuffDimm; /* set DCL_DualDIMMen too? */
-
- /* set DCL_En2T if you have non-equal DDR mem types! */
-
+ dcl |= DCL_UnBuffDimm;
+#if defined(CONFIG_CPU_AMD_SOCKET_939)
if ((cpuid_eax(1) & 0x30) == 0x30) {
/* CS[7:4] is copy of CS[3:0], should be set for 939 socket */
dcl |= DCL_UpperCSMap;
}
+#endif
} else {
dcl |= DCL_UnBuffDimm;
}
@@ -1382,21 +1381,147 @@
const struct mem_param *param;
long dimm_mask;
};
+
+static const unsigned char min_cycle_times[] = {
+ [NBCAP_MEMCLK_200MHZ] = 0x50, /* 5ns */
+ [NBCAP_MEMCLK_166MHZ] = 0x60, /* 6ns */
+ [NBCAP_MEMCLK_133MHZ] = 0x75, /* 7.5ns */
+ [NBCAP_MEMCLK_100MHZ] = 0xa0, /* 10ns */
+};
+
+#if defined(CONFIG_CPU_AMD_SOCKET_939)
+
+/* return the minimum cycle time and set 2T accordingly */
+static unsigned int spd_dimm_loading_socket939(const struct mem_controller *ctrl, long dimm_mask) {
+
+/* + 1 raise so we detect 0 as bad field */
+#define DDR200 (NBCAP_MEMCLK_100MHZ + 1)
+#define DDR333 (NBCAP_MEMCLK_166MHZ + 1)
+#define DDR400 (NBCAP_MEMCLK_200MHZ + 1)
+#define DDR_2T 0x80
+#define DDR_MASK 0x3
+
+#define DDR200_2T (DDR_2T | DDR200)
+#define DDR333_2T (DDR_2T | DDR333)
+#define DDR400_2T (DDR_2T | DDR400)
+
+/*
+ Following table comes directly from BKDG (unbuffered DIMM support)
+ [Y][X] Y = ch0_0, ch1_0, ch0_1, ch1_1 1=present 0=empty
+ X uses same layout but 1 means double rank 0 is single rank/empty
+*/
+
+ static const unsigned char dimm_loading_config_preE[16][16] = {
+ [0x8] = {[0x0] = DDR400,[0x8] = DDR400},
+ [0x2] = {[0x0] = DDR333,[0x2] = DDR400},
+ [0xa] = {[0x0] = DDR400_2T,[0x2] = DDR400_2T,
+ [0x8] = DDR400_2T,[0xa] = DDR333_2T},
+ [0xc] = {[0x0] = DDR400,[0xc] = DDR400},
+ [0x3] = {[0x0] = DDR333,[0x3] = DDR400},
+ [0xf] = {[0x0] = DDR400_2T,[0x3] = DDR400_2T,
+ [0xc] = DDR400_2T,[0xf] = DDR333_2T},
+ };
+
+ static const unsigned char dimm_loading_config_revE[16][16] = {
+ [0x8] = {[0x0] = DDR400, [0x8] = DDR400},
+ [0x2] = {[0x0] = DDR333, [0x2] = DDR400},
+ [0x4] = {[0x0] = DDR400, [0x4] = DDR400},
+ [0x1] = {[0x0] = DDR333, [0x1] = DDR400},
+ [0xa] = {[0x0] = DDR400_2T, [0x2] = DDR400_2T,
+ [0x8] = DDR400_2T, [0xa] = DDR333_2T},
+ [0x5] = {[0x0] = DDR400_2T, [0x1] = DDR400_2T,
+ [0x4] = DDR400_2T, [0x5] = DDR333_2T},
+ [0xc] = {[0x0] = DDR400, [0xc] = DDR400, [0x4] = DDR400, [0x8] = DDR400},
+ [0x3] = {[0x0] = DDR333, [0x1] = DDR333, [0x2] = DDR333, [0x3] = DDR400},
+ [0xe] = {[0x0] = DDR400_2T, [0x4] = DDR400_2T, [0x2] = DDR400_2T,
+ [0x6] = DDR400_2T, [0x8] = DDR400_2T, [0xc] = DDR400_2T,
+ [0xa] = DDR333_2T, [0xe] = DDR333_2T},
+ [0xb] = {[0x0] = DDR333, [0x1] = DDR400_2T, [0x2] = DDR333_2T,
+ [0x3] = DDR400_2T, [0x8] = DDR333_2T, [0x9] = DDR400_2T,
+ [0xa] = DDR333_2T, [0xb] = DDR333_2T},
+ [0xd] = {[0x0] = DDR400_2T, [0x8] = DDR400_2T, [0x1] = DDR400_2T,
+ [0x9] = DDR333_2T, [0x4] = DDR400_2T, [0xc] = DDR400_2T,
+ [0x5] = DDR333_2T, [0xd] = DDR333_2T},
+ [0x7] = {[0x0] = DDR333_2T, [0x2] = DDR400_2T, [0x1] = DDR333_2T,
+ [0x3] = DDR400_2T, [0x4] = DDR333_2T, [0x6] = DDR400_2T,
+ [0x5] = DDR333_2T, [0x7] = DDR333_2T},
+ [0xf] = {[0x0] = DDR400_2T, [0x1] = DDR400_2T, [0x4] = DDR400_2T,
+ [0x5] = DDR333_2T, [0x2] = DDR400_2T, [0x3] = DDR400_2T,
+ [0x6] = DDR400_2T, [0x7] = DDR333_2T, [0x8] = DDR400_2T,
+ [0x9] = DDR400_2T, [0xc] = DDR400_2T, [0xd] = DDR333_2T,
+ [0xa] = DDR333_2T, [0xb] = DDR333_2T, [0xe] = DDR333_2T,
+ [0xf] = DDR333_2T},
+ };
+ /*The dpos matches channel positions defined in BKDG and above arrays
+ The rpos is bitmask of dual rank dimms in same order as dpos */
+ unsigned int dloading = 0, dloading_cycle_time, i, rpos = 0, dpos =0;
+ const unsigned char (*dimm_loading_config)[16] = dimm_loading_config_revE;
+ int rank;
+ uint32_t dcl;
+
+ if (is_cpu_pre_e0()) {
+ dimm_loading_config = dimm_loading_config_preE;
+ }
+
+ /* only DIMMS two per channel */
+ for (i = 0; i < 2; i++) {
+ if ((dimm_mask & (1 << i))) {
+ /* read rank channel 0 */
+ rank = spd_read_byte(ctrl->channel0[i], 5);
+ if (rank < 0) goto hw_error;
+ rpos |= (rank == 2) ? (1 << (3 - (i * 2))) : 0;
+ dpos |= (1 << (3 - (i * 2)));
+ }
+
+ if ((dimm_mask & (1 << (i+DIMM_SOCKETS)))) {
+ /* read rank channel 1*/
+ rank = spd_read_byte(ctrl->channel1[i], 5);
+ if (rank < 0) goto hw_error;
+ rpos |= (rank == 2) ? (1 << (2 - (i * 2))) : 0;
+ dpos |= (1 << (2 - (i * 2)));
+ }
+ }
+ /* now the lookup, decode the max speed DDR400_2T etc */
+ dloading = dimm_loading_config[dpos][rpos] & DDR_MASK;
+#if 0
+ printk(BIOS_DEBUG, "XXX %x %x dload %x 2T %x\n", dpos,rpos, dloading, dimm_loading_config[dpos][rpos] & DDR_2T);
+#endif
+hw_error:
+ if (dloading != 0) {
+ /* map it back to cycle load times */
+ dloading_cycle_time = min_cycle_times[dloading - 1];
+ /* we have valid combination check the restrictions */
+ dcl = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
+ dcl |= (dimm_loading_config[dpos][rpos] & DDR_2T) ? (DCL_En2T) : 0;
+ /* Set DuallDimm is second channel is completely empty (revD+) */
+ if (((cpuid_eax(1) & 0xfff0f) >= 0x10f00) && ((dpos & 0x5) == 0)) {
+ printk(BIOS_DEBUG, "Setting DualDIMMen\n");
+ dcl |= DCL_DualDIMMen;
+ }
+ pci_write_config32(ctrl->f2, DRAM_CONFIG_LOW, dcl);
+ } else {
+ /* if we don't find it we se it to DDR400 */
+ printk(BIOS_WARNING, "Detected strange DIMM configuration, may not work! (or bug)\n");
+ dloading_cycle_time = min_cycle_times[NBCAP_MEMCLK_200MHZ];
+ }
+
+ return dloading_cycle_time;
+}
+
+#endif /* #if defined(CONFIG_CPU_AMD_SOCKET_939) */
+
static struct spd_set_memclk_result spd_set_memclk(const struct mem_controller *ctrl, long dimm_mask)
{
/* Compute the minimum cycle time for these dimms */
struct spd_set_memclk_result result;
unsigned min_cycle_time, min_latency, bios_cycle_time;
+#if defined(CONFIG_CPU_AMD_SOCKET_939)
+ unsigned dloading_cycle_time;
+#endif
int i;
uint32_t value;
static const uint8_t latency_indicies[] = { 26, 23, 9 };
- static const unsigned char min_cycle_times[] = {
- [NBCAP_MEMCLK_200MHZ] = 0x50, /* 5ns */
- [NBCAP_MEMCLK_166MHZ] = 0x60, /* 6ns */
- [NBCAP_MEMCLK_133MHZ] = 0x75, /* 7.5ns */
- [NBCAP_MEMCLK_100MHZ] = 0xa0, /* 10ns */
- };
value = pci_read_config32(ctrl->f3, NORTHBRIDGE_CAP);
@@ -1545,6 +1670,16 @@
}
#endif
#endif
+
+#if defined(CONFIG_CPU_AMD_SOCKET_939)
+ dloading_cycle_time = spd_dimm_loading_socket939(ctrl, dimm_mask);
+ if (dloading_cycle_time > min_cycle_time) {
+ min_cycle_time = dloading_cycle_time;
+ printk(BIOS_WARNING, "Memory speed reduced due to signal loading conditions\n");
+ }
+#endif
+
+
/* Now that I know the minimum cycle time lookup the memory parameters */
result.param = get_mem_param(min_cycle_time);