Following patch adds support to bring out the memory out of self refresh when doing...

Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
The patch is based on my 2008 patch.
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6172 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

diff --git a/src/northbridge/amd/amdk8/raminit.c b/src/northbridge/amd/amdk8/raminit.c
index 9e0ebfb2cdffd4adc594dbe94b2448341927b333..563064b13f667229130c81fabb9e4cc1b793805c 100644 (file)
--- a/src/northbridge/amd/amdk8/raminit.c
+++ b/src/northbridge/amd/amdk8/raminit.c
@@ -2226,6 +2226,12 @@ static void sdram_enable(int controllers, const struct mem_controller *ctrl)
 #endif
 {
        int i;
+       u32 whatWait = 0;
+#if CONFIG_HAVE_ACPI_RESUME == 1
+       int suspend = acpi_is_wakeup_early();
+#else
+       int suspend = 0;
+#endif
 
        /* Error if I don't have memory */
        if (memory_end_k(ctrl, controllers) == 0) {
@@ -2277,13 +2283,31 @@ static void sdram_enable(int controllers, const struct mem_controller *ctrl)
                        }
                        pci_write_config32(ctrl[i].f3, MCA_NB_CONFIG, mnc);
                }
-               dcl |= DCL_DisDqsHys;
-               pci_write_config32(ctrl[i].f2, DRAM_CONFIG_LOW, dcl);
+
+               if (!suspend) {
+                       dcl |= DCL_DisDqsHys;
+                       pci_write_config32(ctrl[i].f2, DRAM_CONFIG_LOW, dcl);
+               }
                dcl &= ~DCL_DisDqsHys;
                dcl &= ~DCL_DLL_Disable;
                dcl &= ~DCL_D_DRV;
                dcl &= ~DCL_QFC_EN;
-               dcl |= DCL_DramInit;
+
+               if (suspend) {
+                       enable_lapic();
+                       init_timer();
+                       dcl |= (DCL_ESR | DCL_SRS);
+                       /* Handle errata 85 Insufficient Delay Between MEMCLK Startup
+                          and CKE Assertion During Resume From S3 */
+                       udelay(10); /* for unregistered */
+                       if (is_registered(&ctrl[i])) {
+                               udelay(100); /* 110us for registered (we wait 10us already) */
+                       }
+                       whatWait = DCL_ESR;
+               } else {
+                       dcl |= DCL_DramInit;
+                       whatWait = DCL_DramInit;
+               }
                pci_write_config32(ctrl[i].f2, DRAM_CONFIG_LOW, dcl);
        }
 
@@ -2305,7 +2329,7 @@ static void sdram_enable(int controllers, const struct mem_controller *ctrl)
                        if ((loops & 1023) == 0) {
                                printk(BIOS_DEBUG, ".");
                        }
-               } while(((dcl & DCL_DramInit) != 0) && (loops < TIMEOUT_LOOPS));
+               } while(((dcl & whatWait) != 0) && (loops < TIMEOUT_LOOPS));
                if (loops >= TIMEOUT_LOOPS) {
                        printk(BIOS_DEBUG, " failed\n");
                        continue;
@@ -2313,11 +2337,15 @@ static void sdram_enable(int controllers, const struct mem_controller *ctrl)
 
                if (!is_cpu_pre_c0()) {
                        /* Wait until it is safe to touch memory */
+#if 0
+                       /* the registers are marked read-only but code zeros them */
                        dcl &= ~(DCL_MemClrStatus | DCL_DramEnable);
                        pci_write_config32(ctrl[i].f2, DRAM_CONFIG_LOW, dcl);
+#endif
                        do {
                                dcl = pci_read_config32(ctrl[i].f2, DRAM_CONFIG_LOW);
-                       } while(((dcl & DCL_MemClrStatus) == 0) || ((dcl & DCL_DramEnable) == 0) );
+                       } while(((dcl & DCL_MemClrStatus) == 0) || ((dcl & DCL_DramEnable) == 0) ||
+                                       ((dcl & DCL_SRS)));
                }
 
                printk(BIOS_DEBUG, " done\n");