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-rw-r--r--src/northbridge/intel/x4x/dq_dqs.c378
-rw-r--r--src/northbridge/intel/x4x/raminit_ddr23.c39
-rw-r--r--src/northbridge/intel/x4x/x4x.h2
3 files changed, 417 insertions, 2 deletions
diff --git a/src/northbridge/intel/x4x/dq_dqs.c b/src/northbridge/intel/x4x/dq_dqs.c
index 5de8837a1e..8704d394a3 100644
--- a/src/northbridge/intel/x4x/dq_dqs.c
+++ b/src/northbridge/intel/x4x/dq_dqs.c
@@ -16,6 +16,7 @@
#include <arch/io.h>
#include <console/console.h>
+#include <delay.h>
#include <stdint.h>
#include <string.h>
#include <types.h>
@@ -116,6 +117,34 @@ static int increment_dq_dqs(const struct sysinfo *s,
return CB_SUCCESS;
}
+static int decrement_dq_dqs(const struct sysinfo *s,
+ struct dll_setting *dq_dqs_setting)
+{
+ u8 max_tap_val = max_tap[s->selected_timings.mem_clk
+ - MEM_CLOCK_800MHz];
+
+ if (dq_dqs_setting->pi > 0) {
+ dq_dqs_setting->pi -= 1;
+ } else if (dq_dqs_setting->tap > 0) {
+ dq_dqs_setting->pi = 6;
+ dq_dqs_setting->tap -= 1;
+ } else if (dq_dqs_setting->clk_delay > 0) {
+ dq_dqs_setting->pi = 6;
+ dq_dqs_setting->tap = max_tap_val;
+ dq_dqs_setting->clk_delay -= 1;
+ } else if (dq_dqs_setting->coarse > 0) {
+ dq_dqs_setting->pi = 6;
+ dq_dqs_setting->tap = max_tap_val;
+ dq_dqs_setting->clk_delay += 1;
+ dq_dqs_setting->coarse -= 1;
+ } else {
+ return CB_ERR;
+ }
+ set_db(s, dq_dqs_setting);
+ return CB_SUCCESS;
+}
+
+
#define WT_PATTERN_SIZE 80
static const u32 write_training_schedule[WT_PATTERN_SIZE] = {
@@ -501,3 +530,352 @@ int do_read_training(struct sysinfo *s)
printk(BIOS_DEBUG, "Done DQS read training\n");
return CB_SUCCESS;
}
+
+/* Enable write leveling on selected rank and disable output on other ranks */
+static void set_rank_write_level(struct sysinfo *s, u8 channel, u8 config,
+ u8 config_rank, u8 target_rank, int wl_enable)
+{
+ u32 emrs1;
+
+ /* Is shifted by bits 2 later so u8 can be used to reduce size */
+ const static u8 emrs1_lut[8][4][4]={ /* [Config][Leveling Rank][Rank] */
+ { /* Config 0: 2R2R */
+ {0x11, 0x00, 0x91, 0x00},
+ {0x00, 0x11, 0x91, 0x00},
+ {0x91, 0x00, 0x11, 0x00},
+ {0x91, 0x00, 0x00, 0x11}
+ },
+ { // Config 1: 2R1R
+ {0x11, 0x00, 0x91, 0x00},
+ {0x00, 0x11, 0x91, 0x00},
+ {0x91, 0x00, 0x11, 0x00},
+ {0x00, 0x00, 0x00, 0x00}
+ },
+ { // Config 2: 1R2R
+ {0x11, 0x00, 0x91, 0x00},
+ {0x00, 0x00, 0x00, 0x00},
+ {0x91, 0x00, 0x11, 0x00},
+ {0x91, 0x00, 0x00, 0x11}
+ },
+ { // Config 3: 1R1R
+ {0x11, 0x00, 0x91, 0x00},
+ {0x00, 0x00, 0x00, 0x00},
+ {0x91, 0x00, 0x11, 0x00},
+ {0x00, 0x00, 0x00, 0x00}
+ },
+ { // Config 4: 2R0R
+ {0x11, 0x00, 0x00, 0x00},
+ {0x00, 0x11, 0x00, 0x00},
+ {0x00, 0x00, 0x00, 0x00},
+ {0x00, 0x00, 0x00, 0x00}
+ },
+ { // Config 5: 0R2R
+ {0x00, 0x00, 0x00, 0x00},
+ {0x00, 0x00, 0x00, 0x00},
+ {0x00, 0x00, 0x11, 0x00},
+ {0x00, 0x00, 0x00, 0x11}
+ },
+ { // Config 6: 1R0R
+ {0x11, 0x00, 0x00, 0x00},
+ {0x00, 0x00, 0x00, 0x00},
+ {0x00, 0x00, 0x00, 0x00},
+ {0x00, 0x00, 0x00, 0x00}
+ },
+ { // Config 7: 0R1R
+ {0x00, 0x00, 0x00, 0x00},
+ {0x00, 0x00, 0x00, 0x00},
+ {0x00, 0x00, 0x11, 0x00},
+ {0x00, 0x00, 0x00, 0x00}
+ }
+ };
+
+ if (wl_enable) {
+ printk(RAM_DEBUG, "Entering WL mode\n");
+ printk(RAM_DEBUG, "Using WL ODT values\n");
+ emrs1 = emrs1_lut[config][target_rank][config_rank];
+ } else {
+ printk(RAM_DEBUG, "Exiting WL mode\n");
+ emrs1 = ddr3_emrs1_rtt_nom_config[s->dimm_config[channel]][config_rank];
+ }
+ printk(RAM_DEBUG, "Setting ODT for rank%d to ", config_rank);
+ switch (emrs1) {
+ case 0:
+ printk(RAM_DEBUG, "High-Z\n");
+ break;
+ case 0x11:
+ printk(RAM_DEBUG, "40 Ohm\n");
+ break;
+ case 0x81:
+ printk(RAM_DEBUG, "30 Ohm\n");
+ break;
+ case 0x80:
+ printk(RAM_DEBUG, "20 Ohm\n");
+ break;
+ case 0x10:
+ printk(RAM_DEBUG, "120 Ohm\n");
+ break;
+ case 0x01:
+ printk(RAM_DEBUG, "60 Ohm\n");
+ break;
+ default:
+ printk(BIOS_WARNING, "ODT value Undefined!\n");
+ break;
+ }
+
+ emrs1 <<= 2;
+ /* Set output drive strength to 34 Ohm during write levelling */
+ emrs1 |= (1 << 1);
+
+ if (wl_enable && (target_rank != config_rank)) {
+ printk(RAM_DEBUG, "Disabling output for rank%d\n", config_rank);
+ emrs1 |= (1 << 12);
+ }
+ if (wl_enable && (target_rank == config_rank)) {
+ printk(RAM_DEBUG, "Enabling WL for rank%d\n", config_rank);
+ emrs1 |= (1 << 7);
+ }
+ send_jedec_cmd(s, config_rank, channel, EMRS1_CMD, emrs1);
+}
+
+#define N_SAMPLES 5
+
+static void sample_dq(const struct sysinfo *s, u8 channel, u8 rank,
+ u8 high_found[8]) {
+ u32 address = test_address(channel, rank);
+ int samples, lane;
+
+ memset(high_found, 0, TOTAL_BYTELANES * sizeof(high_found[0]));
+ for (samples = 0; samples < N_SAMPLES; samples++) {
+ write32((u32 *)address, 0x12341234);
+ write32((u32 *)address + 4, 0x12341234);
+ udelay(5);
+ FOR_EACH_BYTELANE(lane) {
+ u8 dq_high = (MCHBAR8(0x561 + 0x400 * channel
+ + (lane * 4)) >> 7) & 1;
+ high_found[lane] += dq_high;
+ }
+ }
+}
+
+static enum cb_err increment_to_dqs_edge(struct sysinfo *s, u8 channel, u8 rank)
+{
+ int lane;
+ u8 saved_24d;
+ struct dll_setting dqs_setting[TOTAL_BYTELANES];
+ u8 bytelane_ok = 0;
+ u8 dq_sample[TOTAL_BYTELANES];
+
+ memcpy(dqs_setting, s->dqs_settings[channel], sizeof(dqs_setting));
+ FOR_EACH_BYTELANE(lane)
+ dqsset(channel, lane, &dqs_setting[lane]);
+
+ saved_24d = MCHBAR8(0x24d + 0x400 * channel);
+
+ /* Loop 0: Find DQ sample low, by decreasing */
+ while (bytelane_ok != 0xff) {
+ sample_dq(s, channel, rank, dq_sample);
+ FOR_EACH_BYTELANE(lane) {
+ if (bytelane_ok & (1 << lane))
+ continue;
+
+ printk(RAM_SPEW, "%d, %d, %02d, %d,"
+ " lane%d sample: %d\n",
+ dqs_setting[lane].coarse,
+ dqs_setting[lane].clk_delay,
+ dqs_setting[lane].tap,
+ dqs_setting[lane].pi,
+ lane,
+ dq_sample[lane]);
+
+ if (dq_sample[lane] > 0) {
+ if (decrement_dq_dqs(s, &dqs_setting[lane])) {
+ printk(BIOS_EMERG,
+ "DQS setting channel%d, "
+ "lane %d reached a minimum!\n",
+ channel, lane);
+ return CB_ERR;
+ }
+ } else {
+ bytelane_ok |= (1 << lane);
+ }
+ dqsset(channel, lane, &dqs_setting[lane]);
+ }
+ }
+
+ printk(RAM_DEBUG, "DQS settings on PASS #0:\n");
+ FOR_EACH_BYTELANE(lane) {
+ printk(RAM_DEBUG, "lane %d: ", lane);
+ print_dll_setting(&dqs_setting[lane], 0);
+ }
+
+ /* Loop 1: Find DQ sample high, by increasing */
+ bytelane_ok = 0;
+ while (bytelane_ok != 0xff) {
+ sample_dq(s, channel, rank, dq_sample);
+ FOR_EACH_BYTELANE(lane) {
+ if (bytelane_ok & (1 << lane))
+ continue;
+
+ printk(RAM_SPEW, "%d, %d, %02d, %d, lane%d sample: %d\n",
+ dqs_setting[lane].coarse,
+ dqs_setting[lane].clk_delay,
+ dqs_setting[lane].tap,
+ dqs_setting[lane].pi,
+ lane,
+ dq_sample[lane]);
+
+ if (dq_sample[lane] == N_SAMPLES) {
+ bytelane_ok |= (1 << lane);
+ } else {
+ if (increment_dq_dqs(s, &dqs_setting[lane])) {
+ printk(BIOS_EMERG,
+ "DQS setting channel%d, "
+ "lane %d reached a maximum!\n",
+ channel, lane);
+ return CB_ERR;
+ }
+ }
+ dqsset(channel, lane, &dqs_setting[lane]);
+ }
+ }
+
+ printk(RAM_DEBUG, "DQS settings on PASS #1:\n");
+ FOR_EACH_BYTELANE(lane) {
+ printk(RAM_DEBUG, "lane %d: ", lane);
+ print_dll_setting(&dqs_setting[lane], 0);
+ }
+
+ printk(BIOS_DEBUG, "final WL DQS settings on CH%d\n", channel);
+ FOR_EACH_BYTELANE(lane) {
+ printk(BIOS_DEBUG, "\tlane%d: ", lane);
+ print_dll_setting(&dqs_setting[lane], 1);
+ s->dqs_settings[channel][lane] = dqs_setting[lane];
+ }
+
+ MCHBAR8(0x24d + 0x400 * channel) = saved_24d;
+ return CB_SUCCESS;
+}
+
+/*
+ * DDR3 uses flyby topology where the clock signal takes a different path
+ * than the data signal, to allow for better signal intergrity.
+ * Therefore the delay on the data signals needs to account for this.
+ * This is done by by sampleling the the DQS write (tx) signal back over
+ * the DQ signal and looking for delay values where the sample transitions
+ * from high to low.
+ * Here the following is done:
+ * - enable write levelling on the first populated rank
+ * - disable output on other populated ranks
+ * - start from safe DQS (tx) delays (other transitions can be
+ * found at different starting values but are generally bad)
+ * - loop0: decrease DQS (tx) delays until low is sampled,
+ * loop1: increase DQS (tx) delays until high is sampled,
+ * That way we are sure to hit a low-high transition
+ * - put all ranks in normal mode of operation again
+ * - note: All ranks need to be leveled together
+ */
+void search_write_leveling(struct sysinfo *s)
+{
+ int i, ch, count;
+ u8 config, rank0, rank1, lane;
+ struct dll_setting dq_setting;
+
+ u8 chanconfig_lut[16]={0, 6, 4, 6, 7, 3, 1, 3, 5, 2, 0, 2, 7, 3, 1, 3};
+
+ u8 odt_force[8][4] = { /* [Config][leveling rank] */
+ {0x5, 0x6, 0x5, 0x9},
+ {0x5, 0x6, 0x5, 0x0},
+ {0x5, 0x0, 0x5, 0x9},
+ {0x5, 0x0, 0x5, 0x0},
+ {0x1, 0x2, 0x0, 0x0},
+ {0x0, 0x0, 0x4, 0x8},
+ {0x1, 0x0, 0x0, 0x0},
+ {0x0, 0x0, 0x4, 0x0}
+ };
+
+ printk(BIOS_DEBUG, "Starting write levelling.\n");
+
+ FOR_EACH_POPULATED_CHANNEL(s->dimms, ch) {
+ printk(BIOS_DEBUG, "\tCH%d\n", ch);
+ config = chanconfig_lut[s->dimm_config[ch]];
+
+ MCHBAR8(0x5d8 + 0x400 * ch) =
+ MCHBAR8(0x5d8 + 0x400 * ch) & ~0x0e;
+ MCHBAR16(0x5c4 + 0x400 * ch) = (MCHBAR16(0x5c4 + 0x400 * ch) &
+ ~0x3fff) | 0x3fff;
+ MCHBAR8(0x265 + 0x400 * ch) =
+ MCHBAR8(0x265 + 0x400 * ch) & ~0x1f;
+ /* find the first populated rank */
+ FOR_EACH_POPULATED_RANK_IN_CHANNEL(s->dimms, ch, rank0)
+ break;
+
+ /* Enable WL for the first populated rank and disable output
+ for others */
+ FOR_EACH_POPULATED_RANK_IN_CHANNEL(s->dimms, ch, rank1)
+ set_rank_write_level(s, ch, config, rank1, rank0, 1);
+
+ MCHBAR8(0x298 + 2 + 0x400 * ch) =
+ (MCHBAR8(0x298 + 2 + 0x400 * ch) & ~0x0f)
+ | odt_force[config][rank0];
+ MCHBAR8(0x271 + 0x400 * ch) = (MCHBAR8(0x271 + 0x400 * ch)
+ & ~0x7e) | 0x4e;
+ MCHBAR8(0x5d9 + 0x400 * ch) =
+ (MCHBAR8(0x5d9 + 0x400 * ch) & ~0x04) | 0x04;
+ MCHBAR32(0x1a0) = (MCHBAR32(0x1a0) & ~0x07ffffff)
+ | 0x00014000;
+
+ if (increment_to_dqs_edge(s, ch, rank0))
+ die("Write Leveling failed!");
+
+ MCHBAR8(0x298 + 2 + 0x400 * ch) =
+ MCHBAR8(0x298 + 2 + 0x400 * ch) & ~0x0f;
+ MCHBAR8(0x271 + 0x400 * ch) =
+ (MCHBAR8(0x271 + 0x400 * ch) & ~0x7e)
+ | 0x0e;
+ MCHBAR8(0x5d9 + 0x400 * ch) =
+ (MCHBAR8(0x5d9 + 0x400 * ch) & ~0x04);
+ MCHBAR32(0x1a0) = (MCHBAR32(0x1a0)
+ & ~0x07ffffff) | 0x00555801;
+
+ /* Disable WL on the trained rank */
+ set_rank_write_level(s, ch, config, rank0, rank0, 0);
+ send_jedec_cmd(s, rank0, ch, NORMALOP_CMD, 1 << 12);
+
+ MCHBAR8(0x5d8 + 0x400 * ch) = (MCHBAR8(0x5d8 + 0x400 * ch)
+ & ~0x0e) | 0x0e;
+ MCHBAR16(0x5c4 + 0x400 * ch) = (MCHBAR16(0x5c4 + 0x400 * ch)
+ & ~0x3fff) | 0x1807;
+ MCHBAR8(0x265 + 0x400 * ch) = MCHBAR8(0x265 + 0x400 * ch) & ~0x1f;
+
+ /* Disable write level mode for all ranks */
+ FOR_EACH_POPULATED_RANK_IN_CHANNEL(s->dimms, ch, rank0)
+ set_rank_write_level(s, ch, config, rank0, rank0, 0);
+ }
+
+ MCHBAR8(0x5dc) = (MCHBAR8(0x5dc) & ~0x80) | 0x80;
+
+ /* Increment DQ (rx) dll setting by a standard amount past DQS,
+ This is further trained in write training. */
+ switch (s->selected_timings.mem_clk) {
+ default:
+ case MEM_CLOCK_800MHz:
+ count = 39;
+ break;
+ case MEM_CLOCK_1066MHz:
+ count = 32;
+ break;
+ case MEM_CLOCK_1333MHz:
+ count = 42;
+ break;
+ }
+
+ FOR_EACH_POPULATED_CHANNEL_AND_BYTELANE(s->dimms, ch, lane) {
+ dq_setting = s->dqs_settings[ch][lane];
+ for (i = 0; i < count; i++)
+ if (increment_dq_dqs(s, &dq_setting))
+ die("Can't further increase DQ past DQS delay");
+ dqset(ch, lane, &dq_setting);
+ }
+
+ printk(BIOS_DEBUG, "Done write levelling.\n");
+}
diff --git a/src/northbridge/intel/x4x/raminit_ddr23.c b/src/northbridge/intel/x4x/raminit_ddr23.c
index 6d6111c5c4..618e21215c 100644
--- a/src/northbridge/intel/x4x/raminit_ddr23.c
+++ b/src/northbridge/intel/x4x/raminit_ddr23.c
@@ -1361,8 +1361,7 @@ static u32 mirror_shift_bit(const u32 data, u8 bit)
return (data & ~(3 << bit)) | temp0 | temp1;
}
-static void send_jedec_cmd(const struct sysinfo *s, u8 r,
- u8 ch, u8 cmd, u32 val)
+void send_jedec_cmd(const struct sysinfo *s, u8 r, u8 ch, u8 cmd, u32 val)
{
u32 addr = test_address(ch, r);
volatile u32 rubbish;
@@ -1933,6 +1932,24 @@ static void power_settings(struct sysinfo *s)
MCHBAR8(0x561 + (lane << 2)) = MCHBAR8(0x561 + (lane << 2)) & ~(1 << 3);
}
+static void software_ddr3_reset(struct sysinfo *s)
+{
+ printk(BIOS_DEBUG, "Software initiated DDR3 reset.\n");
+ MCHBAR8(0x1a8) = MCHBAR8(0x1a8) | 0x02;
+ MCHBAR8(0x5da) = MCHBAR8(0x5da) & ~0x80;
+ MCHBAR8(0x1a8) = MCHBAR8(0x1a8) & ~0x02;
+ MCHBAR8(0x5da) = (MCHBAR8(0x5da) & ~0x03) | 1;
+ udelay(200);
+ MCHBAR8(0x1a8) = MCHBAR8(0x1a8) & ~0x02;
+ MCHBAR8(0x5da) = MCHBAR8(0x5da) | 0x80;
+ MCHBAR8(0x5da) = MCHBAR8(0x5da) & ~0x80;
+ udelay(500);
+ MCHBAR8(0x5da) = MCHBAR8(0x5da) | 0x03;
+ MCHBAR8(0x5da) = MCHBAR8(0x5da) & ~0x03;
+ /* After write leveling the dram needs to be reset and reinitialised */
+ jedec_ddr3(s);
+}
+
void do_raminit(struct sysinfo *s, int fast_boot)
{
u8 ch;
@@ -2019,6 +2036,17 @@ void do_raminit(struct sysinfo *s, int fast_boot)
MCHBAR8(0x9d8) = MCHBAR8(0x9d8) | 0x7;
}
+ /* DDR3 reset */
+ if ((s->spd_type == DDR3) && (s->boot_path != BOOT_PATH_RESUME)) {
+ printk(BIOS_DEBUG, "DDR3 Reset.\n");
+ MCHBAR8(0x1a8) = MCHBAR8(0x1a8) & ~0x2;
+ MCHBAR8(0x5da) = MCHBAR8(0x5da) | 0x80;
+ udelay(500);
+ MCHBAR8(0x1a8) = MCHBAR8(0x1a8) & ~0x2;
+ MCHBAR8(0x5da) = MCHBAR8(0x5da) & ~0x80;
+ udelay(500);
+ }
+
// Pre jedec
MCHBAR8(0x40) = MCHBAR8(0x40) | 0x2;
FOR_EACH_POPULATED_CHANNEL(s->dimms, ch) {
@@ -2038,6 +2066,13 @@ void do_raminit(struct sysinfo *s, int fast_boot)
printk(BIOS_DEBUG, "Done jedec steps\n");
+ if (s->spd_type == DDR3) {
+ if (!fast_boot)
+ search_write_leveling(s);
+ if (s->boot_path == BOOT_PATH_NORMAL)
+ software_ddr3_reset(s);
+ }
+
// After JEDEC reset
MCHBAR8(0x40) = MCHBAR8(0x40) & ~0x2;
FOR_EACH_POPULATED_CHANNEL(s->dimms, ch) {
diff --git a/src/northbridge/intel/x4x/x4x.h b/src/northbridge/intel/x4x/x4x.h
index 53b73ae364..34979a01da 100644
--- a/src/northbridge/intel/x4x/x4x.h
+++ b/src/northbridge/intel/x4x/x4x.h
@@ -373,6 +373,8 @@ void rt_set_dqs(u8 channel, u8 lane, u8 rank,
struct rt_dqs_setting *dqs_setting);
int do_write_training(struct sysinfo *s);
int do_read_training(struct sysinfo *s);
+void search_write_leveling(struct sysinfo *s);
+void send_jedec_cmd(const struct sysinfo *s, u8 r, u8 ch, u8 cmd, u32 val);
extern const struct dll_setting default_ddr2_667_ctrl[7];
extern const struct dll_setting default_ddr2_800_ctrl[7];
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-02 18:48:21 +0000