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From 77a89d55ab7a715dc20c34a6edacaaf781b56087 Mon Sep 17 00:00:00 2001
From: Angel Pons <th3fanbus@gmail.com>
Date: Sat, 7 May 2022 14:36:10 +0200
Subject: [PATCH 11/26] haswell NRI: Initialise MPLL
Add code to initialise the MPLL (Memory PLL). The procedure is similar
to the one for Sandy/Ivy Bridge, but it is not worth factoring out.
Change-Id: I978c352de68f6d8cecc76f4ae3c12daaf4be9ed6
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
---
.../intel/haswell/native_raminit/Makefile.inc | 2 +
.../intel/haswell/native_raminit/init_mpll.c | 210 ++++++++++++++++++
.../haswell/native_raminit/io_comp_control.c | 22 ++
.../haswell/native_raminit/raminit_main.c | 1 +
.../haswell/native_raminit/raminit_native.h | 11 +
.../intel/haswell/registers/mchbar.h | 3 +
6 files changed, 249 insertions(+)
create mode 100644 src/northbridge/intel/haswell/native_raminit/init_mpll.c
create mode 100644 src/northbridge/intel/haswell/native_raminit/io_comp_control.c
diff --git a/src/northbridge/intel/haswell/native_raminit/Makefile.inc b/src/northbridge/intel/haswell/native_raminit/Makefile.inc
index ebf7abc6ec..c125d84f0b 100644
--- a/src/northbridge/intel/haswell/native_raminit/Makefile.inc
+++ b/src/northbridge/intel/haswell/native_raminit/Makefile.inc
@@ -1,5 +1,7 @@
## SPDX-License-Identifier: GPL-2.0-or-later
+romstage-y += init_mpll.c
+romstage-y += io_comp_control.c
romstage-y += raminit_main.c
romstage-y += raminit_native.c
romstage-y += spd_bitmunching.c
diff --git a/src/northbridge/intel/haswell/native_raminit/init_mpll.c b/src/northbridge/intel/haswell/native_raminit/init_mpll.c
new file mode 100644
index 0000000000..2faa183724
--- /dev/null
+++ b/src/northbridge/intel/haswell/native_raminit/init_mpll.c
@@ -0,0 +1,210 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <commonlib/clamp.h>
+#include <console/console.h>
+#include <delay.h>
+#include <device/pci_ops.h>
+#include <northbridge/intel/haswell/haswell.h>
+#include <types.h>
+
+#include "raminit_native.h"
+
+static uint32_t get_mem_multiplier(const struct sysinfo *ctrl)
+{
+ const uint32_t mult = NS2MHZ_DIV256 / (ctrl->tCK * ctrl->base_freq);
+
+ if (ctrl->base_freq == 100)
+ return clamp_u32(7, mult, 12);
+
+ if (ctrl->base_freq == 133)
+ return clamp_u32(3, mult, 10);
+
+ die("Unsupported base frequency\n");
+}
+
+static void normalize_tck(struct sysinfo *ctrl, const bool pll_ref100)
+{
+ /** TODO: Haswell supports up to DDR3-2600 **/
+ if (ctrl->tCK <= TCK_1200MHZ) {
+ ctrl->tCK = TCK_1200MHZ;
+ ctrl->base_freq = 133;
+ ctrl->mem_clock_mhz = 1200;
+
+ } else if (ctrl->tCK <= TCK_1100MHZ) {
+ ctrl->tCK = TCK_1100MHZ;
+ ctrl->base_freq = 100;
+ ctrl->mem_clock_mhz = 1100;
+
+ } else if (ctrl->tCK <= TCK_1066MHZ) {
+ ctrl->tCK = TCK_1066MHZ;
+ ctrl->base_freq = 133;
+ ctrl->mem_clock_mhz = 1066;
+
+ } else if (ctrl->tCK <= TCK_1000MHZ) {
+ ctrl->tCK = TCK_1000MHZ;
+ ctrl->base_freq = 100;
+ ctrl->mem_clock_mhz = 1000;
+
+ } else if (ctrl->tCK <= TCK_933MHZ) {
+ ctrl->tCK = TCK_933MHZ;
+ ctrl->base_freq = 133;
+ ctrl->mem_clock_mhz = 933;
+
+ } else if (ctrl->tCK <= TCK_900MHZ) {
+ ctrl->tCK = TCK_900MHZ;
+ ctrl->base_freq = 100;
+ ctrl->mem_clock_mhz = 900;
+
+ } else if (ctrl->tCK <= TCK_800MHZ) {
+ ctrl->tCK = TCK_800MHZ;
+ ctrl->base_freq = 133;
+ ctrl->mem_clock_mhz = 800;
+
+ } else if (ctrl->tCK <= TCK_700MHZ) {
+ ctrl->tCK = TCK_700MHZ;
+ ctrl->base_freq = 100;
+ ctrl->mem_clock_mhz = 700;
+
+ } else if (ctrl->tCK <= TCK_666MHZ) {
+ ctrl->tCK = TCK_666MHZ;
+ ctrl->base_freq = 133;
+ ctrl->mem_clock_mhz = 666;
+
+ } else if (ctrl->tCK <= TCK_533MHZ) {
+ ctrl->tCK = TCK_533MHZ;
+ ctrl->base_freq = 133;
+ ctrl->mem_clock_mhz = 533;
+
+ } else if (ctrl->tCK <= TCK_400MHZ) {
+ ctrl->tCK = TCK_400MHZ;
+ ctrl->base_freq = 133;
+ ctrl->mem_clock_mhz = 400;
+
+ } else {
+ ctrl->tCK = 0;
+ ctrl->base_freq = 1;
+ ctrl->mem_clock_mhz = 0;
+ return;
+ }
+ if (!pll_ref100 && ctrl->base_freq == 100) {
+ /* Skip unsupported frequency */
+ ctrl->tCK++;
+ normalize_tck(ctrl, pll_ref100);
+ }
+}
+
+#define MIN_CAS 4
+#define MAX_CAS 24
+
+static uint8_t find_compatible_cas(struct sysinfo *ctrl)
+{
+ printk(RAM_DEBUG, "With tCK %u, try CAS: ", ctrl->tCK);
+ const uint8_t cas_lower = MAX(MIN_CAS, DIV_ROUND_UP(ctrl->tAA, ctrl->tCK));
+ const uint8_t cas_upper = MIN(MAX_CAS, 19); /* JEDEC MR0 limit */
+
+ if (!(ctrl->cas_supported >> (cas_lower - MIN_CAS))) {
+ printk(RAM_DEBUG, "DIMMs do not support CAS >= %u\n", cas_lower);
+ ctrl->tCK++;
+ return 0;
+ }
+ for (uint8_t cas = cas_lower; cas <= cas_upper; cas++) {
+ printk(RAM_DEBUG, "%u ", cas);
+ if (ctrl->cas_supported & BIT(cas - MIN_CAS)) {
+ printk(RAM_DEBUG, "OK\n");
+ return cas;
+ }
+ }
+ return 0;
+}
+
+static enum raminit_status find_cas_tck(struct sysinfo *ctrl)
+{
+ /** TODO: Honor all possible PLL_REF100_CFG values **/
+ uint8_t pll_ref100 = (pci_read_config32(HOST_BRIDGE, CAPID0_B) >> 21) & 0x7;
+ printk(RAM_DEBUG, "PLL_REF100_CFG value: 0x%x\n", pll_ref100);
+ printk(RAM_DEBUG, "100MHz reference clock support: %s\n", pll_ref100 ? "yes" : "no");
+
+ uint8_t selected_cas;
+ while (true) {
+ /* Round tCK up so that it is a multiple of either 133 or 100 MHz */
+ normalize_tck(ctrl, pll_ref100);
+ if (!ctrl->tCK) {
+ printk(BIOS_ERR, "Couldn't find compatible clock / CAS settings\n");
+ return RAMINIT_STATUS_MPLL_INIT_FAILURE;
+ }
+ selected_cas = find_compatible_cas(ctrl);
+ if (selected_cas)
+ break;
+
+ ctrl->tCK++;
+ }
+ printk(BIOS_DEBUG, "Found compatible clock / CAS settings\n");
+ printk(BIOS_DEBUG, "Selected DRAM frequency: %u MHz\n", NS2MHZ_DIV256 / ctrl->tCK);
+ printk(BIOS_DEBUG, "Selected CAS latency : %uT\n", selected_cas);
+ ctrl->multiplier = get_mem_multiplier(ctrl);
+ return RAMINIT_STATUS_SUCCESS;
+}
+
+enum raminit_status initialise_mpll(struct sysinfo *ctrl)
+{
+ if (ctrl->tCK > TCK_400MHZ) {
+ printk(BIOS_ERR, "tCK is too slow. Increasing to 400 MHz as last resort\n");
+ ctrl->tCK = TCK_400MHZ;
+ }
+ while (true) {
+ if (!ctrl->qclkps) {
+ const enum raminit_status status = find_cas_tck(ctrl);
+ if (status)
+ return status;
+ }
+
+ /*
+ * Unlike previous generations, Haswell's MPLL won't shut down if the
+ * requested frequency isn't supported. But we cannot reinitialize it.
+ * Another different thing: MPLL registers are 4-bit instead of 8-bit.
+ */
+
+ /** FIXME: Obtain current clock frequency if we want to skip this **/
+ //if (mchbar_read32(MC_BIOS_DATA) != 0)
+ // break;
+
+ uint32_t mc_bios_req = ctrl->multiplier;
+ if (ctrl->base_freq == 100) {
+ /* Use 100 MHz reference clock */
+ mc_bios_req |= BIT(4);
+ }
+ mc_bios_req |= BIT(31);
+ printk(RAM_DEBUG, "MC_BIOS_REQ = 0x%08x\n", mc_bios_req);
+ printk(BIOS_DEBUG, "MPLL busy... ");
+ mchbar_write32(MC_BIOS_REQ, mc_bios_req);
+
+ for (unsigned int i = 0; i <= 5000; i++) {
+ if (!(mchbar_read32(MC_BIOS_REQ) & BIT(31))) {
+ printk(BIOS_DEBUG, "done in %u us\n", i);
+ break;
+ }
+ udelay(1);
+ }
+ if (mchbar_read32(MC_BIOS_REQ) & BIT(31))
+ printk(BIOS_DEBUG, "did not lock\n");
+
+ /* Verify locked frequency */
+ const uint32_t mc_bios_data = mchbar_read32(MC_BIOS_DATA);
+ printk(RAM_DEBUG, "MC_BIOS_DATA = 0x%08x\n", mc_bios_data);
+ if ((mc_bios_data & 0xf) >= ctrl->multiplier)
+ break;
+
+ printk(BIOS_DEBUG, "Retrying at a lower frequency\n\n");
+ ctrl->tCK++;
+ }
+ if (!ctrl->mem_clock_mhz) {
+ printk(BIOS_ERR, "Could not program MPLL frequency\n");
+ return RAMINIT_STATUS_MPLL_INIT_FAILURE;
+ }
+ printk(BIOS_DEBUG, "MPLL frequency is set to: %u MHz ", ctrl->mem_clock_mhz);
+ ctrl->mem_clock_fs = 1000000000 / ctrl->mem_clock_mhz;
+ printk(BIOS_DEBUG, "(period: %u femtoseconds)\n", ctrl->mem_clock_fs);
+ ctrl->qclkps = ctrl->mem_clock_fs / 2000;
+ printk(BIOS_DEBUG, "Quadrature clock period: %u picoseconds\n", ctrl->qclkps);
+ return wait_for_first_rcomp();
+}
diff --git a/src/northbridge/intel/haswell/native_raminit/io_comp_control.c b/src/northbridge/intel/haswell/native_raminit/io_comp_control.c
new file mode 100644
index 0000000000..7e96c08938
--- /dev/null
+++ b/src/northbridge/intel/haswell/native_raminit/io_comp_control.c
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <commonlib/clamp.h>
+#include <console/console.h>
+#include <northbridge/intel/haswell/haswell.h>
+#include <timer.h>
+#include <types.h>
+
+#include "raminit_native.h"
+
+enum raminit_status wait_for_first_rcomp(void)
+{
+ struct stopwatch timer;
+ stopwatch_init_msecs_expire(&timer, 2000);
+ do {
+ if (mchbar_read32(RCOMP_TIMER) & BIT(16))
+ return RAMINIT_STATUS_SUCCESS;
+
+ } while (!stopwatch_expired(&timer));
+ printk(BIOS_ERR, "Timed out waiting for RCOMP to complete\n");
+ return RAMINIT_STATUS_POLL_TIMEOUT;
+}
diff --git a/src/northbridge/intel/haswell/native_raminit/raminit_main.c b/src/northbridge/intel/haswell/native_raminit/raminit_main.c
index 2d2cfa48bb..09545422c0 100644
--- a/src/northbridge/intel/haswell/native_raminit/raminit_main.c
+++ b/src/northbridge/intel/haswell/native_raminit/raminit_main.c
@@ -21,6 +21,7 @@ struct task_entry {
static const struct task_entry cold_boot[] = {
{ collect_spd_info, true, "PROCSPD", },
+ { initialise_mpll, true, "INITMPLL", },
};
/* Return a generic stepping value to make stepping checks simpler */
diff --git a/src/northbridge/intel/haswell/native_raminit/raminit_native.h b/src/northbridge/intel/haswell/native_raminit/raminit_native.h
index 1a0793947e..a54581abc7 100644
--- a/src/northbridge/intel/haswell/native_raminit/raminit_native.h
+++ b/src/northbridge/intel/haswell/native_raminit/raminit_native.h
@@ -23,6 +23,8 @@ enum raminit_status {
RAMINIT_STATUS_SUCCESS = 0,
RAMINIT_STATUS_NO_MEMORY_INSTALLED,
RAMINIT_STATUS_UNSUPPORTED_MEMORY,
+ RAMINIT_STATUS_MPLL_INIT_FAILURE,
+ RAMINIT_STATUS_POLL_TIMEOUT,
RAMINIT_STATUS_UNSPECIFIED_ERROR, /** TODO: Deprecated in favor of specific values **/
};
@@ -82,10 +84,19 @@ struct sysinfo {
uint8_t rankmap[NUM_CHANNELS];
uint8_t rank_mirrored[NUM_CHANNELS];
uint32_t channel_size_mb[NUM_CHANNELS];
+
+ uint8_t base_freq; /* Memory base frequency, either 100 or 133 MHz */
+ uint32_t multiplier;
+ uint32_t mem_clock_mhz;
+ uint32_t mem_clock_fs; /* Memory clock period in femtoseconds */
+ uint32_t qclkps; /* Quadrature clock period in picoseconds */
};
void raminit_main(enum raminit_boot_mode bootmode);
enum raminit_status collect_spd_info(struct sysinfo *ctrl);
+enum raminit_status initialise_mpll(struct sysinfo *ctrl);
+
+enum raminit_status wait_for_first_rcomp(void);
#endif
diff --git a/src/northbridge/intel/haswell/registers/mchbar.h b/src/northbridge/intel/haswell/registers/mchbar.h
index 5610e7089a..45f8174995 100644
--- a/src/northbridge/intel/haswell/registers/mchbar.h
+++ b/src/northbridge/intel/haswell/registers/mchbar.h
@@ -13,6 +13,8 @@
#define MC_INIT_STATE_G 0x5030
#define MRC_REVISION 0x5034 /* MRC Revision */
+#define RCOMP_TIMER 0x5084
+
#define MC_LOCK 0x50fc /* Memory Controller Lock register */
#define GFXVTBAR 0x5400 /* Base address for IGD */
@@ -61,6 +63,7 @@
#define BIOS_RESET_CPL 0x5da8 /* 8-bit */
+#define MC_BIOS_REQ 0x5e00 /* Memory frequency request register */
#define MC_BIOS_DATA 0x5e04 /* Miscellaneous information for BIOS */
#define SAPMCTL 0x5f00
--
2.39.2
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