src/northbridge/intel/sandybridge/early_dmi.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <arch/cpu.h>
#include <console/console.h>
#include <cpu/intel/model_206ax/model_206ax.h>
#include <northbridge/intel/sandybridge/sandybridge.h>
#include <southbridge/intel/bd82x6x/pch.h>

static void dmi_recipe(void)
{
	const u32 cpuid = cpu_get_cpuid();

	int i;

	/* The DMI recipe is only needed on Ivy Bridge */
	if (!IS_IVY_CPU(cpuid))
		return;

	for (i = 0; i < 2; i++) {
		dmibar_setbits32(0x0914 + (i << 5), 1 << 31);
	}

	for (i = 0; i < 4; i++) {
		dmibar_clrbits32(0x0a00 + (i << 4), 3 << 26);
		dmibar_setbits32(0x0a04 + (i << 4), 1 << 11);
	}
	dmibar_clrsetbits32(0x0c30, 0xf << 28, 1 << 30);

	for (i = 0; i < 2; i++) {
		dmibar_clrbits32(0x0904 + (i << 5), 7 << 22);
		dmibar_clrbits32(0x090c + (i << 5), 7 << 17);
	}

	for (i = 0; i < 2; i++) {
		dmibar_clrbits32(0x090c + (i << 5), 0xf << 21);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0904 + (i << 5));	// !!! = 0x7a1842ec
		dmibar_write32(0x0904 + (i << 5), 0x7a1842ec);
		dmibar_read32(0x090c + (i << 5));	// !!! = 0x00000208
		dmibar_write32(0x090c + (i << 5), 0x00000128);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0700 + (i << 5));	// !!! = 0x46139008
		dmibar_write32(0x0700 + (i << 5), 0x46139008);
	}

	dmibar_read32(0x0c04);	// !!! = 0x2e680008
	dmibar_write32(0x0c04, 0x2e680008);

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0904 + (i << 5));	// !!! = 0x7a1842ec
		dmibar_write32(0x0904 + (i << 5), 0x3a1842ec);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0910 + (i << 5));	// !!! = 0x00006300
		dmibar_write32(0x0910 + (i << 5), 0x00004300);
	}

	for (i = 0; i < 4; i++) {
		dmibar_read32(0x0a00 + (i << 4));	// !!! = 0x03042010
		dmibar_write32(0x0a00 + (i << 4), 0x03042018);
	}

	dmibar_read32(0x0c00);	// !!! = 0x29700c08
	dmibar_write32(0x0c00, 0x29700c08);

	for (i = 0; i < 4; i++) {
		dmibar_read32(0x0a04 + (i << 4));	// !!! = 0x0c0708f0
		dmibar_write32(0x0a04 + (i << 4), 0x0c0718f0);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0900 + (i << 5));	// !!! = 0x50000000
		dmibar_write32(0x0900 + (i << 5), 0x50000000);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0908 + (i << 5));	// !!! = 0x51ffffff
		dmibar_write32(0x0908 + (i << 5), 0x51ffffff);
	}

	for (i = 0; i < 4; i++) {
		dmibar_read32(0x0a00 + (i << 4));	// !!! = 0x03042018
		dmibar_write32(0x0a00 + (i << 4), 0x03042018);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0700 + (i << 5));	// !!! = 0x46139008
		dmibar_write32(0x0700 + (i << 5), 0x46139008);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0904 + (i << 5));	// !!! = 0x3a1842ec
		dmibar_write32(0x0904 + (i << 5), 0x3a1846ec);
	}

	for (i = 0; i < 4; i++) {
		dmibar_read32(0x0a00 + (i << 4));	// !!! = 0x03042018
		dmibar_write32(0x0a00 + (i << 4), 0x03042018);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0908 + (i << 5));	// !!! = 0x51ffffff
		dmibar_write32(0x0908 + (i << 5), 0x51ffffff);
	}

	dmibar_read32(0x0c00);	// !!! = 0x29700c08
	dmibar_write32(0x0c00, 0x29700c08);

	dmibar_read32(0x0c0c);	// !!! = 0x16063400
	dmibar_write32(0x0c0c, 0x00063400);

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0700 + (i << 5));	// !!! = 0x46139008
		dmibar_write32(0x0700 + (i << 5), 0x46339008);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0700 + (i << 5));	// !!! = 0x46339008
		dmibar_write32(0x0700 + (i << 5), 0x45339008);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0700 + (i << 5));	// !!! = 0x45339008
		dmibar_write32(0x0700 + (i << 5), 0x453b9008);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0700 + (i << 5));	// !!! = 0x453b9008
		dmibar_write32(0x0700 + (i << 5), 0x45bb9008);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0700 + (i << 5));	// !!! = 0x45bb9008
		dmibar_write32(0x0700 + (i << 5), 0x45fb9008);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0914 + (i << 5));	// !!! = 0x9021a080
		dmibar_write32(0x0914 + (i << 5), 0x9021a280);
	}

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0914 + (i << 5));	// !!! = 0x9021a080
		dmibar_write32(0x0914 + (i << 5), 0x9821a280);
	}

	for (i = 0; i < 4; i++) {
		dmibar_read32(0x0a00 + (i << 4));	// !!! = 0x03042018
		dmibar_write32(0x0a00 + (i << 4), 0x03242018);
	}

	dmibar_read32(0x0258);	// !!! = 0x40000600
	dmibar_write32(0x0258, 0x60000600);

	for (i = 0; i < 2; i++) {
		dmibar_read32(0x0904 + (i << 5));	// !!! = 0x3a1846ec
		dmibar_write32(0x0904 + (i << 5), 0x2a1846ec);
		dmibar_read32(0x0914 + (i << 5));	// !!! = 0x9821a280
		dmibar_write32(0x0914 + (i << 5), 0x98200280);
	}

	dmibar_read32(DMIL0SLAT);	// !!! = 0x00c26460
	dmibar_write32(DMIL0SLAT, 0x00c2403c);
}

void early_init_dmi(void)
{
	dmi_recipe();

	early_pch_init_native_dmi_pre();

	/* Write once settings */
	dmibar_clrsetbits32(DMILCAP, 0x3f00f,
			    (2 <<  0) |	// 5GT/s
			    (2 << 12) |	// L0s 128 ns to less than 256 ns
			    (2 << 15));	// L1 2 us to less than 4 us

	dmibar_setbits8(DMILCTL, 1 << 5);	// Retrain link
	while (dmibar_read16(DMILSTS) & TXTRN)
		;

	dmibar_setbits8(DMILCTL, 1 << 5);	// Retrain link
	while (dmibar_read16(DMILSTS) & TXTRN)
		;

	const u8  w = (dmibar_read16(DMILSTS) >> 4) & 0x1f;
	const u16 t = (dmibar_read16(DMILSTS) & 0x0f) * 2500;

	printk(BIOS_DEBUG, "DMI: Running at X%x @ %dMT/s\n", w, t);
	/*
	 * Virtual Channel resources must match settings in RCBA!
	 *
	 * Channel Vp and Vm are documented in:
	 * "Desktop 4th Generation Intel Core Processor Family, Desktop Intel Pentium
	 *  Processor Family, and Desktop Intel Celeron Processor Family Vol. 2"
	 */

	/* Channel 0: Enable, Set ID to 0, map TC0 and TC3 and TC4 to VC0. */
	dmibar_write32(DMIVC0RCTL, 1 << 31 | 0 << 24 | 0x0c << 1 | 1);
	/* Channel 1: Enable, Set ID to 1, map TC1 and TC5 to VC1. */
	dmibar_write32(DMIVC1RCTL, 1 << 31 | 1 << 24 | 0x11 << 1);
	/* Channel p: Enable, Set ID to 2, map TC2 and TC6 to VCp  */
	dmibar_write32(DMIVCPRCTL, 1 << 31 | 2 << 24 | 0x22 << 1);
	/* Channel m: Enable, Set ID to 0, map TC7 to VCm */
	dmibar_write32(DMIVCMRCTL, 1 << 31 | 7 << 24 | 0x40 << 1);

	/* Set Extended VC Count (EVCC) to 1 as Channel 1 is active. */
	dmibar_setbits8(DMIPVCCAP1, 1 << 0);

	early_pch_init_native_dmi_post();

	/*
	 * BIOS Requirement: Check if DMI VC Negotiation was successful.
	 * Wait for virtual channels negotiation pending.
	 */
	while (dmibar_read16(DMIVC0RSTS) & VC0NP)
		;
	while (dmibar_read16(DMIVC1RSTS) & VC1NP)
		;
	while (dmibar_read16(DMIVCPRSTS) & VCPNP)
		;
	while (dmibar_read16(DMIVCMRSTS) & VCMNP)
		;
}