soc/intel/baytrail: Add native refcode replacement

- This is a reverse engineered re-implementation of refcode.elf on
	Bay Trail
- Tested on GBYT4, should work everywhere as it's meant to behave
	exactly the same as the binary refcode

Signed-off-by: Mate Kukri <kukri.mate@gmail.com>
Change-Id: I91977c509022b0078804dc151d27296260e24bc4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43133
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 116 insertions, 0 deletions

diff --git a/src/soc/intel/baytrail/refcode_native.c b/src/soc/intel/baytrail/refcode_native.c
new file mode 100644
index 0000000000..a9976fb409
--- /dev/null
+++ b/src/soc/intel/baytrail/refcode_native.c
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/mmio.h>
+#include <console/console.h>
+#include <cpu/x86/tsc.h>
+#include <device/pci.h>
+#include <delay.h>
+#include <soc/pci_devs.h>
+#include <soc/lpc.h>
+#include <soc/iosf.h>
+#include <soc/iomap.h>
+#include <soc/ramstage.h>
+#include <soc/modphy_table.h>
+
+#define IOSF_READ(op_read, port) \
+	(IOSF_OPCODE(op_read) | IOSF_PORT(port))
+#define IOSF_WRITE(op_write, port) \
+	(IOSF_OPCODE(op_write) | IOSF_PORT(port))
+
+static void program_modphy_table(struct modphy_entry *table)
+{
+	u32 tmp;
+
+	for (; table->port; ++table) {
+		tmp = iosf_read_port(IOSF_READ(table->op_read, table->port), table->reg);
+		iosf_write_port(IOSF_WRITE(table->op_write, table->port), table->reg,
+			(tmp & table->mask) | table->value);
+	}
+}
+
+static void gpio_sc_sdcard_workaround(void)
+{
+	setbits32((char *) IO_BASE_ADDRESS + 0x698, (1 << 0));
+	setbits32((char *) IO_BASE_ADDRESS + 0x698, (1 << 2));
+	clrbits32((char *) IO_BASE_ADDRESS + 0x698, (1 << 1));
+	clrbits32((char *) IO_BASE_ADDRESS + 0x690, (1 << 3));
+	udelay(100);
+	clrbits32((char *) IO_BASE_ADDRESS + 0x698, (1 << 0));
+	udelay(100);
+	write32((char *) IO_BASE_ADDRESS + 0x830, 0x78480);
+	udelay(40);
+	write32((char *) IO_BASE_ADDRESS + 0x830, 0x78080);
+	setbits32((char *) IO_BASE_ADDRESS + 0x698, (1 << 0));
+	udelay(100);
+	setbits32((char *) IO_BASE_ADDRESS + 0x698, (1 << 1));
+	clrbits32((char *) IO_BASE_ADDRESS + 0x698, (1 << 2));
+	clrsetbits32((char *) IO_BASE_ADDRESS + 0x690, 7, (1 << 0));
+}
+
+#define BUNIT_BALIMIT0	0x0b
+#define AUNIT_AVCCTL	0x21
+#define AUNIT_ACFCACV	0x60
+#define CUNIT_ACCESS_CTRL_VIOL	0x41
+#define CUINT_SSA_REGIONAL_TRUNKGATE_CTL	0x43
+#define TUNIT_CTL	0x03
+#define TUNIT_MISC_CTL	0x04
+
+static void ssa_safe_config(void)
+{
+	u32 tmp;
+
+	tmp = iosf_bunit_read(BUNIT_BALIMIT0);
+	iosf_bunit_write(BUNIT_BALIMIT0, (tmp & 0xC0D0D0D0) | 0x1F2F2F2F);
+
+	tmp = iosf_aunit_read(AUNIT_AVCCTL);
+	iosf_aunit_write(AUNIT_AVCCTL, tmp | 0x80000100);
+
+	tmp = iosf_aunit_read(AUNIT_ACFCACV);
+	iosf_aunit_write(AUNIT_ACFCACV, tmp & 0x7FFFFFFF);
+
+	tmp = iosf_cunit_read(CUNIT_ACCESS_CTRL_VIOL);
+	iosf_cunit_write(CUNIT_ACCESS_CTRL_VIOL, tmp & 0x7FFFFFFF);
+
+	iosf_cunit_write(CUINT_SSA_REGIONAL_TRUNKGATE_CTL, 0x70008);
+
+	tmp = iosf_cpu_bus_read(TUNIT_CTL);
+	iosf_cpu_bus_write(TUNIT_CTL, tmp | 0x110430);
+
+	tmp = iosf_cpu_bus_read(TUNIT_MISC_CTL);
+	iosf_cpu_bus_write(TUNIT_MISC_CTL, tmp | 0x40010);
+}
+
+#define R_PCH_PMC_MTPMC1 0xb0
+
+/*
+ * Replacement for refcode.elf
+ */
+void baytrail_run_reference_code(void)
+{
+	u32 tmp;
+	size_t pollcnt;
+
+	printk(BIOS_DEBUG, "ModPHY init entry\n");
+
+	if (pci_read_config8(pcidev_on_root(LPC_DEV, LPC_FUNC), REVID) < RID_B_STEPPING_START) {
+		printk(BIOS_DEBUG, "SOC A0/A1 ModPhy Table programming\n");
+		program_modphy_table(reva0_modphy_table);
+	} else {
+		printk(BIOS_DEBUG, "SOC B0 and later ModPhy Table programming\n");
+		program_modphy_table(revb0_modphy_table);
+	}
+
+	setbits32((char *) PMC_BASE_ADDRESS + R_PCH_PMC_MTPMC1, 8);
+
+	for (pollcnt = 0; pollcnt < 10; ++pollcnt) {
+		tmp = read32((char *) PMC_BASE_ADDRESS + R_PCH_PMC_MTPMC1);
+		printk(BIOS_DEBUG, "Polling bit3 of R_PCH_PMC_MTPMC1 = %x\n", tmp);
+		if (!(tmp & 8))
+			break;
+	}
+
+	gpio_sc_sdcard_workaround();
+	ssa_safe_config();
+
+	printk(BIOS_DEBUG, "ModPHY init done\n");
+}