haswell platforms: restructure romstage main

There was a mix of setup code sprinkled across the various components:
southbridge code in the northbridge, etc. This commit reorganizes the
code so that northbridge code doesn't initialize southbridge components.
Additionally, the calling dram initialization no longer calls out to ME
code. The main() function in the mainboard calls the necessary ME
functions before and after dram initialization.

The biggest change is the addition of an early_pch_init() function
which initializes the BARs, GPIOs, and RCBA configuration. It is also
responsible for reporting back to the caller if the board is being
woken up from S3. The one sequence difference is that the RCBA config
is performed before claling the reference code.

Lastly the rcba configuration was changed to be table driven so that
different board/configurations can use the same code. It should be
possible to have board/configuration specific gpio and rcba
configuration while reusing the romstage code.

Change-Id: I830e41b426261dd686a2701ce054fc39f296dffa
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2681
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 172 insertions, 0 deletions

diff --git a/src/southbridge/intel/lynxpoint/early_pch.c b/src/southbridge/intel/lynxpoint/early_pch.c
new file mode 100644
index 000000000000..d0a583fa1bb0
--- /dev/null
+++ b/src/southbridge/intel/lynxpoint/early_pch.c
@@ -0,0 +1,172 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+
+#include <console/console.h>
+#include <arch/io.h>
+#include <arch/romcc_io.h>
+#include <device/pci_def.h>
+#include <elog.h>
+#include "pch.h"
+
+#if CONFIG_INTEL_LYNXPOINT_LP
+#include "lp_gpio.h"
+#else
+#include "gpio.h"
+#endif
+
+static void pch_enable_bars(void)
+{
+	/* Setting up Southbridge. In the northbridge code. */
+	pci_write_config32(PCH_LPC_DEV, RCBA, DEFAULT_RCBA | 1);
+
+	pci_write_config32(PCH_LPC_DEV, PMBASE, DEFAULT_PMBASE | 1);
+	/* Enable ACPI BAR */
+	pci_write_config8(PCH_LPC_DEV, ACPI_CNTL, 0x80);
+
+	pci_write_config32(PCH_LPC_DEV, GPIO_BASE, DEFAULT_GPIOBASE|1);
+
+	/* Enable GPIO functionality. */
+	pci_write_config8(PCH_LPC_DEV, GPIO_CNTL, 0x10);
+}
+
+static void pch_generic_setup(void)
+{
+	u8 reg8;
+
+	printk(BIOS_DEBUG, "Disabling Watchdog reboot...");
+	RCBA32(GCS) = RCBA32(GCS) | (1 << 5);	/* No reset */
+	outw((1 << 11), DEFAULT_PMBASE | 0x60 | 0x08);	/* halt timer */
+	printk(BIOS_DEBUG, " done.\n");
+
+	// reset rtc power status
+	reg8 = pci_read_config8(PCH_LPC_DEV, GEN_PMCON_3);
+	reg8 &= ~(1 << 2);
+	pci_write_config8(PCH_LPC_DEV, GEN_PMCON_3, reg8);
+}
+
+static int sleep_type_s3(void)
+{
+	u32 pm1_cnt;
+	u16 pm1_sts;
+	int is_s3 = 0;
+
+	/* Check PM1_STS[15] to see if we are waking from Sx */
+	pm1_sts = inw(DEFAULT_PMBASE + PM1_STS);
+	if (pm1_sts & WAK_STS) {
+		/* Read PM1_CNT[12:10] to determine which Sx state */
+		pm1_cnt = inl(DEFAULT_PMBASE + PM1_CNT);
+		if (((pm1_cnt >> 10) & 7) == SLP_TYP_S3) {
+			/* Clear SLP_TYPE. */
+			outl(pm1_cnt & ~(7 << 10), DEFAULT_PMBASE + PM1_CNT);
+			is_s3 = 1;
+		}
+	}
+	return is_s3;
+}
+
+static void pch_enable_lpc(void)
+{
+	device_t dev = PCH_LPC_DEV;
+
+	/* Set COM1/COM2 decode range */
+	pci_write_config16(dev, LPC_IO_DEC, 0x0010);
+
+	/* Enable SuperIO + COM1 + PS/2 Keyboard/Mouse */
+	u16 lpc_config = CNF1_LPC_EN | CNF2_LPC_EN | COMA_LPC_EN | KBC_LPC_EN;
+	pci_write_config16(dev, LPC_EN, lpc_config);
+}
+
+static void pch_config_rcba(const struct rcba_config_instruction *rcba_config)
+{
+	const struct rcba_config_instruction *rc;
+	u32 value;
+
+	rc = rcba_config;
+	while (rc->command != RCBA_COMMAND_END)
+	{
+		if ((rc->command & RCBA_REG_SIZE_MASK) == RCBA_REG_SIZE_16) {
+			switch (rc->command & RCBA_COMMAND_MASK) {
+			case RCBA_COMMAND_SET:
+				RCBA16(rc->reg) = (u16)rc->or_value;
+				break;
+			case RCBA_COMMAND_READ:
+				(void)RCBA16(rc->reg);
+				break;
+			case RCBA_COMMAND_RMW:
+				value = RCBA16(rc->reg);
+				value &= rc->mask;
+				value |= rc->or_value;
+				RCBA16(rc->reg) = (u16)value;
+				break;
+			}
+		} else {
+			switch (rc->command & RCBA_COMMAND_MASK) {
+			case RCBA_COMMAND_SET:
+				RCBA32(rc->reg) = rc->or_value;
+				break;
+			case RCBA_COMMAND_READ:
+				(void)RCBA32(rc->reg);
+				break;
+			case RCBA_COMMAND_RMW:
+				value = RCBA32(rc->reg);
+				value &= rc->mask;
+				value |= rc->or_value;
+				RCBA32(rc->reg) = value;
+				break;
+			}
+		}
+		rc++;
+	}
+}
+
+int early_pch_init(const void *gpio_map,
+                   const struct rcba_config_instruction *rcba_config)
+{
+	int wake_from_s3;
+
+	pch_enable_lpc();
+
+	pch_enable_bars();
+
+#if CONFIG_INTEL_LYNXPOINT_LP
+	setup_pch_lp_gpios(gpio_map);
+#else
+	setup_pch_gpios(gpio_map);
+#endif
+
+	console_init();
+
+	pch_generic_setup();
+
+	/* Enable SMBus for reading SPDs. */
+	enable_smbus();
+
+	pch_config_rcba(rcba_config);
+
+	wake_from_s3 = sleep_type_s3();
+
+#if CONFIG_ELOG_BOOT_COUNT
+	if (!wake_from_s3)
+		boot_count_increment();
+#endif
+
+	/* Report if we are waking from s3. */
+	return wake_from_s3;
+}