intel/common/block/i2c: Add common block for I2C and use the same in SoCs

In the intel/common/block
* Move I2C common code from intel/common to intel/common/block.
* Split the code into common, early init and post mem init stages and put it
  in lpss_i2c.c, i2c_early.c and i2c.c respectively.
* Declare functions for getting platform specific i2c bus config and
  mapping bus to devfn and vice versa, that have to be implemented by SoC.

In skylake/apollolake
* Stop using code from soc/intel/common/lpss_i2c.c.
* Remove early i2c initialization code from bootblock.
* Refactor i2c.c file to implement SoC specific methods
  required by the I2C IP block.

Change-Id: I4d91a04c22e181e3a995112cce6d5f0324130b81
Signed-off-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Reviewed-on: https://review.coreboot.org/19468
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

2 files changed, 2 insertions, 92 deletions

diff --git a/src/soc/intel/skylake/bootblock/bootblock.c b/src/soc/intel/skylake/bootblock/bootblock.c
index f386f96360..cbe3dd2fdc 100644
--- a/src/soc/intel/skylake/bootblock/bootblock.c
+++ b/src/soc/intel/skylake/bootblock/bootblock.c
@@ -15,6 +15,7 @@
 
 #include <bootblock_common.h>
 #include <intelblocks/gspi.h>
+#include <intelblocks/lpss_i2c.h>
 #include <soc/bootblock.h>
 
 asmlinkage void bootblock_c_entry(uint64_t base_timestamp)
@@ -48,6 +49,6 @@ void bootblock_soc_init(void)
 	report_platform_info();
 	set_max_freq();
 	pch_early_init();
-	i2c_early_init();
+
 	gspi_early_bar_init();
 }
diff --git a/src/soc/intel/skylake/bootblock/i2c.c b/src/soc/intel/skylake/bootblock/i2c.c
deleted file mode 100644
index f8859a4607..0000000000
--- a/src/soc/intel/skylake/bootblock/i2c.c
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright 2016 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.
- */
-
-#include <arch/io.h>
-#include <commonlib/helpers.h>
-#include <device/device.h>
-#include <device/i2c.h>
-#include <device/pci_def.h>
-#include <intelblocks/lpss.h>
-#include <soc/intel/common/lpss_i2c.h>
-#include <soc/iomap.h>
-#include <soc/pci_devs.h>
-#include <soc/bootblock.h>
-#include "chip.h"
-
-uintptr_t lpss_i2c_base_address(unsigned int bus)
-{
-	int devfn;
-	pci_devfn_t dev;
-
-	/* Find device+function for this controller */
-	devfn = i2c_bus_to_devfn(bus);
-	if (devfn < 0)
-		return 0;
-
-	/* Form a PCI address for this device */
-	dev = PCI_DEV(0, PCI_SLOT(devfn), PCI_FUNC(devfn));
-
-	/* Read the first base address for this device */
-	return ALIGN_DOWN(pci_read_config32(dev, PCI_BASE_ADDRESS_0), 16);
-}
-
-static void i2c_early_init_bus(unsigned int bus)
-{
-	DEVTREE_CONST struct soc_intel_skylake_config *config;
-	DEVTREE_CONST struct device *tree_dev;
-	pci_devfn_t dev;
-	int devfn;
-	uintptr_t base;
-
-	/* Find the PCI device for this bus controller */
-	devfn = i2c_bus_to_devfn(bus);
-	if (devfn < 0)
-		return;
-
-	/* Look up the controller device in the devicetree */
-	dev = PCI_DEV(0, PCI_SLOT(devfn), PCI_FUNC(devfn));
-	tree_dev = dev_find_slot(0, devfn);
-	if (!tree_dev || !tree_dev->enabled)
-		return;
-
-	/* Skip if not enabled for early init */
-	config = tree_dev->chip_info;
-	if (!config)
-		return;
-	if (!config->i2c[bus].early_init)
-		return;
-
-	/* Prepare early base address for access before memory */
-	base = EARLY_I2C_BASE(bus);
-	pci_write_config32(dev, PCI_BASE_ADDRESS_0, base);
-	pci_write_config32(dev, PCI_COMMAND,
-			   PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
-
-	/* Take device out of reset */
-	lpss_reset_release(base);
-
-	/* Initialize the controller */
-	lpss_i2c_init(bus, &config->i2c[bus]);
-}
-
-void i2c_early_init(void)
-{
-	int bus;
-
-	/* Initialize I2C controllers that are enabled in devicetree */
-	for (bus = 0; bus < SKYLAKE_I2C_DEV_MAX; bus++)
-		i2c_early_init_bus(bus);
-}