New patch to review for coreboot: soc/intel/skylake: Fix SATA booting to OS issue.

[Subrata Banik]

Subrata Banik ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17229

-gerrit

commit 496b60c93619526ac58332a636cb870f8b7307ff
Author: Subrata Banik 
Date:   Fri Nov 4 13:26:41 2016 +0530

soc/intel/skylake: Fix SATA booting to OS issue.

SATA device remain unrecognized if connected at Port 2.

Port control and Status register(PCS) by default set by
    hardware to the disabled state as a result of an initial
    power on reset. The same read by OS during booting causes
    disabling of SATA ports and can't detect any devices.

BRANCH=none
    BUG=chrome-os-partner:59335
    TEST=Build and boot SKL from SATA device connected at Port 2.

Change-Id: I4866ca44567f5024edaca2d48098af5b4c67a7ac
    Signed-off-by: Subrata Banik 
---
 src/soc/intel/skylake/Makefile.inc |  1 +
 src/soc/intel/skylake/sata.c       | 70 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+)

diff --git a/src/soc/intel/skylake/Makefile.inc b/src/soc/intel/skylake/Makefile.inc
index 32eb708..f02f956 100644
--- a/src/soc/intel/skylake/Makefile.inc
+++ b/src/soc/intel/skylake/Makefile.inc
@@ -73,6 +73,7 @@ ramstage-y += pei_data.c
 ramstage-y += pmc.c
 ramstage-y += pmutil.c
 ramstage-$(CONFIG_PLATFORM_USES_FSP2_0) += reset.c
+ramstage-y += sata.c
 ramstage-y += sd.c
 ramstage-y += smbus.c
 ramstage-y += smbus_common.c
diff --git a/src/soc/intel/skylake/sata.c b/src/soc/intel/skylake/sata.c
new file mode 100644
index 0000000..7269a95
--- /dev/null
+++ b/src/soc/intel/skylake/sata.c
@@ -0,0 +1,70 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Intel Corporation.
+ *
+ * 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 <device/device.h>
+#include <device/pci.h>
+#include <device/pci_def.h>
+#include <device/pci_ids.h>
+#include <soc/ramstage.h>
+
+static void *get_ahci_bar(void)
+{
+	device_t dev = PCH_DEV_SATA;
+	uint32_t bar;
+
+	bar = pci_read_config32(dev, PCI_BASE_ADDRESS_5);
+
+	return (void *)(bar & ~PCI_BASE_ADDRESS_MEM_ATTR_MASK);
+}
+
+/*
+ * SATA Port control and Status. Byu default, the SATA ports are set (by HW)
+ * to the disabled state (e.g. bits[3:0] == '0') as a result of an initial
+ * power on reset. When enabled by software as per SATA port mapping,
+ * the ports can transition between the on, partial and can detect devices.
+ */
+static void sata_final(device_t dev)
+{
+	void *ahcibar = get_ahci_bar();
+	u8 port_impl;
+
+	dev = PCH_DEV_SATA;
+	/* Read Ports Implemented (GHC_PI) */
+	port_impl = read32(ahcibar + 0x0c);
+	port_impl = ~port_impl & 0x07;
+	/* Port enable */
+	pci_write_config8(dev, 0x92, port_impl);
+}
+
+static struct device_operations sata_ops = {
+	.read_resources			= &pci_dev_read_resources,
+	.set_resources			= &pci_dev_set_resources,
+	.enable_resources		= &pci_dev_enable_resources,
+	.final			= sata_final,
+	.ops_pci			= &soc_pci_ops,
+};
+
+static const unsigned short pci_device_ids[] = {
+	0x9d03, /* SKL-U Base */
+	0x9d07, /* SKL-Y Premium, SKL-U Premium */
+	0xa282, /* KBL */
+	0
+};
+
+static const struct pci_driver pch_sata __pci_driver = {
+	.ops	 = &sata_ops,
+	.vendor	 = PCI_VENDOR_ID_INTEL,
+	.devices = pci_device_ids,
+};