baytrail: introduce pattrs

The pattrs structure is intended for the supporting coreboot
code to reference instead of going back to the source of
the values (msrs, cpuid, etc). It essentially serves as a global
structure for collecting attributes about the platform/processor.

Additionally, the implementation provides a point during boot to
hoook work before device enumeration/initialization by providing
a init() function to soc_intel_baytrail_ops that is called before
device work in the boot state machine.

BUG=chrome-os-partner:22862
BUG=chrome-os-partner:22863
BRANCH=None
TEST=Built and booted. Noted pattrs output.

Change-Id: I073da8aca29635146fb0d4a2625b2b7564fd8414
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/170403
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: http://review.coreboot.org/4854
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 107 insertions, 0 deletions

diff --git a/src/soc/intel/baytrail/ramstage.c b/src/soc/intel/baytrail/ramstage.c
new file mode 100644
index 0000000000..e30fc89bc2
--- /dev/null
+++ b/src/soc/intel/baytrail/ramstage.c
@@ -0,0 +1,107 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 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 <arch/cpu.h>
+#include <console/console.h>
+#include <cpu/intel/microcode.h>
+#include <cpu/x86/msr.h>
+#include <device/device.h>
+#include <device/pci_def.h>
+#include <device/pci_ops.h>
+#include <stdlib.h>
+
+#include <baytrail/pattrs.h>
+#include <baytrail/lpc.h>
+#include <baytrail/msr.h>
+#include <baytrail/pci_devs.h>
+#include <baytrail/ramstage.h>
+
+/* Global PATTRS */
+DEFINE_PATTRS;
+
+#define SHOW_PATTRS 1
+
+static void detect_num_cpus(struct pattrs *attrs)
+{
+	int ecx = 0;
+
+	while (1) {
+		struct cpuid_result leaf_b;
+
+		leaf_b = cpuid_ext(0xb, ecx);
+
+		/* Bay Trail doesn't have hyperthreading so just determine the
+		 * number of cores by from level type (ecx[15:8] == * 2). */
+		if ((leaf_b.ecx & 0xff00) == 0x0200) {
+			attrs->num_cpus = leaf_b.ebx & 0xffff;
+			break;
+		}
+		ecx++;
+	}
+}
+
+static inline void fill_in_msr(msr_t *msr, int idx)
+{
+	*msr = rdmsr(idx);
+	if (SHOW_PATTRS) {
+		printk(BIOS_DEBUG, "msr(%x) = %08x%08x\n",
+		       idx, msr->hi, msr->lo);
+	}
+}
+
+static const char *stepping_str[] = { "A0", "A1", "B0", "B1", "B2", "B3" };
+
+static void fill_in_pattrs(void)
+{
+	device_t dev;
+	struct pattrs *attrs = (struct pattrs *)pattrs_get();
+
+	attrs->cpuid = cpuid_eax(1);
+	dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	attrs->revid = pci_read_config8(dev, REVID);
+	/* The revision to stepping IDs have two values per metal stepping. */
+	if (attrs->revid >= RID_B_STEPPING_START) {
+		attrs->stepping = (attrs->revid - RID_B_STEPPING_START) / 2;
+		attrs->stepping += STEP_B0;
+	} else {
+		attrs->stepping = (attrs->revid - RID_A_STEPPING_START) / 2;
+		attrs->stepping += STEP_A0;
+	}
+
+	attrs->microcode_patch = intel_microcode_find();
+	attrs->address_bits = cpuid_eax(0x80000008) & 0xff;
+	detect_num_cpus(attrs);
+
+	if (SHOW_PATTRS) {
+		printk(BIOS_DEBUG, "BYT: cpuid %08x cpus %d rid %02x step %s\n",
+		       attrs->cpuid, attrs->num_cpus, attrs->revid,
+		       (attrs->stepping >= ARRAY_SIZE(stepping_str)) ? "??" :
+		       stepping_str[attrs->stepping]);
+	}
+
+	fill_in_msr(&attrs->platform_id, MSR_IA32_PLATFORM_ID);
+	fill_in_msr(&attrs->platform_info, MSR_PLATFORM_INFO);
+	fill_in_msr(&attrs->iacore_ratios, MSR_IACORE_RATIOS);
+	fill_in_msr(&attrs->iacore_vids, MSR_IACORE_VIDS);
+}
+
+void baytrail_init_pre_device(void)
+{
+	fill_in_pattrs();
+}