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Diffstat (limited to 'roms/u-boot/arch/x86/cpu/baytrail/cpu.c')
-rw-r--r--roms/u-boot/arch/x86/cpu/baytrail/cpu.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/roms/u-boot/arch/x86/cpu/baytrail/cpu.c b/roms/u-boot/arch/x86/cpu/baytrail/cpu.c
new file mode 100644
index 000000000..309a50a11
--- /dev/null
+++ b/roms/u-boot/arch/x86/cpu/baytrail/cpu.c
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015 Google, Inc
+ *
+ * Based on code from coreboot
+ */
+
+#include <common.h>
+#include <cpu.h>
+#include <dm.h>
+#include <init.h>
+#include <log.h>
+#include <pci.h>
+#include <asm/cpu.h>
+#include <asm/cpu_x86.h>
+#include <asm/io.h>
+#include <asm/lapic.h>
+#include <asm/msr.h>
+#include <asm/turbo.h>
+
+#define BYT_PRV_CLK 0x800
+#define BYT_PRV_CLK_EN (1 << 0)
+#define BYT_PRV_CLK_M_VAL_SHIFT 1
+#define BYT_PRV_CLK_N_VAL_SHIFT 16
+#define BYT_PRV_CLK_UPDATE (1 << 31)
+
+static void hsuart_clock_set(void *base)
+{
+ u32 m, n, reg;
+
+ /*
+ * Configure the BayTrail UART clock for the internal HS UARTs
+ * (PCI devices) to 58982400 Hz
+ */
+ m = 0x2400;
+ n = 0x3d09;
+ reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT);
+ writel(reg, base + BYT_PRV_CLK);
+ reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE;
+ writel(reg, base + BYT_PRV_CLK);
+}
+
+/*
+ * Configure the internal clock of both SIO HS-UARTs, if they are enabled
+ * via FSP
+ */
+int arch_cpu_init_dm(void)
+{
+ struct udevice *dev;
+ void *base;
+ int ret;
+ int i;
+
+ /* Loop over the 2 HS-UARTs */
+ for (i = 0; i < 2; i++) {
+ ret = dm_pci_bus_find_bdf(PCI_BDF(0, 0x1e, 3 + i), &dev);
+ if (!ret) {
+ base = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0,
+ PCI_REGION_MEM);
+ hsuart_clock_set(base);
+ }
+ }
+
+ return 0;
+}
+
+static void set_max_freq(void)
+{
+ msr_t perf_ctl;
+ msr_t msr;
+
+ /* Enable speed step */
+ msr = msr_read(MSR_IA32_MISC_ENABLE);
+ msr.lo |= MISC_ENABLE_ENHANCED_SPEEDSTEP;
+ msr_write(MSR_IA32_MISC_ENABLE, msr);
+
+ /*
+ * Set guaranteed ratio [21:16] from IACORE_RATIOS to bits [15:8] of
+ * the PERF_CTL
+ */
+ msr = msr_read(MSR_IACORE_RATIOS);
+ perf_ctl.lo = (msr.lo & 0x3f0000) >> 8;
+
+ /*
+ * Set guaranteed vid [22:16] from IACORE_VIDS to bits [7:0] of
+ * the PERF_CTL
+ */
+ msr = msr_read(MSR_IACORE_VIDS);
+ perf_ctl.lo |= (msr.lo & 0x7f0000) >> 16;
+ perf_ctl.hi = 0;
+
+ msr_write(MSR_IA32_PERF_CTL, perf_ctl);
+}
+
+static int cpu_x86_baytrail_probe(struct udevice *dev)
+{
+ if (!ll_boot_init())
+ return 0;
+ debug("Init BayTrail core\n");
+
+ /*
+ * On BayTrail the turbo disable bit is actually scoped at the
+ * building-block level, not package. For non-BSP cores that are
+ * within a building block, enable turbo. The cores within the BSP's
+ * building block will just see it already enabled and move on.
+ */
+ if (lapicid())
+ turbo_enable();
+
+ /* Dynamic L2 shrink enable and threshold */
+ msr_clrsetbits_64(MSR_PMG_CST_CONFIG_CONTROL, 0x3f000f, 0xe0008),
+
+ /* Disable C1E */
+ msr_clrsetbits_64(MSR_POWER_CTL, 2, 0);
+ msr_setbits_64(MSR_POWER_MISC, 0x44);
+
+ /* Set this core to max frequency ratio */
+ set_max_freq();
+
+ return 0;
+}
+
+static unsigned bus_freq(void)
+{
+ msr_t clk_info = msr_read(MSR_BSEL_CR_OVERCLOCK_CONTROL);
+ switch (clk_info.lo & 0x3) {
+ case 0:
+ return 83333333;
+ case 1:
+ return 100000000;
+ case 2:
+ return 133333333;
+ case 3:
+ return 116666666;
+ default:
+ return 0;
+ }
+}
+
+static unsigned long tsc_freq(void)
+{
+ msr_t platform_info;
+ ulong bclk = bus_freq();
+
+ if (!bclk)
+ return 0;
+
+ platform_info = msr_read(MSR_PLATFORM_INFO);
+
+ return bclk * ((platform_info.lo >> 8) & 0xff);
+}
+
+static int baytrail_get_info(const struct udevice *dev, struct cpu_info *info)
+{
+ info->cpu_freq = tsc_freq();
+ info->features = 1 << CPU_FEAT_L1_CACHE | 1 << CPU_FEAT_MMU;
+
+ return 0;
+}
+
+static int baytrail_get_count(const struct udevice *dev)
+{
+ int ecx = 0;
+
+ /*
+ * Use the algorithm described in Intel 64 and IA-32 Architectures
+ * Software Developer's Manual Volume 3 (3A, 3B & 3C): System
+ * Programming Guide, Jan-2015. Section 8.9.2: Hierarchical Mapping
+ * of CPUID Extended Topology Leaf.
+ */
+ 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)
+ return leaf_b.ebx & 0xffff;
+
+ ecx++;
+ }
+
+ return 0;
+}
+
+static const struct cpu_ops cpu_x86_baytrail_ops = {
+ .get_desc = cpu_x86_get_desc,
+ .get_info = baytrail_get_info,
+ .get_count = baytrail_get_count,
+ .get_vendor = cpu_x86_get_vendor,
+};
+
+static const struct udevice_id cpu_x86_baytrail_ids[] = {
+ { .compatible = "intel,baytrail-cpu" },
+ { }
+};
+
+U_BOOT_DRIVER(cpu_x86_baytrail_drv) = {
+ .name = "cpu_x86_baytrail",
+ .id = UCLASS_CPU,
+ .of_match = cpu_x86_baytrail_ids,
+ .bind = cpu_x86_bind,
+ .probe = cpu_x86_baytrail_probe,
+ .ops = &cpu_x86_baytrail_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};