1 files changed, 131 insertions, 0 deletions
diff --git a/arch/arm/cpu/tegra-common/ap.c b/arch/arm/cpu/tegra-common/ap.c
new file mode 100644
index 0000000..c0ca6eb
--- /dev/null
+++ b/arch/arm/cpu/tegra-common/ap.c
@@ -0,0 +1,131 @@
+/*
+* (C) Copyright 2010-2011
+* NVIDIA Corporation <www.nvidia.com>
+*
+* See file CREDITS for list of people who contributed to this
+* project.
+*
+* 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; either version 2 of
+* the License, or (at your option) any later version.
+*
+* 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., 59 Temple Place, Suite 330, Boston,
+* MA 02111-1307 USA
+*/
+#include <asm/io.h>
+#include <asm/arch/ap20.h>
+#include <asm/arch/fuse.h>
+#include <asm/arch/gp_padctrl.h>
+#include <asm/arch/pmc.h>
+#include <asm/arch/scu.h>
+#include <asm/arch/warmboot.h>
+#include <common.h>
+
+int tegra_get_chip_type(void)
+{
+	struct apb_misc_gp_ctlr *gp;
+	struct fuse_regs *fuse = (struct fuse_regs *)NV_PA_FUSE_BASE;
+	uint tegra_sku_id, rev;
+
+	/*
+	 * This is undocumented, Chip ID is bits 15:8 of the register
+	 * APB_MISC + 0x804, and has value 0x20 for Tegra20, 0x30 for
+	 * Tegra30
+	 */
+	gp = (struct apb_misc_gp_ctlr *)NV_PA_APB_MISC_GP_BASE;
+	rev = (readl(&gp->hidrev) & HIDREV_CHIPID_MASK) >> HIDREV_CHIPID_SHIFT;
+
+	tegra_sku_id = readl(&fuse->sku_info) & 0xff;
+
+	switch (rev) {
+	case CHIPID_TEGRA20:
+		switch (tegra_sku_id) {
+		case SKU_ID_T20:
+			return TEGRA_SOC_T20;
+		case SKU_ID_T25SE:
+		case SKU_ID_AP25:
+		case SKU_ID_T25:
+		case SKU_ID_AP25E:
+		case SKU_ID_T25E:
+			return TEGRA_SOC_T25;
+		}
+		break;
+	}
+	/* unknown sku id */
+	return TEGRA_SOC_UNKNOWN;
+}
+
+static void enable_scu(void)
+{
+	struct scu_ctlr *scu = (struct scu_ctlr *)NV_PA_ARM_PERIPHBASE;
+	u32 reg;
+
+	/* If SCU already setup/enabled, return */
+	if (readl(&scu->scu_ctrl) & SCU_CTRL_ENABLE)
+		return;
+
+	/* Invalidate all ways for all processors */
+	writel(0xFFFF, &scu->scu_inv_all);
+
+	/* Enable SCU - bit 0 */
+	reg = readl(&scu->scu_ctrl);
+	reg |= SCU_CTRL_ENABLE;
+	writel(reg, &scu->scu_ctrl);
+}
+
+static u32 get_odmdata(void)
+{
+	/*
+	 * ODMDATA is stored in the BCT in IRAM by the BootROM.
+	 * The BCT start and size are stored in the BIT in IRAM.
+	 * Read the data @ bct_start + (bct_size - 12). This works
+	 * on T20 and T30 BCTs, which are locked down. If this changes
+	 * in new chips (T114, etc.), we can revisit this algorithm.
+	 */
+
+	u32 bct_start, odmdata;
+
+	bct_start = readl(AP20_BASE_PA_SRAM + NVBOOTINFOTABLE_BCTPTR);
+	odmdata = readl(bct_start + BCT_ODMDATA_OFFSET);
+
+	return odmdata;
+}
+
+static void init_pmc_scratch(void)
+{
+	struct pmc_ctlr *const pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
+	u32 odmdata;
+	int i;
+
+	/* SCRATCH0 is initialized by the boot ROM and shouldn't be cleared */
+	for (i = 0; i < 23; i++)
+		writel(0, &pmc->pmc_scratch1+i);
+
+	/* ODMDATA is for kernel use to determine RAM size, LP config, etc. */
+	odmdata = get_odmdata();
+	writel(odmdata, &pmc->pmc_scratch20);
+}
+
+void s_init(void)
+{
+	/* Init PMC scratch memory */
+	init_pmc_scratch();
+
+	enable_scu();
+
+	/* enable SMP mode and FW for CPU0, by writing to Auxiliary Ctl reg */
+	asm volatile(
+		"mrc	p15, 0, r0, c1, c0, 1\n"
+		"orr	r0, r0, #0x41\n"
+		"mcr	p15, 0, r0, c1, c0, 1\n");
+
+	/* FIXME: should have ap20's L2 disabled too? */
+}