tegra: Add warmboot implementation

Add code to set up the warm boot area in the Tegra CPU ready for a
resume after suspend.

Signed-off-by: Yen Lin <yelin@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

1 files changed, 150 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-tegra2/warmboot.h b/arch/arm/include/asm/arch-tegra2/warmboot.h
new file mode 100644
index 0000000..99ac2e7
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra2/warmboot.h
@@ -0,0 +1,150 @@
+/*
+ * (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
+ */
+
+#ifndef _WARM_BOOT_H_
+#define _WARM_BOOT_H_
+
+#define STRAP_OPT_A_RAM_CODE_SHIFT	4
+#define STRAP_OPT_A_RAM_CODE_MASK	(0xf << STRAP_OPT_A_RAM_CODE_SHIFT)
+
+/* Defines the supported operating modes */
+enum fuse_operating_mode {
+	MODE_PRODUCTION = 3,
+	MODE_UNDEFINED,
+};
+
+/* Defines the CMAC-AES-128 hash length in 32 bit words. (128 bits = 4 words) */
+enum {
+	HASH_LENGTH = 4
+};
+
+/* Defines the storage for a hash value (128 bits) */
+struct hash {
+	u32 hash[HASH_LENGTH];
+};
+
+/*
+ * Defines the code header information for the boot rom.
+ *
+ * The code immediately follows the code header.
+ *
+ * Note that the code header needs to be 16 bytes aligned to preserve
+ * the alignment of relevant data for hash and decryption computations without
+ * requiring extra copies to temporary memory areas.
+ */
+struct wb_header {
+	u32 length_insecure;	/* length of the code header */
+	u32 reserved[3];
+	struct hash hash;	/* hash of header+code, starts next field*/
+	struct hash random_aes_block;	/* a data block to aid security. */
+	u32 length_secure;	/* length of the code header */
+	u32 destination;	/* destination address to put the wb code */
+	u32 entry_point;	/* execution address of the wb code */
+	u32 code_length;	/* length of the code */
+};
+
+/*
+ * The warm boot code needs direct access to these registers since it runs in
+ * SRAM and cannot call other U-Boot code.
+ */
+union osc_ctrl_reg {
+	struct {
+		u32 xoe:1;
+		u32 xobp:1;
+		u32 reserved0:2;
+		u32 xofs:6;
+		u32 reserved1:2;
+		u32 xods:5;
+		u32 reserved2:3;
+		u32 oscfi_spare:8;
+		u32 pll_ref_div:2;
+		u32 osc_freq:2;
+	};
+	u32 word;
+};
+
+union pllx_base_reg {
+	struct {
+		u32 divm:5;
+		u32 reserved0:3;
+		u32 divn:10;
+		u32 reserved1:2;
+		u32 divp:3;
+		u32 reserved2:4;
+		u32 lock:1;
+		u32 reserved3:1;
+		u32 ref_dis:1;
+		u32 enable:1;
+		u32 bypass:1;
+	};
+	u32 word;
+};
+
+union pllx_misc_reg {
+	struct {
+		u32 vcocon:4;
+		u32 lfcon:4;
+		u32 cpcon:4;
+		u32 lock_sel:6;
+		u32 reserved0:1;
+		u32 lock_enable:1;
+		u32 reserved1:1;
+		u32 dccon:1;
+		u32 pts:2;
+		u32 reserved2:6;
+		u32 out1_div_byp:1;
+		u32 out1_inv_clk:1;
+	};
+	u32 word;
+};
+
+/*
+ * TODO: This register is not documented in the TRM yet. We could move this
+ * into the EMC and give it a proper interface, but not while it is
+ * undocumented.
+ */
+union scratch3_reg {
+	struct {
+		u32 pllx_base_divm:5;
+		u32 pllx_base_divn:10;
+		u32 pllx_base_divp:3;
+		u32 pllx_misc_lfcon:4;
+		u32 pllx_misc_cpcon:4;
+	};
+	u32 word;
+};
+
+
+/**
+ * Save warmboot memory settings for a later resume
+ *
+ * @return 0 if ok, -1 on error
+ */
+int warmboot_save_sdram_params(void);
+
+int warmboot_prepare_code(u32 seg_address, u32 seg_length);
+int sign_data_block(u8 *source, u32 length, u8 *signature);
+void wb_start(void);	/* Start of WB assembly code */
+void wb_end(void);	/* End of WB assembly code */
+
+#endif