soc/tegra: Add efuse driver for Tegra

Implement fuse driver for Tegra20, Tegra30, Tegra114 and Tegra124. This
replaces functionality previously provided in arch/arm/mach-tegra, which
is removed in this patch.

While at it, move the only user of the global tegra_revision variable
over to tegra_sku_info.revision and export tegra_fuse_readl() to allow
drivers to read calibration fuses.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 0 insertions, 260 deletions

diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c
deleted file mode 100644
index b22e76a40965..000000000000
--- a/arch/arm/mach-tegra/fuse.c
+++ /dev/null
@@ -1,260 +0,0 @@
-/*
- * arch/arm/mach-tegra/fuse.c
- *
- * Copyright (C) 2010 Google, Inc.
- * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
- *
- * Author:
- *	Colin Cross <ccross@android.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * 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 <linux/clk.h>
-#include <linux/export.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/random.h>
-
-#include <soc/tegra/fuse.h>
-
-#include "apbio.h"
-#include "fuse.h"
-#include "iomap.h"
-
-/* Tegra20 only */
-#define FUSE_UID_LOW		0x108
-#define FUSE_UID_HIGH		0x10c
-
-/* Tegra30 and later */
-#define FUSE_VENDOR_CODE	0x200
-#define FUSE_FAB_CODE		0x204
-#define FUSE_LOT_CODE_0		0x208
-#define FUSE_LOT_CODE_1		0x20c
-#define FUSE_WAFER_ID		0x210
-#define FUSE_X_COORDINATE	0x214
-#define FUSE_Y_COORDINATE	0x218
-
-#define FUSE_SKU_INFO		0x110
-
-#define TEGRA20_FUSE_SPARE_BIT		0x200
-#define TEGRA30_FUSE_SPARE_BIT		0x244
-
-int tegra_sku_id;
-int tegra_cpu_process_id;
-int tegra_core_process_id;
-int tegra_cpu_speedo_id;		/* only exist in Tegra30 and later */
-int tegra_soc_speedo_id;
-enum tegra_revision tegra_revision;
-
-static struct clk *fuse_clk;
-static int tegra_fuse_spare_bit;
-static void (*tegra_init_speedo_data)(void);
-
-/* The BCT to use at boot is specified by board straps that can be read
- * through a APB misc register and decoded. 2 bits, i.e. 4 possible BCTs.
- */
-int tegra_bct_strapping;
-
-#define STRAP_OPT 0x008
-#define GMI_AD0 (1 << 4)
-#define GMI_AD1 (1 << 5)
-#define RAM_ID_MASK (GMI_AD0 | GMI_AD1)
-#define RAM_CODE_SHIFT 4
-
-static const char *tegra_revision_name[TEGRA_REVISION_MAX] = {
-	[TEGRA_REVISION_UNKNOWN] = "unknown",
-	[TEGRA_REVISION_A01]     = "A01",
-	[TEGRA_REVISION_A02]     = "A02",
-	[TEGRA_REVISION_A03]     = "A03",
-	[TEGRA_REVISION_A03p]    = "A03 prime",
-	[TEGRA_REVISION_A04]     = "A04",
-};
-
-static void tegra_fuse_enable_clk(void)
-{
-	if (IS_ERR(fuse_clk))
-		fuse_clk = clk_get_sys(NULL, "fuse");
-	if (IS_ERR(fuse_clk))
-		return;
-	clk_prepare_enable(fuse_clk);
-}
-
-static void tegra_fuse_disable_clk(void)
-{
-	if (IS_ERR(fuse_clk))
-		return;
-	clk_disable_unprepare(fuse_clk);
-}
-
-u32 tegra_fuse_readl(unsigned long offset)
-{
-	return tegra_apb_readl(TEGRA_FUSE_BASE + offset);
-}
-
-bool tegra_spare_fuse(int bit)
-{
-	bool ret;
-
-	tegra_fuse_enable_clk();
-
-	ret = tegra_fuse_readl(tegra_fuse_spare_bit + bit * 4);
-
-	tegra_fuse_disable_clk();
-
-	return ret;
-}
-
-static enum tegra_revision tegra_get_revision(u32 id)
-{
-	u32 minor_rev = (id >> 16) & 0xf;
-
-	switch (minor_rev) {
-	case 1:
-		return TEGRA_REVISION_A01;
-	case 2:
-		return TEGRA_REVISION_A02;
-	case 3:
-		if (tegra_get_chip_id() == TEGRA20 &&
-			(tegra_spare_fuse(18) || tegra_spare_fuse(19)))
-			return TEGRA_REVISION_A03p;
-		else
-			return TEGRA_REVISION_A03;
-	case 4:
-		return TEGRA_REVISION_A04;
-	default:
-		return TEGRA_REVISION_UNKNOWN;
-	}
-}
-
-static void tegra_get_process_id(void)
-{
-	u32 reg;
-
-	tegra_fuse_enable_clk();
-
-	reg = tegra_fuse_readl(tegra_fuse_spare_bit);
-	tegra_cpu_process_id = (reg >> 6) & 3;
-	reg = tegra_fuse_readl(tegra_fuse_spare_bit);
-	tegra_core_process_id = (reg >> 12) & 3;
-
-	tegra_fuse_disable_clk();
-}
-
-u32 tegra_read_chipid(void)
-{
-	return readl_relaxed(IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804);
-}
-
-u8 tegra_get_chip_id(void)
-{
-	u32 id = tegra_read_chipid();
-
-	return (id >> 8) & 0xff;
-}
-
-static void __init tegra20_fuse_init_randomness(void)
-{
-	u32 randomness[2];
-
-	randomness[0] = tegra_fuse_readl(FUSE_UID_LOW);
-	randomness[1] = tegra_fuse_readl(FUSE_UID_HIGH);
-
-	add_device_randomness(randomness, sizeof(randomness));
-}
-
-/* Applies to Tegra30 or later */
-static void __init tegra30_fuse_init_randomness(void)
-{
-	u32 randomness[7];
-
-	randomness[0] = tegra_fuse_readl(FUSE_VENDOR_CODE);
-	randomness[1] = tegra_fuse_readl(FUSE_FAB_CODE);
-	randomness[2] = tegra_fuse_readl(FUSE_LOT_CODE_0);
-	randomness[3] = tegra_fuse_readl(FUSE_LOT_CODE_1);
-	randomness[4] = tegra_fuse_readl(FUSE_WAFER_ID);
-	randomness[5] = tegra_fuse_readl(FUSE_X_COORDINATE);
-	randomness[6] = tegra_fuse_readl(FUSE_Y_COORDINATE);
-
-	add_device_randomness(randomness, sizeof(randomness));
-}
-
-void __init tegra_init_fuse(void)
-{
-	u32 id;
-	u32 randomness[5];
-	u8 chip_id;
-
-	u32 reg = readl(IO_ADDRESS(TEGRA_CLK_RESET_BASE + 0x48));
-	reg |= 1 << 28;
-	writel(reg, IO_ADDRESS(TEGRA_CLK_RESET_BASE + 0x48));
-
-	/*
-	 * Enable FUSE clock. This needs to be hardcoded because the clock
-	 * subsystem is not active during early boot.
-	 */
-	reg = readl(IO_ADDRESS(TEGRA_CLK_RESET_BASE + 0x14));
-	reg |= 1 << 7;
-	writel(reg, IO_ADDRESS(TEGRA_CLK_RESET_BASE + 0x14));
-	fuse_clk = ERR_PTR(-EINVAL);
-
-	reg = tegra_fuse_readl(FUSE_SKU_INFO);
-	randomness[0] = reg;
-	tegra_sku_id = reg & 0xFF;
-
-	reg = tegra_apb_readl(TEGRA_APB_MISC_BASE + STRAP_OPT);
-	randomness[1] = reg;
-	tegra_bct_strapping = (reg & RAM_ID_MASK) >> RAM_CODE_SHIFT;
-
-	id = tegra_read_chipid();
-	randomness[2] = id;
-	chip_id = (id >> 8) & 0xff;
-
-	switch (chip_id) {
-	case TEGRA20:
-		tegra_fuse_spare_bit = TEGRA20_FUSE_SPARE_BIT;
-		tegra_init_speedo_data = &tegra20_init_speedo_data;
-		break;
-	case TEGRA30:
-		tegra_fuse_spare_bit = TEGRA30_FUSE_SPARE_BIT;
-		tegra_init_speedo_data = &tegra30_init_speedo_data;
-		break;
-	case TEGRA114:
-		tegra_init_speedo_data = &tegra114_init_speedo_data;
-		break;
-	default:
-		pr_warn("Tegra: unknown chip id %d\n", chip_id);
-		tegra_fuse_spare_bit = TEGRA20_FUSE_SPARE_BIT;
-		tegra_init_speedo_data = &tegra_get_process_id;
-	}
-
-	tegra_revision = tegra_get_revision(id);
-	tegra_init_speedo_data();
-	randomness[3] = (tegra_cpu_process_id << 16) | tegra_core_process_id;
-	randomness[4] = (tegra_cpu_speedo_id << 16) | tegra_soc_speedo_id;
-
-	add_device_randomness(randomness, sizeof(randomness));
-	switch (chip_id) {
-	case TEGRA20:
-		tegra20_fuse_init_randomness();
-		break;
-	case TEGRA30:
-	case TEGRA114:
-	default:
-		tegra30_fuse_init_randomness();
-		break;
-	}
-
-	pr_info("Tegra Revision: %s SKU: %d CPU Process: %d Core Process: %d\n",
-		tegra_revision_name[tegra_revision],
-		tegra_sku_id, tegra_cpu_process_id,
-		tegra_core_process_id);
-}