116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/*
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* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/io.h>
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#include <soc/tegra/fuse.h>
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#include "fuse.h"
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#define APBMISC_BASE 0x70000800
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#define APBMISC_SIZE 0x64
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#define FUSE_SKU_INFO 0x10
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static void __iomem *apbmisc_base;
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static void __iomem *strapping_base;
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u32 tegra_read_chipid(void)
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{
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return readl_relaxed(apbmisc_base + 4);
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}
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u8 tegra_get_chip_id(void)
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{
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if (!apbmisc_base) {
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WARN(1, "Tegra Chip ID not yet available\n");
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return 0;
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}
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return (tegra_read_chipid() >> 8) & 0xff;
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}
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u32 tegra_read_straps(void)
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{
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if (strapping_base)
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return readl_relaxed(strapping_base);
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else
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return 0;
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}
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static const struct of_device_id apbmisc_match[] __initconst = {
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{ .compatible = "nvidia,tegra20-apbmisc", },
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{},
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};
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void __init tegra_init_revision(void)
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{
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u32 id, chip_id, minor_rev;
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int rev;
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id = tegra_read_chipid();
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chip_id = (id >> 8) & 0xff;
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minor_rev = (id >> 16) & 0xf;
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switch (minor_rev) {
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case 1:
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rev = TEGRA_REVISION_A01;
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break;
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case 2:
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rev = TEGRA_REVISION_A02;
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break;
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case 3:
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if (chip_id == TEGRA20 && (tegra20_spare_fuse_early(18) ||
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tegra20_spare_fuse_early(19)))
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rev = TEGRA_REVISION_A03p;
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else
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rev = TEGRA_REVISION_A03;
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break;
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case 4:
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rev = TEGRA_REVISION_A04;
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break;
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default:
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rev = TEGRA_REVISION_UNKNOWN;
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}
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tegra_sku_info.revision = rev;
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if (chip_id == TEGRA20)
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tegra_sku_info.sku_id = tegra20_fuse_early(FUSE_SKU_INFO);
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else
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tegra_sku_info.sku_id = tegra30_fuse_readl(FUSE_SKU_INFO);
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}
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void __init tegra_init_apbmisc(void)
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{
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struct device_node *np;
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np = of_find_matching_node(NULL, apbmisc_match);
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apbmisc_base = of_iomap(np, 0);
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if (!apbmisc_base) {
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pr_warn("ioremap tegra apbmisc failed. using %08x instead\n",
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APBMISC_BASE);
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apbmisc_base = ioremap(APBMISC_BASE, APBMISC_SIZE);
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}
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strapping_base = of_iomap(np, 1);
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if (!strapping_base)
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pr_err("ioremap tegra strapping_base failed\n");
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}
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