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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/io.h>
#include <soc/tegra/fuse.h>
#include <soc/tegra/common.h>
#include "fuse.h"
#define FUSE_SKU_INFO 0x10
#define PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT 4
#define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG \
(0xf << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT)
#define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT \
(0x3 << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT)
static bool long_ram_code;
static u32 strapping;
static u32 chipid;
u32 tegra_read_chipid(void)
{
WARN(!chipid, "Tegra APB MISC not yet available\n");
return chipid;
}
u8 tegra_get_chip_id(void)
{
return (tegra_read_chipid() >> 8) & 0xff;
}
u8 tegra_get_major_rev(void)
{
return (tegra_read_chipid() >> 4) & 0xf;
}
u8 tegra_get_minor_rev(void)
{
return (tegra_read_chipid() >> 16) & 0xf;
}
u8 tegra_get_platform(void)
{
return (tegra_read_chipid() >> 20) & 0xf;
}
bool tegra_is_silicon(void)
{
switch (tegra_get_chip_id()) {
case TEGRA194:
case TEGRA234:
if (tegra_get_platform() == 0)
return true;
return false;
}
/*
* Chips prior to Tegra194 have a different way of determining whether
* they are silicon or not. Since we never supported simulation on the
* older Tegra chips, don't bother extracting the information and just
* report that we're running on silicon.
*/
return true;
}
u32 tegra_read_straps(void)
{
WARN(!chipid, "Tegra ABP MISC not yet available\n");
return strapping;
}
u32 tegra_read_ram_code(void)
{
u32 straps = tegra_read_straps();
if (long_ram_code)
straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG;
else
straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT;
return straps >> PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT;
}
EXPORT_SYMBOL_GPL(tegra_read_ram_code);
static const struct of_device_id apbmisc_match[] __initconst = {
{ .compatible = "nvidia,tegra20-apbmisc", },
{ .compatible = "nvidia,tegra186-misc", },
{ .compatible = "nvidia,tegra194-misc", },
{ .compatible = "nvidia,tegra234-misc", },
{},
};
void __init tegra_init_revision(void)
{
u8 chip_id, minor_rev;
chip_id = tegra_get_chip_id();
minor_rev = tegra_get_minor_rev();
switch (minor_rev) {
case 1:
tegra_sku_info.revision = TEGRA_REVISION_A01;
break;
case 2:
tegra_sku_info.revision = TEGRA_REVISION_A02;
break;
case 3:
if (chip_id == TEGRA20 && (tegra_fuse_read_spare(18) ||
tegra_fuse_read_spare(19)))
tegra_sku_info.revision = TEGRA_REVISION_A03p;
else
tegra_sku_info.revision = TEGRA_REVISION_A03;
break;
case 4:
tegra_sku_info.revision = TEGRA_REVISION_A04;
break;
default:
tegra_sku_info.revision = TEGRA_REVISION_UNKNOWN;
}
tegra_sku_info.sku_id = tegra_fuse_read_early(FUSE_SKU_INFO);
}
void __init tegra_init_apbmisc(void)
{
void __iomem *apbmisc_base, *strapping_base;
struct resource apbmisc, straps;
struct device_node *np;
np = of_find_matching_node(NULL, apbmisc_match);
if (!np) {
/*
* Fall back to legacy initialization for 32-bit ARM only. All
* 64-bit ARM device tree files for Tegra are required to have
* an APBMISC node.
*
* This is for backwards-compatibility with old device trees
* that didn't contain an APBMISC node.
*/
if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) {
/* APBMISC registers (chip revision, ...) */
apbmisc.start = 0x70000800;
apbmisc.end = 0x70000863;
apbmisc.flags = IORESOURCE_MEM;
/* strapping options */
if (of_machine_is_compatible("nvidia,tegra124")) {
straps.start = 0x7000e864;
straps.end = 0x7000e867;
} else {
straps.start = 0x70000008;
straps.end = 0x7000000b;
}
straps.flags = IORESOURCE_MEM;
pr_warn("Using APBMISC region %pR\n", &apbmisc);
pr_warn("Using strapping options registers %pR\n",
&straps);
} else {
/*
* At this point we're not running on Tegra, so play
* nice with multi-platform kernels.
*/
return;
}
} else {
/*
* Extract information from the device tree if we've found a
* matching node.
*/
if (of_address_to_resource(np, 0, &apbmisc) < 0) {
pr_err("failed to get APBMISC registers\n");
return;
}
if (of_address_to_resource(np, 1, &straps) < 0) {
pr_err("failed to get strapping options registers\n");
return;
}
}
apbmisc_base = ioremap(apbmisc.start, resource_size(&apbmisc));
if (!apbmisc_base) {
pr_err("failed to map APBMISC registers\n");
} else {
chipid = readl_relaxed(apbmisc_base + 4);
iounmap(apbmisc_base);
}
strapping_base = ioremap(straps.start, resource_size(&straps));
if (!strapping_base) {
pr_err("failed to map strapping options registers\n");
} else {
strapping = readl_relaxed(strapping_base);
iounmap(strapping_base);
}
long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code");
}
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