| /* |
| * Copyright (c) 2013-2014, NVIDIA CORPORATION. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/kobject.h> |
| #include <linux/kernel.h> |
| #include <linux/platform_device.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/io.h> |
| |
| #include <soc/tegra/common.h> |
| #include <soc/tegra/fuse.h> |
| |
| #include "fuse.h" |
| |
| static u32 (*fuse_readl)(const unsigned int offset); |
| static int fuse_size; |
| struct tegra_sku_info tegra_sku_info; |
| |
| 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 u8 fuse_readb(const unsigned int offset) |
| { |
| u32 val; |
| |
| val = fuse_readl(round_down(offset, 4)); |
| val >>= (offset % 4) * 8; |
| val &= 0xff; |
| |
| return val; |
| } |
| |
| static ssize_t fuse_read(struct file *fd, struct kobject *kobj, |
| struct bin_attribute *attr, char *buf, |
| loff_t pos, size_t size) |
| { |
| int i; |
| |
| if (pos < 0 || pos >= fuse_size) |
| return 0; |
| |
| if (size > fuse_size - pos) |
| size = fuse_size - pos; |
| |
| for (i = 0; i < size; i++) |
| buf[i] = fuse_readb(pos + i); |
| |
| return i; |
| } |
| |
| static struct bin_attribute fuse_bin_attr = { |
| .attr = { .name = "fuse", .mode = S_IRUGO, }, |
| .read = fuse_read, |
| }; |
| |
| static const struct of_device_id car_match[] __initconst = { |
| { .compatible = "nvidia,tegra20-car", }, |
| { .compatible = "nvidia,tegra30-car", }, |
| { .compatible = "nvidia,tegra114-car", }, |
| { .compatible = "nvidia,tegra124-car", }, |
| {}, |
| }; |
| |
| static void tegra_enable_fuse_clk(void __iomem *base) |
| { |
| u32 reg; |
| |
| reg = readl_relaxed(base + 0x48); |
| reg |= 1 << 28; |
| writel(reg, base + 0x48); |
| |
| /* |
| * Enable FUSE clock. This needs to be hardcoded because the clock |
| * subsystem is not active during early boot. |
| */ |
| reg = readl(base + 0x14); |
| reg |= 1 << 7; |
| writel(reg, base + 0x14); |
| } |
| |
| int tegra_fuse_readl(unsigned long offset, u32 *value) |
| { |
| if (!fuse_readl) |
| return -EPROBE_DEFER; |
| |
| *value = fuse_readl(offset); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(tegra_fuse_readl); |
| |
| int tegra_fuse_create_sysfs(struct device *dev, int size, |
| u32 (*readl)(const unsigned int offset)) |
| { |
| if (fuse_size) |
| return -ENODEV; |
| |
| fuse_bin_attr.size = size; |
| fuse_bin_attr.read = fuse_read; |
| |
| fuse_size = size; |
| fuse_readl = readl; |
| |
| return device_create_bin_file(dev, &fuse_bin_attr); |
| } |
| |
| static int __init tegra_init_fuse(void) |
| { |
| struct device_node *np; |
| void __iomem *car_base; |
| |
| if (!soc_is_tegra()) |
| return 0; |
| |
| tegra_init_apbmisc(); |
| |
| np = of_find_matching_node(NULL, car_match); |
| car_base = of_iomap(np, 0); |
| if (car_base) { |
| tegra_enable_fuse_clk(car_base); |
| iounmap(car_base); |
| } else { |
| pr_err("Could not enable fuse clk. ioremap tegra car failed.\n"); |
| return -ENXIO; |
| } |
| |
| if (tegra_get_chip_id() == TEGRA20) |
| tegra20_init_fuse_early(); |
| else |
| tegra30_init_fuse_early(); |
| |
| pr_info("Tegra Revision: %s SKU: %d CPU Process: %d Core Process: %d\n", |
| tegra_revision_name[tegra_sku_info.revision], |
| tegra_sku_info.sku_id, tegra_sku_info.cpu_process_id, |
| tegra_sku_info.core_process_id); |
| pr_debug("Tegra CPU Speedo ID %d, Soc Speedo ID %d\n", |
| tegra_sku_info.cpu_speedo_id, tegra_sku_info.soc_speedo_id); |
| |
| return 0; |
| } |
| early_initcall(tegra_init_fuse); |