| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * MX35 CPU type detection |
| * |
| * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> |
| */ |
| #include <linux/module.h> |
| #include <linux/io.h> |
| |
| #include "hardware.h" |
| #include "iim.h" |
| |
| static int mx35_cpu_rev = -1; |
| |
| static int mx35_read_cpu_rev(void) |
| { |
| u32 rev; |
| |
| rev = imx_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV)); |
| switch (rev) { |
| case 0x00: |
| return IMX_CHIP_REVISION_1_0; |
| case 0x10: |
| return IMX_CHIP_REVISION_2_0; |
| case 0x11: |
| return IMX_CHIP_REVISION_2_1; |
| default: |
| return IMX_CHIP_REVISION_UNKNOWN; |
| } |
| } |
| |
| int mx35_revision(void) |
| { |
| if (mx35_cpu_rev == -1) |
| mx35_cpu_rev = mx35_read_cpu_rev(); |
| |
| return mx35_cpu_rev; |
| } |
| EXPORT_SYMBOL(mx35_revision); |
