1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * MX31 CPU type detection
5 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
8 #include <linux/module.h>
9 #include <linux/of_address.h>
16 static int mx31_cpu_rev = -1;
23 { .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 },
24 { .srev = 0x10, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 },
25 { .srev = 0x11, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 },
26 { .srev = 0x12, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 },
27 { .srev = 0x13, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 },
28 { .srev = 0x14, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_2 },
29 { .srev = 0x15, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_2 },
30 { .srev = 0x28, .name = "i.MX31", .rev = IMX_CHIP_REVISION_2_0 },
31 { .srev = 0x29, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_2_0 },
34 static int mx31_read_cpu_rev(void)
36 void __iomem *iim_base;
37 struct device_node *np;
40 np = of_find_compatible_node(NULL, NULL, "fsl,imx31-iim");
41 iim_base = of_iomap(np, 0);
44 /* read SREV register from IIM module */
45 srev = imx_readl(iim_base + MXC_IIMSREV);
48 for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
49 if (srev == mx31_cpu_type[i].srev) {
50 imx_print_silicon_rev(mx31_cpu_type[i].name,
51 mx31_cpu_type[i].rev);
52 return mx31_cpu_type[i].rev;
55 imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN);
56 return IMX_CHIP_REVISION_UNKNOWN;
59 int mx31_revision(void)
61 if (mx31_cpu_rev == -1)
62 mx31_cpu_rev = mx31_read_cpu_rev();
66 EXPORT_SYMBOL(mx31_revision);