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66 lines
1.7 KiB
66 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* MX31 CPU type detection |
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* |
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* Copyright (c) 2009 Daniel Mack <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/of_address.h> |
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#include <linux/io.h> |
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#include "common.h" |
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#include "hardware.h" |
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#include "iim.h" |
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static int mx31_cpu_rev = -1; |
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static struct { |
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u8 srev; |
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const char *name; |
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unsigned int rev; |
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} mx31_cpu_type[] = { |
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{ .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 }, |
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{ .srev = 0x10, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 }, |
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{ .srev = 0x11, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 }, |
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{ .srev = 0x12, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 }, |
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{ .srev = 0x13, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 }, |
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{ .srev = 0x14, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_2 }, |
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{ .srev = 0x15, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_2 }, |
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{ .srev = 0x28, .name = "i.MX31", .rev = IMX_CHIP_REVISION_2_0 }, |
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{ .srev = 0x29, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_2_0 }, |
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}; |
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static int mx31_read_cpu_rev(void) |
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{ |
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void __iomem *iim_base; |
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struct device_node *np; |
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u32 i, srev; |
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np = of_find_compatible_node(NULL, NULL, "fsl,imx31-iim"); |
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iim_base = of_iomap(np, 0); |
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BUG_ON(!iim_base); |
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/* read SREV register from IIM module */ |
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srev = imx_readl(iim_base + MXC_IIMSREV); |
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srev &= 0xff; |
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for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++) |
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if (srev == mx31_cpu_type[i].srev) { |
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imx_print_silicon_rev(mx31_cpu_type[i].name, |
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mx31_cpu_type[i].rev); |
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return mx31_cpu_type[i].rev; |
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} |
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imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN); |
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return IMX_CHIP_REVISION_UNKNOWN; |
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} |
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int mx31_revision(void) |
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{ |
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if (mx31_cpu_rev == -1) |
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mx31_cpu_rev = mx31_read_cpu_rev(); |
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return mx31_cpu_rev; |
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} |
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EXPORT_SYMBOL(mx31_revision);
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