diff options
Diffstat (limited to 'arch/arm/mach-imx/cpu-imx25.c')
| -rw-r--r-- | arch/arm/mach-imx/cpu-imx25.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/cpu-imx25.c b/arch/arm/mach-imx/cpu-imx25.c new file mode 100644 index 000000000..cc86977d0 --- /dev/null +++ b/arch/arm/mach-imx/cpu-imx25.c @@ -0,0 +1,50 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * MX25 CPU type detection + * + * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> + * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved + */ +#include <linux/module.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> + +#include "iim.h" +#include "hardware.h" + +static int mx25_cpu_rev = -1; + +static int mx25_read_cpu_rev(void) +{ + u32 rev; + void __iomem *iim_base; + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, "fsl,imx25-iim"); + iim_base = of_iomap(np, 0); + of_node_put(np); + BUG_ON(!iim_base); + rev = readl(iim_base + MXC_IIMSREV); + iounmap(iim_base); + + switch (rev) { + case 0x00: + return IMX_CHIP_REVISION_1_0; + case 0x01: + return IMX_CHIP_REVISION_1_1; + case 0x02: + return IMX_CHIP_REVISION_1_2; + default: + return IMX_CHIP_REVISION_UNKNOWN; + } +} + +int mx25_revision(void) +{ + if (mx25_cpu_rev == -1) + mx25_cpu_rev = mx25_read_cpu_rev(); + + return mx25_cpu_rev; +} +EXPORT_SYMBOL(mx25_revision); |