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93 lines
1.8 KiB
C
93 lines
1.8 KiB
C
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/*
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* arch/arm/mach-mcs814x/common.c
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*
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* Core functions for Moschip MCS814x SoCs
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <asm/setup.h>
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include <mach/hardware.h>
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#include <mach/cpu.h>
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#include <asm/pgtable.h>
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#include <asm/mach/map.h>
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static struct map_desc mcs814x_io_desc[] __initdata = {
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{
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.virtual = MCS814X_IO_BASE,
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.pfn = __phys_to_pfn(MCS814X_IO_START),
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.length = MCS814X_IO_SIZE,
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.type = MT_DEVICE
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},
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};
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#define SYSDBG_BS2 0x04
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#define CPU_MODE_SHIFT 23
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#define CPU_MODE_MASK 0x03
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struct cpu_mode {
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const char *name;
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int gpio_start;
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int gpio_end;
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};
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static const struct cpu_mode cpu_modes[] = {
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{
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.name = "I2S",
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.gpio_start = 4,
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.gpio_end = 8,
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},
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{
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.name = "UART",
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.gpio_start = 4,
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.gpio_end = 9,
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},
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{
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.name = "External MII",
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.gpio_start = 0,
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.gpio_end = 16,
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},
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{
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.name = "Normal",
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.gpio_start = -1,
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.gpio_end = -1,
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},
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};
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void __init mcs814x_init_machine(void)
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{
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u32 bs2, cpu_mode;
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int gpio;
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bs2 = __raw_readl(_CONFADDR_SYSDBG + SYSDBG_BS2);
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cpu_mode = (bs2 >> CPU_MODE_SHIFT) & CPU_MODE_MASK;
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pr_info("CPU mode: %s\n", cpu_modes[cpu_mode].name);
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/* request the gpios since the pins are muxed for functionnality */
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for (gpio = cpu_modes[cpu_mode].gpio_start;
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gpio == cpu_modes[cpu_mode].gpio_end; gpio++) {
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if (gpio != -1)
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gpio_request(gpio, cpu_modes[cpu_mode].name);
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}
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}
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void __init mcs814x_map_io(void)
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{
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iotable_init(mcs814x_io_desc, ARRAY_SIZE(mcs814x_io_desc));
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}
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void mcs814x_restart(char mode, const char *cmd)
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{
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__raw_writel(~(1 << 31), _CONFADDR_SYSDBG);
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}
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