You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
1.8 KiB
C
93 lines
1.8 KiB
C
/*
|
|
* arch/arm/mach-mcs814x/common.c
|
|
*
|
|
* Core functions for Moschip MCS814x SoCs
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/mach-types.h>
|
|
#include <asm/mach/arch.h>
|
|
#include <mach/hardware.h>
|
|
#include <mach/cpu.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mach/map.h>
|
|
|
|
static struct map_desc mcs814x_io_desc[] __initdata = {
|
|
{
|
|
.virtual = MCS814X_IO_BASE,
|
|
.pfn = __phys_to_pfn(MCS814X_IO_START),
|
|
.length = MCS814X_IO_SIZE,
|
|
.type = MT_DEVICE
|
|
},
|
|
};
|
|
|
|
#define SYSDBG_BS2 0x04
|
|
#define CPU_MODE_SHIFT 23
|
|
#define CPU_MODE_MASK 0x03
|
|
|
|
struct cpu_mode {
|
|
const char *name;
|
|
int gpio_start;
|
|
int gpio_end;
|
|
};
|
|
|
|
static const struct cpu_mode cpu_modes[] = {
|
|
{
|
|
.name = "I2S",
|
|
.gpio_start = 4,
|
|
.gpio_end = 8,
|
|
},
|
|
{
|
|
.name = "UART",
|
|
.gpio_start = 4,
|
|
.gpio_end = 9,
|
|
},
|
|
{
|
|
.name = "External MII",
|
|
.gpio_start = 0,
|
|
.gpio_end = 16,
|
|
},
|
|
{
|
|
.name = "Normal",
|
|
.gpio_start = -1,
|
|
.gpio_end = -1,
|
|
},
|
|
};
|
|
|
|
void __init mcs814x_init_machine(void)
|
|
{
|
|
u32 bs2, cpu_mode;
|
|
int gpio;
|
|
|
|
bs2 = __raw_readl(_CONFADDR_SYSDBG + SYSDBG_BS2);
|
|
cpu_mode = (bs2 >> CPU_MODE_SHIFT) & CPU_MODE_MASK;
|
|
|
|
pr_info("CPU mode: %s\n", cpu_modes[cpu_mode].name);
|
|
|
|
/* request the gpios since the pins are muxed for functionnality */
|
|
for (gpio = cpu_modes[cpu_mode].gpio_start;
|
|
gpio == cpu_modes[cpu_mode].gpio_end; gpio++) {
|
|
if (gpio != -1)
|
|
gpio_request(gpio, cpu_modes[cpu_mode].name);
|
|
}
|
|
}
|
|
|
|
void __init mcs814x_map_io(void)
|
|
{
|
|
iotable_init(mcs814x_io_desc, ARRAY_SIZE(mcs814x_io_desc));
|
|
}
|
|
|
|
void mcs814x_restart(char mode, const char *cmd)
|
|
{
|
|
__raw_writel(~(1 << 31), _CONFADDR_SYSDBG);
|
|
}
|