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/*
* 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 <linux/of.h>
#include <linux/of_address.h>
#include <linux/reboot.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <mach/mcs814x.h>
#include <mach/cpu.h>
#include <asm/pgtable.h>
#include <asm/mach/map.h>
void __iomem *mcs814x_sysdbg_base;
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
},
};
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,
},
};
static void mcs814x_eth_hardware_filter_set(u8 value)
{
u32 reg;
reg = readl_relaxed(MCS814X_VIRT_BASE + MCS814X_DBGLED);
if (value)
reg |= 0x80;
else
reg &= ~0x80;
writel_relaxed(reg, MCS814X_VIRT_BASE + MCS814X_DBGLED);
}
static void mcs814x_eth_led_cfg_set(u8 cfg)
{
u32 reg;
reg = readl_relaxed(mcs814x_sysdbg_base + SYSDBG_BS2);
reg &= ~LED_CFG_MASK;
reg |= cfg;
writel_relaxed(reg, mcs814x_sysdbg_base + SYSDBG_BS2);
}
static void mcs814x_eth_buffer_shifting_set(u8 value)
{
u8 reg;
reg = readb_relaxed(mcs814x_sysdbg_base + SYSDBG_SYSCTL_MAC);
if (value)
reg |= BUF_SHIFT_BIT;
else
reg &= ~BUF_SHIFT_BIT;
writeb_relaxed(reg, mcs814x_sysdbg_base + SYSDBG_SYSCTL_MAC);
}
static struct of_device_id mcs814x_eth_ids[] __initdata = {
{ .compatible = "moschip,nuport-mac", },
{ /* sentinel */ },
};
/* Configure platform specific knobs based on ethernet device node
* properties */
static void mcs814x_eth_init(void)
{
struct device_node *np;
const unsigned int *intspec;
np = of_find_matching_node(NULL, mcs814x_eth_ids);
if (!np)
return;
/* hardware filter must always be enabled */
mcs814x_eth_hardware_filter_set(1);
intspec = of_get_property(np, "nuport-mac,buffer-shifting", NULL);
if (!intspec)
mcs814x_eth_buffer_shifting_set(0);
else
mcs814x_eth_buffer_shifting_set(1);
intspec = of_get_property(np, "nuport-mac,link-activity", NULL);
if (intspec)
mcs814x_eth_led_cfg_set(be32_to_cpup(intspec));
of_node_put(np);
}
void __init mcs814x_init_machine(void)
{
u32 bs2, cpu_mode;
int gpio;
bs2 = readl_relaxed(mcs814x_sysdbg_base + 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);
}
mcs814x_eth_init();
}
void __init mcs814x_map_io(void)
{
iotable_init(mcs814x_io_desc, ARRAY_SIZE(mcs814x_io_desc));
mcs814x_sysdbg_base = ioremap(MCS814X_IO_START + MCS814X_SYSDBG,
MCS814X_SYSDBG_SIZE);
if (!mcs814x_sysdbg_base)
panic("unable to remap sysdbg base");
}
void mcs814x_restart(enum reboot_mode mode, const char *cmd)
{
writel_relaxed(~(1 << 31), mcs814x_sysdbg_base);
}
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