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/*
* arch/arm/mach-kirkwood/mpp.c
*
* MPP functions for Marvell Kirkwood 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/mbus.h>
#include <linux/io.h>
#include <asm/gpio.h>
#include <mach/hardware.h>
#include "common.h"
#include "mpp.h"
static unsigned int __init kirkwood_variant(void)
{
u32 dev, rev;
kirkwood_pcie_id(&dev, &rev);
if (dev == MV88F6281_DEV_ID && rev >= MV88F6281_REV_A0)
return MPP_F6281_MASK;
if (dev == MV88F6192_DEV_ID && rev >= MV88F6192_REV_A0)
return MPP_F6192_MASK;
if (dev == MV88F6180_DEV_ID)
return MPP_F6180_MASK;
printk(KERN_ERR "MPP setup: unknown kirkwood variant "
"(dev %#x rev %#x)\n", dev, rev);
return 0;
}
#define MPP_CTRL(i) (DEV_BUS_VIRT_BASE + (i) * 4)
#define MPP_NR_REGS (1 + MPP_MAX/8)
void __init kirkwood_mpp_conf(unsigned int *mpp_list)
{
u32 mpp_ctrl[MPP_NR_REGS];
unsigned int variant_mask;
int i;
variant_mask = kirkwood_variant();
if (!variant_mask)
return;
/* Initialize gpiolib. */
orion_gpio_init();
printk(KERN_DEBUG "initial MPP regs:");
for (i = 0; i < MPP_NR_REGS; i++) {
mpp_ctrl[i] = readl(MPP_CTRL(i));
printk(" %08x", mpp_ctrl[i]);
}
printk("\n");
while (*mpp_list) {
unsigned int num = MPP_NUM(*mpp_list);
unsigned int sel = MPP_SEL(*mpp_list);
int shift, gpio_mode;
if (num > MPP_MAX) {
printk(KERN_ERR "kirkwood_mpp_conf: invalid MPP "
"number (%u)\n", num);
continue;
}
if (!(*mpp_list & variant_mask)) {
printk(KERN_WARNING
"kirkwood_mpp_conf: requested MPP%u config "
"unavailable on this hardware\n", num);
continue;
}
shift = (num & 7) << 2;
mpp_ctrl[num / 8] &= ~(0xf << shift);
mpp_ctrl[num / 8] |= sel << shift;
gpio_mode = 0;
if (*mpp_list & MPP_INPUT_MASK)
gpio_mode |= GPIO_INPUT_OK;
if (*mpp_list & MPP_OUTPUT_MASK)
gpio_mode |= GPIO_OUTPUT_OK;
if (sel != 0)
gpio_mode = 0;
orion_gpio_set_valid(num, gpio_mode);
mpp_list++;
}
printk(KERN_DEBUG " final MPP regs:");
for (i = 0; i < MPP_NR_REGS; i++) {
writel(mpp_ctrl[i], MPP_CTRL(i));
printk(" %08x", mpp_ctrl[i]);
}
printk("\n");
}
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