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/*
* arch/arm/mach-kirkwood/mpp.c
*
* MPP functions for Marvell Kirkwood SoCs
* Referenced from Linux kernel source
*
* 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 <common.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/kirkwood.h>
#include <asm/arch/mpp.h>
static u32 kirkwood_variant(void)
{
switch (readl(KW_REG_DEVICE_ID) & 0x03) {
case 1:
return MPP_F6192_MASK;
case 2:
return MPP_F6281_MASK;
default:
debug("MPP setup: unknown kirkwood variant\n");
return 0;
}
}
#define MPP_CTRL(i) (KW_MPP_BASE + (i* 4))
#define MPP_NR_REGS (1 + MPP_MAX/8)
void kirkwood_mpp_conf(u32 *mpp_list, u32 *mpp_save)
{
u32 mpp_ctrl[MPP_NR_REGS];
unsigned int variant_mask;
int i;
variant_mask = kirkwood_variant();
if (!variant_mask)
return;
debug( "initial MPP regs:");
for (i = 0; i < MPP_NR_REGS; i++) {
mpp_ctrl[i] = readl(MPP_CTRL(i));
debug(" %08x", mpp_ctrl[i]);
}
debug("\n");
while (*mpp_list) {
unsigned int num = MPP_NUM(*mpp_list);
unsigned int sel = MPP_SEL(*mpp_list);
unsigned int sel_save;
int shift;
if (num > MPP_MAX) {
debug("kirkwood_mpp_conf: invalid MPP "
"number (%u)\n", num);
continue;
}
if (!(*mpp_list & variant_mask)) {
debug("kirkwood_mpp_conf: requested MPP%u config "
"unavailable on this hardware\n", num);
continue;
}
shift = (num & 7) << 2;
if (mpp_save) {
sel_save = (mpp_ctrl[num / 8] >> shift) & 0xf;
*mpp_save = num | (sel_save << 8) | variant_mask;
mpp_save++;
}
mpp_ctrl[num / 8] &= ~(0xf << shift);
mpp_ctrl[num / 8] |= sel << shift;
mpp_list++;
}
debug(" final MPP regs:");
for (i = 0; i < MPP_NR_REGS; i++) {
writel(mpp_ctrl[i], MPP_CTRL(i));
debug(" %08x", mpp_ctrl[i]);
}
debug("\n");
}
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