mpp.c
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/*
* arch/arm/mach-dove/mpp.c
*
* MPP functions for Marvell Dove 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/gpio.h>
#include <linux/io.h>
#include <plat/mpp.h>
#include <mach/dove.h>
#include <plat/orion-gpio.h>
#include "mpp.h"
struct dove_mpp_grp {
int start;
int end;
};
/* Map a group to a range of GPIO pins in that group */
static const struct dove_mpp_grp dove_mpp_grp[] = {
[MPP_24_39] = {
.start = 24,
.end = 39,
},
[MPP_40_45] = {
.start = 40,
.end = 45,
},
[MPP_46_51] = {
.start = 46,
.end = 51,
},
[MPP_58_61] = {
.start = 58,
.end = 61,
},
[MPP_62_63] = {
.start = 62,
.end = 63,
},
};
/* Enable gpio for a range of pins. mode should be a combination of
GPIO_OUTPUT_OK | GPIO_INPUT_OK */
static void __init dove_mpp_gpio_mode(int start, int end, int gpio_mode)
{
int i;
for (i = start; i <= end; i++)
orion_gpio_set_valid(i, gpio_mode);
}
/* Dump all the extra MPP registers. The platform code will dump the
registers for pins 0-23. */
static void __init dove_mpp_dump_regs(void)
{
pr_debug("PMU_CTRL4_CTRL: %08x\n",
readl(DOVE_MPP_CTRL4_VIRT_BASE));
pr_debug("PMU_MPP_GENERAL_CTRL: %08x\n",
readl(DOVE_PMU_MPP_GENERAL_CTRL));
pr_debug("MPP_GENERAL: %08x\n", readl(DOVE_MPP_GENERAL_VIRT_BASE));
}
static void __init dove_mpp_cfg_nfc(int sel)
{
u32 mpp_gen_cfg = readl(DOVE_MPP_GENERAL_VIRT_BASE);
mpp_gen_cfg &= ~0x1;
mpp_gen_cfg |= sel;
writel(mpp_gen_cfg, DOVE_MPP_GENERAL_VIRT_BASE);
dove_mpp_gpio_mode(64, 71, GPIO_OUTPUT_OK);
}
static void __init dove_mpp_cfg_au1(int sel)
{
u32 mpp_ctrl4 = readl(DOVE_MPP_CTRL4_VIRT_BASE);
u32 ssp_ctrl1 = readl(DOVE_SSP_CTRL_STATUS_1);
u32 mpp_gen_ctrl = readl(DOVE_MPP_GENERAL_VIRT_BASE);
u32 global_cfg_2 = readl(DOVE_GLOBAL_CONFIG_2);
mpp_ctrl4 &= ~(DOVE_AU1_GPIO_SEL);
ssp_ctrl1 &= ~(DOVE_SSP_ON_AU1);
mpp_gen_ctrl &= ~(DOVE_AU1_SPDIFO_GPIO_EN);
global_cfg_2 &= ~(DOVE_TWSI_OPTION3_GPIO);
if (!sel || sel == 0x2)
dove_mpp_gpio_mode(52, 57, 0);
else
dove_mpp_gpio_mode(52, 57, GPIO_OUTPUT_OK | GPIO_INPUT_OK);
if (sel & 0x1) {
global_cfg_2 |= DOVE_TWSI_OPTION3_GPIO;
dove_mpp_gpio_mode(56, 57, 0);
}
if (sel & 0x2) {
mpp_gen_ctrl |= DOVE_AU1_SPDIFO_GPIO_EN;
dove_mpp_gpio_mode(57, 57, GPIO_OUTPUT_OK | GPIO_INPUT_OK);
}
if (sel & 0x4) {
ssp_ctrl1 |= DOVE_SSP_ON_AU1;
dove_mpp_gpio_mode(52, 55, 0);
}
if (sel & 0x8)
mpp_ctrl4 |= DOVE_AU1_GPIO_SEL;
writel(mpp_ctrl4, DOVE_MPP_CTRL4_VIRT_BASE);
writel(ssp_ctrl1, DOVE_SSP_CTRL_STATUS_1);
writel(mpp_gen_ctrl, DOVE_MPP_GENERAL_VIRT_BASE);
writel(global_cfg_2, DOVE_GLOBAL_CONFIG_2);
}
/* Configure the group registers, enabling GPIO if sel indicates the
pin is to be used for GPIO */
static void __init dove_mpp_conf_grp(unsigned int *mpp_grp_list)
{
u32 mpp_ctrl4 = readl(DOVE_MPP_CTRL4_VIRT_BASE);
int gpio_mode;
for ( ; *mpp_grp_list; mpp_grp_list++) {
unsigned int num = MPP_NUM(*mpp_grp_list);
unsigned int sel = MPP_SEL(*mpp_grp_list);
if (num > MPP_GRP_MAX) {
pr_err("dove: invalid MPP GRP number (%u)\n", num);
continue;
}
mpp_ctrl4 &= ~(0x1 << num);
mpp_ctrl4 |= sel << num;
gpio_mode = sel ? GPIO_OUTPUT_OK | GPIO_INPUT_OK : 0;
dove_mpp_gpio_mode(dove_mpp_grp[num].start,
dove_mpp_grp[num].end, gpio_mode);
}
writel(mpp_ctrl4, DOVE_MPP_CTRL4_VIRT_BASE);
}
/* Configure the various MPP pins on Dove */
void __init dove_mpp_conf(unsigned int *mpp_list,
unsigned int *mpp_grp_list,
unsigned int grp_au1_52_57,
unsigned int grp_nfc_64_71)
{
dove_mpp_dump_regs();
/* Use platform code for pins 0-23 */
orion_mpp_conf(mpp_list, 0, MPP_MAX, DOVE_MPP_VIRT_BASE);
dove_mpp_conf_grp(mpp_grp_list);
dove_mpp_cfg_au1(grp_au1_52_57);
dove_mpp_cfg_nfc(grp_nfc_64_71);
dove_mpp_dump_regs();
}