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/* linux/arch/arm/mach-exynos/asv-4x12.c
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* EXYNOS5250 - ASV(Adaptive Supply Voltage) driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/string.h>
#include <mach/asv.h>
#include <mach/map.h>
#include <plat/cpu.h>
/* ASV function for Fused Chip */
#define IDS_ARM_OFFSET 24
#define IDS_ARM_MASK 0xFF
#define HPM_OFFSET 12
#define HPM_MASK 0x1F
#define FUSED_SG_OFFSET 3
#define ORIG_SG_OFFSET 17
#define ORIG_SG_MASK 0xF
#define MOD_SG_OFFSET 21
#define MOD_SG_MASK 0x7
#define DEFAULT_ASV_GROUP 1
#define CHIP_ID_REG (S5P_VA_CHIPID + 0x4)
#define LOT_ID_REG (S5P_VA_CHIPID + 0x14)
struct asv_judge_table exynos5250_limit[] = {
/* HPM, IDS */
{ 0, 0}, /* Reserved Group */
{ 9, 7},
{ 10, 9},
{ 12, 11},
{ 14, 14},
{ 15, 17},
{ 16, 20},
{ 17, 23},
{ 18, 27},
{ 19, 30},
{100, 100},
{999, 999}, /* Reserved Group */
};
static int exynos5250_get_hpm(struct samsung_asv *asv_info)
{
asv_info->hpm_result = (asv_info->pkg_id >> HPM_OFFSET) & HPM_MASK;
return 0;
}
static int exynos5250_get_ids(struct samsung_asv *asv_info)
{
asv_info->ids_result = (asv_info->pkg_id >> IDS_ARM_OFFSET) & IDS_ARM_MASK;
return 0;
}
/*
* If lot id is "NZVPU", it is need to modify for ARM_IDS value
*/
static int exynos5250_check_lot_id(void)
{
unsigned int lid_reg = 0;
unsigned int rev_lid = 0;
unsigned int i;
unsigned int tmp;
char lot_id[5];
lid_reg = __raw_readl(LOT_ID_REG);
for (i = 0; i < 32; i++) {
tmp = (lid_reg >> i) & 0x1;
rev_lid += tmp << (31 - i);
}
lot_id[0] = 'N';
lid_reg = (rev_lid >> 11) & 0x1FFFFF;
for (i = 4; i >= 1; i--) {
tmp = lid_reg % 36;
lid_reg /= 36;
lot_id[i] = (tmp < 10) ? (tmp + '0') : ((tmp - 10) + 'A');
}
return strncmp(lot_id, "NZVPU", ARRAY_SIZE(lot_id));
}
static void exynos5250_pre_set_abb(void)
{
switch (exynos_result_of_asv) {
case 0:
case 1:
case 2:
exynos4x12_set_abb(ABB_MODE_080V);
break;
case 3:
case 4:
exynos4x12_set_abb(ABB_MODE_BYPASS);
break;
default:
exynos4x12_set_abb(ABB_MODE_130V);
break;
}
}
static int exynos5250_asv_store_result(struct samsung_asv *asv_info)
{
unsigned int i;
if (!exynos5250_check_lot_id())
asv_info->ids_result -= 15;
if (soc_is_exynos5250()) {
for (i = 0; i < ARRAY_SIZE(exynos5250_limit); i++) {
if ((asv_info->ids_result <= exynos5250_limit[i].ids_limit) ||
(asv_info->hpm_result <= exynos5250_limit[i].hpm_limit)) {
exynos_result_of_asv = i;
break;
}
}
}
/*
* If ASV result value is lower than default value
* Fix with default value.
*/
if (exynos_result_of_asv < DEFAULT_ASV_GROUP)
exynos_result_of_asv = DEFAULT_ASV_GROUP;
pr_info("EXYNOS5250(NO SG): IDS : %d HPM : %d RESULT : %d\n",
asv_info->ids_result, asv_info->hpm_result, exynos_result_of_asv);
exynos5250_pre_set_abb();
return 0;
}
int exynos5250_asv_init(struct samsung_asv *asv_info)
{
unsigned int tmp;
unsigned int exynos_orig_sp;
unsigned int exynos_mod_sp;
int exynos_cal_asv;
exynos_result_of_asv = 0;
pr_info("EXYNOS5250: Adaptive Support Voltage init\n");
tmp = __raw_readl(CHIP_ID_REG);
/* Store PKG_ID */
asv_info->pkg_id = tmp;
/* If Speed group is fused, get speed group from */
if ((tmp >> FUSED_SG_OFFSET) & 0x1) {
exynos_orig_sp = (tmp >> ORIG_SG_OFFSET) & ORIG_SG_MASK;
exynos_mod_sp = (tmp >> MOD_SG_OFFSET) & MOD_SG_MASK;
exynos_cal_asv = exynos_orig_sp - exynos_mod_sp;
/*
* If There is no origin speed group,
* store 1 asv group into exynos_result_of_asv.
*/
if (!exynos_orig_sp) {
pr_info("EXYNOS5250: No Origin speed Group\n");
exynos_result_of_asv = DEFAULT_ASV_GROUP;
} else {
if (exynos_cal_asv < DEFAULT_ASV_GROUP)
exynos_result_of_asv = DEFAULT_ASV_GROUP;
else
exynos_result_of_asv = exynos_cal_asv;
}
pr_info("EXYNOS5250(SG): ORIG : %d MOD : %d RESULT : %d\n",
exynos_orig_sp, exynos_mod_sp, exynos_result_of_asv);
return -EEXIST;
}
asv_info->get_ids = exynos5250_get_ids;
asv_info->get_hpm = exynos5250_get_hpm;
asv_info->store_result = exynos5250_asv_store_result;
return 0;
}
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