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/*
* Copyright (C) 2014 Spreadtrum Communications Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
/* IMPORTANT:
*
* TODO:
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/stat.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <soc/sprd/arch_lock.h>
#include <soc/sprd/hardware.h>
#include <soc/sprd/adi.h>
#include <soc/sprd/sci.h>
#include <soc/sprd/sci_glb_regs.h>
#include "sprd_otp.h"
#define EFUSE_BLOCK_MAX ( 4 )
#define EFUSE_BLOCK_WIDTH ( 16 ) /* bit counts */
static DEFINE_MUTEX(afuse_mtx);
static void afuse_lock(void)
{
mutex_lock(&afuse_mtx);
arch_hwlock_fast(HWLOCK_EFUSE);
}
static void afuse_unlock(void)
{
arch_hwunlock_fast(HWLOCK_EFUSE);
mutex_unlock(&afuse_mtx);
}
static u32 afuse_read(int blk)
{
unsigned long timeout;
u32 val = 0;
pr_debug("adie laser_fuse read %d\n", blk);
afuse_lock();
if (blk < 0 || blk >= EFUSE_BLOCK_MAX) /* debug purpose */
goto out;
sci_adi_write_fast(ANA_REG_GLB_AFUSE_CTRL, BIT_AFUSE_READ_REQ, 1);
udelay(1);
/* wait for maximum of 300 msec */
timeout = jiffies + msecs_to_jiffies(300);
while (BIT_AFUSE_READ_REQ & sci_adi_read(ANA_REG_GLB_AFUSE_CTRL)) {
if (time_after(jiffies, timeout)) {
WARN_ON(1);
goto out;
}
cpu_relax();
}
val = sci_adi_read(ANA_REG_GLB_AFUSE_OUT0 + 4 * blk);
out:
afuse_unlock();
return val;
}
#define BITS_AFUSE_DLY_PROT_KEY (0xa2 << 8)
static void afuse_set_readdly(u32 dly)
{
u32 val = BITS_AFUSE_DLY_PROT_KEY + BITS_AFUSE_READ_DLY(dly);
afuse_lock();
sci_adi_write_fast(ANA_REG_GLB_AFUSE_CTRL, val, 0);
val &= ~BITS_AFUSE_DLY_PROT_KEY; /*release lock */
sci_adi_write_fast(ANA_REG_GLB_AFUSE_CTRL, val, 1);
afuse_unlock();
}
static struct sprd_otp_operations afuse_ops = {
.read = afuse_read,
};
u32 __adie_laserfuse_read(int blk_index)
{
return afuse_ops.read(blk_index);
}
EXPORT_SYMBOL_GPL(__adie_laserfuse_read);
static ssize_t afuse_block_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "adie laser_fuse blocks: %uX%ubits\n",
EFUSE_BLOCK_MAX, EFUSE_BLOCK_WIDTH);
}
static ssize_t afuse_readdly_store(struct device *pdev,
struct device_attribute *attr,
const char *buff, size_t size)
{
u32 dly;
sscanf(buff, "%x", &dly);
afuse_set_readdly(dly);
return size;
}
static ssize_t afuse_block_dump(struct device *dev,
struct device_attribute *attr, char *buf)
{
int idx;
char *p = buf;
p += sprintf(p, "adie laser_fuse blocks dump:\n");
for (idx = 0; idx < EFUSE_BLOCK_MAX; idx++) {
p += sprintf(p, "[%02d] %08x\n", idx,
__adie_laserfuse_read(idx));
}
return p - buf;
}
static DEVICE_ATTR(block, S_IRUGO, afuse_block_show, NULL);
static DEVICE_ATTR(readdly, S_IWUSR, NULL, afuse_readdly_store);
static DEVICE_ATTR(dump, S_IRUGO, afuse_block_dump, NULL);
int __init sprd_adie_laserfuse_init(void)
{
int ret;
void *dev;
dev =
sprd_otp_register("sprd_afuse_otp", &afuse_ops,
EFUSE_BLOCK_MAX, EFUSE_BLOCK_WIDTH / 8);
if (IS_ERR_OR_NULL(dev))
return PTR_ERR(dev);
ret = device_create_file(dev, &dev_attr_block);
ret |= device_create_file(dev, &dev_attr_readdly);
ret |= device_create_file(dev, &dev_attr_dump);
if (ret)
return ret;
return 0;
}
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