1 files changed, 158 insertions, 0 deletions
diff --git a/drivers/misc/sprd_otp/laser_fuse.c b/drivers/misc/sprd_otp/laser_fuse.c
new file mode 100644
index 00000000..4df8a897
--- /dev/null
+++ b/drivers/misc/sprd_otp/laser_fuse.c
@@ -0,0 +1,158 @@
+/*
+ * 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;
+}