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@@ -1,8 +1,7 @@
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/*
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* Blackfin On-Chip OTP Memory Interface
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- * Supports BF52x/BF54x
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*
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- * Copyright 2007-2008 Analog Devices Inc.
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+ * Copyright 2007-2009 Analog Devices Inc.
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*
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* Enter bugs at http://blackfin.uclinux.org/
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*
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@@ -17,8 +16,10 @@
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/types.h>
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+#include <mtd/mtd-abi.h>
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#include <asm/blackfin.h>
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+#include <asm/bfrom.h>
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#include <asm/uaccess.h>
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#define stamp(fmt, args...) pr_debug("%s:%i: " fmt "\n", __func__, __LINE__, ## args)
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@@ -30,39 +31,6 @@
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static DEFINE_MUTEX(bfin_otp_lock);
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-/* OTP Boot ROM functions */
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-#define _BOOTROM_OTP_COMMAND 0xEF000018
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-#define _BOOTROM_OTP_READ 0xEF00001A
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-#define _BOOTROM_OTP_WRITE 0xEF00001C
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-
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-static u32 (* const otp_command)(u32 command, u32 value) = (void *)_BOOTROM_OTP_COMMAND;
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-static u32 (* const otp_read)(u32 page, u32 flags, u64 *page_content) = (void *)_BOOTROM_OTP_READ;
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-static u32 (* const otp_write)(u32 page, u32 flags, u64 *page_content) = (void *)_BOOTROM_OTP_WRITE;
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-
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-/* otp_command(): defines for "command" */
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-#define OTP_INIT 0x00000001
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-#define OTP_CLOSE 0x00000002
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-
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-/* otp_{read,write}(): defines for "flags" */
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-#define OTP_LOWER_HALF 0x00000000 /* select upper/lower 64-bit half (bit 0) */
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-#define OTP_UPPER_HALF 0x00000001
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-#define OTP_NO_ECC 0x00000010 /* do not use ECC */
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-#define OTP_LOCK 0x00000020 /* sets page protection bit for page */
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-#define OTP_ACCESS_READ 0x00001000
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-#define OTP_ACCESS_READWRITE 0x00002000
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-
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-/* Return values for all functions */
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-#define OTP_SUCCESS 0x00000000
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-#define OTP_MASTER_ERROR 0x001
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-#define OTP_WRITE_ERROR 0x003
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-#define OTP_READ_ERROR 0x005
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-#define OTP_ACC_VIO_ERROR 0x009
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-#define OTP_DATA_MULT_ERROR 0x011
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-#define OTP_ECC_MULT_ERROR 0x021
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-#define OTP_PREV_WR_ERROR 0x041
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-#define OTP_DATA_SB_WARN 0x100
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-#define OTP_ECC_SB_WARN 0x200
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-
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/**
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* bfin_otp_read - Read OTP pages
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*
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@@ -86,9 +54,11 @@ static ssize_t bfin_otp_read(struct file *file, char __user *buff, size_t count,
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page = *pos / (sizeof(u64) * 2);
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while (bytes_done < count) {
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flags = (*pos % (sizeof(u64) * 2) ? OTP_UPPER_HALF : OTP_LOWER_HALF);
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- stamp("processing page %i (%s)", page, (flags == OTP_UPPER_HALF ? "upper" : "lower"));
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- ret = otp_read(page, flags, &content);
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+ stamp("processing page %i (0x%x:%s)", page, flags,
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+ (flags & OTP_UPPER_HALF ? "upper" : "lower"));
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+ ret = bfrom_OtpRead(page, flags, &content);
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if (ret & OTP_MASTER_ERROR) {
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+ stamp("error from otp: 0x%x", ret);
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bytes_done = -EIO;
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break;
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}
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@@ -96,7 +66,7 @@ static ssize_t bfin_otp_read(struct file *file, char __user *buff, size_t count,
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bytes_done = -EFAULT;
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break;
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}
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- if (flags == OTP_UPPER_HALF)
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+ if (flags & OTP_UPPER_HALF)
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++page;
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bytes_done += sizeof(content);
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*pos += sizeof(content);
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@@ -108,14 +78,53 @@ static ssize_t bfin_otp_read(struct file *file, char __user *buff, size_t count,
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}
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#ifdef CONFIG_BFIN_OTP_WRITE_ENABLE
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+static bool allow_writes;
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+
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+/**
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+ * bfin_otp_init_timing - setup OTP timing parameters
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+ *
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+ * Required before doing any write operation. Algorithms from HRM.
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+ */
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+static u32 bfin_otp_init_timing(void)
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+{
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+ u32 tp1, tp2, tp3, timing;
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+
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+ tp1 = get_sclk() / 1000000;
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+ tp2 = (2 * get_sclk() / 10000000) << 8;
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+ tp3 = (0x1401) << 15;
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+ timing = tp1 | tp2 | tp3;
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+ if (bfrom_OtpCommand(OTP_INIT, timing))
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+ return 0;
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+
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+ return timing;
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+}
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+
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+/**
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+ * bfin_otp_deinit_timing - set timings to only allow reads
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+ *
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+ * Should be called after all writes are done.
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+ */
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+static void bfin_otp_deinit_timing(u32 timing)
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+{
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+ /* mask bits [31:15] so that any attempts to write fail */
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+ bfrom_OtpCommand(OTP_CLOSE, 0);
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+ bfrom_OtpCommand(OTP_INIT, timing & ~(-1 << 15));
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+ bfrom_OtpCommand(OTP_CLOSE, 0);
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+}
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+
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/**
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- * bfin_otp_write - Write OTP pages
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+ * bfin_otp_write - write OTP pages
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*
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* All writes must be in half page chunks (half page == 64 bits).
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*/
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static ssize_t bfin_otp_write(struct file *filp, const char __user *buff, size_t count, loff_t *pos)
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{
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- stampit();
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+ ssize_t bytes_done;
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+ u32 timing, page, base_flags, flags, ret;
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+ u64 content;
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+
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+ if (!allow_writes)
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+ return -EACCES;
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if (count % sizeof(u64))
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return -EMSGSIZE;
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@@ -123,20 +132,96 @@ static ssize_t bfin_otp_write(struct file *filp, const char __user *buff, size_t
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if (mutex_lock_interruptible(&bfin_otp_lock))
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return -ERESTARTSYS;
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- /* need otp_init() documentation before this can be implemented */
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+ stampit();
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+
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+ timing = bfin_otp_init_timing();
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+ if (timing == 0) {
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+ mutex_unlock(&bfin_otp_lock);
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+ return -EIO;
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+ }
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+
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+ base_flags = OTP_CHECK_FOR_PREV_WRITE;
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+
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+ bytes_done = 0;
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+ page = *pos / (sizeof(u64) * 2);
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+ while (bytes_done < count) {
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+ flags = base_flags | (*pos % (sizeof(u64) * 2) ? OTP_UPPER_HALF : OTP_LOWER_HALF);
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+ stamp("processing page %i (0x%x:%s) from %p", page, flags,
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+ (flags & OTP_UPPER_HALF ? "upper" : "lower"), buff + bytes_done);
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+ if (copy_from_user(&content, buff + bytes_done, sizeof(content))) {
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+ bytes_done = -EFAULT;
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+ break;
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+ }
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+ ret = bfrom_OtpWrite(page, flags, &content);
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+ if (ret & OTP_MASTER_ERROR) {
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+ stamp("error from otp: 0x%x", ret);
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+ bytes_done = -EIO;
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+ break;
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+ }
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+ if (flags & OTP_UPPER_HALF)
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+ ++page;
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+ bytes_done += sizeof(content);
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+ *pos += sizeof(content);
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+ }
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+
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+ bfin_otp_deinit_timing(timing);
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mutex_unlock(&bfin_otp_lock);
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+ return bytes_done;
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+}
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+
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+static long bfin_otp_ioctl(struct file *filp, unsigned cmd, unsigned long arg)
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+{
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+ stampit();
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+
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+ switch (cmd) {
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+ case OTPLOCK: {
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+ u32 timing;
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+ int ret = -EIO;
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+
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+ if (!allow_writes)
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+ return -EACCES;
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+
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+ if (mutex_lock_interruptible(&bfin_otp_lock))
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+ return -ERESTARTSYS;
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+
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+ timing = bfin_otp_init_timing();
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+ if (timing) {
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+ u32 otp_result = bfrom_OtpWrite(arg, OTP_LOCK, NULL);
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+ stamp("locking page %lu resulted in 0x%x", arg, otp_result);
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+ if (!(otp_result & OTP_MASTER_ERROR))
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+ ret = 0;
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+
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+ bfin_otp_deinit_timing(timing);
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+ }
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+
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+ mutex_unlock(&bfin_otp_lock);
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+
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+ return ret;
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+ }
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+
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+ case MEMLOCK:
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+ allow_writes = false;
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+ return 0;
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+
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+ case MEMUNLOCK:
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+ allow_writes = true;
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+ return 0;
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+ }
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+
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return -EINVAL;
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}
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#else
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# define bfin_otp_write NULL
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+# define bfin_otp_ioctl NULL
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#endif
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static struct file_operations bfin_otp_fops = {
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- .owner = THIS_MODULE,
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- .read = bfin_otp_read,
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- .write = bfin_otp_write,
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+ .owner = THIS_MODULE,
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+ .unlocked_ioctl = bfin_otp_ioctl,
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+ .read = bfin_otp_read,
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+ .write = bfin_otp_write,
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};
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static struct miscdevice bfin_otp_misc_device = {
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