char: remove blackfin OTP driver
The blackfin architecture is getting removed, so we don't need this driver any more. Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Aaron Wu <aaron.wu@analog.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>hifive-unleashed-5.1
Arnd Bergmann
parent
315e80e7fb
commit
64f5fdd951
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@ -66,34 +66,6 @@ config TTY_PRINTK
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If unsure, say N.
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config BFIN_OTP
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tristate "Blackfin On-Chip OTP Memory Support"
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depends on BLACKFIN && (BF51x || BF52x || BF54x)
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default y
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help
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If you say Y here, you will get support for a character device
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interface into the One Time Programmable memory pages that are
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stored on the Blackfin processor. This will not get you access
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to the secure memory pages however. You will need to write your
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own secure code and reader for that.
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To compile this driver as a module, choose M here: the module
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will be called bfin-otp.
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If unsure, it is safe to say Y.
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config BFIN_OTP_WRITE_ENABLE
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bool "Enable writing support of OTP pages"
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depends on BFIN_OTP
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default n
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help
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If you say Y here, you will enable support for writing of the
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OTP pages. This is dangerous by nature as you can only program
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the pages once, so only enable this option when you actually
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need it so as to not inadvertently clobber data.
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If unsure, say N.
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config PRINTER
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tristate "Parallel printer support"
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depends on PARPORT
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@ -14,7 +14,6 @@ obj-$(CONFIG_MSPEC) += mspec.o
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obj-$(CONFIG_UV_MMTIMER) += uv_mmtimer.o
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obj-$(CONFIG_IBM_BSR) += bsr.o
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obj-$(CONFIG_SGI_MBCS) += mbcs.o
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obj-$(CONFIG_BFIN_OTP) += bfin-otp.o
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obj-$(CONFIG_PRINTER) += lp.o
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@ -1,237 +0,0 @@
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/*
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* Blackfin On-Chip OTP Memory Interface
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*
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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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* Licensed under the GPL-2 or later.
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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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 <linux/uaccess.h>
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#define stamp(fmt, args...) pr_debug("%s:%i: " fmt "\n", __func__, __LINE__, ## args)
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#define stampit() stamp("here i am")
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#define pr_init(fmt, args...) ({ static const __initconst char __fmt[] = fmt; printk(__fmt, ## args); })
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#define DRIVER_NAME "bfin-otp"
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#define PFX DRIVER_NAME ": "
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static DEFINE_MUTEX(bfin_otp_lock);
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/**
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* bfin_otp_read - Read OTP pages
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*
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* All reads must be in half page chunks (half page == 64 bits).
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*/
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static ssize_t bfin_otp_read(struct file *file, char __user *buff, size_t count, loff_t *pos)
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{
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ssize_t bytes_done;
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u32 page, flags, ret;
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u64 content;
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stampit();
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if (count % sizeof(u64))
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return -EMSGSIZE;
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if (mutex_lock_interruptible(&bfin_otp_lock))
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return -ERESTARTSYS;
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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 = (*pos % (sizeof(u64) * 2) ? OTP_UPPER_HALF : OTP_LOWER_HALF);
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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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if (copy_to_user(buff + bytes_done, &content, sizeof(content))) {
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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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++page;
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bytes_done += sizeof(content);
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*pos += sizeof(content);
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}
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mutex_unlock(&bfin_otp_lock);
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return bytes_done;
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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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* 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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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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return timing;
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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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* 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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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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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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if (mutex_lock_interruptible(&bfin_otp_lock))
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return -ERESTARTSYS;
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stampit();
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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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base_flags = OTP_CHECK_FOR_PREV_WRITE;
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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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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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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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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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if (!allow_writes)
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return -EACCES;
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if (mutex_lock_interruptible(&bfin_otp_lock))
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return -ERESTARTSYS;
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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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bfin_otp_deinit_timing(timing);
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}
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mutex_unlock(&bfin_otp_lock);
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return ret;
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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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case MEMUNLOCK:
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allow_writes = true;
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return 0;
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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 const struct file_operations bfin_otp_fops = {
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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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.llseek = default_llseek,
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};
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static struct miscdevice bfin_otp_misc_device = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = DRIVER_NAME,
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.fops = &bfin_otp_fops,
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};
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module_misc_device(bfin_otp_misc_device);
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MODULE_AUTHOR("Mike Frysinger <vapier@gentoo.org>");
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MODULE_DESCRIPTION("Blackfin OTP Memory Interface");
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MODULE_LICENSE("GPL");
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