diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/Kconfig | 48 | ||||
| -rw-r--r-- | drivers/char/Makefile | 3 | ||||
| -rw-r--r-- | drivers/char/bfin-otp.c | 237 | ||||
| -rw-r--r-- | drivers/char/ds1302.c | 357 | ||||
| -rw-r--r-- | drivers/char/tile-srom.c | 475 |
5 files changed, 0 insertions, 1120 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index c28dca0c613d..40947a796666 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -66,34 +66,6 @@ config TTY_PRINTK If unsure, say N. -config BFIN_OTP - tristate "Blackfin On-Chip OTP Memory Support" - depends on BLACKFIN && (BF51x || BF52x || BF54x) - default y - help - If you say Y here, you will get support for a character device - interface into the One Time Programmable memory pages that are - stored on the Blackfin processor. This will not get you access - to the secure memory pages however. You will need to write your - own secure code and reader for that. - - To compile this driver as a module, choose M here: the module - will be called bfin-otp. - - If unsure, it is safe to say Y. - -config BFIN_OTP_WRITE_ENABLE - bool "Enable writing support of OTP pages" - depends on BFIN_OTP - default n - help - If you say Y here, you will enable support for writing of the - OTP pages. This is dangerous by nature as you can only program - the pages once, so only enable this option when you actually - need it so as to not inadvertently clobber data. - - If unsure, say N. - config PRINTER tristate "Parallel printer support" depends on PARPORT @@ -346,15 +318,6 @@ config EFI_RTC bool "EFI Real Time Clock Services" depends on IA64 -config DS1302 - tristate "DS1302 RTC support" - depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT) - help - If you say Y here and create a character special file /dev/rtc with - major number 121 and minor number 0 using mknod ("man mknod"), you - will get access to the real time clock (or hardware clock) built - into your computer. - endif # RTC_LIB config DTLK @@ -575,17 +538,6 @@ config DEVPORT source "drivers/s390/char/Kconfig" -config TILE_SROM - tristate "Character-device access via hypervisor to the Tilera SPI ROM" - depends on TILE - default y - ---help--- - This device provides character-level read-write access - to the SROM, typically via the "0", "1", and "2" devices - in /dev/srom/. The Tilera hypervisor makes the flash - device appear much like a simple EEPROM, and knows - how to partition a single ROM for multiple purposes. - source "drivers/char/xillybus/Kconfig" endmenu diff --git a/drivers/char/Makefile b/drivers/char/Makefile index 7dc3abe66464..c97c768cd1dd 100644 --- a/drivers/char/Makefile +++ b/drivers/char/Makefile @@ -14,7 +14,6 @@ obj-$(CONFIG_MSPEC) += mspec.o obj-$(CONFIG_UV_MMTIMER) += uv_mmtimer.o obj-$(CONFIG_IBM_BSR) += bsr.o obj-$(CONFIG_SGI_MBCS) += mbcs.o -obj-$(CONFIG_BFIN_OTP) += bfin-otp.o obj-$(CONFIG_PRINTER) += lp.o @@ -26,7 +25,6 @@ obj-$(CONFIG_SONYPI) += sonypi.o obj-$(CONFIG_RTC) += rtc.o obj-$(CONFIG_HPET) += hpet.o obj-$(CONFIG_EFI_RTC) += efirtc.o -obj-$(CONFIG_DS1302) += ds1302.o obj-$(CONFIG_XILINX_HWICAP) += xilinx_hwicap/ ifeq ($(CONFIG_GENERIC_NVRAM),y) obj-$(CONFIG_NVRAM) += generic_nvram.o @@ -57,6 +55,5 @@ obj-$(CONFIG_PS3_FLASH) += ps3flash.o obj-$(CONFIG_JS_RTC) += js-rtc.o js-rtc-y = rtc.o -obj-$(CONFIG_TILE_SROM) += tile-srom.o obj-$(CONFIG_XILLYBUS) += xillybus/ obj-$(CONFIG_POWERNV_OP_PANEL) += powernv-op-panel.o diff --git a/drivers/char/bfin-otp.c b/drivers/char/bfin-otp.c deleted file mode 100644 index 0584025bb0c2..000000000000 --- a/drivers/char/bfin-otp.c +++ /dev/null @@ -1,237 +0,0 @@ -/* - * Blackfin On-Chip OTP Memory Interface - * - * Copyright 2007-2009 Analog Devices Inc. - * - * Enter bugs at http://blackfin.uclinux.org/ - * - * Licensed under the GPL-2 or later. - */ - -#include <linux/device.h> -#include <linux/errno.h> -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/miscdevice.h> -#include <linux/module.h> -#include <linux/mutex.h> -#include <linux/types.h> -#include <mtd/mtd-abi.h> - -#include <asm/blackfin.h> -#include <asm/bfrom.h> -#include <linux/uaccess.h> - -#define stamp(fmt, args...) pr_debug("%s:%i: " fmt "\n", __func__, __LINE__, ## args) -#define stampit() stamp("here i am") -#define pr_init(fmt, args...) ({ static const __initconst char __fmt[] = fmt; printk(__fmt, ## args); }) - -#define DRIVER_NAME "bfin-otp" -#define PFX DRIVER_NAME ": " - -static DEFINE_MUTEX(bfin_otp_lock); - -/** - * bfin_otp_read - Read OTP pages - * - * All reads must be in half page chunks (half page == 64 bits). - */ -static ssize_t bfin_otp_read(struct file *file, char __user *buff, size_t count, loff_t *pos) -{ - ssize_t bytes_done; - u32 page, flags, ret; - u64 content; - - stampit(); - - if (count % sizeof(u64)) - return -EMSGSIZE; - - if (mutex_lock_interruptible(&bfin_otp_lock)) - return -ERESTARTSYS; - - bytes_done = 0; - page = *pos / (sizeof(u64) * 2); - while (bytes_done < count) { - flags = (*pos % (sizeof(u64) * 2) ? OTP_UPPER_HALF : OTP_LOWER_HALF); - stamp("processing page %i (0x%x:%s)", page, flags, - (flags & OTP_UPPER_HALF ? "upper" : "lower")); - ret = bfrom_OtpRead(page, flags, &content); - if (ret & OTP_MASTER_ERROR) { - stamp("error from otp: 0x%x", ret); - bytes_done = -EIO; - break; - } - if (copy_to_user(buff + bytes_done, &content, sizeof(content))) { - bytes_done = -EFAULT; - break; - } - if (flags & OTP_UPPER_HALF) - ++page; - bytes_done += sizeof(content); - *pos += sizeof(content); - } - - mutex_unlock(&bfin_otp_lock); - - return bytes_done; -} - -#ifdef CONFIG_BFIN_OTP_WRITE_ENABLE -static bool allow_writes; - -/** - * bfin_otp_init_timing - setup OTP timing parameters - * - * Required before doing any write operation. Algorithms from HRM. - */ -static u32 bfin_otp_init_timing(void) -{ - u32 tp1, tp2, tp3, timing; - - tp1 = get_sclk() / 1000000; - tp2 = (2 * get_sclk() / 10000000) << 8; - tp3 = (0x1401) << 15; - timing = tp1 | tp2 | tp3; - if (bfrom_OtpCommand(OTP_INIT, timing)) - return 0; - - return timing; -} - -/** - * bfin_otp_deinit_timing - set timings to only allow reads - * - * Should be called after all writes are done. - */ -static void bfin_otp_deinit_timing(u32 timing) -{ - /* mask bits [31:15] so that any attempts to write fail */ - bfrom_OtpCommand(OTP_CLOSE, 0); - bfrom_OtpCommand(OTP_INIT, timing & ~(-1 << 15)); - bfrom_OtpCommand(OTP_CLOSE, 0); -} - -/** - * bfin_otp_write - write OTP pages - * - * All writes must be in half page chunks (half page == 64 bits). - */ -static ssize_t bfin_otp_write(struct file *filp, const char __user *buff, size_t count, loff_t *pos) -{ - ssize_t bytes_done; - u32 timing, page, base_flags, flags, ret; - u64 content; - - if (!allow_writes) - return -EACCES; - - if (count % sizeof(u64)) - return -EMSGSIZE; - - if (mutex_lock_interruptible(&bfin_otp_lock)) - return -ERESTARTSYS; - - stampit(); - - timing = bfin_otp_init_timing(); - if (timing == 0) { - mutex_unlock(&bfin_otp_lock); - return -EIO; - } - - base_flags = OTP_CHECK_FOR_PREV_WRITE; - - bytes_done = 0; - page = *pos / (sizeof(u64) * 2); - while (bytes_done < count) { - flags = base_flags | (*pos % (sizeof(u64) * 2) ? OTP_UPPER_HALF : OTP_LOWER_HALF); - stamp("processing page %i (0x%x:%s) from %p", page, flags, - (flags & OTP_UPPER_HALF ? "upper" : "lower"), buff + bytes_done); - if (copy_from_user(&content, buff + bytes_done, sizeof(content))) { - bytes_done = -EFAULT; - break; - } - ret = bfrom_OtpWrite(page, flags, &content); - if (ret & OTP_MASTER_ERROR) { - stamp("error from otp: 0x%x", ret); - bytes_done = -EIO; - break; - } - if (flags & OTP_UPPER_HALF) - ++page; - bytes_done += sizeof(content); - *pos += sizeof(content); - } - - bfin_otp_deinit_timing(timing); - - mutex_unlock(&bfin_otp_lock); - - return bytes_done; -} - -static long bfin_otp_ioctl(struct file *filp, unsigned cmd, unsigned long arg) -{ - stampit(); - - switch (cmd) { - case OTPLOCK: { - u32 timing; - int ret = -EIO; - - if (!allow_writes) - return -EACCES; - - if (mutex_lock_interruptible(&bfin_otp_lock)) - return -ERESTARTSYS; - - timing = bfin_otp_init_timing(); - if (timing) { - u32 otp_result = bfrom_OtpWrite(arg, OTP_LOCK, NULL); - stamp("locking page %lu resulted in 0x%x", arg, otp_result); - if (!(otp_result & OTP_MASTER_ERROR)) - ret = 0; - - bfin_otp_deinit_timing(timing); - } - - mutex_unlock(&bfin_otp_lock); - - return ret; - } - - case MEMLOCK: - allow_writes = false; - return 0; - - case MEMUNLOCK: - allow_writes = true; - return 0; - } - - return -EINVAL; -} -#else -# define bfin_otp_write NULL -# define bfin_otp_ioctl NULL -#endif - -static const struct file_operations bfin_otp_fops = { - .owner = THIS_MODULE, - .unlocked_ioctl = bfin_otp_ioctl, - .read = bfin_otp_read, - .write = bfin_otp_write, - .llseek = default_llseek, -}; - -static struct miscdevice bfin_otp_misc_device = { - .minor = MISC_DYNAMIC_MINOR, - .name = DRIVER_NAME, - .fops = &bfin_otp_fops, -}; -module_misc_device(bfin_otp_misc_device); - -MODULE_AUTHOR("Mike Frysinger <vapier@gentoo.org>"); -MODULE_DESCRIPTION("Blackfin OTP Memory Interface"); -MODULE_LICENSE("GPL"); diff --git a/drivers/char/ds1302.c b/drivers/char/ds1302.c deleted file mode 100644 index 8e16ad5d6d89..000000000000 --- a/drivers/char/ds1302.c +++ /dev/null @@ -1,357 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/*!*************************************************************************** -*! -*! FILE NAME : ds1302.c -*! -*! DESCRIPTION: Implements an interface for the DS1302 RTC -*! -*! Functions exported: ds1302_readreg, ds1302_writereg, ds1302_init, get_rtc_status -*! -*! --------------------------------------------------------------------------- -*! -*! (C) Copyright 1999, 2000, 2001 Axis Communications AB, LUND, SWEDEN -*! -*!***************************************************************************/ - - -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/mm.h> -#include <linux/module.h> -#include <linux/delay.h> -#include <linux/bcd.h> -#include <linux/mutex.h> -#include <linux/uaccess.h> -#include <linux/io.h> - -#include <asm/rtc.h> -#if defined(CONFIG_M32R) -#include <asm/m32r.h> -#endif - -#define RTC_MAJOR_NR 121 /* local major, change later */ - -static DEFINE_MUTEX(rtc_mutex); -static const char ds1302_name[] = "ds1302"; - -/* Send 8 bits. */ -static void -out_byte_rtc(unsigned int reg_addr, unsigned char x) -{ - //RST H - outw(0x0001,(unsigned long)PLD_RTCRSTODT); - //write data - outw(((x<<8)|(reg_addr&0xff)),(unsigned long)PLD_RTCWRDATA); - //WE - outw(0x0002,(unsigned long)PLD_RTCCR); - //wait - while(inw((unsigned long)PLD_RTCCR)); - - //RST L - outw(0x0000,(unsigned long)PLD_RTCRSTODT); - -} - -static unsigned char -in_byte_rtc(unsigned int reg_addr) -{ - unsigned char retval; - - //RST H - outw(0x0001,(unsigned long)PLD_RTCRSTODT); - //write data - outw((reg_addr&0xff),(unsigned long)PLD_RTCRDDATA); - //RE - outw(0x0001,(unsigned long)PLD_RTCCR); - //wait - while(inw((unsigned long)PLD_RTCCR)); - - //read data - retval=(inw((unsigned long)PLD_RTCRDDATA) & 0xff00)>>8; - - //RST L - outw(0x0000,(unsigned long)PLD_RTCRSTODT); - - return retval; -} - -/* Enable writing. */ - -static void -ds1302_wenable(void) -{ - out_byte_rtc(0x8e,0x00); -} - -/* Disable writing. */ - -static void -ds1302_wdisable(void) -{ - out_byte_rtc(0x8e,0x80); -} - - - -/* Read a byte from the selected register in the DS1302. */ - -unsigned char -ds1302_readreg(int reg) -{ - unsigned char x; - - x=in_byte_rtc((0x81 | (reg << 1))); /* read register */ - - return x; -} - -/* Write a byte to the selected register. */ - -void -ds1302_writereg(int reg, unsigned char val) -{ - ds1302_wenable(); - out_byte_rtc((0x80 | (reg << 1)),val); - ds1302_wdisable(); -} - -void -get_rtc_time(struct rtc_time *rtc_tm) -{ - unsigned long flags; - - local_irq_save(flags); - - rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS); - rtc_tm->tm_min = CMOS_READ(RTC_MINUTES); - rtc_tm->tm_hour = CMOS_READ(RTC_HOURS); - rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH); - rtc_tm->tm_mon = CMOS_READ(RTC_MONTH); - rtc_tm->tm_year = CMOS_READ(RTC_YEAR); - - local_irq_restore(flags); - - rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec); - rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min); - rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour); - rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday); - rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon); - rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year); - - /* - * Account for differences between how the RTC uses the values - * and how they are defined in a struct rtc_time; - */ - - if (rtc_tm->tm_year <= 69) - rtc_tm->tm_year += 100; - - rtc_tm->tm_mon--; -} - -static unsigned char days_in_mo[] = - {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; - -/* ioctl that supports RTC_RD_TIME and RTC_SET_TIME (read and set time/date). */ - -static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - unsigned long flags; - - switch(cmd) { - case RTC_RD_TIME: /* read the time/date from RTC */ - { - struct rtc_time rtc_tm; - - memset(&rtc_tm, 0, sizeof (struct rtc_time)); - mutex_lock(&rtc_mutex); - get_rtc_time(&rtc_tm); - mutex_unlock(&rtc_mutex); - if (copy_to_user((struct rtc_time*)arg, &rtc_tm, sizeof(struct rtc_time))) - return -EFAULT; - return 0; - } - - case RTC_SET_TIME: /* set the RTC */ - { - struct rtc_time rtc_tm; - unsigned char mon, day, hrs, min, sec, leap_yr; - unsigned int yrs; - - if (!capable(CAP_SYS_TIME)) - return -EPERM; - - if (copy_from_user(&rtc_tm, (struct rtc_time*)arg, sizeof(struct rtc_time))) - return -EFAULT; - - yrs = rtc_tm.tm_year + 1900; - mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ - day = rtc_tm.tm_mday; - hrs = rtc_tm.tm_hour; - min = rtc_tm.tm_min; - sec = rtc_tm.tm_sec; - - - if ((yrs < 1970) || (yrs > 2069)) - return -EINVAL; - - leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); - - if ((mon > 12) || (day == 0)) - return -EINVAL; - - if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) - return -EINVAL; - - if ((hrs >= 24) || (min >= 60) || (sec >= 60)) - return -EINVAL; - - if (yrs >= 2000) - yrs -= 2000; /* RTC (0, 1, ... 69) */ - else - yrs -= 1900; /* RTC (70, 71, ... 99) */ - - sec = bin2bcd(sec); - min = bin2bcd(min); - hrs = bin2bcd(hrs); - day = bin2bcd(day); - mon = bin2bcd(mon); - yrs = bin2bcd(yrs); - - mutex_lock(&rtc_mutex); - local_irq_save(flags); - CMOS_WRITE(yrs, RTC_YEAR); - CMOS_WRITE(mon, RTC_MONTH); - CMOS_WRITE(day, RTC_DAY_OF_MONTH); - CMOS_WRITE(hrs, RTC_HOURS); - CMOS_WRITE(min, RTC_MINUTES); - CMOS_WRITE(sec, RTC_SECONDS); - local_irq_restore(flags); - mutex_unlock(&rtc_mutex); - - /* Notice that at this point, the RTC is updated but - * the kernel is still running with the old time. - * You need to set that separately with settimeofday - * or adjtimex. - */ - return 0; - } - - case RTC_SET_CHARGE: /* set the RTC TRICKLE CHARGE register */ - { - int tcs_val; - - if (!capable(CAP_SYS_TIME)) - return -EPERM; - - if(copy_from_user(&tcs_val, (int*)arg, sizeof(int))) - return -EFAULT; - - mutex_lock(&rtc_mutex); - tcs_val = RTC_TCR_PATTERN | (tcs_val & 0x0F); - ds1302_writereg(RTC_TRICKLECHARGER, tcs_val); - mutex_unlock(&rtc_mutex); - return 0; - } - default: - return -EINVAL; - } -} - -int -get_rtc_status(char *buf) -{ - char *p; - struct rtc_time tm; - - p = buf; - - get_rtc_time(&tm); - - /* - * There is no way to tell if the luser has the RTC set for local - * time or for Universal Standard Time (GMT). Probably local though. - */ - - p += sprintf(p, - "rtc_time\t: %02d:%02d:%02d\n" - "rtc_date\t: %04d-%02d-%02d\n", - tm.tm_hour, tm.tm_min, tm.tm_sec, - tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday); - - return p - buf; -} - - -/* The various file operations we support. */ - -static const struct file_operations rtc_fops = { - .owner = THIS_MODULE, - .unlocked_ioctl = rtc_ioctl, - .llseek = noop_llseek, -}; - -/* Probe for the chip by writing something to its RAM and try reading it back. */ - -#define MAGIC_PATTERN 0x42 - -static int __init -ds1302_probe(void) -{ - int retval, res, baur; - - baur=(boot_cpu_data.bus_clock/(2*1000*1000)); - - printk("%s: Set PLD_RTCBAUR = %d\n", ds1302_name,baur); - - outw(0x0000,(unsigned long)PLD_RTCCR); - outw(0x0000,(unsigned long)PLD_RTCRSTODT); - outw(baur,(unsigned long)PLD_RTCBAUR); - - /* Try to talk to timekeeper. */ - - ds1302_wenable(); - /* write RAM byte 0 */ - /* write something magic */ - out_byte_rtc(0xc0,MAGIC_PATTERN); - - /* read RAM byte 0 */ - if((res = in_byte_rtc(0xc1)) == MAGIC_PATTERN) { - char buf[100]; - ds1302_wdisable(); - printk("%s: RTC found.\n", ds1302_name); - get_rtc_status(buf); - printk(buf); - retval = 1; - } else { - printk("%s: RTC not found.\n", ds1302_name); - retval = 0; - } - - return retval; -} - - -/* Just probe for the RTC and register the device to handle the ioctl needed. */ - -int __init -ds1302_init(void) -{ - if (!ds1302_probe()) { - return -1; - } - return 0; -} - -static int __init ds1302_register(void) -{ - ds1302_init(); - if (register_chrdev(RTC_MAJOR_NR, ds1302_name, &rtc_fops)) { - printk(KERN_INFO "%s: unable to get major %d for rtc\n", - ds1302_name, RTC_MAJOR_NR); - return -1; - } - return 0; -} - -module_init(ds1302_register); diff --git a/drivers/char/tile-srom.c b/drivers/char/tile-srom.c deleted file mode 100644 index 3d4cca64b2d4..000000000000 --- a/drivers/char/tile-srom.c +++ /dev/null @@ -1,475 +0,0 @@ -/* - * Copyright 2011 Tilera Corporation. All Rights Reserved. - * - * 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, version 2. - * - * 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, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - * - * SPI Flash ROM driver - * - * This source code is derived from code provided in "Linux Device - * Drivers, Third Edition", by Jonathan Corbet, Alessandro Rubini, and - * Greg Kroah-Hartman, published by O'Reilly Media, Inc. - */ - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/kernel.h> /* printk() */ -#include <linux/slab.h> /* kmalloc() */ -#include <linux/fs.h> /* everything... */ -#include <linux/errno.h> /* error codes */ -#include <linux/types.h> /* size_t */ -#include <linux/proc_fs.h> -#include <linux/fcntl.h> /* O_ACCMODE */ -#include <linux/pagemap.h> -#include <linux/hugetlb.h> -#include <linux/uaccess.h> -#include <linux/platform_device.h> -#include <hv/hypervisor.h> -#include <linux/ioctl.h> -#include <linux/cdev.h> -#include <linux/delay.h> -#include <hv/drv_srom_intf.h> - -/* - * Size of our hypervisor I/O requests. We break up large transfers - * so that we don't spend large uninterrupted spans of time in the - * hypervisor. Erasing an SROM sector takes a significant fraction of - * a second, so if we allowed the user to, say, do one I/O to write the - * entire ROM, we'd get soft lockup timeouts, or worse. - */ -#define SROM_CHUNK_SIZE ((size_t)4096) - -/* - * When hypervisor is busy (e.g. erasing), poll the status periodically. - */ - -/* - * Interval to poll the state in msec - */ -#define SROM_WAIT_TRY_INTERVAL 20 - -/* - * Maximum times to poll the state - */ -#define SROM_MAX_WAIT_TRY_TIMES 1000 - -struct srom_dev { - int hv_devhdl; /* Handle for hypervisor device */ - u32 total_size; /* Size of this device */ - u32 sector_size; /* Size of a sector */ - u32 page_size; /* Size of a page */ - struct mutex lock; /* Allow only one accessor at a time */ -}; - -static int srom_major; /* Dynamic major by default */ -module_param(srom_major, int, 0); -MODULE_AUTHOR("Tilera Corporation"); -MODULE_LICENSE("GPL"); - -static int srom_devs; /* Number of SROM partitions */ -static struct cdev srom_cdev; -static struct platform_device *srom_parent; -static struct class *srom_class; -static struct srom_dev *srom_devices; - -/* - * Handle calling the hypervisor and managing EAGAIN/EBUSY. - */ - -static ssize_t _srom_read(int hv_devhdl, void *buf, - loff_t off, size_t count) -{ - int retval, retries = SROM_MAX_WAIT_TRY_TIMES; - for (;;) { - retval = hv_dev_pread(hv_devhdl, 0, (HV_VirtAddr)buf, - count, off); - if (retval >= 0) - return retval; - if (retval == HV_EAGAIN) - continue; - if (retval == HV_EBUSY && --retries > 0) { - msleep(SROM_WAIT_TRY_INTERVAL); - continue; - } - pr_err("_srom_read: error %d\n", retval); - return -EIO; - } -} - -static ssize_t _srom_write(int hv_devhdl, const void *buf, - loff_t off, size_t count) -{ - int retval, retries = SROM_MAX_WAIT_TRY_TIMES; - for (;;) { - retval = hv_dev_pwrite(hv_devhdl, 0, (HV_VirtAddr)buf, - count, off); - if (retval >= 0) - return retval; - if (retval == HV_EAGAIN) - continue; - if (retval == HV_EBUSY && --retries > 0) { - msleep(SROM_WAIT_TRY_INTERVAL); - continue; - } - pr_err("_srom_write: error %d\n", retval); - return -EIO; - } -} - -/** - * srom_open() - Device open routine. - * @inode: Inode for this device. - * @filp: File for this specific open of the device. - * - * Returns zero, or an error code. - */ -static int srom_open(struct inode *inode, struct file *filp) -{ - filp->private_data = &srom_devices[iminor(inode)]; - return 0; -} - - -/** - * srom_release() - Device release routine. - * @inode: Inode for this device. - * @filp: File for this specific open of the device. - * - * Returns zero, or an error code. - */ -static int srom_release(struct inode *inode, struct file *filp) -{ - struct srom_dev *srom = filp->private_data; - char dummy; - - /* Make sure we've flushed anything written to the ROM. */ - mutex_lock(&srom->lock); - if (srom->hv_devhdl >= 0) - _srom_write(srom->hv_devhdl, &dummy, SROM_FLUSH_OFF, 1); - mutex_unlock(&srom->lock); - - filp->private_data = NULL; - - return 0; -} - - -/** - * srom_read() - Read data from the device. - * @filp: File for this specific open of the device. - * @buf: User's data buffer. - * @count: Number of bytes requested. - * @f_pos: File position. - * - * Returns number of bytes read, or an error code. - */ -static ssize_t srom_read(struct file *filp, char __user *buf, - size_t count, loff_t *f_pos) -{ - int retval = 0; - void *kernbuf; - struct srom_dev *srom = filp->private_data; - - kernbuf = kmalloc(SROM_CHUNK_SIZE, GFP_KERNEL); - if (!kernbuf) - return -ENOMEM; - - if (mutex_lock_interruptible(&srom->lock)) { - retval = -ERESTARTSYS; - kfree(kernbuf); - return retval; - } - - while (count) { - int hv_retval; - int bytes_this_pass = min(count, SROM_CHUNK_SIZE); - - hv_retval = _srom_read(srom->hv_devhdl, kernbuf, - *f_pos, bytes_this_pass); - if (hv_retval <= 0) { - if (retval == 0) - retval = hv_retval; - break; - } - - if (copy_to_user(buf, kernbuf, hv_retval) != 0) { - retval = -EFAULT; - break; - } - - retval += hv_retval; - *f_pos += hv_retval; - buf += hv_retval; - count -= hv_retval; - } - - mutex_unlock(&srom->lock); - kfree(kernbuf); - - return retval; -} - -/** - * srom_write() - Write data to the device. - * @filp: File for this specific open of the device. - * @buf: User's data buffer. - * @count: Number of bytes requested. - * @f_pos: File position. - * - * Returns number of bytes written, or an error code. - */ -static ssize_t srom_write(struct file *filp, const char __user *buf, - size_t count, loff_t *f_pos) -{ - int retval = 0; - void *kernbuf; - struct srom_dev *srom = filp->private_data; - - kernbuf = kmalloc(SROM_CHUNK_SIZE, GFP_KERNEL); - if (!kernbuf) - return -ENOMEM; - - if (mutex_lock_interruptible(&srom->lock)) { - retval = -ERESTARTSYS; - kfree(kernbuf); - return retval; - } - - while (count) { - int hv_retval; - int bytes_this_pass = min(count, SROM_CHUNK_SIZE); - - if (copy_from_user(kernbuf, buf, bytes_this_pass) != 0) { - retval = -EFAULT; - break; - } - - hv_retval = _srom_write(srom->hv_devhdl, kernbuf, - *f_pos, bytes_this_pass); - if (hv_retval <= 0) { - if (retval == 0) - retval = hv_retval; - break; - } - - retval += hv_retval; - *f_pos += hv_retval; - buf += hv_retval; - count -= hv_retval; - } - - mutex_unlock(&srom->lock); - kfree(kernbuf); - - return retval; -} - -/* Provide our own implementation so we can use srom->total_size. */ -loff_t srom_llseek(struct file *file, loff_t offset, int origin) -{ - struct srom_dev *srom = file->private_data; - return fixed_size_llseek(file, offset, origin, srom->total_size); -} - -static ssize_t total_size_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct srom_dev *srom = dev_get_drvdata(dev); - return sprintf(buf, "%u\n", srom->total_size); -} -static DEVICE_ATTR_RO(total_size); - -static ssize_t sector_size_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct srom_dev *srom = dev_get_drvdata(dev); - return sprintf(buf, "%u\n", srom->sector_size); -} -static DEVICE_ATTR_RO(sector_size); - -static ssize_t page_size_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct srom_dev *srom = dev_get_drvdata(dev); - return sprintf(buf, "%u\n", srom->page_size); -} -static DEVICE_ATTR_RO(page_size); - -static struct attribute *srom_dev_attrs[] = { - &dev_attr_total_size.attr, - &dev_attr_sector_size.attr, - &dev_attr_page_size.attr, - NULL, -}; -ATTRIBUTE_GROUPS(srom_dev); - -static char *srom_devnode(struct device *dev, umode_t *mode) -{ - if (mode) - *mode = 0644; - return kasprintf(GFP_KERNEL, "srom/%s", dev_name(dev)); -} - -/* - * The fops - */ -static const struct file_operations srom_fops = { - .owner = THIS_MODULE, - .llseek = srom_llseek, - .read = srom_read, - .write = srom_write, - .open = srom_open, - .release = srom_release, -}; - -/** - * srom_setup_minor() - Initialize per-minor information. - * @srom: Per-device SROM state. - * @devhdl: Partition device handle. - */ -static int srom_setup_minor(struct srom_dev *srom, int devhdl) -{ - srom->hv_devhdl = devhdl; - mutex_init(&srom->lock); - - if (_srom_read(devhdl, &srom->total_size, - SROM_TOTAL_SIZE_OFF, sizeof(srom->total_size)) < 0) - return -EIO; - if (_srom_read(devhdl, &srom->sector_size, - SROM_SECTOR_SIZE_OFF, sizeof(srom->sector_size)) < 0) - return -EIO; - if (_srom_read(devhdl, &srom->page_size, - SROM_PAGE_SIZE_OFF, sizeof(srom->page_size)) < 0) - return -EIO; - - return 0; -} - -/** srom_init() - Initialize the driver's module. */ -static int srom_init(void) -{ - int result, i; - dev_t dev = MKDEV(srom_major, 0); - - /* - * Start with a plausible number of partitions; the krealloc() call - * below will yield about log(srom_devs) additional allocations. - */ - srom_devices = kmalloc(4 * sizeof(struct srom_dev), GFP_KERNEL); - - /* Discover the number of srom partitions. */ - for (i = 0; ; i++) { - int devhdl; - char buf[20]; - struct srom_dev *new_srom_devices = - krealloc(srom_devices, (i+1) * sizeof(struct srom_dev), - GFP_KERNEL); - if (!new_srom_devices) { - result = -ENOMEM; - goto fail_mem; - } - srom_devices = new_srom_devices; - sprintf(buf, "srom/0/%d", i); - devhdl = hv_dev_open((HV_VirtAddr)buf, 0); - if (devhdl < 0) { - if (devhdl != HV_ENODEV) - pr_notice("srom/%d: hv_dev_open failed: %d.\n", - i, devhdl); - break; - } - result = srom_setup_minor(&srom_devices[i], devhdl); - if (result != 0) - goto fail_mem; - } - srom_devs = i; - - /* Bail out early if we have no partitions at all. */ - if (srom_devs == 0) { - result = -ENODEV; - goto fail_mem; - } - - /* Register our major, and accept a dynamic number. */ - if (srom_major) - result = register_chrdev_region(dev, srom_devs, "srom"); - else { - result = alloc_chrdev_region(&dev, 0, srom_devs, "srom"); - srom_major = MAJOR(dev); - } - if (result < 0) - goto fail_mem; - - /* Register a character device. */ - cdev_init(&srom_cdev, &srom_fops); - srom_cdev.owner = THIS_MODULE; - srom_cdev.ops = &srom_fops; - result = cdev_add(&srom_cdev, dev, srom_devs); - if (result < 0) - goto fail_chrdev; - - /* Create a parent device */ - srom_parent = platform_device_register_simple("srom", -1, NULL, 0); - if (IS_ERR(srom_parent)) { - result = PTR_ERR(srom_parent); - goto fail_pdev; - } - - /* Create a sysfs class. */ - srom_class = class_create(THIS_MODULE, "srom"); - if (IS_ERR(srom_class)) { - result = PTR_ERR(srom_class); - goto fail_cdev; - } - srom_class->dev_groups = srom_dev_groups; - srom_class->devnode = srom_devnode; - - /* Create per-partition devices */ - for (i = 0; i < srom_devs; i++) { - struct device *dev = - device_create(srom_class, &srom_parent->dev, - MKDEV(srom_major, i), srom_devices + i, - "%d", i); - result = PTR_ERR_OR_ZERO(dev); - if (result < 0) - goto fail_class; - } - - return 0; - -fail_class: - for (i = 0; i < srom_devs; i++) - device_destroy(srom_class, MKDEV(srom_major, i)); - class_destroy(srom_class); -fail_cdev: - platform_device_unregister(srom_parent); -fail_pdev: - cdev_del(&srom_cdev); -fail_chrdev: - unregister_chrdev_region(dev, srom_devs); -fail_mem: - kfree(srom_devices); - return result; -} - -/** srom_cleanup() - Clean up the driver's module. */ -static void srom_cleanup(void) -{ - int i; - for (i = 0; i < srom_devs; i++) - device_destroy(srom_class, MKDEV(srom_major, i)); - class_destroy(srom_class); - cdev_del(&srom_cdev); - platform_device_unregister(srom_parent); - unregister_chrdev_region(MKDEV(srom_major, 0), srom_devs); - kfree(srom_devices); -} - -module_init(srom_init); -module_exit(srom_cleanup); |