Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: arch/tile/mm/init.c: trivial: use BUG_ON arch/tile: remove useless set_fixmap_nocache() macro arch/tile: add hypervisor-based character driver for SPI flash ROM ioctl-number.txt: add the tile hardwall ioctl range tile: use generic-y format for one-line asm-generic headers clocksource: tile: convert to use clocksource_register_hz
This commit is contained in:
Linus Torvalds
commit
1850536b93
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@ -292,6 +292,7 @@ Code Seq#(hex) Include File Comments
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|||
<mailto:buk@buks.ipn.de>
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||||
0xA0 all linux/sdp/sdp.h Industrial Device Project
|
||||
<mailto:kenji@bitgate.com>
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||||
0xA2 00-0F arch/tile/include/asm/hardwall.h
|
||||
0xA3 80-8F Port ACL in development:
|
||||
<mailto:tlewis@mindspring.com>
|
||||
0xA3 90-9F linux/dtlk.h
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||||
|
|
|
|||
|
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@ -2,3 +2,41 @@ include include/asm-generic/Kbuild.asm
|
|||
|
||||
header-y += ucontext.h
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||||
header-y += hardwall.h
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||||
|
||||
generic-y += bug.h
|
||||
generic-y += bugs.h
|
||||
generic-y += cputime.h
|
||||
generic-y += device.h
|
||||
generic-y += div64.h
|
||||
generic-y += emergency-restart.h
|
||||
generic-y += errno.h
|
||||
generic-y += fb.h
|
||||
generic-y += fcntl.h
|
||||
generic-y += ioctl.h
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||||
generic-y += ioctls.h
|
||||
generic-y += ipc.h
|
||||
generic-y += ipcbuf.h
|
||||
generic-y += irq_regs.h
|
||||
generic-y += kdebug.h
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||||
generic-y += local.h
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||||
generic-y += module.h
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||||
generic-y += msgbuf.h
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||||
generic-y += mutex.h
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||||
generic-y += param.h
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||||
generic-y += parport.h
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||||
generic-y += poll.h
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||||
generic-y += posix_types.h
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||||
generic-y += resource.h
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||||
generic-y += scatterlist.h
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||||
generic-y += sembuf.h
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||||
generic-y += serial.h
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||||
generic-y += shmbuf.h
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||||
generic-y += shmparam.h
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||||
generic-y += socket.h
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||||
generic-y += sockios.h
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||||
generic-y += statfs.h
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||||
generic-y += termbits.h
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||||
generic-y += termios.h
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||||
generic-y += types.h
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||||
generic-y += ucontext.h
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||||
generic-y += xor.h
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||||
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|
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@ -1 +0,0 @@
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#include <asm-generic/bug.h>
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|
|
@ -1 +0,0 @@
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#include <asm-generic/bugs.h>
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||||
|
|
@ -1 +0,0 @@
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#include <asm-generic/cputime.h>
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|
|
@ -1 +0,0 @@
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#include <asm-generic/device.h>
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|
@ -1 +0,0 @@
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#include <asm-generic/div64.h>
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@ -1 +0,0 @@
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#include <asm-generic/emergency-restart.h>
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@ -1 +0,0 @@
|
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#include <asm-generic/errno.h>
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|
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@ -1 +0,0 @@
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#include <asm-generic/fb.h>
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@ -1 +0,0 @@
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#include <asm-generic/fcntl.h>
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@ -75,12 +75,6 @@ extern void __set_fixmap(enum fixed_addresses idx,
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#define set_fixmap(idx, phys) \
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__set_fixmap(idx, phys, PAGE_KERNEL)
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/*
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* Some hardware wants to get fixmapped without caching.
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*/
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#define set_fixmap_nocache(idx, phys) \
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__set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
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#define clear_fixmap(idx) \
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__set_fixmap(idx, 0, __pgprot(0))
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|
|
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|
|
@ -1 +0,0 @@
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#include <asm-generic/ioctl.h>
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|
@ -1 +0,0 @@
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#include <asm-generic/ioctls.h>
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|
@ -1 +0,0 @@
|
|||
#include <asm-generic/ipc.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/ipcbuf.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/irq_regs.h>
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||||
|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/kdebug.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/local.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/module.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/msgbuf.h>
|
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/mutex-dec.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/param.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/parport.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/poll.h>
|
||||
|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/posix_types.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/resource.h>
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||||
|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/scatterlist.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/sembuf.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/serial.h>
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|
|
@ -1 +0,0 @@
|
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#include <asm-generic/shmbuf.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/shmparam.h>
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||||
|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/socket.h>
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||||
|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/sockios.h>
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||||
|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/statfs.h>
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||||
|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/termbits.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/termios.h>
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||||
|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/types.h>
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|
|
@ -1 +0,0 @@
|
|||
#include <asm-generic/ucontext.h>
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@ -1 +0,0 @@
|
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#include <asm-generic/xor.h>
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|
@ -0,0 +1,41 @@
|
|||
/*
|
||||
* Copyright 2011 Tilera Corporation. All Rights Reserved.
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||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
/**
|
||||
* @file drv_srom_intf.h
|
||||
* Interface definitions for the SPI Flash ROM driver.
|
||||
*/
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||||
|
||||
#ifndef _SYS_HV_INCLUDE_DRV_SROM_INTF_H
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#define _SYS_HV_INCLUDE_DRV_SROM_INTF_H
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||||
|
||||
/** Read this offset to get the total device size. */
|
||||
#define SROM_TOTAL_SIZE_OFF 0xF0000000
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||||
|
||||
/** Read this offset to get the device sector size. */
|
||||
#define SROM_SECTOR_SIZE_OFF 0xF0000004
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||||
|
||||
/** Read this offset to get the device page size. */
|
||||
#define SROM_PAGE_SIZE_OFF 0xF0000008
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||||
|
||||
/** Write this offset to flush any pending writes. */
|
||||
#define SROM_FLUSH_OFF 0xF1000000
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||||
|
||||
/** Write this offset, plus the byte offset of the start of a sector, to
|
||||
* erase a sector. Any write data is ignored, but there must be at least
|
||||
* one byte of write data. Only applies when the driver is in MTD mode.
|
||||
*/
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||||
#define SROM_ERASE_OFF 0xF2000000
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||||
|
||||
#endif /* _SYS_HV_INCLUDE_DRV_SROM_INTF_H */
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||||
|
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@ -78,7 +78,6 @@ static struct clocksource cycle_counter_cs = {
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.rating = 300,
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||||
.read = clocksource_get_cycles,
|
||||
.mask = CLOCKSOURCE_MASK(64),
|
||||
.shift = 22, /* typical value, e.g. x86 tsc uses this */
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||||
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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||||
};
|
||||
|
||||
|
|
@ -91,8 +90,6 @@ void __init setup_clock(void)
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|||
cycles_per_sec = hv_sysconf(HV_SYSCONF_CPU_SPEED);
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||||
sched_clock_mult =
|
||||
clocksource_hz2mult(cycles_per_sec, SCHED_CLOCK_SHIFT);
|
||||
cycle_counter_cs.mult =
|
||||
clocksource_hz2mult(cycles_per_sec, cycle_counter_cs.shift);
|
||||
}
|
||||
|
||||
void __init calibrate_delay(void)
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|
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@ -107,7 +104,7 @@ void __init calibrate_delay(void)
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void __init time_init(void)
|
||||
{
|
||||
/* Initialize and register the clock source. */
|
||||
clocksource_register(&cycle_counter_cs);
|
||||
clocksource_register_hz(&cycle_counter_cs, cycles_per_sec);
|
||||
|
||||
/* Start up the tile-timer interrupt source on the boot cpu. */
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||||
setup_tile_timer();
|
||||
|
|
|
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|
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@ -836,8 +836,7 @@ void __init mem_init(void)
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|||
#endif
|
||||
|
||||
#ifdef CONFIG_FLATMEM
|
||||
if (!mem_map)
|
||||
BUG();
|
||||
BUG_ON(!mem_map);
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
|
|
|
|||
|
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@ -616,5 +616,16 @@ config MSM_SMD_PKT
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|||
Enables userspace clients to read and write to some packet SMD
|
||||
ports via device interface for MSM chipset.
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||||
|
||||
config TILE_SROM
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bool "Character-device access via hypervisor to the Tilera SPI ROM"
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depends on TILE
|
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default y
|
||||
---help---
|
||||
This device provides character-level read-write access
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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.
|
||||
|
||||
endmenu
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|
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|
|
|
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|
|
@ -63,3 +63,5 @@ obj-$(CONFIG_RAMOOPS) += ramoops.o
|
|||
|
||||
obj-$(CONFIG_JS_RTC) += js-rtc.o
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js-rtc-y = rtc.o
|
||||
|
||||
obj-$(CONFIG_TILE_SROM) += tile-srom.o
|
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|
|
|
|||
|
|
@ -0,0 +1,481 @@
|
|||
/*
|
||||
* 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/init.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/aio.h>
|
||||
#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 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 (copy_to_user(buf, kernbuf, hv_retval) != 0) {
|
||||
retval = -EFAULT;
|
||||
break;
|
||||
}
|
||||
} else 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;
|
||||
}
|
||||
|
||||
/**
|
||||
* 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 *filp, loff_t offset, int origin)
|
||||
{
|
||||
struct srom_dev *srom = filp->private_data;
|
||||
|
||||
if (mutex_lock_interruptible(&srom->lock))
|
||||
return -ERESTARTSYS;
|
||||
|
||||
switch (origin) {
|
||||
case SEEK_END:
|
||||
offset += srom->total_size;
|
||||
break;
|
||||
case SEEK_CUR:
|
||||
offset += filp->f_pos;
|
||||
break;
|
||||
}
|
||||
|
||||
if (offset < 0 || offset > srom->total_size) {
|
||||
offset = -EINVAL;
|
||||
} else {
|
||||
filp->f_pos = offset;
|
||||
filp->f_version = 0;
|
||||
}
|
||||
|
||||
mutex_unlock(&srom->lock);
|
||||
|
||||
return offset;
|
||||
}
|
||||
|
||||
static ssize_t total_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 ssize_t sector_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 ssize_t page_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 struct device_attribute srom_dev_attrs[] = {
|
||||
__ATTR(total_size, S_IRUGO, total_show, NULL),
|
||||
__ATTR(sector_size, S_IRUGO, sector_show, NULL),
|
||||
__ATTR(page_size, S_IRUGO, page_show, NULL),
|
||||
__ATTR_NULL
|
||||
};
|
||||
|
||||
static char *srom_devnode(struct device *dev, mode_t *mode)
|
||||
{
|
||||
*mode = S_IRUGO | S_IWUSR;
|
||||
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.
|
||||
* @index: Device to set up.
|
||||
*/
|
||||
static int srom_setup_minor(struct srom_dev *srom, int index)
|
||||
{
|
||||
struct device *dev;
|
||||
int devhdl = srom->hv_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;
|
||||
|
||||
dev = device_create(srom_class, &platform_bus,
|
||||
MKDEV(srom_major, index), srom, "%d", index);
|
||||
return IS_ERR(dev) ? PTR_ERR(dev) : 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 = kzalloc(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 | __GFP_ZERO);
|
||||
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;
|
||||
}
|
||||
srom_devices[i].hv_devhdl = devhdl;
|
||||
}
|
||||
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 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_attrs = srom_dev_attrs;
|
||||
srom_class->devnode = srom_devnode;
|
||||
|
||||
/* Do per-partition initialization */
|
||||
for (i = 0; i < srom_devs; i++) {
|
||||
result = srom_setup_minor(srom_devices + i, i);
|
||||
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:
|
||||
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);
|
||||
unregister_chrdev_region(MKDEV(srom_major, 0), srom_devs);
|
||||
kfree(srom_devices);
|
||||
}
|
||||
|
||||
module_init(srom_init);
|
||||
module_exit(srom_cleanup);
|
||||
Reference in New Issue