From patchwork Sat Jul 25 07:46:03 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Finn Thain X-Patchwork-Id: 6864881 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 11CC7C05AC for ; Sat, 25 Jul 2015 08:04:33 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1F9C020761 for ; Sat, 25 Jul 2015 08:04:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4619220783 for ; Sat, 25 Jul 2015 08:04:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992467AbbGYID3 (ORCPT ); Sat, 25 Jul 2015 04:03:29 -0400 Received: from kvm5.telegraphics.com.au ([98.124.60.144]:42372 "EHLO kvm5.telegraphics.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754941AbbGYH4t (ORCPT ); Sat, 25 Jul 2015 03:56:49 -0400 Received: by kvm5.telegraphics.com.au (Postfix, from userid 502) id 0702B2944B; Sat, 25 Jul 2015 03:56:47 -0400 (EDT) Message-Id: <20150725074600.523330379@telegraphics.com.au> User-Agent: quilt/0.50-1 Date: Sat, 25 Jul 2015 17:46:03 +1000 From: Finn Thain To: , , , Geert Uytterhoeven , Michael Schmitz , "James E.J. Bottomley" , linux-scsi@vger.kernel.org Subject: [RFC v5 04/26] m68k/atari: Replace nvram_{read, write}_byte with arch_nvram_ops References: <20150725074559.543547894@telegraphics.com.au> Content-Disposition: inline; filename=atari_scsi-convert-to-nvram_ops Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Spam-Status: No, score=-8.1 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP By implementing an arch_nvram_ops struct, any platform can re-use the drivers/char/nvram module without needing any arch-specific code in that module. Atari does so here. Atari has one user of nvram_check_checksum() whereas the other platforms (i.e. x86 and ARM platforms) have none at all. Replace this validate-checksum-and-read-byte sequence with the equivalent rtc_nvram_ops.read() call and remove the now unused functions. Signed-off-by: Finn Thain Tested-by: Christian T. Steigies --- The advantage of the new ops struct over the old global nvram_* functions is that the misc device module can be shared by different platforms without requiring every platform to implement every nvram_* function. E.g. only RTC "CMOS" NVRAMs have a checksum for the entire NVRAM and only PowerPC platforms have a "sync" ioctl. --- arch/m68k/atari/nvram.c | 89 ++++++++++++++++++++++++++++------------------ drivers/scsi/atari_scsi.c | 8 ++-- include/linux/nvram.h | 9 ++++ 3 files changed, 70 insertions(+), 36 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux/arch/m68k/atari/nvram.c =================================================================== --- linux.orig/arch/m68k/atari/nvram.c 2015-07-25 17:45:26.000000000 +1000 +++ linux/arch/m68k/atari/nvram.c 2015-07-25 17:45:28.000000000 +1000 @@ -38,33 +38,12 @@ unsigned char __nvram_read_byte(int i) return CMOS_READ(NVRAM_FIRST_BYTE + i); } -unsigned char nvram_read_byte(int i) -{ - unsigned long flags; - unsigned char c; - - spin_lock_irqsave(&rtc_lock, flags); - c = __nvram_read_byte(i); - spin_unlock_irqrestore(&rtc_lock, flags); - return c; -} -EXPORT_SYMBOL(nvram_read_byte); - /* This races nicely with trying to read with checksum checking */ void __nvram_write_byte(unsigned char c, int i) { CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); } -void nvram_write_byte(unsigned char c, int i) -{ - unsigned long flags; - - spin_lock_irqsave(&rtc_lock, flags); - __nvram_write_byte(c, i); - spin_unlock_irqrestore(&rtc_lock, flags); -} - /* On Ataris, the checksum is over all bytes except the checksum bytes * themselves; these are at the very end. */ @@ -83,18 +62,6 @@ int __nvram_check_checksum(void) (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); } -int nvram_check_checksum(void) -{ - unsigned long flags; - int rv; - - spin_lock_irqsave(&rtc_lock, flags); - rv = __nvram_check_checksum(); - spin_unlock_irqrestore(&rtc_lock, flags); - return rv; -} -EXPORT_SYMBOL(nvram_check_checksum); - static void __nvram_set_checksum(void) { int i; @@ -106,6 +73,62 @@ static void __nvram_set_checksum(void) __nvram_write_byte(sum, ATARI_CKS_LOC + 1); } +static ssize_t nvram_read(char *buf, size_t count, loff_t *ppos) +{ + char *p = buf; + loff_t i; + + spin_lock_irq(&rtc_lock); + + if (!__nvram_check_checksum()) { + spin_unlock_irq(&rtc_lock); + return -EIO; + } + + for (i = *ppos; count > 0 && i < NVRAM_BYTES; --count, ++i, ++p) + *p = __nvram_read_byte(i); + + spin_unlock_irq(&rtc_lock); + + *ppos = i; + return p - buf; +} + +static ssize_t nvram_write(char *buf, size_t count, loff_t *ppos) +{ + char *p = buf; + loff_t i; + + spin_lock_irq(&rtc_lock); + + if (!__nvram_check_checksum()) { + spin_unlock_irq(&rtc_lock); + return -EIO; + } + + for (i = *ppos; count > 0 && i < NVRAM_BYTES; --count, ++i, ++p) + __nvram_write_byte(*p, i); + + __nvram_set_checksum(); + + spin_unlock_irq(&rtc_lock); + + *ppos = i; + return p - buf; +} + +static ssize_t nvram_get_size(void) +{ + return NVRAM_BYTES; +} + +const struct nvram_ops arch_nvram_ops = { + .read = nvram_read, + .write = nvram_write, + .get_size = nvram_get_size, +}; +EXPORT_SYMBOL(arch_nvram_ops); + #ifdef CONFIG_PROC_FS static struct { unsigned char val; Index: linux/drivers/scsi/atari_scsi.c =================================================================== --- linux.orig/drivers/scsi/atari_scsi.c 2015-07-25 17:45:24.000000000 +1000 +++ linux/drivers/scsi/atari_scsi.c 2015-07-25 17:45:28.000000000 +1000 @@ -880,13 +880,15 @@ static int __init atari_scsi_probe(struc #ifdef CONFIG_NVRAM else /* Test if a host id is set in the NVRam */ - if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) { - unsigned char b = nvram_read_byte(14); + if (ATARIHW_PRESENT(TT_CLK)) { + unsigned char b; + loff_t offset = 14; + ssize_t count = arch_nvram_ops.read(&b, 1, &offset); /* Arbitration enabled? (for TOS) * If yes, use configured host ID */ - if (b & 0x80) + if ((count == 1) && (b & 0x80)) atari_scsi_template.this_id = b & 7; } #endif Index: linux/include/linux/nvram.h =================================================================== --- linux.orig/include/linux/nvram.h 2015-07-25 17:42:34.000000000 +1000 +++ linux/include/linux/nvram.h 2015-07-25 17:45:28.000000000 +1000 @@ -10,4 +10,13 @@ extern void __nvram_write_byte(unsigned extern void nvram_write_byte(unsigned char c, int i); extern int __nvram_check_checksum(void); extern int nvram_check_checksum(void); + +struct nvram_ops { + ssize_t (*read)(char *, size_t, loff_t *); + ssize_t (*write)(char *, size_t, loff_t *); + ssize_t (*get_size)(void); +}; + +extern const struct nvram_ops arch_nvram_ops; + #endif /* _LINUX_NVRAM_H */