From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45499C43387 for ; Wed, 26 Dec 2018 00:45:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 156742148E for ; Wed, 26 Dec 2018 00:45:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726601AbeLZAoB (ORCPT ); Tue, 25 Dec 2018 19:44:01 -0500 Received: from kvm5.telegraphics.com.au ([98.124.60.144]:57162 "EHLO kvm5.telegraphics.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725932AbeLZAn6 (ORCPT ); Tue, 25 Dec 2018 19:43:58 -0500 Received: by kvm5.telegraphics.com.au (Postfix, from userid 502) id B457529505; Tue, 25 Dec 2018 19:43:55 -0500 (EST) To: Arnd Bergmann , Greg Kroah-Hartman , Geert Uytterhoeven , Michael Schmitz , "James E.J. Bottomley" , "Martin K. Petersen" Cc: linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linuxppc-dev@lists.ozlabs.org, linux-scsi@vger.kernel.org Message-Id: <0e72ee3231529ab642f6aea94cb93644689e79b5.1545784679.git.fthain@telegraphics.com.au> In-Reply-To: References: From: Finn Thain Subject: [PATCH v8 03/25] m68k/atari: Replace nvram_{read,write}_byte with arch_nvram_ops Date: Wed, 26 Dec 2018 11:37:59 +1100 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org By implementing an arch_nvram_ops struct, any platform can re-use the drivers/char/nvram.c 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 "CMOS" platforms don't use that function 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 Acked-by: Geert Uytterhoeven --- 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(-) diff --git a/arch/m68k/atari/nvram.c b/arch/m68k/atari/nvram.c index 3e620ee955ba..bafc9dc32830 100644 --- a/arch/m68k/atari/nvram.c +++ b/arch/m68k/atari/nvram.c @@ -39,33 +39,12 @@ 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. */ @@ -84,18 +63,6 @@ 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; @@ -107,6 +74,62 @@ 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; diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c index 99e5729d910d..f55d13e400da 100644 --- a/drivers/scsi/atari_scsi.c +++ b/drivers/scsi/atari_scsi.c @@ -760,13 +760,15 @@ static int __init atari_scsi_probe(struct platform_device *pdev) #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(16); + if (ATARIHW_PRESENT(TT_CLK)) { + unsigned char b; + loff_t offset = 16; + 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 diff --git a/include/linux/nvram.h b/include/linux/nvram.h index 28bfb9ab94ca..4f78147e74d9 100644 --- a/include/linux/nvram.h +++ b/include/linux/nvram.h @@ -11,4 +11,13 @@ extern void __nvram_write_byte(unsigned char c, int i); 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 */ -- 2.19.2 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8EB19C43387 for ; Wed, 26 Dec 2018 05:27:05 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 06E1C214D8 for ; Wed, 26 Dec 2018 05:27:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 06E1C214D8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=telegraphics.com.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 43PhKz0J4DzDqLv for ; Wed, 26 Dec 2018 16:27:03 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=telegraphics.com.au Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=telegraphics.com.au (client-ip=98.124.60.144; helo=kvm5.telegraphics.com.au; envelope-from=fthain@telegraphics.com.au; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=telegraphics.com.au Received: from kvm5.telegraphics.com.au (kvm5.telegraphics.com.au [98.124.60.144]) by lists.ozlabs.org (Postfix) with ESMTP id 43Pgn05RhjzDqHn for ; Wed, 26 Dec 2018 16:01:56 +1100 (AEDT) Received: by kvm5.telegraphics.com.au (Postfix, from userid 502) id B457529505; Tue, 25 Dec 2018 19:43:55 -0500 (EST) To: Arnd Bergmann , Greg Kroah-Hartman , Geert Uytterhoeven , Michael Schmitz , "James E.J. Bottomley" , "Martin K. Petersen" Message-Id: <0e72ee3231529ab642f6aea94cb93644689e79b5.1545784679.git.fthain@telegraphics.com.au> In-Reply-To: References: From: Finn Thain Subject: [PATCH v8 03/25] m68k/atari: Replace nvram_{read,write}_byte with arch_nvram_ops Date: Wed, 26 Dec 2018 11:37:59 +1100 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-m68k@lists.linux-m68k.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" By implementing an arch_nvram_ops struct, any platform can re-use the drivers/char/nvram.c 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 "CMOS" platforms don't use that function 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 Acked-by: Geert Uytterhoeven --- 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(-) diff --git a/arch/m68k/atari/nvram.c b/arch/m68k/atari/nvram.c index 3e620ee955ba..bafc9dc32830 100644 --- a/arch/m68k/atari/nvram.c +++ b/arch/m68k/atari/nvram.c @@ -39,33 +39,12 @@ 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. */ @@ -84,18 +63,6 @@ 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; @@ -107,6 +74,62 @@ 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; diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c index 99e5729d910d..f55d13e400da 100644 --- a/drivers/scsi/atari_scsi.c +++ b/drivers/scsi/atari_scsi.c @@ -760,13 +760,15 @@ static int __init atari_scsi_probe(struct platform_device *pdev) #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(16); + if (ATARIHW_PRESENT(TT_CLK)) { + unsigned char b; + loff_t offset = 16; + 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 diff --git a/include/linux/nvram.h b/include/linux/nvram.h index 28bfb9ab94ca..4f78147e74d9 100644 --- a/include/linux/nvram.h +++ b/include/linux/nvram.h @@ -11,4 +11,13 @@ extern void __nvram_write_byte(unsigned char c, int i); 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 */ -- 2.19.2