From patchwork Sun Aug 23 10:41:32 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Finn Thain X-Patchwork-Id: 509822 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id C03431402AA for ; Sun, 23 Aug 2015 21:14:48 +1000 (AEST) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 9A5921A1DC3 for ; Sun, 23 Aug 2015 21:14:48 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from kvm5.telegraphics.com.au (kvm5.telegraphics.com.au [98.124.60.144]) by lists.ozlabs.org (Postfix) with ESMTP id 8E69F1A0E5F for ; Sun, 23 Aug 2015 21:13:29 +1000 (AEST) Received: by kvm5.telegraphics.com.au (Postfix, from userid 502) id 01FF328657; Sun, 23 Aug 2015 07:13:25 -0400 (EDT) Message-Id: <20150823104130.287718296@telegraphics.com.au> User-Agent: quilt/0.50-1 Date: Sun, 23 Aug 2015 20:41:32 +1000 From: Finn Thain To: , , , Geert Uytterhoeven , Michael Schmitz , "James E.J. Bottomley" , linux-scsi@vger.kernel.org Subject: [RFC v6 03/25] m68k/atari: Replace nvram_{read, write}_byte with arch_nvram_ops References: <20150823104129.517600532@telegraphics.com.au> Content-Disposition: inline; filename=atari_scsi-convert-to-nvram_ops X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 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(-) Index: linux/arch/m68k/atari/nvram.c =================================================================== --- linux.orig/arch/m68k/atari/nvram.c 2015-08-23 20:40:55.000000000 +1000 +++ linux/arch/m68k/atari/nvram.c 2015-08-23 20:40:57.000000000 +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 2015-08-23 20:40:53.000000000 +1000 +++ linux/drivers/scsi/atari_scsi.c 2015-08-23 20:40:57.000000000 +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 2015-08-23 20:40:53.000000000 +1000 +++ linux/include/linux/nvram.h 2015-08-23 20:40:57.000000000 +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 */