From 096bcc231fd263bc8df215f0d616b08e3696c6db Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Tue, 29 May 2012 10:16:09 +0200 Subject: mtd: mxc_nand: use 32bit copy functions MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The following commit changes the function used to copy from/to the hardware buffer to memcpy_[from|to]io. This does not work since the hardware cannot handle the byte accesses used by these functions. Instead of reverting this patch introduce 32bit correspondents of these functions. | commit 5775ba36ea9c760c2d7e697dac04f2f7fc95aa62 | Author: Uwe Kleine-König | Date: Tue Apr 24 10:05:22 2012 +0200 | | mtd: mxc_nand: fix several sparse warnings about incorrect address space | | Signed-off-by: Uwe Kleine-König | Signed-off-by: Artem Bityutskiy Signed-off-by: Sascha Hauer Cc: Uwe Kleine-König Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c index c58e6a9..6acc790 100644 --- a/drivers/mtd/nand/mxc_nand.c +++ b/drivers/mtd/nand/mxc_nand.c @@ -273,6 +273,26 @@ static struct nand_ecclayout nandv2_hw_eccoob_4k = { static const char *part_probes[] = { "RedBoot", "cmdlinepart", "ofpart", NULL }; +static void memcpy32_fromio(void *trg, const void __iomem *src, size_t size) +{ + int i; + u32 *t = trg; + const __iomem u32 *s = src; + + for (i = 0; i < (size >> 2); i++) + *t++ = __raw_readl(s++); +} + +static void memcpy32_toio(void __iomem *trg, const void *src, int size) +{ + int i; + u32 __iomem *t = trg; + const u32 *s = src; + + for (i = 0; i < (size >> 2); i++) + __raw_writel(*s++, t++); +} + static int check_int_v3(struct mxc_nand_host *host) { uint32_t tmp; @@ -519,7 +539,7 @@ static void send_read_id_v3(struct mxc_nand_host *host) wait_op_done(host, true); - memcpy_fromio(host->data_buf, host->main_area0, 16); + memcpy32_fromio(host->data_buf, host->main_area0, 16); } /* Request the NANDFC to perform a read of the NAND device ID. */ @@ -535,7 +555,7 @@ static void send_read_id_v1_v2(struct mxc_nand_host *host) /* Wait for operation to complete */ wait_op_done(host, true); - memcpy_fromio(host->data_buf, host->main_area0, 16); + memcpy32_fromio(host->data_buf, host->main_area0, 16); if (this->options & NAND_BUSWIDTH_16) { /* compress the ID info */ @@ -797,16 +817,16 @@ static void copy_spare(struct mtd_info *mtd, bool bfrom) if (bfrom) { for (i = 0; i < n - 1; i++) - memcpy_fromio(d + i * j, s + i * t, j); + memcpy32_fromio(d + i * j, s + i * t, j); /* the last section */ - memcpy_fromio(d + i * j, s + i * t, mtd->oobsize - i * j); + memcpy32_fromio(d + i * j, s + i * t, mtd->oobsize - i * j); } else { for (i = 0; i < n - 1; i++) - memcpy_toio(&s[i * t], &d[i * j], j); + memcpy32_toio(&s[i * t], &d[i * j], j); /* the last section */ - memcpy_toio(&s[i * t], &d[i * j], mtd->oobsize - i * j); + memcpy32_toio(&s[i * t], &d[i * j], mtd->oobsize - i * j); } } @@ -1070,7 +1090,8 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command, host->devtype_data->send_page(mtd, NFC_OUTPUT); - memcpy_fromio(host->data_buf, host->main_area0, mtd->writesize); + memcpy32_fromio(host->data_buf, host->main_area0, + mtd->writesize); copy_spare(mtd, true); break; @@ -1086,7 +1107,7 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command, break; case NAND_CMD_PAGEPROG: - memcpy_toio(host->main_area0, host->data_buf, mtd->writesize); + memcpy32_toio(host->main_area0, host->data_buf, mtd->writesize); copy_spare(mtd, false); host->devtype_data->send_page(mtd, NFC_INPUT); host->devtype_data->send_cmd(host, command, true); -- cgit v0.10.2 From 6023813a2d5949ba368e7df464f2ccb649719777 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Tue, 26 Jun 2012 17:26:16 +0200 Subject: mtd: gpmi-nand: fix read page when reading to vmalloced area The gpmi-nand driver uses virt_addr_valid() to check whether a buffer is suitable for dma. If it's not, a driver allocated buffer is used instead. Then after a page read the driver allocated buffer must be copied to the user supplied buffer. This does not happen since commit 7725cc85932bd02dd12c23108e0ef748c551ccba. This patch fixes the issue. The bug is encountered with UBI which uses a vmalloced buffer for the volume table. Signed-off-by: Sascha Hauer Tested-by: snijsure@grid-net.com Acked-by: Huang Shijie Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c index a05b7b4..a6cad5c 100644 --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c @@ -920,12 +920,12 @@ static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip, */ memset(chip->oob_poi, ~0, mtd->oobsize); chip->oob_poi[0] = ((uint8_t *) auxiliary_virt)[0]; - - read_page_swap_end(this, buf, mtd->writesize, - this->payload_virt, this->payload_phys, - nfc_geo->payload_size, - payload_virt, payload_phys); } + + read_page_swap_end(this, buf, mtd->writesize, + this->payload_virt, this->payload_phys, + nfc_geo->payload_size, + payload_virt, payload_phys); exit_nfc: return ret; } -- cgit v0.10.2 From 021796b892dcad45743f3196e3eef7222870dd55 Mon Sep 17 00:00:00 2001 From: Mike Dunn Date: Tue, 22 May 2012 11:03:42 -0700 Subject: mtd: ABI documentation: clarification of bitflip_threshold The -EUCLEAN return value applies to mtd_read_oob() as well as mtd_read(), but only mtd_read() was mentioned in the blurd on bitflip_threshold in the ABI documentation. Signed-off-by: Mike Dunn Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse diff --git a/Documentation/ABI/testing/sysfs-class-mtd b/Documentation/ABI/testing/sysfs-class-mtd index db1ad7e..938ef71 100644 --- a/Documentation/ABI/testing/sysfs-class-mtd +++ b/Documentation/ABI/testing/sysfs-class-mtd @@ -142,13 +142,14 @@ KernelVersion: 3.4 Contact: linux-mtd@lists.infradead.org Description: This allows the user to examine and adjust the criteria by which - mtd returns -EUCLEAN from mtd_read(). If the maximum number of - bit errors that were corrected on any single region comprising - an ecc step (as reported by the driver) equals or exceeds this - value, -EUCLEAN is returned. Otherwise, absent an error, 0 is - returned. Higher layers (e.g., UBI) use this return code as an - indication that an erase block may be degrading and should be - scrutinized as a candidate for being marked as bad. + mtd returns -EUCLEAN from mtd_read() and mtd_read_oob(). If the + maximum number of bit errors that were corrected on any single + region comprising an ecc step (as reported by the driver) equals + or exceeds this value, -EUCLEAN is returned. Otherwise, absent + an error, 0 is returned. Higher layers (e.g., UBI) use this + return code as an indication that an erase block may be + degrading and should be scrutinized as a candidate for being + marked as bad. The initial value may be specified by the flash device driver. If not, then the default value is ecc_strength. @@ -167,7 +168,7 @@ Description: block degradation, but high enough to avoid the consequences of a persistent return value of -EUCLEAN on devices where sticky bitflips occur. Note that if bitflip_threshold exceeds - ecc_strength, -EUCLEAN is never returned by mtd_read(). + ecc_strength, -EUCLEAN is never returned by the read operations. Conversely, if bitflip_threshold is zero, -EUCLEAN is always returned, absent a hard error. -- cgit v0.10.2 From 596fd46268634082314b3af1ded4612e1b7f3f03 Mon Sep 17 00:00:00 2001 From: Herton Ronaldo Krzesinski Date: Wed, 16 May 2012 16:21:52 -0300 Subject: mtd: nandsim: don't open code a do_div helper We don't need to open code the divide function, just use div_u64 that already exists and do the same job. While this is a straightforward clean up, there is more to that, the real motivation for this. While building on a cross compiling environment in armel, using gcc 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5), I was getting the following build error: ERROR: "__aeabi_uldivmod" [drivers/mtd/nand/nandsim.ko] undefined! After investigating with objdump and hand built assembly version generated with the compiler, I narrowed __aeabi_uldivmod as being generated from the divide function. When nandsim.c is built with -fno-inline-functions-called-once, that happens when CONFIG_DEBUG_SECTION_MISMATCH is enabled, the do_div optimization in arch/arm/include/asm/div64.h doesn't work as expected with the open coded divide function: even if the do_div we are using doesn't have a constant divisor, the compiler still includes the else parts of the optimized do_div macro, and translates the divisions there to use __aeabi_uldivmod, instead of only calling __do_div_asm -> __do_div64 and optimizing/removing everything else out. So to reproduce, gcc 4.6 plus CONFIG_DEBUG_SECTION_MISMATCH=y and CONFIG_MTD_NAND_NANDSIM=m should do it, building on armel. After this change, the compiler does the intended thing even with -fno-inline-functions-called-once, and optimizes out as expected the constant handling in the optimized do_div on arm. As this also avoids a build issue, I'm marking for Stable, as I think is applicable for this case. Signed-off-by: Herton Ronaldo Krzesinski Cc: stable@vger.kernel.org Acked-by: Nicolas Pitre Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c index 6cc8fbf..cf0cd31 100644 --- a/drivers/mtd/nand/nandsim.c +++ b/drivers/mtd/nand/nandsim.c @@ -28,7 +28,7 @@ #include #include #include -#include +#include #include #include #include @@ -546,12 +546,6 @@ static char *get_partition_name(int i) return kstrdup(buf, GFP_KERNEL); } -static uint64_t divide(uint64_t n, uint32_t d) -{ - do_div(n, d); - return n; -} - /* * Initialize the nandsim structure. * @@ -580,7 +574,7 @@ static int init_nandsim(struct mtd_info *mtd) ns->geom.oobsz = mtd->oobsize; ns->geom.secsz = mtd->erasesize; ns->geom.pgszoob = ns->geom.pgsz + ns->geom.oobsz; - ns->geom.pgnum = divide(ns->geom.totsz, ns->geom.pgsz); + ns->geom.pgnum = div_u64(ns->geom.totsz, ns->geom.pgsz); ns->geom.totszoob = ns->geom.totsz + (uint64_t)ns->geom.pgnum * ns->geom.oobsz; ns->geom.secshift = ffs(ns->geom.secsz) - 1; ns->geom.pgshift = chip->page_shift; @@ -921,7 +915,7 @@ static int setup_wear_reporting(struct mtd_info *mtd) if (!rptwear) return 0; - wear_eb_count = divide(mtd->size, mtd->erasesize); + wear_eb_count = div_u64(mtd->size, mtd->erasesize); mem = wear_eb_count * sizeof(unsigned long); if (mem / sizeof(unsigned long) != wear_eb_count) { NS_ERR("Too many erase blocks for wear reporting\n"); -- cgit v0.10.2