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| author | John Crispin <john@openwrt.org> | 2014-04-03 14:27:02 +0000 |
|---|---|---|
| committer | John Crispin <john@openwrt.org> | 2014-04-03 14:27:02 +0000 |
| commit | a05356f48a232fcb19c8b845bc2e4267086a2d7a (patch) | |
| tree | 978a05bb3748103746a6826541c7eb7a2eed11aa /target/linux/lantiq/patches-3.10/0205-lantiq-nand-lock.patch | |
| parent | 15139d468c9bcf80e3a110ea3625626d9895b5fe (diff) | |
| download | master-31e0f0ae-a05356f48a232fcb19c8b845bc2e4267086a2d7a.tar.gz master-31e0f0ae-a05356f48a232fcb19c8b845bc2e4267086a2d7a.tar.bz2 master-31e0f0ae-a05356f48a232fcb19c8b845bc2e4267086a2d7a.zip | |
lantiq: nand fixes
Signed-off-by: John Crispin <blogic@openwrt.org>
SVN-Revision: 40372
Diffstat (limited to 'target/linux/lantiq/patches-3.10/0205-lantiq-nand-lock.patch')
| -rw-r--r-- | target/linux/lantiq/patches-3.10/0205-lantiq-nand-lock.patch | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-3.10/0205-lantiq-nand-lock.patch b/target/linux/lantiq/patches-3.10/0205-lantiq-nand-lock.patch new file mode 100644 index 0000000000..f82774d889 --- /dev/null +++ b/target/linux/lantiq/patches-3.10/0205-lantiq-nand-lock.patch @@ -0,0 +1,86 @@ +From patchwork Wed Apr 2 19:38:31 2014 +Content-Type: text/plain; charset="utf-8" +MIME-Version: 1.0 +Content-Transfer-Encoding: 7bit +Subject: [OpenWrt-Devel, + 3/7] lantiq: BT Home Hub 2B support - nand driver locking +Date: Wed, 02 Apr 2014 18:38:31 -0000 +From: Ben Mulvihill <ben.mulvihill@gmail.com> +X-Patchwork-Id: 5112 +Message-Id: <1396467511.31327.41.camel@merveille.lan> +To: openwrt-devel@lists.openwrt.org + +As a result of changeset 40310, the xway nand driver +now acquires ebu_lock in the chip select function, and +holds it for the entire duration of an operation until +the chip is deselected. There is surely no longer any +need therefore also to acquire the lock in each separate +read or write function. This patch removes that code. + +Signed-off-by: Ben Mulvihill <ben.mulvihill@gmail.com> + +--- + + +--- a/drivers/mtd/nand/xway_nand.c 2014-04-01 20:14:53.072824371 +0200 ++++ b/drivers/mtd/nand/xway_nand.c 2014-04-01 21:24:52.798612391 +0200 +@@ -102,7 +102,6 @@ static void xway_cmd_ctrl(struct mtd_inf + { + struct nand_chip *this = mtd->priv; + unsigned long nandaddr = (unsigned long) this->IO_ADDR_W; +- unsigned long flags; + + if (ctrl & NAND_CTRL_CHANGE) { + if (ctrl & NAND_CLE) +@@ -112,11 +111,9 @@ static void xway_cmd_ctrl(struct mtd_inf + } + + if (cmd != NAND_CMD_NONE) { +- spin_lock_irqsave(&ebu_lock, flags); + writeb(cmd, (void __iomem *) (nandaddr | xway_latchcmd)); + while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0) + ; +- spin_unlock_irqrestore(&ebu_lock, flags); + } + } + +@@ -129,12 +126,9 @@ static unsigned char xway_read_byte(stru + { + struct nand_chip *this = mtd->priv; + unsigned long nandaddr = (unsigned long) this->IO_ADDR_R; +- unsigned long flags; + int ret; + +- spin_lock_irqsave(&ebu_lock, flags); + ret = ltq_r8((void __iomem *)(nandaddr | NAND_READ_DATA)); +- spin_unlock_irqrestore(&ebu_lock, flags); + + return ret; + } +@@ -143,26 +137,20 @@ static void xway_read_buf(struct mtd_inf + { + struct nand_chip *this = mtd->priv; + unsigned long nandaddr = (unsigned long) this->IO_ADDR_R; +- unsigned long flags; + int i; + +- spin_lock_irqsave(&ebu_lock, flags); + for (i = 0; i < len; i++) + buf[i] = ltq_r8((void __iomem *)(nandaddr | NAND_READ_DATA)); +- spin_unlock_irqrestore(&ebu_lock, flags); + } + + static void xway_write_buf(struct mtd_info *mtd, const u_char *buf, int len) + { + struct nand_chip *this = mtd->priv; + unsigned long nandaddr = (unsigned long) this->IO_ADDR_W; +- unsigned long flags; + int i; + +- spin_lock_irqsave(&ebu_lock, flags); + for (i = 0; i < len; i++) + ltq_w8(buf[i], (void __iomem *)nandaddr); +- spin_unlock_irqrestore(&ebu_lock, flags); + } + + static int xway_nand_probe(struct platform_device *pdev) |