diff options
Diffstat (limited to 'target/linux/lantiq/patches-3.10/0206-lantiq-nand-lock.patch')
| -rw-r--r-- | target/linux/lantiq/patches-3.10/0206-lantiq-nand-lock.patch | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/target/linux/lantiq/patches-3.10/0206-lantiq-nand-lock.patch b/target/linux/lantiq/patches-3.10/0206-lantiq-nand-lock.patch deleted file mode 100644 index 34d7235ec6..0000000000 --- a/target/linux/lantiq/patches-3.10/0206-lantiq-nand-lock.patch +++ /dev/null @@ -1,137 +0,0 @@ -From patchwork Wed Apr 2 19:38:52 2014 -Content-Type: text/plain; charset="utf-8" -MIME-Version: 1.0 -Content-Transfer-Encoding: 7bit -Subject: [OpenWrt-Devel, - 4/7] lantiq: BT Home Hub 2B support - nand pci interference -Date: Wed, 02 Apr 2014 18:38:52 -0000 -From: Ben Mulvihill <ben.mulvihill@gmail.com> -X-Patchwork-Id: 5113 -Message-Id: <1396467532.31327.42.camel@merveille.lan> -To: openwrt-devel@lists.openwrt.org - -Prevents interference between the xway nand driver and pci. - -(Based on work by Simon Hayes first published on www.psidoc.com and -http://sourceforge.net/projects/hh2b4ever/) - -Signed-off-by: Ben Mulvihill <ben.mulvihill@gmail.com> - ---- - - ---- a/drivers/mtd/nand/xway_nand.c -+++ b/drivers/mtd/nand/xway_nand.c -@@ -54,8 +54,27 @@ - #define NAND_CON_CSMUX (1 << 1) - #define NAND_CON_NANDM 1 - -+#define DANUBE_PCI_REG32( addr ) (*(volatile u32 *)(addr)) -+#define PCI_CR_PR_OFFSET (KSEG1+0x1E105400) -+#define PCI_CR_PC_ARB (PCI_CR_PR_OFFSET + 0x0080) -+ - static u32 xway_latchcmd; - -+/* -+ * req_mask provides a mechanism to prevent interference between -+ * nand and pci (probably only relevant for the BT Home Hub 2B). -+ * Setting it causes the corresponding pci req pins to be masked -+ * during nand access, and also moves ebu locking from the read/write -+ * functions to the chip select function to ensure that the whole -+ * operation runs with interrupts disabled. -+ * In addition it switches on some extra waiting in xway_cmd_ctrl(). -+ * This seems to be necessary if the ebu_cs1 pin has open-drain disabled, -+ * which in turn seems to be necessary for the nor chip to be recognised -+ * reliably, on a board (Home Hub 2B again) which has both nor and nand. -+ */ -+ -+static __be32 req_mask = 0; -+ - static void xway_reset_chip(struct nand_chip *chip) - { - unsigned long nandaddr = (unsigned long) chip->IO_ADDR_W; -@@ -86,12 +105,24 @@ static void xway_select_chip(struct mtd_ - case -1: - ltq_ebu_w32_mask(NAND_CON_CE, 0, EBU_NAND_CON); - ltq_ebu_w32_mask(NAND_CON_NANDM, 0, EBU_NAND_CON); -+ -+ if (req_mask) { -+ /* Unmask all external PCI request */ -+ DANUBE_PCI_REG32(PCI_CR_PC_ARB) &= ~(req_mask << 16); -+ } - spin_unlock_irqrestore(&ebu_lock, csflags); -+ - break; - case 0: - spin_lock_irqsave(&ebu_lock, csflags); -+ if (req_mask) { -+ /* Mask all external PCI request */ -+ DANUBE_PCI_REG32(PCI_CR_PC_ARB) |= (req_mask << 16); -+ } -+ - ltq_ebu_w32_mask(0, NAND_CON_NANDM, EBU_NAND_CON); - ltq_ebu_w32_mask(0, NAND_CON_CE, EBU_NAND_CON); -+ - break; - default: - BUG(); -@@ -103,6 +134,12 @@ static void xway_cmd_ctrl(struct mtd_inf - struct nand_chip *this = mtd->priv; - unsigned long nandaddr = (unsigned long) this->IO_ADDR_W; - -+ if (req_mask) { -+ if (cmd != NAND_CMD_STATUS) -+ ltq_ebu_w32(EBU_NAND_WAIT, 0); /* Clear nand ready */ -+ } -+ -+ - if (ctrl & NAND_CTRL_CHANGE) { - if (ctrl & NAND_CLE) - xway_latchcmd = NAND_WRITE_CMD; -@@ -115,6 +152,24 @@ static void xway_cmd_ctrl(struct mtd_inf - while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0) - ; - } -+ -+ if (req_mask) { -+ /* -+ * program and erase have their own busy handlers -+ * status and sequential in needs no delay -+ */ -+ switch (cmd) { -+ case NAND_CMD_ERASE1: -+ case NAND_CMD_SEQIN: -+ case NAND_CMD_STATUS: -+ case NAND_CMD_READID: -+ return; -+ } -+ -+ /* wait until command is processed */ -+ while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_RD) == 0) -+ ; -+ } - } - - static int xway_dev_ready(struct mtd_info *mtd) -@@ -157,6 +212,8 @@ static int xway_nand_probe(struct platfo - { - struct nand_chip *this = platform_get_drvdata(pdev); - unsigned long nandaddr = (unsigned long) this->IO_ADDR_W; -+ const __be32 *req_mask_ptr = of_get_property(pdev->dev.of_node, -+ "req-mask", NULL); - const __be32 *cs = of_get_property(pdev->dev.of_node, - "lantiq,cs", NULL); - u32 cs_flag = 0; -@@ -165,6 +222,12 @@ static int xway_nand_probe(struct platfo - if (cs && (*cs == 1)) - cs_flag = NAND_CON_IN_CS1 | NAND_CON_OUT_CS1; - -+ /* -+ * Load the PCI req lines to mask from the device tree. If the -+ * property is not present, setting req_mask to 0 disables masking. -+ */ -+ req_mask = (req_mask_ptr ? *req_mask_ptr : 0); -+ - /* setup the EBU to run in NAND mode on our base addr */ - ltq_ebu_w32(CPHYSADDR(nandaddr) - | ADDSEL1_MASK(3) | ADDSEL1_REGEN, EBU_ADDSEL1); |