X-Git-Url: http://git.openwrt.org/?a=blobdiff_plain;f=target%2Flinux%2Flantiq%2Fpatches-5.4%2F0018-MTD-nand-lots-of-xrx200-fixes.patch;fp=target%2Flinux%2Flantiq%2Fpatches-5.4%2F0018-MTD-nand-lots-of-xrx200-fixes.patch;h=4e34580efcb79cac86b70ab8027e89cf11525990;hb=333b796c04d313cac56043b91461f083b71f8b45;hp=0000000000000000000000000000000000000000;hpb=154443754950578d6acfaf829f3c970b66e77cad;p=openwrt%2Fstaging%2Fmkresin.git

diff --git a/target/linux/lantiq/patches-5.4/0018-MTD-nand-lots-of-xrx200-fixes.patch b/target/linux/lantiq/patches-5.4/0018-MTD-nand-lots-of-xrx200-fixes.patch
new file mode 100644
index 0000000000..4e34580efc
--- /dev/null
+++ b/target/linux/lantiq/patches-5.4/0018-MTD-nand-lots-of-xrx200-fixes.patch
@@ -0,0 +1,122 @@
+From 997a8965db8417266bea3fbdcfa3e5655a1b52fa Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Tue, 9 Sep 2014 23:12:15 +0200
+Subject: [PATCH 18/36] MTD: nand: lots of xrx200 fixes
+
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ drivers/mtd/nand/raw/xway_nand.c |   63 ++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 63 insertions(+)
+
+--- a/drivers/mtd/nand/raw/xway_nand.c
++++ b/drivers/mtd/nand/raw/xway_nand.c
+@@ -63,6 +63,24 @@
+ #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)
++
++/*
++ * 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;
++
+ struct xway_nand_data {
+ 	struct nand_chip	chip;
+ 	unsigned long		csflags;
+@@ -94,10 +112,22 @@ 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, data->csflags);
+ 		break;
+ 	case 0:
+ 		spin_lock_irqsave(&ebu_lock, data->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;
+@@ -108,6 +138,12 @@ static void xway_select_chip(struct mtd_
+ 
+ static void xway_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+ {
++
++	if (req_mask) {
++		if (cmd != NAND_CMD_STATUS)
++			ltq_ebu_w32(0, EBU_NAND_WAIT); /* Clear nand ready */
++	}
++
+ 	if (cmd == NAND_CMD_NONE)
+ 		return;
+ 
+@@ -118,6 +154,24 @@ 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 +211,7 @@ static int xway_nand_probe(struct platfo
+ 	int err;
+ 	u32 cs;
+ 	u32 cs_flag = 0;
++	const __be32 *req_mask_ptr;
+ 
+ 	/* Allocate memory for the device structure (and zero it) */
+ 	data = devm_kzalloc(&pdev->dev, sizeof(struct xway_nand_data),
+@@ -192,6 +247,15 @@ static int xway_nand_probe(struct platfo
+ 	if (!err && cs == 1)
+ 		cs_flag = NAND_CON_IN_CS1 | NAND_CON_OUT_CS1;
+ 
++	req_mask_ptr = of_get_property(pdev->dev.of_node,
++					"req-mask", NULL);
++
++	/*
++	 * 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(data->nandaddr)
+ 		    | ADDSEL1_MASK(3) | ADDSEL1_REGEN, EBU_ADDSEL1);