mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-19 06:53:44 +02:00
140 lines
4.0 KiB
Diff
140 lines
4.0 KiB
Diff
|
From 72112b91624dca6c636bd3a592471642d3988b27 Mon Sep 17 00:00:00 2001
|
||
|
|
From: John Crispin <blogic@openwrt.org>
|
||
|
|
Date: Fri, 20 Jul 2012 19:09:01 +0200
|
||
|
|
Subject: [PATCH 111/123] MTD: MIPS: lantiq: Add NAND support on Lantiq FALCON
|
||
|
|
SoC.
|
||
|
|
|
||
|
|
The driver uses plat_nand. As the platform_device is loaded from DT, we need
|
||
|
|
to lookup the node and attach our falocn specific "struct platform_nand_data"
|
||
|
|
to it.
|
||
|
|
|
||
|
|
Signed-off-by: John Crispin <blogic@openwrt.org>
|
||
|
|
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
|
||
|
|
Cc: linux-mtd@lists.infradead.org
|
||
|
|
---
|
||
|
|
drivers/mtd/nand/Kconfig | 8 ++++
|
||
|
|
drivers/mtd/nand/Makefile | 1 +
|
||
|
|
drivers/mtd/nand/falcon_nand.c | 82 ++++++++++++++++++++++++++++++++++++++++
|
||
|
|
3 files changed, 91 insertions(+)
|
||
|
|
create mode 100644 drivers/mtd/nand/falcon_nand.c
|
||
|
|
|
||
|
|
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
|
||
|
|
index 4883139..a3b05be 100644
|
||
|
|
--- a/drivers/mtd/nand/Kconfig
|
||
|
|
+++ b/drivers/mtd/nand/Kconfig
|
||
|
|
@@ -572,4 +572,12 @@ config MTD_NAND_XWAY
|
||
|
|
Enables support for NAND Flash chips on Lantiq XWAY SoCs. NAND is attached
|
||
|
|
to the External Bus Unit (EBU).
|
||
|
|
|
||
|
|
+config MTD_NAND_FALCON
|
||
|
|
+ tristate "Support for NAND on Lantiq FALC-ON SoC"
|
||
|
|
+ depends on LANTIQ && SOC_FALCON
|
||
|
|
+ select MTD_NAND_PLATFORM
|
||
|
|
+ help
|
||
|
|
+ Enables support for NAND Flash chips on Lantiq FALC-ON SoCs. NAND is
|
||
|
|
+ attached to the External Bus Unit (EBU).
|
||
|
|
+
|
||
|
|
endif # MTD_NAND
|
||
|
|
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
|
||
|
|
index 2cbd091..a97e1b5 100644
|
||
|
|
--- a/drivers/mtd/nand/Makefile
|
||
|
|
+++ b/drivers/mtd/nand/Makefile
|
||
|
|
@@ -53,5 +53,6 @@ obj-$(CONFIG_MTD_NAND_RICOH) += r852.o
|
||
|
|
obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
|
||
|
|
obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/
|
||
|
|
obj-$(CONFIG_MTD_NAND_XWAY) += xway_nand.o
|
||
|
|
+obj-$(CONFIG_MTD_NAND_FALCON) += falcon_nand.o
|
||
|
|
|
||
|
|
nand-objs := nand_base.o nand_bbt.o
|
||
|
|
diff --git a/drivers/mtd/nand/falcon_nand.c b/drivers/mtd/nand/falcon_nand.c
|
||
|
|
new file mode 100644
|
||
|
|
index 0000000..b3b850c
|
||
|
|
--- /dev/null
|
||
|
|
+++ b/drivers/mtd/nand/falcon_nand.c
|
||
|
|
@@ -0,0 +1,82 @@
|
||
|
|
+/*
|
||
|
|
+ * This program is free software; you can redistribute it and/or modify it
|
||
|
|
+ * under the terms of the GNU General Public License version 2 as published
|
||
|
|
+ * by the Free Software Foundation.
|
||
|
|
+ *
|
||
|
|
+ * Copyright (C) 2011 Thomas Langer <thomas.langer@lantiq.com>
|
||
|
|
+ * Copyright (C) 2011 John Crispin <blogic@openwrt.org>
|
||
|
|
+ */
|
||
|
|
+
|
||
|
|
+#include <linux/mtd/nand.h>
|
||
|
|
+#include <linux/of_platform.h>
|
||
|
|
+
|
||
|
|
+#include <lantiq_soc.h>
|
||
|
|
+
|
||
|
|
+/* nand flash */
|
||
|
|
+/* address lines used for NAND control signals */
|
||
|
|
+#define NAND_ADDR_ALE 0x10000
|
||
|
|
+#define NAND_ADDR_CLE 0x20000
|
||
|
|
+/* Ready/Busy Status */
|
||
|
|
+#define MODCON_STS 0x0002
|
||
|
|
+/* Ready/Busy Status Edge */
|
||
|
|
+#define MODCON_STSEDGE 0x0004
|
||
|
|
+#define LTQ_EBU_MODCON 0x000C
|
||
|
|
+
|
||
|
|
+static const char *part_probes[] = { "cmdlinepart", "ofpart", NULL };
|
||
|
|
+
|
||
|
|
+static int falcon_nand_ready(struct mtd_info *mtd)
|
||
|
|
+{
|
||
|
|
+ u32 modcon = ltq_ebu_r32(LTQ_EBU_MODCON);
|
||
|
|
+
|
||
|
|
+ return (((modcon & (MODCON_STS | MODCON_STSEDGE)) ==
|
||
|
|
+ (MODCON_STS | MODCON_STSEDGE)));
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static void falcon_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
|
||
|
|
+{
|
||
|
|
+ struct nand_chip *this = mtd->priv;
|
||
|
|
+ unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
|
||
|
|
+
|
||
|
|
+ if (ctrl & NAND_CTRL_CHANGE) {
|
||
|
|
+ nandaddr &= ~(NAND_ADDR_ALE | NAND_ADDR_CLE);
|
||
|
|
+
|
||
|
|
+ if (ctrl & NAND_CLE)
|
||
|
|
+ nandaddr |= NAND_ADDR_CLE;
|
||
|
|
+ if (ctrl & NAND_ALE)
|
||
|
|
+ nandaddr |= NAND_ADDR_ALE;
|
||
|
|
+
|
||
|
|
+ this->IO_ADDR_W = (void __iomem *) nandaddr;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ if (cmd != NAND_CMD_NONE)
|
||
|
|
+ writeb(cmd, this->IO_ADDR_W);
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static struct platform_nand_data falcon_nand_data = {
|
||
|
|
+ .chip = {
|
||
|
|
+ .nr_chips = 1,
|
||
|
|
+ .chip_delay = 25,
|
||
|
|
+ .part_probe_types = part_probes,
|
||
|
|
+ },
|
||
|
|
+ .ctrl = {
|
||
|
|
+ .cmd_ctrl = falcon_hwcontrol,
|
||
|
|
+ .dev_ready = falcon_nand_ready,
|
||
|
|
+ }
|
||
|
|
+};
|
||
|
|
+
|
||
|
|
+static int __init falcon_register_nand(void)
|
||
|
|
+{
|
||
|
|
+ struct device_node *node;
|
||
|
|
+ struct platform_device *pdev;
|
||
|
|
+
|
||
|
|
+ node = of_find_compatible_node(NULL, NULL, "lantiq,nand-falcon");
|
||
|
|
+ if (!node)
|
||
|
|
+ return -1;
|
||
|
|
+ pdev = of_find_device_by_node(node);
|
||
|
|
+ if (pdev)
|
||
|
|
+ pdev->dev.platform_data = &falcon_nand_data;
|
||
|
|
+ of_node_put(node);
|
||
|
|
+ return 0;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+arch_initcall(falcon_register_nand);
|
||
|
|
--
|
||
|
|
1.7.10.4
|
||
|
|
|