lantiq: add v3.9 support
[openwrt/svn-archive/archive.git] / target / linux / lantiq / patches-3.9 / 0013-MTD-lantiq-Add-NAND-support-on-Lantiq-Falcon-SoC.patch
1 From 6bfb122580ccf67b82abf6c5fe2ae1e770812f0d Mon Sep 17 00:00:00 2001
2 From: John Crispin <blogic@openwrt.org>
3 Date: Wed, 30 Jan 2013 21:12:47 +0100
4 Subject: [PATCH 13/22] MTD: lantiq: Add NAND support on Lantiq Falcon SoC.
5
6 The driver uses plat_nand. As the platform_device is loaded from DT, we need
7 to lookup the node and attach our falcon specific "struct platform_nand_data"
8 to it.
9
10 Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
11 Signed-off-by: John Crispin <blogic@openwrt.org>
12 ---
13 drivers/mtd/nand/Kconfig | 8 ++++
14 drivers/mtd/nand/Makefile | 1 +
15 drivers/mtd/nand/falcon_nand.c | 83 ++++++++++++++++++++++++++++++++++++++++
16 3 files changed, 92 insertions(+)
17 create mode 100644 drivers/mtd/nand/falcon_nand.c
18
19 diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
20 index 81bf5e5..2738097 100644
21 --- a/drivers/mtd/nand/Kconfig
22 +++ b/drivers/mtd/nand/Kconfig
23 @@ -574,4 +574,12 @@ config MTD_NAND_XWAY
24 Enables support for NAND Flash chips on Lantiq XWAY SoCs. NAND is attached
25 to the External Bus Unit (EBU).
26
27 +config MTD_NAND_FALCON
28 + tristate "Support for NAND on Lantiq FALC-ON SoC"
29 + depends on LANTIQ && SOC_FALCON
30 + select MTD_NAND_PLATFORM
31 + help
32 + Enables support for NAND Flash chips on Lantiq FALC-ON SoCs. NAND is
33 + attached to the External Bus Unit (EBU).
34 +
35 endif # MTD_NAND
36 diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
37 index d76d912..1a61bf0 100644
38 --- a/drivers/mtd/nand/Makefile
39 +++ b/drivers/mtd/nand/Makefile
40 @@ -53,5 +53,6 @@ obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
41 obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/
42 obj-$(CONFIG_MTD_NAND_XWAY) += xway_nand.o
43 obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) += bcm47xxnflash/
44 +obj-$(CONFIG_MTD_NAND_FALCON) += falcon_nand.o
45
46 nand-objs := nand_base.o nand_bbt.o
47 diff --git a/drivers/mtd/nand/falcon_nand.c b/drivers/mtd/nand/falcon_nand.c
48 new file mode 100644
49 index 0000000..13458d3
50 --- /dev/null
51 +++ b/drivers/mtd/nand/falcon_nand.c
52 @@ -0,0 +1,83 @@
53 +/*
54 + * This program is free software; you can redistribute it and/or modify it
55 + * under the terms of the GNU General Public License version 2 as published
56 + * by the Free Software Foundation.
57 + *
58 + * Copyright (C) 2011 Thomas Langer <thomas.langer@lantiq.com>
59 + * Copyright (C) 2011 John Crispin <blogic@openwrt.org>
60 + */
61 +
62 +#include <linux/mtd/nand.h>
63 +#include <linux/of_platform.h>
64 +
65 +#include <lantiq_soc.h>
66 +
67 +/* address lines used for NAND control signals */
68 +#define NAND_ADDR_ALE 0x10000
69 +#define NAND_ADDR_CLE 0x20000
70 +
71 +/* Ready/Busy Status */
72 +#define MODCON_STS 0x0002
73 +
74 +/* Ready/Busy Status Edge */
75 +#define MODCON_STSEDGE 0x0004
76 +#define LTQ_EBU_MODCON 0x000C
77 +
78 +static const char const *part_probes[] = { "cmdlinepart", "ofpart", NULL };
79 +
80 +static int falcon_nand_ready(struct mtd_info *mtd)
81 +{
82 + u32 modcon = ltq_ebu_r32(LTQ_EBU_MODCON);
83 +
84 + return (((modcon & (MODCON_STS | MODCON_STSEDGE)) ==
85 + (MODCON_STS | MODCON_STSEDGE)));
86 +}
87 +
88 +static void falcon_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
89 +{
90 + struct nand_chip *this = mtd->priv;
91 + unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
92 +
93 + if (ctrl & NAND_CTRL_CHANGE) {
94 + nandaddr &= ~(NAND_ADDR_ALE | NAND_ADDR_CLE);
95 +
96 + if (ctrl & NAND_CLE)
97 + nandaddr |= NAND_ADDR_CLE;
98 + if (ctrl & NAND_ALE)
99 + nandaddr |= NAND_ADDR_ALE;
100 +
101 + this->IO_ADDR_W = (void __iomem *) nandaddr;
102 + }
103 +
104 + if (cmd != NAND_CMD_NONE)
105 + writeb(cmd, this->IO_ADDR_W);
106 +}
107 +
108 +static struct platform_nand_data falcon_nand_data = {
109 + .chip = {
110 + .nr_chips = 1,
111 + .chip_delay = 25,
112 + .part_probe_types = part_probes,
113 + },
114 + .ctrl = {
115 + .cmd_ctrl = falcon_hwcontrol,
116 + .dev_ready = falcon_nand_ready,
117 + }
118 +};
119 +
120 +int __init falcon_register_nand(void)
121 +{
122 + struct device_node *node;
123 + struct platform_device *pdev;
124 +
125 + node = of_find_compatible_node(NULL, NULL, "lantiq,nand-falcon");
126 + if (!node)
127 + return -1;
128 + pdev = of_find_device_by_node(node);
129 + if (pdev)
130 + pdev->dev.platform_data = &falcon_nand_data;
131 + of_node_put(node);
132 + return 0;
133 +}
134 +
135 +arch_initcall(falcon_register_nand);
136 --
137 1.7.10.4
138