From e2c285e95e75258c196fbc04a742d91be6d00f49 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Wed, 30 Jan 2013 21:12:47 +0100 Subject: [PATCH 18/31] MTD: 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 falcon specific "struct platform_nand_data" to it. Signed-off-by: Thomas Langer Signed-off-by: John Crispin --- drivers/mtd/nand/Kconfig | 8 ++++ drivers/mtd/nand/Makefile | 1 + drivers/mtd/nand/falcon_nand.c | 83 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 92 insertions(+) create mode 100644 drivers/mtd/nand/falcon_nand.c diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig index 90ff447..7064f0e 100644 --- a/drivers/mtd/nand/Kconfig +++ b/drivers/mtd/nand/Kconfig @@ -510,4 +510,12 @@ 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 542b568..78a1cd2 100644 --- a/drivers/mtd/nand/Makefile +++ b/drivers/mtd/nand/Makefile @@ -49,5 +49,6 @@ 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_BCM47XXNFLASH) += bcm47xxnflash/ +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..13458d3 --- /dev/null +++ b/drivers/mtd/nand/falcon_nand.c @@ -0,0 +1,83 @@ +/* + * 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 + * Copyright (C) 2011 John Crispin + */ + +#include +#include + +#include + +/* 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 const *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, + } +}; + +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