Re: [PATCH v3]: Introducing 'gpmc-nand.c' for GPMC specific NAND init

[Tony Lindgren <tony@atomide.com>]

Hi,

Few more comments below.

* Vimal Singh <vimal.newwork@gmail.com> [100111 02:47]:
> On Mon, Jan 11, 2010 at 4:10 PM, Vimal Singh <vimal.newwork@gmail.com> wrote:
> > Re-summiting this patch. After re-basing on LO master.
> >
> > -vimal
> >
> >
> > From a7ea8851fe96690c9322393eb35a344853992166 Mon Sep 17 00:00:00 2001
> > From: Vimal Singh <vimalsingh@ti.com>
> > Date: Mon, 11 Jan 2010 16:01:29 +0530
> > Subject: [PATCH] Introducing 'gpmc-nand.c' for GPMC specific NAND init
> >
> > Introducing 'gpmc-nand.c' for GPMC specific NAND init.
> > For example: GPMC timing parameters and all.
> > This patch also migrates gpmc related calls from 'nand/omap2.c'
> > to 'gpmc-nand.c'.
> >
> > Signed-off-by: Vimal Singh <vimalsingh@ti.com>
> > ---
> >  arch/arm/mach-omap2/Makefile           |    3 +
> >  arch/arm/mach-omap2/gpmc-nand.c        |  136 ++++++++++++++++++++++++++++++++
> >  arch/arm/plat-omap/include/plat/nand.h |    6 ++
> >  drivers/mtd/nand/omap2.c               |   26 +------
> >  4 files changed, 148 insertions(+), 23 deletions(-)
> >  create mode 100644 arch/arm/mach-omap2/gpmc-nand.c
> 
> 
> Patch got line wrapped. Corrected it below.
> 
> From a7ea8851fe96690c9322393eb35a344853992166 Mon Sep 17 00:00:00 2001
> From: Vimal Singh <vimalsingh@ti.com>
> Date: Mon, 11 Jan 2010 16:01:29 +0530
> Subject: [PATCH] Introducing 'gpmc-nand.c' for GPMC specific NAND init
> 
> Introducing 'gpmc-nand.c' for GPMC specific NAND init.
> For example: GPMC timing parameters and all.
> This patch also migrates gpmc related calls from 'nand/omap2.c'
> to 'gpmc-nand.c'.
> 
> Signed-off-by: Vimal Singh <vimalsingh@ti.com>
> ---
>  arch/arm/mach-omap2/Makefile           |    3 +
>  arch/arm/mach-omap2/gpmc-nand.c        |  136 ++++++++++++++++++++++++++++++++
>  arch/arm/plat-omap/include/plat/nand.h |    6 ++
>  drivers/mtd/nand/omap2.c               |   26 +------
>  4 files changed, 148 insertions(+), 23 deletions(-)
>  create mode 100644 arch/arm/mach-omap2/gpmc-nand.c
> 
> diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
> index b32678b..247438b 100644
> --- a/arch/arm/mach-omap2/Makefile
> +++ b/arch/arm/mach-omap2/Makefile
> @@ -119,5 +119,8 @@ obj-y					+= usb-ehci.o
>  onenand-$(CONFIG_MTD_ONENAND_OMAP2)	:= gpmc-onenand.o
>  obj-y					+= $(onenand-m) $(onenand-y)
> 
> +nand-$(CONFIG_MTD_NAND_OMAP2)		:= gpmc-nand.o
> +obj-y					+= $(nand-m) $(nand-y)
> +
>  smc91x-$(CONFIG_SMC91X)			:= gpmc-smc91x.o
>  obj-y					+= $(smc91x-m) $(smc91x-y)
> diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nand.c
> new file mode 100644
> index 0000000..822ba82
> --- /dev/null
> +++ b/arch/arm/mach-omap2/gpmc-nand.c
> @@ -0,0 +1,136 @@
> +/*
> + * gpmc-nand.c
> + *
> + * Copyright (C) 2009 Texas Instruments
> + * Vimal Singh <vimalsingh@ti.com>
> + *
> + * 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.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +
> +#include <asm/mach/flash.h>
> +
> +#include <plat/nand.h>
> +#include <plat/board.h>
> +#include <plat/gpmc.h>
> +
> +#define WR_RD_PIN_MONITORING	0x00600000
> +
> +static struct omap_nand_platform_data *gpmc_nand_data;
> +
> +static struct resource gpmc_nand_resource = {
> +	.flags		= IORESOURCE_MEM,
> +};
> +
> +static struct platform_device gpmc_nand_device = {
> +	.name		= "omap2-nand",
> +	.id		= 0,
> +	.num_resources	= 1,
> +	.resource	= &gpmc_nand_resource,
> +};
> +
> +static int omap2_nand_gpmc_config(int cs, void __iomem *nand_base)
> +{
> +	struct gpmc_timings t;
> +	int err;
> +
> +	const int cs_rd_off = 36;
> +	const int cs_wr_off = 36;
> +	const int adv_on = 6;
> +	const int adv_rd_off = 24;
> +	const int adv_wr_off = 36;
> +	const int oe_off = 48;
> +	const int we_off = 30;
> +	const int rd_cycle = 72;
> +	const int wr_cycle = 72;
> +	const int access = 54;
> +	const int wr_data_mux_bus = 0;
> +	const int wr_access = 30;
> +
> +	memset(&t, 0, sizeof(t));
> +	t.sync_clk = 0;
> +	t.cs_on = 0;
> +	t.adv_on = gpmc_round_ns_to_ticks(adv_on);
> +
> +	/* Read */
> +	t.adv_rd_off = gpmc_round_ns_to_ticks(adv_rd_off);
> +	t.oe_on  = t.adv_on;
> +	t.access = gpmc_round_ns_to_ticks(access);
> +	t.oe_off = gpmc_round_ns_to_ticks(oe_off);
> +	t.cs_rd_off = gpmc_round_ns_to_ticks(cs_rd_off);
> +	t.rd_cycle  = gpmc_round_ns_to_ticks(rd_cycle);
> +
> +	/* Write */
> +	t.adv_wr_off = gpmc_round_ns_to_ticks(adv_wr_off);
> +	t.we_on  = t.oe_on;
> +	if (cpu_is_omap34xx()) {
> +		t.wr_data_mux_bus = gpmc_round_ns_to_ticks(wr_data_mux_bus);
> +		t.wr_access = gpmc_round_ns_to_ticks(wr_access);
> +	}
> +	t.we_off = gpmc_round_ns_to_ticks(we_off);
> +	t.cs_wr_off = gpmc_round_ns_to_ticks(cs_wr_off);
> +	t.wr_cycle  = gpmc_round_ns_to_ticks(wr_cycle);
> +
> +	/* Configure GPMC */
> +	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
> +			GPMC_CONFIG1_DEVICESIZE(gpmc_nand_data->devsize) |
> +			GPMC_CONFIG1_DEVICETYPE_NAND);
> +
> +	err = gpmc_cs_set_timings(cs, &t);
> +	if (err)
> +		return err;
> +
> +	return 0;
> +}

How about allow passing timings from board-*.c file? This most likely will
work with only one type of NAND chip.

> +static int gpmc_nand_setup(void __iomem *nand_base)
> +{
> +	struct device *dev = &gpmc_nand_device.dev;
> +
> +	/* Set timings in GPMC */
> +	if (omap2_nand_gpmc_config(gpmc_nand_data->cs, nand_base) < 0) {
> +		dev_err(dev, "Unable to set gpmc timings\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +int __init gpmc_nand_init(struct omap_nand_platform_data *_nand_data)
> +{
> +	unsigned int val;
> +	int err	= 0;
> +	struct device *dev = &gpmc_nand_device.dev;
> +
> +	gpmc_nand_data = _nand_data;
> +	gpmc_nand_data->nand_setup = gpmc_nand_setup;
> +	gpmc_nand_device.dev.platform_data = gpmc_nand_data;
> +
> +	err = gpmc_nand_setup(gpmc_nand_data->gpmc_cs_baseaddr);
> +	if (err < 0) {
> +		dev_err(dev, "NAND platform setup failed: %d\n", err);
> +		return err;
> +	}
> +
> +	/* Enable RD PIN Monitoring Reg */
> +	if (gpmc_nand_data->dev_ready) {
> +		val  = gpmc_cs_read_reg(gpmc_nand_data->cs,
> +						 GPMC_CS_CONFIG1);
> +		val |= WR_RD_PIN_MONITORING;
> +		gpmc_cs_write_reg(gpmc_nand_data->cs,
> +						GPMC_CS_CONFIG1, val);
> +	}
> +
> +	err = platform_device_register(&gpmc_nand_device);
> +	if (err < 0) {
> +		dev_err(dev, "Unable to register NAND device\n");
> +		return err;
> +	}
> +
> +	return 0;
> +}

Looks like nothing is calling gpmc_nand_init. Please provide patches to
convert the users to call gpmc_nand_init.

And while at it, please fix the driver to call gpmc_cs_request.

Regards,

Tony


> diff --git a/arch/arm/plat-omap/include/plat/nand.h
> b/arch/arm/plat-omap/include/plat/nand.h
> index 631a7be..2ba9842 100644
> --- a/arch/arm/plat-omap/include/plat/nand.h
> +++ b/arch/arm/plat-omap/include/plat/nand.h
> @@ -21,4 +21,10 @@ struct omap_nand_platform_data {
>  	int			dma_channel;
>  	void __iomem		*gpmc_cs_baseaddr;
>  	void __iomem		*gpmc_baseaddr;
> +	int			devsize;
>  };
> +
> +/* size (4 KiB) for IO mapping */
> +#define	NAND_IO_SIZE	SZ_4K
> +
> +extern int gpmc_nand_init(struct omap_nand_platform_data *d);
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 7df303a..af028f7 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -30,12 +30,8 @@
> 
>  #define	DRIVER_NAME	"omap2-nand"
> 
> -/* size (4 KiB) for IO mapping */
> -#define	NAND_IO_SIZE	SZ_4K
> -
>  #define	NAND_WP_OFF	0
>  #define NAND_WP_BIT	0x00000010
> -#define WR_RD_PIN_MONITORING	0x00600000
> 
>  #define	GPMC_BUF_FULL	0x00000001
>  #define	GPMC_BUF_EMPTY	0x00000000
> @@ -885,8 +881,6 @@ static int __devinit omap_nand_probe(struct
>  	struct omap_nand_info		*info;
>  	struct omap_nand_platform_data	*pdata;
>  	int				err;
> -	unsigned long 			val;
> -
> 
>  	pdata = pdev->dev.platform_data;
>  	if (pdata == NULL) {
> @@ -913,24 +907,15 @@ static int __devinit omap_nand_probe(struct
>  	info->mtd.name		= dev_name(&pdev->dev);
>  	info->mtd.owner		= THIS_MODULE;
> 
> +	info->nand.options	|= pdata->devsize ? NAND_BUSWIDTH_16 : 0;
> +	info->nand.options	|= NAND_SKIP_BBTSCAN;
> +
>  	err = gpmc_cs_request(info->gpmc_cs, NAND_IO_SIZE, &info->phys_base);
>  	if (err < 0) {
>  		dev_err(&pdev->dev, "Cannot request GPMC CS\n");
>  		goto out_free_info;
>  	}
> 
> -	/* Enable RD PIN Monitoring Reg */
> -	if (pdata->dev_ready) {
> -		val  = gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1);
> -		val |= WR_RD_PIN_MONITORING;
> -		gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG1, val);
> -	}
> -
> -	val  = gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG7);
> -	val &= ~(0xf << 8);
> -	val |=  (0xc & 0xf) << 8;
> -	gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG7, val);
> -
>  	/* NAND write protect off */
>  	omap_nand_wp(&info->mtd, NAND_WP_OFF);
> 
> @@ -966,11 +951,6 @@ static int __devinit omap_nand_probe(struct
>  		info->nand.chip_delay = 50;
>  	}
> 
> -	info->nand.options  |= NAND_SKIP_BBTSCAN;
> -	if ((gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1) & 0x3000)
> -								== 0x1000)
> -		info->nand.options  |= NAND_BUSWIDTH_16;
> -
>  	if (use_prefetch) {
>  		/* copy the virtual address of nand base for fifo access */
>  		info->nand_pref_fifo_add = info->nand.IO_ADDR_R;
> -- 
> 1.5.5