Re: [PATCH v4 1/2] memory: ti-aemif: introduce AEMIF driver

Greg KH
2014-02-18T20:29:29Z

On Wed, Feb 05, 2014 at 09:46:13PM +0200, Ivan Khoronzhuk wrote:
> Add new AEMIF driver for EMIF16 Texas Instruments controller.
> The EMIF16 module is intended to provide a glue-less interface to
> a variety of asynchronous memory devices like ASRA M, NOR and NAND
> memory. A total of 256M bytes of any of these memories can be
> accessed at any given time via 4 chip selects with 64M byte access
> per chip select.
>
> Synchronous memories such as DDR1 SD RAM, SDR SDRAM and Mobile SDR
> are not supported.
>
> This controller is used on SoCs like Davinci, Keysone2
>
> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com
> Signed-off-by: [initial author] Murali Karicheri <m-karicheri2@ti.com>

What's this [] stuff?

If Murali wrote this, that name needs to be in a "From:" line in the
patch to properly attribute it, and drop the [] here.

> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>
> ---
> drivers/memory/Kconfig | 11 ++
> drivers/memory/Makefile | 1 +
> drivers/memory/ti-aemif.c | 429 ++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 441 insertions(+)
> create mode 100644 drivers/memory/ti-aemif.c
>
> diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
> index 29a11db..7bc3982 100644
> --- a/drivers/memory/Kconfig
> +++ b/drivers/memory/Kconfig
> @@ -7,6 +7,17 @@ menuconfig MEMORY
>
> if MEMORY
>
> +config TI_AEMIF
> + tristate "Texas Instruments AEMIF driver"
> + depends on (ARCH_DAVINCI || ARCH_KEYSTONE) && OF
> + help
> + This driver is for the AEMIF module available in Texas Instruments
> + SoCs. AEMIF stands for Asynchronous External Memory Interface and
> + is intended to provide a glue-less interface to a variety of
> + asynchronuous memory devices like ASRAM, NOR and NAND memory. A total
> + of 256M bytes of any of these memories can be accessed at a given
> + time via four chip selects with 64M byte access per chip select.
> +
> config TI_EMIF
> tristate "Texas Instruments EMIF driver"
> depends on ARCH_OMAP2PLUS
> diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
> index 969d923..d4e150c 100644
> --- a/drivers/memory/Makefile
> +++ b/drivers/memory/Makefile
> @@ -5,6 +5,7 @@
> ifeq ($(CONFIG_DDR),y)
> obj-$(CONFIG_OF) += of_memory.o
> endif
> +obj-$(CONFIG_TI_AEMIF) += ti-aemif.o
> obj-$(CONFIG_TI_EMIF) += emif.o
> obj-$(CONFIG_MVEBU_DEVBUS) += mvebu-devbus.o
> obj-$(CONFIG_TEGRA20_MC) += tegra20-mc.o
> diff --git a/drivers/memory/ti-aemif.c b/drivers/memory/ti-aemif.c
> new file mode 100644
> index 0000000..8d15d87
> --- /dev/null
> +++ b/drivers/memory/ti-aemif.c
> @@ -0,0 +1,429 @@
> +/*
> + * TI AEMIF driver
> + *
> + * Copyright (C) 2010 - 2013 Texas Instruments Incorporated. http://www.ti.com/
> + *
> + * Authors:
> + * Murali Karicheri <m-karicheri2@ti.com>
> + * Ivan Khoronzhuk <ivan.khoronzhuk@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/clk.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +
> +#define TA_SHIFT 2
> +#define RHOLD_SHIFT 4
> +#define RSTROBE_SHIFT 7
> +#define RSETUP_SHIFT 13
> +#define WHOLD_SHIFT 17
> +#define WSTROBE_SHIFT 20
> +#define WSETUP_SHIFT 26
> +#define EW_SHIFT 30
> +#define SS_SHIFT 31
> +
> +#define TA(x) ((x) << TA_SHIFT)
> +#define RHOLD(x) ((x) << RHOLD_SHIFT)
> +#define RSTROBE(x) ((x) << RSTROBE_SHIFT)
> +#define RSETUP(x) ((x) << RSETUP_SHIFT)
> +#define WHOLD(x) ((x) << WHOLD_SHIFT)
> +#define WSTROBE(x) ((x) << WSTROBE_SHIFT)
> +#define WSETUP(x) ((x) << WSETUP_SHIFT)
> +#define EW(x) ((x) << EW_SHIFT)
> +#define SS(x) ((x) << SS_SHIFT)
> +
> +#define ASIZE_MAX 0x1
> +#define TA_MAX 0x3
> +#define RHOLD_MAX 0x7
> +#define RSTROBE_MAX 0x3f
> +#define RSETUP_MAX 0xf
> +#define WHOLD_MAX 0x7
> +#define WSTROBE_MAX 0x3f
> +#define WSETUP_MAX 0xf
> +#define EW_MAX 0x1
> +#define SS_MAX 0x1
> +#define NUM_CS 4
> +
> +#define TA_VAL(x) (((x) & TA(TA_MAX)) >> TA_SHIFT)
> +#define RHOLD_VAL(x) (((x) & RHOLD(RHOLD_MAX)) >> RHOLD_SHIFT)
> +#define RSTROBE_VAL(x) (((x) & RSTROBE(RSTROBE_MAX)) >> RSTROBE_SHIFT)
> +#define RSETUP_VAL(x) (((x) & RSETUP(RSETUP_MAX)) >> RSETUP_SHIFT)
> +#define WHOLD_VAL(x) (((x) & WHOLD(WHOLD_MAX)) >> WHOLD_SHIFT)
> +#define WSTROBE_VAL(x) (((x) & WSTROBE(WSTROBE_MAX)) >> WSTROBE_SHIFT)
> +#define WSETUP_VAL(x) (((x) & WSETUP(WSETUP_MAX)) >> WSETUP_SHIFT)
> +#define EW_VAL(x) (((x) & EW(EW_MAX)) >> EW_SHIFT)
> +#define SS_VAL(x) (((x) & SS(SS_MAX)) >> SS_SHIFT)
> +
> +#define NRCSR_OFFSET 0x00
> +#define AWCCR_OFFSET 0x04
> +#define A1CR_OFFSET 0x10
> +
> +#define ACR_ASIZE_MASK 0x3
> +#define ACR_EW_MASK BIT(30)
> +#define ACR_SS_MASK BIT(31)
> +#define ASIZE_16BIT 1
> +
> +#define CONFIG_MASK (TA(TA_MAX) | \
> + RHOLD(RHOLD_MAX) | \
> + RSTROBE(RSTROBE_MAX) | \
> + RSETUP(RSETUP_MAX) | \
> + WHOLD(WHOLD_MAX) | \
> + WSTROBE(WSTROBE_MAX) | \
> + WSETUP(WSETUP_MAX) | \
> + EW(EW_MAX) | SS(SS_MAX) | \
> + ASIZE_MAX)
> +
> +#define DRV_NAME "ti-aemif"

What's wrong with KBUILD_MODNAME?

> +static int aemif_probe(struct platform_device *pdev)
> +{
> + int ret = -ENODEV, i;

Extra spaces?

Split this into two lines?

> + struct resource *res;
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + struct device_node *child_np;
> + struct aemif_device *aemif;
> +
> + if (np == NULL)
> + return 0;
> +
> + aemif = devm_kzalloc(dev, sizeof(*aemif), GFP_KERNEL);
> + if (!aemif) {
> + dev_err(dev, "cannot allocate memory for aemif\n");

Not needed, you'll get a message from kzalloc about this.

> + return -ENOMEM;
> + }
> +
> + platform_set_drvdata(pdev, aemif);
> +
> + aemif->clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(aemif->clk)) {
> + dev_err(dev, "cannot get clock 'aemif'\n");
> + return PTR_ERR(aemif->clk);

No freeing memory?

> + }
> +
> + clk_prepare_enable(aemif->clk);
> + aemif->clk_rate = clk_get_rate(aemif->clk) / MSEC_PER_SEC;
> +
> + if (of_device_is_compatible(np, "ti,da850-aemif"))
> + aemif->cs_offset = 2;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + aemif->base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(aemif->base)) {
> + ret = PTR_ERR(aemif->base);
> + goto error;
> + }
> +
> + /*
> + * For every controller device node, there is a cs device node that
> + * describe the bus configuration parameters. This functions iterate
> + * over these nodes and update the cs data array.
> + */
> + for_each_available_child_of_node(np, child_np) {
> + ret = of_aemif_parse_abus_config(pdev, child_np);
> + if (ret < 0)
> + goto error;
> + }
> +
> + for (i = 0; i < aemif->num_cs; i++) {
> + ret = aemif_config_abus(pdev, i);
> + if (ret < 0) {
> + dev_err(dev, "Error configuring chip select %d\n",
> + aemif->cs_data[i].cs);
> + goto error;
> + }
> + }
> +
> + /*
> + * Create a child devices explicitly from here to
> + * guarantee that the child will be probed after the AEMIF timing
> + * parameters are set.
> + */
> + for_each_available_child_of_node(np, child_np) {
> + ret = of_platform_populate(child_np, NULL, NULL, dev);
> + if (ret < 0)
> + goto error;
> + }
> +
> + return 0;
> +error:
> + clk_disable_unprepare(aemif->clk);
> + return ret;

No freeing memory?

> +}
> +
> +static int aemif_remove(struct platform_device *pdev)
> +{
> + struct aemif_device *aemif = platform_get_drvdata(pdev);
> + clk_disable_unprepare(aemif->clk);

Extra line needed.

> + return 0;
> +}

thanks,

greg k-h