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Date:	Sat, 4 Jan 2014 01:50:02 +0100
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Apelete Seketeli <apelete@...eteli.net>
Cc:	linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH v3 1/2] usb: musb: add support for JZ4740 usb device controller

On Thu, Dec 19, 2013 at 9:42 PM, Apelete Seketeli <apelete@...eteli.net> wrote:
> Add support for Ingenic JZ4740 USB Device Controller through a
> specific musb glue layer.
>
> JZ4740 UDC not being OTG compatible and missing some hardware
> registers, this musb glue layer is written from scratch to be used in
> gadget mode only and take silicon design specifics into account.
>
> Signed-off-by: Apelete Seketeli <apelete@...eteli.net>
> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
> ---
>  drivers/usb/musb/Kconfig  |    8 +-
>  drivers/usb/musb/Makefile |    1 +
>  drivers/usb/musb/jz4740.c |  201 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 209 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/usb/musb/jz4740.c
>
> diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
> index 57dfc0c..14d7e72 100644
> --- a/drivers/usb/musb/Kconfig
> +++ b/drivers/usb/musb/Kconfig
> @@ -93,6 +93,12 @@ config USB_MUSB_BLACKFIN
>  config USB_MUSB_UX500
>         tristate "Ux500 platforms"
>
> +config USB_MUSB_JZ4740
> +       tristate "JZ4740"
> +       depends on MACH_JZ4740 || COMPILE_TEST
> +       depends on USB_MUSB_GADGET
> +       depends on USB_OTG_BLACKLIST_HUB
> +
>  endchoice
>
>  config USB_MUSB_AM335X_CHILD
> @@ -100,7 +106,7 @@ config USB_MUSB_AM335X_CHILD
>
>  choice
>         prompt 'MUSB DMA mode'
> -       default MUSB_PIO_ONLY if ARCH_MULTIPLATFORM
> +       default MUSB_PIO_ONLY if ARCH_MULTIPLATFORM || USB_MUSB_JZ4740

Just out of curiosity, why can't we use DMA?

>         default USB_UX500_DMA if USB_MUSB_UX500
>         default USB_INVENTRA_DMA if USB_MUSB_OMAP2PLUS || USB_MUSB_BLACKFIN
>         default USB_TI_CPPI_DMA if USB_MUSB_DAVINCI
> diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
> index c5ea5c6..ba49501 100644
> --- a/drivers/usb/musb/Makefile
> +++ b/drivers/usb/musb/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_USB_MUSB_DAVINCI)                        += davinci.o
>  obj-$(CONFIG_USB_MUSB_DA8XX)                   += da8xx.o
>  obj-$(CONFIG_USB_MUSB_BLACKFIN)                        += blackfin.o
>  obj-$(CONFIG_USB_MUSB_UX500)                   += ux500.o
> +obj-$(CONFIG_USB_MUSB_JZ4740)                  += jz4740.o
>
>
>  obj-$(CONFIG_USB_MUSB_AM335X_CHILD)            += musb_am335x.o
> diff --git a/drivers/usb/musb/jz4740.c b/drivers/usb/musb/jz4740.c
> new file mode 100644
> index 0000000..5f30537
> --- /dev/null
> +++ b/drivers/usb/musb/jz4740.c
> @@ -0,0 +1,201 @@
> +/*
> + * Ingenic JZ4740 "glue layer"
> + *
> + * Copyright (C) 2013, Apelete Seketeli <apelete@...eteli.net>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/errno.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#include "musb_core.h"
> +
> +struct jz4740_glue {
> +       struct device           *dev;
> +       struct platform_device  *musb;
> +       struct clk              *clk;
> +};
> +
> +static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
> +{
> +       unsigned long   flags;
> +       irqreturn_t     retval = IRQ_NONE;
> +       struct musb     *musb = __hci;
> +
> +       spin_lock_irqsave(&musb->lock, flags);
> +
> +       musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
> +       musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
> +       musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
> +
> +       /*
> +        * The controller is gadget only, the state of the host mode IRQ bits is
> +        * undefined. Mask them to make sure that the musb driver core will
> +        * never see them set
> +        */
> +       musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
> +           MUSB_INTR_RESET | MUSB_INTR_SOF;
> +
> +       if (musb->int_usb || musb->int_tx || musb->int_rx)
> +               retval = musb_interrupt(musb);
> +
> +       spin_unlock_irqrestore(&musb->lock, flags);
> +
> +       return retval;
> +}
> +
> +static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
> +{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
> +{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
> +{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
> +};
> +
> +static struct musb_hdrc_config jz4740_musb_config = {
> +       /* Silicon does not implement USB OTG. */
> +       .multipoint = 0,
> +       /* Max EPs scanned, driver will decide which EP can be used. */
> +       .num_eps    = 4,
> +       /* RAMbits needed to configure EPs from table */
> +       .ram_bits   = 9,
> +       .fifo_cfg = jz4740_musb_fifo_cfg,
> +       .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
> +};
> +
> +static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
> +       .mode   = MUSB_PERIPHERAL,
> +       .config = &jz4740_musb_config,
> +};
> +
> +static int jz4740_musb_init(struct musb *musb)
> +{
> +       musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
> +       if (!musb->xceiv) {
> +               pr_err("HS UDC: no transceiver configured\n");
> +               return -ENODEV;
> +       }
> +
> +       /* Silicon does not implement ConfigData register.
> +        * Set dyn_fifo to avoid reading EP config from hardware.
> +        */
> +       musb->dyn_fifo = true;
> +
> +       musb->isr = jz4740_musb_interrupt;
> +
> +       return 0;
> +}
> +
> +static int jz4740_musb_exit(struct musb *musb)
> +{
> +       usb_put_phy(musb->xceiv);
> +
> +       return 0;
> +}
> +
> +static const struct musb_platform_ops jz4740_musb_ops = {
> +       .init           = jz4740_musb_init,
> +       .exit           = jz4740_musb_exit,
> +};
> +
> +static int jz4740_probe(struct platform_device *pdev)
> +{
> +       struct musb_hdrc_platform_data  *pdata = &jz4740_musb_platform_data;
> +       struct platform_device          *musb;
> +       struct jz4740_glue              *glue;
> +       struct clk                      *clk;
> +       int                             ret;
> +
> +       glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
> +       if (!glue)
> +               return -ENOMEM;
> +
> +       musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
> +       if (!musb) {
> +               dev_err(&pdev->dev, "failed to allocate musb device\n");
> +               return -ENOMEM;
> +       }
> +
> +       clk = devm_clk_get(&pdev->dev, "udc");
> +       if (IS_ERR(clk)) {
> +               dev_err(&pdev->dev, "failed to get clock\n");
> +               ret = PTR_ERR(clk);
> +               goto err_platform_device_put;
> +       }
> +
> +       ret = clk_prepare_enable(clk);
> +       if (ret) {
> +               dev_err(&pdev->dev, "failed to enable clock\n");
> +               goto err_platform_device_put;
> +       }
> +
> +       musb->dev.parent                = &pdev->dev;
> +
> +       glue->dev                       = &pdev->dev;
> +       glue->musb                      = musb;
> +       glue->clk                       = clk;
> +
> +       pdata->platform_ops             = &jz4740_musb_ops;
> +
> +       platform_set_drvdata(pdev, glue);
> +
> +       ret = platform_device_add_resources(musb, pdev->resource,
> +                                           pdev->num_resources);
> +       if (ret) {
> +               dev_err(&pdev->dev, "failed to add resources\n");
> +               goto err_clk_disable;
> +       }
> +
> +       ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
> +       if (ret) {
> +               dev_err(&pdev->dev, "failed to add platform_data\n");
> +               goto err_clk_disable;
> +       }
> +
> +       ret = platform_device_add(musb);
> +       if (ret) {
> +               dev_err(&pdev->dev, "failed to register musb device\n");
> +               goto err_clk_disable;
> +       }
> +
> +       return 0;
> +
> +err_clk_disable:
> +       clk_disable_unprepare(clk);
> +err_platform_device_put:
> +       platform_device_put(musb);
> +       return ret;
> +}
> +
> +static int jz4740_remove(struct platform_device *pdev)
> +{
> +       struct jz4740_glue      *glue = platform_get_drvdata(pdev);
> +
> +       platform_device_unregister(glue->musb);
> +       clk_disable_unprepare(glue->clk);
> +
> +       return 0;
> +}
> +
> +static struct platform_driver jz4740_driver = {
> +       .probe          = jz4740_probe,
> +       .remove         = jz4740_remove,
> +       .driver         = {
> +               .name   = "musb-jz4740",
> +       },
> +};
> +
> +MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
> +MODULE_AUTHOR("Apelete Seketeli <apelete@...eteli.net>");
> +MODULE_LICENSE("GPL v2");
> +module_platform_driver(jz4740_driver);
> --
> 1.7.10.4
>
> --
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-- 
Thanks,
//richard
--
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