Hi Igor,
On Wed, Nov 10, 2010 at 08:47:16AM +0200, Igor Grinberg wrote:
> On 11/10/10 04:19, Pavan Kondeti wrote:
> > On Tue, Nov 09, 2010 at 05:36:28PM +0200, Igor Grinberg wrote:
> >>
> >> On 11/09/10 15:52, Matthieu CASTET wrote:
> >>> Hi,
> >>>
> >>> Pavankumar Kondeti a écrit :
> >>>
> >>>> diff --git a/drivers/usb/gadget/msm72k_udc.c
> >>>> b/drivers/usb/gadget/msm72k_udc.c
> >>>> new file mode 100644
> >>>> index 0000000..3fa4192
> >>>> --- /dev/null
> >>>> +++ b/drivers/usb/gadget/msm72k_udc.c
> >>>> +
> >>>> +static unsigned ulpi_read(struct usb_info *ui, unsigned reg)
> >>>> +{
> >>>> + unsigned timeout = 100000;
> >>>> +
> >>>> + /* initiate read operation */
> >>>> + writel(ULPI_RUN | ULPI_READ | ULPI_ADDR(reg),
> >>>> + USB_ULPI_VIEWPORT);
> >>>> +
> >>>> + /* wait for completion */
> >>>> + while ((readl(USB_ULPI_VIEWPORT) & ULPI_RUN) && (--timeout))
> >>>> + ;
> >>>> +
> >>>> + if (timeout == 0) {
> >>>> + dev_err(&ui->pdev->dev, "ulpi_read: timeout %08x\n",
> >>>> + readl(USB_ULPI_VIEWPORT));
> >>>> + return 0xffffffff;
> >>>> + }
> >>>> + return ULPI_DATA_READ(readl(USB_ULPI_VIEWPORT));
> >>>> +}
> >>>> +
> >>>> +static int ulpi_write(struct usb_info *ui, unsigned val, unsigned reg)
> >>>> +{
> >>>> + unsigned timeout = 10000;
> >>>> +
> >>>> + /* initiate write operation */
> >>>> + writel(ULPI_RUN | ULPI_WRITE |
> >>>> + ULPI_ADDR(reg) | ULPI_DATA(val),
> >>>> + USB_ULPI_VIEWPORT);
> >>>> +
> >>>> + /* wait for completion */
> >>>> + while ((readl(USB_ULPI_VIEWPORT) & ULPI_RUN) && (--timeout))
> >>>> + ;
> >>>> +
> >>>> + if (timeout == 0) {
> >>>> + dev_err(&ui->pdev->dev, "ulpi_write: timeout\n");
> >>>> + return -1;
> >>>> + }
> >>>> +
> >>>> + return 0;
> >>>> +}
> >>>> +
> >>>> +static void ulpi_init(struct usb_info *ui)
> >>>> +{
> >>>> + int *seq = ui->phy_init_seq;
> >>>> +
> >>>> + if (!seq)
> >>>> + return;
> >>>> +
> >>>> + while (seq[0] >= 0) {
> >>>> + dev_vdbg(&ui->pdev->dev, "ulpi: write 0x%02x to
> >>>> 0x%02x\n",
> >>>> + seq[0], seq[1]);
> >>>> + ulpi_write(ui, seq[0], seq[1]);
> >>>> + seq += 2;
> >>>> + }
> >>>> +}
> >>>> +
> >>>
> >>> --- /dev/null
> >>> +++ b/drivers/usb/otg/msm72k_otg.c
> >>>
> >>> +
> >>> +#define ULPI_IO_TIMEOUT_USEC (10 * 1000)
> >>> +static int ulpi_read(struct otg_transceiver *otg, u32 reg)
> >>> +{
> >>> + int cnt = 0;
> >>> +
> >>> + /* initiate read operation */
> >>> + writel(ULPI_RUN | ULPI_READ | ULPI_ADDR(reg),
> >>> + USB_ULPI_VIEWPORT);
> >>> +
> >>> + /* wait for completion */
> >>> + while (cnt < ULPI_IO_TIMEOUT_USEC) {
> >>> + if (!(readl(USB_ULPI_VIEWPORT) & ULPI_RUN))
> >>> + break;
> >>> + udelay(1);
> >>> + cnt++;
> >>> + }
> >>> +
> >>> + if (cnt >= ULPI_IO_TIMEOUT_USEC) {
> >>> + dev_err(otg->dev, "ulpi_read: timeout %08x\n",
> >>> + readl(USB_ULPI_VIEWPORT));
> >>> + return -ETIMEDOUT;
> >>> + }
> >>> + return ULPI_DATA_READ(readl(USB_ULPI_VIEWPORT));
> >>> +}
> >>> +
> >>> +static int ulpi_write(struct otg_transceiver *otg, u32 val, u32 reg)
> >>> +{
> >>> + int cnt = 0;
> >>> +
> >>> + /* initiate write operation */
> >>> + writel(ULPI_RUN | ULPI_WRITE |
> >>> + ULPI_ADDR(reg) | ULPI_DATA(val),
> >>> + USB_ULPI_VIEWPORT);
> >>> +
> >>> + /* wait for completion */
> >>> + while (cnt < ULPI_IO_TIMEOUT_USEC) {
> >>> + if (!(readl(USB_ULPI_VIEWPORT) & ULPI_RUN))
> >>> + break;
> >>> + udelay(1);
> >>> + cnt++;
> >>> + }
> >>> +
> >>> + if (cnt >= ULPI_IO_TIMEOUT_USEC) {
> >>> + dev_err(otg->dev, "ulpi_write: timeout\n");
> >>> + return -ETIMEDOUT;
> >>> + }
> >>> + return 0;
> >>> +}
> >>> +
> >>> +static struct otg_io_access_ops msm_otg_io_ops = {
> >>> + .read = ulpi_read,
> >>> + .write = ulpi_write,
> >>> +};
> >>> +
> >>> +static void ulpi_init(struct msm_otg *motg)
> >>> +{
> >>> + struct msm_otg_platform_data *pdata = motg->pdata;
> >>> + int *seq = pdata->phy_init_seq;
> >>> +
> >>> + if (!seq)
> >>> + return;
> >>> +
> >>> + while (seq[0] >= 0) {
> >>> + dev_vdbg(motg->otg.dev, "ulpi: write 0x%02x to 0x%02x\n",
> >>> + seq[0], seq[1]);
> >>> + ulpi_write(&motg->otg, seq[0], seq[1]);
> >>> + seq += 2;
> >>> + }
> >>> +}
> >>>
> >>>
> >>> can't you share the ulpi fonctions from udc and otg ?
> >> The best would be to use the usb/otg/ulpi.c driver for the ulpi access.
> >>
> > This driver will eventually use msm72k_otg.c transceiver.
>
> Well, I mean, in addition to defining the struct otg_io_access_ops in some
> place,
> where both device and host drivers can share the same ops code, you can also
> use the ulpi generic driver as the protocol driver, instead of writing
> private code.
I have not looked at generic ULPI driver. I will see if we can re-use it in
our msm72k_otg.c.
> If the generic driver still lack some functionality, I can try to help you
> with this.
>
Sure. Thanks for offering help.
--
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