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.
--
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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