Skip to content

Commit

Permalink
phy: rcar-gen3-usb2: change the mode to OTG on the combined channel
Browse files Browse the repository at this point in the history
To use the channel 0 of R-Car gen3 as periperal mode, This patch changes
the mode to OTG instead of HOST. Then, this driver needs to set some
registers to enable host mode and detects ID pin and VBUS pin at
phy_init() timing.

For now, the channel 0 can be used as host mode only.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
  • Loading branch information
Yoshihiro Shimoda authored and Kishon Vijay Abraham I committed Dec 20, 2015
1 parent f3b5a8d commit 1114e2d
Showing 1 changed file with 122 additions and 2 deletions.
124 changes: 122 additions & 2 deletions drivers/phy/phy-rcar-gen3-usb2.c
Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,10 @@
#define USB2_USBCTR 0x00c
#define USB2_SPD_RSM_TIMSET 0x10c
#define USB2_OC_TIMSET 0x110
#define USB2_COMMCTRL 0x600
#define USB2_VBCTRL 0x60c
#define USB2_LINECTRL1 0x610
#define USB2_ADPCTRL 0x630

/* INT_ENABLE */
#define USB2_INT_ENABLE_USBH_INTB_EN BIT(2)
Expand All @@ -41,6 +45,24 @@
/* OC_TIMSET */
#define USB2_OC_TIMSET_INIT 0x000209ab

/* COMMCTRL */
#define USB2_COMMCTRL_OTG_PERI BIT(31) /* 1 = Peripheral mode */

/* VBCTRL */
#define USB2_VBCTRL_DRVVBUSSEL BIT(8)

/* LINECTRL1 */
#define USB2_LINECTRL1_DPRPD_EN BIT(19)
#define USB2_LINECTRL1_DP_RPD BIT(18)
#define USB2_LINECTRL1_DMRPD_EN BIT(17)
#define USB2_LINECTRL1_DM_RPD BIT(16)

/* ADPCTRL */
#define USB2_ADPCTRL_OTGSESSVLD BIT(20)
#define USB2_ADPCTRL_IDDIG BIT(19)
#define USB2_ADPCTRL_IDPULLUP BIT(5) /* 1 = ID sampling is enabled */
#define USB2_ADPCTRL_DRVVBUS BIT(4)

/******* HSUSB registers (original offset is +0x100) *******/
#define HSUSB_LPSTS 0x02
#define HSUSB_UGCTRL2 0x84
Expand All @@ -66,6 +88,102 @@ struct rcar_gen3_chan {
struct phy *phy;
};

static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
{
void __iomem *usb2_base = ch->usb2.base;
u32 val = readl(usb2_base + USB2_COMMCTRL);

dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, host);
if (host)
val &= ~USB2_COMMCTRL_OTG_PERI;
else
val |= USB2_COMMCTRL_OTG_PERI;
writel(val, usb2_base + USB2_COMMCTRL);
}

static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
{
void __iomem *usb2_base = ch->usb2.base;
u32 val = readl(usb2_base + USB2_LINECTRL1);

dev_vdbg(&ch->phy->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
val &= ~(USB2_LINECTRL1_DP_RPD | USB2_LINECTRL1_DM_RPD);
if (dp)
val |= USB2_LINECTRL1_DP_RPD;
if (dm)
val |= USB2_LINECTRL1_DM_RPD;
writel(val, usb2_base + USB2_LINECTRL1);
}

static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
{
void __iomem *usb2_base = ch->usb2.base;
u32 val = readl(usb2_base + USB2_ADPCTRL);

dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, vbus);
if (vbus)
val |= USB2_ADPCTRL_DRVVBUS;
else
val &= ~USB2_ADPCTRL_DRVVBUS;
writel(val, usb2_base + USB2_ADPCTRL);
}

static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
{
rcar_gen3_set_linectrl(ch, 1, 1);
rcar_gen3_set_host_mode(ch, 1);
rcar_gen3_enable_vbus_ctrl(ch, 1);
}

static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
{
rcar_gen3_set_linectrl(ch, 0, 1);
rcar_gen3_set_host_mode(ch, 0);
rcar_gen3_enable_vbus_ctrl(ch, 0);
}

static bool rcar_gen3_check_vbus(struct rcar_gen3_chan *ch)
{
return !!(readl(ch->usb2.base + USB2_ADPCTRL) &
USB2_ADPCTRL_OTGSESSVLD);
}

static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
{
return !!(readl(ch->usb2.base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
}

static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
{
bool is_host = true;

/* B-device? */
if (rcar_gen3_check_id(ch) && rcar_gen3_check_vbus(ch))
is_host = false;

if (is_host)
rcar_gen3_init_for_host(ch);
else
rcar_gen3_init_for_peri(ch);
}

static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
{
void __iomem *usb2_base = ch->usb2.base;
u32 val;

val = readl(usb2_base + USB2_VBCTRL);
writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
val = readl(usb2_base + USB2_ADPCTRL);
writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
val = readl(usb2_base + USB2_LINECTRL1);
rcar_gen3_set_linectrl(ch, 0, 0);
writel(val | USB2_LINECTRL1_DPRPD_EN | USB2_LINECTRL1_DMRPD_EN,
usb2_base + USB2_LINECTRL1);

rcar_gen3_device_recognition(ch);
}

static int rcar_gen3_phy_usb2_init(struct phy *p)
{
struct rcar_gen3_chan *channel = phy_get_drvdata(p);
Expand All @@ -80,11 +198,13 @@ static int rcar_gen3_phy_usb2_init(struct phy *p)

/* Initialize HSUSB part */
if (hsusb_base) {
/* TODO: support "OTG" mode */
val = readl(hsusb_base + HSUSB_UGCTRL2);
val = (val & ~HSUSB_UGCTRL2_USB0SEL) |
HSUSB_UGCTRL2_USB0SEL_HOST;
HSUSB_UGCTRL2_USB0SEL_OTG;
writel(val & HSUSB_UGCTRL2_MASK, hsusb_base + HSUSB_UGCTRL2);

/* Initialize otg part */
rcar_gen3_init_otg(channel);
}

return 0;
Expand Down

0 comments on commit 1114e2d

Please sign in to comment.