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usb: cdns3: drd: simplify *switch_gadet and *switch_host 

Patch split function cdns3_drd_switch_gadget and
cdns3_drd_switch_host into:
- cdns3_drd_host_on
- cdns3_drd_host_off
- cdns3_drd_gadget_on
- cdns3_drd_gadgett_off

These functions don't have any shared code so it's better to
have smaller, faster and easier functions.

Signed-off-by: Pawel Laszczak <pawell@cadence.com>
Reviewed-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Pawel Laszczak 2020-07-13 12:05:54 +02:00 committed by Felipe Balbi
parent f41ca26b8b
commit b2aeb6da3d
4 changed files with 80 additions and 66 deletions
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132
drivers/usb/cdns3/drd.c
View File

@ -124,83 +124,95 @@ static void cdns3_otg_enable_irq(struct cdns3 *cdns)
}
/**
* cdns3_drd_switch_host - start/stop host
* @cdns: Pointer to controller context structure
* @on: 1 for start, 0 for stop
* cdns3_drd_host_on - start host.
* @cdns: Pointer to controller context structure.
*
* Returns 0 on success otherwise negative errno.
*/
int cdns3_drd_host_on(struct cdns3 *cdns)
{
u32 val;
int ret;
/* Enable host mode. */
writel(OTGCMD_HOST_BUS_REQ | OTGCMD_OTG_DIS,
&cdns->otg_regs->cmd);
dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n");
ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
val & OTGSTS_XHCI_READY, 1, 100000);
if (ret)
dev_err(cdns->dev, "timeout waiting for xhci_ready\n");
return ret;
}
/**
* cdns3_drd_host_off - stop host.
* @cdns: Pointer to controller context structure.
*/
void cdns3_drd_host_off(struct cdns3 *cdns)
{
u32 val;
writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
&cdns->otg_regs->cmd);
/* Waiting till H_IDLE state.*/
readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
!(val & OTGSTATE_HOST_STATE_MASK),
1, 2000000);
}
/**
* cdns3_drd_gadget_on - start gadget.
* @cdns: Pointer to controller context structure.
*
* Returns 0 on success otherwise negative errno
*/
int cdns3_drd_switch_host(struct cdns3 *cdns, int on)
int cdns3_drd_gadget_on(struct cdns3 *cdns)
{
int ret, val;
u32 reg = OTGCMD_OTG_DIS;
/* switch OTG core */
if (on) {
writel(OTGCMD_HOST_BUS_REQ | OTGCMD_OTG_DIS,
&cdns->otg_regs->cmd);
writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd);
dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n");
ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
val & OTGSTS_XHCI_READY,
1, 100000);
if (ret) {
dev_err(cdns->dev, "timeout waiting for xhci_ready\n");
return ret;
}
} else {
writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
&cdns->otg_regs->cmd);
/* Waiting till H_IDLE state.*/
readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
!(val & OTGSTATE_HOST_STATE_MASK),
1, 2000000);
dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n");
ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
val & OTGSTS_DEV_READY,
1, 100000);
if (ret) {
dev_err(cdns->dev, "timeout waiting for dev_ready\n");
return ret;
}
return 0;
}
/**
* cdns3_drd_switch_gadget - start/stop gadget
* @cdns: Pointer to controller context structure
* @on: 1 for start, 0 for stop
*
* Returns 0 on success otherwise negative errno
* cdns3_drd_gadget_off - stop gadget.
* @cdns: Pointer to controller context structure.
*/
int cdns3_drd_switch_gadget(struct cdns3 *cdns, int on)
void cdns3_drd_gadget_off(struct cdns3 *cdns)
{
int ret, val;
u32 reg = OTGCMD_OTG_DIS;
u32 val;
/* switch OTG core */
if (on) {
writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd);
dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n");
ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
val & OTGSTS_DEV_READY,
1, 100000);
if (ret) {
dev_err(cdns->dev, "timeout waiting for dev_ready\n");
return ret;
}
} else {
/*
* driver should wait at least 10us after disabling Device
* before turning-off Device (DEV_BUS_DROP)
*/
usleep_range(20, 30);
writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
&cdns->otg_regs->cmd);
/* Waiting till DEV_IDLE state.*/
readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
!(val & OTGSTATE_DEV_STATE_MASK),
1, 2000000);
}
return 0;
/*
* Driver should wait at least 10us after disabling Device
* before turning-off Device (DEV_BUS_DROP).
*/
usleep_range(20, 30);
writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
&cdns->otg_regs->cmd);
/* Waiting till DEV_IDLE state.*/
readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
!(val & OTGSTATE_DEV_STATE_MASK),
1, 2000000);
}
/**

6
drivers/usb/cdns3/drd.h
View File

@ -163,8 +163,10 @@ int cdns3_get_vbus(struct cdns3 *cdns);
int cdns3_drd_init(struct cdns3 *cdns);
int cdns3_drd_exit(struct cdns3 *cdns);
int cdns3_drd_update_mode(struct cdns3 *cdns);
int cdns3_drd_switch_gadget(struct cdns3 *cdns, int on);
int cdns3_drd_switch_host(struct cdns3 *cdns, int on);
int cdns3_drd_gadget_on(struct cdns3 *cdns);
void cdns3_drd_gadget_off(struct cdns3 *cdns);
int cdns3_drd_host_on(struct cdns3 *cdns);
void cdns3_drd_host_off(struct cdns3 *cdns);
int cdns3_set_mode(struct cdns3 *cdns, enum usb_dr_mode mode);
#endif /* __LINUX_CDNS3_DRD */

4
drivers/usb/cdns3/gadget.c
View File

@ -3017,7 +3017,7 @@ void cdns3_gadget_exit(struct cdns3 *cdns)
kfree(priv_dev->zlp_buf);
kfree(priv_dev);
cdns->gadget_dev = NULL;
cdns3_drd_switch_gadget(cdns, 0);
cdns3_drd_gadget_off(cdns);
}
static int cdns3_gadget_start(struct cdns3 *cdns)
@ -3148,7 +3148,7 @@ static int __cdns3_gadget_init(struct cdns3 *cdns)
return ret;
}
cdns3_drd_switch_gadget(cdns, 1);
cdns3_drd_gadget_on(cdns);
pm_runtime_get_sync(cdns->dev);
ret = cdns3_gadget_start(cdns);

4
drivers/usb/cdns3/host.c
View File

@ -19,7 +19,7 @@ static int __cdns3_host_init(struct cdns3 *cdns)
struct platform_device *xhci;
int ret;
cdns3_drd_switch_host(cdns, 1);
cdns3_drd_host_on(cdns);
xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
if (!xhci) {
@ -53,7 +53,7 @@ static void cdns3_host_exit(struct cdns3 *cdns)
{
platform_device_unregister(cdns->host_dev);
cdns->host_dev = NULL;
cdns3_drd_switch_host(cdns, 0);
cdns3_drd_host_off(cdns);
}
int cdns3_host_init(struct cdns3 *cdns)