[PATCH] usb: dwc2: Refactor register operations with clrsetbits macros
Junhui Liu
junhui.liu at pigmoral.tech
Sun Jan 26 09:29:59 CET 2025
Refactor DWC2 USB gadget driver to replace manual read-modify-write
operations with `clrsetbits_le32`, `setbits_le32`, and `clrbits_le32`
macros, which simplify the code and improve readability.
Signed-off-by: Junhui Liu <junhui.liu at pigmoral.tech>
---
This patch is a supplement of patch series [1].
[1] https://lore.kernel.org/u-boot/20250110-dwc2-dev-v4-0-987f4fd6f8b2@pigmoral.tech
---
drivers/usb/gadget/dwc2_udc_otg.c | 16 ++------
drivers/usb/gadget/dwc2_udc_otg_phy.c | 33 ++++++----------
drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c | 63 +++++++-----------------------
3 files changed, 31 insertions(+), 81 deletions(-)
diff --git a/drivers/usb/gadget/dwc2_udc_otg.c b/drivers/usb/gadget/dwc2_udc_otg.c
index c3fdc81e9096bb216b63ff0ac672d216bed3f23d..40393141ca95b8947712a8996727391fe8742275 100644
--- a/drivers/usb/gadget/dwc2_udc_otg.c
+++ b/drivers/usb/gadget/dwc2_udc_otg.c
@@ -465,7 +465,6 @@ static void reconfig_usbd(struct dwc2_udc *dev)
{
/* 2. Soft-reset OTG Core and then unreset again. */
int i;
- unsigned int uTemp;
u32 dflt_gusbcfg;
u32 rx_fifo_sz, tx_fifo_sz, np_tx_fifo_sz;
u32 max_hw_ep;
@@ -497,16 +496,12 @@ static void reconfig_usbd(struct dwc2_udc *dev)
writel(dflt_gusbcfg, ®->global_regs.gusbcfg);
/* 3. Put the OTG device core in the disconnected state.*/
- uTemp = readl(®->device_regs.dctl);
- uTemp |= DCTL_SFTDISCON;
- writel(uTemp, ®->device_regs.dctl);
+ setbits_le32(®->device_regs.dctl, DCTL_SFTDISCON);
udelay(20);
/* 4. Make the OTG device core exit from the disconnected state.*/
- uTemp = readl(®->device_regs.dctl);
- uTemp = uTemp & ~DCTL_SFTDISCON;
- writel(uTemp, ®->device_regs.dctl);
+ clrbits_le32(®->device_regs.dctl, DCTL_SFTDISCON);
/* 5. Configure OTG Core to initial settings of device mode.*/
/* [][1: full speed(30Mhz) 0:high speed]*/
@@ -592,7 +587,6 @@ static void reconfig_usbd(struct dwc2_udc *dev)
static void set_max_pktsize(struct dwc2_udc *dev, enum usb_device_speed speed)
{
- unsigned int ep_ctrl;
int i;
if (speed == USB_SPEED_HIGH) {
@@ -612,12 +606,10 @@ static void set_max_pktsize(struct dwc2_udc *dev, enum usb_device_speed speed)
dev->ep[i].ep.maxpacket = ep_fifo_size;
/* EP0 - Control IN (64 bytes)*/
- ep_ctrl = readl(®->device_regs.in_endp[EP0_CON].diepctl);
- writel(ep_ctrl | (0 << 0), ®->device_regs.in_endp[EP0_CON].diepctl);
+ setbits_le32(®->device_regs.in_endp[EP0_CON].diepctl, (0 << 0));
/* EP0 - Control OUT (64 bytes)*/
- ep_ctrl = readl(®->device_regs.out_endp[EP0_CON].doepctl);
- writel(ep_ctrl | (0 << 0), ®->device_regs.out_endp[EP0_CON].doepctl);
+ setbits_le32(®->device_regs.out_endp[EP0_CON].doepctl, (0 << 0));
}
static int dwc2_ep_enable(struct usb_ep *_ep,
diff --git a/drivers/usb/gadget/dwc2_udc_otg_phy.c b/drivers/usb/gadget/dwc2_udc_otg_phy.c
index c7eea7b34421ad9bde86d42334852d2f21a133e8..e0ac5d142b0610461408754a59bfd2aa09848407 100644
--- a/drivers/usb/gadget/dwc2_udc_otg_phy.c
+++ b/drivers/usb/gadget/dwc2_udc_otg_phy.c
@@ -48,29 +48,24 @@ void otg_phy_init(struct dwc2_udc *dev)
printf("USB PHY0 Enable\n");
/* Enable PHY */
- writel(readl(usb_phy_ctrl) | USB_PHY_CTRL_EN0, usb_phy_ctrl);
+ setbits_le32(usb_phy_ctrl, USB_PHY_CTRL_EN0);
if (dev->pdata->usb_flags == PHY0_SLEEP) /* C210 Universal */
- writel((readl(&phy->phypwr)
- &~(PHY_0_SLEEP | OTG_DISABLE_0 | ANALOG_PWRDOWN)
- &~FORCE_SUSPEND_0), &phy->phypwr);
+ clrbits_le32(&phy->phypwr, PHY_0_SLEEP | OTG_DISABLE_0 |
+ ANALOG_PWRDOWN | FORCE_SUSPEND_0);
else /* C110 GONI */
- writel((readl(&phy->phypwr) &~(OTG_DISABLE_0 | ANALOG_PWRDOWN)
- &~FORCE_SUSPEND_0), &phy->phypwr);
+ clrbits_le32(&phy->phypwr, OTG_DISABLE_0 | ANALOG_PWRDOWN | FORCE_SUSPEND_0);
if (s5p_cpu_id == 0x4412)
- writel((readl(&phy->phyclk) & ~(EXYNOS4X12_ID_PULLUP0 |
- EXYNOS4X12_COMMON_ON_N0)) | EXYNOS4X12_CLK_SEL_24MHZ,
- &phy->phyclk); /* PLL 24Mhz */
+ clrsetbits_le32(&phy->phyclk, EXYNOS4X12_ID_PULLUP0 | EXYNOS4X12_COMMON_ON_N0,
+ EXYNOS4X12_CLK_SEL_24MHZ); /* PLL 24Mhz */
else
- writel((readl(&phy->phyclk) & ~(ID_PULLUP0 | COMMON_ON_N0)) |
- CLK_SEL_24MHZ, &phy->phyclk); /* PLL 24Mhz */
+ clrsetbits_le32(&phy->phyclk, ID_PULLUP0 | COMMON_ON_N0,
+ CLK_SEL_24MHZ); /* PLL 24Mhz */
- writel((readl(&phy->rstcon) &~(LINK_SW_RST | PHYLNK_SW_RST))
- | PHY_SW_RST0, &phy->rstcon);
+ clrsetbits_le32(&phy->rstcon, LINK_SW_RST | PHYLNK_SW_RST, PHY_SW_RST0);
udelay(10);
- writel(readl(&phy->rstcon)
- &~(PHY_SW_RST0 | LINK_SW_RST | PHYLNK_SW_RST), &phy->rstcon);
+ clrbits_le32(&phy->rstcon, PHY_SW_RST0 | LINK_SW_RST | PHYLNK_SW_RST);
udelay(10);
}
@@ -86,13 +81,11 @@ void otg_phy_off(struct dwc2_udc *dev)
writel(readl(&phy->phypwr) &~PHY_SW_RST0, &phy->rstcon);
udelay(20);
- writel(readl(&phy->phypwr) | OTG_DISABLE_0 | ANALOG_PWRDOWN
- | FORCE_SUSPEND_0, &phy->phypwr);
+ setbits_le32(&phy->phypwr, OTG_DISABLE_0 | ANALOG_PWRDOWN | FORCE_SUSPEND_0);
- writel(readl(usb_phy_ctrl) &~USB_PHY_CTRL_EN0, usb_phy_ctrl);
+ clrbits_le32(usb_phy_ctrl, USB_PHY_CTRL_EN0);
- writel((readl(&phy->phyclk) & ~(ID_PULLUP0 | COMMON_ON_N0)),
- &phy->phyclk);
+ clrbits_le32(&phy->phyclk, ID_PULLUP0 | COMMON_ON_N0);
udelay(10000);
diff --git a/drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c b/drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c
index 2be93592c423df7a9acea473b0e84e1f948999be..fca052b4556a7d2ae4fe516e39820611d7082e2f 100644
--- a/drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c
+++ b/drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c
@@ -31,15 +31,11 @@ int clear_feature_flag;
static inline void dwc2_udc_ep0_zlp(struct dwc2_udc *dev)
{
- u32 ep_ctrl;
-
writel(phys_to_bus((unsigned long)usb_ctrl_dma_addr),
®->device_regs.in_endp[EP0_CON].diepdma);
writel(FIELD_PREP(DXEPTSIZ_PKTCNT_MASK, 1), ®->device_regs.in_endp[EP0_CON].dieptsiz);
- ep_ctrl = readl(®->device_regs.in_endp[EP0_CON].diepctl);
- writel(ep_ctrl | DXEPCTL_EPENA | DXEPCTL_CNAK,
- ®->device_regs.in_endp[EP0_CON].diepctl);
+ setbits_le32(®->device_regs.in_endp[EP0_CON].diepctl, DXEPCTL_EPENA | DXEPCTL_CNAK);
debug_cond(DEBUG_EP0 != 0, "%s:EP0 ZLP DIEPCTL0 = 0x%x\n",
__func__, readl(®->device_regs.in_endp[EP0_CON].diepctl));
@@ -48,8 +44,6 @@ static inline void dwc2_udc_ep0_zlp(struct dwc2_udc *dev)
static void dwc2_udc_pre_setup(void)
{
- u32 ep_ctrl;
-
debug_cond(DEBUG_IN_EP,
"%s : Prepare Setup packets.\n", __func__);
@@ -58,20 +52,16 @@ static void dwc2_udc_pre_setup(void)
writel(phys_to_bus((unsigned long)usb_ctrl_dma_addr),
®->device_regs.out_endp[EP0_CON].doepdma);
- ep_ctrl = readl(®->device_regs.out_endp[EP0_CON].doepctl);
- writel(ep_ctrl | DXEPCTL_EPENA, ®->device_regs.out_endp[EP0_CON].doepctl);
+ setbits_le32(®->device_regs.out_endp[EP0_CON].doepctl, DXEPCTL_EPENA);
debug_cond(DEBUG_EP0 != 0, "%s:EP0 ZLP DIEPCTL0 = 0x%x\n",
__func__, readl(®->device_regs.in_endp[EP0_CON].diepctl));
debug_cond(DEBUG_EP0 != 0, "%s:EP0 ZLP DOEPCTL0 = 0x%x\n",
__func__, readl(®->device_regs.out_endp[EP0_CON].doepctl));
-
}
static inline void dwc2_ep0_complete_out(void)
{
- u32 ep_ctrl;
-
debug_cond(DEBUG_EP0 != 0, "%s:EP0 ZLP DIEPCTL0 = 0x%x\n",
__func__, readl(®->device_regs.in_endp[EP0_CON].diepctl));
debug_cond(DEBUG_EP0 != 0, "%s:EP0 ZLP DOEPCTL0 = 0x%x\n",
@@ -85,15 +75,12 @@ static inline void dwc2_ep0_complete_out(void)
writel(phys_to_bus((unsigned long)usb_ctrl_dma_addr),
®->device_regs.out_endp[EP0_CON].doepdma);
- ep_ctrl = readl(®->device_regs.out_endp[EP0_CON].doepctl);
- writel(ep_ctrl | DXEPCTL_EPENA | DXEPCTL_CNAK,
- ®->device_regs.out_endp[EP0_CON].doepctl);
+ setbits_le32(®->device_regs.out_endp[EP0_CON].doepctl, DXEPCTL_EPENA | DXEPCTL_CNAK);
debug_cond(DEBUG_EP0 != 0, "%s:EP0 ZLP DIEPCTL0 = 0x%x\n",
__func__, readl(®->device_regs.in_endp[EP0_CON].diepctl));
debug_cond(DEBUG_EP0 != 0, "%s:EP0 ZLP DOEPCTL0 = 0x%x\n",
__func__, readl(®->device_regs.out_endp[EP0_CON].doepctl));
-
}
static int setdma_rx(struct dwc2_ep *ep, struct dwc2_request *req)
@@ -136,12 +123,11 @@ static int setdma_rx(struct dwc2_ep *ep, struct dwc2_request *req)
readl(®->device_regs.out_endp[ep_num].doepctl),
buf, pktcnt, length);
return 0;
-
}
static int setdma_tx(struct dwc2_ep *ep, struct dwc2_request *req)
{
- u32 *buf, ctrl = 0;
+ u32 *buf;
u32 length, pktcnt;
u32 ep_num = ep_index(ep);
@@ -171,16 +157,10 @@ static int setdma_tx(struct dwc2_ep *ep, struct dwc2_request *req)
FIELD_PREP(DXEPTSIZ_XFERSIZE_MASK, length),
®->device_regs.in_endp[ep_num].dieptsiz);
- ctrl = readl(®->device_regs.in_endp[ep_num].diepctl);
-
- /* Write the FIFO number to be used for this endpoint */
- ctrl &= ~DXEPCTL_TXFNUM_MASK;
- ctrl |= FIELD_PREP(DXEPCTL_TXFNUM_MASK, ep->fifo_num);
-
- /* Clear reserved (Next EP) bits */
- ctrl &= ~DXEPCTL_NEXTEP_MASK;
-
- writel(DXEPCTL_EPENA | DXEPCTL_CNAK | ctrl, ®->device_regs.in_endp[ep_num].diepctl);
+ clrsetbits_le32(®->device_regs.in_endp[ep_num].diepctl,
+ DXEPCTL_TXFNUM_MASK | DXEPCTL_NEXTEP_MASK,
+ FIELD_PREP(DXEPCTL_TXFNUM_MASK, ep->fifo_num) |
+ DXEPCTL_EPENA | DXEPCTL_CNAK);
debug_cond(DEBUG_IN_EP,
"%s:EP%d TX DMA start : DIEPDMA0 = 0x%x,"
@@ -766,9 +746,7 @@ static int dwc2_fifo_read(struct dwc2_ep *ep, void *cp, int max)
*/
static void udc_set_address(struct dwc2_udc *dev, unsigned char address)
{
- u32 ctrl = readl(®->device_regs.dcfg);
-
- writel(FIELD_PREP(DCFG_DEVADDR_MASK, address) | ctrl, ®->device_regs.dcfg);
+ setbits_le32(®->device_regs.dcfg, FIELD_PREP(DCFG_DEVADDR_MASK, address));
dwc2_udc_ep0_zlp(dev);
@@ -892,7 +870,6 @@ static int dwc2_udc_get_status(struct dwc2_udc *dev,
{
u8 ep_num = crq->wIndex & 0x3;
u16 g_status = 0;
- u32 ep_ctrl;
debug_cond(DEBUG_SETUP != 0,
"%s: *** USB_REQ_GET_STATUS\n", __func__);
@@ -940,9 +917,7 @@ static int dwc2_udc_get_status(struct dwc2_udc *dev,
writel(FIELD_PREP(DXEPTSIZ_PKTCNT_MASK, 1) | FIELD_PREP(DXEPTSIZ_XFERSIZE_MASK, 2),
®->device_regs.in_endp[EP0_CON].dieptsiz);
- ep_ctrl = readl(®->device_regs.in_endp[EP0_CON].diepctl);
- writel(ep_ctrl | DXEPCTL_EPENA | DXEPCTL_CNAK,
- ®->device_regs.in_endp[EP0_CON].diepctl);
+ setbits_le32(®->device_regs.in_endp[EP0_CON].diepctl, DXEPCTL_EPENA | DXEPCTL_CNAK);
dev->ep0state = WAIT_FOR_NULL_COMPLETE;
return 0;
@@ -951,21 +926,16 @@ static int dwc2_udc_get_status(struct dwc2_udc *dev,
static void dwc2_udc_set_nak(struct dwc2_ep *ep)
{
u8 ep_num;
- u32 ep_ctrl = 0;
ep_num = ep_index(ep);
debug("%s: ep_num = %d, ep_type = %d\n", __func__, ep_num, ep->ep_type);
if (ep_is_in(ep)) {
- ep_ctrl = readl(®->device_regs.in_endp[ep_num].diepctl);
- ep_ctrl |= DXEPCTL_SNAK;
- writel(ep_ctrl, ®->device_regs.in_endp[ep_num].diepctl);
+ setbits_le32(®->device_regs.in_endp[ep_num].diepctl, DXEPCTL_SNAK);
debug("%s: set NAK, DIEPCTL%d = 0x%x\n",
__func__, ep_num, readl(®->device_regs.in_endp[ep_num].diepctl));
} else {
- ep_ctrl = readl(®->device_regs.out_endp[ep_num].doepctl);
- ep_ctrl |= DXEPCTL_SNAK;
- writel(ep_ctrl, ®->device_regs.out_endp[ep_num].doepctl);
+ setbits_le32(®->device_regs.out_endp[ep_num].doepctl, DXEPCTL_SNAK);
debug("%s: set NAK, DOEPCTL%d = 0x%x\n",
__func__, ep_num, readl(®->device_regs.out_endp[ep_num].doepctl));
}
@@ -995,12 +965,8 @@ static void dwc2_udc_ep_set_stall(struct dwc2_ep *ep)
__func__, ep_num, readl(®->device_regs.in_endp[ep_num].diepctl));
} else {
- ep_ctrl = readl(®->device_regs.out_endp[ep_num].doepctl);
-
/* set the stall bit */
- ep_ctrl |= DXEPCTL_STALL;
-
- writel(ep_ctrl, ®->device_regs.out_endp[ep_num].doepctl);
+ setbits_le32(®->device_regs.out_endp[ep_num].doepctl, DXEPCTL_STALL);
debug("%s: set stall, DOEPCTL%d = 0x%x\n",
__func__, ep_num, readl(®->device_regs.out_endp[ep_num].doepctl));
}
@@ -1145,9 +1111,8 @@ static void dwc2_udc_ep_activate(struct dwc2_ep *ep)
}
/* Unmask EP Interrtupt */
- writel(readl(®->device_regs.daintmsk) | daintmsk, ®->device_regs.daintmsk);
+ setbits_le32(®->device_regs.daintmsk, daintmsk);
debug("%s: DAINTMSK = 0x%x\n", __func__, readl(®->device_regs.daintmsk));
-
}
static int dwc2_udc_clear_feature(struct usb_ep *_ep)
---
base-commit: 05051cfdf0ed6258a945ec181e36d14b7e450dbf
change-id: 20250125-dwc2-clrsetbits-refactor-e485db93d296
prerequisite-message-id: <20250110-dwc2-dev-v4-0-987f4fd6f8b2 at pigmoral.tech>
prerequisite-patch-id: f05fe7f02791b8f5f6e89e3768584622c49e2ed7
prerequisite-patch-id: ba89fc49fb08beb94bc5c69c4b82e198a27c334d
prerequisite-patch-id: bc3632796d0010d5711be9597c4222c23adbf9f7
prerequisite-patch-id: b30e9c649999f42bc5c659bde5650e8aa2a33acd
prerequisite-patch-id: d6623dbacae347c4c7e339a294c60402667a359b
prerequisite-patch-id: 64e64d31939ea7f69818883fbafb8c1906b53ecb
prerequisite-patch-id: 9de6c80cd2996924b8f94a33f3e2a3dd63f1f57b
prerequisite-patch-id: e1752a8f249752de133bda41a387b3d147d60453
Best regards,
--
Junhui Liu <junhui.liu at pigmoral.tech>
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