usb: musb: Add musb_clearb/w() interface

Delete the const attribute of addr parameter in readb/w/l hooks, these
changes are for implementing clearing W1C registers.
Replace musb_readb/w with musb_clearb/w to clear the interrupt status.

While at here, change some unsigned type to u32 to fix checkpatch.pl
warnings.

Signed-off-by: Min Guo <[e-mail]>
[[e-mail]: fix checkpatch.pl warnings.]
Signed-off-by: Bin Liu <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/musb/musb_core.c

···
 	return 0x80 + (0x08 * epnum) + offset;
 }
 
-static u8 musb_default_readb(const void __iomem *addr, unsigned offset)
+static u8 musb_default_readb(void __iomem *addr, u32 offset)
 {
 	u8 data =  __raw_readb(addr + offset);
 
···
 	return data;
 }
 
-static void musb_default_writeb(void __iomem *addr, unsigned offset, u8 data)
+static void musb_default_writeb(void __iomem *addr, u32 offset, u8 data)
 {
 	trace_musb_writeb(__builtin_return_address(0), addr, offset, data);
 	__raw_writeb(data, addr + offset);
 }
 
-static u16 musb_default_readw(const void __iomem *addr, unsigned offset)
+static u16 musb_default_readw(void __iomem *addr, u32 offset)
 {
 	u16 data = __raw_readw(addr + offset);
 
···
 	return data;
 }
 
-static void musb_default_writew(void __iomem *addr, unsigned offset, u16 data)
+static void musb_default_writew(void __iomem *addr, u32 offset, u16 data)
 {
 	trace_musb_writew(__builtin_return_address(0), addr, offset, data);
 	__raw_writew(data, addr + offset);
···
 /*
  * Old style IO functions
  */
-u8 (*musb_readb)(const void __iomem *addr, unsigned offset);
+u8 (*musb_readb)(void __iomem *addr, u32 offset);
 EXPORT_SYMBOL_GPL(musb_readb);
 
-void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
+void (*musb_writeb)(void __iomem *addr, u32 offset, u8 data);
 EXPORT_SYMBOL_GPL(musb_writeb);
 
-u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
+u8 (*musb_clearb)(void __iomem *addr, u32 offset);
+EXPORT_SYMBOL_GPL(musb_clearb);
+
+u16 (*musb_readw)(void __iomem *addr, u32 offset);
 EXPORT_SYMBOL_GPL(musb_readw);
 
-void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
+void (*musb_writew)(void __iomem *addr, u32 offset, u16 data);
 EXPORT_SYMBOL_GPL(musb_writew);
 
-u32 musb_readl(const void __iomem *addr, unsigned offset)
+u16 (*musb_clearw)(void __iomem *addr, u32 offset);
+EXPORT_SYMBOL_GPL(musb_clearw);
+
+u32 musb_readl(void __iomem *addr, u32 offset)
 {
 	u32 data = __raw_readl(addr + offset);
 
···
 }
 EXPORT_SYMBOL_GPL(musb_readl);
 
-void musb_writel(void __iomem *addr, unsigned offset, u32 data)
+void musb_writel(void __iomem *addr, u32 offset, u32 data)
 {
 	trace_musb_writel(__builtin_return_address(0), addr, offset, data);
 	__raw_writel(data, addr + offset);
···
 static void musb_disable_interrupts(struct musb *musb)
 {
 	void __iomem	*mbase = musb->mregs;
-	u16	temp;
 
 	/* disable interrupts */
 	musb_writeb(mbase, MUSB_INTRUSBE, 0);
···
 	musb_writew(mbase, MUSB_INTRRXE, 0);
 
 	/*  flush pending interrupts */
-	temp = musb_readb(mbase, MUSB_INTRUSB);
-	temp = musb_readw(mbase, MUSB_INTRTX);
-	temp = musb_readw(mbase, MUSB_INTRRX);
+	musb_clearb(mbase, MUSB_INTRUSB);
+	musb_clearw(mbase, MUSB_INTRTX);
+	musb_clearw(mbase, MUSB_INTRRX);
 }
 
 static void musb_enable_interrupts(struct musb *musb)
···
 		musb_readb = musb->ops->readb;
 	if (musb->ops->writeb)
 		musb_writeb = musb->ops->writeb;
+	if (musb->ops->clearb)
+		musb_clearb = musb->ops->clearb;
+	else
+		musb_clearb = musb_readb;
+
 	if (musb->ops->readw)
 		musb_readw = musb->ops->readw;
 	if (musb->ops->writew)
 		musb_writew = musb->ops->writew;
+	if (musb->ops->clearw)
+		musb_clearw = musb->ops->clearw;
+	else
+		musb_clearw = musb_readw;
 
 #ifndef CONFIG_MUSB_PIO_ONLY
 	if (!musb->ops->dma_init || !musb->ops->dma_exit) {

drivers/usb/musb/musb_core.h

···
  * @fifo_offset: returns the fifo offset
  * @readb:	read 8 bits
  * @writeb:	write 8 bits
+ * @clearb:	could be clear-on-readb or W1C
  * @readw:	read 16 bits
  * @writew:	write 16 bits
+ * @clearw:	could be clear-on-readw or W1C
  * @read_fifo:	reads the fifo
  * @write_fifo:	writes to fifo
  * @get_toggle:	platform specific get toggle function
···
 	u16	fifo_mode;
 	u32	(*fifo_offset)(u8 epnum);
 	u32	(*busctl_offset)(u8 epnum, u16 offset);
-	u8	(*readb)(const void __iomem *addr, unsigned offset);
-	void	(*writeb)(void __iomem *addr, unsigned offset, u8 data);
-	u16	(*readw)(const void __iomem *addr, unsigned offset);
-	void	(*writew)(void __iomem *addr, unsigned offset, u16 data);
+	u8	(*readb)(void __iomem *addr, u32 offset);
+	void	(*writeb)(void __iomem *addr, u32 offset, u8 data);
+	u8	(*clearb)(void __iomem *addr, u32 offset);
+	u16	(*readw)(void __iomem *addr, u32 offset);
+	void	(*writew)(void __iomem *addr, u32 offset, u16 data);
+	u16	(*clearw)(void __iomem *addr, u32 offset);
 	void	(*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
 	void	(*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
 	u16	(*get_toggle)(struct musb_qh *qh, int is_out);

drivers/usb/musb/musb_io.h

···
 };
 
 /* Do not add new entries here, add them the struct musb_io instead */
-extern u8 (*musb_readb)(const void __iomem *addr, unsigned offset);
-extern void (*musb_writeb)(void __iomem *addr, unsigned offset, u8 data);
-extern u16 (*musb_readw)(const void __iomem *addr, unsigned offset);
-extern void (*musb_writew)(void __iomem *addr, unsigned offset, u16 data);
-extern u32 musb_readl(const void __iomem *addr, unsigned offset);
-extern void musb_writel(void __iomem *addr, unsigned offset, u32 data);
+extern u8 (*musb_readb)(void __iomem *addr, u32 offset);
+extern void (*musb_writeb)(void __iomem *addr, u32 offset, u8 data);
+extern u8 (*musb_clearb)(void __iomem *addr, u32 offset);
+extern u16 (*musb_readw)(void __iomem *addr, u32 offset);
+extern void (*musb_writew)(void __iomem *addr, u32 offset, u16 data);
+extern u16 (*musb_clearw)(void __iomem *addr, u32 offset);
+extern u32 musb_readl(void __iomem *addr, u32 offset);
+extern void musb_writel(void __iomem *addr, u32 offset, u32 data);
 
 #endif

drivers/usb/musb/musbhsdma.c

···
 
 	spin_lock_irqsave(&musb->lock, flags);
 
-	int_hsdma = musb_readb(mbase, MUSB_HSDMA_INTR);
+	int_hsdma = musb_clearb(mbase, MUSB_HSDMA_INTR);
 
 	if (!int_hsdma) {
 		musb_dbg(musb, "spurious DMA irq");

drivers/usb/musb/sunxi.c

···
 	return SUNXI_MUSB_TXFUNCADDR + offset;
 }
 
-static u8 sunxi_musb_readb(const void __iomem *addr, unsigned offset)
+static u8 sunxi_musb_readb(void __iomem *addr, u32 offset)
 {
 	struct sunxi_glue *glue;
 
···
 		(int)(addr - sunxi_musb->mregs));
 }
 
-static u16 sunxi_musb_readw(const void __iomem *addr, unsigned offset)
+static u16 sunxi_musb_readw(void __iomem *addr, u32 offset)
 {
 	if (addr == sunxi_musb->mregs) {
 		/* generic control or fifo control reg access */

drivers/usb/musb/tusb6010.c

···
 /*
  * TUSB6010 doesn't allow 8-bit access; 16-bit access is the minimum.
  */
-static u8 tusb_readb(const void __iomem *addr, unsigned offset)
+static u8 tusb_readb(void __iomem *addr, u32 offset)
 {
 	u16 tmp;
 	u8 val;