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USB: Add dcache support to the EHCI driver

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This patch adds routines to handle (flush/invalidate) the dcache for the
QH and qTD structures and data buffers. This is needed on platforms using
this EHCI support with dcache enabled (like the MIPS VCT board port).

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Remy Bohmer <linux@bohmer.net>
This commit is contained in:
Stefan Roese 2009-01-21 17:12:19 +01:00 committed by Remy Bohmer
parent 4e0ea0efc1
commit daa2dafb45
2 changed files with 103 additions and 0 deletions
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5
drivers/usb/usb_ehci.h
View File

@ -180,6 +180,11 @@ struct QH {
uint32_t qh_endpt2;
uint32_t qh_curtd;
struct qTD qh_overlay;
/*
* Add dummy fill value to make the size of this struct
* aligned to 32 bytes
*/
uint8_t fill[16];
};
/* Low level init functions */

98
drivers/usb/usb_ehci_core.c
View File

@ -106,6 +106,99 @@ static struct descriptor {
#define ehci_is_TDI() (0)
#endif
#if defined(CONFIG_EHCI_DCACHE)
/*
* Routines to handle (flush/invalidate) the dcache for the QH and qTD
* structures and data buffers. This is needed on platforms using this
* EHCI support with dcache enabled.
*/
static void flush_invalidate(u32 addr, int size, int flush)
{
if (flush)
flush_dcache_range(addr, addr + size);
else
invalidate_dcache_range(addr, addr + size);
}
static void cache_qtd(struct qTD *qtd, int flush)
{
u32 *ptr = (u32 *)qtd->qt_buffer[0];
int len = (qtd->qt_token & 0x7fff0000) >> 16;
flush_invalidate((u32)qtd, sizeof(struct qTD), flush);
if (ptr && len)
flush_invalidate((u32)ptr, len, flush);
}
static inline struct QH *qh_addr(struct QH *qh)
{
return (struct QH *)((u32)qh & 0xffffffe0);
}
static void cache_qh(struct QH *qh, int flush)
{
struct qTD *qtd;
struct qTD *next;
static struct qTD *first_qtd;
/*
* Walk the QH list and flush/invalidate all entries
*/
while (1) {
flush_invalidate((u32)qh_addr(qh), sizeof(struct QH), flush);
if ((u32)qh & QH_LINK_TYPE_QH)
break;
qh = qh_addr(qh);
qh = (struct QH *)qh->qh_link;
}
qh = qh_addr(qh);
/*
* Save first qTD pointer, needed for invalidating pass on this QH
*/
if (flush)
first_qtd = qtd = (struct qTD *)(*(u32 *)&qh->qh_overlay &
0xffffffe0);
else
qtd = first_qtd;
/*
* Walk the qTD list and flush/invalidate all entries
*/
while (1) {
if (qtd == NULL)
break;
cache_qtd(qtd, flush);
next = (struct qTD *)((u32)qtd->qt_next & 0xffffffe0);
if (next == qtd)
break;
qtd = next;
}
}
static inline void ehci_flush_dcache(struct QH *qh)
{
cache_qh(qh, 1);
}
static inline void ehci_invalidate_dcache(struct QH *qh)
{
cache_qh(qh, 0);
}
#else /* CONFIG_EHCI_DCACHE */
/*
*
*/
static inline void ehci_flush_dcache(struct QH *qh)
{
}
static inline void ehci_invalidate_dcache(struct QH *qh)
{
}
#endif /* CONFIG_EHCI_DCACHE */
static int handshake(uint32_t *ptr, uint32_t mask, uint32_t done, int usec)
{
uint32_t result;
@ -331,6 +424,9 @@ ehci_submit_async(struct usb_device *dev, unsigned long pipe, void *buffer,
qh_list.qh_link = cpu_to_hc32((uint32_t) qh | QH_LINK_TYPE_QH);
/* Flush dcache */
ehci_flush_dcache(&qh_list);
usbsts = ehci_readl(&hcor->or_usbsts);
ehci_writel(&hcor->or_usbsts, (usbsts & 0x3f));
@ -350,6 +446,8 @@ ehci_submit_async(struct usb_device *dev, unsigned long pipe, void *buffer,
ts = get_timer(0);
vtd = td;
do {
/* Invalidate dcache */
ehci_invalidate_dcache(&qh_list);
token = hc32_to_cpu(vtd->qt_token);
if (!(token & 0x80))
break;