Hi Nicolas,
On Tue, 15 Dec 2020 at 10:23, Nicolas Saenz Julienne nsaenzjulienne@suse.de wrote:
So far we've been content with passing physical addresses when configuring memory addresses into XHCI controllers, but not all platforms have buses with transparent mappings. Specifically the Raspberry Pi 4 might introduce an offset to memory accesses incoming from its PCIe port.
Introduce xhci_virt_to_bus() and xhci_bus_to_virt() to cater with these limitations, and make sure we don't break non DM users.
Signed-off-by: Nicolas Saenz Julienne nsaenzjulienne@suse.de
drivers/usb/host/xhci-mem.c | 45 +++++++++++++++++++----------------- drivers/usb/host/xhci-ring.c | 11 +++++---- drivers/usb/host/xhci.c | 4 ++-- include/usb/xhci.h | 22 +++++++++++++++++- 4 files changed, 54 insertions(+), 28 deletions(-)
Reviewed-by: Simon Glass sjg@chromium.org
nits below
[..]
diff --git a/include/usb/xhci.h b/include/usb/xhci.h index e1d382369a..b87210b9ba 100644 --- a/include/usb/xhci.h +++ b/include/usb/xhci.h @@ -16,6 +16,7 @@ #ifndef HOST_XHCI_H_ #define HOST_XHCI_H_
+#include <phys2bus.h> #include <reset.h> #include <asm/types.h> #include <asm/cache.h> @@ -1250,7 +1251,8 @@ int xhci_check_maxpacket(struct usb_device *udev); void xhci_flush_cache(uintptr_t addr, u32 type_len); void xhci_inval_cache(uintptr_t addr, u32 type_len); void xhci_cleanup(struct xhci_ctrl *ctrl); -struct xhci_ring *xhci_ring_alloc(unsigned int num_segs, bool link_trbs); +struct xhci_ring *xhci_ring_alloc(struct xhci_ctrl *ctrl, unsigned int num_segs,
bool link_trbs);
Can you please add a comment while you are here?
int xhci_alloc_virt_device(struct xhci_ctrl *ctrl, unsigned int slot_id); int xhci_mem_init(struct xhci_ctrl *ctrl, struct xhci_hccr *hccr, struct xhci_hcor *hcor); @@ -1278,4 +1280,22 @@ extern struct dm_usb_ops xhci_usb_ops;
struct xhci_ctrl *xhci_get_ctrl(struct usb_device *udev);
+static inline dma_addr_t xhci_virt_to_bus(struct xhci_ctrl *ctrl, void *addr) +{ +#if CONFIG_IS_ENABLED(DM_DMA)
Can this use if() ?
return dev_phys_to_bus(ctrl->dev, virt_to_phys(addr));+#else
return phys_to_bus(virt_to_phys(addr));+#endif +}
+static inline void *xhci_bus_to_virt(struct xhci_ctrl *ctrl, dma_addr_t addr) +{ +#if CONFIG_IS_ENABLED(DM_DMA)
return phys_to_virt(dev_bus_to_phys(ctrl->dev, addr));+#else
return phys_to_virt(bus_to_phys(addr));+#endif +}
#endif /* HOST_XHCI_H_ */
2.29.2
Regards, Simon