USB: xhci: BIOS handoff and HW initialization.

Add PCI initialization code to take control of the xHCI host controller
away from the BIOS, halt, and reset the host controller.  The xHCI spec
says that BIOSes must give up the host controller within 5 seconds.

Add some host controller glue functions to handle hardware initialization
and memory allocation for the host controller.  The current xHCI
prototypes use PCI interrupts, but the xHCI spec requires MSI-X
interrupts.  Add code to support MSI-X interrupts, but use the PCI
interrupts for now.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 61 insertions, 2 deletions

diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index a4d44aad0697..59fae2e5ea59 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -32,6 +32,9 @@
 /* xHCI PCI Configuration Registers */
 #define XHCI_SBRN_OFFSET        (0x60)
 
+/* Max number of USB devices for any host controller - limit in section 6.1 */
+#define MAX_HC_SLOTS            256
+
 /*
  * xHCI register interface.
  * This corresponds to the eXtensible Host Controller Interface (xHCI)
@@ -359,10 +362,35 @@ struct intr_reg {
         u32     erst_dequeue[2];
 } __attribute__ ((packed));
 
+/* irq_pending bitmasks */
 #define ER_IRQ_PENDING(p)       ((p) & 0x1)
-#define ER_IRQ_ENABLE(p)        ((p) | 0x2)
+/* bits 2:31 need to be preserved */
+#define ER_IRQ_CLEAR(p)         ((p) & 0xfffffffe)
+#define ER_IRQ_ENABLE(p)        ((ER_IRQ_CLEAR(p)) | 0x2)
+#define ER_IRQ_DISABLE(p)       ((ER_IRQ_CLEAR(p)) & ~(0x2))
+
+/* irq_control bitmasks */
+/* Minimum interval between interrupts (in 250ns intervals).  The interval
+ * between interrupts will be longer if there are no events on the event ring.
+ * Default is 4000 (1 ms).
+ */
+#define ER_IRQ_INTERVAL_MASK    (0xffff)
+/* Counter used to count down the time to the next interrupt - HW use only */
+#define ER_IRQ_COUNTER_MASK     (0xffff << 16)
+
+/* erst_size bitmasks */
 /* Preserve bits 16:31 of erst_size */
-#define ERST_SIZE_MASK  (0xffff<<16)
+#define ERST_SIZE_MASK          (0xffff << 16)
+
+/* erst_dequeue bitmasks */
+/* Dequeue ERST Segment Index (DESI) - Segment number (or alias)
+ * where the current dequeue pointer lies.  This is an optional HW hint.
+ */
+#define ERST_DESI_MASK          (0x7)
+/* Event Handler Busy (EHB) - is the event ring scheduled to be serviced by
+ * a work queue (or delayed service routine)?
+ */
+#define ERST_EHB                (1 << 3)
 
 /**
  * struct xhci_run_regs
@@ -386,6 +414,8 @@ struct xhci_hcd {
         struct xhci_cap_regs __iomem *cap_regs;
         struct xhci_op_regs __iomem *op_regs;
         struct xhci_run_regs __iomem *run_regs;
+        /* Our HCD's current interrupter register set */
+        struct  intr_reg __iomem *ir_set;
 
         /* Cached register copies of read-only HC data */
         __u32           hcs_params1;
@@ -404,7 +434,13 @@ struct xhci_hcd {
         u8              isoc_threshold;
         int             event_ring_max;
         int             addr_64;
+        /* 4KB min, 128MB max */
         int             page_size;
+        /* Valid values are 12 to 20, inclusive */
+        int             page_shift;
+        /* only one MSI vector for now, but might need more later */
+        int             msix_count;
+        struct msix_entry       *msix_entries;
 };
 
 /* convert between an HCD pointer and the corresponding EHCI_HCD */
@@ -449,4 +485,27 @@ static inline void xhci_writel(const struct xhci_hcd *xhci,
         writel(val, regs);
 }
 
+/* xHCI debugging */
+void xhci_print_ir_set(struct xhci_hcd *xhci, struct intr_reg *ir_set, int set_num);
+void xhci_print_registers(struct xhci_hcd *xhci);
+
+/* xHCI memory managment */
+void xhci_mem_cleanup(struct xhci_hcd *xhci);
+int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags);
+
+#ifdef CONFIG_PCI
+/* xHCI PCI glue */
+int xhci_register_pci(void);
+void xhci_unregister_pci(void);
+#endif
+
+/* xHCI host controller glue */
+int xhci_halt(struct xhci_hcd *xhci);
+int xhci_reset(struct xhci_hcd *xhci);
+int xhci_init(struct usb_hcd *hcd);
+int xhci_run(struct usb_hcd *hcd);
+void xhci_stop(struct usb_hcd *hcd);
+void xhci_shutdown(struct usb_hcd *hcd);
+int xhci_get_frame(struct usb_hcd *hcd);
+
 #endif /* __LINUX_XHCI_HCD_H */