Revert "xhci: replace xhci_read_64() with readq()"

This reverts commit e8b373326d8efcaf9ec1da8b618556c89bd5ffc4.  Many xHCI
host controllers can only handle 32-bit addresses, and writing 64-bits
at a time causes them to fail.  Reading 64-bits at a time may also cause
them to return 0xffffffff, so revert this commit as well.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

diff --git a/drivers/usb/host/xhci-dbg.c b/drivers/usb/host/xhci-dbg.c
index b016d38..eb009a4 100644 (file)
--- a/drivers/usb/host/xhci-dbg.c
+++ b/drivers/usb/host/xhci-dbg.c
@@ -203,12 +203,12 @@ void xhci_print_ir_set(struct xhci_hcd *xhci, int set_num)
                                addr, (unsigned int)temp);
 
        addr = &ir_set->erst_base;
-       temp_64 = readq(addr);
+       temp_64 = xhci_read_64(xhci, addr);
        xhci_dbg(xhci, "  %p: ir_set.erst_base = @%08llx\n",
                        addr, temp_64);
 
        addr = &ir_set->erst_dequeue;
-       temp_64 = readq(addr);
+       temp_64 = xhci_read_64(xhci, addr);
        xhci_dbg(xhci, "  %p: ir_set.erst_dequeue = @%08llx\n",
                        addr, temp_64);
 }
@@ -412,7 +412,7 @@ void xhci_dbg_cmd_ptrs(struct xhci_hcd *xhci)
 {
        u64 val;
 
-       val = readq(&xhci->op_regs->cmd_ring);
+       val = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
        xhci_dbg(xhci, "// xHC command ring deq ptr low bits + flags = @%08x\n",
                        lower_32_bits(val));
        xhci_dbg(xhci, "// xHC command ring deq ptr high bits = @%08x\n",

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 4b87026..bce4391 100644 (file)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1958,7 +1958,7 @@ static void xhci_set_hc_event_deq(struct xhci_hcd *xhci)
                xhci_warn(xhci, "WARN something wrong with SW event ring "
                                "dequeue ptr.\n");
        /* Update HC event ring dequeue pointer */
-       temp = readq(&xhci->ir_set->erst_dequeue);
+       temp = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
        temp &= ERST_PTR_MASK;
        /* Don't clear the EHB bit (which is RW1C) because
         * there might be more events to service.
@@ -2312,7 +2312,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
                        (unsigned long long)xhci->cmd_ring->first_seg->dma);
 
        /* Set the address in the Command Ring Control register */
-       val_64 = readq(&xhci->op_regs->cmd_ring);
+       val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
        val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) |
                (xhci->cmd_ring->first_seg->dma & (u64) ~CMD_RING_RSVD_BITS) |
                xhci->cmd_ring->cycle_state;
@@ -2396,7 +2396,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
        xhci_dbg_trace(xhci, trace_xhci_dbg_init,
                        "// Set ERST base address for ir_set 0 = 0x%llx",
                        (unsigned long long)xhci->erst.erst_dma_addr);
-       val_64 = readq(&xhci->ir_set->erst_base);
+       val_64 = xhci_read_64(xhci, &xhci->ir_set->erst_base);
        val_64 &= ERST_PTR_MASK;
        val_64 |= (xhci->erst.erst_dma_addr & (u64) ~ERST_PTR_MASK);
        xhci_write_64(xhci, val_64, &xhci->ir_set->erst_base);

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index e19fae9..909b32a 100644 (file)
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -307,7 +307,7 @@ static int xhci_abort_cmd_ring(struct xhci_hcd *xhci)
                return 0;
        }
 
-       temp_64 = readq(&xhci->op_regs->cmd_ring);
+       temp_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
        if (!(temp_64 & CMD_RING_RUNNING)) {
                xhci_dbg(xhci, "Command ring had been stopped\n");
                return 0;
@@ -2865,7 +2865,7 @@ hw_died:
                /* Clear the event handler busy flag (RW1C);
                 * the event ring should be empty.
                 */
-               temp_64 = readq(&xhci->ir_set->erst_dequeue);
+               temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
                xhci_write_64(xhci, temp_64 | ERST_EHB,
                                &xhci->ir_set->erst_dequeue);
                spin_unlock(&xhci->lock);
@@ -2879,7 +2879,7 @@ hw_died:
         */
        while (xhci_handle_event(xhci) > 0) {}
 
-       temp_64 = readq(&xhci->ir_set->erst_dequeue);
+       temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
        /* If necessary, update the HW's version of the event ring deq ptr. */
        if (event_ring_deq != xhci->event_ring->dequeue) {
                deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index ebbe52c..3712359 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -611,7 +611,7 @@ int xhci_run(struct usb_hcd *hcd)
        xhci_dbg(xhci, "Event ring:\n");
        xhci_debug_ring(xhci, xhci->event_ring);
        xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
-       temp_64 = readq(&xhci->ir_set->erst_dequeue);
+       temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
        temp_64 &= ~ERST_PTR_MASK;
        xhci_dbg_trace(xhci, trace_xhci_dbg_init,
                        "ERST deq = 64'h%0lx", (long unsigned int) temp_64);
@@ -756,11 +756,11 @@ static void xhci_save_registers(struct xhci_hcd *xhci)
 {
        xhci->s3.command = readl(&xhci->op_regs->command);
        xhci->s3.dev_nt = readl(&xhci->op_regs->dev_notification);
-       xhci->s3.dcbaa_ptr = readq(&xhci->op_regs->dcbaa_ptr);
+       xhci->s3.dcbaa_ptr = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
        xhci->s3.config_reg = readl(&xhci->op_regs->config_reg);
        xhci->s3.erst_size = readl(&xhci->ir_set->erst_size);
-       xhci->s3.erst_base = readq(&xhci->ir_set->erst_base);
-       xhci->s3.erst_dequeue = readq(&xhci->ir_set->erst_dequeue);
+       xhci->s3.erst_base = xhci_read_64(xhci, &xhci->ir_set->erst_base);
+       xhci->s3.erst_dequeue = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
        xhci->s3.irq_pending = readl(&xhci->ir_set->irq_pending);
        xhci->s3.irq_control = readl(&xhci->ir_set->irq_control);
 }
@@ -783,7 +783,7 @@ static void xhci_set_cmd_ring_deq(struct xhci_hcd *xhci)
        u64     val_64;
 
        /* step 2: initialize command ring buffer */
-       val_64 = readq(&xhci->op_regs->cmd_ring);
+       val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
        val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) |
                (xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
                                      xhci->cmd_ring->dequeue) &
@@ -3842,7 +3842,7 @@ static int xhci_setup_device(struct usb_hcd *hcd, struct usb_device *udev,
        if (ret) {
                return ret;
        }
-       temp_64 = readq(&xhci->op_regs->dcbaa_ptr);
+       temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
        xhci_dbg_trace(xhci, trace_xhci_dbg_address,
                        "Op regs DCBAA ptr = %#016llx", temp_64);
        xhci_dbg_trace(xhci, trace_xhci_dbg_address,

diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 60def15..9154fd6 100644 (file)
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -28,8 +28,6 @@
 #include <linux/kernel.h>
 #include <linux/usb/hcd.h>
 
-#include <asm-generic/io-64-nonatomic-lo-hi.h>
-
 /* Code sharing between pci-quirks and xhci hcd */
 #include       "xhci-ext-caps.h"
 #include "pci-quirks.h"
@@ -1614,6 +1612,14 @@ static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci)
  * xHCI implementations that do not support 64-bit address pointers will ignore
  * the high dword, and write order is irrelevant.
  */
+static inline u64 xhci_read_64(const struct xhci_hcd *xhci,
+               __le64 __iomem *regs)
+{
+       __u32 __iomem *ptr = (__u32 __iomem *) regs;
+       u64 val_lo = readl(ptr);
+       u64 val_hi = readl(ptr + 1);
+       return val_lo + (val_hi << 32);
+}
 static inline void xhci_write_64(struct xhci_hcd *xhci,
                                 const u64 val, __le64 __iomem *regs)
 {