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[PATCH v2 02/12] x86: fixmap: add permanent fixmap for xhci debug port

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xHCI compatible USB3 host controller may provide debug capability
which enables low-level system debug over USB. In order to probing
this debug capability, Linux kernel needs to map and access the
mmio of the host controller during early boot.

This patch adds permenent fixmap pages in fixed_addresses table for
xHCI mmio access.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 arch/x86/include/asm/fixmap.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index f80d700..fbf452f 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -82,6 +82,10 @@ enum fixed_addresses {
 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
 	FIX_OHCI1394_BASE,
 #endif
+#ifdef CONFIG_EARLY_PRINTK_XDBC
+	FIX_XDBC_BASE,
+	FIX_XDBC_END = FIX_XDBC_BASE + 15,
+#endif
 #ifdef CONFIG_X86_LOCAL_APIC
 	FIX_APIC_BASE,	/* local (CPU) APIC) -- required for SMP or not */
 #endif
-- 
2.1.4

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Thread

[PATCH v2 00/12] usb: early: add support for early printk through USB3 debug port Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-03 09:20 +0100
  [PATCH v2 02/12] x86: fixmap: add permanent fixmap for xhci debug port Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-03 09:20 +0100
  [PATCH v2 11/12] usb: serial: usb_debug: add support for dbc debug device Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-03 09:20 +0100
    Re: [PATCH v2 11/12] usb: serial: usb_debug: add support for dbc  debug device Johan Hovold <johan@kernel.org> - 2015-11-03 15:20 +0100
  [PATCH v2 06/12] usb: xhci: dbc: add bulk out and bulk in interfaces Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-03 09:30 +0100
  [PATCH v2 07/12] usb: xhci: dbc: handle dbc-configured exit Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-03 09:30 +0100
  [PATCH v2 01/12] usb: xhci: add sysfs file for xHCI debug port Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-03 09:30 +0100
  [PATCH v2 10/12] usb: xhci: dbc: add handshake between debug target and host Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-03 09:30 +0100
  [PATCH v2 05/12] usb: xhci: dbc: add debug buffer Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-03 09:30 +0100
  [PATCH v2 03/12] usb: xhci: dbc: probe and setup xhci debug capability Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-03 09:30 +0100

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