grub xhci support

see:

https://github.com/9elements/grub/commits/xhci-module-upstreaming-squash_v4/

grub only supports xhci on bios/uefi targets, but not coreboot.
some newer machines don't have ps/2 controllers, and boot in a
way where ehci isn't available at startup; the controller can't
be used by ehci code, there must be xhci support.

the code is from Patrick Rudolph working on behalf of 9elements.
the code was also sent here for review:

https://lists.gnu.org/archive/html/grub-devel/2020-12/msg00111.html

however, upstream never merged these patches. libreboot will have
to maintain these from now on. the patches have been rebased for
use with grub 2.12.

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 121 insertions, 0 deletions

diff --git a/config/grub/patches/0005-xhci/0004-grub-core-bus-usb-Add-function-pointer-for-attach-de.patch b/config/grub/patches/0005-xhci/0004-grub-core-bus-usb-Add-function-pointer-for-attach-de.patch
new file mode 100644
index 00000000..a090e0ea
--- /dev/null
+++ b/config/grub/patches/0005-xhci/0004-grub-core-bus-usb-Add-function-pointer-for-attach-de.patch
@@ -0,0 +1,121 @@
+From 89701aba00caa81bb566ab10da0c89264393be30 Mon Sep 17 00:00:00 2001
+From: Patrick Rudolph <patrick.rudolph@9elements.com>
+Date: Sun, 15 Nov 2020 19:51:42 +0100
+Subject: [PATCH 4/8] grub-core/bus/usb: Add function pointer for attach/detach
+ events
+
+The xHCI code needs to be called for attaching or detaching a device.
+Introduce two functions pointers and call it from the USB hub code.
+
+Will be used in future commits, currently this doesn't change any functionality.
+
+Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
+---
+ grub-core/bus/usb/ehci.c   |  2 ++
+ grub-core/bus/usb/ohci.c   |  2 ++
+ grub-core/bus/usb/uhci.c   |  2 ++
+ grub-core/bus/usb/usbhub.c | 19 +++++++++++++++++++
+ include/grub/usb.h         |  4 ++++
+ 5 files changed, 29 insertions(+)
+
+diff --git a/grub-core/bus/usb/ehci.c b/grub-core/bus/usb/ehci.c
+index 9abebc6bd..953b851c0 100644
+--- a/grub-core/bus/usb/ehci.c
++++ b/grub-core/bus/usb/ehci.c
+@@ -1812,6 +1812,8 @@ static struct grub_usb_controller_dev usb_controller = {
+   .hubports = grub_ehci_hubports,
+   .portstatus = grub_ehci_portstatus,
+   .detect_dev = grub_ehci_detect_dev,
++  .attach_dev = NULL,
++  .detach_dev = NULL,
+   /* estimated max. count of TDs for one bulk transfer */
+   .max_bulk_tds = GRUB_EHCI_N_TD * 3 / 4
+ };
+diff --git a/grub-core/bus/usb/ohci.c b/grub-core/bus/usb/ohci.c
+index 5363a61f6..7a3f3e154 100644
+--- a/grub-core/bus/usb/ohci.c
++++ b/grub-core/bus/usb/ohci.c
+@@ -1440,6 +1440,8 @@ static struct grub_usb_controller_dev usb_controller =
+   .hubports = grub_ohci_hubports,
+   .portstatus = grub_ohci_portstatus,
+   .detect_dev = grub_ohci_detect_dev,
++  .attach_dev = NULL,
++  .detach_dev = NULL,
+   /* estimated max. count of TDs for one bulk transfer */
+   .max_bulk_tds = GRUB_OHCI_TDS * 3 / 4
+ };
+diff --git a/grub-core/bus/usb/uhci.c b/grub-core/bus/usb/uhci.c
+index 0fdea4c1e..03c4605b2 100644
+--- a/grub-core/bus/usb/uhci.c
++++ b/grub-core/bus/usb/uhci.c
+@@ -845,6 +845,8 @@ static struct grub_usb_controller_dev usb_controller =
+   .hubports = grub_uhci_hubports,
+   .portstatus = grub_uhci_portstatus,
+   .detect_dev = grub_uhci_detect_dev,
++  .attach_dev = NULL,
++  .detach_dev = NULL,
+   /* estimated max. count of TDs for one bulk transfer */
+   .max_bulk_tds = N_TD * 3 / 4
+ };
+diff --git a/grub-core/bus/usb/usbhub.c b/grub-core/bus/usb/usbhub.c
+index 2ae29cba1..8e963e84b 100644
+--- a/grub-core/bus/usb/usbhub.c
++++ b/grub-core/bus/usb/usbhub.c
+@@ -66,6 +66,15 @@ grub_usb_hub_add_dev (grub_usb_controller_t controller,
+   dev->split_hubport = split_hubport;
+   dev->split_hubaddr = split_hubaddr;
+ 
++  if (controller->dev->attach_dev) {
++    err = controller->dev->attach_dev (controller, dev);
++    if (err)
++      {
++	grub_free (dev);
++	return NULL;
++      }
++  }
++
+   err = grub_usb_device_initialize (dev);
+   if (err)
+     {
+@@ -405,6 +414,8 @@ static void
+ detach_device (grub_usb_device_t dev)
+ {
+   unsigned i;
++  grub_usb_err_t err;
++
+   int k;
+   if (!dev)
+     return;
+@@ -425,6 +436,14 @@ detach_device (grub_usb_device_t dev)
+ 	  if (inter && inter->detach_hook)
+ 	    inter->detach_hook (dev, i, k);
+ 	}
++  if (dev->controller.dev->detach_dev) {
++    err = dev->controller.dev->detach_dev (&dev->controller, dev);
++    if (err)
++      {
++	// XXX
++      }
++  }
++
+   grub_usb_devs[dev->addr] = 0;
+ }
+ 
+diff --git a/include/grub/usb.h b/include/grub/usb.h
+index ea6ee8c2c..4dd179db2 100644
+--- a/include/grub/usb.h
++++ b/include/grub/usb.h
+@@ -126,6 +126,10 @@ struct grub_usb_controller_dev
+ 
+   grub_usb_speed_t (*detect_dev) (grub_usb_controller_t dev, int port, int *changed);
+ 
++  grub_usb_err_t (*attach_dev) (grub_usb_controller_t ctrl, grub_usb_device_t dev);
++
++  grub_usb_err_t (*detach_dev) (grub_usb_controller_t ctrl, grub_usb_device_t dev);
++
+   /* Per controller flag - port reset pending, don't do another reset */
+   grub_uint64_t pending_reset;
+ 
+-- 
+2.39.2
+