layerscape: add ls1088ardb device support

[openwrt/staging/yousong.git] / target / linux / layerscape / patches-4.4 / 7193-staging-fsl-mc-add-device-binding-path-driver_overri.patch

diff --git a/target/linux/layerscape/patches-4.4/7193-staging-fsl-mc-add-device-binding-path-driver_overri.patch b/target/linux/layerscape/patches-4.4/7193-staging-fsl-mc-add-device-binding-path-driver_overri.patch
new file mode 100644 (file)
index 0000000..60d294a
--- /dev/null
+++ b/target/linux/layerscape/patches-4.4/7193-staging-fsl-mc-add-device-binding-path-driver_overri.patch
@@ -0,0 +1,111 @@
+From 0bda83c15b2ecfc45fac0656df15d4f4fa65afa9 Mon Sep 17 00:00:00 2001
+From: Bharat Bhushan <bharat.bhushan@freescale.com>
+Date: Wed, 18 Mar 2015 17:32:59 -0500
+Subject: [PATCH 193/226] staging: fsl-mc: add device binding path
+ 'driver_override'
+
+This patch is required for vfio-fsl-mc meta driver to successfully bind
+layerscape container devices for device passthrough. This patch adds
+a mechanism to allow a layerscape device to specify a driver rather than
+a layerscape driver provide a device match.
+
+This patch is based on following proposed patches for PCI and platform devices
+- https://lkml.org/lkml/2014/4/8/571  :- For Platform devices
+- http://lists-archives.com/linux-kernel/28030441-pci-introduce-new-device-binding-path-using-pci_dev-driver_override.html  :- For PCI devices
+
+Example to allow a device (dprc.1) to specifically bind
+with driver (vfio-fsl-mc):-
+- echo vfio-fsl-mc > /sys/bus/fsl-mc/devices/dprc.1/driver_override
+- echo dprc.1 > /sys/bus/fsl-mc/drivers/fsl_mc_dprc/unbind
+- echo dprc.1 > /sys/bus/fsl-mc/drivers/vfio-fsl-mc/bind
+
+Signed-off-by: J. German Rivera <German.Rivera@freescale.com>
+(Stuart: resolved merge conflicts)
+Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com>
+---
+ drivers/staging/fsl-mc/bus/mc-bus.c |   53 +++++++++++++++++++++++++++++++++++
+ 1 file changed, 53 insertions(+)
+
+--- a/drivers/staging/fsl-mc/bus/mc-bus.c
++++ b/drivers/staging/fsl-mc/bus/mc-bus.c
+@@ -42,6 +42,12 @@ static int fsl_mc_bus_match(struct devic
+       if (WARN_ON(!fsl_mc_bus_exists()))
+               goto out;
+ 
++      /* When driver_override is set, only bind to the matching driver */
++      if (mc_dev->driver_override) {
++              found = !strcmp(mc_dev->driver_override, mc_drv->driver.name);
++              goto out;
++      }
++
+       if (!mc_drv->match_id_table)
+               goto out;
+ 
+@@ -96,6 +102,50 @@ static ssize_t modalias_show(struct devi
+ }
+ static DEVICE_ATTR_RO(modalias);
+ 
++static ssize_t driver_override_store(struct device *dev,
++                                   struct device_attribute *attr,
++                                   const char *buf, size_t count)
++{
++      struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
++      const char *driver_override, *old = mc_dev->driver_override;
++      char *cp;
++
++      if (WARN_ON(dev->bus != &fsl_mc_bus_type))
++              return -EINVAL;
++
++      if (count > PATH_MAX)
++              return -EINVAL;
++
++      driver_override = kstrndup(buf, count, GFP_KERNEL);
++      if (!driver_override)
++              return -ENOMEM;
++
++      cp = strchr(driver_override, '\n');
++      if (cp)
++              *cp = '\0';
++
++      if (strlen(driver_override)) {
++              mc_dev->driver_override = driver_override;
++      } else {
++              kfree(driver_override);
++              mc_dev->driver_override = NULL;
++      }
++
++      kfree(old);
++
++      return count;
++}
++
++static ssize_t driver_override_show(struct device *dev,
++                                  struct device_attribute *attr, char *buf)
++{
++      struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
++
++      return sprintf(buf, "%s\n", mc_dev->driver_override);
++}
++
++static DEVICE_ATTR_RW(driver_override);
++
+ static ssize_t rescan_store(struct device *dev,
+                           struct device_attribute *attr,
+                           const char *buf, size_t count)
+@@ -127,6 +177,7 @@ static DEVICE_ATTR_WO(rescan);
+ static struct attribute *fsl_mc_dev_attrs[] = {
+       &dev_attr_modalias.attr,
+       &dev_attr_rescan.attr,
++      &dev_attr_driver_override.attr,
+       NULL,
+ };
+ 
+@@ -677,6 +728,8 @@ void fsl_mc_device_remove(struct fsl_mc_
+               }
+       }
+ 
++      kfree(mc_dev->driver_override);
++      mc_dev->driver_override = NULL;
+       if (mc_bus)
+               devm_kfree(mc_dev->dev.parent, mc_bus);
+       else