summaryrefslogtreecommitdiff
path: root/drivers/thunderbolt/switch.c
diff options
context:
space:
mode:
authorMika Westerberg <mika.westerberg@linux.intel.com>2017-06-06 15:25:14 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-09 12:42:43 +0300
commit3e13676862f90dbf5b00d57d5599e57788289897 (patch)
treee0dc4f8ab2798c10c404a1cf52f8fda62c5b9863 /drivers/thunderbolt/switch.c
parent2c3c4197c9dd878e39e249e1da64bcffceb8a5c4 (diff)
downloadlinux-3e13676862f90dbf5b00d57d5599e57788289897.tar.xz
thunderbolt: Add support for DMA configuration based mailbox
The DMA (NHI) port of a switch provides access to the NVM of the host controller (and devices starting from Intel Alpine Ridge). The NVM contains also more complete DROM for the root switch including vendor and device identification strings. This will look for the DMA port capability for each switch and if found populates sw->dma_port. We then teach tb_drom_read() to read the DROM information from NVM if available for the root switch. The DMA port capability also supports upgrading the NVM for both host controller and devices which will be added in subsequent patches. This code is based on the work done by Amir Levy and Michael Jamet. Signed-off-by: Michael Jamet <michael.jamet@intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Andreas Noever <andreas.noever@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/thunderbolt/switch.c')
-rw-r--r--drivers/thunderbolt/switch.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 6384061100b0..4b47e0999cda 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -377,6 +377,8 @@ static void tb_switch_release(struct device *dev)
{
struct tb_switch *sw = tb_to_switch(dev);
+ dma_port_free(sw->dma_port);
+
kfree(sw->uuid);
kfree(sw->device_name);
kfree(sw->vendor_name);
@@ -570,6 +572,25 @@ static void tb_switch_set_uuid(struct tb_switch *sw)
sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
}
+static void tb_switch_add_dma_port(struct tb_switch *sw)
+{
+ switch (sw->generation) {
+ case 3:
+ break;
+
+ case 2:
+ /* Only root switch can be upgraded */
+ if (tb_route(sw))
+ return;
+ break;
+
+ default:
+ return;
+ }
+
+ sw->dma_port = dma_port_alloc(sw);
+}
+
/**
* tb_switch_add() - Add a switch to the domain
* @sw: Switch to add
@@ -586,6 +607,15 @@ int tb_switch_add(struct tb_switch *sw)
{
int i, ret;
+ /*
+ * Initialize DMA control port now before we read DROM. Recent
+ * host controllers have more complete DROM on NVM that includes
+ * vendor and model identification strings which we then expose
+ * to the userspace. NVM can be accessed through DMA
+ * configuration based mailbox.
+ */
+ tb_switch_add_dma_port(sw);
+
/* read drom */
ret = tb_drom_read(sw);
if (ret) {