thunderbolt: Introduce thunderbolt bus and connection manager

Thunderbolt fabric consists of one or more switches. This fabric is
called domain and it is controlled by an entity called connection
manager. The connection manager can be either internal (driven by a
firmware running on the host controller) or external (software driver).
This driver currently implements support for the latter.

In order to manage switches and their properties more easily we model
this domain structure as a Linux bus. Each host controller adds a domain
device to this bus, and these devices are named as domainN where N
stands for index or id of the current domain.

We then abstract connection manager specific operations into a new
structure tb_cm_ops and convert the existing tb.c to fill those
accordingly. This makes it easier to add support for the internal
connection manager in subsequent patches.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Michael Jamet <michael.jamet@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>

1 files changed, 23 insertions, 8 deletions

diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index ed75c49748f5..c1113a3c4128 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -586,16 +586,16 @@ static int nhi_suspend_noirq(struct device *dev)
 {
         struct pci_dev *pdev = to_pci_dev(dev);
         struct tb *tb = pci_get_drvdata(pdev);
-        thunderbolt_suspend(tb);
-        return 0;
+
+        return tb_domain_suspend_noirq(tb);
 }
 
 static int nhi_resume_noirq(struct device *dev)
 {
         struct pci_dev *pdev = to_pci_dev(dev);
         struct tb *tb = pci_get_drvdata(pdev);
-        thunderbolt_resume(tb);
-        return 0;
+
+        return tb_domain_resume_noirq(tb);
 }
 
 static void nhi_shutdown(struct tb_nhi *nhi)
@@ -715,12 +715,17 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
         iowrite32(3906250 / 10000, nhi->iobase + 0x38c00);
 
         dev_info(&nhi->pdev->dev, "NHI initialized, starting thunderbolt\n");
-        tb = thunderbolt_alloc_and_start(nhi);
-        if (!tb) {
+        tb = tb_probe(nhi);
+        if (!tb)
+                return -ENODEV;
+
+        res = tb_domain_add(tb);
+        if (res) {
                 /*
                  * At this point the RX/TX rings might already have been
                  * activated. Do a proper shutdown.
                  */
+                tb_domain_put(tb);
                 nhi_shutdown(nhi);
                 return -EIO;
         }
@@ -733,7 +738,8 @@ static void nhi_remove(struct pci_dev *pdev)
 {
         struct tb *tb = pci_get_drvdata(pdev);
         struct tb_nhi *nhi = tb->nhi;
-        thunderbolt_shutdown_and_free(tb);
+
+        tb_domain_remove(tb);
         nhi_shutdown(nhi);
 }
 
@@ -797,14 +803,23 @@ static struct pci_driver nhi_driver = {
 
 static int __init nhi_init(void)
 {
+        int ret;
+
         if (!dmi_match(DMI_BOARD_VENDOR, "Apple Inc."))
                 return -ENOSYS;
-        return pci_register_driver(&nhi_driver);
+        ret = tb_domain_init();
+        if (ret)
+                return ret;
+        ret = pci_register_driver(&nhi_driver);
+        if (ret)
+                tb_domain_exit();
+        return ret;
 }
 
 static void __exit nhi_unload(void)
 {
         pci_unregister_driver(&nhi_driver);
+        tb_domain_exit();
 }
 
 module_init(nhi_init);