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authorSimon Glass <sjg@chromium.org>2015-03-05 12:25:28 -0700
committerSimon Glass <sjg@chromium.org>2015-04-16 19:27:43 -0600
commit36d0d3b4b4974f4183609ac8b4d77a1f46acba55 (patch)
tree859816b8b1c7b1c755ab2853a7736287bf9eab5d /drivers/pci/pci-emul-uclass.c
parent537849aaa1b8f90d99f4c31a2945ab0b817aa599 (diff)
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dm: sandbox: pci: Add a PCI emulation uclass
Since sandbox does not have real devices (unless it borrows those from the host) it must use emulations. Provide a uclass which permits PCI operations to be passed through to an emulation device. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/pci/pci-emul-uclass.c')
-rw-r--r--drivers/pci/pci-emul-uclass.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/drivers/pci/pci-emul-uclass.c b/drivers/pci/pci-emul-uclass.c
new file mode 100644
index 0000000..0f8e3c9
--- /dev/null
+++ b/drivers/pci/pci-emul-uclass.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <pci.h>
+#include <dm/lists.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct sandbox_pci_priv {
+ int dev_count;
+};
+
+int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn,
+ struct udevice **emulp)
+{
+ struct udevice *dev;
+ int ret;
+
+ ret = pci_bus_find_devfn(bus, find_devfn, &dev);
+ if (ret) {
+ debug("%s: Could not find emulator for dev %x\n", __func__,
+ find_devfn);
+ return ret;
+ }
+
+ ret = device_find_first_child(dev, emulp);
+ if (ret)
+ return ret;
+
+ return *emulp ? 0 : -ENODEV;
+}
+
+static int sandbox_pci_emul_post_probe(struct udevice *dev)
+{
+ struct sandbox_pci_priv *priv = dev->uclass->priv;
+
+ priv->dev_count++;
+ sandbox_set_enable_pci_map(true);
+
+ return 0;
+}
+
+static int sandbox_pci_emul_pre_remove(struct udevice *dev)
+{
+ struct sandbox_pci_priv *priv = dev->uclass->priv;
+
+ priv->dev_count--;
+ sandbox_set_enable_pci_map(priv->dev_count > 0);
+
+ return 0;
+}
+
+UCLASS_DRIVER(pci_emul) = {
+ .id = UCLASS_PCI_EMUL,
+ .name = "pci_emul",
+ .post_probe = sandbox_pci_emul_post_probe,
+ .pre_remove = sandbox_pci_emul_pre_remove,
+ .priv_auto_alloc_size = sizeof(struct sandbox_pci_priv),
+};