dm: sandbox: Add a simple PCI driver

Add a driver which can access emulations of devices and make them available
in sandbox.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 8b7e2ee6b0adf673343c5b59a28eec6b1fed8e46..167d405918400b39edc3621edac6338257a38e1c 100644 (file)
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -9,4 +9,14 @@ config DM_PCI
          available PCI devices, allows scanning of PCI buses and provides
          device configuration support.
 
+config PCI_SANDBOX
+       bool "Sandbox PCI support"
+       depends on SANDBOX && DM_PCI
+       help
+         Support PCI on sandbox, as an emulated bus. This permits testing of
+         PCI feature such as bus scanning, device configuration and device
+         access. The available (emulated) devices are defined statically in
+         the device tree but the normal PCI scan technique is used to find
+         then.
+
 endmenu

diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index db82786e93f87cc151bece605f3dcf4f2548c0f4..9e2e5f9aff0e2227f75427d90004974899bc128b 100644 (file)
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -7,6 +7,7 @@
 
 ifneq ($(CONFIG_DM_PCI),)
 obj-$(CONFIG_PCI) += pci-uclass.o pci_compat.o
+obj-$(CONFIG_PCI_SANDBOX) += pci_sandbox.o
 else
 obj-$(CONFIG_PCI) += pci.o
 endif

diff --git a/drivers/pci/pci_sandbox.c b/drivers/pci/pci_sandbox.c
new file mode 100644 (file)
index 0000000..6de5130
--- /dev/null
+++ b/drivers/pci/pci_sandbox.c
@@ -0,0 +1,79 @@
+/*
+ * 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 <inttypes.h>
+#include <pci.h>
+#include <dm/root.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int sandbox_pci_write_config(struct udevice *bus, pci_dev_t devfn,
+                                   uint offset, ulong value,
+                                   enum pci_size_t size)
+{
+       struct dm_pci_emul_ops *ops;
+       struct udevice *emul;
+       int ret;
+
+       ret = sandbox_pci_get_emul(bus, devfn, &emul);
+       if (ret)
+               return ret == -ENODEV ? 0 : ret;
+       ops = pci_get_emul_ops(emul);
+       if (!ops || !ops->write_config)
+               return -ENOSYS;
+
+       return ops->write_config(emul, offset, value, size);
+}
+
+static int sandbox_pci_read_config(struct udevice *bus, pci_dev_t devfn,
+                                  uint offset, ulong *valuep,
+                                  enum pci_size_t size)
+{
+       struct dm_pci_emul_ops *ops;
+       struct udevice *emul;
+       int ret;
+
+       /* Prepare the default response */
+       *valuep = pci_get_ff(size);
+       ret = sandbox_pci_get_emul(bus, devfn, &emul);
+       if (ret)
+               return ret == -ENODEV ? 0 : ret;
+       ops = pci_get_emul_ops(emul);
+       if (!ops || !ops->read_config)
+               return -ENOSYS;
+
+       return ops->read_config(emul, offset, valuep, size);
+}
+
+static int sandbox_pci_child_post_bind(struct udevice *dev)
+{
+       /* Attach an emulator if we can */
+       return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
+}
+
+static const struct dm_pci_ops sandbox_pci_ops = {
+       .read_config = sandbox_pci_read_config,
+       .write_config = sandbox_pci_write_config,
+};
+
+static const struct udevice_id sandbox_pci_ids[] = {
+       { .compatible = "sandbox,pci" },
+       { }
+};
+
+U_BOOT_DRIVER(pci_sandbox) = {
+       .name   = "pci_sandbox",
+       .id     = UCLASS_PCI,
+       .of_match = sandbox_pci_ids,
+       .ops    = &sandbox_pci_ops,
+       .child_post_bind = sandbox_pci_child_post_bind,
+       .per_child_platdata_auto_alloc_size =
+                       sizeof(struct pci_child_platdata),
+};