usb: xhci-pci: Add DM support

This patch adds DM support to the xHCI PCI driver. Enabling its use
e.g. in x86 platforms.

Status: On the congatec BayTrail SoM, xHCI still does not work
correctly with this patch. Some internal timeouts lead to resets (BUG).
Additional work is needed here. I'm posting this version as WIP so that
other developers interested in this support might use it as a start.
I might get back to it in a few weeks as well.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: George McCollister <george.mccollister@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/usb/host/xhci-pci.c

@@ -7,12 +7,15 @@
  */
 
 #include <common.h>
+#include <dm.h>
 #include <errno.h>
 #include <pci.h>
 #include <usb.h>
 
 #include "xhci.h"
 
+#ifndef CONFIG_DM_USB
+
 /*
  * Create the appropriate control structures to manage a new XHCI host
  * controller.
@@ -58,3 +61,81 @@ int xhci_hcd_init(int index, struct xhci_hccr **ret_hccr,
 void xhci_hcd_stop(int index)
 {
 }
+
+#else
+
+struct xhci_pci_priv {
+	struct xhci_ctrl ctrl;	/* Needs to come first in this struct! */
+};
+
+static void xhci_pci_init(struct udevice *dev, struct xhci_hccr **ret_hccr,
+			  struct xhci_hcor **ret_hcor)
+{
+	struct xhci_hccr *hccr;
+	struct xhci_hcor *hcor;
+	u32 cmd;
+
+	hccr = (struct xhci_hccr *)dm_pci_map_bar(dev,
+			PCI_BASE_ADDRESS_0, PCI_REGION_MEM);
+	hcor = (struct xhci_hcor *)((uintptr_t) hccr +
+			HC_LENGTH(xhci_readl(&hccr->cr_capbase)));
+
+	debug("XHCI-PCI init hccr 0x%x and hcor 0x%x hc_length %d\n",
+	      (u32)hccr, (u32)hcor,
+	      (u32)HC_LENGTH(xhci_readl(&hccr->cr_capbase)));
+
+	*ret_hccr = hccr;
+	*ret_hcor = hcor;
+
+	/* enable busmaster */
+	dm_pci_read_config32(dev, PCI_COMMAND, &cmd);
+	cmd |= PCI_COMMAND_MASTER;
+	dm_pci_write_config32(dev, PCI_COMMAND, cmd);
+}
+
+static int xhci_pci_probe(struct udevice *dev)
+{
+	struct xhci_hccr *hccr;
+	struct xhci_hcor *hcor;
+
+	xhci_pci_init(dev, &hccr, &hcor);
+
+	return xhci_register(dev, hccr, hcor);
+}
+
+static int xhci_pci_remove(struct udevice *dev)
+{
+	int ret;
+
+	ret = xhci_deregister(dev);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static const struct udevice_id xhci_pci_ids[] = {
+	{ .compatible = "xhci-pci" },
+	{ }
+};
+
+U_BOOT_DRIVER(xhci_pci) = {
+	.name	= "xhci_pci",
+	.id	= UCLASS_USB,
+	.probe = xhci_pci_probe,
+	.remove = xhci_pci_remove,
+	.of_match = xhci_pci_ids,
+	.ops	= &xhci_usb_ops,
+	.platdata_auto_alloc_size = sizeof(struct usb_platdata),
+	.priv_auto_alloc_size = sizeof(struct xhci_pci_priv),
+	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
+};
+
+static struct pci_device_id xhci_pci_supported[] = {
+	{ PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0) },
+	{},
+};
+
+U_BOOT_PCI_DEVICE(xhci_pci, xhci_pci_supported);
+
+#endif /* CONFIG_DM_USB */