bcm53xx: add xHCI support

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 46080

1 files changed, 99 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/patches-3.18/820-xhci-add-Broadcom-specific-fake-doorbell.patch b/target/linux/bcm53xx/patches-3.18/820-xhci-add-Broadcom-specific-fake-doorbell.patch
new file mode 100644
index 0000000000..87d23c3a51
--- /dev/null
+++ b/target/linux/bcm53xx/patches-3.18/820-xhci-add-Broadcom-specific-fake-doorbell.patch
@@ -0,0 +1,99 @@
+From 9cc14ca0aae53c16d10ffea49848ac61a5015562 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Sun, 21 Jun 2015 11:10:49 +0200
+Subject: [PATCH] xhci: add Broadcom specific fake doorbell
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This fixes problem with controller seeing devices only in some small
+percentage of cold boots.
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+---
+ drivers/usb/host/xhci.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 62 insertions(+)
+
+diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
+index 3bceabe..0737ab2 100644
+--- a/drivers/usb/host/xhci.c
++++ b/drivers/usb/host/xhci.c
+@@ -122,6 +122,64 @@ int xhci_halt(struct xhci_hcd *xhci)
+ 	return ret;
+ }
+ 
++#ifdef CONFIG_ARCH_BCM_5301X
++int xhci_fake_doorbell(struct xhci_hcd *xhci, int slot_id)
++{
++	unsigned int temp1, ret;
++
++	/* alloc a virt device for slot */
++	if (!xhci_alloc_virt_device(xhci, slot_id, 0, GFP_NOIO)) {
++		xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
++		return 1;
++        }
++
++	/* ring fake doorbell for slot_id ep 0 */
++	xhci_ring_ep_doorbell(xhci, slot_id, 0, 0);
++	mdelay(1);
++
++	/* read the status register to check if HSE is set or not? */
++	temp1 = readl(&xhci->op_regs->status);
++	xhci_dbg(xhci, "op reg status = %x\n",temp1);
++
++	/* clear HSE if set */
++	if(temp1 & STS_FATAL) {
++		xhci_dbg(xhci, "HSE problem detected\n");
++		temp1 &= ~(0x1fff);
++		temp1 |= STS_FATAL;
++		xhci_dbg(xhci, "temp1=%x\n",temp1);
++		writel(temp1, &xhci->op_regs->status);
++		mdelay(1);
++		temp1 = readl(&xhci->op_regs->status);
++		xhci_dbg(xhci, "After clear op reg status=%x\n", temp1);
++	}
++
++	/* Free virt device */
++	xhci_free_virt_device(xhci, slot_id);
++
++	/* Run the controller if needed */
++	temp1 = readl(&xhci->op_regs->command);
++	if (temp1 & CMD_RUN)
++		return 0;
++	temp1 |= (CMD_RUN);
++
++	writel(temp1, &xhci->op_regs->command);
++	/*
++	 * Wait for the HCHalted Status bit to be 0 to indicate the host is running.
++	 */
++	ret = xhci_handshake(xhci, &xhci->op_regs->status,
++			     STS_HALT, 0, XHCI_MAX_HALT_USEC);
++
++	if (ret == -ETIMEDOUT) {
++		xhci_err(xhci, "Host took too long to start, "
++				"waited %u microseconds.\n",
++				XHCI_MAX_HALT_USEC);
++		return 1;
++	}
++
++	return 0;
++}
++#endif /* CONFIG_ARCH_BCM_5301X */
++
+ /*
+  * Set the run bit and wait for the host to be running.
+  */
+@@ -146,6 +204,10 @@ static int xhci_start(struct xhci_hcd *xhci)
+ 		xhci_err(xhci, "Host took too long to start, "
+ 				"waited %u microseconds.\n",
+ 				XHCI_MAX_HALT_USEC);
++#ifdef CONFIG_ARCH_BCM_5301X
++	xhci_fake_doorbell(xhci, 1);
++#endif /* CONFIG_ARCH_BCM_5301X */
++
+ 	if (!ret)
+ 		xhci->xhc_state &= ~XHCI_STATE_HALTED;
+ 	return ret;
+-- 
+1.8.4.5
+