linux-kernel - [PATCH 08/15] Introduce Cadence USBSSP DRD driver

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Date:   Tue, 3 Jul 2018 20:57:52 +0100
From:   Pawel Laszczak <pawell@...ence.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, Felipe Balbi <balbi@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <ltyrala@...ence.com>,
        <pawell@...ence.com>
Subject: [PATCH 08/15] Introduce Cadence USBSSP DRD driver - added gadget-ext-caps.h

Signed-off-by: Laszczak Pawel <pawell@...ence.com>
---
 drivers/usb/usbssp/gadget-ext-caps.h | 99 ++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 drivers/usb/usbssp/gadget-ext-caps.h

diff --git a/drivers/usb/usbssp/gadget-ext-caps.h b/drivers/usb/usbssp/gadget-ext-caps.h
new file mode 100644
index 000000000000..3b1f7b046440
--- /dev/null
+++ b/drivers/usb/usbssp/gadget-ext-caps.h
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USBSSP device controller driver
+ *
+ * Copyright (C) 2018 Cadence.
+ *
+ * Author: Pawel Laszczak
+ * Some code borrowed from the Linux XHCI driver.
+ */
+
+/* Up to 16 ms to halt an DC */
+#define USBSSP_MAX_HALT_USEC		(16*1000)
+
+/* DC not running - set to 1 when run/stop bit is cleared. */
+#define USBSSP_STS_HALT			(1<<0)
+
+/* HCCPARAMS offset from PCI base address */
+#define USBSSP_HCC_PARAMS_OFFSET	0x10
+/* HCCPARAMS contains the first extended capability pointer */
+#define USBSSP_HCC_EXT_CAPS(p)	(((p)>>16)&0xffff)
+
+/* Command and Status registers offset from the Operational Registers address */
+#define USBSSP_CMD_OFFSET		0x00
+#define USBSSP_STS_OFFSET		0x04
+
+/* Capability Register */
+/* bits 7:0 - how long is the Capabilities register */
+#define USBSSP_HC_LENGTH(p)		(((p)>>00)&0x00ff)
+
+/* Extended capability register fields */
+#define USBSSP_EXT_CAPS_ID(p)		(((p)>>0)&0xff)
+#define USBSSP_EXT_CAPS_NEXT(p)		(((p)>>8)&0xff)
+#define	v_EXT_CAPS_VAL(p)		((p)>>16)
+/* Extended capability IDs - ID 0 reserved */
+#define USBSSP_EXT_CAPS_PROTOCOL		2
+
+/* USB 2.0 hardware LMP capability*/
+#define USBSSP_HLC			(1 << 19)
+#define USBSSP_BLC			(1 << 20)
+
+/* command register values to disable interrupts and halt the DC */
+/* start/stop DC execution - do not write unless DC is halted*/
+#define USBSSP_CMD_RUN			(1 << 0)
+/* Event Interrupt Enable - get irq when EINT bit is set in USBSTS register */
+#define USBSSP_CMD_EIE			(1 << 2)
+/* Host System Error Interrupt Enable - get irq when HSEIE bit set in USBSTS */
+#define USBSSP_CMD_HSEIE		(1 << 3)
+/* Enable Wrap Event - '1' means DC generates an event when MFINDEX wraps. */
+#define USBSSP_CMD_EWE			(1 << 10)
+
+#define USBSSP_IRQS	(USBSSP_CMD_EIE | USBSSP_CMD_HSEIE | USBSSP_CMD_EWE)
+
+/* true: Controller Not Ready to accept doorbell or op reg writes after reset */
+#define USBSSP_STS_CNR			(1 << 11)
+
+#include <linux/io.h>
+
+/**
+ * Find the offset of the extended capabilities with capability ID id.
+ *
+ * @base	PCI MMIO registers base address.
+ * @start	address at which to start looking, (0 or HCC_PARAMS to start at
+ *		beginning of list)
+ * @id		Extended capability ID to search for.
+ *
+ * Returns the offset of the next matching extended capability structure.
+ * Some capabilities can occur several times,
+ * e.g., the USBSSP_EXT_CAPS_PROTOCOL, and this provides a way to find them all.
+ */
+
+static inline int usbssp_find_next_ext_cap(
+		void __iomem *base, u32 start, int id)
+{
+	u32 val;
+	u32 next;
+	u32 offset;
+
+	offset = start;
+	if (!start || start == USBSSP_HCC_PARAMS_OFFSET) {
+		val = readl(base + USBSSP_HCC_PARAMS_OFFSET);
+		if (val == ~0)
+			return 0;
+		offset = USBSSP_HCC_EXT_CAPS(val) << 2;
+		if (!offset)
+			return 0;
+	};
+	do {
+		val = readl(base + offset);
+		if (val == ~0)
+			return 0;
+		if (USBSSP_EXT_CAPS_ID(val) == id && offset != start)
+			return offset;
+
+		next = USBSSP_EXT_CAPS_NEXT(val);
+		offset += next << 2;
+	} while (next);
+
+	return 0;
+}
-- 
2.17.1