1 files changed, 477 insertions, 0 deletions
diff --git a/drivers/usb/c67x00/c67x00-ll-hpi.c b/drivers/usb/c67x00/c67x00-ll-hpi.c
new file mode 100644
index 000000000..e1fe36031
--- /dev/null
+++ b/drivers/usb/c67x00/c67x00-ll-hpi.c
@@ -0,0 +1,477 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * c67x00-ll-hpi.c: Cypress C67X00 USB Low level interface using HPI
+ *
+ * Copyright (C) 2006-2008 Barco N.V.
+ *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
+ *    based on multiple host controller drivers inside the linux kernel.
+ */
+
+#include <asm/byteorder.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/usb/c67x00.h>
+#include "c67x00.h"
+
+#define COMM_REGS 14
+
+struct c67x00_lcp_int_data {
+	u16 regs[COMM_REGS];
+};
+
+/* -------------------------------------------------------------------------- */
+/* Interface definitions */
+
+#define COMM_ACK			0x0FED
+#define COMM_NAK			0xDEAD
+
+#define COMM_RESET			0xFA50
+#define COMM_EXEC_INT			0xCE01
+#define COMM_INT_NUM			0x01C2
+
+/* Registers 0 to COMM_REGS-1 */
+#define COMM_R(x)			(0x01C4 + 2 * (x))
+
+#define HUSB_SIE_pCurrentTDPtr(x)	((x) ? 0x01B2 : 0x01B0)
+#define HUSB_SIE_pTDListDone_Sem(x)	((x) ? 0x01B8 : 0x01B6)
+#define HUSB_pEOT			0x01B4
+
+/* Software interrupts */
+/* 114, 115: */
+#define HUSB_SIE_INIT_INT(x)		((x) ? 0x0073 : 0x0072)
+#define HUSB_RESET_INT			0x0074
+
+#define SUSB_INIT_INT			0x0071
+#define SUSB_INIT_INT_LOC		(SUSB_INIT_INT * 2)
+
+/* -----------------------------------------------------------------------
+ * HPI implementation
+ *
+ * The c67x00 chip also support control via SPI or HSS serial
+ * interfaces. However, this driver assumes that register access can
+ * be performed from IRQ context. While this is a safe assumption with
+ * the HPI interface, it is not true for the serial interfaces.
+ */
+
+/* HPI registers */
+#define HPI_DATA	0
+#define HPI_MAILBOX	1
+#define HPI_ADDR	2
+#define HPI_STATUS	3
+
+/*
+ * According to CY7C67300 specification (tables 140 and 141) HPI read and
+ * write cycle duration Tcyc must be at least 6T long, where T is 1/48MHz,
+ * which is 125ns.
+ */
+#define HPI_T_CYC_NS	125
+
+static inline u16 hpi_read_reg(struct c67x00_device *dev, int reg)
+{
+	ndelay(HPI_T_CYC_NS);
+	return __raw_readw(dev->hpi.base + reg * dev->hpi.regstep);
+}
+
+static inline void hpi_write_reg(struct c67x00_device *dev, int reg, u16 value)
+{
+	ndelay(HPI_T_CYC_NS);
+	__raw_writew(value, dev->hpi.base + reg * dev->hpi.regstep);
+}
+
+static inline u16 hpi_read_word_nolock(struct c67x00_device *dev, u16 reg)
+{
+	hpi_write_reg(dev, HPI_ADDR, reg);
+	return hpi_read_reg(dev, HPI_DATA);
+}
+
+static u16 hpi_read_word(struct c67x00_device *dev, u16 reg)
+{
+	u16 value;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->hpi.lock, flags);
+	value = hpi_read_word_nolock(dev, reg);
+	spin_unlock_irqrestore(&dev->hpi.lock, flags);
+
+	return value;
+}
+
+static void hpi_write_word_nolock(struct c67x00_device *dev, u16 reg, u16 value)
+{
+	hpi_write_reg(dev, HPI_ADDR, reg);
+	hpi_write_reg(dev, HPI_DATA, value);
+}
+
+static void hpi_write_word(struct c67x00_device *dev, u16 reg, u16 value)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->hpi.lock, flags);
+	hpi_write_word_nolock(dev, reg, value);
+	spin_unlock_irqrestore(&dev->hpi.lock, flags);
+}
+
+/*
+ * Only data is little endian, addr has cpu endianess
+ */
+static void hpi_write_words_le16(struct c67x00_device *dev, u16 addr,
+				 __le16 *data, u16 count)
+{
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&dev->hpi.lock, flags);
+
+	hpi_write_reg(dev, HPI_ADDR, addr);
+	for (i = 0; i < count; i++)
+		hpi_write_reg(dev, HPI_DATA, le16_to_cpu(*data++));
+
+	spin_unlock_irqrestore(&dev->hpi.lock, flags);
+}
+
+/*
+ * Only data is little endian, addr has cpu endianess
+ */
+static void hpi_read_words_le16(struct c67x00_device *dev, u16 addr,
+				__le16 *data, u16 count)
+{
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&dev->hpi.lock, flags);
+	hpi_write_reg(dev, HPI_ADDR, addr);
+	for (i = 0; i < count; i++)
+		*data++ = cpu_to_le16(hpi_read_reg(dev, HPI_DATA));
+
+	spin_unlock_irqrestore(&dev->hpi.lock, flags);
+}
+
+static void hpi_set_bits(struct c67x00_device *dev, u16 reg, u16 mask)
+{
+	u16 value;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->hpi.lock, flags);
+	value = hpi_read_word_nolock(dev, reg);
+	hpi_write_word_nolock(dev, reg, value | mask);
+	spin_unlock_irqrestore(&dev->hpi.lock, flags);
+}
+
+static void hpi_clear_bits(struct c67x00_device *dev, u16 reg, u16 mask)
+{
+	u16 value;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->hpi.lock, flags);
+	value = hpi_read_word_nolock(dev, reg);
+	hpi_write_word_nolock(dev, reg, value & ~mask);
+	spin_unlock_irqrestore(&dev->hpi.lock, flags);
+}
+
+static u16 hpi_recv_mbox(struct c67x00_device *dev)
+{
+	u16 value;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->hpi.lock, flags);
+	value = hpi_read_reg(dev, HPI_MAILBOX);
+	spin_unlock_irqrestore(&dev->hpi.lock, flags);
+
+	return value;
+}
+
+static u16 hpi_send_mbox(struct c67x00_device *dev, u16 value)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->hpi.lock, flags);
+	hpi_write_reg(dev, HPI_MAILBOX, value);
+	spin_unlock_irqrestore(&dev->hpi.lock, flags);
+
+	return value;
+}
+
+u16 c67x00_ll_hpi_status(struct c67x00_device *dev)
+{
+	u16 value;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->hpi.lock, flags);
+	value = hpi_read_reg(dev, HPI_STATUS);
+	spin_unlock_irqrestore(&dev->hpi.lock, flags);
+
+	return value;
+}
+
+void c67x00_ll_hpi_reg_init(struct c67x00_device *dev)
+{
+	int i;
+
+	hpi_recv_mbox(dev);
+	c67x00_ll_hpi_status(dev);
+	hpi_write_word(dev, HPI_IRQ_ROUTING_REG, 0);
+
+	for (i = 0; i < C67X00_SIES; i++) {
+		hpi_write_word(dev, SIEMSG_REG(i), 0);
+		hpi_read_word(dev, SIEMSG_REG(i));
+	}
+}
+
+void c67x00_ll_hpi_enable_sofeop(struct c67x00_sie *sie)
+{
+	hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
+		     SOFEOP_TO_HPI_EN(sie->sie_num));
+}
+
+void c67x00_ll_hpi_disable_sofeop(struct c67x00_sie *sie)
+{
+	hpi_clear_bits(sie->dev, HPI_IRQ_ROUTING_REG,
+		       SOFEOP_TO_HPI_EN(sie->sie_num));
+}
+
+/* -------------------------------------------------------------------------- */
+/* Transactions */
+
+static inline int ll_recv_msg(struct c67x00_device *dev)
+{
+	u16 res;
+
+	res = wait_for_completion_timeout(&dev->hpi.lcp.msg_received, 5 * HZ);
+	WARN_ON(!res);
+
+	return (res == 0) ? -EIO : 0;
+}
+
+/* -------------------------------------------------------------------------- */
+/* General functions */
+
+u16 c67x00_ll_fetch_siemsg(struct c67x00_device *dev, int sie_num)
+{
+	u16 val;
+
+	val = hpi_read_word(dev, SIEMSG_REG(sie_num));
+	/* clear register to allow next message */
+	hpi_write_word(dev, SIEMSG_REG(sie_num), 0);
+
+	return val;
+}
+
+u16 c67x00_ll_get_usb_ctl(struct c67x00_sie *sie)
+{
+	return hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num));
+}
+
+/**
+ * c67x00_ll_usb_clear_status - clear the USB status bits
+ */
+void c67x00_ll_usb_clear_status(struct c67x00_sie *sie, u16 bits)
+{
+	hpi_write_word(sie->dev, USB_STAT_REG(sie->sie_num), bits);
+}
+
+u16 c67x00_ll_usb_get_status(struct c67x00_sie *sie)
+{
+	return hpi_read_word(sie->dev, USB_STAT_REG(sie->sie_num));
+}
+
+/* -------------------------------------------------------------------------- */
+
+static int c67x00_comm_exec_int(struct c67x00_device *dev, u16 nr,
+				struct c67x00_lcp_int_data *data)
+{
+	int i, rc;
+
+	mutex_lock(&dev->hpi.lcp.mutex);
+	hpi_write_word(dev, COMM_INT_NUM, nr);
+	for (i = 0; i < COMM_REGS; i++)
+		hpi_write_word(dev, COMM_R(i), data->regs[i]);
+	hpi_send_mbox(dev, COMM_EXEC_INT);
+	rc = ll_recv_msg(dev);
+	mutex_unlock(&dev->hpi.lcp.mutex);
+
+	return rc;
+}
+
+/* -------------------------------------------------------------------------- */
+/* Host specific functions */
+
+void c67x00_ll_set_husb_eot(struct c67x00_device *dev, u16 value)
+{
+	mutex_lock(&dev->hpi.lcp.mutex);
+	hpi_write_word(dev, HUSB_pEOT, value);
+	mutex_unlock(&dev->hpi.lcp.mutex);
+}
+
+static inline void c67x00_ll_husb_sie_init(struct c67x00_sie *sie)
+{
+	struct c67x00_device *dev = sie->dev;
+	struct c67x00_lcp_int_data data;
+	int rc;
+
+	rc = c67x00_comm_exec_int(dev, HUSB_SIE_INIT_INT(sie->sie_num), &data);
+	BUG_ON(rc); /* No return path for error code; crash spectacularly */
+}
+
+void c67x00_ll_husb_reset(struct c67x00_sie *sie, int port)
+{
+	struct c67x00_device *dev = sie->dev;
+	struct c67x00_lcp_int_data data;
+	int rc;
+
+	data.regs[0] = 50;	/* Reset USB port for 50ms */
+	data.regs[1] = port | (sie->sie_num << 1);
+	rc = c67x00_comm_exec_int(dev, HUSB_RESET_INT, &data);
+	BUG_ON(rc); /* No return path for error code; crash spectacularly */
+}
+
+void c67x00_ll_husb_set_current_td(struct c67x00_sie *sie, u16 addr)
+{
+	hpi_write_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num), addr);
+}
+
+u16 c67x00_ll_husb_get_current_td(struct c67x00_sie *sie)
+{
+	return hpi_read_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num));
+}
+
+u16 c67x00_ll_husb_get_frame(struct c67x00_sie *sie)
+{
+	return hpi_read_word(sie->dev, HOST_FRAME_REG(sie->sie_num));
+}
+
+void c67x00_ll_husb_init_host_port(struct c67x00_sie *sie)
+{
+	/* Set port into host mode */
+	hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), HOST_MODE);
+	c67x00_ll_husb_sie_init(sie);
+	/* Clear interrupts */
+	c67x00_ll_usb_clear_status(sie, HOST_STAT_MASK);
+	/* Check */
+	if (!(hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num)) & HOST_MODE))
+		dev_warn(sie_dev(sie),
+			 "SIE %d not set to host mode\n", sie->sie_num);
+}
+
+void c67x00_ll_husb_reset_port(struct c67x00_sie *sie, int port)
+{
+	/* Clear connect change */
+	c67x00_ll_usb_clear_status(sie, PORT_CONNECT_CHANGE(port));
+
+	/* Enable interrupts */
+	hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
+		     SOFEOP_TO_CPU_EN(sie->sie_num));
+	hpi_set_bits(sie->dev, HOST_IRQ_EN_REG(sie->sie_num),
+		     SOF_EOP_IRQ_EN | DONE_IRQ_EN);
+
+	/* Enable pull down transistors */
+	hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), PORT_RES_EN(port));
+}
+
+/* -------------------------------------------------------------------------- */
+
+void c67x00_ll_irq(struct c67x00_device *dev, u16 int_status)
+{
+	if ((int_status & MBX_OUT_FLG) == 0)
+		return;
+
+	dev->hpi.lcp.last_msg = hpi_recv_mbox(dev);
+	complete(&dev->hpi.lcp.msg_received);
+}
+
+/* -------------------------------------------------------------------------- */
+
+int c67x00_ll_reset(struct c67x00_device *dev)
+{
+	int rc;
+
+	mutex_lock(&dev->hpi.lcp.mutex);
+	hpi_send_mbox(dev, COMM_RESET);
+	rc = ll_recv_msg(dev);
+	mutex_unlock(&dev->hpi.lcp.mutex);
+
+	return rc;
+}
+
+/* -------------------------------------------------------------------------- */
+
+/**
+ * c67x00_ll_write_mem_le16 - write into c67x00 memory
+ * Only data is little endian, addr has cpu endianess.
+ */
+void c67x00_ll_write_mem_le16(struct c67x00_device *dev, u16 addr,
+			      void *data, int len)
+{
+	u8 *buf = data;
+
+	/* Sanity check */
+	if (addr + len > 0xffff) {
+		dev_err(&dev->pdev->dev,
+			"Trying to write beyond writable region!\n");
+		return;
+	}
+
+	if (addr & 0x01) {
+		/* unaligned access */
+		u16 tmp;
+		tmp = hpi_read_word(dev, addr - 1);
+		tmp = (tmp & 0x00ff) | (*buf++ << 8);
+		hpi_write_word(dev, addr - 1, tmp);
+		addr++;
+		len--;
+	}
+
+	hpi_write_words_le16(dev, addr, (__le16 *)buf, len / 2);
+	buf += len & ~0x01;
+	addr += len & ~0x01;
+	len &= 0x01;
+
+	if (len) {
+		u16 tmp;
+		tmp = hpi_read_word(dev, addr);
+		tmp = (tmp & 0xff00) | *buf;
+		hpi_write_word(dev, addr, tmp);
+	}
+}
+
+/**
+ * c67x00_ll_read_mem_le16 - read from c67x00 memory
+ * Only data is little endian, addr has cpu endianess.
+ */
+void c67x00_ll_read_mem_le16(struct c67x00_device *dev, u16 addr,
+			     void *data, int len)
+{
+	u8 *buf = data;
+
+	if (addr & 0x01) {
+		/* unaligned access */
+		u16 tmp;
+		tmp = hpi_read_word(dev, addr - 1);
+		*buf++ = (tmp >> 8) & 0x00ff;
+		addr++;
+		len--;
+	}
+
+	hpi_read_words_le16(dev, addr, (__le16 *)buf, len / 2);
+	buf += len & ~0x01;
+	addr += len & ~0x01;
+	len &= 0x01;
+
+	if (len) {
+		u16 tmp;
+		tmp = hpi_read_word(dev, addr);
+		*buf = tmp & 0x00ff;
+	}
+}
+
+/* -------------------------------------------------------------------------- */
+
+void c67x00_ll_init(struct c67x00_device *dev)
+{
+	mutex_init(&dev->hpi.lcp.mutex);
+	init_completion(&dev->hpi.lcp.msg_received);
+}
+
+void c67x00_ll_release(struct c67x00_device *dev)
+{
+}