[U-Boot] [PATCH v2 2/2] misc: Add gdsys_ioep driver

Mario Six mario.six at gdsys.cc
Fri Apr 27 12:52:16 UTC 2018


Add driver for the IHS IO endpoint on IHS FPGAs.

Signed-off-by: Mario Six <mario.six at gdsys.cc>
---

v1 -> v2:
* Switched to regmap usage (instead of fpgamap)

---
 drivers/misc/Kconfig      |   5 ++
 drivers/misc/Makefile     |   1 +
 drivers/misc/gdsys_ioep.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++
 drivers/misc/gdsys_ioep.h |  73 ++++++++++++++++++++++
 4 files changed, 229 insertions(+)
 create mode 100644 drivers/misc/gdsys_ioep.c
 create mode 100644 drivers/misc/gdsys_ioep.h

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index d774569cbc..db688f440d 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -264,4 +264,9 @@ config SYS_I2C_EEPROM_ADDR_OVERFLOW
 endif
 
 
+config GDSYS_IOEP
+	bool "Enable gdsys IOEP driver"
+	depends on MISC
+	help
+	  Support gdsys FPGA's IO endpoint driver.
 endmenu
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index e8d598cd47..0aa1e3fa4b 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -54,3 +54,4 @@ obj-$(CONFIG_QFW) += qfw.o
 obj-$(CONFIG_ROCKCHIP_EFUSE) += rockchip-efuse.o
 obj-$(CONFIG_STM32_RCC) += stm32_rcc.o
 obj-$(CONFIG_SYS_DPAA_QBMAN) += fsl_portals.o
+obj-$(CONFIG_GDSYS_IOEP) += gdsys_ioep.o
diff --git a/drivers/misc/gdsys_ioep.c b/drivers/misc/gdsys_ioep.c
new file mode 100644
index 0000000000..552c1872c8
--- /dev/null
+++ b/drivers/misc/gdsys_ioep.c
@@ -0,0 +1,150 @@
+/*
+ * (C) Copyright 2017
+ * Mario Six,  Guntermann & Drunck GmbH, mario.six at gdsys.cc
+ *
+ * based on the cmd_ioloop driver/command, which is
+ *
+ * (C) Copyright 2014
+ * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach at gdsys.cc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <misc.h>
+#include <regmap.h>
+
+#include "gdsys_ioep.h"
+
+struct gdsys_ioep_priv {
+	struct regmap *map;
+};
+
+enum last_spec {
+	READ_DATA_IS_LAST,
+	READ_DATA_IS_NOT_LAST,
+};
+
+int gdsys_ioep_set_receive(struct udevice *dev, bool val)
+{
+	struct gdsys_ioep_priv *priv = dev_get_priv(dev);
+	u16 state;
+
+	if (val)
+		state = CTRL_PROC_RECEIVE_ENABLE;
+	else
+		state = ~CTRL_PROC_RECEIVE_ENABLE;
+
+	gdsys_ioep_set(priv->map, tx_control, state);
+
+	if (val) {
+		/* Set device address to dummy 1*/
+		gdsys_ioep_set(priv->map, device_address, 1);
+	}
+
+	return 0;
+}
+
+int gdsys_ioep_send(struct udevice *dev, int offset, const void *buf, int size)
+{
+	struct gdsys_ioep_priv *priv = dev_get_priv(dev);
+	int k;
+	u16 *p = (u16 *)buf;
+
+	for (k = 0; k < size; ++k)
+		gdsys_ioep_set(priv->map, transmit_data, *(p++));
+
+	gdsys_ioep_set(priv->map, tx_control, CTRL_PROC_RECEIVE_ENABLE |
+					      CTRL_FLUSH_TRANSMIT_BUFFER);
+
+	return 0;
+}
+
+int receive_byte_buffer(struct udevice *dev, uint len, u16 *buffer, enum last_spec last_spec)
+{
+	struct gdsys_ioep_priv *priv = dev_get_priv(dev);
+	int k;
+	int res = -EIO;
+
+	for (k = 0; k < len; ++k) {
+		u16 rx_tx_status;
+
+		gdsys_ioep_get(priv->map, receive_data, buffer++);
+
+		gdsys_ioep_get(priv->map, rx_tx_status, &rx_tx_status);
+		if (k == (len - 1) && (last_spec == READ_DATA_IS_NOT_LAST ||
+				       rx_tx_status & STATE_RX_DATA_LAST))
+			res = 0;
+	}
+
+	return res;
+}
+
+int gdsys_ioep_receive(struct udevice *dev, int offset, void *buf, int size)
+{
+	int res1, res2;
+	struct io_generic_packet header;
+	u16 *p = (u16 *)buf;
+	const int header_words = sizeof(struct io_generic_packet) / 2;
+	uint len;
+
+	res1 = receive_byte_buffer(dev, header_words, p, READ_DATA_IS_NOT_LAST);
+	memcpy(&header, p, 2 * header_words);
+	p += header_words;
+
+	len = (header.packet_length + 1) / 2;
+
+	if (!res1)
+		res2 = receive_byte_buffer(dev, len, p, READ_DATA_IS_LAST);
+
+	return res1 ? res1 : res2;
+}
+
+int gdsys_ioep_get_and_reset_status(struct udevice *dev, int msgid,
+				    void *tx_msg, int tx_size, void *rx_msg,
+				    int rx_size)
+{
+	struct gdsys_ioep_priv *priv = dev_get_priv(dev);
+	const u16 mask = STATE_RX_DIST_ERR | STATE_RX_LENGTH_ERR |
+			 STATE_RX_FRAME_CTR_ERR | STATE_RX_FCS_ERR |
+			 STATE_RX_PACKET_DROPPED | STATE_TX_ERR;
+	u16 *status = rx_msg;
+
+	gdsys_ioep_get(priv->map, rx_tx_status, status);
+
+	gdsys_ioep_set(priv->map, rx_tx_status, *status);
+
+	return (*status & mask) ? 1 : 0;
+}
+
+static const struct misc_ops gdsys_ioep_ops = {
+	.set_enabled = gdsys_ioep_set_receive,
+	.write = gdsys_ioep_send,
+	.read = gdsys_ioep_receive,
+	.call = gdsys_ioep_get_and_reset_status,
+};
+
+int gdsys_ioep_probe(struct udevice *dev)
+{
+	struct gdsys_ioep_priv *priv = dev_get_priv(dev);
+
+	regmap_init_mem(dev, &priv->map);
+
+	return 0;
+}
+
+static const struct udevice_id gdsys_ioep_ids[] = {
+	{ .compatible = "gdsys,io-endpoint" },
+	{ }
+};
+
+U_BOOT_DRIVER(gdsys_ioep) = {
+	.name           = "gdsys_ioep",
+	.id             = UCLASS_MISC,
+	.ops		= &gdsys_ioep_ops,
+	.flags		= DM_UC_FLAG_SEQ_ALIAS,
+	.of_match       = gdsys_ioep_ids,
+	.probe          = gdsys_ioep_probe,
+	.priv_auto_alloc_size = sizeof(struct gdsys_ioep_priv),
+};
diff --git a/drivers/misc/gdsys_ioep.h b/drivers/misc/gdsys_ioep.h
new file mode 100644
index 0000000000..cccf580091
--- /dev/null
+++ b/drivers/misc/gdsys_ioep.h
@@ -0,0 +1,73 @@
+/*
+ * (C) Copyright 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six at gdsys.cc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __GDSYS_IOEP_H_
+#define __GDSYS_IOEP_H_
+
+/**
+ * struct io_generic_packet - header structure for GDSYS IOEP packets
+ *
+ * @target_address:     Target protocol address of the packet.
+ * @source_address:     Source protocol address of the packet.
+ * @packet_type:        Packet type.
+ * @bc:                 Block counter (filled in by FPGA).
+ * @packet_length:      Length of the packet's payload bytes.
+ */
+struct io_generic_packet {
+        u16 target_address;
+        u16 source_address;
+        u8 packet_type;
+        u8 bc;
+        u16 packet_length;
+} __attribute__((__packed__));
+
+struct gdsys_ioep_regs {
+	u16 transmit_data;
+	u16 tx_control;
+	u16 receive_data;
+	u16 rx_tx_status;
+	u16 device_address;
+	u16 target_address;
+	u16 int_enable;
+};
+
+#define gdsys_ioep_set(map, member, val) \
+	regmap_set(map, struct gdsys_ioep_regs, member, val)
+
+#define gdsys_ioep_get(map, member, valp) \
+	regmap_get(map, struct gdsys_ioep_regs, member, valp)
+enum {
+	STATE_TX_PACKET_BUILDING = BIT(0),
+	STATE_TX_TRANSMITTING = BIT(1),
+	STATE_TX_BUFFER_FULL = BIT(2),
+	STATE_TX_ERR = BIT(3),
+	STATE_RECEIVE_TIMEOUT = BIT(4),
+	STATE_PROC_RX_STORE_TIMEOUT = BIT(5),
+	STATE_PROC_RX_RECEIVE_TIMEOUT = BIT(6),
+	STATE_RX_DIST_ERR = BIT(7),
+	STATE_RX_LENGTH_ERR = BIT(8),
+	STATE_RX_FRAME_CTR_ERR = BIT(9),
+	STATE_RX_FCS_ERR = BIT(10),
+	STATE_RX_PACKET_DROPPED = BIT(11),
+	STATE_RX_DATA_LAST = BIT(12),
+	STATE_RX_DATA_FIRST = BIT(13),
+	STATE_RX_DATA_AVAILABLE = BIT(15),
+};
+
+enum {
+	CTRL_PROC_RECEIVE_ENABLE = BIT(12),
+	CTRL_FLUSH_TRANSMIT_BUFFER = BIT(15),
+};
+
+enum {
+	IRQ_CPU_TRANSMITBUFFER_FREE_STATUS = BIT(5),
+	IRQ_CPU_PACKET_TRANSMITTED_EVENT = BIT(6),
+	IRQ_NEW_CPU_PACKET_RECEIVED_EVENT = BIT(7),
+	IRQ_CPU_RECEIVE_DATA_AVAILABLE_STATUS = BIT(8),
+};
+
+#endif /* __GDSYS_IOEP_H_ */
-- 
2.16.1



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