[U-Boot] [PATCH v3 3/3] misc: Add gdsys_ioep driver
Mario Six
mario.six at gdsys.cc
Wed May 23 14:07:34 UTC 2018
Add driver for the IHS IO endpoint on IHS FPGAs.
Signed-off-by: Mario Six <mario.six at gdsys.cc>
---
v2 -> v3:
No changes
v1 -> v2:
* Switched to regmap usage (instead of fpgamap)
---
drivers/misc/Kconfig | 6 ++
drivers/misc/Makefile | 1 +
drivers/misc/gdsys_ioep.c | 155 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/misc/gdsys_ioep.h | 73 ++++++++++++++++++++++
4 files changed, 235 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 be900cf4d6e..dc4cd4ec110 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -268,4 +268,10 @@ config GDSYS_RXAUI_CTRL
depends on MISC
help
Support gdsys FPGA's RXAUI control.
+
+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 e362609d62a..1782dc8be42 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -53,3 +53,4 @@ 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_RXAUI_CTRL) += gdsys_rxaui_ctrl.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 00000000000..2c29e8c4e8c
--- /dev/null
+++ b/drivers/misc/gdsys_ioep.c
@@ -0,0 +1,155 @@
+/*
+ * (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;
+ bool state;
+};
+
+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;
+
+ priv->state = !priv->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 !priv->state;
+}
+
+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_ofnode(dev), &priv->map);
+
+ priv->state = false;
+
+ 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 00000000000..cccf5800919
--- /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_ */
--
2.11.0
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