1 files changed, 152 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-tegra-hv-common.h b/drivers/i2c/busses/i2c-tegra-hv-common.h
new file mode 100644
index 000000000..b41f822c1
--- /dev/null
+++ b/drivers/i2c/busses/i2c-tegra-hv-common.h
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2015, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef __I2C_LIB_HV_H__
+#define __I2C_LIB_HV_H__
+
+#ifdef CONFIG_TEGRA_HV_MANAGER
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/tegra-ivc.h>
+#include <linux/list.h>
+#include <linux/workqueue.h>
+
+typedef void (*i2c_isr_handler)(void *context);
+
+struct tegra_hv_i2c_comm_chan;
+
+int hv_i2c_transfer(struct tegra_hv_i2c_comm_chan *comm_chan, int cont_id,
+                int addr, int read, uint8_t *buf, size_t len, int *err,
+                int seq_no, bool more_msgs);
+int hv_i2c_get_max_payload(struct tegra_hv_i2c_comm_chan *comm_chan,
+                int cont_id, uint32_t *max_payload, int *err);
+int hv_i2c_comm_chan_cleanup(struct tegra_hv_i2c_comm_chan *comm_chan,
+                int cont_id);
+void hv_i2c_comm_chan_free(struct tegra_hv_i2c_comm_chan *comm_chan);
+void *hv_i2c_comm_init(struct device *dev, i2c_isr_handler handler,
+                void *data);
+
+#define MAX_COMM_CHANS  7
+#define COMM_CHAN_UNASSIGNED    MAX_COMM_CHANS
+
+enum i2c_ivc_msg_t {
+        I2C_READ,
+        I2C_READ_RESPONSE,
+        I2C_WRITE,
+        I2C_WRITE_RESPONSE,
+        I2C_GET_MAX_PAYLOAD,
+        I2C_GET_MAX_PAYLOAD_RESPONSE,
+        I2C_CLEANUP,
+        I2C_CLEANUP_RESPONSE,
+        I2C_INVALID,
+};
+
+enum i2c_rx_state_t {
+        I2C_RX_INIT,
+        I2C_RX_PENDING,
+        I2C_RX_PENDING_CLEANUP,
+};
+
+#define HV_I2C_FLAGS_REPEAT_START       (1<<0)
+
+struct i2c_ivc_msg_common {
+        uint32_t s_marker;
+        uint32_t msg_type;
+        int32_t comm_chan_id;
+        uint32_t controller_instance;
+        uint32_t err;
+        uint32_t e_marker;
+};
+
+struct i2c_ivc_msg_tx_rx_hdr {
+        int32_t seq_no;
+        uint32_t slave_address;
+        uint32_t slave_reg;
+        uint32_t buf_len;
+        uint32_t flags;
+};
+
+struct i2c_ivc_msg_tx_rx {
+        struct i2c_ivc_msg_tx_rx_hdr fixed;
+        uint8_t buffer[4096];
+};
+
+struct i2c_ivc_msg_max_payload {
+        uint32_t max_payload;
+};
+
+struct i2c_ivc_msg {
+        struct i2c_ivc_msg_common hdr;
+        union {
+                struct i2c_ivc_msg_tx_rx m;
+                struct i2c_ivc_msg_max_payload p;
+        } body;
+};
+
+#define I2C_IVC_COMMON_HEADER_LEN       sizeof(struct i2c_ivc_msg_common)
+
+#define i2c_ivc_start_marker(_msg_ptr)  (_msg_ptr->hdr.s_marker)
+#define i2c_ivc_end_marker(_msg_ptr)    (_msg_ptr->hdr.e_marker)
+#define i2c_ivc_chan_id(_msg_ptr)       (_msg_ptr->hdr.comm_chan_id)
+#define i2c_ivc_controller_instance(_msg_ptr)   \
+                                        (_msg_ptr->hdr.controller_instance)
+#define i2c_ivc_msg_type(_msg_ptr)      (_msg_ptr->hdr.msg_type)
+#define i2c_ivc_error_field(_msg_ptr)   (_msg_ptr->hdr.err)
+
+#define i2c_ivc_message_seq_nr(_msg_ptr)        \
+                                        (_msg_ptr->body.m.fixed.seq_no)
+#define i2c_ivc_message_slave_addr(_msg_ptr)    \
+                                        (_msg_ptr->body.m.fixed.slave_address)
+#define i2c_ivc_message_slave_reg(_msg_ptr)     \
+                                        (_msg_ptr->body.m.fixed.slave_reg)
+#define i2c_ivc_message_buf_len(_msg_ptr)       \
+                                        (_msg_ptr->body.m.fixed.buf_len)
+#define i2c_ivc_message_flags(_msg_ptr) (_msg_ptr->body.m.fixed.flags)
+#define i2c_ivc_message_buffer(_msg_ptr)        \
+                                        (_msg_ptr->body.m.buffer[0])
+
+#define i2c_ivc_max_payload_field(_msg_ptr)     \
+                                        (_msg_ptr->body.p.max_payload)
+
+struct tegra_hv_i2c_comm_dev;
+
+/* channel is virtual abstraction over a single ivc queue
+ * each channel holds messages that are independent of other channels
+ * we allocate one channel per i2c adapter as these can operate in parallel
+ */
+struct tegra_hv_i2c_comm_chan {
+        struct tegra_hv_ivc_cookie *ivck;
+        struct device *dev;
+        int id;
+        i2c_isr_handler handler;
+        void *data;
+        void *rcvd_data;
+        size_t data_len;
+        int *rcvd_err;
+        enum i2c_rx_state_t rx_state;
+        struct tegra_hv_i2c_comm_dev *hv_comm_dev;
+        spinlock_t lock;
+};
+
+
+struct tegra_hv_i2c_comm_dev {
+        uint32_t queue_id;
+        struct tegra_hv_ivc_cookie *ivck;
+        spinlock_t ivck_tx_lock;
+        spinlock_t lock;
+        struct hlist_node list;
+        struct work_struct work;
+        struct tegra_hv_i2c_comm_chan *hv_comm_chan[MAX_COMM_CHANS];
+};
+#endif
+#endif