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|
/*
* X-Gene SLIMpro I2C Driver
*
* Copyright (c) 2014, Applied Micro Circuits Corporation
* Author: Feng Kan <fkan@apm.com>
* Author: Hieu Le <hnle@apm.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
* This driver provides support for X-Gene SLIMpro I2C device access
* using the APM X-Gene SLIMpro mailbox driver.
*
*/
#include <linux/acpi.h>
#include <linux/dma-mapping.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/version.h>
#define MAILBOX_OP_TIMEOUT 1000 /* Operation time out in ms */
#define MAILBOX_I2C_INDEX 0
#define SLIMPRO_IIC_BUS 1 /* Use I2C bus 1 only */
#define SMBUS_CMD_LEN 1
#define BYTE_DATA 1
#define WORD_DATA 2
#define BLOCK_DATA 3
#define SLIMPRO_IIC_I2C_PROTOCOL 0
#define SLIMPRO_IIC_SMB_PROTOCOL 1
#define SLIMPRO_IIC_READ 0
#define SLIMPRO_IIC_WRITE 1
#define IIC_SMB_WITHOUT_DATA_LEN 0
#define IIC_SMB_WITH_DATA_LEN 1
#define SLIMPRO_DEBUG_MSG 0
#define SLIMPRO_MSG_TYPE_SHIFT 28
#define SLIMPRO_DBG_SUBTYPE_I2C1READ 4
#define SLIMPRO_DBGMSG_TYPE_SHIFT 24
#define SLIMPRO_DBGMSG_TYPE_MASK 0x0F000000U
#define SLIMPRO_IIC_DEV_SHIFT 23
#define SLIMPRO_IIC_DEV_MASK 0x00800000U
#define SLIMPRO_IIC_DEVID_SHIFT 13
#define SLIMPRO_IIC_DEVID_MASK 0x007FE000U
#define SLIMPRO_IIC_RW_SHIFT 12
#define SLIMPRO_IIC_RW_MASK 0x00001000U
#define SLIMPRO_IIC_PROTO_SHIFT 11
#define SLIMPRO_IIC_PROTO_MASK 0x00000800U
#define SLIMPRO_IIC_ADDRLEN_SHIFT 8
#define SLIMPRO_IIC_ADDRLEN_MASK 0x00000700U
#define SLIMPRO_IIC_DATALEN_SHIFT 0
#define SLIMPRO_IIC_DATALEN_MASK 0x000000FFU
/*
* SLIMpro I2C message encode
*
* dev - Controller number (0-based)
* chip - I2C chip address
* op - SLIMPRO_IIC_READ or SLIMPRO_IIC_WRITE
* proto - SLIMPRO_IIC_SMB_PROTOCOL or SLIMPRO_IIC_I2C_PROTOCOL
* addrlen - Length of the address field
* datalen - Length of the data field
*/
#define SLIMPRO_IIC_ENCODE_MSG(dev, chip, op, proto, addrlen, datalen) \
((SLIMPRO_DEBUG_MSG << SLIMPRO_MSG_TYPE_SHIFT) | \
((SLIMPRO_DBG_SUBTYPE_I2C1READ << SLIMPRO_DBGMSG_TYPE_SHIFT) & \
SLIMPRO_DBGMSG_TYPE_MASK) | \
((dev << SLIMPRO_IIC_DEV_SHIFT) & SLIMPRO_IIC_DEV_MASK) | \
((chip << SLIMPRO_IIC_DEVID_SHIFT) & SLIMPRO_IIC_DEVID_MASK) | \
((op << SLIMPRO_IIC_RW_SHIFT) & SLIMPRO_IIC_RW_MASK) | \
((proto << SLIMPRO_IIC_PROTO_SHIFT) & SLIMPRO_IIC_PROTO_MASK) | \
((addrlen << SLIMPRO_IIC_ADDRLEN_SHIFT) & SLIMPRO_IIC_ADDRLEN_MASK) | \
((datalen << SLIMPRO_IIC_DATALEN_SHIFT) & SLIMPRO_IIC_DATALEN_MASK))
/*
* Encode for upper address for block data
*/
#define SLIMPRO_IIC_ENCODE_FLAG_BUFADDR 0x80000000
#define SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(a) ((u32) (((a) << 30) \
& 0x40000000))
#define SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(a) ((u32) (((a) >> 12) \
& 0x3FF00000))
#define SLIMPRO_IIC_ENCODE_ADDR(a) ((a) & 0x000FFFFF)
struct slimpro_i2c_dev {
struct i2c_adapter adapter;
struct device *dev;
struct mbox_chan *mbox_chan;
struct mbox_client mbox_client;
struct completion rd_complete;
u8 dma_buffer[I2C_SMBUS_BLOCK_MAX + 1]; /* dma_buffer[0] is used for length */
u32 *resp_msg;
};
#define to_slimpro_i2c_dev(cl) \
container_of(cl, struct slimpro_i2c_dev, mbox_client)
static void slimpro_i2c_rx_cb(struct mbox_client *cl, void *mssg)
{
struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
/*
* Response message format:
* mssg[0] is the return code of the operation
* mssg[1] is the first data word
* mssg[2] is NOT used
*/
if (ctx->resp_msg)
*ctx->resp_msg = ((u32 *)mssg)[1];
if (ctx->mbox_client.tx_block)
complete(&ctx->rd_complete);
}
static int start_i2c_msg_xfer(struct slimpro_i2c_dev *ctx)
{
if (ctx->mbox_client.tx_block) {
if (!wait_for_completion_timeout(&ctx->rd_complete,
msecs_to_jiffies(MAILBOX_OP_TIMEOUT)))
return -ETIMEDOUT;
}
/* Check of invalid data or no device */
if (*ctx->resp_msg == 0xffffffff)
return -ENODEV;
return 0;
}
static int slimpro_i2c_rd(struct slimpro_i2c_dev *ctx, u32 chip,
u32 addr, u32 addrlen, u32 protocol,
u32 readlen, u32 *data)
{
u32 msg[3];
int rc;
msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
SLIMPRO_IIC_READ, protocol, addrlen, readlen);
msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
msg[2] = 0;
ctx->resp_msg = data;
rc = mbox_send_message(ctx->mbox_chan, &msg);
if (rc < 0)
goto err;
rc = start_i2c_msg_xfer(ctx);
err:
ctx->resp_msg = NULL;
return rc;
}
static int slimpro_i2c_wr(struct slimpro_i2c_dev *ctx, u32 chip,
u32 addr, u32 addrlen, u32 protocol, u32 writelen,
u32 data)
{
u32 msg[3];
int rc;
msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
SLIMPRO_IIC_WRITE, protocol, addrlen, writelen);
msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
msg[2] = data;
ctx->resp_msg = msg;
rc = mbox_send_message(ctx->mbox_chan, &msg);
if (rc < 0)
goto err;
rc = start_i2c_msg_xfer(ctx);
err:
ctx->resp_msg = NULL;
return rc;
}
static int slimpro_i2c_blkrd(struct slimpro_i2c_dev *ctx, u32 chip, u32 addr,
u32 addrlen, u32 protocol, u32 readlen,
u32 with_data_len, void *data)
{
dma_addr_t paddr;
u32 msg[3];
int rc;
paddr = dma_map_single(ctx->dev, ctx->dma_buffer, readlen, DMA_FROM_DEVICE);
if (dma_mapping_error(ctx->dev, paddr)) {
dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
ctx->dma_buffer);
rc = -ENOMEM;
goto err;
}
msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_READ,
protocol, addrlen, readlen);
msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(with_data_len) |
SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
SLIMPRO_IIC_ENCODE_ADDR(addr);
msg[2] = (u32)paddr;
ctx->resp_msg = msg;
rc = mbox_send_message(ctx->mbox_chan, &msg);
if (rc < 0)
goto err_unmap;
rc = start_i2c_msg_xfer(ctx);
/* Copy to destination */
memcpy(data, ctx->dma_buffer, readlen);
err_unmap:
dma_unmap_single(ctx->dev, paddr, readlen, DMA_FROM_DEVICE);
err:
ctx->resp_msg = NULL;
return rc;
}
static int slimpro_i2c_blkwr(struct slimpro_i2c_dev *ctx, u32 chip,
u32 addr, u32 addrlen, u32 protocol, u32 writelen,
void *data)
{
dma_addr_t paddr;
u32 msg[3];
int rc;
memcpy(ctx->dma_buffer, data, writelen);
paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen,
DMA_TO_DEVICE);
if (dma_mapping_error(ctx->dev, paddr)) {
dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
ctx->dma_buffer);
rc = -ENOMEM;
goto err;
}
msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_WRITE,
protocol, addrlen, writelen);
msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
SLIMPRO_IIC_ENCODE_ADDR(addr);
msg[2] = (u32)paddr;
ctx->resp_msg = msg;
if (ctx->mbox_client.tx_block)
reinit_completion(&ctx->rd_complete);
rc = mbox_send_message(ctx->mbox_chan, &msg);
if (rc < 0)
goto err_unmap;
rc = start_i2c_msg_xfer(ctx);
err_unmap:
dma_unmap_single(ctx->dev, paddr, writelen, DMA_TO_DEVICE);
err:
ctx->resp_msg = NULL;
return rc;
}
static int xgene_slimpro_i2c_xfer(struct i2c_adapter *adap, u16 addr,
unsigned short flags, char read_write,
u8 command, int size,
union i2c_smbus_data *data)
{
struct slimpro_i2c_dev *ctx = i2c_get_adapdata(adap);
int ret = -EOPNOTSUPP;
u32 val;
switch (size) {
case I2C_SMBUS_BYTE:
if (read_write == I2C_SMBUS_
|