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![Dan Carpenter](/assets/img/avatar_default.png)
The dma_mapping_error() function returns true if there is an error, it doesn't return an error code. We should return -ENOMEM. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org
470 lines
12 KiB
C
470 lines
12 KiB
C
/*
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* X-Gene SLIMpro I2C Driver
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*
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* Copyright (c) 2014, Applied Micro Circuits Corporation
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* Author: Feng Kan <fkan@apm.com>
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* Author: Hieu Le <hnle@apm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* This driver provides support for X-Gene SLIMpro I2C device access
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* using the APM X-Gene SLIMpro mailbox driver.
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*
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*/
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#include <linux/acpi.h>
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#include <linux/dma-mapping.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/mailbox_client.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/version.h>
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#define MAILBOX_OP_TIMEOUT 1000 /* Operation time out in ms */
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#define MAILBOX_I2C_INDEX 0
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#define SLIMPRO_IIC_BUS 1 /* Use I2C bus 1 only */
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#define SMBUS_CMD_LEN 1
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#define BYTE_DATA 1
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#define WORD_DATA 2
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#define BLOCK_DATA 3
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#define SLIMPRO_IIC_I2C_PROTOCOL 0
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#define SLIMPRO_IIC_SMB_PROTOCOL 1
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#define SLIMPRO_IIC_READ 0
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#define SLIMPRO_IIC_WRITE 1
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#define IIC_SMB_WITHOUT_DATA_LEN 0
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#define IIC_SMB_WITH_DATA_LEN 1
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#define SLIMPRO_DEBUG_MSG 0
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#define SLIMPRO_MSG_TYPE_SHIFT 28
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#define SLIMPRO_DBG_SUBTYPE_I2C1READ 4
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#define SLIMPRO_DBGMSG_TYPE_SHIFT 24
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#define SLIMPRO_DBGMSG_TYPE_MASK 0x0F000000U
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#define SLIMPRO_IIC_DEV_SHIFT 23
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#define SLIMPRO_IIC_DEV_MASK 0x00800000U
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#define SLIMPRO_IIC_DEVID_SHIFT 13
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#define SLIMPRO_IIC_DEVID_MASK 0x007FE000U
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#define SLIMPRO_IIC_RW_SHIFT 12
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#define SLIMPRO_IIC_RW_MASK 0x00001000U
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#define SLIMPRO_IIC_PROTO_SHIFT 11
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#define SLIMPRO_IIC_PROTO_MASK 0x00000800U
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#define SLIMPRO_IIC_ADDRLEN_SHIFT 8
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#define SLIMPRO_IIC_ADDRLEN_MASK 0x00000700U
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#define SLIMPRO_IIC_DATALEN_SHIFT 0
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#define SLIMPRO_IIC_DATALEN_MASK 0x000000FFU
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/*
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* SLIMpro I2C message encode
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*
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* dev - Controller number (0-based)
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* chip - I2C chip address
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* op - SLIMPRO_IIC_READ or SLIMPRO_IIC_WRITE
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* proto - SLIMPRO_IIC_SMB_PROTOCOL or SLIMPRO_IIC_I2C_PROTOCOL
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* addrlen - Length of the address field
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* datalen - Length of the data field
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*/
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#define SLIMPRO_IIC_ENCODE_MSG(dev, chip, op, proto, addrlen, datalen) \
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((SLIMPRO_DEBUG_MSG << SLIMPRO_MSG_TYPE_SHIFT) | \
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((SLIMPRO_DBG_SUBTYPE_I2C1READ << SLIMPRO_DBGMSG_TYPE_SHIFT) & \
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SLIMPRO_DBGMSG_TYPE_MASK) | \
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((dev << SLIMPRO_IIC_DEV_SHIFT) & SLIMPRO_IIC_DEV_MASK) | \
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((chip << SLIMPRO_IIC_DEVID_SHIFT) & SLIMPRO_IIC_DEVID_MASK) | \
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((op << SLIMPRO_IIC_RW_SHIFT) & SLIMPRO_IIC_RW_MASK) | \
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((proto << SLIMPRO_IIC_PROTO_SHIFT) & SLIMPRO_IIC_PROTO_MASK) | \
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((addrlen << SLIMPRO_IIC_ADDRLEN_SHIFT) & SLIMPRO_IIC_ADDRLEN_MASK) | \
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((datalen << SLIMPRO_IIC_DATALEN_SHIFT) & SLIMPRO_IIC_DATALEN_MASK))
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/*
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* Encode for upper address for block data
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*/
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#define SLIMPRO_IIC_ENCODE_FLAG_BUFADDR 0x80000000
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#define SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(a) ((u32) (((a) << 30) \
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& 0x40000000))
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#define SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(a) ((u32) (((a) >> 12) \
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& 0x3FF00000))
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#define SLIMPRO_IIC_ENCODE_ADDR(a) ((a) & 0x000FFFFF)
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struct slimpro_i2c_dev {
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struct i2c_adapter adapter;
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struct device *dev;
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struct mbox_chan *mbox_chan;
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struct mbox_client mbox_client;
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struct completion rd_complete;
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u8 dma_buffer[I2C_SMBUS_BLOCK_MAX];
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u32 *resp_msg;
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};
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#define to_slimpro_i2c_dev(cl) \
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container_of(cl, struct slimpro_i2c_dev, mbox_client)
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static void slimpro_i2c_rx_cb(struct mbox_client *cl, void *mssg)
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{
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struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
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/*
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* Response message format:
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* mssg[0] is the return code of the operation
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* mssg[1] is the first data word
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* mssg[2] is NOT used
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*/
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if (ctx->resp_msg)
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*ctx->resp_msg = ((u32 *)mssg)[1];
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if (ctx->mbox_client.tx_block)
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complete(&ctx->rd_complete);
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}
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static int start_i2c_msg_xfer(struct slimpro_i2c_dev *ctx)
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{
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if (ctx->mbox_client.tx_block) {
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if (!wait_for_completion_timeout(&ctx->rd_complete,
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msecs_to_jiffies(MAILBOX_OP_TIMEOUT)))
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return -ETIMEDOUT;
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}
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/* Check of invalid data or no device */
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if (*ctx->resp_msg == 0xffffffff)
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return -ENODEV;
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return 0;
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}
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static int slimpro_i2c_rd(struct slimpro_i2c_dev *ctx, u32 chip,
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u32 addr, u32 addrlen, u32 protocol,
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u32 readlen, u32 *data)
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{
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u32 msg[3];
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int rc;
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msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
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SLIMPRO_IIC_READ, protocol, addrlen, readlen);
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msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
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msg[2] = 0;
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ctx->resp_msg = data;
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rc = mbox_send_message(ctx->mbox_chan, &msg);
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if (rc < 0)
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goto err;
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rc = start_i2c_msg_xfer(ctx);
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err:
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ctx->resp_msg = NULL;
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return rc;
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}
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static int slimpro_i2c_wr(struct slimpro_i2c_dev *ctx, u32 chip,
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u32 addr, u32 addrlen, u32 protocol, u32 writelen,
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u32 data)
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{
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u32 msg[3];
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int rc;
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msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
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SLIMPRO_IIC_WRITE, protocol, addrlen, writelen);
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msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
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msg[2] = data;
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ctx->resp_msg = msg;
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rc = mbox_send_message(ctx->mbox_chan, &msg);
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if (rc < 0)
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goto err;
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rc = start_i2c_msg_xfer(ctx);
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err:
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ctx->resp_msg = NULL;
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return rc;
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}
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static int slimpro_i2c_blkrd(struct slimpro_i2c_dev *ctx, u32 chip, u32 addr,
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u32 addrlen, u32 protocol, u32 readlen,
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u32 with_data_len, void *data)
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{
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dma_addr_t paddr;
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u32 msg[3];
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int rc;
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paddr = dma_map_single(ctx->dev, ctx->dma_buffer, readlen, DMA_FROM_DEVICE);
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if (dma_mapping_error(ctx->dev, paddr)) {
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dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
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ctx->dma_buffer);
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rc = -ENOMEM;
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goto err;
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}
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msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_READ,
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protocol, addrlen, readlen);
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msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
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SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(with_data_len) |
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SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
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SLIMPRO_IIC_ENCODE_ADDR(addr);
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msg[2] = (u32)paddr;
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ctx->resp_msg = msg;
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rc = mbox_send_message(ctx->mbox_chan, &msg);
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if (rc < 0)
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goto err_unmap;
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rc = start_i2c_msg_xfer(ctx);
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/* Copy to destination */
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memcpy(data, ctx->dma_buffer, readlen);
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err_unmap:
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dma_unmap_single(ctx->dev, paddr, readlen, DMA_FROM_DEVICE);
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err:
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ctx->resp_msg = NULL;
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return rc;
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}
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static int slimpro_i2c_blkwr(struct slimpro_i2c_dev *ctx, u32 chip,
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u32 addr, u32 addrlen, u32 protocol, u32 writelen,
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void *data)
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{
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dma_addr_t paddr;
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u32 msg[3];
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int rc;
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memcpy(ctx->dma_buffer, data, writelen);
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paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen,
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DMA_TO_DEVICE);
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if (dma_mapping_error(ctx->dev, paddr)) {
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dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
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ctx->dma_buffer);
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rc = -ENOMEM;
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goto err;
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}
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msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_WRITE,
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protocol, addrlen, writelen);
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msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
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SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
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SLIMPRO_IIC_ENCODE_ADDR(addr);
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msg[2] = (u32)paddr;
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ctx->resp_msg = msg;
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if (ctx->mbox_client.tx_block)
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reinit_completion(&ctx->rd_complete);
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rc = mbox_send_message(ctx->mbox_chan, &msg);
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if (rc < 0)
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goto err_unmap;
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rc = start_i2c_msg_xfer(ctx);
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err_unmap:
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dma_unmap_single(ctx->dev, paddr, writelen, DMA_TO_DEVICE);
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err:
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ctx->resp_msg = NULL;
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return rc;
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}
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static int xgene_slimpro_i2c_xfer(struct i2c_adapter *adap, u16 addr,
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unsigned short flags, char read_write,
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u8 command, int size,
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union i2c_smbus_data *data)
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{
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struct slimpro_i2c_dev *ctx = i2c_get_adapdata(adap);
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int ret = -EOPNOTSUPP;
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u32 val;
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switch (size) {
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case I2C_SMBUS_BYTE:
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if (read_write == I2C_SMBUS_READ) {
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ret = slimpro_i2c_rd(ctx, addr, 0, 0,
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SLIMPRO_IIC_SMB_PROTOCOL,
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BYTE_DATA, &val);
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data->byte = val;
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} else {
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ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
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SLIMPRO_IIC_SMB_PROTOCOL,
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0, 0);
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}
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break;
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case I2C_SMBUS_BYTE_DATA:
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if (read_write == I2C_SMBUS_READ) {
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ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
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SLIMPRO_IIC_SMB_PROTOCOL,
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BYTE_DATA, &val);
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data->byte = val;
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} else {
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val = data->byte;
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ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
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SLIMPRO_IIC_SMB_PROTOCOL,
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BYTE_DATA, val);
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}
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break;
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case I2C_SMBUS_WORD_DATA:
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if (read_write == I2C_SMBUS_READ) {
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ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
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SLIMPRO_IIC_SMB_PROTOCOL,
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WORD_DATA, &val);
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data->word = val;
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} else {
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val = data->word;
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ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
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SLIMPRO_IIC_SMB_PROTOCOL,
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WORD_DATA, val);
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}
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break;
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case I2C_SMBUS_BLOCK_DATA:
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if (read_write == I2C_SMBUS_READ) {
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ret = slimpro_i2c_blkrd(ctx, addr, command,
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SMBUS_CMD_LEN,
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SLIMPRO_IIC_SMB_PROTOCOL,
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I2C_SMBUS_BLOCK_MAX + 1,
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IIC_SMB_WITH_DATA_LEN,
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&data->block[0]);
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} else {
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ret = slimpro_i2c_blkwr(ctx, addr, command,
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SMBUS_CMD_LEN,
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SLIMPRO_IIC_SMB_PROTOCOL,
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data->block[0] + 1,
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&data->block[0]);
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}
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break;
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case I2C_SMBUS_I2C_BLOCK_DATA:
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if (read_write == I2C_SMBUS_READ) {
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ret = slimpro_i2c_blkrd(ctx, addr,
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command,
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SMBUS_CMD_LEN,
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SLIMPRO_IIC_I2C_PROTOCOL,
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I2C_SMBUS_BLOCK_MAX,
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IIC_SMB_WITHOUT_DATA_LEN,
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&data->block[1]);
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} else {
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ret = slimpro_i2c_blkwr(ctx, addr, command,
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SMBUS_CMD_LEN,
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SLIMPRO_IIC_I2C_PROTOCOL,
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data->block[0],
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&data->block[1]);
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}
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break;
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default:
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break;
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}
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return ret;
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}
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/*
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* Return list of supported functionality.
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*/
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static u32 xgene_slimpro_i2c_func(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_WORD_DATA |
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I2C_FUNC_SMBUS_BLOCK_DATA |
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I2C_FUNC_SMBUS_I2C_BLOCK;
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}
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static struct i2c_algorithm xgene_slimpro_i2c_algorithm = {
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.smbus_xfer = xgene_slimpro_i2c_xfer,
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.functionality = xgene_slimpro_i2c_func,
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};
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static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
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{
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struct slimpro_i2c_dev *ctx;
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struct i2c_adapter *adapter;
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struct mbox_client *cl;
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int rc;
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ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->dev = &pdev->dev;
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platform_set_drvdata(pdev, ctx);
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cl = &ctx->mbox_client;
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/* Request mailbox channel */
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cl->dev = &pdev->dev;
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cl->rx_callback = slimpro_i2c_rx_cb;
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cl->tx_block = true;
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init_completion(&ctx->rd_complete);
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cl->tx_tout = MAILBOX_OP_TIMEOUT;
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cl->knows_txdone = false;
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ctx->mbox_chan = mbox_request_channel(cl, MAILBOX_I2C_INDEX);
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if (IS_ERR(ctx->mbox_chan)) {
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dev_err(&pdev->dev, "i2c mailbox channel request failed\n");
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return PTR_ERR(ctx->mbox_chan);
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}
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rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
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if (rc)
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dev_warn(&pdev->dev, "Unable to set dma mask\n");
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/* Setup I2C adapter */
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adapter = &ctx->adapter;
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snprintf(adapter->name, sizeof(adapter->name), "MAILBOX I2C");
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adapter->algo = &xgene_slimpro_i2c_algorithm;
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adapter->class = I2C_CLASS_HWMON;
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adapter->dev.parent = &pdev->dev;
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i2c_set_adapdata(adapter, ctx);
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rc = i2c_add_adapter(adapter);
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if (rc) {
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dev_err(&pdev->dev, "Adapter registeration failed\n");
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mbox_free_channel(ctx->mbox_chan);
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return rc;
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}
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dev_info(&pdev->dev, "Mailbox I2C Adapter registered\n");
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return 0;
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}
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static int xgene_slimpro_i2c_remove(struct platform_device *pdev)
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{
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struct slimpro_i2c_dev *ctx = platform_get_drvdata(pdev);
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i2c_del_adapter(&ctx->adapter);
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mbox_free_channel(ctx->mbox_chan);
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return 0;
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}
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static const struct of_device_id xgene_slimpro_i2c_dt_ids[] = {
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{.compatible = "apm,xgene-slimpro-i2c" },
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{},
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};
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MODULE_DEVICE_TABLE(of, xgene_slimpro_i2c_dt_ids);
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id xgene_slimpro_i2c_acpi_ids[] = {
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{"APMC0D40", 0},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, xgene_slimpro_i2c_acpi_ids);
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#endif
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static struct platform_driver xgene_slimpro_i2c_driver = {
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.probe = xgene_slimpro_i2c_probe,
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.remove = xgene_slimpro_i2c_remove,
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.driver = {
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|
.name = "xgene-slimpro-i2c",
|
|
.of_match_table = of_match_ptr(xgene_slimpro_i2c_dt_ids),
|
|
.acpi_match_table = ACPI_PTR(xgene_slimpro_i2c_acpi_ids)
|
|
},
|
|
};
|
|
|
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module_platform_driver(xgene_slimpro_i2c_driver);
|
|
|
|
MODULE_DESCRIPTION("APM X-Gene SLIMpro I2C driver");
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|
MODULE_AUTHOR("Feng Kan <fkan@apm.com>");
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|
MODULE_AUTHOR("Hieu Le <hnle@apm.com>");
|
|
MODULE_LICENSE("GPL");
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