Re: [PATCH V4 1/4] i2c: busses: add SLIMpro I2C device driver on APM X-Gene platform

[Feng Kan]

Sorry, please disregard this series. Made a mistake here, will fix and resend.

On Fri, Apr 24, 2015 at 10:11 AM, Feng Kan <fkan@xxxxxxx> wrote:
> Add SLIMpro I2C device driver on APM X-Gene platform. This I2C
> device driver use the SLIMpro Mailbox driver to tunnel message to
> the SLIMpro coprocessor to do the work of accessing I2C components.
>
> Signed-off-by: Feng Kan <fkan@xxxxxxx>
> Signed-off-by: Hieu Le <hnle@xxxxxxx>
> ---
>  drivers/i2c/busses/Kconfig             |   9 +
>  drivers/i2c/busses/Makefile            |   1 +
>  drivers/i2c/busses/i2c-xgene-slimpro.c | 459 +++++++++++++++++++++++++++++++++
>  3 files changed, 469 insertions(+)
>  create mode 100644 drivers/i2c/busses/i2c-xgene-slimpro.c
>
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 22da9c2..1ac07d0 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -1082,6 +1082,15 @@ config I2C_CROS_EC_TUNNEL
>           connected there. This will work whatever the interface used to
>           talk to the EC (SPI, I2C or LPC).
>
> +config I2C_XGENE_SLIMPRO
> +       tristate "APM X-Gene SoC I2C SLIMpro devices support"
> +       depends on ARCH_XGENE && MAILBOX
> +       help
> +         Enable I2C bus access using the APM X-Gene SoC SLIMpro
> +         co-processor. The I2C device access the I2C bus via the X-Gene
> +         to SLIMpro (On chip coprocessor) mailbox mechanism.
> +         If unsure, say N.
> +
>  config SCx200_ACB
>         tristate "Geode ACCESS.bus support"
>         depends on X86_32 && PCI
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 3638feb..9cf9c4b 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -107,6 +107,7 @@ obj-$(CONFIG_I2C_ELEKTOR)   += i2c-elektor.o
>  obj-$(CONFIG_I2C_OPAL)         += i2c-opal.o
>  obj-$(CONFIG_I2C_PCA_ISA)      += i2c-pca-isa.o
>  obj-$(CONFIG_I2C_SIBYTE)       += i2c-sibyte.o
> +obj-$(CONFIG_I2C_XGENE_SLIMPRO) += i2c-xgene-slimpro.o
>  obj-$(CONFIG_SCx200_ACB)       += scx200_acb.o
>
>  ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG
> diff --git a/drivers/i2c/busses/i2c-xgene-slimpro.c b/drivers/i2c/busses/i2c-xgene-slimpro.c
> new file mode 100644
> index 0000000..afe4cf2
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-xgene-slimpro.c
> @@ -0,0 +1,459 @@
> +/*
> + * X-Gene SLIMpro I2C Driver
> + *
> + * Copyright (c) 2014, Applied Micro Circuits Corporation
> + * Author: Feng Kan <fkan@xxxxxxx>
> + * Author: Hieu Le <hnle@xxxxxxx>
> + *
> + * 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/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];
> +       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);
> +       rc = dma_mapping_error(ctx->dev, paddr);
> +       if (rc) {
> +               dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
> +                       ctx->dma_buffer);
> +               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);
> +       rc = dma_mapping_error(ctx->dev, paddr);
> +       if (rc) {
> +               dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
> +                       ctx->dma_buffer);
> +               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_READ) {
> +                       ret = slimpro_i2c_rd(ctx, addr, 0, 0,
> +                                            SLIMPRO_IIC_SMB_PROTOCOL,
> +                                            BYTE_DATA, &val);
> +                       data->byte = val;
> +               } else {
> +                       ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
> +                                            SLIMPRO_IIC_SMB_PROTOCOL,
> +                                            0, 0);
> +               }
> +               break;
> +       case I2C_SMBUS_BYTE_DATA:
> +               if (read_write == I2C_SMBUS_READ) {
> +                       ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
> +                                            SLIMPRO_IIC_SMB_PROTOCOL,
> +                                            BYTE_DATA, &val);
> +                       data->byte = val;
> +               } else {
> +                       val = data->byte;
> +                       ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
> +                                            SLIMPRO_IIC_SMB_PROTOCOL,
> +                                            BYTE_DATA, val);
> +               }
> +               break;
> +       case I2C_SMBUS_WORD_DATA:
> +               if (read_write == I2C_SMBUS_READ) {
> +                       ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
> +                                            SLIMPRO_IIC_SMB_PROTOCOL,
> +                                            WORD_DATA, &val);
> +                       data->word = val;
> +               } else {
> +                       val = data->word;
> +                       ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
> +                                            SLIMPRO_IIC_SMB_PROTOCOL,
> +                                            WORD_DATA, val);
> +               }
> +               break;
> +       case I2C_SMBUS_BLOCK_DATA:
> +               if (read_write == I2C_SMBUS_READ) {
> +                       ret = slimpro_i2c_blkrd(ctx, addr, command,
> +                                               SMBUS_CMD_LEN,
> +                                               SLIMPRO_IIC_SMB_PROTOCOL,
> +                                               I2C_SMBUS_BLOCK_MAX + 1,
> +                                               IIC_SMB_WITH_DATA_LEN,
> +                                               &data->block[0]);
> +
> +               } else {
> +                       ret = slimpro_i2c_blkwr(ctx, addr, command,
> +                                               SMBUS_CMD_LEN,
> +                                               SLIMPRO_IIC_SMB_PROTOCOL,
> +                                               data->block[0] + 1,
> +                                               &data->block[0]);
> +               }
> +               break;
> +       case I2C_SMBUS_I2C_BLOCK_DATA:
> +               if (read_write == I2C_SMBUS_READ) {
> +                       ret = slimpro_i2c_blkrd(ctx, addr,
> +                                               command,
> +                                               SMBUS_CMD_LEN,
> +                                               SLIMPRO_IIC_I2C_PROTOCOL,
> +                                               I2C_SMBUS_BLOCK_MAX,
> +                                               IIC_SMB_WITHOUT_DATA_LEN,
> +                                               &data->block[1]);
> +               } else {
> +                       ret = slimpro_i2c_blkwr(ctx, addr, command,
> +                                               SMBUS_CMD_LEN,
> +                                               SLIMPRO_IIC_I2C_PROTOCOL,
> +                                               data->block[0],
> +                                               &data->block[1]);
> +               }
> +               break;
> +       default:
> +               break;
> +       }
> +       return ret;
> +}
> +
> +/*
> +* Return list of supported functionality.
> +*/
> +static u32 xgene_slimpro_i2c_func(struct i2c_adapter *adapter)
> +{
> +       return I2C_FUNC_SMBUS_BYTE |
> +               I2C_FUNC_SMBUS_BYTE_DATA |
> +               I2C_FUNC_SMBUS_WORD_DATA |
> +               I2C_FUNC_SMBUS_BLOCK_DATA |
> +               I2C_FUNC_SMBUS_I2C_BLOCK;
> +}
> +
> +static struct i2c_algorithm xgene_slimpro_i2c_algorithm = {
> +       .smbus_xfer = xgene_slimpro_i2c_xfer,
> +       .functionality = xgene_slimpro_i2c_func,
> +};
> +
> +static int __init xgene_slimpro_i2c_probe(struct platform_device *pdev)
> +{
> +       struct slimpro_i2c_dev *ctx;
> +       struct i2c_adapter *adapter;
> +       struct mbox_client *cl;
> +       int rc;
> +
> +       ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
> +       if (!ctx)
> +               return -ENOMEM;
> +
> +       ctx->dev = &pdev->dev;
> +       platform_set_drvdata(pdev, ctx);
> +       cl = &ctx->mbox_client;
> +
> +       /* Request mailbox channel */
> +       cl->dev = &pdev->dev;
> +       cl->rx_callback = slimpro_i2c_rx_cb;
> +       cl->tx_block = true;
> +       init_completion(&ctx->rd_complete);
> +       cl->tx_tout = MAILBOX_OP_TIMEOUT;
> +       cl->knows_txdone = false;
> +       ctx->mbox_chan = mbox_request_channel(cl, MAILBOX_I2C_INDEX);
> +       if (IS_ERR(ctx->mbox_chan)) {
> +               dev_err(&pdev->dev, "i2c mailbox channel request failed\n");
> +               return PTR_ERR(ctx->mbox_chan);
> +       }
> +
> +       rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> +       if (rc)
> +               dev_warn(&pdev->dev, "Unable to set dma mask\n");
> +
> +       /* Setup I2C adapter */
> +       adapter = &ctx->adapter;
> +       snprintf(adapter->name, sizeof(adapter->name), "MAILBOX I2C");
> +       adapter->algo = &xgene_slimpro_i2c_algorithm;
> +       adapter->class = I2C_CLASS_HWMON;
> +       adapter->dev.parent = &pdev->dev;
> +       i2c_set_adapdata(adapter, ctx);
> +       rc = i2c_add_adapter(adapter);
> +       if (rc) {
> +               dev_err(&pdev->dev, "Adapter registeration failed\n");
> +               return rc;
> +       }
> +
> +       dev_info(&pdev->dev, "Mailbox I2C Adapter registered\n");
> +       return 0;
> +}
> +
> +static int xgene_slimpro_i2c_remove(struct platform_device *pdev)
> +{
> +       struct slimpro_i2c_dev *ctx = platform_get_drvdata(pdev);
> +
> +       i2c_del_adapter(&ctx->adapter);
> +
> +       mbox_free_channel(ctx->mbox_chan);
> +
> +       return 0;
> +}
> +
> +static const struct of_device_id xgene_slimpro_i2c_id[] = {
> +       {.compatible = "apm,xgene-slimpro-i2c" },
> +       {},
> +};
> +MODULE_DEVICE_TABLE(of, xgene_slimpro_i2c_dt_ids);
> +
> +static struct platform_driver xgene_slimpro_i2c_driver = {
> +       .probe  = xgene_slimpro_i2c_probe,
> +       .remove = xgene_slimpro_i2c_remove,
> +       .driver = {
> +               .name   = "xgene-slimpro-i2c",
> +               .of_match_table = of_match_ptr(xgene_slimpro_i2c_id)
> +       },
> +};
> +
> +module_platform_driver(xgene_slimpro_i2c_driver);
> +
> +MODULE_DESCRIPTION("APM X-Gene SLIMpro I2C driver");
> +MODULE_AUTHOR("Feng Kan <fkan@xxxxxxx>");
> +MODULE_AUTHOR("Hieu Le <hnle@xxxxxxx>");
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
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