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Message-ID: <CAL85gmAxW_AbdvYJBn3q1qrHGH45h8Qef+cZ14M82Lbzq0Wehg@mail.gmail.com>
Date: Fri, 24 Apr 2015 11:13:27 -0700
From: Feng Kan <fkan@....com>
To: patches <patches@....com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
linux-i2c@...r.kernel.org
Cc: Feng Kan <fkan@....com>, Hieu Le <hnle@....com>
Subject: Re: [PATCH V4 1/4] i2c: busses: add SLIMpro I2C device driver on APM
X-Gene platform
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@....com> 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@....com>
> Signed-off-by: Hieu Le <hnle@....com>
> ---
> 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@....com>
> + * Author: Hieu Le <hnle@....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/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@....com>");
> +MODULE_AUTHOR("Hieu Le <hnle@....com>");
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
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