Hi, I'd like to kindly clarify whether the patch I sent could be applied, or I need to modify something? Best regards, Vadim. > -----Original Message----- > From: vadimp@xxxxxxxxxxxx [mailto:vadimp@xxxxxxxxxxxx] > Sent: Monday, September 19, 2016 6:01 PM > To: wsa@xxxxxxxxxxxxx > Cc: linux-i2c@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; jiri@xxxxxxxxxxx; > Vadim Pasternak <vadimp@xxxxxxxxxxxx>; Michael Shych > <michaelsh@xxxxxxxxxxxx> > Subject: [patch v2] i2c: add master driver for mellanox systems > > From: Vadim Pasternak <vadimp@xxxxxxxxxxxx> > > Device driver for Mellanox I2C controller logic, implemented in Lattice CPLD > device. > Device supports: > - Master mode > - One physical bus > - Polling mode > > The Kconfig currently controlling compilation of this code is: > drivers/i2c/busses/Kconfig:config I2C_MLXCPLD > > Signed-off-by: Michael Shych <michaelsh@xxxxxxxxxxxx> > Signed-off-by: Vadim Pasternak <vadimp@xxxxxxxxxxxx> > Reviewed-by: Jiri Pirko <jiri@xxxxxxxxxxxx> > v1->v2 > Fixes added by Vadim: > - Put new record in Makefile in alphabetic order; > - Remove http://www.mellanox.com from MAINTAINERS record; > --- > Documentation/i2c/busses/i2c-mlxcpld | 47 +++ > MAINTAINERS | 8 + > drivers/i2c/busses/Kconfig | 12 + > drivers/i2c/busses/Makefile | 1 + > drivers/i2c/busses/i2c-mlxcpld.c | 597 > +++++++++++++++++++++++++++++++++++ > 5 files changed, 665 insertions(+) > create mode 100644 Documentation/i2c/busses/i2c-mlxcpld > create mode 100644 drivers/i2c/busses/i2c-mlxcpld.c > > diff --git a/Documentation/i2c/busses/i2c-mlxcpld > b/Documentation/i2c/busses/i2c-mlxcpld > new file mode 100644 > index 0000000..0f8678a > --- /dev/null > +++ b/Documentation/i2c/busses/i2c-mlxcpld > @@ -0,0 +1,47 @@ > +Driver i2c-mlxcpld > + > +Author: Michael Shych <michaelsh@xxxxxxxxxxxx> > + > +This is a for Mellanox I2C controller logic, implemented in Lattice > +CPLD device. > +Device supports: > + - Master mode. > + - One physical bus. > + - Polling mode. > + > +This controller is equipped within the next Mellanox systems: > +"msx6710", "msx6720", "msb7700", "msn2700", "msx1410", "msn2410", > +"msb7800", "msn2740", "msn2100". > + > +The next transaction types are supported: > + - Receive Byte/Block. > + - Send Byte/Block. > + - Read Byte/Block. > + - Write Byte/Block. > + > +Registers: > +CTRL 0x1 - control reg. > + Resets all the registers. > +HALF_CYC 0x4 - cycle reg. > + Configure the width of I2C SCL half clock cycle (in 4 > LPC_CLK > + units). > +I2C_HOLD 0x5 - hold reg. > + OE (output enable) is delayed by value set to this > register > + (in LPC_CLK units) > +CMD 0x6 - command reg. > + Bit 7(lsb), 0 = write, 1 = read. > + Bits [6:0] - the 7bit Address of the I2C device. > + It should be written last as it triggers an I2C transaction. > +NUM_DATA 0x7 - data size reg. > + Number of address bytes to write in read transaction > +NUM_ADDR 0x8 - address reg. > + Number of address bytes to write in read transaction. > +STATUS 0x9 - status reg. > + Bit 0 - transaction is completed. > + Bit 4 - ACK/NACK. > +DATAx 0xa - 0x54 - 68 bytes data buffer regs. > + For write transaction address is specified in four first > bytes > + (DATA1 - DATA4), data starting from DATA4. > + For read transactions address is send in separate > transaction and > + specified in four first bytes (DATA0 - DATA3). Data is > reading > + starting from DATA0. > diff --git a/MAINTAINERS b/MAINTAINERS > index 6781a3f..dc31231 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -7667,6 +7667,14 @@ W: http://www.mellanox.com > Q: http://patchwork.ozlabs.org/project/netdev/list/ > F: drivers/net/ethernet/mellanox/mlxsw/ > > +MELLANOX MLXCPLD I2C DRIVER > +M: Vadim Pasternak <vadimp@xxxxxxxxxxxx> > +M: Michael Shych <michaelsh@xxxxxxxxxxxx> > +L: linux-i2c@xxxxxxxxxxxxxxx > +S: Supported > +F: drivers/i2c/busses/i2c-mlxcpld.c > +F: Documentation/i2c/busses/i2c-mlxcpld > + > SOFT-ROCE DRIVER (rxe) > M: Moni Shoua <monis@xxxxxxxxxxxx> > L: linux-rdma@xxxxxxxxxxxxxxx > diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index > 5c3993b..1126142a 100644 > --- a/drivers/i2c/busses/Kconfig > +++ b/drivers/i2c/busses/Kconfig > @@ -1203,4 +1203,16 @@ config I2C_OPAL > This driver can also be built as a module. If so, the module will be > called as i2c-opal. > > +config I2C_MLXCPLD > + tristate "Mellanox I2C driver" > + depends on X86_64 > + default y > + help > + This exposes the Mellanox platform I2C busses to the linux I2C layer > + for X86 based systems. > + Controller is implemented as CPLD logic. > + > + This driver can also be built as a module. If so, the module will be > + called as i2c-mlxcpld. > + > endmenu > diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index > 37f2819..4df3578 100644 > --- a/drivers/i2c/busses/Makefile > +++ b/drivers/i2c/busses/Makefile > @@ -118,5 +118,6 @@ 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 > +obj-$(CONFIG_I2C_MLXCPLD) += i2c-mlxcpld.o > > ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG diff --git > a/drivers/i2c/busses/i2c-mlxcpld.c b/drivers/i2c/busses/i2c-mlxcpld.c > new file mode 100644 > index 0000000..dd62190 > --- /dev/null > +++ b/drivers/i2c/busses/i2c-mlxcpld.c > @@ -0,0 +1,597 @@ > +/* > + * drivers/i2c/busses/i2c-mlxcpld.c > + * Copyright (c) 2016 Mellanox Technologies. All rights reserved. > + * Copyright (c) 2016 Michael Shych <michaels@xxxxxxxxxxxx> > + * > + * Redistribution and use in source and binary forms, with or without > + * modification, are permitted provided that the following conditions are met: > + * > + * 1. Redistributions of source code must retain the above copyright > + * notice, this list of conditions and the following disclaimer. > + * 2. Redistributions in binary form must reproduce the above copyright > + * notice, this list of conditions and the following disclaimer in the > + * documentation and/or other materials provided with the distribution. > + * 3. Neither the names of the copyright holders nor the names of its > + * contributors may be used to endorse or promote products derived from > + * this software without specific prior written permission. > + * > + * Alternatively, this software may be distributed under the terms of > +the > + * GNU General Public License ("GPL") version 2 as published by the > +Free > + * Software Foundation. > + * > + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND > CONTRIBUTORS "AS IS" > + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT > LIMITED > +TO, THE > + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A > PARTICULAR > +PURPOSE > + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR > +CONTRIBUTORS BE > + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR > + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, > PROCUREMENT OF > + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR > +BUSINESS > + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, > WHETHER > +IN > + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR > +OTHERWISE) > + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF > ADVISED > +OF THE > + * POSSIBILITY OF SUCH DAMAGE. > + */ > + > +#include <linux/delay.h> > +#include <linux/i2c.h> > +#include <linux/init.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > + > +/* General defines */ > +#define MLXPLAT_CPLD_LPC_I2C_BASE_ADRR 0x2000 > +#define MLXCPLD_I2C_DEVICE_NAME "i2c_mlxcpld" > +#define MLXCPLD_I2C_VALID_FLAG (I2C_M_RECV_LEN | > I2C_M_RD) > +#define MLXCPLD_I2C_BUS_NUM 1 > +#define MLXCPLD_I2C_DATA_REG_SZ 36 > +#define MLXCPLD_I2C_MAX_ADDR_LEN 4 > +#define MLXCPLD_I2C_RETR_NUM 2 > +#define MLXCPLD_I2C_XFER_TO 500000 /* msec */ > +#define MLXCPLD_I2C_POLL_TIME 2000 /* msec */ > + > +/* LPC I2C registers */ > +#define MLXCPLD_LPCI2C_LPF_REG 0x0 > +#define MLXCPLD_LPCI2C_CTRL_REG 0x1 > +#define MLXCPLD_LPCI2C_HALF_CYC_REG 0x4 > +#define MLXCPLD_LPCI2C_I2C_HOLD_REG 0x5 > +#define MLXCPLD_LPCI2C_CMD_REG 0x6 > +#define MLXCPLD_LPCI2C_NUM_DAT_REG 0x7 > +#define MLXCPLD_LPCI2C_NUM_ADDR_REG 0x8 > +#define MLXCPLD_LPCI2C_STATUS_REG 0x9 > +#define MLXCPLD_LPCI2C_DATA_REG 0xa > + > +/* LPC I2C masks and parametres */ > +#define MLXCPLD_LPCI2C_RST_SEL_MASK 0x1 > +#define MLXCPLD_LPCI2C_LPF_DFLT 0x2 > +#define MLXCPLD_LPCI2C_HALF_CYC_100 0x1f > +#define MLXCPLD_LPCI2C_I2C_HOLD_100 0x3c > +#define MLXCPLD_LPCI2C_TRANS_END 0x1 > +#define MLXCPLD_LPCI2C_STATUS_NACK 0x10 > +#define MLXCPLD_LPCI2C_ERR_IND -1 > +#define MLXCPLD_LPCI2C_NO_IND 0 > +#define MLXCPLD_LPCI2C_ACK_IND 1 > +#define MLXCPLD_LPCI2C_NACK_IND 2 > + > +/** > + * mlxcpld_i2c_regs - controller registers: > + * @half_cyc - half cycle register > + * @i2c_hold - hold register > + * @config - config register > + * @cmd - command register > + * @cmd - status register > + * @data - register data > +**/ > +struct mlxcpld_i2c_regs { > + u8 half_cyc; > + u8 i2c_hold; > + u8 config; > + u8 cmd; > + u8 status; > + u8 data[MLXCPLD_I2C_DATA_REG_SZ]; > +}; > + > +/** > + * mlxcpld_i2c_curr_transf - current transaction parameters: > + * @cmd - command > + * @addr_width - address width > + * @data_len - data length > + * @cmd - command register > + * @msg_num - message number > + * @msg - pointer to message buffer > +**/ > +struct mlxcpld_i2c_curr_transf { > + u8 cmd; > + u8 addr_width; > + u8 data_len; > + u8 msg_num; > + struct i2c_msg *msg; > +}; > + > +/** > + * mlxcpld_i2c_priv - private controller data: > + * @lpc_gen_dec_reg - register space > + * @adap - i2c adapter > + * @dev_id - device id > + * @base_addr - base IO address > + * @poll_time - polling time > + * @xfer_to - transfer timeout in microsec (500000) > + * @retr_num - access retries number (2) > + * @block_sz - maximum data block size (36), > + * @lock - bus access lock > + * @lpc_i2c_res - lpc i2c resourse > + * @lpc_cpld_res - lpc cpld resource > + * @xfer - current i2c transfer block > + * @pdev - platform device > +**/ > +struct mlxcpld_i2c_priv { > + struct i2c_adapter adap; > + u16 dev_id; > + u16 base_addr; > + u16 poll_time; > + int xfer_to; > + int retr_num; > + int block_sz; > + struct mutex lock; > + struct mlxcpld_i2c_curr_transf xfer; > + struct platform_device *pdev; > +}; > +struct platform_device *mlxcpld_i2c_plat_dev; > + > +static void mlxcpld_i2c_lpc_write_buf(u8 *data, u8 len, u32 addr) { > + int i, nbyte, ndword; > + > + nbyte = len % 4; > + ndword = len / 4; > + for (i = 0; i < ndword; i++) > + outl(*((u32 *)data + i), addr + i * 4); > + ndword *= 4; > + addr += ndword; > + data += ndword; > + for (i = 0; i < nbyte; i++) > + outb(*(data + i), addr + i); > +} > + > +static void mlxcpld_i2c_lpc_read_buf(u8 *data, u8 len, u32 addr) { > + int i, nbyte, ndword; > + > + nbyte = len % 4; > + ndword = len / 4; > + for (i = 0; i < ndword; i++) > + *((u32 *)data + i) = inl(addr + i * 4); > + ndword *= 4; > + addr += ndword; > + data += ndword; > + for (i = 0; i < nbyte; i++) > + *(data + i) = inb(addr + i); > +} > + > +static void mlxcpld_i2c_read_comm(struct mlxcpld_i2c_priv *priv, u8 offs, > + u8 *data, u8 datalen) > +{ > + u32 addr = priv->base_addr + offs; > + > + switch (datalen) { > + case 1: > + *(data) = inb(addr); > + break; > + case 2: > + *((u16 *)data) = inw(addr); > + break; > + case 3: > + *((u16 *)data) = inw(addr); > + *(data + 2) = inb(addr + 2); > + break; > + case 4: > + *((u32 *)data) = inl(addr); > + break; > + default: > + mlxcpld_i2c_lpc_read_buf(data, datalen, addr); > + break; > + } > +} > + > +static void mlxcpld_i2c_write_comm(struct mlxcpld_i2c_priv *priv, u8 offs, > + u8 *data, u8 datalen) > +{ > + u32 addr = priv->base_addr + offs; > + > + switch (datalen) { > + case 1: > + outb(*(data), addr); > + break; > + case 2: > + outw(*((u16 *)data), addr); > + break; > + case 3: > + outw(*((u16 *)data), addr); > + outb(*(data + 2), addr + 2); > + break; > + case 4: > + outl(*((u32 *)data), addr); > + break; > + default: > + mlxcpld_i2c_lpc_write_buf(data, datalen, addr); > + break; > + } > +} > + > +/* Check validity of current i2c message and all transfer. > + * Calculate also coomon length of all i2c messages in transfer. > + */ > +static int mlxcpld_i2c_invalid_len(struct mlxcpld_i2c_priv *priv, > + const struct i2c_msg *msg, u8 *comm_len) { > + u8 max_len = msg->flags == I2C_M_RD ? priv->block_sz - > + MLXCPLD_I2C_MAX_ADDR_LEN : priv->block_sz; > + > + if (msg->len < 0 || msg->len > max_len) > + return -EINVAL; > + > + *comm_len += msg->len; > + if (*comm_len > priv->block_sz) > + return -EINVAL; > + else > + return 0; > +} > + > +/* Check validity of received i2c messages parameters. > + * Returns 0 if OK, other - in case of invalid parameters > + * or common length of data that should be passed to CPLD */ static > +int mlxcpld_i2c_check_msg_params(struct mlxcpld_i2c_priv *priv, > + struct i2c_msg *msgs, int num, > + u8 *comm_len) > +{ > + int i; > + > + if (!num) { > + dev_err(&priv->pdev->dev, "Incorrect 0 num of messages\n"); > + return -EINVAL; > + } > + > + if (unlikely(msgs[0].addr > 0x7f)) { > + dev_err(&priv->pdev->dev, "Invalid address 0x%03x\n", > + msgs[0].addr); > + return -EINVAL; > + } > + > + for (i = 0; i < num; ++i) { > + if (unlikely(!msgs[i].buf)) { > + dev_err(&priv->pdev->dev, "Invalid buf in msg[%d]\n", > + i); > + return -EINVAL; > + } > + if (unlikely(msgs[0].addr != msgs[i].addr)) { > + dev_err(&priv->pdev->dev, "Invalid addr in msg[%d]\n", > + i); > + return -EINVAL; > + } > + if (unlikely(mlxcpld_i2c_invalid_len(priv, &msgs[i], > + comm_len))) { > + dev_err(&priv->pdev->dev, "Invalid len %d msg[%d], > addr 0x%x, lag %u\n", > + msgs[i].len, i, msgs[i].addr, msgs[i].flags); > + return -EINVAL; > + } > + } > + > + return 0; > +} > + > +/* Check if transfer is completed and status of operation. > + * Returns 0 - transfer completed (both ACK or NACK), > + * negative - transfer isn't finished. > + */ > +static int mlxcpld_i2c_check_status(struct mlxcpld_i2c_priv *priv, int > +*status) { > + u8 val; > + > + mlxcpld_i2c_read_comm(priv, MLXCPLD_LPCI2C_STATUS_REG, &val, 1); > + > + if (val & MLXCPLD_LPCI2C_TRANS_END) { > + if (val & MLXCPLD_LPCI2C_STATUS_NACK) > + /* The slave is unable to accept the data. No such > + * slave, command not understood, or unable to accept > + * any more data. > + */ > + *status = MLXCPLD_LPCI2C_NACK_IND; > + else > + *status = MLXCPLD_LPCI2C_ACK_IND; > + return 0; > + } > + *status = MLXCPLD_LPCI2C_NO_IND; > + > + return -EIO; > +} > + > +static void mlxcpld_i2c_set_transf_data(struct mlxcpld_i2c_priv *priv, > + struct i2c_msg *msgs, int num, > + u8 comm_len) > +{ > + priv->xfer.msg = msgs; > + priv->xfer.msg_num = num; > + > + /* > + * All upper layers currently are never use transfer with more than > + * 2 messages. Actually, it's also not so relevant in Mellanox systems > + * because of HW limitation. Max size of transfer is o more than 20B > + * in current x86 LPCI2C bridge. > + */ > + priv->xfer.cmd = (msgs[num - 1].flags & I2C_M_RD); > + > + if (priv->xfer.cmd == I2C_M_RD) { > + if (comm_len == msgs[0].len) { > + /* Special case of addr_width = 0 */ > + priv->xfer.addr_width = 0; > + priv->xfer.data_len = comm_len; > + } else { > + priv->xfer.addr_width = msgs[0].len; > + priv->xfer.data_len = comm_len - priv- > >xfer.addr_width; > + } > + } else { > + /* Width (I2C_NUM_ADDR reg) isn't used in write command. */ > + priv->xfer.addr_width = 0; > + priv->xfer.data_len = comm_len; > + } > +} > + > +/* Reset CPLD LPCI2C block */ > +static void mlxcpld_i2c_reset(struct mlxcpld_i2c_priv *priv) { > + u8 val; > + > + mutex_lock(&priv->lock); > + mlxcpld_i2c_read_comm(priv, MLXCPLD_LPCI2C_CTRL_REG, &val, 1); > + val &= ~MLXCPLD_LPCI2C_RST_SEL_MASK; > + mlxcpld_i2c_write_comm(priv, MLXCPLD_LPCI2C_CTRL_REG, &val, 1); > + mutex_unlock(&priv->lock); > +} > + > +/* Make sure the CPLD is ready to start transmitting. > + * Return 0 if it is, -EBUSY if it is not. > + */ > +static int mlxcpld_i2c_check_busy(struct mlxcpld_i2c_priv *priv) { > + u8 val; > + > + mlxcpld_i2c_read_comm(priv, MLXCPLD_LPCI2C_STATUS_REG, &val, 1); > + > + if (val & MLXCPLD_LPCI2C_TRANS_END) > + return 0; > + > + return -EIO; > +} > + > +static int mlxcpld_i2c_wait_for_free(struct mlxcpld_i2c_priv *priv) { > + int timeout = 0; > + > + do { > + if (!mlxcpld_i2c_check_busy(priv)) > + break; > + usleep_range(priv->poll_time/2, priv->poll_time); > + timeout += priv->poll_time; > + } while (timeout < priv->xfer_to); > + > + if (timeout > priv->xfer_to) > + return -ETIMEDOUT; > + > + return 0; > +} > + > +/* > + * Wait for master transfer to complete. > + * It puts current process to sleep until we get interrupt or timeout expires. > + * Returns the number of transferred or read bytes or error (<0). > + */ > +static int mlxcpld_i2c_wait_for_tc(struct mlxcpld_i2c_priv *priv) { > + int status, i = 1, timeout = 0; > + u8 datalen; > + int err = 0; > + > + do { > + usleep_range(priv->poll_time / 2, priv->poll_time); > + if (!mlxcpld_i2c_check_status(priv, &status)) > + break; > + timeout += priv->poll_time; > + } while (status == 0 && timeout < priv->xfer_to); > + > + switch (status) { > + case MLXCPLD_LPCI2C_NO_IND: > + return -ETIMEDOUT; > + case MLXCPLD_LPCI2C_ACK_IND: > + if (priv->xfer.cmd == I2C_M_RD) { > + /* > + * Actual read data len will be always the same as > + * requested len. 0xff (line pull-up) will be returned > + * if slave has no data to return. Thus don't read > + * MLXCPLD_LPCI2C_NUM_DAT_REG reg from CPLD. > + */ > + err = datalen = priv->xfer.data_len; > + if (priv->xfer.msg_num == 1) > + i = 0; > + > + if (!priv->xfer.msg[i].buf) > + err = -EINVAL; > + else > + mlxcpld_i2c_read_comm(priv, > + > MLXCPLD_LPCI2C_DATA_REG, > + priv->xfer.msg[i].buf, > + datalen); > + } else { > + err = priv->xfer.addr_width + priv->xfer.data_len; > + } > + break; > + case MLXCPLD_LPCI2C_NACK_IND: > + err = -EAGAIN; > + break; > + case MLXCPLD_LPCI2C_ERR_IND: > + err = -EIO; > + break; > + default: > + break; > + } > + > + return err; > +} > + > +static void mlxcpld_i2c_xfer_msg(struct mlxcpld_i2c_priv *priv) { > + int i, len = 0; > + u8 cmd; > + > + mlxcpld_i2c_write_comm(priv, MLXCPLD_LPCI2C_NUM_DAT_REG, > + &priv->xfer.data_len, 1); > + mlxcpld_i2c_write_comm(priv, MLXCPLD_LPCI2C_NUM_ADDR_REG, > + &priv->xfer.addr_width, 1); > + > + for (i = 0; i < priv->xfer.msg_num; i++) { > + if ((priv->xfer.msg[i].flags & I2C_M_RD) != I2C_M_RD) { > + /* Don't write to CPLD buffer in read transaction */ > + mlxcpld_i2c_write_comm(priv, > MLXCPLD_LPCI2C_DATA_REG + > + len, priv->xfer.msg[i].buf, > + priv->xfer.msg[i].len); > + len += priv->xfer.msg[i].len; > + } > + } > + > + /* Set target slave address with command for master transfer. > + * It should be latest executed function before CPLD transaction. > + */ > + cmd = (priv->xfer.msg[0].addr << 1) | priv->xfer.cmd; > + mlxcpld_i2c_write_comm(priv, MLXCPLD_LPCI2C_CMD_REG, &cmd, 1); > } > + > +/* Generic lpc-i2c transfer. > + * Returns the number of processed messages or error (<0). > + */ > +static int mlxcpld_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, > + int num) > +{ > + struct mlxcpld_i2c_priv *priv = i2c_get_adapdata(adap); > + u8 comm_len = 0; > + int err; > + > + err = mlxcpld_i2c_check_msg_params(priv, msgs, num, &comm_len); > + if (err) { > + dev_err(&priv->pdev->dev, "Incorrect message\n"); > + return err; > + } > + > + /* Check bus state */ > + if (mlxcpld_i2c_wait_for_free(priv)) { > + dev_err(&priv->pdev->dev, "LPCI2C bridge is busy\n"); > + > + /* > + * Usually it means something serious has happened. > + * We can not have unfinished previous transfer > + * so it doesn't make any sense to try to stop it. > + * Probably we were not able to recover from the > + * previous error. > + * The only reasonable thing - is soft reset. > + */ > + mlxcpld_i2c_reset(priv); > + if (mlxcpld_i2c_check_busy(priv)) { > + dev_err(&priv->pdev->dev, "LPCI2C bridge is busy after > reset\n"); > + return -EIO; > + } > + } > + > + mlxcpld_i2c_set_transf_data(priv, msgs, num, comm_len); > + > + mutex_lock(&priv->lock); > + /* Do real transfer. Can't fail */ > + mlxcpld_i2c_xfer_msg(priv); > + /* Wait for transaction complete */ > + err = mlxcpld_i2c_wait_for_tc(priv); > + mutex_unlock(&priv->lock); > + > + return err < 0 ? err : num; > +} > + > +static u32 mlxcpld_i2c_func(struct i2c_adapter *adap) { > + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | > I2C_FUNC_SMBUS_BLOCK_DATA; > +} > + > +static const struct i2c_algorithm mlxcpld_i2c_algo = { > + .master_xfer = mlxcpld_i2c_xfer, > + .functionality = mlxcpld_i2c_func > +}; > + > +static struct i2c_adapter mlxcpld_i2c_adapter = { > + .owner = THIS_MODULE, > + .name = "i2c-mlxcpld", > + .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, > + .algo = &mlxcpld_i2c_algo, > +}; > + > +static int mlxcpld_i2c_probe(struct platform_device *pdev) { > + struct mlxcpld_i2c_priv *priv; > + int err; > + > + priv = devm_kzalloc(&pdev->dev, sizeof(struct mlxcpld_i2c_priv), > + GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + mutex_init(&priv->lock); > + platform_set_drvdata(pdev, priv); > + priv->pdev = pdev; > + priv->xfer_to = MLXCPLD_I2C_XFER_TO; > + priv->retr_num = MLXCPLD_I2C_RETR_NUM; > + priv->block_sz = MLXCPLD_I2C_DATA_REG_SZ; > + priv->poll_time = MLXCPLD_I2C_POLL_TIME; > + /* Register with i2c layer */ > + priv->adap = mlxcpld_i2c_adapter; > + priv->adap.dev.parent = &pdev->dev; > + i2c_set_adapdata(&priv->adap, priv); > + priv->adap.retries = priv->retr_num; > + priv->adap.nr = MLXCPLD_I2C_BUS_NUM; > + priv->adap.timeout = usecs_to_jiffies(priv->xfer_to); > + > + err = i2c_add_numbered_adapter(&priv->adap); > + if (err) { > + dev_err(&pdev->dev, "Failed to add %s adapter (%d)\n", > + MLXCPLD_I2C_DEVICE_NAME, err); > + goto fail_adapter; > + } > + > + priv->base_addr = MLXPLAT_CPLD_LPC_I2C_BASE_ADRR; > + > + return 0; > + > +fail_adapter: > + mutex_destroy(&priv->lock); > + return err; > +} > + > +static int mlxcpld_i2c_remove(struct platform_device *pdev) { > + struct mlxcpld_i2c_priv *priv = platform_get_drvdata(pdev); > + > + i2c_del_adapter(&priv->adap); > + mutex_destroy(&priv->lock); > + > + return 0; > +} > + > +static struct platform_driver mlxcpld_i2c_driver = { > + .probe = mlxcpld_i2c_probe, > + .remove = mlxcpld_i2c_remove, > + .driver = { > + .name = MLXCPLD_I2C_DEVICE_NAME, > + }, > +}; > + > +module_platform_driver(mlxcpld_i2c_driver); > + > +MODULE_AUTHOR("Michael Shych (michaels@xxxxxxxxxxxx)"); > +MODULE_DESCRIPTION("Mellanox I2C-CPLD controller driver"); > +MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:i2c-mlxcpld"); > -- > 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
