diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-mlxcpld.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-mlxcpld.c | 97 |
1 files changed, 66 insertions, 31 deletions
diff --git a/drivers/i2c/busses/i2c-mlxcpld.c b/drivers/i2c/busses/i2c-mlxcpld.c index 71d7bae2cbca..4e0b7c2882ce 100644 --- a/drivers/i2c/busses/i2c-mlxcpld.c +++ b/drivers/i2c/busses/i2c-mlxcpld.c @@ -1,34 +1,8 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /* - * Copyright (c) 2016 Mellanox Technologies. All rights reserved. - * Copyright (c) 2016 Michael Shych <michaels@mellanox.com> + * Mellanox i2c driver * - * 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. + * Copyright (C) 2016-2020 Mellanox Technologies */ #include <linux/delay.h> @@ -37,7 +11,9 @@ #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/platform_data/mlxreg.h> #include <linux/platform_device.h> +#include <linux/regmap.h> /* General defines */ #define MLXPLAT_CPLD_LPC_I2C_BASE_ADDR 0x2000 @@ -51,7 +27,7 @@ #define MLXCPLD_I2C_MAX_ADDR_LEN 4 #define MLXCPLD_I2C_RETR_NUM 2 #define MLXCPLD_I2C_XFER_TO 500000 /* usec */ -#define MLXCPLD_I2C_POLL_TIME 2000 /* usec */ +#define MLXCPLD_I2C_POLL_TIME 400 /* usec */ /* LPC I2C registers */ #define MLXCPLD_LPCI2C_CPBLTY_REG 0x0 @@ -72,6 +48,16 @@ #define MLXCPLD_LPCI2C_ACK_IND 1 #define MLXCPLD_LPCI2C_NACK_IND 2 +#define MLXCPLD_I2C_FREQ_1000KHZ_SET 0x04 +#define MLXCPLD_I2C_FREQ_400KHZ_SET 0x0f +#define MLXCPLD_I2C_FREQ_100KHZ_SET 0x42 + +enum mlxcpld_i2c_frequency { + MLXCPLD_I2C_FREQ_1000KHZ = 1, + MLXCPLD_I2C_FREQ_400KHZ = 2, + MLXCPLD_I2C_FREQ_100KHZ = 3, +}; + struct mlxcpld_i2c_curr_xfer { u8 cmd; u8 addr_width; @@ -489,8 +475,45 @@ static struct i2c_adapter mlxcpld_i2c_adapter = { .nr = MLXCPLD_I2C_BUS_NUM, }; +static int +mlxcpld_i2c_set_frequency(struct mlxcpld_i2c_priv *priv, + struct mlxreg_core_hotplug_platform_data *pdata) +{ + struct mlxreg_core_item *item = pdata->items; + struct mlxreg_core_data *data; + u32 regval; + u8 freq; + int err; + + if (!item) + return 0; + + /* Read frequency setting. */ + data = item->data; + err = regmap_read(pdata->regmap, data->reg, ®val); + if (err) + return err; + + /* Set frequency only if it is not 100KHz, which is default. */ + switch ((data->reg & data->mask) >> data->bit) { + case MLXCPLD_I2C_FREQ_1000KHZ: + freq = MLXCPLD_I2C_FREQ_1000KHZ_SET; + break; + case MLXCPLD_I2C_FREQ_400KHZ: + freq = MLXCPLD_I2C_FREQ_400KHZ_SET; + break; + default: + return 0; + } + + mlxcpld_i2c_write_comm(priv, MLXCPLD_LPCI2C_HALF_CYC_REG, &freq, 1); + + return 0; +} + static int mlxcpld_i2c_probe(struct platform_device *pdev) { + struct mlxreg_core_hotplug_platform_data *pdata; struct mlxcpld_i2c_priv *priv; int err; u8 val; @@ -505,6 +528,14 @@ static int mlxcpld_i2c_probe(struct platform_device *pdev) priv->dev = &pdev->dev; priv->base_addr = MLXPLAT_CPLD_LPC_I2C_BASE_ADDR; + /* Set I2C bus frequency if platform data provides this info. */ + pdata = dev_get_platdata(&pdev->dev); + if (pdata) { + err = mlxcpld_i2c_set_frequency(priv, pdata); + if (err) + goto mlxcpld_i2_probe_failed; + } + /* Register with i2c layer */ mlxcpld_i2c_adapter.timeout = usecs_to_jiffies(MLXCPLD_I2C_XFER_TO); /* Read capability register */ @@ -523,8 +554,12 @@ static int mlxcpld_i2c_probe(struct platform_device *pdev) err = i2c_add_numbered_adapter(&priv->adap); if (err) - mutex_destroy(&priv->lock); + goto mlxcpld_i2_probe_failed; + return 0; + +mlxcpld_i2_probe_failed: + mutex_destroy(&priv->lock); return err; } |