[PATCH 01/10] mfd: Add Juniper I2CS MFD driver

Pantelis Antoniou
2016-10-07T15:23:54Z

From: Georgi Vlaev <gvlaev@juniper.net>

Add Juniper's I2CS FPGA MFD driver.

This driver is bare-bones and only provides a method for the
instantiation of the following subdevices.

- I2C mux driver (i2c-mux-i2cs)
- LEDS driver (leds-jnx-i2cs)
- GPIO driver (gpio-jnx-i2cs)
- HWMON driver (i2cs-fan-hwmon)

Signed-off-by: Georgi Vlaev <gvlaev@juniper.net>
Signed-off-by: Guenter Roeck <groeck@juniper.net>
Signed-off-by: JawaharBalaji Thirumalaisamy <jawaharb@juniper.net>
[Ported from Juniper kernel]
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
---
drivers/mfd/Kconfig | 17 ++++++
drivers/mfd/Makefile | 1 +
drivers/mfd/jnx-i2cs-core.c | 118 ++++++++++++++++++++++++++++++++++++++
include/linux/mfd/jnx-i2cs-core.h | 96 +++++++++++++++++++++++++++++++
4 files changed, 232 insertions(+)
create mode 100644 drivers/mfd/jnx-i2cs-core.c
create mode 100644 include/linux/mfd/jnx-i2cs-core.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 6107f7a..82493d5 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1400,6 +1400,23 @@ config MFD_JUNIPER_CBC
This driver can be built as a module. If built as a module it will be
called "cbc-core"

+config MFD_JUNIPER_I2CS
+ tristate "Juniper I2CS FPGA"
+ depends on JNX_PTX1K_RCB || PTXPMB_COMMON || JNX_SYSTEM
+ select MFD_CORE
+ select REGMAP_I2C
+ select GPIO_JNX_I2CS
+ select I2C_MUX_I2CS
+ select LEDS_JNX_I2CS
+ depends on I2C=y
+ default y
+ help
+ Select this to enable the I2CS FPGA multi-function kernel driver.
+ This FPGA is present on almost any Juniper Networks card.
+
+ This driver can be built as a module. If built as a module it will be
+ called "jnx_i2cs"
+
config MFD_TWL4030_AUDIO
bool "TI TWL4030 Audio"
depends on TWL4030_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0ea6dc6..215d9cf 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -152,6 +152,7 @@ obj-$(CONFIG_MFD_JUNIPER_CPLD) += ptxpmb-cpld-core.o
obj-$(CONFIG_MFD_JUNIPER_SAM) += sam-core.o
obj-$(CONFIG_MFD_JUNIPER_EXT_CPLD) += ptxpmb-ext-cpld-core.o
obj-$(CONFIG_MFD_JUNIPER_CBC) += cbc-core.o
+obj-$(CONFIG_MFD_JUNIPER_I2CS) += jnx-i2cs-core.o
obj-$(CONFIG_MFD_DB8500_PRCMU) += db8500-prcmu.o
# ab8500-core need to come after db8500-prcmu (which provides the channel)
obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-sysctrl.o
diff --git a/drivers/mfd/jnx-i2cs-core.c b/drivers/mfd/jnx-i2cs-core.c
new file mode 100644
index 0000000..d279a73
--- /dev/null
+++ b/drivers/mfd/jnx-i2cs-core.c
@@ -0,0 +1,118 @@
+/*
+ * drivers/mfd/jnx-i2cs-core.c
+ *
+ * Copyright (c) 2014, Juniper Networks
+ * Author: Georgi Vlaev <gvlaev@juniper.net>
+ *
+ * The I2C Slave FPGA (I2CS) - found on almost any Juniper card.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/bug.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/mfd/core.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/mfd/jnx-i2cs-core.h>
+
+static int jnx_i2cs_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &i2c->dev;
+ struct jnx_i2cs_platform_data *pdata = dev_get_platdata(dev);
+ struct device_node *child, *np = dev->of_node;
+ struct mfd_cell *cells;
+ int ncells, ret;
+
+ if (np) {
+ ncells = of_get_child_count(np);
+ if (ncells == 0) {
+ dev_err(dev, "No child specified for %s\n", np->name);
+ return -EINVAL;
+ }
+
+ cells = devm_kzalloc(dev, ncells * sizeof(*cells), GFP_KERNEL);
+ if (!cells)
+ return -ENOMEM;
+
+ ncells = 0;
+ for_each_available_child_of_node(dev->of_node, child) {
+ const char *s;
+
+ s = of_get_property(child, "compatible", NULL);
+ if (!s) {
+ dev_err(dev,
+ "Missing compatible property for %s\n",
+ child->name);
+ return -EINVAL;
+ }
+
+ cells[ncells].name = child->name;
+ cells[ncells].of_compatible = s;
+ ncells++;
+ }
+ if (ncells == 0) {
+ dev_err(dev, "No active child for %s\n", np->name);
+ return -EINVAL;
+ }
+ } else if (pdata) {
+ cells = pdata->cells;
+ ncells = pdata->ncells;
+ } else {
+ return -ENODEV;
+ }
+
+ ret = mfd_add_devices(dev, i2c_adapter_id(i2c->adapter),
+ cells, ncells, NULL, 0, NULL);
+
+ return ret;
+}
+
+static int jnx_i2cs_remove(struct i2c_client *i2c)
+{
+ mfd_remove_devices(&i2c->dev);
+
+ return 0;
+}
+
+static const struct of_device_id jnx_i2cs_of_match[] = {
+ { .compatible = "jnx,i2cs-rcb" },
+ { .compatible = "jnx,i2cs-fpc" },
+ { .compatible = "jnx,i2cs-sib" },
+ { .compatible = "jnx,i2cs-fan" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, jnx_i2cs_of_match);
+
+static const struct i2c_device_id jnx_i2cs_id[] = {
+ { "jnx_i2cs_rcb", 0 },
+ { "jnx_i2cs_fpc", 0 },
+ { "jnx_i2cs_sib", 0 },
+ { "jnx_i2cs_fan", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, jnx_i2cs_id);
+
+static struct i2c_driver jnx_i2cs_driver = {
+ .driver = {
+ .name = "jnx_i2cs",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(jnx_i2cs_of_match),
+ },
+ .probe = jnx_i2cs_probe,
+ .remove = jnx_i2cs_remove,
+ .id_table = jnx_i2cs_id,
+};
+
+module_i2c_driver(jnx_i2cs_driver);
+
+MODULE_DESCRIPTION("Juniper I2CS MFD core driver");
+MODULE_AUTHOR("Georgi Vlaev <gvlaev@juniper.net>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/jnx-i2cs-core.h b/include/linux/mfd/jnx-i2cs-core.h
new file mode 100644
index 0000000..5e63aab
--- /dev/null
+++ b/include/linux/mfd/jnx-i2cs-core.h
@@ -0,0 +1,96 @@
+/*
+ * I2CS FPGA (jnx-i2cs-core) registers
+ *
+ * Copyright (C) 2014 Juniper Networks
+ * Author: Georgi Vlaev <gvlaev@juniper.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __JNX_I2CS_CORE_H__
+#define __JNX_I2CS_CORE_H__
+
+/* SIB I2CS registers */
+#define I2CS_SCRATCH 0x00
+#define I2CS_VERSION 0x01
+#define I2CS_MASTER_STATUS 0x02
+#define I2CS_MASTER_TIMEOUT 0x03
+#define I2CS_MASTER_FORCE 0x04
+#define I2CS_I2C0_STATUS 0x05
+#define I2CS_I2C1_STATUS 0x06
+#define I2CS_I2C_RESET 0x07
+#define I2CS_DATECODE 0x0f
+#define I2CS_INT_STATUS 0x10
+#define I2CS_INT_ENABLE 0x11
+#define I2CS_FRU_LED 0x12
+#define I2CS_MISC_IO 0x13
+#define I2CS_BUTTON_STATUS 0x14
+#define I2CS_BUTTON_ENABLE 0x15
+#define I2CS_GPIO_OE 0x16
+#define I2CS_GPIO_OUT 0x17
+#define I2CS_GPIO_IN 0x18
+#define I2CS_SERIAL_CONFIG0 0x19
+#define I2CS_SERIAL_CONFIG1 0x1a
+#define I2CS_MII_CONFIG 0x1b
+#define I2CS_MII_ADDR 0x1c
+#define I2CS_MII_DATA0 0x1d
+#define I2CS_MII_DATA1 0x1e
+#define I2CS_MII_DATA2 0x1f
+#define I2CS_PWR_CONTROL 0x20
+#define I2CS_PWR_UP_STATUS 0x21
+#define I2CS_PWR_DIS_STATUS 0x22
+#define I2CS_PWR_DIS_CAUSE 0x23
+#define I2CS_PWR_VFAIL_STATUS 0x24
+#define I2CS_PWR_VFAIL_CAUSE 0x25
+#define I2CS_PWR_TRIM_UP_A 0x26
+#define I2CS_PWR_TRIM_UP_B 0x27
+#define I2CS_PWR_TRIM_DN_A 0x28
+#define I2CS_PWR_TRIM_DN_B 0x29
+#define I2CS_PWR_VFAIL_STATUS_B 0x2a
+#define I2CS_PWR_VFAIL_CAUSE_B 0x2b
+#define I2CS_SCB 0x2c
+#define I2CS_RESET_I2CS_REG 0x2d
+#define I2CS_RESET_CONTROL 0x40
+#define I2CS_SIB_ID_PORT_STATUS 0x41
+#define I2CS_SIB_PCIE_GEN 0x42
+#define I2CS_TF_LTC 0x43
+#define I2CS_POWER_RST_HSWAP 0x44
+#define I2CS_SIB_EN 0x45
+#define I2CS_SIB_SPARE 0x46
+#define I2CS_TF_PCIE_INT_STAT 0x47
+#define I2CS_TF_PCIE_INT_EN 0x48
+#define I2CS_SIB_MISC_0 0x49
+#define I2CS_SIB_MISC_1 0x4a
+#define I2CS_LINK_STATUS_0 0x4b
+#define I2CS_LINK_STATUS_1 0x4c
+#define I2CS_LINK_STATUS_2 0x4d
+#define I2CS_LINK_STATUS_3 0x4e
+#define I2CS_LINK_STATUS_4 0x4f
+#define I2CS_LINK_STATUS_5 0x50
+#define I2CS_LINK_STATUS_6 0x51
+#define I2CS_LINK_STATUS_7 0x52
+#define I2CS_LINK_STATUS_8 0x53
+#define I2CS_LINK_STATUS_9 0x54
+#define I2CS_LINK_STATUS_10 0x55
+#define I2CS_LINK_STATUS_11 0x56
+#define I2CS_LINK_STATUS_12 0x57
+#define I2CS_LINK_STATUS_13 0x58
+#define I2CS_LINK_STATUS_14 0x59
+#define I2CS_LINK_STATUS_15 0x5a
+#define I2CS_LINK_STATUS_16 0x5b
+#define I2CS_LINK_STATUS_17 0x5c
+#define I2CS_PWR_VFAIL_IGNORE_SNG 0x5d
+#define I2CS_SPARE 0x5e
+#define I2CS_SPARE_OE 0x5f
+#define I2CS_MAX_REGISTER I2CS_SPARE_OE
+
+struct mfd_cell;
+
+struct jnx_i2cs_platform_data {
+ int ncells;
+ struct mfd_cell *cells;
+};
+
+#endif /*__JNX_I2CS_CORE_H__*/
--
1.9.1