FPGA on LX2160AQDS/LX2160ARDB connected on I2C bus, so add qixis
driver which is basically an i2c client driver to control FPGA.
Signed-off-by: Wang Dongsheng <dongsheng.w...@freescale.com>
Signed-off-by: Pankaj Bansal <pankaj.ban...@nxp.com>
---
Notes:
V2:
- Modify the driver to not create platform devices corresponding to
subnodes.
because the subnodes are not actual devices.
- Use mdio_mux_regmap_init/mdio_mux_regmap_uninit
- Remove header file from include folder, as no qixis api is called from
outside
- Add regmap_exit in driver's remove function
Dendencies:
- https://www.mail-archive.com/netdev@vger.kernel.org/msg281274.html
drivers/soc/fsl/Kconfig | 8 +++
drivers/soc/fsl/Makefile | 1 +
drivers/soc/fsl/qixis_ctrl.c | 121 +++++++++++++++++++++++++++++++++
3 files changed, 130 insertions(+)
diff --git a/drivers/soc/fsl/Kconfig b/drivers/soc/fsl/Kconfig
index 8a0ba6da6f8a..e787d3e637a4 100644
--- a/drivers/soc/fsl/Kconfig
+++ b/drivers/soc/fsl/Kconfig
@@ -36,6 +36,14 @@ config FSL_SLEEP_FSM
The FSM is used to finish clean-ups at the last stage of system
entering deep
sleep, and also wakes up system when a wake up event happens.
+config FSL_QIXIS
+ tristate "QIXIS system controller driver"
+ depends on REGMAP_I2C
+ default n
+ help
+ Say y here to enable QIXIS system controller api. The qixis driver
+ provides FPGA functions to control system.
+
if ARM || ARM64
source "drivers/soc/fsl/Kconfig.arm"
endif
diff --git a/drivers/soc/fsl/Makefile b/drivers/soc/fsl/Makefile
index ffdf93b34501..db7b09bfbd91 100644
--- a/drivers/soc/fsl/Makefile
+++ b/drivers/soc/fsl/Makefile
@@ -5,6 +5,7 @@
obj-$(CONFIG_FSL_DPAA) += qbman/
obj-$(CONFIG_QUICC_ENGINE) += qe/
obj-$(CONFIG_CPM) += qe/
+obj-$(CONFIG_FSL_QIXIS) += qixis_ctrl.o
obj-$(CONFIG_FSL_GUTS) += guts.o
obj-$(CONFIG_FSL_MC_DPIO) += dpio/
obj-$(CONFIG_FSL_LS2_CONSOLE) += ls2-console/
diff --git a/drivers/soc/fsl/qixis_ctrl.c b/drivers/soc/fsl/qixis_ctrl.c
new file mode 100644
index 000000000000..336f366e228e
--- /dev/null
+++ b/drivers/soc/fsl/qixis_ctrl.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/* Freescale QIXIS system controller driver.
+ *
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ * Copyright 2018 NXP
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mdio-mux.h>
+
+/* QIXIS MAP */
+struct fsl_qixis_regs {
+ u8 id; /* Identification Registers */
+ u8 version; /* Version Register */
+ u8 qixis_ver; /* QIXIS Version Register */
+ u8 reserved1[0x1f];
+};
+
+struct mdio_mux_data {
+ void *data;
+ struct list_head link;
+};
+
+struct qixis_priv {
+ struct regmap *regmap;
+ struct list_head mdio_mux_list;
+};
+
+static struct regmap_config qixis_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int fsl_qixis_i2c_probe(struct i2c_client *client)
+{
+ struct device_node *child;
+ struct qixis_priv *priv;
+ int ret;
+ u32 qver;
+ struct mdio_mux_data *mux_data;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -EOPNOTSUPP;
+
+ priv = devm_kzalloc(&client->dev, sizeof(struct qixis_priv),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->regmap = regmap_init_i2c(client, &qixis_regmap_config);
+ INIT_LIST_HEAD(&priv->mdio_mux_list);
+
+ regmap_read(priv->regmap, offsetof(struct fsl_qixis_regs, qixis_ver),
+ &qver);
+ pr_info("Freescale QIXIS Version: 0x%08x\n", qver);
+
+ for_each_child_of_node(client->dev.of_node, child) {
+ if (of_node_name_prefix(child, "mdio-mux")) {
+ mux_data = devm_kzalloc(&client->dev,
+ sizeof(struct mdio_mux_data),
+ GFP_KERNEL);
+ if (!mux_data)
+ return -ENOMEM;
+ ret = mdio_mux_regmap_init(&client->dev, child,
+ &mux_data->data);
+ if (ret)
+ return ret;
+ list_add(&mux_data->link, &priv->mdio_mux_list);
+ }
+ };
+
+ i2c_set_clientdata(client, priv);
+
+ return 0;
+}
+
+static int fsl_qixis_i2c_remove(struct i2c_client *client)
+{
+ struct qixis_priv *priv;
+ struct list_head *pos;
+ struct mdio_mux_data *mux_data;
+
+ priv = i2c_get_clientdata(client);
+ list_for_each(pos, &priv->mdio_mux_list) {
+ mux_data = list_entry(pos, struct mdio_mux_data, link);
+ mdio_mux_regmap_uninit(mux_data->data);
+ }
+ regmap_exit(priv->regmap);
+
+ return 0;
+}
+
+static const struct of_device_id fsl_qixis_of_match[] = {
+ { .compatible = "fsl,fpga-qixis-i2c" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, fsl_qixis_of_match);
+
+static struct i2c_driver fsl_qixis_i2c_driver = {
+ .driver = {
+ .name = "qixis_ctrl",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(fsl_qixis_of_match),
+ },
+ .probe_new = fsl_qixis_i2c_probe,
+ .remove = fsl_qixis_i2c_remove,
+};
+module_i2c_driver(fsl_qixis_i2c_driver);
+
+MODULE_AUTHOR("Wang Dongsheng <dongsheng.w...@freescale.com>");
+MODULE_DESCRIPTION("Freescale QIXIS system controller driver");
+MODULE_LICENSE("GPL v2");
--
2.17.1
