Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / net / phy / mdio-mux-gpio.c

diff --git a/kernel/drivers/net/phy/mdio-mux-gpio.c b/kernel/drivers/net/phy/mdio-mux-gpio.c
new file mode 100644 (file)
index 0000000..66edd99
--- /dev/null
+++ b/kernel/drivers/net/phy/mdio-mux-gpio.c
@@ -0,0 +1,102 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2011, 2012 Cavium, Inc.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/of_mdio.h>
+#include <linux/module.h>
+#include <linux/phy.h>
+#include <linux/mdio-mux.h>
+#include <linux/gpio/consumer.h>
+
+#define DRV_VERSION "1.1"
+#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
+
+struct mdio_mux_gpio_state {
+       struct gpio_descs *gpios;
+       void *mux_handle;
+};
+
+static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
+                                  void *data)
+{
+       struct mdio_mux_gpio_state *s = data;
+       int values[s->gpios->ndescs];
+       unsigned int n;
+
+       if (current_child == desired_child)
+               return 0;
+
+       for (n = 0; n < s->gpios->ndescs; n++)
+               values[n] = (desired_child >> n) & 1;
+
+       gpiod_set_array_cansleep(s->gpios->ndescs, s->gpios->desc, values);
+
+       return 0;
+}
+
+static int mdio_mux_gpio_probe(struct platform_device *pdev)
+{
+       struct mdio_mux_gpio_state *s;
+       int r;
+
+       s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
+       if (!s)
+               return -ENOMEM;
+
+       s->gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
+       if (IS_ERR(s->gpios))
+               return PTR_ERR(s->gpios);
+
+       r = mdio_mux_init(&pdev->dev,
+                         mdio_mux_gpio_switch_fn, &s->mux_handle, s);
+
+       if (r != 0) {
+               gpiod_put_array(s->gpios);
+               return r;
+       }
+
+       pdev->dev.platform_data = s;
+       return 0;
+}
+
+static int mdio_mux_gpio_remove(struct platform_device *pdev)
+{
+       struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
+       mdio_mux_uninit(s->mux_handle);
+       gpiod_put_array(s->gpios);
+       return 0;
+}
+
+static const struct of_device_id mdio_mux_gpio_match[] = {
+       {
+               .compatible = "mdio-mux-gpio",
+       },
+       {
+               /* Legacy compatible property. */
+               .compatible = "cavium,mdio-mux-sn74cbtlv3253",
+       },
+       {},
+};
+MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
+
+static struct platform_driver mdio_mux_gpio_driver = {
+       .driver = {
+               .name           = "mdio-mux-gpio",
+               .of_match_table = mdio_mux_gpio_match,
+       },
+       .probe          = mdio_mux_gpio_probe,
+       .remove         = mdio_mux_gpio_remove,
+};
+
+module_platform_driver(mdio_mux_gpio_driver);
+
+MODULE_DESCRIPTION(DRV_DESCRIPTION);
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("David Daney");
+MODULE_LICENSE("GPL");