summaryrefslogtreecommitdiff
path: root/drivers/net/dsa/lan9303_mdio.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/dsa/lan9303_mdio.c')
-rw-r--r--drivers/net/dsa/lan9303_mdio.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/net/dsa/lan9303_mdio.c b/drivers/net/dsa/lan9303_mdio.c
new file mode 100644
index 000000000000..93c36c0541cf
--- /dev/null
+++ b/drivers/net/dsa/lan9303_mdio.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
+ *
+ * Partially based on a patch from
+ * Copyright (c) 2014 Stefan Roese <sr@denx.de>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mdio.h>
+#include <linux/phy.h>
+#include <linux/of.h>
+
+#include "lan9303.h"
+
+/* Generate phy-addr and -reg from the input address */
+#define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f)
+#define PHY_REG(x) (((x) >> 1) & 0x1f)
+
+struct lan9303_mdio {
+ struct mdio_device *device;
+ struct lan9303 chip;
+};
+
+static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val)
+{
+ mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val);
+}
+
+static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val)
+{
+ struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
+
+ mutex_lock(&sw_dev->device->bus->mdio_lock);
+ lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff);
+ lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff);
+ mutex_unlock(&sw_dev->device->bus->mdio_lock);
+
+ return 0;
+}
+
+static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg)
+{
+ return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg));
+}
+
+static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)
+{
+ struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
+
+ mutex_lock(&sw_dev->device->bus->mdio_lock);
+ *val = lan9303_mdio_real_read(sw_dev->device, reg);
+ *val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16);
+ mutex_unlock(&sw_dev->device->bus->mdio_lock);
+
+ return 0;
+}
+
+static const struct regmap_config lan9303_mdio_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 32,
+ .reg_stride = 1,
+ .can_multi_write = true,
+ .max_register = 0x0ff, /* address bits 0..1 are not used */
+ .reg_format_endian = REGMAP_ENDIAN_LITTLE,
+
+ .volatile_table = &lan9303_register_set,
+ .wr_table = &lan9303_register_set,
+ .rd_table = &lan9303_register_set,
+
+ .reg_read = lan9303_mdio_read,
+ .reg_write = lan9303_mdio_write,
+
+ .cache_type = REGCACHE_NONE,
+};
+
+static int lan9303_mdio_probe(struct mdio_device *mdiodev)
+{
+ struct lan9303_mdio *sw_dev;
+ int ret;
+
+ sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio),
+ GFP_KERNEL);
+ if (!sw_dev)
+ return -ENOMEM;
+
+ sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev,
+ &lan9303_mdio_regmap_config);
+ if (IS_ERR(sw_dev->chip.regmap)) {
+ ret = PTR_ERR(sw_dev->chip.regmap);
+ dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);
+ return ret;
+ }
+
+ /* link forward and backward */
+ sw_dev->device = mdiodev;
+ dev_set_drvdata(&mdiodev->dev, sw_dev);
+ sw_dev->chip.dev = &mdiodev->dev;
+
+ ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);
+ if (ret != 0)
+ return ret;
+
+ dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n");
+
+ return 0;
+}
+
+static void lan9303_mdio_remove(struct mdio_device *mdiodev)
+{
+ struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);
+
+ if (!sw_dev)
+ return;
+
+ lan9303_remove(&sw_dev->chip);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static const struct of_device_id lan9303_mdio_of_match[] = {
+ { .compatible = "smsc,lan9303-mdio" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);
+
+static struct mdio_driver lan9303_mdio_driver = {
+ .mdiodrv.driver = {
+ .name = "LAN9303_MDIO",
+ .of_match_table = of_match_ptr(lan9303_mdio_of_match),
+ },
+ .probe = lan9303_mdio_probe,
+ .remove = lan9303_mdio_remove,
+};
+mdio_module_driver(lan9303_mdio_driver);
+
+MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>");
+MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode");
+MODULE_LICENSE("GPL v2");