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path: root/drivers/net/dsa/realtek/realtek-smi.c
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Diffstat (limited to 'drivers/net/dsa/realtek/realtek-smi.c')
-rw-r--r--drivers/net/dsa/realtek/realtek-smi.c570
1 files changed, 570 insertions, 0 deletions
diff --git a/drivers/net/dsa/realtek/realtek-smi.c b/drivers/net/dsa/realtek/realtek-smi.c
new file mode 100644
index 000000000..1b447d96b
--- /dev/null
+++ b/drivers/net/dsa/realtek/realtek-smi.c
@@ -0,0 +1,570 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Realtek Simple Management Interface (SMI) driver
+ * It can be discussed how "simple" this interface is.
+ *
+ * The SMI protocol piggy-backs the MDIO MDC and MDIO signals levels
+ * but the protocol is not MDIO at all. Instead it is a Realtek
+ * pecularity that need to bit-bang the lines in a special way to
+ * communicate with the switch.
+ *
+ * ASICs we intend to support with this driver:
+ *
+ * RTL8366 - The original version, apparently
+ * RTL8369 - Similar enough to have the same datsheet as RTL8366
+ * RTL8366RB - Probably reads out "RTL8366 revision B", has a quite
+ * different register layout from the other two
+ * RTL8366S - Is this "RTL8366 super"?
+ * RTL8367 - Has an OpenWRT driver as well
+ * RTL8368S - Seems to be an alternative name for RTL8366RB
+ * RTL8370 - Also uses SMI
+ *
+ * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
+ * Copyright (C) 2010 Antti Seppälä <a.seppala@gmail.com>
+ * Copyright (C) 2010 Roman Yeryomin <roman@advem.lv>
+ * Copyright (C) 2011 Colin Leitner <colin.leitner@googlemail.com>
+ * Copyright (C) 2009-2010 Gabor Juhos <juhosg@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_mdio.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/bitops.h>
+#include <linux/if_bridge.h>
+
+#include "realtek.h"
+
+#define REALTEK_SMI_ACK_RETRY_COUNT 5
+
+static inline void realtek_smi_clk_delay(struct realtek_priv *priv)
+{
+ ndelay(priv->clk_delay);
+}
+
+static void realtek_smi_start(struct realtek_priv *priv)
+{
+ /* Set GPIO pins to output mode, with initial state:
+ * SCK = 0, SDA = 1
+ */
+ gpiod_direction_output(priv->mdc, 0);
+ gpiod_direction_output(priv->mdio, 1);
+ realtek_smi_clk_delay(priv);
+
+ /* CLK 1: 0 -> 1, 1 -> 0 */
+ gpiod_set_value(priv->mdc, 1);
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdc, 0);
+ realtek_smi_clk_delay(priv);
+
+ /* CLK 2: */
+ gpiod_set_value(priv->mdc, 1);
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdio, 0);
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdc, 0);
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdio, 1);
+}
+
+static void realtek_smi_stop(struct realtek_priv *priv)
+{
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdio, 0);
+ gpiod_set_value(priv->mdc, 1);
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdio, 1);
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdc, 1);
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdc, 0);
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdc, 1);
+
+ /* Add a click */
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdc, 0);
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdc, 1);
+
+ /* Set GPIO pins to input mode */
+ gpiod_direction_input(priv->mdio);
+ gpiod_direction_input(priv->mdc);
+}
+
+static void realtek_smi_write_bits(struct realtek_priv *priv, u32 data, u32 len)
+{
+ for (; len > 0; len--) {
+ realtek_smi_clk_delay(priv);
+
+ /* Prepare data */
+ gpiod_set_value(priv->mdio, !!(data & (1 << (len - 1))));
+ realtek_smi_clk_delay(priv);
+
+ /* Clocking */
+ gpiod_set_value(priv->mdc, 1);
+ realtek_smi_clk_delay(priv);
+ gpiod_set_value(priv->mdc, 0);
+ }
+}
+
+static void realtek_smi_read_bits(struct realtek_priv *priv, u32 len, u32 *data)
+{
+ gpiod_direction_input(priv->mdio);
+
+ for (*data = 0; len > 0; len--) {
+ u32 u;
+
+ realtek_smi_clk_delay(priv);
+
+ /* Clocking */
+ gpiod_set_value(priv->mdc, 1);
+ realtek_smi_clk_delay(priv);
+ u = !!gpiod_get_value(priv->mdio);
+ gpiod_set_value(priv->mdc, 0);
+
+ *data |= (u << (len - 1));
+ }
+
+ gpiod_direction_output(priv->mdio, 0);
+}
+
+static int realtek_smi_wait_for_ack(struct realtek_priv *priv)
+{
+ int retry_cnt;
+
+ retry_cnt = 0;
+ do {
+ u32 ack;
+
+ realtek_smi_read_bits(priv, 1, &ack);
+ if (ack == 0)
+ break;
+
+ if (++retry_cnt > REALTEK_SMI_ACK_RETRY_COUNT) {
+ dev_err(priv->dev, "ACK timeout\n");
+ return -ETIMEDOUT;
+ }
+ } while (1);
+
+ return 0;
+}
+
+static int realtek_smi_write_byte(struct realtek_priv *priv, u8 data)
+{
+ realtek_smi_write_bits(priv, data, 8);
+ return realtek_smi_wait_for_ack(priv);
+}
+
+static int realtek_smi_write_byte_noack(struct realtek_priv *priv, u8 data)
+{
+ realtek_smi_write_bits(priv, data, 8);
+ return 0;
+}
+
+static int realtek_smi_read_byte0(struct realtek_priv *priv, u8 *data)
+{
+ u32 t;
+
+ /* Read data */
+ realtek_smi_read_bits(priv, 8, &t);
+ *data = (t & 0xff);
+
+ /* Send an ACK */
+ realtek_smi_write_bits(priv, 0x00, 1);
+
+ return 0;
+}
+
+static int realtek_smi_read_byte1(struct realtek_priv *priv, u8 *data)
+{
+ u32 t;
+
+ /* Read data */
+ realtek_smi_read_bits(priv, 8, &t);
+ *data = (t & 0xff);
+
+ /* Send an ACK */
+ realtek_smi_write_bits(priv, 0x01, 1);
+
+ return 0;
+}
+
+static int realtek_smi_read_reg(struct realtek_priv *priv, u32 addr, u32 *data)
+{
+ unsigned long flags;
+ u8 lo = 0;
+ u8 hi = 0;
+ int ret;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ realtek_smi_start(priv);
+
+ /* Send READ command */
+ ret = realtek_smi_write_byte(priv, priv->cmd_read);
+ if (ret)
+ goto out;
+
+ /* Set ADDR[7:0] */
+ ret = realtek_smi_write_byte(priv, addr & 0xff);
+ if (ret)
+ goto out;
+
+ /* Set ADDR[15:8] */
+ ret = realtek_smi_write_byte(priv, addr >> 8);
+ if (ret)
+ goto out;
+
+ /* Read DATA[7:0] */
+ realtek_smi_read_byte0(priv, &lo);
+ /* Read DATA[15:8] */
+ realtek_smi_read_byte1(priv, &hi);
+
+ *data = ((u32)lo) | (((u32)hi) << 8);
+
+ ret = 0;
+
+ out:
+ realtek_smi_stop(priv);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return ret;
+}
+
+static int realtek_smi_write_reg(struct realtek_priv *priv,
+ u32 addr, u32 data, bool ack)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ realtek_smi_start(priv);
+
+ /* Send WRITE command */
+ ret = realtek_smi_write_byte(priv, priv->cmd_write);
+ if (ret)
+ goto out;
+
+ /* Set ADDR[7:0] */
+ ret = realtek_smi_write_byte(priv, addr & 0xff);
+ if (ret)
+ goto out;
+
+ /* Set ADDR[15:8] */
+ ret = realtek_smi_write_byte(priv, addr >> 8);
+ if (ret)
+ goto out;
+
+ /* Write DATA[7:0] */
+ ret = realtek_smi_write_byte(priv, data & 0xff);
+ if (ret)
+ goto out;
+
+ /* Write DATA[15:8] */
+ if (ack)
+ ret = realtek_smi_write_byte(priv, data >> 8);
+ else
+ ret = realtek_smi_write_byte_noack(priv, data >> 8);
+ if (ret)
+ goto out;
+
+ ret = 0;
+
+ out:
+ realtek_smi_stop(priv);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return ret;
+}
+
+/* There is one single case when we need to use this accessor and that
+ * is when issueing soft reset. Since the device reset as soon as we write
+ * that bit, no ACK will come back for natural reasons.
+ */
+static int realtek_smi_write_reg_noack(void *ctx, u32 reg, u32 val)
+{
+ return realtek_smi_write_reg(ctx, reg, val, false);
+}
+
+/* Regmap accessors */
+
+static int realtek_smi_write(void *ctx, u32 reg, u32 val)
+{
+ struct realtek_priv *priv = ctx;
+
+ return realtek_smi_write_reg(priv, reg, val, true);
+}
+
+static int realtek_smi_read(void *ctx, u32 reg, u32 *val)
+{
+ struct realtek_priv *priv = ctx;
+
+ return realtek_smi_read_reg(priv, reg, val);
+}
+
+static void realtek_smi_lock(void *ctx)
+{
+ struct realtek_priv *priv = ctx;
+
+ mutex_lock(&priv->map_lock);
+}
+
+static void realtek_smi_unlock(void *ctx)
+{
+ struct realtek_priv *priv = ctx;
+
+ mutex_unlock(&priv->map_lock);
+}
+
+static const struct regmap_config realtek_smi_regmap_config = {
+ .reg_bits = 10, /* A4..A0 R4..R0 */
+ .val_bits = 16,
+ .reg_stride = 1,
+ /* PHY regs are at 0x8000 */
+ .max_register = 0xffff,
+ .reg_format_endian = REGMAP_ENDIAN_BIG,
+ .reg_read = realtek_smi_read,
+ .reg_write = realtek_smi_write,
+ .cache_type = REGCACHE_NONE,
+ .lock = realtek_smi_lock,
+ .unlock = realtek_smi_unlock,
+};
+
+static const struct regmap_config realtek_smi_nolock_regmap_config = {
+ .reg_bits = 10, /* A4..A0 R4..R0 */
+ .val_bits = 16,
+ .reg_stride = 1,
+ /* PHY regs are at 0x8000 */
+ .max_register = 0xffff,
+ .reg_format_endian = REGMAP_ENDIAN_BIG,
+ .reg_read = realtek_smi_read,
+ .reg_write = realtek_smi_write,
+ .cache_type = REGCACHE_NONE,
+ .disable_locking = true,
+};
+
+static int realtek_smi_mdio_read(struct mii_bus *bus, int addr, int regnum)
+{
+ struct realtek_priv *priv = bus->priv;
+
+ return priv->ops->phy_read(priv, addr, regnum);
+}
+
+static int realtek_smi_mdio_write(struct mii_bus *bus, int addr, int regnum,
+ u16 val)
+{
+ struct realtek_priv *priv = bus->priv;
+
+ return priv->ops->phy_write(priv, addr, regnum, val);
+}
+
+static int realtek_smi_setup_mdio(struct dsa_switch *ds)
+{
+ struct realtek_priv *priv = ds->priv;
+ struct device_node *mdio_np;
+ int ret;
+
+ mdio_np = of_get_compatible_child(priv->dev->of_node, "realtek,smi-mdio");
+ if (!mdio_np) {
+ dev_err(priv->dev, "no MDIO bus node\n");
+ return -ENODEV;
+ }
+
+ priv->slave_mii_bus = devm_mdiobus_alloc(priv->dev);
+ if (!priv->slave_mii_bus) {
+ ret = -ENOMEM;
+ goto err_put_node;
+ }
+ priv->slave_mii_bus->priv = priv;
+ priv->slave_mii_bus->name = "SMI slave MII";
+ priv->slave_mii_bus->read = realtek_smi_mdio_read;
+ priv->slave_mii_bus->write = realtek_smi_mdio_write;
+ snprintf(priv->slave_mii_bus->id, MII_BUS_ID_SIZE, "SMI-%d",
+ ds->index);
+ priv->slave_mii_bus->dev.of_node = mdio_np;
+ priv->slave_mii_bus->parent = priv->dev;
+ ds->slave_mii_bus = priv->slave_mii_bus;
+
+ ret = devm_of_mdiobus_register(priv->dev, priv->slave_mii_bus, mdio_np);
+ if (ret) {
+ dev_err(priv->dev, "unable to register MDIO bus %s\n",
+ priv->slave_mii_bus->id);
+ goto err_put_node;
+ }
+
+ return 0;
+
+err_put_node:
+ of_node_put(mdio_np);
+
+ return ret;
+}
+
+static int realtek_smi_probe(struct platform_device *pdev)
+{
+ const struct realtek_variant *var;
+ struct device *dev = &pdev->dev;
+ struct realtek_priv *priv;
+ struct regmap_config rc;
+ struct device_node *np;
+ int ret;
+
+ var = of_device_get_match_data(dev);
+ np = dev->of_node;
+
+ priv = devm_kzalloc(dev, sizeof(*priv) + var->chip_data_sz, GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ priv->chip_data = (void *)priv + sizeof(*priv);
+
+ mutex_init(&priv->map_lock);
+
+ rc = realtek_smi_regmap_config;
+ rc.lock_arg = priv;
+ priv->map = devm_regmap_init(dev, NULL, priv, &rc);
+ if (IS_ERR(priv->map)) {
+ ret = PTR_ERR(priv->map);
+ dev_err(dev, "regmap init failed: %d\n", ret);
+ return ret;
+ }
+
+ rc = realtek_smi_nolock_regmap_config;
+ priv->map_nolock = devm_regmap_init(dev, NULL, priv, &rc);
+ if (IS_ERR(priv->map_nolock)) {
+ ret = PTR_ERR(priv->map_nolock);
+ dev_err(dev, "regmap init failed: %d\n", ret);
+ return ret;
+ }
+
+ /* Link forward and backward */
+ priv->dev = dev;
+ priv->clk_delay = var->clk_delay;
+ priv->cmd_read = var->cmd_read;
+ priv->cmd_write = var->cmd_write;
+ priv->ops = var->ops;
+
+ priv->setup_interface = realtek_smi_setup_mdio;
+ priv->write_reg_noack = realtek_smi_write_reg_noack;
+
+ dev_set_drvdata(dev, priv);
+ spin_lock_init(&priv->lock);
+
+ /* TODO: if power is software controlled, set up any regulators here */
+
+ priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(priv->reset)) {
+ dev_err(dev, "failed to get RESET GPIO\n");
+ return PTR_ERR(priv->reset);
+ }
+ if (priv->reset) {
+ gpiod_set_value(priv->reset, 1);
+ dev_dbg(dev, "asserted RESET\n");
+ msleep(REALTEK_HW_STOP_DELAY);
+ gpiod_set_value(priv->reset, 0);
+ msleep(REALTEK_HW_START_DELAY);
+ dev_dbg(dev, "deasserted RESET\n");
+ }
+
+ /* Fetch MDIO pins */
+ priv->mdc = devm_gpiod_get_optional(dev, "mdc", GPIOD_OUT_LOW);
+ if (IS_ERR(priv->mdc))
+ return PTR_ERR(priv->mdc);
+ priv->mdio = devm_gpiod_get_optional(dev, "mdio", GPIOD_OUT_LOW);
+ if (IS_ERR(priv->mdio))
+ return PTR_ERR(priv->mdio);
+
+ priv->leds_disabled = of_property_read_bool(np, "realtek,disable-leds");
+
+ ret = priv->ops->detect(priv);
+ if (ret) {
+ dev_err(dev, "unable to detect switch\n");
+ return ret;
+ }
+
+ priv->ds = devm_kzalloc(dev, sizeof(*priv->ds), GFP_KERNEL);
+ if (!priv->ds)
+ return -ENOMEM;
+
+ priv->ds->dev = dev;
+ priv->ds->num_ports = priv->num_ports;
+ priv->ds->priv = priv;
+
+ priv->ds->ops = var->ds_ops_smi;
+ ret = dsa_register_switch(priv->ds);
+ if (ret) {
+ dev_err_probe(dev, ret, "unable to register switch\n");
+ return ret;
+ }
+ return 0;
+}
+
+static int realtek_smi_remove(struct platform_device *pdev)
+{
+ struct realtek_priv *priv = platform_get_drvdata(pdev);
+
+ if (!priv)
+ return 0;
+
+ dsa_unregister_switch(priv->ds);
+ if (priv->slave_mii_bus)
+ of_node_put(priv->slave_mii_bus->dev.of_node);
+
+ /* leave the device reset asserted */
+ if (priv->reset)
+ gpiod_set_value(priv->reset, 1);
+
+ return 0;
+}
+
+static void realtek_smi_shutdown(struct platform_device *pdev)
+{
+ struct realtek_priv *priv = platform_get_drvdata(pdev);
+
+ if (!priv)
+ return;
+
+ dsa_switch_shutdown(priv->ds);
+
+ platform_set_drvdata(pdev, NULL);
+}
+
+static const struct of_device_id realtek_smi_of_match[] = {
+#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8366RB)
+ {
+ .compatible = "realtek,rtl8366rb",
+ .data = &rtl8366rb_variant,
+ },
+#endif
+#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8365MB)
+ {
+ .compatible = "realtek,rtl8365mb",
+ .data = &rtl8365mb_variant,
+ },
+#endif
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, realtek_smi_of_match);
+
+static struct platform_driver realtek_smi_driver = {
+ .driver = {
+ .name = "realtek-smi",
+ .of_match_table = of_match_ptr(realtek_smi_of_match),
+ },
+ .probe = realtek_smi_probe,
+ .remove = realtek_smi_remove,
+ .shutdown = realtek_smi_shutdown,
+};
+module_platform_driver(realtek_smi_driver);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
+MODULE_DESCRIPTION("Driver for Realtek ethernet switch connected via SMI interface");
+MODULE_LICENSE("GPL");