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path: root/drivers/net/dsa/realtek-smi-core.c
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Diffstat (limited to 'drivers/net/dsa/realtek-smi-core.c')
-rw-r--r--drivers/net/dsa/realtek-smi-core.c523
1 files changed, 0 insertions, 523 deletions
diff --git a/drivers/net/dsa/realtek-smi-core.c b/drivers/net/dsa/realtek-smi-core.c
deleted file mode 100644
index aae46ada8d83..000000000000
--- a/drivers/net/dsa/realtek-smi-core.c
+++ /dev/null
@@ -1,523 +0,0 @@
-// 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-smi-core.h"
-
-#define REALTEK_SMI_ACK_RETRY_COUNT 5
-#define REALTEK_SMI_HW_STOP_DELAY 25 /* msecs */
-#define REALTEK_SMI_HW_START_DELAY 100 /* msecs */
-
-static inline void realtek_smi_clk_delay(struct realtek_smi *smi)
-{
- ndelay(smi->clk_delay);
-}
-
-static void realtek_smi_start(struct realtek_smi *smi)
-{
- /* Set GPIO pins to output mode, with initial state:
- * SCK = 0, SDA = 1
- */
- gpiod_direction_output(smi->mdc, 0);
- gpiod_direction_output(smi->mdio, 1);
- realtek_smi_clk_delay(smi);
-
- /* CLK 1: 0 -> 1, 1 -> 0 */
- gpiod_set_value(smi->mdc, 1);
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdc, 0);
- realtek_smi_clk_delay(smi);
-
- /* CLK 2: */
- gpiod_set_value(smi->mdc, 1);
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdio, 0);
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdc, 0);
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdio, 1);
-}
-
-static void realtek_smi_stop(struct realtek_smi *smi)
-{
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdio, 0);
- gpiod_set_value(smi->mdc, 1);
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdio, 1);
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdc, 1);
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdc, 0);
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdc, 1);
-
- /* Add a click */
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdc, 0);
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdc, 1);
-
- /* Set GPIO pins to input mode */
- gpiod_direction_input(smi->mdio);
- gpiod_direction_input(smi->mdc);
-}
-
-static void realtek_smi_write_bits(struct realtek_smi *smi, u32 data, u32 len)
-{
- for (; len > 0; len--) {
- realtek_smi_clk_delay(smi);
-
- /* Prepare data */
- gpiod_set_value(smi->mdio, !!(data & (1 << (len - 1))));
- realtek_smi_clk_delay(smi);
-
- /* Clocking */
- gpiod_set_value(smi->mdc, 1);
- realtek_smi_clk_delay(smi);
- gpiod_set_value(smi->mdc, 0);
- }
-}
-
-static void realtek_smi_read_bits(struct realtek_smi *smi, u32 len, u32 *data)
-{
- gpiod_direction_input(smi->mdio);
-
- for (*data = 0; len > 0; len--) {
- u32 u;
-
- realtek_smi_clk_delay(smi);
-
- /* Clocking */
- gpiod_set_value(smi->mdc, 1);
- realtek_smi_clk_delay(smi);
- u = !!gpiod_get_value(smi->mdio);
- gpiod_set_value(smi->mdc, 0);
-
- *data |= (u << (len - 1));
- }
-
- gpiod_direction_output(smi->mdio, 0);
-}
-
-static int realtek_smi_wait_for_ack(struct realtek_smi *smi)
-{
- int retry_cnt;
-
- retry_cnt = 0;
- do {
- u32 ack;
-
- realtek_smi_read_bits(smi, 1, &ack);
- if (ack == 0)
- break;
-
- if (++retry_cnt > REALTEK_SMI_ACK_RETRY_COUNT) {
- dev_err(smi->dev, "ACK timeout\n");
- return -ETIMEDOUT;
- }
- } while (1);
-
- return 0;
-}
-
-static int realtek_smi_write_byte(struct realtek_smi *smi, u8 data)
-{
- realtek_smi_write_bits(smi, data, 8);
- return realtek_smi_wait_for_ack(smi);
-}
-
-static int realtek_smi_write_byte_noack(struct realtek_smi *smi, u8 data)
-{
- realtek_smi_write_bits(smi, data, 8);
- return 0;
-}
-
-static int realtek_smi_read_byte0(struct realtek_smi *smi, u8 *data)
-{
- u32 t;
-
- /* Read data */
- realtek_smi_read_bits(smi, 8, &t);
- *data = (t & 0xff);
-
- /* Send an ACK */
- realtek_smi_write_bits(smi, 0x00, 1);
-
- return 0;
-}
-
-static int realtek_smi_read_byte1(struct realtek_smi *smi, u8 *data)
-{
- u32 t;
-
- /* Read data */
- realtek_smi_read_bits(smi, 8, &t);
- *data = (t & 0xff);
-
- /* Send an ACK */
- realtek_smi_write_bits(smi, 0x01, 1);
-
- return 0;
-}
-
-static int realtek_smi_read_reg(struct realtek_smi *smi, u32 addr, u32 *data)
-{
- unsigned long flags;
- u8 lo = 0;
- u8 hi = 0;
- int ret;
-
- spin_lock_irqsave(&smi->lock, flags);
-
- realtek_smi_start(smi);
-
- /* Send READ command */
- ret = realtek_smi_write_byte(smi, smi->cmd_read);
- if (ret)
- goto out;
-
- /* Set ADDR[7:0] */
- ret = realtek_smi_write_byte(smi, addr & 0xff);
- if (ret)
- goto out;
-
- /* Set ADDR[15:8] */
- ret = realtek_smi_write_byte(smi, addr >> 8);
- if (ret)
- goto out;
-
- /* Read DATA[7:0] */
- realtek_smi_read_byte0(smi, &lo);
- /* Read DATA[15:8] */
- realtek_smi_read_byte1(smi, &hi);
-
- *data = ((u32)lo) | (((u32)hi) << 8);
-
- ret = 0;
-
- out:
- realtek_smi_stop(smi);
- spin_unlock_irqrestore(&smi->lock, flags);
-
- return ret;
-}
-
-static int realtek_smi_write_reg(struct realtek_smi *smi,
- u32 addr, u32 data, bool ack)
-{
- unsigned long flags;
- int ret;
-
- spin_lock_irqsave(&smi->lock, flags);
-
- realtek_smi_start(smi);
-
- /* Send WRITE command */
- ret = realtek_smi_write_byte(smi, smi->cmd_write);
- if (ret)
- goto out;
-
- /* Set ADDR[7:0] */
- ret = realtek_smi_write_byte(smi, addr & 0xff);
- if (ret)
- goto out;
-
- /* Set ADDR[15:8] */
- ret = realtek_smi_write_byte(smi, addr >> 8);
- if (ret)
- goto out;
-
- /* Write DATA[7:0] */
- ret = realtek_smi_write_byte(smi, data & 0xff);
- if (ret)
- goto out;
-
- /* Write DATA[15:8] */
- if (ack)
- ret = realtek_smi_write_byte(smi, data >> 8);
- else
- ret = realtek_smi_write_byte_noack(smi, data >> 8);
- if (ret)
- goto out;
-
- ret = 0;
-
- out:
- realtek_smi_stop(smi);
- spin_unlock_irqrestore(&smi->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.
- */
-int realtek_smi_write_reg_noack(struct realtek_smi *smi, u32 addr,
- u32 data)
-{
- return realtek_smi_write_reg(smi, addr, data, false);
-}
-EXPORT_SYMBOL_GPL(realtek_smi_write_reg_noack);
-
-/* Regmap accessors */
-
-static int realtek_smi_write(void *ctx, u32 reg, u32 val)
-{
- struct realtek_smi *smi = ctx;
-
- return realtek_smi_write_reg(smi, reg, val, true);
-}
-
-static int realtek_smi_read(void *ctx, u32 reg, u32 *val)
-{
- struct realtek_smi *smi = ctx;
-
- return realtek_smi_read_reg(smi, reg, val);
-}
-
-static const struct regmap_config realtek_smi_mdio_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,
-};
-
-static int realtek_smi_mdio_read(struct mii_bus *bus, int addr, int regnum)
-{
- struct realtek_smi *smi = bus->priv;
-
- return smi->ops->phy_read(smi, addr, regnum);
-}
-
-static int realtek_smi_mdio_write(struct mii_bus *bus, int addr, int regnum,
- u16 val)
-{
- struct realtek_smi *smi = bus->priv;
-
- return smi->ops->phy_write(smi, addr, regnum, val);
-}
-
-int realtek_smi_setup_mdio(struct realtek_smi *smi)
-{
- struct device_node *mdio_np;
- int ret;
-
- mdio_np = of_get_compatible_child(smi->dev->of_node, "realtek,smi-mdio");
- if (!mdio_np) {
- dev_err(smi->dev, "no MDIO bus node\n");
- return -ENODEV;
- }
-
- smi->slave_mii_bus = devm_mdiobus_alloc(smi->dev);
- if (!smi->slave_mii_bus) {
- ret = -ENOMEM;
- goto err_put_node;
- }
- smi->slave_mii_bus->priv = smi;
- smi->slave_mii_bus->name = "SMI slave MII";
- smi->slave_mii_bus->read = realtek_smi_mdio_read;
- smi->slave_mii_bus->write = realtek_smi_mdio_write;
- snprintf(smi->slave_mii_bus->id, MII_BUS_ID_SIZE, "SMI-%d",
- smi->ds->index);
- smi->slave_mii_bus->dev.of_node = mdio_np;
- smi->slave_mii_bus->parent = smi->dev;
- smi->ds->slave_mii_bus = smi->slave_mii_bus;
-
- ret = devm_of_mdiobus_register(smi->dev, smi->slave_mii_bus, mdio_np);
- if (ret) {
- dev_err(smi->dev, "unable to register MDIO bus %s\n",
- smi->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_smi_variant *var;
- struct device *dev = &pdev->dev;
- struct realtek_smi *smi;
- struct device_node *np;
- int ret;
-
- var = of_device_get_match_data(dev);
- np = dev->of_node;
-
- smi = devm_kzalloc(dev, sizeof(*smi) + var->chip_data_sz, GFP_KERNEL);
- if (!smi)
- return -ENOMEM;
- smi->chip_data = (void *)smi + sizeof(*smi);
- smi->map = devm_regmap_init(dev, NULL, smi,
- &realtek_smi_mdio_regmap_config);
- if (IS_ERR(smi->map)) {
- ret = PTR_ERR(smi->map);
- dev_err(dev, "regmap init failed: %d\n", ret);
- return ret;
- }
-
- /* Link forward and backward */
- smi->dev = dev;
- smi->clk_delay = var->clk_delay;
- smi->cmd_read = var->cmd_read;
- smi->cmd_write = var->cmd_write;
- smi->ops = var->ops;
-
- dev_set_drvdata(dev, smi);
- spin_lock_init(&smi->lock);
-
- /* TODO: if power is software controlled, set up any regulators here */
-
- /* Assert then deassert RESET */
- smi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
- if (IS_ERR(smi->reset)) {
- dev_err(dev, "failed to get RESET GPIO\n");
- return PTR_ERR(smi->reset);
- }
- msleep(REALTEK_SMI_HW_STOP_DELAY);
- gpiod_set_value(smi->reset, 0);
- msleep(REALTEK_SMI_HW_START_DELAY);
- dev_info(dev, "deasserted RESET\n");
-
- /* Fetch MDIO pins */
- smi->mdc = devm_gpiod_get_optional(dev, "mdc", GPIOD_OUT_LOW);
- if (IS_ERR(smi->mdc))
- return PTR_ERR(smi->mdc);
- smi->mdio = devm_gpiod_get_optional(dev, "mdio", GPIOD_OUT_LOW);
- if (IS_ERR(smi->mdio))
- return PTR_ERR(smi->mdio);
-
- smi->leds_disabled = of_property_read_bool(np, "realtek,disable-leds");
-
- ret = smi->ops->detect(smi);
- if (ret) {
- dev_err(dev, "unable to detect switch\n");
- return ret;
- }
-
- smi->ds = devm_kzalloc(dev, sizeof(*smi->ds), GFP_KERNEL);
- if (!smi->ds)
- return -ENOMEM;
-
- smi->ds->dev = dev;
- smi->ds->num_ports = smi->num_ports;
- smi->ds->priv = smi;
-
- smi->ds->ops = var->ds_ops;
- ret = dsa_register_switch(smi->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_smi *smi = platform_get_drvdata(pdev);
-
- if (!smi)
- return 0;
-
- dsa_unregister_switch(smi->ds);
- if (smi->slave_mii_bus)
- of_node_put(smi->slave_mii_bus->dev.of_node);
- gpiod_set_value(smi->reset, 1);
-
- platform_set_drvdata(pdev, NULL);
-
- return 0;
-}
-
-static void realtek_smi_shutdown(struct platform_device *pdev)
-{
- struct realtek_smi *smi = platform_get_drvdata(pdev);
-
- if (!smi)
- return;
-
- dsa_switch_shutdown(smi->ds);
-
- platform_set_drvdata(pdev, NULL);
-}
-
-static const struct of_device_id realtek_smi_of_match[] = {
- {
- .compatible = "realtek,rtl8366rb",
- .data = &rtl8366rb_variant,
- },
- {
- /* FIXME: add support for RTL8366S and more */
- .compatible = "realtek,rtl8366s",
- .data = NULL,
- },
- {
- .compatible = "realtek,rtl8365mb",
- .data = &rtl8365mb_variant,
- },
- { /* 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_LICENSE("GPL");
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