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openwrt/target/linux/ramips/patches-4.4/0503-net-next-mediatek-add-switch-driver-for-mt7620.patch
Felix Fietkau 728ab77d3d ramips: fix polling switch interrupts 
Signed-off-by: Felix Fietkau <nbd@nbd.name>
2016-11-14 20:06:15 +01:00

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From 322a9598692943961791ac6e5a3f385b379dcdc3 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Mon, 14 Dec 2015 21:23:18 +0100
Subject: [PATCH 503/513] net-next: mediatek: add switch driver for mt7620
This driver is very basic and only provides basic init and irq support.
Switchdev support for this device will follow.
Signed-off-by: John Crispin <blogic@openwrt.org>
---
drivers/net/ethernet/mediatek/gsw_mt7620.c | 255 ++++++++++++++++++++++++++++
drivers/net/ethernet/mediatek/gsw_mt7620.h | 117 +++++++++++++
2 files changed, 372 insertions(+)
create mode 100644 drivers/net/ethernet/mediatek/gsw_mt7620.c
create mode 100644 drivers/net/ethernet/mediatek/gsw_mt7620.h
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/gsw_mt7620.c
@@ -0,0 +1,255 @@
+/* This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License
+ *
+ * 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.
+ *
+ * Copyright (C) 2009-2015 John Crispin <blogic@openwrt.org>
+ * Copyright (C) 2009-2015 Felix Fietkau <nbd@nbd.name>
+ * Copyright (C) 2013-2015 Michael Lee <igvtee@gmail.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+
+#include <ralink_regs.h>
+
+#include "mtk_eth_soc.h"
+#include "gsw_mt7620.h"
+
+void mtk_switch_w32(struct mt7620_gsw *gsw, u32 val, unsigned reg)
+{
+ iowrite32(val, gsw->base + reg);
+}
+
+u32 mtk_switch_r32(struct mt7620_gsw *gsw, unsigned reg)
+{
+ return ioread32(gsw->base + reg);
+}
+
+static irqreturn_t gsw_interrupt_mt7620(int irq, void *_priv)
+{
+ struct fe_priv *priv = (struct fe_priv *)_priv;
+ struct mt7620_gsw *gsw = (struct mt7620_gsw *)priv->soc->swpriv;
+ u32 status;
+ int i, max = (gsw->port4 == PORT4_EPHY) ? (4) : (3);
+
+ status = mtk_switch_r32(gsw, GSW_REG_ISR);
+ if (status & PORT_IRQ_ST_CHG)
+ for (i = 0; i <= max; i++) {
+ u32 status = mtk_switch_r32(gsw, GSW_REG_PORT_STATUS(i));
+ int link = status & 0x1;
+
+ if (link != priv->link[i])
+ mt7620_print_link_state(priv, i, link,
+ (status >> 2) & 3,
+ (status & 0x2));
+
+ priv->link[i] = link;
+ }
+ mtk_switch_w32(gsw, status, GSW_REG_ISR);
+
+ return IRQ_HANDLED;
+}
+
+static void mt7620_hw_init(struct mt7620_gsw *gsw, struct device_node *np)
+{
+ u32 is_BGA = (rt_sysc_r32(0x0c) >> 16) & 1;
+
+ rt_sysc_w32(rt_sysc_r32(SYSC_REG_CFG1) | BIT(8), SYSC_REG_CFG1);
+ mtk_switch_w32(gsw, mtk_switch_r32(gsw, GSW_REG_CKGCR) & ~(0x3 << 4), GSW_REG_CKGCR);
+
+ if (of_property_read_bool(np, "mediatek,mt7530")) {
+ u32 val;
+
+ /* turn off ephy and set phy base addr to 12 */
+ mtk_switch_w32(gsw, mtk_switch_r32(gsw, GSW_REG_GPC1) |
+ (0x1f << 24) | (0xc << 16),
+ GSW_REG_GPC1);
+
+ /* set MT7530 central align */
+ val = mt7530_mdio_r32(gsw, 0x7830);
+ val &= ~BIT(0);
+ val |= BIT(1);
+ mt7530_mdio_w32(gsw, 0x7830, val);
+
+ val = mt7530_mdio_r32(gsw, 0x7a40);
+ val &= ~BIT(30);
+ mt7530_mdio_w32(gsw, 0x7a40, val);
+
+ mt7530_mdio_w32(gsw, 0x7a78, 0x855);
+ } else {
+ /* global page 4 */
+ _mt7620_mii_write(gsw, 1, 31, 0x4000);
+
+ _mt7620_mii_write(gsw, 1, 17, 0x7444);
+ if (is_BGA)
+ _mt7620_mii_write(gsw, 1, 19, 0x0114);
+ else
+ _mt7620_mii_write(gsw, 1, 19, 0x0117);
+
+ _mt7620_mii_write(gsw, 1, 22, 0x10cf);
+ _mt7620_mii_write(gsw, 1, 25, 0x6212);
+ _mt7620_mii_write(gsw, 1, 26, 0x0777);
+ _mt7620_mii_write(gsw, 1, 29, 0x4000);
+ _mt7620_mii_write(gsw, 1, 28, 0xc077);
+ _mt7620_mii_write(gsw, 1, 24, 0x0000);
+
+ /* global page 3 */
+ _mt7620_mii_write(gsw, 1, 31, 0x3000);
+ _mt7620_mii_write(gsw, 1, 17, 0x4838);
+
+ /* global page 2 */
+ _mt7620_mii_write(gsw, 1, 31, 0x2000);
+ if (is_BGA) {
+ _mt7620_mii_write(gsw, 1, 21, 0x0515);
+ _mt7620_mii_write(gsw, 1, 22, 0x0053);
+ _mt7620_mii_write(gsw, 1, 23, 0x00bf);
+ _mt7620_mii_write(gsw, 1, 24, 0x0aaf);
+ _mt7620_mii_write(gsw, 1, 25, 0x0fad);
+ _mt7620_mii_write(gsw, 1, 26, 0x0fc1);
+ } else {
+ _mt7620_mii_write(gsw, 1, 21, 0x0517);
+ _mt7620_mii_write(gsw, 1, 22, 0x0fd2);
+ _mt7620_mii_write(gsw, 1, 23, 0x00bf);
+ _mt7620_mii_write(gsw, 1, 24, 0x0aab);
+ _mt7620_mii_write(gsw, 1, 25, 0x00ae);
+ _mt7620_mii_write(gsw, 1, 26, 0x0fff);
+ }
+ /* global page 1 */
+ _mt7620_mii_write(gsw, 1, 31, 0x1000);
+ _mt7620_mii_write(gsw, 1, 17, 0xe7f8);
+ }
+
+ /* global page 0 */
+ _mt7620_mii_write(gsw, 1, 31, 0x8000);
+ _mt7620_mii_write(gsw, 0, 30, 0xa000);
+ _mt7620_mii_write(gsw, 1, 30, 0xa000);
+ _mt7620_mii_write(gsw, 2, 30, 0xa000);
+ _mt7620_mii_write(gsw, 3, 30, 0xa000);
+
+ _mt7620_mii_write(gsw, 0, 4, 0x05e1);
+ _mt7620_mii_write(gsw, 1, 4, 0x05e1);
+ _mt7620_mii_write(gsw, 2, 4, 0x05e1);
+ _mt7620_mii_write(gsw, 3, 4, 0x05e1);
+
+ /* global page 2 */
+ _mt7620_mii_write(gsw, 1, 31, 0xa000);
+ _mt7620_mii_write(gsw, 0, 16, 0x1111);
+ _mt7620_mii_write(gsw, 1, 16, 0x1010);
+ _mt7620_mii_write(gsw, 2, 16, 0x1515);
+ _mt7620_mii_write(gsw, 3, 16, 0x0f0f);
+
+ /* CPU Port6 Force Link 1G, FC ON */
+ mtk_switch_w32(gsw, 0x5e33b, GSW_REG_PORT_PMCR(6));
+
+ /* Set Port 6 as CPU Port */
+ mtk_switch_w32(gsw, 0x7f7f7fe0, 0x0010);
+
+ /* setup port 4 */
+ if (gsw->port4 == PORT4_EPHY) {
+ u32 val = rt_sysc_r32(SYSC_REG_CFG1);
+
+ val |= 3 << 14;
+ rt_sysc_w32(val, SYSC_REG_CFG1);
+ _mt7620_mii_write(gsw, 4, 30, 0xa000);
+ _mt7620_mii_write(gsw, 4, 4, 0x05e1);
+ _mt7620_mii_write(gsw, 4, 16, 0x1313);
+ pr_info("gsw: setting port4 to ephy mode\n");
+ }
+}
+
+static const struct of_device_id mediatek_gsw_match[] = {
+ { .compatible = "mediatek,mt7620-gsw" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mediatek_gsw_match);
+
+int mtk_gsw_init(struct fe_priv *priv)
+{
+ struct device_node *np = priv->switch_np;
+ struct platform_device *pdev = of_find_device_by_node(np);
+ struct mt7620_gsw *gsw;
+
+ if (!pdev)
+ return -ENODEV;
+
+ if (!of_device_is_compatible(np, mediatek_gsw_match->compatible))
+ return -EINVAL;
+
+ gsw = platform_get_drvdata(pdev);
+ priv->soc->swpriv = gsw;
+
+ mt7620_hw_init(gsw, np);
+
+ if (gsw->irq) {
+ request_irq(gsw->irq, gsw_interrupt_mt7620, 0,
+ "gsw", priv);
+ mtk_switch_w32(gsw, ~PORT_IRQ_ST_CHG, GSW_REG_IMR);
+ }
+
+ return 0;
+}
+
+static int mt7620_gsw_probe(struct platform_device *pdev)
+{
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ const char *port4 = NULL;
+ struct mt7620_gsw *gsw;
+ struct device_node *np = pdev->dev.of_node;
+
+ gsw = devm_kzalloc(&pdev->dev, sizeof(struct mt7620_gsw), GFP_KERNEL);
+ if (!gsw)
+ return -ENOMEM;
+
+ gsw->base = devm_ioremap_resource(&pdev->dev, res);
+ if (!gsw->base)
+ return -EADDRNOTAVAIL;
+
+ gsw->dev = &pdev->dev;
+
+ of_property_read_string(np, "mediatek,port4", &port4);
+ if (port4 && !strcmp(port4, "ephy"))
+ gsw->port4 = PORT4_EPHY;
+ else if (port4 && !strcmp(port4, "gmac"))
+ gsw->port4 = PORT4_EXT;
+ else
+ gsw->port4 = PORT4_EPHY;
+
+ gsw->irq = platform_get_irq(pdev, 0);
+
+ platform_set_drvdata(pdev, gsw);
+
+ return 0;
+}
+
+static int mt7620_gsw_remove(struct platform_device *pdev)
+{
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver gsw_driver = {
+ .probe = mt7620_gsw_probe,
+ .remove = mt7620_gsw_remove,
+ .driver = {
+ .name = "mt7620-gsw",
+ .owner = THIS_MODULE,
+ .of_match_table = mediatek_gsw_match,
+ },
+};
+
+module_platform_driver(gsw_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION("GBit switch driver for Mediatek MT7620 SoC");
+MODULE_VERSION(MTK_FE_DRV_VERSION);
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/gsw_mt7620.h
@@ -0,0 +1,117 @@
+/* This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License
+ *
+ * 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.
+ *
+ * Copyright (C) 2009-2015 John Crispin <blogic@openwrt.org>
+ * Copyright (C) 2009-2015 Felix Fietkau <nbd@nbd.name>
+ * Copyright (C) 2013-2015 Michael Lee <igvtee@gmail.com>
+ */
+
+#ifndef _RALINK_GSW_MT7620_H__
+#define _RALINK_GSW_MT7620_H__
+
+#define GSW_REG_PHY_TIMEOUT (5 * HZ)
+
+#ifdef CONFIG_SOC_MT7621
+#define MT7620A_GSW_REG_PIAC 0x0004
+#else
+#define MT7620A_GSW_REG_PIAC 0x7004
+#endif
+
+#define GSW_NUM_VLANS 16
+#define GSW_NUM_VIDS 4096
+#define GSW_NUM_PORTS 7
+#define GSW_PORT6 6
+
+#define GSW_MDIO_ACCESS BIT(31)
+#define GSW_MDIO_READ BIT(19)
+#define GSW_MDIO_WRITE BIT(18)
+#define GSW_MDIO_START BIT(16)
+#define GSW_MDIO_ADDR_SHIFT 20
+#define GSW_MDIO_REG_SHIFT 25
+
+#define GSW_REG_PORT_PMCR(x) (0x3000 + (x * 0x100))
+#define GSW_REG_PORT_STATUS(x) (0x3008 + (x * 0x100))
+#define GSW_REG_SMACCR0 0x3fE4
+#define GSW_REG_SMACCR1 0x3fE8
+#define GSW_REG_CKGCR 0x3ff0
+
+#define GSW_REG_IMR 0x7008
+#define GSW_REG_ISR 0x700c
+#define GSW_REG_GPC1 0x7014
+
+#define SYSC_REG_CHIP_REV_ID 0x0c
+#define SYSC_REG_CFG1 0x14
+#define RST_CTRL_MCM BIT(2)
+#define SYSC_PAD_RGMII2_MDIO 0x58
+#define SYSC_GPIO_MODE 0x60
+
+#define PORT_IRQ_ST_CHG 0x7f
+
+#ifdef CONFIG_SOC_MT7621
+#define ESW_PHY_POLLING 0x0000
+#else
+#define ESW_PHY_POLLING 0x7000
+#endif
+
+#define PMCR_IPG BIT(18)
+#define PMCR_MAC_MODE BIT(16)
+#define PMCR_FORCE BIT(15)
+#define PMCR_TX_EN BIT(14)
+#define PMCR_RX_EN BIT(13)
+#define PMCR_BACKOFF BIT(9)
+#define PMCR_BACKPRES BIT(8)
+#define PMCR_RX_FC BIT(5)
+#define PMCR_TX_FC BIT(4)
+#define PMCR_SPEED(_x) (_x << 2)
+#define PMCR_DUPLEX BIT(1)
+#define PMCR_LINK BIT(0)
+
+#define PHY_AN_EN BIT(31)
+#define PHY_PRE_EN BIT(30)
+#define PMY_MDC_CONF(_x) ((_x & 0x3f) << 24)
+
+enum {
+ /* Global attributes. */
+ GSW_ATTR_ENABLE_VLAN,
+ /* Port attributes. */
+ GSW_ATTR_PORT_UNTAG,
+};
+
+enum {
+ PORT4_EPHY = 0,
+ PORT4_EXT,
+};
+
+struct mt7620_gsw {
+ struct device *dev;
+ void __iomem *base;
+ int irq;
+ int port4;
+ unsigned long int autopoll;
+};
+
+void mtk_switch_w32(struct mt7620_gsw *gsw, u32 val, unsigned reg);
+u32 mtk_switch_r32(struct mt7620_gsw *gsw, unsigned reg);
+int mtk_gsw_init(struct fe_priv *priv);
+
+int mt7620_mdio_write(struct mii_bus *bus, int phy_addr, int phy_reg, u16 val);
+int mt7620_mdio_read(struct mii_bus *bus, int phy_addr, int phy_reg);
+void mt7620_mdio_link_adjust(struct fe_priv *priv, int port);
+int mt7620_has_carrier(struct fe_priv *priv);
+void mt7620_print_link_state(struct fe_priv *priv, int port, int link,
+ int speed, int duplex);
+
+void mt7530_mdio_w32(struct mt7620_gsw *gsw, u32 reg, u32 val);
+u32 mt7530_mdio_r32(struct mt7620_gsw *gsw, u32 reg);
+
+u32 _mt7620_mii_write(struct mt7620_gsw *gsw, u32 phy_addr,
+ u32 phy_register, u32 write_data);
+u32 _mt7620_mii_read(struct mt7620_gsw *gsw, int phy_addr, int phy_reg);
+
+#endif
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