[PATCH 1/7] net: dsa: add new driver for ar8xxx family
From: Mathieu Olivari
Date: Thu May 28 2015 - 21:43:53 EST
This patch contains initial init & registration code for QCA8337. It
will detect a QCA8337 switch, if present and declared in DT/platform.
Each port will be represented through a standalone net_device interface,
as for other DSA switches. CPU can communicate with any of the ports by
setting an IP@ on ethN interface. Ports cannot communicate with each
other just yet.
Link status will be reported through polling, and we don't use any
encapsulation.
Signed-off-by: Mathieu Olivari <mathieu@xxxxxxxxxxxxxx>
---
drivers/net/dsa/Kconfig | 7 ++
drivers/net/dsa/Makefile | 1 +
drivers/net/dsa/ar8xxx.c | 303 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/net/dsa/ar8xxx.h | 82 +++++++++++++
net/dsa/dsa.c | 1 +
5 files changed, 394 insertions(+)
create mode 100644 drivers/net/dsa/ar8xxx.c
create mode 100644 drivers/net/dsa/ar8xxx.h
diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig
index 7ad0a4d..2aae541 100644
--- a/drivers/net/dsa/Kconfig
+++ b/drivers/net/dsa/Kconfig
@@ -65,4 +65,11 @@ config NET_DSA_BCM_SF2
This enables support for the Broadcom Starfighter 2 Ethernet
switch chips.
+config NET_DSA_AR8XXX
+ tristate "Qualcomm Atheros AR8XXX Ethernet switch family support"
+ depends on NET_DSA
+ ---help---
+ This enables support for the Qualcomm Atheros AR8XXX Ethernet
+ switch chips.
+
endmenu
diff --git a/drivers/net/dsa/Makefile b/drivers/net/dsa/Makefile
index e2d51c4..7647687 100644
--- a/drivers/net/dsa/Makefile
+++ b/drivers/net/dsa/Makefile
@@ -14,3 +14,4 @@ ifdef CONFIG_NET_DSA_MV88E6171
mv88e6xxx_drv-y += mv88e6171.o
endif
obj-$(CONFIG_NET_DSA_BCM_SF2) += bcm_sf2.o
+obj-$(CONFIG_NET_DSA_AR8XXX) += ar8xxx.o
diff --git a/drivers/net/dsa/ar8xxx.c b/drivers/net/dsa/ar8xxx.c
new file mode 100644
index 0000000..4ce3ffc
--- /dev/null
+++ b/drivers/net/dsa/ar8xxx.c
@@ -0,0 +1,303 @@
+/*
+ * Copyright (C) 2009 Felix Fietkau <nbd@xxxxxxxxxxx>
+ * Copyright (C) 2011-2012 Gabor Juhos <juhosg@xxxxxxxxxxx>
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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/module.h>
+#include <linux/phy.h>
+#include <linux/netdevice.h>
+#include <net/dsa.h>
+#include <linux/phy.h>
+#include <linux/of_net.h>
+
+#include "ar8xxx.h"
+
+u32
+ar8xxx_mii_read32(struct mii_bus *bus, int phy_id, int regnum)
+{
+ u16 lo, hi;
+
+ lo = bus->read(bus, phy_id, regnum);
+ hi = bus->read(bus, phy_id, regnum + 1);
+
+ return (hi << 16) | lo;
+}
+
+void
+ar8xxx_mii_write32(struct mii_bus *bus, int phy_id, int regnum, u32 val)
+{
+ u16 lo, hi;
+
+ lo = val & 0xffff;
+ hi = (u16)(val >> 16);
+
+ bus->write(bus, phy_id, regnum, lo);
+ bus->write(bus, phy_id, regnum + 1, hi);
+}
+
+u32 ar8xxx_read(struct dsa_switch *ds, int reg)
+{
+ struct mii_bus *bus = dsa_host_dev_to_mii_bus(ds->master_dev);
+ u16 r1, r2, page;
+ u32 val;
+
+ split_addr((u32)reg, &r1, &r2, &page);
+
+ mutex_lock(&bus->mdio_lock);
+
+ bus->write(bus, 0x18, 0, page);
+ wait_for_page_switch();
+ val = ar8xxx_mii_read32(bus, 0x10 | r2, r1);
+
+ mutex_unlock(&bus->mdio_lock);
+
+ return val;
+}
+
+void ar8xxx_write(struct dsa_switch *ds, int reg, u32 val)
+{
+ struct mii_bus *bus = dsa_host_dev_to_mii_bus(ds->master_dev);
+ u16 r1, r2, page;
+
+ split_addr((u32)reg, &r1, &r2, &page);
+
+ mutex_lock(&bus->mdio_lock);
+
+ bus->write(bus, 0x18, 0, page);
+ wait_for_page_switch();
+ ar8xxx_mii_write32(bus, 0x10 | r2, r1, val);
+
+ mutex_unlock(&bus->mdio_lock);
+}
+
+u32
+ar8xxx_rmw(struct dsa_switch *ds, int reg, u32 mask, u32 val)
+{
+ struct mii_bus *bus = dsa_host_dev_to_mii_bus(ds->master_dev);
+ u16 r1, r2, page;
+ u32 ret;
+
+ split_addr((u32)reg, &r1, &r2, &page);
+
+ mutex_lock(&bus->mdio_lock);
+
+ bus->write(bus, 0x18, 0, page);
+ wait_for_page_switch();
+
+ ret = ar8xxx_mii_read32(bus, 0x10 | r2, r1);
+ ret &= ~mask;
+ ret |= val;
+ ar8xxx_mii_write32(bus, 0x10 | r2, r1, ret);
+
+ mutex_unlock(&bus->mdio_lock);
+
+ return ret;
+}
+
+static char *ar8xxx_probe(struct device *host_dev, int sw_addr)
+{
+ struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
+ u32 phy_id;
+
+ if (!bus)
+ return NULL;
+
+ /* sw_addr is irrelevant as the switch occupies the MDIO bus from
+ * addresses 0 to 4 (PHYs) and 16-23 (for MDIO 32bits protocol). So
+ * we'll probe address 0 to see if we see the right switch family.
+ */
+ phy_id = mdiobus_read(bus, 0, MII_PHYSID1) << 16;
+ phy_id |= mdiobus_read(bus, 0, MII_PHYSID2);
+
+ switch (phy_id) {
+ case PHY_ID_QCA8337:
+ return "QCA8337";
+ default:
+ return NULL;
+ }
+}
+
+static int ar8xxx_set_pad_ctrl(struct dsa_switch *ds, int port, int mode)
+{
+ int reg;
+
+ switch (port) {
+ case 0:
+ reg = AR8327_REG_PORT0_PAD_CTRL;
+ break;
+ case 6:
+ reg = AR8327_REG_PORT6_PAD_CTRL;
+ break;
+ default:
+ pr_err("Can't set PAD_CTRL on port %d\n", port);
+ return -EINVAL;
+ }
+
+ /* DSA only supports 1 CPU port for now, so we'll take the assumption
+ * that P0 is connected to the CPU master_dev.
+ */
+ switch (mode) {
+ case PHY_INTERFACE_MODE_RGMII:
+ ar8xxx_write(ds, reg,
+ AR8327_PORT_PAD_RGMII_EN |
+ AR8327_PORT_PAD_RGMII_TX_DELAY(3) |
+ AR8327_PORT_PAD_RGMII_RX_DELAY(3));
+
+ /* According to the datasheet, RGMII delay is enabled through
+ * PORT5_PAD_CTRL for all ports, rather than individual port
+ * registers
+ */
+ ar8xxx_write(ds, AR8327_REG_PORT5_PAD_CTRL,
+ AR8327_PORT_PAD_RGMII_RX_DELAY_EN);
+ break;
+ default:
+ pr_err("xMII mode %d not supported\n", mode);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ar8xxx_setup(struct dsa_switch *ds)
+{
+ struct net_device *netdev = ds->dst->pd->of_netdev;
+ int ret, i, phy_mode;
+
+ /* Initialize CPU port pad mode (xMII type, delays...) */
+ phy_mode = of_get_phy_mode(netdev->dev.parent->of_node);
+ if (phy_mode < 0) {
+ pr_err("Can't find phy-mode for master device\n");
+ return phy_mode;
+ }
+
+ ret = ar8xxx_set_pad_ctrl(ds, 0, phy_mode);
+ if (ret < 0)
+ return ret;
+
+ /* Disable forwarding by default on all ports */
+ for (i = 0; i < AR8327_NUM_PORTS; i++)
+ ar8xxx_rmw(ds, AR8327_PORT_LOOKUP_CTRL(i),
+ AR8327_PORT_LOOKUP_MEMBER, 0);
+
+ /* Setup connection between CPU ports & PHYs */
+ for (i = 0; i < DSA_MAX_PORTS; i++) {
+ /* CPU port gets connected to all PHYs in the switch */
+ if (dsa_is_cpu_port(ds, i)) {
+ ar8xxx_rmw(ds, AR8327_PORT_LOOKUP_CTRL(0),
+ AR8327_PORT_LOOKUP_MEMBER,
+ ds->phys_port_mask << 1);
+ }
+
+ /* Invividual PHYs gets connected to CPU port only */
+ if (ds->phys_port_mask & BIT(i)) {
+ ar8xxx_rmw(ds, AR8327_PORT_LOOKUP_CTRL(phy_to_port(i)),
+ AR8327_PORT_LOOKUP_MEMBER, BIT(0));
+ }
+ }
+
+ return 0;
+}
+
+static int ar8xxx_set_addr(struct dsa_switch *ds, u8 *addr)
+{
+ return 0;
+}
+
+static int ar8xxx_phy_read(struct dsa_switch *ds, int phy, int regnum)
+{
+ struct mii_bus *bus = dsa_host_dev_to_mii_bus(ds->master_dev);
+
+ return mdiobus_read(bus, phy, regnum);
+}
+
+static int
+ar8xxx_phy_write(struct dsa_switch *ds, int phy, int regnum, u16 val)
+{
+ struct mii_bus *bus = dsa_host_dev_to_mii_bus(ds->master_dev);
+
+ return mdiobus_write(bus, phy, regnum, val);
+}
+
+static void ar8xxx_poll_link(struct dsa_switch *ds)
+{
+ int i = 0;
+ struct net_device *dev;
+
+ while ((dev = ds->ports[i++]) != NULL) {
+ u32 status;
+ int link;
+ int speed;
+ int duplex;
+
+ status = ar8xxx_read(ds, AR8327_REG_PORT_STATUS(i));
+ link = !!(status & AR8XXX_PORT_STATUS_LINK_UP);
+ duplex = !!(status & AR8XXX_PORT_STATUS_DUPLEX);
+
+ switch (status & AR8XXX_PORT_STATUS_SPEED) {
+ case AR8XXX_PORT_SPEED_10M:
+ speed = 10;
+ break;
+ case AR8XXX_PORT_SPEED_100M:
+ speed = 100;
+ break;
+ case AR8XXX_PORT_SPEED_1000M:
+ speed = 1000;
+ break;
+ default:
+ speed = 0;
+ }
+
+ if (!link) {
+ /* This poll happens every ~1s, so we don't want to
+ * print the status every time. Only when the device
+ * transitions from Link UP to Link DOWN
+ */
+ if (netif_carrier_ok(dev))
+ netif_carrier_off(dev);
+ continue;
+ } else {
+ /* Same thing here. But we detect a Link UP event */
+ if (!netif_carrier_ok(dev))
+ netif_carrier_on(dev);
+ continue;
+ }
+ }
+}
+
+static struct dsa_switch_driver ar8xxx_switch_driver = {
+ .tag_protocol = DSA_TAG_PROTO_NONE,
+ .probe = ar8xxx_probe,
+ .setup = ar8xxx_setup,
+ .set_addr = ar8xxx_set_addr,
+ .poll_link = ar8xxx_poll_link,
+ .phy_read = ar8xxx_phy_read,
+ .phy_write = ar8xxx_phy_write,
+};
+
+static int __init ar8xxx_init(void)
+{
+ register_switch_driver(&ar8xxx_switch_driver);
+ return 0;
+}
+module_init(ar8xxx_init);
+
+static void __exit ar8xxx_cleanup(void)
+{
+ unregister_switch_driver(&ar8xxx_switch_driver);
+}
+module_exit(ar8xxx_cleanup);
+
+MODULE_AUTHOR("Mathieu Olivari <mathieu@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Driver for AR8XXX ethernet switch family");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ar8xxx");
diff --git a/drivers/net/dsa/ar8xxx.h b/drivers/net/dsa/ar8xxx.h
new file mode 100644
index 0000000..a29b6d3
--- /dev/null
+++ b/drivers/net/dsa/ar8xxx.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2009 Felix Fietkau <nbd@xxxxxxxxxxx>
+ * Copyright (C) 2011-2012 Gabor Juhos <juhosg@xxxxxxxxxxx>
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ */
+
+#ifndef __AR8XXX_H
+#define __AR8XXX_H
+
+#include <linux/delay.h>
+
+#define AR8327_NUM_PORTS 7
+
+#define PHY_ID_QCA8337 0x004dd036
+
+#define AR8327_REG_PORT0_PAD_CTRL 0x004
+#define AR8327_REG_PORT5_PAD_CTRL 0x008
+#define AR8327_REG_PORT6_PAD_CTRL 0x00c
+#define AR8327_PORT_PAD_RGMII_EN BIT(26)
+#define AR8327_PORT_PAD_RGMII_TX_DELAY(x) ((0x8 + (x & 0x3)) << 22)
+#define AR8327_PORT_PAD_RGMII_RX_DELAY(x) ((0x10 + (x & 0x3)) << 20)
+#define AR8327_PORT_PAD_RGMII_RX_DELAY_EN BIT(24)
+#define AR8327_PORT_PAD_SGMII_EN BIT(7)
+
+#define AR8327_REG_PORT_STATUS(_i) (0x07c + (_i) * 4)
+#define AR8XXX_PORT_STATUS_SPEED GENMASK(2, 0)
+#define AR8XXX_PORT_STATUS_SPEED_S 0
+#define AR8XXX_PORT_STATUS_TXMAC BIT(2)
+#define AR8XXX_PORT_STATUS_RXMAC BIT(3)
+#define AR8XXX_PORT_STATUS_TXFLOW BIT(4)
+#define AR8XXX_PORT_STATUS_RXFLOW BIT(5)
+#define AR8XXX_PORT_STATUS_DUPLEX BIT(6)
+#define AR8XXX_PORT_STATUS_LINK_UP BIT(8)
+#define AR8XXX_PORT_STATUS_LINK_AUTO BIT(9)
+#define AR8XXX_PORT_STATUS_LINK_PAUSE BIT(10)
+
+#define AR8327_PORT_LOOKUP_CTRL(_i) (0x660 + (_i) * 0xc)
+#define AR8327_PORT_LOOKUP_MEMBER GENMASK(6, 0)
+#define AR8327_PORT_LOOKUP_IN_MODE GENMASK(9, 8)
+#define AR8327_PORT_LOOKUP_IN_MODE_S 8
+#define AR8327_PORT_LOOKUP_STATE GENMASK(18, 16)
+#define AR8327_PORT_LOOKUP_STATE_S 16
+#define AR8327_PORT_LOOKUP_LEARN BIT(20)
+#define AR8327_PORT_LOOKUP_ING_MIRROR_EN BIT(25)
+
+/* port speed */
+enum {
+ AR8XXX_PORT_SPEED_10M = 0,
+ AR8XXX_PORT_SPEED_100M = 1,
+ AR8XXX_PORT_SPEED_1000M = 2,
+ AR8XXX_PORT_SPEED_ERR = 3,
+};
+
+static inline void
+split_addr(u32 regaddr, u16 *r1, u16 *r2, u16 *page)
+{
+ regaddr >>= 1;
+ *r1 = regaddr & 0x1e;
+
+ regaddr >>= 5;
+ *r2 = regaddr & 0x7;
+
+ regaddr >>= 3;
+ *page = regaddr & 0x1ff;
+}
+
+static inline void
+wait_for_page_switch(void)
+{
+ udelay(5);
+}
+
+#endif /* __AR8XXX_H */
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index e6f6cc3..fffb9aa 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -893,6 +893,7 @@ static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
static const struct of_device_id dsa_of_match_table[] = {
{ .compatible = "brcm,bcm7445-switch-v4.0" },
+ { .compatible = "qca,ar8xxx", },
{ .compatible = "marvell,dsa", },
{}
};
--
2.1.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/