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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/*
* Microsemi Ocelot Switch driver
*
* Copyright (c) 2017 Microsemi Corporation
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/skbuff.h>
#include "ocelot.h"
static int ocelot_parse_ifh(u32 *ifh, struct frame_info *info)
{
int i;
u8 llen, wlen;
/* The IFH is in network order, switch to CPU order */
for (i = 0; i < IFH_LEN; i++)
ifh[i] = ntohl((__force __be32)ifh[i]);
wlen = (ifh[1] >> 7) & 0xff;
llen = (ifh[1] >> 15) & 0x3f;
info->len = OCELOT_BUFFER_CELL_SZ * wlen + llen - 80;
info->port = (ifh[2] & GENMASK(14, 11)) >> 11;
info->cpuq = (ifh[3] & GENMASK(27, 20)) >> 20;
info->tag_type = (ifh[3] & GENMASK(16, 16)) >> 16;
info->vid = ifh[3] & GENMASK(11, 0);
return 0;
}
static int ocelot_rx_frame_word(struct ocelot *ocelot, u8 grp, bool ifh,
u32 *rval)
{
u32 val;
u32 bytes_valid;
val = ocelot_read_rix(ocelot, QS_XTR_RD, grp);
if (val == XTR_NOT_READY) {
if (ifh)
return -EIO;
do {
val = ocelot_read_rix(ocelot, QS_XTR_RD, grp);
} while (val == XTR_NOT_READY);
}
switch (val) {
case XTR_ABORT:
return -EIO;
case XTR_EOF_0:
case XTR_EOF_1:
case XTR_EOF_2:
case XTR_EOF_3:
case XTR_PRUNED:
bytes_valid = XTR_VALID_BYTES(val);
val = ocelot_read_rix(ocelot, QS_XTR_RD, grp);
if (val == XTR_ESCAPE)
*rval = ocelot_read_rix(ocelot, QS_XTR_RD, grp);
else
*rval = val;
return bytes_valid;
case XTR_ESCAPE:
*rval = ocelot_read_rix(ocelot, QS_XTR_RD, grp);
return 4;
default:
*rval = val;
return 4;
}
}
static irqreturn_t ocelot_xtr_irq_handler(int irq, void *arg)
{
struct ocelot *ocelot = arg;
int i = 0, grp = 0;
int err = 0;
if (!(ocelot_read(ocelot, QS_XTR_DATA_PRESENT) & BIT(grp)))
return IRQ_NONE;
do {
struct sk_buff *skb;
struct net_device *dev;
u32 *buf;
int sz, len;
u32 ifh[4];
u32 val;
struct frame_info info;
for (i = 0; i < IFH_LEN; i++) {
err = ocelot_rx_frame_word(ocelot, grp, true, &ifh[i]);
if (err != 4)
break;
}
if (err != 4)
break;
ocelot_parse_ifh(ifh, &info);
dev = ocelot->ports[info.port]->dev;
skb = netdev_alloc_skb(dev, info.len);
if (unlikely(!skb)) {
netdev_err(dev, "Unable to allocate sk_buff\n");
err = -ENOMEM;
break;
}
buf = (u32 *)skb_put(skb, info.len);
len = 0;
do {
sz = ocelot_rx_frame_word(ocelot, grp, false, &val);
*buf++ = val;
len += sz;
} while ((sz == 4) && (len < info.len));
if (sz < 0) {
err = sz;
break;
}
/* Everything we see on an interface that is in the HW bridge
* has already been forwarded.
*/
if (ocelot->bridge_mask & BIT(info.port))
skb->offload_fwd_mark = 1;
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
dev->stats.rx_bytes += len;
dev->stats.rx_packets++;
} while (ocelot_read(ocelot, QS_XTR_DATA_PRESENT) & BIT(grp));
if (err)
while (ocelot_read(ocelot, QS_XTR_DATA_PRESENT) & BIT(grp))
ocelot_read_rix(ocelot, QS_XTR_RD, grp);
return IRQ_HANDLED;
}
static const struct of_device_id mscc_ocelot_match[] = {
{ .compatible = "mscc,vsc7514-switch" },
{ }
};
MODULE_DEVICE_TABLE(of, mscc_ocelot_match);
static int mscc_ocelot_probe(struct platform_device *pdev)
{
int err, irq;
unsigned int i;
struct device_node *np = pdev->dev.of_node;
struct device_node *ports, *portnp;
struct ocelot *ocelot;
u32 val;
struct {
enum ocelot_target id;
char *name;
} res[] = {
{ SYS, "sys" },
{ REW, "rew" },
{ QSYS, "qsys" },
{ ANA, "ana" },
{ QS, "qs" },
{ HSIO, "hsio" },
};
if (!np && !pdev->dev.platform_data)
return -ENODEV;
ocelot = devm_kzalloc(&pdev->dev, sizeof(*ocelot), GFP_KERNEL);
if (!ocelot)
return -ENOMEM;
platform_set_drvdata(pdev, ocelot);
ocelot->dev = &pdev->dev;
for (i = 0; i < ARRAY_SIZE(res); i++) {
struct regmap *target;
target = ocelot_io_platform_init(ocelot, pdev, res[i].name);
if (IS_ERR(target))
return PTR_ERR(target);
ocelot->targets[res[i].id] = target;
}
err = ocelot_chip_init(ocelot);
if (err)
return err;
irq = platform_get_irq_byname(pdev, "xtr");
if (irq < 0)
return -ENODEV;
err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
ocelot_xtr_irq_handler, IRQF_ONESHOT,
"frame extraction", ocelot);
if (err)
return err;
regmap_field_write(ocelot->regfields[SYS_RESET_CFG_MEM_INIT], 1);
regmap_field_write(ocelot->regfields[SYS_RESET_CFG_MEM_ENA], 1);
do {
msleep(1);
regmap_field_read(ocelot->regfields[SYS_RESET_CFG_MEM_INIT],
&val);
} while (val);
regmap_field_write(ocelot->regfields[SYS_RESET_CFG_MEM_ENA], 1);
regmap_field_write(ocelot->regfields[SYS_RESET_CFG_CORE_ENA], 1);
ocelot->num_cpu_ports = 1; /* 1 port on the switch, two groups */
ports = of_get_child_by_name(np, "ethernet-ports");
if (!ports) {
dev_err(&pdev->dev, "no ethernet-ports child node found\n");
return -ENODEV;
}
ocelot->num_phys_ports = of_get_child_count(ports);
ocelot->ports = devm_kcalloc(&pdev->dev, ocelot->num_phys_ports,
sizeof(struct ocelot_port *), GFP_KERNEL);
INIT_LIST_HEAD(&ocelot->multicast);
ocelot_init(ocelot);
ocelot_rmw(ocelot, HSIO_HW_CFG_DEV1G_4_MODE |
HSIO_HW_CFG_DEV1G_6_MODE |
HSIO_HW_CFG_DEV1G_9_MODE,
HSIO_HW_CFG_DEV1G_4_MODE |
HSIO_HW_CFG_DEV1G_6_MODE |
HSIO_HW_CFG_DEV1G_9_MODE,
HSIO_HW_CFG);
for_each_available_child_of_node(ports, portnp) {
struct device_node *phy_node;
struct phy_device *phy;
struct resource *res;
void __iomem *regs;
char res_name[8];
u32 port;
if (of_property_read_u32(portnp, "reg", &port))
continue;
snprintf(res_name, sizeof(res_name), "port%d", port);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
res_name);
regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(regs))
continue;
phy_node = of_parse_phandle(portnp, "phy-handle", 0);
if (!phy_node)
continue;
phy = of_phy_find_device(phy_node);
if (!phy)
continue;
err = ocelot_probe_port(ocelot, port, regs, phy);
if (err) {
dev_err(&pdev->dev, "failed to probe ports\n");
goto err_probe_ports;
}
}
register_netdevice_notifier(&ocelot_netdevice_nb);
dev_info(&pdev->dev, "Ocelot switch probed\n");
return 0;
err_probe_ports:
return err;
}
static int mscc_ocelot_remove(struct platform_device *pdev)
{
struct ocelot *ocelot = platform_get_drvdata(pdev);
ocelot_deinit(ocelot);
unregister_netdevice_notifier(&ocelot_netdevice_nb);
return 0;
}
static struct platform_driver mscc_ocelot_driver = {
.probe = mscc_ocelot_probe,
.remove = mscc_ocelot_remove,
.driver = {
.name = "ocelot-switch",
.of_match_table = mscc_ocelot_match,
},
};
module_platform_driver(mscc_ocelot_driver);
MODULE_DESCRIPTION("Microsemi Ocelot switch driver");
MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
MODULE_LICENSE("Dual MIT/GPL");
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