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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Russell King, Deep Blue Solutions Ltd.
*
* Partly derived from CP110 comphy driver by Antoine Tenart
* <antoine.tenart@bootlin.com>
*/
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/phy/phy.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#define MAX_A38X_COMPHY 6
#define MAX_A38X_PORTS 3
#define COMPHY_CFG1 0x00
#define COMPHY_CFG1_GEN_TX(x) ((x) << 26)
#define COMPHY_CFG1_GEN_TX_MSK COMPHY_CFG1_GEN_TX(15)
#define COMPHY_CFG1_GEN_RX(x) ((x) << 22)
#define COMPHY_CFG1_GEN_RX_MSK COMPHY_CFG1_GEN_RX(15)
#define GEN_SGMII_1_25GBPS 6
#define GEN_SGMII_3_125GBPS 8
#define COMPHY_STAT1 0x18
#define COMPHY_STAT1_PLL_RDY_TX BIT(3)
#define COMPHY_STAT1_PLL_RDY_RX BIT(2)
#define COMPHY_SELECTOR 0xfc
struct a38x_comphy;
struct a38x_comphy_lane {
void __iomem *base;
struct a38x_comphy *priv;
unsigned int n;
int port;
};
struct a38x_comphy {
void __iomem *base;
struct device *dev;
struct a38x_comphy_lane lane[MAX_A38X_COMPHY];
};
static const u8 gbe_mux[MAX_A38X_COMPHY][MAX_A38X_PORTS] = {
{ 0, 0, 0 },
{ 4, 5, 0 },
{ 0, 4, 0 },
{ 0, 0, 4 },
{ 0, 3, 0 },
{ 0, 0, 3 },
};
static void a38x_comphy_set_reg(struct a38x_comphy_lane *lane,
unsigned int offset, u32 mask, u32 value)
{
u32 val;
val = readl_relaxed(lane->base + offset) & ~mask;
writel(val | value, lane->base + offset);
}
static void a38x_comphy_set_speed(struct a38x_comphy_lane *lane,
unsigned int gen_tx, unsigned int gen_rx)
{
a38x_comphy_set_reg(lane, COMPHY_CFG1,
COMPHY_CFG1_GEN_TX_MSK | COMPHY_CFG1_GEN_RX_MSK,
COMPHY_CFG1_GEN_TX(gen_tx) |
COMPHY_CFG1_GEN_RX(gen_rx));
}
static int a38x_comphy_poll(struct a38x_comphy_lane *lane,
unsigned int offset, u32 mask, u32 value)
{
u32 val;
int ret;
ret = readl_relaxed_poll_timeout_atomic(lane->base + offset, val,
(val & mask) == value,
1000, 150000);
if (ret)
dev_err(lane->priv->dev,
"comphy%u: timed out waiting for status\n", lane->n);
return ret;
}
/*
* We only support changing the speed for comphys configured for GBE.
* Since that is all we do, we only poll for PLL ready status.
*/
static int a38x_comphy_set_mode(struct phy *phy, enum phy_mode mode, int sub)
{
struct a38x_comphy_lane *lane = phy_get_drvdata(phy);
unsigned int gen;
if (mode != PHY_MODE_ETHERNET)
return -EINVAL;
switch (sub) {
case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_1000BASEX:
gen = GEN_SGMII_1_25GBPS;
break;
case PHY_INTERFACE_MODE_2500BASEX:
gen = GEN_SGMII_3_125GBPS;
break;
default:
return -EINVAL;
}
a38x_comphy_set_speed(lane, gen, gen);
return a38x_comphy_poll(lane, COMPHY_STAT1,
COMPHY_STAT1_PLL_RDY_TX |
COMPHY_STAT1_PLL_RDY_RX,
COMPHY_STAT1_PLL_RDY_TX |
COMPHY_STAT1_PLL_RDY_RX);
}
static const struct phy_ops a38x_comphy_ops = {
.set_mode = a38x_comphy_set_mode,
.owner = THIS_MODULE,
};
static struct phy *a38x_comphy_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct a38x_comphy_lane *lane;
struct phy *phy;
u32 val;
if (WARN_ON(args->args[0] >= MAX_A38X_PORTS))
return ERR_PTR(-EINVAL);
phy = of_phy_simple_xlate(dev, args);
if (IS_ERR(phy))
return phy;
lane = phy_get_drvdata(phy);
if (lane->port >= 0)
return ERR_PTR(-EBUSY);
lane->port = args->args[0];
val = readl_relaxed(lane->priv->base + COMPHY_SELECTOR);
val = (val >> (4 * lane->n)) & 0xf;
if (!gbe_mux[lane->n][lane->port] ||
val != gbe_mux[lane->n][lane->port]) {
dev_warn(lane->priv->dev,
"comphy%u: not configured for GBE\n", lane->n);
phy = ERR_PTR(-EINVAL);
}
return phy;
}
static int a38x_comphy_probe(struct platform_device *pdev)
{
struct phy_provider *provider;
struct device_node *child;
struct a38x_comphy *priv;
struct resource *res;
void __iomem *base;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
priv->dev = &pdev->dev;
priv->base = base;
for_each_available_child_of_node(pdev->dev.of_node, child) {
struct phy *phy;
int ret;
u32 val;
ret = of_property_read_u32(child, "reg", &val);
if (ret < 0) {
dev_err(&pdev->dev, "missing 'reg' property (%d)\n",
ret);
continue;
}
if (val >= MAX_A38X_COMPHY || priv->lane[val].base) {
dev_err(&pdev->dev, "invalid 'reg' property\n");
continue;
}
phy = devm_phy_create(&pdev->dev, child, &a38x_comphy_ops);
if (IS_ERR(phy))
return PTR_ERR(phy);
priv->lane[val].base = base + 0x28 * val;
priv->lane[val].priv = priv;
priv->lane[val].n = val;
priv->lane[val].port = -1;
phy_set_drvdata(phy, &priv->lane[val]);
}
dev_set_drvdata(&pdev->dev, priv);
provider = devm_of_phy_provider_register(&pdev->dev, a38x_comphy_xlate);
return PTR_ERR_OR_ZERO(provider);
}
static const struct of_device_id a38x_comphy_of_match_table[] = {
{ .compatible = "marvell,armada-380-comphy" },
{ },
};
MODULE_DEVICE_TABLE(of, a38x_comphy_of_match_table);
static struct platform_driver a38x_comphy_driver = {
.probe = a38x_comphy_probe,
.driver = {
.name = "armada-38x-comphy",
.of_match_table = a38x_comphy_of_match_table,
},
};
module_platform_driver(a38x_comphy_driver);
MODULE_AUTHOR("Russell King <rmk+kernel@armlinux.org.uk>");
MODULE_DESCRIPTION("Common PHY driver for Armada 38x SoCs");
MODULE_LICENSE("GPL v2");
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