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u-boot/drivers/phy/renesas/r8a779f0-ether-serdes.c
Marek Vasut 08c5614476 phy: renesas: Add Renesas Ethernet SERDES driver for R-Car S4-8 
Add Renesas Ethernet SERDES driver for R-Car S4-8 (r8a779f0).
The datasheet describes initialization procedure without any information
about registers' name/bits. So, this is all black magic to initialize
the hardware. Especially, all channels should be initialized at once.

This driver is imported and adjusted from Linux 6.3-rc1 commit:
50133cd3e8dd1 ("phy: renesas: r8a779f0-eth-serdes: Remove retry code in .init()")

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2023-04-16 16:18:29 +02:00

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// SPDX-License-Identifier: GPL-2.0
/* Renesas Ethernet SERDES device driver
*
* Copyright (C) 2022 Renesas Electronics Corporation
*/
#include <asm/io.h>
#include <clk-uclass.h>
#include <clk.h>
#include <common.h>
#include <div64.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <dm/of_access.h>
#include <generic-phy.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <log.h>
#include <reset.h>
#include <syscon.h>
#define R8A779F0_ETH_SERDES_NUM 3
#define R8A779F0_ETH_SERDES_OFFSET 0x0400
#define R8A779F0_ETH_SERDES_BANK_SELECT 0x03fc
#define R8A779F0_ETH_SERDES_TIMEOUT_US 100000
#define R8A779F0_ETH_SERDES_NUM_RETRY_LINKUP 3
struct r8a779f0_eth_serdes_drv_data;
struct r8a779f0_eth_serdes_channel {
struct r8a779f0_eth_serdes_drv_data *dd;
struct phy *phy;
void __iomem *addr;
phy_interface_t phy_interface;
int speed;
int index;
};
struct r8a779f0_eth_serdes_drv_data {
void __iomem *addr;
struct reset_ctl *reset;
struct r8a779f0_eth_serdes_channel channel[R8A779F0_ETH_SERDES_NUM];
bool initialized;
};
/*
* The datasheet describes initialization procedure without any information
* about registers' name/bits. So, this is all black magic to initialize
* the hardware.
*/
static void r8a779f0_eth_serdes_write32(void __iomem *addr, u32 offs, u32 bank, u32 data)
{
writel(bank, addr + R8A779F0_ETH_SERDES_BANK_SELECT);
writel(data, addr + offs);
}
static int
r8a779f0_eth_serdes_reg_wait(struct r8a779f0_eth_serdes_channel *channel,
u32 offs, u32 bank, u32 mask, u32 expected)
{
u32 val = 0;
int ret;
writel(bank, channel->addr + R8A779F0_ETH_SERDES_BANK_SELECT);
ret = readl_poll_timeout(channel->addr + offs, val,
(val & mask) == expected,
R8A779F0_ETH_SERDES_TIMEOUT_US);
if (ret)
dev_dbg(channel->phy->dev,
"%s: index %d, offs %x, bank %x, mask %x, expected %x\n",
__func__, channel->index, offs, bank, mask, expected);
return ret;
}
static int
r8a779f0_eth_serdes_common_init_ram(struct r8a779f0_eth_serdes_drv_data *dd)
{
struct r8a779f0_eth_serdes_channel *channel;
int i, ret;
for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++) {
channel = &dd->channel[i];
ret = r8a779f0_eth_serdes_reg_wait(channel, 0x026c, 0x180, BIT(0), 0x01);
if (ret)
return ret;
}
r8a779f0_eth_serdes_write32(dd->addr, 0x026c, 0x180, 0x03);
return ret;
}
static int
r8a779f0_eth_serdes_common_setting(struct r8a779f0_eth_serdes_channel *channel)
{
struct r8a779f0_eth_serdes_drv_data *dd = channel->dd;
switch (channel->phy_interface) {
case PHY_INTERFACE_MODE_SGMII:
r8a779f0_eth_serdes_write32(dd->addr, 0x0244, 0x180, 0x0097);
r8a779f0_eth_serdes_write32(dd->addr, 0x01d0, 0x180, 0x0060);
r8a779f0_eth_serdes_write32(dd->addr, 0x01d8, 0x180, 0x2200);
r8a779f0_eth_serdes_write32(dd->addr, 0x01d4, 0x180, 0x0000);
r8a779f0_eth_serdes_write32(dd->addr, 0x01e0, 0x180, 0x003d);
return 0;
default:
return -EOPNOTSUPP;
}
}
static int
r8a779f0_eth_serdes_chan_setting(struct r8a779f0_eth_serdes_channel *channel)
{
int ret;
switch (channel->phy_interface) {
case PHY_INTERFACE_MODE_SGMII:
r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x380, 0x2000);
r8a779f0_eth_serdes_write32(channel->addr, 0x01c0, 0x180, 0x0011);
r8a779f0_eth_serdes_write32(channel->addr, 0x0248, 0x180, 0x0540);
r8a779f0_eth_serdes_write32(channel->addr, 0x0258, 0x180, 0x0015);
r8a779f0_eth_serdes_write32(channel->addr, 0x0144, 0x180, 0x0100);
r8a779f0_eth_serdes_write32(channel->addr, 0x01a0, 0x180, 0x0000);
r8a779f0_eth_serdes_write32(channel->addr, 0x00d0, 0x180, 0x0002);
r8a779f0_eth_serdes_write32(channel->addr, 0x0150, 0x180, 0x0003);
r8a779f0_eth_serdes_write32(channel->addr, 0x00c8, 0x180, 0x0100);
r8a779f0_eth_serdes_write32(channel->addr, 0x0148, 0x180, 0x0100);
r8a779f0_eth_serdes_write32(channel->addr, 0x0174, 0x180, 0x0000);
r8a779f0_eth_serdes_write32(channel->addr, 0x0160, 0x180, 0x0007);
r8a779f0_eth_serdes_write32(channel->addr, 0x01ac, 0x180, 0x0000);
r8a779f0_eth_serdes_write32(channel->addr, 0x00c4, 0x180, 0x0310);
r8a779f0_eth_serdes_write32(channel->addr, 0x00c8, 0x180, 0x0101);
ret = r8a779f0_eth_serdes_reg_wait(channel, 0x00c8, 0x0180, BIT(0), 0);
if (ret)
return ret;
r8a779f0_eth_serdes_write32(channel->addr, 0x0148, 0x180, 0x0101);
ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0148, 0x0180, BIT(0), 0);
if (ret)
return ret;
r8a779f0_eth_serdes_write32(channel->addr, 0x00c4, 0x180, 0x1310);
r8a779f0_eth_serdes_write32(channel->addr, 0x00d8, 0x180, 0x1800);
r8a779f0_eth_serdes_write32(channel->addr, 0x00dc, 0x180, 0x0000);
r8a779f0_eth_serdes_write32(channel->addr, 0x001c, 0x300, 0x0001);
r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x380, 0x2100);
ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0000, 0x0380, BIT(8), 0);
if (ret)
return ret;
if (channel->speed == 1000)
r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x1f00, 0x0140);
else if (channel->speed == 100)
r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x1f00, 0x2100);
/* For AN_ON */
r8a779f0_eth_serdes_write32(channel->addr, 0x0004, 0x1f80, 0x0005);
r8a779f0_eth_serdes_write32(channel->addr, 0x0028, 0x1f80, 0x07a1);
r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x1f80, 0x0208);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int
r8a779f0_eth_serdes_chan_speed(struct r8a779f0_eth_serdes_channel *channel)
{
int ret;
switch (channel->phy_interface) {
case PHY_INTERFACE_MODE_SGMII:
/* For AN_ON */
if (channel->speed == 1000)
r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x1f00, 0x1140);
else if (channel->speed == 100)
r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x1f00, 0x3100);
ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0008, 0x1f80, BIT(0), 1);
if (ret)
return ret;
r8a779f0_eth_serdes_write32(channel->addr, 0x0008, 0x1f80, 0x0000);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int r8a779f0_eth_serdes_monitor_linkup(struct r8a779f0_eth_serdes_channel *channel)
{
int i, ret;
for (i = 0; i < R8A779F0_ETH_SERDES_NUM_RETRY_LINKUP; i++) {
ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0004, 0x300,
BIT(2), BIT(2));
if (!ret)
break;
/* restart */
r8a779f0_eth_serdes_write32(channel->addr, 0x0144, 0x180, 0x0100);
udelay(1);
r8a779f0_eth_serdes_write32(channel->addr, 0x0144, 0x180, 0x0000);
}
return ret;
}
static int r8a779f0_eth_serdes_hw_init(struct r8a779f0_eth_serdes_channel *channel)
{
struct r8a779f0_eth_serdes_drv_data *dd = channel->dd;
int i, ret;
if (dd->initialized)
return 0;
ret = r8a779f0_eth_serdes_common_init_ram(dd);
if (ret)
return ret;
for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++) {
ret = r8a779f0_eth_serdes_reg_wait(&dd->channel[i], 0x0000,
0x300, BIT(15), 0);
if (ret)
return ret;
}
for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++)
r8a779f0_eth_serdes_write32(dd->channel[i].addr, 0x03d4, 0x380, 0x0443);
ret = r8a779f0_eth_serdes_common_setting(channel);
if (ret)
return ret;
for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++)
r8a779f0_eth_serdes_write32(dd->channel[i].addr, 0x03d0, 0x380, 0x0001);
r8a779f0_eth_serdes_write32(dd->addr, 0x0000, 0x380, 0x8000);
ret = r8a779f0_eth_serdes_common_init_ram(dd);
if (ret)
return ret;
return r8a779f0_eth_serdes_reg_wait(&dd->channel[0], 0x0000, 0x380, BIT(15), 0);
}
static int r8a779f0_eth_serdes_init(struct phy *p)
{
struct r8a779f0_eth_serdes_drv_data *dd = dev_get_priv(p->dev);
struct r8a779f0_eth_serdes_channel *channel = dd->channel + p->id;
int ret;
ret = r8a779f0_eth_serdes_hw_init(channel);
if (!ret)
channel->dd->initialized = true;
return ret;
}
static int r8a779f0_eth_serdes_hw_init_late(struct r8a779f0_eth_serdes_channel *channel)
{
int ret;
ret = r8a779f0_eth_serdes_chan_setting(channel);
if (ret)
return ret;
ret = r8a779f0_eth_serdes_chan_speed(channel);
if (ret)
return ret;
r8a779f0_eth_serdes_write32(channel->addr, 0x03c0, 0x380, 0x0000);
r8a779f0_eth_serdes_write32(channel->addr, 0x03d0, 0x380, 0x0000);
return r8a779f0_eth_serdes_monitor_linkup(channel);
}
static int r8a779f0_eth_serdes_power_on(struct phy *p)
{
struct r8a779f0_eth_serdes_drv_data *dd = dev_get_priv(p->dev);
struct r8a779f0_eth_serdes_channel *channel = dd->channel + p->id;
return r8a779f0_eth_serdes_hw_init_late(channel);
}
static int r8a779f0_eth_serdes_set_mode(struct phy *p, enum phy_mode mode,
int submode)
{
struct r8a779f0_eth_serdes_drv_data *dd = dev_get_priv(p->dev);
struct r8a779f0_eth_serdes_channel *channel = dd->channel + p->id;
if (mode != PHY_MODE_ETHERNET)
return -EOPNOTSUPP;
switch (submode) {
case PHY_INTERFACE_MODE_GMII:
case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_USXGMII:
channel->phy_interface = submode;
return 0;
default:
return -EOPNOTSUPP;
}
}
static int r8a779f0_eth_serdes_set_speed(struct phy *p, int speed)
{
struct r8a779f0_eth_serdes_drv_data *dd = dev_get_priv(p->dev);
struct r8a779f0_eth_serdes_channel *channel = dd->channel + p->id;
channel->speed = speed;
return 0;
}
static int r8a779f0_eth_serdes_of_xlate(struct phy *phy,
struct ofnode_phandle_args *args)
{
if (args->args_count < 1)
return -ENODEV;
if (args->args[0] >= R8A779F0_ETH_SERDES_NUM)
return -ENODEV;
phy->id = args->args[0];
return 0;
}
static const struct phy_ops r8a779f0_eth_serdes_ops = {
.init = r8a779f0_eth_serdes_init,
.power_on = r8a779f0_eth_serdes_power_on,
.set_mode = r8a779f0_eth_serdes_set_mode,
.set_speed = r8a779f0_eth_serdes_set_speed,
.of_xlate = r8a779f0_eth_serdes_of_xlate,
};
static const struct udevice_id r8a779f0_eth_serdes_of_table[] = {
{ .compatible = "renesas,r8a779f0-ether-serdes", },
{ }
};
static int r8a779f0_eth_serdes_probe(struct udevice *dev)
{
struct r8a779f0_eth_serdes_drv_data *dd = dev_get_priv(dev);
int i;
dd->addr = dev_read_addr_ptr(dev);
if (!dd->addr)
return -EINVAL;
dd->reset = devm_reset_control_get(dev, NULL);
if (IS_ERR(dd->reset))
return PTR_ERR(dd->reset);
reset_assert(dd->reset);
reset_deassert(dd->reset);
for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++) {
struct r8a779f0_eth_serdes_channel *channel = &dd->channel[i];
channel->addr = dd->addr + R8A779F0_ETH_SERDES_OFFSET * i;
channel->dd = dd;
channel->index = i;
}
return 0;
}
U_BOOT_DRIVER(r8a779f0_eth_serdes_driver_platform) = {
.name = "r8a779f0_eth_serdes",
.id = UCLASS_PHY,
.of_match = r8a779f0_eth_serdes_of_table,
.probe = r8a779f0_eth_serdes_probe,
.ops = &r8a779f0_eth_serdes_ops,
.priv_auto = sizeof(struct r8a779f0_eth_serdes_drv_data),
};
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