On 27-10-22, 22:40, Yoshihiro Shimoda wrote:
> 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.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> ---
> drivers/phy/renesas/Kconfig | 7 +
> drivers/phy/renesas/Makefile | 1 +
> drivers/phy/renesas/r8a779f0-ether-serdes.c | 416 ++++++++++++++++++++
> 3 files changed, 424 insertions(+)
> create mode 100644 drivers/phy/renesas/r8a779f0-ether-serdes.c
>
> diff --git a/drivers/phy/renesas/Kconfig b/drivers/phy/renesas/Kconfig
> index 111bdcae775c..68f160b0e8ef 100644
> --- a/drivers/phy/renesas/Kconfig
> +++ b/drivers/phy/renesas/Kconfig
> @@ -32,3 +32,10 @@ config PHY_RCAR_GEN3_USB3
> select GENERIC_PHY
> help
> Support for USB 3.0 PHY found on Renesas R-Car generation 3 SoCs.
> +
> +config PHY_R8A779F0_ETHERNET_SERDES
> + tristate "Renesas R-Car S4-8 Ethernet SERDES driver"
> + depends on ARCH_RENESAS || COMPILE_TEST
> + select GENERIC_PHY
> + help
> + Support for Ethernet SERDES found on Renesas R-Car S4-8 SoCs.
Sorted alphabetically please and not at the end
> diff --git a/drivers/phy/renesas/Makefile b/drivers/phy/renesas/Makefile
> index b599ff8a4349..8896d1919faa 100644
> --- a/drivers/phy/renesas/Makefile
> +++ b/drivers/phy/renesas/Makefile
> @@ -1,4 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_PHY_R8A779F0_ETHERNET_SERDES) += r8a779f0-ether-serdes.o
> obj-$(CONFIG_PHY_RCAR_GEN2) += phy-rcar-gen2.o
> obj-$(CONFIG_PHY_RCAR_GEN3_PCIE) += phy-rcar-gen3-pcie.o
> obj-$(CONFIG_PHY_RCAR_GEN3_USB2) += phy-rcar-gen3-usb2.o
> diff --git a/drivers/phy/renesas/r8a779f0-ether-serdes.c b/drivers/phy/renesas/r8a779f0-ether-serdes.c
> new file mode 100644
> index 000000000000..38cf6c408cae
> --- /dev/null
> +++ b/drivers/phy/renesas/r8a779f0-ether-serdes.c
> @@ -0,0 +1,416 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Renesas Ethernet SERDES device driver
> + *
> + * Copyright (C) 2022 Renesas Electronics Corporation
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/iopoll.h>
> +#include <linux/kernel.h>
> +#include <linux/phy.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.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
> +#define R8A779F0_ETH_SERDES_NUM_RETRY_INIT 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 platform_device *pdev;
> + struct reset_control *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)
> +{
> + iowrite32(bank, addr + R8A779F0_ETH_SERDES_BANK_SELECT);
> + iowrite32(data, addr + offs);
> +}
> +
> +static int
> +r8a779f0_eth_serdes_reg_wait(struct r8a779f0_eth_serdes_channel *channel,
> + u32 offs, u32 bank, u32 mask, u32 expected)
> +{
> + int ret;
> + u32 val;
> +
> + iowrite32(bank, channel->addr + R8A779F0_ETH_SERDES_BANK_SELECT);
> +
> + ret = readl_poll_timeout_atomic(channel->addr + offs, val,
> + (val & mask) == expected,
> + 1, R8A779F0_ETH_SERDES_TIMEOUT_US);
> + if (ret)
> + pr_debug("%s: index %d, offs %x, bank %x, mask %x, expected %x\n",
> + __func__, channel->index, offs, bank, mask, expected);
1) why not dev_ variant
2) this should be error log
> +
> + 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, 0x380, 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;
> +
> + ret = r8a779f0_eth_serdes_reg_wait(&dd->channel[0], 0x0000, 0x380, BIT(15), 0);
> + if (ret)
> + return ret;
> +
> + for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++) {
> + ret = r8a779f0_eth_serdes_chan_setting(&dd->channel[i]);
> + if (ret)
> + return ret;
> + }
> +
> + for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++) {
> + ret = r8a779f0_eth_serdes_chan_speed(&dd->channel[i]);
> + if (ret)
> + return ret;
> + }
> +
> + for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++)
> + r8a779f0_eth_serdes_write32(dd->channel[i].addr, 0x03c0, 0x380, 0x0000);
> + for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++)
> + r8a779f0_eth_serdes_write32(dd->channel[i].addr, 0x03d0, 0x380, 0x0000);
> +
> + for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++) {
> + ret = r8a779f0_eth_serdes_monitor_linkup(&dd->channel[i]);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int r8a779f0_eth_serdes_init(struct phy *p)
> +{
> + struct r8a779f0_eth_serdes_channel *channel = phy_get_drvdata(p);
> + int i, ret;
> +
> + for (i = 0; i < R8A779F0_ETH_SERDES_NUM_RETRY_INIT; i++) {
> + ret = r8a779f0_eth_serdes_hw_init(channel);
> + if (!ret) {
> + channel->dd->initialized = true;
> + break;
> + }
> + usleep_range(1000, 2000);
> + }
> +
> + return ret;
> +}
> +
> +static int r8a779f0_eth_serdes_set_mode(struct phy *p, enum phy_mode mode,
> + int submode)
> +{
> + struct r8a779f0_eth_serdes_channel *channel = phy_get_drvdata(p);
> +
> + 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_channel *channel = phy_get_drvdata(p);
> +
> + channel->speed = speed;
> +
> + return 0;
> +}
> +
> +static const struct phy_ops r8a779f0_eth_serdes_ops = {
> + .init = r8a779f0_eth_serdes_init,
> + .set_mode = r8a779f0_eth_serdes_set_mode,
> + .set_speed = r8a779f0_eth_serdes_set_speed,
> +};
> +
> +static struct phy *r8a779f0_eth_serdes_xlate(struct device *dev,
> + struct of_phandle_args *args)
> +{
> + struct r8a779f0_eth_serdes_drv_data *dd = dev_get_drvdata(dev);
> +
> + if (args->args[0] >= R8A779F0_ETH_SERDES_NUM)
> + return ERR_PTR(-ENODEV);
> +
> + return dd->channel[args->args[0]].phy;
> +}
> +
> +static const struct of_device_id r8a779f0_eth_serdes_of_table[] = {
> + { .compatible = "renesas,r8a779f0-ether-serdes", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, r8a779f0_eth_serdes_of_table);
> +
> +static int r8a779f0_eth_serdes_probe(struct platform_device *pdev)
> +{
> + struct r8a779f0_eth_serdes_drv_data *dd;
> + struct phy_provider *provider;
> + struct resource *res;
> + int i;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(&pdev->dev, "invalid resource\n");
> + return -EINVAL;
> + }
> +
> + dd = devm_kzalloc(&pdev->dev, sizeof(*dd), GFP_KERNEL);
> + if (!dd)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, dd);
> + dd->pdev = pdev;
> + dd->addr = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(dd->addr))
> + return PTR_ERR(dd->addr);
> +
> + dd->reset = devm_reset_control_get(&pdev->dev, NULL);
> + if (IS_ERR(dd->reset))
> + return PTR_ERR(dd->reset);
> +
> + reset_control_reset(dd->reset);
> +
> + for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++) {
> + struct r8a779f0_eth_serdes_channel *channel = &dd->channel[i];
> +
> + channel->phy = devm_phy_create(&pdev->dev, NULL,
> + &r8a779f0_eth_serdes_ops);
> + if (IS_ERR(channel->phy))
> + return PTR_ERR(channel->phy);
> + channel->addr = dd->addr + R8A779F0_ETH_SERDES_OFFSET * i;
> + channel->dd = dd;
> + channel->index = i;
> + phy_set_drvdata(channel->phy, channel);
> + }
> +
> + provider = devm_of_phy_provider_register(&pdev->dev,
> + r8a779f0_eth_serdes_xlate);
> + if (IS_ERR(provider))
> + return PTR_ERR(provider);
> +
> + pm_runtime_enable(&pdev->dev);
> + pm_runtime_get_sync(&pdev->dev);
> +
> + return 0;
> +}
> +
> +static int r8a779f0_eth_serdes_remove(struct platform_device *pdev)
> +{
> + pm_runtime_put(&pdev->dev);
> + pm_runtime_disable(&pdev->dev);
> +
> + platform_set_drvdata(pdev, NULL);
> +
> + return 0;
> +}
> +
> +static struct platform_driver r8a779f0_eth_serdes_driver_platform = {
> + .probe = r8a779f0_eth_serdes_probe,
> + .remove = r8a779f0_eth_serdes_remove,
> + .driver = {
> + .name = "r8a779f0_eth_serdes",
> + .of_match_table = r8a779f0_eth_serdes_of_table,
> + }
> +};
> +module_platform_driver(r8a779f0_eth_serdes_driver_platform);
> +MODULE_AUTHOR("Yoshihiro Shimoda");
> +MODULE_DESCRIPTION("Renesas Ethernet SERDES device driver");
> +MODULE_LICENSE("GPL");
> --
> 2.25.1
--
~Vinod
