[PATCH 4/4] phy: renesas: Add Renesas Ethernet SERDES driver for R-Car S4-8
Marek Vasut
marek.vasut+renesas at mailbox.org
Sun Mar 19 18:09:43 CET 2023
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 at mailbox.org>
---
Cc: Jim Liu <jim.t90615 at gmail.com>
Cc: Neil Armstrong <neil.armstrong at linaro.org>
Cc: Patrice Chotard <patrice.chotard at foss.st.com>
Cc: Samuel Holland <samuel at sholland.org>
Cc: Sumit Garg <sumit.garg at linaro.org>
Cc: Weijie Gao <weijie.gao at mediatek.com>
---
drivers/phy/Kconfig | 1 +
drivers/phy/Makefile | 1 +
drivers/phy/renesas/Kconfig | 9 +
drivers/phy/renesas/Makefile | 1 +
drivers/phy/renesas/r8a779f0-ether-serdes.c | 384 ++++++++++++++++++++
5 files changed, 396 insertions(+)
create mode 100644 drivers/phy/renesas/Kconfig
create mode 100644 drivers/phy/renesas/Makefile
create mode 100644 drivers/phy/renesas/r8a779f0-ether-serdes.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index cf4d5908d73..7a2d54f71d2 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -285,5 +285,6 @@ source "drivers/phy/rockchip/Kconfig"
source "drivers/phy/cadence/Kconfig"
source "drivers/phy/ti/Kconfig"
source "drivers/phy/qcom/Kconfig"
+source "drivers/phy/renesas/Kconfig"
endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index a3b9f3c5b18..aca365d219c 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -41,3 +41,4 @@ obj-$(CONFIG_PHY_XILINX_ZYNQMP) += phy-zynqmp.o
obj-y += cadence/
obj-y += ti/
obj-y += qcom/
+obj-y += renesas/
diff --git a/drivers/phy/renesas/Kconfig b/drivers/phy/renesas/Kconfig
new file mode 100644
index 00000000000..0efb0f8f337
--- /dev/null
+++ b/drivers/phy/renesas/Kconfig
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Phy drivers for Renesas platforms
+
+config PHY_R8A779F0_ETHERNET_SERDES
+ tristate "Renesas R-Car S4-8 Ethernet SERDES driver"
+ depends on RCAR_64 && PHY
+ help
+ Support for Ethernet SERDES found on Renesas R-Car S4-8 SoCs.
diff --git a/drivers/phy/renesas/Makefile b/drivers/phy/renesas/Makefile
new file mode 100644
index 00000000000..fd6b8d964e5
--- /dev/null
+++ b/drivers/phy/renesas/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_PHY_R8A779F0_ETHERNET_SERDES) += r8a779f0-ether-serdes.o
diff --git a/drivers/phy/renesas/r8a779f0-ether-serdes.c b/drivers/phy/renesas/r8a779f0-ether-serdes.c
new file mode 100644
index 00000000000..bd1fdd3a667
--- /dev/null
+++ b/drivers/phy/renesas/r8a779f0-ether-serdes.c
@@ -0,0 +1,384 @@
+// 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),
+};
--
2.39.2
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