Re: [PATCH v2 net-next 3/3] net: dsa: ocelot: felix: utilize shared mscc-miim driver for indirect MDIO access

From: Vladimir Oltean
Date: Thu Nov 25 2021 - 20:00:48 EST

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In reply to: Colin Foster: "[PATCH v2 net-next 3/3] net: dsa: ocelot: felix: utilize shared mscc-miim driver for indirect MDIO access"
Next in thread: Colin Foster: "Re: [PATCH v2 net-next 3/3] net: dsa: ocelot: felix: utilize shared mscc-miim driver for indirect MDIO access"
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On Thu, Nov 25, 2021 at 12:13:01PM -0800, Colin Foster wrote:
> Switch to a shared MDIO access implementation by way of the mdio-mscc-miim
> driver.
>
> Signed-off-by: Colin Foster <colin.foster@xxxxxxxxxxxxxxxx>
> ---

I'm sorry, I still wasn't able to boot the T1040RDB to test these, it
looks like it's bricked or something. I'll try to do more debugging
tomorrow.

> drivers/net/dsa/ocelot/Kconfig | 1 +
> drivers/net/dsa/ocelot/seville_vsc9953.c | 103 +++--------------------
> drivers/net/mdio/mdio-mscc-miim.c | 40 ++++++---
> include/linux/mdio/mdio-mscc-miim.h | 20 +++++
> include/soc/mscc/ocelot.h | 1 +
> 5 files changed, 61 insertions(+), 104 deletions(-)
> create mode 100644 include/linux/mdio/mdio-mscc-miim.h
>
> diff --git a/drivers/net/dsa/ocelot/Kconfig b/drivers/net/dsa/ocelot/Kconfig
> index 9948544ba1c4..220b0b027b55 100644
> --- a/drivers/net/dsa/ocelot/Kconfig
> +++ b/drivers/net/dsa/ocelot/Kconfig
> @@ -21,6 +21,7 @@ config NET_DSA_MSCC_SEVILLE
> depends on NET_VENDOR_MICROSEMI
> depends on HAS_IOMEM
> depends on PTP_1588_CLOCK_OPTIONAL
> + select MDIO_MSCC_MIIM
> select MSCC_OCELOT_SWITCH_LIB
> select NET_DSA_TAG_OCELOT_8021Q
> select NET_DSA_TAG_OCELOT
> diff --git a/drivers/net/dsa/ocelot/seville_vsc9953.c b/drivers/net/dsa/ocelot/seville_vsc9953.c
> index db124922c374..41ec60a1fc96 100644
> --- a/drivers/net/dsa/ocelot/seville_vsc9953.c
> +++ b/drivers/net/dsa/ocelot/seville_vsc9953.c
> @@ -6,19 +6,14 @@
> #include <soc/mscc/ocelot_vcap.h>
> #include <soc/mscc/ocelot_sys.h>
> #include <soc/mscc/ocelot.h>
> +#include <linux/mdio/mdio-mscc-miim.h>
> +#include <linux/of_mdio.h>
> #include <linux/of_platform.h>
> #include <linux/pcs-lynx.h>
> #include <linux/dsa/ocelot.h>
> #include <linux/iopoll.h>
> -#include <linux/of_mdio.h>
> #include "felix.h"
>
> -#define MSCC_MIIM_CMD_OPR_WRITE BIT(1)
> -#define MSCC_MIIM_CMD_OPR_READ BIT(2)
> -#define MSCC_MIIM_CMD_WRDATA_SHIFT 4
> -#define MSCC_MIIM_CMD_REGAD_SHIFT 20
> -#define MSCC_MIIM_CMD_PHYAD_SHIFT 25
> -#define MSCC_MIIM_CMD_VLD BIT(31)
> #define VSC9953_VCAP_POLICER_BASE 11
> #define VSC9953_VCAP_POLICER_MAX 31
> #define VSC9953_VCAP_POLICER_BASE2 120
> @@ -862,7 +857,6 @@ static struct vcap_props vsc9953_vcap_props[] = {
> #define VSC9953_INIT_TIMEOUT 50000
> #define VSC9953_GCB_RST_SLEEP 100
> #define VSC9953_SYS_RAMINIT_SLEEP 80
> -#define VCS9953_MII_TIMEOUT 10000
>
> static int vsc9953_gcb_soft_rst_status(struct ocelot *ocelot)
> {
> @@ -882,82 +876,6 @@ static int vsc9953_sys_ram_init_status(struct ocelot *ocelot)
> return val;
> }
>
> -static int vsc9953_gcb_miim_pending_status(struct ocelot *ocelot)
> -{
> - int val;
> -
> - ocelot_field_read(ocelot, GCB_MIIM_MII_STATUS_PENDING, &val);
> -
> - return val;
> -}
> -
> -static int vsc9953_gcb_miim_busy_status(struct ocelot *ocelot)
> -{
> - int val;
> -
> - ocelot_field_read(ocelot, GCB_MIIM_MII_STATUS_BUSY, &val);
> -
> - return val;
> -}
> -
> -static int vsc9953_mdio_write(struct mii_bus *bus, int phy_id, int regnum,
> - u16 value)
> -{
> - struct ocelot *ocelot = bus->priv;
> - int err, cmd, val;
> -
> - /* Wait while MIIM controller becomes idle */
> - err = readx_poll_timeout(vsc9953_gcb_miim_pending_status, ocelot,
> - val, !val, 10, VCS9953_MII_TIMEOUT);
> - if (err) {
> - dev_err(ocelot->dev, "MDIO write: pending timeout\n");
> - goto out;
> - }
> -
> - cmd = MSCC_MIIM_CMD_VLD | (phy_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> - (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |
> - (value << MSCC_MIIM_CMD_WRDATA_SHIFT) |
> - MSCC_MIIM_CMD_OPR_WRITE;
> -
> - ocelot_write(ocelot, cmd, GCB_MIIM_MII_CMD);
> -
> -out:
> - return err;
> -}
> -
> -static int vsc9953_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
> -{
> - struct ocelot *ocelot = bus->priv;
> - int err, cmd, val;
> -
> - /* Wait until MIIM controller becomes idle */
> - err = readx_poll_timeout(vsc9953_gcb_miim_pending_status, ocelot,
> - val, !val, 10, VCS9953_MII_TIMEOUT);
> - if (err) {
> - dev_err(ocelot->dev, "MDIO read: pending timeout\n");
> - goto out;
> - }
> -
> - /* Write the MIIM COMMAND register */
> - cmd = MSCC_MIIM_CMD_VLD | (phy_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> - (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) | MSCC_MIIM_CMD_OPR_READ;
> -
> - ocelot_write(ocelot, cmd, GCB_MIIM_MII_CMD);
> -
> - /* Wait while read operation via the MIIM controller is in progress */
> - err = readx_poll_timeout(vsc9953_gcb_miim_busy_status, ocelot,
> - val, !val, 10, VCS9953_MII_TIMEOUT);
> - if (err) {
> - dev_err(ocelot->dev, "MDIO read: busy timeout\n");
> - goto out;
> - }
> -
> - val = ocelot_read(ocelot, GCB_MIIM_MII_DATA);
> -
> - err = val & 0xFFFF;
> -out:
> - return err;
> -}
>
> /* CORE_ENA is in SYS:SYSTEM:RESET_CFG
> * MEM_INIT is in SYS:SYSTEM:RESET_CFG
> @@ -1101,16 +1019,15 @@ static int vsc9953_mdio_bus_alloc(struct ocelot *ocelot)
> return -ENOMEM;
> }
>
> - bus = devm_mdiobus_alloc(dev);
> - if (!bus)
> - return -ENOMEM;
> + rc = mscc_miim_setup(dev, &bus, "VSC9953 internal MDIO bus",
> + ocelot->targets[GCB],
> + ocelot->map[GCB][GCB_MIIM_MII_STATUS & REG_MASK],
> + NULL, 0);
>
> - bus->name = "VSC9953 internal MDIO bus";
> - bus->read = vsc9953_mdio_read;
> - bus->write = vsc9953_mdio_write;
> - bus->parent = dev;
> - bus->priv = ocelot;
> - snprintf(bus->id, MII_BUS_ID_SIZE, "%s-imdio", dev_name(dev));
> + if (rc) {
> + dev_err(dev, "failed to setup MDIO bus\n");
> + return rc;
> + }
>
> /* Needed in order to initialize the bus mutex lock */
> rc = of_mdiobus_register(bus, NULL);
> diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
> index 5a9c0b311bdb..9eed6b597f21 100644
> --- a/drivers/net/mdio/mdio-mscc-miim.c
> +++ b/drivers/net/mdio/mdio-mscc-miim.c
> @@ -10,6 +10,7 @@
> #include <linux/io.h>
> #include <linux/iopoll.h>
> #include <linux/kernel.h>
> +#include <linux/mdio/mdio-mscc-miim.h>
> #include <linux/module.h>
> #include <linux/of_mdio.h>
> #include <linux/phy.h>
> @@ -37,7 +38,9 @@
>
> struct mscc_miim_dev {
> struct regmap *regs;
> + int mii_status_offset;
> struct regmap *phy_regs;
> + int phy_reset_offset;
> };
>
> /* When high resolution timers aren't built-in: we can't use usleep_range() as
> @@ -56,7 +59,8 @@ static int mscc_miim_status(struct mii_bus *bus)
> struct mscc_miim_dev *miim = bus->priv;
> int val, ret;
>
> - ret = regmap_read(miim->regs, MSCC_MIIM_REG_STATUS, &val);
> + ret = regmap_read(miim->regs,
> + MSCC_MIIM_REG_STATUS + miim->mii_status_offset, &val);
> if (ret < 0) {
> WARN_ONCE(1, "mscc miim status read error %d\n", ret);
> return ret;
> @@ -93,7 +97,9 @@ static int mscc_miim_read(struct mii_bus *bus, int mii_id, int regnum)
> if (ret)
> goto out;
>
> - ret = regmap_write(miim->regs, MSCC_MIIM_REG_CMD, MSCC_MIIM_CMD_VLD |
> + ret = regmap_write(miim->regs,
> + MSCC_MIIM_REG_CMD + miim->mii_status_offset,
> + MSCC_MIIM_CMD_VLD |
> (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |
> MSCC_MIIM_CMD_OPR_READ);
> @@ -107,8 +113,8 @@ static int mscc_miim_read(struct mii_bus *bus, int mii_id, int regnum)
> if (ret)
> goto out;
>
> - ret = regmap_read(miim->regs, MSCC_MIIM_REG_DATA, &val);
> -
> + ret = regmap_read(miim->regs,
> + MSCC_MIIM_REG_DATA + miim->mii_status_offset, &val);

I'd be tempted to create one separate regmap for DEVCPU_MIIM which
starts precisely at 0x8700AC, and therefore does not need adjustment
with an offset here. What do you think?

> if (ret < 0) {
> WARN_ONCE(1, "mscc miim read data reg error %d\n", ret);
> goto out;
> @@ -134,7 +140,9 @@ static int mscc_miim_write(struct mii_bus *bus, int mii_id,
> if (ret < 0)
> goto out;
>
> - ret = regmap_write(miim->regs, MSCC_MIIM_REG_CMD, MSCC_MIIM_CMD_VLD |
> + ret = regmap_write(miim->regs,
> + MSCC_MIIM_REG_CMD + miim->mii_status_offset,
> + MSCC_MIIM_CMD_VLD |
> (mii_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
> (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |
> (value << MSCC_MIIM_CMD_WRDATA_SHIFT) |
> @@ -149,16 +157,19 @@ static int mscc_miim_write(struct mii_bus *bus, int mii_id,
> static int mscc_miim_reset(struct mii_bus *bus)
> {
> struct mscc_miim_dev *miim = bus->priv;
> + int offset = miim->phy_reset_offset;
> int ret;
>
> if (miim->phy_regs) {
> - ret = regmap_write(miim->phy_regs, MSCC_PHY_REG_PHY_CFG, 0);
> + ret = regmap_write(miim->phy_regs,
> + MSCC_PHY_REG_PHY_CFG + offset, 0);
> if (ret < 0) {
> WARN_ONCE(1, "mscc reset set error %d\n", ret);
> return ret;
> }
>
> - ret = regmap_write(miim->phy_regs, MSCC_PHY_REG_PHY_CFG, 0x1ff);
> + ret = regmap_write(miim->phy_regs,
> + MSCC_PHY_REG_PHY_CFG + offset, 0x1ff);
> if (ret < 0) {
> WARN_ONCE(1, "mscc reset clear error %d\n", ret);
> return ret;
> @@ -176,8 +187,9 @@ static const struct regmap_config mscc_miim_regmap_config = {
> .reg_stride = 4,
> };
>
> -static int mscc_miim_setup(struct device *dev, struct mii_bus **pbus,
> - struct regmap *mii_regmap, struct regmap *phy_regmap)
> +int mscc_miim_setup(struct device *dev, struct mii_bus **pbus, const char *name,
> + struct regmap *mii_regmap, int status_offset,
> + struct regmap *phy_regmap, int reset_offset)
> {
> struct mscc_miim_dev *miim;
> struct mii_bus *bus;
> @@ -186,7 +198,7 @@ static int mscc_miim_setup(struct device *dev, struct mii_bus **pbus,
> if (!bus)
> return -ENOMEM;
>
> - bus->name = "mscc_miim";
> + bus->name = name;
> bus->read = mscc_miim_read;
> bus->write = mscc_miim_write;
> bus->reset = mscc_miim_reset;
> @@ -198,10 +210,15 @@ static int mscc_miim_setup(struct device *dev, struct mii_bus **pbus,
> *pbus = bus;
>
> miim->regs = mii_regmap;
> + miim->mii_status_offset = status_offset;
> miim->phy_regs = phy_regmap;
> + miim->phy_reset_offset = reset_offset;

The reset_offset is unused. Will vsc7514_spi need it?

> +
> + *pbus = bus;
>
> return 0;
> }
> +EXPORT_SYMBOL(mscc_miim_setup);
>
> static int mscc_miim_probe(struct platform_device *pdev)
> {
> @@ -238,7 +255,8 @@ static int mscc_miim_probe(struct platform_device *pdev)
> return PTR_ERR(dev->phy_regs);
> }
>
> - ret = mscc_miim_setup(&pdev->dev, &bus, mii_regmap, phy_regmap);
> + ret = mscc_miim_setup(&pdev->dev, &bus, "mscc_miim", mii_regmap, 0,
> + phy_regmap, 0);
> if (ret < 0) {
> dev_err(&pdev->dev, "Unable to setup the MDIO bus\n");
> return ret;
> diff --git a/include/linux/mdio/mdio-mscc-miim.h b/include/linux/mdio/mdio-mscc-miim.h
> new file mode 100644
> index 000000000000..69a023cf8991
> --- /dev/null
> +++ b/include/linux/mdio/mdio-mscc-miim.h
> @@ -0,0 +1,20 @@
> +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
> +/*
> + * Driver for the MDIO interface of Microsemi network switches.
> + *
> + * Author: Colin Foster <colin.foster@xxxxxxxxxxxxxxxx>
> + * Copyright (C) 2021 Innovative Advantage
> + */
> +#ifndef MDIO_MSCC_MIIM_H
> +#define MDIO_MSCC_MIIM_H
> +
> +#include <linux/device.h>
> +#include <linux/phy.h>
> +#include <linux/regmap.h>
> +
> +int mscc_miim_setup(struct device *device, struct mii_bus **bus,
> + const char *name, struct regmap *mii_regmap,
> + int status_offset, struct regmap *phy_regmap,
> + int reset_offset);
> +
> +#endif
> diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
> index 89d17629efe5..9d6fe8ce9dd1 100644
> --- a/include/soc/mscc/ocelot.h
> +++ b/include/soc/mscc/ocelot.h
> @@ -398,6 +398,7 @@ enum ocelot_reg {
> GCB_MIIM_MII_STATUS,
> GCB_MIIM_MII_CMD,
> GCB_MIIM_MII_DATA,
> + GCB_PHY_PHY_CFG,

This appears extraneous, you are still using MSCC_PHY_REG_PHY_CFG.

> DEV_CLOCK_CFG = DEV_GMII << TARGET_OFFSET,
> DEV_PORT_MISC,
> DEV_EVENTS,
> --
> 2.25.1
>

Next message: Dmitry Osipenko: "Re: [PATCH v4] i2c: tegra: Add the ACPI support"
Previous message: Dave Airlie: "[git pull] drm fixes for 5.16-rc3"
In reply to: Colin Foster: "[PATCH v2 net-next 3/3] net: dsa: ocelot: felix: utilize shared mscc-miim driver for indirect MDIO access"
Next in thread: Colin Foster: "Re: [PATCH v2 net-next 3/3] net: dsa: ocelot: felix: utilize shared mscc-miim driver for indirect MDIO access"
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