[PATCH 2/3] fec_main: removed PHY functions

From: Apeksha Gupta
Date: Wed Nov 10 2021 - 00:36:51 EST

Moved the phy related API in separate 'fec_phy.c' file.
Splitting the PHY functionality from main FEC driver.

Signed-off-by: Sachin Saxena <sachin.saxena@xxxxxxx>
Signed-off-by: Apeksha Gupta <apeksha.gupta@xxxxxxx>
---
drivers/net/ethernet/freescale/fec_main.c | 495 +---------------------
1 file changed, 4 insertions(+), 491 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index ec87b370bba1..d8860c0d9fca 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -20,6 +20,9 @@
* Copyright (c) 2004-2006 Macq Electronique SA.
*
* Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
+ *
+ * Moved the PHY code to fec_phy.c
+ * Copyright 2021 NXP
*/

#include <linux/module.h>
@@ -70,6 +73,7 @@
#include <asm/cacheflush.h>

#include "fec.h"
+#include "fec_phy.h"

static void set_multicast_list(struct net_device *ndev);
static void fec_enet_itr_coal_init(struct net_device *ndev);
@@ -85,7 +89,6 @@ static const u16 fec_enet_vlan_pri_to_queue[8] = {0, 0, 1, 1, 1, 2, 2, 2};
#define FEC_ENET_RAEM_V 0x8
#define FEC_ENET_RAFL_V 0x8
#define FEC_ENET_OPD_V 0xFFF0
-#define FEC_MDIO_PM_TIMEOUT 100 /* ms */

struct fec_devinfo {
u32 quirks;
@@ -273,17 +276,6 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
#define OPT_FRAME_SIZE 0
#endif

-/* FEC MII MMFR bits definition */
-#define FEC_MMFR_ST (1 << 30)
-#define FEC_MMFR_ST_C45 (0)
-#define FEC_MMFR_OP_READ (2 << 28)
-#define FEC_MMFR_OP_READ_C45 (3 << 28)
-#define FEC_MMFR_OP_WRITE (1 << 28)
-#define FEC_MMFR_OP_ADDR_WRITE (0)
-#define FEC_MMFR_PA(v) ((v & 0x1f) << 23)
-#define FEC_MMFR_RA(v) ((v & 0x1f) << 18)
-#define FEC_MMFR_TA (2 << 16)
-#define FEC_MMFR_DATA(v) (v & 0xffff)
/* FEC ECR bits definition */
#define FEC_ECR_MAGICEN (1 << 2)
#define FEC_ECR_SLEEP (1 << 3)
@@ -309,8 +301,6 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
((addr >= txq->tso_hdrs_dma) && \
(addr < txq->tso_hdrs_dma + txq->bd.ring_size * TSO_HEADER_SIZE))

-static int mii_cnt;
-
static struct bufdesc *fec_enet_get_nextdesc(struct bufdesc *bdp,
struct bufdesc_prop *bd)
{
@@ -1779,208 +1769,6 @@ static int fec_get_mac(struct net_device *ndev)

/* ------------------------------------------------------------------------- */

-/*
- * Phy section
- */
-static void fec_enet_adjust_link(struct net_device *ndev)
-{
- struct fec_enet_private *fep = netdev_priv(ndev);
- struct phy_device *phy_dev = ndev->phydev;
- int status_change = 0;
-
- /*
- * If the netdev is down, or is going down, we're not interested
- * in link state events, so just mark our idea of the link as down
- * and ignore the event.
- */
- if (!netif_running(ndev) || !netif_device_present(ndev)) {
- fep->link = 0;
- } else if (phy_dev->link) {
- if (!fep->link) {
- fep->link = phy_dev->link;
- status_change = 1;
- }
-
- if (fep->full_duplex != phy_dev->duplex) {
- fep->full_duplex = phy_dev->duplex;
- status_change = 1;
- }
-
- if (phy_dev->speed != fep->speed) {
- fep->speed = phy_dev->speed;
- status_change = 1;
- }
-
- /* if any of the above changed restart the FEC */
- if (status_change) {
- napi_disable(&fep->napi);
- netif_tx_lock_bh(ndev);
- fec_restart(ndev);
- netif_tx_wake_all_queues(ndev);
- netif_tx_unlock_bh(ndev);
- napi_enable(&fep->napi);
- }
- } else {
- if (fep->link) {
- napi_disable(&fep->napi);
- netif_tx_lock_bh(ndev);
- fec_stop(ndev);
- netif_tx_unlock_bh(ndev);
- napi_enable(&fep->napi);
- fep->link = phy_dev->link;
- status_change = 1;
- }
- }
-
- if (status_change)
- phy_print_status(phy_dev);
-}
-
-static int fec_enet_mdio_wait(struct fec_enet_private *fep)
-{
- uint ievent;
- int ret;
-
- ret = readl_poll_timeout_atomic(fep->hwp + FEC_IEVENT, ievent,
- ievent & FEC_ENET_MII, 2, 30000);
-
- if (!ret)
- writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);
-
- return ret;
-}
-
-static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
-{
- struct fec_enet_private *fep = bus->priv;
- struct device *dev = &fep->pdev->dev;
- int ret = 0, frame_start, frame_addr, frame_op;
- bool is_c45 = !!(regnum & MII_ADDR_C45);
-
- ret = pm_runtime_resume_and_get(dev);
- if (ret < 0)
- return ret;
-
- if (is_c45) {
- frame_start = FEC_MMFR_ST_C45;
-
- /* write address */
- frame_addr = (regnum >> 16);
- writel(frame_start | FEC_MMFR_OP_ADDR_WRITE |
- FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(frame_addr) |
- FEC_MMFR_TA | (regnum & 0xFFFF),
- fep->hwp + FEC_MII_DATA);
-
- /* wait for end of transfer */
- ret = fec_enet_mdio_wait(fep);
- if (ret) {
- netdev_err(fep->netdev, "MDIO address write timeout\n");
- goto out;
- }
-
- frame_op = FEC_MMFR_OP_READ_C45;
-
- } else {
- /* C22 read */
- frame_op = FEC_MMFR_OP_READ;
- frame_start = FEC_MMFR_ST;
- frame_addr = regnum;
- }
-
- /* start a read op */
- writel(frame_start | frame_op |
- FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(frame_addr) |
- FEC_MMFR_TA, fep->hwp + FEC_MII_DATA);
-
- /* wait for end of transfer */
- ret = fec_enet_mdio_wait(fep);
- if (ret) {
- netdev_err(fep->netdev, "MDIO read timeout\n");
- goto out;
- }
-
- ret = FEC_MMFR_DATA(readl(fep->hwp + FEC_MII_DATA));
-
-out:
- pm_runtime_mark_last_busy(dev);
- pm_runtime_put_autosuspend(dev);
-
- return ret;
-}
-
-static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
- u16 value)
-{
- struct fec_enet_private *fep = bus->priv;
- struct device *dev = &fep->pdev->dev;
- int ret, frame_start, frame_addr;
- bool is_c45 = !!(regnum & MII_ADDR_C45);
-
- ret = pm_runtime_resume_and_get(dev);
- if (ret < 0)
- return ret;
-
- if (is_c45) {
- frame_start = FEC_MMFR_ST_C45;
-
- /* write address */
- frame_addr = (regnum >> 16);
- writel(frame_start | FEC_MMFR_OP_ADDR_WRITE |
- FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(frame_addr) |
- FEC_MMFR_TA | (regnum & 0xFFFF),
- fep->hwp + FEC_MII_DATA);
-
- /* wait for end of transfer */
- ret = fec_enet_mdio_wait(fep);
- if (ret) {
- netdev_err(fep->netdev, "MDIO address write timeout\n");
- goto out;
- }
- } else {
- /* C22 write */
- frame_start = FEC_MMFR_ST;
- frame_addr = regnum;
- }
-
- /* start a write op */
- writel(frame_start | FEC_MMFR_OP_WRITE |
- FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(frame_addr) |
- FEC_MMFR_TA | FEC_MMFR_DATA(value),
- fep->hwp + FEC_MII_DATA);
-
- /* wait for end of transfer */
- ret = fec_enet_mdio_wait(fep);
- if (ret)
- netdev_err(fep->netdev, "MDIO write timeout\n");
-
-out:
- pm_runtime_mark_last_busy(dev);
- pm_runtime_put_autosuspend(dev);
-
- return ret;
-}
-
-static void fec_enet_phy_reset_after_clk_enable(struct net_device *ndev)
-{
- struct fec_enet_private *fep = netdev_priv(ndev);
- struct phy_device *phy_dev = ndev->phydev;
-
- if (phy_dev) {
- phy_reset_after_clk_enable(phy_dev);
- } else if (fep->phy_node) {
- /*
- * If the PHY still is not bound to the MAC, but there is
- * OF PHY node and a matching PHY device instance already,
- * use the OF PHY node to obtain the PHY device instance,
- * and then use that PHY device instance when triggering
- * the PHY reset.
- */
- phy_dev = of_phy_find_device(fep->phy_node);
- phy_reset_after_clk_enable(phy_dev);
- put_device(&phy_dev->mdio.dev);
- }
-}
-
static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
{
struct fec_enet_private *fep = netdev_priv(ndev);
@@ -2070,215 +1858,6 @@ static int fec_enet_parse_rgmii_delay(struct fec_enet_private *fep,
return 0;
}

-static int fec_enet_mii_probe(struct net_device *ndev)
-{
- struct fec_enet_private *fep = netdev_priv(ndev);
- struct phy_device *phy_dev = NULL;
- char mdio_bus_id[MII_BUS_ID_SIZE];
- char phy_name[MII_BUS_ID_SIZE + 3];
- int phy_id;
- int dev_id = fep->dev_id;
-
- if (fep->phy_node) {
- phy_dev = of_phy_connect(ndev, fep->phy_node,
- &fec_enet_adjust_link, 0,
- fep->phy_interface);
- if (!phy_dev) {
- netdev_err(ndev, "Unable to connect to phy\n");
- return -ENODEV;
- }
- } else {
- /* check for attached phy */
- for (phy_id = 0; (phy_id < PHY_MAX_ADDR); phy_id++) {
- if (!mdiobus_is_registered_device(fep->mii_bus, phy_id))
- continue;
- if (dev_id--)
- continue;
- strlcpy(mdio_bus_id, fep->mii_bus->id, MII_BUS_ID_SIZE);
- break;
- }
-
- if (phy_id >= PHY_MAX_ADDR) {
- netdev_info(ndev, "no PHY, assuming direct connection to switch\n");
- strlcpy(mdio_bus_id, "fixed-0", MII_BUS_ID_SIZE);
- phy_id = 0;
- }
-
- snprintf(phy_name, sizeof(phy_name),
- PHY_ID_FMT, mdio_bus_id, phy_id);
- phy_dev = phy_connect(ndev, phy_name, &fec_enet_adjust_link,
- fep->phy_interface);
- }
-
- if (IS_ERR(phy_dev)) {
- netdev_err(ndev, "could not attach to PHY\n");
- return PTR_ERR(phy_dev);
- }
-
- /* mask with MAC supported features */
- if (fep->quirks & FEC_QUIRK_HAS_GBIT) {
- phy_set_max_speed(phy_dev, 1000);
- phy_remove_link_mode(phy_dev,
- ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
-#if !defined(CONFIG_M5272)
- phy_support_sym_pause(phy_dev);
-#endif
- }
- else
- phy_set_max_speed(phy_dev, 100);
-
- fep->link = 0;
- fep->full_duplex = 0;
-
- phy_dev->mac_managed_pm = 1;
-
- phy_attached_info(phy_dev);
-
- return 0;
-}
-
-static int fec_enet_mii_init(struct platform_device *pdev)
-{
- static struct mii_bus *fec0_mii_bus;
- struct net_device *ndev = platform_get_drvdata(pdev);
- struct fec_enet_private *fep = netdev_priv(ndev);
- bool suppress_preamble = false;
- struct device_node *node;
- int err = -ENXIO;
- u32 mii_speed, holdtime;
- u32 bus_freq;
-
- /*
- * The i.MX28 dual fec interfaces are not equal.
- * Here are the differences:
- *
- * - fec0 supports MII & RMII modes while fec1 only supports RMII
- * - fec0 acts as the 1588 time master while fec1 is slave
- * - external phys can only be configured by fec0
- *
- * That is to say fec1 can not work independently. It only works
- * when fec0 is working. The reason behind this design is that the
- * second interface is added primarily for Switch mode.
- *
- * Because of the last point above, both phys are attached on fec0
- * mdio interface in board design, and need to be configured by
- * fec0 mii_bus.
- */
- if ((fep->quirks & FEC_QUIRK_SINGLE_MDIO) && fep->dev_id > 0) {
- /* fec1 uses fec0 mii_bus */
- if (mii_cnt && fec0_mii_bus) {
- fep->mii_bus = fec0_mii_bus;
- mii_cnt++;
- return 0;
- }
- return -ENOENT;
- }
-
- bus_freq = 2500000; /* 2.5MHz by default */
- node = of_get_child_by_name(pdev->dev.of_node, "mdio");
- if (node) {
- of_property_read_u32(node, "clock-frequency", &bus_freq);
- suppress_preamble = of_property_read_bool(node,
- "suppress-preamble");
- }
-
- /*
- * Set MII speed (= clk_get_rate() / 2 * phy_speed)
- *
- * The formula for FEC MDC is 'ref_freq / (MII_SPEED x 2)' while
- * for ENET-MAC is 'ref_freq / ((MII_SPEED + 1) x 2)'. The i.MX28
- * Reference Manual has an error on this, and gets fixed on i.MX6Q
- * document.
- */
- mii_speed = DIV_ROUND_UP(clk_get_rate(fep->clk_ipg), bus_freq * 2);
- if (fep->quirks & FEC_QUIRK_ENET_MAC)
- mii_speed--;
- if (mii_speed > 63) {
- dev_err(&pdev->dev,
- "fec clock (%lu) too fast to get right mii speed\n",
- clk_get_rate(fep->clk_ipg));
- err = -EINVAL;
- goto err_out;
- }
-
- /*
- * The i.MX28 and i.MX6 types have another filed in the MSCR (aka
- * MII_SPEED) register that defines the MDIO output hold time. Earlier
- * versions are RAZ there, so just ignore the difference and write the
- * register always.
- * The minimal hold time according to IEE802.3 (clause 22) is 10 ns.
- * HOLDTIME + 1 is the number of clk cycles the fec is holding the
- * output.
- * The HOLDTIME bitfield takes values between 0 and 7 (inclusive).
- * Given that ceil(clkrate / 5000000) <= 64, the calculation for
- * holdtime cannot result in a value greater than 3.
- */
- holdtime = DIV_ROUND_UP(clk_get_rate(fep->clk_ipg), 100000000) - 1;
-
- fep->phy_speed = mii_speed << 1 | holdtime << 8;
-
- if (suppress_preamble)
- fep->phy_speed |= BIT(7);
-
- if (fep->quirks & FEC_QUIRK_CLEAR_SETUP_MII) {
- /* Clear MMFR to avoid to generate MII event by writing MSCR.
- * MII event generation condition:
- * - writing MSCR:
- * - mmfr[31:0]_not_zero & mscr[7:0]_is_zero &
- * mscr_reg_data_in[7:0] != 0
- * - writing MMFR:
- * - mscr[7:0]_not_zero
- */
- writel(0, fep->hwp + FEC_MII_DATA);
- }
-
- writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
-
- /* Clear any pending transaction complete indication */
- writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);
-
- fep->mii_bus = mdiobus_alloc();
- if (fep->mii_bus == NULL) {
- err = -ENOMEM;
- goto err_out;
- }
-
- fep->mii_bus->name = "fec_enet_mii_bus";
- fep->mii_bus->read = fec_enet_mdio_read;
- fep->mii_bus->write = fec_enet_mdio_write;
- snprintf(fep->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
- pdev->name, fep->dev_id + 1);
- fep->mii_bus->priv = fep;
- fep->mii_bus->parent = &pdev->dev;
-
- err = of_mdiobus_register(fep->mii_bus, node);
- if (err)
- goto err_out_free_mdiobus;
- of_node_put(node);
-
- mii_cnt++;
-
- /* save fec0 mii_bus */
- if (fep->quirks & FEC_QUIRK_SINGLE_MDIO)
- fec0_mii_bus = fep->mii_bus;
-
- return 0;
-
-err_out_free_mdiobus:
- mdiobus_free(fep->mii_bus);
-err_out:
- of_node_put(node);
- return err;
-}
-
-static void fec_enet_mii_remove(struct fec_enet_private *fep)
-{
- if (--mii_cnt == 0) {
- mdiobus_unregister(fep->mii_bus);
- mdiobus_free(fep->mii_bus);
- }
-}
-
static void fec_enet_get_drvinfo(struct net_device *ndev,
struct ethtool_drvinfo *info)
{
@@ -3590,72 +3169,6 @@ static int fec_enet_init(struct net_device *ndev)
return ret;
}

-#ifdef CONFIG_OF
-static int fec_reset_phy(struct platform_device *pdev)
-{
- int err, phy_reset;
- bool active_high = false;
- int msec = 1, phy_post_delay = 0;
- struct device_node *np = pdev->dev.of_node;
-
- if (!np)
- return 0;
-
- err = of_property_read_u32(np, "phy-reset-duration", &msec);
- /* A sane reset duration should not be longer than 1s */
- if (!err && msec > 1000)
- msec = 1;
-
- phy_reset = of_get_named_gpio(np, "phy-reset-gpios", 0);
- if (phy_reset == -EPROBE_DEFER)
- return phy_reset;
- else if (!gpio_is_valid(phy_reset))
- return 0;
-
- err = of_property_read_u32(np, "phy-reset-post-delay", &phy_post_delay);
- /* valid reset duration should be less than 1s */
- if (!err && phy_post_delay > 1000)
- return -EINVAL;
-
- active_high = of_property_read_bool(np, "phy-reset-active-high");
-
- err = devm_gpio_request_one(&pdev->dev, phy_reset,
- active_high ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
- "phy-reset");
- if (err) {
- dev_err(&pdev->dev, "failed to get phy-reset-gpios: %d\n", err);
- return err;
- }
-
- if (msec > 20)
- msleep(msec);
- else
- usleep_range(msec * 1000, msec * 1000 + 1000);
-
- gpio_set_value_cansleep(phy_reset, !active_high);
-
- if (!phy_post_delay)
- return 0;
-
- if (phy_post_delay > 20)
- msleep(phy_post_delay);
- else
- usleep_range(phy_post_delay * 1000,
- phy_post_delay * 1000 + 1000);
-
- return 0;
-}
-#else /* CONFIG_OF */
-static int fec_reset_phy(struct platform_device *pdev)
-{
- /*
- * In case of platform probe, the reset has been done
- * by machine code.
- */
- return 0;
-}
-#endif /* CONFIG_OF */
-
static void
fec_enet_get_queue_num(struct platform_device *pdev, int *num_tx, int *num_rx)
{
--
2.17.1