[PATCH net-next v3 2/9] net: sunhme: Remove residual polling code

Sean Anderson
2023-03-14T00:36:49Z

The sunhme driver never used the hardware MII polling feature. Even the
if-def'd out happy_meal_poll_start was removed by 2002 [1]. Remove the
various places in the driver which needlessly guard against MII interrupts
which will never be enabled.

[1] https://lwn.net/2002/0411/a/2.5.8-pre3.php3

Signed-off-by: Sean Anderson <seanga2@gmail.com>
---

(no changes since v1)

drivers/net/ethernet/sun/sunhme.c | 134 ++++--------------------------
drivers/net/ethernet/sun/sunhme.h | 6 +-
2 files changed, 18 insertions(+), 122 deletions(-)

diff --git a/drivers/net/ethernet/sun/sunhme.c b/drivers/net/ethernet/sun/sunhme.c
index 65733ee5ddd9..6bcafe820a9e 100644
--- a/drivers/net/ethernet/sun/sunhme.c
+++ b/drivers/net/ethernet/sun/sunhme.c
@@ -985,32 +985,6 @@ static void happy_meal_get_counters(struct happy_meal *hp, void __iomem *bregs)
hme_write32(hp, bregs + BMAC_LTCTR, 0);
}

-/* hp->happy_lock must be held */
-static void happy_meal_poll_stop(struct happy_meal *hp, void __iomem *tregs)
-{
- /* If polling disabled or not polling already, nothing to do. */
- if ((hp->happy_flags & (HFLAG_POLLENABLE | HFLAG_POLL)) !=
- (HFLAG_POLLENABLE | HFLAG_POLL)) {
- ASD("not polling, return\n");
- return;
- }
-
- /* Shut up the MIF. */
- ASD("were polling, mif ints off, polling off\n");
- hme_write32(hp, tregs + TCVR_IMASK, 0xffff);
-
- /* Turn off polling. */
- hme_write32(hp, tregs + TCVR_CFG,
- hme_read32(hp, tregs + TCVR_CFG) & ~(TCV_CFG_PENABLE));
-
- /* We are no longer polling. */
- hp->happy_flags &= ~(HFLAG_POLL);
-
- /* Let the bits set. */
- udelay(200);
- ASD("done\n");
-}
-
/* Only Sun can take such nice parts and fuck up the programming interface
* like this. Good job guys...
*/
@@ -1115,57 +1089,26 @@ static int happy_meal_tcvr_reset(struct happy_meal *hp, void __iomem *tregs)
static void happy_meal_transceiver_check(struct happy_meal *hp, void __iomem *tregs)
{
unsigned long tconfig = hme_read32(hp, tregs + TCVR_CFG);
+ u32 reread = hme_read32(hp, tregs + TCVR_CFG);

ASD("tcfg=%08lx\n", tconfig);
- if (hp->happy_flags & HFLAG_POLL) {
- /* If we are polling, we must stop to get the transceiver type. */
- if (hp->tcvr_type == internal) {
- if (tconfig & TCV_CFG_MDIO1) {
- happy_meal_poll_stop(hp, tregs);
- hp->paddr = TCV_PADDR_ETX;
- hp->tcvr_type = external;
- tconfig &= ~(TCV_CFG_PENABLE);
- tconfig |= TCV_CFG_PSELECT;
- hme_write32(hp, tregs + TCVR_CFG, tconfig);
- ASD("poll stop, internal->external\n");
- }
- } else {
- if (hp->tcvr_type == external) {
- if (!(hme_read32(hp, tregs + TCVR_STATUS) >> 16)) {
- happy_meal_poll_stop(hp, tregs);
- hp->paddr = TCV_PADDR_ITX;
- hp->tcvr_type = internal;
- hme_write32(hp, tregs + TCVR_CFG,
- hme_read32(hp, tregs + TCVR_CFG) &
- ~(TCV_CFG_PSELECT));
- ASD("poll stop, external->internal\n");
- }
- } else {
- ASD("polling, none\n");
- }
- }
+ if (reread & TCV_CFG_MDIO1) {
+ hme_write32(hp, tregs + TCVR_CFG, tconfig | TCV_CFG_PSELECT);
+ hp->paddr = TCV_PADDR_ETX;
+ hp->tcvr_type = external;
+ ASD("not polling, external\n");
} else {
- u32 reread = hme_read32(hp, tregs + TCVR_CFG);
-
- /* Else we can just work off of the MDIO bits. */
- if (reread & TCV_CFG_MDIO1) {
- hme_write32(hp, tregs + TCVR_CFG, tconfig | TCV_CFG_PSELECT);
- hp->paddr = TCV_PADDR_ETX;
- hp->tcvr_type = external;
- ASD("not polling, external\n");
+ if (reread & TCV_CFG_MDIO0) {
+ hme_write32(hp, tregs + TCVR_CFG,
+ tconfig & ~(TCV_CFG_PSELECT));
+ hp->paddr = TCV_PADDR_ITX;
+ hp->tcvr_type = internal;
+ ASD("not polling, internal\n");
} else {
- if (reread & TCV_CFG_MDIO0) {
- hme_write32(hp, tregs + TCVR_CFG,
- tconfig & ~(TCV_CFG_PSELECT));
- hp->paddr = TCV_PADDR_ITX;
- hp->tcvr_type = internal;
- ASD("not polling, internal\n");
- } else {
- netdev_err(hp->dev,
- "Transceiver and a coke please.");
- hp->tcvr_type = none; /* Grrr... */
- ASD("not polling, none\n");
- }
+ netdev_err(hp->dev,
+ "Transceiver and a coke please.");
+ hp->tcvr_type = none; /* Grrr... */
+ ASD("not polling, none\n");
}
}
}
@@ -1334,10 +1277,6 @@ static int happy_meal_init(struct happy_meal *hp)
happy_meal_get_counters(hp, bregs);
}

- /* Stop polling. */
- HMD("to happy_meal_poll_stop\n");
- happy_meal_poll_stop(hp, tregs);
-
/* Stop transmitter and receiver. */
HMD("to happy_meal_stop\n");
happy_meal_stop(hp, gregs);
@@ -1346,11 +1285,6 @@ static int happy_meal_init(struct happy_meal *hp)
HMD("to happy_meal_init_rings\n");
happy_meal_init_rings(hp);

- /* Shut up the MIF. */
- HMD("Disable all MIF irqs (old[%08x])\n",
- hme_read32(hp, tregs + TCVR_IMASK));
- hme_write32(hp, tregs + TCVR_IMASK, 0xffff);
-
/* See if we can enable the MIF frame on this card to speak to the DP83840. */
if (hp->happy_flags & HFLAG_FENABLE) {
HMD("use frame old[%08x]\n",
@@ -1605,7 +1539,6 @@ static void happy_meal_set_initial_advertisement(struct happy_meal *hp)
void __iomem *gregs = hp->gregs;

happy_meal_stop(hp, gregs);
- hme_write32(hp, tregs + TCVR_IMASK, 0xffff);
if (hp->happy_flags & HFLAG_FENABLE)
hme_write32(hp, tregs + TCVR_CFG,
hme_read32(hp, tregs + TCVR_CFG) & ~(TCV_CFG_BENABLE));
@@ -1762,34 +1695,6 @@ static int happy_meal_is_not_so_happy(struct happy_meal *hp, u32 status)
return 0;
}

-/* hp->happy_lock must be held */
-static void happy_meal_mif_interrupt(struct happy_meal *hp)
-{
- void __iomem *tregs = hp->tcvregs;
-
- netdev_info(hp->dev, "Link status change.\n");
- hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
- hp->sw_lpa = happy_meal_tcvr_read(hp, tregs, MII_LPA);
-
- /* Use the fastest transmission protocol possible. */
- if (hp->sw_lpa & LPA_100FULL) {
- netdev_info(hp->dev, "Switching to 100Mbps at full duplex.\n");
- hp->sw_bmcr |= (BMCR_FULLDPLX | BMCR_SPEED100);
- } else if (hp->sw_lpa & LPA_100HALF) {
- netdev_info(hp->dev, "Switching to 100MBps at half duplex.\n");
- hp->sw_bmcr |= BMCR_SPEED100;
- } else if (hp->sw_lpa & LPA_10FULL) {
- netdev_info(hp->dev, "Switching to 10MBps at full duplex.\n");
- hp->sw_bmcr |= BMCR_FULLDPLX;
- } else {
- netdev_info(hp->dev, "Using 10Mbps at half duplex.\n");
- }
- happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);
-
- /* Finally stop polling and shut up the MIF. */
- happy_meal_poll_stop(hp, tregs);
-}
-
/* hp->happy_lock must be held */
static void happy_meal_tx(struct happy_meal *hp)
{
@@ -1973,9 +1878,6 @@ static irqreturn_t happy_meal_interrupt(int irq, void *dev_id)
goto out;
}

- if (happy_status & GREG_STAT_MIFIRQ)
- happy_meal_mif_interrupt(hp);
-
if (happy_status & GREG_STAT_TXALL)
happy_meal_tx(hp);

@@ -2003,7 +1905,6 @@ static irqreturn_t quattro_sbus_interrupt(int irq, void *cookie)
HMD("status=%08x\n", happy_status);

if (!(happy_status & (GREG_STAT_ERRORS |
- GREG_STAT_MIFIRQ |
GREG_STAT_TXALL |
GREG_STAT_RXTOHOST)))
continue;
@@ -2014,9 +1915,6 @@ static irqreturn_t quattro_sbus_interrupt(int irq, void *cookie)
if (happy_meal_is_not_so_happy(hp, happy_status))
goto next;

- if (happy_status & GREG_STAT_MIFIRQ)
- happy_meal_mif_interrupt(hp);
-
if (happy_status & GREG_STAT_TXALL)
happy_meal_tx(hp);

diff --git a/drivers/net/ethernet/sun/sunhme.h b/drivers/net/ethernet/sun/sunhme.h
index 9118c60c9426..258b4c7fe962 100644
--- a/drivers/net/ethernet/sun/sunhme.h
+++ b/drivers/net/ethernet/sun/sunhme.h
@@ -462,22 +462,20 @@ struct happy_meal {
};

/* Here are the happy flags. */
-#define HFLAG_POLL 0x00000001 /* We are doing MIF polling */
#define HFLAG_FENABLE 0x00000002 /* The MII frame is enabled */
#define HFLAG_LANCE 0x00000004 /* We are using lance-mode */
#define HFLAG_RXENABLE 0x00000008 /* Receiver is enabled */
#define HFLAG_AUTO 0x00000010 /* Using auto-negotiation, 0 = force */
#define HFLAG_FULL 0x00000020 /* Full duplex enable */
#define HFLAG_MACFULL 0x00000040 /* Using full duplex in the MAC */
-#define HFLAG_POLLENABLE 0x00000080 /* Actually try MIF polling */
#define HFLAG_RXCV 0x00000100 /* XXX RXCV ENABLE */
#define HFLAG_INIT 0x00000200 /* Init called at least once */
#define HFLAG_LINKUP 0x00000400 /* 1 = Link is up */
#define HFLAG_PCI 0x00000800 /* PCI based Happy Meal */
#define HFLAG_QUATTRO 0x00001000 /* On QFE/Quattro card */

-#define HFLAG_20_21 (HFLAG_POLLENABLE | HFLAG_FENABLE)
-#define HFLAG_NOT_A0 (HFLAG_POLLENABLE | HFLAG_FENABLE | HFLAG_LANCE | HFLAG_RXCV)
+#define HFLAG_20_21 HFLAG_FENABLE
+#define HFLAG_NOT_A0 (HFLAG_FENABLE | HFLAG_LANCE | HFLAG_RXCV)

/* Support for QFE/Quattro cards. */
struct quattro {
--
2.37.1