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phy: convert swphy register generation to tabular form 

Convert the swphy register generation to tabular form which allows us
to eliminate multiple switch() statements.  This results in a smaller
object code size, more efficient, and easier to add support for faster
speeds.

Before:

Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000164  00000000  00000000  00000034  2**2

   text    data     bss     dec     hex filename
    388       0       0     388     184 swphy.o

After:

Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         000000fc  00000000  00000000  00000034  2**2
  5 .rodata       00000028  00000000  00000000  00000138  2**2

   text    data     bss     dec     hex filename
    324       0       0     324     144 swphy.o

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2016-06-23 14:50:10 +01:00 committed by David S. Miller
parent 5ae68b0ce1
commit 0629bf17ea
1 changed files with 78 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

143
drivers/net/phy/swphy.c
View File

@ -20,6 +20,72 @@
#include "swphy.h"
struct swmii_regs {
u16 bmcr;
u16 bmsr;
u16 lpa;
u16 lpagb;
};
enum {
SWMII_SPEED_10 = 0,
SWMII_SPEED_100,
SWMII_SPEED_1000,
SWMII_DUPLEX_HALF = 0,
SWMII_DUPLEX_FULL,
};
/*
* These two tables get bitwise-anded together to produce the final result.
* This means the speed table must contain both duplex settings, and the
* duplex table must contain all speed settings.
*/
static const struct swmii_regs speed[] = {
[SWMII_SPEED_10] = {
.bmcr = BMCR_FULLDPLX,
.lpa = LPA_10FULL | LPA_10HALF,
},
[SWMII_SPEED_100] = {
.bmcr = BMCR_FULLDPLX | BMCR_SPEED100,
.bmsr = BMSR_100FULL | BMSR_100HALF,
.lpa = LPA_100FULL | LPA_100HALF,
},
[SWMII_SPEED_1000] = {
.bmcr = BMCR_FULLDPLX | BMCR_SPEED1000,
.bmsr = BMSR_ESTATEN,
.lpagb = LPA_1000FULL | LPA_1000HALF,
},
};
static const struct swmii_regs duplex[] = {
[SWMII_DUPLEX_HALF] = {
.bmcr = ~BMCR_FULLDPLX,
.bmsr = BMSR_ESTATEN | BMSR_100HALF,
.lpa = LPA_10HALF | LPA_100HALF,
.lpagb = LPA_1000HALF,
},
[SWMII_DUPLEX_FULL] = {
.bmcr = ~0,
.bmsr = BMSR_ESTATEN | BMSR_100FULL,
.lpa = LPA_10FULL | LPA_100FULL,
.lpagb = LPA_1000FULL,
},
};
static int swphy_decode_speed(int speed)
{
switch (speed) {
case 1000:
return SWMII_SPEED_1000;
case 100:
return SWMII_SPEED_100;
case 10:
return SWMII_SPEED_10;
default:
return -EINVAL;
}
}
/**
* swphy_update_regs - update MII register array with fixed phy state
* @regs: array of 32 registers to update
@ -30,81 +96,28 @@
*/
int swphy_update_regs(u16 *regs, const struct fixed_phy_status *state)
{
int speed_index, duplex_index;
u16 bmsr = BMSR_ANEGCAPABLE;
u16 bmcr = 0;
u16 lpagb = 0;
u16 lpa = 0;
if (state->duplex) {
switch (state->speed) {
case 1000:
bmsr |= BMSR_ESTATEN;
break;
case 100:
bmsr |= BMSR_100FULL;
break;
case 10:
bmsr |= BMSR_10FULL;
break;
default:
break;
}
} else {
switch (state->speed) {
case 1000:
bmsr |= BMSR_ESTATEN;
break;
case 100:
bmsr |= BMSR_100HALF;
break;
case 10:
bmsr |= BMSR_10HALF;
break;
default:
break;
}
speed_index = swphy_decode_speed(state->speed);
if (speed_index < 0) {
pr_warn("swphy: unknown speed\n");
return -EINVAL;
}
duplex_index = state->duplex ? SWMII_DUPLEX_FULL : SWMII_DUPLEX_HALF;
bmsr |= speed[speed_index].bmsr & duplex[duplex_index].bmsr;
if (state->link) {
bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
if (state->duplex) {
bmcr |= BMCR_FULLDPLX;
switch (state->speed) {
case 1000:
bmcr |= BMCR_SPEED1000;
lpagb |= LPA_1000FULL;
break;
case 100:
bmcr |= BMCR_SPEED100;
lpa |= LPA_100FULL;
break;
case 10:
lpa |= LPA_10FULL;
break;
default:
pr_warn("swphy: unknown speed\n");
return -EINVAL;
}
} else {
switch (state->speed) {
case 1000:
bmcr |= BMCR_SPEED1000;
lpagb |= LPA_1000HALF;
break;
case 100:
bmcr |= BMCR_SPEED100;
lpa |= LPA_100HALF;
break;
case 10:
lpa |= LPA_10HALF;
break;
default:
pr_warn("swphy: unknown speed\n");
return -EINVAL;
}
}
bmcr |= speed[speed_index].bmcr & duplex[duplex_index].bmcr;
lpa |= speed[speed_index].lpa & duplex[duplex_index].lpa;
lpagb |= speed[speed_index].lpagb & duplex[duplex_index].lpagb;
if (state->pause)
lpa |= LPA_PAUSE_CAP;