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pata_mpc52xx: reduce code size by simple change of constant data types

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I've prepared a totally simple patch that, if I did it and measured it
correctly, reduces the text size as of the ppc-6xx-size command of
pata-mpc52xx by more than 10%, by reducing the rodata size from 0x4a4
to 0x17e bytes. This is simply done by changing the data types of the
ATA timing constants.

If you are interested at all, and it's worth the trouble, here the
details:

ppc-6xx-size:
     text data bss  dec  hex filename
old: 6532 1068   0 7600 1db0 pata-mpc52xx.o
new: 5718 1068   0 6786 1a82 pata-mpc52xx.o

The (assembler) code itself doesn't really change very much. I double
checked the final results inside mpc52xx-ata-apply-timings() and they
match. The driver is still working fine of course.

Signed-off-by: Roman Fietze <roman.fietze@telemotive.de>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Roman Fietze 2010-03-05 08:27:39 +01:00 committed by Jeff Garzik
parent 441577efa0
commit ec569af858
1 changed files with 39 additions and 39 deletions
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78
drivers/ata/pata_mpc52xx.c
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@ -64,13 +64,13 @@ struct mpc52xx_ata_priv {
/* ATAPI-4 PIO specs (in ns) */ /* ATAPI-4 PIO specs (in ns) */
static const int ataspec_t0[5] = {600, 383, 240, 180, 120}; static const u16 ataspec_t0[5] = {600, 383, 240, 180, 120};
static const int ataspec_t1[5] = { 70, 50, 30, 30, 25}; static const u16 ataspec_t1[5] = { 70, 50, 30, 30, 25};
static const int ataspec_t2_8[5] = {290, 290, 290, 80, 70}; static const u16 ataspec_t2_8[5] = {290, 290, 290, 80, 70};
static const int ataspec_t2_16[5] = {165, 125, 100, 80, 70}; static const u16 ataspec_t2_16[5] = {165, 125, 100, 80, 70};
static const int ataspec_t2i[5] = { 0, 0, 0, 70, 25}; static const u16 ataspec_t2i[5] = { 0, 0, 0, 70, 25};
static const int ataspec_t4[5] = { 30, 20, 15, 10, 10}; static const u16 ataspec_t4[5] = { 30, 20, 15, 10, 10};
static const int ataspec_ta[5] = { 35, 35, 35, 35, 35}; static const u16 ataspec_ta[5] = { 35, 35, 35, 35, 35};
#define CALC_CLKCYC(c,v) ((((v)+(c)-1)/(c))) #define CALC_CLKCYC(c,v) ((((v)+(c)-1)/(c)))
@ -78,13 +78,13 @@ static const int ataspec_ta[5] = { 35, 35, 35, 35, 35};
/* ATAPI-4 MDMA specs (in clocks) */ /* ATAPI-4 MDMA specs (in clocks) */
struct mdmaspec { struct mdmaspec {
u32 t0M; u8 t0M;
u32 td; u8 td;
u32 th; u8 th;
u32 tj; u8 tj;
u32 tkw; u8 tkw;
u32 tm; u8 tm;
u32 tn; u8 tn;
}; };
static const struct mdmaspec mdmaspec66[3] = { static const struct mdmaspec mdmaspec66[3] = {
@ -101,23 +101,23 @@ static const struct mdmaspec mdmaspec132[3] = {
/* ATAPI-4 UDMA specs (in clocks) */ /* ATAPI-4 UDMA specs (in clocks) */
struct udmaspec { struct udmaspec {
u32 tcyc; u8 tcyc;
u32 t2cyc; u8 t2cyc;
u32 tds; u8 tds;
u32 tdh; u8 tdh;
u32 tdvs; u8 tdvs;
u32 tdvh; u8 tdvh;
u32 tfs; u8 tfs;
u32 tli; u8 tli;
u32 tmli; u8 tmli;
u32 taz; u8 taz;
u32 tzah; u8 tzah;
u32 tenv; u8 tenv;
u32 tsr; u8 tsr;
u32 trfs; u8 trfs;
u32 trp; u8 trp;
u32 tack; u8 tack;
u32 tss; u8 tss;
}; };
static const struct udmaspec udmaspec66[6] = { static const struct udmaspec udmaspec66[6] = {
@ -270,7 +270,7 @@ mpc52xx_ata_compute_pio_timings(struct mpc52xx_ata_priv *priv, int dev, int pio)
{ {
struct mpc52xx_ata_timings *timing = &priv->timings[dev]; struct mpc52xx_ata_timings *timing = &priv->timings[dev];
unsigned int ipb_period = priv->ipb_period; unsigned int ipb_period = priv->ipb_period;
unsigned int t0, t1, t2_8, t2_16, t2i, t4, ta; u32 t0, t1, t2_8, t2_16, t2i, t4, ta;
if ((pio < 0) || (pio > 4)) if ((pio < 0) || (pio > 4))
return -EINVAL; return -EINVAL;
@ -299,8 +299,8 @@ mpc52xx_ata_compute_mdma_timings(struct mpc52xx_ata_priv *priv, int dev,
if (speed < 0 || speed > 2) if (speed < 0 || speed > 2)
return -EINVAL; return -EINVAL;
t->mdma1 = (s->t0M << 24) | (s->td << 16) | (s->tkw << 8) | (s->tm); t->mdma1 = ((u32)s->t0M << 24) | ((u32)s->td << 16) | ((u32)s->tkw << 8) | s->tm;
t->mdma2 = (s->th << 24) | (s->tj << 16) | (s->tn << 8); t->mdma2 = ((u32)s->th << 24) | ((u32)s->tj << 16) | ((u32)s->tn << 8);
t->using_udma = 0; t->using_udma = 0;
return 0; return 0;
@ -316,11 +316,11 @@ mpc52xx_ata_compute_udma_timings(struct mpc52xx_ata_priv *priv, int dev,
if (speed < 0 || speed > 2) if (speed < 0 || speed > 2)
return -EINVAL; return -EINVAL;
t->udma1 = (s->t2cyc << 24) | (s->tcyc << 16) | (s->tds << 8) | s->tdh; t->udma1 = ((u32)s->t2cyc << 24) | ((u32)s->tcyc << 16) | ((u32)s->tds << 8) | s->tdh;
t->udma2 = (s->tdvs << 24) | (s->tdvh << 16) | (s->tfs << 8) | s->tli; t->udma2 = ((u32)s->tdvs << 24) | ((u32)s->tdvh << 16) | ((u32)s->tfs << 8) | s->tli;
t->udma3 = (s->tmli << 24) | (s->taz << 16) | (s->tenv << 8) | s->tsr; t->udma3 = ((u32)s->tmli << 24) | ((u32)s->taz << 16) | ((u32)s->tenv << 8) | s->tsr;
t->udma4 = (s->tss << 24) | (s->trfs << 16) | (s->trp << 8) | s->tack; t->udma4 = ((u32)s->tss << 24) | ((u32)s->trfs << 16) | ((u32)s->trp << 8) | s->tack;
t->udma5 = (s->tzah << 24); t->udma5 = (u32)s->tzah << 24;
t->using_udma = 1; t->using_udma = 1;
return 0; return 0;