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Do not start/stop DMA transfer if it is already started/stopped.

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This commit is contained in:
Seigo Tanimura 2000-01-03 05:26:12 +00:00
parent f259d7eed5
commit 769309aaf2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=55321
1 changed files with 41 additions and 22 deletions
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63
sys/dev/sound/pci/csapcm.c
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@ -49,6 +49,7 @@ struct csa_chinfo {
snd_dbuf *buffer;
int dir;
u_int32_t fmt;
int dma;
};
struct csa_info {
@ -408,11 +409,14 @@ csa_startplaydma(struct csa_info *csa)
csa_res *resp;
u_long ul;
resp = &csa->res;
ul = csa_readmem(resp, BA1_PCTL);
ul &= 0x0000ffff;
csa_writemem(resp, BA1_PCTL, ul | csa->pctl);
csa_writemem(resp, BA1_PVOL, 0x80008000);
if (!csa->pch.dma) {
resp = &csa->res;
ul = csa_readmem(resp, BA1_PCTL);
ul &= 0x0000ffff;
csa_writemem(resp, BA1_PCTL, ul | csa->pctl);
csa_writemem(resp, BA1_PVOL, 0x80008000);
csa->pch.dma = 1;
}
}
static void
@ -421,11 +425,14 @@ csa_startcapturedma(struct csa_info *csa)
csa_res *resp;
u_long ul;
resp = &csa->res;
ul = csa_readmem(resp, BA1_CCTL);
ul &= 0xffff0000;
csa_writemem(resp, BA1_CCTL, ul | csa->cctl);
csa_writemem(resp, BA1_CVOL, 0x80008000);
if (!csa->rch.dma) {
resp = &csa->res;
ul = csa_readmem(resp, BA1_CCTL);
ul &= 0xffff0000;
csa_writemem(resp, BA1_CCTL, ul | csa->cctl);
csa_writemem(resp, BA1_CVOL, 0x80008000);
csa->rch.dma = 1;
}
}
static void
@ -434,14 +441,17 @@ csa_stopplaydma(struct csa_info *csa)
csa_res *resp;
u_long ul;
resp = &csa->res;
ul = csa_readmem(resp, BA1_PCTL);
csa->pctl = ul & 0xffff0000;
csa_writemem(resp, BA1_PCTL, ul & 0x0000ffff);
csa_writemem(resp, BA1_PVOL, 0xffffffff);
if (csa->pch.dma) {
resp = &csa->res;
ul = csa_readmem(resp, BA1_PCTL);
csa->pctl = ul & 0xffff0000;
csa_writemem(resp, BA1_PCTL, ul & 0x0000ffff);
csa_writemem(resp, BA1_PVOL, 0xffffffff);
/* Clear the serial fifos. */
csa_clearserialfifos(resp);
/* Clear the serial fifos. */
csa_clearserialfifos(resp);
csa->pch.dma = 0;
}
}
static void
@ -450,11 +460,14 @@ csa_stopcapturedma(struct csa_info *csa)
csa_res *resp;
u_long ul;
resp = &csa->res;
ul = csa_readmem(resp, BA1_CCTL);
csa->cctl = ul & 0x0000ffff;
csa_writemem(resp, BA1_CCTL, ul & 0xffff0000);
csa_writemem(resp, BA1_CVOL, 0xffffffff);
if (csa->rch.dma) {
resp = &csa->res;
ul = csa_readmem(resp, BA1_CCTL);
csa->cctl = ul & 0x0000ffff;
csa_writemem(resp, BA1_CCTL, ul & 0xffff0000);
csa_writemem(resp, BA1_CVOL, 0xffffffff);
csa->rch.dma = 0;
}
}
static void
@ -754,6 +767,12 @@ pcmcsa_attach(device_t dev)
unit = device_get_unit(dev);
func = device_get_ivars(dev);
csa->binfo = func->varinfo;
/*
* Fake the status of DMA so that the initial value of
* PCTL and CCTL can be stored into csa->pctl and csa->cctl,
* respectively.
*/
csa->pch.dma = csa->rch.dma = 1;
/* Allocate the resources. */
resp = &csa->res;