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minix/lib/libaudiodriver/audio_fw.c
David van Moolenbroek 6331e8f845 Retire the synchronous character driver protocol 
- change all sync char drivers into async drivers;
- retire support for the sync protocol in libchardev;
- remove async dev style, as this is now the default;
- remove dev_status from VFS;
- clean up now-unused protocol messages.

Change-Id: I6aacff712292f6b29f2ccd51bc1e7d7003723e87
2014-02-18 11:25:02 +01:00

1013 lines
28 KiB
C
Raw Blame History

/* Best viewed with tabsize 4
*
* This file contains a standard driver for audio devices.
* It supports double dma buffering and can be configured to use
* extra buffer space beside the dma buffer.
* This driver also support sub devices, which can be independently
* opened and closed.
*
* The driver supports the following operations:
*
* m_type DEVICE USER_ENDPT COUNT POSITION ADRRESS
* -----------------------------------------------------------------
* | DEV_OPEN | device | proc nr | | | |
* |-------------+---------+---------+---------+---------+---------|
* | DEV_CLOSE | device | proc nr | | | |
* |-------------+---------+---------+---------+---------+---------|
* | DEV_READ_S | device | proc nr | bytes | | buf ptr |
* |-------------+---------+---------+---------+---------+---------|
* | DEV_WRITE_S | device | proc nr | bytes | | buf ptr |
* |-------------+---------+---------+---------+---------+---------|
* | DEV_IOCTL_S | device | proc nr |func code| | buf ptr |
* |-------------+---------+---------+---------+---------+---------|
* | HARD_INT | | | | | |
* -----------------------------------------------------------------
*
* The file contains one entry point:
*
* main: main entry when driver is brought up
*
* October 2007 Updated audio framework to work with mplayer, added
* savecopies (Pieter Hijma)
* February 2006 Updated audio framework,
* changed driver-framework relation (Peter Boonstoppel)
* November 2005 Created generic DMA driver framework (Laurens Bronwasser)
* August 24 2005 Ported audio driver to user space
* (only audio playback) (Peter Boonstoppel)
* May 20 1995 SB16 Driver: Michel R. Prevenier
*/
#include <minix/audio_fw.h>
#include <minix/endpoint.h>
#include <minix/ds.h>
static int msg_open(int minor_dev_nr);
static int msg_close(int minor_dev_nr);
static int msg_ioctl(const message *m_ptr);
static void msg_write(const message *m_ptr);
static void msg_read(message *m_ptr);
static void msg_hardware(void);
static void msg_status(message *m_ptr);
static int init_driver(void);
static int open_sub_dev(int sub_dev_nr, int operation);
static int close_sub_dev(int sub_dev_nr);
static void handle_int_write(int sub_dev_nr);
static void handle_int_read(int sub_dev_nr);
static void data_to_user(sub_dev_t *sub_dev_ptr);
static void data_from_user(sub_dev_t *sub_dev_ptr);
static int init_buffers(sub_dev_t *sub_dev_ptr);
static int get_started(sub_dev_t *sub_dev_ptr);
static void reply(int code, int replyee, int process,int status);
static int io_ctl_length(int io_request);
static special_file_t* get_special_file(int minor_dev_nr);
static void tell_dev(vir_bytes buf, size_t size, int pci_bus, int
pci_dev, int pci_func);
static char io_ctl_buf[_IOCPARM_MASK];
static int irq_hook_id = 0; /* id of irq hook at the kernel */
static int irq_hook_set = FALSE;
static int device_available = 0;/*todo*/
/* SEF functions and variables. */
static void sef_local_startup(void);
static int sef_cb_init_fresh(int type, sef_init_info_t *info);
static void sef_cb_signal_handler(int signo);
EXTERN int sef_cb_lu_prepare(int state);
EXTERN int sef_cb_lu_state_isvalid(int state);
EXTERN void sef_cb_lu_state_dump(int state);
int main(void)
{
int r, caller;
message mess, repl_mess;
int ipc_status;
/* SEF local startup. */
sef_local_startup();
/* Here is the main loop of the dma driver. It waits for a message,
carries it out, and sends a reply. */
while(1) {
if(driver_receive(ANY, &mess, &ipc_status) != OK) {
panic("driver_receive failed");
}
caller = mess.m_source;
/* Now carry out the work. First check for notifications. */
if (is_ipc_notify(ipc_status)) {
switch (_ENDPOINT_P(mess.m_source)) {
case HARDWARE:
msg_hardware();
break;
default:
printf("%s: %d uncaught notify!\n",
drv.DriverName, mess.m_type);
}
/* get next message */
continue;
}
/* Normal messages. */
switch(mess.m_type) {
case DEV_OPEN:
/* open the special file ( = parameter) */
r = msg_open(mess.DEVICE);
repl_mess.m_type = DEV_OPEN_REPL;
repl_mess.REP_ENDPT = mess.USER_ENDPT;
repl_mess.REP_IO_GRANT =
(cp_grant_id_t) mess.IO_GRANT;
repl_mess.REP_STATUS = r;
send(caller, &repl_mess);
continue;
case DEV_CLOSE:
/* close the special file ( = parameter) */
r = msg_close(mess.DEVICE);
repl_mess.m_type = DEV_CLOSE_REPL;
repl_mess.REP_ENDPT = mess.USER_ENDPT;
repl_mess.REP_IO_GRANT =
(cp_grant_id_t) mess.IO_GRANT;
repl_mess.REP_STATUS = r;
send(caller, &repl_mess);
continue;
case DEV_IOCTL_S:
r = msg_ioctl(&mess);
if (r != SUSPEND)
{
repl_mess.m_type = DEV_REVIVE;
repl_mess.REP_ENDPT = mess.USER_ENDPT;
repl_mess.REP_IO_GRANT =
(cp_grant_id_t) mess.IO_GRANT;
repl_mess.REP_STATUS = r;
send(caller, &repl_mess);
}
continue;
case DEV_READ_S:
msg_read(&mess); continue; /* don't reply */
case DEV_WRITE_S:
msg_write(&mess); continue; /* don't reply */
case DEV_REOPEN:
/* reopen the special file ( = parameter) */
r = msg_open(mess.DEVICE);
repl_mess.m_type = DEV_REOPEN_REPL;
repl_mess.REP_ENDPT = mess.USER_ENDPT;
repl_mess.REP_IO_GRANT =
(cp_grant_id_t) mess.IO_GRANT;
repl_mess.REP_STATUS = r;
send(caller, &repl_mess);
continue;
default:
printf("%s: %d uncaught msg!\n",
drv.DriverName, mess.m_type);
continue;
}
/* Should not be here. Just continue. */
}
return 1;
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
static void sef_local_startup()
{
/* Register init callbacks. */
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_lu(sef_cb_init_fresh);
sef_setcb_init_restart(sef_cb_init_fresh);
/* Register live update callbacks. */
sef_setcb_lu_prepare(sef_cb_lu_prepare);
sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid);
sef_setcb_lu_state_dump(sef_cb_lu_state_dump);
/* Register signal callbacks. */
sef_setcb_signal_handler(sef_cb_signal_handler);
/* Let SEF perform startup. */
sef_startup();
}
/*===========================================================================*
* sef_cb_init_fresh *
*===========================================================================*/
static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
{
/* Initialize the audio driver framework. */
return init_driver();
}
static int init_driver(void) {
u32_t i; char irq;
static int executed = 0;
sub_dev_t* sub_dev_ptr;
/* initialize basic driver variables */
if (drv_init() != OK) {
printf("libaudiodriver: Could not initialize driver\n");
return EIO;
}
/* init variables, get dma buffers */
for (i = 0; i < drv.NrOfSubDevices; i++) {
sub_dev_ptr = &sub_dev[i];
sub_dev_ptr->Opened = FALSE;
sub_dev_ptr->DmaBusy = FALSE;
sub_dev_ptr->DmaMode = NO_DMA;
sub_dev_ptr->DmaReadNext = 0;
sub_dev_ptr->DmaFillNext = 0;
sub_dev_ptr->DmaLength = 0;
sub_dev_ptr->BufReadNext = 0;
sub_dev_ptr->BufFillNext = 0;
sub_dev_ptr->RevivePending = FALSE;
sub_dev_ptr->OutOfData = FALSE;
sub_dev_ptr->Nr = i;
}
/* initialize hardware*/
if (drv_init_hw() != OK) {
printf("%s: Could not initialize hardware\n", drv.DriverName);
return EIO;
}
/* get irq from device driver...*/
if (drv_get_irq(&irq) != OK) {
printf("%s: init driver couldn't get IRQ", drv.DriverName);
return EIO;
}
/* TODO: execute the rest of this function only once
we don't want to set irq policy twice */
if (executed) return OK;
executed = TRUE;
/* ...and register interrupt vector */
if ((i=sys_irqsetpolicy(irq, 0, &irq_hook_id )) != OK){
printf("%s: init driver couldn't set IRQ policy: %d", drv.DriverName, i);
return EIO;
}
irq_hook_set = TRUE; /* now signal handler knows it must unregister policy*/
/* Announce we are up! */
chardriver_announce();
return OK;
}
/*===========================================================================*
* sef_cb_signal_handler *
*===========================================================================*/
static void sef_cb_signal_handler(int signo)
{
int i;
char irq;
/* Only check for termination signal, ignore anything else. */
if (signo != SIGTERM) return;
for (i = 0; i < drv.NrOfSubDevices; i++) {
drv_stop(i); /* stop all sub devices */
}
if (irq_hook_set) {
if (sys_irqdisable(&irq_hook_id) != OK) {
printf("Could not disable IRQ\n");
}
/* get irq from device driver*/
if (drv_get_irq(&irq) != OK) {
printf("Msg SIG_STOP Couldn't get IRQ");
}
/* remove the policy */
if (sys_irqrmpolicy(&irq_hook_id) != OK) {
printf("%s: Could not disable IRQ\n",drv.DriverName);
}
}
}
static int msg_open (int minor_dev_nr) {
int r, read_chan, write_chan, io_ctl;
special_file_t* special_file_ptr;
special_file_ptr = get_special_file(minor_dev_nr);
if(special_file_ptr == NULL) {
return EIO;
}
read_chan = special_file_ptr->read_chan;
write_chan = special_file_ptr->write_chan;
io_ctl = special_file_ptr->io_ctl;
if (read_chan==NO_CHANNEL && write_chan==NO_CHANNEL && io_ctl==NO_CHANNEL) {
printf("%s: No channel specified for minor device %d!\n",
drv.DriverName, minor_dev_nr);
return EIO;
}
if (read_chan == write_chan && read_chan != NO_CHANNEL) {
printf("%s: Read and write channels are equal: %d!\n",
drv.DriverName, minor_dev_nr);
return EIO;
}
/* init driver */
if (!device_available) {
if (init_driver() != OK) {
printf("%s: Couldn't init driver!\n", drv.DriverName);
return EIO;
} else {
device_available = TRUE;
}
}
/* open the sub devices specified in the interface header file */
if (write_chan != NO_CHANNEL) {
/* open sub device for writing */
if (open_sub_dev(write_chan, DEV_WRITE_S) != OK) return EIO;
}
if (read_chan != NO_CHANNEL) {
if (open_sub_dev(read_chan, DEV_READ_S) != OK) return EIO;
}
if (read_chan == io_ctl || write_chan == io_ctl) {
/* io_ctl is already opened because it's the same as read or write */
return OK; /* we're done */
}
if (io_ctl != NO_CHANNEL) { /* Ioctl differs from read/write channels, */
r = open_sub_dev(io_ctl, NO_DMA); /* open it explicitly */
if (r != OK) return EIO;
}
return OK;
}
static int open_sub_dev(int sub_dev_nr, int dma_mode) {
sub_dev_t* sub_dev_ptr;
sub_dev_ptr = &sub_dev[sub_dev_nr];
/* Only one open at a time per sub device */
if (sub_dev_ptr->Opened) {
printf("%s: Sub device %d is already opened\n",
drv.DriverName, sub_dev_nr);
return EBUSY;
}
if (sub_dev_ptr->DmaBusy) {
printf("%s: Sub device %d is still busy\n", drv.DriverName, sub_dev_nr);
return EBUSY;
}
/* Setup variables */
sub_dev_ptr->Opened = TRUE;
sub_dev_ptr->DmaReadNext = 0;
sub_dev_ptr->DmaFillNext = 0;
sub_dev_ptr->DmaLength = 0;
sub_dev_ptr->DmaMode = dma_mode;
sub_dev_ptr->BufReadNext = 0;
sub_dev_ptr->BufFillNext = 0;
sub_dev_ptr->BufLength = 0;
sub_dev_ptr->RevivePending = FALSE;
sub_dev_ptr->OutOfData = TRUE;
/* arrange DMA */
if (dma_mode != NO_DMA) { /* sub device uses DMA */
/* allocate dma buffer and extra buffer space
and configure sub device for dma */
if (init_buffers(sub_dev_ptr) != OK ) return EIO;
}
return OK;
}
static int msg_close(int minor_dev_nr) {
int r, read_chan, write_chan, io_ctl;
special_file_t* special_file_ptr;
special_file_ptr = get_special_file(minor_dev_nr);
if(special_file_ptr == NULL) {
return EIO;
}
read_chan = special_file_ptr->read_chan;
write_chan = special_file_ptr->write_chan;
io_ctl = special_file_ptr->io_ctl;
r= OK;
/* close all sub devices */
if (write_chan != NO_CHANNEL) {
if (close_sub_dev(write_chan) != OK) r = EIO;
}
if (read_chan != NO_CHANNEL) {
if (close_sub_dev(read_chan) != OK) r = EIO;
}
if (read_chan == io_ctl || write_chan == io_ctl) {
/* io_ctl is already closed because it's the same as read or write */
return r; /* we're done */
}
/* ioctl differs from read/write channels... */
if (io_ctl != NO_CHANNEL) {
if (close_sub_dev(io_ctl) != OK) r = EIO; /* ...close it explicitly */
}
return r;
}
static int close_sub_dev(int sub_dev_nr) {
size_t size;
sub_dev_t *sub_dev_ptr;
sub_dev_ptr = &sub_dev[sub_dev_nr];
if (sub_dev_ptr->DmaMode == DEV_WRITE_S && !sub_dev_ptr->OutOfData) {
/* do nothing, still data in buffers that has to be transferred */
sub_dev_ptr->Opened = FALSE; /* keep DMA busy */
return OK;
}
if (sub_dev_ptr->DmaMode == NO_DMA) {
/* do nothing, there is no dma going on */
sub_dev_ptr->Opened = FALSE;
return OK;
}
sub_dev_ptr->Opened = FALSE;
sub_dev_ptr->DmaBusy = FALSE;
/* stop the device */
drv_stop(sub_dev_ptr->Nr);
/* free the buffers */
size= sub_dev_ptr->DmaSize + 64 * 1024;
free_contig(sub_dev_ptr->DmaBuf, size);
free(sub_dev_ptr->ExtraBuf);
return OK;
}
static int msg_ioctl(const message *m_ptr)
{
int status, len, chan;
sub_dev_t *sub_dev_ptr;
special_file_t* special_file_ptr;
special_file_ptr = get_special_file(m_ptr->DEVICE);
if(special_file_ptr == NULL) {
return EIO;
}
chan = special_file_ptr->io_ctl;
if (chan == NO_CHANNEL) {
printf("%s: No io control channel specified!\n", drv.DriverName);
return EIO;
}
/* get pointer to sub device data */
sub_dev_ptr = &sub_dev[chan];
if(!sub_dev_ptr->Opened) {
printf("%s: io control impossible - not opened!\n", drv.DriverName);
return EIO;
}
/* this is a hack...todo: may we intercept reset calls? */
/*
if(m_ptr->REQUEST == DSPIORESET) {
device_available = FALSE;
}
*/
if (m_ptr->REQUEST & _IOC_IN) { /* if there is data for us, copy it */
len = io_ctl_length(m_ptr->REQUEST);
if(sys_safecopyfrom(m_ptr->m_source,
(vir_bytes)m_ptr->ADDRESS, 0,
(vir_bytes)io_ctl_buf, len) != OK) {
printf("%s:%d: safecopyfrom failed\n", __FILE__, __LINE__);
}
}
/* all ioctl's are passed to the device specific part of the driver */
status = drv_io_ctl(m_ptr->REQUEST, (void *)io_ctl_buf, &len, chan);
/* _IOC_OUT bit -> user expects data */
if (status == OK && m_ptr->REQUEST & _IOC_OUT) {
/* copy result back to user */
if(sys_safecopyto(m_ptr->m_source, (vir_bytes)m_ptr->ADDRESS, 0,
(vir_bytes)io_ctl_buf, len) != OK) {
printf("%s:%d: safecopyto failed\n", __FILE__, __LINE__);
}
}
return status;
}
static void msg_write(const message *m_ptr)
{
int chan; sub_dev_t *sub_dev_ptr;
special_file_t* special_file_ptr;
special_file_ptr = get_special_file(m_ptr->DEVICE);
chan = special_file_ptr->write_chan;
if (chan == NO_CHANNEL) {
printf("%s: No write channel specified!\n", drv.DriverName);
reply(DEV_REVIVE, m_ptr->m_source, m_ptr->USER_ENDPT, EIO);
return;
}
/* get pointer to sub device data */
sub_dev_ptr = &sub_dev[chan];
if (!sub_dev_ptr->DmaBusy) { /* get fragment size on first write */
if (drv_get_frag_size(&(sub_dev_ptr->FragSize), sub_dev_ptr->Nr) != OK){
printf("%s; Failed to get fragment size!\n", drv.DriverName);
return;
}
}
if(m_ptr->COUNT != sub_dev_ptr->FragSize) {
printf("Fragment size does not match user's buffer length\n");
reply(DEV_REVIVE, m_ptr->m_source, m_ptr->USER_ENDPT, EINVAL);
return;
}
/* if we are busy with something else than writing, return EBUSY */
if(sub_dev_ptr->DmaBusy && sub_dev_ptr->DmaMode != DEV_WRITE_S) {
printf("Already busy with something else then writing\n");
reply(DEV_REVIVE, m_ptr->m_source, m_ptr->USER_ENDPT, EBUSY);
return;
}
sub_dev_ptr->RevivePending = TRUE;
sub_dev_ptr->ReviveProcNr = m_ptr->USER_ENDPT;
sub_dev_ptr->ReviveGrant = (cp_grant_id_t) m_ptr->ADDRESS;
sub_dev_ptr->SourceProcNr = m_ptr->m_source;
data_from_user(sub_dev_ptr);
if(!sub_dev_ptr->DmaBusy) { /* Dma tranfer not yet started */
get_started(sub_dev_ptr);
sub_dev_ptr->DmaMode = DEV_WRITE_S; /* Dma mode is writing */
}
}
static void msg_read(message *m_ptr)
{
int chan; sub_dev_t *sub_dev_ptr;
special_file_t* special_file_ptr;
special_file_ptr = get_special_file(m_ptr->DEVICE);
chan = special_file_ptr->read_chan;
if (chan == NO_CHANNEL) {
printf("%s: No read channel specified!\n", drv.DriverName);
reply(DEV_REVIVE, m_ptr->m_source, m_ptr->USER_ENDPT, EIO);
return;
}
/* get pointer to sub device data */
sub_dev_ptr = &sub_dev[chan];
if (!sub_dev_ptr->DmaBusy) { /* get fragment size on first read */
if (drv_get_frag_size(&(sub_dev_ptr->FragSize), sub_dev_ptr->Nr) != OK){
printf("%s: Could not retrieve fragment size!\n", drv.DriverName);
reply(DEV_REVIVE, m_ptr->m_source, m_ptr->USER_ENDPT,
EIO);
return;
}
}
if(m_ptr->COUNT != sub_dev_ptr->FragSize) {
reply(DEV_REVIVE, m_ptr->m_source, m_ptr->USER_ENDPT, EINVAL);
printf("fragment size does not match message size\n");
return;
}
/* if we are busy with something else than reading, reply EBUSY */
if(sub_dev_ptr->DmaBusy && sub_dev_ptr->DmaMode != DEV_READ_S) {
reply(DEV_REVIVE, m_ptr->m_source, m_ptr->USER_ENDPT, EBUSY);
return;
}
sub_dev_ptr->RevivePending = TRUE;
sub_dev_ptr->ReviveProcNr = m_ptr->USER_ENDPT;
sub_dev_ptr->ReviveGrant = (cp_grant_id_t) m_ptr->ADDRESS;
sub_dev_ptr->SourceProcNr = m_ptr->m_source;
if(!sub_dev_ptr->DmaBusy) { /* Dma tranfer not yet started */
get_started(sub_dev_ptr);
sub_dev_ptr->DmaMode = DEV_READ_S; /* Dma mode is reading */
return; /* no need to get data from DMA buffer at this point */
}
/* check if data is available and possibly fill user's buffer */
data_to_user(sub_dev_ptr);
}
static void msg_hardware(void) {
u32_t i;
/* loop over all sub devices */
for ( i = 0; i < drv.NrOfSubDevices; i++) {
/* if interrupt from sub device and Dma transfer
was actually busy, take care of business */
if( drv_int(i) && sub_dev[i].DmaBusy ) {
if (sub_dev[i].DmaMode == DEV_WRITE_S) handle_int_write(i);
if (sub_dev[i].DmaMode == DEV_READ_S) handle_int_read(i);
}
}
/* As IRQ_REENABLE is not on in sys_irqsetpolicy, we must
* re-enable out interrupt after every interrupt.
*/
if ((sys_irqenable(&irq_hook_id)) != OK) {
printf("%s: msg_hardware: Couldn't enable IRQ\n", drv.DriverName);
}
}
/* handle interrupt for specified sub device; DmaMode == DEV_WRITE_S*/
static void handle_int_write(int sub_dev_nr)
{
sub_dev_t *sub_dev_ptr;
sub_dev_ptr = &sub_dev[sub_dev_nr];
sub_dev_ptr->DmaReadNext =
(sub_dev_ptr->DmaReadNext + 1) % sub_dev_ptr->NrOfDmaFragments;
sub_dev_ptr->DmaLength -= 1;
if (sub_dev_ptr->BufLength != 0) { /* Data in extra buf, copy to Dma buf */
memcpy(sub_dev_ptr->DmaPtr +
sub_dev_ptr->DmaFillNext * sub_dev_ptr->FragSize,
sub_dev_ptr->ExtraBuf +
sub_dev_ptr->BufReadNext * sub_dev_ptr->FragSize,
sub_dev_ptr->FragSize);
sub_dev_ptr->BufReadNext =
(sub_dev_ptr->BufReadNext + 1) % sub_dev_ptr->NrOfExtraBuffers;
sub_dev_ptr->DmaFillNext =
(sub_dev_ptr->DmaFillNext + 1) % sub_dev_ptr->NrOfDmaFragments;
sub_dev_ptr->BufLength -= 1;
sub_dev_ptr->DmaLength += 1;
}
/* space became available, possibly copy new data from user */
data_from_user(sub_dev_ptr);
if(sub_dev_ptr->DmaLength == 0) { /* Dma buffer empty, stop Dma transfer */
sub_dev_ptr->OutOfData = TRUE; /* we're out of data */
if (!sub_dev_ptr->Opened) {
close_sub_dev(sub_dev_ptr->Nr);
return;
}
drv_pause(sub_dev_ptr->Nr);
return;
}
/* confirm and reenable interrupt from this sub dev */
drv_reenable_int(sub_dev_nr);
#if 0
/* reenable irq_hook*/
if (sys_irqenable(&irq_hook_id != OK) {
printf("%s Couldn't enable IRQ\n", drv.DriverName);
}
#endif
}
/* handle interrupt for specified sub device; DmaMode == DEV_READ_S */
static void handle_int_read(int sub_dev_nr)
{
sub_dev_t *sub_dev_ptr;
message m;
sub_dev_ptr = &sub_dev[sub_dev_nr];
sub_dev_ptr->DmaLength += 1;
sub_dev_ptr->DmaFillNext =
(sub_dev_ptr->DmaFillNext + 1) % sub_dev_ptr->NrOfDmaFragments;
/* possibly copy data to user (if it is waiting for us) */
data_to_user(sub_dev_ptr);
if (sub_dev_ptr->DmaLength == sub_dev_ptr->NrOfDmaFragments) {
/* if dma buffer full */
if (sub_dev_ptr->BufLength == sub_dev_ptr->NrOfExtraBuffers) {
printf("All buffers full, we have a problem.\n");
drv_stop(sub_dev_nr); /* stop the sub device */
sub_dev_ptr->DmaBusy = FALSE;
sub_dev_ptr->ReviveStatus = 0; /* no data for user,
* this is a sad story
*/
m.m_type = DEV_REVIVE;
m.REP_ENDPT = sub_dev_ptr->ReviveProcNr;
m.REP_IO_GRANT = sub_dev_ptr->ReviveGrant;
m.REP_STATUS = sub_dev_ptr->ReviveStatus;
send(sub_dev_ptr->SourceProcNr, &m);
return;
}
else { /* dma full, still room in extra buf;
copy from dma to extra buf */
memcpy(sub_dev_ptr->ExtraBuf +
sub_dev_ptr->BufFillNext * sub_dev_ptr->FragSize,
sub_dev_ptr->DmaPtr +
sub_dev_ptr->DmaReadNext * sub_dev_ptr->FragSize,
sub_dev_ptr->FragSize);
sub_dev_ptr->DmaLength -= 1;
sub_dev_ptr->DmaReadNext =
(sub_dev_ptr->DmaReadNext + 1) % sub_dev_ptr->NrOfDmaFragments;
sub_dev_ptr->BufFillNext =
(sub_dev_ptr->BufFillNext + 1) % sub_dev_ptr->NrOfExtraBuffers;
}
}
/* confirm interrupt, and reenable interrupt from this sub dev*/
drv_reenable_int(sub_dev_ptr->Nr);
#if 0
/* reenable irq_hook*/
if (sys_irqenable(&irq_hook_id) != OK) {
printf("%s: Couldn't reenable IRQ", drv.DriverName);
}
#endif
}
static int get_started(sub_dev_t *sub_dev_ptr) {
u32_t i;
/* enable interrupt messages from MINIX */
if ((i=sys_irqenable(&irq_hook_id)) != OK) {
printf("%s: Couldn't enable IRQs: error code %u",drv.DriverName, (unsigned int) i);
return EIO;
}
/* let the lower part of the driver start the device */
if (drv_start(sub_dev_ptr->Nr, sub_dev_ptr->DmaMode) != OK) {
printf("%s: Could not start device %d\n",
drv.DriverName, sub_dev_ptr->Nr);
}
sub_dev_ptr->DmaBusy = TRUE; /* Dma is busy from now on */
sub_dev_ptr->DmaReadNext = 0;
return OK;
}
static void data_from_user(sub_dev_t *subdev)
{
int r;
message m;
if (subdev->DmaLength == subdev->NrOfDmaFragments &&
subdev->BufLength == subdev->NrOfExtraBuffers) return;/* no space */
if (!subdev->RevivePending) return; /* no new data waiting to be copied */
if (subdev->DmaLength < subdev->NrOfDmaFragments) { /* room in dma buf */
r = sys_safecopyfrom(subdev->SourceProcNr,
(vir_bytes)subdev->ReviveGrant, 0,
(vir_bytes)subdev->DmaPtr +
subdev->DmaFillNext * subdev->FragSize,
(phys_bytes)subdev->FragSize);
if (r != OK)
printf("%s:%d: safecopy failed\n", __FILE__, __LINE__);
subdev->DmaLength += 1;
subdev->DmaFillNext =
(subdev->DmaFillNext + 1) % subdev->NrOfDmaFragments;
} else { /* room in extra buf */
r = sys_safecopyfrom(subdev->SourceProcNr,
(vir_bytes)subdev->ReviveGrant, 0,
(vir_bytes)subdev->ExtraBuf +
subdev->BufFillNext * subdev->FragSize,
(phys_bytes)subdev->FragSize);
if (r != OK)
printf("%s:%d: safecopy failed\n", __FILE__, __LINE__);
subdev->BufLength += 1;
subdev->BufFillNext =
(subdev->BufFillNext + 1) % subdev->NrOfExtraBuffers;
}
if(subdev->OutOfData) { /* if device paused (because of lack of data) */
subdev->OutOfData = FALSE;
drv_reenable_int(subdev->Nr);
/* reenable irq_hook*/
if ((sys_irqenable(&irq_hook_id)) != OK) {
printf("%s: Couldn't enable IRQ", drv.DriverName);
}
drv_resume(subdev->Nr); /* resume resume the sub device */
}
subdev->ReviveStatus = subdev->FragSize;
m.m_type = DEV_REVIVE; /* build message */
m.REP_ENDPT = subdev->ReviveProcNr;
m.REP_IO_GRANT = subdev->ReviveGrant;
m.REP_STATUS = subdev->ReviveStatus;
r= send(subdev->SourceProcNr, &m); /* send the message */
if (r != OK)
{
printf("audio_fw: send to %d failed: %d\n",
subdev->SourceProcNr, r);
}
/* reset variables */
subdev->RevivePending = 0;
}
static void data_to_user(sub_dev_t *sub_dev_ptr)
{
int r;
message m;
if (!sub_dev_ptr->RevivePending) return; /* nobody is wating for data */
if (sub_dev_ptr->BufLength == 0 && sub_dev_ptr->DmaLength == 0) return;
/* no data for user */
if(sub_dev_ptr->BufLength != 0) { /* data in extra buffer available */
r = sys_safecopyto(sub_dev_ptr->SourceProcNr,
(vir_bytes)sub_dev_ptr->ReviveGrant,
0, (vir_bytes)sub_dev_ptr->ExtraBuf +
sub_dev_ptr->BufReadNext * sub_dev_ptr->FragSize,
(phys_bytes)sub_dev_ptr->FragSize);
if (r != OK)
printf("%s:%d: safecopy failed\n", __FILE__, __LINE__);
/* adjust the buffer status variables */
sub_dev_ptr->BufReadNext =
(sub_dev_ptr->BufReadNext + 1) % sub_dev_ptr->NrOfExtraBuffers;
sub_dev_ptr->BufLength -= 1;
} else { /* extra buf empty, but data in dma buf*/
r = sys_safecopyto(
sub_dev_ptr->SourceProcNr,
(vir_bytes)sub_dev_ptr->ReviveGrant, 0,
(vir_bytes)sub_dev_ptr->DmaPtr +
sub_dev_ptr->DmaReadNext * sub_dev_ptr->FragSize,
(phys_bytes)sub_dev_ptr->FragSize);
if (r != OK)
printf("%s:%d: safecopy failed\n", __FILE__, __LINE__);
/* adjust the buffer status variables */
sub_dev_ptr->DmaReadNext =
(sub_dev_ptr->DmaReadNext + 1) % sub_dev_ptr->NrOfDmaFragments;
sub_dev_ptr->DmaLength -= 1;
}
sub_dev_ptr->ReviveStatus = sub_dev_ptr->FragSize;
/* drv_status will send REVIVE mess to FS*/
m.m_type = DEV_REVIVE; /* build message */
m.REP_ENDPT = sub_dev_ptr->ReviveProcNr;
m.REP_IO_GRANT = sub_dev_ptr->ReviveGrant;
m.REP_STATUS = sub_dev_ptr->ReviveStatus;
r= send(sub_dev_ptr->SourceProcNr, &m); /* send the message */
if (r != OK)
{
printf("audio_fw: send to %d failed: %d\n",
sub_dev_ptr->SourceProcNr, r);
}
/* reset variables */
sub_dev_ptr->RevivePending = 0;
}
static int init_buffers(sub_dev_t *sub_dev_ptr)
{
#if defined(__i386__)
char *base;
size_t size;
unsigned left;
u32_t i;
phys_bytes ph;
/* allocate dma buffer space */
size= sub_dev_ptr->DmaSize + 64 * 1024;
base= alloc_contig(size, AC_ALIGN64K|AC_LOWER16M, &ph);
if (!base) {
printf("%s: failed to allocate dma buffer for a channel\n",
drv.DriverName);
return EIO;
}
sub_dev_ptr->DmaBuf= base;
tell_dev((vir_bytes)base, size, 0, 0, 0);
/* allocate extra buffer space */
if (!(sub_dev_ptr->ExtraBuf = malloc(sub_dev_ptr->NrOfExtraBuffers *
sub_dev_ptr->DmaSize /
sub_dev_ptr->NrOfDmaFragments))) {
printf("%s failed to allocate extra buffer for a channel\n",
drv.DriverName);
return EIO;
}
sub_dev_ptr->DmaPtr = sub_dev_ptr->DmaBuf;
i = sys_umap(SELF, VM_D, (vir_bytes) base, (phys_bytes) size,
&(sub_dev_ptr->DmaPhys));
if (i != OK) {
return EIO;
}
if ((left = dma_bytes_left(sub_dev_ptr->DmaPhys)) <
sub_dev_ptr->DmaSize) {
/* First half of buffer crosses a 64K boundary,
* can't DMA into that */
sub_dev_ptr->DmaPtr += left;
sub_dev_ptr->DmaPhys += left;
}
/* write the physical dma address and size to the device */
drv_set_dma(sub_dev_ptr->DmaPhys,
sub_dev_ptr->DmaSize, sub_dev_ptr->Nr);
return OK;
#else /* !defined(__i386__) */
printf("%s: init_buffers() failed, CHIP != INTEL", drv.DriverName);
return EIO;
#endif /* defined(__i386__) */
}
static void reply(int code, int replyee, int process, int status) {
message m;
m.m_type = code; /* DEV_REVIVE */
m.REP_STATUS = status; /* result of device operation */
m.REP_ENDPT = process; /* which user made the request */
send(replyee, &m);
}
static int io_ctl_length(int io_request) {
io_request >>= 16;
return io_request & _IOCPARM_MASK;
}
static special_file_t* get_special_file(int minor_dev_nr) {
int i;
for(i = 0; i < drv.NrOfSpecialFiles; i++) {
if(special_file[i].minor_dev_nr == minor_dev_nr) {
return &special_file[i];
}
}
printf("%s: No subdevice specified for minor device %d!\n",
drv.DriverName, minor_dev_nr);
return NULL;
}
static void tell_dev(buf, size, pci_bus, pci_dev, pci_func)
vir_bytes buf;
size_t size;
int pci_bus;
int pci_dev;
int pci_func;
{
int r;
endpoint_t dev_e;
message m;
r= ds_retrieve_label_endpt("amddev", &dev_e);
if (r != OK)
{
#if 0
printf("tell_dev: ds_retrieve_label_endpt failed for 'amddev': %d\n",
r);
#endif
return;
}
m.m_type= IOMMU_MAP;
m.m2_i1= pci_bus;
m.m2_i2= pci_dev;
m.m2_i3= pci_func;
m.m2_l1= buf;
m.m2_l2= size;
r= sendrec(dev_e, &m);
if (r != OK)
{
printf("tell_dev: sendrec to %d failed: %d\n", dev_e, r);
return;
}
if (m.m_type != OK)
{
printf("tell_dev: dma map request failed: %d\n", m.m_type);
return;
}
}
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