int
sbscn_speed(long speed, long *brcp)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
int frequency = 100000000;
*brcp = divrnd(frequency / 20, speed) - 1;
if (speed <= 0)
return (-1);
x = divrnd(frequency / 20, speed);
if (x <= 0)
return (-1);
err = divrnd(((quad_t)frequency) * 1000 / 20, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > SBSCN_TOLERANCE)
return (-1);
*brcp = x - 1;
return (0);
#undef divrnd
}
static int
comspeed(int speed)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
if (speed <= 0)
return (-1);
x = divrnd((NS16550_FREQ / 16), speed);
if (x <= 0)
return (-1);
err = divrnd((((quad_t)NS16550_FREQ) / 16) * 1000, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > COM_TOLERANCE)
return (-1);
return (x);
#undef divrnd
}
int
sscomspeed(long speed, long frequency)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
if (speed <= 0)
return -1;
x = divrnd(frequency / 16, speed);
if (x <= 0)
return -1;
err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > SSCOM_TOLERANCE)
return -1;
return x-1;
#undef divrnd
}
static int
sscomspeed(long speed)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
long pclk = get_com_freq();
if (speed <= 0)
return -1;
x = divrnd(pclk / 16, speed);
if (x <= 0)
return -1;
err = divrnd(((quad_t)pclk) * 1000 / 16, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > SSCOM_TOLERANCE)
return -1;
return x-1;
#undef divrnd
}
int
comspeed(long freq, long speed)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
if (speed == 0)
return 0;
if (speed < 0)
return -1;
x = divrnd((freq / 16), speed);
if (x <= 0)
return -1;
err = divrnd((quad_t)freq * 1000 / 16, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > COM_TOLERANCE)
return -1;
return x;
#undef divrnd
}
static int
comspeed(long speed)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
if (speed == 0)
return 0;
if (speed < 0)
return -1;
x = divrnd((COM_FREQ / 16), speed);
if (x <= 0)
return -1;
err = divrnd((COM_FREQ / 16) * 1000, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > COM_TOLERANCE)
return -1;
return x;
#undef divrnd
}
void
ofppc_init_comcons(int isa_node)
{
#if (NCOM > 0)
char name[64];
uint32_t reg[2], comfreq;
uint8_t dll, dlm;
int speed, rate, err, com_node, child;
bus_space_handle_t comh;
/* if we have a serial cons, we have work to do */
memset(name, 0, sizeof(name));
OF_getprop(console_node, "device_type", name, sizeof(name));
if (strcmp(name, "serial") != 0)
return;
/* scan ISA children for serial devices to match our console */
com_node = -1;
for (child = OF_child(isa_node); child; child = OF_peer(child)) {
memset(name, 0, sizeof(name));
OF_getprop(child, "device_type", name, sizeof(name));
if (strcmp(name, "serial") == 0) {
/*
* Serial device even matches our console_node?
* Then we're done!
*/
if (child == console_node) {
com_node = child;
break;
}
/* remember first serial device found */
if (com_node == -1)
com_node = child;
}
}
if (com_node == -1)
return;
if (OF_getprop(com_node, "reg", reg, sizeof(reg)) == -1)
return;
if (OF_getprop(com_node, "clock-frequency", &comfreq, 4) == -1)
comfreq = 0;
if (comfreq == 0)
comfreq = COM_FREQ;
/* we need to BSM this, and then undo that before calling
* comcnattach.
*/
if (bus_space_map(&genppc_isa_io_space_tag, reg[1], 8, 0, &comh) != 0)
panic("Can't map isa serial\n");
bus_space_write_1(&genppc_isa_io_space_tag, comh, com_cfcr, LCR_DLAB);
dll = bus_space_read_1(&genppc_isa_io_space_tag, comh, com_dlbl);
dlm = bus_space_read_1(&genppc_isa_io_space_tag, comh, com_dlbh);
rate = dll | (dlm << 8);
bus_space_write_1(&genppc_isa_io_space_tag, comh, com_cfcr, LCR_8BITS);
speed = divrnd((comfreq / 16), rate);
err = speed - (speed + 150)/300 * 300;
speed -= err;
if (err < 0)
err = -err;
if (err > 50)
speed = 9600;
bus_space_unmap(&genppc_isa_io_space_tag, comh, 8);
/* Now we can attach the comcons */
aprint_verbose("Switching to COM console at speed %d", speed);
if (comcnattach(&genppc_isa_io_space_tag, reg[1],
speed, comfreq, COM_TYPE_NORMAL,
((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8)))
panic("Can't init serial console");
aprint_verbose("\n");
#endif /*NCOM*/
}