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- Flesh out the support for the EBus variant which actually is the

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RTC function of a National Semiconductor PC87317/PC97317. This
  consists of using the century register the same way Solaris does
  for compatibility reasons. Once there is a MD power(4) we'd also
  want to interface the APC (Advanced Power Control) functionality
  of the same chip function with it.
- Use a macro for the device description and take advantage of
  ISA_PNP_PROBE() setting the device description.
- Use the generated typedefs for the prototypes of the device
  interface functions.
This commit is contained in:
Marius Strobl 2007-06-16 23:17:23 +00:00
parent 40fa5858b1
commit fdfba0e5ff
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=170845
1 changed files with 75 additions and 21 deletions
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96
sys/sparc64/sparc64/rtc.c
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@ -28,9 +28,10 @@
__FBSDID("$FreeBSD$");
/*
* The `rtc' device is a MC146818 compatible clock found on the ISA bus
* and EBus. The EBus version also has an interrupt property so it could
* be used to drive the statclock etc.
* The `rtc' device is a MC146818 compatible clock found on the ISA
* bus and EBus. The EBus variant actually is the Real-Time Clock
* function of a National Semiconductor PC87317/PC97317 which also
* provides Advanced Power Control functionality.
*/
#include "opt_isa.h"
@ -53,16 +54,30 @@ __FBSDID("$FreeBSD$");
#include <isa/isavar.h>
#include <dev/mc146818/mc146818reg.h>
#include <dev/mc146818/mc146818var.h>
#include "clock_if.h"
#define RTC_DESC "Real-Time Clock"
#define RTC_READ mc146818_def_read
#define RTC_WRITE mc146818_def_write
#define PC87317_COMMON MC_REGA_DV0 /* bank 0 */
#define PC87317_RTC (MC_REGA_DV1 | MC_REGA_DV0) /* bank 1 */
#define PC87317_RTC_CR 0x48 /* Century Register */
#define PC87317_APC MC_REGA_DV2 /* bank 2 */
#define PC87317_APC_CADDR 0x51 /* Century Address Register */
#define PC87317_APC_CADDR_BANK0 0x00 /* locate CR in bank 0 */
#define PC87317_APC_CADDR_BANK1 0x80 /* locate CR in bank 1 */
static devclass_t rtc_devclass;
static int rtc_attach(device_t dev);
static int rtc_ebus_probe(device_t dev);
static device_attach_t rtc_attach;
static device_probe_t rtc_ebus_probe;
#ifdef DEV_ISA
static int rtc_isa_probe(device_t dev);
static device_probe_t rtc_isa_probe;
#endif
static device_method_t rtc_ebus_methods[] = {
@ -107,12 +122,15 @@ static driver_t rtc_isa_driver = {
DRIVER_MODULE(rtc, isa, rtc_isa_driver, rtc_devclass, 0, 0);
#endif
static u_int pc87317_getcent(device_t);
static void pc87317_setcent(device_t, u_int);
static int
rtc_ebus_probe(device_t dev)
{
if (strcmp(ofw_bus_get_name(dev), "rtc") == 0) {
device_set_desc(dev, "Real Time Clock");
device_set_desc(dev, RTC_DESC);
return (0);
}
@ -121,7 +139,7 @@ rtc_ebus_probe(device_t dev)
#ifdef DEV_ISA
static struct isa_pnp_id rtc_isa_ids[] = {
{ 0x000bd041, "AT realtime clock" }, /* PNP0B00 */
{ 0x000bd041, RTC_DESC }, /* PNP0B00 */
{ 0 }
};
@ -129,10 +147,8 @@ static int
rtc_isa_probe(device_t dev)
{
if (ISA_PNP_PROBE(device_get_parent(dev), dev, rtc_isa_ids) == 0) {
device_set_desc(dev, "Real Time Clock");
if (ISA_PNP_PROBE(device_get_parent(dev), dev, rtc_isa_ids) == 0)
return (0);
}
return (ENXIO);
}
@ -144,19 +160,19 @@ rtc_attach(device_t dev)
struct timespec ts;
struct mc146818_softc *sc;
struct resource *res;
int error, rid, rtype;
int ebus, error, rid;
sc = device_get_softc(dev);
mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN);
if (strcmp(device_get_name(device_get_parent(dev)), "isa") == 0)
rtype = SYS_RES_IOPORT;
else
rtype = SYS_RES_MEMORY;
ebus = 0;
if (strcmp(device_get_name(device_get_parent(dev)), "ebus") == 0)
ebus = 1;
rid = 0;
res = bus_alloc_resource_any(dev, rtype, &rid, RF_ACTIVE);
res = bus_alloc_resource_any(dev, ebus ? SYS_RES_MEMORY :
SYS_RES_IOPORT, &rid, RF_ACTIVE);
if (res == NULL) {
device_printf(dev, "cannot allocate resources\n");
error = ENXIO;
@ -165,10 +181,27 @@ rtc_attach(device_t dev)
sc->sc_bst = rman_get_bustag(res);
sc->sc_bsh = rman_get_bushandle(res);
sc->sc_mcread = RTC_READ;
sc->sc_mcwrite = RTC_WRITE;
/* The TOD clock year 0 is 0. */
sc->sc_year0 = 0;
/* Use default register read/write and century get/set functions. */
/*
* For ISA use the default century get/set functions, for EBus we
* provide our own versions.
*/
sc->sc_flag = MC146818_NO_CENT_ADJUST;
if (ebus) {
/*
* Make sure the CR is at the default location (also used
* by Solaris).
*/
RTC_WRITE(dev, MC_REGA, PC87317_APC);
RTC_WRITE(dev, PC87317_APC_CADDR, PC87317_APC_CADDR_BANK1 |
PC87317_RTC_CR);
RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
sc->sc_getcent = pc87317_getcent;
sc->sc_setcent = pc87317_setcent;
}
if ((error = mc146818_attach(dev)) != 0) {
device_printf(dev, "cannot attach time of day clock\n");
goto fail_res;
@ -178,14 +211,35 @@ rtc_attach(device_t dev)
mc146818_gettime(dev, &ts);
device_printf(dev, "current time: %ld.%09ld\n", (long)ts.tv_sec,
ts.tv_nsec);
}
}
return (0);
fail_res:
bus_release_resource(dev, rtype, rid, res);
bus_release_resource(dev, ebus ? SYS_RES_MEMORY : SYS_RES_IOPORT, rid,
res);
fail_mtx:
mtx_destroy(&sc->sc_mtx);
return (error);
}
static u_int
pc87317_getcent(device_t dev)
{
u_int cent;
RTC_WRITE(dev, MC_REGA, PC87317_RTC);
cent = RTC_READ(dev, PC87317_RTC_CR);
RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
return (cent);
}
static void
pc87317_setcent(device_t dev, u_int cent)
{
RTC_WRITE(dev, MC_REGA, PC87317_RTC);
RTC_WRITE(dev, PC87317_RTC_CR, cent);
RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
}