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Differential D25118 Diff 73079 sys/arm/ti/am335x/am335x_pwmss.c

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sys/arm/ti/am335x/am335x_pwmss.c

Show All 40 Lines
#include <machine/bus.h> #include <machine/bus.h>
#include <dev/fdt/simplebus.h> #include <dev/fdt/simplebus.h>
#include <dev/ofw/openfirm.h> #include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h> #include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h> #include <dev/ofw/ofw_bus_subr.h>
#include <arm/ti/ti_prcm.h> #include <arm/ti/ti_sysc.h>
#include <arm/ti/ti_hwmods.h>
#include <arm/ti/ti_scm.h>
#include <dev/extres/syscon/syscon.h>
#include "syscon_if.h"
#include "am335x_pwm.h" #include "am335x_pwm.h"
#include "am335x_scm.h" #include "am335x_scm.h"
#define PWMSS_IDVER 0x00 #define PWMSS_IDVER 0x00
#define PWMSS_SYSCONFIG 0x04 #define PWMSS_SYSCONFIG 0x04
#define PWMSS_CLKCONFIG 0x08 #define PWMSS_CLKCONFIG 0x08
#define CLKCONFIG_EPWMCLK_EN (1 << 8) #define CLKCONFIG_EPWMCLK_EN (1 << 8)
#define PWMSS_CLKSTATUS 0x0C #define PWMSS_CLKSTATUS 0x0C
/* TRM chapter 2 memory map table 2-3 + VER register location */
#define PWMSS_REV_0 0x0000
#define PWMSS_REV_1 0x2000
#define PWMSS_REV_2 0x4000
static device_probe_t am335x_pwmss_probe; static device_probe_t am335x_pwmss_probe;
static device_attach_t am335x_pwmss_attach; static device_attach_t am335x_pwmss_attach;
static device_detach_t am335x_pwmss_detach; static device_detach_t am335x_pwmss_detach;
struct am335x_pwmss_softc { struct am335x_pwmss_softc {
struct simplebus_softc sc_simplebus; struct simplebus_softc sc_simplebus;
device_t sc_dev; device_t sc_dev;
clk_ident_t sc_clk; struct syscon *syscon;
}; };
static device_method_t am335x_pwmss_methods[] = { static device_method_t am335x_pwmss_methods[] = {
DEVMETHOD(device_probe, am335x_pwmss_probe), DEVMETHOD(device_probe, am335x_pwmss_probe),
DEVMETHOD(device_attach, am335x_pwmss_attach), DEVMETHOD(device_attach, am335x_pwmss_attach),
DEVMETHOD(device_detach, am335x_pwmss_detach), DEVMETHOD(device_detach, am335x_pwmss_detach),
DEVMETHOD_END DEVMETHOD_END
Show All 14 Linesam335x_pwmss_probe(device_t dev)
return (BUS_PROBE_DEFAULT); return (BUS_PROBE_DEFAULT);
} }
static int static int
am335x_pwmss_attach(device_t dev) am335x_pwmss_attach(device_t dev)
{ {
struct am335x_pwmss_softc *sc; struct am335x_pwmss_softc *sc;
uint32_t reg, id; uint32_t reg, id;
phandle_t node; uint64_t rev_address;
phandle_t node, opp_table;
sc = device_get_softc(dev); sc = device_get_softc(dev);
sc->sc_dev = dev; sc->sc_dev = dev;
sc->sc_clk = ti_hwmods_get_clock(dev); /* FIXME: For now; Go and kidnap syscon from opp-table */
if (sc->sc_clk == INVALID_CLK_IDENT) { opp_table = OF_finddevice("/opp-table");
device_printf(dev, "failed to get device id based on ti,hwmods\n"); if (opp_table == -1) {
return (EINVAL); device_printf(dev, "Cant find /opp-table\n");
return (ENXIO);
} }
if (!OF_hasprop(opp_table, "syscon")) {
device_printf(dev, "/opp-table doesnt have required syscon property\n");
return (ENXIO);
}
if (syscon_get_by_ofw_property(dev, opp_table, "syscon", &sc->syscon) != 0) {
device_printf(dev, "Failed to get syscon\n");
return (ENXIO);
}
ti_prcm_clk_enable(sc->sc_clk); ti_sysc_clock_enable(device_get_parent(dev));
ti_scm_reg_read_4(SCM_PWMSS_CTRL, &reg);
switch (sc->sc_clk) { rev_address = ti_sysc_get_rev_address(device_get_parent(dev));
case PWMSS0_CLK: switch (rev_address) {
case PWMSS_REV_0:
id = 0; id = 0;
break; break;
case PWMSS1_CLK: case PWMSS_REV_1:
id = 1; id = 1;
break; break;
case PWMSS_REV_2:
case PWMSS2_CLK:
id = 2; id = 2;
break; break;
default:
device_printf(dev, "unknown pwmss clock id: %d\n", sc->sc_clk);
return (EINVAL);
} }
reg = SYSCON_READ_4(sc->syscon, SCM_PWMSS_CTRL);
reg |= (1 << id); reg |= (1 << id);
ti_scm_reg_write_4(SCM_PWMSS_CTRL, reg); SYSCON_WRITE_4(sc->syscon, SCM_PWMSS_CTRL, reg);
node = ofw_bus_get_node(dev); node = ofw_bus_get_node(dev);
if (node == -1) if (node == -1)
return (ENXIO); return (ENXIO);
simplebus_init(dev, node); simplebus_init(dev, node);
Show All 18 Linesam335x_pwmss_detach(device_t dev)
return (0); return (0);
} }
DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods, DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods,
sizeof(struct am335x_pwmss_softc), simplebus_driver); sizeof(struct am335x_pwmss_softc), simplebus_driver);
static devclass_t am335x_pwmss_devclass; static devclass_t am335x_pwmss_devclass;
DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, am335x_pwmss_devclass, 0, 0); DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, am335x_pwmss_devclass, 0, 0);
MODULE_VERSION(am335x_pwmss, 1); MODULE_VERSION(am335x_pwmss, 1);
MODULE_DEPEND(am335x_pwmss, ti_sysc, 1, 1, 1);