diff options
Diffstat (limited to 'sys/dev/extres/clk/clk_fixed.c')
| -rw-r--r-- | sys/dev/extres/clk/clk_fixed.c | 194 |
1 files changed, 181 insertions, 13 deletions
diff --git a/sys/dev/extres/clk/clk_fixed.c b/sys/dev/extres/clk/clk_fixed.c index 4ddceae..02721ae 100644 --- a/sys/dev/extres/clk/clk_fixed.c +++ b/sys/dev/extres/clk/clk_fixed.c @@ -27,7 +27,6 @@ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); - #include <sys/param.h> #include <sys/conf.h> #include <sys/bus.h> @@ -35,20 +34,25 @@ __FBSDID("$FreeBSD$"); #include <sys/kobj.h> #include <sys/malloc.h> #include <sys/mutex.h> +#include <sys/module.h> #include <sys/rman.h> #include <sys/systm.h> #include <machine/bus.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> #include <dev/extres/clk/clk_fixed.h> -#define DEVICE_LOCK(_sc) mtx_lock((_sc)->mtx) -#define DEVICE_UNLOCK(_sc) mtx_unlock((_sc)->mtx) +#define CLK_TYPE_FIXED 1 +#define CLK_TYPE_FIXED_FACTOR 2 static int clknode_fixed_init(struct clknode *clk, device_t dev); static int clknode_fixed_recalc(struct clknode *clk, uint64_t *freq); +static int clknode_fixed_set_freq(struct clknode *clk, uint64_t fin, + uint64_t *fout, int flags, int *stop); + struct clknode_fixed_sc { - struct mtx *mtx; int fixed_flags; uint64_t freq; uint32_t mult; @@ -59,6 +63,7 @@ static clknode_method_t clknode_fixed_methods[] = { /* Device interface */ CLKNODEMETHOD(clknode_init, clknode_fixed_init), CLKNODEMETHOD(clknode_recalc_freq, clknode_fixed_recalc), + CLKNODEMETHOD(clknode_set_freq, clknode_fixed_set_freq), CLKNODEMETHOD_END }; DEFINE_CLASS_1(clknode_fixed, clknode_fixed_class, clknode_fixed_methods, @@ -74,36 +79,52 @@ clknode_fixed_init(struct clknode *clk, device_t dev) clknode_init_parent_idx(clk, 0); return(0); } + static int clknode_fixed_recalc(struct clknode *clk, uint64_t *freq) { struct clknode_fixed_sc *sc; sc = clknode_get_softc(clk); - if (sc->freq != 0) - *freq = sc->freq; - else if ((sc->mult != 0) && (sc->div != 0)) + + if ((sc->mult != 0) && (sc->div != 0)) *freq = (*freq / sc->div) * sc->mult; else - *freq = 0; + *freq = sc->freq; + return (0); +} + +static int +clknode_fixed_set_freq(struct clknode *clk, uint64_t fin, uint64_t *fout, + int flags, int *stop) +{ + struct clknode_fixed_sc *sc; + + sc = clknode_get_softc(clk); + if (sc->mult == 0 || sc->div == 0) { + /* Fixed frequency clock. */ + *stop = 1; + if (*fout != sc->freq) + return (ERANGE); + return (0); + } + /* Fixed factor clock. */ + *stop = 0; + *fout = (*fout / sc->mult) * sc->div; return (0); } int -clknode_fixed_register(struct clkdom *clkdom, struct clk_fixed_def *clkdef, - struct mtx *dev_mtx) +clknode_fixed_register(struct clkdom *clkdom, struct clk_fixed_def *clkdef) { struct clknode *clk; struct clknode_fixed_sc *sc; - if ((clkdef->freq == 0) && (clkdef->clkdef.parent_cnt == 0)) - panic("fixed clk: Frequency is not defined for clock source"); clk = clknode_create(clkdom, &clknode_fixed_class, &clkdef->clkdef); if (clk == NULL) return (1); sc = clknode_get_softc(clk); - sc->mtx = dev_mtx; sc->fixed_flags = clkdef->fixed_flags; sc->freq = clkdef->freq; sc->mult = clkdef->mult; @@ -112,3 +133,150 @@ clknode_fixed_register(struct clkdom *clkdom, struct clk_fixed_def *clkdef, clknode_register(clkdom, clk); return (0); } + +#ifdef FDT + +static struct ofw_compat_data compat_data[] = { + {"fixed-clock", CLK_TYPE_FIXED}, + {"fixed-factor-clock", CLK_TYPE_FIXED_FACTOR}, + {NULL, 0}, +}; + +struct clk_fixed_softc { + device_t dev; + struct clkdom *clkdom; +}; + +static int +clk_fixed_probe(device_t dev) +{ + intptr_t clk_type; + + clk_type = ofw_bus_search_compatible(dev, compat_data)->ocd_data; + switch (clk_type) { + case CLK_TYPE_FIXED: + device_set_desc(dev, "Fixed clock"); + return (BUS_PROBE_DEFAULT); + case CLK_TYPE_FIXED_FACTOR: + device_set_desc(dev, "Fixed factor clock"); + return (BUS_PROBE_DEFAULT); + default: + return (ENXIO); + } +} + +static int +clk_fixed_init_fixed(struct clk_fixed_softc *sc, phandle_t node, + struct clk_fixed_def *def) +{ + uint32_t freq; + int rv; + + def->clkdef.id = 1; + rv = OF_getencprop(node, "clock-frequency", &freq, sizeof(freq)); + if (rv <= 0) + return (ENXIO); + def->freq = freq; + return (0); +} + +static int +clk_fixed_init_fixed_factor(struct clk_fixed_softc *sc, phandle_t node, + struct clk_fixed_def *def) +{ + int rv; + clk_t parent; + + def->clkdef.id = 1; + rv = OF_getencprop(node, "clock-mult", &def->mult, sizeof(def->mult)); + if (rv <= 0) + return (ENXIO); + rv = OF_getencprop(node, "clock-div", &def->div, sizeof(def->div)); + if (rv <= 0) + return (ENXIO); + /* Get name of parent clock */ + rv = clk_get_by_ofw_index(sc->dev, 0, &parent); + if (rv != 0) + return (ENXIO); + def->clkdef.parent_names = malloc(sizeof(char *), M_OFWPROP, M_WAITOK); + def->clkdef.parent_names[0] = clk_get_name(parent); + def->clkdef.parent_cnt = 1; + clk_release(parent); + return (0); +} + +static int +clk_fixed_attach(device_t dev) +{ + struct clk_fixed_softc *sc; + intptr_t clk_type; + phandle_t node; + struct clk_fixed_def def; + int rv; + + sc = device_get_softc(dev); + sc->dev = dev; + node = ofw_bus_get_node(dev); + clk_type = ofw_bus_search_compatible(dev, compat_data)->ocd_data; + + bzero(&def, sizeof(def)); + if (clk_type == CLK_TYPE_FIXED) + rv = clk_fixed_init_fixed(sc, node, &def); + else if (clk_type == CLK_TYPE_FIXED_FACTOR) + rv = clk_fixed_init_fixed_factor(sc, node, &def); + else + rv = ENXIO; + if (rv != 0) { + device_printf(sc->dev, "Cannot FDT parameters.\n"); + goto fail; + } + rv = clk_parse_ofw_clk_name(dev, node, &def.clkdef.name); + if (rv != 0) { + device_printf(sc->dev, "Cannot parse clock name.\n"); + goto fail; + } + sc->clkdom = clkdom_create(dev); + KASSERT(sc->clkdom != NULL, ("Clock domain is NULL")); + + rv = clknode_fixed_register(sc->clkdom, &def); + if (rv != 0) { + device_printf(sc->dev, "Cannot register fixed clock.\n"); + rv = ENXIO; + goto fail; + } + + rv = clkdom_finit(sc->clkdom); + if (rv != 0) { + device_printf(sc->dev, "Clk domain finit fails.\n"); + rv = ENXIO; + goto fail; + } +#ifdef CLK_DEBUG + clkdom_dump(sc->clkdom); +#endif + free(__DECONST(char *, def.clkdef.name), M_OFWPROP); + free(def.clkdef.parent_names, M_OFWPROP); + return (bus_generic_attach(dev)); + +fail: + free(__DECONST(char *, def.clkdef.name), M_OFWPROP); + free(def.clkdef.parent_names, M_OFWPROP); + return (rv); +} + +static device_method_t clk_fixed_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, clk_fixed_probe), + DEVMETHOD(device_attach, clk_fixed_attach), + + DEVMETHOD_END +}; + +DEFINE_CLASS_0(clk_fixed, clk_fixed_driver, clk_fixed_methods, + sizeof(struct clk_fixed_softc)); +static devclass_t clk_fixed_devclass; +EARLY_DRIVER_MODULE(clk_fixed, simplebus, clk_fixed_driver, + clk_fixed_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); +MODULE_VERSION(clk_fixed, 1); + +#endif |
