freebsd-dev/sys/dev/ofw/ofw_cpu.c
Emmanuel Vadot bc9ba24ffc ofw_cpu: Add support for getting cpu clock via clock property
Nominal Mhz is either expressed via the clock-frequency property
or can be get via the clock property that holds the cpu clock.
Add support for the later.

Reviewed by:	nwhitehorn
Differential Revision:	https://reviews.freebsd.org/D16346
2018-07-31 20:50:50 +00:00

405 lines
11 KiB
C

/*-
* Copyright (C) 2009 Nathan Whitehorn
* Copyright (C) 2015 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by Andrew Turner
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <machine/bus.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/ofw_cpu.h>
#ifdef EXT_RESOURCES
#include <dev/extres/clk/clk.h>
#endif
static int ofw_cpulist_probe(device_t);
static int ofw_cpulist_attach(device_t);
static const struct ofw_bus_devinfo *ofw_cpulist_get_devinfo(device_t dev,
device_t child);
static MALLOC_DEFINE(M_OFWCPU, "ofwcpu", "OFW CPU device information");
struct ofw_cpulist_softc {
pcell_t sc_addr_cells;
};
static device_method_t ofw_cpulist_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ofw_cpulist_probe),
DEVMETHOD(device_attach, ofw_cpulist_attach),
/* Bus interface */
DEVMETHOD(bus_add_child, bus_generic_add_child),
DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_devinfo, ofw_cpulist_get_devinfo),
DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
DEVMETHOD_END
};
static driver_t ofw_cpulist_driver = {
"cpulist",
ofw_cpulist_methods,
sizeof(struct ofw_cpulist_softc)
};
static devclass_t ofw_cpulist_devclass;
DRIVER_MODULE(ofw_cpulist, ofwbus, ofw_cpulist_driver, ofw_cpulist_devclass,
0, 0);
static int
ofw_cpulist_probe(device_t dev)
{
const char *name;
name = ofw_bus_get_name(dev);
if (name == NULL || strcmp(name, "cpus") != 0)
return (ENXIO);
device_set_desc(dev, "Open Firmware CPU Group");
return (0);
}
static int
ofw_cpulist_attach(device_t dev)
{
struct ofw_cpulist_softc *sc;
phandle_t root, child;
device_t cdev;
struct ofw_bus_devinfo *dinfo;
sc = device_get_softc(dev);
root = ofw_bus_get_node(dev);
sc->sc_addr_cells = 1;
OF_getencprop(root, "#address-cells", &sc->sc_addr_cells,
sizeof(sc->sc_addr_cells));
for (child = OF_child(root); child != 0; child = OF_peer(child)) {
dinfo = malloc(sizeof(*dinfo), M_OFWCPU, M_WAITOK | M_ZERO);
if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
free(dinfo, M_OFWCPU);
continue;
}
cdev = device_add_child(dev, NULL, -1);
if (cdev == NULL) {
device_printf(dev, "<%s>: device_add_child failed\n",
dinfo->obd_name);
ofw_bus_gen_destroy_devinfo(dinfo);
free(dinfo, M_OFWCPU);
continue;
}
device_set_ivars(cdev, dinfo);
}
return (bus_generic_attach(dev));
}
static const struct ofw_bus_devinfo *
ofw_cpulist_get_devinfo(device_t dev, device_t child)
{
return (device_get_ivars(child));
}
static int ofw_cpu_probe(device_t);
static int ofw_cpu_attach(device_t);
static int ofw_cpu_read_ivar(device_t dev, device_t child, int index,
uintptr_t *result);
struct ofw_cpu_softc {
struct pcpu *sc_cpu_pcpu;
uint32_t sc_nominal_mhz;
boolean_t sc_reg_valid;
pcell_t sc_reg[2];
};
static device_method_t ofw_cpu_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ofw_cpu_probe),
DEVMETHOD(device_attach, ofw_cpu_attach),
/* Bus interface */
DEVMETHOD(bus_add_child, bus_generic_add_child),
DEVMETHOD(bus_read_ivar, ofw_cpu_read_ivar),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_activate_resource,bus_generic_activate_resource),
DEVMETHOD_END
};
static driver_t ofw_cpu_driver = {
"cpu",
ofw_cpu_methods,
sizeof(struct ofw_cpu_softc)
};
static devclass_t ofw_cpu_devclass;
DRIVER_MODULE(ofw_cpu, cpulist, ofw_cpu_driver, ofw_cpu_devclass, 0, 0);
static int
ofw_cpu_probe(device_t dev)
{
const char *type = ofw_bus_get_type(dev);
if (type == NULL || strcmp(type, "cpu") != 0)
return (ENXIO);
device_set_desc(dev, "Open Firmware CPU");
return (0);
}
static int
ofw_cpu_attach(device_t dev)
{
struct ofw_cpulist_softc *psc;
struct ofw_cpu_softc *sc;
phandle_t node;
pcell_t cell;
int rv;
#ifdef EXT_RESOURCES
clk_t cpuclk;
uint64_t freq;
#endif
sc = device_get_softc(dev);
psc = device_get_softc(device_get_parent(dev));
if (nitems(sc->sc_reg) < psc->sc_addr_cells) {
if (bootverbose)
device_printf(dev, "Too many address cells\n");
return (EINVAL);
}
node = ofw_bus_get_node(dev);
/* Read and validate the reg property for use later */
sc->sc_reg_valid = false;
rv = OF_getencprop(node, "reg", sc->sc_reg, sizeof(sc->sc_reg));
if (rv < 0)
device_printf(dev, "missing 'reg' property\n");
else if ((rv % 4) != 0) {
if (bootverbose)
device_printf(dev, "Malformed reg property\n");
} else if ((rv / 4) != psc->sc_addr_cells) {
if (bootverbose)
device_printf(dev, "Invalid reg size %u\n", rv);
} else
sc->sc_reg_valid = true;
#ifdef __powerpc__
/*
* On powerpc, "interrupt-servers" denotes a SMT CPU. Look for any
* thread on this CPU, and assign that.
*/
if (OF_hasprop(node, "ibm,ppc-interrupt-server#s")) {
struct cpuref cpuref;
cell_t *servers;
int i, nservers, rv;
if ((nservers = OF_getencprop_alloc(node,
"ibm,ppc-interrupt-server#s", (void **)&servers)) < 0)
return (ENXIO);
nservers /= sizeof(cell_t);
for (i = 0; i < nservers; i++) {
for (rv = platform_smp_first_cpu(&cpuref); rv == 0;
rv = platform_smp_next_cpu(&cpuref)) {
if (cpuref.cr_hwref == servers[i]) {
sc->sc_cpu_pcpu =
pcpu_find(cpuref.cr_cpuid);
if (sc->sc_cpu_pcpu == NULL) {
OF_prop_free(servers);
return (ENXIO);
}
break;
}
}
if (rv != ENOENT)
break;
}
OF_prop_free(servers);
if (sc->sc_cpu_pcpu == NULL) {
device_printf(dev, "No CPU found for this device.\n");
return (ENXIO);
}
} else
#endif
sc->sc_cpu_pcpu = pcpu_find(device_get_unit(dev));
if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) < 0) {
#ifdef EXT_RESOURCES
rv = clk_get_by_ofw_index(dev, 0, 0, &cpuclk);
if (rv == 0) {
rv = clk_get_freq(cpuclk, &freq);
if (rv != 0 && bootverbose)
device_printf(dev,
"Cannot get freq of property clocks\n");
else
sc->sc_nominal_mhz = freq / 1000000;
} else
#endif
{
if (bootverbose)
device_printf(dev,
"missing 'clock-frequency' property\n");
}
} else
sc->sc_nominal_mhz = cell / 1000000; /* convert to MHz */
if (sc->sc_nominal_mhz != 0 && bootverbose)
device_printf(dev, "Nominal frequency %dMhz\n",
sc->sc_nominal_mhz);
bus_generic_probe(dev);
return (bus_generic_attach(dev));
}
static int
ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
{
struct ofw_cpulist_softc *psc;
struct ofw_cpu_softc *sc;
sc = device_get_softc(dev);
switch (index) {
case CPU_IVAR_PCPU:
*result = (uintptr_t)sc->sc_cpu_pcpu;
return (0);
case CPU_IVAR_NOMINAL_MHZ:
if (sc->sc_nominal_mhz > 0) {
*result = (uintptr_t)sc->sc_nominal_mhz;
return (0);
}
break;
case CPU_IVAR_CPUID_SIZE:
psc = device_get_softc(device_get_parent(dev));
*result = psc->sc_addr_cells;
return (0);
case CPU_IVAR_CPUID:
if (sc->sc_reg_valid) {
*result = (uintptr_t)sc->sc_reg;
return (0);
}
break;
}
return (ENOENT);
}
int
ofw_cpu_early_foreach(ofw_cpu_foreach_cb callback, boolean_t only_runnable)
{
phandle_t node, child;
pcell_t addr_cells, reg[2];
char status[16];
char device_type[16];
u_int id, next_id;
int count, rv;
count = 0;
id = 0;
next_id = 0;
node = OF_finddevice("/cpus");
if (node == -1)
return (-1);
/* Find the number of cells in the cpu register */
if (OF_getencprop(node, "#address-cells", &addr_cells,
sizeof(addr_cells)) < 0)
return (-1);
for (child = OF_child(node); child != 0; child = OF_peer(child),
id = next_id) {
/* Check if child is a CPU */
memset(device_type, 0, sizeof(device_type));
rv = OF_getprop(child, "device_type", device_type,
sizeof(device_type) - 1);
if (rv < 0)
continue;
if (strcmp(device_type, "cpu") != 0)
continue;
/* We're processing CPU, update next_id used in the next iteration */
next_id++;
/*
* If we are filtering by runnable then limit to only
* those that have been enabled, or do provide a method
* to enable them.
*/
if (only_runnable) {
status[0] = '\0';
OF_getprop(child, "status", status, sizeof(status));
if (status[0] != '\0' && strcmp(status, "okay") != 0 &&
strcmp(status, "ok") != 0 &&
!OF_hasprop(child, "enable-method"))
continue;
}
/*
* Check we have a register to identify the cpu
*/
rv = OF_getencprop(child, "reg", reg,
addr_cells * sizeof(cell_t));
if (rv != addr_cells * sizeof(cell_t))
continue;
if (callback == NULL || callback(id, child, addr_cells, reg))
count++;
}
return (only_runnable ? count : id);
}