Date: Fri, 21 Jul 2017 03:40:05 +0000 (UTC) From: Justin Hibbits <jhibbits@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r321318 - in head/sys: conf powerpc/cpufreq Message-ID: <201707210340.v6L3e5HA090963@repo.freebsd.org>
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Author: jhibbits Date: Fri Jul 21 03:40:05 2017 New Revision: 321318 URL: https://svnweb.freebsd.org/changeset/base/321318 Log: Add cpufreq support for P1022 and MPC8536 P1022 and MPC8536 include a 'jog' feature for clock control (jog being a slower form of run mode). This is done by changing the PLL multiplier, and cannot be done if any core is in doze or sleep mode. Added: head/sys/powerpc/cpufreq/mpc85xx_jog.c (contents, props changed) Modified: head/sys/conf/files.powerpc Modified: head/sys/conf/files.powerpc ============================================================================== --- head/sys/conf/files.powerpc Fri Jul 21 03:28:35 2017 (r321317) +++ head/sys/conf/files.powerpc Fri Jul 21 03:40:05 2017 (r321318) @@ -118,6 +118,7 @@ powerpc/booke/platform_bare.c optional booke powerpc/booke/pmap.c optional booke powerpc/booke/spe.c optional powerpcspe powerpc/cpufreq/dfs.c optional cpufreq +powerpc/cpufreq/mpc85xx_jog.c optional cpufreq mpc85xx powerpc/cpufreq/pcr.c optional cpufreq aim powerpc/cpufreq/pmufreq.c optional cpufreq aim pmu powerpc/fpu/fpu_add.c optional fpu_emu Added: head/sys/powerpc/cpufreq/mpc85xx_jog.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/powerpc/cpufreq/mpc85xx_jog.c Fri Jul 21 03:40:05 2017 (r321318) @@ -0,0 +1,343 @@ +/*- + * Copyright (c) 2017 Justin Hibbits + * All rights reserved. + * + * 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 ``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 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/bus.h> +#include <sys/cpu.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/smp.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <machine/cpu.h> + +#include <powerpc/mpc85xx/mpc85xx.h> + +#include "cpufreq_if.h" + +/* No worries about uint32_t math overflow in here, because the highest + * multiplier supported is 4, and the highest speed part is still well below + * 2GHz. + */ + +#define GUTS_PORPLLSR (CCSRBAR_VA + 0xe0000) +#define GUTS_PMJCR (CCSRBAR_VA + 0xe007c) +#define PMJCR_RATIO_M 0x3f +#define PMJCR_CORE_MULT(x,y) ((x) << (16 + ((y) * 8))) +#define PMJCR_GET_CORE_MULT(x,y) (((x) >> (16 + ((y) * 8))) & 0x3f) +#define GUTS_POWMGTCSR (CCSRBAR_VA + 0xe0080) +#define POWMGTCSR_JOG 0x00200000 +#define POWMGTCSR_INT_MASK 0x00000f00 + +#define MHZ 1000000 + +struct mpc85xx_jog_softc { + device_t dev; + int cpu; + int low; + int high; + int min_freq; +}; + +static struct ofw_compat_data *mpc85xx_jog_devcompat(void); +static void mpc85xx_jog_identify(driver_t *driver, device_t parent); +static int mpc85xx_jog_probe(device_t dev); +static int mpc85xx_jog_attach(device_t dev); +static int mpc85xx_jog_settings(device_t dev, struct cf_setting *sets, int *count); +static int mpc85xx_jog_set(device_t dev, const struct cf_setting *set); +static int mpc85xx_jog_get(device_t dev, struct cf_setting *set); +static int mpc85xx_jog_type(device_t dev, int *type); + +static device_method_t mpc85xx_jog_methods[] = { + /* Device interface */ + DEVMETHOD(device_identify, mpc85xx_jog_identify), + DEVMETHOD(device_probe, mpc85xx_jog_probe), + DEVMETHOD(device_attach, mpc85xx_jog_attach), + + /* cpufreq interface */ + DEVMETHOD(cpufreq_drv_set, mpc85xx_jog_set), + DEVMETHOD(cpufreq_drv_get, mpc85xx_jog_get), + DEVMETHOD(cpufreq_drv_type, mpc85xx_jog_type), + DEVMETHOD(cpufreq_drv_settings, mpc85xx_jog_settings), + + {0, 0} +}; + +static driver_t mpc85xx_jog_driver = { + "jog", + mpc85xx_jog_methods, + sizeof(struct mpc85xx_jog_softc) +}; + +static devclass_t mpc85xx_jog_devclass; +DRIVER_MODULE(mpc85xx_jog, cpu, mpc85xx_jog_driver, mpc85xx_jog_devclass, 0, 0); + +struct mpc85xx_constraints { + int threshold; /* Threshold frequency, in MHz, for setting CORE_SPD bit. */ + int min_mult; /* Minimum PLL multiplier. */ +}; + +static struct mpc85xx_constraints mpc8536_constraints = { + 800, + 3 +}; + +static struct mpc85xx_constraints p1022_constraints = { + 500, + 2 +}; + +static struct ofw_compat_data jog_compat[] = { + {"fsl,mpc8536-guts", (uintptr_t)&mpc8536_constraints}, + {"fsl,p1022-guts", (uintptr_t)&p1022_constraints}, + {NULL, 0} +}; + +static struct ofw_compat_data * +mpc85xx_jog_devcompat() +{ + phandle_t node; + int i; + + node = OF_finddevice("/soc"); + if (node <= 0) + return (NULL); + + for (i = 0; jog_compat[i].ocd_str != NULL; i++) + if (ofw_bus_find_compatible(node, jog_compat[i].ocd_str) > 0) + break; + + if (jog_compat[i].ocd_str == NULL) + return (NULL); + + return (&jog_compat[i]); +} + +static void +mpc85xx_jog_identify(driver_t *driver, device_t parent) +{ + struct ofw_compat_data *compat; + + /* Make sure we're not being doubly invoked. */ + if (device_find_child(parent, "mpc85xx_jog", -1) != NULL) + return; + + compat = mpc85xx_jog_devcompat(); + if (compat == NULL) + return; + + /* + * We attach a child for every CPU since settings need to + * be performed on every CPU in the SMP case. + */ + if (BUS_ADD_CHILD(parent, 10, "jog", -1) == NULL) + device_printf(parent, "add jog child failed\n"); +} + +static int +mpc85xx_jog_probe(device_t dev) +{ + struct ofw_compat_data *compat; + + compat = mpc85xx_jog_devcompat(); + if (compat == NULL || compat->ocd_str == NULL) + return (ENXIO); + + device_set_desc(dev, "Freescale CPU Jogger"); + return (0); +} + +static int +mpc85xx_jog_attach(device_t dev) +{ + struct ofw_compat_data *compat; + struct mpc85xx_jog_softc *sc; + struct mpc85xx_constraints *constraints; + phandle_t cpu; + uint32_t reg; + + sc = device_get_softc(dev); + sc->dev = dev; + + compat = mpc85xx_jog_devcompat(); + constraints = (struct mpc85xx_constraints *)compat->ocd_data; + cpu = ofw_bus_get_node(device_get_parent(dev)); + + if (cpu <= 0) { + device_printf(dev,"No CPU device tree node!\n"); + return (ENXIO); + } + + OF_getencprop(cpu, "reg", &sc->cpu, sizeof(sc->cpu)); + + reg = ccsr_read4(GUTS_PORPLLSR); + + /* + * Assume power-on PLL is the highest PLL config supported on the + * board. + */ + sc->high = PMJCR_GET_CORE_MULT(reg, sc->cpu); + sc->min_freq = constraints->threshold; + sc->low = constraints->min_mult; + + cpufreq_register(dev); + return (0); +} + +static int +mpc85xx_jog_settings(device_t dev, struct cf_setting *sets, int *count) +{ + struct mpc85xx_jog_softc *sc; + uint32_t sysclk; + int i; + + sc = device_get_softc(dev); + if (sets == NULL || count == NULL) + return (EINVAL); + if (*count < sc->high - 1) + return (E2BIG); + + sysclk = mpc85xx_get_system_clock(); + /* Return a list of valid settings for this driver. */ + memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * sc->high); + + for (i = sc->high; i >= sc->low; --i) { + sets[sc->high - i].freq = sysclk * i / MHZ; + sets[sc->high - i].dev = dev; + sets[sc->high - i].spec[0] = i; + } + *count = sc->high - sc->low + 1; + + return (0); +} + +struct jog_rv_args { + int cpu; + int mult; + int slow; + volatile int inprogress; +}; + +static void +mpc85xx_jog_set_int(void *arg) +{ + struct jog_rv_args *args = arg; + uint32_t reg; + + if (PCPU_GET(cpuid) == args->cpu) { + reg = ccsr_read4(GUTS_PMJCR); + reg &= ~PMJCR_CORE_MULT(PMJCR_RATIO_M, args->cpu); + reg |= PMJCR_CORE_MULT(args->mult, args->cpu); + if (args->slow) + reg &= ~(1 << (12 + args->cpu)); + else + reg |= (1 << (12 + args->cpu)); + + ccsr_write4(GUTS_PMJCR, reg); + + reg = ccsr_read4(GUTS_POWMGTCSR); + reg |= POWMGTCSR_JOG | POWMGTCSR_INT_MASK; + ccsr_write4(GUTS_POWMGTCSR, reg); + + /* Wait for completion */ + do { + DELAY(100); + reg = ccsr_read4(GUTS_POWMGTCSR); + } while (reg & POWMGTCSR_JOG); + + reg = ccsr_read4(GUTS_POWMGTCSR); + ccsr_write4(GUTS_POWMGTCSR, reg & ~POWMGTCSR_INT_MASK); + ccsr_read4(GUTS_POWMGTCSR); + + args->inprogress = 0; + } else { + while (args->inprogress) + cpu_spinwait(); + } +} + +static int +mpc85xx_jog_set(device_t dev, const struct cf_setting *set) +{ + struct mpc85xx_jog_softc *sc; + struct jog_rv_args args; + + if (set == NULL) + return (EINVAL); + + sc = device_get_softc(dev); + + args.slow = (set->freq <= sc->min_freq); + args.mult = set->spec[0]; + args.cpu = PCPU_GET(cpuid); + args.inprogress = 1; + smp_rendezvous(smp_no_rendezvous_barrier, mpc85xx_jog_set_int, + smp_no_rendezvous_barrier, &args); + + return (0); +} + +static int +mpc85xx_jog_get(device_t dev, struct cf_setting *set) +{ + struct mpc85xx_jog_softc *sc; + uint32_t pmjcr; + uint32_t freq; + + if (set == NULL) + return (EINVAL); + + sc = device_get_softc(dev); + memset(set, CPUFREQ_VAL_UNKNOWN, sizeof(*set)); + + pmjcr = ccsr_read4(GUTS_PORPLLSR); + freq = PMJCR_GET_CORE_MULT(pmjcr, sc->cpu); + freq *= mpc85xx_get_system_clock(); + freq /= MHZ; + + set->freq = freq; + set->dev = dev; + + return (0); +} + +static int +mpc85xx_jog_type(device_t dev, int *type) +{ + + if (type == NULL) + return (EINVAL); + + *type = CPUFREQ_TYPE_ABSOLUTE; + return (0); +} +
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