diff options
Diffstat (limited to 'sys/arm/freescale/imx/imx6_mp.c')
| -rw-r--r-- | sys/arm/freescale/imx/imx6_mp.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/sys/arm/freescale/imx/imx6_mp.c b/sys/arm/freescale/imx/imx6_mp.c new file mode 100644 index 000000000000..ea7c8cc3a293 --- /dev/null +++ b/sys/arm/freescale/imx/imx6_mp.c @@ -0,0 +1,163 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 2014 Juergen Weiss <weiss@uni-mainz.de> + * Copyright (c) 2014 Ian Lepore <ian@freebsd.org> + * 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/kernel.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/smp.h> + +#include <vm/vm.h> +#include <vm/pmap.h> + +#include <machine/cpu.h> +#include <machine/smp.h> +#include <machine/fdt.h> +#include <machine/intr.h> +#include <machine/platform.h> +#include <machine/platformvar.h> + +#include <arm/freescale/imx/imx6_machdep.h> + +#define SCU_PHYSBASE 0x00a00000 +#define SCU_SIZE 0x00001000 + +#define SCU_CONTROL_REG 0x00 +#define SCU_CONTROL_ENABLE (1 << 0) +#define SCU_CONFIG_REG 0x04 +#define SCU_CONFIG_REG_NCPU_MASK 0x03 +#define SCU_CPUPOWER_REG 0x08 +#define SCU_INV_TAGS_REG 0x0c +#define SCU_DIAG_CONTROL 0x30 +#define SCU_DIAG_DISABLE_MIGBIT (1 << 0) +#define SCU_FILTER_START_REG 0x40 +#define SCU_FILTER_END_REG 0x44 +#define SCU_SECURE_ACCESS_REG 0x50 +#define SCU_NONSECURE_ACCESS_REG 0x54 + +#define SRC_PHYSBASE 0x020d8000 +#define SRC_SIZE 0x4000 +#define SRC_CONTROL_REG 0x00 +#define SRC_CONTROL_C1ENA_SHIFT 22 /* Bit for Core 1 enable */ +#define SRC_CONTROL_C1RST_SHIFT 14 /* Bit for Core 1 reset */ +#define SRC_GPR0_C1FUNC 0x20 /* Register for Core 1 entry func */ +#define SRC_GPR1_C1ARG 0x24 /* Register for Core 1 entry arg */ + +void +imx6_mp_setmaxid(platform_t plat) +{ + bus_space_handle_t scu; + int hwcpu, ncpu; + uint32_t val; + + /* If we've already set the global vars don't bother to do it again. */ + if (mp_ncpus != 0) + return; + + if (bus_space_map(fdtbus_bs_tag, SCU_PHYSBASE, SCU_SIZE, 0, &scu) != 0) + panic("Couldn't map the SCU\n"); + val = bus_space_read_4(fdtbus_bs_tag, scu, SCU_CONFIG_REG); + hwcpu = (val & SCU_CONFIG_REG_NCPU_MASK) + 1; + bus_space_unmap(fdtbus_bs_tag, scu, SCU_SIZE); + + ncpu = hwcpu; + TUNABLE_INT_FETCH("hw.ncpu", &ncpu); + if (ncpu < 1 || ncpu > hwcpu) + ncpu = hwcpu; + + mp_ncpus = ncpu; + mp_maxid = ncpu - 1; +} + +void +imx6_mp_start_ap(platform_t plat) +{ + bus_space_handle_t scu; + bus_space_handle_t src; + + uint32_t val; + int i; + + if (bus_space_map(fdtbus_bs_tag, SCU_PHYSBASE, SCU_SIZE, 0, &scu) != 0) + panic("Couldn't map the SCU\n"); + if (bus_space_map(fdtbus_bs_tag, SRC_PHYSBASE, SRC_SIZE, 0, &src) != 0) + panic("Couldn't map the system reset controller (SRC)\n"); + + /* + * Invalidate SCU cache tags. The 0x0000ffff constant invalidates all + * ways on all cores 0-3. Per the ARM docs, it's harmless to write to + * the bits for cores that are not present. + */ + bus_space_write_4(fdtbus_bs_tag, scu, SCU_INV_TAGS_REG, 0x0000ffff); + + /* + * Erratum ARM/MP: 764369 (problems with cache maintenance). + * Setting the "disable-migratory bit" in the undocumented SCU + * Diagnostic Control Register helps work around the problem. + */ + val = bus_space_read_4(fdtbus_bs_tag, scu, SCU_DIAG_CONTROL); + bus_space_write_4(fdtbus_bs_tag, scu, SCU_DIAG_CONTROL, + val | SCU_DIAG_DISABLE_MIGBIT); + + /* + * Enable the SCU, then clean the cache on this core. After these two + * operations the cache tag ram in the SCU is coherent with the contents + * of the cache on this core. The other cores aren't running yet so + * their caches can't contain valid data yet, but we've initialized + * their SCU tag ram above, so they will be coherent from startup. + */ + val = bus_space_read_4(fdtbus_bs_tag, scu, SCU_CONTROL_REG); + bus_space_write_4(fdtbus_bs_tag, scu, SCU_CONTROL_REG, + val | SCU_CONTROL_ENABLE); + dcache_wbinv_poc_all(); + + /* + * For each AP core, set the entry point address and argument registers, + * and set the core-enable and core-reset bits in the control register. + */ + val = bus_space_read_4(fdtbus_bs_tag, src, SRC_CONTROL_REG); + for (i=1; i < mp_ncpus; i++) { + bus_space_write_4(fdtbus_bs_tag, src, SRC_GPR0_C1FUNC + 8*i, + pmap_kextract((vm_offset_t)mpentry)); + bus_space_write_4(fdtbus_bs_tag, src, SRC_GPR1_C1ARG + 8*i, 0); + + val |= ((1 << (SRC_CONTROL_C1ENA_SHIFT - 1 + i )) | + ( 1 << (SRC_CONTROL_C1RST_SHIFT - 1 + i))); + } + bus_space_write_4(fdtbus_bs_tag, src, SRC_CONTROL_REG, val); + + dsb(); + sev(); + + bus_space_unmap(fdtbus_bs_tag, scu, SCU_SIZE); + bus_space_unmap(fdtbus_bs_tag, src, SRC_SIZE); +} |