1 /*- 2 * Copyright (c) 2016 Michal Meloun <mmel@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/kernel.h> 33 #include <sys/lock.h> 34 #include <sys/mutex.h> 35 #include <sys/smp.h> 36 37 #include <vm/vm.h> 38 #include <vm/pmap.h> 39 40 #include <machine/cpu.h> 41 #include <machine/intr.h> 42 #include <machine/fdt.h> 43 #include <machine/smp.h> 44 #include <machine/platformvar.h> 45 #include <machine/pmap.h> 46 47 #include <arm/nvidia/tegra124/tegra124_mp.h> 48 49 #define PMC_PHYSBASE 0x7000e400 50 #define PMC_SIZE 0x400 51 #define PMC_CONTROL_REG 0x0 52 #define PMC_PWRGATE_TOGGLE 0x30 53 #define PCM_PWRGATE_TOGGLE_START (1 << 8) 54 #define PMC_PWRGATE_STATUS 0x38 55 56 #define TEGRA_EXCEPTION_VECTORS_BASE 0x6000F000 /* exception vectors */ 57 #define TEGRA_EXCEPTION_VECTORS_SIZE 1024 58 #define TEGRA_EXCEPTION_VECTOR_ENTRY 0x100 59 60 void 61 tegra124_mp_setmaxid(platform_t plat) 62 { 63 int ncpu; 64 65 /* If we've already set the global vars don't bother to do it again. */ 66 if (mp_ncpus != 0) 67 return; 68 69 /* Read current CP15 Cache Size ID Register */ 70 ncpu = cp15_l2ctlr_get(); 71 ncpu = CPUV7_L2CTLR_NPROC(ncpu); 72 73 mp_ncpus = ncpu; 74 mp_maxid = ncpu - 1; 75 } 76 77 void 78 tegra124_mp_start_ap(platform_t plat) 79 { 80 bus_space_handle_t pmc; 81 bus_space_handle_t exvec; 82 int i; 83 uint32_t val; 84 uint32_t mask; 85 86 if (bus_space_map(fdtbus_bs_tag, PMC_PHYSBASE, PMC_SIZE, 0, &pmc) != 0) 87 panic("Couldn't map the PMC\n"); 88 if (bus_space_map(fdtbus_bs_tag, TEGRA_EXCEPTION_VECTORS_BASE, 89 TEGRA_EXCEPTION_VECTORS_SIZE, 0, &exvec) != 0) 90 panic("Couldn't map the exception vectors\n"); 91 92 bus_space_write_4(fdtbus_bs_tag, exvec , TEGRA_EXCEPTION_VECTOR_ENTRY, 93 pmap_kextract((vm_offset_t)mpentry)); 94 bus_space_read_4(fdtbus_bs_tag, exvec , TEGRA_EXCEPTION_VECTOR_ENTRY); 95 96 97 /* Wait until POWERGATE is ready (max 20 APB cycles). */ 98 do { 99 val = bus_space_read_4(fdtbus_bs_tag, pmc, 100 PMC_PWRGATE_TOGGLE); 101 } while ((val & PCM_PWRGATE_TOGGLE_START) != 0); 102 103 for (i = 1; i < mp_ncpus; i++) { 104 val = bus_space_read_4(fdtbus_bs_tag, pmc, PMC_PWRGATE_STATUS); 105 mask = 1 << (i + 8); /* cpu mask */ 106 if ((val & mask) == 0) { 107 /* Wait until POWERGATE is ready (max 20 APB cycles). */ 108 do { 109 val = bus_space_read_4(fdtbus_bs_tag, pmc, 110 PMC_PWRGATE_TOGGLE); 111 } while ((val & PCM_PWRGATE_TOGGLE_START) != 0); 112 bus_space_write_4(fdtbus_bs_tag, pmc, 113 PMC_PWRGATE_TOGGLE, 114 PCM_PWRGATE_TOGGLE_START | (8 + i)); 115 116 /* Wait until CPU is powered */ 117 do { 118 val = bus_space_read_4(fdtbus_bs_tag, pmc, 119 PMC_PWRGATE_STATUS); 120 } while ((val & mask) == 0); 121 } 122 123 } 124 dsb(); 125 sev(); 126 bus_space_unmap(fdtbus_bs_tag, pmc, PMC_SIZE); 127 bus_space_unmap(fdtbus_bs_tag, exvec, TEGRA_EXCEPTION_VECTORS_SIZE); 128 } 129