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soc_tegra124.c revision 1.19 
      1 /* $NetBSD: soc_tegra124.c,v 1.19 2018/10/18 09:01:53 skrll Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include "opt_tegra.h"
     30 #include "opt_multiprocessor.h"
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: soc_tegra124.c,v 1.19 2018/10/18 09:01:53 skrll Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/bus.h>
     37 #include <sys/cpu.h>
     38 #include <sys/device.h>
     39 
     40 #include <uvm/uvm_extern.h>
     41 
     42 #include <dev/fdt/fdtvar.h>
     43 
     44 #include <arm/cpufunc.h>
     45 
     46 #include <evbarm/fdt/machdep.h>
     47 
     48 #include <arm/nvidia/tegra_reg.h>
     49 #include <arm/nvidia/tegra_pmcreg.h>
     50 #include <arm/nvidia/tegra_var.h>
     51 
     52 #define EVP_RESET_VECTOR_0_REG	0x100
     53 
     54 void
     55 tegra124_mpstart(void)
     56 {
     57 #if defined(MULTIPROCESSOR)
     58 	bus_space_tag_t bst = &arm_generic_bs_tag;
     59 	bus_space_handle_t bsh;
     60 
     61 	bus_space_subregion(bst, tegra_ppsb_bsh,
     62 	    TEGRA_EVP_OFFSET, TEGRA_EVP_SIZE, &bsh);
     63 
     64 	arm_cpu_max = 1 + __SHIFTOUT(armreg_l2ctrl_read(), L2CTRL_NUMCPU);
     65 	KASSERT(arm_cpu_max == 4);
     66 
     67 	bus_space_write_4(bst, bsh, EVP_RESET_VECTOR_0_REG,
     68 	    (uint32_t)KERN_VTOPHYS((vaddr_t)cpu_mpstart));
     69 	bus_space_barrier(bst, bsh, EVP_RESET_VECTOR_0_REG, 4,
     70 	    BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
     71 	uint32_t started = 0;
     72 
     73 	tegra_pmc_power(PMC_PARTID_CPU1, true); started |= __BIT(1);
     74 	tegra_pmc_power(PMC_PARTID_CPU2, true); started |= __BIT(2);
     75 	tegra_pmc_power(PMC_PARTID_CPU3, true); started |= __BIT(3);
     76 
     77 	for (u_int i = 0x10000000; i > 0; i--) {
     78 		arm_dmb();
     79 		if (arm_cpu_hatched == started)
     80 			break;
     81 	}
     82 #endif
     83 }
     84