1/* $OpenBSD: amlsm.c,v 1.3 2021/10/24 17:52:26 mpi Exp $ */ 2/* 3 * Copyright (c) 2020 Mark Kettenis <kettenis@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18#include <sys/param.h> 19#include <sys/systm.h> 20#include <sys/device.h> 21#include <sys/timeout.h> 22 23#include <machine/bus.h> 24#include <machine/fdt.h> 25 26#include <dev/ofw/openfirm.h> 27#include <dev/ofw/fdt.h> 28#include <dev/ofw/ofw_misc.h> 29 30extern register_t smc_call(register_t, register_t, register_t, register_t); 31 32/* Calls */ 33#define AML_SM_GET_SHARE_MEM_INPUT_BASE 0x82000020 34#define AML_SM_GET_SHARE_MEM_OUTPUT_BASE 0x82000021 35#define AML_SM_EFUSE_READ 0x82000030 36#define AML_SM_EFUSE_USER_MAX 0x82000033 37#define AML_SM_JTAG_ON 0x82000040 38#define AML_SM_JTAG_OFF 0x82000041 39#define AML_SM_GET_CHIP_ID 0x82000044 40 41struct aml_cpu_info { 42 uint32_t version; 43 uint32_t chip_id[4]; 44}; 45 46struct amlsm_softc { 47 struct device sc_dev; 48 bus_space_tag_t sc_iot; 49 bus_space_handle_t sc_in_ioh; 50 bus_space_handle_t sc_out_ioh; 51}; 52 53int amlsm_match(struct device *, void *, void *); 54void amlsm_attach(struct device *, struct device *, void *); 55 56const struct cfattach amlsm_ca = { 57 sizeof (struct amlsm_softc), amlsm_match, amlsm_attach 58}; 59 60struct cfdriver amlsm_cd = { 61 NULL, "amlsm", DV_DULL 62}; 63 64int 65amlsm_match(struct device *parent, void *match, void *aux) 66{ 67 struct fdt_attach_args *faa = aux; 68 69 return OF_is_compatible(faa->fa_node, "amlogic,meson-gxbb-sm"); 70} 71 72void 73amlsm_attach(struct device *parent, struct device *self, void *aux) 74{ 75 struct amlsm_softc *sc = (struct amlsm_softc *)self; 76 struct fdt_attach_args *faa = aux; 77 struct aml_cpu_info *info; 78 bus_addr_t addr; 79 int32_t ret; 80 int i; 81 82 sc->sc_iot = faa->fa_iot; 83 84 addr = smc_call(AML_SM_GET_SHARE_MEM_INPUT_BASE, 0, 0, 0); 85 if (addr == (bus_addr_t)-1 || 86 bus_space_map(sc->sc_iot, addr, PAGE_SIZE, 87 BUS_SPACE_MAP_CACHEABLE, &sc->sc_in_ioh)) { 88 printf(": can't map shared memory\n"); 89 return; 90 } 91 addr = smc_call(AML_SM_GET_SHARE_MEM_OUTPUT_BASE, 0, 0, 0); 92 if (addr == (bus_addr_t)-1 || 93 bus_space_map(sc->sc_iot, addr, PAGE_SIZE, 94 BUS_SPACE_MAP_CACHEABLE, &sc->sc_out_ioh)) { 95 bus_space_unmap(sc->sc_iot, sc->sc_in_ioh, PAGE_SIZE); 96 printf(": can't map shared memory\n"); 97 return; 98 } 99 100 /* 101 * Version 2 gives us a 16-byte chip ID. If that fails, fall 102 * back on version 0/1 which gives us a 12-byte chipt ID. 103 */ 104 info = bus_space_vaddr(sc->sc_iot, sc->sc_out_ioh); 105 memset(info, 0, sizeof(struct aml_cpu_info)); 106 ret = smc_call(AML_SM_GET_CHIP_ID, 2, 0, 0); 107 if (ret == -1) 108 ret = smc_call(AML_SM_GET_CHIP_ID, 0, 0, 0); 109 110 printf(": ver %u\n", info->version); 111 112 if (ret != -1) { 113 for (i = 0; i < nitems(info->chip_id); i++) 114 enqueue_randomness(info->chip_id[i]); 115 } 116} 117