octeon_rnm.c revision 1.1
1 /* $NetBSD: octeon_rnm.c,v 1.1 2015/04/29 08:32:01 hikaru Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Internet Initiative Japan, Inc. 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 REGENTS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, 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 <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: octeon_rnm.c,v 1.1 2015/04/29 08:32:01 hikaru Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/device.h> 34 #include <sys/systm.h> 35 #include <sys/sysctl.h> 36 #include <sys/kernel.h> 37 #include <sys/rndsource.h> 38 39 #include <mips/locore.h> 40 #include <mips/cavium/include/iobusvar.h> 41 #include <mips/cavium/dev/octeon_rnmreg.h> 42 #include <mips/cavium/dev/octeon_corereg.h> 43 #include <mips/cavium/octeonvar.h> 44 45 #include <sys/bus.h> 46 #include <machine/param.h> 47 48 #define RNG_DELAY_CLOCK 91 49 #define RNG_DEF_BURST_COUNT 10 50 51 int octeon_rnm_burst_count = RNG_DEF_BURST_COUNT; 52 53 struct octeon_rnm_softc { 54 device_t sc_dev; 55 56 bus_space_tag_t sc_bust; 57 bus_space_handle_t sc_regh; 58 59 krndsource_t sc_rndsrc; /* /dev/random source */ 60 struct callout sc_rngto; /* rng timeout */ 61 int sc_rnghz; /* rng poll time */ 62 }; 63 64 static int octeon_rnm_match(device_t, struct cfdata *, void *); 65 static void octeon_rnm_attach(device_t, device_t, void *); 66 static void octeon_rnm_rng(void *); 67 static inline uint64_t octeon_rnm_load(struct octeon_rnm_softc *); 68 static inline int octeon_rnm_iobdma(struct octeon_rnm_softc *); 69 70 CFATTACH_DECL_NEW(octeon_rnm, sizeof(struct octeon_rnm_softc), 71 octeon_rnm_match, octeon_rnm_attach, NULL, NULL); 72 73 static int 74 octeon_rnm_match(device_t parent, struct cfdata *cf, void *aux) 75 { 76 struct iobus_attach_args *aa = aux; 77 int result = 0; 78 79 if (strcmp(cf->cf_name, aa->aa_name) != 0) 80 goto out; 81 if (cf->cf_unit != aa->aa_unitno) 82 goto out; 83 result = 1; 84 85 out: 86 return result; 87 } 88 89 static void 90 octeon_rnm_attach(device_t parent, device_t self, void *aux) 91 { 92 struct octeon_rnm_softc *sc = device_private(self); 93 struct iobus_attach_args *aa = aux; 94 int status; 95 96 aprint_normal("\n"); 97 98 sc->sc_dev = self; 99 sc->sc_bust = aa->aa_bust; 100 status = bus_space_map(aa->aa_bust, aa->aa_unit->addr, RNM_SIZE, 101 0, &sc->sc_regh); 102 if (status != 0) 103 panic(": can't map i/o space"); 104 105 bus_space_write_8(sc->sc_bust, sc->sc_regh, RNM_CTL_STATUS_OFFSET, 106 RNM_CTL_STATUS_RNG_EN | RNM_CTL_STATUS_ENT_EN); 107 108 if (hz >= 100) 109 sc->sc_rnghz = hz / 100; 110 else 111 sc->sc_rnghz = 1; 112 113 rnd_attach_source(&sc->sc_rndsrc, device_xname(sc->sc_dev), 114 RND_TYPE_RNG, RND_FLAG_NO_ESTIMATE); 115 116 callout_init(&sc->sc_rngto, 0); 117 118 octeon_rnm_rng(sc); 119 120 aprint_normal("%s: random number generator enabled: %dhz\n", 121 device_xname(sc->sc_dev), sc->sc_rnghz); 122 } 123 124 static void 125 octeon_rnm_rng(void *vsc) 126 { 127 struct octeon_rnm_softc *sc = vsc; 128 uint64_t rn; 129 int i; 130 131 for (i = 0; i < octeon_rnm_burst_count; i++) { 132 rn = octeon_rnm_load(sc); 133 rnd_add_data(&sc->sc_rndsrc, 134 &rn, sizeof(rn), sizeof(rn) * NBBY); 135 /* 136 * XXX 137 * delay should be over RNG_DELAY_CLOCK cycles at least, 138 * we need nanodelay() or clkdelay(). 139 */ 140 delay(1); 141 } 142 143 callout_reset(&sc->sc_rngto, sc->sc_rnghz, octeon_rnm_rng, sc); 144 } 145 146 static inline uint64_t 147 octeon_rnm_load(struct octeon_rnm_softc *sc) 148 { 149 uint64_t addr = 150 RNM_OPERATION_BASE_IO_BIT | 151 __BITS64_SET(RNM_OPERATION_BASE_MAJOR_DID, 0x08) | 152 __BITS64_SET(RNM_OPERATION_BASE_SUB_DID, 0x00); 153 154 return octeon_xkphys_read_8(addr); 155 } 156 157 static inline int 158 octeon_rnm_iobdma(struct octeon_rnm_softc *sc) 159 { 160 161 /* XXX */ 162 return 0; 163 } 164 165 SYSCTL_SETUP(octeon_rnm_sysctl, "sysctl octeon_rnm subtree setup") 166 { 167 int rc, root_num; 168 const struct sysctlnode *node; 169 170 if ( (rc = sysctl_createv(clog, 0, NULL, NULL, 171 CTLFLAG_PERMANENT, CTLTYPE_NODE, "hw", NULL, 172 NULL, 0, NULL, 0, CTL_HW, CTL_EOL)) != 0) { 173 goto err; 174 } 175 176 if ( (rc = sysctl_createv(clog, 0, NULL, &node, 177 CTLFLAG_PERMANENT, CTLTYPE_NODE, "octeon_rnm", 178 SYSCTL_DESCR("octeon_rnm controls"), 179 NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL)) != 0) { 180 goto err; 181 } 182 183 root_num = node->sysctl_num; 184 185 if ( (rc = sysctl_createv(clog, 0, NULL, NULL, 186 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 187 CTLTYPE_INT, "burst_count", 188 SYSCTL_DESCR("Burst read count per callout"), 189 NULL, 0, &octeon_rnm_burst_count, 190 0, CTL_HW, root_num, CTL_CREATE, CTL_EOL)) != 0) { 191 goto err; 192 } 193 194 return; 195 err: 196 printf("%s: sysctl_createv failed (rc = %d)\n", __func__, rc); 197 } 198
Indexes created Tue Sep 30 20:09:53 GMT 2025