IABSD.fr/src/sys/dev/fdt/amlsm.c

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• Author : deraadt
  Date : 2020-05-29 04:42:23
  Hash : c8f27247
  Message : dev/rndvar.h no longer has statistical interfaces (removed during various conversion steps). it only contains kernel prototypes for 4 interfaces, all of which legitimately belong in sys/systm.h, which are already included by all enqueue_randomness() users.

• sys/dev/fdt/amlsm.c

• /*	$OpenBSD: amlsm.c,v 1.2 2020/05/29 04:42:25 deraadt Exp $	*/
  /*
   * Copyright (c) 2020 Mark Kettenis <kettenis@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/device.h>
  #include <sys/timeout.h>
  
  #include <machine/bus.h>
  #include <machine/fdt.h>
  
  #include <dev/ofw/openfirm.h>
  #include <dev/ofw/fdt.h>
  #include <dev/ofw/ofw_misc.h>
  
  extern register_t smc_call(register_t, register_t, register_t, register_t);
  
  /* Calls */
  #define AML_SM_GET_SHARE_MEM_INPUT_BASE		0x82000020
  #define AML_SM_GET_SHARE_MEM_OUTPUT_BASE	0x82000021
  #define AML_SM_EFUSE_READ			0x82000030
  #define AML_SM_EFUSE_USER_MAX			0x82000033
  #define AML_SM_JTAG_ON				0x82000040
  #define AML_SM_JTAG_OFF				0x82000041
  #define AML_SM_GET_CHIP_ID			0x82000044
  
  struct aml_cpu_info {
  	uint32_t	version;
  	uint32_t	chip_id[4];
  };
  
  struct amlsm_softc {
  	struct device		sc_dev;
  	bus_space_tag_t		sc_iot;
  	bus_space_handle_t	sc_in_ioh;
  	bus_space_handle_t	sc_out_ioh;
  };
  
  int	amlsm_match(struct device *, void *, void *);
  void	amlsm_attach(struct device *, struct device *, void *);
  
  struct cfattach	amlsm_ca = {
  	sizeof (struct amlsm_softc), amlsm_match, amlsm_attach
  };
  
  struct cfdriver amlsm_cd = {
  	NULL, "amlsm", DV_DULL
  };
  
  int
  amlsm_match(struct device *parent, void *match, void *aux)
  {
  	struct fdt_attach_args *faa = aux;
  
  	return OF_is_compatible(faa->fa_node, "amlogic,meson-gxbb-sm");
  }
  
  void
  amlsm_attach(struct device *parent, struct device *self, void *aux)
  {
  	struct amlsm_softc *sc = (struct amlsm_softc *)self;
  	struct fdt_attach_args *faa = aux;
  	struct aml_cpu_info *info;
  	bus_addr_t addr;
  	int32_t ret;
  	int i;
  
  	sc->sc_iot = faa->fa_iot;
  
  	addr = smc_call(AML_SM_GET_SHARE_MEM_INPUT_BASE, 0, 0, 0);
  	if (addr == (bus_addr_t)-1 ||
  	    bus_space_map(sc->sc_iot, addr, PAGE_SIZE,
  	    BUS_SPACE_MAP_CACHEABLE, &sc->sc_in_ioh)) {
  		printf(": can't map shared memory\n");
  		return;
  	}
  	addr = smc_call(AML_SM_GET_SHARE_MEM_OUTPUT_BASE, 0, 0, 0);
  	if (addr == (bus_addr_t)-1 ||
  	    bus_space_map(sc->sc_iot, addr, PAGE_SIZE,
  	    BUS_SPACE_MAP_CACHEABLE, &sc->sc_out_ioh)) {
  		bus_space_unmap(sc->sc_iot, sc->sc_in_ioh, PAGE_SIZE);
  		printf(": can't map shared memory\n");
  		return;
  	}
  
  	/*
  	 * Version 2 gives us a 16-byte chip ID.  If that fails, fall
  	 * back on version 0/1 which gives us a 12-byte chipt ID.
  	 */
  	info = bus_space_vaddr(sc->sc_iot, sc->sc_out_ioh);
  	memset(info, 0, sizeof(struct aml_cpu_info));
  	ret = smc_call(AML_SM_GET_CHIP_ID, 2, 0, 0);
  	if (ret == -1)
  		ret = smc_call(AML_SM_GET_CHIP_ID, 0, 0, 0);
  
  	printf(": ver %u\n", info->version);
  	
  	if (ret != -1) {
  		for (i = 0; i < nitems(info->chip_id); i++)
  			enqueue_randomness(info->chip_id[i]);
  	}
  }