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133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/* $NetBSD: omap2_prcm.c,v 1.5 2013/06/29 20:19:54 matt Exp $ */
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/*-
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* Copyright (c) 2010 Adam Hoka
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "opt_omap.h"
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: omap2_prcm.c,v 1.5 2013/06/29 20:19:54 matt Exp $");
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#include <sys/param.h>
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#include <sys/device.h>
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#include <sys/bus.h>
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#include <arm/omap/omap_var.h>
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#include <arm/omap/omap2_obiovar.h>
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#include <arm/omap/omap2_reg.h>
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#include <arm/omap/omap2_prcm.h>
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#include "locators.h"
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struct prcm_softc {
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device_t sc_dev;
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bus_space_tag_t sc_iot;
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bus_space_handle_t sc_ioh;
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bus_addr_t sc_base;
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bus_size_t sc_size;
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};
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/* for external access to prcm operations */
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struct prcm_softc prcm_sc = {
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.sc_iot = &omap_bs_tag,
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.sc_size = OMAP2_PRM_SIZE,
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};
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/* prototypes */
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static int prcm_match(device_t, cfdata_t, void *);
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static void prcm_attach(device_t, device_t, void *);
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/* attach structures */
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CFATTACH_DECL_NEW(prcm, 0,
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prcm_match, prcm_attach, NULL, NULL);
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static int
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prcm_match(device_t parent, cfdata_t match, void *aux)
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{
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struct obio_attach_args *obio = aux;
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if (obio->obio_addr != OBIOCF_ADDR_DEFAULT)
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return 1;
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return 0;
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}
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static void
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prcm_attach(device_t parent, device_t self, void *aux)
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{
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struct obio_attach_args *obio = aux;
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KASSERT(prcm_sc.sc_dev == NULL);
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self->dv_private = &prcm_sc;
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prcm_sc.sc_dev = self;
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prcm_sc.sc_base = obio->obio_addr;
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/* map i/o space for PRM */
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if (bus_space_map(prcm_sc.sc_iot, prcm_sc.sc_base, prcm_sc.sc_size,
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0, &prcm_sc.sc_ioh) != 0) {
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aprint_error("prcm_attach: can't map i/o space for prm");
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return;
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}
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aprint_normal(": Power, Reset and Clock Management\n");
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}
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void
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prcm_bootstrap(bus_space_handle_t ioh)
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{
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prcm_sc.sc_ioh = ioh;
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}
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uint32_t
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prcm_read_4(bus_size_t module, bus_size_t reg)
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{
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KASSERT(prcm_sc.sc_ioh != 0);
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return bus_space_read_4(prcm_sc.sc_iot, prcm_sc.sc_ioh, module + reg);
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}
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void
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prcm_write_4(bus_size_t module, bus_size_t reg, uint32_t data)
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{
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KASSERT(prcm_sc.sc_ioh != 0);
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bus_space_write_4(prcm_sc.sc_iot, prcm_sc.sc_ioh, module + reg, data);
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}
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void
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prcm_cold_reset(void)
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{
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uint32_t val;
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val = prcm_read_4(OMAP3430_GR_MOD, OMAP2_RM_RSTCTRL);
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val |= OMAP_RST_DPLL3;
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prcm_write_4(OMAP3430_GR_MOD, OMAP2_RM_RSTCTRL, val);
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}
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