tegra_pmc.c revision 1.3
1/* $NetBSD: tegra_pmc.c,v 1.3 2015/04/26 22:04:28 jmcneill Exp $ */ 2 3/*- 4 * Copyright (c) 2015 Jared D. McNeill <jmcneill@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 "locators.h" 30 31#include <sys/cdefs.h> 32__KERNEL_RCSID(0, "$NetBSD: tegra_pmc.c,v 1.3 2015/04/26 22:04:28 jmcneill Exp $"); 33 34#include <sys/param.h> 35#include <sys/bus.h> 36#include <sys/device.h> 37#include <sys/intr.h> 38#include <sys/systm.h> 39#include <sys/kernel.h> 40 41#include <arm/nvidia/tegra_reg.h> 42#include <arm/nvidia/tegra_pmcreg.h> 43#include <arm/nvidia/tegra_var.h> 44 45static int tegra_pmc_match(device_t, cfdata_t, void *); 46static void tegra_pmc_attach(device_t, device_t, void *); 47 48struct tegra_pmc_softc { 49 device_t sc_dev; 50 bus_space_tag_t sc_bst; 51 bus_space_handle_t sc_bsh; 52}; 53 54static struct tegra_pmc_softc *pmc_softc = NULL; 55 56CFATTACH_DECL_NEW(tegra_pmc, sizeof(struct tegra_pmc_softc), 57 tegra_pmc_match, tegra_pmc_attach, NULL, NULL); 58 59static int 60tegra_pmc_match(device_t parent, cfdata_t cf, void *aux) 61{ 62 return 1; 63} 64 65static void 66tegra_pmc_attach(device_t parent, device_t self, void *aux) 67{ 68 struct tegra_pmc_softc * const sc = device_private(self); 69 struct tegraio_attach_args * const tio = aux; 70 const struct tegra_locators * const loc = &tio->tio_loc; 71 72 sc->sc_dev = self; 73 sc->sc_bst = tio->tio_bst; 74 bus_space_subregion(tio->tio_bst, tio->tio_bsh, 75 loc->loc_offset, loc->loc_size, &sc->sc_bsh); 76 77 KASSERT(pmc_softc == NULL); 78 pmc_softc = sc; 79 80 aprint_naive("\n"); 81 aprint_normal(": PMC\n"); 82} 83 84static void 85tegra_pmc_get_bs(bus_space_tag_t *pbst, bus_space_handle_t *pbsh) 86{ 87 if (pmc_softc) { 88 *pbst = pmc_softc->sc_bst; 89 *pbsh = pmc_softc->sc_bsh; 90 } else { 91 *pbst = &armv7_generic_bs_tag; 92 bus_space_subregion(*pbst, tegra_apb_bsh, 93 TEGRA_PMC_OFFSET, TEGRA_PMC_SIZE, pbsh); 94 } 95} 96 97void 98tegra_pmc_reset(void) 99{ 100 bus_space_tag_t bst; 101 bus_space_handle_t bsh; 102 uint32_t cntrl; 103 104 tegra_pmc_get_bs(&bst, &bsh); 105 106 cntrl = bus_space_read_4(bst, bsh, PMC_CNTRL_0_REG); 107 cntrl |= PMC_CNTRL_0_MAIN_RST; 108 bus_space_write_4(bst, bsh, PMC_CNTRL_0_REG, cntrl); 109 110 for (;;) { 111 __asm("wfi"); 112 } 113} 114 115void 116tegra_pmc_power(u_int partid, bool enable) 117{ 118 bus_space_tag_t bst; 119 bus_space_handle_t bsh; 120 uint32_t status; 121 bool state; 122 123 tegra_pmc_get_bs(&bst, &bsh); 124 125 status = bus_space_read_4(bst, bsh, PMC_PWRGATE_STATUS_0_REG); 126 state = !!(status & __BIT(partid)); 127 if (state == enable) 128 return; 129 130 bus_space_write_4(bst, bsh, PMC_PWRGATE_TOGGLE_0_REG, 131 __SHIFTIN(partid, PMC_PWRGATE_TOGGLE_0_PARTID) | 132 PMC_PWRGATE_TOGGLE_0_START); 133} 134