tegra_pmc.c revision 1.6 
1/* $NetBSD: tegra_pmc.c,v 1.6 2015/05/25 10:40:23 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 1.6 2015/05/25 10:40:23 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, toggle;
121	bool state;
122	int retry = 10000;
123
124	tegra_pmc_get_bs(&bst, &bsh);
125
126	status = bus_space_read_4(bst, bsh, PMC_PWRGATE_STATUS_0_REG);
127	state = !!(status & __BIT(partid));
128	if (state == enable)
129		return;
130
131	while (--retry > 0) {
132		toggle = bus_space_read_4(bst, bsh, PMC_PWRGATE_TOGGLE_0_REG);
133		if ((toggle & PMC_PWRGATE_TOGGLE_0_START) == 0)
134			break;
135		delay(1);
136	}
137	if (retry == 0) {
138		printf("ERROR: Couldn't enable PMC partition %#x\n", partid);
139		return;
140	}
141
142	bus_space_write_4(bst, bsh, PMC_PWRGATE_TOGGLE_0_REG,
143	    __SHIFTIN(partid, PMC_PWRGATE_TOGGLE_0_PARTID) |
144	    PMC_PWRGATE_TOGGLE_0_START);
145}
146
147void
148tegra_pmc_remove_clamping(u_int partid)
149{
150	bus_space_tag_t bst;
151	bus_space_handle_t bsh;
152
153	tegra_pmc_get_bs(&bst, &bsh);
154
155	bus_space_write_4(bst, bsh, PMC_REMOVE_CLAMPING_CMD_0_REG,
156	    __BIT(partid));
157}
158
159void
160tegra_pmc_hdmi_enable(void)
161{
162	bus_space_tag_t bst;
163	bus_space_handle_t bsh;
164
165	tegra_pmc_get_bs(&bst, &bsh);
166
167	tegra_reg_set_clear(bst, bsh, PMC_IO_DPD_STATUS_REG,
168	    0, PMC_IO_DPD_STATUS_HDMI);
169	tegra_reg_set_clear(bst, bsh, PMC_IO_DPD2_STATUS_REG,
170	    0, PMC_IO_DPD2_STATUS_HV);
171}
172