imx6_machdep.c revision 259355 
1/*-
2 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include "opt_platform.h"
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/10/sys/arm/freescale/imx/imx6_machdep.c 259355 2013-12-13 22:41:57Z ian $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/bus.h>
35#include <sys/reboot.h>
36
37#include <machine/bus.h>
38#include <vm/vm.h>
39#include <vm/pmap.h>
40#include <arm/freescale/imx/imx6_anatopreg.h>
41#include <arm/freescale/imx/imx6_anatopvar.h>
42#include <arm/freescale/imx/imx_machdep.h>
43
44/*
45 * Set up static device mappings.  Note that for imx this is called from
46 * initarm_lastaddr() so that it can return the lowest address used for static
47 * device mapping, maximizing kva space.
48 *
49 * This attempts to cover the most-used devices with 1MB section mappings, which
50 * is good for performance (uses fewer TLB entries for device access).
51 *
52 * ARMMP covers the interrupt controller, MPCore timers, global timer, and the
53 * L2 cache controller.  Most of the 1MB range is unused reserved space.
54 *
55 * AIPS1/AIPS2 cover most of the on-chip devices such as uart, spi, i2c, etc.
56 *
57 * Notably not mapped right now are HDMI, GPU, and other devices below ARMMP in
58 * the memory map.  When we get support for graphics it might make sense to
59 * static map some of that area.  Be careful with other things in that area such
60 * as OCRAM that probably shouldn't be mapped as PTE_DEVICE memory.
61 */
62void
63imx_devmap_init(void)
64{
65	const uint32_t IMX6_ARMMP_PHYS = 0x00a00000;
66	const uint32_t IMX6_ARMMP_SIZE = 0x00100000;
67	const uint32_t IMX6_AIPS1_PHYS = 0x02000000;
68	const uint32_t IMX6_AIPS1_SIZE = 0x00100000;
69	const uint32_t IMX6_AIPS2_PHYS = 0x02100000;
70	const uint32_t IMX6_AIPS2_SIZE = 0x00100000;
71
72	imx_devmap_addentry(IMX6_ARMMP_PHYS, IMX6_ARMMP_SIZE);
73	imx_devmap_addentry(IMX6_AIPS1_PHYS, IMX6_AIPS1_SIZE);
74	imx_devmap_addentry(IMX6_AIPS2_PHYS, IMX6_AIPS2_SIZE);
75}
76
77void
78cpu_reset(void)
79{
80	const uint32_t IMX6_WDOG_CR_PHYS = 0x020bc000;
81
82	imx_wdog_cpu_reset(IMX6_WDOG_CR_PHYS);
83}
84
85/*
86 * Determine what flavor of imx6 we're running on.
87 *
88 * This code is based on the way u-boot does it.  Information found on the web
89 * indicates that Freescale themselves were the original source of this logic,
90 * including the strange check for number of CPUs in the SCU configuration
91 * register, which is apparently needed on some revisions of the SOLO.
92 *
93 * According to the documentation, there is such a thing as an i.MX6 Dual
94 * (non-lite flavor).  However, Freescale doesn't seem to have assigned it a
95 * number or provided any logic to handle it in their detection code.
96 *
97 * Note that the ANALOG_DIGPROG and SCU configuration registers are not
98 * documented in the chip reference manual.  (SCU configuration is mentioned,
99 * but not mapped out in detail.)  I think the bottom two bits of the scu config
100 * register may be ncpu-1.
101 *
102 * This hasn't been tested yet on a dual[-lite].
103 *
104 * On a solo:
105 *      digprog    = 0x00610001
106 *      hwsoc      = 0x00000062
107 *      scu config = 0x00000500
108 * On a quad:
109 *      digprog    = 0x00630002
110 *      hwsoc      = 0x00000063
111 *      scu config = 0x00005503
112 */
113u_int imx_soc_type()
114{
115	const struct pmap_devmap *pd;
116	uint32_t digprog, hwsoc;
117	uint32_t *pcr;
118	const uint32_t HWSOC_MX6SL   = 0x60;
119	const uint32_t HWSOC_MX6DL   = 0x61;
120	const uint32_t HWSOC_MX6SOLO = 0x62;
121	const uint32_t HWSOC_MX6Q    = 0x63;
122	const vm_offset_t SCU_CONFIG_PHYSADDR = 0x00a00004;
123
124	digprog = imx6_anatop_read_4(IMX6_ANALOG_DIGPROG_SL);
125	hwsoc = (digprog >> IMX6_ANALOG_DIGPROG_SOCTYPE_SHIFT) &
126	    IMX6_ANALOG_DIGPROG_SOCTYPE_MASK;
127
128	if (hwsoc != HWSOC_MX6SL) {
129		digprog = imx6_anatop_read_4(IMX6_ANALOG_DIGPROG);
130		hwsoc = (digprog & IMX6_ANALOG_DIGPROG_SOCTYPE_MASK) >>
131		    IMX6_ANALOG_DIGPROG_SOCTYPE_SHIFT;
132		/*printf("digprog = 0x%08x\n", digprog);*/
133		if (hwsoc == HWSOC_MX6DL) {
134			pd = pmap_devmap_find_pa(SCU_CONFIG_PHYSADDR, 4);
135			if (pd != NULL) {
136				pcr = (uint32_t *)(pd->pd_va +
137				    (SCU_CONFIG_PHYSADDR - pd->pd_pa));
138				/*printf("scu config = 0x%08x\n", *pcr);*/
139				if ((*pcr & 0x03) == 0) {
140					hwsoc = HWSOC_MX6SOLO;
141				}
142			}
143		}
144	}
145	/* printf("hwsoc 0x%08x\n", hwsoc); */
146
147	switch (hwsoc) {
148	case HWSOC_MX6SL:
149		return (IMXSOC_6SL);
150	case HWSOC_MX6SOLO:
151		return (IMXSOC_6S);
152	case HWSOC_MX6DL:
153		return (IMXSOC_6DL);
154	case HWSOC_MX6Q :
155		return (IMXSOC_6Q);
156	default:
157		printf("imx_soc_type: Don't understand hwsoc 0x%02x, "
158		    "digprog 0x%08x; assuming IMXSOC_6Q\n", hwsoc, digprog);
159		break;
160	}
161
162	return (IMXSOC_6Q);
163}
164
165