freebsd-skq/sys/arm/freescale/imx/imx6_machdep.c
ian 64750d8ea3 Begin reducing code duplication in arm pmap.c and pmap-v6.c by factoring
out common code related to mapping device memory into a new devmap.c file.

Remove the growing duplication of code that used pmap_devmap_find_pa() and
then did some math with the returned results to generate a virtual address,
and likewise in reverse to get a physical address.  Now there are a pair
of functions, arm_devmap_vtop() and arm_devmap_ptov(), to do that.  The
bus_space_map() implementations are rewritten in terms of these.
2013-11-04 19:44:37 +00:00

165 lines
5.5 KiB
C

/*-
* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "opt_platform.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/reboot.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/devmap.h>
#include <arm/freescale/imx/imx6_anatopreg.h>
#include <arm/freescale/imx/imx6_anatopvar.h>
#include <arm/freescale/imx/imx_machdep.h>
/*
* Set up static device mappings. Note that for imx this is called from
* initarm_lastaddr() so that it can return the lowest address used for static
* device mapping, maximizing kva space.
*
* This attempts to cover the most-used devices with 1MB section mappings, which
* is good for performance (uses fewer TLB entries for device access).
*
* ARMMP covers the interrupt controller, MPCore timers, global timer, and the
* L2 cache controller. Most of the 1MB range is unused reserved space.
*
* AIPS1/AIPS2 cover most of the on-chip devices such as uart, spi, i2c, etc.
*
* Notably not mapped right now are HDMI, GPU, and other devices below ARMMP in
* the memory map. When we get support for graphics it might make sense to
* static map some of that area. Be careful with other things in that area such
* as OCRAM that probably shouldn't be mapped as PTE_DEVICE memory.
*/
void
imx_devmap_init(void)
{
const uint32_t IMX6_ARMMP_PHYS = 0x00a00000;
const uint32_t IMX6_ARMMP_SIZE = 0x00100000;
const uint32_t IMX6_AIPS1_PHYS = 0x02000000;
const uint32_t IMX6_AIPS1_SIZE = 0x00100000;
const uint32_t IMX6_AIPS2_PHYS = 0x02100000;
const uint32_t IMX6_AIPS2_SIZE = 0x00100000;
imx_devmap_addentry(IMX6_ARMMP_PHYS, IMX6_ARMMP_SIZE);
imx_devmap_addentry(IMX6_AIPS1_PHYS, IMX6_AIPS1_SIZE);
imx_devmap_addentry(IMX6_AIPS2_PHYS, IMX6_AIPS2_SIZE);
}
void
cpu_reset(void)
{
const uint32_t IMX6_WDOG_CR_PHYS = 0x020bc000;
imx_wdog_cpu_reset(IMX6_WDOG_CR_PHYS);
}
/*
* Determine what flavor of imx6 we're running on.
*
* This code is based on the way u-boot does it. Information found on the web
* indicates that Freescale themselves were the original source of this logic,
* including the strange check for number of CPUs in the SCU configuration
* register, which is apparently needed on some revisions of the SOLO.
*
* According to the documentation, there is such a thing as an i.MX6 Dual
* (non-lite flavor). However, Freescale doesn't seem to have assigned it a
* number or provided any logic to handle it in their detection code.
*
* Note that the ANALOG_DIGPROG and SCU configuration registers are not
* documented in the chip reference manual. (SCU configuration is mentioned,
* but not mapped out in detail.) I think the bottom two bits of the scu config
* register may be ncpu-1.
*
* This hasn't been tested yet on a dual[-lite].
*
* On a solo:
* digprog = 0x00610001
* hwsoc = 0x00000062
* scu config = 0x00000500
* On a quad:
* digprog = 0x00630002
* hwsoc = 0x00000063
* scu config = 0x00005503
*/
u_int imx_soc_type()
{
uint32_t digprog, hwsoc;
uint32_t *pcr;
const uint32_t HWSOC_MX6SL = 0x60;
const uint32_t HWSOC_MX6DL = 0x61;
const uint32_t HWSOC_MX6SOLO = 0x62;
const uint32_t HWSOC_MX6Q = 0x63;
const vm_offset_t SCU_CONFIG_PHYSADDR = 0x00a00004;
digprog = imx6_anatop_read_4(IMX6_ANALOG_DIGPROG_SL);
hwsoc = (digprog >> IMX6_ANALOG_DIGPROG_SOCTYPE_SHIFT) &
IMX6_ANALOG_DIGPROG_SOCTYPE_MASK;
if (hwsoc != HWSOC_MX6SL) {
digprog = imx6_anatop_read_4(IMX6_ANALOG_DIGPROG);
hwsoc = (digprog & IMX6_ANALOG_DIGPROG_SOCTYPE_MASK) >>
IMX6_ANALOG_DIGPROG_SOCTYPE_SHIFT;
/*printf("digprog = 0x%08x\n", digprog);*/
if (hwsoc == HWSOC_MX6DL) {
pcr = arm_devmap_ptov(SCU_CONFIG_PHYSADDR, 4);
if (pcr != NULL) {
/*printf("scu config = 0x%08x\n", *pcr);*/
if ((*pcr & 0x03) == 0) {
hwsoc = HWSOC_MX6SOLO;
}
}
}
}
/* printf("hwsoc 0x%08x\n", hwsoc); */
switch (hwsoc) {
case HWSOC_MX6SL:
return (IMXSOC_6SL);
case HWSOC_MX6SOLO:
return (IMXSOC_6S);
case HWSOC_MX6DL:
return (IMXSOC_6DL);
case HWSOC_MX6Q :
return (IMXSOC_6Q);
default:
printf("imx_soc_type: Don't understand hwsoc 0x%02x, "
"digprog 0x%08x; assuming IMXSOC_6Q\n", hwsoc, digprog);
break;
}
return (IMXSOC_6Q);
}