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freebsd/sys/arm/lpc/lpc_machdep.c
Andrew Turner 27521ff8e4 Add the start of the ARM platform code. This is based on the PowerPC
platform code, it is expected these will be merged in the future when the
ARM code is more complete.

Until more boards can be tested only use this with the Raspberry Pi and
rrename the functions on the other SoCs.

Reviewed by:	ian@
2014-05-17 11:27:36 +00:00

141 lines
3.6 KiB
C

/*-
* Copyright (c) 1994-1998 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Brini.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BRINI ``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 BRINI 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.
*
* from: FreeBSD: //depot/projects/arm/src/sys/arm/at91/kb920x_machdep.c, rev 45
*/
#include "opt_ddb.h"
#include "opt_platform.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define _ARM32_BUS_DMA_PRIVATE
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <machine/devmap.h>
#include <machine/machdep.h>
#include <machine/platform.h>
#include <arm/lpc/lpcreg.h>
#include <arm/lpc/lpcvar.h>
#include <dev/fdt/fdt_common.h>
vm_offset_t
platform_lastaddr(void)
{
return (arm_devmap_lastaddr());
}
void
platform_probe_and_attach(void)
{
}
void
platform_gpio_init(void)
{
/*
* Set initial values of GPIO output ports
*/
lpc_gpio_init();
}
void
platform_late_init(void)
{
}
/*
* Add a single static device mapping.
* The values used were taken from the ranges property of the SoC node in the
* dts file when this code was converted to arm_devmap_add_entry().
*/
int
platform_devmap_init(void)
{
arm_devmap_add_entry(LPC_DEV_PHYS_BASE, LPC_DEV_SIZE);
return (0);
}
struct arm32_dma_range *
bus_dma_get_range(void)
{
return (NULL);
}
int
bus_dma_get_range_nb(void)
{
return (0);
}
void
cpu_reset(void)
{
bus_space_tag_t bst;
bus_space_handle_t bsh;
bst = fdtbus_bs_tag;
/* Enable WDT */
bus_space_map(bst, LPC_CLKPWR_PHYS_BASE, LPC_CLKPWR_SIZE, 0, &bsh);
bus_space_write_4(bst, bsh, LPC_CLKPWR_TIMCLK_CTRL,
LPC_CLKPWR_TIMCLK_CTRL_WATCHDOG);
bus_space_unmap(bst, bsh, LPC_CLKPWR_SIZE);
/* Instant assert of RESETOUT_N with pulse length 1ms */
bus_space_map(bst, LPC_WDTIM_PHYS_BASE, LPC_WDTIM_SIZE, 0, &bsh);
bus_space_write_4(bst, bsh, LPC_WDTIM_PULSE, 13000);
bus_space_write_4(bst, bsh, LPC_WDTIM_MCTRL, 0x70);
bus_space_unmap(bst, bsh, LPC_WDTIM_SIZE);
for (;;)
continue;
}