b41cdbed24
static device mappings, rather than as the first of the initializations that a platform can hook into. This allows a platform to allocate KVA from the top of the address space downwards for things like static device mapping, and return the final "last usable address" result after that and other early init work is done. Because some platforms were doing work in initarm_lastaddr() that needs to be done early, add a new initarm_early_init() routine and move the early init code to that routine on those platforms. Rename platform_devmap_init() to initarm_devmap_init() to match all the other init routines called from initarm() that are designed to be implemented by platform code. Add a comment block that explains when these routines are called and the type of work expected to be done in each of them.
190 lines
4.9 KiB
C
190 lines
4.9 KiB
C
/*-
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* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "opt_platform.h"
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define _ARM32_BUS_DMA_PRIVATE
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/reboot.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/armreg.h>
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#include <machine/bus.h>
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#include <machine/devmap.h>
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#include <machine/machdep.h>
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#include <arm/freescale/imx/imx_machdep.h>
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#include <arm/freescale/imx/imx_wdogreg.h>
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#define IMX_MAX_DEVMAP_ENTRIES 8
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static struct arm_devmap_entry devmap_entries[IMX_MAX_DEVMAP_ENTRIES];
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static u_int devmap_idx;
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static vm_offset_t devmap_vaddr = ARM_VECTORS_HIGH;
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void
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imx_devmap_addentry(vm_paddr_t pa, vm_size_t sz)
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{
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struct arm_devmap_entry *m;
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/*
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* The last table entry is the all-zeroes end-of-table marker. If we're
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* about to overwrite it the world is coming to an end. This code runs
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* too early for the panic to be printed unless a special early-debug
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* console is in use, but there's nothing else we can do.
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*/
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if (devmap_idx == (IMX_MAX_DEVMAP_ENTRIES - 1))
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panic("IMX_MAX_DEVMAP_ENTRIES is too small!\n");
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/*
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* Allocate virtual address space from the top of kva downwards. If the
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* range being mapped is aligned and sized to 1MB boundaries then also
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* align the virtual address to the next-lower 1MB boundary so that we
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* end up with a section mapping.
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*/
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if ((pa & 0x000fffff) == 0 && (sz & 0x000fffff) == 0) {
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devmap_vaddr = (devmap_vaddr - sz) & ~0x000fffff;
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} else {
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devmap_vaddr = (devmap_vaddr - sz) & ~0x00000fff;
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}
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m = &devmap_entries[devmap_idx++];
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m->pd_va = devmap_vaddr;
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m->pd_pa = pa;
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m->pd_size = sz;
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m->pd_prot = VM_PROT_READ | VM_PROT_WRITE;
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m->pd_cache = PTE_DEVICE;
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}
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vm_offset_t
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initarm_lastaddr(void)
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{
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return (devmap_vaddr);
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}
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void
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initarm_early_init(void)
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{
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/* XXX - Get rid of this stuff soon. */
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boothowto |= RB_VERBOSE|RB_MULTIPLE;
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bootverbose = 1;
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}
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int
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initarm_devmap_init(void)
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{
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imx_devmap_init();
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arm_devmap_register_table(devmap_entries);
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return (0);
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}
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/*
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* Set initial values of GPIO output ports
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*/
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void
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initarm_gpio_init(void)
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{
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}
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void
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initarm_late_init(void)
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{
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struct arm_devmap_entry *m;
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/*
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* We did the static devmap setup earlier, during initarm_lastaddr(),
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* but now the console should be working and we can be verbose about
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* what we did.
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*/
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if (bootverbose) {
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for (m = devmap_entries; m->pd_va != 0; ++m) {
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printf("Devmap: phys 0x%08x virt 0x%08x size %uK\n",
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m->pd_pa, m->pd_va, m->pd_size / 1024);
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}
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}
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}
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struct arm32_dma_range *
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bus_dma_get_range(void)
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{
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return (NULL);
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}
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int
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bus_dma_get_range_nb(void)
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{
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return (0);
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}
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/*
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* This code which manipulates the watchdog hardware is here to implement
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* cpu_reset() because the watchdog is the only way for software to reset the
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* chip. Why here and not in imx_wdog.c? Because there's no requirement that
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* the watchdog driver be compiled in, but it's nice to be able to reboot even
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* if it's not.
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*/
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void
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imx_wdog_cpu_reset(vm_offset_t wdcr_physaddr)
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{
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volatile uint16_t * pcr;
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/*
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* The deceptively simple write of WDOG_CR_WDE enables the watchdog,
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* sets the timeout to its minimum value (half a second), and also
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* clears the SRS bit which results in the SFTW (software-requested
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* reset) bit being set in the watchdog status register after the reset.
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* This is how software can distinguish a reset from a wdog timeout.
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*/
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if ((pcr = arm_devmap_ptov(wdcr_physaddr, sizeof(*pcr))) == NULL) {
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printf("cpu_reset() can't find its control register... locking up now.");
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} else {
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*pcr = WDOG_CR_WDE;
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}
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for (;;)
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continue;
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}
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u_int
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imx_soc_family(void)
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{
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return (imx_soc_type() >> IMXSOC_FAMSHIFT);
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}
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