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/* $NetBSD: riscv_platform.c,v 1.2 2023/06/12 19:04:13 skrll Exp $ */
/*-
* Copyright (c) 2023 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Nick Hudson
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* This is the default RISC-V FDT platform implementation. It assumes the
* following:
*
* - Console UART is pre-configured by firmware
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: riscv_platform.c,v 1.2 2023/06/12 19:04:13 skrll Exp $");
#include <sys/param.h>
#include <sys/bus.h>
#include <dev/fdt/fdtvar.h>
#include <uvm/uvm_extern.h>
#include <uvm/pmap/pmap_devmap.h>
#include <riscv/fdt/riscv_fdtvar.h>
static const struct pmap_devmap *
riscv_platform_devmap(void)
{
static const struct pmap_devmap devmap_empty[] = {
DEVMAP_ENTRY_END
};
static struct pmap_devmap devmap_uart[] = {
DEVMAP_ENTRY(VM_KERNEL_IO_BASE, 0, PAGE_SIZE),
DEVMAP_ENTRY_END
};
bus_addr_t uart_base;
const int phandle = fdtbus_get_stdout_phandle();
if (phandle <= 0)
return devmap_empty;
if (fdtbus_get_reg(phandle, 0, &uart_base, NULL) != 0)
return devmap_empty;
devmap_uart[0].pd_pa = DEVMAP_ALIGN(uart_base);
return devmap_uart;
}
static u_int
riscv_platform_uart_freq(void)
{
return 0;
}
static const struct fdt_platform riscv_platform = {
.fp_devmap = riscv_platform_devmap,
.fp_bootstrap = riscv_fdt_cpu_bootstrap,
.fp_uart_freq = riscv_platform_uart_freq,
.fp_mpstart = riscv_fdt_cpu_mpstart,
};
FDT_PLATFORM(rv, FDT_PLATFORM_DEFAULT, &riscv_platform);
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