bcm2835: push address mapping conversion for DMA/mailbox to runtime
We could maintain the static conversions for the !AArch64 Raspberry Pis, but I'm not sure it's worth it -- we'll traverse the platform list exactly once (of which there are only two for armv7), then every conversion there-after traverses the memory map listing of which there are at-most two entries for these boards: sdram and peripheral space. Detecting this at runtime is necessary for the AArch64 SOC, though, because of the distinct IO windows being otherwise not discernible just from support compiled into the kernel. We currently select the correct window based on /compatible in the FDT. We also use a similar mechanism to describe the DMA restrictions- the RPi 4 can have up to 4GB of RAM while the DMA controller and mailbox mechanism can technically, kind of, only access the lowest 1GB. See the comment in bcm2835_vcbus.h for a fun description/clarification of this. Differential Revision: https://reviews.freebsd.org/D22301
This commit is contained in:
Kyle Evans
parent
71353f7a2f
commit
40084ac37f
@ -169,7 +169,7 @@ bcm_dmamap_cb(void *arg, bus_dma_segment_t *segs,
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return;
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addr = (bus_addr_t*)arg;
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*addr = PHYS_TO_VCBUS(segs[0].ds_addr);
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*addr = ARMC_TO_VCBUS(segs[0].ds_addr);
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}
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static void
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@ -247,8 +247,12 @@ bcm_dma_init(device_t dev)
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if ((reg & bcm_dma_channel_mask) != 0)
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device_printf(dev, "statuses are not cleared\n");
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/* Allocate DMA chunks control blocks */
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/* p.40 of spec - control block should be 32-bit aligned */
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/*
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* Allocate DMA chunks control blocks based on p.40 of the peripheral
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* spec - control block should be 32-bit aligned. The DMA controller
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* has a full 32-bit register dedicated to this address, so we do not
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* need to bother with the per-SoC peripheral restrictions.
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*/
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err = bus_dma_tag_create(bus_get_dma_tag(dev),
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1, 0, BUS_SPACE_MAXADDR_32BIT,
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BUS_SPACE_MAXADDR, NULL, NULL,
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@ -561,14 +565,9 @@ bcm_dma_start(int ch, vm_paddr_t src, vm_paddr_t dst, int len)
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return (-1);
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cb = sc->sc_dma_ch[ch].cb;
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if (BCM2835_ARM_IS_IO(src))
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cb->src = IO_TO_VCBUS(src);
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else
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cb->src = PHYS_TO_VCBUS(src);
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if (BCM2835_ARM_IS_IO(dst))
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cb->dst = IO_TO_VCBUS(dst);
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else
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cb->dst = PHYS_TO_VCBUS(dst);
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cb->src = ARMC_TO_VCBUS(src);
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cb->dst = ARMC_TO_VCBUS(dst);
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cb->len = len;
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bus_dmamap_sync(sc->sc_dma_tag,
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@ -227,7 +227,7 @@ ft5406ts_init(void *arg)
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return;
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}
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touchbuf = VCBUS_TO_PHYS(msg.body.resp.address);
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touchbuf = VCBUS_TO_ARMC(msg.body.resp.address);
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sc->touch_buf = (uint8_t*)pmap_mapdev(touchbuf, FT5406_WINDOW_SIZE);
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/* 60Hz */
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@ -303,7 +303,7 @@ bcm2835_mbox_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
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if (err)
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return;
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addr = (bus_addr_t *)arg;
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*addr = PHYS_TO_VCBUS(segs[0].ds_addr);
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*addr = ARMC_TO_VCBUS(segs[0].ds_addr);
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}
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static void *
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@ -314,7 +314,7 @@ bcm2835_mbox_init_dma(device_t dev, size_t len, bus_dma_tag_t *tag,
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int err;
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err = bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
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BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
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bcm283x_dmabus_peripheral_lowaddr(), BUS_SPACE_MAXADDR, NULL, NULL,
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len, 1, len, 0, NULL, NULL, tag);
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if (err != 0) {
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device_printf(dev, "can't create DMA tag\n");
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@ -554,7 +554,7 @@ bcm2835_mbox_fb_init(struct bcm2835_fb_config *fb)
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fb->xoffset = msg.offset.body.resp.x;
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fb->yoffset = msg.offset.body.resp.y;
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fb->pitch = msg.pitch.body.resp.pitch;
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fb->base = VCBUS_TO_PHYS(msg.buffer.body.resp.fb_address);
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fb->base = VCBUS_TO_ARMC(msg.buffer.body.resp.fb_address);
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fb->size = msg.buffer.body.resp.fb_size;
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}
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@ -61,6 +61,7 @@ __FBSDID("$FreeBSD$");
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#ifdef NOTYET
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#include <arm/broadcom/bcm2835/bcm2835_clkman.h>
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#endif
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#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
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#define BCM2835_DEFAULT_SDHCI_FREQ 50
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#define BCM2838_DEFAULT_SDHCI_FREQ 100
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@ -330,7 +331,7 @@ bcm_sdhci_attach(device_t dev)
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/* Allocate bus_dma resources. */
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err = bus_dma_tag_create(bus_get_dma_tag(dev),
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1, 0, BUS_SPACE_MAXADDR_32BIT,
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1, 0, bcm283x_dmabus_peripheral_lowaddr(),
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BUS_SPACE_MAXADDR, NULL, NULL,
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BCM_DMA_MAXSIZE, ALLOCATED_DMA_SEGS, BCM_SDHCI_BUFFER_SIZE,
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BUS_DMA_ALLOCNOW, NULL, NULL,
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263
sys/arm/broadcom/bcm2835/bcm2835_vcbus.c
Normal file
263
sys/arm/broadcom/bcm2835/bcm2835_vcbus.c
Normal file
@ -0,0 +1,263 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019 Kyle Evans <kevans@FreeBSD.org>
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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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* This file contains facilities for runtime determination of address space
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* mappings for use in DMA/mailbox interactions. This is only used for the
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* arm64 SoC because the 32-bit SoC used the same mappings.
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*/
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#if defined (__aarch64__)
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#include "opt_soc.h"
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#endif
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <machine/bus.h>
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#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
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/*
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* This structure describes mappings that need to take place when transforming
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* ARM core addresses into vcbus addresses for use with the DMA/mailbox
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* interfaces. Currently, we only deal with peripheral/SDRAM address spaces
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* here.
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*
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* The SDRAM address space is consistently mapped starting at 0 and extends to
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* the size of the installed SDRAM.
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*
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* Peripherals are mapped further up at spots that vary per-SOC.
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*/
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struct bcm283x_memory_mapping {
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vm_paddr_t armc_start;
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vm_paddr_t armc_size;
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vm_paddr_t vcbus_start;
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};
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#if defined(SOC_BCM2835) || defined(SOC_BCM2836)
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static struct bcm283x_memory_mapping bcm2835_memmap[] = {
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{
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/* SDRAM */
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.armc_start = 0x00000000,
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.armc_size = BCM2835_ARM_IO_BASE,
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.vcbus_start = BCM2835_VCBUS_SDRAM_BASE,
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},
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{
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/* Peripherals */
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.armc_start = BCM2835_ARM_IO_BASE,
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.armc_size = BCM28XX_ARM_IO_SIZE,
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.vcbus_start = BCM2835_VCBUS_IO_BASE,
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},
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{ 0, 0, 0 },
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};
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#endif
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#ifdef SOC_BRCM_BCM2837
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static struct bcm283x_memory_mapping bcm2837_memmap[] = {
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{
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/* SDRAM */
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.armc_start = 0x00000000,
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.armc_size = BCM2837_ARM_IO_BASE,
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.vcbus_start = BCM2837_VCBUS_SDRAM_BASE,
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},
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{
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/* Peripherals */
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.armc_start = BCM2837_ARM_IO_BASE,
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.armc_size = BCM28XX_ARM_IO_SIZE,
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.vcbus_start = BCM2837_VCBUS_IO_BASE,
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},
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{ 0, 0, 0 },
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};
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#endif
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#ifdef SOC_BRCM_BCM2838
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/*
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* The BCM2838 supports up to 4GB of SDRAM, but unfortunately we can still only
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* map the first 1GB into the "legacy master view" (vcbus) address space. Thus,
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* peripherals can still only access the lower end of SDRAM. For this reason,
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* we also capture the main-peripheral busdma restriction below.
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*/
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static struct bcm283x_memory_mapping bcm2838_memmap[] = {
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{
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/* SDRAM */
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.armc_start = 0x00000000,
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.armc_size = 0x40000000,
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.vcbus_start = BCM2838_VCBUS_SDRAM_BASE,
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},
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{
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/* Main peripherals */
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.armc_start = BCM2838_ARM_IO_BASE,
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.armc_size = BCM28XX_ARM_IO_SIZE,
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.vcbus_start = BCM2838_VCBUS_IO_BASE,
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},
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{ 0, 0, 0 },
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};
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#endif
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static struct bcm283x_memory_soc_cfg {
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struct bcm283x_memory_mapping *memmap;
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const char *soc_compat;
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bus_addr_t busdma_lowaddr;
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} bcm283x_memory_configs[] = {
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#ifdef SOC_BCM2835
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{
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.memmap = bcm2835_memmap,
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.soc_compat = "brcm,bcm2835",
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.busdma_lowaddr = BUS_SPACE_MAXADDR_32BIT,
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},
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#endif
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#ifdef SOC_BCM2836
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{
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.memmap = bcm2835_memmap,
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.soc_compat = "brcm,bcm2836",
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.busdma_lowaddr = BUS_SPACE_MAXADDR_32BIT,
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},
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#endif
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#ifdef SOC_BRCM_BCM2837
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{
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.memmap = bcm2837_memmap,
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.soc_compat = "brcm,bcm2837",
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.busdma_lowaddr = BUS_SPACE_MAXADDR_32BIT,
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},
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#endif
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#ifdef SOC_BRCM_BCM2838
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{
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.memmap = bcm2838_memmap,
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.soc_compat = "brcm,bcm2838",
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.busdma_lowaddr = BCM2838_PERIPH_MAXADDR,
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},
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#endif
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};
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static struct bcm283x_memory_soc_cfg *booted_soc_memcfg;
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static struct bcm283x_memory_soc_cfg *
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bcm283x_get_current_memcfg(void)
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{
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phandle_t root;
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int i;
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/* We'll cache it once we decide, because it won't change per-boot. */
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if (booted_soc_memcfg != NULL)
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return (booted_soc_memcfg);
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KASSERT(nitems(bcm283x_memory_configs) != 0,
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("No SOC memory configurations enabled!"));
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root = OF_finddevice("/");
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for (i = 0; i < nitems(bcm283x_memory_configs); ++i) {
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booted_soc_memcfg = &bcm283x_memory_configs[i];
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printf("Checking root against %s\n",
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booted_soc_memcfg->soc_compat);
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if (ofw_bus_node_is_compatible(root,
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booted_soc_memcfg->soc_compat))
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return (booted_soc_memcfg);
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}
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/*
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* The kernel doesn't fit the board; we can't really make a reasonable
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* guess, as these SOC are different enough that something will blow up
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* later.
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*/
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panic("No suitable SOC memory configuration found.");
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}
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#define BCM283X_MEMMAP_ISTERM(ent) \
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((ent)->armc_start == 0 && (ent)->armc_size == 0 && \
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(ent)->vcbus_start == 0)
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vm_paddr_t
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bcm283x_armc_to_vcbus(vm_paddr_t pa)
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{
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struct bcm283x_memory_soc_cfg *cfg;
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struct bcm283x_memory_mapping *map, *ment;
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/* Guaranteed not NULL if we haven't panicked yet. */
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cfg = bcm283x_get_current_memcfg();
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map = cfg->memmap;
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for (ment = map; !BCM283X_MEMMAP_ISTERM(ment); ++ment) {
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if (pa >= ment->armc_start &&
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pa < ment->armc_start + ment->armc_size) {
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return (pa - ment->armc_start) + ment->vcbus_start;
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}
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}
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/*
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* Assume 1:1 mapping for anything else, but complain about it on
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* verbose boots.
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*/
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if (bootverbose)
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printf("bcm283x_vcbus: No armc -> vcbus mapping found: %jx\n",
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(uintmax_t)pa);
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return (pa);
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}
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vm_paddr_t
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bcm283x_vcbus_to_armc(vm_paddr_t vca)
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{
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struct bcm283x_memory_soc_cfg *cfg;
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struct bcm283x_memory_mapping *map, *ment;
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/* Guaranteed not NULL if we haven't panicked yet. */
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cfg = bcm283x_get_current_memcfg();
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map = cfg->memmap;
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for (ment = map; !BCM283X_MEMMAP_ISTERM(ment); ++ment) {
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if (vca >= ment->vcbus_start &&
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vca < ment->vcbus_start + ment->armc_size) {
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return (vca - ment->vcbus_start) + ment->armc_start;
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}
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}
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/*
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* Assume 1:1 mapping for anything else, but complain about it on
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* verbose boots.
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*/
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if (bootverbose)
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printf("bcm283x_vcbus: No vcbus -> armc mapping found: %jx\n",
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(uintmax_t)vca);
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return (vca);
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}
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bus_addr_t
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bcm283x_dmabus_peripheral_lowaddr(void)
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{
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struct bcm283x_memory_soc_cfg *cfg;
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cfg = bcm283x_get_current_memcfg();
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return (cfg->busdma_lowaddr);
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}
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@ -35,47 +35,40 @@
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#ifndef _BCM2835_VCBUS_H_
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#define _BCM2835_VCBUS_H_
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/*
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* ARM64 define its SOC options in opt_soc.h
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*/
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#if defined(__aarch64__)
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#include "opt_soc.h"
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#endif
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#define BCM2835_VCBUS_SDRAM_CACHED 0x40000000
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#define BCM2835_VCBUS_IO_BASE 0x7E000000
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#define BCM2835_VCBUS_SDRAM_UNCACHED 0xC0000000
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#if defined(SOC_BCM2835)
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#define BCM2835_ARM_IO_BASE 0x20000000
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#define BCM2835_VCBUS_IO_BASE 0x7E000000
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#define BCM2835_VCBUS_SDRAM_BASE BCM2835_VCBUS_SDRAM_CACHED
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#else
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#define BCM2835_ARM_IO_BASE 0x3f000000
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#define BCM2835_VCBUS_SDRAM_BASE BCM2835_VCBUS_SDRAM_UNCACHED
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#endif
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#define BCM2835_ARM_IO_SIZE 0x01000000
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#define BCM2837_ARM_IO_BASE 0x3f000000
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#define BCM2837_VCBUS_IO_BASE BCM2835_VCBUS_IO_BASE
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#define BCM2837_VCBUS_SDRAM_BASE BCM2835_VCBUS_SDRAM_UNCACHED
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#define BCM2838_ARM_IO_BASE 0xfe000000
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#define BCM2838_VCBUS_IO_BASE BCM2835_VCBUS_IO_BASE
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#define BCM2838_VCBUS_SDRAM_BASE BCM2835_VCBUS_SDRAM_UNCACHED
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/*
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* Convert physical address to VC bus address. Should be used
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* when submitting address over mailbox interface
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* Max allowed SDRAM mapping for most peripherals. The Raspberry Pi 4 has more
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* than 1 GB of SDRAM, but only the lowest 1 GB is mapped into the "Legacy
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* Master view" of the address space accessible by the DMA engine. Technically,
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* we can slide this window around to whatever similarly sized range is
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* convenient, but this is the most useful window given how busdma(9) works and
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* that the window must be reconfigured for all channels in a given DMA engine.
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* The DMA lite engine's window can be configured separately from the 30-bit DMA
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* engine.
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*/
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#define PHYS_TO_VCBUS(pa) ((pa) + BCM2835_VCBUS_SDRAM_BASE)
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#define BCM2838_PERIPH_MAXADDR 0x3fffffff
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/* Check whether pa bellong top IO window */
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#define BCM2835_ARM_IS_IO(pa) (((pa) >= BCM2835_ARM_IO_BASE) && \
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((pa) < BCM2835_ARM_IO_BASE + BCM2835_ARM_IO_SIZE))
|
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#define BCM28XX_ARM_IO_SIZE 0x01000000
|
||||
|
||||
/*
|
||||
* Convert physical address in IO space to VC bus address.
|
||||
*/
|
||||
#define IO_TO_VCBUS(pa) ((pa - BCM2835_ARM_IO_BASE) + \
|
||||
BCM2835_VCBUS_IO_BASE)
|
||||
vm_paddr_t bcm283x_armc_to_vcbus(vm_paddr_t pa);
|
||||
vm_paddr_t bcm283x_vcbus_to_armc(vm_paddr_t vca);
|
||||
bus_addr_t bcm283x_dmabus_peripheral_lowaddr(void);
|
||||
|
||||
/*
|
||||
* Convert address from VC bus space to physical. Should be used
|
||||
* when address is returned by VC over mailbox interface. e.g.
|
||||
* framebuffer base
|
||||
*/
|
||||
#define VCBUS_TO_PHYS(vca) ((vca) & ~(BCM2835_VCBUS_SDRAM_BASE))
|
||||
#define ARMC_TO_VCBUS(pa) bcm283x_armc_to_vcbus(pa)
|
||||
#define VCBUS_TO_ARMC(vca) bcm283x_vcbus_to_armc(vca)
|
||||
|
||||
#endif /* _BCM2835_VCBUS_H_ */
|
||||
|
||||
@ -14,6 +14,7 @@ arm/broadcom/bcm2835/bcm2835_rng.c optional random
|
||||
arm/broadcom/bcm2835/bcm2835_sdhci.c optional sdhci
|
||||
arm/broadcom/bcm2835/bcm2835_sdhost.c optional sdhci
|
||||
arm/broadcom/bcm2835/bcm2835_spi.c optional bcm2835_spi
|
||||
arm/broadcom/bcm2835/bcm2835_vcbus.c standard
|
||||
arm/broadcom/bcm2835/bcm2835_vcio.c standard
|
||||
arm/broadcom/bcm2835/bcm2835_wdog.c standard
|
||||
arm/broadcom/bcm2835/bcm283x_dwc_fdt.c optional dwcotg fdt
|
||||
|
||||
@ -101,6 +101,7 @@ arm/broadcom/bcm2835/bcm2835_rng.c optional !random_loadable soc_brcm_bcm2837 f
|
||||
arm/broadcom/bcm2835/bcm2835_sdhci.c optional sdhci soc_brcm_bcm2837 fdt | sdhci soc_brcm_bcm2838 fdt
|
||||
arm/broadcom/bcm2835/bcm2835_sdhost.c optional sdhci soc_brcm_bcm2837 fdt | sdhci soc_brcm_bcm2838 fdt
|
||||
arm/broadcom/bcm2835/bcm2835_spi.c optional bcm2835_spi fdt
|
||||
arm/broadcom/bcm2835/bcm2835_vcbus.c optional soc_brcm_bcm2837 fdt | soc_brcm_bcm2838 fdt
|
||||
arm/broadcom/bcm2835/bcm2835_vcio.c optional soc_brcm_bcm2837 fdt | soc_brcm_bcm2838 fdt
|
||||
arm/broadcom/bcm2835/bcm2835_wdog.c optional soc_brcm_bcm2837 fdt | soc_brcm_bcm2838 fdt
|
||||
arm/broadcom/bcm2835/bcm2836.c optional soc_brcm_bcm2837 fdt | soc_brcm_bcm2838 fdt
|
||||
|
||||
Loading…
Reference in New Issue
Block a user