diff options
author | gonzo <gonzo@FreeBSD.org> | 2013-02-28 19:48:19 +0000 |
---|---|---|
committer | gonzo <gonzo@FreeBSD.org> | 2013-02-28 19:48:19 +0000 |
commit | 80b147459e115635bcd4e433faf50effc6910a03 (patch) | |
tree | 85216092b2659043ecc0f093bad9654f45456c9c /sys/arm | |
parent | 9b1d7b3ae47bf2aa81c07ad2179ef27132327f2a (diff) | |
download | FreeBSD-src-80b147459e115635bcd4e433faf50effc6910a03.zip FreeBSD-src-80b147459e115635bcd4e433faf50effc6910a03.tar.gz |
Add driver for BCM2835's DMA engine
This is a version of code submitted by Daisuke Aoyama <aoyama at peach.ne.jp>
with some architectural changes.
Diffstat (limited to 'sys/arm')
-rw-r--r-- | sys/arm/broadcom/bcm2835/bcm2835_dma.c | 727 | ||||
-rw-r--r-- | sys/arm/broadcom/bcm2835/bcm2835_dma.h | 62 | ||||
-rw-r--r-- | sys/arm/broadcom/bcm2835/files.bcm2835 | 1 |
3 files changed, 790 insertions, 0 deletions
diff --git a/sys/arm/broadcom/bcm2835/bcm2835_dma.c b/sys/arm/broadcom/bcm2835/bcm2835_dma.c new file mode 100644 index 0000000..5e1c9dc --- /dev/null +++ b/sys/arm/broadcom/bcm2835/bcm2835_dma.c @@ -0,0 +1,727 @@ +/* + * Copyright (c) 2013 Daisuke Aoyama <aoyama@peach.ne.jp> + * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@bluezbox.com> + * + * 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 <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/module.h> +#include <sys/mutex.h> +#include <sys/queue.h> +#include <sys/resource.h> +#include <sys/rman.h> + +#include <dev/fdt/fdt_common.h> +#include <dev/ofw/openfirm.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <vm/vm.h> +#include <vm/pmap.h> +#include <machine/bus.h> +#include <machine/cpu.h> +#include <machine/cpufunc.h> +#include <machine/pmap.h> + +#include "bcm2835_dma.h" +#include "bcm2835_vcbus.h" + +#define MAX_REG 9 + +/* private flags */ +#define BCM_DMA_CH_USED 0x00000001 +#define BCM_DMA_CH_FREE 0x40000000 +#define BCM_DMA_CH_UNMAP 0x80000000 + +/* Register Map (4.2.1.2) */ +#define BCM_DMA_CS(n) (0x100*(n) + 0x00) +#define CS_ACTIVE (1 << 0) +#define CS_END (1 << 1) +#define CS_INT (1 << 2) +#define CS_DREQ (1 << 3) +#define CS_ISPAUSED (1 << 4) +#define CS_ISHELD (1 << 5) +#define CS_ISWAIT (1 << 6) +#define CS_ERR (1 << 8) +#define CS_WAITWRT (1 << 28) +#define CS_DISDBG (1 << 29) +#define CS_ABORT (1 << 30) +#define CS_RESET (1 << 31) +#define BCM_DMA_CBADDR(n) (0x100*(n) + 0x04) +#define BCM_DMA_INFO(n) (0x100*(n) + 0x08) +#define INFO_INT_EN (1 << 0) +#define INFO_TDMODE (1 << 1) +#define INFO_WAIT_RESP (1 << 3) +#define INFO_D_INC (1 << 4) +#define INFO_D_WIDTH (1 << 5) +#define INFO_D_DREQ (1 << 6) +#define INFO_S_INC (1 << 8) +#define INFO_S_WIDTH (1 << 9) +#define INFO_S_DREQ (1 << 10) +#define INFO_WAITS_SHIFT (21) +#define INFO_PERMAP_SHIFT (16) +#define INFO_PERMAP_MASK (0x1f << INFO_PERMAP_SHIFT) + +#define BCM_DMA_SRC(n) (0x100*(n) + 0x0C) +#define BCM_DMA_DST(n) (0x100*(n) + 0x10) +#define BCM_DMA_LEN(n) (0x100*(n) + 0x14) +#define BCM_DMA_STRIDE(n) (0x100*(n) + 0x18) +#define BCM_DMA_CBNEXT(n) (0x100*(n) + 0x1C) +#define BCM_DMA_DEBUG(n) (0x100*(n) + 0x20) +#define DEBUG_ERROR_MASK (7) + +#define BCM_DMA_INT_STATUS 0xfe0 +#define BCM_DMA_ENABLE 0xff0 + +/* relative offset from BCM_VC_DMA0_BASE (p.39) */ +#define BCM_DMA_CH(n) (0x100*(n)) + +/* DMA Control Block - 256bit aligned (p.40) */ +struct bcm_dma_cb { + uint32_t info; /* Transfer Information */ + uint32_t src; /* Source Address */ + uint32_t dst; /* Destination Address */ + uint32_t len; /* Transfer Length */ + uint32_t stride; /* 2D Mode Stride */ + uint32_t next; /* Next Control Block Address */ + uint32_t rsvd1; /* Reserved */ + uint32_t rsvd2; /* Reserved */ +}; + +#ifdef DEBUG +static void bcm_dma_cb_dump(struct bcm_dma_cb *cb); +static void bcm_dma_reg_dump(int ch); +#endif + +/* DMA channel private info */ +struct bcm_dma_ch { + int ch; + uint32_t flags; + struct bcm_dma_cb * cb; + uint32_t vc_cb; + bus_dmamap_t dma_map; + void (*intr_func)(int, void *); + void * intr_arg; +}; + +struct bcm_dma_softc { + device_t sc_dev; + struct mtx sc_mtx; + struct resource * sc_mem; + struct resource * sc_irq[BCM_DMA_CH_MAX]; + void * sc_intrhand[BCM_DMA_CH_MAX]; + struct bcm_dma_ch sc_dma_ch[BCM_DMA_CH_MAX]; + bus_dma_tag_t sc_dma_tag; +}; + +static struct bcm_dma_softc *bcm_dma_sc = NULL; + +static void +bcm_dmamap_cb(void *arg, bus_dma_segment_t *segs, + int nseg, int err) +{ + bus_addr_t *addr; + + if (err) + return; + + addr = (bus_addr_t*)arg; + *addr = PHYS_TO_VCBUS(segs[0].ds_addr); +} + +static void +bcm_dma_reset(device_t dev, int ch) +{ + struct bcm_dma_softc *sc = device_get_softc(dev); + struct bcm_dma_cb *cb; + uint32_t cs; + int count; + + if (ch < 0 || ch >= BCM_DMA_CH_MAX) + return; + + cs = bus_read_4(sc->sc_mem, BCM_DMA_CS(ch)); + + if (cs & CS_ACTIVE) { + /* pause current task */ + bus_write_4(sc->sc_mem, BCM_DMA_CS(ch), 0); + + count = 1000; + do { + cs = bus_read_4(sc->sc_mem, BCM_DMA_CS(ch)); + } while (!(cs & CS_ISPAUSED) && (count-- > 0)); + + if (!(cs & CS_ISPAUSED)) { + device_printf(dev, + "Can't abort DMA transfer at channel %d\n", ch); + } + + bus_write_4(sc->sc_mem, BCM_DMA_CBNEXT(ch), 0); + + /* Complete everything, clear interrupt */ + bus_write_4(sc->sc_mem, BCM_DMA_CS(ch), + CS_ABORT | CS_INT | CS_END| CS_ACTIVE); + } + + /* clear control blocks */ + bus_write_4(sc->sc_mem, BCM_DMA_CBADDR(ch), 0); + bus_write_4(sc->sc_mem, BCM_DMA_CBNEXT(ch), 0); + + /* Reset control block */ + cb = sc->sc_dma_ch[ch].cb; + bzero(cb, sizeof(cb)); +} + +static int +bcm_dma_init(device_t dev) +{ + struct bcm_dma_softc *sc = device_get_softc(dev); + uint32_t mask; + struct bcm_dma_ch *ch; + void *cb_virt; + vm_paddr_t cb_phys; + int err; + int i; + + /* disable and clear interrupt status */ + bus_write_4(sc->sc_mem, BCM_DMA_ENABLE, 0); + bus_write_4(sc->sc_mem, BCM_DMA_INT_STATUS, 0); + + /* Allocate DMA chunks control blocks */ + /* p.40 of spec - control block should be 32-bit aligned */ + err = bus_dma_tag_create(bus_get_dma_tag(dev), + 1, 0, BUS_SPACE_MAXADDR_32BIT, + BUS_SPACE_MAXADDR, NULL, NULL, + sizeof(struct bcm_dma_cb), 1, + sizeof(struct bcm_dma_cb), + BUS_DMA_ALLOCNOW, NULL, NULL, + &sc->sc_dma_tag); + + if (err) { + device_printf(dev, "failed allocate DMA tag"); + return (err); + } + + /* setup initial settings */ + for (i = 0; i < BCM_DMA_CH_MAX; i++) { + ch = &sc->sc_dma_ch[i]; + + err = bus_dmamem_alloc(sc->sc_dma_tag, &cb_virt, + BUS_DMA_WAITOK | BUS_DMA_COHERENT | BUS_DMA_ZERO, + &ch->dma_map); + if (err) { + device_printf(dev, "cannot allocate DMA memory\n"); + break; + } + + /* + * Least alignment for busdma-allocated stuff is cache + * line size, so just make sure nothing stupid happend + * and we got properly aligned address + */ + if ((uintptr_t)cb_virt & 0x1f) { + device_printf(dev, + "DMA address is not 32-bytes aligned: %p\n", + (void*)cb_virt); + break; + } + + err = bus_dmamap_load(sc->sc_dma_tag, ch->dma_map, cb_virt, + sizeof(struct bcm_dma_cb), bcm_dmamap_cb, &cb_phys, + BUS_DMA_WAITOK); + if (err) { + device_printf(dev, "cannot load DMA memory\n"); + break; + } + + bzero(ch, sizeof(struct bcm_dma_ch)); + ch->ch = i; + ch->cb = cb_virt; + ch->vc_cb = cb_phys; + ch->intr_func = NULL; + ch->intr_arg = NULL; + ch->flags = BCM_DMA_CH_UNMAP; + + ch->cb->info = INFO_WAIT_RESP; + + /* reset DMA engine */ + bcm_dma_reset(dev, i); + } + + /* now use DMA2/DMA3 only */ + sc->sc_dma_ch[2].flags = BCM_DMA_CH_FREE; + sc->sc_dma_ch[3].flags = BCM_DMA_CH_FREE; + + /* enable DMAs */ + mask = 0; + + for (i = 0; i < BCM_DMA_CH_MAX; i++) + if (sc->sc_dma_ch[i].flags & BCM_DMA_CH_FREE) + mask |= (1 << i); + + bus_write_4(sc->sc_mem, BCM_DMA_ENABLE, mask); + + return (0); +} + +/* + * Allocate DMA channel for further use, returns channel # or + * BCM_DMA_CH_INVALID + */ +int +bcm_dma_allocate(int req_ch) +{ + struct bcm_dma_softc *sc = bcm_dma_sc; + int ch = BCM_DMA_CH_INVALID; + int i; + + if (req_ch >= BCM_DMA_CH_MAX) + return (BCM_DMA_CH_INVALID); + + /* Auto(req_ch < 0) or CH specified */ + mtx_lock(&sc->sc_mtx); + + if (req_ch < 0) { + for (i = 0; i < BCM_DMA_CH_MAX; i++) { + if (sc->sc_dma_ch[i].flags & BCM_DMA_CH_FREE) { + ch = i; + sc->sc_dma_ch[ch].flags &= ~BCM_DMA_CH_FREE; + sc->sc_dma_ch[ch].flags |= BCM_DMA_CH_USED; + break; + } + } + } + else { + if (sc->sc_dma_ch[req_ch].flags & BCM_DMA_CH_FREE) { + ch = req_ch; + sc->sc_dma_ch[ch].flags &= ~BCM_DMA_CH_FREE; + sc->sc_dma_ch[ch].flags |= BCM_DMA_CH_USED; + } + } + + mtx_unlock(&sc->sc_mtx); + return (ch); +} + +/* + * Frees allocated channel. Returns 0 on success, -1 otherwise + */ +int +bcm_dma_free(int ch) +{ + struct bcm_dma_softc *sc = bcm_dma_sc; + + if (ch < 0 || ch >= BCM_DMA_CH_MAX) + return (-1); + + mtx_lock(&sc->sc_mtx); + if (sc->sc_dma_ch[ch].flags & BCM_DMA_CH_USED) { + sc->sc_dma_ch[ch].flags |= BCM_DMA_CH_FREE; + sc->sc_dma_ch[ch].flags &= ~BCM_DMA_CH_USED; + sc->sc_dma_ch[ch].intr_func = NULL; + sc->sc_dma_ch[ch].intr_arg = NULL; + + /* reset DMA engine */ + bcm_dma_reset(sc->sc_dev, ch); + } + + mtx_unlock(&sc->sc_mtx); + return (0); +} + +/* + * Assign handler function for channel interrupt + * Returns 0 on success, -1 otherwise + */ +int +bcm_dma_setup_intr(int ch, void (*func)(int, void *), void *arg) +{ + struct bcm_dma_softc *sc = bcm_dma_sc; + struct bcm_dma_cb *cb; + + if (ch < 0 || ch >= BCM_DMA_CH_MAX) + return (-1); + + if (!(sc->sc_dma_ch[ch].flags & BCM_DMA_CH_USED)) + return (-1); + + sc->sc_dma_ch[ch].intr_func = func; + sc->sc_dma_ch[ch].intr_arg = arg; + cb = sc->sc_dma_ch[ch].cb; + cb->info |= INFO_INT_EN; + + return (0); +} + +/* + * Setup DMA source parameters + * ch - channel number + * dreq - hardware DREQ # or BCM_DMA_DREQ_NONE if + * source is physical memory + * inc_addr - BCM_DMA_INC_ADDR if source address + * should be increased after each access or + * BCM_DMA_SAME_ADDR if address should remain + * the same + * width - size of read operation, BCM_DMA_32BIT + * for 32bit bursts, BCM_DMA_128BIT for 128 bits + * + * Returns 0 on success, -1 otherwise + */ +int +bcm_dma_setup_src(int ch, int dreq, int inc_addr, int width) +{ + struct bcm_dma_softc *sc = bcm_dma_sc; + uint32_t info; + + if (ch < 0 || ch >= BCM_DMA_CH_MAX) + return (-1); + + if (!(sc->sc_dma_ch[ch].flags & BCM_DMA_CH_USED)) + return (-1); + + info = sc->sc_dma_ch[ch].cb->info; + info &= ~INFO_PERMAP_MASK; + info |= (dreq << INFO_PERMAP_SHIFT) & INFO_PERMAP_MASK; + + if (dreq) + info |= INFO_S_DREQ; + else + info &= ~INFO_S_DREQ; + + if (width == BCM_DMA_128BIT) + info |= INFO_S_WIDTH; + else + info &= ~INFO_S_WIDTH; + + if (inc_addr == BCM_DMA_INC_ADDR) + info |= INFO_S_INC; + else + info &= ~INFO_S_INC; + + sc->sc_dma_ch[ch].cb->info = info; + + return (0); +} + +/* + * Setup DMA destination parameters + * ch - channel number + * dreq - hardware DREQ # or BCM_DMA_DREQ_NONE if + * destination is physical memory + * inc_addr - BCM_DMA_INC_ADDR if source address + * should be increased after each access or + * BCM_DMA_SAME_ADDR if address should remain + * the same + * width - size of write operation, BCM_DMA_32BIT + * for 32bit bursts, BCM_DMA_128BIT for 128 bits + * + * Returns 0 on success, -1 otherwise + */ +int +bcm_dma_setup_dst(int ch, int dreq, int inc_addr, int width) +{ + struct bcm_dma_softc *sc = bcm_dma_sc; + uint32_t info; + + if (ch < 0 || ch >= BCM_DMA_CH_MAX) + return (-1); + + if (!(sc->sc_dma_ch[ch].flags & BCM_DMA_CH_USED)) + return (-1); + + info = sc->sc_dma_ch[ch].cb->info; + info &= ~INFO_PERMAP_MASK; + info |= (dreq << INFO_PERMAP_SHIFT) & INFO_PERMAP_MASK; + + if (dreq) + info |= INFO_D_DREQ; + else + info &= ~INFO_D_DREQ; + + if (width == BCM_DMA_128BIT) + info |= INFO_D_WIDTH; + else + info &= ~INFO_D_WIDTH; + + if (inc_addr == BCM_DMA_INC_ADDR) + info |= INFO_D_INC; + else + info &= ~INFO_D_INC; + + sc->sc_dma_ch[ch].cb->info = info; + + return (0); +} + +#ifdef DEBUG +void +bcm_dma_cb_dump(struct bcm_dma_cb *cb) +{ + + printf("DMA CB "); + printf("INFO: %8.8x ", cb->info); + printf("SRC: %8.8x ", cb->src); + printf("DST: %8.8x ", cb->dst); + printf("LEN: %8.8x ", cb->len); + printf("\n"); + printf("STRIDE: %8.8x ", cb->stride); + printf("NEXT: %8.8x ", cb->next); + printf("RSVD1: %8.8x ", cb->rsvd1); + printf("RSVD2: %8.8x ", cb->rsvd2); + printf("\n"); +} + +void +bcm_dma_reg_dump(int ch) +{ + struct bcm_dma_softc *sc = bcm_dma_sc; + int i; + uint32_t reg; + + if (ch < 0 || ch >= BCM_DMA_CH_MAX) + return; + + printf("DMA%d: ", ch); + for (i = 0; i < MAX_REG; i++) { + reg = bus_read_4(sc->sc_mem, BCM_DMA_CH(ch) + i*4); + printf("%8.8x ", reg); + } + printf("\n"); +} +#endif + +/* + * Start DMA transaction + * ch - channel number + * src, dst - source and destination address in + * ARM physical memory address space. + * len - amount of bytes to be transfered + * + * Returns 0 on success, -1 otherwise + */ +int +bcm_dma_start(int ch, vm_paddr_t src, vm_paddr_t dst, int len) +{ + struct bcm_dma_softc *sc = bcm_dma_sc; + struct bcm_dma_cb *cb; + + if (ch < 0 || ch >= BCM_DMA_CH_MAX) + return (-1); + + if (!(sc->sc_dma_ch[ch].flags & BCM_DMA_CH_USED)) + return (-1); + + cb = sc->sc_dma_ch[ch].cb; + if (BCM2835_ARM_IS_IO(src)) + cb->src = IO_TO_VCBUS(src); + else + cb->src = PHYS_TO_VCBUS(src); + if (BCM2835_ARM_IS_IO(dst)) + cb->dst = IO_TO_VCBUS(dst); + else + cb->dst = PHYS_TO_VCBUS(dst); + cb->len = len; + + bus_dmamap_sync(sc->sc_dma_tag, + sc->sc_dma_ch[ch].dma_map, BUS_DMASYNC_PREWRITE); + + bus_write_4(sc->sc_mem, BCM_DMA_CBADDR(ch), + sc->sc_dma_ch[ch].vc_cb); + bus_write_4(sc->sc_mem, BCM_DMA_CS(ch), CS_ACTIVE); + +#ifdef DEBUG + bcm_dma_cb_dump(sc->sc_dma_ch[ch].cb); + bcm_dma_reg_dump(ch); +#endif + + return (0); +} + +/* + * Get length requested for DMA transaction + * ch - channel number + * + * Returns size of transaction, 0 if channel is invalid + */ +uint32_t +bcm_dma_length(int ch) +{ + struct bcm_dma_softc *sc = bcm_dma_sc; + struct bcm_dma_cb *cb; + + if (ch < 0 || ch >= BCM_DMA_CH_MAX) + return (0); + + if (!(sc->sc_dma_ch[ch].flags & BCM_DMA_CH_USED)) + return (0); + + cb = sc->sc_dma_ch[ch].cb; + + return (cb->len); +} + +static void +bcm_dma_intr(void *arg) +{ + struct bcm_dma_softc *sc = bcm_dma_sc; + struct bcm_dma_ch *ch = (struct bcm_dma_ch *)arg; + uint32_t cs, debug; + + /* my interrupt? */ + cs = bus_read_4(sc->sc_mem, BCM_DMA_CS(ch->ch)); + + if (!(cs & (CS_INT | CS_ERR))) + return; + + /* running? */ + if (!(ch->flags & BCM_DMA_CH_USED)) { + device_printf(sc->sc_dev, + "unused DMA intr CH=%d, CS=%x\n", ch->ch, cs); + return; + } + + if (cs & CS_ERR) { + debug = bus_read_4(sc->sc_mem, BCM_DMA_DEBUG(ch->ch)); + device_printf(sc->sc_dev, "DMA error %d on CH%d\n", + debug & DEBUG_ERROR_MASK, ch->ch); + bus_write_4(sc->sc_mem, BCM_DMA_DEBUG(ch->ch), + debug & DEBUG_ERROR_MASK); + } + + if (cs & CS_INT) { + /* acknowledge interrupt */ + bus_write_4(sc->sc_mem, BCM_DMA_CS(ch->ch), + CS_INT | CS_END); + + /* Prepare for possible access to len field */ + bus_dmamap_sync(sc->sc_dma_tag, ch->dma_map, + BUS_DMASYNC_POSTWRITE); + + /* save callback function and argument */ + if (ch->intr_func) + ch->intr_func(ch->ch, ch->intr_arg); + } +} + +static int +bcm_dma_probe(device_t dev) +{ + + if (!ofw_bus_is_compatible(dev, "broadcom,bcm2835-dma")) + return (ENXIO); + + device_set_desc(dev, "BCM2835 DMA Controller"); + return (BUS_PROBE_DEFAULT); +} + +static int +bcm_dma_attach(device_t dev) +{ + struct bcm_dma_softc *sc = device_get_softc(dev); + int rid, err = 0; + int i; + + sc->sc_dev = dev; + + if (bcm_dma_sc) + return (ENXIO); + + for (i = 0; i < BCM_DMA_CH_MAX; i++) { + sc->sc_irq[i] = NULL; + sc->sc_intrhand[i] = NULL; + } + + /* DMA0 - DMA14 */ + rid = 0; + sc->sc_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); + if (sc->sc_mem == NULL) { + device_printf(dev, "could not allocate memory resource\n"); + return (ENXIO); + } + + /* IRQ DMA0 - DMA11 XXX NOT USE DMA12(spurious?) */ + for (rid = 0; rid < BCM_DMA_CH_MAX; rid++) { + sc->sc_irq[rid] = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, + RF_ACTIVE); + if (sc->sc_irq[rid] == NULL) { + device_printf(dev, "cannot allocate interrupt\n"); + err = ENXIO; + goto fail; + } + if (bus_setup_intr(dev, sc->sc_irq[rid], INTR_TYPE_MISC | INTR_MPSAFE, + NULL, bcm_dma_intr, &sc->sc_dma_ch[rid], + &sc->sc_intrhand[rid])) { + device_printf(dev, "cannot setup interrupt handler\n"); + err = ENXIO; + goto fail; + } + } + + mtx_init(&sc->sc_mtx, "bcmdma", "bcmdma", MTX_DEF); + bcm_dma_sc = sc; + + err = bcm_dma_init(dev); + if (err) + goto fail; + + return (err); + +fail: + if (sc->sc_mem) + bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem); + + for (i = 0; i < BCM_DMA_CH_MAX; i++) { + if (sc->sc_intrhand[i]) + bus_teardown_intr(dev, sc->sc_irq[i], sc->sc_intrhand[i]); + if (sc->sc_irq[i]) + bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq[i]); + } + + return (err); +} + +static device_method_t bcm_dma_methods[] = { + DEVMETHOD(device_probe, bcm_dma_probe), + DEVMETHOD(device_attach, bcm_dma_attach), + { 0, 0 } +}; + +static driver_t bcm_dma_driver = { + "bcm_dma", + bcm_dma_methods, + sizeof(struct bcm_dma_softc), +}; + +static devclass_t bcm_dma_devclass; + +DRIVER_MODULE(bcm_dma, simplebus, bcm_dma_driver, bcm_dma_devclass, 0, 0); +MODULE_VERSION(bcm_dma, 1); diff --git a/sys/arm/broadcom/bcm2835/bcm2835_dma.h b/sys/arm/broadcom/bcm2835/bcm2835_dma.h new file mode 100644 index 0000000..785cf2c --- /dev/null +++ b/sys/arm/broadcom/bcm2835/bcm2835_dma.h @@ -0,0 +1,62 @@ +/* + * Copyright (c) 2013 Daisuke Aoyama <aoyama@peach.ne.jp> + * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@bluezbox.com> + * + * 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. + * + * $FreeBSD$ + */ + +#ifndef _BCM2835_DMA_H_ +#define _BCM2835_DMA_H_ + +#define BCM_DMA_BLOCK_SIZE 512 + +/* DMA0-DMA15 but DMA15 is special */ +#define BCM_DMA_CH_MAX 12 + +/* request CH for any nubmer */ +#define BCM_DMA_CH_INVALID (-1) +#define BCM_DMA_CH_ANY (-1) +#define BCM_DMA_CH_FAST1 (2) +#define BCM_DMA_CH_FAST2 (3) + +/* Peripheral DREQ Signals (4.2.1.3) */ +#define BCM_DMA_DREQ_NONE 0 +#define BCM_DMA_DREQ_EMMC 11 +#define BCM_DMA_DREQ_SDHOST 13 + +#define BCM_DMA_SAME_ADDR 0 +#define BCM_DMA_INC_ADDR 1 + +#define BCM_DMA_32BIT 0 +#define BCM_DMA_128BIT 1 + +int bcm_dma_allocate(int req_ch); +int bcm_dma_free(int ch); +int bcm_dma_setup_intr(int ch, void (*func)(int, void *), void *arg); +int bcm_dma_setup_src(int ch, int dreq, int inc_addr, int width); +int bcm_dma_setup_dst(int ch, int dreq, int inc_addr, int width); +int bcm_dma_start(int ch, vm_paddr_t src, vm_paddr_t dst, int len); +uint32_t bcm_dma_length(int ch); + +#endif /* _BCM2835_DMA_H_ */ diff --git a/sys/arm/broadcom/bcm2835/files.bcm2835 b/sys/arm/broadcom/bcm2835/files.bcm2835 index 9885155..aa1af40 100644 --- a/sys/arm/broadcom/bcm2835/files.bcm2835 +++ b/sys/arm/broadcom/bcm2835/files.bcm2835 @@ -1,5 +1,6 @@ # $FreeBSD$ +arm/broadcom/bcm2835/bcm2835_dma.c standard arm/broadcom/bcm2835/bcm2835_fb.c optional sc arm/broadcom/bcm2835/bcm2835_gpio.c optional gpio arm/broadcom/bcm2835/bcm2835_intr.c standard |