f8717ce4d7
Preliminary support for Atmel AT45D series of DataFlash on the SPI bus (ok, not really a hardware bus, but a logical connection). This works only for the 8MB version of the part due to hard coding. Both read and write are supported.
285 lines
7.1 KiB
C
285 lines
7.1 KiB
C
/*-
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* Copyright (c) 2006 M. Warner Losh. 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/gpio.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <geom/geom_disk.h>
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#include <dev/spibus/spi.h>
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#include "spibus_if.h"
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struct at45d_softc
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{
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struct intr_config_hook config_intrhook;
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device_t dev;
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struct mtx sc_mtx;
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struct disk *disk;
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struct proc *p;
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struct bio_queue_head bio_queue;
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};
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#define AT45D_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
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#define AT45D_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
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#define AT45D_LOCK_INIT(_sc) \
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mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
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"at45d", MTX_DEF)
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#define AT45D_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
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#define AT45D_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
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#define AT45D_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
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static void at45d_delayed_attach(void *xsc);
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/* disk routines */
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static int at45d_open(struct disk *dp);
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static int at45d_close(struct disk *dp);
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static void at45d_strategy(struct bio *bp);
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static void at45d_task(void *arg);
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#define CONTINUOUS_ARRAY_READ 0xE8
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#define CONTINUOUS_ARRAY_READ_HF 0x0B
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#define CONTINUOUS_ARRAY_READ_LF 0x03
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#define STATUS_REGISTER_READ 0xD7
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#define PROGRAM_THROUGH_BUFFER 0x82
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#define MANUFACTURER_ID 0x9F
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static uint8_t
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at45d_get_status(device_t dev)
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{
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uint8_t txBuf[8], rxBuf[8];
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struct spi_command cmd;
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int err;
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memset(&cmd, 0, sizeof(cmd));
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memset(txBuf, 0, sizeof(txBuf));
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memset(rxBuf, 0, sizeof(rxBuf));
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txBuf[0] = STATUS_REGISTER_READ;
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cmd.tx_cmd = txBuf;
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cmd.rx_cmd = rxBuf;
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cmd.rx_cmd_sz = 2;
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cmd.tx_cmd_sz = 2;
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err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
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return (rxBuf[1]);
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}
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static void
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at45d_wait_for_device_ready(device_t dev)
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{
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while (!(at45d_get_status(dev) & 0x80))
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continue;
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}
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static int
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at45d_get_mfg_info(device_t dev, uint8_t *resp)
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{
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uint8_t txBuf[8], rxBuf[8];
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struct spi_command cmd;
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int err;
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memset(&cmd, 0, sizeof(cmd));
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memset(txBuf, 0, sizeof(txBuf));
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memset(rxBuf, 0, sizeof(rxBuf));
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txBuf[0] = MANUFACTURER_ID;
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cmd.tx_cmd = &txBuf;
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cmd.rx_cmd = &rxBuf;
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cmd.tx_cmd_sz = 5;
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cmd.rx_cmd_sz = 5;
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err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
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if (err)
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return (err);
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memcpy(resp, rxBuf + 1, 4);
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// XXX We really should 'decode' the reply into some kind of
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// XXX structure. To be generic (and not just for atmel parts)
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// XXX we'd have to loop until we got a full reply.
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return (0);
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}
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static int
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at45d_probe(device_t dev)
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{
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device_set_desc(dev, "AT45 Flash Family");
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return (0);
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}
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static int
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at45d_attach(device_t dev)
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{
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struct at45d_softc *sc;
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sc = device_get_softc(dev);
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sc->dev = dev;
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AT45D_LOCK_INIT(sc);
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/* We'll see what kind of flash we have later... */
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sc->config_intrhook.ich_func = at45d_delayed_attach;
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sc->config_intrhook.ich_arg = sc;
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if (config_intrhook_establish(&sc->config_intrhook) != 0)
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device_printf(dev, "config_intrhook_establish failed\n");
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return (0);
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}
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static int
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at45d_detach(device_t dev)
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{
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return EIO;
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}
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static void
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at45d_delayed_attach(void *xsc)
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{
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struct at45d_softc *sc = xsc;
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uint8_t buf[4];
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at45d_get_mfg_info(sc->dev, buf);
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at45d_wait_for_device_ready(sc->dev);
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sc->disk = disk_alloc();
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sc->disk->d_open = at45d_open;
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sc->disk->d_close = at45d_close;
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sc->disk->d_strategy = at45d_strategy;
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sc->disk->d_name = "flash/spi";
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sc->disk->d_drv1 = sc;
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sc->disk->d_maxsize = DFLTPHYS;
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sc->disk->d_sectorsize = 1056; /* XXX */
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sc->disk->d_mediasize = 8192 * 1056; /* XXX */
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sc->disk->d_unit = device_get_unit(sc->dev);
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disk_create(sc->disk, DISK_VERSION);
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bioq_init(&sc->bio_queue);
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kthread_create(&at45d_task, sc, &sc->p, 0, 0, "task: at45d flash");
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config_intrhook_disestablish(&sc->config_intrhook);
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}
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static int
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at45d_open(struct disk *dp)
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{
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return 0;
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}
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static int
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at45d_close(struct disk *dp)
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{
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return 0;
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}
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static void
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at45d_strategy(struct bio *bp)
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{
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struct at45d_softc *sc;
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sc = (struct at45d_softc *)bp->bio_disk->d_drv1;
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AT45D_LOCK(sc);
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bioq_disksort(&sc->bio_queue, bp);
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wakeup(sc);
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AT45D_UNLOCK(sc);
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}
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static void
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at45d_task(void *arg)
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{
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struct at45d_softc *sc = (struct at45d_softc*)arg;
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struct bio *bp;
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uint8_t txBuf[8], rxBuf[8];
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struct spi_command cmd;
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int sz;
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daddr_t block, end;
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device_t dev, pdev;
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int err;
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for (;;) {
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dev = sc->dev;
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pdev = device_get_parent(dev);
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AT45D_LOCK(sc);
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do {
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bp = bioq_first(&sc->bio_queue);
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if (bp == NULL)
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msleep(sc, &sc->sc_mtx, PRIBIO, "jobqueue", 0);
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} while (bp == NULL);
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bioq_remove(&sc->bio_queue, bp);
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AT45D_UNLOCK(sc);
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sz = sc->disk->d_sectorsize;
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end = bp->bio_pblkno + (bp->bio_bcount / sz);
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for (block = bp->bio_pblkno; block < end; block++) {
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char *vaddr = bp->bio_data + (block - bp->bio_pblkno) * sz;
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if (bp->bio_cmd == BIO_READ) {
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txBuf[0] = CONTINUOUS_ARRAY_READ_HF;
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cmd.tx_cmd_sz = 5;
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cmd.rx_cmd_sz = 5;
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} else {
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txBuf[0] = PROGRAM_THROUGH_BUFFER;
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cmd.tx_cmd_sz = 4;
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cmd.rx_cmd_sz = 4;
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}
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// XXX only works on certain devices... Fixme
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txBuf[1] = ((block >> 5) & 0xFF);
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txBuf[2] = ((block << 3) & 0xF8);
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txBuf[3] = 0;
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txBuf[4] = 0;
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cmd.tx_cmd = txBuf;
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cmd.rx_cmd = rxBuf;
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cmd.tx_data = vaddr;
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cmd.tx_data_sz = sz;
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cmd.rx_data = vaddr;
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cmd.rx_data_sz = sz;
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err = SPIBUS_TRANSFER(pdev, dev, &cmd);
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// XXX err check?
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}
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biodone(bp);
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}
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}
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static devclass_t at45d_devclass;
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static device_method_t at45d_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, at45d_probe),
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DEVMETHOD(device_attach, at45d_attach),
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DEVMETHOD(device_detach, at45d_detach),
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{ 0, 0 }
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};
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static driver_t at45d_driver = {
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"at45d",
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at45d_methods,
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sizeof(struct at45d_softc),
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};
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DRIVER_MODULE(at45d, spibus, at45d_driver, at45d_devclass, 0, 0);
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