607 lines
15 KiB
C
607 lines
15 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2011-2012 Ian Lepore All rights reserved.
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* Copyright (c) 2012 Marius Strobl <marius@FreeBSD.org> All rights reserved.
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* Copyright (c) 2006 M. Warner Losh <imp@FreeBSD.org>
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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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#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/endian.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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#include "opt_platform.h"
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#ifdef FDT
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/ofw/openfirm.h>
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static struct ofw_compat_data compat_data[] = {
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{ "atmel,at45", 1 },
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{ "atmel,dataflash", 1 },
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{ NULL, 0 },
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};
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#endif
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/* This is the information returned by the MANUFACTURER_ID command. */
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struct at45d_mfg_info {
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uint32_t jedec_id; /* Mfg ID, DevId1, DevId2, ExtLen */
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uint16_t ext_id; /* ExtId1, ExtId2 */
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};
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/*
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* This is an entry in our table of metadata describing the chips. We match on
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* both jedec id and extended id info returned by the MANUFACTURER_ID command.
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*/
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struct at45d_flash_ident
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{
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const char *name;
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uint32_t jedec;
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uint16_t extid;
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uint16_t extmask;
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uint16_t pagecount;
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uint16_t pageoffset;
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uint16_t pagesize;
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uint16_t pagesize2n;
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};
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struct at45d_softc
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{
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struct bio_queue_head bio_queue;
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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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device_t dev;
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u_int taskstate;
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uint16_t pagecount;
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uint16_t pageoffset;
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uint16_t pagesize;
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void *dummybuf;
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};
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#define TSTATE_STOPPED 0
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#define TSTATE_STOPPING 1
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#define TSTATE_RUNNING 2
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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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/* bus entry points */
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static device_attach_t at45d_attach;
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static device_detach_t at45d_detach;
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static device_probe_t at45d_probe;
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/* disk routines */
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static int at45d_close(struct disk *dp);
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static int at45d_open(struct disk *dp);
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static int at45d_getattr(struct bio *bp);
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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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/* helper routines */
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static void at45d_delayed_attach(void *xsc);
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static int at45d_get_mfg_info(device_t dev, struct at45d_mfg_info *resp);
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static int at45d_get_status(device_t dev, uint8_t *status);
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static int at45d_wait_ready(device_t dev, uint8_t *status);
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#define PAGE_TO_BUFFER_TRANSFER 0x53
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#define PAGE_TO_BUFFER_COMPARE 0x60
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#define PROGRAM_THROUGH_BUFFER 0x82
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#define MANUFACTURER_ID 0x9f
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#define STATUS_REGISTER_READ 0xd7
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#define CONTINUOUS_ARRAY_READ 0xe8
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#define STATUS_READY (1u << 7)
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#define STATUS_CMPFAIL (1u << 6)
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#define STATUS_PAGE2N (1u << 0)
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/*
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* Metadata for supported chips.
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*
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* The jedec id in this table includes the extended id length byte. A match is
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* based on both jedec id and extended id matching. The chip's extended id (not
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* present in most chips) is ANDed with ExtMask and the result is compared to
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* ExtId. If a chip only returns 1 ext id byte it will be in the upper 8 bits
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* of ExtId in this table.
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*
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* A sectorsize2n != 0 is used to indicate that a device optionally supports
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* 2^N byte pages. If support for the latter is enabled, the sector offset
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* has to be reduced by one.
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*/
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static const struct at45d_flash_ident at45d_flash_devices[] = {
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/* Part Name Jedec ID ExtId ExtMask PgCnt Offs PgSz PgSz2n */
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{ "AT45DB011B", 0x1f220000, 0x0000, 0x0000, 512, 9, 264, 256 },
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{ "AT45DB021B", 0x1f230000, 0x0000, 0x0000, 1024, 9, 264, 256 },
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{ "AT45DB041x", 0x1f240000, 0x0000, 0x0000, 2028, 9, 264, 256 },
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{ "AT45DB081B", 0x1f250000, 0x0000, 0x0000, 4096, 9, 264, 256 },
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{ "AT45DB161x", 0x1f260000, 0x0000, 0x0000, 4096, 10, 528, 512 },
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{ "AT45DB321x", 0x1f270000, 0x0000, 0x0000, 8192, 10, 528, 0 },
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{ "AT45DB321x", 0x1f270100, 0x0000, 0x0000, 8192, 10, 528, 512 },
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{ "AT45DB641E", 0x1f280001, 0x0000, 0xff00, 32768, 9, 264, 256 },
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{ "AT45DB642x", 0x1f280000, 0x0000, 0x0000, 8192, 11, 1056, 1024 },
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};
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static int
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at45d_get_status(device_t dev, uint8_t *status)
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{
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uint8_t rxBuf[8], txBuf[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 = cmd.tx_cmd_sz = 2;
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err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
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*status = rxBuf[1];
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return (err);
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}
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static int
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at45d_get_mfg_info(device_t dev, struct at45d_mfg_info *resp)
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{
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uint8_t rxBuf[8], txBuf[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 = cmd.rx_cmd_sz = 7;
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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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resp->jedec_id = be32dec(rxBuf + 1);
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resp->ext_id = be16dec(rxBuf + 5);
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return (0);
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}
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static int
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at45d_wait_ready(device_t dev, uint8_t *status)
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{
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struct timeval now, tout;
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int err;
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getmicrouptime(&tout);
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tout.tv_sec += 3;
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do {
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getmicrouptime(&now);
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if (now.tv_sec > tout.tv_sec)
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err = ETIMEDOUT;
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else
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err = at45d_get_status(dev, status);
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} while (err == 0 && !(*status & STATUS_READY));
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return (err);
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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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int rv;
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#ifdef FDT
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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rv = BUS_PROBE_DEFAULT;
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#else
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rv = BUS_PROBE_NOWILDCARD;
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#endif
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device_set_desc(dev, "AT45D Flash Family");
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return (rv);
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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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config_intrhook_oneshot(at45d_delayed_attach, sc);
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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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struct at45d_softc *sc;
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int err;
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sc = device_get_softc(dev);
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err = 0;
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AT45D_LOCK(sc);
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if (sc->taskstate == TSTATE_RUNNING) {
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sc->taskstate = TSTATE_STOPPING;
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wakeup(sc);
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while (err == 0 && sc->taskstate != TSTATE_STOPPED) {
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err = msleep(sc, &sc->sc_mtx, 0, "at45dt", hz * 3);
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if (err != 0) {
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sc->taskstate = TSTATE_RUNNING;
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device_printf(sc->dev,
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"Failed to stop queue task\n");
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}
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}
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}
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AT45D_UNLOCK(sc);
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if (err == 0 && sc->taskstate == TSTATE_STOPPED) {
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if (sc->disk) {
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disk_destroy(sc->disk);
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bioq_flush(&sc->bio_queue, NULL, ENXIO);
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free(sc->dummybuf, M_DEVBUF);
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}
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AT45D_LOCK_DESTROY(sc);
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}
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return (err);
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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;
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struct at45d_mfg_info mfginfo;
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const struct at45d_flash_ident *ident;
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u_int i;
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int sectorsize;
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uint32_t jedec;
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uint16_t pagesize;
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uint8_t status;
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sc = xsc;
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ident = NULL;
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jedec = 0;
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if (at45d_wait_ready(sc->dev, &status) != 0) {
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device_printf(sc->dev, "Error waiting for device-ready.\n");
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return;
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}
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if (at45d_get_mfg_info(sc->dev, &mfginfo) != 0) {
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device_printf(sc->dev, "Failed to get ID.\n");
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return;
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}
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for (i = 0; i < nitems(at45d_flash_devices); i++) {
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ident = &at45d_flash_devices[i];
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if (mfginfo.jedec_id == ident->jedec &&
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(mfginfo.ext_id & ident->extmask) == ident->extid) {
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break;
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}
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}
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if (i == nitems(at45d_flash_devices)) {
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device_printf(sc->dev, "JEDEC 0x%x not in list.\n", jedec);
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return;
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}
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sc->pagecount = ident->pagecount;
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sc->pageoffset = ident->pageoffset;
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if (ident->pagesize2n != 0 && (status & STATUS_PAGE2N)) {
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sc->pageoffset -= 1;
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pagesize = ident->pagesize2n;
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} else
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pagesize = ident->pagesize;
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sc->pagesize = pagesize;
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/*
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* By default we set up a disk with a sector size that matches the
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* device page size. If there is a device hint or fdt property
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* requesting a different size, use that, as long as it is a multiple of
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* the device page size).
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*/
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sectorsize = pagesize;
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#ifdef FDT
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{
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pcell_t size;
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if (OF_getencprop(ofw_bus_get_node(sc->dev),
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"freebsd,sectorsize", &size, sizeof(size)) > 0)
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sectorsize = size;
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}
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#endif
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resource_int_value(device_get_name(sc->dev), device_get_unit(sc->dev),
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"sectorsize", §orsize);
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if ((sectorsize % pagesize) != 0) {
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device_printf(sc->dev, "Invalid sectorsize %d, "
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"must be a multiple of %d\n", sectorsize, pagesize);
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return;
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}
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sc->dummybuf = malloc(pagesize, M_DEVBUF, M_WAITOK | M_ZERO);
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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_getattr = at45d_getattr;
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sc->disk->d_name = "flash/at45d";
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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 = sectorsize;
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sc->disk->d_mediasize = pagesize * ident->pagecount;
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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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kproc_create(&at45d_task, sc, &sc->p, 0, 0, "task: at45d flash");
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sc->taskstate = TSTATE_RUNNING;
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device_printf(sc->dev,
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"%s, %d bytes per page, %d pages; %d KBytes; disk sector size %d\n",
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ident->name, pagesize, ident->pagecount,
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(pagesize * ident->pagecount) / 1024, sectorsize);
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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 int
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at45d_getattr(struct bio *bp)
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{
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struct at45d_softc *sc;
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/*
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* This function exists to support geom_flashmap and fdt_slicer.
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*/
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if (bp->bio_disk == NULL || bp->bio_disk->d_drv1 == NULL)
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return (ENXIO);
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if (strcmp(bp->bio_attribute, "SPI::device") != 0)
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return (-1);
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sc = bp->bio_disk->d_drv1;
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if (bp->bio_length != sizeof(sc->dev))
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return (EFAULT);
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bcopy(&sc->dev, bp->bio_data, sizeof(sc->dev));
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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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uint8_t rxBuf[8], txBuf[8];
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struct at45d_softc *sc;
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struct bio *bp;
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struct spi_command cmd;
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device_t dev, pdev;
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caddr_t buf;
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u_long len, resid;
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u_int addr, berr, err, offset, page;
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uint8_t status;
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sc = (struct at45d_softc*)arg;
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dev = sc->dev;
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pdev = device_get_parent(dev);
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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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cmd.tx_cmd = txBuf;
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cmd.rx_cmd = rxBuf;
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for (;;) {
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AT45D_LOCK(sc);
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do {
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if (sc->taskstate == TSTATE_STOPPING) {
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sc->taskstate = TSTATE_STOPPED;
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AT45D_UNLOCK(sc);
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wakeup(sc);
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kproc_exit(0);
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}
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bp = bioq_takefirst(&sc->bio_queue);
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if (bp == NULL)
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msleep(sc, &sc->sc_mtx, PRIBIO, "at45dq", 0);
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} while (bp == NULL);
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AT45D_UNLOCK(sc);
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berr = 0;
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buf = bp->bio_data;
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len = resid = bp->bio_bcount;
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page = bp->bio_offset / sc->pagesize;
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offset = bp->bio_offset % sc->pagesize;
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switch (bp->bio_cmd) {
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case BIO_READ:
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txBuf[0] = CONTINUOUS_ARRAY_READ;
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cmd.tx_cmd_sz = cmd.rx_cmd_sz = 8;
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cmd.tx_data = sc->dummybuf;
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cmd.rx_data = buf;
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break;
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case BIO_WRITE:
|
|
cmd.tx_cmd_sz = cmd.rx_cmd_sz = 4;
|
|
cmd.tx_data = buf;
|
|
cmd.rx_data = sc->dummybuf;
|
|
if (resid + offset > sc->pagesize)
|
|
len = sc->pagesize - offset;
|
|
break;
|
|
default:
|
|
berr = EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* NB: for BIO_READ, this loop is only traversed once.
|
|
*/
|
|
while (resid > 0) {
|
|
if (page > sc->pagecount) {
|
|
berr = EINVAL;
|
|
goto out;
|
|
}
|
|
addr = page << sc->pageoffset;
|
|
if (bp->bio_cmd == BIO_WRITE) {
|
|
/*
|
|
* If writing less than a full page, transfer
|
|
* the existing page to the buffer, so that our
|
|
* PROGRAM_THROUGH_BUFFER below will preserve
|
|
* the parts of the page we're not writing.
|
|
*/
|
|
if (len != sc->pagesize) {
|
|
txBuf[0] = PAGE_TO_BUFFER_TRANSFER;
|
|
txBuf[1] = ((addr >> 16) & 0xff);
|
|
txBuf[2] = ((addr >> 8) & 0xff);
|
|
txBuf[3] = 0;
|
|
cmd.tx_data_sz = cmd.rx_data_sz = 0;
|
|
err = SPIBUS_TRANSFER(pdev, dev, &cmd);
|
|
if (err == 0)
|
|
err = at45d_wait_ready(dev,
|
|
&status);
|
|
if (err != 0) {
|
|
berr = EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
txBuf[0] = PROGRAM_THROUGH_BUFFER;
|
|
}
|
|
|
|
addr += offset;
|
|
txBuf[1] = ((addr >> 16) & 0xff);
|
|
txBuf[2] = ((addr >> 8) & 0xff);
|
|
txBuf[3] = (addr & 0xff);
|
|
cmd.tx_data_sz = cmd.rx_data_sz = len;
|
|
err = SPIBUS_TRANSFER(pdev, dev, &cmd);
|
|
if (err == 0 && bp->bio_cmd != BIO_READ)
|
|
err = at45d_wait_ready(dev, &status);
|
|
if (err != 0) {
|
|
berr = EIO;
|
|
goto out;
|
|
}
|
|
if (bp->bio_cmd == BIO_WRITE) {
|
|
addr = page << sc->pageoffset;
|
|
txBuf[0] = PAGE_TO_BUFFER_COMPARE;
|
|
txBuf[1] = ((addr >> 16) & 0xff);
|
|
txBuf[2] = ((addr >> 8) & 0xff);
|
|
txBuf[3] = 0;
|
|
cmd.tx_data_sz = cmd.rx_data_sz = 0;
|
|
err = SPIBUS_TRANSFER(pdev, dev, &cmd);
|
|
if (err == 0)
|
|
err = at45d_wait_ready(dev, &status);
|
|
if (err != 0 || (status & STATUS_CMPFAIL)) {
|
|
device_printf(dev, "comparing page "
|
|
"%d failed (status=0x%x)\n", page,
|
|
status);
|
|
berr = EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
page++;
|
|
buf += len;
|
|
offset = 0;
|
|
resid -= len;
|
|
if (resid > sc->pagesize)
|
|
len = sc->pagesize;
|
|
else
|
|
len = resid;
|
|
if (bp->bio_cmd == BIO_READ)
|
|
cmd.rx_data = buf;
|
|
else
|
|
cmd.tx_data = buf;
|
|
}
|
|
out:
|
|
if (berr != 0) {
|
|
bp->bio_flags |= BIO_ERROR;
|
|
bp->bio_error = berr;
|
|
}
|
|
bp->bio_resid = resid;
|
|
biodone(bp);
|
|
}
|
|
}
|
|
|
|
static device_method_t at45d_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, at45d_probe),
|
|
DEVMETHOD(device_attach, at45d_attach),
|
|
DEVMETHOD(device_detach, at45d_detach),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t at45d_driver = {
|
|
"at45d",
|
|
at45d_methods,
|
|
sizeof(struct at45d_softc),
|
|
};
|
|
|
|
DRIVER_MODULE(at45d, spibus, at45d_driver, NULL, NULL);
|
|
MODULE_DEPEND(at45d, spibus, 1, 1, 1);
|
|
#ifdef FDT
|
|
MODULE_DEPEND(at45d, fdt_slicer, 1, 1, 1);
|
|
SPIBUS_FDT_PNP_INFO(compat_data);
|
|
#endif
|
|
|