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f-stack/freebsd/mips/mediatek/mtk_spi_v2.c

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/*-
* Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
* Copyright (c) 2011, Aleksandr Rybalko <ray@FreeBSD.org>
* Copyright (c) 2013, Alexander A. Mityaev <sansan@adm.ua>
* Copyright (c) 2016, Stanislav Galabov <sgalabov@gmail.com>
* All rights reserved.
*
* 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 unmodified, 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/module.h>
#include <sys/rman.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <dev/spibus/spi.h>
#include <dev/spibus/spibusvar.h>
#include "spibus_if.h"
#include "opt_platform.h"
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <mips/mediatek/mtk_spi_v2.h>
#include <dev/flash/mx25lreg.h>
#undef MTK_SPI_DEBUG
#ifdef MTK_SPI_DEBUG
#define dprintf printf
#else
#define dprintf(x, arg...)
#endif
/*
* register space access macros
*/
#define SPI_WRITE(sc, reg, val) do { \
bus_write_4(sc->sc_mem_res, (reg), (val)); \
} while (0)
#define SPI_READ(sc, reg) bus_read_4(sc->sc_mem_res, (reg))
#define SPI_SET_BITS(sc, reg, bits) \
SPI_WRITE(sc, reg, SPI_READ(sc, (reg)) | (bits))
#define SPI_CLEAR_BITS(sc, reg, bits) \
SPI_WRITE(sc, reg, SPI_READ(sc, (reg)) & ~(bits))
struct mtk_spi_softc {
device_t sc_dev;
struct resource *sc_mem_res;
};
static int mtk_spi_probe(device_t);
static int mtk_spi_attach(device_t);
static int mtk_spi_detach(device_t);
static int mtk_spi_wait(struct mtk_spi_softc *);
static void mtk_spi_chip_activate(struct mtk_spi_softc *);
static void mtk_spi_chip_deactivate(struct mtk_spi_softc *);
static uint8_t mtk_spi_txrx(struct mtk_spi_softc *, uint8_t *, int);
static int mtk_spi_transfer(device_t, device_t, struct spi_command *);
static phandle_t mtk_spi_get_node(device_t, device_t);
static struct ofw_compat_data compat_data[] = {
{ "ralink,mt7621-spi", 1 },
{ "ralink,mtk7628an-spi", 1 },
{ NULL, 0 }
};
static int
mtk_spi_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return(ENXIO);
device_set_desc(dev, "MTK SPI Controller (v2)");
return (0);
}
static int
mtk_spi_attach(device_t dev)
{
struct mtk_spi_softc *sc = device_get_softc(dev);
uint32_t val;
int rid;
sc->sc_dev = dev;
rid = 0;
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (!sc->sc_mem_res) {
device_printf(dev, "Could not map memory\n");
return (ENXIO);
}
if (mtk_spi_wait(sc)) {
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
return (EBUSY);
}
val = SPI_READ(sc, MTK_SPIMASTER);
val &= ~(0xfff << 16);
val |= 13 << 16;
val |= 7 << 29;
val |= 1 << 2;
SPI_WRITE(sc, MTK_SPIMASTER, val);
/*
* W25Q64CV max 104MHz, bus 120-192 MHz, so divide by 2.
* Update: divide by 4, DEV2 to fast for flash.
*/
device_add_child(dev, "spibus", 0);
return (bus_generic_attach(dev));
}
static int
mtk_spi_detach(device_t dev)
{
struct mtk_spi_softc *sc = device_get_softc(dev);
if (sc->sc_mem_res)
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
return (0);
}
static void
mtk_spi_chip_activate(struct mtk_spi_softc *sc)
{
mtk_spi_wait(sc);
/*
* Put all CSx to low
*/
SPI_SET_BITS(sc, MTK_SPIPOLAR, 1);
}
static void
mtk_spi_chip_deactivate(struct mtk_spi_softc *sc)
{
mtk_spi_wait(sc);
/*
* Put all CSx to high
*/
SPI_CLEAR_BITS(sc, MTK_SPIPOLAR, 1);
}
static int
mtk_spi_wait(struct mtk_spi_softc *sc)
{
int i = 1000;
while (i--) {
if (!(SPI_READ(sc, MTK_SPITRANS) & SPIBUSY))
break;
}
if (i == 0) {
return (1);
}
return (0);
}
static uint8_t
mtk_spi_txrx(struct mtk_spi_softc *sc, uint8_t *data, int write)
{
if (mtk_spi_wait(sc))
return (0xff);
if (write == MTK_SPI_WRITE) {
SPI_WRITE(sc, MTK_SPIOPCODE, (*data));
SPI_WRITE(sc, MTK_SPIMOREBUF, (8<<24));
} else {
SPI_WRITE(sc, MTK_SPIMOREBUF, (8<<12));
}
SPI_SET_BITS(sc, MTK_SPITRANS, SPISTART);
if (mtk_spi_wait(sc))
return (0xff);
if (write == MTK_SPI_READ) {
*data = SPI_READ(sc, MTK_SPIDATA) & 0xff;
}
return (0);
}
static int
mtk_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
{
struct mtk_spi_softc *sc;
uint8_t *buf, byte, *tx_buf;
struct spibus_ivar *devi = SPIBUS_IVAR(child);
int i, sz, error, write = 0;
sc = device_get_softc(dev);
if (devi->cs != 0)
/* Only 1 CS */
return (ENXIO);
/* There is always a command to transfer. */
tx_buf = (uint8_t *)(cmd->tx_cmd);
/* Perform some fixup because MTK dont support duplex SPI */
switch(tx_buf[0]) {
case CMD_READ_IDENT:
cmd->tx_cmd_sz = 1;
cmd->rx_cmd_sz = 3;
break;
case CMD_ENTER_4B_MODE:
case CMD_EXIT_4B_MODE:
case CMD_WRITE_ENABLE:
case CMD_WRITE_DISABLE:
cmd->tx_cmd_sz = 1;
cmd->rx_cmd_sz = 0;
break;
case CMD_READ_STATUS:
cmd->tx_cmd_sz = 1;
cmd->rx_cmd_sz = 1;
break;
case CMD_READ:
case CMD_FAST_READ:
cmd->rx_cmd_sz = cmd->tx_data_sz = 0;
break;
case CMD_SECTOR_ERASE:
cmd->rx_cmd_sz = 0;
break;
case CMD_PAGE_PROGRAM:
cmd->rx_cmd_sz = cmd->rx_data_sz = 0;
break;
}
mtk_spi_chip_activate(sc);
if (cmd->tx_cmd_sz + cmd->rx_cmd_sz) {
buf = (uint8_t *)(cmd->rx_cmd);
tx_buf = (uint8_t *)(cmd->tx_cmd);
sz = cmd->tx_cmd_sz + cmd->rx_cmd_sz;
for (i = 0; i < sz; i++) {
if(i < cmd->tx_cmd_sz) {
byte = tx_buf[i];
error = mtk_spi_txrx(sc, &byte,
MTK_SPI_WRITE);
if (error)
goto mtk_spi_transfer_fail;
continue;
}
error = mtk_spi_txrx(sc, &byte,
MTK_SPI_READ);
if (error)
goto mtk_spi_transfer_fail;
buf[i] = byte;
}
}
/*
* Transfer/Receive data
*/
if (cmd->tx_data_sz + cmd->rx_data_sz) {
write = (cmd->tx_data_sz > 0)?1:0;
buf = (uint8_t *)(write ? cmd->tx_data : cmd->rx_data);
sz = write ? cmd->tx_data_sz : cmd->rx_data_sz;
for (i = 0; i < sz; i++) {
byte = buf[i];
error = mtk_spi_txrx(sc, &byte,
write ? MTK_SPI_WRITE : MTK_SPI_READ);
if (error)
goto mtk_spi_transfer_fail;
buf[i] = byte;
}
}
mtk_spi_transfer_fail:
mtk_spi_chip_deactivate(sc);
return (0);
}
static phandle_t
mtk_spi_get_node(device_t bus, device_t dev)
{
/* We only have one child, the SPI bus, which needs our own node. */
return (ofw_bus_get_node(bus));
}
static device_method_t mtk_spi_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, mtk_spi_probe),
DEVMETHOD(device_attach, mtk_spi_attach),
DEVMETHOD(device_detach, mtk_spi_detach),
DEVMETHOD(spibus_transfer, mtk_spi_transfer),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_node, mtk_spi_get_node),
DEVMETHOD_END
};
static driver_t mtk_spi_driver = {
.name = "spi",
.methods = mtk_spi_methods,
.size = sizeof(struct mtk_spi_softc),
};
static devclass_t mtk_spi_devclass;
DRIVER_MODULE(mtk_spi_v2, simplebus, mtk_spi_driver, mtk_spi_devclass, 0, 0);
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