Author: br
Date: Tue Apr 19 14:47:08 2016
New Revision: 298269
URL: https://svnweb.freebsd.org/changeset/base/298269
Log:
Add driver for Xilinx AXI Quad SPI device. The device was found in
lowRISC hardware.
Sponsored by: DARPA, AFRL
Sponsored by: HEIF5
Added:
head/sys/dev/xilinx/
head/sys/dev/xilinx/axi_quad_spi.c (contents, props changed)
Added: head/sys/dev/xilinx/axi_quad_spi.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/dev/xilinx/axi_quad_spi.c Tue Apr 19 14:47:08 2016
(r298269)
@@ -0,0 +1,252 @@
+/*-
+ * Copyright (c) 2016 Ruslan Bukin <b...@bsdpad.com>
+ * All rights reserved.
+ *
+ * Portions of this software were developed by SRI International and the
+ * University of Cambridge Computer Laboratory under DARPA/AFRL contract
+ * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * Portions of this software were developed by the University of Cambridge
+ * Computer Laboratory as part of the CTSRD Project, with support from the
+ * UK Higher Education Innovation Fund (HEIF).
+ *
+ * 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.
+ */
+
+/*
+ * Xilinx AXI_QUAD_SPI
+ */
+
+#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/malloc.h>
+#include <sys/rman.h>
+#include <sys/timeet.h>
+#include <sys/timetc.h>
+#include <sys/watchdog.h>
+
+#include <dev/spibus/spi.h>
+#include <dev/spibus/spibusvar.h>
+
+#include "spibus_if.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 <machine/bus.h>
+#include <machine/cpu.h>
+#include <machine/intr.h>
+
+#define READ4(_sc, _reg) \
+ bus_space_read_4(_sc->bst, _sc->bsh, _reg)
+#define WRITE4(_sc, _reg, _val) \
+ bus_space_write_4(_sc->bst, _sc->bsh, _reg, _val)
+
+#define SPI_SRR 0x40 /* Software reset register */
+#define SRR_RESET 0x0A /* The only reset value */
+#define SPI_CR 0x60 /* Control register */
+#define CR_LSB_FIRST (1 << 9) /* LSB first */
+#define CR_MASTER_TI (1 << 8) /* Master Transaction Inhibit */
+#define CR_MSS (1 << 7) /* Manual Slave Select */
+#define CR_RST_RX (1 << 6) /* RX FIFO Reset */
+#define CR_RST_TX (1 << 5) /* TX FIFO Reset */
+#define CR_CPHA (1 << 4) /* Clock phase */
+#define CR_CPOL (1 << 3) /* Clock polarity */
+#define CR_MASTER (1 << 2) /* Master (SPI master mode) */
+#define CR_SPE (1 << 1) /* SPI system enable */
+#define CR_LOOP (1 << 0) /* Local loopback mode */
+#define SPI_SR 0x64 /* Status register */
+#define SR_TX_FULL (1 << 3) /* Transmit full */
+#define SR_TX_EMPTY (1 << 2) /* Transmit empty */
+#define SR_RX_FULL (1 << 1) /* Receive full */
+#define SR_RX_EMPTY (1 << 0) /* Receive empty */
+#define SPI_DTR 0x68 /* Data transmit register */
+#define SPI_DRR 0x6C /* Data receive register */
+#define SPI_SSR 0x70 /* Slave select register */
+#define SPI_TFOR 0x74 /* Transmit FIFO Occupancy
Register */
+#define SPI_RFOR 0x78 /* Receive FIFO Occupancy
Register */
+#define SPI_DGIER 0x1C /* Device global interrupt
enable register */
+#define SPI_IPISR 0x20 /* IP interrupt status register
*/
+#define SPI_IPIER 0x28 /* IP interrupt enable register
*/
+
+struct spi_softc {
+ struct resource *res[1];
+ bus_space_tag_t bst;
+ bus_space_handle_t bsh;
+ void *ih;
+};
+
+static struct resource_spec spi_spec[] = {
+ { SYS_RES_MEMORY, 0, RF_ACTIVE },
+ { -1, 0 }
+};
+
+static int
+spi_probe(device_t dev)
+{
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (!ofw_bus_is_compatible(dev, "xlnx,xps-spi-3.2"))
+ return (ENXIO);
+
+ device_set_desc(dev, "Xilinx Quad SPI");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+spi_chip_select(device_t dev, device_t child)
+{
+ struct spi_softc *sc;
+ uint32_t cs;
+
+ sc = device_get_softc(dev);
+
+ spibus_get_cs(child, &cs);
+
+ WRITE4(sc, SPI_SSR, ~(1 << cs));
+
+ return (0);
+}
+
+static int
+spi_chip_deselect(device_t dev, device_t child)
+{
+ struct spi_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ WRITE4(sc, SPI_SSR, ~0);
+
+ return (0);
+}
+
+static int
+spi_attach(device_t dev)
+{
+ struct spi_softc *sc;
+ uint32_t reg;
+
+ sc = device_get_softc(dev);
+
+ if (bus_alloc_resources(dev, spi_spec, sc->res)) {
+ device_printf(dev, "could not allocate resources\n");
+ return (ENXIO);
+ }
+
+ /* Memory interface */
+ sc->bst = rman_get_bustag(sc->res[0]);
+ sc->bsh = rman_get_bushandle(sc->res[0]);
+
+ /* Reset */
+ WRITE4(sc, SPI_SRR, SRR_RESET);
+
+ DELAY(1000);
+
+ reg = (CR_MASTER | CR_MSS | CR_RST_RX | CR_RST_TX);
+ WRITE4(sc, SPI_CR, reg);
+ WRITE4(sc, SPI_DGIER, 0); /* Disable interrupts */
+
+ reg = (CR_MASTER | CR_MSS | CR_SPE);
+ WRITE4(sc, SPI_CR, reg);
+
+ device_add_child(dev, "spibus", 0);
+ return (bus_generic_attach(dev));
+}
+
+static int
+spi_txrx(struct spi_softc *sc, uint8_t *out_buf,
+ uint8_t *in_buf, int bufsz, int cs)
+{
+ uint32_t data;
+ uint32_t i;
+
+ for (i = 0; i < bufsz; i++) {
+ WRITE4(sc, SPI_DTR, out_buf[i]);
+
+ while(!(READ4(sc, SPI_SR) & SR_TX_EMPTY))
+ continue;
+
+ data = READ4(sc, SPI_DRR);
+ if (in_buf)
+ in_buf[i] = (data & 0xff);
+ }
+
+ return (0);
+}
+
+static int
+spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
+{
+ struct spi_softc *sc;
+ uint32_t cs;
+
+ sc = device_get_softc(dev);
+
+ KASSERT(cmd->tx_cmd_sz == cmd->rx_cmd_sz,
+ ("%s: TX/RX command sizes should be equal", __func__));
+ KASSERT(cmd->tx_data_sz == cmd->rx_data_sz,
+ ("%s: TX/RX data sizes should be equal", __func__));
+
+ /* get the proper chip select */
+ spibus_get_cs(child, &cs);
+
+ /* Command */
+ spi_txrx(sc, cmd->tx_cmd, cmd->rx_cmd, cmd->tx_cmd_sz, cs);
+
+ /* Data */
+ spi_txrx(sc, cmd->tx_data, cmd->rx_data, cmd->tx_data_sz, cs);
+
+ return (0);
+}
+
+static device_method_t spi_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, spi_probe),
+ DEVMETHOD(device_attach, spi_attach),
+
+ /* SPI interface */
+ DEVMETHOD(spibus_transfer, spi_transfer),
+ DEVMETHOD(spibus_chip_select, spi_chip_select),
+ DEVMETHOD(spibus_chip_deselect, spi_chip_deselect),
+
+ DEVMETHOD_END
+};
+
+static driver_t spi_driver = {
+ "spi",
+ spi_methods,
+ sizeof(struct spi_softc),
+};
+
+static devclass_t spi_devclass;
+
+DRIVER_MODULE(spi, simplebus, spi_driver, spi_devclass, 0, 0);
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