Author: loos
Date: Wed Nov 14 14:26:32 2018
New Revision: 340432
URL: https://svnweb.freebsd.org/changeset/base/340432
Log:
Add the driver for the SPI controller on ARMADA38X.
Tested on Clearfog (Pro) and SG-3100.
Sponsored by: Rubicon Communications, LLC (Netgate)
Added:
head/sys/arm/mv/mv_spi.c (contents, props changed)
Modified:
head/sys/arm/conf/ARMADA38X
head/sys/arm/conf/GENERIC
head/sys/arm/mv/files.arm7
Modified: head/sys/arm/conf/ARMADA38X
==============================================================================
--- head/sys/arm/conf/ARMADA38X Wed Nov 14 14:18:35 2018 (r340431)
+++ head/sys/arm/conf/ARMADA38X Wed Nov 14 14:26:32 2018 (r340432)
@@ -76,6 +76,11 @@ device iic
device iicbus
device twsi
+# SPI
+device spibus
+device spigen
+device mv_spi
+
# Wireless NIC cards
device wlan # 802.11 support
device ath # Atheros NIC's
Modified: head/sys/arm/conf/GENERIC
==============================================================================
--- head/sys/arm/conf/GENERIC Wed Nov 14 14:18:35 2018 (r340431)
+++ head/sys/arm/conf/GENERIC Wed Nov 14 14:26:32 2018 (r340432)
@@ -169,6 +169,7 @@ device aw_cir
device spibus
device spigen
device bcm2835_spi
+device mv_spi
device ti_spi
# ADC support
Modified: head/sys/arm/mv/files.arm7
==============================================================================
--- head/sys/arm/mv/files.arm7 Wed Nov 14 14:18:35 2018 (r340431)
+++ head/sys/arm/mv/files.arm7 Wed Nov 14 14:26:32 2018 (r340432)
@@ -18,6 +18,7 @@ arm/mv/armada38x/armada38x_mp.c optional smp
arm/mv/armada38x/pmsu.c standard
arm/mv/armada38x/armada38x_rtc.c standard
arm/mv/armada38x/armada38x_pl310.c optional pl310
+arm/mv/mv_spi.c optional mv_spi spibus
dev/sdhci/sdhci_fdt.c optional sdhci
arm/mv/rtc.c standard
Added: head/sys/arm/mv/mv_spi.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/arm/mv/mv_spi.c Wed Nov 14 14:26:32 2018 (r340432)
@@ -0,0 +1,351 @@
+/*-
+ * Copyright (c) 2017-2018, Rubicon Communications, LLC (Netgate)
+ * 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, 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 ``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 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 <machine/bus.h>
+#include <machine/resource.h>
+#include <machine/intr.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/spibus/spi.h>
+#include <dev/spibus/spibusvar.h>
+
+#include "spibus_if.h"
+
+struct mv_spi_softc {
+ device_t sc_dev;
+ struct mtx sc_mtx;
+ struct resource *sc_mem_res;
+ struct resource *sc_irq_res;
+ struct spi_command *sc_cmd;
+ bus_space_tag_t sc_bst;
+ bus_space_handle_t sc_bsh;
+ uint32_t sc_len;
+ uint32_t sc_read;
+ uint32_t sc_flags;
+ uint32_t sc_written;
+ void *sc_intrhand;
+};
+
+#define MV_SPI_BUSY 0x1
+#define MV_SPI_WRITE(_sc, _off, _val) \
+ bus_space_write_4((_sc)->sc_bst, (_sc)->sc_bsh, (_off), (_val))
+#define MV_SPI_READ(_sc, _off) \
+ bus_space_read_4((_sc)->sc_bst, (_sc)->sc_bsh, (_off))
+#define MV_SPI_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
+#define MV_SPI_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
+
+#define MV_SPI_CONTROL 0
+#define MV_SPI_CTRL_CS_SHIFT 2
+#define MV_SPI_CTRL_SMEMREADY (1 << 1)
+#define MV_SPI_CTRL_CS_ACTIVE (1 << 0)
+#define MV_SPI_CONF 0x4
+#define MV_SPI_CONF_BYTELEN (1 << 5)
+#define MV_SPI_DATAOUT 0x8
+#define MV_SPI_DATAIN 0xc
+#define MV_SPI_INTR_STAT 0x10
+#define MV_SPI_INTR_MASK 0x14
+#define MV_SPI_INTR_SMEMREADY (1 << 0)
+
+static struct ofw_compat_data compat_data[] = {
+ {"marvell,armada-380-spi", 1},
+ {NULL, 0}
+};
+
+static void mv_spi_intr(void *);
+
+static int
+mv_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, "Marvell SPI controller");
+
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+mv_spi_attach(device_t dev)
+{
+ struct mv_spi_softc *sc;
+ int rid;
+ uint32_t reg;
+
+ sc = device_get_softc(dev);
+ 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, "cannot allocate memory window\n");
+ return (ENXIO);
+ }
+
+ sc->sc_bst = rman_get_bustag(sc->sc_mem_res);
+ sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res);
+
+ rid = 0;
+ sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
+ RF_ACTIVE);
+ if (!sc->sc_irq_res) {
+ bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
+ device_printf(dev, "cannot allocate interrupt\n");
+ return (ENXIO);
+ }
+
+ /* Deactivate the bus - just in case... */
+ reg = MV_SPI_READ(sc, MV_SPI_CONTROL);
+ MV_SPI_WRITE(sc, MV_SPI_CONTROL, reg & ~MV_SPI_CTRL_CS_ACTIVE);
+
+ /* Disable the two bytes FIFO. */
+ reg = MV_SPI_READ(sc, MV_SPI_CONF);
+ MV_SPI_WRITE(sc, MV_SPI_CONF, reg & ~MV_SPI_CONF_BYTELEN);
+
+ /* Clear and disable interrupts. */
+ MV_SPI_WRITE(sc, MV_SPI_INTR_MASK, 0);
+ MV_SPI_WRITE(sc, MV_SPI_INTR_STAT, 0);
+
+ /* Hook up our interrupt handler. */
+ if (bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
+ NULL, mv_spi_intr, sc, &sc->sc_intrhand)) {
+ bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res);
+ bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
+ device_printf(dev, "cannot setup the interrupt handler\n");
+ return (ENXIO);
+ }
+
+ mtx_init(&sc->sc_mtx, "mv_spi", NULL, MTX_DEF);
+
+ device_add_child(dev, "spibus", -1);
+
+ /* Probe and attach the spibus when interrupts are available. */
+ config_intrhook_oneshot((ich_func_t)bus_generic_attach, dev);
+
+ return (0);
+}
+
+static int
+mv_spi_detach(device_t dev)
+{
+ struct mv_spi_softc *sc;
+
+ bus_generic_detach(dev);
+
+ sc = device_get_softc(dev);
+ mtx_destroy(&sc->sc_mtx);
+ if (sc->sc_intrhand)
+ bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intrhand);
+ if (sc->sc_irq_res)
+ bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res);
+ if (sc->sc_mem_res)
+ bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
+
+ return (0);
+}
+
+static __inline void
+mv_spi_rx_byte(struct mv_spi_softc *sc)
+{
+ struct spi_command *cmd;
+ uint32_t read;
+ uint8_t *p;
+
+ cmd = sc->sc_cmd;
+ p = (uint8_t *)cmd->rx_cmd;
+ read = sc->sc_read++;
+ if (read >= cmd->rx_cmd_sz) {
+ p = (uint8_t *)cmd->rx_data;
+ read -= cmd->rx_cmd_sz;
+ }
+ p[read] = MV_SPI_READ(sc, MV_SPI_DATAIN) & 0xff;
+}
+
+static __inline void
+mv_spi_tx_byte(struct mv_spi_softc *sc)
+{
+ struct spi_command *cmd;
+ uint32_t written;
+ uint8_t *p;
+
+ cmd = sc->sc_cmd;
+ p = (uint8_t *)cmd->tx_cmd;
+ written = sc->sc_written++;
+ if (written >= cmd->tx_cmd_sz) {
+ p = (uint8_t *)cmd->tx_data;
+ written -= cmd->tx_cmd_sz;
+ }
+ MV_SPI_WRITE(sc, MV_SPI_DATAOUT, p[written]);
+}
+
+static void
+mv_spi_intr(void *arg)
+{
+ struct mv_spi_softc *sc;
+
+ sc = (struct mv_spi_softc *)arg;
+ MV_SPI_LOCK(sc);
+
+ /* Filter stray interrupts. */
+ if ((sc->sc_flags & MV_SPI_BUSY) == 0) {
+ MV_SPI_UNLOCK(sc);
+ return;
+ }
+
+ /* RX */
+ mv_spi_rx_byte(sc);
+
+ /* TX */
+ mv_spi_tx_byte(sc);
+
+ /* Check for end of transfer. */
+ if (sc->sc_written == sc->sc_len && sc->sc_read == sc->sc_len)
+ wakeup(sc->sc_dev);
+
+ MV_SPI_UNLOCK(sc);
+}
+
+static int
+mv_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
+{
+ struct mv_spi_softc *sc;
+ uint32_t cs, reg;
+ int resid, timeout;
+
+ KASSERT(cmd->tx_cmd_sz == cmd->rx_cmd_sz,
+ ("TX/RX command sizes should be equal"));
+ KASSERT(cmd->tx_data_sz == cmd->rx_data_sz,
+ ("TX/RX data sizes should be equal"));
+
+ /* Get the proper chip select for this child. */
+ spibus_get_cs(child, &cs);
+ cs &= ~SPIBUS_CS_HIGH;
+
+ sc = device_get_softc(dev);
+ MV_SPI_LOCK(sc);
+
+ /* Wait until the controller is free. */
+ while (sc->sc_flags & MV_SPI_BUSY)
+ mtx_sleep(dev, &sc->sc_mtx, 0, "mv_spi", 0);
+
+ /* Now we have control over SPI controller. */
+ sc->sc_flags = MV_SPI_BUSY;
+
+ /* Save a pointer to the SPI command. */
+ sc->sc_cmd = cmd;
+ sc->sc_read = 0;
+ sc->sc_written = 0;
+ sc->sc_len = cmd->tx_cmd_sz + cmd->tx_data_sz;
+
+ MV_SPI_WRITE(sc, MV_SPI_CONTROL, cs << MV_SPI_CTRL_CS_SHIFT);
+ reg = MV_SPI_READ(sc, MV_SPI_CONTROL);
+ MV_SPI_WRITE(sc, MV_SPI_CONTROL, reg | MV_SPI_CTRL_CS_ACTIVE);
+
+ while ((resid = sc->sc_len - sc->sc_written) > 0) {
+
+ MV_SPI_WRITE(sc, MV_SPI_INTR_STAT, 0);
+
+ /*
+ * Write to start the transmission and read the byte
+ * back when ready.
+ */
+ mv_spi_tx_byte(sc);
+ timeout = 1000;
+ while (--timeout > 0) {
+ reg = MV_SPI_READ(sc, MV_SPI_CONTROL);
+ if (reg & MV_SPI_CTRL_SMEMREADY)
+ break;
+ DELAY(1);
+ }
+ if (timeout == 0)
+ break;
+ mv_spi_rx_byte(sc);
+ }
+
+ /* Stop the controller. */
+ reg = MV_SPI_READ(sc, MV_SPI_CONTROL);
+ MV_SPI_WRITE(sc, MV_SPI_CONTROL, reg & ~MV_SPI_CTRL_CS_ACTIVE);
+ MV_SPI_WRITE(sc, MV_SPI_INTR_MASK, 0);
+ MV_SPI_WRITE(sc, MV_SPI_INTR_STAT, 0);
+
+ /* Release the controller and wakeup the next thread waiting for it. */
+ sc->sc_flags = 0;
+ wakeup_one(dev);
+ MV_SPI_UNLOCK(sc);
+
+ /*
+ * Check for transfer timeout. The SPI controller doesn't
+ * return errors.
+ */
+ return ((timeout == 0) ? EIO : 0);
+}
+
+static phandle_t
+mv_spi_get_node(device_t bus, device_t dev)
+{
+
+ return (ofw_bus_get_node(bus));
+}
+
+static device_method_t mv_spi_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, mv_spi_probe),
+ DEVMETHOD(device_attach, mv_spi_attach),
+ DEVMETHOD(device_detach, mv_spi_detach),
+
+ /* SPI interface */
+ DEVMETHOD(spibus_transfer, mv_spi_transfer),
+
+ /* ofw_bus interface */
+ DEVMETHOD(ofw_bus_get_node, mv_spi_get_node),
+
+ DEVMETHOD_END
+};
+
+static devclass_t mv_spi_devclass;
+
+static driver_t mv_spi_driver = {
+ "spi",
+ mv_spi_methods,
+ sizeof(struct mv_spi_softc),
+};
+
+DRIVER_MODULE(mv_spi, simplebus, mv_spi_driver, mv_spi_devclass, 0, 0);
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