Author: loos
Date: Fri Dec 6 12:55:39 2019
New Revision: 355444
URL: https://svnweb.freebsd.org/changeset/base/355444
Log:
Add the SPI driver for the Marvell Armada 37x0 SoC.
Interrupt based driver, implements SPI mode and clock configuration.
Tested on espressobin and SG-3200.
Sponsored by: Rubicon Communications, LLC (Netgate)
Added:
head/sys/arm/mv/a37x0_spi.c (contents, props changed)
Modified:
head/sys/arm64/conf/GENERIC
head/sys/conf/files.arm64
Added: head/sys/arm/mv/a37x0_spi.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/arm/mv/a37x0_spi.c Fri Dec 6 12:55:39 2019 (r355444)
@@ -0,0 +1,494 @@
+/*-
+ * Copyright (c) 2018, 2019 Rubicon Communications, LLC (Netgate)
+ *
+ * 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 a37x0_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_maxfreq;
+ uint32_t sc_read;
+ uint32_t sc_flags;
+ uint32_t sc_written;
+ void *sc_intrhand;
+};
+
+#define A37X0_SPI_WRITE(_sc, _off, _val) \
+ bus_space_write_4((_sc)->sc_bst, (_sc)->sc_bsh, (_off), (_val))
+#define A37X0_SPI_READ(_sc, _off) \
+ bus_space_read_4((_sc)->sc_bst, (_sc)->sc_bsh, (_off))
+#define A37X0_SPI_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
+#define A37X0_SPI_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
+
+#define A37X0_SPI_BUSY (1 << 0)
+/*
+ * While the A3700 utils from Marvell usually sets the QSF clock to 200MHz,
+ * there is no guarantee that it is correct without the proper clock framework
+ * to retrieve the actual TBG and PLL settings.
+ */
+#define A37X0_SPI_CLOCK 200000000 /* QSF Clock
200MHz */
+
+#define A37X0_SPI_CONTROL 0x0
+#define A37X0_SPI_CS_SHIFT 16
+#define A37X0_SPI_CS_MASK (0xf << A37X0_SPI_CS_SHIFT)
+#define A37X0_SPI_CONF 0x4
+#define A37X0_SPI_WFIFO_THRS_SHIFT 28
+#define A37X0_SPI_RFIFO_THRS_SHIFT 24
+#define A37X0_SPI_AUTO_CS_EN (1 << 20)
+#define A37X0_SPI_DMA_WR_EN (1 << 19)
+#define A37X0_SPI_DMA_RD_EN (1 << 18)
+#define A37X0_SPI_FIFO_MODE (1 << 17)
+#define A37X0_SPI_SRST (1 << 16)
+#define A37X0_SPI_XFER_START (1 << 15)
+#define A37X0_SPI_XFER_STOP (1 << 14)
+#define A37X0_SPI_INSTR_PIN (1 << 13)
+#define A37X0_SPI_ADDR_PIN (1 << 12)
+#define A37X0_SPI_DATA_PIN_MASK 0x3
+#define A37X0_SPI_DATA_PIN_SHIFT 10
+#define A37X0_SPI_FIFO_FLUSH (1 << 9)
+#define A37X0_SPI_RW_EN (1 << 8)
+#define A37X0_SPI_CLK_POL (1 << 7)
+#define A37X0_SPI_CLK_PHASE (1 << 6)
+#define A37X0_SPI_BYTE_LEN (1 << 5)
+#define A37X0_SPI_PSC_MASK 0x1f
+#define A37X0_SPI_DATA_OUT 0x8
+#define A37X0_SPI_DATA_IN 0xc
+#define A37X0_SPI_INTR_STAT 0x28
+#define A37X0_SPI_INTR_MASK 0x2c
+#define A37X0_SPI_RDY (1 << 1)
+#define A37X0_SPI_XFER_DONE (1 << 0)
+
+static struct ofw_compat_data compat_data[] = {
+ { "marvell,armada-3700-spi", 1 },
+ { NULL, 0 }
+};
+
+static void a37x0_spi_intr(void *);
+
+static int
+a37x0_spi_wait(struct a37x0_spi_softc *sc, int timeout, uint32_t reg,
+ uint32_t mask)
+{
+ int i;
+
+ for (i = 0; i < timeout; i++) {
+ if ((A37X0_SPI_READ(sc, reg) & mask) == 0)
+ return (0);
+ DELAY(100);
+ }
+
+ return (ETIMEDOUT);
+}
+
+static int
+a37x0_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, "Armada 37x0 SPI controller");
+
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+a37x0_spi_attach(device_t dev)
+{
+ int err, rid;
+ pcell_t maxfreq;
+ struct a37x0_spi_softc *sc;
+ 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);
+ }
+
+ /* Make sure that no CS is asserted. */
+ reg = A37X0_SPI_READ(sc, A37X0_SPI_CONTROL);
+ A37X0_SPI_WRITE(sc, A37X0_SPI_CONTROL, reg & ~A37X0_SPI_CS_MASK);
+
+ /* Reset FIFO. */
+ reg = A37X0_SPI_READ(sc, A37X0_SPI_CONF);
+ A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg | A37X0_SPI_FIFO_FLUSH);
+ err = a37x0_spi_wait(sc, 20, A37X0_SPI_CONF, A37X0_SPI_FIFO_FLUSH);
+ if (err != 0) {
+ 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 flush the controller fifo.\n");
+ return (ENXIO);
+ }
+
+ /* Reset the Controller. */
+ reg = A37X0_SPI_READ(sc, A37X0_SPI_CONF);
+ A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg | A37X0_SPI_SRST);
+ DELAY(1000);
+ /* Enable the single byte IO, disable FIFO. */
+ reg &= ~(A37X0_SPI_FIFO_MODE | A37X0_SPI_BYTE_LEN);
+ A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg);
+
+ /* Disable and clear interrupts. */
+ A37X0_SPI_WRITE(sc, A37X0_SPI_INTR_MASK, 0);
+ reg = A37X0_SPI_READ(sc, A37X0_SPI_INTR_STAT);
+ A37X0_SPI_WRITE(sc, A37X0_SPI_INTR_STAT, reg);
+
+ /* Hook up our interrupt handler. */
+ if (bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
+ NULL, a37x0_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, "a37x0_spi", NULL, MTX_DEF);
+
+ /* Read the controller max-frequency. */
+ if (OF_getencprop(ofw_bus_get_node(dev), "spi-max-frequency", &maxfreq,
+ sizeof(maxfreq)) == -1)
+ maxfreq = 0;
+ sc->sc_maxfreq = maxfreq;
+
+ 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
+a37x0_spi_detach(device_t dev)
+{
+ struct a37x0_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
+a37x0_spi_rx_byte(struct a37x0_spi_softc *sc)
+{
+ struct spi_command *cmd;
+ uint32_t read;
+ uint8_t *p;
+
+ if (sc->sc_read == sc->sc_len)
+ return;
+ 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] = A37X0_SPI_READ(sc, A37X0_SPI_DATA_IN) & 0xff;
+}
+
+static __inline void
+a37x0_spi_tx_byte(struct a37x0_spi_softc *sc)
+{
+ struct spi_command *cmd;
+ uint32_t written;
+ uint8_t *p;
+
+ if (sc->sc_written == sc->sc_len)
+ return;
+ 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;
+ }
+ A37X0_SPI_WRITE(sc, A37X0_SPI_DATA_OUT, p[written]);
+}
+
+static __inline void
+a37x0_spi_set_clock(struct a37x0_spi_softc *sc, uint32_t clock)
+{
+ uint32_t psc, reg;
+
+ if (sc->sc_maxfreq > 0 && clock > sc->sc_maxfreq)
+ clock = sc->sc_maxfreq;
+ psc = A37X0_SPI_CLOCK / clock;
+ if ((A37X0_SPI_CLOCK % clock) > 0)
+ psc++;
+ reg = A37X0_SPI_READ(sc, A37X0_SPI_CONF);
+ reg &= ~A37X0_SPI_PSC_MASK;
+ reg |= psc & A37X0_SPI_PSC_MASK;
+ A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg);
+}
+
+static __inline void
+a37x0_spi_set_pins(struct a37x0_spi_softc *sc, uint32_t npins)
+{
+ uint32_t reg;
+
+ /* Sets single, dual or quad SPI mode. */
+ reg = A37X0_SPI_READ(sc, A37X0_SPI_CONF);
+ reg &= ~(A37X0_SPI_DATA_PIN_MASK << A37X0_SPI_DATA_PIN_SHIFT);
+ reg |= (npins / 2) << A37X0_SPI_DATA_PIN_SHIFT;
+ reg |= A37X0_SPI_INSTR_PIN | A37X0_SPI_ADDR_PIN;
+ A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg);
+}
+
+static __inline void
+a37x0_spi_set_mode(struct a37x0_spi_softc *sc, uint32_t mode)
+{
+ uint32_t reg;
+
+ reg = A37X0_SPI_READ(sc, A37X0_SPI_CONF);
+ switch (mode) {
+ case 0:
+ reg &= ~(A37X0_SPI_CLK_PHASE | A37X0_SPI_CLK_POL);
+ break;
+ case 1:
+ reg &= ~A37X0_SPI_CLK_POL;
+ reg |= A37X0_SPI_CLK_PHASE;
+ break;
+ case 2:
+ reg &= ~A37X0_SPI_CLK_PHASE;
+ reg |= A37X0_SPI_CLK_POL;
+ break;
+ case 3:
+ reg |= (A37X0_SPI_CLK_PHASE | A37X0_SPI_CLK_POL);
+ break;
+ }
+ A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg);
+}
+
+static void
+a37x0_spi_intr(void *arg)
+{
+ struct a37x0_spi_softc *sc;
+ uint32_t status;
+
+ sc = (struct a37x0_spi_softc *)arg;
+ A37X0_SPI_LOCK(sc);
+
+ /* Filter stray interrupts. */
+ if ((sc->sc_flags & A37X0_SPI_BUSY) == 0) {
+ A37X0_SPI_UNLOCK(sc);
+ return;
+ }
+
+ status = A37X0_SPI_READ(sc, A37X0_SPI_INTR_STAT);
+ if (status & A37X0_SPI_XFER_DONE)
+ a37x0_spi_rx_byte(sc);
+
+ /* Clear the interrupt status. */
+ A37X0_SPI_WRITE(sc, A37X0_SPI_INTR_STAT, status);
+
+ /* Check for end of transfer. */
+ if (sc->sc_written == sc->sc_len && sc->sc_read == sc->sc_len)
+ wakeup(sc->sc_dev);
+ else
+ a37x0_spi_tx_byte(sc);
+
+ A37X0_SPI_UNLOCK(sc);
+}
+
+static int
+a37x0_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
+{
+ int timeout;
+ struct a37x0_spi_softc *sc;
+ uint32_t clock, cs, mode, reg;
+
+ 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 data for this child. */
+ spibus_get_cs(child, &cs);
+ cs &= ~SPIBUS_CS_HIGH;
+ if (cs > 3) {
+ device_printf(dev,
+ "Invalid CS %d requested by %s\n", cs,
+ device_get_nameunit(child));
+ return (EINVAL);
+ }
+ spibus_get_clock(child, &clock);
+ if (clock == 0) {
+ device_printf(dev,
+ "Invalid clock %uHz requested by %s\n", clock,
+ device_get_nameunit(child));
+ return (EINVAL);
+ }
+ spibus_get_mode(child, &mode);
+ if (mode > 3) {
+ device_printf(dev,
+ "Invalid mode %u requested by %s\n", mode,
+ device_get_nameunit(child));
+ return (EINVAL);
+ }
+
+ sc = device_get_softc(dev);
+ A37X0_SPI_LOCK(sc);
+
+ /* Wait until the controller is free. */
+ while (sc->sc_flags & A37X0_SPI_BUSY)
+ mtx_sleep(dev, &sc->sc_mtx, 0, "a37x0_spi", 0);
+
+ /* Now we have control over SPI controller. */
+ sc->sc_flags = A37X0_SPI_BUSY;
+
+ /* Set transfer mode and clock. */
+ a37x0_spi_set_mode(sc, mode);
+ a37x0_spi_set_pins(sc, 1);
+ a37x0_spi_set_clock(sc, clock);
+
+ /* Set CS. */
+ A37X0_SPI_WRITE(sc, A37X0_SPI_CONTROL, 1 << (A37X0_SPI_CS_SHIFT + cs));
+
+ /* 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;
+
+ /* Clear interrupts. */
+ reg = A37X0_SPI_READ(sc, A37X0_SPI_INTR_STAT);
+ A37X0_SPI_WRITE(sc, A37X0_SPI_INTR_STAT, reg);
+
+ while ((sc->sc_len - sc->sc_written) > 0) {
+ /*
+ * Write to start the transmission and read the byte
+ * back when ready.
+ */
+ a37x0_spi_tx_byte(sc);
+ timeout = 1000;
+ while (--timeout > 0) {
+ reg = A37X0_SPI_READ(sc, A37X0_SPI_CONTROL);
+ if (reg & A37X0_SPI_XFER_DONE)
+ break;
+ DELAY(1);
+ }
+ if (timeout == 0)
+ break;
+ a37x0_spi_rx_byte(sc);
+ }
+
+ /* Stop the controller. */
+ reg = A37X0_SPI_READ(sc, A37X0_SPI_CONTROL);
+ A37X0_SPI_WRITE(sc, A37X0_SPI_CONTROL, reg & ~A37X0_SPI_CS_MASK);
+ A37X0_SPI_WRITE(sc, A37X0_SPI_INTR_MASK, 0);
+
+ /* Release the controller and wakeup the next thread waiting for it. */
+ sc->sc_flags = 0;
+ wakeup_one(dev);
+ A37X0_SPI_UNLOCK(sc);
+
+ return ((timeout == 0) ? EIO : 0);
+}
+
+static phandle_t
+a37x0_spi_get_node(device_t bus, device_t dev)
+{
+
+ return (ofw_bus_get_node(bus));
+}
+
+static device_method_t a37x0_spi_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, a37x0_spi_probe),
+ DEVMETHOD(device_attach, a37x0_spi_attach),
+ DEVMETHOD(device_detach, a37x0_spi_detach),
+
+ /* SPI interface */
+ DEVMETHOD(spibus_transfer, a37x0_spi_transfer),
+
+ /* ofw_bus interface */
+ DEVMETHOD(ofw_bus_get_node, a37x0_spi_get_node),
+
+ DEVMETHOD_END
+};
+
+static devclass_t a37x0_spi_devclass;
+
+static driver_t a37x0_spi_driver = {
+ "spi",
+ a37x0_spi_methods,
+ sizeof(struct a37x0_spi_softc),
+};
+
+DRIVER_MODULE(a37x0_spi, simplebus, a37x0_spi_driver, a37x0_spi_devclass, 0,
0);
Modified: head/sys/arm64/conf/GENERIC
==============================================================================
--- head/sys/arm64/conf/GENERIC Fri Dec 6 11:48:22 2019 (r355443)
+++ head/sys/arm64/conf/GENERIC Fri Dec 6 12:55:39 2019 (r355444)
@@ -288,6 +288,7 @@ device mv_thermal # Marvell Thermal
Sensor Controller
# SPI
device spibus
+device a37x0_spi # Marvell Armada 37x0 SPI Controller
device bcm2835_spi # Broadcom BCM283x SPI bus
device rk_spi # RockChip SPI controller
Modified: head/sys/conf/files.arm64
==============================================================================
--- head/sys/conf/files.arm64 Fri Dec 6 11:48:22 2019 (r355443)
+++ head/sys/conf/files.arm64 Fri Dec 6 12:55:39 2019 (r355444)
@@ -108,6 +108,7 @@ arm/broadcom/bcm2835/bcm2836.c
optional soc_brcm_bcm
arm/broadcom/bcm2835/bcm283x_dwc_fdt.c optional dwcotg fdt
soc_brcm_bcm2837 | dwcotg fdt soc_brcm_bcm2838
arm/mv/a37x0_gpio.c optional a37x0_gpio gpio fdt
arm/mv/a37x0_iic.c optional a37x0_iic iicbus fdt
+arm/mv/a37x0_spi.c optional a37x0_spi spibus fdt
arm/mv/armada38x/armada38x_rtc.c optional mv_rtc fdt
arm/mv/gpio.c optional mv_gpio fdt
arm/mv/mvebu_pinctrl.c optional mvebu_pinctrl fdt
_______________________________________________
svn-src-head@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
