Author: ian
Date: Mon Feb 26 02:28:32 2018
New Revision: 329999
URL: https://svnweb.freebsd.org/changeset/base/329999
Log:
Add a SPI driver for imx5 and imx6.
It can be compiled into the kernel with "device imx_spi" or loaded as a
module, which is also named "imx_spi".
Added:
head/sys/arm/freescale/imx/imx_spi.c (contents, props changed)
head/sys/modules/imx/imx_spi/
head/sys/modules/imx/imx_spi/Makefile (contents, props changed)
Modified:
head/sys/arm/freescale/imx/files.imx5
head/sys/arm/freescale/imx/files.imx6
head/sys/arm/freescale/imx/imx51_ccm.c
head/sys/arm/freescale/imx/imx6_ccm.c
head/sys/arm/freescale/imx/imx6_ccmreg.h
head/sys/arm/freescale/imx/imx_ccmvar.h
head/sys/modules/imx/Makefile
Modified: head/sys/arm/freescale/imx/files.imx5
==============================================================================
--- head/sys/arm/freescale/imx/files.imx5 Mon Feb 26 02:12:09 2018
(r329998)
+++ head/sys/arm/freescale/imx/files.imx5 Mon Feb 26 02:28:32 2018
(r329999)
@@ -52,3 +52,6 @@ dev/vt/hw/fb/vt_early_fb.c optional vt
# Fast Ethernet Controller
dev/ffec/if_ffec.c optional ffec
+# SPI
+arm/freescale/imx/imx_spi.c optional imx_spi
+
Modified: head/sys/arm/freescale/imx/files.imx6
==============================================================================
--- head/sys/arm/freescale/imx/files.imx6 Mon Feb 26 02:12:09 2018
(r329998)
+++ head/sys/arm/freescale/imx/files.imx6 Mon Feb 26 02:28:32 2018
(r329999)
@@ -22,6 +22,7 @@ arm/freescale/imx/imx_machdep.c standard
arm/freescale/imx/imx_gpt.c optional imx_gpt
arm/freescale/imx/imx_gpio.c optional gpio
arm/freescale/imx/imx_i2c.c optional fsliic
+arm/freescale/imx/imx_spi.c optional imx_spi
arm/freescale/imx/imx6_sdma.c optional fslsdma
arm/freescale/imx/imx6_audmux.c optional sound
arm/freescale/imx/imx6_ssi.c optional sound
Modified: head/sys/arm/freescale/imx/imx51_ccm.c
==============================================================================
--- head/sys/arm/freescale/imx/imx51_ccm.c Mon Feb 26 02:12:09 2018
(r329998)
+++ head/sys/arm/freescale/imx/imx51_ccm.c Mon Feb 26 02:28:32 2018
(r329999)
@@ -621,6 +621,13 @@ imx_ccm_usbphy_enable(device_t dev)
}
uint32_t
+imx_ccm_ecspi_hz(void)
+{
+
+ return (imx51_get_clock(IMX51CLK_CSPI_CLK_ROOT));
+}
+
+uint32_t
imx_ccm_ipg_hz(void)
{
@@ -654,3 +661,4 @@ imx_ccm_ahb_hz(void)
return (imx51_get_clock(IMX51CLK_AHB_CLK_ROOT));
}
+
Modified: head/sys/arm/freescale/imx/imx6_ccm.c
==============================================================================
--- head/sys/arm/freescale/imx/imx6_ccm.c Mon Feb 26 02:12:09 2018
(r329998)
+++ head/sys/arm/freescale/imx/imx6_ccm.c Mon Feb 26 02:28:32 2018
(r329999)
@@ -96,8 +96,9 @@ ccm_init_gates(struct ccm_softc *sc)
reg = CCGR0_AIPS_TZ1 | CCGR0_AIPS_TZ2 | CCGR0_ABPHDMA;
WR4(sc, CCM_CCGR0, reg);
- /* enet, epit, gpt */
- reg = CCGR1_ENET | CCGR1_EPIT1 | CCGR1_GPT;
+ /* enet, epit, gpt, spi */
+ reg = CCGR1_ENET | CCGR1_EPIT1 | CCGR1_GPT | CCGR1_ECSPI1 |
+ CCGR1_ECSPI2 | CCGR1_ECSPI3 | CCGR1_ECSPI4 | CCGR1_ECSPI5;
WR4(sc, CCM_CCGR1, reg);
/* ipmux & ipsync (bridges), iomux, i2c */
@@ -349,6 +350,13 @@ imx6_ccm_sata_enable(void)
WR4(ccm_sc, CCM_ANALOG_PLL_ENET, v);
return 0;
+}
+
+uint32_t
+imx_ccm_ecspi_hz(void)
+{
+
+ return (60000000);
}
uint32_t
Modified: head/sys/arm/freescale/imx/imx6_ccmreg.h
==============================================================================
--- head/sys/arm/freescale/imx/imx6_ccmreg.h Mon Feb 26 02:12:09 2018
(r329998)
+++ head/sys/arm/freescale/imx/imx6_ccmreg.h Mon Feb 26 02:28:32 2018
(r329999)
@@ -80,9 +80,15 @@
#define CCGR0_AIPS_TZ2 (0x3 << 2)
#define CCGR0_ABPHDMA (0x3 << 4)
#define CCM_CCGR1 0x06C
+#define CCGR1_ECSPI1 (0x3 << 0)
+#define CCGR1_ECSPI2 (0x3 << 2)
+#define CCGR1_ECSPI3 (0x3 << 4)
+#define CCGR1_ECSPI4 (0x3 << 6)
+#define CCGR1_ECSPI5 (0x3 << 8)
#define CCGR1_ENET (0x3 << 10)
#define CCGR1_EPIT1 (0x3 << 12)
#define CCGR1_EPIT2 (0x3 << 14)
+#define CCGR1_ESAI (0x3 << 16)
#define CCGR1_GPT (0x3 << 20)
#define CCGR1_GPT_SERIAL (0x3 << 22)
#define CCM_CCGR2 0x070
Modified: head/sys/arm/freescale/imx/imx_ccmvar.h
==============================================================================
--- head/sys/arm/freescale/imx/imx_ccmvar.h Mon Feb 26 02:12:09 2018
(r329998)
+++ head/sys/arm/freescale/imx/imx_ccmvar.h Mon Feb 26 02:28:32 2018
(r329999)
@@ -43,6 +43,7 @@
* board setup code has to handle those things.
*/
+uint32_t imx_ccm_ecspi_hz(void);
uint32_t imx_ccm_ipg_hz(void);
uint32_t imx_ccm_perclk_hz(void);
uint32_t imx_ccm_sdhci_hz(void);
Added: head/sys/arm/freescale/imx/imx_spi.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/arm/freescale/imx/imx_spi.c Mon Feb 26 02:28:32 2018
(r329999)
@@ -0,0 +1,604 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2018 Ian Lepore <i...@freebsd.org>
+ * 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 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("$FreeBSD$");
+
+/*
+ * Driver for imx Enhanced Configurable SPI; master-mode only.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/gpio.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+#include <machine/bus.h>
+#include <machine/cpu.h>
+#include <machine/intr.h>
+
+#include <arm/freescale/imx/imx_ccmvar.h>
+
+#include <dev/gpio/gpiobusvar.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/ofw/openfirm.h>
+#include <dev/spibus/spi.h>
+#include <dev/spibus/spibusvar.h>
+
+#include "spibus_if.h"
+
+#define ECSPI_RXDATA 0x00
+#define ECSPI_TXDATA 0x04
+#define ECSPI_CTLREG 0x08
+#define CTLREG_BLEN_SHIFT 20
+#define CTLREG_BLEN_MASK 0x0fff
+#define CTLREG_CSEL_SHIFT 18
+#define CTLREG_CSEL_MASK 0x03
+#define CTLREG_DRCTL_SHIFT 16
+#define CTLREG_DRCTL_MASK 0x03
+#define CTLREG_PREDIV_SHIFT 12
+#define CTLREG_PREDIV_MASK 0x0f
+#define CTLREG_POSTDIV_SHIFT 8
+#define CTLREG_POSTDIV_MASK 0x0f
+#define CTLREG_CMODE_SHIFT 4
+#define CTLREG_CMODE_MASK 0x0f
+#define CTLREG_CMODES_MASTER (CTLREG_CMODE_MASK <<
CTLREG_CMODE_SHIFT)
+#define CTLREG_SMC (1u << 3)
+#define CTLREG_XCH (1u << 2)
+#define CTLREG_HT (1u << 1)
+#define CTLREG_EN (1u << 0)
+#define ECSPI_CFGREG 0x0c
+#define CFGREG_HTLEN_SHIFT 24
+#define CFGREG_SCLKCTL_SHIFT 20
+#define CFGREG_DATACTL_SHIFT 16
+#define CFGREG_SSPOL_SHIFT 12
+#define CFGREG_SSCTL_SHIFT 8
+#define CFGREG_SCLKPOL_SHIFT 4
+#define CFGREG_SCLKPHA_SHIFT 0
+#define CFGREG_MASK 0x0f /* all CFGREG fields are 4 bits
*/
+#define ECSPI_INTREG 0x10
+#define INTREG_TCEN (1u << 7)
+#define INTREG_ROEN (1u << 6)
+#define INTREG_RFEN (1u << 5)
+#define INTREG_RDREN (1u << 4)
+#define INTREG_RREN (1u << 3)
+#define INTREG_TFEN (1u << 2)
+#define INTREG_TDREN (1u << 1)
+#define INTREG_TEEN (1u << 0)
+#define ECSPI_DMAREG 0x14
+#define DMA_RX_THRESH_SHIFT 16
+#define DMA_RX_THRESH_MASK 0x3f
+#define DMA_TX_THRESH_SHIFT 0
+#define DMA_TX_THRESH_MASK 0x3f
+#define ECSPI_STATREG 0x18
+#define SREG_TC (1u << 7)
+#define SREG_RO (1u << 6)
+#define SREG_RF (1u << 5)
+#define SREG_RDR (1u << 4)
+#define SREG_RR (1u << 3)
+#define SREG_TF (1u << 2)
+#define SREG_TDR (1u << 1)
+#define SREG_TE (1u << 0)
+#define ECSPI_PERIODREG 0x1c
+#define ECSPI_TESTREG 0x20
+
+#define CS_MAX 4 /* Max number of chip selects. */
+#define CS_MASK 0x03 /* Mask flag bits out of chipsel. */
+
+#define FIFO_SIZE 64
+#define FIFO_RXTHRESH 32
+#define FIFO_TXTHRESH 32
+
+struct spi_softc {
+ device_t dev;
+ device_t spibus;
+ struct mtx mtx;
+ struct resource *memres;
+ struct resource *intres;
+ void *inthandle;
+ gpio_pin_t cspins[CS_MAX];
+ u_int debug;
+ u_int basefreq;
+ uint32_t ctlreg;
+ uint32_t intreg;
+ uint32_t fifocnt;
+ uint8_t *rxbuf;
+ uint32_t rxidx;
+ uint32_t rxlen;
+ uint8_t *txbuf;
+ uint32_t txidx;
+ uint32_t txlen;
+};
+
+static struct ofw_compat_data compat_data[] = {
+ {"fsl,imx51-ecspi", true},
+ {"fsl,imx53-ecspi", true},
+ {"fsl,imx6dl-ecspi", true},
+ {"fsl,imx6q-ecspi", true},
+ {"fsl,imx6sx-ecspi", true},
+ {"fsl,imx6ul-ecspi", true},
+ {NULL, false}
+};
+
+static inline uint32_t
+RD4(struct spi_softc *sc, bus_size_t offset)
+{
+
+ return (bus_read_4(sc->memres, offset));
+}
+
+static inline void
+WR4(struct spi_softc *sc, bus_size_t offset, uint32_t value)
+{
+
+ bus_write_4(sc->memres, offset, value);
+}
+
+static u_int
+spi_calc_clockdiv(struct spi_softc *sc, u_int busfreq)
+{
+ u_int post, pre;
+
+ /* Returning 0 effectively sets both dividers to 1. */
+ if (sc->basefreq <= busfreq)
+ return (0);
+
+ /*
+ * Brute-force this; all real-world bus speeds are going to be found on
+ * the 1st or 2nd time through this loop.
+ */
+ for (post = 0; post < 16; ++post) {
+ pre = ((sc->basefreq >> post) / busfreq) - 1;
+ if (pre < 16)
+ break;
+ }
+ if (post == 16) {
+ /* The lowest we can go is ~115 Hz. */
+ pre = 15;
+ post = 15;
+ }
+
+ if (sc->debug >= 2) {
+ device_printf(sc->dev,
+ "base %u bus %u; pre %u, post %u; actual busfreq %u\n",
+ sc->basefreq, busfreq, pre, post,
+ (sc->basefreq / (pre + 1)) / (1 << post));
+ }
+
+ return (pre << CTLREG_PREDIV_SHIFT) | (post << CTLREG_POSTDIV_SHIFT);
+}
+
+static void
+spi_set_chipsel(struct spi_softc *sc, u_int cs, bool active)
+{
+ bool pinactive;
+
+ /*
+ * This is kinda crazy... the gpio pins for chipsel are defined as
+ * active-high in the dts, but are supposed to be treated as active-low
+ * by this driver. So to turn on chipsel we have to invert the value
+ * passed to gpio_pin_set_active(). Then, to make it more fun, any
+ * slave can say its chipsel is active-high, so if that option is
+ * on, we have to invert the value again.
+ */
+ pinactive = !active ^ (bool)(cs & SPIBUS_CS_HIGH);
+
+ if (sc->debug >= 2) {
+ device_printf(sc->dev, "chipsel %u changed to %u\n",
+ (cs & ~SPIBUS_CS_HIGH), pinactive);
+ }
+
+ /*
+ * Change the pin, then do a dummy read of its current state to ensure
+ * that the state change reaches the hardware before proceeding.
+ */
+ gpio_pin_set_active(sc->cspins[cs & ~SPIBUS_CS_HIGH], pinactive);
+ gpio_pin_is_active(sc->cspins[cs & ~SPIBUS_CS_HIGH], &pinactive);
+}
+
+static void
+spi_hw_setup(struct spi_softc *sc, u_int cs, u_int mode, u_int freq)
+{
+ uint32_t reg;
+
+ /*
+ * Set up control register, and write it first to bring the device out
+ * of reset.
+ */
+ sc->ctlreg = CTLREG_EN | CTLREG_CMODES_MASTER | CTLREG_SMC;
+ sc->ctlreg |= spi_calc_clockdiv(sc, freq);
+ sc->ctlreg |= 7 << CTLREG_BLEN_SHIFT; /* XXX byte at a time */
+ WR4(sc, ECSPI_CTLREG, sc->ctlreg);
+
+ /*
+ * Set up the config register. Note that we do all transfers with the
+ * SPI hardware's chip-select set to zero. The actual chip select is
+ * handled with a gpio pin.
+ */
+ reg = 0;
+ if (cs & SPIBUS_CS_HIGH)
+ reg |= 1u << CFGREG_SSPOL_SHIFT;
+ if (mode & SPIBUS_MODE_CPHA)
+ reg |= 1u << CFGREG_SCLKPHA_SHIFT;
+ if (mode & SPIBUS_MODE_CPOL) {
+ reg |= 1u << CFGREG_SCLKPOL_SHIFT;
+ reg |= 1u << CFGREG_SCLKCTL_SHIFT;
+ }
+ WR4(sc, ECSPI_CFGREG, reg);
+
+ /*
+ * Set up the rx/tx FIFO interrupt thresholds.
+ */
+ reg = (FIFO_RXTHRESH << DMA_RX_THRESH_SHIFT);
+ reg |= (FIFO_TXTHRESH << DMA_TX_THRESH_SHIFT);
+ WR4(sc, ECSPI_DMAREG, reg);
+
+ /*
+ * Do a dummy read, to make sure the preceding writes reach the spi
+ * hardware before we assert any gpio chip select.
+ */
+ (void)RD4(sc, ECSPI_CFGREG);
+}
+
+static void
+spi_empty_rxfifo(struct spi_softc *sc)
+{
+
+ while (sc->rxidx < sc->rxlen && (RD4(sc, ECSPI_STATREG) & SREG_RR)) {
+ sc->rxbuf[sc->rxidx++] = (uint8_t)RD4(sc, ECSPI_RXDATA);
+ --sc->fifocnt;
+ }
+}
+
+static void
+spi_fill_txfifo(struct spi_softc *sc)
+{
+
+ while (sc->txidx < sc->txlen && sc->fifocnt < FIFO_SIZE) {
+ WR4(sc, ECSPI_TXDATA, sc->txbuf[sc->txidx++]);
+ ++sc->fifocnt;
+ }
+
+ /*
+ * If we're out of data, disable tx data ready (threshold) interrupts,
+ * and enable tx fifo empty interrupts.
+ */
+ if (sc->txidx == sc->txlen)
+ sc->intreg = (sc->intreg & ~INTREG_TDREN) | INTREG_TEEN;
+}
+
+static void
+spi_intr(void *arg)
+{
+ struct spi_softc *sc = arg;
+ uint32_t intreg, status;
+
+ mtx_lock(&sc->mtx);
+
+ sc = arg;
+ intreg = sc->intreg;
+ status = RD4(sc, ECSPI_STATREG);
+ WR4(sc, ECSPI_STATREG, status); /* Clear w1c bits. */
+
+ /*
+ * If we get an overflow error, just signal that the transfer is done
+ * and wakeup the waiting thread, which will see that txidx != txlen and
+ * return an IO error to the caller.
+ */
+ if (__predict_false(status & SREG_RO)) {
+ if (sc->debug || bootverbose) {
+ device_printf(sc->dev, "rxoverflow rxidx %u txidx %u\n",
+ sc->rxidx, sc->txidx);
+ }
+ sc->intreg = 0;
+ wakeup(sc);
+ mtx_unlock(&sc->mtx);
+ return;
+ }
+
+ if (status & SREG_RR)
+ spi_empty_rxfifo(sc);
+
+ if (status & SREG_TDR)
+ spi_fill_txfifo(sc);
+
+ /*
+ * If we're out of bytes to send...
+ * - If Transfer Complete is set (shift register is empty) and we've
+ * received everything we expect, we're all done.
+ * - Else if Tx Fifo Empty is set, we need to stop waiting for that and
+ * switch to waiting for Transfer Complete (wait for shift register
+ * to empty out), and also for Receive Ready (last of incoming data).
+ */
+ if (sc->txidx == sc->txlen) {
+ if ((status & SREG_TC) && sc->fifocnt == 0) {
+ sc->intreg = 0;
+ wakeup(sc);
+ } else if (status & SREG_TE) {
+ sc->intreg &= ~(sc->intreg & ~INTREG_TEEN);
+ sc->intreg |= INTREG_TCEN | INTREG_RREN;
+ }
+ }
+
+ /*
+ * If interrupt flags changed, write the new flags to the hardware and
+ * do a dummy readback to ensure the changes reach the hardware before
+ * we exit the isr.
+ */
+ if (sc->intreg != intreg) {
+ WR4(sc, ECSPI_INTREG, sc->intreg);
+ (void)RD4(sc, ECSPI_INTREG);
+ }
+
+ if (sc->debug >= 3) {
+ device_printf(sc->dev,
+ "spi_intr, sreg 0x%08x intreg was 0x%08x now 0x%08x\n",
+ status, intreg, sc->intreg);
+ }
+
+ mtx_unlock(&sc->mtx);
+}
+
+static int
+spi_xfer_buf(struct spi_softc *sc, void *rxbuf, void *txbuf, uint32_t len)
+{
+ int err;
+
+ if (sc->debug >= 1) {
+ device_printf(sc->dev,
+ "spi_xfer_buf, rxbuf %p txbuf %p len %u\n",
+ rxbuf, txbuf, len);
+ }
+
+ if (len == 0)
+ return (0);
+
+ sc->rxbuf = rxbuf;
+ sc->rxlen = len;
+ sc->rxidx = 0;
+ sc->txbuf = txbuf;
+ sc->txlen = len;
+ sc->txidx = 0;
+ sc->intreg = INTREG_RDREN | INTREG_TDREN;
+ spi_fill_txfifo(sc);
+
+ /* Enable interrupts last; spi_fill_txfifo() can change sc->intreg */
+ WR4(sc, ECSPI_INTREG, sc->intreg);
+
+ err = 0;
+ while (err == 0 && sc->intreg != 0)
+ err = msleep(sc, &sc->mtx, 0, "imxspi", 10 * hz);
+
+ if (sc->rxidx != sc->rxlen || sc->txidx != sc->txlen)
+ err = EIO;
+
+ return (err);
+}
+
+static int
+spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
+{
+ struct spi_softc *sc = device_get_softc(dev);
+ uint32_t cs, mode, clock;
+ int err;
+
+ spibus_get_cs(child, &cs);
+ spibus_get_clock(child, &clock);
+ spibus_get_mode(child, &mode);
+
+ if (cs > CS_MAX || sc->cspins[cs] == NULL) {
+ if (sc->debug || bootverbose)
+ device_printf(sc->dev, "Invalid chip select %u\n", cs);
+ return (EINVAL);
+ }
+
+ mtx_lock(&sc->mtx);
+
+ if (sc->debug >= 1) {
+ device_printf(sc->dev,
+ "spi_transfer, cs 0x%x clock %u mode %u\n",
+ cs, clock, mode);
+ }
+
+ /* Set up the hardware and select the device. */
+ spi_hw_setup(sc, cs, mode, clock);
+ spi_set_chipsel(sc, cs, true);
+
+ /* Transfer command then data bytes. */
+ err = 0;
+ if (cmd->tx_cmd_sz > 0)
+ err = spi_xfer_buf(sc, cmd->rx_cmd, cmd->tx_cmd,
+ cmd->tx_cmd_sz);
+ if (cmd->tx_data_sz > 0 && err == 0)
+ err = spi_xfer_buf(sc, cmd->rx_data, cmd->tx_data,
+ cmd->tx_data_sz);
+
+ /* Deselect the device, turn off (and reset) hardware. */
+ spi_set_chipsel(sc, cs, false);
+ WR4(sc, ECSPI_CTLREG, 0);
+
+ mtx_unlock(&sc->mtx);
+
+ return (err);
+}
+
+static phandle_t
+spi_get_node(device_t bus, device_t dev)
+{
+
+ /*
+ * Share our controller node with our spibus child; it instantiates
+ * devices by walking the children contained within our node.
+ */
+ return ofw_bus_get_node(bus);
+}
+
+static int
+spi_detach(device_t dev)
+{
+ struct spi_softc *sc = device_get_softc(dev);
+ int idx;
+
+ mtx_lock(&sc->mtx);
+
+ bus_generic_detach(sc->dev);
+ if (sc->spibus != NULL)
+ device_delete_child(dev, sc->spibus);
+
+ for (idx = 0; idx < nitems(sc->cspins); ++idx) {
+ if (sc->cspins[idx] != NULL)
+ gpio_pin_release(sc->cspins[idx]);
+ }
+
+ if (sc->inthandle != NULL)
+ bus_teardown_intr(sc->dev, sc->intres, sc->inthandle);
+ if (sc->intres != NULL)
+ bus_release_resource(sc->dev, SYS_RES_IRQ, 0, sc->intres);
+ if (sc->memres != NULL)
+ bus_release_resource(sc->dev, SYS_RES_MEMORY, 0, sc->memres);
+
+ mtx_unlock(&sc->mtx);
+ mtx_destroy(&sc->mtx);
+
+ return (0);
+}
+
+static int
+spi_attach(device_t dev)
+{
+ struct spi_softc *sc = device_get_softc(dev);
+ phandle_t node;
+ int err, idx, rid;
+
+ sc->dev = dev;
+ sc->basefreq = imx_ccm_ecspi_hz();
+
+ mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF);
+
+ /* Set up debug-enable sysctl. */
+ SYSCTL_ADD_INT(device_get_sysctl_ctx(sc->dev),
+ SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)),
+ OID_AUTO, "debug", CTLFLAG_RWTUN, &sc->debug, 0,
+ "Enable debug, higher values = more info");
+
+ /* Allocate mmio register access resources. */
+ rid = 0;
+ sc->memres = bus_alloc_resource_any(sc->dev, SYS_RES_MEMORY, &rid,
+ RF_ACTIVE);
+ if (sc->memres == NULL) {
+ device_printf(sc->dev, "could not allocate registers\n");
+ spi_detach(sc->dev);
+ return (ENXIO);
+ }
+
+ /* Allocate interrupt resources and set up handler. */
+ rid = 0;
+ sc->intres = bus_alloc_resource_any(sc->dev, SYS_RES_IRQ, &rid,
+ RF_ACTIVE);
+ if (sc->intres == NULL) {
+ device_printf(sc->dev, "could not allocate interrupt\n");
+ device_detach(sc->dev);
+ return (ENXIO);
+ }
+ err = bus_setup_intr(sc->dev, sc->intres, INTR_TYPE_MISC | INTR_MPSAFE,
+ NULL, spi_intr, sc, &sc->inthandle);
+ if (err != 0) {
+ device_printf(sc->dev, "could not setup interrupt handler");
+ device_detach(sc->dev);
+ return (ENXIO);
+ }
+
+ /* Allocate gpio pins for configured chip selects. */
+ node = ofw_bus_get_node(sc->dev);
+ for (err = 0, idx = 0; err == 0 && idx < nitems(sc->cspins); ++idx) {
+ err = gpio_pin_get_by_ofw_propidx(sc->dev, node, "cs-gpios",
+ idx, &sc->cspins[idx]);
+ if (err == 0) {
+ gpio_pin_setflags(sc->cspins[idx], GPIO_PIN_OUTPUT);
+ } else if (sc->debug >= 2) {
+ device_printf(sc->dev,
+ "cannot configure gpio for chip select %u\n", idx);
+ }
+ }
+
+ /*
+ * Hardware init: put all channels into Master mode, turn off the enable
+ * bit (gates off clocks); we only enable the hardware while xfers run.
+ */
+ WR4(sc, ECSPI_CTLREG, CTLREG_CMODES_MASTER);
+
+ /* Attach the bus driver. */
+ sc->spibus = device_add_child(dev, "spibus", -1);
+ return (bus_generic_attach(sc->dev));
+}
+
+static int
+spi_probe(device_t dev)
+{
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
+ return (ENXIO);
+
+ device_set_desc(dev, "i.MX ECSPI Master");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static device_method_t spi_methods[] = {
+ DEVMETHOD(device_probe, spi_probe),
+ DEVMETHOD(device_attach, spi_attach),
+ DEVMETHOD(device_detach, spi_detach),
+
+ /* spibus_if */
+ DEVMETHOD(spibus_transfer, spi_transfer),
+
+ /* ofw_bus_if */
+ DEVMETHOD(ofw_bus_get_node, spi_get_node),
+
+ DEVMETHOD_END
+};
+
+static driver_t spi_driver = {
+ "imx_spi",
+ spi_methods,
+ sizeof(struct spi_softc),
+};
+
+static devclass_t spi_devclass;
+
+DRIVER_MODULE(imx_spi, simplebus, spi_driver, spi_devclass, 0, 0);
+DRIVER_MODULE(ofw_spibus, imx_spi, ofw_spibus_driver, ofw_spibus_devclass, 0,
0);
+MODULE_DEPEND(imx_spi, ofw_spibus, 1, 1, 1);
Modified: head/sys/modules/imx/Makefile
==============================================================================
--- head/sys/modules/imx/Makefile Mon Feb 26 02:12:09 2018
(r329998)
+++ head/sys/modules/imx/Makefile Mon Feb 26 02:28:32 2018
(r329999)
@@ -4,5 +4,6 @@
SUBDIR = \
../ffec \
imx_i2c \
+ imx_spi \
.include <bsd.subdir.mk>
Added: head/sys/modules/imx/imx_spi/Makefile
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/modules/imx/imx_spi/Makefile Mon Feb 26 02:28:32 2018
(r329999)
@@ -0,0 +1,16 @@
+# $FreeBSD$
+
+.PATH: ${SRCTOP}/sys/arm/freescale/imx
+
+KMOD= imx_spi
+SRCS= imx_spi.c
+
+# Generated files...
+SRCS+= \
+ bus_if.h \
+ device_if.h \
+ ofw_bus_if.h \
+ opt_platform.h \
+ spibus_if.h \
+
+.include <bsd.kmod.mk>
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