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[src/trunk]: src/sys/arch Add sun6i SPI driver.
details: https://anonhg.NetBSD.org/src/rev/85f376547234
branches: trunk
changeset: 829437:85f376547234
user: jakllsch <jakllsch%NetBSD.org@localhost>
date: Wed Jan 31 16:24:11 2018 +0000
description:
Add sun6i SPI driver.
Currently PIO-only.
diffstat:
sys/arch/arm/sunxi/files.sunxi | 7 +-
sys/arch/arm/sunxi/sun6i_spi.c | 424 +++++++++++++++++++++++++++++++++++++++++
sys/arch/evbarm/conf/SUNXI | 6 +-
3 files changed, 435 insertions(+), 2 deletions(-)
diffs (truncated from 470 to 300 lines):
diff -r 88702a4179c5 -r 85f376547234 sys/arch/arm/sunxi/files.sunxi
--- a/sys/arch/arm/sunxi/files.sunxi Wed Jan 31 16:00:03 2018 +0000
+++ b/sys/arch/arm/sunxi/files.sunxi Wed Jan 31 16:24:11 2018 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.sunxi,v 1.38 2017/11/10 00:09:23 jmcneill Exp $
+# $NetBSD: files.sunxi,v 1.39 2018/01/31 16:24:11 jakllsch Exp $
#
# Configuration info for Allwinner sunxi family SoCs
#
@@ -227,6 +227,11 @@
attach sunxinand at fdt with sunxi_nand
file arch/arm/sunxi/sunxi_nand.c sunxi_nand
+# SPI Controller (sun6i-compatible)
+device sun6ispi: spibus
+attach sun6ispi at fdt with sun6i_spi
+file arch/arm/sunxi/sun6i_spi.c sun6i_spi
+
# SOC parameters
defflag opt_soc.h SOC_SUNXI
defflag opt_soc.h SOC_SUN4I: SOC_SUNXI
diff -r 88702a4179c5 -r 85f376547234 sys/arch/arm/sunxi/sun6i_spi.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/sunxi/sun6i_spi.c Wed Jan 31 16:24:11 2018 +0000
@@ -0,0 +1,424 @@
+/* $NetBSD: sun6i_spi.c,v 1.1 2018/01/31 16:24:11 jakllsch Exp $ */
+
+/*
+ * Copyright (c) 2018 Jonathan A. Kollasch
+ * 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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>
+__KERNEL_RCSID(0, "$NetBSD: sun6i_spi.c,v 1.1 2018/01/31 16:24:11 jakllsch Exp $");
+
+#include <sys/param.h>
+#include <sys/device.h>
+#include <sys/systm.h>
+#include <sys/mutex.h>
+#include <sys/bus.h>
+#include <sys/intr.h>
+#include <sys/kernel.h>
+
+#include <sys/bitops.h>
+#include <dev/spi/spivar.h>
+
+#include <arm/sunxi/sun6i_spireg.h>
+
+#include <dev/fdt/fdtvar.h>
+
+#include <arm/fdt/arm_fdtvar.h>
+
+#define SPI_IER_DEFAULT (SPI_IER_TC_INT_EN | SPI_IER_TF_UDR_INT_EN | \
+ SPI_IER_TF_OVF_INT_EN | SPI_IER_RF_UDR_INT_EN | SPI_IER_RF_OVF_INT_EN)
+
+struct sun6ispi_softc {
+ device_t sc_dev;
+ bus_space_tag_t sc_iot;
+ bus_space_handle_t sc_ioh;
+ void *sc_intrh;
+ struct spi_controller sc_spi;
+ SIMPLEQ_HEAD(,spi_transfer) sc_q;
+ struct spi_transfer *sc_transfer;
+ struct spi_chunk *sc_wchunk;
+ struct spi_chunk *sc_rchunk;
+ uint32_t sc_TCR;
+ u_int sc_modclkrate;
+ volatile bool sc_running;
+};
+
+static int sun6ispi_match(device_t, cfdata_t, void *);
+static void sun6ispi_attach(device_t, device_t, void *);
+
+static int sun6ispi_configure(void *, int, int, int);
+static int sun6ispi_transfer(void *, struct spi_transfer *);
+
+static void sun6ispi_start(struct sun6ispi_softc * const);
+static int sun6ispi_intr(void *);
+
+static void sun6ispi_send(struct sun6ispi_softc * const);
+static void sun6ispi_recv(struct sun6ispi_softc * const);
+
+CFATTACH_DECL_NEW(sun6i_spi, sizeof(struct sun6ispi_softc),
+ sun6ispi_match, sun6ispi_attach, NULL, NULL);
+
+static int
+sun6ispi_match(device_t parent, cfdata_t cf, void *aux)
+{
+ const char * const compatible[] = {
+ "allwinner,sun8i-h3-spi",
+ NULL
+ };
+ struct fdt_attach_args * const faa = aux;
+
+ return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+sun6ispi_attach(device_t parent, device_t self, void *aux)
+{
+ struct sun6ispi_softc * const sc = device_private(self);
+ struct fdt_attach_args * const faa = aux;
+ struct spibus_attach_args sba;
+ struct fdtbus_reset *rst;
+ struct clk *clk, *modclk;
+ uint32_t gcr, isr;
+ char intrstr[128];
+
+ aprint_naive("\n");
+ aprint_normal(": SPI\n");
+
+ sc->sc_dev = self;
+ sc->sc_iot = faa->faa_bst;
+ SIMPLEQ_INIT(&sc->sc_q);
+
+ const int phandle = faa->faa_phandle;
+ bus_addr_t addr;
+ bus_size_t size;
+
+ if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
+ aprint_error_dev(sc->sc_dev, "missing 'reg' property\n");
+ return;
+ }
+
+ if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh) != 0) {
+ aprint_error_dev(sc->sc_dev, "unable to map device\n");
+ return;
+ }
+
+ if ((clk = fdtbus_clock_get_index(phandle, 0)) != NULL) {
+ if (clk_enable(clk) != 0) {
+ aprint_error_dev(sc->sc_dev, "couldn't enable clock\n");
+ return;
+ }
+ device_printf(self, "%s ahb @ %uHz\n", __func__, clk_get_rate(clk));
+ }
+
+ if ((modclk = fdtbus_clock_get(phandle, "mod")) != NULL) {
+ /* 200MHz max on H3,H5 */
+ if (clk_set_rate(modclk, 200000000) != 0) {
+ aprint_error_dev(sc->sc_dev, "couldn't configure module clock\n");
+ return;
+ }
+ if (clk_enable(modclk) != 0) {
+ aprint_error_dev(sc->sc_dev, "couldn't enable module clock\n");
+ return;
+ }
+ sc->sc_modclkrate = clk_get_rate(modclk);
+ device_printf(self, "%s %uHz\n", __func__, sc->sc_modclkrate);
+ }
+
+ if ((rst = fdtbus_reset_get_index(phandle, 0)) != NULL)
+ if (fdtbus_reset_deassert(rst) != 0) {
+ aprint_error(": couldn't de-assert reset\n");
+ return;
+ }
+
+ isr = bus_space_read_4(sc->sc_iot, sc->sc_ioh, SPI_INT_STA);
+ bus_space_write_4(sc->sc_iot, sc->sc_ioh, SPI_INT_STA, isr);
+
+ if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
+ aprint_error(": failed to decode interrupt\n");
+ return;
+ }
+
+ sc->sc_intrh = fdtbus_intr_establish(phandle, 0, IPL_VM, 0,
+ sun6ispi_intr, sc);
+ if (sc->sc_intrh == NULL) {
+ aprint_error_dev(sc->sc_dev, "unable to establish interrupt\n");
+ return;
+ }
+ aprint_normal_dev(self, "interrupting on %s\n", intrstr);
+
+ gcr = SPI_GCR_SRST;
+ bus_space_write_4(sc->sc_iot, sc->sc_ioh, SPI_GCR, gcr);
+ do {
+ } while ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, SPI_GCR) & SPI_GCR_SRST) != 0);
+ gcr = SPI_GCR_TP_EN | SPI_GCR_MODE | SPI_GCR_EN;
+ bus_space_write_4(sc->sc_iot, sc->sc_ioh, SPI_GCR, gcr);
+
+ bus_space_write_4(sc->sc_iot, sc->sc_ioh, SPI_IER, SPI_IER_DEFAULT);
+
+ sc->sc_spi.sct_cookie = sc;
+ sc->sc_spi.sct_configure = sun6ispi_configure;
+ sc->sc_spi.sct_transfer = sun6ispi_transfer;
+ sc->sc_spi.sct_nslaves = 4;
+
+ sba.sba_controller = &sc->sc_spi;
+
+ (void) config_found_ia(self, "spibus", &sba, spibus_print);
+}
+
+static int
+sun6ispi_configure(void *cookie, int slave, int mode, int speed)
+{
+ struct sun6ispi_softc * const sc = cookie;
+ uint32_t tcr, cctl;
+
+#if 0
+ device_printf(sc->sc_dev, "%s slave %d mode %d speed %d\n", __func__, slave, mode, speed);
+
+ if (speed > 200000)
+ speed = 200000;
+#endif
+
+ tcr = SPI_TCR_SS_LEVEL | SPI_TCR_SPOL;
+
+ if (slave > 3)
+ return EINVAL;
+
+ if (speed <= 0)
+ return EINVAL;
+
+ switch (mode) {
+ case SPI_MODE_0:
+ tcr |= 0;
+ break;
+ case SPI_MODE_1:
+ tcr |= SPI_TCR_CPHA;
+ break;
+ case SPI_MODE_2:
+ tcr |= SPI_TCR_CPOL;
+ break;
+ case SPI_MODE_3:
+ tcr |= SPI_TCR_CPHA|SPI_TCR_CPOL;
+ break;
+ default:
+ return EINVAL;
+ }
+
+ sc->sc_TCR = tcr;
+
+ if (speed < 3000 || speed > 200000000)
+ return EINVAL;
+
+ if (speed > sc->sc_modclkrate / 2 || speed < sc->sc_modclkrate / 512) {
+ for (cctl = 0; cctl <= __SHIFTOUT_MASK(SPI_CCTL_CDR1); cctl++) {
+ if ((sc->sc_modclkrate / (1<<cctl)) <= speed)
+ goto cdr1_found;
+ }
+ return EINVAL;
+cdr1_found:
+ cctl = __SHIFTIN(cctl, SPI_CCTL_CDR1);
+ } else {
+ cctl = howmany(sc->sc_modclkrate, 2 * speed) - 1;
+ cctl = SPI_CCTL_DRS|__SHIFTIN(cctl, SPI_CCTL_CDR2);
+ }
+
+ device_printf(sc->sc_dev, "%s CCTL 0x%08x\n", __func__, cctl);
+ bus_space_write_4(sc->sc_iot, sc->sc_ioh, SPI_CCTL, cctl);
+
+ return 0;
+}
+
+static int
+sun6ispi_transfer(void *cookie, struct spi_transfer *st)
+{
+ struct sun6ispi_softc * const sc = cookie;
+ int s;
+
+ s = splbio();
+ spi_transq_enqueue(&sc->sc_q, st);
+ if (sc->sc_running == false) {
+ sun6ispi_start(sc);
+ }
+ splx(s);
+ return 0;
+}
+
+static size_t
+chunks_total_count(struct spi_transfer * st)
+{
+ struct spi_chunk *chunk = st->st_chunks;
+ size_t len = 0;
+
+ do {
+ len += chunk->chunk_count;
+ } while ((chunk = chunk->chunk_next) != NULL);
+
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