svn commit: r267507 - head/sys/arm/freescale/vybrid
Ruslan Bukin
br at FreeBSD.org
Sun Jun 15 12:08:34 UTC 2014
Author: br
Date: Sun Jun 15 12:08:33 2014
New Revision: 267507
URL: http://svnweb.freebsd.org/changeset/base/267507
Log:
Add very basic driver for 12-bit Analog to Digital Converter (ADC).
Added:
head/sys/arm/freescale/vybrid/vf_adc.c (contents, props changed)
head/sys/arm/freescale/vybrid/vf_adc.h (contents, props changed)
Modified:
head/sys/arm/freescale/vybrid/files.vybrid
Modified: head/sys/arm/freescale/vybrid/files.vybrid
==============================================================================
--- head/sys/arm/freescale/vybrid/files.vybrid Sun Jun 15 11:21:44 2014 (r267506)
+++ head/sys/arm/freescale/vybrid/files.vybrid Sun Jun 15 12:08:33 2014 (r267507)
@@ -23,6 +23,7 @@ arm/freescale/vybrid/vf_src.c standard
arm/freescale/vybrid/vf_edma.c standard
arm/freescale/vybrid/vf_dmamux.c standard
arm/freescale/vybrid/vf_port.c standard
+arm/freescale/vybrid/vf_adc.c standard
arm/freescale/vybrid/vf_i2c.c optional iicbus
arm/freescale/vybrid/vf_tcon.c optional vt
arm/freescale/vybrid/vf_dcu4.c optional vt
Added: head/sys/arm/freescale/vybrid/vf_adc.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/arm/freescale/vybrid/vf_adc.c Sun Jun 15 12:08:33 2014 (r267507)
@@ -0,0 +1,245 @@
+/*-
+ * Copyright (c) 2014 Ruslan Bukin <br at bsdpad.com>
+ * 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.
+ */
+
+/*
+ * Vybrid Family 12-bit Analog to Digital Converter (ADC)
+ * Chapter 37, Vybrid Reference Manual, Rev. 5, 07/2013
+ */
+
+#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 <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/fdt.h>
+#include <machine/cpu.h>
+#include <machine/intr.h>
+
+#include <arm/freescale/vybrid/vf_common.h>
+#include <arm/freescale/vybrid/vf_adc.h>
+
+#define ADC_HC0 0x00 /* Ctrl reg for hardware triggers */
+#define ADC_HC1 0x04 /* Ctrl reg for hardware triggers */
+#define HC_AIEN (1 << 7) /* Conversion Complete Int Control */
+#define HC_ADCH_M 0x1f /* Input Channel Select Mask */
+#define HC_ADCH_S 0 /* Input Channel Select Shift */
+#define ADC_HS 0x08 /* Status register for HW triggers */
+#define HS_COCO0 (1 << 0) /* Conversion Complete Flag */
+#define HS_COCO1 (1 << 1) /* Conversion Complete Flag */
+#define ADC_R0 0x0C /* Data result reg for HW triggers */
+#define ADC_R1 0x10 /* Data result reg for HW triggers */
+#define ADC_CFG 0x14 /* Configuration register */
+#define CFG_OVWREN (1 << 16) /* Data Overwrite Enable */
+#define CFG_AVGS_M 0x3 /* Hardware Average select Mask */
+#define CFG_AVGS_S 14 /* Hardware Average select Shift */
+#define CFG_ADTRG (1 << 13) /* Conversion Trigger Select */
+#define CFG_REFSEL_M 0x3 /* Voltage Reference Select Mask */
+#define CFG_REFSEL_S 11 /* Voltage Reference Select Shift */
+#define CFG_ADHSC (1 << 10) /* High Speed Configuration */
+#define CFG_ADSTS_M 0x3 /* Defines the sample time duration */
+#define CFG_ADSTS_S 8 /* Defines the sample time duration */
+#define CFG_ADLPC (1 << 7) /* Low-Power Configuration */
+#define CFG_ADIV_M 0x3 /* Clock Divide Select */
+#define CFG_ADIV_S 5 /* Clock Divide Select */
+#define CFG_ADLSMP (1 << 4) /* Long Sample Time Configuration */
+#define CFG_MODE_M 0x3 /* Conversion Mode Selection Mask */
+#define CFG_MODE_S 2 /* Conversion Mode Selection Shift */
+#define CFG_MODE_12 0x2 /* 12-bit mode */
+#define CFG_ADICLK_M 0x3 /* Input Clock Select Mask */
+#define CFG_ADICLK_S 0 /* Input Clock Select Shift */
+#define ADC_GC 0x18 /* General control register */
+#define GC_CAL (1 << 7) /* Calibration */
+#define GC_ADCO (1 << 6) /* Continuous Conversion Enable */
+#define GC_AVGE (1 << 5) /* Hardware average enable */
+#define GC_ACFE (1 << 4) /* Compare Function Enable */
+#define GC_ACFGT (1 << 3) /* Compare Function Greater Than En */
+#define GC_ACREN (1 << 2) /* Compare Function Range En */
+#define GC_DMAEN (1 << 1) /* DMA Enable */
+#define GC_ADACKEN (1 << 0) /* Asynchronous clock output enable */
+#define ADC_GS 0x1C /* General status register */
+#define GS_AWKST (1 << 2) /* Asynchronous wakeup int status */
+#define GS_CALF (1 << 1) /* Calibration Failed Flag */
+#define GS_ADACT (1 << 0) /* Conversion Active */
+#define ADC_CV 0x20 /* Compare value register */
+#define CV_CV2_M 0xfff /* Compare Value 2 Mask */
+#define CV_CV2_S 16 /* Compare Value 2 Shift */
+#define CV_CV1_M 0xfff /* Compare Value 1 Mask */
+#define CV_CV1_S 0 /* Compare Value 1 Shift */
+#define ADC_OFS 0x24 /* Offset correction value register */
+#define OFS_SIGN 12 /* Sign bit */
+#define OFS_M 0xfff /* Offset value Mask */
+#define OFS_S 0 /* Offset value Shift */
+#define ADC_CAL 0x28 /* Calibration value register */
+#define CAL_CODE_M 0xf /* Calibration Result Value Mask */
+#define CAL_CODE_S 0 /* Calibration Result Value Shift */
+#define ADC_PCTL 0x30 /* Pin control register */
+
+struct adc_softc {
+ struct resource *res[2];
+ bus_space_tag_t bst;
+ bus_space_handle_t bsh;
+ void *ih;
+};
+
+struct adc_softc *adc_sc;
+
+static struct resource_spec adc_spec[] = {
+ { SYS_RES_MEMORY, 0, RF_ACTIVE },
+ { SYS_RES_IRQ, 0, RF_ACTIVE },
+ { -1, 0 }
+};
+
+static int
+adc_probe(device_t dev)
+{
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (!ofw_bus_is_compatible(dev, "fsl,mvf600-adc"))
+ return (ENXIO);
+
+ device_set_desc(dev, "Vybrid Family "
+ "12-bit Analog to Digital Converter");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static void
+adc_intr(void *arg)
+{
+ struct adc_softc *sc;
+
+ sc = arg;
+
+ /* Conversation complete */
+}
+
+uint32_t
+adc_read(void)
+{
+ struct adc_softc *sc;
+
+ sc = adc_sc;
+ if (sc == NULL)
+ return (0);
+
+ return (READ4(sc, ADC_R0));
+}
+
+uint32_t
+adc_enable(int channel)
+{
+ struct adc_softc *sc;
+ int reg;
+
+ sc = adc_sc;
+ if (sc == NULL)
+ return (1);
+
+ reg = READ4(sc, ADC_HC0);
+ reg &= ~(HC_ADCH_M << HC_ADCH_S);
+ reg |= (channel << HC_ADCH_S);
+ WRITE4(sc, ADC_HC0, reg);
+
+ return (0);
+}
+
+static int
+adc_attach(device_t dev)
+{
+ struct adc_softc *sc;
+ int err;
+ int reg;
+
+ sc = device_get_softc(dev);
+
+ if (bus_alloc_resources(dev, adc_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]);
+
+ adc_sc = sc;
+
+ /* Setup interrupt handler */
+ err = bus_setup_intr(dev, sc->res[1], INTR_TYPE_BIO | INTR_MPSAFE,
+ NULL, adc_intr, sc, &sc->ih);
+ if (err) {
+ device_printf(dev, "Unable to alloc interrupt resource.\n");
+ return (ENXIO);
+ }
+
+ /* Configure 12-bit mode */
+ reg = READ4(sc, ADC_CFG);
+ reg &= ~(CFG_MODE_M << CFG_MODE_S);
+ reg |= (CFG_MODE_12 << CFG_MODE_S); /* 12bit */
+ WRITE4(sc, ADC_CFG, reg);
+
+ /* Configure for continuous conversion */
+ reg = READ4(sc, ADC_GC);
+ reg |= (GC_ADCO | GC_AVGE);
+ WRITE4(sc, ADC_GC, reg);
+
+ /* Disable interrupts */
+ reg = READ4(sc, ADC_HC0);
+ reg &= HC_AIEN;
+ WRITE4(sc, ADC_HC0, reg);
+
+ return (0);
+}
+
+static device_method_t adc_methods[] = {
+ DEVMETHOD(device_probe, adc_probe),
+ DEVMETHOD(device_attach, adc_attach),
+ { 0, 0 }
+};
+
+static driver_t adc_driver = {
+ "adc",
+ adc_methods,
+ sizeof(struct adc_softc),
+};
+
+static devclass_t adc_devclass;
+
+DRIVER_MODULE(adc, simplebus, adc_driver, adc_devclass, 0, 0);
Added: head/sys/arm/freescale/vybrid/vf_adc.h
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/arm/freescale/vybrid/vf_adc.h Sun Jun 15 12:08:33 2014 (r267507)
@@ -0,0 +1,30 @@
+/*-
+ * Copyright (c) 2014 Ruslan Bukin <br at bsdpad.com>
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+uint32_t adc_read(void);
+uint32_t adc_enable(int);
More information about the svn-src-head
mailing list