1 /*- 2 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 /* 28 * Vybrid Family 12-bit Analog to Digital Converter (ADC) 29 * Chapter 37, Vybrid Reference Manual, Rev. 5, 07/2013 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/bus.h> 38 #include <sys/kernel.h> 39 #include <sys/module.h> 40 #include <sys/malloc.h> 41 #include <sys/rman.h> 42 #include <sys/timeet.h> 43 #include <sys/timetc.h> 44 45 #include <dev/ofw/openfirm.h> 46 #include <dev/ofw/ofw_bus.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include <machine/bus.h> 50 #include <machine/cpu.h> 51 #include <machine/intr.h> 52 53 #include <arm/freescale/vybrid/vf_common.h> 54 #include <arm/freescale/vybrid/vf_adc.h> 55 56 #define ADC_HC0 0x00 /* Ctrl reg for hardware triggers */ 57 #define ADC_HC1 0x04 /* Ctrl reg for hardware triggers */ 58 #define HC_AIEN (1 << 7) /* Conversion Complete Int Control */ 59 #define HC_ADCH_M 0x1f /* Input Channel Select Mask */ 60 #define HC_ADCH_S 0 /* Input Channel Select Shift */ 61 #define ADC_HS 0x08 /* Status register for HW triggers */ 62 #define HS_COCO0 (1 << 0) /* Conversion Complete Flag */ 63 #define HS_COCO1 (1 << 1) /* Conversion Complete Flag */ 64 #define ADC_R0 0x0C /* Data result reg for HW triggers */ 65 #define ADC_R1 0x10 /* Data result reg for HW triggers */ 66 #define ADC_CFG 0x14 /* Configuration register */ 67 #define CFG_OVWREN (1 << 16) /* Data Overwrite Enable */ 68 #define CFG_AVGS_M 0x3 /* Hardware Average select Mask */ 69 #define CFG_AVGS_S 14 /* Hardware Average select Shift */ 70 #define CFG_ADTRG (1 << 13) /* Conversion Trigger Select */ 71 #define CFG_REFSEL_M 0x3 /* Voltage Reference Select Mask */ 72 #define CFG_REFSEL_S 11 /* Voltage Reference Select Shift */ 73 #define CFG_ADHSC (1 << 10) /* High Speed Configuration */ 74 #define CFG_ADSTS_M 0x3 /* Defines the sample time duration */ 75 #define CFG_ADSTS_S 8 /* Defines the sample time duration */ 76 #define CFG_ADLPC (1 << 7) /* Low-Power Configuration */ 77 #define CFG_ADIV_M 0x3 /* Clock Divide Select */ 78 #define CFG_ADIV_S 5 /* Clock Divide Select */ 79 #define CFG_ADLSMP (1 << 4) /* Long Sample Time Configuration */ 80 #define CFG_MODE_M 0x3 /* Conversion Mode Selection Mask */ 81 #define CFG_MODE_S 2 /* Conversion Mode Selection Shift */ 82 #define CFG_MODE_12 0x2 /* 12-bit mode */ 83 #define CFG_ADICLK_M 0x3 /* Input Clock Select Mask */ 84 #define CFG_ADICLK_S 0 /* Input Clock Select Shift */ 85 #define ADC_GC 0x18 /* General control register */ 86 #define GC_CAL (1 << 7) /* Calibration */ 87 #define GC_ADCO (1 << 6) /* Continuous Conversion Enable */ 88 #define GC_AVGE (1 << 5) /* Hardware average enable */ 89 #define GC_ACFE (1 << 4) /* Compare Function Enable */ 90 #define GC_ACFGT (1 << 3) /* Compare Function Greater Than En */ 91 #define GC_ACREN (1 << 2) /* Compare Function Range En */ 92 #define GC_DMAEN (1 << 1) /* DMA Enable */ 93 #define GC_ADACKEN (1 << 0) /* Asynchronous clock output enable */ 94 #define ADC_GS 0x1C /* General status register */ 95 #define GS_AWKST (1 << 2) /* Asynchronous wakeup int status */ 96 #define GS_CALF (1 << 1) /* Calibration Failed Flag */ 97 #define GS_ADACT (1 << 0) /* Conversion Active */ 98 #define ADC_CV 0x20 /* Compare value register */ 99 #define CV_CV2_M 0xfff /* Compare Value 2 Mask */ 100 #define CV_CV2_S 16 /* Compare Value 2 Shift */ 101 #define CV_CV1_M 0xfff /* Compare Value 1 Mask */ 102 #define CV_CV1_S 0 /* Compare Value 1 Shift */ 103 #define ADC_OFS 0x24 /* Offset correction value register */ 104 #define OFS_SIGN 12 /* Sign bit */ 105 #define OFS_M 0xfff /* Offset value Mask */ 106 #define OFS_S 0 /* Offset value Shift */ 107 #define ADC_CAL 0x28 /* Calibration value register */ 108 #define CAL_CODE_M 0xf /* Calibration Result Value Mask */ 109 #define CAL_CODE_S 0 /* Calibration Result Value Shift */ 110 #define ADC_PCTL 0x30 /* Pin control register */ 111 112 struct adc_softc { 113 struct resource *res[2]; 114 bus_space_tag_t bst; 115 bus_space_handle_t bsh; 116 void *ih; 117 }; 118 119 struct adc_softc *adc_sc; 120 121 static struct resource_spec adc_spec[] = { 122 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 123 { SYS_RES_IRQ, 0, RF_ACTIVE }, 124 { -1, 0 } 125 }; 126 127 static int 128 adc_probe(device_t dev) 129 { 130 131 if (!ofw_bus_status_okay(dev)) 132 return (ENXIO); 133 134 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-adc")) 135 return (ENXIO); 136 137 device_set_desc(dev, "Vybrid Family " 138 "12-bit Analog to Digital Converter"); 139 return (BUS_PROBE_DEFAULT); 140 } 141 142 static void 143 adc_intr(void *arg) 144 { 145 146 /* Conversation complete */ 147 } 148 149 uint32_t 150 adc_read(void) 151 { 152 struct adc_softc *sc; 153 154 sc = adc_sc; 155 if (sc == NULL) 156 return (0); 157 158 return (READ4(sc, ADC_R0)); 159 } 160 161 uint32_t 162 adc_enable(int channel) 163 { 164 struct adc_softc *sc; 165 int reg; 166 167 sc = adc_sc; 168 if (sc == NULL) 169 return (1); 170 171 reg = READ4(sc, ADC_HC0); 172 reg &= ~(HC_ADCH_M << HC_ADCH_S); 173 reg |= (channel << HC_ADCH_S); 174 WRITE4(sc, ADC_HC0, reg); 175 176 return (0); 177 } 178 179 static int 180 adc_attach(device_t dev) 181 { 182 struct adc_softc *sc; 183 int err; 184 int reg; 185 186 sc = device_get_softc(dev); 187 188 if (bus_alloc_resources(dev, adc_spec, sc->res)) { 189 device_printf(dev, "could not allocate resources\n"); 190 return (ENXIO); 191 } 192 193 /* Memory interface */ 194 sc->bst = rman_get_bustag(sc->res[0]); 195 sc->bsh = rman_get_bushandle(sc->res[0]); 196 197 adc_sc = sc; 198 199 /* Setup interrupt handler */ 200 err = bus_setup_intr(dev, sc->res[1], INTR_TYPE_BIO | INTR_MPSAFE, 201 NULL, adc_intr, sc, &sc->ih); 202 if (err) { 203 device_printf(dev, "Unable to alloc interrupt resource.\n"); 204 return (ENXIO); 205 } 206 207 /* Configure 12-bit mode */ 208 reg = READ4(sc, ADC_CFG); 209 reg &= ~(CFG_MODE_M << CFG_MODE_S); 210 reg |= (CFG_MODE_12 << CFG_MODE_S); /* 12bit */ 211 WRITE4(sc, ADC_CFG, reg); 212 213 /* Configure for continuous conversion */ 214 reg = READ4(sc, ADC_GC); 215 reg |= (GC_ADCO | GC_AVGE); 216 WRITE4(sc, ADC_GC, reg); 217 218 /* Disable interrupts */ 219 reg = READ4(sc, ADC_HC0); 220 reg &= HC_AIEN; 221 WRITE4(sc, ADC_HC0, reg); 222 223 return (0); 224 } 225 226 static device_method_t adc_methods[] = { 227 DEVMETHOD(device_probe, adc_probe), 228 DEVMETHOD(device_attach, adc_attach), 229 { 0, 0 } 230 }; 231 232 static driver_t adc_driver = { 233 "adc", 234 adc_methods, 235 sizeof(struct adc_softc), 236 }; 237 238 DRIVER_MODULE(adc, simplebus, adc_driver, 0, 0); 239