imx23_apbdma.c revision 1.2.2.2
1 1.2.2.2 yamt /* $Id: imx23_apbdma.c,v 1.2.2.2 2013/01/16 05:32:47 yamt Exp $ */ 2 1.2.2.2 yamt 3 1.2.2.2 yamt /* 4 1.2.2.2 yamt * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 1.2.2.2 yamt * All rights reserved. 6 1.2.2.2 yamt * 7 1.2.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.2.2 yamt * by Petri Laakso. 9 1.2.2.2 yamt * 10 1.2.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.2.2.2 yamt * modification, are permitted provided that the following conditions 12 1.2.2.2 yamt * are met: 13 1.2.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.2.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.2.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.2.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.2.2.2 yamt * 19 1.2.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.2.2.2 yamt */ 31 1.2.2.2 yamt 32 1.2.2.2 yamt #include <sys/param.h> 33 1.2.2.2 yamt #include <sys/bus.h> 34 1.2.2.2 yamt #include <sys/device.h> 35 1.2.2.2 yamt #include <sys/errno.h> 36 1.2.2.2 yamt #include <sys/kmem.h> 37 1.2.2.2 yamt #include <sys/queue.h> 38 1.2.2.2 yamt #include <sys/systm.h> 39 1.2.2.2 yamt 40 1.2.2.2 yamt #include <arm/imx/imx23_apbdmareg.h> 41 1.2.2.2 yamt #include <arm/imx/imx23_apbhdmareg.h> 42 1.2.2.2 yamt #include <arm/imx/imx23_apbxdmareg.h> 43 1.2.2.2 yamt #include <arm/imx/imx23_apbdma.h> 44 1.2.2.2 yamt #include <arm/imx/imx23var.h> 45 1.2.2.2 yamt 46 1.2.2.2 yamt static int apbdma_match(device_t, cfdata_t, void *); 47 1.2.2.2 yamt static void apbdma_attach(device_t, device_t, void *); 48 1.2.2.2 yamt static int apbdma_activate(device_t, enum devact); 49 1.2.2.2 yamt 50 1.2.2.2 yamt #define APBDMA_SOFT_RST_LOOP 455 /* At least 1 us ... */ 51 1.2.2.2 yamt #define DMACTRL_RD(sc, reg) \ 52 1.2.2.2 yamt bus_space_read_4(sc->sc_iot, sc->sc_hdl, (reg)) 53 1.2.2.2 yamt #define DMACTRL_WR(sc, reg, val) \ 54 1.2.2.2 yamt bus_space_write_4(sc->sc_iot, sc->sc_hdl, (reg), (val)) 55 1.2.2.2 yamt 56 1.2.2.2 yamt struct apbdma_softc { 57 1.2.2.2 yamt device_t sc_dev; 58 1.2.2.2 yamt bus_space_tag_t sc_iot; 59 1.2.2.2 yamt bus_space_handle_t sc_hdl; 60 1.2.2.2 yamt bus_dma_tag_t sc_dmat; 61 1.2.2.2 yamt bus_dmamap_t sc_dmamp; 62 1.2.2.2 yamt struct imx23_dma_channel *sc_channel; 63 1.2.2.2 yamt int n_channel; 64 1.2.2.2 yamt }; 65 1.2.2.2 yamt 66 1.2.2.2 yamt struct imx23_dma_cmd { 67 1.2.2.2 yamt uint32_t next_cmd; 68 1.2.2.2 yamt uint32_t cmd; 69 1.2.2.2 yamt uint32_t buffer; 70 1.2.2.2 yamt uint32_t pio[CMDPIOWORDS_MAX]; 71 1.2.2.2 yamt SIMPLEQ_ENTRY(imx23_dma_cmd) entries; 72 1.2.2.2 yamt }; 73 1.2.2.2 yamt 74 1.2.2.2 yamt struct imx23_dma_channel { 75 1.2.2.2 yamt SIMPLEQ_HEAD(simplehead, imx23_dma_cmd) head; 76 1.2.2.2 yamt struct simplehead *headp; 77 1.2.2.2 yamt struct apbdma_softc *sc; 78 1.2.2.2 yamt }; 79 1.2.2.2 yamt 80 1.2.2.2 yamt CFATTACH_DECL3_NEW(apbdma, 81 1.2.2.2 yamt sizeof(struct apbdma_softc), 82 1.2.2.2 yamt apbdma_match, 83 1.2.2.2 yamt apbdma_attach, 84 1.2.2.2 yamt NULL, 85 1.2.2.2 yamt apbdma_activate, 86 1.2.2.2 yamt NULL, 87 1.2.2.2 yamt NULL, 88 1.2.2.2 yamt 0); 89 1.2.2.2 yamt 90 1.2.2.2 yamt static void apbdma_reset(struct apbdma_softc *); 91 1.2.2.2 yamt 92 1.2.2.2 yamt static int 93 1.2.2.2 yamt apbdma_match(device_t parent, cfdata_t match, void *aux) 94 1.2.2.2 yamt { 95 1.2.2.2 yamt struct apb_attach_args *aa = aux; 96 1.2.2.2 yamt 97 1.2.2.2 yamt if (aa->aa_addr == HW_APBHDMA_BASE && aa->aa_size == HW_APBHDMA_SIZE) 98 1.2.2.2 yamt return 1; 99 1.2.2.2 yamt 100 1.2.2.2 yamt if (aa->aa_addr == HW_APBXDMA_BASE && aa->aa_size == HW_APBXDMA_SIZE) 101 1.2.2.2 yamt return 1; 102 1.2.2.2 yamt 103 1.2.2.2 yamt return 0; 104 1.2.2.2 yamt } 105 1.2.2.2 yamt 106 1.2.2.2 yamt static void 107 1.2.2.2 yamt apbdma_attach(device_t parent, device_t self, void *aux) 108 1.2.2.2 yamt { 109 1.2.2.2 yamt struct apb_attach_args *aa = aux; 110 1.2.2.2 yamt struct apbdma_softc *sc = device_private(self); 111 1.2.2.2 yamt //struct apb_softc *scp = device_private(parent); 112 1.2.2.2 yamt 113 1.2.2.2 yamt // static int apbdma_attached = 0; 114 1.2.2.2 yamt // struct imx23_dma_channel *chan; 115 1.2.2.2 yamt // int i; 116 1.2.2.2 yamt int error; 117 1.2.2.2 yamt 118 1.2.2.2 yamt // if (apbdma_attached) 119 1.2.2.2 yamt // return; 120 1.2.2.2 yamt 121 1.2.2.2 yamt sc->sc_dev = self; 122 1.2.2.2 yamt sc->sc_iot = aa->aa_iot; 123 1.2.2.2 yamt sc->sc_dmat = aa->aa_dmat; 124 1.2.2.2 yamt 125 1.2.2.2 yamt /* 126 1.2.2.2 yamt * Parent bus softc has a pointer to DMA controller device_t for 127 1.2.2.2 yamt * specific bus. As different busses need different instances of the 128 1.2.2.2 yamt * DMA driver. The apb_softc.dmac is set up here. Now device drivers 129 1.2.2.2 yamt * which use DMA can pass apb_softc.dmac from their parent to apbdma 130 1.2.2.2 yamt * functions. 131 1.2.2.2 yamt */ 132 1.2.2.2 yamt if (bus_space_map(sc->sc_iot, 133 1.2.2.2 yamt aa->aa_addr, aa->aa_size, 0, &(sc->sc_hdl))) { 134 1.2.2.2 yamt aprint_error_dev(sc->sc_dev, "unable to map bus space\n"); 135 1.2.2.2 yamt return; 136 1.2.2.2 yamt } 137 1.2.2.2 yamt 138 1.2.2.2 yamt error = bus_dmamap_create(sc->sc_dmat, PAGE_SIZE, 1, 139 1.2.2.2 yamt PAGE_SIZE, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW, &sc->sc_dmamp); 140 1.2.2.2 yamt if (error) { 141 1.2.2.2 yamt aprint_error_dev(sc->sc_dev, 142 1.2.2.2 yamt "couldn't create dma map. (error=%d)\n", error); 143 1.2.2.2 yamt return; 144 1.2.2.2 yamt } 145 1.2.2.2 yamt #ifdef notyet 146 1.2.2.2 yamt if (aa->aa_addr == HW_APBHDMA_BASE && aa->aa_size == HW_APBHDMA_SIZE) { 147 1.2.2.2 yamt sc->sc_channel = kmem_alloc(sizeof(struct imx23_dma_channel) 148 1.2.2.2 yamt * APBH_DMA_N_CHANNELS, KM_SLEEP); 149 1.2.2.2 yamt sc->n_channel = APBH_DMA_N_CHANNELS; 150 1.2.2.2 yamt } 151 1.2.2.2 yamt 152 1.2.2.2 yamt if (aa->aa_addr == HW_APBXDMA_BASE && aa->aa_size == HW_APBXDMA_SIZE) { 153 1.2.2.2 yamt sc->sc_channel = kmem_alloc(sizeof(struct imx23_dma_channel) 154 1.2.2.2 yamt * APBX_DMA_N_CHANNELS, KM_SLEEP); 155 1.2.2.2 yamt sc->n_channel = APBX_DMA_N_CHANNELS; 156 1.2.2.2 yamt } 157 1.2.2.2 yamt 158 1.2.2.2 yamt if (sc->sc_channel == NULL) { 159 1.2.2.2 yamt aprint_error_dev(sc->sc_dev, "unable to allocate memory for" 160 1.2.2.2 yamt " DMA channel structures\n"); 161 1.2.2.2 yamt return; 162 1.2.2.2 yamt } 163 1.2.2.2 yamt 164 1.2.2.2 yamt for (i=0; i < sc->n_channel; i++) { 165 1.2.2.2 yamt chan = (struct imx23_dma_channel *)sc->sc_channel+i; 166 1.2.2.2 yamt chan->sc = sc; 167 1.2.2.2 yamt SIMPLEQ_INIT(&chan->head); 168 1.2.2.2 yamt } 169 1.2.2.2 yamt #endif 170 1.2.2.2 yamt apbdma_reset(sc); 171 1.2.2.2 yamt // apbdma_attached = 1; 172 1.2.2.2 yamt 173 1.2.2.2 yamt aprint_normal("\n"); 174 1.2.2.2 yamt 175 1.2.2.2 yamt return; 176 1.2.2.2 yamt } 177 1.2.2.2 yamt 178 1.2.2.2 yamt static int 179 1.2.2.2 yamt apbdma_activate(device_t self, enum devact act) 180 1.2.2.2 yamt { 181 1.2.2.2 yamt return EOPNOTSUPP; 182 1.2.2.2 yamt } 183 1.2.2.2 yamt 184 1.2.2.2 yamt /* 185 1.2.2.2 yamt * Reset the APB{H,X}DMA block. 186 1.2.2.2 yamt * 187 1.2.2.2 yamt * Inspired by i.MX233 RM "39.3.10 Correct Way to Soft Reset a Block" 188 1.2.2.2 yamt */ 189 1.2.2.2 yamt static void 190 1.2.2.2 yamt apbdma_reset(struct apbdma_softc *sc) 191 1.2.2.2 yamt { 192 1.2.2.2 yamt unsigned int loop; 193 1.2.2.2 yamt 194 1.2.2.2 yamt /* 195 1.2.2.2 yamt * Prepare for soft-reset by making sure that SFTRST is not currently 196 1.2.2.2 yamt * asserted. Also clear CLKGATE so we can wait for its assertion below. 197 1.2.2.2 yamt */ 198 1.2.2.2 yamt DMACTRL_WR(sc, HW_APB_CTRL0_CLR, HW_APB_CTRL0_SFTRST); 199 1.2.2.2 yamt 200 1.2.2.2 yamt /* Wait at least a microsecond for SFTRST to deassert. */ 201 1.2.2.2 yamt loop = 0; 202 1.2.2.2 yamt while ((DMACTRL_RD(sc, HW_APB_CTRL0) & HW_APB_CTRL0_SFTRST) || 203 1.2.2.2 yamt (loop < APBDMA_SOFT_RST_LOOP)) 204 1.2.2.2 yamt { 205 1.2.2.2 yamt loop++; 206 1.2.2.2 yamt } 207 1.2.2.2 yamt 208 1.2.2.2 yamt /* Clear CLKGATE so we can wait for its assertion below. */ 209 1.2.2.2 yamt DMACTRL_WR(sc, HW_APB_CTRL0_CLR, HW_APB_CTRL0_CLKGATE); 210 1.2.2.2 yamt 211 1.2.2.2 yamt /* Soft-reset the block. */ 212 1.2.2.2 yamt DMACTRL_WR(sc, HW_APB_CTRL0_SET, HW_APB_CTRL0_SFTRST); 213 1.2.2.2 yamt 214 1.2.2.2 yamt /* Wait until clock is in the gated state. */ 215 1.2.2.2 yamt while (!(DMACTRL_RD(sc, HW_APB_CTRL0) & HW_APB_CTRL0_CLKGATE)); 216 1.2.2.2 yamt 217 1.2.2.2 yamt /* Bring block out of reset. */ 218 1.2.2.2 yamt DMACTRL_WR(sc, HW_APB_CTRL0_CLR, HW_APB_CTRL0_SFTRST); 219 1.2.2.2 yamt 220 1.2.2.2 yamt loop = 0; 221 1.2.2.2 yamt while ((DMACTRL_RD(sc, HW_APB_CTRL0) & HW_APB_CTRL0_SFTRST) || 222 1.2.2.2 yamt (loop < APBDMA_SOFT_RST_LOOP)) 223 1.2.2.2 yamt { 224 1.2.2.2 yamt loop++; 225 1.2.2.2 yamt } 226 1.2.2.2 yamt 227 1.2.2.2 yamt DMACTRL_WR(sc, HW_APB_CTRL0_CLR, HW_APB_CTRL0_CLKGATE); 228 1.2.2.2 yamt 229 1.2.2.2 yamt /* Wait until clock is in the NON-gated state. */ 230 1.2.2.2 yamt while (DMACTRL_RD(sc, HW_APB_CTRL0) & HW_APB_CTRL0_CLKGATE); 231 1.2.2.2 yamt 232 1.2.2.2 yamt return; 233 1.2.2.2 yamt } 234 1.2.2.2 yamt 235 1.2.2.2 yamt /* 236 1.2.2.2 yamt * Allocate DMA safe memory for commands. 237 1.2.2.2 yamt */ 238 1.2.2.2 yamt void * 239 1.2.2.2 yamt apbdma_dmamem_alloc(device_t dmac, int channel, bus_size_t size) 240 1.2.2.2 yamt { 241 1.2.2.2 yamt struct apbdma_softc *sc = device_private(dmac); 242 1.2.2.2 yamt bus_dma_segment_t segs[1]; /* bus_dmamem_free needs. */ 243 1.2.2.2 yamt int rsegs; 244 1.2.2.2 yamt int error; 245 1.2.2.2 yamt void *ptr = NULL; /* bus_dmamem_unmap needs (size also) */ 246 1.2.2.2 yamt 247 1.2.2.2 yamt if (size > PAGE_SIZE) 248 1.2.2.2 yamt return NULL; 249 1.2.2.2 yamt 250 1.2.2.2 yamt error = bus_dmamem_alloc(sc->sc_dmat, size, PAGE_SIZE, 0, segs, 1, 251 1.2.2.2 yamt &rsegs, BUS_DMA_NOWAIT); 252 1.2.2.2 yamt if (error) 253 1.2.2.2 yamt goto out; 254 1.2.2.2 yamt //XXX: 255 1.2.2.2 yamt printf("segs[0].ds_addr=%lx, segs[0].ds_len=%lx, rsegs=%d\n", segs[0].ds_addr, segs[0].ds_len, rsegs); 256 1.2.2.2 yamt 257 1.2.2.2 yamt error = bus_dmamem_map(sc->sc_dmat, segs, 1, size, &ptr, 258 1.2.2.2 yamt BUS_DMA_NOWAIT); 259 1.2.2.2 yamt if (error) 260 1.2.2.2 yamt goto free; 261 1.2.2.2 yamt //XXX: 262 1.2.2.2 yamt printf("segs[0].ds_addr=%lx, segs[0].ds_len=%lx, ptr=%p\n", segs[0].ds_addr, segs[0].ds_len, ptr); 263 1.2.2.2 yamt 264 1.2.2.2 yamt error = bus_dmamap_load(sc->sc_dmat, sc->sc_dmamp, ptr, size, NULL, 265 1.2.2.2 yamt BUS_DMA_NOWAIT | BUS_DMA_WRITE); 266 1.2.2.2 yamt if (error) 267 1.2.2.2 yamt goto unmap; 268 1.2.2.2 yamt 269 1.2.2.2 yamt bus_dmamap_sync(sc->sc_dmat, sc->sc_dmamp, 0, size, 270 1.2.2.2 yamt BUS_DMASYNC_PREWRITE); 271 1.2.2.2 yamt 272 1.2.2.2 yamt // return usable memory 273 1.2.2.2 yamt unmap: 274 1.2.2.2 yamt bus_dmamem_unmap(sc->sc_dmat, ptr, size); 275 1.2.2.2 yamt free: 276 1.2.2.2 yamt bus_dmamem_free(sc->sc_dmat, segs, 1); 277 1.2.2.2 yamt out: 278 1.2.2.2 yamt return NULL; 279 1.2.2.2 yamt } 280
Indexes created Wed Oct 01 15:09:59 GMT 2025