omap-dma.c revision 3a774ea91a5d05e7af58db6ae1ba298263c4a3d3
17bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King/* 27bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * OMAP DMAengine support 37bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * 47bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * This program is free software; you can redistribute it and/or modify 57bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * it under the terms of the GNU General Public License version 2 as 67bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * published by the Free Software Foundation. 77bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King */ 87bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/dmaengine.h> 97bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/dma-mapping.h> 107bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/err.h> 117bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/init.h> 127bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/interrupt.h> 137bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/list.h> 147bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/module.h> 157bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/omap-dma.h> 167bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/platform_device.h> 177bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/slab.h> 187bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <linux/spinlock.h> 197bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 207bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include "virt-dma.h" 217bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King#include <plat/dma.h> 227bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 237bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstruct omap_dmadev { 247bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct dma_device ddev; 257bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spinlock_t lock; 267bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct tasklet_struct task; 277bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct list_head pending; 287bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King}; 297bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 307bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstruct omap_chan { 317bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct virt_dma_chan vc; 327bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct list_head node; 337bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 347bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct dma_slave_config cfg; 357bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King unsigned dma_sig; 363a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King bool cyclic; 377bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 387bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King int dma_ch; 397bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_desc *desc; 407bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King unsigned sgidx; 417bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King}; 427bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 437bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstruct omap_sg { 447bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dma_addr_t addr; 457bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King uint32_t en; /* number of elements (24-bit) */ 467bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King uint32_t fn; /* number of frames (16-bit) */ 477bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King}; 487bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 497bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstruct omap_desc { 507bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct virt_dma_desc vd; 517bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King enum dma_transfer_direction dir; 527bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dma_addr_t dev_addr; 537bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 547c836bc7f9f71d62a8dc50712db122a69b405486Russell King int16_t fi; /* for OMAP_DMA_SYNC_PACKET */ 557bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King uint8_t es; /* OMAP_DMA_DATA_TYPE_xxx */ 567bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King uint8_t sync_mode; /* OMAP_DMA_SYNC_xxx */ 577bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King uint8_t sync_type; /* OMAP_DMA_xxx_SYNC* */ 587bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King uint8_t periph_port; /* Peripheral port */ 597bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 607bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King unsigned sglen; 617bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_sg sg[0]; 627bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King}; 637bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 647bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic const unsigned es_bytes[] = { 657bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King [OMAP_DMA_DATA_TYPE_S8] = 1, 667bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King [OMAP_DMA_DATA_TYPE_S16] = 2, 677bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King [OMAP_DMA_DATA_TYPE_S32] = 4, 687bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King}; 697bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 707bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic inline struct omap_dmadev *to_omap_dma_dev(struct dma_device *d) 717bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 727bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return container_of(d, struct omap_dmadev, ddev); 737bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 747bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 757bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic inline struct omap_chan *to_omap_dma_chan(struct dma_chan *c) 767bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 777bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return container_of(c, struct omap_chan, vc.chan); 787bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 797bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 807bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic inline struct omap_desc *to_omap_dma_desc(struct dma_async_tx_descriptor *t) 817bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 827bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return container_of(t, struct omap_desc, vd.tx); 837bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 847bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 857bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic void omap_dma_desc_free(struct virt_dma_desc *vd) 867bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 877bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King kfree(container_of(vd, struct omap_desc, vd)); 887bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 897bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 907bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d, 917bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King unsigned idx) 927bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 937bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_sg *sg = d->sg + idx; 947bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 957bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (d->dir == DMA_DEV_TO_MEM) 967bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_set_dma_dest_params(c->dma_ch, OMAP_DMA_PORT_EMIFF, 977bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King OMAP_DMA_AMODE_POST_INC, sg->addr, 0, 0); 987bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King else 997bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_set_dma_src_params(c->dma_ch, OMAP_DMA_PORT_EMIFF, 1007bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King OMAP_DMA_AMODE_POST_INC, sg->addr, 0, 0); 1017bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1027bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_set_dma_transfer_params(c->dma_ch, d->es, sg->en, sg->fn, 1037bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->sync_mode, c->dma_sig, d->sync_type); 1047bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1057bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_start_dma(c->dma_ch); 1067bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 1077bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1087bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic void omap_dma_start_desc(struct omap_chan *c) 1097bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 1107bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct virt_dma_desc *vd = vchan_next_desc(&c->vc); 1117bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_desc *d; 1127bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1137bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (!vd) { 1147bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King c->desc = NULL; 1157bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return; 1167bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 1177bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1187bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King list_del(&vd->node); 1197bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1207bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King c->desc = d = to_omap_dma_desc(&vd->tx); 1217bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King c->sgidx = 0; 1227bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1237bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (d->dir == DMA_DEV_TO_MEM) 1247bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_set_dma_src_params(c->dma_ch, d->periph_port, 1257c836bc7f9f71d62a8dc50712db122a69b405486Russell King OMAP_DMA_AMODE_CONSTANT, d->dev_addr, 0, d->fi); 1267bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King else 1277bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_set_dma_dest_params(c->dma_ch, d->periph_port, 1287c836bc7f9f71d62a8dc50712db122a69b405486Russell King OMAP_DMA_AMODE_CONSTANT, d->dev_addr, 0, d->fi); 1297bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1307bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_dma_start_sg(c, d, 0); 1317bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 1327bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1337bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic void omap_dma_callback(int ch, u16 status, void *data) 1347bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 1357bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan *c = data; 1367bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_desc *d; 1377bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King unsigned long flags; 1387bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1397bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_lock_irqsave(&c->vc.lock, flags); 1407bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d = c->desc; 1417bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (d) { 1423a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King if (!c->cyclic) { 1433a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King if (++c->sgidx < d->sglen) { 1443a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King omap_dma_start_sg(c, d, c->sgidx); 1453a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King } else { 1463a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King omap_dma_start_desc(c); 1473a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King vchan_cookie_complete(&d->vd); 1483a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King } 1497bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } else { 1503a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King vchan_cyclic_callback(&d->vd); 1517bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 1527bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 1537bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_unlock_irqrestore(&c->vc.lock, flags); 1547bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 1557bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1567bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King/* 1577bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * This callback schedules all pending channels. We could be more 1587bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * clever here by postponing allocation of the real DMA channels to 1597bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * this point, and freeing them when our virtual channel becomes idle. 1607bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * 1617bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * We would then need to deal with 'all channels in-use' 1627bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King */ 1637bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic void omap_dma_sched(unsigned long data) 1647bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 1657bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_dmadev *d = (struct omap_dmadev *)data; 1667bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King LIST_HEAD(head); 1677bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1687bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_lock_irq(&d->lock); 1697bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King list_splice_tail_init(&d->pending, &head); 1707bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_unlock_irq(&d->lock); 1717bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1727bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King while (!list_empty(&head)) { 1737bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan *c = list_first_entry(&head, 1747bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan, node); 1757bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1767bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_lock_irq(&c->vc.lock); 1777bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King list_del_init(&c->node); 1787bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_dma_start_desc(c); 1797bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_unlock_irq(&c->vc.lock); 1807bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 1817bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 1827bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1837bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic int omap_dma_alloc_chan_resources(struct dma_chan *chan) 1847bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 1857bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan *c = to_omap_dma_chan(chan); 1867bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1877bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dev_info(c->vc.chan.device->dev, "allocating channel for %u\n", c->dma_sig); 1887bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1897bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return omap_request_dma(c->dma_sig, "DMA engine", 1907bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_dma_callback, c, &c->dma_ch); 1917bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 1927bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1937bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic void omap_dma_free_chan_resources(struct dma_chan *chan) 1947bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 1957bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan *c = to_omap_dma_chan(chan); 1967bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 1977bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King vchan_free_chan_resources(&c->vc); 1987bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_free_dma(c->dma_ch); 1997bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 2007bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dev_info(c->vc.chan.device->dev, "freeing channel for %u\n", c->dma_sig); 2017bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 2027bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 2033850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell Kingstatic size_t omap_dma_sg_size(struct omap_sg *sg) 2043850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King{ 2053850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King return sg->en * sg->fn; 2063850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King} 2073850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2083850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell Kingstatic size_t omap_dma_desc_size(struct omap_desc *d) 2093850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King{ 2103850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King unsigned i; 2113850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King size_t size; 2123850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2133850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King for (size = i = 0; i < d->sglen; i++) 2143850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King size += omap_dma_sg_size(&d->sg[i]); 2153850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2163850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King return size * es_bytes[d->es]; 2173850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King} 2183850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2193850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell Kingstatic size_t omap_dma_desc_size_pos(struct omap_desc *d, dma_addr_t addr) 2203850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King{ 2213850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King unsigned i; 2223850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King size_t size, es_size = es_bytes[d->es]; 2233850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2243850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King for (size = i = 0; i < d->sglen; i++) { 2253850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King size_t this_size = omap_dma_sg_size(&d->sg[i]) * es_size; 2263850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2273850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King if (size) 2283850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King size += this_size; 2293850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King else if (addr >= d->sg[i].addr && 2303850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King addr < d->sg[i].addr + this_size) 2313850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King size += d->sg[i].addr + this_size - addr; 2323850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King } 2333850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King return size; 2343850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King} 2353850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2367bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic enum dma_status omap_dma_tx_status(struct dma_chan *chan, 2377bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dma_cookie_t cookie, struct dma_tx_state *txstate) 2387bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 2393850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King struct omap_chan *c = to_omap_dma_chan(chan); 2403850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King struct virt_dma_desc *vd; 2413850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King enum dma_status ret; 2423850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King unsigned long flags; 2433850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2443850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King ret = dma_cookie_status(chan, cookie, txstate); 2453850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King if (ret == DMA_SUCCESS || !txstate) 2463850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King return ret; 2473850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2483850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King spin_lock_irqsave(&c->vc.lock, flags); 2493850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King vd = vchan_find_desc(&c->vc, cookie); 2503850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King if (vd) { 2513850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King txstate->residue = omap_dma_desc_size(to_omap_dma_desc(&vd->tx)); 2523850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King } else if (c->desc && c->desc->vd.tx.cookie == cookie) { 2533850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King struct omap_desc *d = c->desc; 2543850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King dma_addr_t pos; 2553850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2563850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King if (d->dir == DMA_MEM_TO_DEV) 2573850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King pos = omap_get_dma_src_pos(c->dma_ch); 2583850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King else if (d->dir == DMA_DEV_TO_MEM) 2593850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King pos = omap_get_dma_dst_pos(c->dma_ch); 2603850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King else 2613850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King pos = 0; 2623850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2633850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King txstate->residue = omap_dma_desc_size_pos(d, pos); 2643850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King } else { 2653850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King txstate->residue = 0; 2663850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King } 2673850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King spin_unlock_irqrestore(&c->vc.lock, flags); 2683850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King 2693850e22f5146d2ff5b66f1b7460d4720d5f1b6c7Russell King return ret; 2707bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 2717bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 2727bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic void omap_dma_issue_pending(struct dma_chan *chan) 2737bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 2747bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan *c = to_omap_dma_chan(chan); 2757bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King unsigned long flags; 2767bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 2777bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_lock_irqsave(&c->vc.lock, flags); 2787bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (vchan_issue_pending(&c->vc) && !c->desc) { 2797bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_dmadev *d = to_omap_dma_dev(chan->device); 2807bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_lock(&d->lock); 2817bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (list_empty(&c->node)) 2827bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King list_add_tail(&c->node, &d->pending); 2837bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_unlock(&d->lock); 2847bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King tasklet_schedule(&d->task); 2857bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 2867bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_unlock_irqrestore(&c->vc.lock, flags); 2877bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 2887bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 2897bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic struct dma_async_tx_descriptor *omap_dma_prep_slave_sg( 2907bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct dma_chan *chan, struct scatterlist *sgl, unsigned sglen, 2917bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King enum dma_transfer_direction dir, unsigned long tx_flags, void *context) 2927bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 2937bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan *c = to_omap_dma_chan(chan); 2947bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King enum dma_slave_buswidth dev_width; 2957bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct scatterlist *sgent; 2967bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_desc *d; 2977bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dma_addr_t dev_addr; 2987bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King unsigned i, j = 0, es, en, frame_bytes, sync_type; 2997bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King u32 burst; 3007bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 3017bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (dir == DMA_DEV_TO_MEM) { 3027bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dev_addr = c->cfg.src_addr; 3037bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dev_width = c->cfg.src_addr_width; 3047bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King burst = c->cfg.src_maxburst; 3057bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King sync_type = OMAP_DMA_SRC_SYNC; 3067bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } else if (dir == DMA_MEM_TO_DEV) { 3077bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dev_addr = c->cfg.dst_addr; 3087bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dev_width = c->cfg.dst_addr_width; 3097bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King burst = c->cfg.dst_maxburst; 3107bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King sync_type = OMAP_DMA_DST_SYNC; 3117bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } else { 3127bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dev_err(chan->device->dev, "%s: bad direction?\n", __func__); 3137bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return NULL; 3147bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 3157bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 3167bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King /* Bus width translates to the element size (ES) */ 3177bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King switch (dev_width) { 3187bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King case DMA_SLAVE_BUSWIDTH_1_BYTE: 3197bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King es = OMAP_DMA_DATA_TYPE_S8; 3207bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King break; 3217bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King case DMA_SLAVE_BUSWIDTH_2_BYTES: 3227bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King es = OMAP_DMA_DATA_TYPE_S16; 3237bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King break; 3247bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King case DMA_SLAVE_BUSWIDTH_4_BYTES: 3257bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King es = OMAP_DMA_DATA_TYPE_S32; 3267bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King break; 3277bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King default: /* not reached */ 3287bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return NULL; 3297bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 3307bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 3317bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King /* Now allocate and setup the descriptor. */ 3327bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d = kzalloc(sizeof(*d) + sglen * sizeof(d->sg[0]), GFP_ATOMIC); 3337bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (!d) 3347bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return NULL; 3357bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 3367bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->dir = dir; 3377bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->dev_addr = dev_addr; 3387bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->es = es; 3397bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->sync_mode = OMAP_DMA_SYNC_FRAME; 3407bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->sync_type = sync_type; 3417bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->periph_port = OMAP_DMA_PORT_TIPB; 3427bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 3437bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King /* 3447bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * Build our scatterlist entries: each contains the address, 3457bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * the number of elements (EN) in each frame, and the number of 3467bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * frames (FN). Number of bytes for this entry = ES * EN * FN. 3477bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * 3487bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * Burst size translates to number of elements with frame sync. 3497bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * Note: DMA engine defines burst to be the number of dev-width 3507bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * transfers. 3517bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King */ 3527bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King en = burst; 3537bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King frame_bytes = es_bytes[es] * en; 3547bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King for_each_sg(sgl, sgent, sglen, i) { 3557bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->sg[j].addr = sg_dma_address(sgent); 3567bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->sg[j].en = en; 3577bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->sg[j].fn = sg_dma_len(sgent) / frame_bytes; 3587bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King j++; 3597bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 3607bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 3617bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King d->sglen = j; 3627bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 3637bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return vchan_tx_prep(&c->vc, &d->vd, tx_flags); 3647bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 3657bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 3663a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell Kingstatic struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic( 3673a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, 3683a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King size_t period_len, enum dma_transfer_direction dir, void *context) 3693a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King{ 3703a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King struct omap_chan *c = to_omap_dma_chan(chan); 3713a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King enum dma_slave_buswidth dev_width; 3723a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King struct omap_desc *d; 3733a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King dma_addr_t dev_addr; 3743a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King unsigned es, sync_type; 3753a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King u32 burst; 3763a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King 3773a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King if (dir == DMA_DEV_TO_MEM) { 3783a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King dev_addr = c->cfg.src_addr; 3793a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King dev_width = c->cfg.src_addr_width; 3803a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King burst = c->cfg.src_maxburst; 3813a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King sync_type = OMAP_DMA_SRC_SYNC; 3823a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King } else if (dir == DMA_MEM_TO_DEV) { 3833a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King dev_addr = c->cfg.dst_addr; 3843a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King dev_width = c->cfg.dst_addr_width; 3853a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King burst = c->cfg.dst_maxburst; 3863a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King sync_type = OMAP_DMA_DST_SYNC; 3873a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King } else { 3883a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King dev_err(chan->device->dev, "%s: bad direction?\n", __func__); 3893a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King return NULL; 3903a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King } 3913a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King 3923a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King /* Bus width translates to the element size (ES) */ 3933a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King switch (dev_width) { 3943a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King case DMA_SLAVE_BUSWIDTH_1_BYTE: 3953a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King es = OMAP_DMA_DATA_TYPE_S8; 3963a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King break; 3973a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King case DMA_SLAVE_BUSWIDTH_2_BYTES: 3983a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King es = OMAP_DMA_DATA_TYPE_S16; 3993a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King break; 4003a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King case DMA_SLAVE_BUSWIDTH_4_BYTES: 4013a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King es = OMAP_DMA_DATA_TYPE_S32; 4023a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King break; 4033a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King default: /* not reached */ 4043a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King return NULL; 4053a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King } 4063a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King 4073a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King /* Now allocate and setup the descriptor. */ 4083a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d = kzalloc(sizeof(*d) + sizeof(d->sg[0]), GFP_ATOMIC); 4093a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King if (!d) 4103a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King return NULL; 4113a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King 4123a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->dir = dir; 4133a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->dev_addr = dev_addr; 4143a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->fi = burst; 4153a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->es = es; 4163a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->sync_mode = OMAP_DMA_SYNC_PACKET; 4173a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->sync_type = sync_type; 4183a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->periph_port = OMAP_DMA_PORT_MPUI; 4193a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->sg[0].addr = buf_addr; 4203a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->sg[0].en = period_len / es_bytes[es]; 4213a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->sg[0].fn = buf_len / period_len; 4223a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King d->sglen = 1; 4233a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King 4243a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King if (!c->cyclic) { 4253a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King c->cyclic = true; 4263a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King omap_dma_link_lch(c->dma_ch, c->dma_ch); 4273a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King omap_enable_dma_irq(c->dma_ch, OMAP_DMA_FRAME_IRQ); 4283a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King omap_disable_dma_irq(c->dma_ch, OMAP_DMA_BLOCK_IRQ); 4293a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King } 4303a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King 4313a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King if (!cpu_class_is_omap1()) { 4323a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King omap_set_dma_src_burst_mode(c->dma_ch, OMAP_DMA_DATA_BURST_16); 4333a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King omap_set_dma_dest_burst_mode(c->dma_ch, OMAP_DMA_DATA_BURST_16); 4343a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King } 4353a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King 4363a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King return vchan_tx_prep(&c->vc, &d->vd, DMA_CTRL_ACK | DMA_PREP_INTERRUPT); 4373a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King} 4383a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King 4397bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic int omap_dma_slave_config(struct omap_chan *c, struct dma_slave_config *cfg) 4407bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 4417bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || 4427bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) 4437bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return -EINVAL; 4447bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4457bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King memcpy(&c->cfg, cfg, sizeof(c->cfg)); 4467bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4477bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return 0; 4487bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 4497bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4507bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic int omap_dma_terminate_all(struct omap_chan *c) 4517bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 4527bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_dmadev *d = to_omap_dma_dev(c->vc.chan.device); 4537bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King unsigned long flags; 4547bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King LIST_HEAD(head); 4557bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4567bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_lock_irqsave(&c->vc.lock, flags); 4577bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4587bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King /* Prevent this channel being scheduled */ 4597bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_lock(&d->lock); 4607bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King list_del_init(&c->node); 4617bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_unlock(&d->lock); 4627bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4637bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King /* 4647bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * Stop DMA activity: we assume the callback will not be called 4657bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * after omap_stop_dma() returns (even if it does, it will see 4667bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King * c->desc is NULL and exit.) 4677bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King */ 4687bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (c->desc) { 4697bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King c->desc = NULL; 4707bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_stop_dma(c->dma_ch); 4717bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 4727bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4733a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King if (c->cyclic) { 4743a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King c->cyclic = false; 4753a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King omap_dma_unlink_lch(c->dma_ch, c->dma_ch); 4763a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King } 4773a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King 4787bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King vchan_get_all_descriptors(&c->vc, &head); 4797bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_unlock_irqrestore(&c->vc.lock, flags); 4807bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King vchan_dma_desc_free_list(&c->vc, &head); 4817bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4827bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return 0; 4837bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 4847bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4857bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic int omap_dma_pause(struct omap_chan *c) 4867bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 4877bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King /* FIXME: not supported by platform private API */ 4887bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return -EINVAL; 4897bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 4907bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4917bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic int omap_dma_resume(struct omap_chan *c) 4927bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 4937bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King /* FIXME: not supported by platform private API */ 4947bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return -EINVAL; 4957bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 4967bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 4977bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic int omap_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, 4987bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King unsigned long arg) 4997bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 5007bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan *c = to_omap_dma_chan(chan); 5017bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King int ret; 5027bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5037bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King switch (cmd) { 5047bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King case DMA_SLAVE_CONFIG: 5057bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King ret = omap_dma_slave_config(c, (struct dma_slave_config *)arg); 5067bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King break; 5077bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5087bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King case DMA_TERMINATE_ALL: 5097bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King ret = omap_dma_terminate_all(c); 5107bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King break; 5117bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5127bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King case DMA_PAUSE: 5137bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King ret = omap_dma_pause(c); 5147bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King break; 5157bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5167bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King case DMA_RESUME: 5177bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King ret = omap_dma_resume(c); 5187bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King break; 5197bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5207bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King default: 5217bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King ret = -ENXIO; 5227bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King break; 5237bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 5247bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5257bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return ret; 5267bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 5277bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5287bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic int omap_dma_chan_init(struct omap_dmadev *od, int dma_sig) 5297bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 5307bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan *c; 5317bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5327bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King c = kzalloc(sizeof(*c), GFP_KERNEL); 5337bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (!c) 5347bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return -ENOMEM; 5357bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5367bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King c->dma_sig = dma_sig; 5377bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King c->vc.desc_free = omap_dma_desc_free; 5387bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King vchan_init(&c->vc, &od->ddev); 5397bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King INIT_LIST_HEAD(&c->node); 5407bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5417bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King od->ddev.chancnt++; 5427bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5437bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return 0; 5447bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 5457bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5467bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic void omap_dma_free(struct omap_dmadev *od) 5477bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 5487bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King tasklet_kill(&od->task); 5497bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King while (!list_empty(&od->ddev.channels)) { 5507bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan *c = list_first_entry(&od->ddev.channels, 5517bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan, vc.chan.device_node); 5527bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5537bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King list_del(&c->vc.chan.device_node); 5547bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King tasklet_kill(&c->vc.task); 5557bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King kfree(c); 5567bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 5577bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King kfree(od); 5587bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 5597bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5607bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic int omap_dma_probe(struct platform_device *pdev) 5617bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 5627bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_dmadev *od; 5637bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King int rc, i; 5647bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5657bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King od = kzalloc(sizeof(*od), GFP_KERNEL); 5667bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (!od) 5677bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return -ENOMEM; 5687bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5697bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dma_cap_set(DMA_SLAVE, od->ddev.cap_mask); 5703a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask); 5717bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King od->ddev.device_alloc_chan_resources = omap_dma_alloc_chan_resources; 5727bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King od->ddev.device_free_chan_resources = omap_dma_free_chan_resources; 5737bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King od->ddev.device_tx_status = omap_dma_tx_status; 5747bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King od->ddev.device_issue_pending = omap_dma_issue_pending; 5757bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King od->ddev.device_prep_slave_sg = omap_dma_prep_slave_sg; 5763a774ea91a5d05e7af58db6ae1ba298263c4a3d3Russell King od->ddev.device_prep_dma_cyclic = omap_dma_prep_dma_cyclic; 5777bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King od->ddev.device_control = omap_dma_control; 5787bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King od->ddev.dev = &pdev->dev; 5797bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King INIT_LIST_HEAD(&od->ddev.channels); 5807bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King INIT_LIST_HEAD(&od->pending); 5817bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King spin_lock_init(&od->lock); 5827bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5837bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King tasklet_init(&od->task, omap_dma_sched, (unsigned long)od); 5847bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5857bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King for (i = 0; i < 127; i++) { 5867bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King rc = omap_dma_chan_init(od, i); 5877bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (rc) { 5887bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_dma_free(od); 5897bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return rc; 5907bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 5917bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 5927bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 5937bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King rc = dma_async_device_register(&od->ddev); 5947bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (rc) { 5957bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King pr_warn("OMAP-DMA: failed to register slave DMA engine device: %d\n", 5967bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King rc); 5977bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_dma_free(od); 5987bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } else { 5997bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King platform_set_drvdata(pdev, od); 6007bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 6017bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6027bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dev_info(&pdev->dev, "OMAP DMA engine driver\n"); 6037bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6047bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return rc; 6057bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 6067bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6077bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic int omap_dma_remove(struct platform_device *pdev) 6087bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 6097bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_dmadev *od = platform_get_drvdata(pdev); 6107bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6117bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King dma_async_device_unregister(&od->ddev); 6127bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King omap_dma_free(od); 6137bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6147bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return 0; 6157bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 6167bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6177bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic struct platform_driver omap_dma_driver = { 6187bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King .probe = omap_dma_probe, 6197bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King .remove = omap_dma_remove, 6207bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King .driver = { 6217bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King .name = "omap-dma-engine", 6227bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King .owner = THIS_MODULE, 6237bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King }, 6247bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King}; 6257bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6267bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingbool omap_dma_filter_fn(struct dma_chan *chan, void *param) 6277bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 6287bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (chan->device->dev->driver == &omap_dma_driver.driver) { 6297bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King struct omap_chan *c = to_omap_dma_chan(chan); 6307bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King unsigned req = *(unsigned *)param; 6317bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6327bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return req == c->dma_sig; 6337bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 6347bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return false; 6357bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 6367bedaa5537604f34d1d63c5ec7891e559d2a61edRussell KingEXPORT_SYMBOL_GPL(omap_dma_filter_fn); 6377bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6387bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic struct platform_device *pdev; 6397bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6407bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic const struct platform_device_info omap_dma_dev_info = { 6417bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King .name = "omap-dma-engine", 6427bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King .id = -1, 6437bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King .dma_mask = DMA_BIT_MASK(32), 6447bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King}; 6457bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6467bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic int omap_dma_init(void) 6477bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 6487bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King int rc = platform_driver_register(&omap_dma_driver); 6497bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6507bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (rc == 0) { 6517bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King pdev = platform_device_register_full(&omap_dma_dev_info); 6527bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King if (IS_ERR(pdev)) { 6537bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King platform_driver_unregister(&omap_dma_driver); 6547bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King rc = PTR_ERR(pdev); 6557bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 6567bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King } 6577bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King return rc; 6587bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 6597bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingsubsys_initcall(omap_dma_init); 6607bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6617bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingstatic void __exit omap_dma_exit(void) 6627bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King{ 6637bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King platform_device_unregister(pdev); 6647bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King platform_driver_unregister(&omap_dma_driver); 6657bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King} 6667bedaa5537604f34d1d63c5ec7891e559d2a61edRussell Kingmodule_exit(omap_dma_exit); 6677bedaa5537604f34d1d63c5ec7891e559d2a61edRussell King 6687bedaa5537604f34d1d63c5ec7891e559d2a61edRussell KingMODULE_AUTHOR("Russell King"); 6697bedaa5537604f34d1d63c5ec7891e559d2a61edRussell KingMODULE_LICENSE("GPL"); 670