18dcc8f72SMian Yousaf Kaukab /* 28dcc8f72SMian Yousaf Kaukab * drivers/usb/musb/ux500_dma.c 38dcc8f72SMian Yousaf Kaukab * 43ee1f2e6SFabio Baltieri * U8500 DMA support code 58dcc8f72SMian Yousaf Kaukab * 68dcc8f72SMian Yousaf Kaukab * Copyright (C) 2009 STMicroelectronics 78dcc8f72SMian Yousaf Kaukab * Copyright (C) 2011 ST-Ericsson SA 88dcc8f72SMian Yousaf Kaukab * Authors: 98dcc8f72SMian Yousaf Kaukab * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com> 108dcc8f72SMian Yousaf Kaukab * Praveena Nadahally <praveen.nadahally@stericsson.com> 118dcc8f72SMian Yousaf Kaukab * Rajaram Regupathy <ragupathy.rajaram@stericsson.com> 128dcc8f72SMian Yousaf Kaukab * 138dcc8f72SMian Yousaf Kaukab * This program is free software: you can redistribute it and/or modify 148dcc8f72SMian Yousaf Kaukab * it under the terms of the GNU General Public License as published by 158dcc8f72SMian Yousaf Kaukab * the Free Software Foundation, either version 2 of the License, or 168dcc8f72SMian Yousaf Kaukab * (at your option) any later version. 178dcc8f72SMian Yousaf Kaukab * 188dcc8f72SMian Yousaf Kaukab * This program is distributed in the hope that it will be useful, 198dcc8f72SMian Yousaf Kaukab * but WITHOUT ANY WARRANTY; without even the implied warranty of 208dcc8f72SMian Yousaf Kaukab * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 218dcc8f72SMian Yousaf Kaukab * GNU General Public License for more details. 228dcc8f72SMian Yousaf Kaukab * 238dcc8f72SMian Yousaf Kaukab * You should have received a copy of the GNU General Public License 248dcc8f72SMian Yousaf Kaukab * along with this program. If not, see <http://www.gnu.org/licenses/>. 258dcc8f72SMian Yousaf Kaukab */ 268dcc8f72SMian Yousaf Kaukab 278dcc8f72SMian Yousaf Kaukab #include <linux/device.h> 288dcc8f72SMian Yousaf Kaukab #include <linux/interrupt.h> 298dcc8f72SMian Yousaf Kaukab #include <linux/platform_device.h> 308dcc8f72SMian Yousaf Kaukab #include <linux/dma-mapping.h> 318dcc8f72SMian Yousaf Kaukab #include <linux/dmaengine.h> 328dcc8f72SMian Yousaf Kaukab #include <linux/pfn.h> 330f53e481SFelipe Balbi #include <linux/sizes.h> 34db298da2SArnd Bergmann #include <linux/platform_data/usb-musb-ux500.h> 358dcc8f72SMian Yousaf Kaukab #include "musb_core.h" 368dcc8f72SMian Yousaf Kaukab 372968da0bSLee Jones static const char *iep_chan_names[] = { "iep_1_9", "iep_2_10", "iep_3_11", "iep_4_12", 382968da0bSLee Jones "iep_5_13", "iep_6_14", "iep_7_15", "iep_8" }; 392968da0bSLee Jones static const char *oep_chan_names[] = { "oep_1_9", "oep_2_10", "oep_3_11", "oep_4_12", 402968da0bSLee Jones "oep_5_13", "oep_6_14", "oep_7_15", "oep_8" }; 412968da0bSLee Jones 428dcc8f72SMian Yousaf Kaukab struct ux500_dma_channel { 438dcc8f72SMian Yousaf Kaukab struct dma_channel channel; 448dcc8f72SMian Yousaf Kaukab struct ux500_dma_controller *controller; 458dcc8f72SMian Yousaf Kaukab struct musb_hw_ep *hw_ep; 468dcc8f72SMian Yousaf Kaukab struct dma_chan *dma_chan; 478dcc8f72SMian Yousaf Kaukab unsigned int cur_len; 488dcc8f72SMian Yousaf Kaukab dma_cookie_t cookie; 498dcc8f72SMian Yousaf Kaukab u8 ch_num; 508dcc8f72SMian Yousaf Kaukab u8 is_tx; 518dcc8f72SMian Yousaf Kaukab u8 is_allocated; 528dcc8f72SMian Yousaf Kaukab }; 538dcc8f72SMian Yousaf Kaukab 548dcc8f72SMian Yousaf Kaukab struct ux500_dma_controller { 558dcc8f72SMian Yousaf Kaukab struct dma_controller controller; 56be2dbb09SLee Jones struct ux500_dma_channel rx_channel[UX500_MUSB_DMA_NUM_RX_TX_CHANNELS]; 57be2dbb09SLee Jones struct ux500_dma_channel tx_channel[UX500_MUSB_DMA_NUM_RX_TX_CHANNELS]; 588dcc8f72SMian Yousaf Kaukab void *private_data; 598dcc8f72SMian Yousaf Kaukab dma_addr_t phy_base; 608dcc8f72SMian Yousaf Kaukab }; 618dcc8f72SMian Yousaf Kaukab 628dcc8f72SMian Yousaf Kaukab /* Work function invoked from DMA callback to handle rx transfers. */ 636b0cfc65SFelipe Balbi static void ux500_dma_callback(void *private_data) 648dcc8f72SMian Yousaf Kaukab { 65be18a251SPer Forlin struct dma_channel *channel = private_data; 66be18a251SPer Forlin struct ux500_dma_channel *ux500_channel = channel->private_data; 678dcc8f72SMian Yousaf Kaukab struct musb_hw_ep *hw_ep = ux500_channel->hw_ep; 688dcc8f72SMian Yousaf Kaukab struct musb *musb = hw_ep->musb; 698dcc8f72SMian Yousaf Kaukab unsigned long flags; 708dcc8f72SMian Yousaf Kaukab 71afbd0749SPer Forlin dev_dbg(musb->controller, "DMA rx transfer done on hw_ep=%d\n", 72afbd0749SPer Forlin hw_ep->epnum); 738dcc8f72SMian Yousaf Kaukab 748dcc8f72SMian Yousaf Kaukab spin_lock_irqsave(&musb->lock, flags); 758dcc8f72SMian Yousaf Kaukab ux500_channel->channel.actual_len = ux500_channel->cur_len; 768dcc8f72SMian Yousaf Kaukab ux500_channel->channel.status = MUSB_DMA_STATUS_FREE; 773147dad6SFabio Baltieri musb_dma_completion(musb, hw_ep->epnum, ux500_channel->is_tx); 788dcc8f72SMian Yousaf Kaukab spin_unlock_irqrestore(&musb->lock, flags); 798dcc8f72SMian Yousaf Kaukab 808dcc8f72SMian Yousaf Kaukab } 818dcc8f72SMian Yousaf Kaukab 828dcc8f72SMian Yousaf Kaukab static bool ux500_configure_channel(struct dma_channel *channel, 838dcc8f72SMian Yousaf Kaukab u16 packet_sz, u8 mode, 848dcc8f72SMian Yousaf Kaukab dma_addr_t dma_addr, u32 len) 858dcc8f72SMian Yousaf Kaukab { 868dcc8f72SMian Yousaf Kaukab struct ux500_dma_channel *ux500_channel = channel->private_data; 878dcc8f72SMian Yousaf Kaukab struct musb_hw_ep *hw_ep = ux500_channel->hw_ep; 888dcc8f72SMian Yousaf Kaukab struct dma_chan *dma_chan = ux500_channel->dma_chan; 898dcc8f72SMian Yousaf Kaukab struct dma_async_tx_descriptor *dma_desc; 908341544cSVinod Koul enum dma_transfer_direction direction; 918dcc8f72SMian Yousaf Kaukab struct scatterlist sg; 928dcc8f72SMian Yousaf Kaukab struct dma_slave_config slave_conf; 938dcc8f72SMian Yousaf Kaukab enum dma_slave_buswidth addr_width; 948dcc8f72SMian Yousaf Kaukab dma_addr_t usb_fifo_addr = (MUSB_FIFO_OFFSET(hw_ep->epnum) + 958dcc8f72SMian Yousaf Kaukab ux500_channel->controller->phy_base); 96afbd0749SPer Forlin struct musb *musb = ux500_channel->controller->private_data; 978dcc8f72SMian Yousaf Kaukab 98afbd0749SPer Forlin dev_dbg(musb->controller, 996a3b0036SFelipe Balbi "packet_sz=%d, mode=%d, dma_addr=0x%llu, len=%d is_tx=%d\n", 1006a3b0036SFelipe Balbi packet_sz, mode, (unsigned long long) dma_addr, 1016a3b0036SFelipe Balbi len, ux500_channel->is_tx); 1028dcc8f72SMian Yousaf Kaukab 1038dcc8f72SMian Yousaf Kaukab ux500_channel->cur_len = len; 1048dcc8f72SMian Yousaf Kaukab 1058dcc8f72SMian Yousaf Kaukab sg_init_table(&sg, 1); 1068dcc8f72SMian Yousaf Kaukab sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_addr)), len, 1078dcc8f72SMian Yousaf Kaukab offset_in_page(dma_addr)); 1088dcc8f72SMian Yousaf Kaukab sg_dma_address(&sg) = dma_addr; 1098dcc8f72SMian Yousaf Kaukab sg_dma_len(&sg) = len; 1108dcc8f72SMian Yousaf Kaukab 1118341544cSVinod Koul direction = ux500_channel->is_tx ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; 1128dcc8f72SMian Yousaf Kaukab addr_width = (len & 0x3) ? DMA_SLAVE_BUSWIDTH_1_BYTE : 1138dcc8f72SMian Yousaf Kaukab DMA_SLAVE_BUSWIDTH_4_BYTES; 1148dcc8f72SMian Yousaf Kaukab 1158dcc8f72SMian Yousaf Kaukab slave_conf.direction = direction; 1168dcc8f72SMian Yousaf Kaukab slave_conf.src_addr = usb_fifo_addr; 1178dcc8f72SMian Yousaf Kaukab slave_conf.src_addr_width = addr_width; 1188dcc8f72SMian Yousaf Kaukab slave_conf.src_maxburst = 16; 1198dcc8f72SMian Yousaf Kaukab slave_conf.dst_addr = usb_fifo_addr; 1208dcc8f72SMian Yousaf Kaukab slave_conf.dst_addr_width = addr_width; 1218dcc8f72SMian Yousaf Kaukab slave_conf.dst_maxburst = 16; 122258aea76SViresh Kumar slave_conf.device_fc = false; 123d366d39bSPer Forlin 1248dcc8f72SMian Yousaf Kaukab dma_chan->device->device_control(dma_chan, DMA_SLAVE_CONFIG, 1258dcc8f72SMian Yousaf Kaukab (unsigned long) &slave_conf); 1268dcc8f72SMian Yousaf Kaukab 12716052827SAlexandre Bounine dma_desc = dmaengine_prep_slave_sg(dma_chan, &sg, 1, direction, 1288dcc8f72SMian Yousaf Kaukab DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 1298dcc8f72SMian Yousaf Kaukab if (!dma_desc) 1308dcc8f72SMian Yousaf Kaukab return false; 1318dcc8f72SMian Yousaf Kaukab 1328dcc8f72SMian Yousaf Kaukab dma_desc->callback = ux500_dma_callback; 1338dcc8f72SMian Yousaf Kaukab dma_desc->callback_param = channel; 1348dcc8f72SMian Yousaf Kaukab ux500_channel->cookie = dma_desc->tx_submit(dma_desc); 1358dcc8f72SMian Yousaf Kaukab 1368dcc8f72SMian Yousaf Kaukab dma_async_issue_pending(dma_chan); 1378dcc8f72SMian Yousaf Kaukab 1388dcc8f72SMian Yousaf Kaukab return true; 1398dcc8f72SMian Yousaf Kaukab } 1408dcc8f72SMian Yousaf Kaukab 1418dcc8f72SMian Yousaf Kaukab static struct dma_channel *ux500_dma_channel_allocate(struct dma_controller *c, 1428dcc8f72SMian Yousaf Kaukab struct musb_hw_ep *hw_ep, u8 is_tx) 1438dcc8f72SMian Yousaf Kaukab { 1448dcc8f72SMian Yousaf Kaukab struct ux500_dma_controller *controller = container_of(c, 1458dcc8f72SMian Yousaf Kaukab struct ux500_dma_controller, controller); 1468dcc8f72SMian Yousaf Kaukab struct ux500_dma_channel *ux500_channel = NULL; 147afbd0749SPer Forlin struct musb *musb = controller->private_data; 1488dcc8f72SMian Yousaf Kaukab u8 ch_num = hw_ep->epnum - 1; 1498dcc8f72SMian Yousaf Kaukab 150be2dbb09SLee Jones /* 8 DMA channels (0 - 7). Each DMA channel can only be allocated 1518dcc8f72SMian Yousaf Kaukab * to specified hw_ep. For example DMA channel 0 can only be allocated 1528dcc8f72SMian Yousaf Kaukab * to hw_ep 1 and 9. 1538dcc8f72SMian Yousaf Kaukab */ 1548dcc8f72SMian Yousaf Kaukab if (ch_num > 7) 1558dcc8f72SMian Yousaf Kaukab ch_num -= 8; 1568dcc8f72SMian Yousaf Kaukab 157be2dbb09SLee Jones if (ch_num >= UX500_MUSB_DMA_NUM_RX_TX_CHANNELS) 1588dcc8f72SMian Yousaf Kaukab return NULL; 1598dcc8f72SMian Yousaf Kaukab 1608dcc8f72SMian Yousaf Kaukab ux500_channel = is_tx ? &(controller->tx_channel[ch_num]) : 1618dcc8f72SMian Yousaf Kaukab &(controller->rx_channel[ch_num]) ; 1628dcc8f72SMian Yousaf Kaukab 1638dcc8f72SMian Yousaf Kaukab /* Check if channel is already used. */ 1648dcc8f72SMian Yousaf Kaukab if (ux500_channel->is_allocated) 1658dcc8f72SMian Yousaf Kaukab return NULL; 1668dcc8f72SMian Yousaf Kaukab 1678dcc8f72SMian Yousaf Kaukab ux500_channel->hw_ep = hw_ep; 1688dcc8f72SMian Yousaf Kaukab ux500_channel->is_allocated = 1; 1698dcc8f72SMian Yousaf Kaukab 170afbd0749SPer Forlin dev_dbg(musb->controller, "hw_ep=%d, is_tx=0x%x, channel=%d\n", 1718dcc8f72SMian Yousaf Kaukab hw_ep->epnum, is_tx, ch_num); 1728dcc8f72SMian Yousaf Kaukab 1738dcc8f72SMian Yousaf Kaukab return &(ux500_channel->channel); 1748dcc8f72SMian Yousaf Kaukab } 1758dcc8f72SMian Yousaf Kaukab 1768dcc8f72SMian Yousaf Kaukab static void ux500_dma_channel_release(struct dma_channel *channel) 1778dcc8f72SMian Yousaf Kaukab { 1788dcc8f72SMian Yousaf Kaukab struct ux500_dma_channel *ux500_channel = channel->private_data; 179afbd0749SPer Forlin struct musb *musb = ux500_channel->controller->private_data; 1808dcc8f72SMian Yousaf Kaukab 181afbd0749SPer Forlin dev_dbg(musb->controller, "channel=%d\n", ux500_channel->ch_num); 1828dcc8f72SMian Yousaf Kaukab 1838dcc8f72SMian Yousaf Kaukab if (ux500_channel->is_allocated) { 1848dcc8f72SMian Yousaf Kaukab ux500_channel->is_allocated = 0; 1858dcc8f72SMian Yousaf Kaukab channel->status = MUSB_DMA_STATUS_FREE; 1868dcc8f72SMian Yousaf Kaukab channel->actual_len = 0; 1878dcc8f72SMian Yousaf Kaukab } 1888dcc8f72SMian Yousaf Kaukab } 1898dcc8f72SMian Yousaf Kaukab 1908dcc8f72SMian Yousaf Kaukab static int ux500_dma_is_compatible(struct dma_channel *channel, 1918dcc8f72SMian Yousaf Kaukab u16 maxpacket, void *buf, u32 length) 1928dcc8f72SMian Yousaf Kaukab { 1938dcc8f72SMian Yousaf Kaukab if ((maxpacket & 0x3) || 1946a3b0036SFelipe Balbi ((unsigned long int) buf & 0x3) || 1958dcc8f72SMian Yousaf Kaukab (length < 512) || 1968dcc8f72SMian Yousaf Kaukab (length & 0x3)) 1978dcc8f72SMian Yousaf Kaukab return false; 1988dcc8f72SMian Yousaf Kaukab else 1998dcc8f72SMian Yousaf Kaukab return true; 2008dcc8f72SMian Yousaf Kaukab } 2018dcc8f72SMian Yousaf Kaukab 2028dcc8f72SMian Yousaf Kaukab static int ux500_dma_channel_program(struct dma_channel *channel, 2038dcc8f72SMian Yousaf Kaukab u16 packet_sz, u8 mode, 2048dcc8f72SMian Yousaf Kaukab dma_addr_t dma_addr, u32 len) 2058dcc8f72SMian Yousaf Kaukab { 2068dcc8f72SMian Yousaf Kaukab int ret; 2078dcc8f72SMian Yousaf Kaukab 2088dcc8f72SMian Yousaf Kaukab BUG_ON(channel->status == MUSB_DMA_STATUS_UNKNOWN || 2098dcc8f72SMian Yousaf Kaukab channel->status == MUSB_DMA_STATUS_BUSY); 2108dcc8f72SMian Yousaf Kaukab 2118dcc8f72SMian Yousaf Kaukab if (!ux500_dma_is_compatible(channel, packet_sz, (void *)dma_addr, len)) 2128dcc8f72SMian Yousaf Kaukab return false; 2138dcc8f72SMian Yousaf Kaukab 2148dcc8f72SMian Yousaf Kaukab channel->status = MUSB_DMA_STATUS_BUSY; 2158dcc8f72SMian Yousaf Kaukab channel->actual_len = 0; 2168dcc8f72SMian Yousaf Kaukab ret = ux500_configure_channel(channel, packet_sz, mode, dma_addr, len); 2178dcc8f72SMian Yousaf Kaukab if (!ret) 2188dcc8f72SMian Yousaf Kaukab channel->status = MUSB_DMA_STATUS_FREE; 2198dcc8f72SMian Yousaf Kaukab 2208dcc8f72SMian Yousaf Kaukab return ret; 2218dcc8f72SMian Yousaf Kaukab } 2228dcc8f72SMian Yousaf Kaukab 2238dcc8f72SMian Yousaf Kaukab static int ux500_dma_channel_abort(struct dma_channel *channel) 2248dcc8f72SMian Yousaf Kaukab { 2258dcc8f72SMian Yousaf Kaukab struct ux500_dma_channel *ux500_channel = channel->private_data; 2268dcc8f72SMian Yousaf Kaukab struct ux500_dma_controller *controller = ux500_channel->controller; 2278dcc8f72SMian Yousaf Kaukab struct musb *musb = controller->private_data; 2288dcc8f72SMian Yousaf Kaukab void __iomem *epio = musb->endpoints[ux500_channel->hw_ep->epnum].regs; 2298dcc8f72SMian Yousaf Kaukab u16 csr; 2308dcc8f72SMian Yousaf Kaukab 231afbd0749SPer Forlin dev_dbg(musb->controller, "channel=%d, is_tx=%d\n", 232afbd0749SPer Forlin ux500_channel->ch_num, ux500_channel->is_tx); 2338dcc8f72SMian Yousaf Kaukab 2348dcc8f72SMian Yousaf Kaukab if (channel->status == MUSB_DMA_STATUS_BUSY) { 2358dcc8f72SMian Yousaf Kaukab if (ux500_channel->is_tx) { 2368dcc8f72SMian Yousaf Kaukab csr = musb_readw(epio, MUSB_TXCSR); 2378dcc8f72SMian Yousaf Kaukab csr &= ~(MUSB_TXCSR_AUTOSET | 2388dcc8f72SMian Yousaf Kaukab MUSB_TXCSR_DMAENAB | 2398dcc8f72SMian Yousaf Kaukab MUSB_TXCSR_DMAMODE); 2408dcc8f72SMian Yousaf Kaukab musb_writew(epio, MUSB_TXCSR, csr); 2418dcc8f72SMian Yousaf Kaukab } else { 2428dcc8f72SMian Yousaf Kaukab csr = musb_readw(epio, MUSB_RXCSR); 2438dcc8f72SMian Yousaf Kaukab csr &= ~(MUSB_RXCSR_AUTOCLEAR | 2448dcc8f72SMian Yousaf Kaukab MUSB_RXCSR_DMAENAB | 2458dcc8f72SMian Yousaf Kaukab MUSB_RXCSR_DMAMODE); 2468dcc8f72SMian Yousaf Kaukab musb_writew(epio, MUSB_RXCSR, csr); 2478dcc8f72SMian Yousaf Kaukab } 2488dcc8f72SMian Yousaf Kaukab 2498dcc8f72SMian Yousaf Kaukab ux500_channel->dma_chan->device-> 2508dcc8f72SMian Yousaf Kaukab device_control(ux500_channel->dma_chan, 2518dcc8f72SMian Yousaf Kaukab DMA_TERMINATE_ALL, 0); 2528dcc8f72SMian Yousaf Kaukab channel->status = MUSB_DMA_STATUS_FREE; 2538dcc8f72SMian Yousaf Kaukab } 2548dcc8f72SMian Yousaf Kaukab return 0; 2558dcc8f72SMian Yousaf Kaukab } 2568dcc8f72SMian Yousaf Kaukab 25766c01883SSebastian Andrzej Siewior static void ux500_dma_controller_stop(struct ux500_dma_controller *controller) 2588dcc8f72SMian Yousaf Kaukab { 2598dcc8f72SMian Yousaf Kaukab struct ux500_dma_channel *ux500_channel; 2608dcc8f72SMian Yousaf Kaukab struct dma_channel *channel; 2618dcc8f72SMian Yousaf Kaukab u8 ch_num; 2628dcc8f72SMian Yousaf Kaukab 263be2dbb09SLee Jones for (ch_num = 0; ch_num < UX500_MUSB_DMA_NUM_RX_TX_CHANNELS; ch_num++) { 2648dcc8f72SMian Yousaf Kaukab channel = &controller->rx_channel[ch_num].channel; 2658dcc8f72SMian Yousaf Kaukab ux500_channel = channel->private_data; 2668dcc8f72SMian Yousaf Kaukab 2678dcc8f72SMian Yousaf Kaukab ux500_dma_channel_release(channel); 2688dcc8f72SMian Yousaf Kaukab 2698dcc8f72SMian Yousaf Kaukab if (ux500_channel->dma_chan) 2708dcc8f72SMian Yousaf Kaukab dma_release_channel(ux500_channel->dma_chan); 2718dcc8f72SMian Yousaf Kaukab } 2728dcc8f72SMian Yousaf Kaukab 273be2dbb09SLee Jones for (ch_num = 0; ch_num < UX500_MUSB_DMA_NUM_RX_TX_CHANNELS; ch_num++) { 2748dcc8f72SMian Yousaf Kaukab channel = &controller->tx_channel[ch_num].channel; 2758dcc8f72SMian Yousaf Kaukab ux500_channel = channel->private_data; 2768dcc8f72SMian Yousaf Kaukab 2778dcc8f72SMian Yousaf Kaukab ux500_dma_channel_release(channel); 2788dcc8f72SMian Yousaf Kaukab 2798dcc8f72SMian Yousaf Kaukab if (ux500_channel->dma_chan) 2808dcc8f72SMian Yousaf Kaukab dma_release_channel(ux500_channel->dma_chan); 2818dcc8f72SMian Yousaf Kaukab } 2828dcc8f72SMian Yousaf Kaukab } 2838dcc8f72SMian Yousaf Kaukab 28466c01883SSebastian Andrzej Siewior static int ux500_dma_controller_start(struct ux500_dma_controller *controller) 2858dcc8f72SMian Yousaf Kaukab { 2868dcc8f72SMian Yousaf Kaukab struct ux500_dma_channel *ux500_channel = NULL; 2878dcc8f72SMian Yousaf Kaukab struct musb *musb = controller->private_data; 2888dcc8f72SMian Yousaf Kaukab struct device *dev = musb->controller; 289c1a7d67cSJingoo Han struct musb_hdrc_platform_data *plat = dev_get_platdata(dev); 2905f6091a0SLee Jones struct ux500_musb_board_data *data; 2918dcc8f72SMian Yousaf Kaukab struct dma_channel *dma_channel = NULL; 2922968da0bSLee Jones char **chan_names; 2938dcc8f72SMian Yousaf Kaukab u32 ch_num; 2948dcc8f72SMian Yousaf Kaukab u8 dir; 2958dcc8f72SMian Yousaf Kaukab u8 is_tx = 0; 2968dcc8f72SMian Yousaf Kaukab 2978dcc8f72SMian Yousaf Kaukab void **param_array; 2988dcc8f72SMian Yousaf Kaukab struct ux500_dma_channel *channel_array; 2998dcc8f72SMian Yousaf Kaukab dma_cap_mask_t mask; 3008dcc8f72SMian Yousaf Kaukab 3015f6091a0SLee Jones if (!plat) { 3025f6091a0SLee Jones dev_err(musb->controller, "No platform data\n"); 3038dcc8f72SMian Yousaf Kaukab return -EINVAL; 3045f6091a0SLee Jones } 3058dcc8f72SMian Yousaf Kaukab 3065f6091a0SLee Jones data = plat->board_data; 3078dcc8f72SMian Yousaf Kaukab 3088dcc8f72SMian Yousaf Kaukab dma_cap_zero(mask); 3098dcc8f72SMian Yousaf Kaukab dma_cap_set(DMA_SLAVE, mask); 3108dcc8f72SMian Yousaf Kaukab 3118dcc8f72SMian Yousaf Kaukab /* Prepare the loop for RX channels */ 3128dcc8f72SMian Yousaf Kaukab channel_array = controller->rx_channel; 3135f6091a0SLee Jones param_array = data ? data->dma_rx_param_array : NULL; 3142968da0bSLee Jones chan_names = (char **)iep_chan_names; 3158dcc8f72SMian Yousaf Kaukab 3168dcc8f72SMian Yousaf Kaukab for (dir = 0; dir < 2; dir++) { 317be2dbb09SLee Jones for (ch_num = 0; 318be2dbb09SLee Jones ch_num < UX500_MUSB_DMA_NUM_RX_TX_CHANNELS; 319be2dbb09SLee Jones ch_num++) { 3208dcc8f72SMian Yousaf Kaukab ux500_channel = &channel_array[ch_num]; 3218dcc8f72SMian Yousaf Kaukab ux500_channel->controller = controller; 3228dcc8f72SMian Yousaf Kaukab ux500_channel->ch_num = ch_num; 3238dcc8f72SMian Yousaf Kaukab ux500_channel->is_tx = is_tx; 3248dcc8f72SMian Yousaf Kaukab 3258dcc8f72SMian Yousaf Kaukab dma_channel = &(ux500_channel->channel); 3268dcc8f72SMian Yousaf Kaukab dma_channel->private_data = ux500_channel; 3278dcc8f72SMian Yousaf Kaukab dma_channel->status = MUSB_DMA_STATUS_FREE; 3288dcc8f72SMian Yousaf Kaukab dma_channel->max_len = SZ_16M; 3298dcc8f72SMian Yousaf Kaukab 3302968da0bSLee Jones ux500_channel->dma_chan = 3312968da0bSLee Jones dma_request_slave_channel(dev, chan_names[ch_num]); 3322968da0bSLee Jones 3332968da0bSLee Jones if (!ux500_channel->dma_chan) 3342968da0bSLee Jones ux500_channel->dma_chan = 3352968da0bSLee Jones dma_request_channel(mask, 3360f2aa8caSLee Jones data ? 3370f2aa8caSLee Jones data->dma_filter : 3380f2aa8caSLee Jones NULL, 3398dcc8f72SMian Yousaf Kaukab param_array[ch_num]); 3402968da0bSLee Jones 3418dcc8f72SMian Yousaf Kaukab if (!ux500_channel->dma_chan) { 3428dcc8f72SMian Yousaf Kaukab ERR("Dma pipe allocation error dir=%d ch=%d\n", 3438dcc8f72SMian Yousaf Kaukab dir, ch_num); 3448dcc8f72SMian Yousaf Kaukab 3458dcc8f72SMian Yousaf Kaukab /* Release already allocated channels */ 34666c01883SSebastian Andrzej Siewior ux500_dma_controller_stop(controller); 3478dcc8f72SMian Yousaf Kaukab 3488dcc8f72SMian Yousaf Kaukab return -EBUSY; 3498dcc8f72SMian Yousaf Kaukab } 3508dcc8f72SMian Yousaf Kaukab 3518dcc8f72SMian Yousaf Kaukab } 3528dcc8f72SMian Yousaf Kaukab 3538dcc8f72SMian Yousaf Kaukab /* Prepare the loop for TX channels */ 3548dcc8f72SMian Yousaf Kaukab channel_array = controller->tx_channel; 3555f6091a0SLee Jones param_array = data ? data->dma_tx_param_array : NULL; 3562968da0bSLee Jones chan_names = (char **)oep_chan_names; 3578dcc8f72SMian Yousaf Kaukab is_tx = 1; 3588dcc8f72SMian Yousaf Kaukab } 3598dcc8f72SMian Yousaf Kaukab 3608dcc8f72SMian Yousaf Kaukab return 0; 3618dcc8f72SMian Yousaf Kaukab } 3628dcc8f72SMian Yousaf Kaukab 3638dcc8f72SMian Yousaf Kaukab void dma_controller_destroy(struct dma_controller *c) 3648dcc8f72SMian Yousaf Kaukab { 3658dcc8f72SMian Yousaf Kaukab struct ux500_dma_controller *controller = container_of(c, 3668dcc8f72SMian Yousaf Kaukab struct ux500_dma_controller, controller); 3678dcc8f72SMian Yousaf Kaukab 36866c01883SSebastian Andrzej Siewior ux500_dma_controller_stop(controller); 3698dcc8f72SMian Yousaf Kaukab kfree(controller); 3708dcc8f72SMian Yousaf Kaukab } 3718dcc8f72SMian Yousaf Kaukab 3723147dad6SFabio Baltieri struct dma_controller *dma_controller_create(struct musb *musb, 3733147dad6SFabio Baltieri void __iomem *base) 3748dcc8f72SMian Yousaf Kaukab { 3758dcc8f72SMian Yousaf Kaukab struct ux500_dma_controller *controller; 3768dcc8f72SMian Yousaf Kaukab struct platform_device *pdev = to_platform_device(musb->controller); 3778dcc8f72SMian Yousaf Kaukab struct resource *iomem; 37866c01883SSebastian Andrzej Siewior int ret; 3798dcc8f72SMian Yousaf Kaukab 3808dcc8f72SMian Yousaf Kaukab controller = kzalloc(sizeof(*controller), GFP_KERNEL); 3818dcc8f72SMian Yousaf Kaukab if (!controller) 382399e0f4fSVirupax Sadashivpetimath goto kzalloc_fail; 3838dcc8f72SMian Yousaf Kaukab 3848dcc8f72SMian Yousaf Kaukab controller->private_data = musb; 3858dcc8f72SMian Yousaf Kaukab 3868dcc8f72SMian Yousaf Kaukab /* Save physical address for DMA controller. */ 3878dcc8f72SMian Yousaf Kaukab iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 388399e0f4fSVirupax Sadashivpetimath if (!iomem) { 389399e0f4fSVirupax Sadashivpetimath dev_err(musb->controller, "no memory resource defined\n"); 390399e0f4fSVirupax Sadashivpetimath goto plat_get_fail; 391399e0f4fSVirupax Sadashivpetimath } 392399e0f4fSVirupax Sadashivpetimath 3938dcc8f72SMian Yousaf Kaukab controller->phy_base = (dma_addr_t) iomem->start; 3948dcc8f72SMian Yousaf Kaukab 3958dcc8f72SMian Yousaf Kaukab controller->controller.channel_alloc = ux500_dma_channel_allocate; 3968dcc8f72SMian Yousaf Kaukab controller->controller.channel_release = ux500_dma_channel_release; 3978dcc8f72SMian Yousaf Kaukab controller->controller.channel_program = ux500_dma_channel_program; 3988dcc8f72SMian Yousaf Kaukab controller->controller.channel_abort = ux500_dma_channel_abort; 3998dcc8f72SMian Yousaf Kaukab controller->controller.is_compatible = ux500_dma_is_compatible; 4008dcc8f72SMian Yousaf Kaukab 40166c01883SSebastian Andrzej Siewior ret = ux500_dma_controller_start(controller); 40266c01883SSebastian Andrzej Siewior if (ret) 40366c01883SSebastian Andrzej Siewior goto plat_get_fail; 4048dcc8f72SMian Yousaf Kaukab return &controller->controller; 405399e0f4fSVirupax Sadashivpetimath 406399e0f4fSVirupax Sadashivpetimath plat_get_fail: 407399e0f4fSVirupax Sadashivpetimath kfree(controller); 408399e0f4fSVirupax Sadashivpetimath kzalloc_fail: 409399e0f4fSVirupax Sadashivpetimath return NULL; 4108dcc8f72SMian Yousaf Kaukab } 411