1901fd852SWolfram Sang // SPDX-License-Identifier: GPL-2.0 20c1c8ff3SYoshihiro Shimoda /* 30c1c8ff3SYoshihiro Shimoda * Renesas USB DMA Controller Driver 40c1c8ff3SYoshihiro Shimoda * 50c1c8ff3SYoshihiro Shimoda * Copyright (C) 2015 Renesas Electronics Corporation 60c1c8ff3SYoshihiro Shimoda * 70c1c8ff3SYoshihiro Shimoda * based on rcar-dmac.c 80c1c8ff3SYoshihiro Shimoda * Copyright (C) 2014 Renesas Electronics Inc. 90c1c8ff3SYoshihiro Shimoda * Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com> 100c1c8ff3SYoshihiro Shimoda */ 110c1c8ff3SYoshihiro Shimoda 120c1c8ff3SYoshihiro Shimoda #include <linux/delay.h> 130c1c8ff3SYoshihiro Shimoda #include <linux/dma-mapping.h> 140c1c8ff3SYoshihiro Shimoda #include <linux/dmaengine.h> 150c1c8ff3SYoshihiro Shimoda #include <linux/interrupt.h> 160c1c8ff3SYoshihiro Shimoda #include <linux/list.h> 170c1c8ff3SYoshihiro Shimoda #include <linux/module.h> 180c1c8ff3SYoshihiro Shimoda #include <linux/of.h> 190c1c8ff3SYoshihiro Shimoda #include <linux/of_dma.h> 200c1c8ff3SYoshihiro Shimoda #include <linux/of_platform.h> 210c1c8ff3SYoshihiro Shimoda #include <linux/platform_device.h> 220c1c8ff3SYoshihiro Shimoda #include <linux/pm_runtime.h> 230c1c8ff3SYoshihiro Shimoda #include <linux/slab.h> 240c1c8ff3SYoshihiro Shimoda #include <linux/spinlock.h> 250c1c8ff3SYoshihiro Shimoda 260c1c8ff3SYoshihiro Shimoda #include "../dmaengine.h" 270c1c8ff3SYoshihiro Shimoda #include "../virt-dma.h" 280c1c8ff3SYoshihiro Shimoda 290c1c8ff3SYoshihiro Shimoda /* 300c1c8ff3SYoshihiro Shimoda * struct usb_dmac_sg - Descriptor for a hardware transfer 310c1c8ff3SYoshihiro Shimoda * @mem_addr: memory address 320c1c8ff3SYoshihiro Shimoda * @size: transfer size in bytes 330c1c8ff3SYoshihiro Shimoda */ 340c1c8ff3SYoshihiro Shimoda struct usb_dmac_sg { 350c1c8ff3SYoshihiro Shimoda dma_addr_t mem_addr; 360c1c8ff3SYoshihiro Shimoda u32 size; 370c1c8ff3SYoshihiro Shimoda }; 380c1c8ff3SYoshihiro Shimoda 390c1c8ff3SYoshihiro Shimoda /* 400c1c8ff3SYoshihiro Shimoda * struct usb_dmac_desc - USB DMA Transfer Descriptor 410c1c8ff3SYoshihiro Shimoda * @vd: base virtual channel DMA transaction descriptor 420c1c8ff3SYoshihiro Shimoda * @direction: direction of the DMA transfer 430c1c8ff3SYoshihiro Shimoda * @sg_allocated_len: length of allocated sg 440c1c8ff3SYoshihiro Shimoda * @sg_len: length of sg 450c1c8ff3SYoshihiro Shimoda * @sg_index: index of sg 460c1c8ff3SYoshihiro Shimoda * @residue: residue after the DMAC completed a transfer 470c1c8ff3SYoshihiro Shimoda * @node: node for desc_got and desc_freed 480c1c8ff3SYoshihiro Shimoda * @done_cookie: cookie after the DMAC completed a transfer 490c1c8ff3SYoshihiro Shimoda * @sg: information for the transfer 500c1c8ff3SYoshihiro Shimoda */ 510c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc { 520c1c8ff3SYoshihiro Shimoda struct virt_dma_desc vd; 530c1c8ff3SYoshihiro Shimoda enum dma_transfer_direction direction; 540c1c8ff3SYoshihiro Shimoda unsigned int sg_allocated_len; 550c1c8ff3SYoshihiro Shimoda unsigned int sg_len; 560c1c8ff3SYoshihiro Shimoda unsigned int sg_index; 570c1c8ff3SYoshihiro Shimoda u32 residue; 580c1c8ff3SYoshihiro Shimoda struct list_head node; 590c1c8ff3SYoshihiro Shimoda dma_cookie_t done_cookie; 600c1c8ff3SYoshihiro Shimoda struct usb_dmac_sg sg[0]; 610c1c8ff3SYoshihiro Shimoda }; 620c1c8ff3SYoshihiro Shimoda 630c1c8ff3SYoshihiro Shimoda #define to_usb_dmac_desc(vd) container_of(vd, struct usb_dmac_desc, vd) 640c1c8ff3SYoshihiro Shimoda 650c1c8ff3SYoshihiro Shimoda /* 660c1c8ff3SYoshihiro Shimoda * struct usb_dmac_chan - USB DMA Controller Channel 670c1c8ff3SYoshihiro Shimoda * @vc: base virtual DMA channel object 680c1c8ff3SYoshihiro Shimoda * @iomem: channel I/O memory base 690c1c8ff3SYoshihiro Shimoda * @index: index of this channel in the controller 700c1c8ff3SYoshihiro Shimoda * @irq: irq number of this channel 710c1c8ff3SYoshihiro Shimoda * @desc: the current descriptor 720c1c8ff3SYoshihiro Shimoda * @descs_allocated: number of descriptors allocated 730c1c8ff3SYoshihiro Shimoda * @desc_got: got descriptors 740c1c8ff3SYoshihiro Shimoda * @desc_freed: freed descriptors after the DMAC completed a transfer 750c1c8ff3SYoshihiro Shimoda */ 760c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan { 770c1c8ff3SYoshihiro Shimoda struct virt_dma_chan vc; 780c1c8ff3SYoshihiro Shimoda void __iomem *iomem; 790c1c8ff3SYoshihiro Shimoda unsigned int index; 800c1c8ff3SYoshihiro Shimoda int irq; 810c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc; 820c1c8ff3SYoshihiro Shimoda int descs_allocated; 830c1c8ff3SYoshihiro Shimoda struct list_head desc_got; 840c1c8ff3SYoshihiro Shimoda struct list_head desc_freed; 850c1c8ff3SYoshihiro Shimoda }; 860c1c8ff3SYoshihiro Shimoda 870c1c8ff3SYoshihiro Shimoda #define to_usb_dmac_chan(c) container_of(c, struct usb_dmac_chan, vc.chan) 880c1c8ff3SYoshihiro Shimoda 890c1c8ff3SYoshihiro Shimoda /* 900c1c8ff3SYoshihiro Shimoda * struct usb_dmac - USB DMA Controller 910c1c8ff3SYoshihiro Shimoda * @engine: base DMA engine object 920c1c8ff3SYoshihiro Shimoda * @dev: the hardware device 930c1c8ff3SYoshihiro Shimoda * @iomem: remapped I/O memory base 940c1c8ff3SYoshihiro Shimoda * @n_channels: number of available channels 950c1c8ff3SYoshihiro Shimoda * @channels: array of DMAC channels 960c1c8ff3SYoshihiro Shimoda */ 970c1c8ff3SYoshihiro Shimoda struct usb_dmac { 980c1c8ff3SYoshihiro Shimoda struct dma_device engine; 990c1c8ff3SYoshihiro Shimoda struct device *dev; 1000c1c8ff3SYoshihiro Shimoda void __iomem *iomem; 1010c1c8ff3SYoshihiro Shimoda 1020c1c8ff3SYoshihiro Shimoda unsigned int n_channels; 1030c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *channels; 1040c1c8ff3SYoshihiro Shimoda }; 1050c1c8ff3SYoshihiro Shimoda 1060c1c8ff3SYoshihiro Shimoda #define to_usb_dmac(d) container_of(d, struct usb_dmac, engine) 1070c1c8ff3SYoshihiro Shimoda 1080c1c8ff3SYoshihiro Shimoda /* ----------------------------------------------------------------------------- 1090c1c8ff3SYoshihiro Shimoda * Registers 1100c1c8ff3SYoshihiro Shimoda */ 1110c1c8ff3SYoshihiro Shimoda 1120c1c8ff3SYoshihiro Shimoda #define USB_DMAC_CHAN_OFFSET(i) (0x20 + 0x20 * (i)) 1130c1c8ff3SYoshihiro Shimoda 1140c1c8ff3SYoshihiro Shimoda #define USB_DMASWR 0x0008 1150c1c8ff3SYoshihiro Shimoda #define USB_DMASWR_SWR (1 << 0) 1160c1c8ff3SYoshihiro Shimoda #define USB_DMAOR 0x0060 1179a445bbbSHiroyuki Yokoyama #define USB_DMAOR_AE (1 << 1) 1180c1c8ff3SYoshihiro Shimoda #define USB_DMAOR_DME (1 << 0) 1190c1c8ff3SYoshihiro Shimoda 1200c1c8ff3SYoshihiro Shimoda #define USB_DMASAR 0x0000 1210c1c8ff3SYoshihiro Shimoda #define USB_DMADAR 0x0004 1220c1c8ff3SYoshihiro Shimoda #define USB_DMATCR 0x0008 1230c1c8ff3SYoshihiro Shimoda #define USB_DMATCR_MASK 0x00ffffff 1240c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR 0x0014 1250c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR_FTE (1 << 24) 1260c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR_NULLE (1 << 16) 1270c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR_NULL (1 << 12) 1280c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR_TS_8B ((0 << 7) | (0 << 6)) 1290c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR_TS_16B ((0 << 7) | (1 << 6)) 1300c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR_TS_32B ((1 << 7) | (0 << 6)) 1310c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR_IE (1 << 5) 1320c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR_SP (1 << 2) 1330c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR_TE (1 << 1) 1340c1c8ff3SYoshihiro Shimoda #define USB_DMACHCR_DE (1 << 0) 1350c1c8ff3SYoshihiro Shimoda #define USB_DMATEND 0x0018 1360c1c8ff3SYoshihiro Shimoda 1370c1c8ff3SYoshihiro Shimoda /* Hardcode the xfer_shift to 5 (32bytes) */ 1380c1c8ff3SYoshihiro Shimoda #define USB_DMAC_XFER_SHIFT 5 1390c1c8ff3SYoshihiro Shimoda #define USB_DMAC_XFER_SIZE (1 << USB_DMAC_XFER_SHIFT) 1400c1c8ff3SYoshihiro Shimoda #define USB_DMAC_CHCR_TS USB_DMACHCR_TS_32B 1410c1c8ff3SYoshihiro Shimoda #define USB_DMAC_SLAVE_BUSWIDTH DMA_SLAVE_BUSWIDTH_32_BYTES 1420c1c8ff3SYoshihiro Shimoda 1430c1c8ff3SYoshihiro Shimoda /* for descriptors */ 1440c1c8ff3SYoshihiro Shimoda #define USB_DMAC_INITIAL_NR_DESC 16 1450c1c8ff3SYoshihiro Shimoda #define USB_DMAC_INITIAL_NR_SG 8 1460c1c8ff3SYoshihiro Shimoda 1470c1c8ff3SYoshihiro Shimoda /* ----------------------------------------------------------------------------- 1480c1c8ff3SYoshihiro Shimoda * Device access 1490c1c8ff3SYoshihiro Shimoda */ 1500c1c8ff3SYoshihiro Shimoda 1510c1c8ff3SYoshihiro Shimoda static void usb_dmac_write(struct usb_dmac *dmac, u32 reg, u32 data) 1520c1c8ff3SYoshihiro Shimoda { 1530c1c8ff3SYoshihiro Shimoda writel(data, dmac->iomem + reg); 1540c1c8ff3SYoshihiro Shimoda } 1550c1c8ff3SYoshihiro Shimoda 1560c1c8ff3SYoshihiro Shimoda static u32 usb_dmac_read(struct usb_dmac *dmac, u32 reg) 1570c1c8ff3SYoshihiro Shimoda { 1580c1c8ff3SYoshihiro Shimoda return readl(dmac->iomem + reg); 1590c1c8ff3SYoshihiro Shimoda } 1600c1c8ff3SYoshihiro Shimoda 1610c1c8ff3SYoshihiro Shimoda static u32 usb_dmac_chan_read(struct usb_dmac_chan *chan, u32 reg) 1620c1c8ff3SYoshihiro Shimoda { 1630c1c8ff3SYoshihiro Shimoda return readl(chan->iomem + reg); 1640c1c8ff3SYoshihiro Shimoda } 1650c1c8ff3SYoshihiro Shimoda 1660c1c8ff3SYoshihiro Shimoda static void usb_dmac_chan_write(struct usb_dmac_chan *chan, u32 reg, u32 data) 1670c1c8ff3SYoshihiro Shimoda { 1680c1c8ff3SYoshihiro Shimoda writel(data, chan->iomem + reg); 1690c1c8ff3SYoshihiro Shimoda } 1700c1c8ff3SYoshihiro Shimoda 1710c1c8ff3SYoshihiro Shimoda /* ----------------------------------------------------------------------------- 1720c1c8ff3SYoshihiro Shimoda * Initialization and configuration 1730c1c8ff3SYoshihiro Shimoda */ 1740c1c8ff3SYoshihiro Shimoda 1750c1c8ff3SYoshihiro Shimoda static bool usb_dmac_chan_is_busy(struct usb_dmac_chan *chan) 1760c1c8ff3SYoshihiro Shimoda { 1770c1c8ff3SYoshihiro Shimoda u32 chcr = usb_dmac_chan_read(chan, USB_DMACHCR); 1780c1c8ff3SYoshihiro Shimoda 1790c1c8ff3SYoshihiro Shimoda return (chcr & (USB_DMACHCR_DE | USB_DMACHCR_TE)) == USB_DMACHCR_DE; 1800c1c8ff3SYoshihiro Shimoda } 1810c1c8ff3SYoshihiro Shimoda 1820c1c8ff3SYoshihiro Shimoda static u32 usb_dmac_calc_tend(u32 size) 1830c1c8ff3SYoshihiro Shimoda { 1840c1c8ff3SYoshihiro Shimoda /* 1850c1c8ff3SYoshihiro Shimoda * Please refer to the Figure "Example of Final Transaction Valid 1860c1c8ff3SYoshihiro Shimoda * Data Transfer Enable (EDTEN) Setting" in the data sheet. 1870c1c8ff3SYoshihiro Shimoda */ 1880c1c8ff3SYoshihiro Shimoda return 0xffffffff << (32 - (size % USB_DMAC_XFER_SIZE ? : 1890c1c8ff3SYoshihiro Shimoda USB_DMAC_XFER_SIZE)); 1900c1c8ff3SYoshihiro Shimoda } 1910c1c8ff3SYoshihiro Shimoda 1920c1c8ff3SYoshihiro Shimoda /* This function is already held by vc.lock */ 1930c1c8ff3SYoshihiro Shimoda static void usb_dmac_chan_start_sg(struct usb_dmac_chan *chan, 1940c1c8ff3SYoshihiro Shimoda unsigned int index) 1950c1c8ff3SYoshihiro Shimoda { 1960c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc = chan->desc; 1970c1c8ff3SYoshihiro Shimoda struct usb_dmac_sg *sg = desc->sg + index; 1980c1c8ff3SYoshihiro Shimoda dma_addr_t src_addr = 0, dst_addr = 0; 1990c1c8ff3SYoshihiro Shimoda 2000c1c8ff3SYoshihiro Shimoda WARN_ON_ONCE(usb_dmac_chan_is_busy(chan)); 2010c1c8ff3SYoshihiro Shimoda 2020c1c8ff3SYoshihiro Shimoda if (desc->direction == DMA_DEV_TO_MEM) 2030c1c8ff3SYoshihiro Shimoda dst_addr = sg->mem_addr; 2040c1c8ff3SYoshihiro Shimoda else 2050c1c8ff3SYoshihiro Shimoda src_addr = sg->mem_addr; 2060c1c8ff3SYoshihiro Shimoda 2070c1c8ff3SYoshihiro Shimoda dev_dbg(chan->vc.chan.device->dev, 2080c1c8ff3SYoshihiro Shimoda "chan%u: queue sg %p: %u@%pad -> %pad\n", 2090c1c8ff3SYoshihiro Shimoda chan->index, sg, sg->size, &src_addr, &dst_addr); 2100c1c8ff3SYoshihiro Shimoda 2110c1c8ff3SYoshihiro Shimoda usb_dmac_chan_write(chan, USB_DMASAR, src_addr & 0xffffffff); 2120c1c8ff3SYoshihiro Shimoda usb_dmac_chan_write(chan, USB_DMADAR, dst_addr & 0xffffffff); 2130c1c8ff3SYoshihiro Shimoda usb_dmac_chan_write(chan, USB_DMATCR, 2140c1c8ff3SYoshihiro Shimoda DIV_ROUND_UP(sg->size, USB_DMAC_XFER_SIZE)); 2150c1c8ff3SYoshihiro Shimoda usb_dmac_chan_write(chan, USB_DMATEND, usb_dmac_calc_tend(sg->size)); 2160c1c8ff3SYoshihiro Shimoda 2170c1c8ff3SYoshihiro Shimoda usb_dmac_chan_write(chan, USB_DMACHCR, USB_DMAC_CHCR_TS | 2180c1c8ff3SYoshihiro Shimoda USB_DMACHCR_NULLE | USB_DMACHCR_IE | USB_DMACHCR_DE); 2190c1c8ff3SYoshihiro Shimoda } 2200c1c8ff3SYoshihiro Shimoda 2210c1c8ff3SYoshihiro Shimoda /* This function is already held by vc.lock */ 2220c1c8ff3SYoshihiro Shimoda static void usb_dmac_chan_start_desc(struct usb_dmac_chan *chan) 2230c1c8ff3SYoshihiro Shimoda { 2240c1c8ff3SYoshihiro Shimoda struct virt_dma_desc *vd; 2250c1c8ff3SYoshihiro Shimoda 2260c1c8ff3SYoshihiro Shimoda vd = vchan_next_desc(&chan->vc); 2270c1c8ff3SYoshihiro Shimoda if (!vd) { 2280c1c8ff3SYoshihiro Shimoda chan->desc = NULL; 2290c1c8ff3SYoshihiro Shimoda return; 2300c1c8ff3SYoshihiro Shimoda } 2310c1c8ff3SYoshihiro Shimoda 2320c1c8ff3SYoshihiro Shimoda /* 2330c1c8ff3SYoshihiro Shimoda * Remove this request from vc->desc_issued. Otherwise, this driver 2340c1c8ff3SYoshihiro Shimoda * will get the previous value from vchan_next_desc() after a transfer 2350c1c8ff3SYoshihiro Shimoda * was completed. 2360c1c8ff3SYoshihiro Shimoda */ 2370c1c8ff3SYoshihiro Shimoda list_del(&vd->node); 2380c1c8ff3SYoshihiro Shimoda 2390c1c8ff3SYoshihiro Shimoda chan->desc = to_usb_dmac_desc(vd); 2400c1c8ff3SYoshihiro Shimoda chan->desc->sg_index = 0; 2410c1c8ff3SYoshihiro Shimoda usb_dmac_chan_start_sg(chan, 0); 2420c1c8ff3SYoshihiro Shimoda } 2430c1c8ff3SYoshihiro Shimoda 2440c1c8ff3SYoshihiro Shimoda static int usb_dmac_init(struct usb_dmac *dmac) 2450c1c8ff3SYoshihiro Shimoda { 2460c1c8ff3SYoshihiro Shimoda u16 dmaor; 2470c1c8ff3SYoshihiro Shimoda 2480c1c8ff3SYoshihiro Shimoda /* Clear all channels and enable the DMAC globally. */ 2490c1c8ff3SYoshihiro Shimoda usb_dmac_write(dmac, USB_DMAOR, USB_DMAOR_DME); 2500c1c8ff3SYoshihiro Shimoda 2510c1c8ff3SYoshihiro Shimoda dmaor = usb_dmac_read(dmac, USB_DMAOR); 2520c1c8ff3SYoshihiro Shimoda if ((dmaor & (USB_DMAOR_AE | USB_DMAOR_DME)) != USB_DMAOR_DME) { 2530c1c8ff3SYoshihiro Shimoda dev_warn(dmac->dev, "DMAOR initialization failed.\n"); 2540c1c8ff3SYoshihiro Shimoda return -EIO; 2550c1c8ff3SYoshihiro Shimoda } 2560c1c8ff3SYoshihiro Shimoda 2570c1c8ff3SYoshihiro Shimoda return 0; 2580c1c8ff3SYoshihiro Shimoda } 2590c1c8ff3SYoshihiro Shimoda 2600c1c8ff3SYoshihiro Shimoda /* ----------------------------------------------------------------------------- 2610c1c8ff3SYoshihiro Shimoda * Descriptors allocation and free 2620c1c8ff3SYoshihiro Shimoda */ 2630c1c8ff3SYoshihiro Shimoda static int usb_dmac_desc_alloc(struct usb_dmac_chan *chan, unsigned int sg_len, 2640c1c8ff3SYoshihiro Shimoda gfp_t gfp) 2650c1c8ff3SYoshihiro Shimoda { 2660c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc; 2670c1c8ff3SYoshihiro Shimoda unsigned long flags; 2680c1c8ff3SYoshihiro Shimoda 269acafe7e3SKees Cook desc = kzalloc(struct_size(desc, sg, sg_len), gfp); 2700c1c8ff3SYoshihiro Shimoda if (!desc) 2710c1c8ff3SYoshihiro Shimoda return -ENOMEM; 2720c1c8ff3SYoshihiro Shimoda 2730c1c8ff3SYoshihiro Shimoda desc->sg_allocated_len = sg_len; 2740c1c8ff3SYoshihiro Shimoda INIT_LIST_HEAD(&desc->node); 2750c1c8ff3SYoshihiro Shimoda 2760c1c8ff3SYoshihiro Shimoda spin_lock_irqsave(&chan->vc.lock, flags); 2770c1c8ff3SYoshihiro Shimoda list_add_tail(&desc->node, &chan->desc_freed); 2780c1c8ff3SYoshihiro Shimoda spin_unlock_irqrestore(&chan->vc.lock, flags); 2790c1c8ff3SYoshihiro Shimoda 2800c1c8ff3SYoshihiro Shimoda return 0; 2810c1c8ff3SYoshihiro Shimoda } 2820c1c8ff3SYoshihiro Shimoda 2830c1c8ff3SYoshihiro Shimoda static void usb_dmac_desc_free(struct usb_dmac_chan *chan) 2840c1c8ff3SYoshihiro Shimoda { 285d7d8e892SYoshihiro Shimoda struct usb_dmac_desc *desc, *_desc; 2860c1c8ff3SYoshihiro Shimoda LIST_HEAD(list); 2870c1c8ff3SYoshihiro Shimoda 2880c1c8ff3SYoshihiro Shimoda list_splice_init(&chan->desc_freed, &list); 2890c1c8ff3SYoshihiro Shimoda list_splice_init(&chan->desc_got, &list); 2900c1c8ff3SYoshihiro Shimoda 291d7d8e892SYoshihiro Shimoda list_for_each_entry_safe(desc, _desc, &list, node) { 2920c1c8ff3SYoshihiro Shimoda list_del(&desc->node); 2930c1c8ff3SYoshihiro Shimoda kfree(desc); 2940c1c8ff3SYoshihiro Shimoda } 2950c1c8ff3SYoshihiro Shimoda chan->descs_allocated = 0; 2960c1c8ff3SYoshihiro Shimoda } 2970c1c8ff3SYoshihiro Shimoda 2980c1c8ff3SYoshihiro Shimoda static struct usb_dmac_desc *usb_dmac_desc_get(struct usb_dmac_chan *chan, 2990c1c8ff3SYoshihiro Shimoda unsigned int sg_len, gfp_t gfp) 3000c1c8ff3SYoshihiro Shimoda { 3010c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc = NULL; 3020c1c8ff3SYoshihiro Shimoda unsigned long flags; 3030c1c8ff3SYoshihiro Shimoda 3040c1c8ff3SYoshihiro Shimoda /* Get a freed descritpor */ 3050c1c8ff3SYoshihiro Shimoda spin_lock_irqsave(&chan->vc.lock, flags); 3060c1c8ff3SYoshihiro Shimoda list_for_each_entry(desc, &chan->desc_freed, node) { 3070c1c8ff3SYoshihiro Shimoda if (sg_len <= desc->sg_allocated_len) { 3080c1c8ff3SYoshihiro Shimoda list_move_tail(&desc->node, &chan->desc_got); 3090c1c8ff3SYoshihiro Shimoda spin_unlock_irqrestore(&chan->vc.lock, flags); 3100c1c8ff3SYoshihiro Shimoda return desc; 3110c1c8ff3SYoshihiro Shimoda } 3120c1c8ff3SYoshihiro Shimoda } 3130c1c8ff3SYoshihiro Shimoda spin_unlock_irqrestore(&chan->vc.lock, flags); 3140c1c8ff3SYoshihiro Shimoda 3150c1c8ff3SYoshihiro Shimoda /* Allocate a new descriptor */ 3160c1c8ff3SYoshihiro Shimoda if (!usb_dmac_desc_alloc(chan, sg_len, gfp)) { 3170c1c8ff3SYoshihiro Shimoda /* If allocated the desc, it was added to tail of the list */ 3180c1c8ff3SYoshihiro Shimoda spin_lock_irqsave(&chan->vc.lock, flags); 3190c1c8ff3SYoshihiro Shimoda desc = list_last_entry(&chan->desc_freed, struct usb_dmac_desc, 3200c1c8ff3SYoshihiro Shimoda node); 3210c1c8ff3SYoshihiro Shimoda list_move_tail(&desc->node, &chan->desc_got); 3220c1c8ff3SYoshihiro Shimoda spin_unlock_irqrestore(&chan->vc.lock, flags); 3230c1c8ff3SYoshihiro Shimoda return desc; 3240c1c8ff3SYoshihiro Shimoda } 3250c1c8ff3SYoshihiro Shimoda 3260c1c8ff3SYoshihiro Shimoda return NULL; 3270c1c8ff3SYoshihiro Shimoda } 3280c1c8ff3SYoshihiro Shimoda 3290c1c8ff3SYoshihiro Shimoda static void usb_dmac_desc_put(struct usb_dmac_chan *chan, 3300c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc) 3310c1c8ff3SYoshihiro Shimoda { 3320c1c8ff3SYoshihiro Shimoda unsigned long flags; 3330c1c8ff3SYoshihiro Shimoda 3340c1c8ff3SYoshihiro Shimoda spin_lock_irqsave(&chan->vc.lock, flags); 3350c1c8ff3SYoshihiro Shimoda list_move_tail(&desc->node, &chan->desc_freed); 3360c1c8ff3SYoshihiro Shimoda spin_unlock_irqrestore(&chan->vc.lock, flags); 3370c1c8ff3SYoshihiro Shimoda } 3380c1c8ff3SYoshihiro Shimoda 3390c1c8ff3SYoshihiro Shimoda /* ----------------------------------------------------------------------------- 3400c1c8ff3SYoshihiro Shimoda * Stop and reset 3410c1c8ff3SYoshihiro Shimoda */ 3420c1c8ff3SYoshihiro Shimoda 3430c1c8ff3SYoshihiro Shimoda static void usb_dmac_soft_reset(struct usb_dmac_chan *uchan) 3440c1c8ff3SYoshihiro Shimoda { 3450c1c8ff3SYoshihiro Shimoda struct dma_chan *chan = &uchan->vc.chan; 3460c1c8ff3SYoshihiro Shimoda struct usb_dmac *dmac = to_usb_dmac(chan->device); 3470c1c8ff3SYoshihiro Shimoda int i; 3480c1c8ff3SYoshihiro Shimoda 3490c1c8ff3SYoshihiro Shimoda /* Don't issue soft reset if any one of channels is busy */ 3500c1c8ff3SYoshihiro Shimoda for (i = 0; i < dmac->n_channels; ++i) { 3510c1c8ff3SYoshihiro Shimoda if (usb_dmac_chan_is_busy(uchan)) 3520c1c8ff3SYoshihiro Shimoda return; 3530c1c8ff3SYoshihiro Shimoda } 3540c1c8ff3SYoshihiro Shimoda 3550c1c8ff3SYoshihiro Shimoda usb_dmac_write(dmac, USB_DMAOR, 0); 3560c1c8ff3SYoshihiro Shimoda usb_dmac_write(dmac, USB_DMASWR, USB_DMASWR_SWR); 3570c1c8ff3SYoshihiro Shimoda udelay(100); 3580c1c8ff3SYoshihiro Shimoda usb_dmac_write(dmac, USB_DMASWR, 0); 3590c1c8ff3SYoshihiro Shimoda usb_dmac_write(dmac, USB_DMAOR, 1); 3600c1c8ff3SYoshihiro Shimoda } 3610c1c8ff3SYoshihiro Shimoda 3620c1c8ff3SYoshihiro Shimoda static void usb_dmac_chan_halt(struct usb_dmac_chan *chan) 3630c1c8ff3SYoshihiro Shimoda { 3640c1c8ff3SYoshihiro Shimoda u32 chcr = usb_dmac_chan_read(chan, USB_DMACHCR); 3650c1c8ff3SYoshihiro Shimoda 3660c1c8ff3SYoshihiro Shimoda chcr &= ~(USB_DMACHCR_IE | USB_DMACHCR_TE | USB_DMACHCR_DE); 3670c1c8ff3SYoshihiro Shimoda usb_dmac_chan_write(chan, USB_DMACHCR, chcr); 3680c1c8ff3SYoshihiro Shimoda 3690c1c8ff3SYoshihiro Shimoda usb_dmac_soft_reset(chan); 3700c1c8ff3SYoshihiro Shimoda } 3710c1c8ff3SYoshihiro Shimoda 3720c1c8ff3SYoshihiro Shimoda static void usb_dmac_stop(struct usb_dmac *dmac) 3730c1c8ff3SYoshihiro Shimoda { 3740c1c8ff3SYoshihiro Shimoda usb_dmac_write(dmac, USB_DMAOR, 0); 3750c1c8ff3SYoshihiro Shimoda } 3760c1c8ff3SYoshihiro Shimoda 3770c1c8ff3SYoshihiro Shimoda /* ----------------------------------------------------------------------------- 3780c1c8ff3SYoshihiro Shimoda * DMA engine operations 3790c1c8ff3SYoshihiro Shimoda */ 3800c1c8ff3SYoshihiro Shimoda 3810c1c8ff3SYoshihiro Shimoda static int usb_dmac_alloc_chan_resources(struct dma_chan *chan) 3820c1c8ff3SYoshihiro Shimoda { 3830c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); 3840c1c8ff3SYoshihiro Shimoda int ret; 3850c1c8ff3SYoshihiro Shimoda 3860c1c8ff3SYoshihiro Shimoda while (uchan->descs_allocated < USB_DMAC_INITIAL_NR_DESC) { 3870c1c8ff3SYoshihiro Shimoda ret = usb_dmac_desc_alloc(uchan, USB_DMAC_INITIAL_NR_SG, 3880c1c8ff3SYoshihiro Shimoda GFP_KERNEL); 3890c1c8ff3SYoshihiro Shimoda if (ret < 0) { 3900c1c8ff3SYoshihiro Shimoda usb_dmac_desc_free(uchan); 3910c1c8ff3SYoshihiro Shimoda return ret; 3920c1c8ff3SYoshihiro Shimoda } 3930c1c8ff3SYoshihiro Shimoda uchan->descs_allocated++; 3940c1c8ff3SYoshihiro Shimoda } 3950c1c8ff3SYoshihiro Shimoda 3960c1c8ff3SYoshihiro Shimoda return pm_runtime_get_sync(chan->device->dev); 3970c1c8ff3SYoshihiro Shimoda } 3980c1c8ff3SYoshihiro Shimoda 3990c1c8ff3SYoshihiro Shimoda static void usb_dmac_free_chan_resources(struct dma_chan *chan) 4000c1c8ff3SYoshihiro Shimoda { 4010c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); 4020c1c8ff3SYoshihiro Shimoda unsigned long flags; 4030c1c8ff3SYoshihiro Shimoda 4040c1c8ff3SYoshihiro Shimoda /* Protect against ISR */ 4050c1c8ff3SYoshihiro Shimoda spin_lock_irqsave(&uchan->vc.lock, flags); 4060c1c8ff3SYoshihiro Shimoda usb_dmac_chan_halt(uchan); 4070c1c8ff3SYoshihiro Shimoda spin_unlock_irqrestore(&uchan->vc.lock, flags); 4080c1c8ff3SYoshihiro Shimoda 4090c1c8ff3SYoshihiro Shimoda usb_dmac_desc_free(uchan); 4100c1c8ff3SYoshihiro Shimoda vchan_free_chan_resources(&uchan->vc); 4110c1c8ff3SYoshihiro Shimoda 4120c1c8ff3SYoshihiro Shimoda pm_runtime_put(chan->device->dev); 4130c1c8ff3SYoshihiro Shimoda } 4140c1c8ff3SYoshihiro Shimoda 4150c1c8ff3SYoshihiro Shimoda static struct dma_async_tx_descriptor * 4160c1c8ff3SYoshihiro Shimoda usb_dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, 4170c1c8ff3SYoshihiro Shimoda unsigned int sg_len, enum dma_transfer_direction dir, 4180c1c8ff3SYoshihiro Shimoda unsigned long dma_flags, void *context) 4190c1c8ff3SYoshihiro Shimoda { 4200c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); 4210c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc; 4220c1c8ff3SYoshihiro Shimoda struct scatterlist *sg; 4230c1c8ff3SYoshihiro Shimoda int i; 4240c1c8ff3SYoshihiro Shimoda 4250c1c8ff3SYoshihiro Shimoda if (!sg_len) { 4260c1c8ff3SYoshihiro Shimoda dev_warn(chan->device->dev, 4270c1c8ff3SYoshihiro Shimoda "%s: bad parameter: len=%d\n", __func__, sg_len); 4280c1c8ff3SYoshihiro Shimoda return NULL; 4290c1c8ff3SYoshihiro Shimoda } 4300c1c8ff3SYoshihiro Shimoda 4310c1c8ff3SYoshihiro Shimoda desc = usb_dmac_desc_get(uchan, sg_len, GFP_NOWAIT); 4320c1c8ff3SYoshihiro Shimoda if (!desc) 4330c1c8ff3SYoshihiro Shimoda return NULL; 4340c1c8ff3SYoshihiro Shimoda 4350c1c8ff3SYoshihiro Shimoda desc->direction = dir; 4360c1c8ff3SYoshihiro Shimoda desc->sg_len = sg_len; 4370c1c8ff3SYoshihiro Shimoda for_each_sg(sgl, sg, sg_len, i) { 4380c1c8ff3SYoshihiro Shimoda desc->sg[i].mem_addr = sg_dma_address(sg); 4390c1c8ff3SYoshihiro Shimoda desc->sg[i].size = sg_dma_len(sg); 4400c1c8ff3SYoshihiro Shimoda } 4410c1c8ff3SYoshihiro Shimoda 4420c1c8ff3SYoshihiro Shimoda return vchan_tx_prep(&uchan->vc, &desc->vd, dma_flags); 4430c1c8ff3SYoshihiro Shimoda } 4440c1c8ff3SYoshihiro Shimoda 4450c1c8ff3SYoshihiro Shimoda static int usb_dmac_chan_terminate_all(struct dma_chan *chan) 4460c1c8ff3SYoshihiro Shimoda { 4470c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); 448d9f5efadSYoshihiro Shimoda struct usb_dmac_desc *desc, *_desc; 4490c1c8ff3SYoshihiro Shimoda unsigned long flags; 4500c1c8ff3SYoshihiro Shimoda LIST_HEAD(head); 4510c1c8ff3SYoshihiro Shimoda LIST_HEAD(list); 4520c1c8ff3SYoshihiro Shimoda 4530c1c8ff3SYoshihiro Shimoda spin_lock_irqsave(&uchan->vc.lock, flags); 4540c1c8ff3SYoshihiro Shimoda usb_dmac_chan_halt(uchan); 4550c1c8ff3SYoshihiro Shimoda vchan_get_all_descriptors(&uchan->vc, &head); 4560c1c8ff3SYoshihiro Shimoda if (uchan->desc) 4570c1c8ff3SYoshihiro Shimoda uchan->desc = NULL; 4580c1c8ff3SYoshihiro Shimoda list_splice_init(&uchan->desc_got, &list); 459d9f5efadSYoshihiro Shimoda list_for_each_entry_safe(desc, _desc, &list, node) 4600c1c8ff3SYoshihiro Shimoda list_move_tail(&desc->node, &uchan->desc_freed); 4610c1c8ff3SYoshihiro Shimoda spin_unlock_irqrestore(&uchan->vc.lock, flags); 4620c1c8ff3SYoshihiro Shimoda vchan_dma_desc_free_list(&uchan->vc, &head); 4630c1c8ff3SYoshihiro Shimoda 4640c1c8ff3SYoshihiro Shimoda return 0; 4650c1c8ff3SYoshihiro Shimoda } 4660c1c8ff3SYoshihiro Shimoda 4670c1c8ff3SYoshihiro Shimoda static unsigned int usb_dmac_get_current_residue(struct usb_dmac_chan *chan, 4680c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc, 4690c1c8ff3SYoshihiro Shimoda int sg_index) 4700c1c8ff3SYoshihiro Shimoda { 4710c1c8ff3SYoshihiro Shimoda struct usb_dmac_sg *sg = desc->sg + sg_index; 4720c1c8ff3SYoshihiro Shimoda u32 mem_addr = sg->mem_addr & 0xffffffff; 4730c1c8ff3SYoshihiro Shimoda unsigned int residue = sg->size; 4740c1c8ff3SYoshihiro Shimoda 4750c1c8ff3SYoshihiro Shimoda /* 4760c1c8ff3SYoshihiro Shimoda * We cannot use USB_DMATCR to calculate residue because USB_DMATCR 4770c1c8ff3SYoshihiro Shimoda * has unsuited value to calculate. 4780c1c8ff3SYoshihiro Shimoda */ 4790c1c8ff3SYoshihiro Shimoda if (desc->direction == DMA_DEV_TO_MEM) 4800c1c8ff3SYoshihiro Shimoda residue -= usb_dmac_chan_read(chan, USB_DMADAR) - mem_addr; 4810c1c8ff3SYoshihiro Shimoda else 4820c1c8ff3SYoshihiro Shimoda residue -= usb_dmac_chan_read(chan, USB_DMASAR) - mem_addr; 4830c1c8ff3SYoshihiro Shimoda 4840c1c8ff3SYoshihiro Shimoda return residue; 4850c1c8ff3SYoshihiro Shimoda } 4860c1c8ff3SYoshihiro Shimoda 4870c1c8ff3SYoshihiro Shimoda static u32 usb_dmac_chan_get_residue_if_complete(struct usb_dmac_chan *chan, 4880c1c8ff3SYoshihiro Shimoda dma_cookie_t cookie) 4890c1c8ff3SYoshihiro Shimoda { 4900c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc; 4910c1c8ff3SYoshihiro Shimoda u32 residue = 0; 4920c1c8ff3SYoshihiro Shimoda 4930c1c8ff3SYoshihiro Shimoda list_for_each_entry_reverse(desc, &chan->desc_freed, node) { 4940c1c8ff3SYoshihiro Shimoda if (desc->done_cookie == cookie) { 4950c1c8ff3SYoshihiro Shimoda residue = desc->residue; 4960c1c8ff3SYoshihiro Shimoda break; 4970c1c8ff3SYoshihiro Shimoda } 4980c1c8ff3SYoshihiro Shimoda } 4990c1c8ff3SYoshihiro Shimoda 5000c1c8ff3SYoshihiro Shimoda return residue; 5010c1c8ff3SYoshihiro Shimoda } 5020c1c8ff3SYoshihiro Shimoda 5030c1c8ff3SYoshihiro Shimoda static u32 usb_dmac_chan_get_residue(struct usb_dmac_chan *chan, 5040c1c8ff3SYoshihiro Shimoda dma_cookie_t cookie) 5050c1c8ff3SYoshihiro Shimoda { 5060c1c8ff3SYoshihiro Shimoda u32 residue = 0; 5070c1c8ff3SYoshihiro Shimoda struct virt_dma_desc *vd; 5080c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc = chan->desc; 5090c1c8ff3SYoshihiro Shimoda int i; 5100c1c8ff3SYoshihiro Shimoda 5110c1c8ff3SYoshihiro Shimoda if (!desc) { 5120c1c8ff3SYoshihiro Shimoda vd = vchan_find_desc(&chan->vc, cookie); 5130c1c8ff3SYoshihiro Shimoda if (!vd) 5140c1c8ff3SYoshihiro Shimoda return 0; 5150c1c8ff3SYoshihiro Shimoda desc = to_usb_dmac_desc(vd); 5160c1c8ff3SYoshihiro Shimoda } 5170c1c8ff3SYoshihiro Shimoda 5180c1c8ff3SYoshihiro Shimoda /* Compute the size of all usb_dmac_sg still to be transferred */ 5190c1c8ff3SYoshihiro Shimoda for (i = desc->sg_index + 1; i < desc->sg_len; i++) 5200c1c8ff3SYoshihiro Shimoda residue += desc->sg[i].size; 5210c1c8ff3SYoshihiro Shimoda 5220c1c8ff3SYoshihiro Shimoda /* Add the residue for the current sg */ 5230c1c8ff3SYoshihiro Shimoda residue += usb_dmac_get_current_residue(chan, desc, desc->sg_index); 5240c1c8ff3SYoshihiro Shimoda 5250c1c8ff3SYoshihiro Shimoda return residue; 5260c1c8ff3SYoshihiro Shimoda } 5270c1c8ff3SYoshihiro Shimoda 5280c1c8ff3SYoshihiro Shimoda static enum dma_status usb_dmac_tx_status(struct dma_chan *chan, 5290c1c8ff3SYoshihiro Shimoda dma_cookie_t cookie, 5300c1c8ff3SYoshihiro Shimoda struct dma_tx_state *txstate) 5310c1c8ff3SYoshihiro Shimoda { 5320c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); 5330c1c8ff3SYoshihiro Shimoda enum dma_status status; 5340c1c8ff3SYoshihiro Shimoda unsigned int residue = 0; 5350c1c8ff3SYoshihiro Shimoda unsigned long flags; 5360c1c8ff3SYoshihiro Shimoda 5370c1c8ff3SYoshihiro Shimoda status = dma_cookie_status(chan, cookie, txstate); 5380c1c8ff3SYoshihiro Shimoda /* a client driver will get residue after DMA_COMPLETE */ 5390c1c8ff3SYoshihiro Shimoda if (!txstate) 5400c1c8ff3SYoshihiro Shimoda return status; 5410c1c8ff3SYoshihiro Shimoda 5420c1c8ff3SYoshihiro Shimoda spin_lock_irqsave(&uchan->vc.lock, flags); 5430c1c8ff3SYoshihiro Shimoda if (status == DMA_COMPLETE) 5440c1c8ff3SYoshihiro Shimoda residue = usb_dmac_chan_get_residue_if_complete(uchan, cookie); 5450c1c8ff3SYoshihiro Shimoda else 5460c1c8ff3SYoshihiro Shimoda residue = usb_dmac_chan_get_residue(uchan, cookie); 5470c1c8ff3SYoshihiro Shimoda spin_unlock_irqrestore(&uchan->vc.lock, flags); 5480c1c8ff3SYoshihiro Shimoda 5490c1c8ff3SYoshihiro Shimoda dma_set_residue(txstate, residue); 5500c1c8ff3SYoshihiro Shimoda 5510c1c8ff3SYoshihiro Shimoda return status; 5520c1c8ff3SYoshihiro Shimoda } 5530c1c8ff3SYoshihiro Shimoda 5540c1c8ff3SYoshihiro Shimoda static void usb_dmac_issue_pending(struct dma_chan *chan) 5550c1c8ff3SYoshihiro Shimoda { 5560c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); 5570c1c8ff3SYoshihiro Shimoda unsigned long flags; 5580c1c8ff3SYoshihiro Shimoda 5590c1c8ff3SYoshihiro Shimoda spin_lock_irqsave(&uchan->vc.lock, flags); 5600c1c8ff3SYoshihiro Shimoda if (vchan_issue_pending(&uchan->vc) && !uchan->desc) 5610c1c8ff3SYoshihiro Shimoda usb_dmac_chan_start_desc(uchan); 5620c1c8ff3SYoshihiro Shimoda spin_unlock_irqrestore(&uchan->vc.lock, flags); 5630c1c8ff3SYoshihiro Shimoda } 5640c1c8ff3SYoshihiro Shimoda 5650c1c8ff3SYoshihiro Shimoda static void usb_dmac_virt_desc_free(struct virt_dma_desc *vd) 5660c1c8ff3SYoshihiro Shimoda { 5670c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc = to_usb_dmac_desc(vd); 5680c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *chan = to_usb_dmac_chan(vd->tx.chan); 5690c1c8ff3SYoshihiro Shimoda 5700c1c8ff3SYoshihiro Shimoda usb_dmac_desc_put(chan, desc); 5710c1c8ff3SYoshihiro Shimoda } 5720c1c8ff3SYoshihiro Shimoda 5730c1c8ff3SYoshihiro Shimoda /* ----------------------------------------------------------------------------- 5740c1c8ff3SYoshihiro Shimoda * IRQ handling 5750c1c8ff3SYoshihiro Shimoda */ 5760c1c8ff3SYoshihiro Shimoda 5770c1c8ff3SYoshihiro Shimoda static void usb_dmac_isr_transfer_end(struct usb_dmac_chan *chan) 5780c1c8ff3SYoshihiro Shimoda { 5790c1c8ff3SYoshihiro Shimoda struct usb_dmac_desc *desc = chan->desc; 5800c1c8ff3SYoshihiro Shimoda 5810c1c8ff3SYoshihiro Shimoda BUG_ON(!desc); 5820c1c8ff3SYoshihiro Shimoda 5830c1c8ff3SYoshihiro Shimoda if (++desc->sg_index < desc->sg_len) { 5840c1c8ff3SYoshihiro Shimoda usb_dmac_chan_start_sg(chan, desc->sg_index); 5850c1c8ff3SYoshihiro Shimoda } else { 5860c1c8ff3SYoshihiro Shimoda desc->residue = usb_dmac_get_current_residue(chan, desc, 5870c1c8ff3SYoshihiro Shimoda desc->sg_index - 1); 5880c1c8ff3SYoshihiro Shimoda desc->done_cookie = desc->vd.tx.cookie; 5890c1c8ff3SYoshihiro Shimoda vchan_cookie_complete(&desc->vd); 5900c1c8ff3SYoshihiro Shimoda 5910c1c8ff3SYoshihiro Shimoda /* Restart the next transfer if this driver has a next desc */ 5920c1c8ff3SYoshihiro Shimoda usb_dmac_chan_start_desc(chan); 5930c1c8ff3SYoshihiro Shimoda } 5940c1c8ff3SYoshihiro Shimoda } 5950c1c8ff3SYoshihiro Shimoda 5960c1c8ff3SYoshihiro Shimoda static irqreturn_t usb_dmac_isr_channel(int irq, void *dev) 5970c1c8ff3SYoshihiro Shimoda { 5980c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *chan = dev; 5990c1c8ff3SYoshihiro Shimoda irqreturn_t ret = IRQ_NONE; 600626d2f07SYoshihiro Shimoda u32 mask = 0; 6010c1c8ff3SYoshihiro Shimoda u32 chcr; 602626d2f07SYoshihiro Shimoda bool xfer_end = false; 6030c1c8ff3SYoshihiro Shimoda 6040c1c8ff3SYoshihiro Shimoda spin_lock(&chan->vc.lock); 6050c1c8ff3SYoshihiro Shimoda 6060c1c8ff3SYoshihiro Shimoda chcr = usb_dmac_chan_read(chan, USB_DMACHCR); 607626d2f07SYoshihiro Shimoda if (chcr & (USB_DMACHCR_TE | USB_DMACHCR_SP)) { 608626d2f07SYoshihiro Shimoda mask |= USB_DMACHCR_DE | USB_DMACHCR_TE | USB_DMACHCR_SP; 609626d2f07SYoshihiro Shimoda if (chcr & USB_DMACHCR_DE) 610626d2f07SYoshihiro Shimoda xfer_end = true; 611626d2f07SYoshihiro Shimoda ret |= IRQ_HANDLED; 612626d2f07SYoshihiro Shimoda } 6130c1c8ff3SYoshihiro Shimoda if (chcr & USB_DMACHCR_NULL) { 6140c1c8ff3SYoshihiro Shimoda /* An interruption of TE will happen after we set FTE */ 6150c1c8ff3SYoshihiro Shimoda mask |= USB_DMACHCR_NULL; 6160c1c8ff3SYoshihiro Shimoda chcr |= USB_DMACHCR_FTE; 6170c1c8ff3SYoshihiro Shimoda ret |= IRQ_HANDLED; 6180c1c8ff3SYoshihiro Shimoda } 619626d2f07SYoshihiro Shimoda if (mask) 6200c1c8ff3SYoshihiro Shimoda usb_dmac_chan_write(chan, USB_DMACHCR, chcr & ~mask); 6210c1c8ff3SYoshihiro Shimoda 622626d2f07SYoshihiro Shimoda if (xfer_end) 6230c1c8ff3SYoshihiro Shimoda usb_dmac_isr_transfer_end(chan); 6240c1c8ff3SYoshihiro Shimoda 6250c1c8ff3SYoshihiro Shimoda spin_unlock(&chan->vc.lock); 6260c1c8ff3SYoshihiro Shimoda 6270c1c8ff3SYoshihiro Shimoda return ret; 6280c1c8ff3SYoshihiro Shimoda } 6290c1c8ff3SYoshihiro Shimoda 6300c1c8ff3SYoshihiro Shimoda /* ----------------------------------------------------------------------------- 6310c1c8ff3SYoshihiro Shimoda * OF xlate and channel filter 6320c1c8ff3SYoshihiro Shimoda */ 6330c1c8ff3SYoshihiro Shimoda 6340c1c8ff3SYoshihiro Shimoda static bool usb_dmac_chan_filter(struct dma_chan *chan, void *arg) 6350c1c8ff3SYoshihiro Shimoda { 6360c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); 6370c1c8ff3SYoshihiro Shimoda struct of_phandle_args *dma_spec = arg; 6380c1c8ff3SYoshihiro Shimoda 6390c1c8ff3SYoshihiro Shimoda if (dma_spec->np != chan->device->dev->of_node) 6400c1c8ff3SYoshihiro Shimoda return false; 6410c1c8ff3SYoshihiro Shimoda 6420c1c8ff3SYoshihiro Shimoda /* USB-DMAC should be used with fixed usb controller's FIFO */ 6430c1c8ff3SYoshihiro Shimoda if (uchan->index != dma_spec->args[0]) 6440c1c8ff3SYoshihiro Shimoda return false; 6450c1c8ff3SYoshihiro Shimoda 6460c1c8ff3SYoshihiro Shimoda return true; 6470c1c8ff3SYoshihiro Shimoda } 6480c1c8ff3SYoshihiro Shimoda 6490c1c8ff3SYoshihiro Shimoda static struct dma_chan *usb_dmac_of_xlate(struct of_phandle_args *dma_spec, 6500c1c8ff3SYoshihiro Shimoda struct of_dma *ofdma) 6510c1c8ff3SYoshihiro Shimoda { 6520c1c8ff3SYoshihiro Shimoda struct dma_chan *chan; 6530c1c8ff3SYoshihiro Shimoda dma_cap_mask_t mask; 6540c1c8ff3SYoshihiro Shimoda 6550c1c8ff3SYoshihiro Shimoda if (dma_spec->args_count != 1) 6560c1c8ff3SYoshihiro Shimoda return NULL; 6570c1c8ff3SYoshihiro Shimoda 6580c1c8ff3SYoshihiro Shimoda /* Only slave DMA channels can be allocated via DT */ 6590c1c8ff3SYoshihiro Shimoda dma_cap_zero(mask); 6600c1c8ff3SYoshihiro Shimoda dma_cap_set(DMA_SLAVE, mask); 6610c1c8ff3SYoshihiro Shimoda 6620c1c8ff3SYoshihiro Shimoda chan = dma_request_channel(mask, usb_dmac_chan_filter, dma_spec); 6630c1c8ff3SYoshihiro Shimoda if (!chan) 6640c1c8ff3SYoshihiro Shimoda return NULL; 6650c1c8ff3SYoshihiro Shimoda 6660c1c8ff3SYoshihiro Shimoda return chan; 6670c1c8ff3SYoshihiro Shimoda } 6680c1c8ff3SYoshihiro Shimoda 6690c1c8ff3SYoshihiro Shimoda /* ----------------------------------------------------------------------------- 6700c1c8ff3SYoshihiro Shimoda * Power management 6710c1c8ff3SYoshihiro Shimoda */ 6720c1c8ff3SYoshihiro Shimoda 6738ad31bf4SGeert Uytterhoeven #ifdef CONFIG_PM 6740c1c8ff3SYoshihiro Shimoda static int usb_dmac_runtime_suspend(struct device *dev) 6750c1c8ff3SYoshihiro Shimoda { 6760c1c8ff3SYoshihiro Shimoda struct usb_dmac *dmac = dev_get_drvdata(dev); 6770c1c8ff3SYoshihiro Shimoda int i; 6780c1c8ff3SYoshihiro Shimoda 67936fa4a53SGeert Uytterhoeven for (i = 0; i < dmac->n_channels; ++i) { 68036fa4a53SGeert Uytterhoeven if (!dmac->channels[i].iomem) 68136fa4a53SGeert Uytterhoeven break; 6820c1c8ff3SYoshihiro Shimoda usb_dmac_chan_halt(&dmac->channels[i]); 68336fa4a53SGeert Uytterhoeven } 6840c1c8ff3SYoshihiro Shimoda 6850c1c8ff3SYoshihiro Shimoda return 0; 6860c1c8ff3SYoshihiro Shimoda } 6870c1c8ff3SYoshihiro Shimoda 6880c1c8ff3SYoshihiro Shimoda static int usb_dmac_runtime_resume(struct device *dev) 6890c1c8ff3SYoshihiro Shimoda { 6900c1c8ff3SYoshihiro Shimoda struct usb_dmac *dmac = dev_get_drvdata(dev); 6910c1c8ff3SYoshihiro Shimoda 6920c1c8ff3SYoshihiro Shimoda return usb_dmac_init(dmac); 6930c1c8ff3SYoshihiro Shimoda } 6948ad31bf4SGeert Uytterhoeven #endif /* CONFIG_PM */ 6950c1c8ff3SYoshihiro Shimoda 6960c1c8ff3SYoshihiro Shimoda static const struct dev_pm_ops usb_dmac_pm = { 6970c1c8ff3SYoshihiro Shimoda SET_RUNTIME_PM_OPS(usb_dmac_runtime_suspend, usb_dmac_runtime_resume, 6980c1c8ff3SYoshihiro Shimoda NULL) 6990c1c8ff3SYoshihiro Shimoda }; 7000c1c8ff3SYoshihiro Shimoda 7010c1c8ff3SYoshihiro Shimoda /* ----------------------------------------------------------------------------- 7020c1c8ff3SYoshihiro Shimoda * Probe and remove 7030c1c8ff3SYoshihiro Shimoda */ 7040c1c8ff3SYoshihiro Shimoda 7050c1c8ff3SYoshihiro Shimoda static int usb_dmac_chan_probe(struct usb_dmac *dmac, 7060c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *uchan, 7070c1c8ff3SYoshihiro Shimoda unsigned int index) 7080c1c8ff3SYoshihiro Shimoda { 7090c1c8ff3SYoshihiro Shimoda struct platform_device *pdev = to_platform_device(dmac->dev); 7100c1c8ff3SYoshihiro Shimoda char pdev_irqname[5]; 7110c1c8ff3SYoshihiro Shimoda char *irqname; 7120c1c8ff3SYoshihiro Shimoda int ret; 7130c1c8ff3SYoshihiro Shimoda 7140c1c8ff3SYoshihiro Shimoda uchan->index = index; 7150c1c8ff3SYoshihiro Shimoda uchan->iomem = dmac->iomem + USB_DMAC_CHAN_OFFSET(index); 7160c1c8ff3SYoshihiro Shimoda 7170c1c8ff3SYoshihiro Shimoda /* Request the channel interrupt. */ 7180c1c8ff3SYoshihiro Shimoda sprintf(pdev_irqname, "ch%u", index); 7190c1c8ff3SYoshihiro Shimoda uchan->irq = platform_get_irq_byname(pdev, pdev_irqname); 7200c1c8ff3SYoshihiro Shimoda if (uchan->irq < 0) { 7210c1c8ff3SYoshihiro Shimoda dev_err(dmac->dev, "no IRQ specified for channel %u\n", index); 7220c1c8ff3SYoshihiro Shimoda return -ENODEV; 7230c1c8ff3SYoshihiro Shimoda } 7240c1c8ff3SYoshihiro Shimoda 7250c1c8ff3SYoshihiro Shimoda irqname = devm_kasprintf(dmac->dev, GFP_KERNEL, "%s:%u", 7260c1c8ff3SYoshihiro Shimoda dev_name(dmac->dev), index); 7270c1c8ff3SYoshihiro Shimoda if (!irqname) 7280c1c8ff3SYoshihiro Shimoda return -ENOMEM; 7290c1c8ff3SYoshihiro Shimoda 7300c1c8ff3SYoshihiro Shimoda ret = devm_request_irq(dmac->dev, uchan->irq, usb_dmac_isr_channel, 7310c1c8ff3SYoshihiro Shimoda IRQF_SHARED, irqname, uchan); 7320c1c8ff3SYoshihiro Shimoda if (ret) { 7330c1c8ff3SYoshihiro Shimoda dev_err(dmac->dev, "failed to request IRQ %u (%d)\n", 7340c1c8ff3SYoshihiro Shimoda uchan->irq, ret); 7350c1c8ff3SYoshihiro Shimoda return ret; 7360c1c8ff3SYoshihiro Shimoda } 7370c1c8ff3SYoshihiro Shimoda 7380c1c8ff3SYoshihiro Shimoda uchan->vc.desc_free = usb_dmac_virt_desc_free; 7390c1c8ff3SYoshihiro Shimoda vchan_init(&uchan->vc, &dmac->engine); 7400c1c8ff3SYoshihiro Shimoda INIT_LIST_HEAD(&uchan->desc_freed); 7410c1c8ff3SYoshihiro Shimoda INIT_LIST_HEAD(&uchan->desc_got); 7420c1c8ff3SYoshihiro Shimoda 7430c1c8ff3SYoshihiro Shimoda return 0; 7440c1c8ff3SYoshihiro Shimoda } 7450c1c8ff3SYoshihiro Shimoda 7460c1c8ff3SYoshihiro Shimoda static int usb_dmac_parse_of(struct device *dev, struct usb_dmac *dmac) 7470c1c8ff3SYoshihiro Shimoda { 7480c1c8ff3SYoshihiro Shimoda struct device_node *np = dev->of_node; 7490c1c8ff3SYoshihiro Shimoda int ret; 7500c1c8ff3SYoshihiro Shimoda 7510c1c8ff3SYoshihiro Shimoda ret = of_property_read_u32(np, "dma-channels", &dmac->n_channels); 7520c1c8ff3SYoshihiro Shimoda if (ret < 0) { 7530c1c8ff3SYoshihiro Shimoda dev_err(dev, "unable to read dma-channels property\n"); 7540c1c8ff3SYoshihiro Shimoda return ret; 7550c1c8ff3SYoshihiro Shimoda } 7560c1c8ff3SYoshihiro Shimoda 7570c1c8ff3SYoshihiro Shimoda if (dmac->n_channels <= 0 || dmac->n_channels >= 100) { 7580c1c8ff3SYoshihiro Shimoda dev_err(dev, "invalid number of channels %u\n", 7590c1c8ff3SYoshihiro Shimoda dmac->n_channels); 7600c1c8ff3SYoshihiro Shimoda return -EINVAL; 7610c1c8ff3SYoshihiro Shimoda } 7620c1c8ff3SYoshihiro Shimoda 7630c1c8ff3SYoshihiro Shimoda return 0; 7640c1c8ff3SYoshihiro Shimoda } 7650c1c8ff3SYoshihiro Shimoda 7660c1c8ff3SYoshihiro Shimoda static int usb_dmac_probe(struct platform_device *pdev) 7670c1c8ff3SYoshihiro Shimoda { 7680c1c8ff3SYoshihiro Shimoda const enum dma_slave_buswidth widths = USB_DMAC_SLAVE_BUSWIDTH; 7690c1c8ff3SYoshihiro Shimoda struct dma_device *engine; 7700c1c8ff3SYoshihiro Shimoda struct usb_dmac *dmac; 7710c1c8ff3SYoshihiro Shimoda struct resource *mem; 7720c1c8ff3SYoshihiro Shimoda unsigned int i; 7730c1c8ff3SYoshihiro Shimoda int ret; 7740c1c8ff3SYoshihiro Shimoda 7750c1c8ff3SYoshihiro Shimoda dmac = devm_kzalloc(&pdev->dev, sizeof(*dmac), GFP_KERNEL); 7760c1c8ff3SYoshihiro Shimoda if (!dmac) 7770c1c8ff3SYoshihiro Shimoda return -ENOMEM; 7780c1c8ff3SYoshihiro Shimoda 7790c1c8ff3SYoshihiro Shimoda dmac->dev = &pdev->dev; 7800c1c8ff3SYoshihiro Shimoda platform_set_drvdata(pdev, dmac); 7810c1c8ff3SYoshihiro Shimoda 7820c1c8ff3SYoshihiro Shimoda ret = usb_dmac_parse_of(&pdev->dev, dmac); 7830c1c8ff3SYoshihiro Shimoda if (ret < 0) 7840c1c8ff3SYoshihiro Shimoda return ret; 7850c1c8ff3SYoshihiro Shimoda 7860c1c8ff3SYoshihiro Shimoda dmac->channels = devm_kcalloc(&pdev->dev, dmac->n_channels, 7870c1c8ff3SYoshihiro Shimoda sizeof(*dmac->channels), GFP_KERNEL); 7880c1c8ff3SYoshihiro Shimoda if (!dmac->channels) 7890c1c8ff3SYoshihiro Shimoda return -ENOMEM; 7900c1c8ff3SYoshihiro Shimoda 7910c1c8ff3SYoshihiro Shimoda /* Request resources. */ 7920c1c8ff3SYoshihiro Shimoda mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 7930c1c8ff3SYoshihiro Shimoda dmac->iomem = devm_ioremap_resource(&pdev->dev, mem); 7940c1c8ff3SYoshihiro Shimoda if (IS_ERR(dmac->iomem)) 7950c1c8ff3SYoshihiro Shimoda return PTR_ERR(dmac->iomem); 7960c1c8ff3SYoshihiro Shimoda 7970c1c8ff3SYoshihiro Shimoda /* Enable runtime PM and initialize the device. */ 7980c1c8ff3SYoshihiro Shimoda pm_runtime_enable(&pdev->dev); 7990c1c8ff3SYoshihiro Shimoda ret = pm_runtime_get_sync(&pdev->dev); 8000c1c8ff3SYoshihiro Shimoda if (ret < 0) { 8010c1c8ff3SYoshihiro Shimoda dev_err(&pdev->dev, "runtime PM get sync failed (%d)\n", ret); 802bf55555bSGeert Uytterhoeven goto error_pm; 8030c1c8ff3SYoshihiro Shimoda } 8040c1c8ff3SYoshihiro Shimoda 8050c1c8ff3SYoshihiro Shimoda ret = usb_dmac_init(dmac); 8060c1c8ff3SYoshihiro Shimoda 8070c1c8ff3SYoshihiro Shimoda if (ret) { 8080c1c8ff3SYoshihiro Shimoda dev_err(&pdev->dev, "failed to reset device\n"); 8090c1c8ff3SYoshihiro Shimoda goto error; 8100c1c8ff3SYoshihiro Shimoda } 8110c1c8ff3SYoshihiro Shimoda 8120c1c8ff3SYoshihiro Shimoda /* Initialize the channels. */ 8130c1c8ff3SYoshihiro Shimoda INIT_LIST_HEAD(&dmac->engine.channels); 8140c1c8ff3SYoshihiro Shimoda 8150c1c8ff3SYoshihiro Shimoda for (i = 0; i < dmac->n_channels; ++i) { 8160c1c8ff3SYoshihiro Shimoda ret = usb_dmac_chan_probe(dmac, &dmac->channels[i], i); 8170c1c8ff3SYoshihiro Shimoda if (ret < 0) 8180c1c8ff3SYoshihiro Shimoda goto error; 8190c1c8ff3SYoshihiro Shimoda } 8200c1c8ff3SYoshihiro Shimoda 8210c1c8ff3SYoshihiro Shimoda /* Register the DMAC as a DMA provider for DT. */ 8220c1c8ff3SYoshihiro Shimoda ret = of_dma_controller_register(pdev->dev.of_node, usb_dmac_of_xlate, 8230c1c8ff3SYoshihiro Shimoda NULL); 8240c1c8ff3SYoshihiro Shimoda if (ret < 0) 8250c1c8ff3SYoshihiro Shimoda goto error; 8260c1c8ff3SYoshihiro Shimoda 8270c1c8ff3SYoshihiro Shimoda /* 8280c1c8ff3SYoshihiro Shimoda * Register the DMA engine device. 8290c1c8ff3SYoshihiro Shimoda * 8300c1c8ff3SYoshihiro Shimoda * Default transfer size of 32 bytes requires 32-byte alignment. 8310c1c8ff3SYoshihiro Shimoda */ 8320c1c8ff3SYoshihiro Shimoda engine = &dmac->engine; 8330c1c8ff3SYoshihiro Shimoda dma_cap_set(DMA_SLAVE, engine->cap_mask); 8340c1c8ff3SYoshihiro Shimoda 8350c1c8ff3SYoshihiro Shimoda engine->dev = &pdev->dev; 8360c1c8ff3SYoshihiro Shimoda 8370c1c8ff3SYoshihiro Shimoda engine->src_addr_widths = widths; 8380c1c8ff3SYoshihiro Shimoda engine->dst_addr_widths = widths; 8390c1c8ff3SYoshihiro Shimoda engine->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM); 8400c1c8ff3SYoshihiro Shimoda engine->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; 8410c1c8ff3SYoshihiro Shimoda 8420c1c8ff3SYoshihiro Shimoda engine->device_alloc_chan_resources = usb_dmac_alloc_chan_resources; 8430c1c8ff3SYoshihiro Shimoda engine->device_free_chan_resources = usb_dmac_free_chan_resources; 8440c1c8ff3SYoshihiro Shimoda engine->device_prep_slave_sg = usb_dmac_prep_slave_sg; 8450c1c8ff3SYoshihiro Shimoda engine->device_terminate_all = usb_dmac_chan_terminate_all; 8460c1c8ff3SYoshihiro Shimoda engine->device_tx_status = usb_dmac_tx_status; 8470c1c8ff3SYoshihiro Shimoda engine->device_issue_pending = usb_dmac_issue_pending; 8480c1c8ff3SYoshihiro Shimoda 8490c1c8ff3SYoshihiro Shimoda ret = dma_async_device_register(engine); 8500c1c8ff3SYoshihiro Shimoda if (ret < 0) 8510c1c8ff3SYoshihiro Shimoda goto error; 8520c1c8ff3SYoshihiro Shimoda 85336fa4a53SGeert Uytterhoeven pm_runtime_put(&pdev->dev); 8540c1c8ff3SYoshihiro Shimoda return 0; 8550c1c8ff3SYoshihiro Shimoda 8560c1c8ff3SYoshihiro Shimoda error: 8570c1c8ff3SYoshihiro Shimoda of_dma_controller_free(pdev->dev.of_node); 85836fa4a53SGeert Uytterhoeven pm_runtime_put(&pdev->dev); 859bf55555bSGeert Uytterhoeven error_pm: 8600c1c8ff3SYoshihiro Shimoda pm_runtime_disable(&pdev->dev); 8610c1c8ff3SYoshihiro Shimoda return ret; 8620c1c8ff3SYoshihiro Shimoda } 8630c1c8ff3SYoshihiro Shimoda 8640c1c8ff3SYoshihiro Shimoda static void usb_dmac_chan_remove(struct usb_dmac *dmac, 8650c1c8ff3SYoshihiro Shimoda struct usb_dmac_chan *uchan) 8660c1c8ff3SYoshihiro Shimoda { 8670c1c8ff3SYoshihiro Shimoda usb_dmac_chan_halt(uchan); 8680c1c8ff3SYoshihiro Shimoda devm_free_irq(dmac->dev, uchan->irq, uchan); 8690c1c8ff3SYoshihiro Shimoda } 8700c1c8ff3SYoshihiro Shimoda 8710c1c8ff3SYoshihiro Shimoda static int usb_dmac_remove(struct platform_device *pdev) 8720c1c8ff3SYoshihiro Shimoda { 8730c1c8ff3SYoshihiro Shimoda struct usb_dmac *dmac = platform_get_drvdata(pdev); 8740c1c8ff3SYoshihiro Shimoda int i; 8750c1c8ff3SYoshihiro Shimoda 8760c1c8ff3SYoshihiro Shimoda for (i = 0; i < dmac->n_channels; ++i) 8770c1c8ff3SYoshihiro Shimoda usb_dmac_chan_remove(dmac, &dmac->channels[i]); 8780c1c8ff3SYoshihiro Shimoda of_dma_controller_free(pdev->dev.of_node); 8790c1c8ff3SYoshihiro Shimoda dma_async_device_unregister(&dmac->engine); 8800c1c8ff3SYoshihiro Shimoda 8810c1c8ff3SYoshihiro Shimoda pm_runtime_disable(&pdev->dev); 8820c1c8ff3SYoshihiro Shimoda 8830c1c8ff3SYoshihiro Shimoda return 0; 8840c1c8ff3SYoshihiro Shimoda } 8850c1c8ff3SYoshihiro Shimoda 8860c1c8ff3SYoshihiro Shimoda static void usb_dmac_shutdown(struct platform_device *pdev) 8870c1c8ff3SYoshihiro Shimoda { 8880c1c8ff3SYoshihiro Shimoda struct usb_dmac *dmac = platform_get_drvdata(pdev); 8890c1c8ff3SYoshihiro Shimoda 8900c1c8ff3SYoshihiro Shimoda usb_dmac_stop(dmac); 8910c1c8ff3SYoshihiro Shimoda } 8920c1c8ff3SYoshihiro Shimoda 8930c1c8ff3SYoshihiro Shimoda static const struct of_device_id usb_dmac_of_ids[] = { 8940c1c8ff3SYoshihiro Shimoda { .compatible = "renesas,usb-dmac", }, 8950c1c8ff3SYoshihiro Shimoda { /* Sentinel */ } 8960c1c8ff3SYoshihiro Shimoda }; 8970c1c8ff3SYoshihiro Shimoda MODULE_DEVICE_TABLE(of, usb_dmac_of_ids); 8980c1c8ff3SYoshihiro Shimoda 8990c1c8ff3SYoshihiro Shimoda static struct platform_driver usb_dmac_driver = { 9000c1c8ff3SYoshihiro Shimoda .driver = { 9010c1c8ff3SYoshihiro Shimoda .pm = &usb_dmac_pm, 9020c1c8ff3SYoshihiro Shimoda .name = "usb-dmac", 9030c1c8ff3SYoshihiro Shimoda .of_match_table = usb_dmac_of_ids, 9040c1c8ff3SYoshihiro Shimoda }, 9050c1c8ff3SYoshihiro Shimoda .probe = usb_dmac_probe, 9060c1c8ff3SYoshihiro Shimoda .remove = usb_dmac_remove, 9070c1c8ff3SYoshihiro Shimoda .shutdown = usb_dmac_shutdown, 9080c1c8ff3SYoshihiro Shimoda }; 9090c1c8ff3SYoshihiro Shimoda 9100c1c8ff3SYoshihiro Shimoda module_platform_driver(usb_dmac_driver); 9110c1c8ff3SYoshihiro Shimoda 9120c1c8ff3SYoshihiro Shimoda MODULE_DESCRIPTION("Renesas USB DMA Controller Driver"); 9130c1c8ff3SYoshihiro Shimoda MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>"); 9140c1c8ff3SYoshihiro Shimoda MODULE_LICENSE("GPL v2"); 915