1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for the NXP SAA7164 PCIe bridge 4 * 5 * Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com> 6 */ 7 8 #include <linux/slab.h> 9 10 #include "saa7164.h" 11 12 /* The PCI address space for buffer handling looks like this: 13 * 14 * +-u32 wide-------------+ 15 * | + 16 * +-u64 wide------------------------------------+ 17 * + + 18 * +----------------------+ 19 * | CurrentBufferPtr + Pointer to current PCI buffer >-+ 20 * +----------------------+ | 21 * | Unused + | 22 * +----------------------+ | 23 * | Pitch + = 188 (bytes) | 24 * +----------------------+ | 25 * | PCI buffer size + = pitch * number of lines (312) | 26 * +----------------------+ | 27 * |0| Buf0 Write Offset + | 28 * +----------------------+ v 29 * |1| Buf1 Write Offset + | 30 * +----------------------+ | 31 * |2| Buf2 Write Offset + | 32 * +----------------------+ | 33 * |3| Buf3 Write Offset + | 34 * +----------------------+ | 35 * ... More write offsets | 36 * +---------------------------------------------+ | 37 * +0| set of ptrs to PCI pagetables + | 38 * +---------------------------------------------+ | 39 * +1| set of ptrs to PCI pagetables + <--------+ 40 * +---------------------------------------------+ 41 * +2| set of ptrs to PCI pagetables + 42 * +---------------------------------------------+ 43 * +3| set of ptrs to PCI pagetables + >--+ 44 * +---------------------------------------------+ | 45 * ... More buffer pointers | +----------------+ 46 * +->| pt[0] TS data | 47 * | +----------------+ 48 * | 49 * | +----------------+ 50 * +->| pt[1] TS data | 51 * | +----------------+ 52 * | etc 53 */ 54 55 /* Allocate a new buffer structure and associated PCI space in bytes. 56 * len must be a multiple of sizeof(u64) 57 */ 58 struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_port *port, 59 u32 len) 60 { 61 struct tmHWStreamParameters *params = &port->hw_streamingparams; 62 struct saa7164_buffer *buf = NULL; 63 struct saa7164_dev *dev = port->dev; 64 int i; 65 66 if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) { 67 log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__); 68 goto ret; 69 } 70 71 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 72 if (!buf) 73 goto ret; 74 75 buf->idx = -1; 76 buf->port = port; 77 buf->flags = SAA7164_BUFFER_FREE; 78 buf->pos = 0; 79 buf->actual_size = params->pitch * params->numberoflines; 80 buf->crc = 0; 81 /* TODO: arg len is being ignored */ 82 buf->pci_size = SAA7164_PT_ENTRIES * 0x1000; 83 buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000; 84 85 /* Allocate contiguous memory */ 86 buf->cpu = dma_alloc_coherent(&port->dev->pci->dev, buf->pci_size, 87 &buf->dma, GFP_KERNEL); 88 if (!buf->cpu) 89 goto fail1; 90 91 buf->pt_cpu = dma_alloc_coherent(&port->dev->pci->dev, buf->pt_size, 92 &buf->pt_dma, GFP_KERNEL); 93 if (!buf->pt_cpu) 94 goto fail2; 95 96 /* init the buffers to a known pattern, easier during debugging */ 97 memset(buf->cpu, 0xff, buf->pci_size); 98 buf->crc = crc32(0, buf->cpu, buf->actual_size); 99 memset(buf->pt_cpu, 0xff, buf->pt_size); 100 101 dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p (%d pageptrs)\n", 102 __func__, buf, params->numpagetables); 103 dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08lx len = 0x%x\n", 104 buf->cpu, (long)buf->dma, buf->pci_size); 105 dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n", 106 buf->pt_cpu, (long)buf->pt_dma, buf->pt_size); 107 108 /* Format the Page Table Entries to point into the data buffer */ 109 for (i = 0 ; i < params->numpagetables; i++) { 110 111 *(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */ 112 dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n", 113 i, buf->pt_cpu, (u64)*(buf->pt_cpu)); 114 115 } 116 117 goto ret; 118 119 fail2: 120 dma_free_coherent(&port->dev->pci->dev, buf->pci_size, buf->cpu, 121 buf->dma); 122 fail1: 123 kfree(buf); 124 125 buf = NULL; 126 ret: 127 return buf; 128 } 129 130 int saa7164_buffer_dealloc(struct saa7164_buffer *buf) 131 { 132 struct saa7164_dev *dev; 133 134 if (!buf || !buf->port) 135 return SAA_ERR_BAD_PARAMETER; 136 dev = buf->port->dev; 137 138 dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n", 139 __func__, buf); 140 141 if (buf->flags != SAA7164_BUFFER_FREE) 142 log_warn(" freeing a non-free buffer\n"); 143 144 dma_free_coherent(&dev->pci->dev, buf->pci_size, buf->cpu, buf->dma); 145 dma_free_coherent(&dev->pci->dev, buf->pt_size, buf->pt_cpu, 146 buf->pt_dma); 147 148 kfree(buf); 149 150 return SAA_OK; 151 } 152 153 int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i) 154 { 155 struct saa7164_dev *dev = port->dev; 156 157 if ((i < 0) || (i >= port->hwcfg.buffercount)) 158 return -EINVAL; 159 160 dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i); 161 162 saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0); 163 164 return 0; 165 } 166 167 /* Write a buffer into the hardware */ 168 int saa7164_buffer_activate(struct saa7164_buffer *buf, int i) 169 { 170 struct saa7164_port *port = buf->port; 171 struct saa7164_dev *dev = port->dev; 172 173 if ((i < 0) || (i >= port->hwcfg.buffercount)) 174 return -EINVAL; 175 176 dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i); 177 178 buf->idx = i; /* Note of which buffer list index position we occupy */ 179 buf->flags = SAA7164_BUFFER_BUSY; 180 buf->pos = 0; 181 182 /* TODO: Review this in light of 32v64 assignments */ 183 saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0); 184 saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma); 185 saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0); 186 187 dprintk(DBGLVL_BUF, " buf[%d] offset 0x%llx (0x%x) buf 0x%llx/%llx (0x%x/%x) nr=%d\n", 188 buf->idx, 189 (u64)port->bufoffset + (i * sizeof(u32)), 190 saa7164_readl(port->bufoffset + (sizeof(u32) * i)), 191 (u64)port->bufptr32h + ((sizeof(u32) * 2) * i), 192 (u64)port->bufptr32l + ((sizeof(u32) * 2) * i), 193 saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)), 194 saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)), 195 buf->idx); 196 197 return 0; 198 } 199 200 int saa7164_buffer_cfg_port(struct saa7164_port *port) 201 { 202 struct tmHWStreamParameters *params = &port->hw_streamingparams; 203 struct saa7164_dev *dev = port->dev; 204 struct saa7164_buffer *buf; 205 struct list_head *c, *n; 206 int i = 0; 207 208 dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr); 209 210 saa7164_writel(port->bufcounter, 0); 211 saa7164_writel(port->pitch, params->pitch); 212 saa7164_writel(port->bufsize, params->pitch * params->numberoflines); 213 214 dprintk(DBGLVL_BUF, " configured:\n"); 215 dprintk(DBGLVL_BUF, " lmmio 0x%p\n", dev->lmmio); 216 dprintk(DBGLVL_BUF, " bufcounter 0x%x = 0x%x\n", port->bufcounter, 217 saa7164_readl(port->bufcounter)); 218 219 dprintk(DBGLVL_BUF, " pitch 0x%x = %d\n", port->pitch, 220 saa7164_readl(port->pitch)); 221 222 dprintk(DBGLVL_BUF, " bufsize 0x%x = %d\n", port->bufsize, 223 saa7164_readl(port->bufsize)); 224 225 dprintk(DBGLVL_BUF, " buffercount = %d\n", port->hwcfg.buffercount); 226 dprintk(DBGLVL_BUF, " bufoffset = 0x%x\n", port->bufoffset); 227 dprintk(DBGLVL_BUF, " bufptr32h = 0x%x\n", port->bufptr32h); 228 dprintk(DBGLVL_BUF, " bufptr32l = 0x%x\n", port->bufptr32l); 229 230 /* Poke the buffers and offsets into PCI space */ 231 mutex_lock(&port->dmaqueue_lock); 232 list_for_each_safe(c, n, &port->dmaqueue.list) { 233 buf = list_entry(c, struct saa7164_buffer, list); 234 235 BUG_ON(buf->flags != SAA7164_BUFFER_FREE); 236 237 /* Place the buffer in the h/w queue */ 238 saa7164_buffer_activate(buf, i); 239 240 /* Don't exceed the device maximum # bufs */ 241 BUG_ON(i > port->hwcfg.buffercount); 242 i++; 243 244 } 245 mutex_unlock(&port->dmaqueue_lock); 246 247 return 0; 248 } 249 250 struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev, 251 u32 len) 252 { 253 struct saa7164_user_buffer *buf; 254 255 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 256 if (!buf) 257 return NULL; 258 259 buf->data = kzalloc(len, GFP_KERNEL); 260 261 if (!buf->data) { 262 kfree(buf); 263 return NULL; 264 } 265 266 buf->actual_size = len; 267 buf->pos = 0; 268 buf->crc = 0; 269 270 dprintk(DBGLVL_BUF, "%s() allocated user buffer @ 0x%p\n", 271 __func__, buf); 272 273 return buf; 274 } 275 276 void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf) 277 { 278 if (!buf) 279 return; 280 281 kfree(buf->data); 282 buf->data = NULL; 283 284 kfree(buf); 285 } 286