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 void saa7164_buffer_display(struct saa7164_buffer *buf) 56 { 57 struct saa7164_dev *dev = buf->port->dev; 58 int i; 59 60 dprintk(DBGLVL_BUF, "%s() buffer @ 0x%p nr=%d\n", 61 __func__, buf, buf->idx); 62 dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08llx len = 0x%x\n", 63 buf->cpu, (long long)buf->dma, buf->pci_size); 64 dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08llx len = 0x%x\n", 65 buf->pt_cpu, (long long)buf->pt_dma, buf->pt_size); 66 67 /* Format the Page Table Entries to point into the data buffer */ 68 for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) { 69 70 dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n", 71 i, buf->pt_cpu, (u64)*(buf->pt_cpu)); 72 73 } 74 } 75 /* Allocate a new buffer structure and associated PCI space in bytes. 76 * len must be a multiple of sizeof(u64) 77 */ 78 struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_port *port, 79 u32 len) 80 { 81 struct tmHWStreamParameters *params = &port->hw_streamingparams; 82 struct saa7164_buffer *buf = NULL; 83 struct saa7164_dev *dev = port->dev; 84 int i; 85 86 if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) { 87 log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__); 88 goto ret; 89 } 90 91 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 92 if (!buf) 93 goto ret; 94 95 buf->idx = -1; 96 buf->port = port; 97 buf->flags = SAA7164_BUFFER_FREE; 98 buf->pos = 0; 99 buf->actual_size = params->pitch * params->numberoflines; 100 buf->crc = 0; 101 /* TODO: arg len is being ignored */ 102 buf->pci_size = SAA7164_PT_ENTRIES * 0x1000; 103 buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000; 104 105 /* Allocate contiguous memory */ 106 buf->cpu = dma_alloc_coherent(&port->dev->pci->dev, buf->pci_size, 107 &buf->dma, GFP_KERNEL); 108 if (!buf->cpu) 109 goto fail1; 110 111 buf->pt_cpu = dma_alloc_coherent(&port->dev->pci->dev, buf->pt_size, 112 &buf->pt_dma, GFP_KERNEL); 113 if (!buf->pt_cpu) 114 goto fail2; 115 116 /* init the buffers to a known pattern, easier during debugging */ 117 memset(buf->cpu, 0xff, buf->pci_size); 118 buf->crc = crc32(0, buf->cpu, buf->actual_size); 119 memset(buf->pt_cpu, 0xff, buf->pt_size); 120 121 dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p (%d pageptrs)\n", 122 __func__, buf, params->numpagetables); 123 dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08lx len = 0x%x\n", 124 buf->cpu, (long)buf->dma, buf->pci_size); 125 dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n", 126 buf->pt_cpu, (long)buf->pt_dma, buf->pt_size); 127 128 /* Format the Page Table Entries to point into the data buffer */ 129 for (i = 0 ; i < params->numpagetables; i++) { 130 131 *(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */ 132 dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n", 133 i, buf->pt_cpu, (u64)*(buf->pt_cpu)); 134 135 } 136 137 goto ret; 138 139 fail2: 140 dma_free_coherent(&port->dev->pci->dev, buf->pci_size, buf->cpu, 141 buf->dma); 142 fail1: 143 kfree(buf); 144 145 buf = NULL; 146 ret: 147 return buf; 148 } 149 150 int saa7164_buffer_dealloc(struct saa7164_buffer *buf) 151 { 152 struct saa7164_dev *dev; 153 154 if (!buf || !buf->port) 155 return SAA_ERR_BAD_PARAMETER; 156 dev = buf->port->dev; 157 158 dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n", 159 __func__, buf); 160 161 if (buf->flags != SAA7164_BUFFER_FREE) 162 log_warn(" freeing a non-free buffer\n"); 163 164 dma_free_coherent(&dev->pci->dev, buf->pci_size, buf->cpu, buf->dma); 165 dma_free_coherent(&dev->pci->dev, buf->pt_size, buf->pt_cpu, 166 buf->pt_dma); 167 168 kfree(buf); 169 170 return SAA_OK; 171 } 172 173 int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i) 174 { 175 struct saa7164_dev *dev = port->dev; 176 177 if ((i < 0) || (i >= port->hwcfg.buffercount)) 178 return -EINVAL; 179 180 dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i); 181 182 saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0); 183 184 return 0; 185 } 186 187 /* Write a buffer into the hardware */ 188 int saa7164_buffer_activate(struct saa7164_buffer *buf, int i) 189 { 190 struct saa7164_port *port = buf->port; 191 struct saa7164_dev *dev = port->dev; 192 193 if ((i < 0) || (i >= port->hwcfg.buffercount)) 194 return -EINVAL; 195 196 dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i); 197 198 buf->idx = i; /* Note of which buffer list index position we occupy */ 199 buf->flags = SAA7164_BUFFER_BUSY; 200 buf->pos = 0; 201 202 /* TODO: Review this in light of 32v64 assignments */ 203 saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0); 204 saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma); 205 saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0); 206 207 dprintk(DBGLVL_BUF, " buf[%d] offset 0x%llx (0x%x) buf 0x%llx/%llx (0x%x/%x) nr=%d\n", 208 buf->idx, 209 (u64)port->bufoffset + (i * sizeof(u32)), 210 saa7164_readl(port->bufoffset + (sizeof(u32) * i)), 211 (u64)port->bufptr32h + ((sizeof(u32) * 2) * i), 212 (u64)port->bufptr32l + ((sizeof(u32) * 2) * i), 213 saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)), 214 saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)), 215 buf->idx); 216 217 return 0; 218 } 219 220 int saa7164_buffer_cfg_port(struct saa7164_port *port) 221 { 222 struct tmHWStreamParameters *params = &port->hw_streamingparams; 223 struct saa7164_dev *dev = port->dev; 224 struct saa7164_buffer *buf; 225 struct list_head *c, *n; 226 int i = 0; 227 228 dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr); 229 230 saa7164_writel(port->bufcounter, 0); 231 saa7164_writel(port->pitch, params->pitch); 232 saa7164_writel(port->bufsize, params->pitch * params->numberoflines); 233 234 dprintk(DBGLVL_BUF, " configured:\n"); 235 dprintk(DBGLVL_BUF, " lmmio 0x%p\n", dev->lmmio); 236 dprintk(DBGLVL_BUF, " bufcounter 0x%x = 0x%x\n", port->bufcounter, 237 saa7164_readl(port->bufcounter)); 238 239 dprintk(DBGLVL_BUF, " pitch 0x%x = %d\n", port->pitch, 240 saa7164_readl(port->pitch)); 241 242 dprintk(DBGLVL_BUF, " bufsize 0x%x = %d\n", port->bufsize, 243 saa7164_readl(port->bufsize)); 244 245 dprintk(DBGLVL_BUF, " buffercount = %d\n", port->hwcfg.buffercount); 246 dprintk(DBGLVL_BUF, " bufoffset = 0x%x\n", port->bufoffset); 247 dprintk(DBGLVL_BUF, " bufptr32h = 0x%x\n", port->bufptr32h); 248 dprintk(DBGLVL_BUF, " bufptr32l = 0x%x\n", port->bufptr32l); 249 250 /* Poke the buffers and offsets into PCI space */ 251 mutex_lock(&port->dmaqueue_lock); 252 list_for_each_safe(c, n, &port->dmaqueue.list) { 253 buf = list_entry(c, struct saa7164_buffer, list); 254 255 BUG_ON(buf->flags != SAA7164_BUFFER_FREE); 256 257 /* Place the buffer in the h/w queue */ 258 saa7164_buffer_activate(buf, i); 259 260 /* Don't exceed the device maximum # bufs */ 261 BUG_ON(i > port->hwcfg.buffercount); 262 i++; 263 264 } 265 mutex_unlock(&port->dmaqueue_lock); 266 267 return 0; 268 } 269 270 struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev, 271 u32 len) 272 { 273 struct saa7164_user_buffer *buf; 274 275 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 276 if (!buf) 277 return NULL; 278 279 buf->data = kzalloc(len, GFP_KERNEL); 280 281 if (!buf->data) { 282 kfree(buf); 283 return NULL; 284 } 285 286 buf->actual_size = len; 287 buf->pos = 0; 288 buf->crc = 0; 289 290 dprintk(DBGLVL_BUF, "%s() allocated user buffer @ 0x%p\n", 291 __func__, buf); 292 293 return buf; 294 } 295 296 void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf) 297 { 298 if (!buf) 299 return; 300 301 kfree(buf->data); 302 buf->data = NULL; 303 304 kfree(buf); 305 } 306