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 */
saa7164_buffer_alloc(struct saa7164_port * port,u32 len)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
saa7164_buffer_dealloc(struct saa7164_buffer * buf)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
saa7164_buffer_zero_offsets(struct saa7164_port * port,int i)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 */
saa7164_buffer_activate(struct saa7164_buffer * buf,int i)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
saa7164_buffer_cfg_port(struct saa7164_port * port)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
saa7164_buffer_alloc_user(struct saa7164_dev * dev,u32 len)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
saa7164_buffer_dealloc_user(struct saa7164_user_buffer * buf)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