2 * Driver for the NXP SAA7164 PCIe bridge
4 * Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 #include <linux/slab.h>
22 /* The PCI address space for buffer handling looks like this:
24 * +-u32 wide-------------+
26 * +-u64 wide------------------------------------+
28 * +----------------------+
29 * | CurrentBufferPtr + Pointer to current PCI buffer >-+
30 * +----------------------+ |
32 * +----------------------+ |
33 * | Pitch + = 188 (bytes) |
34 * +----------------------+ |
35 * | PCI buffer size + = pitch * number of lines (312) |
36 * +----------------------+ |
37 * |0| Buf0 Write Offset + |
38 * +----------------------+ v
39 * |1| Buf1 Write Offset + |
40 * +----------------------+ |
41 * |2| Buf2 Write Offset + |
42 * +----------------------+ |
43 * |3| Buf3 Write Offset + |
44 * +----------------------+ |
45 * ... More write offsets |
46 * +---------------------------------------------+ |
47 * +0| set of ptrs to PCI pagetables + |
48 * +---------------------------------------------+ |
49 * +1| set of ptrs to PCI pagetables + <--------+
50 * +---------------------------------------------+
51 * +2| set of ptrs to PCI pagetables +
52 * +---------------------------------------------+
53 * +3| set of ptrs to PCI pagetables + >--+
54 * +---------------------------------------------+ |
55 * ... More buffer pointers | +----------------+
56 * +->| pt[0] TS data |
57 * | +----------------+
59 * | +----------------+
60 * +->| pt[1] TS data |
61 * | +----------------+
65 void saa7164_buffer_display(struct saa7164_buffer *buf)
67 struct saa7164_dev *dev = buf->port->dev;
70 dprintk(DBGLVL_BUF, "%s() buffer @ 0x%p nr=%d\n",
71 __func__, buf, buf->idx);
72 dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08llx len = 0x%x\n",
73 buf->cpu, (long long)buf->dma, buf->pci_size);
74 dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08llx len = 0x%x\n",
75 buf->pt_cpu, (long long)buf->pt_dma, buf->pt_size);
77 /* Format the Page Table Entries to point into the data buffer */
78 for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
80 dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
81 i, buf->pt_cpu, (u64)*(buf->pt_cpu));
85 /* Allocate a new buffer structure and associated PCI space in bytes.
86 * len must be a multiple of sizeof(u64)
88 struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_port *port,
91 struct tmHWStreamParameters *params = &port->hw_streamingparams;
92 struct saa7164_buffer *buf = NULL;
93 struct saa7164_dev *dev = port->dev;
96 if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) {
97 log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__);
101 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
107 buf->flags = SAA7164_BUFFER_FREE;
109 buf->actual_size = params->pitch * params->numberoflines;
111 /* TODO: arg len is being ignored */
112 buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
113 buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;
115 /* Allocate contiguous memory */
116 buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
121 buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
126 /* init the buffers to a known pattern, easier during debugging */
127 memset(buf->cpu, 0xff, buf->pci_size);
128 buf->crc = crc32(0, buf->cpu, buf->actual_size);
129 memset(buf->pt_cpu, 0xff, buf->pt_size);
131 dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p (%d pageptrs)\n",
132 __func__, buf, params->numpagetables);
133 dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08lx len = 0x%x\n",
134 buf->cpu, (long)buf->dma, buf->pci_size);
135 dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
136 buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);
138 /* Format the Page Table Entries to point into the data buffer */
139 for (i = 0 ; i < params->numpagetables; i++) {
141 *(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
142 dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
143 i, buf->pt_cpu, (u64)*(buf->pt_cpu));
150 pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
159 int saa7164_buffer_dealloc(struct saa7164_buffer *buf)
161 struct saa7164_dev *dev;
163 if (!buf || !buf->port)
164 return SAA_ERR_BAD_PARAMETER;
165 dev = buf->port->dev;
167 dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n",
170 if (buf->flags != SAA7164_BUFFER_FREE)
171 log_warn(" freeing a non-free buffer\n");
173 pci_free_consistent(dev->pci, buf->pci_size, buf->cpu, buf->dma);
174 pci_free_consistent(dev->pci, buf->pt_size, buf->pt_cpu, buf->pt_dma);
181 int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i)
183 struct saa7164_dev *dev = port->dev;
185 if ((i < 0) || (i >= port->hwcfg.buffercount))
188 dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
190 saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
195 /* Write a buffer into the hardware */
196 int saa7164_buffer_activate(struct saa7164_buffer *buf, int i)
198 struct saa7164_port *port = buf->port;
199 struct saa7164_dev *dev = port->dev;
201 if ((i < 0) || (i >= port->hwcfg.buffercount))
204 dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
206 buf->idx = i; /* Note of which buffer list index position we occupy */
207 buf->flags = SAA7164_BUFFER_BUSY;
210 /* TODO: Review this in light of 32v64 assignments */
211 saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
212 saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma);
213 saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0);
215 dprintk(DBGLVL_BUF, " buf[%d] offset 0x%llx (0x%x) buf 0x%llx/%llx (0x%x/%x) nr=%d\n",
217 (u64)port->bufoffset + (i * sizeof(u32)),
218 saa7164_readl(port->bufoffset + (sizeof(u32) * i)),
219 (u64)port->bufptr32h + ((sizeof(u32) * 2) * i),
220 (u64)port->bufptr32l + ((sizeof(u32) * 2) * i),
221 saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)),
222 saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)),
228 int saa7164_buffer_cfg_port(struct saa7164_port *port)
230 struct tmHWStreamParameters *params = &port->hw_streamingparams;
231 struct saa7164_dev *dev = port->dev;
232 struct saa7164_buffer *buf;
233 struct list_head *c, *n;
236 dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr);
238 saa7164_writel(port->bufcounter, 0);
239 saa7164_writel(port->pitch, params->pitch);
240 saa7164_writel(port->bufsize, params->pitch * params->numberoflines);
242 dprintk(DBGLVL_BUF, " configured:\n");
243 dprintk(DBGLVL_BUF, " lmmio 0x%p\n", dev->lmmio);
244 dprintk(DBGLVL_BUF, " bufcounter 0x%x = 0x%x\n", port->bufcounter,
245 saa7164_readl(port->bufcounter));
247 dprintk(DBGLVL_BUF, " pitch 0x%x = %d\n", port->pitch,
248 saa7164_readl(port->pitch));
250 dprintk(DBGLVL_BUF, " bufsize 0x%x = %d\n", port->bufsize,
251 saa7164_readl(port->bufsize));
253 dprintk(DBGLVL_BUF, " buffercount = %d\n", port->hwcfg.buffercount);
254 dprintk(DBGLVL_BUF, " bufoffset = 0x%x\n", port->bufoffset);
255 dprintk(DBGLVL_BUF, " bufptr32h = 0x%x\n", port->bufptr32h);
256 dprintk(DBGLVL_BUF, " bufptr32l = 0x%x\n", port->bufptr32l);
258 /* Poke the buffers and offsets into PCI space */
259 mutex_lock(&port->dmaqueue_lock);
260 list_for_each_safe(c, n, &port->dmaqueue.list) {
261 buf = list_entry(c, struct saa7164_buffer, list);
263 if (buf->flags != SAA7164_BUFFER_FREE)
266 /* Place the buffer in the h/w queue */
267 saa7164_buffer_activate(buf, i);
269 /* Don't exceed the device maximum # bufs */
270 if (i++ > port->hwcfg.buffercount)
274 mutex_unlock(&port->dmaqueue_lock);
279 struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev,
282 struct saa7164_user_buffer *buf;
284 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
288 buf->data = kzalloc(len, GFP_KERNEL);
295 buf->actual_size = len;
299 dprintk(DBGLVL_BUF, "%s() allocated user buffer @ 0x%p\n",
305 void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf)