1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2010-2013 Bluecherry, LLC <https://www.bluecherrydvr.com>
4 *
5 * Original author:
6 * Ben Collins <bcollins@ubuntu.com>
7 *
8 * Additional work by:
9 * John Brooks <john.brooks@bluecherry.net>
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15
16 #include "solo6x10.h"
17
18 static int multi_p2m;
19 module_param(multi_p2m, uint, 0644);
20 MODULE_PARM_DESC(multi_p2m,
21 "Use multiple P2M DMA channels (default: no, 6010-only)");
22
23 static int desc_mode;
24 module_param(desc_mode, uint, 0644);
25 MODULE_PARM_DESC(desc_mode,
26 "Allow use of descriptor mode DMA (default: no, 6010-only)");
27
solo_p2m_dma(struct solo_dev * solo_dev,int wr,void * sys_addr,u32 ext_addr,u32 size,int repeat,u32 ext_size)28 int solo_p2m_dma(struct solo_dev *solo_dev, int wr,
29 void *sys_addr, u32 ext_addr, u32 size,
30 int repeat, u32 ext_size)
31 {
32 dma_addr_t dma_addr;
33 int ret;
34
35 if (WARN_ON_ONCE((unsigned long)sys_addr & 0x03))
36 return -EINVAL;
37 if (WARN_ON_ONCE(!size))
38 return -EINVAL;
39
40 dma_addr = dma_map_single(&solo_dev->pdev->dev, sys_addr, size,
41 wr ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
42 if (dma_mapping_error(&solo_dev->pdev->dev, dma_addr))
43 return -ENOMEM;
44
45 ret = solo_p2m_dma_t(solo_dev, wr, dma_addr, ext_addr, size,
46 repeat, ext_size);
47
48 dma_unmap_single(&solo_dev->pdev->dev, dma_addr, size,
49 wr ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
50
51 return ret;
52 }
53
54 /* Mutex must be held for p2m_id before calling this!! */
solo_p2m_dma_desc(struct solo_dev * solo_dev,struct solo_p2m_desc * desc,dma_addr_t desc_dma,int desc_cnt)55 int solo_p2m_dma_desc(struct solo_dev *solo_dev,
56 struct solo_p2m_desc *desc, dma_addr_t desc_dma,
57 int desc_cnt)
58 {
59 struct solo_p2m_dev *p2m_dev;
60 unsigned int timeout;
61 unsigned int config = 0;
62 int ret = 0;
63 unsigned int p2m_id = 0;
64
65 /* Get next ID. According to Softlogic, 6110 has problems on !=0 P2M */
66 if (solo_dev->type != SOLO_DEV_6110 && multi_p2m)
67 p2m_id = atomic_inc_return(&solo_dev->p2m_count) % SOLO_NR_P2M;
68
69 p2m_dev = &solo_dev->p2m_dev[p2m_id];
70
71 if (mutex_lock_interruptible(&p2m_dev->mutex))
72 return -EINTR;
73
74 reinit_completion(&p2m_dev->completion);
75 p2m_dev->error = 0;
76
77 if (desc_cnt > 1 && solo_dev->type != SOLO_DEV_6110 && desc_mode) {
78 /* For 6010 with more than one desc, we can do a one-shot */
79 p2m_dev->desc_count = p2m_dev->desc_idx = 0;
80 config = solo_reg_read(solo_dev, SOLO_P2M_CONFIG(p2m_id));
81
82 solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(p2m_id), desc_dma);
83 solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(p2m_id), desc_cnt);
84 solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config |
85 SOLO_P2M_DESC_MODE);
86 } else {
87 /* For single descriptors and 6110, we need to run each desc */
88 p2m_dev->desc_count = desc_cnt;
89 p2m_dev->desc_idx = 1;
90 p2m_dev->descs = desc;
91
92 solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(p2m_id),
93 desc[1].dma_addr);
94 solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(p2m_id),
95 desc[1].ext_addr);
96 solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(p2m_id),
97 desc[1].cfg);
98 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id),
99 desc[1].ctrl);
100 }
101
102 timeout = wait_for_completion_timeout(&p2m_dev->completion,
103 solo_dev->p2m_jiffies);
104
105 if (WARN_ON_ONCE(p2m_dev->error))
106 ret = -EIO;
107 else if (timeout == 0) {
108 solo_dev->p2m_timeouts++;
109 ret = -EAGAIN;
110 }
111
112 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id), 0);
113
114 /* Don't write here for the no_desc_mode case, because config is 0.
115 * We can't test no_desc_mode again, it might race. */
116 if (desc_cnt > 1 && solo_dev->type != SOLO_DEV_6110 && config)
117 solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config);
118
119 mutex_unlock(&p2m_dev->mutex);
120
121 return ret;
122 }
123
solo_p2m_fill_desc(struct solo_p2m_desc * desc,int wr,dma_addr_t dma_addr,u32 ext_addr,u32 size,int repeat,u32 ext_size)124 void solo_p2m_fill_desc(struct solo_p2m_desc *desc, int wr,
125 dma_addr_t dma_addr, u32 ext_addr, u32 size,
126 int repeat, u32 ext_size)
127 {
128 WARN_ON_ONCE(dma_addr & 0x03);
129 WARN_ON_ONCE(!size);
130
131 desc->cfg = SOLO_P2M_COPY_SIZE(size >> 2);
132 desc->ctrl = SOLO_P2M_BURST_SIZE(SOLO_P2M_BURST_256) |
133 (wr ? SOLO_P2M_WRITE : 0) | SOLO_P2M_TRANS_ON;
134
135 if (repeat) {
136 desc->cfg |= SOLO_P2M_EXT_INC(ext_size >> 2);
137 desc->ctrl |= SOLO_P2M_PCI_INC(size >> 2) |
138 SOLO_P2M_REPEAT(repeat);
139 }
140
141 desc->dma_addr = dma_addr;
142 desc->ext_addr = ext_addr;
143 }
144
solo_p2m_dma_t(struct solo_dev * solo_dev,int wr,dma_addr_t dma_addr,u32 ext_addr,u32 size,int repeat,u32 ext_size)145 int solo_p2m_dma_t(struct solo_dev *solo_dev, int wr,
146 dma_addr_t dma_addr, u32 ext_addr, u32 size,
147 int repeat, u32 ext_size)
148 {
149 struct solo_p2m_desc desc[2];
150
151 solo_p2m_fill_desc(&desc[1], wr, dma_addr, ext_addr, size, repeat,
152 ext_size);
153
154 /* No need for desc_dma since we know it is a single-shot */
155 return solo_p2m_dma_desc(solo_dev, desc, 0, 1);
156 }
157
solo_p2m_isr(struct solo_dev * solo_dev,int id)158 void solo_p2m_isr(struct solo_dev *solo_dev, int id)
159 {
160 struct solo_p2m_dev *p2m_dev = &solo_dev->p2m_dev[id];
161 struct solo_p2m_desc *desc;
162
163 if (p2m_dev->desc_count <= p2m_dev->desc_idx) {
164 complete(&p2m_dev->completion);
165 return;
166 }
167
168 /* Setup next descriptor */
169 p2m_dev->desc_idx++;
170 desc = &p2m_dev->descs[p2m_dev->desc_idx];
171
172 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
173 solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(id), desc->dma_addr);
174 solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(id), desc->ext_addr);
175 solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(id), desc->cfg);
176 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), desc->ctrl);
177 }
178
solo_p2m_error_isr(struct solo_dev * solo_dev)179 void solo_p2m_error_isr(struct solo_dev *solo_dev)
180 {
181 unsigned int err = solo_reg_read(solo_dev, SOLO_PCI_ERR);
182 struct solo_p2m_dev *p2m_dev;
183 int i;
184
185 if (!(err & (SOLO_PCI_ERR_P2M | SOLO_PCI_ERR_P2M_DESC)))
186 return;
187
188 for (i = 0; i < SOLO_NR_P2M; i++) {
189 p2m_dev = &solo_dev->p2m_dev[i];
190 p2m_dev->error = 1;
191 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
192 complete(&p2m_dev->completion);
193 }
194 }
195
solo_p2m_exit(struct solo_dev * solo_dev)196 void solo_p2m_exit(struct solo_dev *solo_dev)
197 {
198 int i;
199
200 for (i = 0; i < SOLO_NR_P2M; i++)
201 solo_irq_off(solo_dev, SOLO_IRQ_P2M(i));
202 }
203
solo_p2m_test(struct solo_dev * solo_dev,int base,int size)204 static int solo_p2m_test(struct solo_dev *solo_dev, int base, int size)
205 {
206 u32 *wr_buf;
207 u32 *rd_buf;
208 int i;
209 int ret = -EIO;
210 int order = get_order(size);
211
212 wr_buf = (u32 *)__get_free_pages(GFP_KERNEL, order);
213 if (wr_buf == NULL)
214 return -1;
215
216 rd_buf = (u32 *)__get_free_pages(GFP_KERNEL, order);
217 if (rd_buf == NULL) {
218 free_pages((unsigned long)wr_buf, order);
219 return -1;
220 }
221
222 for (i = 0; i < (size >> 3); i++)
223 *(wr_buf + i) = (i << 16) | (i + 1);
224
225 for (i = (size >> 3); i < (size >> 2); i++)
226 *(wr_buf + i) = ~((i << 16) | (i + 1));
227
228 memset(rd_buf, 0x55, size);
229
230 if (solo_p2m_dma(solo_dev, 1, wr_buf, base, size, 0, 0))
231 goto test_fail;
232
233 if (solo_p2m_dma(solo_dev, 0, rd_buf, base, size, 0, 0))
234 goto test_fail;
235
236 for (i = 0; i < (size >> 2); i++) {
237 if (*(wr_buf + i) != *(rd_buf + i))
238 goto test_fail;
239 }
240
241 ret = 0;
242
243 test_fail:
244 free_pages((unsigned long)wr_buf, order);
245 free_pages((unsigned long)rd_buf, order);
246
247 return ret;
248 }
249
solo_p2m_init(struct solo_dev * solo_dev)250 int solo_p2m_init(struct solo_dev *solo_dev)
251 {
252 struct solo_p2m_dev *p2m_dev;
253 int i;
254
255 for (i = 0; i < SOLO_NR_P2M; i++) {
256 p2m_dev = &solo_dev->p2m_dev[i];
257
258 mutex_init(&p2m_dev->mutex);
259 init_completion(&p2m_dev->completion);
260
261 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
262 solo_reg_write(solo_dev, SOLO_P2M_CONFIG(i),
263 SOLO_P2M_CSC_16BIT_565 |
264 SOLO_P2M_DESC_INTR_OPT |
265 SOLO_P2M_DMA_INTERVAL(0) |
266 SOLO_P2M_PCI_MASTER_MODE);
267 solo_irq_on(solo_dev, SOLO_IRQ_P2M(i));
268 }
269
270 /* Find correct SDRAM size */
271 for (solo_dev->sdram_size = 0, i = 2; i >= 0; i--) {
272 solo_reg_write(solo_dev, SOLO_DMA_CTRL,
273 SOLO_DMA_CTRL_REFRESH_CYCLE(1) |
274 SOLO_DMA_CTRL_SDRAM_SIZE(i) |
275 SOLO_DMA_CTRL_SDRAM_CLK_INVERT |
276 SOLO_DMA_CTRL_READ_CLK_SELECT |
277 SOLO_DMA_CTRL_LATENCY(1));
278
279 solo_reg_write(solo_dev, SOLO_SYS_CFG, solo_dev->sys_config |
280 SOLO_SYS_CFG_RESET);
281 solo_reg_write(solo_dev, SOLO_SYS_CFG, solo_dev->sys_config);
282
283 switch (i) {
284 case 2:
285 if (solo_p2m_test(solo_dev, 0x07ff0000, 0x00010000) ||
286 solo_p2m_test(solo_dev, 0x05ff0000, 0x00010000))
287 continue;
288 break;
289
290 case 1:
291 if (solo_p2m_test(solo_dev, 0x03ff0000, 0x00010000))
292 continue;
293 break;
294
295 default:
296 if (solo_p2m_test(solo_dev, 0x01ff0000, 0x00010000))
297 continue;
298 }
299
300 solo_dev->sdram_size = (32 << 20) << i;
301 break;
302 }
303
304 if (!solo_dev->sdram_size) {
305 dev_err(&solo_dev->pdev->dev, "Error detecting SDRAM size\n");
306 return -EIO;
307 }
308
309 if (SOLO_SDRAM_END(solo_dev) > solo_dev->sdram_size) {
310 dev_err(&solo_dev->pdev->dev,
311 "SDRAM is not large enough (%u < %u)\n",
312 solo_dev->sdram_size, SOLO_SDRAM_END(solo_dev));
313 return -EIO;
314 }
315
316 return 0;
317 }
318