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 | |
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(dev: &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!! */ |
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(v: &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(x: &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), data: desc_dma); |
83 | solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(p2m_id), data: desc_cnt); |
84 | solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), data: 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 | data: desc[1].dma_addr); |
94 | solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(p2m_id), |
95 | data: desc[1].ext_addr); |
96 | solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(p2m_id), |
97 | data: desc[1].cfg); |
98 | solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id), |
99 | data: desc[1].ctrl); |
100 | } |
101 | |
102 | timeout = wait_for_completion_timeout(x: &p2m_dev->completion, |
103 | timeout: 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), data: 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), data: config); |
118 | |
119 | mutex_unlock(lock: &p2m_dev->mutex); |
120 | |
121 | return ret; |
122 | } |
123 | |
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 | |
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: &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, desc_dma: 0, desc_cnt: 1); |
156 | } |
157 | |
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), data: 0); |
173 | solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(id), data: desc->dma_addr); |
174 | solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(id), data: desc->ext_addr); |
175 | solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(id), data: desc->cfg); |
176 | solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), data: desc->ctrl); |
177 | } |
178 | |
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), data: 0); |
192 | complete(&p2m_dev->completion); |
193 | } |
194 | } |
195 | |
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(dev: solo_dev, SOLO_IRQ_P2M(i)); |
202 | } |
203 | |
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(addr: (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, wr: 1, sys_addr: wr_buf, ext_addr: base, size, repeat: 0, ext_size: 0)) |
231 | goto test_fail; |
232 | |
233 | if (solo_p2m_dma(solo_dev, wr: 0, sys_addr: rd_buf, ext_addr: base, size, repeat: 0, ext_size: 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(addr: (unsigned long)wr_buf, order); |
245 | free_pages(addr: (unsigned long)rd_buf, order); |
246 | |
247 | return ret; |
248 | } |
249 | |
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(x: &p2m_dev->completion); |
260 | |
261 | solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), data: 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(dev: 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, data: solo_dev->sys_config | |
280 | SOLO_SYS_CFG_RESET); |
281 | solo_reg_write(solo_dev, SOLO_SYS_CFG, data: solo_dev->sys_config); |
282 | |
283 | switch (i) { |
284 | case 2: |
285 | if (solo_p2m_test(solo_dev, base: 0x07ff0000, size: 0x00010000) || |
286 | solo_p2m_test(solo_dev, base: 0x05ff0000, size: 0x00010000)) |
287 | continue; |
288 | break; |
289 | |
290 | case 1: |
291 | if (solo_p2m_test(solo_dev, base: 0x03ff0000, size: 0x00010000)) |
292 | continue; |
293 | break; |
294 | |
295 | default: |
296 | if (solo_p2m_test(solo_dev, base: 0x01ff0000, size: 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 | |