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1/*
2 * Copyright 2012 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sub license, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
18 * USE OR OTHER DEALINGS IN THE SOFTWARE.
19 *
20 * The above copyright notice and this permission notice (including the
21 * next paragraph) shall be included in all copies or substantial portions
22 * of the Software.
23 *
24 */
25/*
26 * Authors: Dave Airlie <airlied@redhat.com>
27 */
28
29#include <linux/pci.h>
30
31#include <drm/drm_atomic_helper.h>
32#include <drm/drm_crtc_helper.h>
33#include <drm/drm_drv.h>
34#include <drm/drm_gem.h>
35#include <drm/drm_gem_vram_helper.h>
36#include <drm/drm_managed.h>
37
38#include "ast_drv.h"
39
40void ast_set_index_reg_mask(struct ast_private *ast,
41 uint32_t base, uint8_t index,
42 uint8_t mask, uint8_t val)
43{
44 u8 tmp;
45 ast_io_write8(ast, base, index);
46 tmp = (ast_io_read8(ast, base + 1) & mask) | val;
47 ast_set_index_reg(ast, base, index, tmp);
48}
49
50uint8_t ast_get_index_reg(struct ast_private *ast,
51 uint32_t base, uint8_t index)
52{
53 uint8_t ret;
54 ast_io_write8(ast, base, index);
55 ret = ast_io_read8(ast, base + 1);
56 return ret;
57}
58
59uint8_t ast_get_index_reg_mask(struct ast_private *ast,
60 uint32_t base, uint8_t index, uint8_t mask)
61{
62 uint8_t ret;
63 ast_io_write8(ast, base, index);
64 ret = ast_io_read8(ast, base + 1) & mask;
65 return ret;
66}
67
68static void ast_detect_config_mode(struct drm_device *dev, u32 *scu_rev)
69{
70 struct device_node *np = dev->dev->of_node;
71 struct ast_private *ast = to_ast_private(dev);
72 struct pci_dev *pdev = to_pci_dev(dev->dev);
73 uint32_t data, jregd0, jregd1;
74
75 /* Defaults */
76 ast->config_mode = ast_use_defaults;
77 *scu_rev = 0xffffffff;
78
79 /* Check if we have device-tree properties */
80 if (np && !of_property_read_u32(np, "aspeed,scu-revision-id",
81 scu_rev)) {
82 /* We do, disable P2A access */
83 ast->config_mode = ast_use_dt;
84 drm_info(dev, "Using device-tree for configuration\n");
85 return;
86 }
87
88 /* Not all families have a P2A bridge */
89 if (pdev->device != PCI_CHIP_AST2000)
90 return;
91
92 /*
93 * The BMC will set SCU 0x40 D[12] to 1 if the P2 bridge
94 * is disabled. We force using P2A if VGA only mode bit
95 * is set D[7]
96 */
97 jregd0 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
98 jregd1 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
99 if (!(jregd0 & 0x80) || !(jregd1 & 0x10)) {
100 /* Patch AST2500 */
101 if (((pdev->revision & 0xF0) == 0x40)
102 && ((jregd0 & AST_VRAM_INIT_STATUS_MASK) == 0))
103 ast_patch_ahb_2500(ast);
104
105 /* Double check it's actually working */
106 data = ast_read32(ast, 0xf004);
107 if ((data != 0xFFFFFFFF) && (data != 0x00)) {
108 /* P2A works, grab silicon revision */
109 ast->config_mode = ast_use_p2a;
110
111 drm_info(dev, "Using P2A bridge for configuration\n");
112
113 /* Read SCU7c (silicon revision register) */
114 ast_write32(ast, 0xf004, 0x1e6e0000);
115 ast_write32(ast, 0xf000, 0x1);
116 *scu_rev = ast_read32(ast, 0x1207c);
117 return;
118 }
119 }
120
121 /* We have a P2A bridge but it's disabled */
122 drm_info(dev, "P2A bridge disabled, using default configuration\n");
123}
124
125static int ast_detect_chip(struct drm_device *dev, bool *need_post)
126{
127 struct ast_private *ast = to_ast_private(dev);
128 struct pci_dev *pdev = to_pci_dev(dev->dev);
129 uint32_t jreg, scu_rev;
130
131 /*
132 * If VGA isn't enabled, we need to enable now or subsequent
133 * access to the scratch registers will fail. We also inform
134 * our caller that it needs to POST the chip
135 * (Assumption: VGA not enabled -> need to POST)
136 */
137 if (!ast_is_vga_enabled(dev)) {
138 ast_enable_vga(dev);
139 drm_info(dev, "VGA not enabled on entry, requesting chip POST\n");
140 *need_post = true;
141 } else
142 *need_post = false;
143
144
145 /* Enable extended register access */
146 ast_open_key(ast);
147 ast_enable_mmio(dev);
148
149 /* Find out whether P2A works or whether to use device-tree */
150 ast_detect_config_mode(dev, &scu_rev);
151
152 /* Identify chipset */
153 if (pdev->revision >= 0x50) {
154 ast->chip = AST2600;
155 drm_info(dev, "AST 2600 detected\n");
156 } else if (pdev->revision >= 0x40) {
157 ast->chip = AST2500;
158 drm_info(dev, "AST 2500 detected\n");
159 } else if (pdev->revision >= 0x30) {
160 ast->chip = AST2400;
161 drm_info(dev, "AST 2400 detected\n");
162 } else if (pdev->revision >= 0x20) {
163 ast->chip = AST2300;
164 drm_info(dev, "AST 2300 detected\n");
165 } else if (pdev->revision >= 0x10) {
166 switch (scu_rev & 0x0300) {
167 case 0x0200:
168 ast->chip = AST1100;
169 drm_info(dev, "AST 1100 detected\n");
170 break;
171 case 0x0100:
172 ast->chip = AST2200;
173 drm_info(dev, "AST 2200 detected\n");
174 break;
175 case 0x0000:
176 ast->chip = AST2150;
177 drm_info(dev, "AST 2150 detected\n");
178 break;
179 default:
180 ast->chip = AST2100;
181 drm_info(dev, "AST 2100 detected\n");
182 break;
183 }
184 ast->vga2_clone = false;
185 } else {
186 ast->chip = AST2000;
187 drm_info(dev, "AST 2000 detected\n");
188 }
189
190 /* Check if we support wide screen */
191 switch (ast->chip) {
192 case AST2000:
193 ast->support_wide_screen = false;
194 break;
195 default:
196 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
197 if (!(jreg & 0x80))
198 ast->support_wide_screen = true;
199 else if (jreg & 0x01)
200 ast->support_wide_screen = true;
201 else {
202 ast->support_wide_screen = false;
203 if (ast->chip == AST2300 &&
204 (scu_rev & 0x300) == 0x0) /* ast1300 */
205 ast->support_wide_screen = true;
206 if (ast->chip == AST2400 &&
207 (scu_rev & 0x300) == 0x100) /* ast1400 */
208 ast->support_wide_screen = true;
209 if (ast->chip == AST2500 &&
210 scu_rev == 0x100) /* ast2510 */
211 ast->support_wide_screen = true;
212 }
213 break;
214 }
215
216 /* Check 3rd Tx option (digital output afaik) */
217 ast->tx_chip_type = AST_TX_NONE;
218
219 /*
220 * VGACRA3 Enhanced Color Mode Register, check if DVO is already
221 * enabled, in that case, assume we have a SIL164 TMDS transmitter
222 *
223 * Don't make that assumption if we the chip wasn't enabled and
224 * is at power-on reset, otherwise we'll incorrectly "detect" a
225 * SIL164 when there is none.
226 */
227 if (!*need_post) {
228 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa3, 0xff);
229 if (jreg & 0x80)
230 ast->tx_chip_type = AST_TX_SIL164;
231 }
232
233 if ((ast->chip == AST2300) || (ast->chip == AST2400)) {
234 /*
235 * On AST2300 and 2400, look the configuration set by the SoC in
236 * the SOC scratch register #1 bits 11:8 (interestingly marked
237 * as "reserved" in the spec)
238 */
239 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
240 switch (jreg) {
241 case 0x04:
242 ast->tx_chip_type = AST_TX_SIL164;
243 break;
244 case 0x08:
245 ast->dp501_fw_addr = drmm_kzalloc(dev, 32*1024, GFP_KERNEL);
246 if (ast->dp501_fw_addr) {
247 /* backup firmware */
248 if (ast_backup_fw(dev, ast->dp501_fw_addr, 32*1024)) {
249 drmm_kfree(dev, ast->dp501_fw_addr);
250 ast->dp501_fw_addr = NULL;
251 }
252 }
253 fallthrough;
254 case 0x0c:
255 ast->tx_chip_type = AST_TX_DP501;
256 }
257 }
258
259 /* Print stuff for diagnostic purposes */
260 switch(ast->tx_chip_type) {
261 case AST_TX_SIL164:
262 drm_info(dev, "Using Sil164 TMDS transmitter\n");
263 break;
264 case AST_TX_DP501:
265 drm_info(dev, "Using DP501 DisplayPort transmitter\n");
266 break;
267 default:
268 drm_info(dev, "Analog VGA only\n");
269 }
270 return 0;
271}
272
273static int ast_get_dram_info(struct drm_device *dev)
274{
275 struct device_node *np = dev->dev->of_node;
276 struct ast_private *ast = to_ast_private(dev);
277 uint32_t mcr_cfg, mcr_scu_mpll, mcr_scu_strap;
278 uint32_t denum, num, div, ref_pll, dsel;
279
280 switch (ast->config_mode) {
281 case ast_use_dt:
282 /*
283 * If some properties are missing, use reasonable
284 * defaults for AST2400
285 */
286 if (of_property_read_u32(np, "aspeed,mcr-configuration",
287 &mcr_cfg))
288 mcr_cfg = 0x00000577;
289 if (of_property_read_u32(np, "aspeed,mcr-scu-mpll",
290 &mcr_scu_mpll))
291 mcr_scu_mpll = 0x000050C0;
292 if (of_property_read_u32(np, "aspeed,mcr-scu-strap",
293 &mcr_scu_strap))
294 mcr_scu_strap = 0;
295 break;
296 case ast_use_p2a:
297 ast_write32(ast, 0xf004, 0x1e6e0000);
298 ast_write32(ast, 0xf000, 0x1);
299 mcr_cfg = ast_read32(ast, 0x10004);
300 mcr_scu_mpll = ast_read32(ast, 0x10120);
301 mcr_scu_strap = ast_read32(ast, 0x10170);
302 break;
303 case ast_use_defaults:
304 default:
305 ast->dram_bus_width = 16;
306 ast->dram_type = AST_DRAM_1Gx16;
307 if (ast->chip == AST2500)
308 ast->mclk = 800;
309 else
310 ast->mclk = 396;
311 return 0;
312 }
313
314 if (mcr_cfg & 0x40)
315 ast->dram_bus_width = 16;
316 else
317 ast->dram_bus_width = 32;
318
319 if (ast->chip == AST2500) {
320 switch (mcr_cfg & 0x03) {
321 case 0:
322 ast->dram_type = AST_DRAM_1Gx16;
323 break;
324 default:
325 case 1:
326 ast->dram_type = AST_DRAM_2Gx16;
327 break;
328 case 2:
329 ast->dram_type = AST_DRAM_4Gx16;
330 break;
331 case 3:
332 ast->dram_type = AST_DRAM_8Gx16;
333 break;
334 }
335 } else if (ast->chip == AST2300 || ast->chip == AST2400) {
336 switch (mcr_cfg & 0x03) {
337 case 0:
338 ast->dram_type = AST_DRAM_512Mx16;
339 break;
340 default:
341 case 1:
342 ast->dram_type = AST_DRAM_1Gx16;
343 break;
344 case 2:
345 ast->dram_type = AST_DRAM_2Gx16;
346 break;
347 case 3:
348 ast->dram_type = AST_DRAM_4Gx16;
349 break;
350 }
351 } else {
352 switch (mcr_cfg & 0x0c) {
353 case 0:
354 case 4:
355 ast->dram_type = AST_DRAM_512Mx16;
356 break;
357 case 8:
358 if (mcr_cfg & 0x40)
359 ast->dram_type = AST_DRAM_1Gx16;
360 else
361 ast->dram_type = AST_DRAM_512Mx32;
362 break;
363 case 0xc:
364 ast->dram_type = AST_DRAM_1Gx32;
365 break;
366 }
367 }
368
369 if (mcr_scu_strap & 0x2000)
370 ref_pll = 14318;
371 else
372 ref_pll = 12000;
373
374 denum = mcr_scu_mpll & 0x1f;
375 num = (mcr_scu_mpll & 0x3fe0) >> 5;
376 dsel = (mcr_scu_mpll & 0xc000) >> 14;
377 switch (dsel) {
378 case 3:
379 div = 0x4;
380 break;
381 case 2:
382 case 1:
383 div = 0x2;
384 break;
385 default:
386 div = 0x1;
387 break;
388 }
389 ast->mclk = ref_pll * (num + 2) / ((denum + 2) * (div * 1000));
390 return 0;
391}
392
393/*
394 * Run this function as part of the HW device cleanup; not
395 * when the DRM device gets released.
396 */
397static void ast_device_release(void *data)
398{
399 struct ast_private *ast = data;
400
401 /* enable standard VGA decode */
402 ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x04);
403}
404
405struct ast_private *ast_device_create(const struct drm_driver *drv,
406 struct pci_dev *pdev,
407 unsigned long flags)
408{
409 struct drm_device *dev;
410 struct ast_private *ast;
411 bool need_post;
412 int ret = 0;
413
414 ast = devm_drm_dev_alloc(&pdev->dev, drv, struct ast_private, base);
415 if (IS_ERR(ast))
416 return ast;
417 dev = &ast->base;
418
419 pci_set_drvdata(pdev, dev);
420
421 ast->regs = pcim_iomap(pdev, 1, 0);
422 if (!ast->regs)
423 return ERR_PTR(-EIO);
424
425 /*
426 * If we don't have IO space at all, use MMIO now and
427 * assume the chip has MMIO enabled by default (rev 0x20
428 * and higher).
429 */
430 if (!(pci_resource_flags(pdev, 2) & IORESOURCE_IO)) {
431 drm_info(dev, "platform has no IO space, trying MMIO\n");
432 ast->ioregs = ast->regs + AST_IO_MM_OFFSET;
433 }
434
435 /* "map" IO regs if the above hasn't done so already */
436 if (!ast->ioregs) {
437 ast->ioregs = pcim_iomap(pdev, 2, 0);
438 if (!ast->ioregs)
439 return ERR_PTR(-EIO);
440 }
441
442 ast_detect_chip(dev, &need_post);
443
444 ret = ast_get_dram_info(dev);
445 if (ret)
446 return ERR_PTR(ret);
447
448 drm_info(dev, "dram MCLK=%u Mhz type=%d bus_width=%d\n",
449 ast->mclk, ast->dram_type, ast->dram_bus_width);
450
451 if (need_post)
452 ast_post_gpu(dev);
453
454 ret = ast_mm_init(ast);
455 if (ret)
456 return ERR_PTR(ret);
457
458 /* map reserved buffer */
459 ast->dp501_fw_buf = NULL;
460 if (dev->vram_mm->vram_size < pci_resource_len(pdev, 0)) {
461 ast->dp501_fw_buf = pci_iomap_range(pdev, 0, dev->vram_mm->vram_size, 0);
462 if (!ast->dp501_fw_buf)
463 drm_info(dev, "failed to map reserved buffer!\n");
464 }
465
466 ret = ast_mode_config_init(ast);
467 if (ret)
468 return ERR_PTR(ret);
469
470 ret = devm_add_action_or_reset(dev->dev, ast_device_release, ast);
471 if (ret)
472 return ERR_PTR(ret);
473
474 return ast;
475}