2 * Copyright 2012 Red Hat Inc.
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:
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.
20 * The above copyright notice and this permission notice (including the
21 * next paragraph) shall be included in all copies or substantial portions
29 #include <linux/module.h>
31 #include <linux/pci.h>
33 #include <drm/drm_aperture.h>
34 #include <drm/drm_atomic_helper.h>
35 #include <drm/drm_drv.h>
36 #include <drm/drm_fbdev_shmem.h>
37 #include <drm/drm_gem_shmem_helper.h>
38 #include <drm/drm_module.h>
39 #include <drm/drm_probe_helper.h>
43 static int ast_modeset = -1;
45 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
46 module_param_named(modeset, ast_modeset, int, 0400);
52 DEFINE_DRM_GEM_FOPS(ast_fops);
54 static const struct drm_driver ast_driver = {
55 .driver_features = DRIVER_ATOMIC |
63 .major = DRIVER_MAJOR,
64 .minor = DRIVER_MINOR,
65 .patchlevel = DRIVER_PATCHLEVEL,
67 DRM_GEM_SHMEM_DRIVER_OPS
74 #define PCI_VENDOR_ASPEED 0x1a03
76 #define AST_VGA_DEVICE(id, info) { \
77 .class = PCI_BASE_CLASS_DISPLAY << 16, \
78 .class_mask = 0xff0000, \
79 .vendor = PCI_VENDOR_ASPEED, \
81 .subvendor = PCI_ANY_ID, \
82 .subdevice = PCI_ANY_ID, \
83 .driver_data = (unsigned long) info }
85 static const struct pci_device_id ast_pciidlist[] = {
86 AST_VGA_DEVICE(PCI_CHIP_AST2000, NULL),
87 AST_VGA_DEVICE(PCI_CHIP_AST2100, NULL),
91 MODULE_DEVICE_TABLE(pci, ast_pciidlist);
93 static bool ast_is_vga_enabled(void __iomem *ioregs)
95 u8 vgaer = __ast_read8(ioregs, AST_IO_VGAER);
97 return vgaer & AST_IO_VGAER_VGA_ENABLE;
100 static void ast_enable_vga(void __iomem *ioregs)
102 __ast_write8(ioregs, AST_IO_VGAER, AST_IO_VGAER_VGA_ENABLE);
103 __ast_write8(ioregs, AST_IO_VGAMR_W, AST_IO_VGAMR_IOSEL);
107 * Run this function as part of the HW device cleanup; not
108 * when the DRM device gets released.
110 static void ast_enable_mmio_release(void *data)
112 void __iomem *ioregs = (void __force __iomem *)data;
114 /* enable standard VGA decode */
115 __ast_write8_i(ioregs, AST_IO_VGACRI, 0xa1, AST_IO_VGACRA1_MMIO_ENABLED);
118 static int ast_enable_mmio(struct device *dev, void __iomem *ioregs)
120 void *data = (void __force *)ioregs;
122 __ast_write8_i(ioregs, AST_IO_VGACRI, 0xa1,
123 AST_IO_VGACRA1_MMIO_ENABLED |
124 AST_IO_VGACRA1_VGAIO_DISABLED);
126 return devm_add_action_or_reset(dev, ast_enable_mmio_release, data);
129 static void ast_open_key(void __iomem *ioregs)
131 __ast_write8_i(ioregs, AST_IO_VGACRI, 0x80, AST_IO_VGACR80_PASSWORD);
134 static int ast_detect_chip(struct pci_dev *pdev,
135 void __iomem *regs, void __iomem *ioregs,
136 enum ast_chip *chip_out,
137 enum ast_config_mode *config_mode_out)
139 struct device *dev = &pdev->dev;
140 struct device_node *np = dev->of_node;
141 enum ast_config_mode config_mode = ast_use_defaults;
142 uint32_t scu_rev = 0xffffffff;
148 * Find configuration mode and read SCU revision
151 /* Check if we have device-tree properties */
152 if (np && !of_property_read_u32(np, "aspeed,scu-revision-id", &data)) {
153 /* We do, disable P2A access */
154 config_mode = ast_use_dt;
156 } else if (pdev->device == PCI_CHIP_AST2000) { // Not all families have a P2A bridge
158 * The BMC will set SCU 0x40 D[12] to 1 if the P2 bridge
159 * is disabled. We force using P2A if VGA only mode bit
162 vgacrd0 = __ast_read8_i(ioregs, AST_IO_VGACRI, 0xd0);
163 vgacrd1 = __ast_read8_i(ioregs, AST_IO_VGACRI, 0xd1);
164 if (!(vgacrd0 & 0x80) || !(vgacrd1 & 0x10)) {
167 * We have a P2A bridge and it is enabled.
170 /* Patch AST2500/AST2510 */
171 if ((pdev->revision & 0xf0) == 0x40) {
172 if (!(vgacrd0 & AST_VRAM_INIT_STATUS_MASK))
173 ast_patch_ahb_2500(regs);
176 /* Double check that it's actually working */
177 data = __ast_read32(regs, 0xf004);
178 if ((data != 0xffffffff) && (data != 0x00)) {
179 config_mode = ast_use_p2a;
181 /* Read SCU7c (silicon revision register) */
182 __ast_write32(regs, 0xf004, 0x1e6e0000);
183 __ast_write32(regs, 0xf000, 0x1);
184 scu_rev = __ast_read32(regs, 0x1207c);
189 switch (config_mode) {
190 case ast_use_defaults:
191 dev_info(dev, "Using default configuration\n");
194 dev_info(dev, "Using device-tree for configuration\n");
197 dev_info(dev, "Using P2A bridge for configuration\n");
205 if (pdev->revision >= 0x50) {
207 dev_info(dev, "AST 2600 detected\n");
208 } else if (pdev->revision >= 0x40) {
209 switch (scu_rev & 0x300) {
212 dev_info(dev, "AST 2510 detected\n");
216 dev_info(dev, "AST 2500 detected\n");
219 } else if (pdev->revision >= 0x30) {
220 switch (scu_rev & 0x300) {
223 dev_info(dev, "AST 1400 detected\n");
227 dev_info(dev, "AST 2400 detected\n");
230 } else if (pdev->revision >= 0x20) {
231 switch (scu_rev & 0x300) {
234 dev_info(dev, "AST 1300 detected\n");
238 dev_info(dev, "AST 2300 detected\n");
241 } else if (pdev->revision >= 0x10) {
242 switch (scu_rev & 0x0300) {
245 dev_info(dev, "AST 1100 detected\n");
249 dev_info(dev, "AST 2200 detected\n");
253 dev_info(dev, "AST 2150 detected\n");
257 dev_info(dev, "AST 2100 detected\n");
262 dev_info(dev, "AST 2000 detected\n");
266 *config_mode_out = config_mode;
271 static int ast_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
273 struct device *dev = &pdev->dev;
276 void __iomem *ioregs;
277 enum ast_config_mode config_mode;
279 struct drm_device *drm;
280 bool need_post = false;
282 ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &ast_driver);
286 ret = pcim_enable_device(pdev);
290 regs = pcim_iomap(pdev, 1, 0);
294 if (pdev->revision >= 0x40) {
296 * On AST2500 and later models, MMIO is enabled by
297 * default. Adopt it to be compatible with ARM.
299 resource_size_t len = pci_resource_len(pdev, 1);
301 if (len < AST_IO_MM_OFFSET)
303 if ((len - AST_IO_MM_OFFSET) < AST_IO_MM_LENGTH)
305 ioregs = regs + AST_IO_MM_OFFSET;
306 } else if (pci_resource_flags(pdev, 2) & IORESOURCE_IO) {
308 * Map I/O registers if we have a PCI BAR for I/O.
310 resource_size_t len = pci_resource_len(pdev, 2);
312 if (len < AST_IO_MM_LENGTH)
314 ioregs = pcim_iomap(pdev, 2, 0);
319 * Anything else is best effort.
321 resource_size_t len = pci_resource_len(pdev, 1);
323 if (len < AST_IO_MM_OFFSET)
325 if ((len - AST_IO_MM_OFFSET) < AST_IO_MM_LENGTH)
327 ioregs = regs + AST_IO_MM_OFFSET;
329 dev_info(dev, "Platform has no I/O space, using MMIO\n");
332 if (!ast_is_vga_enabled(ioregs)) {
333 dev_info(dev, "VGA not enabled on entry, requesting chip POST\n");
338 * If VGA isn't enabled, we need to enable now or subsequent
339 * access to the scratch registers will fail.
342 ast_enable_vga(ioregs);
343 /* Enable extended register access */
344 ast_open_key(ioregs);
346 ret = ast_enable_mmio(dev, ioregs);
350 ret = ast_detect_chip(pdev, regs, ioregs, &chip, &config_mode);
354 drm = ast_device_create(pdev, &ast_driver, chip, config_mode, regs, ioregs, need_post);
357 pci_set_drvdata(pdev, drm);
359 ret = drm_dev_register(drm, ent->driver_data);
363 drm_fbdev_shmem_setup(drm, 32);
368 static void ast_pci_remove(struct pci_dev *pdev)
370 struct drm_device *dev = pci_get_drvdata(pdev);
372 drm_dev_unregister(dev);
373 drm_atomic_helper_shutdown(dev);
376 static void ast_pci_shutdown(struct pci_dev *pdev)
378 drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
381 static int ast_drm_freeze(struct drm_device *dev)
385 error = drm_mode_config_helper_suspend(dev);
388 pci_save_state(to_pci_dev(dev->dev));
392 static int ast_drm_thaw(struct drm_device *dev)
396 return drm_mode_config_helper_resume(dev);
399 static int ast_drm_resume(struct drm_device *dev)
401 if (pci_enable_device(to_pci_dev(dev->dev)))
404 return ast_drm_thaw(dev);
407 static int ast_pm_suspend(struct device *dev)
409 struct pci_dev *pdev = to_pci_dev(dev);
410 struct drm_device *ddev = pci_get_drvdata(pdev);
413 error = ast_drm_freeze(ddev);
417 pci_disable_device(pdev);
418 pci_set_power_state(pdev, PCI_D3hot);
422 static int ast_pm_resume(struct device *dev)
424 struct pci_dev *pdev = to_pci_dev(dev);
425 struct drm_device *ddev = pci_get_drvdata(pdev);
426 return ast_drm_resume(ddev);
429 static int ast_pm_freeze(struct device *dev)
431 struct pci_dev *pdev = to_pci_dev(dev);
432 struct drm_device *ddev = pci_get_drvdata(pdev);
433 return ast_drm_freeze(ddev);
436 static int ast_pm_thaw(struct device *dev)
438 struct pci_dev *pdev = to_pci_dev(dev);
439 struct drm_device *ddev = pci_get_drvdata(pdev);
440 return ast_drm_thaw(ddev);
443 static int ast_pm_poweroff(struct device *dev)
445 struct pci_dev *pdev = to_pci_dev(dev);
446 struct drm_device *ddev = pci_get_drvdata(pdev);
448 return ast_drm_freeze(ddev);
451 static const struct dev_pm_ops ast_pm_ops = {
452 .suspend = ast_pm_suspend,
453 .resume = ast_pm_resume,
454 .freeze = ast_pm_freeze,
456 .poweroff = ast_pm_poweroff,
457 .restore = ast_pm_resume,
460 static struct pci_driver ast_pci_driver = {
462 .id_table = ast_pciidlist,
463 .probe = ast_pci_probe,
464 .remove = ast_pci_remove,
465 .shutdown = ast_pci_shutdown,
466 .driver.pm = &ast_pm_ops,
469 drm_module_pci_driver_if_modeset(ast_pci_driver, ast_modeset);
471 MODULE_AUTHOR(DRIVER_AUTHOR);
472 MODULE_DESCRIPTION(DRIVER_DESC);
473 MODULE_LICENSE("GPL and additional rights");