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/aperture.h>
30 #include <linux/module.h>
32 #include <linux/pci.h>
34 #include <drm/clients/drm_client_setup.h>
35 #include <drm/drm_atomic_helper.h>
36 #include <drm/drm_drv.h>
37 #include <drm/drm_fbdev_shmem.h>
38 #include <drm/drm_gem_shmem_helper.h>
39 #include <drm/drm_module.h>
40 #include <drm/drm_probe_helper.h>
44 static int ast_modeset = -1;
46 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
47 module_param_named(modeset, ast_modeset, int, 0400);
53 DEFINE_DRM_GEM_FOPS(ast_fops);
55 static const struct drm_driver ast_driver = {
56 .driver_features = DRIVER_ATOMIC |
63 .major = DRIVER_MAJOR,
64 .minor = DRIVER_MINOR,
65 .patchlevel = DRIVER_PATCHLEVEL,
67 DRM_GEM_SHMEM_DRIVER_OPS,
68 DRM_FBDEV_SHMEM_DRIVER_OPS,
75 #define PCI_VENDOR_ASPEED 0x1a03
77 #define AST_VGA_DEVICE(id, info) { \
78 .class = PCI_BASE_CLASS_DISPLAY << 16, \
79 .class_mask = 0xff0000, \
80 .vendor = PCI_VENDOR_ASPEED, \
82 .subvendor = PCI_ANY_ID, \
83 .subdevice = PCI_ANY_ID, \
84 .driver_data = (unsigned long) info }
86 static const struct pci_device_id ast_pciidlist[] = {
87 AST_VGA_DEVICE(PCI_CHIP_AST2000, NULL),
88 AST_VGA_DEVICE(PCI_CHIP_AST2100, NULL),
92 MODULE_DEVICE_TABLE(pci, ast_pciidlist);
94 static bool ast_is_vga_enabled(void __iomem *ioregs)
96 u8 vgaer = __ast_read8(ioregs, AST_IO_VGAER);
98 return vgaer & AST_IO_VGAER_VGA_ENABLE;
101 static void ast_enable_vga(void __iomem *ioregs)
103 __ast_write8(ioregs, AST_IO_VGAER, AST_IO_VGAER_VGA_ENABLE);
104 __ast_write8(ioregs, AST_IO_VGAMR_W, AST_IO_VGAMR_IOSEL);
108 * Run this function as part of the HW device cleanup; not
109 * when the DRM device gets released.
111 static void ast_enable_mmio_release(void *data)
113 void __iomem *ioregs = (void __force __iomem *)data;
115 /* enable standard VGA decode */
116 __ast_write8_i(ioregs, AST_IO_VGACRI, 0xa1, AST_IO_VGACRA1_MMIO_ENABLED);
119 static int ast_enable_mmio(struct device *dev, void __iomem *ioregs)
121 void *data = (void __force *)ioregs;
123 __ast_write8_i(ioregs, AST_IO_VGACRI, 0xa1,
124 AST_IO_VGACRA1_MMIO_ENABLED |
125 AST_IO_VGACRA1_VGAIO_DISABLED);
127 return devm_add_action_or_reset(dev, ast_enable_mmio_release, data);
130 static void ast_open_key(void __iomem *ioregs)
132 __ast_write8_i(ioregs, AST_IO_VGACRI, 0x80, AST_IO_VGACR80_PASSWORD);
135 static int ast_detect_chip(struct pci_dev *pdev,
136 void __iomem *regs, void __iomem *ioregs,
137 enum ast_chip *chip_out,
138 enum ast_config_mode *config_mode_out)
140 struct device *dev = &pdev->dev;
141 struct device_node *np = dev->of_node;
142 enum ast_config_mode config_mode = ast_use_defaults;
143 uint32_t scu_rev = 0xffffffff;
149 * Find configuration mode and read SCU revision
152 /* Check if we have device-tree properties */
153 if (np && !of_property_read_u32(np, "aspeed,scu-revision-id", &data)) {
154 /* We do, disable P2A access */
155 config_mode = ast_use_dt;
157 } else if (pdev->device == PCI_CHIP_AST2000) { // Not all families have a P2A bridge
159 * The BMC will set SCU 0x40 D[12] to 1 if the P2 bridge
160 * is disabled. We force using P2A if VGA only mode bit
163 vgacrd0 = __ast_read8_i(ioregs, AST_IO_VGACRI, 0xd0);
164 vgacrd1 = __ast_read8_i(ioregs, AST_IO_VGACRI, 0xd1);
165 if (!(vgacrd0 & 0x80) || !(vgacrd1 & 0x10)) {
168 * We have a P2A bridge and it is enabled.
171 /* Patch AST2500/AST2510 */
172 if ((pdev->revision & 0xf0) == 0x40) {
173 if (!(vgacrd0 & AST_VRAM_INIT_STATUS_MASK))
174 ast_patch_ahb_2500(regs);
177 /* Double check that it's actually working */
178 data = __ast_read32(regs, 0xf004);
179 if ((data != 0xffffffff) && (data != 0x00)) {
180 config_mode = ast_use_p2a;
182 /* Read SCU7c (silicon revision register) */
183 __ast_write32(regs, 0xf004, 0x1e6e0000);
184 __ast_write32(regs, 0xf000, 0x1);
185 scu_rev = __ast_read32(regs, 0x1207c);
190 switch (config_mode) {
191 case ast_use_defaults:
192 dev_info(dev, "Using default configuration\n");
195 dev_info(dev, "Using device-tree for configuration\n");
198 dev_info(dev, "Using P2A bridge for configuration\n");
206 if (pdev->revision >= 0x50) {
208 dev_info(dev, "AST 2600 detected\n");
209 } else if (pdev->revision >= 0x40) {
210 switch (scu_rev & 0x300) {
213 dev_info(dev, "AST 2510 detected\n");
217 dev_info(dev, "AST 2500 detected\n");
220 } else if (pdev->revision >= 0x30) {
221 switch (scu_rev & 0x300) {
224 dev_info(dev, "AST 1400 detected\n");
228 dev_info(dev, "AST 2400 detected\n");
231 } else if (pdev->revision >= 0x20) {
232 switch (scu_rev & 0x300) {
235 dev_info(dev, "AST 1300 detected\n");
239 dev_info(dev, "AST 2300 detected\n");
242 } else if (pdev->revision >= 0x10) {
243 switch (scu_rev & 0x0300) {
246 dev_info(dev, "AST 1100 detected\n");
250 dev_info(dev, "AST 2200 detected\n");
254 dev_info(dev, "AST 2150 detected\n");
258 dev_info(dev, "AST 2100 detected\n");
263 dev_info(dev, "AST 2000 detected\n");
267 *config_mode_out = config_mode;
272 static int ast_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
274 struct device *dev = &pdev->dev;
277 void __iomem *ioregs;
278 enum ast_config_mode config_mode;
280 struct drm_device *drm;
281 bool need_post = false;
283 ret = aperture_remove_conflicting_pci_devices(pdev, ast_driver.name);
287 ret = pcim_enable_device(pdev);
291 regs = pcim_iomap_region(pdev, 1, "ast");
293 return PTR_ERR(regs);
295 if (pdev->revision >= 0x40) {
297 * On AST2500 and later models, MMIO is enabled by
298 * default. Adopt it to be compatible with ARM.
300 resource_size_t len = pci_resource_len(pdev, 1);
302 if (len < AST_IO_MM_OFFSET)
304 if ((len - AST_IO_MM_OFFSET) < AST_IO_MM_LENGTH)
306 ioregs = regs + AST_IO_MM_OFFSET;
307 } else if (pci_resource_flags(pdev, 2) & IORESOURCE_IO) {
309 * Map I/O registers if we have a PCI BAR for I/O.
311 resource_size_t len = pci_resource_len(pdev, 2);
313 if (len < AST_IO_MM_LENGTH)
315 ioregs = pcim_iomap_region(pdev, 2, "ast");
317 return PTR_ERR(ioregs);
320 * Anything else is best effort.
322 resource_size_t len = pci_resource_len(pdev, 1);
324 if (len < AST_IO_MM_OFFSET)
326 if ((len - AST_IO_MM_OFFSET) < AST_IO_MM_LENGTH)
328 ioregs = regs + AST_IO_MM_OFFSET;
330 dev_info(dev, "Platform has no I/O space, using MMIO\n");
333 if (!ast_is_vga_enabled(ioregs)) {
334 dev_info(dev, "VGA not enabled on entry, requesting chip POST\n");
339 * If VGA isn't enabled, we need to enable now or subsequent
340 * access to the scratch registers will fail.
343 ast_enable_vga(ioregs);
344 /* Enable extended register access */
345 ast_open_key(ioregs);
347 ret = ast_enable_mmio(dev, ioregs);
351 ret = ast_detect_chip(pdev, regs, ioregs, &chip, &config_mode);
355 drm = ast_device_create(pdev, &ast_driver, chip, config_mode, regs, ioregs, need_post);
358 pci_set_drvdata(pdev, drm);
360 ret = drm_dev_register(drm, ent->driver_data);
364 drm_client_setup(drm, NULL);
369 static void ast_pci_remove(struct pci_dev *pdev)
371 struct drm_device *dev = pci_get_drvdata(pdev);
373 drm_dev_unregister(dev);
374 drm_atomic_helper_shutdown(dev);
377 static void ast_pci_shutdown(struct pci_dev *pdev)
379 drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
382 static int ast_drm_freeze(struct drm_device *dev)
386 error = drm_mode_config_helper_suspend(dev);
389 pci_save_state(to_pci_dev(dev->dev));
393 static int ast_drm_thaw(struct drm_device *dev)
395 struct ast_device *ast = to_ast_device(dev);
397 ast_enable_vga(ast->ioregs);
398 ast_open_key(ast->ioregs);
399 ast_enable_mmio(dev->dev, ast->ioregs);
402 return drm_mode_config_helper_resume(dev);
405 static int ast_drm_resume(struct drm_device *dev)
407 if (pci_enable_device(to_pci_dev(dev->dev)))
410 return ast_drm_thaw(dev);
413 static int ast_pm_suspend(struct device *dev)
415 struct pci_dev *pdev = to_pci_dev(dev);
416 struct drm_device *ddev = pci_get_drvdata(pdev);
419 error = ast_drm_freeze(ddev);
423 pci_disable_device(pdev);
424 pci_set_power_state(pdev, PCI_D3hot);
428 static int ast_pm_resume(struct device *dev)
430 struct pci_dev *pdev = to_pci_dev(dev);
431 struct drm_device *ddev = pci_get_drvdata(pdev);
432 return ast_drm_resume(ddev);
435 static int ast_pm_freeze(struct device *dev)
437 struct pci_dev *pdev = to_pci_dev(dev);
438 struct drm_device *ddev = pci_get_drvdata(pdev);
439 return ast_drm_freeze(ddev);
442 static int ast_pm_thaw(struct device *dev)
444 struct pci_dev *pdev = to_pci_dev(dev);
445 struct drm_device *ddev = pci_get_drvdata(pdev);
446 return ast_drm_thaw(ddev);
449 static int ast_pm_poweroff(struct device *dev)
451 struct pci_dev *pdev = to_pci_dev(dev);
452 struct drm_device *ddev = pci_get_drvdata(pdev);
454 return ast_drm_freeze(ddev);
457 static const struct dev_pm_ops ast_pm_ops = {
458 .suspend = ast_pm_suspend,
459 .resume = ast_pm_resume,
460 .freeze = ast_pm_freeze,
462 .poweroff = ast_pm_poweroff,
463 .restore = ast_pm_resume,
466 static struct pci_driver ast_pci_driver = {
468 .id_table = ast_pciidlist,
469 .probe = ast_pci_probe,
470 .remove = ast_pci_remove,
471 .shutdown = ast_pci_shutdown,
472 .driver.pm = &ast_pm_ops,
475 drm_module_pci_driver_if_modeset(ast_pci_driver, ast_modeset);
477 MODULE_AUTHOR(DRIVER_AUTHOR);
478 MODULE_DESCRIPTION(DRIVER_DESC);
479 MODULE_LICENSE("GPL and additional rights");