Loading...
1// SPDX-License-Identifier: GPL-2.0+
2// Copyright 2018 IBM Corporation
3
4#include <linux/clk.h>
5#include <linux/dma-mapping.h>
6#include <linux/irq.h>
7#include <linux/mfd/syscon.h>
8#include <linux/module.h>
9#include <linux/mod_devicetable.h>
10#include <linux/of_reserved_mem.h>
11#include <linux/platform_device.h>
12#include <linux/property.h>
13#include <linux/regmap.h>
14#include <linux/reset.h>
15
16#include <drm/drm_atomic_helper.h>
17#include <drm/drm_client_setup.h>
18#include <drm/drm_device.h>
19#include <drm/drm_fbdev_dma.h>
20#include <drm/drm_gem_dma_helper.h>
21#include <drm/drm_gem_framebuffer_helper.h>
22#include <drm/drm_module.h>
23#include <drm/drm_probe_helper.h>
24#include <drm/drm_simple_kms_helper.h>
25#include <drm/drm_vblank.h>
26#include <drm/drm_drv.h>
27
28#include "aspeed_gfx.h"
29
30/**
31 * DOC: ASPEED GFX Driver
32 *
33 * This driver is for the ASPEED BMC SoC's 'GFX' display hardware, also called
34 * the 'SOC Display Controller' in the datasheet. This driver runs on the ARM
35 * based BMC systems, unlike the ast driver which runs on a host CPU and is for
36 * a PCIe graphics device.
37 *
38 * The AST2500 supports a total of 3 output paths:
39 *
40 * 1. VGA output, the output target can choose either or both to the DAC
41 * or DVO interface.
42 *
43 * 2. Graphics CRT output, the output target can choose either or both to
44 * the DAC or DVO interface.
45 *
46 * 3. Video input from DVO, the video input can be used for video engine
47 * capture or DAC display output.
48 *
49 * Output options are selected in SCU2C.
50 *
51 * The "VGA mode" device is the PCI attached controller. The "Graphics CRT"
52 * is the ARM's internal display controller.
53 *
54 * The driver only supports a simple configuration consisting of a 40MHz
55 * pixel clock, fixed by hardware limitations, and the VGA output path.
56 *
57 * The driver was written with the 'AST2500 Software Programming Guide' v17,
58 * which is available under NDA from ASPEED.
59 */
60
61struct aspeed_gfx_config {
62 u32 dac_reg; /* DAC register in SCU */
63 u32 int_clear_reg; /* Interrupt clear register */
64 u32 vga_scratch_reg; /* VGA scratch register in SCU */
65 u32 throd_val; /* Default Threshold Seting */
66 u32 scan_line_max; /* Max memory size of one scan line */
67};
68
69static const struct aspeed_gfx_config ast2400_config = {
70 .dac_reg = 0x2c,
71 .int_clear_reg = 0x60,
72 .vga_scratch_reg = 0x50,
73 .throd_val = CRT_THROD_LOW(0x1e) | CRT_THROD_HIGH(0x12),
74 .scan_line_max = 64,
75};
76
77static const struct aspeed_gfx_config ast2500_config = {
78 .dac_reg = 0x2c,
79 .int_clear_reg = 0x60,
80 .vga_scratch_reg = 0x50,
81 .throd_val = CRT_THROD_LOW(0x24) | CRT_THROD_HIGH(0x3c),
82 .scan_line_max = 128,
83};
84
85static const struct aspeed_gfx_config ast2600_config = {
86 .dac_reg = 0xc0,
87 .int_clear_reg = 0x68,
88 .vga_scratch_reg = 0x50,
89 .throd_val = CRT_THROD_LOW(0x50) | CRT_THROD_HIGH(0x70),
90 .scan_line_max = 128,
91};
92
93static const struct of_device_id aspeed_gfx_match[] = {
94 { .compatible = "aspeed,ast2400-gfx", .data = &ast2400_config },
95 { .compatible = "aspeed,ast2500-gfx", .data = &ast2500_config },
96 { .compatible = "aspeed,ast2600-gfx", .data = &ast2600_config },
97 { },
98};
99MODULE_DEVICE_TABLE(of, aspeed_gfx_match);
100
101static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = {
102 .fb_create = drm_gem_fb_create,
103 .atomic_check = drm_atomic_helper_check,
104 .atomic_commit = drm_atomic_helper_commit,
105};
106
107static int aspeed_gfx_setup_mode_config(struct drm_device *drm)
108{
109 int ret;
110
111 ret = drmm_mode_config_init(drm);
112 if (ret)
113 return ret;
114
115 drm->mode_config.min_width = 0;
116 drm->mode_config.min_height = 0;
117 drm->mode_config.max_width = 800;
118 drm->mode_config.max_height = 600;
119 drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs;
120
121 return ret;
122}
123
124static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data)
125{
126 struct drm_device *drm = data;
127 struct aspeed_gfx *priv = to_aspeed_gfx(drm);
128 u32 reg;
129
130 reg = readl(priv->base + CRT_CTRL1);
131
132 if (reg & CRT_CTRL_VERTICAL_INTR_STS) {
133 drm_crtc_handle_vblank(&priv->pipe.crtc);
134 writel(reg, priv->base + priv->int_clr_reg);
135 return IRQ_HANDLED;
136 }
137
138 return IRQ_NONE;
139}
140
141static int aspeed_gfx_load(struct drm_device *drm)
142{
143 struct platform_device *pdev = to_platform_device(drm->dev);
144 struct aspeed_gfx *priv = to_aspeed_gfx(drm);
145 struct device_node *np = pdev->dev.of_node;
146 const struct aspeed_gfx_config *config;
147 struct resource *res;
148 int ret;
149
150 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
151 priv->base = devm_ioremap_resource(drm->dev, res);
152 if (IS_ERR(priv->base))
153 return PTR_ERR(priv->base);
154
155 config = device_get_match_data(&pdev->dev);
156 if (!config)
157 return -EINVAL;
158
159 priv->dac_reg = config->dac_reg;
160 priv->int_clr_reg = config->int_clear_reg;
161 priv->vga_scratch_reg = config->vga_scratch_reg;
162 priv->throd_val = config->throd_val;
163 priv->scan_line_max = config->scan_line_max;
164
165 priv->scu = syscon_regmap_lookup_by_phandle(np, "syscon");
166 if (IS_ERR(priv->scu)) {
167 priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu");
168 if (IS_ERR(priv->scu)) {
169 dev_err(&pdev->dev, "failed to find SCU regmap\n");
170 return PTR_ERR(priv->scu);
171 }
172 }
173
174 ret = of_reserved_mem_device_init(drm->dev);
175 if (ret) {
176 dev_err(&pdev->dev,
177 "failed to initialize reserved mem: %d\n", ret);
178 return ret;
179 }
180
181 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
182 if (ret) {
183 dev_err(&pdev->dev, "failed to set DMA mask: %d\n", ret);
184 return ret;
185 }
186
187 priv->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
188 if (IS_ERR(priv->rst)) {
189 dev_err(&pdev->dev,
190 "missing or invalid reset controller device tree entry");
191 return PTR_ERR(priv->rst);
192 }
193 reset_control_deassert(priv->rst);
194
195 priv->clk = devm_clk_get(drm->dev, NULL);
196 if (IS_ERR(priv->clk)) {
197 dev_err(&pdev->dev,
198 "missing or invalid clk device tree entry");
199 return PTR_ERR(priv->clk);
200 }
201 clk_prepare_enable(priv->clk);
202
203 /* Sanitize control registers */
204 writel(0, priv->base + CRT_CTRL1);
205 writel(0, priv->base + CRT_CTRL2);
206
207 ret = aspeed_gfx_setup_mode_config(drm);
208 if (ret < 0)
209 return ret;
210
211 ret = drm_vblank_init(drm, 1);
212 if (ret < 0) {
213 dev_err(drm->dev, "Failed to initialise vblank\n");
214 return ret;
215 }
216
217 ret = aspeed_gfx_create_output(drm);
218 if (ret < 0) {
219 dev_err(drm->dev, "Failed to create outputs\n");
220 return ret;
221 }
222
223 ret = aspeed_gfx_create_pipe(drm);
224 if (ret < 0) {
225 dev_err(drm->dev, "Cannot setup simple display pipe\n");
226 return ret;
227 }
228
229 ret = devm_request_irq(drm->dev, platform_get_irq(pdev, 0),
230 aspeed_gfx_irq_handler, 0, "aspeed gfx", drm);
231 if (ret < 0) {
232 dev_err(drm->dev, "Failed to install IRQ handler\n");
233 return ret;
234 }
235
236 drm_mode_config_reset(drm);
237
238 return 0;
239}
240
241static void aspeed_gfx_unload(struct drm_device *drm)
242{
243 drm_kms_helper_poll_fini(drm);
244}
245
246DEFINE_DRM_GEM_DMA_FOPS(fops);
247
248static const struct drm_driver aspeed_gfx_driver = {
249 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
250 DRM_GEM_DMA_DRIVER_OPS,
251 DRM_FBDEV_DMA_DRIVER_OPS,
252 .fops = &fops,
253 .name = "aspeed-gfx-drm",
254 .desc = "ASPEED GFX DRM",
255 .date = "20180319",
256 .major = 1,
257 .minor = 0,
258};
259
260static ssize_t dac_mux_store(struct device *dev, struct device_attribute *attr,
261 const char *buf, size_t count)
262{
263 struct aspeed_gfx *priv = dev_get_drvdata(dev);
264 u32 val;
265 int rc;
266
267 rc = kstrtou32(buf, 0, &val);
268 if (rc)
269 return rc;
270
271 if (val > 3)
272 return -EINVAL;
273
274 rc = regmap_update_bits(priv->scu, priv->dac_reg, 0x30000, val << 16);
275 if (rc < 0)
276 return 0;
277
278 return count;
279}
280
281static ssize_t dac_mux_show(struct device *dev, struct device_attribute *attr, char *buf)
282{
283 struct aspeed_gfx *priv = dev_get_drvdata(dev);
284 u32 reg;
285 int rc;
286
287 rc = regmap_read(priv->scu, priv->dac_reg, ®);
288 if (rc)
289 return rc;
290
291 return sprintf(buf, "%u\n", (reg >> 16) & 0x3);
292}
293static DEVICE_ATTR_RW(dac_mux);
294
295static ssize_t
296vga_pw_show(struct device *dev, struct device_attribute *attr, char *buf)
297{
298 struct aspeed_gfx *priv = dev_get_drvdata(dev);
299 u32 reg;
300 int rc;
301
302 rc = regmap_read(priv->scu, priv->vga_scratch_reg, ®);
303 if (rc)
304 return rc;
305
306 return sprintf(buf, "%u\n", reg);
307}
308static DEVICE_ATTR_RO(vga_pw);
309
310static struct attribute *aspeed_sysfs_entries[] = {
311 &dev_attr_vga_pw.attr,
312 &dev_attr_dac_mux.attr,
313 NULL,
314};
315
316static struct attribute_group aspeed_sysfs_attr_group = {
317 .attrs = aspeed_sysfs_entries,
318};
319
320static int aspeed_gfx_probe(struct platform_device *pdev)
321{
322 struct aspeed_gfx *priv;
323 int ret;
324
325 priv = devm_drm_dev_alloc(&pdev->dev, &aspeed_gfx_driver,
326 struct aspeed_gfx, drm);
327 if (IS_ERR(priv))
328 return PTR_ERR(priv);
329
330 ret = aspeed_gfx_load(&priv->drm);
331 if (ret)
332 return ret;
333
334 platform_set_drvdata(pdev, priv);
335
336 ret = sysfs_create_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group);
337 if (ret)
338 return ret;
339
340 ret = drm_dev_register(&priv->drm, 0);
341 if (ret)
342 goto err_unload;
343
344 drm_client_setup(&priv->drm, NULL);
345 return 0;
346
347err_unload:
348 sysfs_remove_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group);
349 aspeed_gfx_unload(&priv->drm);
350
351 return ret;
352}
353
354static void aspeed_gfx_remove(struct platform_device *pdev)
355{
356 struct drm_device *drm = platform_get_drvdata(pdev);
357
358 sysfs_remove_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group);
359 drm_dev_unregister(drm);
360 aspeed_gfx_unload(drm);
361 drm_atomic_helper_shutdown(drm);
362}
363
364static void aspeed_gfx_shutdown(struct platform_device *pdev)
365{
366 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
367}
368
369static struct platform_driver aspeed_gfx_platform_driver = {
370 .probe = aspeed_gfx_probe,
371 .remove = aspeed_gfx_remove,
372 .shutdown = aspeed_gfx_shutdown,
373 .driver = {
374 .name = "aspeed_gfx",
375 .of_match_table = aspeed_gfx_match,
376 },
377};
378
379drm_module_platform_driver(aspeed_gfx_platform_driver);
380
381MODULE_AUTHOR("Joel Stanley <joel@jms.id.au>");
382MODULE_DESCRIPTION("ASPEED BMC DRM/KMS driver");
383MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0+
2// Copyright 2018 IBM Corporation
3
4#include <linux/clk.h>
5#include <linux/dma-mapping.h>
6#include <linux/irq.h>
7#include <linux/mfd/syscon.h>
8#include <linux/module.h>
9#include <linux/of.h>
10#include <linux/of_reserved_mem.h>
11#include <linux/platform_device.h>
12#include <linux/regmap.h>
13#include <linux/reset.h>
14
15#include <drm/drm_atomic_helper.h>
16#include <drm/drm_crtc_helper.h>
17#include <drm/drm_device.h>
18#include <drm/drm_fb_cma_helper.h>
19#include <drm/drm_fb_helper.h>
20#include <drm/drm_gem_cma_helper.h>
21#include <drm/drm_gem_framebuffer_helper.h>
22#include <drm/drm_probe_helper.h>
23#include <drm/drm_simple_kms_helper.h>
24#include <drm/drm_vblank.h>
25#include <drm/drm_drv.h>
26
27#include "aspeed_gfx.h"
28
29/**
30 * DOC: ASPEED GFX Driver
31 *
32 * This driver is for the ASPEED BMC SoC's 'GFX' display hardware, also called
33 * the 'SOC Display Controller' in the datasheet. This driver runs on the ARM
34 * based BMC systems, unlike the ast driver which runs on a host CPU and is for
35 * a PCIe graphics device.
36 *
37 * The AST2500 supports a total of 3 output paths:
38 *
39 * 1. VGA output, the output target can choose either or both to the DAC
40 * or DVO interface.
41 *
42 * 2. Graphics CRT output, the output target can choose either or both to
43 * the DAC or DVO interface.
44 *
45 * 3. Video input from DVO, the video input can be used for video engine
46 * capture or DAC display output.
47 *
48 * Output options are selected in SCU2C.
49 *
50 * The "VGA mode" device is the PCI attached controller. The "Graphics CRT"
51 * is the ARM's internal display controller.
52 *
53 * The driver only supports a simple configuration consisting of a 40MHz
54 * pixel clock, fixed by hardware limitations, and the VGA output path.
55 *
56 * The driver was written with the 'AST2500 Software Programming Guide' v17,
57 * which is available under NDA from ASPEED.
58 */
59
60static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = {
61 .fb_create = drm_gem_fb_create,
62 .atomic_check = drm_atomic_helper_check,
63 .atomic_commit = drm_atomic_helper_commit,
64};
65
66static void aspeed_gfx_setup_mode_config(struct drm_device *drm)
67{
68 drm_mode_config_init(drm);
69
70 drm->mode_config.min_width = 0;
71 drm->mode_config.min_height = 0;
72 drm->mode_config.max_width = 800;
73 drm->mode_config.max_height = 600;
74 drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs;
75}
76
77static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data)
78{
79 struct drm_device *drm = data;
80 struct aspeed_gfx *priv = to_aspeed_gfx(drm);
81 u32 reg;
82
83 reg = readl(priv->base + CRT_CTRL1);
84
85 if (reg & CRT_CTRL_VERTICAL_INTR_STS) {
86 drm_crtc_handle_vblank(&priv->pipe.crtc);
87 writel(reg, priv->base + CRT_CTRL1);
88 return IRQ_HANDLED;
89 }
90
91 return IRQ_NONE;
92}
93
94
95
96static int aspeed_gfx_load(struct drm_device *drm)
97{
98 struct platform_device *pdev = to_platform_device(drm->dev);
99 struct aspeed_gfx *priv = to_aspeed_gfx(drm);
100 struct resource *res;
101 int ret;
102
103 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
104 priv->base = devm_ioremap_resource(drm->dev, res);
105 if (IS_ERR(priv->base))
106 return PTR_ERR(priv->base);
107
108 priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu");
109 if (IS_ERR(priv->scu)) {
110 dev_err(&pdev->dev, "failed to find SCU regmap\n");
111 return PTR_ERR(priv->scu);
112 }
113
114 ret = of_reserved_mem_device_init(drm->dev);
115 if (ret) {
116 dev_err(&pdev->dev,
117 "failed to initialize reserved mem: %d\n", ret);
118 return ret;
119 }
120
121 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
122 if (ret) {
123 dev_err(&pdev->dev, "failed to set DMA mask: %d\n", ret);
124 return ret;
125 }
126
127 priv->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
128 if (IS_ERR(priv->rst)) {
129 dev_err(&pdev->dev,
130 "missing or invalid reset controller device tree entry");
131 return PTR_ERR(priv->rst);
132 }
133 reset_control_deassert(priv->rst);
134
135 priv->clk = devm_clk_get(drm->dev, NULL);
136 if (IS_ERR(priv->clk)) {
137 dev_err(&pdev->dev,
138 "missing or invalid clk device tree entry");
139 return PTR_ERR(priv->clk);
140 }
141 clk_prepare_enable(priv->clk);
142
143 /* Sanitize control registers */
144 writel(0, priv->base + CRT_CTRL1);
145 writel(0, priv->base + CRT_CTRL2);
146
147 aspeed_gfx_setup_mode_config(drm);
148
149 ret = drm_vblank_init(drm, 1);
150 if (ret < 0) {
151 dev_err(drm->dev, "Failed to initialise vblank\n");
152 return ret;
153 }
154
155 ret = aspeed_gfx_create_output(drm);
156 if (ret < 0) {
157 dev_err(drm->dev, "Failed to create outputs\n");
158 return ret;
159 }
160
161 ret = aspeed_gfx_create_pipe(drm);
162 if (ret < 0) {
163 dev_err(drm->dev, "Cannot setup simple display pipe\n");
164 return ret;
165 }
166
167 ret = devm_request_irq(drm->dev, platform_get_irq(pdev, 0),
168 aspeed_gfx_irq_handler, 0, "aspeed gfx", drm);
169 if (ret < 0) {
170 dev_err(drm->dev, "Failed to install IRQ handler\n");
171 return ret;
172 }
173
174 drm_mode_config_reset(drm);
175
176 return 0;
177}
178
179static void aspeed_gfx_unload(struct drm_device *drm)
180{
181 drm_kms_helper_poll_fini(drm);
182 drm_mode_config_cleanup(drm);
183}
184
185DEFINE_DRM_GEM_CMA_FOPS(fops);
186
187static struct drm_driver aspeed_gfx_driver = {
188 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
189 .gem_create_object = drm_gem_cma_create_object_default_funcs,
190 .dumb_create = drm_gem_cma_dumb_create,
191 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
192 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
193 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
194 .gem_prime_mmap = drm_gem_prime_mmap,
195 .fops = &fops,
196 .name = "aspeed-gfx-drm",
197 .desc = "ASPEED GFX DRM",
198 .date = "20180319",
199 .major = 1,
200 .minor = 0,
201};
202
203static const struct of_device_id aspeed_gfx_match[] = {
204 { .compatible = "aspeed,ast2500-gfx" },
205 { }
206};
207
208static int aspeed_gfx_probe(struct platform_device *pdev)
209{
210 struct aspeed_gfx *priv;
211 int ret;
212
213 priv = devm_drm_dev_alloc(&pdev->dev, &aspeed_gfx_driver,
214 struct aspeed_gfx, drm);
215 if (IS_ERR(priv))
216 return PTR_ERR(priv);
217
218 ret = aspeed_gfx_load(&priv->drm);
219 if (ret)
220 return ret;
221
222 ret = drm_dev_register(&priv->drm, 0);
223 if (ret)
224 goto err_unload;
225
226 drm_fbdev_generic_setup(&priv->drm, 32);
227 return 0;
228
229err_unload:
230 aspeed_gfx_unload(&priv->drm);
231
232 return ret;
233}
234
235static int aspeed_gfx_remove(struct platform_device *pdev)
236{
237 struct drm_device *drm = platform_get_drvdata(pdev);
238
239 drm_dev_unregister(drm);
240 aspeed_gfx_unload(drm);
241
242 return 0;
243}
244
245static struct platform_driver aspeed_gfx_platform_driver = {
246 .probe = aspeed_gfx_probe,
247 .remove = aspeed_gfx_remove,
248 .driver = {
249 .name = "aspeed_gfx",
250 .of_match_table = aspeed_gfx_match,
251 },
252};
253
254module_platform_driver(aspeed_gfx_platform_driver);
255
256MODULE_AUTHOR("Joel Stanley <joel@jms.id.au>");
257MODULE_DESCRIPTION("ASPEED BMC DRM/KMS driver");
258MODULE_LICENSE("GPL");