3  * UP Board FPGA driver.
5  * FPGA provides more GPIO driving power, LEDS and pin mux function.
19 #include <linux/mfd/upboard-fpga.h>
44 	struct upboard_fpga *fpga = context;  in upboard_fpga_read()  local
48 	gpiod_set_value(fpga->clear_gpio, 0);  in upboard_fpga_read()
49 	gpiod_set_value(fpga->clear_gpio, 1);  in upboard_fpga_read()
55 		gpiod_set_value(fpga->strobe_gpio, 0);  in upboard_fpga_read()
56 		gpiod_set_value(fpga->datain_gpio, !!(reg & BIT(i)));  in upboard_fpga_read()
57 		gpiod_set_value(fpga->strobe_gpio, 1);  in upboard_fpga_read()
60 	gpiod_set_value(fpga->strobe_gpio, 0);  in upboard_fpga_read()
65 		gpiod_set_value(fpga->strobe_gpio, 1);  in upboard_fpga_read()
66 		gpiod_set_value(fpga->strobe_gpio, 0);  in upboard_fpga_read()
67 		*val |= gpiod_get_value(fpga->dataout_gpio) << i;  in upboard_fpga_read()
70 	gpiod_set_value(fpga->strobe_gpio, 1);  in upboard_fpga_read()
77 	struct upboard_fpga *fpga = context;  in upboard_fpga_write()  local
81 	gpiod_set_value(fpga->clear_gpio, 0);  in upboard_fpga_write()
82 	gpiod_set_value(fpga->clear_gpio, 1);  in upboard_fpga_write()
86 		gpiod_set_value(fpga->strobe_gpio, 0);  in upboard_fpga_write()
87 		gpiod_set_value(fpga->datain_gpio, !!(reg & BIT(i)));  in upboard_fpga_write()
88 		gpiod_set_value(fpga->strobe_gpio, 1);  in upboard_fpga_write()
91 	gpiod_set_value(fpga->strobe_gpio, 0);  in upboard_fpga_write()
95 		gpiod_set_value(fpga->datain_gpio, !!(val & BIT(i)));  in upboard_fpga_write()
96 		gpiod_set_value(fpga->strobe_gpio, 1);  in upboard_fpga_write()
97 		gpiod_set_value(fpga->strobe_gpio, 0);  in upboard_fpga_write()
100 	gpiod_set_value(fpga->strobe_gpio, 1);  in upboard_fpga_write()
190 static int upboard_fpga_gpio_init(struct upboard_fpga *fpga)  in upboard_fpga_gpio_init()  argument
192 	fpga->enable_gpio = devm_gpiod_get(fpga->dev, "enable", GPIOD_ASIS);  in upboard_fpga_gpio_init()
193 	if (IS_ERR(fpga->enable_gpio))  in upboard_fpga_gpio_init()
194 		return PTR_ERR(fpga->enable_gpio);  in upboard_fpga_gpio_init()
196 	fpga->clear_gpio = devm_gpiod_get(fpga->dev, "clear", GPIOD_OUT_LOW);  in upboard_fpga_gpio_init()
197 	if (IS_ERR(fpga->clear_gpio))  in upboard_fpga_gpio_init()
198 		return PTR_ERR(fpga->clear_gpio);  in upboard_fpga_gpio_init()
200 	fpga->strobe_gpio = devm_gpiod_get(fpga->dev, "strobe", GPIOD_OUT_LOW);  in upboard_fpga_gpio_init()
201 	if (IS_ERR(fpga->strobe_gpio))  in upboard_fpga_gpio_init()
202 		return PTR_ERR(fpga->strobe_gpio);  in upboard_fpga_gpio_init()
204 	fpga->datain_gpio = devm_gpiod_get(fpga->dev, "datain", GPIOD_OUT_LOW);  in upboard_fpga_gpio_init()
205 	if (IS_ERR(fpga->datain_gpio))  in upboard_fpga_gpio_init()
206 		return PTR_ERR(fpga->datain_gpio);  in upboard_fpga_gpio_init()
208 	fpga->dataout_gpio = devm_gpiod_get(fpga->dev, "dataout", GPIOD_IN);  in upboard_fpga_gpio_init()
209 	if (IS_ERR(fpga->dataout_gpio))  in upboard_fpga_gpio_init()
210 		return PTR_ERR(fpga->dataout_gpio);  in upboard_fpga_gpio_init()
212 	gpiod_set_value(fpga->enable_gpio, 1);  in upboard_fpga_gpio_init()
217 static int upboard_fpga_get_firmware_version(struct upboard_fpga *fpga)  in upboard_fpga_get_firmware_version()  argument
222 	if (!fpga)  in upboard_fpga_get_firmware_version()
225 	ret = regmap_read(fpga->regmap, UPBOARD_REG_PLATFORM_ID, &platform_id);  in upboard_fpga_get_firmware_version()
231 		return dev_err_probe(fpga->dev, -ENODEV,  in upboard_fpga_get_firmware_version()
232 				     "driver not compatible with custom FPGA FW from manufacturer id %#02x.",  in upboard_fpga_get_firmware_version()
235 	ret = regmap_read(fpga->regmap, UPBOARD_REG_FIRMWARE_ID, &fpga->firmware_version);  in upboard_fpga_get_firmware_version()
239 	if (FIELD_GET(UPBOARD_FW_ID_MAJOR_MASK, fpga->firmware_version) !=  in upboard_fpga_get_firmware_version()
241 		return dev_err_probe(fpga->dev, -ENODEV,  in upboard_fpga_get_firmware_version()
242 				     "unsupported FPGA FW v%lu.%lu.%lu build %#02lx",  in upboard_fpga_get_firmware_version()
243 				     FIELD_GET(UPBOARD_FW_ID_MAJOR_MASK, fpga->firmware_version),  in upboard_fpga_get_firmware_version()
244 				     FIELD_GET(UPBOARD_FW_ID_MINOR_MASK, fpga->firmware_version),  in upboard_fpga_get_firmware_version()
245 				     FIELD_GET(UPBOARD_FW_ID_PATCH_MASK, fpga->firmware_version),  in upboard_fpga_get_firmware_version()
246 				     FIELD_GET(UPBOARD_FW_ID_BUILD_MASK, fpga->firmware_version));  in upboard_fpga_get_firmware_version()
253 	struct upboard_fpga *fpga = dev_get_drvdata(dev);  in upboard_fpga_version_show()  local
255 	return sysfs_emit(buf, "FPGA FW v%lu.%lu.%lu build %#02lx\n",  in upboard_fpga_version_show()
256 			  FIELD_GET(UPBOARD_FW_ID_MAJOR_MASK, fpga->firmware_version),  in upboard_fpga_version_show()
257 			  FIELD_GET(UPBOARD_FW_ID_MINOR_MASK, fpga->firmware_version),  in upboard_fpga_version_show()
258 			  FIELD_GET(UPBOARD_FW_ID_PATCH_MASK, fpga->firmware_version),  in upboard_fpga_version_show()
259 			  FIELD_GET(UPBOARD_FW_ID_BUILD_MASK, fpga->firmware_version));  in upboard_fpga_version_show()
274 	struct upboard_fpga *fpga;  in upboard_fpga_probe()  local
277 	fpga = devm_kzalloc(dev, sizeof(*fpga), GFP_KERNEL);  in upboard_fpga_probe()
278 	if (!fpga)  in upboard_fpga_probe()
281 	fpga->fpga_data = device_get_match_data(dev);  in upboard_fpga_probe()
283 	fpga->dev = dev;  in upboard_fpga_probe()
285 	platform_set_drvdata(pdev, fpga);  in upboard_fpga_probe()
287 	fpga->regmap = devm_regmap_init(dev, NULL, fpga, fpga->fpga_data->regmap_config);  in upboard_fpga_probe()
288 	if (IS_ERR(fpga->regmap))  in upboard_fpga_probe()
289 		return PTR_ERR(fpga->regmap);  in upboard_fpga_probe()
291 	ret = upboard_fpga_gpio_init(fpga);  in upboard_fpga_probe()
293 		return dev_err_probe(dev, ret, "Failed to initialize FPGA common GPIOs");  in upboard_fpga_probe()
295 	ret = upboard_fpga_get_firmware_version(fpga);  in upboard_fpga_probe()
312 		.name = "upboard-fpga",
323 MODULE_DESCRIPTION("UP Board FPGA driver");