Lines Matching +full:bcm2835 +full:- +full:pwm
1 // SPDX-License-Identifier: GPL-2.0+
5 * Even though clk-bcm2835 provides an interface to the hardware registers for
8 * over-temperature and under-voltage protections provided by the firmware.
14 #include <linux/clk-provider.h>
19 #include <soc/bcm2835/raspberrypi-firmware.h>
31 [RPI_FIRMWARE_PWM_CLK_ID] = "pwm",
35 [RPI_FIRMWARE_PIXEL_BVB_CLK_ID] = "pixel-bvb",
182 * https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
195 .id = cpu_to_le32(data->id), in raspberrypi_clock_property()
212 struct raspberrypi_clk *rpi = data->rpi; in raspberrypi_fw_is_prepared()
216 ret = raspberrypi_clock_property(rpi->firmware, data, in raspberrypi_fw_is_prepared()
219 dev_err_ratelimited(rpi->dev, "Failed to get %s state: %d\n", in raspberrypi_fw_is_prepared()
232 struct raspberrypi_clk *rpi = data->rpi; in raspberrypi_fw_get_rate()
236 ret = raspberrypi_clock_property(rpi->firmware, data, in raspberrypi_fw_get_rate()
239 dev_err_ratelimited(rpi->dev, "Failed to get %s frequency: %d\n", in raspberrypi_fw_get_rate()
251 struct raspberrypi_clk *rpi = data->rpi; in raspberrypi_fw_set_rate()
255 ret = raspberrypi_clock_property(rpi->firmware, data, in raspberrypi_fw_set_rate()
258 dev_err_ratelimited(rpi->dev, "Failed to change %s frequency: %d\n", in raspberrypi_fw_set_rate()
268 struct raspberrypi_clk_variant *variant = data->variant; in raspberrypi_fw_dumb_determine_rate()
276 req->rate = clamp(req->rate, req->min_rate, req->max_rate); in raspberrypi_fw_dumb_determine_rate()
283 if (variant->minimize && req->min_rate > 0) in raspberrypi_fw_dumb_determine_rate()
284 req->rate = req->min_rate; in raspberrypi_fw_dumb_determine_rate()
292 struct raspberrypi_clk *rpi = data->rpi; in raspberrypi_fw_prepare()
296 ret = raspberrypi_clock_property(rpi->firmware, data, in raspberrypi_fw_prepare()
299 dev_err_ratelimited(rpi->dev, in raspberrypi_fw_prepare()
309 struct raspberrypi_clk *rpi = data->rpi; in raspberrypi_fw_unprepare()
313 ret = raspberrypi_clock_property(rpi->firmware, data, in raspberrypi_fw_unprepare()
316 dev_err_ratelimited(rpi->dev, in raspberrypi_fw_unprepare()
340 data = devm_kzalloc(rpi->dev, sizeof(*data), GFP_KERNEL); in raspberrypi_clk_register()
342 return ERR_PTR(-ENOMEM); in raspberrypi_clk_register()
343 data->rpi = rpi; in raspberrypi_clk_register()
344 data->id = id; in raspberrypi_clk_register()
345 data->variant = variant; in raspberrypi_clk_register()
347 init.name = devm_kasprintf(rpi->dev, GFP_KERNEL, in raspberrypi_clk_register()
348 "fw-clk-%s", in raspberrypi_clk_register()
351 return ERR_PTR(-ENOMEM); in raspberrypi_clk_register()
353 init.flags = variant->flags | CLK_GET_RATE_NOCACHE; in raspberrypi_clk_register()
355 data->hw.init = &init; in raspberrypi_clk_register()
357 ret = raspberrypi_clock_property(rpi->firmware, data, in raspberrypi_clk_register()
361 dev_err(rpi->dev, "Failed to get clock %d min freq: %d\n", in raspberrypi_clk_register()
366 ret = raspberrypi_clock_property(rpi->firmware, data, in raspberrypi_clk_register()
370 dev_err(rpi->dev, "Failed to get clock %d max freq: %d\n", in raspberrypi_clk_register()
375 ret = devm_clk_hw_register(rpi->dev, &data->hw); in raspberrypi_clk_register()
379 clk_hw_set_rate_range(&data->hw, min_rate, max_rate); in raspberrypi_clk_register()
381 if (variant->clkdev) { in raspberrypi_clk_register()
382 ret = devm_clk_hw_register_clkdev(rpi->dev, &data->hw, in raspberrypi_clk_register()
383 NULL, variant->clkdev); in raspberrypi_clk_register()
385 dev_err(rpi->dev, "Failed to initialize clkdev\n"); in raspberrypi_clk_register()
390 if (variant->maximize) in raspberrypi_clk_register()
391 variant->min_rate = max_rate; in raspberrypi_clk_register()
393 if (variant->min_rate) { in raspberrypi_clk_register()
396 clk_hw_set_rate_range(&data->hw, variant->min_rate, max_rate); in raspberrypi_clk_register()
398 rate = raspberrypi_fw_get_rate(&data->hw, 0); in raspberrypi_clk_register()
399 if (rate < variant->min_rate) { in raspberrypi_clk_register()
400 ret = raspberrypi_fw_set_rate(&data->hw, variant->min_rate, 0); in raspberrypi_clk_register()
406 return &data->hw; in raspberrypi_clk_register()
425 clks = devm_kcalloc(rpi->dev, in raspberrypi_discover_clocks()
429 return -ENOMEM; in raspberrypi_discover_clocks()
431 ret = rpi_firmware_property(rpi->firmware, RPI_FIRMWARE_GET_CLOCKS, in raspberrypi_discover_clocks()
437 while (clks->id) { in raspberrypi_discover_clocks()
440 if (clks->id >= RPI_FIRMWARE_NUM_CLK_ID) { in raspberrypi_discover_clocks()
441 dev_err(rpi->dev, "Unknown clock id: %u (max: %u)\n", in raspberrypi_discover_clocks()
442 clks->id, RPI_FIRMWARE_NUM_CLK_ID - 1); in raspberrypi_discover_clocks()
443 return -EINVAL; in raspberrypi_discover_clocks()
446 variant = &raspberrypi_clk_variants[clks->id]; in raspberrypi_discover_clocks()
447 if (variant->export) { in raspberrypi_discover_clocks()
450 hw = raspberrypi_clk_register(rpi, clks->parent, in raspberrypi_discover_clocks()
451 clks->id, variant); in raspberrypi_discover_clocks()
455 data->num = clks->id + 1; in raspberrypi_discover_clocks()
456 data->hws[clks->id] = hw; in raspberrypi_discover_clocks()
469 struct device *dev = &pdev->dev; in raspberrypi_clk_probe()
475 * We can be probed either through the an old-fashioned in raspberrypi_clk_probe()
479 if (dev->of_node) in raspberrypi_clk_probe()
480 firmware_node = of_get_parent(dev->of_node); in raspberrypi_clk_probe()
483 "raspberrypi,bcm2835-firmware"); in raspberrypi_clk_probe()
486 return -ENOENT; in raspberrypi_clk_probe()
489 firmware = devm_rpi_firmware_get(&pdev->dev, firmware_node); in raspberrypi_clk_probe()
492 return -EPROBE_DEFER; in raspberrypi_clk_probe()
496 return -ENOMEM; in raspberrypi_clk_probe()
498 rpi->dev = dev; in raspberrypi_clk_probe()
499 rpi->firmware = firmware; in raspberrypi_clk_probe()
506 return -ENOMEM; in raspberrypi_clk_probe()
517 rpi->cpufreq = platform_device_register_data(dev, "raspberrypi-cpufreq", in raspberrypi_clk_probe()
518 -1, NULL, 0); in raspberrypi_clk_probe()
527 platform_device_unregister(rpi->cpufreq); in raspberrypi_clk_remove()
531 { .compatible = "raspberrypi,firmware-clocks" },
538 .name = "raspberrypi-clk",