1 // SPDX-License-Identifier: GPL-2.0-only
3  * Loongson-2K Board Management Controller (BMC) Core Driver.
5  * Copyright (C) 2024-2025 Loongson Technology Corporation Limited.
29 /* LS2K BMC resources */
66 /* Maximum time to wait for U-Boot and DDR to be ready with ms. */
96 	DEFINE_RES_MEM_NAMED(LS2K_DISPLAY_RES_START, SZ_4M, "simpledrm-res"),
100 	DEFINE_RES_MEM_NAMED(LS2K_IPMI0_RES_START, LS2K_IPMI_RES_SIZE, "ipmi0-res"),
104 	DEFINE_RES_MEM_NAMED(LS2K_IPMI1_RES_START, LS2K_IPMI_RES_SIZE, "ipmi1-res"),
108 	DEFINE_RES_MEM_NAMED(LS2K_IPMI2_RES_START, LS2K_IPMI_RES_SIZE, "ipmi2-res"),
112 	DEFINE_RES_MEM_NAMED(LS2K_IPMI3_RES_START, LS2K_IPMI_RES_SIZE, "ipmi3-res"),
116 	DEFINE_RES_MEM_NAMED(LS2K_IPMI4_RES_START, LS2K_IPMI_RES_SIZE, "ipmi4-res"),
121 		.name = "simple-framebuffer",
126 		.name = "ls2k-ipmi-si",
131 		.name = "ls2k-ipmi-si",
136 		.name = "ls2k-ipmi-si",
141 		.name = "ls2k-ipmi-si",
146 		.name = "ls2k-ipmi-si",
207 		dev_err(ddata->dev, "PCI-E training failed status=0x%x\n", val);  in ls2k_bmc_pcie_is_connected()
219 	pci_write_config_dword(parent, PCI_COMMAND, ddata->bridge_pci_data.pci_command);  in ls2k_bmc_restore_bridge_pci_data()
222 		pci_write_config_dword(parent, base, ddata->bridge_pci_data.base_address[i]);  in ls2k_bmc_restore_bridge_pci_data()
224 	pci_write_config_dword(parent, PCI_ROM_ADDRESS, ddata->bridge_pci_data.rom_addreess);  in ls2k_bmc_restore_bridge_pci_data()
225 	pci_write_config_dword(parent, PCI_INTERRUPT_LINE, ddata->bridge_pci_data.interrupt_line);  in ls2k_bmc_restore_bridge_pci_data()
227 	pci_write_config_dword(parent, parent->msi_cap + PCI_MSI_ADDRESS_LO,  in ls2k_bmc_restore_bridge_pci_data()
228 			       ddata->bridge_pci_data.msi_lo);  in ls2k_bmc_restore_bridge_pci_data()
229 	pci_write_config_dword(parent, parent->msi_cap + PCI_MSI_ADDRESS_HI,  in ls2k_bmc_restore_bridge_pci_data()
230 			       ddata->bridge_pci_data.msi_hi);  in ls2k_bmc_restore_bridge_pci_data()
231 	pci_write_config_dword(parent, parent->pcie_cap + PCI_EXP_DEVCTL,  in ls2k_bmc_restore_bridge_pci_data()
232 			       ddata->bridge_pci_data.devctl);  in ls2k_bmc_restore_bridge_pci_data()
233 	pci_write_config_dword(parent, parent->pcie_cap + PCI_EXP_LNKCAP,  in ls2k_bmc_restore_bridge_pci_data()
234 			       ddata->bridge_pci_data.linkcap);  in ls2k_bmc_restore_bridge_pci_data()
235 	pci_write_config_dword(parent, parent->pcie_cap + PCI_EXP_LNKCTL,  in ls2k_bmc_restore_bridge_pci_data()
236 			       ddata->bridge_pci_data.linkctl_sts);  in ls2k_bmc_restore_bridge_pci_data()
238 	pci_write_config_dword(parent, LS7A_GEN2_CTL, ddata->bridge_pci_data.gen2_ctrl);  in ls2k_bmc_restore_bridge_pci_data()
239 	pci_write_config_dword(parent, LS7A_SYMBOL_TIMER, ddata->bridge_pci_data.symbol_timer);  in ls2k_bmc_restore_bridge_pci_data()
245 	struct pci_dev *pdev = to_pci_dev(ddata->dev);  in ls2k_bmc_recover_pci_data()
246 	struct pci_dev *parent = pdev->bus->self;  in ls2k_bmc_recover_pci_data()
250 	 * Clear the bus, io and mem resources of the PCI-E bridge to zero, so that  in ls2k_bmc_recover_pci_data()
251 	 * the processor can not access the LS2K PCI-E port, to avoid crashing due to  in ls2k_bmc_recover_pci_data()
252 	 * the lack of return signal from accessing the LS2K PCI-E port.  in ls2k_bmc_recover_pci_data()
259 	 * When the LS2K BMC is reset, the LS7A PCI-E port is also reset, and its PCI  in ls2k_bmc_recover_pci_data()
260 	 * BAR0 register is cleared. Due to the time gap between the GPIO interrupt  in ls2k_bmc_recover_pci_data()
261 	 * generation and the LS2K BMC reset, the LS7A PCI BAR0 register is read to  in ls2k_bmc_recover_pci_data()
264 	for (i = LS7A_BAR0_CHECK_MAX_TIMES; i > 0 ; i--) {  in ls2k_bmc_recover_pci_data()
275 	/* Check if PCI-E is connected */  in ls2k_bmc_recover_pci_data()
279 	/* Waiting for U-Boot and DDR ready */  in ls2k_bmc_recover_pci_data()
284 	/* Restore LS2K BMC PCI-E config data */  in ls2k_bmc_recover_pci_data()
285 	pci_write_config_dword(pdev, PCI_COMMAND, ddata->bmc_pci_data.pci_command);  in ls2k_bmc_recover_pci_data()
286 	pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, ddata->bmc_pci_data.base_address0);  in ls2k_bmc_recover_pci_data()
287 	pci_write_config_dword(pdev, PCI_INTERRUPT_LINE, ddata->bmc_pci_data.interrupt_line);  in ls2k_bmc_recover_pci_data()
297 	 * The PCI-E is lost when the BMC resets, at which point access to the PCI-E  in ls2k_bmc_events_fn()
303 		/* Re-push the display due to previous PCI-E loss. */  in ls2k_bmc_events_fn()
304 		set_console(vt_move_to_console(MAX_NR_CONSOLES - 1, 1));  in ls2k_bmc_events_fn()
318 		schedule_work(&ddata->bmc_reset_work);  in ls2k_bmc_interrupt()
331 	struct pci_dev *parent = pdev->bus->self;  in ls2k_bmc_save_pci_data()
334 	pci_read_config_dword(parent, PCI_COMMAND, &ddata->bridge_pci_data.pci_command);  in ls2k_bmc_save_pci_data()
337 		pci_read_config_dword(parent, base, &ddata->bridge_pci_data.base_address[i]);  in ls2k_bmc_save_pci_data()
339 	pci_read_config_dword(parent, PCI_ROM_ADDRESS, &ddata->bridge_pci_data.rom_addreess);  in ls2k_bmc_save_pci_data()
340 	pci_read_config_dword(parent, PCI_INTERRUPT_LINE, &ddata->bridge_pci_data.interrupt_line);  in ls2k_bmc_save_pci_data()
342 	pci_read_config_dword(parent, parent->msi_cap + PCI_MSI_ADDRESS_LO,  in ls2k_bmc_save_pci_data()
343 			      &ddata->bridge_pci_data.msi_lo);  in ls2k_bmc_save_pci_data()
344 	pci_read_config_dword(parent, parent->msi_cap + PCI_MSI_ADDRESS_HI,  in ls2k_bmc_save_pci_data()
345 			      &ddata->bridge_pci_data.msi_hi);  in ls2k_bmc_save_pci_data()
347 	pci_read_config_dword(parent, parent->pcie_cap + PCI_EXP_DEVCTL,  in ls2k_bmc_save_pci_data()
348 			      &ddata->bridge_pci_data.devctl);  in ls2k_bmc_save_pci_data()
349 	pci_read_config_dword(parent, parent->pcie_cap + PCI_EXP_LNKCAP,  in ls2k_bmc_save_pci_data()
350 			      &ddata->bridge_pci_data.linkcap);  in ls2k_bmc_save_pci_data()
351 	pci_read_config_dword(parent, parent->pcie_cap + PCI_EXP_LNKCTL,  in ls2k_bmc_save_pci_data()
352 			      &ddata->bridge_pci_data.linkctl_sts);  in ls2k_bmc_save_pci_data()
354 	pci_read_config_dword(parent, LS7A_GEN2_CTL, &ddata->bridge_pci_data.gen2_ctrl);  in ls2k_bmc_save_pci_data()
355 	ddata->bridge_pci_data.gen2_ctrl |= FIELD_PREP(LS7A_GEN2_SPEED_CHANG, 0x1) |  in ls2k_bmc_save_pci_data()
358 	pci_read_config_dword(parent, LS7A_SYMBOL_TIMER, &ddata->bridge_pci_data.symbol_timer);  in ls2k_bmc_save_pci_data()
359 	ddata->bridge_pci_data.symbol_timer |= LS7A_MASK_LEN_MATCH;  in ls2k_bmc_save_pci_data()
361 	pci_read_config_dword(pdev, PCI_COMMAND, &ddata->bmc_pci_data.pci_command);  in ls2k_bmc_save_pci_data()
362 	pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &ddata->bmc_pci_data.base_address0);  in ls2k_bmc_save_pci_data()
363 	pci_read_config_dword(pdev, PCI_INTERRUPT_LINE, &ddata->bmc_pci_data.interrupt_line);  in ls2k_bmc_save_pci_data()
368 	struct pci_dev *pdev = to_pci_dev(ddata->dev);  in ls2k_bmc_init()
374 	INIT_WORK(&ddata->bmc_reset_work, ls2k_bmc_events_fn);  in ls2k_bmc_init()
376 	ret = devm_request_irq(&pdev->dev, pdev->irq, ls2k_bmc_interrupt,  in ls2k_bmc_init()
379 		dev_err(ddata->dev, "Failed to request LS2KBMC PCI-E IRQ %d.\n", pdev->irq);  in ls2k_bmc_init()
385 		return -ENOMEM;  in ls2k_bmc_init()
387 	/* Disable GPIO output */  in ls2k_bmc_init()
391 	/* Enable GPIO functionality */  in ls2k_bmc_init()
395 	/* Set GPIO interrupts to low-level active */  in ls2k_bmc_init()
399 	/* Enable GPIO interrupts */  in ls2k_bmc_init()
406 	 * Since gpio_chip->to_irq is not implemented in the Loongson-3 GPIO driver,  in ls2k_bmc_init()
407 	 * acpi_register_gsi() is used to obtain the GPIO IRQ. The GPIO interrupt is a  in ls2k_bmc_init()
415 	ret = devm_request_irq(ddata->dev, gpio_irq, ls2k_bmc_interrupt,  in ls2k_bmc_init()
416 			       IRQF_SHARED | IRQF_TRIGGER_FALLING, "ls2kbmc gpio", ddata);  in ls2k_bmc_init()
418 		dev_err(ddata->dev, "Failed to request LS2KBMC GPIO IRQ %d.\n", gpio_irq);  in ls2k_bmc_init()
425  * Currently the Loongson-2K BMC hardware does not have an I2C interface to adapt to the
426  * resolution. We set the resolution by presetting "video=1280x1024-16@2M" to the BMC memory.
434 	mode = devm_ioremap(&pdev->dev, pci_resource_start(pdev, 0) + SZ_16M, SZ_16M);  in ls2k_bmc_parse_mode()
436 		return -ENOMEM;  in ls2k_bmc_parse_mode()
442 	ret = kstrtoint(strsep(&mode, "x"), 10, &pd->width);  in ls2k_bmc_parse_mode()
446 	ret = kstrtoint(strsep(&mode, "-"), 10, &pd->height);  in ls2k_bmc_parse_mode()
454 	pd->stride = pd->width * depth / 8;  in ls2k_bmc_parse_mode()
455 	pd->format = depth == 32 ? "a8r8g8b8" : "r5g6b5";  in ls2k_bmc_parse_mode()
471 	ddata = devm_kzalloc(&dev->dev, sizeof(*ddata), GFP_KERNEL);  in ls2k_bmc_probe()
473 		ret = -ENOMEM;  in ls2k_bmc_probe()
477 	ddata->dev = &dev->dev;  in ls2k_bmc_probe()
489 	base = dev->resource[0].start + LS2K_DISPLAY_RES_START;  in ls2k_bmc_probe()
492 	ret = aperture_remove_conflicting_devices(base, SZ_4M, "simple-framebuffer");  in ls2k_bmc_probe()
494 		dev_err(&dev->dev, "Failed to removed firmware framebuffers: %d\n", ret);  in ls2k_bmc_probe()
498 	ret = devm_mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO,  in ls2k_bmc_probe()
500 				   &dev->resource[0], 0, NULL);  in ls2k_bmc_probe()
523 	.name = "ls2k-bmc",
530 MODULE_DESCRIPTION("Loongson-2K Board Management Controller (BMC) Core driver");