1 // SPDX-License-Identifier: GPL-2.0-only
3  *  RISC-V Specific Low-Level ACPI Boot Support
5  *  Copyright (C) 2013-2014, Linaro Ltd.
12  *  Copyright (C) 2021-2023, Ventana Micro Systems Inc.
17 #include <linux/efi-bgrt.h>
41 		return -EINVAL;  in parse_acpi()
51 		return -EINVAL;	/* Core will print when we return error */  in parse_acpi()
58  * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
72 	 * and carry out revision and ACPI HW reduced compliancy tests  in acpi_fadt_sanity_check()
79 		return -ENODEV;  in acpi_fadt_sanity_check()
85 	 * The revision in the table header is the FADT's Major revision. The  in acpi_fadt_sanity_check()
86 	 * FADT also has a minor revision, which is stored in the FADT itself.  in acpi_fadt_sanity_check()
89 	 * for HW_REDUCED flag. However, once RISC-V updates are released in  in acpi_fadt_sanity_check()
90 	 * the ACPI spec, we need to update this check for exact minor revision  in acpi_fadt_sanity_check()
92 	if (table->revision < 6 || (table->revision == 6 && fadt->minor_revision < 5))  in acpi_fadt_sanity_check()
93 		pr_err(FW_BUG "Unsupported FADT revision %d.%d, should be 6.5+\n",  in acpi_fadt_sanity_check()
94 		       table->revision, fadt->minor_revision);  in acpi_fadt_sanity_check()
96 	if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {  in acpi_fadt_sanity_check()
98 		ret = -EINVAL;  in acpi_fadt_sanity_check()
113  *	3. check ACPI FADT HW reduced flag
115  * We can parse ACPI boot-time tables such as MADT after
120  * - ACPI tables are initialized and sanity checks passed
121  * - acpi=force was passed in the command line and ACPI was not disabled
130 	 * - ACPI has been disabled explicitly (acpi=off), or  in acpi_boot_table_init()
131 	 * - firmware has not populated ACPI ptr in EFI system table  in acpi_boot_table_init()
174 	if (!(rintc->flags & ACPI_MADT_ENABLED))  in acpi_parse_madt_rintc()
177 	cpuid = riscv_hartid_to_cpuid(rintc->hart_id);  in acpi_parse_madt_rintc()
236 		u64 end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);  in acpi_os_ioremap()
238 		if (phys < md->phys_addr || phys >= end)  in acpi_os_ioremap()
257 		switch (region->type) {  in acpi_os_ioremap()
303 			if (region->attribute & EFI_MEMORY_WB)  in acpi_os_ioremap()
305 			else if ((region->attribute & EFI_MEMORY_WC) ||  in acpi_os_ioremap()
306 				 (region->attribute & EFI_MEMORY_WT))  in acpi_os_ioremap()
317  * raw_pci_read/write - Platform-specific PCI config space access.
326 	return b->ops->read(b, devfn, reg, len, val);  in raw_pci_read()
336 	return b->ops->write(b, devfn, reg, len, val);  in raw_pci_write()