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-rw-r--r--arch/riscv/kernel/acpi.c251
1 files changed, 251 insertions, 0 deletions
diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c
new file mode 100644
index 0000000000..56cb2c986c
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+++ b/arch/riscv/kernel/acpi.c
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+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * RISC-V Specific Low-Level ACPI Boot Support
+ *
+ * Copyright (C) 2013-2014, Linaro Ltd.
+ * Author: Al Stone <al.stone@linaro.org>
+ * Author: Graeme Gregory <graeme.gregory@linaro.org>
+ * Author: Hanjun Guo <hanjun.guo@linaro.org>
+ * Author: Tomasz Nowicki <tomasz.nowicki@linaro.org>
+ * Author: Naresh Bhat <naresh.bhat@linaro.org>
+ *
+ * Copyright (C) 2021-2023, Ventana Micro Systems Inc.
+ * Author: Sunil V L <sunilvl@ventanamicro.com>
+ */
+
+#include <linux/acpi.h>
+#include <linux/io.h>
+#include <linux/pci.h>
+#include <linux/efi.h>
+
+int acpi_noirq = 1; /* skip ACPI IRQ initialization */
+int acpi_disabled = 1;
+EXPORT_SYMBOL(acpi_disabled);
+
+int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */
+EXPORT_SYMBOL(acpi_pci_disabled);
+
+static bool param_acpi_off __initdata;
+static bool param_acpi_on __initdata;
+static bool param_acpi_force __initdata;
+
+static struct acpi_madt_rintc cpu_madt_rintc[NR_CPUS];
+
+static int __init parse_acpi(char *arg)
+{
+ if (!arg)
+ return -EINVAL;
+
+ /* "acpi=off" disables both ACPI table parsing and interpreter */
+ if (strcmp(arg, "off") == 0)
+ param_acpi_off = true;
+ else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */
+ param_acpi_on = true;
+ else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
+ param_acpi_force = true;
+ else
+ return -EINVAL; /* Core will print when we return error */
+
+ return 0;
+}
+early_param("acpi", parse_acpi);
+
+/*
+ * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
+ * checks on it
+ *
+ * Return 0 on success, <0 on failure
+ */
+static int __init acpi_fadt_sanity_check(void)
+{
+ struct acpi_table_header *table;
+ struct acpi_table_fadt *fadt;
+ acpi_status status;
+ int ret = 0;
+
+ /*
+ * FADT is required on riscv; retrieve it to check its presence
+ * and carry out revision and ACPI HW reduced compliancy tests
+ */
+ status = acpi_get_table(ACPI_SIG_FADT, 0, &table);
+ if (ACPI_FAILURE(status)) {
+ const char *msg = acpi_format_exception(status);
+
+ pr_err("Failed to get FADT table, %s\n", msg);
+ return -ENODEV;
+ }
+
+ fadt = (struct acpi_table_fadt *)table;
+
+ /*
+ * The revision in the table header is the FADT's Major revision. The
+ * FADT also has a minor revision, which is stored in the FADT itself.
+ *
+ * TODO: Currently, we check for 6.5 as the minimum version to check
+ * for HW_REDUCED flag. However, once RISC-V updates are released in
+ * the ACPI spec, we need to update this check for exact minor revision
+ */
+ if (table->revision < 6 || (table->revision == 6 && fadt->minor_revision < 5))
+ pr_err(FW_BUG "Unsupported FADT revision %d.%d, should be 6.5+\n",
+ table->revision, fadt->minor_revision);
+
+ if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
+ pr_err("FADT not ACPI hardware reduced compliant\n");
+ ret = -EINVAL;
+ }
+
+ /*
+ * acpi_get_table() creates FADT table mapping that
+ * should be released after parsing and before resuming boot
+ */
+ acpi_put_table(table);
+ return ret;
+}
+
+/*
+ * acpi_boot_table_init() called from setup_arch(), always.
+ * 1. find RSDP and get its address, and then find XSDT
+ * 2. extract all tables and checksums them all
+ * 3. check ACPI FADT HW reduced flag
+ *
+ * We can parse ACPI boot-time tables such as MADT after
+ * this function is called.
+ *
+ * On return ACPI is enabled if either:
+ *
+ * - ACPI tables are initialized and sanity checks passed
+ * - acpi=force was passed in the command line and ACPI was not disabled
+ * explicitly through acpi=off command line parameter
+ *
+ * ACPI is disabled on function return otherwise
+ */
+void __init acpi_boot_table_init(void)
+{
+ /*
+ * Enable ACPI instead of device tree unless
+ * - ACPI has been disabled explicitly (acpi=off), or
+ * - firmware has not populated ACPI ptr in EFI system table
+ * and ACPI has not been [force] enabled (acpi=on|force)
+ */
+ if (param_acpi_off ||
+ (!param_acpi_on && !param_acpi_force &&
+ efi.acpi20 == EFI_INVALID_TABLE_ADDR))
+ return;
+
+ /*
+ * ACPI is disabled at this point. Enable it in order to parse
+ * the ACPI tables and carry out sanity checks
+ */
+ enable_acpi();
+
+ /*
+ * If ACPI tables are initialized and FADT sanity checks passed,
+ * leave ACPI enabled and carry on booting; otherwise disable ACPI
+ * on initialization error.
+ * If acpi=force was passed on the command line it forces ACPI
+ * to be enabled even if its initialization failed.
+ */
+ if (acpi_table_init() || acpi_fadt_sanity_check()) {
+ pr_err("Failed to init ACPI tables\n");
+ if (!param_acpi_force)
+ disable_acpi();
+ }
+}
+
+static int acpi_parse_madt_rintc(union acpi_subtable_headers *header, const unsigned long end)
+{
+ struct acpi_madt_rintc *rintc = (struct acpi_madt_rintc *)header;
+ int cpuid;
+
+ if (!(rintc->flags & ACPI_MADT_ENABLED))
+ return 0;
+
+ cpuid = riscv_hartid_to_cpuid(rintc->hart_id);
+ /*
+ * When CONFIG_SMP is disabled, mapping won't be created for
+ * all cpus.
+ * CPUs more than num_possible_cpus, will be ignored.
+ */
+ if (cpuid >= 0 && cpuid < num_possible_cpus())
+ cpu_madt_rintc[cpuid] = *rintc;
+
+ return 0;
+}
+
+/*
+ * Instead of parsing (and freeing) the ACPI table, cache
+ * the RINTC structures since they are frequently used
+ * like in cpuinfo.
+ */
+void __init acpi_init_rintc_map(void)
+{
+ if (acpi_table_parse_madt(ACPI_MADT_TYPE_RINTC, acpi_parse_madt_rintc, 0) <= 0) {
+ pr_err("No valid RINTC entries exist\n");
+ BUG();
+ }
+}
+
+struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu)
+{
+ return &cpu_madt_rintc[cpu];
+}
+
+u32 get_acpi_id_for_cpu(int cpu)
+{
+ return acpi_cpu_get_madt_rintc(cpu)->uid;
+}
+
+/*
+ * __acpi_map_table() will be called before paging_init(), so early_ioremap()
+ * or early_memremap() should be called here to for ACPI table mapping.
+ */
+void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
+{
+ if (!size)
+ return NULL;
+
+ return early_ioremap(phys, size);
+}
+
+void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
+{
+ if (!map || !size)
+ return;
+
+ early_iounmap(map, size);
+}
+
+void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
+{
+ return (void __iomem *)memremap(phys, size, MEMREMAP_WB);
+}
+
+#ifdef CONFIG_PCI
+
+/*
+ * These interfaces are defined just to enable building ACPI core.
+ * TODO: Update it with actual implementation when external interrupt
+ * controller support is added in RISC-V ACPI.
+ */
+int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
+ int reg, int len, u32 *val)
+{
+ return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
+ int reg, int len, u32 val)
+{
+ return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
+{
+ return -1;
+}
+
+struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+{
+ return NULL;
+}
+#endif /* CONFIG_PCI */