472 lines
11 KiB
C
472 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* ipmi_si_platform.c
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*
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* Handling for platform devices in IPMI (ACPI, OF, and things
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* coming from the platform.
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*/
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#define pr_fmt(fmt) "ipmi_platform: " fmt
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#define dev_fmt pr_fmt
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/acpi.h>
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#include "ipmi_si.h"
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#include "ipmi_dmi.h"
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static bool platform_registered;
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static bool si_tryplatform = true;
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#ifdef CONFIG_ACPI
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static bool si_tryacpi = true;
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#endif
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#ifdef CONFIG_OF
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static bool si_tryopenfirmware = true;
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#endif
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#ifdef CONFIG_DMI
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static bool si_trydmi = true;
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#else
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static bool si_trydmi = false;
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#endif
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module_param_named(tryplatform, si_tryplatform, bool, 0);
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MODULE_PARM_DESC(tryplatform,
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"Setting this to zero will disable the default scan of the interfaces identified via platform interfaces besides ACPI, OpenFirmware, and DMI");
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#ifdef CONFIG_ACPI
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module_param_named(tryacpi, si_tryacpi, bool, 0);
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MODULE_PARM_DESC(tryacpi,
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"Setting this to zero will disable the default scan of the interfaces identified via ACPI");
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#endif
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#ifdef CONFIG_OF
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module_param_named(tryopenfirmware, si_tryopenfirmware, bool, 0);
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MODULE_PARM_DESC(tryopenfirmware,
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"Setting this to zero will disable the default scan of the interfaces identified via OpenFirmware");
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#endif
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#ifdef CONFIG_DMI
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module_param_named(trydmi, si_trydmi, bool, 0);
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MODULE_PARM_DESC(trydmi,
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"Setting this to zero will disable the default scan of the interfaces identified via DMI");
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#endif
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#ifdef CONFIG_ACPI
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/* For GPE-type interrupts. */
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static u32 ipmi_acpi_gpe(acpi_handle gpe_device,
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u32 gpe_number, void *context)
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{
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struct si_sm_io *io = context;
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ipmi_si_irq_handler(io->irq, io->irq_handler_data);
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return ACPI_INTERRUPT_HANDLED;
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}
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static void acpi_gpe_irq_cleanup(struct si_sm_io *io)
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{
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if (!io->irq)
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return;
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ipmi_irq_start_cleanup(io);
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acpi_remove_gpe_handler(NULL, io->irq, &ipmi_acpi_gpe);
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}
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static int acpi_gpe_irq_setup(struct si_sm_io *io)
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{
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acpi_status status;
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if (!io->irq)
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return 0;
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status = acpi_install_gpe_handler(NULL,
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io->irq,
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ACPI_GPE_LEVEL_TRIGGERED,
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&ipmi_acpi_gpe,
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io);
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if (ACPI_FAILURE(status)) {
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dev_warn(io->dev,
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"Unable to claim ACPI GPE %d, running polled\n",
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io->irq);
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io->irq = 0;
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return -EINVAL;
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}
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io->irq_cleanup = acpi_gpe_irq_cleanup;
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ipmi_irq_finish_setup(io);
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dev_info(io->dev, "Using ACPI GPE %d\n", io->irq);
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return 0;
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}
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#endif
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static void ipmi_set_addr_data_and_space(struct resource *r, struct si_sm_io *io)
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{
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if (resource_type(r) == IORESOURCE_IO)
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io->addr_space = IPMI_IO_ADDR_SPACE;
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else
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io->addr_space = IPMI_MEM_ADDR_SPACE;
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io->addr_data = r->start;
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}
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static struct resource *
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ipmi_get_info_from_resources(struct platform_device *pdev,
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struct si_sm_io *io)
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{
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struct resource *res, *res_second;
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res = platform_get_mem_or_io(pdev, 0);
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if (!res) {
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dev_err(&pdev->dev, "no I/O or memory address\n");
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return NULL;
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}
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ipmi_set_addr_data_and_space(res, io);
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io->regspacing = DEFAULT_REGSPACING;
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res_second = platform_get_mem_or_io(pdev, 1);
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if (res_second && resource_type(res_second) == resource_type(res)) {
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if (res_second->start > io->addr_data)
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io->regspacing = res_second->start - io->addr_data;
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}
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return res;
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}
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static int platform_ipmi_probe(struct platform_device *pdev)
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{
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struct si_sm_io io;
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u8 type, slave_addr, addr_source, regsize, regshift;
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int rv;
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rv = device_property_read_u8(&pdev->dev, "addr-source", &addr_source);
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if (rv)
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addr_source = SI_PLATFORM;
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if (addr_source >= SI_LAST)
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return -EINVAL;
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if (addr_source == SI_SMBIOS) {
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if (!si_trydmi)
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return -ENODEV;
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} else if (addr_source != SI_HARDCODED) {
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if (!si_tryplatform)
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return -ENODEV;
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}
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rv = device_property_read_u8(&pdev->dev, "ipmi-type", &type);
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if (rv)
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return -ENODEV;
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memset(&io, 0, sizeof(io));
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io.addr_source = addr_source;
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dev_info(&pdev->dev, "probing via %s\n",
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ipmi_addr_src_to_str(addr_source));
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switch (type) {
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case SI_KCS:
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case SI_SMIC:
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case SI_BT:
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io.si_type = type;
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break;
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case SI_TYPE_INVALID: /* User disabled this in hardcode. */
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return -ENODEV;
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default:
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dev_err(&pdev->dev, "ipmi-type property is invalid\n");
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return -EINVAL;
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}
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io.regsize = DEFAULT_REGSIZE;
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rv = device_property_read_u8(&pdev->dev, "reg-size", ®size);
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if (!rv)
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io.regsize = regsize;
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io.regshift = 0;
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rv = device_property_read_u8(&pdev->dev, "reg-shift", ®shift);
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if (!rv)
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io.regshift = regshift;
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if (!ipmi_get_info_from_resources(pdev, &io))
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return -EINVAL;
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rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr);
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if (rv)
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io.slave_addr = 0x20;
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else
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io.slave_addr = slave_addr;
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io.irq = platform_get_irq_optional(pdev, 0);
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if (io.irq > 0)
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io.irq_setup = ipmi_std_irq_setup;
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else
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io.irq = 0;
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io.dev = &pdev->dev;
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pr_info("ipmi_si: %s: %s %#lx regsize %d spacing %d irq %d\n",
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ipmi_addr_src_to_str(addr_source),
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(io.addr_space == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
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io.addr_data, io.regsize, io.regspacing, io.irq);
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ipmi_si_add_smi(&io);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id of_ipmi_match[] = {
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{ .type = "ipmi", .compatible = "ipmi-kcs",
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.data = (void *)(unsigned long) SI_KCS },
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{ .type = "ipmi", .compatible = "ipmi-smic",
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.data = (void *)(unsigned long) SI_SMIC },
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{ .type = "ipmi", .compatible = "ipmi-bt",
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.data = (void *)(unsigned long) SI_BT },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_ipmi_match);
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static int of_ipmi_probe(struct platform_device *pdev)
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{
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const struct of_device_id *match;
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struct si_sm_io io;
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struct resource resource;
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const __be32 *regsize, *regspacing, *regshift;
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struct device_node *np = pdev->dev.of_node;
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int ret;
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int proplen;
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if (!si_tryopenfirmware)
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return -ENODEV;
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dev_info(&pdev->dev, "probing via device tree\n");
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match = of_match_device(of_ipmi_match, &pdev->dev);
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if (!match)
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return -ENODEV;
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if (!of_device_is_available(np))
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return -EINVAL;
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ret = of_address_to_resource(np, 0, &resource);
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if (ret) {
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dev_warn(&pdev->dev, "invalid address from OF\n");
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return ret;
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}
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regsize = of_get_property(np, "reg-size", &proplen);
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if (regsize && proplen != 4) {
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dev_warn(&pdev->dev, "invalid regsize from OF\n");
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return -EINVAL;
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}
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regspacing = of_get_property(np, "reg-spacing", &proplen);
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if (regspacing && proplen != 4) {
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dev_warn(&pdev->dev, "invalid regspacing from OF\n");
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return -EINVAL;
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}
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regshift = of_get_property(np, "reg-shift", &proplen);
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if (regshift && proplen != 4) {
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dev_warn(&pdev->dev, "invalid regshift from OF\n");
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return -EINVAL;
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}
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memset(&io, 0, sizeof(io));
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io.si_type = (enum si_type) match->data;
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io.addr_source = SI_DEVICETREE;
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io.irq_setup = ipmi_std_irq_setup;
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ipmi_set_addr_data_and_space(&resource, &io);
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io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE;
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io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING;
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io.regshift = regshift ? be32_to_cpup(regshift) : 0;
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io.irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
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io.dev = &pdev->dev;
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dev_dbg(&pdev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
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io.addr_data, io.regsize, io.regspacing, io.irq);
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return ipmi_si_add_smi(&io);
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}
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#else
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#define of_ipmi_match NULL
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static int of_ipmi_probe(struct platform_device *dev)
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{
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_ACPI
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static int find_slave_address(struct si_sm_io *io, int slave_addr)
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{
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#ifdef CONFIG_IPMI_DMI_DECODE
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if (!slave_addr)
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slave_addr = ipmi_dmi_get_slave_addr(io->si_type,
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io->addr_space,
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io->addr_data);
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#endif
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return slave_addr;
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}
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static int acpi_ipmi_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct si_sm_io io;
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acpi_handle handle;
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acpi_status status;
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unsigned long long tmp;
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struct resource *res;
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if (!si_tryacpi)
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return -ENODEV;
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handle = ACPI_HANDLE(dev);
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if (!handle)
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return -ENODEV;
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memset(&io, 0, sizeof(io));
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io.addr_source = SI_ACPI;
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dev_info(dev, "probing via ACPI\n");
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io.addr_info.acpi_info.acpi_handle = handle;
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/* _IFT tells us the interface type: KCS, BT, etc */
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status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);
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if (ACPI_FAILURE(status)) {
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dev_err(dev, "Could not find ACPI IPMI interface type\n");
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return -EINVAL;
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}
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switch (tmp) {
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case 1:
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io.si_type = SI_KCS;
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break;
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case 2:
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io.si_type = SI_SMIC;
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break;
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case 3:
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io.si_type = SI_BT;
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break;
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case 4: /* SSIF, just ignore */
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return -ENODEV;
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default:
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dev_info(dev, "unknown IPMI type %lld\n", tmp);
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return -EINVAL;
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}
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io.dev = dev;
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io.regsize = DEFAULT_REGSIZE;
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io.regshift = 0;
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res = ipmi_get_info_from_resources(pdev, &io);
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if (!res)
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return -EINVAL;
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/* If _GPE exists, use it; otherwise use standard interrupts */
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status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
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if (ACPI_SUCCESS(status)) {
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io.irq = tmp;
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io.irq_setup = acpi_gpe_irq_setup;
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} else {
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int irq = platform_get_irq_optional(pdev, 0);
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if (irq > 0) {
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io.irq = irq;
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io.irq_setup = ipmi_std_irq_setup;
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}
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}
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io.slave_addr = find_slave_address(&io, io.slave_addr);
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dev_info(dev, "%pR regsize %d spacing %d irq %d\n",
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res, io.regsize, io.regspacing, io.irq);
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request_module("acpi_ipmi");
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return ipmi_si_add_smi(&io);
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}
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static const struct acpi_device_id acpi_ipmi_match[] = {
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{ "IPI0001", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, acpi_ipmi_match);
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#else
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static int acpi_ipmi_probe(struct platform_device *dev)
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{
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return -ENODEV;
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}
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#endif
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static int ipmi_probe(struct platform_device *pdev)
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{
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if (pdev->dev.of_node && of_ipmi_probe(pdev) == 0)
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return 0;
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if (acpi_ipmi_probe(pdev) == 0)
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return 0;
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return platform_ipmi_probe(pdev);
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}
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static int ipmi_remove(struct platform_device *pdev)
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{
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ipmi_si_remove_by_dev(&pdev->dev);
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return 0;
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}
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static int pdev_match_name(struct device *dev, const void *data)
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{
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struct platform_device *pdev = to_platform_device(dev);
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const char *name = data;
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return strcmp(pdev->name, name) == 0;
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}
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void ipmi_remove_platform_device_by_name(char *name)
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{
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struct device *dev;
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while ((dev = bus_find_device(&platform_bus_type, NULL, name,
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pdev_match_name))) {
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struct platform_device *pdev = to_platform_device(dev);
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platform_device_unregister(pdev);
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put_device(dev);
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}
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}
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static const struct platform_device_id si_plat_ids[] = {
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{ "dmi-ipmi-si", 0 },
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{ "hardcode-ipmi-si", 0 },
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{ "hotmod-ipmi-si", 0 },
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{ }
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};
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struct platform_driver ipmi_platform_driver = {
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.driver = {
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.name = SI_DEVICE_NAME,
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.of_match_table = of_ipmi_match,
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.acpi_match_table = ACPI_PTR(acpi_ipmi_match),
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},
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.probe = ipmi_probe,
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.remove = ipmi_remove,
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.id_table = si_plat_ids
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};
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void ipmi_si_platform_init(void)
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{
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int rv = platform_driver_register(&ipmi_platform_driver);
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if (rv)
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pr_err("Unable to register driver: %d\n", rv);
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else
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platform_registered = true;
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}
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void ipmi_si_platform_shutdown(void)
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{
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if (platform_registered)
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platform_driver_unregister(&ipmi_platform_driver);
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}
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