From 13176bbf183c82281a0e65519780ffebff5abc9d Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Thu, 17 Jan 2013 09:59:33 +0000 Subject: [PATCH] ACPI: add support for CSRT table Core System Resources Table (CSRT) is a proprietary ACPI table that contains resources for certain devices that are not found in the DSDT table. Typically a shared DMA controller might be found here. This patch adds support for this table. We go through all entries in the table and make platform devices of them. The resources from the table are passed with the platform device. There is one special resource in the table and it is the DMA request line base and number of request lines. This information might be needed by the DMA controller driver as it needs to map the ACPI DMA request line number to the actual request line understood by the hardware. This range is passed as IORESOURCE_DMA resource. Signed-off-by: Andy Shevchenko Signed-off-by: Mika Westerberg Signed-off-by: Rafael J. Wysocki --- drivers/acpi/Makefile | 1 + drivers/acpi/csrt.c | 159 ++++++++++++++++++++++++++++++++++++++++ drivers/acpi/internal.h | 1 + drivers/acpi/scan.c | 1 + 4 files changed, 162 insertions(+) create mode 100644 drivers/acpi/csrt.c diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 4ee2e753306a..474fcfeba66c 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -38,6 +38,7 @@ acpi-y += processor_core.o acpi-y += ec.o acpi-$(CONFIG_ACPI_DOCK) += dock.o acpi-y += pci_root.o pci_link.o pci_irq.o +acpi-y += csrt.o acpi-y += acpi_platform.o acpi-y += power.o acpi-y += event.o diff --git a/drivers/acpi/csrt.c b/drivers/acpi/csrt.c new file mode 100644 index 000000000000..5c15a91faf0b --- /dev/null +++ b/drivers/acpi/csrt.c @@ -0,0 +1,159 @@ +/* + * Support for Core System Resources Table (CSRT) + * + * Copyright (C) 2013, Intel Corporation + * Authors: Mika Westerberg + * Andy Shevchenko + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#define pr_fmt(fmt) "ACPI: CSRT: " fmt + +#include +#include +#include +#include +#include +#include + +ACPI_MODULE_NAME("CSRT"); + +static int __init acpi_csrt_parse_shared_info(struct platform_device *pdev, + const struct acpi_csrt_group *grp) +{ + const struct acpi_csrt_shared_info *si; + struct resource res[3]; + size_t nres; + int ret; + + memset(res, 0, sizeof(res)); + nres = 0; + + si = (const struct acpi_csrt_shared_info *)&grp[1]; + /* + * The peripherals that are listed on CSRT typically support only + * 32-bit addresses so we only use the low part of MMIO base for + * now. + */ + if (!si->mmio_base_high && si->mmio_base_low) { + /* + * There is no size of the memory resource in shared_info + * so we assume that it is 4k here. + */ + res[nres].start = si->mmio_base_low; + res[nres].end = res[0].start + SZ_4K - 1; + res[nres++].flags = IORESOURCE_MEM; + } + + if (si->gsi_interrupt) { + int irq = acpi_register_gsi(NULL, si->gsi_interrupt, + si->interrupt_mode, + si->interrupt_polarity); + res[nres].start = irq; + res[nres].end = irq; + res[nres++].flags = IORESOURCE_IRQ; + } + + if (si->base_request_line || si->num_handshake_signals) { + /* + * We pass the driver a DMA resource describing the range + * of request lines the device supports. + */ + res[nres].start = si->base_request_line; + res[nres].end = res[nres].start + si->num_handshake_signals - 1; + res[nres++].flags = IORESOURCE_DMA; + } + + ret = platform_device_add_resources(pdev, res, nres); + if (ret) { + if (si->gsi_interrupt) + acpi_unregister_gsi(si->gsi_interrupt); + return ret; + } + + return 0; +} + +static int __init +acpi_csrt_parse_resource_group(const struct acpi_csrt_group *grp) +{ + struct platform_device *pdev; + char vendor[5], name[16]; + int ret, i; + + vendor[0] = grp->vendor_id; + vendor[1] = grp->vendor_id >> 8; + vendor[2] = grp->vendor_id >> 16; + vendor[3] = grp->vendor_id >> 24; + vendor[4] = '\0'; + + if (grp->shared_info_length != sizeof(struct acpi_csrt_shared_info)) + return -ENODEV; + + snprintf(name, sizeof(name), "%s%04X", vendor, grp->device_id); + pdev = platform_device_alloc(name, PLATFORM_DEVID_AUTO); + if (!pdev) + return -ENOMEM; + + /* Add resources based on the shared info */ + ret = acpi_csrt_parse_shared_info(pdev, grp); + if (ret) + goto fail; + + ret = platform_device_add(pdev); + if (ret) + goto fail; + + for (i = 0; i < pdev->num_resources; i++) + dev_dbg(&pdev->dev, "%pR\n", &pdev->resource[i]); + + return 0; + +fail: + platform_device_put(pdev); + return ret; +} + +/* + * CSRT or Core System Resources Table is a proprietary ACPI table + * introduced by Microsoft. This table can contain devices that are not in + * the system DSDT table. In particular DMA controllers might be described + * here. + * + * We present these devices as normal platform devices that don't have ACPI + * IDs or handle. The platform device name will be something like + * ..auto for example: INTL9C06.0.auto. + */ +void __init acpi_csrt_init(void) +{ + struct acpi_csrt_group *grp, *end; + struct acpi_table_csrt *csrt; + acpi_status status; + int ret; + + status = acpi_get_table(ACPI_SIG_CSRT, 0, + (struct acpi_table_header **)&csrt); + if (ACPI_FAILURE(status)) { + if (status != AE_NOT_FOUND) + pr_warn("failed to get the CSRT table\n"); + return; + } + + pr_debug("parsing CSRT table for devices\n"); + + grp = (struct acpi_csrt_group *)(csrt + 1); + end = (struct acpi_csrt_group *)((void *)csrt + csrt->header.length); + + while (grp < end) { + ret = acpi_csrt_parse_resource_group(grp); + if (ret) { + pr_warn("error in parsing resource group: %d\n", ret); + return; + } + + grp = (struct acpi_csrt_group *)((void *)grp + grp->length); + } +} diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index e050254ae143..4d2e4bf5f88d 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -26,6 +26,7 @@ int init_acpi_device_notify(void); int acpi_scan_init(void); int acpi_sysfs_init(void); +void acpi_csrt_init(void); #ifdef CONFIG_DEBUG_FS extern struct dentry *acpi_debugfs_dir; diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 7d164a966b0d..a85b4080c3ca 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1699,6 +1699,7 @@ int __init acpi_scan_init(void) acpi_power_init(); acpi_pci_root_init(); + acpi_csrt_init(); /* * Enumerate devices in the ACPI namespace. -- 2.20.1