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Wysocki" , Bjorn Helgaas , Len Brown Cc: linux-kernel@vger.kernel.org, Darren Hart , patches@amperecomputing.com Subject: [PATCH] PCI: hotplug: Add extension driver for Ampere Altra hotplug LED control Date: Wed, 27 Sep 2023 13:23:47 -0700 Message-ID: <20230927202347.2795170-1-scott@os.amperecomputing.com> X-Mailer: git-send-email 2.41.0 X-ClientProxiedBy: CH0PR03CA0349.namprd03.prod.outlook.com (2603:10b6:610:11a::33) To MWHPR0101MB2893.prod.exchangelabs.com (2603:10b6:301:33::25) Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWHPR0101MB2893:EE_|BY3PR01MB6675:EE_ X-MS-Office365-Filtering-Correlation-Id: d9f63c02-0c63-4587-652f-08dbbf97aa56 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 3pB/+QU3/8VcxdhaQNnF1wVhIvVO+Yzubz9fP5tBWZjAF3vId8gYtrEQlghx1oNHuEGPoujy9EpcQnDlMXpdctK/qo+PJrt3AcyEsMBovK51rhqaWYFv47QbjFePMa/F7LDDbkU9oTAN2I7fD2tS5s5XOzOwT5FD5ZHTF/hfVLdHUKLtx1qBr8oEipxrzvkPapN2uAkL/BlrwtQDMF/fsdFVAnmzz91e7Wcs6aY6npU7qvgz1ciYP9y0Cbdghle8yxGXnJfDOlE9NvdUUnjvC6Hhrj2tG3Q+v6xIqd9QUn9an4pewIKYqo13XxkV2mZVMCTU3PtLAEtT4xVPGDBywuGXaz2Uo+iFBrEwpGZrVLAevgtifWK5GJfHZ88LaaiRqDYuyidfde3T+EbhiqlQoolgI0rlKnTutbrdnIIehcBoxFGI3IQflvgGe27I+Ubg8082IJC9Qd6QnueWkeTc4hNDDvLWwyupZmmWOWGt5Ii8vhz0T/K49LEy1t97gi+qwpG0gF0AA7+1PXUy6bie8Pkfcb8O8g7VxvwjRvzs1XGlzclZEhBd9AxRm1dU5an/z/AKBrhWWOqnleMDtgCzgr6L6ZVcFjHWUdOfVRIleUeg3MKSkWavO4dISNsG3UYl X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:MWHPR0101MB2893.prod.exchangelabs.com; PTR:; CAT:NONE; SFS:(13230031)(39850400004)(376002)(346002)(136003)(366004)(396003)(230922051799003)(451199024)(186009)(1800799009)(8676002)(8936002)(41300700001)(2906002)(26005)(110136005)(4326008)(478600001)(66476007)(316002)(66946007)(5660300002)(66556008)(6506007)(6666004)(52116002)(6486002)(6512007)(1076003)(2616005)(86362001)(107886003)(83380400001)(38100700002)(38350700002); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: os.amperecomputing.com X-MS-Exchange-CrossTenant-Network-Message-Id: d9f63c02-0c63-4587-652f-08dbbf97aa56 X-MS-Exchange-CrossTenant-AuthSource: MWHPR0101MB2893.prod.exchangelabs.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Sep 2023 20:23:54.8548 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3bc2b170-fd94-476d-b0ce-4229bdc904a7 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 1ICicXavpKeHmoCepMIOVIpEkEsdVvAHUXoBSowYwn+dEpd0rt5LppI+CxCvwpzydj+tJFzeEoU5/8LVK7Kvu1KWoT4b7Ls9XcKsNBvqnZdALbz4djop9xj8tVHOLcai X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY3PR01MB6675 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H2, SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net On Ampere Altra, PCIe hotplug is handled through ACPI. A side interface is also present to request system firmware control of attention LEDs. Add an ACPI PCI Hotplug companion driver to support attention LED control. Signed-off-by: D Scott Phillips --- drivers/pci/hotplug/Kconfig | 13 ++ drivers/pci/hotplug/Makefile | 3 +- drivers/pci/hotplug/acpiphp_ampere_altra.c | 141 +++++++++++++++++++++ 3 files changed, 156 insertions(+), 1 deletion(-) create mode 100644 drivers/pci/hotplug/acpiphp_ampere_altra.c diff --git a/drivers/pci/hotplug/Kconfig b/drivers/pci/hotplug/Kconfig index 48113b210cf93..9fde600a9ad3e 100644 --- a/drivers/pci/hotplug/Kconfig +++ b/drivers/pci/hotplug/Kconfig @@ -61,6 +61,19 @@ config HOTPLUG_PCI_ACPI When in doubt, say N. +config HOTPLUG_PCI_ACPI_AMPERE_ALTRA + tristate "ACPI PCI Hotplug driver Ampere Altra extensions" + depends on HOTPLUG_PCI_ACPI + depends on HAVE_ARM_SMCCC_DISCOVERY + depends on m + help + Say Y here if you have an Ampere Altra system. + + To compile this driver as a module, choose M here: the + module will be called acpiphp_ampere_altra. + + When in doubt, say N. + config HOTPLUG_PCI_ACPI_IBM tristate "ACPI PCI Hotplug driver IBM extensions" depends on HOTPLUG_PCI_ACPI diff --git a/drivers/pci/hotplug/Makefile b/drivers/pci/hotplug/Makefile index 5196983220df6..29d7f6171b305 100644 --- a/drivers/pci/hotplug/Makefile +++ b/drivers/pci/hotplug/Makefile @@ -21,8 +21,9 @@ obj-$(CONFIG_HOTPLUG_PCI_RPA_DLPAR) += rpadlpar_io.o obj-$(CONFIG_HOTPLUG_PCI_ACPI) += acpiphp.o obj-$(CONFIG_HOTPLUG_PCI_S390) += s390_pci_hpc.o -# acpiphp_ibm extends acpiphp, so should be linked afterwards. +# acpiphp_ibm extend acpiphp, so should be linked afterwards. +obj-$(CONFIG_HOTPLUG_PCI_ACPI_AMPERE_ALTRA) += acpiphp_ampere_altra.o obj-$(CONFIG_HOTPLUG_PCI_ACPI_IBM) += acpiphp_ibm.o pci_hotplug-objs := pci_hotplug_core.o diff --git a/drivers/pci/hotplug/acpiphp_ampere_altra.c b/drivers/pci/hotplug/acpiphp_ampere_altra.c new file mode 100644 index 0000000000000..8692b939dea78 --- /dev/null +++ b/drivers/pci/hotplug/acpiphp_ampere_altra.c @@ -0,0 +1,141 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ACPI PCI Hot Plug Ampere Altra Extension + * + * Copyright (C) 2023 Ampere Computing LLC + * + */ + +#define pr_fmt(fmt) "acpiphp_ampere_altra: " fmt + +#include +#include +#include +#include + +#include "acpiphp.h" + +#define HANDLE_OPEN 0xb0200000 +#define HANDLE_CLOSE 0xb0300000 +#define REQUEST 0xf0700000 +#define LED_CMD 0x00000004 +#define LED_ATTENTION 0x00000002 +#define LED_SET_ON 0x00000001 +#define LED_SET_OFF 0x00000002 +#define LED_SET_BLINK 0x00000003 + +static const struct acpi_device_id acpi_ids[] = { + {"AMPC0008", 0}, {} +}; +MODULE_DEVICE_TABLE(acpi, acpi_ids); + +static u32 led_service_id[4]; + +static int led_status(u8 status) +{ + switch (status) { + case 1: return LED_SET_ON; + case 2: return LED_SET_BLINK; + default: return LED_SET_OFF; + } +} + +static int set_attention_status(struct hotplug_slot *slot, u8 status) +{ + struct arm_smccc_res res; + struct pci_bus *bus; + struct pci_dev *root_port; + unsigned long flags; + u32 handle; + int ret = 0; + + bus = slot->pci_slot->bus; + root_port = pcie_find_root_port(bus->self); + if (!root_port) + return -ENODEV; + + local_irq_save(flags); + arm_smccc_smc(HANDLE_OPEN, led_service_id[0], led_service_id[1], + led_service_id[2], led_service_id[3], 0, 0, 0, &res); + if (res.a0) { + ret = -ENODEV; + goto out; + } + handle = res.a1 & 0xffff0000; + + arm_smccc_smc(REQUEST, LED_CMD, led_status(status), LED_ATTENTION, + pci_domain_nr(bus) | ((root_port->devfn >> 3) << 4), 0, 0, + handle, &res); + if (res.a0) + ret = -ENODEV; + + arm_smccc_smc(HANDLE_CLOSE, handle, 0, 0, 0, 0, 0, 0, &res); + + out: + local_irq_restore(flags); + return ret; +} + +static int get_attention_status(struct hotplug_slot *slot, u8 *status) +{ + return -EINVAL; +} + +static struct acpiphp_attention_info ampere_altra_attn = { + .set_attn = set_attention_status, + .get_attn = get_attention_status, + .owner = THIS_MODULE, +}; + +static acpi_status __init get_acpi_handle(acpi_handle handle, u32 level, + void *context, void **return_value) +{ + *(acpi_handle *)return_value = handle; + return AE_CTRL_TERMINATE; +} + +static int __init acpiphp_ampere_altra_init(void) +{ + struct fwnode_handle *fwnode; + acpi_handle leds_handle = NULL; + struct acpi_device *leds; + acpi_status status; + int ret; + + status = acpi_get_devices("AMPC0008", get_acpi_handle, NULL, + &leds_handle); + if (ACPI_FAILURE(status) || !leds_handle) + return -ENODEV; + leds = acpi_get_acpi_dev(leds_handle); + if (!leds) { + pr_err("can't find device\n"); + return -ENODEV; + } + + fwnode = acpi_fwnode_handle(leds); + ret = fwnode_property_read_u32_array(fwnode, "uuid", led_service_id, 4); + acpi_put_acpi_dev(leds); + if (ret) { + pr_err("can't find uuid\n"); + return -ENODEV; + } + + if (acpiphp_register_attention(&ere_altra_attn)) { + pr_err("can't register driver\n"); + return -ENODEV; + } + + return 0; +} + +module_init(acpiphp_ampere_altra_init); + +static void __exit acpiphp_ampere_altra_exit(void) +{ + acpiphp_unregister_attention(&ere_altra_attn); +} + +module_exit(acpiphp_ampere_altra_exit); + +MODULE_AUTHOR("D Scott Phillips "); +MODULE_LICENSE("GPL");