[PATCH] PCI: hotplug: Add extension driver for Ampere Altra hotplug LED control

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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 <scott@xxxxxxxxxxxxxxxxxxxxxx>
---
 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 <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.h>
+
+#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(&ampere_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(&ampere_altra_attn);
+}
+
+module_exit(acpiphp_ampere_altra_exit);
+
+MODULE_AUTHOR("D Scott Phillips <scott@xxxxxxxxxxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
-- 
2.41.0





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