Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Code borrowed from powerpc/kernel/pci-common.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) 2014 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/of_pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/pci-acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/pci-ecam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #ifdef CONFIG_ACPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * Try to assign the IRQ number when probing a new device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) int pcibios_alloc_irq(struct pci_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	if (!acpi_disabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 		acpi_pci_irq_enable(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * raw_pci_read/write - Platform-specific PCI config space access.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) int raw_pci_read(unsigned int domain, unsigned int bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		  unsigned int devfn, int reg, int len, u32 *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	struct pci_bus *b = pci_find_bus(domain, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	if (!b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		return PCIBIOS_DEVICE_NOT_FOUND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	return b->ops->read(b, devfn, reg, len, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) int raw_pci_write(unsigned int domain, unsigned int bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		unsigned int devfn, int reg, int len, u32 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct pci_bus *b = pci_find_bus(domain, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (!b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		return PCIBIOS_DEVICE_NOT_FOUND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	return b->ops->write(b, devfn, reg, len, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) #ifdef CONFIG_NUMA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) int pcibus_to_node(struct pci_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	return dev_to_node(&bus->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) EXPORT_SYMBOL(pcibus_to_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) #ifdef CONFIG_ACPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) struct acpi_pci_generic_root_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	struct acpi_pci_root_info	common;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	struct pci_config_window	*cfg;	/* config space mapping */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	struct pci_config_window *cfg = bus->sysdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	struct acpi_device *adev = to_acpi_device(cfg->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	struct acpi_pci_root *root = acpi_driver_data(adev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	return root->segment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	if (!acpi_disabled) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		struct pci_config_window *cfg = bridge->bus->sysdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		struct acpi_device *adev = to_acpi_device(cfg->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		struct device *bus_dev = &bridge->bus->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		ACPI_COMPANION_SET(&bridge->dev, adev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct resource_entry *entry, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	status = acpi_pci_probe_root_resources(ci);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		if (!(entry->res->flags & IORESOURCE_WINDOW))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			resource_list_destroy_entry(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)  * Lookup the bus range for the domain in MCFG, and set up config space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)  * mapping.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static struct pci_config_window *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	struct device *dev = &root->device->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	struct resource *bus_res = &root->secondary;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	u16 seg = root->segment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	const struct pci_ecam_ops *ecam_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	struct resource cfgres;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	struct acpi_device *adev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	struct pci_config_window *cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	adev = acpi_resource_consumer(&cfgres);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (adev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			 dev_name(&adev->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			 &cfgres);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (IS_ERR(cfg)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			PTR_ERR(cfg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	return cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /* release_info: free resources allocated by init_info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	struct acpi_pci_generic_root_info *ri;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	ri = container_of(ci, struct acpi_pci_generic_root_info, common);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	pci_ecam_free(ri->cfg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	kfree(ci->ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	kfree(ri);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /* Interface called from ACPI code to setup PCI host controller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	struct acpi_pci_generic_root_info *ri;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	struct pci_bus *bus, *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	struct acpi_pci_root_ops *root_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	struct pci_host_bridge *host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	ri = kzalloc(sizeof(*ri), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if (!ri)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	if (!root_ops) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		kfree(ri);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	ri->cfg = pci_acpi_setup_ecam_mapping(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	if (!ri->cfg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		kfree(ri);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		kfree(root_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	root_ops->release_info = pci_acpi_generic_release_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	root_ops->prepare_resources = pci_acpi_root_prepare_resources;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (!bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	/* If we must preserve the resource configuration, claim now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	host = pci_find_host_bridge(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (host->preserve_config)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		pci_bus_claim_resources(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	 * Assign whatever was left unassigned. If we didn't claim above,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	 * this will reassign everything.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	pci_assign_unassigned_root_bus_resources(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	list_for_each_entry(child, &bus->children, node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		pcie_bus_configure_settings(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	return bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) void pcibios_add_bus(struct pci_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	acpi_pci_add_bus(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) void pcibios_remove_bus(struct pci_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	acpi_pci_remove_bus(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) #endif