1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _ASM_POWERPC_PCI_BRIDGE_H
3 #define _ASM_POWERPC_PCI_BRIDGE_H
4 #ifdef __KERNEL__
5 /*
6  */
7 #include <linux/pci.h>
8 #include <linux/list.h>
9 #include <linux/ioport.h>
10 #include <linux/numa.h>
11 
12 struct device_node;
13 
14 /*
15  * PCI controller operations
16  */
17 struct pci_controller_ops {
18 	void		(*dma_dev_setup)(struct pci_dev *pdev);
19 	void		(*dma_bus_setup)(struct pci_bus *bus);
20 	bool		(*iommu_bypass_supported)(struct pci_dev *pdev,
21 				u64 mask);
22 
23 	int		(*probe_mode)(struct pci_bus *bus);
24 
25 	/* Called when pci_enable_device() is called. Returns true to
26 	 * allow assignment/enabling of the device. */
27 	bool		(*enable_device_hook)(struct pci_dev *pdev);
28 
29 	void		(*disable_device)(struct pci_dev *pdev);
30 
31 	void		(*release_device)(struct pci_dev *pdev);
32 
33 	/* Called during PCI resource reassignment */
34 	resource_size_t (*window_alignment)(struct pci_bus *bus,
35 					    unsigned long type);
36 	void		(*setup_bridge)(struct pci_bus *bus,
37 					unsigned long type);
38 	void		(*reset_secondary_bus)(struct pci_dev *pdev);
39 
40 #ifdef CONFIG_PCI_MSI
41 	int		(*setup_msi_irqs)(struct pci_dev *pdev,
42 					  int nvec, int type);
43 	void		(*teardown_msi_irqs)(struct pci_dev *pdev);
44 #endif
45 
46 	void		(*shutdown)(struct pci_controller *hose);
47 };
48 
49 /*
50  * Structure of a PCI controller (host bridge)
51  */
52 struct pci_controller {
53 	struct pci_bus *bus;
54 	char is_dynamic;
55 #ifdef CONFIG_PPC64
56 	int node;
57 #endif
58 	struct device_node *dn;
59 	struct list_head list_node;
60 	struct device *parent;
61 
62 	int first_busno;
63 	int last_busno;
64 	int self_busno;
65 	struct resource busn;
66 
67 	void __iomem *io_base_virt;
68 #ifdef CONFIG_PPC64
69 	void __iomem *io_base_alloc;
70 #endif
71 	resource_size_t io_base_phys;
72 	resource_size_t pci_io_size;
73 
74 	/* Some machines have a special region to forward the ISA
75 	 * "memory" cycles such as VGA memory regions. Left to 0
76 	 * if unsupported
77 	 */
78 	resource_size_t	isa_mem_phys;
79 	resource_size_t	isa_mem_size;
80 
81 	struct pci_controller_ops controller_ops;
82 	struct pci_ops *ops;
83 	unsigned int __iomem *cfg_addr;
84 	void __iomem *cfg_data;
85 
86 	/*
87 	 * Used for variants of PCI indirect handling and possible quirks:
88 	 *  SET_CFG_TYPE - used on 4xx or any PHB that does explicit type0/1
89 	 *  EXT_REG - provides access to PCI-e extended registers
90 	 *  SURPRESS_PRIMARY_BUS - we suppress the setting of PCI_PRIMARY_BUS
91 	 *   on Freescale PCI-e controllers since they used the PCI_PRIMARY_BUS
92 	 *   to determine which bus number to match on when generating type0
93 	 *   config cycles
94 	 *  NO_PCIE_LINK - the Freescale PCI-e controllers have issues with
95 	 *   hanging if we don't have link and try to do config cycles to
96 	 *   anything but the PHB.  Only allow talking to the PHB if this is
97 	 *   set.
98 	 *  BIG_ENDIAN - cfg_addr is a big endian register
99 	 *  BROKEN_MRM - the 440EPx/GRx chips have an errata that causes hangs on
100 	 *   the PLB4.  Effectively disable MRM commands by setting this.
101 	 *  FSL_CFG_REG_LINK - Freescale controller version in which the PCIe
102 	 *   link status is in a RC PCIe cfg register (vs being a SoC register)
103 	 */
104 #define PPC_INDIRECT_TYPE_SET_CFG_TYPE		0x00000001
105 #define PPC_INDIRECT_TYPE_EXT_REG		0x00000002
106 #define PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS	0x00000004
107 #define PPC_INDIRECT_TYPE_NO_PCIE_LINK		0x00000008
108 #define PPC_INDIRECT_TYPE_BIG_ENDIAN		0x00000010
109 #define PPC_INDIRECT_TYPE_BROKEN_MRM		0x00000020
110 #define PPC_INDIRECT_TYPE_FSL_CFG_REG_LINK	0x00000040
111 	u32 indirect_type;
112 	/* Currently, we limit ourselves to 1 IO range and 3 mem
113 	 * ranges since the common pci_bus structure can't handle more
114 	 */
115 	struct resource	io_resource;
116 	struct resource mem_resources[3];
117 	resource_size_t mem_offset[3];
118 	int global_number;		/* PCI domain number */
119 
120 	resource_size_t dma_window_base_cur;
121 	resource_size_t dma_window_size;
122 
123 #ifdef CONFIG_PPC64
124 	unsigned long buid;
125 	struct pci_dn *pci_data;
126 #endif	/* CONFIG_PPC64 */
127 
128 	void *private_data;
129 
130 	/* IRQ domain hierarchy */
131 	struct irq_domain	*dev_domain;
132 	struct irq_domain	*msi_domain;
133 	struct fwnode_handle	*fwnode;
134 };
135 
136 /* These are used for config access before all the PCI probing
137    has been done. */
138 extern int early_read_config_byte(struct pci_controller *hose, int bus,
139 			int dev_fn, int where, u8 *val);
140 extern int early_read_config_word(struct pci_controller *hose, int bus,
141 			int dev_fn, int where, u16 *val);
142 extern int early_read_config_dword(struct pci_controller *hose, int bus,
143 			int dev_fn, int where, u32 *val);
144 extern int early_write_config_byte(struct pci_controller *hose, int bus,
145 			int dev_fn, int where, u8 val);
146 extern int early_write_config_word(struct pci_controller *hose, int bus,
147 			int dev_fn, int where, u16 val);
148 extern int early_write_config_dword(struct pci_controller *hose, int bus,
149 			int dev_fn, int where, u32 val);
150 
151 extern int early_find_capability(struct pci_controller *hose, int bus,
152 				 int dev_fn, int cap);
153 
154 extern void setup_indirect_pci(struct pci_controller* hose,
155 			       resource_size_t cfg_addr,
156 			       resource_size_t cfg_data, u32 flags);
157 
158 extern int indirect_read_config(struct pci_bus *bus, unsigned int devfn,
159 				int offset, int len, u32 *val);
160 
161 extern int __indirect_read_config(struct pci_controller *hose,
162 				  unsigned char bus_number, unsigned int devfn,
163 				  int offset, int len, u32 *val);
164 
165 extern int indirect_write_config(struct pci_bus *bus, unsigned int devfn,
166 				 int offset, int len, u32 val);
167 
pci_bus_to_host(const struct pci_bus * bus)168 static inline struct pci_controller *pci_bus_to_host(const struct pci_bus *bus)
169 {
170 	return bus->sysdata;
171 }
172 
173 #ifndef CONFIG_PPC64
174 
175 extern int pci_device_from_OF_node(struct device_node *node,
176 				   u8 *bus, u8 *devfn);
177 extern void pci_create_OF_bus_map(void);
178 
179 #else	/* CONFIG_PPC64 */
180 
181 /*
182  * PCI stuff, for nodes representing PCI devices, pointed to
183  * by device_node->data.
184  */
185 struct iommu_table;
186 
187 struct pci_dn {
188 	int     flags;
189 #define PCI_DN_FLAG_IOV_VF	0x01
190 #define PCI_DN_FLAG_DEAD	0x02    /* Device has been hot-removed */
191 
192 	int	busno;			/* pci bus number */
193 	int	devfn;			/* pci device and function number */
194 	int	vendor_id;		/* Vendor ID */
195 	int	device_id;		/* Device ID */
196 	int	class_code;		/* Device class code */
197 
198 	struct  pci_dn *parent;
199 	struct  pci_controller *phb;	/* for pci devices */
200 	struct	iommu_table_group *table_group;	/* for phb's or bridges */
201 
202 	int	pci_ext_config_space;	/* for pci devices */
203 #ifdef CONFIG_EEH
204 	struct eeh_dev *edev;		/* eeh device */
205 #endif
206 #define IODA_INVALID_PE		0xFFFFFFFF
207 	unsigned int pe_number;
208 #ifdef CONFIG_PCI_IOV
209 	u16     vfs_expanded;		/* number of VFs IOV BAR expanded */
210 	u16     num_vfs;		/* number of VFs enabled*/
211 	unsigned int *pe_num_map;	/* PE# for the first VF PE or array */
212 	bool    m64_single_mode;	/* Use M64 BAR in Single Mode */
213 #define IODA_INVALID_M64        (-1)
214 	int     (*m64_map)[PCI_SRIOV_NUM_BARS];	/* Only used on powernv */
215 	int     last_allow_rc;			/* Only used on pseries */
216 #endif /* CONFIG_PCI_IOV */
217 	int	mps;			/* Maximum Payload Size */
218 	struct list_head child_list;
219 	struct list_head list;
220 	struct resource holes[PCI_SRIOV_NUM_BARS];
221 };
222 
223 /* Get the pointer to a device_node's pci_dn */
224 #define PCI_DN(dn)	((struct pci_dn *) (dn)->data)
225 
226 extern struct pci_dn *pci_get_pdn_by_devfn(struct pci_bus *bus,
227 					   int devfn);
228 extern struct pci_dn *pci_get_pdn(struct pci_dev *pdev);
229 extern struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
230 					       struct device_node *dn);
231 extern void pci_remove_device_node_info(struct device_node *dn);
232 
233 #ifdef CONFIG_PCI_IOV
234 struct pci_dn *add_sriov_vf_pdns(struct pci_dev *pdev);
235 void remove_sriov_vf_pdns(struct pci_dev *pdev);
236 #endif
237 
pci_device_from_OF_node(struct device_node * np,u8 * bus,u8 * devfn)238 static inline int pci_device_from_OF_node(struct device_node *np,
239 					  u8 *bus, u8 *devfn)
240 {
241 	if (!PCI_DN(np))
242 		return -ENODEV;
243 	*bus = PCI_DN(np)->busno;
244 	*devfn = PCI_DN(np)->devfn;
245 	return 0;
246 }
247 
248 #if defined(CONFIG_EEH)
pdn_to_eeh_dev(struct pci_dn * pdn)249 static inline struct eeh_dev *pdn_to_eeh_dev(struct pci_dn *pdn)
250 {
251 	return pdn ? pdn->edev : NULL;
252 }
253 #else
254 #define pdn_to_eeh_dev(x)	(NULL)
255 #endif
256 
257 /** Find the bus corresponding to the indicated device node */
258 extern struct pci_bus *pci_find_bus_by_node(struct device_node *dn);
259 
260 /** Remove all of the PCI devices under this bus */
261 extern void pci_hp_remove_devices(struct pci_bus *bus);
262 
263 /** Discover new pci devices under this bus, and add them */
264 extern void pci_hp_add_devices(struct pci_bus *bus);
265 
266 extern int pcibios_unmap_io_space(struct pci_bus *bus);
267 extern int pcibios_map_io_space(struct pci_bus *bus);
268 
269 #ifdef CONFIG_NUMA
270 #define PHB_SET_NODE(PHB, NODE)		((PHB)->node = (NODE))
271 #else
272 #define PHB_SET_NODE(PHB, NODE)		((PHB)->node = NUMA_NO_NODE)
273 #endif
274 
275 #endif	/* CONFIG_PPC64 */
276 
277 /* Get the PCI host controller for an OF device */
278 extern struct pci_controller *pci_find_hose_for_OF_device(
279 			struct device_node* node);
280 
281 extern struct pci_controller *pci_find_controller_for_domain(int domain_nr);
282 
283 /* Fill up host controller resources from the OF node */
284 extern void pci_process_bridge_OF_ranges(struct pci_controller *hose,
285 			struct device_node *dev, int primary);
286 
287 /* Allocate & free a PCI host bridge structure */
288 extern struct pci_controller *pcibios_alloc_controller(struct device_node *dev);
289 extern void pcibios_free_controller(struct pci_controller *phb);
290 extern void pcibios_free_controller_deferred(struct pci_host_bridge *bridge);
291 
292 #ifdef CONFIG_PCI
293 extern int pcibios_vaddr_is_ioport(void __iomem *address);
294 #else
pcibios_vaddr_is_ioport(void __iomem * address)295 static inline int pcibios_vaddr_is_ioport(void __iomem *address)
296 {
297 	return 0;
298 }
299 #endif	/* CONFIG_PCI */
300 
301 #endif	/* __KERNEL__ */
302 #endif	/* _ASM_POWERPC_PCI_BRIDGE_H */
303