1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_PARISC_PCI_H
3 #define __ASM_PARISC_PCI_H
4
5 #include <linux/scatterlist.h>
6
7
8
9 /*
10 ** HP PCI platforms generally support multiple bus adapters.
11 ** (workstations 1-~4, servers 2-~32)
12 **
13 ** Newer platforms number the busses across PCI bus adapters *sparsely*.
14 ** E.g. 0, 8, 16, ...
15 **
16 ** Under a PCI bus, most HP platforms support PPBs up to two or three
17 ** levels deep. See "Bit3" product line.
18 */
19 #define PCI_MAX_BUSSES 256
20
21
22 /* To be used as: mdelay(pci_post_reset_delay);
23 *
24 * post_reset is the time the kernel should stall to prevent anyone from
25 * accessing the PCI bus once #RESET is de-asserted.
26 * PCI spec somewhere says 1 second but with multi-PCI bus systems,
27 * this makes the boot time much longer than necessary.
28 * 20ms seems to work for all the HP PCI implementations to date.
29 */
30 #define pci_post_reset_delay 50
31
32
33 /*
34 ** pci_hba_data (aka H2P_OBJECT in HP/UX)
35 **
36 ** This is the "common" or "base" data structure which HBA drivers
37 ** (eg Dino or LBA) are required to place at the top of their own
38 ** platform_data structure. I've heard this called "C inheritance" too.
39 **
40 ** Data needed by pcibios layer belongs here.
41 */
42 struct pci_hba_data {
43 void __iomem *base_addr; /* aka Host Physical Address */
44 const struct parisc_device *dev; /* device from PA bus walk */
45 struct pci_bus *hba_bus; /* primary PCI bus below HBA */
46 int hba_num; /* I/O port space access "key" */
47 struct resource bus_num; /* PCI bus numbers */
48 struct resource io_space; /* PIOP */
49 struct resource lmmio_space; /* bus addresses < 4Gb */
50 struct resource elmmio_space; /* additional bus addresses < 4Gb */
51 struct resource gmmio_space; /* bus addresses > 4Gb */
52
53 /* NOTE: Dino code assumes it can use *all* of the lmmio_space,
54 * elmmio_space and gmmio_space as a contiguous array of
55 * resources. This #define represents the array size */
56 #define DINO_MAX_LMMIO_RESOURCES 3
57
58 unsigned long lmmio_space_offset; /* CPU view - PCI view */
59 struct ioc *iommu; /* IOMMU this device is under */
60 /* REVISIT - spinlock to protect resources? */
61
62 #define HBA_NAME_SIZE 16
63 char io_name[HBA_NAME_SIZE];
64 char lmmio_name[HBA_NAME_SIZE];
65 char elmmio_name[HBA_NAME_SIZE];
66 char gmmio_name[HBA_NAME_SIZE];
67 };
68
69 /*
70 ** We support 2^16 I/O ports per HBA. These are set up in the form
71 ** 0xbbxxxx, where bb is the bus number and xxxx is the I/O port
72 ** space address.
73 */
74 #define HBA_PORT_SPACE_BITS 16
75
76 #define HBA_PORT_BASE(h) ((h) << HBA_PORT_SPACE_BITS)
77 #define HBA_PORT_SPACE_SIZE (1UL << HBA_PORT_SPACE_BITS)
78
79 #define PCI_PORT_HBA(a) ((a) >> HBA_PORT_SPACE_BITS)
80 #define PCI_PORT_ADDR(a) ((a) & (HBA_PORT_SPACE_SIZE - 1))
81
82 #ifdef CONFIG_64BIT
83 #define PCI_F_EXTEND 0xffffffff00000000UL
84 #else /* !CONFIG_64BIT */
85 #define PCI_F_EXTEND 0UL
86 #endif /* !CONFIG_64BIT */
87
88 /*
89 ** Most PCI devices (eg Tulip, NCR720) also export the same registers
90 ** to both MMIO and I/O port space. Due to poor performance of I/O Port
91 ** access under HP PCI bus adapters, strongly recommend the use of MMIO
92 ** address space.
93 **
94 ** While I'm at it more PA programming notes:
95 **
96 ** 1) MMIO stores (writes) are posted operations. This means the processor
97 ** gets an "ACK" before the write actually gets to the device. A read
98 ** to the same device (or typically the bus adapter above it) will
99 ** force in-flight write transaction(s) out to the targeted device
100 ** before the read can complete.
101 **
102 ** 2) The Programmed I/O (PIO) data may not always be strongly ordered with
103 ** respect to DMA on all platforms. Ie PIO data can reach the processor
104 ** before in-flight DMA reaches memory. Since most SMP PA platforms
105 ** are I/O coherent, it generally doesn't matter...but sometimes
106 ** it does.
107 **
108 ** I've helped device driver writers debug both types of problems.
109 */
110 struct pci_port_ops {
111 u8 (*inb) (struct pci_hba_data *hba, u16 port);
112 u16 (*inw) (struct pci_hba_data *hba, u16 port);
113 u32 (*inl) (struct pci_hba_data *hba, u16 port);
114 void (*outb) (struct pci_hba_data *hba, u16 port, u8 data);
115 void (*outw) (struct pci_hba_data *hba, u16 port, u16 data);
116 void (*outl) (struct pci_hba_data *hba, u16 port, u32 data);
117 };
118
119
120 struct pci_bios_ops {
121 void (*init)(void);
122 void (*fixup_bus)(struct pci_bus *bus);
123 };
124
125 /*
126 ** Stuff declared in arch/parisc/kernel/pci.c
127 */
128 extern struct pci_port_ops *pci_port;
129 extern struct pci_bios_ops *pci_bios;
130
131 #ifdef CONFIG_PCI
132 extern void pcibios_register_hba(struct pci_hba_data *);
133 #else
134 static inline void pcibios_register_hba(struct pci_hba_data *x)
135 {
136 }
137 #endif
138 extern void pcibios_init_bridge(struct pci_dev *);
139
140 /*
141 * pcibios_assign_all_busses() is used in drivers/pci/pci.c:pci_do_scan_bus()
142 * 0 == check if bridge is numbered before re-numbering.
143 * 1 == pci_do_scan_bus() should automatically number all PCI-PCI bridges.
144 *
145 * We *should* set this to zero for "legacy" platforms and one
146 * for PAT platforms.
147 *
148 * But legacy platforms also need to renumber the busses below a Host
149 * Bus controller. Adding a 4-port Tulip card on the first PCI root
150 * bus of a C200 resulted in the secondary bus being numbered as 1.
151 * The second PCI host bus controller's root bus had already been
152 * assigned bus number 1 by firmware and sysfs complained.
153 *
154 * Firmware isn't doing anything wrong here since each controller
155 * is its own PCI domain. It's simpler and easier for us to renumber
156 * the busses rather than treat each Dino as a separate PCI domain.
157 * Eventually, we may want to introduce PCI domains for Superdome or
158 * rp7420/8420 boxes and then revisit this issue.
159 */
160 #define pcibios_assign_all_busses() (1)
161
162 #define PCIBIOS_MIN_IO 0x10
163 #define PCIBIOS_MIN_MEM 0x1000 /* NBPG - but pci/setup-res.c dies */
164
165 #define HAVE_PCI_MMAP
166 #define ARCH_GENERIC_PCI_MMAP_RESOURCE
167
168 #endif /* __ASM_PARISC_PCI_H */
169
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