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