1 #ifndef __ASM_PARISC_PCI_H
2 #define __ASM_PARISC_PCI_H
4 #include <linux/config.h>
5 #include <asm/scatterlist.h>
10 ** HP PCI platforms generally support multiple bus adapters.
11 ** (workstations 1-~4, servers 2-~32)
13 ** Newer platforms number the busses across PCI bus adapters *sparsely*.
16 ** Under a PCI bus, most HP platforms support PPBs up to two or three
17 ** levels deep. See "Bit3" product line.
19 #define PCI_MAX_BUSSES 256
22 /* To be used as: mdelay(pci_post_reset_delay);
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.
30 #define pci_post_reset_delay 50
34 ** pci_hba_data (aka H2P_OBJECT in HP/UX)
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.
40 ** Data needed by pcibios layer belongs here.
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 */
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
58 unsigned long lmmio_space_offset; /* CPU view - PCI view */
59 void * iommu; /* IOMMU this device is under */
60 /* REVISIT - spinlock to protect resources? */
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];
69 #define HBA_DATA(d) ((struct pci_hba_data *) (d))
72 ** We support 2^16 I/O ports per HBA. These are set up in the form
73 ** 0xbbxxxx, where bb is the bus number and xxxx is the I/O port
76 #define HBA_PORT_SPACE_BITS 16
78 #define HBA_PORT_BASE(h) ((h) << HBA_PORT_SPACE_BITS)
79 #define HBA_PORT_SPACE_SIZE (1UL << HBA_PORT_SPACE_BITS)
81 #define PCI_PORT_HBA(a) ((a) >> HBA_PORT_SPACE_BITS)
82 #define PCI_PORT_ADDR(a) ((a) & (HBA_PORT_SPACE_SIZE - 1))
85 #define PCI_F_EXTEND 0xffffffff00000000UL
86 #define PCI_IS_LMMIO(hba,a) pci_is_lmmio(hba,a)
88 /* We need to know if an address is LMMMIO or GMMIO.
89 * LMMIO requires mangling and GMMIO we must use as-is.
91 static __inline__ int pci_is_lmmio(struct pci_hba_data *hba, unsigned long a)
93 return(((a) & PCI_F_EXTEND) == PCI_F_EXTEND);
97 ** Convert between PCI (IO_VIEW) addresses and processor (PA_VIEW) addresses.
98 ** See pci.c for more conversions used by Generic PCI code.
100 ** Platform characteristics/firmware guarantee that
101 ** (1) PA_VIEW - IO_VIEW = lmmio_offset for both LMMIO and ELMMIO
102 ** (2) PA_VIEW == IO_VIEW for GMMIO
104 #define PCI_BUS_ADDR(hba,a) (PCI_IS_LMMIO(hba,a) \
105 ? ((a) - hba->lmmio_space_offset) /* mangle LMMIO */ \
107 #define PCI_HOST_ADDR(hba,a) (((a) & PCI_F_EXTEND) == 0 \
108 ? (a) + hba->lmmio_space_offset \
111 #else /* !CONFIG_64BIT */
113 #define PCI_BUS_ADDR(hba,a) (a)
114 #define PCI_HOST_ADDR(hba,a) (a)
115 #define PCI_F_EXTEND 0UL
116 #define PCI_IS_LMMIO(hba,a) (1) /* 32-bit doesn't support GMMIO */
118 #endif /* !CONFIG_64BIT */
121 ** KLUGE: linux/pci.h include asm/pci.h BEFORE declaring struct pci_bus
122 ** (This eliminates some of the warnings).
128 * If the PCI device's view of memory is the same as the CPU's view of memory,
129 * PCI_DMA_BUS_IS_PHYS is true. The networking and block device layers use
130 * this boolean for bounce buffer decisions.
133 /* All PA-2.0 machines have an IOMMU. */
134 #define PCI_DMA_BUS_IS_PHYS 0
135 #define parisc_has_iommu() do { } while (0)
138 #if defined(CONFIG_IOMMU_CCIO) || defined(CONFIG_IOMMU_SBA)
139 extern int parisc_bus_is_phys; /* in arch/parisc/kernel/setup.c */
140 #define PCI_DMA_BUS_IS_PHYS parisc_bus_is_phys
141 #define parisc_has_iommu() do { parisc_bus_is_phys = 0; } while (0)
143 #define PCI_DMA_BUS_IS_PHYS 1
144 #define parisc_has_iommu() do { } while (0)
147 #endif /* !CONFIG_PA20 */
151 ** Most PCI devices (eg Tulip, NCR720) also export the same registers
152 ** to both MMIO and I/O port space. Due to poor performance of I/O Port
153 ** access under HP PCI bus adapters, strongly reccomend use of MMIO
156 ** While I'm at it more PA programming notes:
158 ** 1) MMIO stores (writes) are posted operations. This means the processor
159 ** gets an "ACK" before the write actually gets to the device. A read
160 ** to the same device (or typically the bus adapter above it) will
161 ** force in-flight write transaction(s) out to the targeted device
162 ** before the read can complete.
164 ** 2) The Programmed I/O (PIO) data may not always be strongly ordered with
165 ** respect to DMA on all platforms. Ie PIO data can reach the processor
166 ** before in-flight DMA reaches memory. Since most SMP PA platforms
167 ** are I/O coherent, it generally doesn't matter...but sometimes
170 ** I've helped device driver writers debug both types of problems.
172 struct pci_port_ops {
173 u8 (*inb) (struct pci_hba_data *hba, u16 port);
174 u16 (*inw) (struct pci_hba_data *hba, u16 port);
175 u32 (*inl) (struct pci_hba_data *hba, u16 port);
176 void (*outb) (struct pci_hba_data *hba, u16 port, u8 data);
177 void (*outw) (struct pci_hba_data *hba, u16 port, u16 data);
178 void (*outl) (struct pci_hba_data *hba, u16 port, u32 data);
182 struct pci_bios_ops {
184 void (*fixup_bus)(struct pci_bus *bus);
187 /* pci_unmap_{single,page} is not a nop, thus... */
188 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) \
189 dma_addr_t ADDR_NAME;
190 #define DECLARE_PCI_UNMAP_LEN(LEN_NAME) \
192 #define pci_unmap_addr(PTR, ADDR_NAME) \
194 #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) \
195 (((PTR)->ADDR_NAME) = (VAL))
196 #define pci_unmap_len(PTR, LEN_NAME) \
198 #define pci_unmap_len_set(PTR, LEN_NAME, VAL) \
199 (((PTR)->LEN_NAME) = (VAL))
202 ** Stuff declared in arch/parisc/kernel/pci.c
204 extern struct pci_port_ops *pci_port;
205 extern struct pci_bios_ops *pci_bios;
208 extern void pcibios_register_hba(struct pci_hba_data *);
209 extern void pcibios_set_master(struct pci_dev *);
211 extern inline void pcibios_register_hba(struct pci_hba_data *x)
217 * pcibios_assign_all_busses() is used in drivers/pci/pci.c:pci_do_scan_bus()
218 * 0 == check if bridge is numbered before re-numbering.
219 * 1 == pci_do_scan_bus() should automatically number all PCI-PCI bridges.
221 * We *should* set this to zero for "legacy" platforms and one
224 * But legacy platforms also need to renumber the busses below a Host
225 * Bus controller. Adding a 4-port Tulip card on the first PCI root
226 * bus of a C200 resulted in the secondary bus being numbered as 1.
227 * The second PCI host bus controller's root bus had already been
228 * assigned bus number 1 by firmware and sysfs complained.
230 * Firmware isn't doing anything wrong here since each controller
231 * is its own PCI domain. It's simpler and easier for us to renumber
232 * the busses rather than treat each Dino as a separate PCI domain.
233 * Eventually, we may want to introduce PCI domains for Superdome or
234 * rp7420/8420 boxes and then revisit this issue.
236 #define pcibios_assign_all_busses() (1)
237 #define pcibios_scan_all_fns(a, b) (0)
239 #define PCIBIOS_MIN_IO 0x10
240 #define PCIBIOS_MIN_MEM 0x1000 /* NBPG - but pci/setup-res.c dies */
242 /* Don't support DAC yet. */
243 #define pci_dac_dma_supported(pci_dev, mask) (0)
245 /* export the pci_ DMA API in terms of the dma_ one */
246 #include <asm-generic/pci-dma-compat.h>
249 static inline void pci_dma_burst_advice(struct pci_dev *pdev,
250 enum pci_dma_burst_strategy *strat,
251 unsigned long *strategy_parameter)
253 unsigned long cacheline_size;
256 pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte);
258 cacheline_size = 1024;
260 cacheline_size = (int) byte * 4;
262 *strat = PCI_DMA_BURST_MULTIPLE;
263 *strategy_parameter = cacheline_size;
268 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
269 struct resource *res);
272 pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
273 struct pci_bus_region *region);
275 static inline struct resource *
276 pcibios_select_root(struct pci_dev *pdev, struct resource *res)
278 struct resource *root = NULL;
280 if (res->flags & IORESOURCE_IO)
281 root = &ioport_resource;
282 if (res->flags & IORESOURCE_MEM)
283 root = &iomem_resource;
288 static inline void pcibios_add_platform_entries(struct pci_dev *dev)
292 #endif /* __ASM_PARISC_PCI_H */