1 #ifndef __ASM_PARISC_PCI_H
2 #define __ASM_PARISC_PCI_H
4 #include <asm/scatterlist.h>
9 ** HP PCI platforms generally support multiple bus adapters.
10 ** (workstations 1-~4, servers 2-~32)
12 ** Newer platforms number the busses across PCI bus adapters *sparsely*.
15 ** Under a PCI bus, most HP platforms support PPBs up to two or three
16 ** levels deep. See "Bit3" product line.
18 #define PCI_MAX_BUSSES 256
21 /* To be used as: mdelay(pci_post_reset_delay);
23 * post_reset is the time the kernel should stall to prevent anyone from
24 * accessing the PCI bus once #RESET is de-asserted.
25 * PCI spec somewhere says 1 second but with multi-PCI bus systems,
26 * this makes the boot time much longer than necessary.
27 * 20ms seems to work for all the HP PCI implementations to date.
29 #define pci_post_reset_delay 50
33 ** pci_hba_data (aka H2P_OBJECT in HP/UX)
35 ** This is the "common" or "base" data structure which HBA drivers
36 ** (eg Dino or LBA) are required to place at the top of their own
37 ** platform_data structure. I've heard this called "C inheritance" too.
39 ** Data needed by pcibios layer belongs here.
42 void __iomem *base_addr; /* aka Host Physical Address */
43 const struct parisc_device *dev; /* device from PA bus walk */
44 struct pci_bus *hba_bus; /* primary PCI bus below HBA */
45 int hba_num; /* I/O port space access "key" */
46 struct resource bus_num; /* PCI bus numbers */
47 struct resource io_space; /* PIOP */
48 struct resource lmmio_space; /* bus addresses < 4Gb */
49 struct resource elmmio_space; /* additional bus addresses < 4Gb */
50 struct resource gmmio_space; /* bus addresses > 4Gb */
52 /* NOTE: Dino code assumes it can use *all* of the lmmio_space,
53 * elmmio_space and gmmio_space as a contiguous array of
54 * resources. This #define represents the array size */
55 #define DINO_MAX_LMMIO_RESOURCES 3
57 unsigned long lmmio_space_offset; /* CPU view - PCI view */
58 void * iommu; /* IOMMU this device is under */
59 /* REVISIT - spinlock to protect resources? */
61 #define HBA_NAME_SIZE 16
62 char io_name[HBA_NAME_SIZE];
63 char lmmio_name[HBA_NAME_SIZE];
64 char elmmio_name[HBA_NAME_SIZE];
65 char gmmio_name[HBA_NAME_SIZE];
68 #define HBA_DATA(d) ((struct pci_hba_data *) (d))
71 ** We support 2^16 I/O ports per HBA. These are set up in the form
72 ** 0xbbxxxx, where bb is the bus number and xxxx is the I/O port
75 #define HBA_PORT_SPACE_BITS 16
77 #define HBA_PORT_BASE(h) ((h) << HBA_PORT_SPACE_BITS)
78 #define HBA_PORT_SPACE_SIZE (1UL << HBA_PORT_SPACE_BITS)
80 #define PCI_PORT_HBA(a) ((a) >> HBA_PORT_SPACE_BITS)
81 #define PCI_PORT_ADDR(a) ((a) & (HBA_PORT_SPACE_SIZE - 1))
84 #define PCI_F_EXTEND 0xffffffff00000000UL
85 #define PCI_IS_LMMIO(hba,a) pci_is_lmmio(hba,a)
87 /* We need to know if an address is LMMMIO or GMMIO.
88 * LMMIO requires mangling and GMMIO we must use as-is.
90 static __inline__ int pci_is_lmmio(struct pci_hba_data *hba, unsigned long a)
92 return(((a) & PCI_F_EXTEND) == PCI_F_EXTEND);
96 ** Convert between PCI (IO_VIEW) addresses and processor (PA_VIEW) addresses.
97 ** See pci.c for more conversions used by Generic PCI code.
99 ** Platform characteristics/firmware guarantee that
100 ** (1) PA_VIEW - IO_VIEW = lmmio_offset for both LMMIO and ELMMIO
101 ** (2) PA_VIEW == IO_VIEW for GMMIO
103 #define PCI_BUS_ADDR(hba,a) (PCI_IS_LMMIO(hba,a) \
104 ? ((a) - hba->lmmio_space_offset) /* mangle LMMIO */ \
106 #define PCI_HOST_ADDR(hba,a) (((a) & PCI_F_EXTEND) == 0 \
107 ? (a) + hba->lmmio_space_offset \
110 #else /* !CONFIG_64BIT */
112 #define PCI_BUS_ADDR(hba,a) (a)
113 #define PCI_HOST_ADDR(hba,a) (a)
114 #define PCI_F_EXTEND 0UL
115 #define PCI_IS_LMMIO(hba,a) (1) /* 32-bit doesn't support GMMIO */
117 #endif /* !CONFIG_64BIT */
120 ** KLUGE: linux/pci.h include asm/pci.h BEFORE declaring struct pci_bus
121 ** (This eliminates some of the warnings).
127 * If the PCI device's view of memory is the same as the CPU's view of memory,
128 * PCI_DMA_BUS_IS_PHYS is true. The networking and block device layers use
129 * this boolean for bounce buffer decisions.
132 /* All PA-2.0 machines have an IOMMU. */
133 #define PCI_DMA_BUS_IS_PHYS 0
134 #define parisc_has_iommu() do { } while (0)
137 #if defined(CONFIG_IOMMU_CCIO) || defined(CONFIG_IOMMU_SBA)
138 extern int parisc_bus_is_phys; /* in arch/parisc/kernel/setup.c */
139 #define PCI_DMA_BUS_IS_PHYS parisc_bus_is_phys
140 #define parisc_has_iommu() do { parisc_bus_is_phys = 0; } while (0)
142 #define PCI_DMA_BUS_IS_PHYS 1
143 #define parisc_has_iommu() do { } while (0)
146 #endif /* !CONFIG_PA20 */
150 ** Most PCI devices (eg Tulip, NCR720) also export the same registers
151 ** to both MMIO and I/O port space. Due to poor performance of I/O Port
152 ** access under HP PCI bus adapters, strongly recommend the use of MMIO
155 ** While I'm at it more PA programming notes:
157 ** 1) MMIO stores (writes) are posted operations. This means the processor
158 ** gets an "ACK" before the write actually gets to the device. A read
159 ** to the same device (or typically the bus adapter above it) will
160 ** force in-flight write transaction(s) out to the targeted device
161 ** before the read can complete.
163 ** 2) The Programmed I/O (PIO) data may not always be strongly ordered with
164 ** respect to DMA on all platforms. Ie PIO data can reach the processor
165 ** before in-flight DMA reaches memory. Since most SMP PA platforms
166 ** are I/O coherent, it generally doesn't matter...but sometimes
169 ** I've helped device driver writers debug both types of problems.
171 struct pci_port_ops {
172 u8 (*inb) (struct pci_hba_data *hba, u16 port);
173 u16 (*inw) (struct pci_hba_data *hba, u16 port);
174 u32 (*inl) (struct pci_hba_data *hba, u16 port);
175 void (*outb) (struct pci_hba_data *hba, u16 port, u8 data);
176 void (*outw) (struct pci_hba_data *hba, u16 port, u16 data);
177 void (*outl) (struct pci_hba_data *hba, u16 port, u32 data);
181 struct pci_bios_ops {
183 void (*fixup_bus)(struct pci_bus *bus);
186 /* pci_unmap_{single,page} is not a nop, thus... */
187 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) \
188 dma_addr_t ADDR_NAME;
189 #define DECLARE_PCI_UNMAP_LEN(LEN_NAME) \
191 #define pci_unmap_addr(PTR, ADDR_NAME) \
193 #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) \
194 (((PTR)->ADDR_NAME) = (VAL))
195 #define pci_unmap_len(PTR, LEN_NAME) \
197 #define pci_unmap_len_set(PTR, LEN_NAME, VAL) \
198 (((PTR)->LEN_NAME) = (VAL))
201 ** Stuff declared in arch/parisc/kernel/pci.c
203 extern struct pci_port_ops *pci_port;
204 extern struct pci_bios_ops *pci_bios;
207 extern void pcibios_register_hba(struct pci_hba_data *);
208 extern void pcibios_set_master(struct pci_dev *);
210 extern inline void pcibios_register_hba(struct pci_hba_data *x)
216 * pcibios_assign_all_busses() is used in drivers/pci/pci.c:pci_do_scan_bus()
217 * 0 == check if bridge is numbered before re-numbering.
218 * 1 == pci_do_scan_bus() should automatically number all PCI-PCI bridges.
220 * We *should* set this to zero for "legacy" platforms and one
223 * But legacy platforms also need to renumber the busses below a Host
224 * Bus controller. Adding a 4-port Tulip card on the first PCI root
225 * bus of a C200 resulted in the secondary bus being numbered as 1.
226 * The second PCI host bus controller's root bus had already been
227 * assigned bus number 1 by firmware and sysfs complained.
229 * Firmware isn't doing anything wrong here since each controller
230 * is its own PCI domain. It's simpler and easier for us to renumber
231 * the busses rather than treat each Dino as a separate PCI domain.
232 * Eventually, we may want to introduce PCI domains for Superdome or
233 * rp7420/8420 boxes and then revisit this issue.
235 #define pcibios_assign_all_busses() (1)
236 #define pcibios_scan_all_fns(a, b) (0)
238 #define PCIBIOS_MIN_IO 0x10
239 #define PCIBIOS_MIN_MEM 0x1000 /* NBPG - but pci/setup-res.c dies */
241 /* Don't support DAC yet. */
242 #define pci_dac_dma_supported(pci_dev, mask) (0)
244 /* export the pci_ DMA API in terms of the dma_ one */
245 #include <asm-generic/pci-dma-compat.h>
248 static inline void pci_dma_burst_advice(struct pci_dev *pdev,
249 enum pci_dma_burst_strategy *strat,
250 unsigned long *strategy_parameter)
252 unsigned long cacheline_size;
255 pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte);
257 cacheline_size = 1024;
259 cacheline_size = (int) byte * 4;
261 *strat = PCI_DMA_BURST_MULTIPLE;
262 *strategy_parameter = cacheline_size;
267 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
268 struct resource *res);
271 pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
272 struct pci_bus_region *region);
274 static inline struct resource *
275 pcibios_select_root(struct pci_dev *pdev, struct resource *res)
277 struct resource *root = NULL;
279 if (res->flags & IORESOURCE_IO)
280 root = &ioport_resource;
281 if (res->flags & IORESOURCE_MEM)
282 root = &iomem_resource;
287 static inline void pcibios_add_platform_entries(struct pci_dev *dev)
291 static inline void pcibios_penalize_isa_irq(int irq, int active)
293 /* We don't need to penalize isa irq's */
296 static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
298 return channel ? 15 : 14;
301 #endif /* __ASM_PARISC_PCI_H */