arch/parisc/include/asm/pci.h

   1 #ifndef __ASM_PARISC_PCI_H
   2 #define __ASM_PARISC_PCI_H
   3
   4 #include <asm/scatterlist.h>
   5
   6
   7
   8 /*
   9 ** HP PCI platforms generally support multiple bus adapters.
  10 **    (workstations 1-~4, servers 2-~32)
  11 **
  12 ** Newer platforms number the busses across PCI bus adapters *sparsely*.
  13 ** E.g. 0, 8, 16, ...
  14 **
  15 ** Under a PCI bus, most HP platforms support PPBs up to two or three
  16 ** levels deep. See "Bit3" product line.
  17 */
  18 #define PCI_MAX_BUSSES  256
  19
  20
  21 /* To be used as: mdelay(pci_post_reset_delay);
  22  *
  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.
  28  */
  29 #define pci_post_reset_delay 50
  30
  31
  32 /*
  33 ** pci_hba_data (aka H2P_OBJECT in HP/UX)
  34 **
  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.
  38 **
  39 ** Data needed by pcibios layer belongs here.
  40 */
  41 struct pci_hba_data {
  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 */
  51
  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
  56
  57         unsigned long   lmmio_space_offset;  /* CPU view - PCI view */
  58         void *          iommu;          /* IOMMU this device is under */
  59         /* REVISIT - spinlock to protect resources? */
  60
  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];
  66 };
  67
  68 #define HBA_DATA(d)             ((struct pci_hba_data *) (d))
  69
  70 /*
  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
  73 ** space address.
  74 */
  75 #define HBA_PORT_SPACE_BITS     16
  76
  77 #define HBA_PORT_BASE(h)        ((h) << HBA_PORT_SPACE_BITS)
  78 #define HBA_PORT_SPACE_SIZE     (1UL << HBA_PORT_SPACE_BITS)
  79
  80 #define PCI_PORT_HBA(a)         ((a) >> HBA_PORT_SPACE_BITS)
  81 #define PCI_PORT_ADDR(a)        ((a) & (HBA_PORT_SPACE_SIZE - 1))
  82
  83 #ifdef CONFIG_64BIT
  84 #define PCI_F_EXTEND            0xffffffff00000000UL
  85 #define PCI_IS_LMMIO(hba,a)     pci_is_lmmio(hba,a)
  86
  87 /* We need to know if an address is LMMMIO or GMMIO.
  88  * LMMIO requires mangling and GMMIO we must use as-is.
  89  */
  90 static __inline__  int pci_is_lmmio(struct pci_hba_data *hba, unsigned long a)
  91 {
  92         return(((a) & PCI_F_EXTEND) == PCI_F_EXTEND);
  93 }
  94
  95 /*
  96 ** Convert between PCI (IO_VIEW) addresses and processor (PA_VIEW) addresses.
  97 ** See pci.c for more conversions used by Generic PCI code.
  98 **
  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
 102 */
 103 #define PCI_BUS_ADDR(hba,a)     (PCI_IS_LMMIO(hba,a)    \
 104                 ?  ((a) - hba->lmmio_space_offset)      /* mangle LMMIO */ \
 105                 : (a))                                  /* GMMIO */
 106 #define PCI_HOST_ADDR(hba,a)    (((a) & PCI_F_EXTEND) == 0 \
 107                 ? (a) + hba->lmmio_space_offset \
 108                 : (a))
 109
 110 #else   /* !CONFIG_64BIT */
 111
 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 */
 116
 117 #endif /* !CONFIG_64BIT */
 118
 119 /*
 120 ** KLUGE: linux/pci.h include asm/pci.h BEFORE declaring struct pci_bus
 121 ** (This eliminates some of the warnings).
 122 */
 123 struct pci_bus;
 124 struct pci_dev;
 125
 126 /*
 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.
 130  */
 131 #ifdef CONFIG_PA20
 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)
 135 #else
 136
 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)
 141 #else
 142 #define PCI_DMA_BUS_IS_PHYS     1
 143 #define parisc_has_iommu()      do { } while (0)
 144 #endif
 145
 146 #endif  /* !CONFIG_PA20 */
 147
 148
 149 /*
 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
 153 ** address space.
 154 **
 155 ** While I'm at it more PA programming notes:
 156 **
 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.
 162 **
 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
 167 **    it does.
 168 **
 169 ** I've helped device driver writers debug both types of problems.
 170 */
 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);
 178 };
 179
 180
 181 struct pci_bios_ops {
 182         void (*init)(void);
 183         void (*fixup_bus)(struct pci_bus *bus);
 184 };
 185
 186 /*
 187 ** Stuff declared in arch/parisc/kernel/pci.c
 188 */
 189 extern struct pci_port_ops *pci_port;
 190 extern struct pci_bios_ops *pci_bios;
 191
 192 #ifdef CONFIG_PCI
 193 extern void pcibios_register_hba(struct pci_hba_data *);
 194 extern void pcibios_set_master(struct pci_dev *);
 195 #else
 196 static inline void pcibios_register_hba(struct pci_hba_data *x)
 197 {
 198 }
 199 #endif
 200
 201 /*
 202  * pcibios_assign_all_busses() is used in drivers/pci/pci.c:pci_do_scan_bus()
 203  *   0 == check if bridge is numbered before re-numbering.
 204  *   1 == pci_do_scan_bus() should automatically number all PCI-PCI bridges.
 205  *
 206  *   We *should* set this to zero for "legacy" platforms and one
 207  *   for PAT platforms.
 208  *
 209  *   But legacy platforms also need to renumber the busses below a Host
 210  *   Bus controller.  Adding a 4-port Tulip card on the first PCI root
 211  *   bus of a C200 resulted in the secondary bus being numbered as 1.
 212  *   The second PCI host bus controller's root bus had already been
 213  *   assigned bus number 1 by firmware and sysfs complained.
 214  *
 215  *   Firmware isn't doing anything wrong here since each controller
 216  *   is its own PCI domain.  It's simpler and easier for us to renumber
 217  *   the busses rather than treat each Dino as a separate PCI domain.
 218  *   Eventually, we may want to introduce PCI domains for Superdome or
 219  *   rp7420/8420 boxes and then revisit this issue.
 220  */
 221 #define pcibios_assign_all_busses()     (1)
 222
 223 #define PCIBIOS_MIN_IO          0x10
 224 #define PCIBIOS_MIN_MEM         0x1000 /* NBPG - but pci/setup-res.c dies */
 225
 226 /* export the pci_ DMA API in terms of the dma_ one */
 227 #include <asm-generic/pci-dma-compat.h>
 228
 229 #ifdef CONFIG_PCI
 230 static inline void pci_dma_burst_advice(struct pci_dev *pdev,
 231                                         enum pci_dma_burst_strategy *strat,
 232                                         unsigned long *strategy_parameter)
 233 {
 234         unsigned long cacheline_size;
 235         u8 byte;
 236
 237         pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte);
 238         if (byte == 0)
 239                 cacheline_size = 1024;
 240         else
 241                 cacheline_size = (int) byte * 4;
 242
 243         *strat = PCI_DMA_BURST_MULTIPLE;
 244         *strategy_parameter = cacheline_size;
 245 }
 246 #endif
 247
 248 extern void
 249 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 250                          struct resource *res);
 251
 252 extern void
 253 pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
 254                         struct pci_bus_region *region);
 255
 256 static inline void pcibios_penalize_isa_irq(int irq, int active)
 257 {
 258         /* We don't need to penalize isa irq's */
 259 }
 260
 261 static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
 262 {
 263         return channel ? 15 : 14;
 264 }
 265
 266 #endif /* __ASM_PARISC_PCI_H */