grackle.c 1.8 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162
  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Functions for setting up and using a MPC106 northbridge
  4. * Extracted from arch/powerpc/platforms/powermac/pci.c.
  5. *
  6. * Copyright (C) 2003 Benjamin Herrenschmuidt ([email protected])
  7. * Copyright (C) 1997 Paul Mackerras ([email protected])
  8. */
  9. #include <linux/kernel.h>
  10. #include <linux/pci.h>
  11. #include <linux/init.h>
  12. #include <linux/of.h>
  13. #include <asm/io.h>
  14. #include <asm/pci-bridge.h>
  15. #include <asm/grackle.h>
  16. #define GRACKLE_CFA(b, d, o) (0x80 | ((b) << 8) | ((d) << 16) \
  17. | (((o) & ~3) << 24))
  18. #define GRACKLE_PICR1_STG 0x00000040
  19. #define GRACKLE_PICR1_LOOPSNOOP 0x00000010
  20. /* N.B. this is called before bridges is initialized, so we can't
  21. use grackle_pcibios_{read,write}_config_dword. */
  22. static inline void grackle_set_stg(struct pci_controller* bp, int enable)
  23. {
  24. unsigned int val;
  25. out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
  26. val = in_le32(bp->cfg_data);
  27. val = enable? (val | GRACKLE_PICR1_STG) :
  28. (val & ~GRACKLE_PICR1_STG);
  29. out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
  30. out_le32(bp->cfg_data, val);
  31. (void)in_le32(bp->cfg_data);
  32. }
  33. static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable)
  34. {
  35. unsigned int val;
  36. out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
  37. val = in_le32(bp->cfg_data);
  38. val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) :
  39. (val & ~GRACKLE_PICR1_LOOPSNOOP);
  40. out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
  41. out_le32(bp->cfg_data, val);
  42. (void)in_le32(bp->cfg_data);
  43. }
  44. void __init setup_grackle(struct pci_controller *hose)
  45. {
  46. setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
  47. if (of_machine_is_compatible("PowerMac1,1"))
  48. pci_add_flags(PCI_REASSIGN_ALL_BUS);
  49. if (of_machine_is_compatible("AAPL,PowerBook1998"))
  50. grackle_set_loop_snoop(hose, 1);
  51. #if 0 /* Disabled for now, HW problems ??? */
  52. grackle_set_stg(hose, 1);
  53. #endif
  54. }