amd.c 2.3 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Driver for AMD am79c PHYs
  4. *
  5. * Author: Heiko Schocher <[email protected]>
  6. *
  7. * Copyright (c) 2011 DENX Software Engineering GmbH
  8. */
  9. #include <linux/kernel.h>
  10. #include <linux/errno.h>
  11. #include <linux/init.h>
  12. #include <linux/module.h>
  13. #include <linux/mii.h>
  14. #include <linux/phy.h>
  15. #define PHY_ID_AM79C874 0x0022561b
  16. #define MII_AM79C_IR 17 /* Interrupt Status/Control Register */
  17. #define MII_AM79C_IR_EN_LINK 0x0400 /* IR enable Linkstate */
  18. #define MII_AM79C_IR_EN_ANEG 0x0100 /* IR enable Aneg Complete */
  19. #define MII_AM79C_IR_IMASK_INIT (MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG)
  20. #define MII_AM79C_IR_LINK_DOWN BIT(2)
  21. #define MII_AM79C_IR_ANEG_DONE BIT(0)
  22. #define MII_AM79C_IR_IMASK_STAT (MII_AM79C_IR_LINK_DOWN | MII_AM79C_IR_ANEG_DONE)
  23. MODULE_DESCRIPTION("AMD PHY driver");
  24. MODULE_AUTHOR("Heiko Schocher <[email protected]>");
  25. MODULE_LICENSE("GPL");
  26. static int am79c_ack_interrupt(struct phy_device *phydev)
  27. {
  28. int err;
  29. err = phy_read(phydev, MII_BMSR);
  30. if (err < 0)
  31. return err;
  32. err = phy_read(phydev, MII_AM79C_IR);
  33. if (err < 0)
  34. return err;
  35. return 0;
  36. }
  37. static int am79c_config_init(struct phy_device *phydev)
  38. {
  39. return 0;
  40. }
  41. static int am79c_config_intr(struct phy_device *phydev)
  42. {
  43. int err;
  44. if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
  45. err = am79c_ack_interrupt(phydev);
  46. if (err)
  47. return err;
  48. err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT);
  49. } else {
  50. err = phy_write(phydev, MII_AM79C_IR, 0);
  51. if (err)
  52. return err;
  53. err = am79c_ack_interrupt(phydev);
  54. }
  55. return err;
  56. }
  57. static irqreturn_t am79c_handle_interrupt(struct phy_device *phydev)
  58. {
  59. int irq_status;
  60. irq_status = phy_read(phydev, MII_AM79C_IR);
  61. if (irq_status < 0) {
  62. phy_error(phydev);
  63. return IRQ_NONE;
  64. }
  65. if (!(irq_status & MII_AM79C_IR_IMASK_STAT))
  66. return IRQ_NONE;
  67. phy_trigger_machine(phydev);
  68. return IRQ_HANDLED;
  69. }
  70. static struct phy_driver am79c_driver[] = { {
  71. .phy_id = PHY_ID_AM79C874,
  72. .name = "AM79C874",
  73. .phy_id_mask = 0xfffffff0,
  74. /* PHY_BASIC_FEATURES */
  75. .config_init = am79c_config_init,
  76. .config_intr = am79c_config_intr,
  77. .handle_interrupt = am79c_handle_interrupt,
  78. } };
  79. module_phy_driver(am79c_driver);
  80. static struct mdio_device_id __maybe_unused amd_tbl[] = {
  81. { PHY_ID_AM79C874, 0xfffffff0 },
  82. { }
  83. };
  84. MODULE_DEVICE_TABLE(mdio, amd_tbl);