omap-ulpi-viewport.c 1.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * OMAP ulpi viewport support
  4. * Based on drivers/usb/ulpi/ulpi-viewport.c
  5. *
  6. * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
  7. * Author: Govindraj R <govindraj.raja@ti.com>
  8. */
  9. #include <common.h>
  10. #include <asm/io.h>
  11. #include <usb/ulpi.h>
  12. #define OMAP_ULPI_WR_OPSEL (2 << 22)
  13. #define OMAP_ULPI_RD_OPSEL (3 << 22)
  14. #define OMAP_ULPI_START (1 << 31)
  15. /*
  16. * Wait for having ulpi in done state
  17. */
  18. static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
  19. {
  20. int timeout = CONFIG_USB_ULPI_TIMEOUT;
  21. while (--timeout) {
  22. if (!(readl(ulpi_vp->viewport_addr) & mask))
  23. return 0;
  24. udelay(1);
  25. }
  26. return ULPI_ERROR;
  27. }
  28. /*
  29. * Issue a ULPI read/write request
  30. */
  31. static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
  32. {
  33. int err;
  34. writel(value, ulpi_vp->viewport_addr);
  35. err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
  36. if (err)
  37. debug("ULPI request timed out\n");
  38. return err;
  39. }
  40. int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
  41. {
  42. u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
  43. OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
  44. return ulpi_request(ulpi_vp, val);
  45. }
  46. u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
  47. {
  48. int err;
  49. u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
  50. OMAP_ULPI_RD_OPSEL | ((u32)reg << 16);
  51. err = ulpi_request(ulpi_vp, val);
  52. if (err)
  53. return err;
  54. return readl(ulpi_vp->viewport_addr) & 0xff;
  55. }