phy-bcm-kona-usb2.c 3.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147
  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver
  4. *
  5. * Copyright (C) 2013 Linaro Limited
  6. * Matt Porter <mporter@linaro.org>
  7. */
  8. #include <linux/clk.h>
  9. #include <linux/delay.h>
  10. #include <linux/err.h>
  11. #include <linux/io.h>
  12. #include <linux/module.h>
  13. #include <linux/of.h>
  14. #include <linux/phy/phy.h>
  15. #include <linux/platform_device.h>
  16. #define OTGCTL (0)
  17. #define OTGCTL_OTGSTAT2 BIT(31)
  18. #define OTGCTL_OTGSTAT1 BIT(30)
  19. #define OTGCTL_PRST_N_SW BIT(11)
  20. #define OTGCTL_HRESET_N BIT(10)
  21. #define OTGCTL_UTMI_LINE_STATE1 BIT(9)
  22. #define OTGCTL_UTMI_LINE_STATE0 BIT(8)
  23. #define P1CTL (8)
  24. #define P1CTL_SOFT_RESET BIT(1)
  25. #define P1CTL_NON_DRIVING BIT(0)
  26. struct bcm_kona_usb {
  27. void __iomem *regs;
  28. };
  29. static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on)
  30. {
  31. u32 val;
  32. val = readl(phy->regs + OTGCTL);
  33. if (on) {
  34. /* Configure and power PHY */
  35. val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 |
  36. OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0);
  37. val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N;
  38. } else {
  39. val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N);
  40. }
  41. writel(val, phy->regs + OTGCTL);
  42. }
  43. static int bcm_kona_usb_phy_init(struct phy *gphy)
  44. {
  45. struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
  46. u32 val;
  47. /* Soft reset PHY */
  48. val = readl(phy->regs + P1CTL);
  49. val &= ~P1CTL_NON_DRIVING;
  50. val |= P1CTL_SOFT_RESET;
  51. writel(val, phy->regs + P1CTL);
  52. writel(val & ~P1CTL_SOFT_RESET, phy->regs + P1CTL);
  53. /* Reset needs to be asserted for 2ms */
  54. mdelay(2);
  55. writel(val | P1CTL_SOFT_RESET, phy->regs + P1CTL);
  56. return 0;
  57. }
  58. static int bcm_kona_usb_phy_power_on(struct phy *gphy)
  59. {
  60. struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
  61. bcm_kona_usb_phy_power(phy, 1);
  62. return 0;
  63. }
  64. static int bcm_kona_usb_phy_power_off(struct phy *gphy)
  65. {
  66. struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
  67. bcm_kona_usb_phy_power(phy, 0);
  68. return 0;
  69. }
  70. static const struct phy_ops ops = {
  71. .init = bcm_kona_usb_phy_init,
  72. .power_on = bcm_kona_usb_phy_power_on,
  73. .power_off = bcm_kona_usb_phy_power_off,
  74. .owner = THIS_MODULE,
  75. };
  76. static int bcm_kona_usb2_probe(struct platform_device *pdev)
  77. {
  78. struct device *dev = &pdev->dev;
  79. struct bcm_kona_usb *phy;
  80. struct resource *res;
  81. struct phy *gphy;
  82. struct phy_provider *phy_provider;
  83. phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
  84. if (!phy)
  85. return -ENOMEM;
  86. res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  87. phy->regs = devm_ioremap_resource(&pdev->dev, res);
  88. if (IS_ERR(phy->regs))
  89. return PTR_ERR(phy->regs);
  90. platform_set_drvdata(pdev, phy);
  91. gphy = devm_phy_create(dev, NULL, &ops);
  92. if (IS_ERR(gphy))
  93. return PTR_ERR(gphy);
  94. /* The Kona PHY supports an 8-bit wide UTMI interface */
  95. phy_set_bus_width(gphy, 8);
  96. phy_set_drvdata(gphy, phy);
  97. phy_provider = devm_of_phy_provider_register(dev,
  98. of_phy_simple_xlate);
  99. return PTR_ERR_OR_ZERO(phy_provider);
  100. }
  101. static const struct of_device_id bcm_kona_usb2_dt_ids[] = {
  102. { .compatible = "brcm,kona-usb2-phy" },
  103. { /* sentinel */ }
  104. };
  105. MODULE_DEVICE_TABLE(of, bcm_kona_usb2_dt_ids);
  106. static struct platform_driver bcm_kona_usb2_driver = {
  107. .probe = bcm_kona_usb2_probe,
  108. .driver = {
  109. .name = "bcm-kona-usb2",
  110. .of_match_table = bcm_kona_usb2_dt_ids,
  111. },
  112. };
  113. module_platform_driver(bcm_kona_usb2_driver);
  114. MODULE_ALIAS("platform:bcm-kona-usb2");
  115. MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
  116. MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver");
  117. MODULE_LICENSE("GPL v2");