zynqmp-ipi.c 3.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Xilinx Zynq MPSoC Mailbox driver
  4. *
  5. * Copyright (C) 2018-2019 Xilinx, Inc.
  6. */
  7. #include <common.h>
  8. #include <log.h>
  9. #include <asm/io.h>
  10. #include <dm.h>
  11. #include <mailbox-uclass.h>
  12. #include <dm/device_compat.h>
  13. #include <mach/sys_proto.h>
  14. #include <linux/ioport.h>
  15. #include <linux/io.h>
  16. #include <wait_bit.h>
  17. /* IPI bitmasks, register base */
  18. /* TODO: move reg base to DT */
  19. #define IPI_BIT_MASK_PMU0 0x10000
  20. #define IPI_INT_REG_BASE_APU 0xFF300000
  21. struct ipi_int_regs {
  22. u32 trig; /* 0x0 */
  23. u32 obs; /* 0x4 */
  24. u32 dummy0;
  25. u32 dummy1;
  26. u32 isr; /* 0x10 */
  27. u32 imr; /* 0x14 */
  28. u32 ier; /* 0x18 */
  29. u32 idr; /* 0x1C */
  30. };
  31. #define ipi_int_apu ((struct ipi_int_regs *)IPI_INT_REG_BASE_APU)
  32. struct zynqmp_ipi {
  33. void __iomem *local_req_regs;
  34. void __iomem *local_res_regs;
  35. void __iomem *remote_req_regs;
  36. void __iomem *remote_res_regs;
  37. };
  38. static int zynqmp_ipi_send(struct mbox_chan *chan, const void *data)
  39. {
  40. const struct zynqmp_ipi_msg *msg = (struct zynqmp_ipi_msg *)data;
  41. struct zynqmp_ipi *zynqmp = dev_get_priv(chan->dev);
  42. u32 ret;
  43. u32 *mbx = (u32 *)zynqmp->local_req_regs;
  44. for (size_t i = 0; i < msg->len; i++)
  45. writel(msg->buf[i], &mbx[i]);
  46. /* Write trigger interrupt */
  47. writel(IPI_BIT_MASK_PMU0, &ipi_int_apu->trig);
  48. /* Wait until observation bit is cleared */
  49. ret = wait_for_bit_le32(&ipi_int_apu->obs, IPI_BIT_MASK_PMU0, false,
  50. 1000, false);
  51. debug("%s, send %ld bytes\n", __func__, msg->len);
  52. return ret;
  53. };
  54. static int zynqmp_ipi_recv(struct mbox_chan *chan, void *data)
  55. {
  56. struct zynqmp_ipi_msg *msg = (struct zynqmp_ipi_msg *)data;
  57. struct zynqmp_ipi *zynqmp = dev_get_priv(chan->dev);
  58. u32 *mbx = (u32 *)zynqmp->local_res_regs;
  59. /*
  60. * PMU Firmware does not trigger IPI interrupt for API call responses so
  61. * there is no need to check ISR flags
  62. */
  63. for (size_t i = 0; i < msg->len; i++)
  64. msg->buf[i] = readl(&mbx[i]);
  65. debug("%s, recv %ld bytes\n", __func__, msg->len);
  66. return 0;
  67. };
  68. static int zynqmp_ipi_probe(struct udevice *dev)
  69. {
  70. struct zynqmp_ipi *zynqmp = dev_get_priv(dev);
  71. struct resource res;
  72. ofnode node;
  73. debug("%s(dev=%p)\n", __func__, dev);
  74. /* Get subnode where the regs are defined */
  75. /* Note IPI mailbox node needs to be the first one in DT */
  76. node = ofnode_first_subnode(dev_ofnode(dev));
  77. if (ofnode_read_resource_byname(node, "local_request_region", &res)) {
  78. dev_err(dev, "No reg property for local_request_region\n");
  79. return -EINVAL;
  80. };
  81. zynqmp->local_req_regs = devm_ioremap(dev, res.start,
  82. (res.start - res.end));
  83. if (ofnode_read_resource_byname(node, "local_response_region", &res)) {
  84. dev_err(dev, "No reg property for local_response_region\n");
  85. return -EINVAL;
  86. };
  87. zynqmp->local_res_regs = devm_ioremap(dev, res.start,
  88. (res.start - res.end));
  89. if (ofnode_read_resource_byname(node, "remote_request_region", &res)) {
  90. dev_err(dev, "No reg property for remote_request_region\n");
  91. return -EINVAL;
  92. };
  93. zynqmp->remote_req_regs = devm_ioremap(dev, res.start,
  94. (res.start - res.end));
  95. if (ofnode_read_resource_byname(node, "remote_response_region", &res)) {
  96. dev_err(dev, "No reg property for remote_response_region\n");
  97. return -EINVAL;
  98. };
  99. zynqmp->remote_res_regs = devm_ioremap(dev, res.start,
  100. (res.start - res.end));
  101. return 0;
  102. };
  103. static const struct udevice_id zynqmp_ipi_ids[] = {
  104. { .compatible = "xlnx,zynqmp-ipi-mailbox" },
  105. { }
  106. };
  107. struct mbox_ops zynqmp_ipi_mbox_ops = {
  108. .send = zynqmp_ipi_send,
  109. .recv = zynqmp_ipi_recv,
  110. };
  111. U_BOOT_DRIVER(zynqmp_ipi) = {
  112. .name = "zynqmp_ipi",
  113. .id = UCLASS_MAILBOX,
  114. .of_match = zynqmp_ipi_ids,
  115. .probe = zynqmp_ipi_probe,
  116. .priv_auto_alloc_size = sizeof(struct zynqmp_ipi),
  117. .ops = &zynqmp_ipi_mbox_ops,
  118. };