spi-rpc-if.c 5.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. //
  3. // RPC-IF SPI/QSPI/Octa driver
  4. //
  5. // Copyright (C) 2018 ~ 2019 Renesas Solutions Corp.
  6. // Copyright (C) 2019 Macronix International Co., Ltd.
  7. // Copyright (C) 2019 - 2020 Cogent Embedded, Inc.
  8. //
  9. #include <linux/module.h>
  10. #include <linux/platform_device.h>
  11. #include <linux/spi/spi.h>
  12. #include <linux/spi/spi-mem.h>
  13. #include <memory/renesas-rpc-if.h>
  14. #include <asm/unaligned.h>
  15. static void rpcif_spi_mem_prepare(struct spi_device *spi_dev,
  16. const struct spi_mem_op *spi_op,
  17. u64 *offs, size_t *len)
  18. {
  19. struct rpcif *rpc = spi_controller_get_devdata(spi_dev->controller);
  20. struct rpcif_op rpc_op = { };
  21. rpc_op.cmd.opcode = spi_op->cmd.opcode;
  22. rpc_op.cmd.buswidth = spi_op->cmd.buswidth;
  23. if (spi_op->addr.nbytes) {
  24. rpc_op.addr.buswidth = spi_op->addr.buswidth;
  25. rpc_op.addr.nbytes = spi_op->addr.nbytes;
  26. rpc_op.addr.val = spi_op->addr.val;
  27. }
  28. if (spi_op->dummy.nbytes) {
  29. rpc_op.dummy.buswidth = spi_op->dummy.buswidth;
  30. rpc_op.dummy.ncycles = spi_op->dummy.nbytes * 8 /
  31. spi_op->dummy.buswidth;
  32. }
  33. if (spi_op->data.nbytes || (offs && len)) {
  34. rpc_op.data.buswidth = spi_op->data.buswidth;
  35. rpc_op.data.nbytes = spi_op->data.nbytes;
  36. switch (spi_op->data.dir) {
  37. case SPI_MEM_DATA_IN:
  38. rpc_op.data.dir = RPCIF_DATA_IN;
  39. rpc_op.data.buf.in = spi_op->data.buf.in;
  40. break;
  41. case SPI_MEM_DATA_OUT:
  42. rpc_op.data.dir = RPCIF_DATA_OUT;
  43. rpc_op.data.buf.out = spi_op->data.buf.out;
  44. break;
  45. case SPI_MEM_NO_DATA:
  46. rpc_op.data.dir = RPCIF_NO_DATA;
  47. break;
  48. }
  49. } else {
  50. rpc_op.data.dir = RPCIF_NO_DATA;
  51. }
  52. rpcif_prepare(rpc, &rpc_op, offs, len);
  53. }
  54. static bool rpcif_spi_mem_supports_op(struct spi_mem *mem,
  55. const struct spi_mem_op *op)
  56. {
  57. if (!spi_mem_default_supports_op(mem, op))
  58. return false;
  59. if (op->data.buswidth > 4 || op->addr.buswidth > 4 ||
  60. op->dummy.buswidth > 4 || op->cmd.buswidth > 4 ||
  61. op->addr.nbytes > 4)
  62. return false;
  63. return true;
  64. }
  65. static ssize_t rpcif_spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc,
  66. u64 offs, size_t len, void *buf)
  67. {
  68. struct rpcif *rpc =
  69. spi_controller_get_devdata(desc->mem->spi->controller);
  70. if (offs + desc->info.offset + len > U32_MAX)
  71. return -EINVAL;
  72. rpcif_spi_mem_prepare(desc->mem->spi, &desc->info.op_tmpl, &offs, &len);
  73. return rpcif_dirmap_read(rpc, offs, len, buf);
  74. }
  75. static int rpcif_spi_mem_dirmap_create(struct spi_mem_dirmap_desc *desc)
  76. {
  77. struct rpcif *rpc =
  78. spi_controller_get_devdata(desc->mem->spi->controller);
  79. if (desc->info.offset + desc->info.length > U32_MAX)
  80. return -ENOTSUPP;
  81. if (!rpcif_spi_mem_supports_op(desc->mem, &desc->info.op_tmpl))
  82. return -ENOTSUPP;
  83. if (!rpc->dirmap && desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN)
  84. return -ENOTSUPP;
  85. if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT)
  86. return -ENOTSUPP;
  87. return 0;
  88. }
  89. static int rpcif_spi_mem_exec_op(struct spi_mem *mem,
  90. const struct spi_mem_op *op)
  91. {
  92. struct rpcif *rpc =
  93. spi_controller_get_devdata(mem->spi->controller);
  94. rpcif_spi_mem_prepare(mem->spi, op, NULL, NULL);
  95. return rpcif_manual_xfer(rpc);
  96. }
  97. static const struct spi_controller_mem_ops rpcif_spi_mem_ops = {
  98. .supports_op = rpcif_spi_mem_supports_op,
  99. .exec_op = rpcif_spi_mem_exec_op,
  100. .dirmap_create = rpcif_spi_mem_dirmap_create,
  101. .dirmap_read = rpcif_spi_mem_dirmap_read,
  102. };
  103. static int rpcif_spi_probe(struct platform_device *pdev)
  104. {
  105. struct device *parent = pdev->dev.parent;
  106. struct spi_controller *ctlr;
  107. struct rpcif *rpc;
  108. int error;
  109. ctlr = devm_spi_alloc_master(&pdev->dev, sizeof(*rpc));
  110. if (!ctlr)
  111. return -ENOMEM;
  112. rpc = spi_controller_get_devdata(ctlr);
  113. error = rpcif_sw_init(rpc, parent);
  114. if (error)
  115. return error;
  116. platform_set_drvdata(pdev, ctlr);
  117. ctlr->dev.of_node = parent->of_node;
  118. rpcif_enable_rpm(rpc);
  119. ctlr->num_chipselect = 1;
  120. ctlr->mem_ops = &rpcif_spi_mem_ops;
  121. ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
  122. ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_QUAD | SPI_RX_QUAD;
  123. ctlr->flags = SPI_CONTROLLER_HALF_DUPLEX;
  124. rpcif_hw_init(rpc, false);
  125. error = spi_register_controller(ctlr);
  126. if (error) {
  127. dev_err(&pdev->dev, "spi_register_controller failed\n");
  128. rpcif_disable_rpm(rpc);
  129. }
  130. return error;
  131. }
  132. static int rpcif_spi_remove(struct platform_device *pdev)
  133. {
  134. struct spi_controller *ctlr = platform_get_drvdata(pdev);
  135. struct rpcif *rpc = spi_controller_get_devdata(ctlr);
  136. spi_unregister_controller(ctlr);
  137. rpcif_disable_rpm(rpc);
  138. return 0;
  139. }
  140. #ifdef CONFIG_PM_SLEEP
  141. static int rpcif_spi_suspend(struct device *dev)
  142. {
  143. struct spi_controller *ctlr = dev_get_drvdata(dev);
  144. return spi_controller_suspend(ctlr);
  145. }
  146. static int rpcif_spi_resume(struct device *dev)
  147. {
  148. struct spi_controller *ctlr = dev_get_drvdata(dev);
  149. return spi_controller_resume(ctlr);
  150. }
  151. static SIMPLE_DEV_PM_OPS(rpcif_spi_pm_ops, rpcif_spi_suspend, rpcif_spi_resume);
  152. #define DEV_PM_OPS (&rpcif_spi_pm_ops)
  153. #else
  154. #define DEV_PM_OPS NULL
  155. #endif
  156. static struct platform_driver rpcif_spi_driver = {
  157. .probe = rpcif_spi_probe,
  158. .remove = rpcif_spi_remove,
  159. .driver = {
  160. .name = "rpc-if-spi",
  161. .pm = DEV_PM_OPS,
  162. },
  163. };
  164. module_platform_driver(rpcif_spi_driver);
  165. MODULE_DESCRIPTION("Renesas RPC-IF SPI driver");
  166. MODULE_LICENSE("GPL v2");