serial_xuartlite.c 3.3 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2008 - 2015 Michal Simek <monstr@monstr.eu>
  4. * Clean driver and add xilinx constant from header file
  5. *
  6. * (C) Copyright 2004 Atmark Techno, Inc.
  7. * Yasushi SHOJI <yashi@atmark-techno.com>
  8. */
  9. #include <config.h>
  10. #include <common.h>
  11. #include <dm.h>
  12. #include <asm/io.h>
  13. #include <linux/compiler.h>
  14. #include <serial.h>
  15. #define SR_TX_FIFO_FULL BIT(3) /* transmit FIFO full */
  16. #define SR_TX_FIFO_EMPTY BIT(2) /* transmit FIFO empty */
  17. #define SR_RX_FIFO_VALID_DATA BIT(0) /* data in receive FIFO */
  18. #define SR_RX_FIFO_FULL BIT(1) /* receive FIFO full */
  19. #define ULITE_CONTROL_RST_TX 0x01
  20. #define ULITE_CONTROL_RST_RX 0x02
  21. struct uartlite {
  22. unsigned int rx_fifo;
  23. unsigned int tx_fifo;
  24. unsigned int status;
  25. unsigned int control;
  26. };
  27. struct uartlite_platdata {
  28. struct uartlite *regs;
  29. };
  30. static int uartlite_serial_putc(struct udevice *dev, const char ch)
  31. {
  32. struct uartlite_platdata *plat = dev_get_platdata(dev);
  33. struct uartlite *regs = plat->regs;
  34. if (in_be32(&regs->status) & SR_TX_FIFO_FULL)
  35. return -EAGAIN;
  36. out_be32(&regs->tx_fifo, ch & 0xff);
  37. return 0;
  38. }
  39. static int uartlite_serial_getc(struct udevice *dev)
  40. {
  41. struct uartlite_platdata *plat = dev_get_platdata(dev);
  42. struct uartlite *regs = plat->regs;
  43. if (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
  44. return -EAGAIN;
  45. return in_be32(&regs->rx_fifo) & 0xff;
  46. }
  47. static int uartlite_serial_pending(struct udevice *dev, bool input)
  48. {
  49. struct uartlite_platdata *plat = dev_get_platdata(dev);
  50. struct uartlite *regs = plat->regs;
  51. if (input)
  52. return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
  53. return !(in_be32(&regs->status) & SR_TX_FIFO_EMPTY);
  54. }
  55. static int uartlite_serial_probe(struct udevice *dev)
  56. {
  57. struct uartlite_platdata *plat = dev_get_platdata(dev);
  58. struct uartlite *regs = plat->regs;
  59. out_be32(&regs->control, 0);
  60. out_be32(&regs->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
  61. in_be32(&regs->control);
  62. return 0;
  63. }
  64. static int uartlite_serial_ofdata_to_platdata(struct udevice *dev)
  65. {
  66. struct uartlite_platdata *plat = dev_get_platdata(dev);
  67. plat->regs = (struct uartlite *)devfdt_get_addr(dev);
  68. return 0;
  69. }
  70. static const struct dm_serial_ops uartlite_serial_ops = {
  71. .putc = uartlite_serial_putc,
  72. .pending = uartlite_serial_pending,
  73. .getc = uartlite_serial_getc,
  74. };
  75. static const struct udevice_id uartlite_serial_ids[] = {
  76. { .compatible = "xlnx,opb-uartlite-1.00.b", },
  77. { .compatible = "xlnx,xps-uartlite-1.00.a" },
  78. { }
  79. };
  80. U_BOOT_DRIVER(serial_uartlite) = {
  81. .name = "serial_uartlite",
  82. .id = UCLASS_SERIAL,
  83. .of_match = uartlite_serial_ids,
  84. .ofdata_to_platdata = uartlite_serial_ofdata_to_platdata,
  85. .platdata_auto_alloc_size = sizeof(struct uartlite_platdata),
  86. .probe = uartlite_serial_probe,
  87. .ops = &uartlite_serial_ops,
  88. };
  89. #ifdef CONFIG_DEBUG_UART_UARTLITE
  90. #include <debug_uart.h>
  91. static inline void _debug_uart_init(void)
  92. {
  93. struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
  94. out_be32(&regs->control, 0);
  95. out_be32(&regs->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
  96. in_be32(&regs->control);
  97. }
  98. static inline void _debug_uart_putc(int ch)
  99. {
  100. struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
  101. while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
  102. ;
  103. out_be32(&regs->tx_fifo, ch & 0xff);
  104. }
  105. DEBUG_UART_FUNCS
  106. #endif