serial.c 5.2 KB

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  1. /*
  2. * (C) Copyright 2000 - 2003
  3. * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  4. *
  5. * SPDX-License-Identifier: GPL-2.0+
  6. *
  7. * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00, with
  8. * changes based on the file arch/powerpc/mbxboot/m8260_tty.c from the
  9. * Linux/PPC sources (m8260_tty.c had no copyright info in it).
  10. *
  11. * Martin Krause, 8 Jun 2006
  12. * Added SERIAL_MULTI support
  13. */
  14. /*
  15. * Minimal serial functions needed to use one of the PSC ports
  16. * as serial console interface.
  17. */
  18. #include <common.h>
  19. #include <linux/compiler.h>
  20. #include <mpc5xxx.h>
  21. #include <serial.h>
  22. DECLARE_GLOBAL_DATA_PTR;
  23. #if defined(CONFIG_PSC_CONSOLE)
  24. #if CONFIG_PSC_CONSOLE == 1
  25. #define PSC_BASE MPC5XXX_PSC1
  26. #elif CONFIG_PSC_CONSOLE == 2
  27. #define PSC_BASE MPC5XXX_PSC2
  28. #elif CONFIG_PSC_CONSOLE == 3
  29. #define PSC_BASE MPC5XXX_PSC3
  30. #elif CONFIG_PSC_CONSOLE == 4
  31. #define PSC_BASE MPC5XXX_PSC4
  32. #elif CONFIG_PSC_CONSOLE == 5
  33. #define PSC_BASE MPC5XXX_PSC5
  34. #elif CONFIG_PSC_CONSOLE == 6
  35. #define PSC_BASE MPC5XXX_PSC6
  36. #else
  37. #error CONFIG_PSC_CONSOLE must be in 1 ... 6
  38. #endif
  39. #if defined(CONFIG_PSC_CONSOLE2)
  40. #if CONFIG_PSC_CONSOLE2 == 1
  41. #define PSC_BASE2 MPC5XXX_PSC1
  42. #elif CONFIG_PSC_CONSOLE2 == 2
  43. #define PSC_BASE2 MPC5XXX_PSC2
  44. #elif CONFIG_PSC_CONSOLE2 == 3
  45. #define PSC_BASE2 MPC5XXX_PSC3
  46. #elif CONFIG_PSC_CONSOLE2 == 4
  47. #define PSC_BASE2 MPC5XXX_PSC4
  48. #elif CONFIG_PSC_CONSOLE2 == 5
  49. #define PSC_BASE2 MPC5XXX_PSC5
  50. #elif CONFIG_PSC_CONSOLE2 == 6
  51. #define PSC_BASE2 MPC5XXX_PSC6
  52. #else
  53. #error CONFIG_PSC_CONSOLE2 must be in 1 ... 6
  54. #endif
  55. #endif
  56. int serial_init_dev (unsigned long dev_base)
  57. {
  58. volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
  59. unsigned long baseclk;
  60. int div;
  61. /* reset PSC */
  62. psc->command = PSC_SEL_MODE_REG_1;
  63. /* select clock sources */
  64. psc->psc_clock_select = 0;
  65. baseclk = (gd->arch.ipb_clk + 16) / 32;
  66. /* switch to UART mode */
  67. psc->sicr = 0;
  68. /* configure parity, bit length and so on */
  69. psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
  70. psc->mode = PSC_MODE_ONE_STOP;
  71. /* set up UART divisor */
  72. div = (baseclk + (gd->baudrate/2)) / gd->baudrate;
  73. psc->ctur = (div >> 8) & 0xff;
  74. psc->ctlr = div & 0xff;
  75. /* disable all interrupts */
  76. psc->psc_imr = 0;
  77. /* reset and enable Rx/Tx */
  78. psc->command = PSC_RST_RX;
  79. psc->command = PSC_RST_TX;
  80. psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;
  81. return (0);
  82. }
  83. void serial_putc_dev (unsigned long dev_base, const char c)
  84. {
  85. volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
  86. if (c == '\n')
  87. serial_putc_dev (dev_base, '\r');
  88. /* Wait for last character to go. */
  89. while (!(psc->psc_status & PSC_SR_TXEMP))
  90. ;
  91. psc->psc_buffer_8 = c;
  92. }
  93. void serial_puts_dev (unsigned long dev_base, const char *s)
  94. {
  95. while (*s) {
  96. serial_putc_dev (dev_base, *s++);
  97. }
  98. }
  99. int serial_getc_dev (unsigned long dev_base)
  100. {
  101. volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
  102. /* Wait for a character to arrive. */
  103. while (!(psc->psc_status & PSC_SR_RXRDY))
  104. ;
  105. return psc->psc_buffer_8;
  106. }
  107. int serial_tstc_dev (unsigned long dev_base)
  108. {
  109. volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
  110. return (psc->psc_status & PSC_SR_RXRDY);
  111. }
  112. void serial_setbrg_dev (unsigned long dev_base)
  113. {
  114. volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
  115. unsigned long baseclk, div;
  116. baseclk = (gd->arch.ipb_clk + 16) / 32;
  117. /* set up UART divisor */
  118. div = (baseclk + (gd->baudrate/2)) / gd->baudrate;
  119. psc->ctur = (div >> 8) & 0xFF;
  120. psc->ctlr = div & 0xff;
  121. }
  122. void serial_setrts_dev (unsigned long dev_base, int s)
  123. {
  124. volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
  125. if (s) {
  126. /* Assert RTS (become LOW) */
  127. psc->op1 = 0x1;
  128. }
  129. else {
  130. /* Negate RTS (become HIGH) */
  131. psc->op0 = 0x1;
  132. }
  133. }
  134. int serial_getcts_dev (unsigned long dev_base)
  135. {
  136. volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
  137. return (psc->ip & 0x1) ? 0 : 1;
  138. }
  139. int serial0_init(void)
  140. {
  141. return (serial_init_dev(PSC_BASE));
  142. }
  143. void serial0_setbrg (void)
  144. {
  145. serial_setbrg_dev(PSC_BASE);
  146. }
  147. void serial0_putc(const char c)
  148. {
  149. serial_putc_dev(PSC_BASE,c);
  150. }
  151. void serial0_puts(const char *s)
  152. {
  153. serial_puts_dev(PSC_BASE, s);
  154. }
  155. int serial0_getc(void)
  156. {
  157. return(serial_getc_dev(PSC_BASE));
  158. }
  159. int serial0_tstc(void)
  160. {
  161. return (serial_tstc_dev(PSC_BASE));
  162. }
  163. struct serial_device serial0_device =
  164. {
  165. .name = "serial0",
  166. .start = serial0_init,
  167. .stop = NULL,
  168. .setbrg = serial0_setbrg,
  169. .getc = serial0_getc,
  170. .tstc = serial0_tstc,
  171. .putc = serial0_putc,
  172. .puts = serial0_puts,
  173. };
  174. __weak struct serial_device *default_serial_console(void)
  175. {
  176. return &serial0_device;
  177. }
  178. #ifdef CONFIG_PSC_CONSOLE2
  179. int serial1_init(void)
  180. {
  181. return serial_init_dev(PSC_BASE2);
  182. }
  183. void serial1_setbrg(void)
  184. {
  185. serial_setbrg_dev(PSC_BASE2);
  186. }
  187. void serial1_putc(const char c)
  188. {
  189. serial_putc_dev(PSC_BASE2, c);
  190. }
  191. void serial1_puts(const char *s)
  192. {
  193. serial_puts_dev(PSC_BASE2, s);
  194. }
  195. int serial1_getc(void)
  196. {
  197. return serial_getc_dev(PSC_BASE2);
  198. }
  199. int serial1_tstc(void)
  200. {
  201. return serial_tstc_dev(PSC_BASE2);
  202. }
  203. struct serial_device serial1_device =
  204. {
  205. .name = "serial1",
  206. .start = serial1_init,
  207. .stop = NULL,
  208. .setbrg = serial1_setbrg,
  209. .getc = serial1_getc,
  210. .tstc = serial1_tstc,
  211. .putc = serial1_putc,
  212. .puts = serial1_puts,
  213. };
  214. #endif /* CONFIG_PSC_CONSOLE2 */
  215. #endif /* CONFIG_PSC_CONSOLE */