maceps2.c 5.2 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206
  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * SGI O2 MACE PS2 controller driver for linux
  4. *
  5. * Copyright (C) 2002 Vivien Chappelier
  6. */
  7. #include <linux/module.h>
  8. #include <linux/init.h>
  9. #include <linux/serio.h>
  10. #include <linux/errno.h>
  11. #include <linux/interrupt.h>
  12. #include <linux/ioport.h>
  13. #include <linux/delay.h>
  14. #include <linux/platform_device.h>
  15. #include <linux/slab.h>
  16. #include <linux/spinlock.h>
  17. #include <linux/err.h>
  18. #include <asm/io.h>
  19. #include <asm/irq.h>
  20. #include <asm/ip32/mace.h>
  21. #include <asm/ip32/ip32_ints.h>
  22. MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org");
  23. MODULE_DESCRIPTION("SGI O2 MACE PS2 controller driver");
  24. MODULE_LICENSE("GPL");
  25. #define MACE_PS2_TIMEOUT 10000 /* in 50us unit */
  26. #define PS2_STATUS_CLOCK_SIGNAL BIT(0) /* external clock signal */
  27. #define PS2_STATUS_CLOCK_INHIBIT BIT(1) /* clken output signal */
  28. #define PS2_STATUS_TX_INPROGRESS BIT(2) /* transmission in progress */
  29. #define PS2_STATUS_TX_EMPTY BIT(3) /* empty transmit buffer */
  30. #define PS2_STATUS_RX_FULL BIT(4) /* full receive buffer */
  31. #define PS2_STATUS_RX_INPROGRESS BIT(5) /* reception in progress */
  32. #define PS2_STATUS_ERROR_PARITY BIT(6) /* parity error */
  33. #define PS2_STATUS_ERROR_FRAMING BIT(7) /* framing error */
  34. #define PS2_CONTROL_TX_CLOCK_DISABLE BIT(0) /* inhibit clock signal after TX */
  35. #define PS2_CONTROL_TX_ENABLE BIT(1) /* transmit enable */
  36. #define PS2_CONTROL_TX_INT_ENABLE BIT(2) /* enable transmit interrupt */
  37. #define PS2_CONTROL_RX_INT_ENABLE BIT(3) /* enable receive interrupt */
  38. #define PS2_CONTROL_RX_CLOCK_ENABLE BIT(4) /* pause reception if set to 0 */
  39. #define PS2_CONTROL_RESET BIT(5) /* reset */
  40. struct maceps2_data {
  41. struct mace_ps2port *port;
  42. int irq;
  43. };
  44. static struct maceps2_data port_data[2];
  45. static struct serio *maceps2_port[2];
  46. static struct platform_device *maceps2_device;
  47. static int maceps2_write(struct serio *dev, unsigned char val)
  48. {
  49. struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
  50. unsigned int timeout = MACE_PS2_TIMEOUT;
  51. do {
  52. if (port->status & PS2_STATUS_TX_EMPTY) {
  53. port->tx = val;
  54. return 0;
  55. }
  56. udelay(50);
  57. } while (timeout--);
  58. return -1;
  59. }
  60. static irqreturn_t maceps2_interrupt(int irq, void *dev_id)
  61. {
  62. struct serio *dev = dev_id;
  63. struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
  64. unsigned long byte;
  65. if (port->status & PS2_STATUS_RX_FULL) {
  66. byte = port->rx;
  67. serio_interrupt(dev, byte & 0xff, 0);
  68. }
  69. return IRQ_HANDLED;
  70. }
  71. static int maceps2_open(struct serio *dev)
  72. {
  73. struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
  74. if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) {
  75. printk(KERN_ERR "Could not allocate PS/2 IRQ\n");
  76. return -EBUSY;
  77. }
  78. /* Reset port */
  79. data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
  80. udelay(100);
  81. /* Enable interrupts */
  82. data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE |
  83. PS2_CONTROL_TX_ENABLE |
  84. PS2_CONTROL_RX_INT_ENABLE;
  85. return 0;
  86. }
  87. static void maceps2_close(struct serio *dev)
  88. {
  89. struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
  90. data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
  91. udelay(100);
  92. free_irq(data->irq, dev);
  93. }
  94. static struct serio *maceps2_allocate_port(int idx)
  95. {
  96. struct serio *serio;
  97. serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
  98. if (serio) {
  99. serio->id.type = SERIO_8042;
  100. serio->write = maceps2_write;
  101. serio->open = maceps2_open;
  102. serio->close = maceps2_close;
  103. snprintf(serio->name, sizeof(serio->name), "MACE PS/2 port%d", idx);
  104. snprintf(serio->phys, sizeof(serio->phys), "mace/serio%d", idx);
  105. serio->port_data = &port_data[idx];
  106. serio->dev.parent = &maceps2_device->dev;
  107. }
  108. return serio;
  109. }
  110. static int maceps2_probe(struct platform_device *dev)
  111. {
  112. maceps2_port[0] = maceps2_allocate_port(0);
  113. maceps2_port[1] = maceps2_allocate_port(1);
  114. if (!maceps2_port[0] || !maceps2_port[1]) {
  115. kfree(maceps2_port[0]);
  116. kfree(maceps2_port[1]);
  117. return -ENOMEM;
  118. }
  119. serio_register_port(maceps2_port[0]);
  120. serio_register_port(maceps2_port[1]);
  121. return 0;
  122. }
  123. static int maceps2_remove(struct platform_device *dev)
  124. {
  125. serio_unregister_port(maceps2_port[0]);
  126. serio_unregister_port(maceps2_port[1]);
  127. return 0;
  128. }
  129. static struct platform_driver maceps2_driver = {
  130. .driver = {
  131. .name = "maceps2",
  132. },
  133. .probe = maceps2_probe,
  134. .remove = maceps2_remove,
  135. };
  136. static int __init maceps2_init(void)
  137. {
  138. int error;
  139. error = platform_driver_register(&maceps2_driver);
  140. if (error)
  141. return error;
  142. maceps2_device = platform_device_alloc("maceps2", -1);
  143. if (!maceps2_device) {
  144. error = -ENOMEM;
  145. goto err_unregister_driver;
  146. }
  147. port_data[0].port = &mace->perif.ps2.keyb;
  148. port_data[0].irq = MACEISA_KEYB_IRQ;
  149. port_data[1].port = &mace->perif.ps2.mouse;
  150. port_data[1].irq = MACEISA_MOUSE_IRQ;
  151. error = platform_device_add(maceps2_device);
  152. if (error)
  153. goto err_free_device;
  154. return 0;
  155. err_free_device:
  156. platform_device_put(maceps2_device);
  157. err_unregister_driver:
  158. platform_driver_unregister(&maceps2_driver);
  159. return error;
  160. }
  161. static void __exit maceps2_exit(void)
  162. {
  163. platform_device_unregister(maceps2_device);
  164. platform_driver_unregister(&maceps2_driver);
  165. }
  166. module_init(maceps2_init);
  167. module_exit(maceps2_exit);