scoop.c 5.0 KB

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  1. /*
  2. * Support code for the SCOOP interface found on various Sharp PDAs
  3. *
  4. * Copyright (c) 2004 Richard Purdie
  5. *
  6. * Based on code written by Sharp/Lineo for 2.4 kernels
  7. *
  8. * This program is free software; you can redistribute it and/or modify
  9. * it under the terms of the GNU General Public License version 2 as
  10. * published by the Free Software Foundation.
  11. *
  12. */
  13. #include <linux/device.h>
  14. #include <linux/string.h>
  15. #include <linux/slab.h>
  16. #include <linux/platform_device.h>
  17. #include <asm/io.h>
  18. #include <asm/hardware/scoop.h>
  19. /* PCMCIA to Scoop linkage
  20. There is no easy way to link multiple scoop devices into one
  21. single entity for the pxa2xx_pcmcia device so this structure
  22. is used which is setup by the platform code.
  23. This file is never modular so this symbol is always
  24. accessile to the board support files.
  25. */
  26. struct scoop_pcmcia_config *platform_scoop_config;
  27. EXPORT_SYMBOL(platform_scoop_config);
  28. #define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr)))
  29. struct scoop_dev {
  30. void *base;
  31. spinlock_t scoop_lock;
  32. unsigned short suspend_clr;
  33. unsigned short suspend_set;
  34. u32 scoop_gpwr;
  35. };
  36. void reset_scoop(struct device *dev)
  37. {
  38. struct scoop_dev *sdev = dev_get_drvdata(dev);
  39. SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100; // 00
  40. SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000; // 04
  41. SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000; // 10
  42. SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000; // 18
  43. SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF; // 14
  44. SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000; // 1C
  45. SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
  46. }
  47. unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
  48. {
  49. unsigned short gpio_bit;
  50. unsigned long flag;
  51. struct scoop_dev *sdev = dev_get_drvdata(dev);
  52. spin_lock_irqsave(&sdev->scoop_lock, flag);
  53. gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
  54. SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
  55. spin_unlock_irqrestore(&sdev->scoop_lock, flag);
  56. return gpio_bit;
  57. }
  58. unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
  59. {
  60. unsigned short gpio_bit;
  61. unsigned long flag;
  62. struct scoop_dev *sdev = dev_get_drvdata(dev);
  63. spin_lock_irqsave(&sdev->scoop_lock, flag);
  64. gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
  65. SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
  66. spin_unlock_irqrestore(&sdev->scoop_lock, flag);
  67. return gpio_bit;
  68. }
  69. EXPORT_SYMBOL(set_scoop_gpio);
  70. EXPORT_SYMBOL(reset_scoop_gpio);
  71. unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
  72. {
  73. struct scoop_dev *sdev = dev_get_drvdata(dev);
  74. return SCOOP_REG(sdev->base,reg);
  75. }
  76. void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
  77. {
  78. struct scoop_dev *sdev = dev_get_drvdata(dev);
  79. SCOOP_REG(sdev->base,reg)=data;
  80. }
  81. EXPORT_SYMBOL(reset_scoop);
  82. EXPORT_SYMBOL(read_scoop_reg);
  83. EXPORT_SYMBOL(write_scoop_reg);
  84. static void check_scoop_reg(struct scoop_dev *sdev)
  85. {
  86. unsigned short mcr;
  87. mcr = SCOOP_REG(sdev->base, SCOOP_MCR);
  88. if ((mcr & 0x100) == 0)
  89. SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101;
  90. }
  91. #ifdef CONFIG_PM
  92. static int scoop_suspend(struct platform_device *dev, pm_message_t state)
  93. {
  94. struct scoop_dev *sdev = platform_get_drvdata(dev);
  95. check_scoop_reg(sdev);
  96. sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR);
  97. SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set;
  98. return 0;
  99. }
  100. static int scoop_resume(struct platform_device *dev)
  101. {
  102. struct scoop_dev *sdev = platform_get_drvdata(dev);
  103. check_scoop_reg(sdev);
  104. SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
  105. return 0;
  106. }
  107. #else
  108. #define scoop_suspend NULL
  109. #define scoop_resume NULL
  110. #endif
  111. int __init scoop_probe(struct platform_device *pdev)
  112. {
  113. struct scoop_dev *devptr;
  114. struct scoop_config *inf;
  115. struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  116. if (!mem)
  117. return -EINVAL;
  118. devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
  119. if (!devptr)
  120. return -ENOMEM;
  121. spin_lock_init(&devptr->scoop_lock);
  122. inf = pdev->dev.platform_data;
  123. devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
  124. if (!devptr->base) {
  125. kfree(devptr);
  126. return -ENOMEM;
  127. }
  128. platform_set_drvdata(pdev, devptr);
  129. printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
  130. SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
  131. reset_scoop(&pdev->dev);
  132. SCOOP_REG(devptr->base, SCOOP_CPR) = 0x0000;
  133. SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
  134. SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
  135. devptr->suspend_clr = inf->suspend_clr;
  136. devptr->suspend_set = inf->suspend_set;
  137. return 0;
  138. }
  139. static int scoop_remove(struct platform_device *pdev)
  140. {
  141. struct scoop_dev *sdev = platform_get_drvdata(pdev);
  142. if (sdev) {
  143. iounmap(sdev->base);
  144. kfree(sdev);
  145. platform_set_drvdata(pdev, NULL);
  146. }
  147. return 0;
  148. }
  149. static struct platform_driver scoop_driver = {
  150. .probe = scoop_probe,
  151. .remove = scoop_remove,
  152. .suspend = scoop_suspend,
  153. .resume = scoop_resume,
  154. .driver = {
  155. .name = "sharp-scoop",
  156. },
  157. };
  158. int __init scoop_init(void)
  159. {
  160. return platform_driver_register(&scoop_driver);
  161. }
  162. subsys_initcall(scoop_init);