tc6387xb.c 5.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Toshiba TC6387XB support
  4. * Copyright (c) 2005 Ian Molton
  5. *
  6. * This file contains TC6387XB base support.
  7. */
  8. #include <linux/module.h>
  9. #include <linux/platform_device.h>
  10. #include <linux/clk.h>
  11. #include <linux/err.h>
  12. #include <linux/mfd/core.h>
  13. #include <linux/mfd/tmio.h>
  14. #include <linux/mfd/tc6387xb.h>
  15. #include <linux/slab.h>
  16. enum {
  17. TC6387XB_CELL_MMC,
  18. };
  19. struct tc6387xb {
  20. void __iomem *scr;
  21. struct clk *clk32k;
  22. struct resource rscr;
  23. };
  24. static struct resource tc6387xb_mmc_resources[] = {
  25. {
  26. .start = 0x800,
  27. .end = 0x9ff,
  28. .flags = IORESOURCE_MEM,
  29. },
  30. {
  31. .start = 0,
  32. .end = 0,
  33. .flags = IORESOURCE_IRQ,
  34. },
  35. };
  36. /*--------------------------------------------------------------------------*/
  37. #ifdef CONFIG_PM
  38. static int tc6387xb_suspend(struct platform_device *dev, pm_message_t state)
  39. {
  40. struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  41. struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
  42. if (pdata && pdata->suspend)
  43. pdata->suspend(dev);
  44. clk_disable_unprepare(tc6387xb->clk32k);
  45. return 0;
  46. }
  47. static int tc6387xb_resume(struct platform_device *dev)
  48. {
  49. struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  50. struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
  51. clk_prepare_enable(tc6387xb->clk32k);
  52. if (pdata && pdata->resume)
  53. pdata->resume(dev);
  54. tmio_core_mmc_resume(tc6387xb->scr + 0x200, 0,
  55. tc6387xb_mmc_resources[0].start & 0xfffe);
  56. return 0;
  57. }
  58. #else
  59. #define tc6387xb_suspend NULL
  60. #define tc6387xb_resume NULL
  61. #endif
  62. /*--------------------------------------------------------------------------*/
  63. static void tc6387xb_mmc_pwr(struct platform_device *mmc, int state)
  64. {
  65. struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
  66. tmio_core_mmc_pwr(tc6387xb->scr + 0x200, 0, state);
  67. }
  68. static void tc6387xb_mmc_clk_div(struct platform_device *mmc, int state)
  69. {
  70. struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
  71. tmio_core_mmc_clk_div(tc6387xb->scr + 0x200, 0, state);
  72. }
  73. static int tc6387xb_mmc_enable(struct platform_device *mmc)
  74. {
  75. struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
  76. clk_prepare_enable(tc6387xb->clk32k);
  77. tmio_core_mmc_enable(tc6387xb->scr + 0x200, 0,
  78. tc6387xb_mmc_resources[0].start & 0xfffe);
  79. return 0;
  80. }
  81. static int tc6387xb_mmc_disable(struct platform_device *mmc)
  82. {
  83. struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
  84. clk_disable_unprepare(tc6387xb->clk32k);
  85. return 0;
  86. }
  87. static struct tmio_mmc_data tc6387xb_mmc_data = {
  88. .hclk = 24000000,
  89. .set_pwr = tc6387xb_mmc_pwr,
  90. .set_clk_div = tc6387xb_mmc_clk_div,
  91. };
  92. /*--------------------------------------------------------------------------*/
  93. static const struct mfd_cell tc6387xb_cells[] = {
  94. [TC6387XB_CELL_MMC] = {
  95. .name = "tmio-mmc",
  96. .enable = tc6387xb_mmc_enable,
  97. .disable = tc6387xb_mmc_disable,
  98. .platform_data = &tc6387xb_mmc_data,
  99. .pdata_size = sizeof(tc6387xb_mmc_data),
  100. .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources),
  101. .resources = tc6387xb_mmc_resources,
  102. },
  103. };
  104. static int tc6387xb_probe(struct platform_device *dev)
  105. {
  106. struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
  107. struct resource *iomem, *rscr;
  108. struct clk *clk32k;
  109. struct tc6387xb *tc6387xb;
  110. int irq, ret;
  111. iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
  112. if (!iomem)
  113. return -EINVAL;
  114. tc6387xb = kzalloc(sizeof(*tc6387xb), GFP_KERNEL);
  115. if (!tc6387xb)
  116. return -ENOMEM;
  117. ret = platform_get_irq(dev, 0);
  118. if (ret >= 0)
  119. irq = ret;
  120. else
  121. goto err_no_irq;
  122. clk32k = clk_get(&dev->dev, "CLK_CK32K");
  123. if (IS_ERR(clk32k)) {
  124. ret = PTR_ERR(clk32k);
  125. goto err_no_clk;
  126. }
  127. rscr = &tc6387xb->rscr;
  128. rscr->name = "tc6387xb-core";
  129. rscr->start = iomem->start;
  130. rscr->end = iomem->start + 0xff;
  131. rscr->flags = IORESOURCE_MEM;
  132. ret = request_resource(iomem, rscr);
  133. if (ret)
  134. goto err_resource;
  135. tc6387xb->scr = ioremap(rscr->start, resource_size(rscr));
  136. if (!tc6387xb->scr) {
  137. ret = -ENOMEM;
  138. goto err_ioremap;
  139. }
  140. tc6387xb->clk32k = clk32k;
  141. platform_set_drvdata(dev, tc6387xb);
  142. if (pdata && pdata->enable)
  143. pdata->enable(dev);
  144. dev_info(&dev->dev, "Toshiba tc6387xb initialised\n");
  145. ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
  146. ARRAY_SIZE(tc6387xb_cells), iomem, irq, NULL);
  147. if (!ret)
  148. return 0;
  149. iounmap(tc6387xb->scr);
  150. err_ioremap:
  151. release_resource(&tc6387xb->rscr);
  152. err_resource:
  153. clk_put(clk32k);
  154. err_no_clk:
  155. err_no_irq:
  156. kfree(tc6387xb);
  157. return ret;
  158. }
  159. static int tc6387xb_remove(struct platform_device *dev)
  160. {
  161. struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
  162. mfd_remove_devices(&dev->dev);
  163. iounmap(tc6387xb->scr);
  164. release_resource(&tc6387xb->rscr);
  165. clk_disable_unprepare(tc6387xb->clk32k);
  166. clk_put(tc6387xb->clk32k);
  167. kfree(tc6387xb);
  168. return 0;
  169. }
  170. static struct platform_driver tc6387xb_platform_driver = {
  171. .driver = {
  172. .name = "tc6387xb",
  173. },
  174. .probe = tc6387xb_probe,
  175. .remove = tc6387xb_remove,
  176. .suspend = tc6387xb_suspend,
  177. .resume = tc6387xb_resume,
  178. };
  179. module_platform_driver(tc6387xb_platform_driver);
  180. MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
  181. MODULE_LICENSE("GPL v2");
  182. MODULE_AUTHOR("Ian Molton");
  183. MODULE_ALIAS("platform:tc6387xb");