mcbsp.c 3.1 KB

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  1. /*
  2. * linux/arch/arm/mach-omap2/mcbsp.c
  3. *
  4. * Copyright (C) 2008 Instituto Nokia de Tecnologia
  5. * Contact: Eduardo Valentin <eduardo.valentin@indt.org.br>
  6. *
  7. * This program is free software; you can redistribute it and/or modify
  8. * it under the terms of the GNU General Public License version 2 as
  9. * published by the Free Software Foundation.
  10. *
  11. * Multichannel mode not supported.
  12. */
  13. #include <linux/module.h>
  14. #include <linux/init.h>
  15. #include <linux/clk.h>
  16. #include <linux/err.h>
  17. #include <linux/io.h>
  18. #include <linux/of.h>
  19. #include <linux/platform_device.h>
  20. #include <linux/slab.h>
  21. #include <linux/platform_data/asoc-ti-mcbsp.h>
  22. #include <linux/pm_runtime.h>
  23. #include <linux/omap-dma.h>
  24. #include "soc.h"
  25. #include "omap_device.h"
  26. #include "clock.h"
  27. /*
  28. * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
  29. * Sidetone needs non-gated ICLK and sidetone autoidle is broken.
  30. */
  31. #include "cm3xxx.h"
  32. #include "cm-regbits-34xx.h"
  33. static struct clk *mcbsp_iclks[5];
  34. static int omap3_enable_st_clock(unsigned int id, bool enable)
  35. {
  36. /*
  37. * Sidetone uses McBSP ICLK - which must not idle when sidetones
  38. * are enabled or sidetones start sounding ugly.
  39. */
  40. if (enable)
  41. return omap2_clk_deny_idle(mcbsp_iclks[id]);
  42. else
  43. return omap2_clk_allow_idle(mcbsp_iclks[id]);
  44. }
  45. static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
  46. {
  47. int id, count = 1;
  48. char *name = "omap-mcbsp";
  49. struct omap_hwmod *oh_device[2];
  50. struct omap_mcbsp_platform_data *pdata = NULL;
  51. struct platform_device *pdev;
  52. char clk_name[11];
  53. sscanf(oh->name, "mcbsp%d", &id);
  54. pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
  55. if (!pdata) {
  56. pr_err("%s: No memory for mcbsp\n", __func__);
  57. return -ENOMEM;
  58. }
  59. pdata->reg_step = 4;
  60. if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
  61. pdata->reg_size = 2;
  62. } else {
  63. pdata->reg_size = 4;
  64. pdata->has_ccr = true;
  65. }
  66. if (oh->class->rev == MCBSP_CONFIG_TYPE2) {
  67. /* The FIFO has 128 locations */
  68. pdata->buffer_size = 0x80;
  69. } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
  70. if (id == 2)
  71. /* The FIFO has 1024 + 256 locations */
  72. pdata->buffer_size = 0x500;
  73. else
  74. /* The FIFO has 128 locations */
  75. pdata->buffer_size = 0x80;
  76. } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
  77. /* The FIFO has 128 locations for all instances */
  78. pdata->buffer_size = 0x80;
  79. }
  80. if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
  81. pdata->has_wakeup = true;
  82. oh_device[0] = oh;
  83. if (oh->dev_attr) {
  84. oh_device[1] = omap_hwmod_lookup((
  85. (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
  86. pdata->enable_st_clock = omap3_enable_st_clock;
  87. sprintf(clk_name, "mcbsp%d_ick", id);
  88. mcbsp_iclks[id] = clk_get(NULL, clk_name);
  89. count++;
  90. }
  91. pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
  92. sizeof(*pdata));
  93. kfree(pdata);
  94. if (IS_ERR(pdev)) {
  95. pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
  96. name, oh->name);
  97. return PTR_ERR(pdev);
  98. }
  99. return 0;
  100. }
  101. static int __init omap2_mcbsp_init(void)
  102. {
  103. if (!of_have_populated_dt())
  104. omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
  105. return 0;
  106. }
  107. omap_arch_initcall(omap2_mcbsp_init);