arch/arm/mach-omap2/mcbsp.c

   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
  23 #include <plat/dma.h>
  24 #include <plat/omap_device.h>
  25 #include <linux/pm_runtime.h>
  26
  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 "cm2xxx_3xxx.h"
  32 #include "cm-regbits-34xx.h"
  33
  34 static int omap3_enable_st_clock(unsigned int id, bool enable)
  35 {
  36         unsigned int w;
  37
  38         /*
  39          * Sidetone uses McBSP ICLK - which must not idle when sidetones
  40          * are enabled or sidetones start sounding ugly.
  41          */
  42         w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
  43         if (enable)
  44                 w &= ~(1 << (id - 2));
  45         else
  46                 w |= 1 << (id - 2);
  47         omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
  48
  49         return 0;
  50 }
  51
  52 static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
  53 {
  54         int id, count = 1;
  55         char *name = "omap-mcbsp";
  56         struct omap_hwmod *oh_device[2];
  57         struct omap_mcbsp_platform_data *pdata = NULL;
  58         struct platform_device *pdev;
  59
  60         sscanf(oh->name, "mcbsp%d", &id);
  61
  62         pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
  63         if (!pdata) {
  64                 pr_err("%s: No memory for mcbsp\n", __func__);
  65                 return -ENOMEM;
  66         }
  67
  68         pdata->reg_step = 4;
  69         if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
  70                 pdata->reg_size = 2;
  71         } else {
  72                 pdata->reg_size = 4;
  73                 pdata->has_ccr = true;
  74         }
  75
  76         if (oh->class->rev == MCBSP_CONFIG_TYPE2) {
  77                 /* The FIFO has 128 locations */
  78                 pdata->buffer_size = 0x80;
  79         } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
  80                 if (id == 2)
  81                         /* The FIFO has 1024 + 256 locations */
  82                         pdata->buffer_size = 0x500;
  83                 else
  84                         /* The FIFO has 128 locations */
  85                         pdata->buffer_size = 0x80;
  86         } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
  87                 /* The FIFO has 128 locations for all instances */
  88                 pdata->buffer_size = 0x80;
  89         }
  90
  91         if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
  92                 pdata->has_wakeup = true;
  93
  94         oh_device[0] = oh;
  95
  96         if (oh->dev_attr) {
  97                 oh_device[1] = omap_hwmod_lookup((
  98                 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
  99                 pdata->enable_st_clock = omap3_enable_st_clock;
 100                 count++;
 101         }
 102         pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
 103                                 sizeof(*pdata), NULL, 0, false);
 104         kfree(pdata);
 105         if (IS_ERR(pdev))  {
 106                 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
 107                                         name, oh->name);
 108                 return PTR_ERR(pdev);
 109         }
 110         return 0;
 111 }
 112
 113 static int __init omap2_mcbsp_init(void)
 114 {
 115         if (!of_have_populated_dt())
 116                 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
 117
 118         return 0;
 119 }
 120 arch_initcall(omap2_mcbsp_init);