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 #include <linux/pm_runtime.h>
  23
  24 #include <linux/omap-dma.h>
  25
  26 #include "soc.h"
  27 #include "omap_device.h"
  28
  29 /*
  30  * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
  31  * Sidetone needs non-gated ICLK and sidetone autoidle is broken.
  32  */
  33 #include "cm3xxx.h"
  34 #include "cm-regbits-34xx.h"
  35
  36 static int omap3_enable_st_clock(unsigned int id, bool enable)
  37 {
  38         unsigned int w;
  39
  40         /*
  41          * Sidetone uses McBSP ICLK - which must not idle when sidetones
  42          * are enabled or sidetones start sounding ugly.
  43          */
  44         w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
  45         if (enable)
  46                 w &= ~(1 << (id - 2));
  47         else
  48                 w |= 1 << (id - 2);
  49         omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
  50
  51         return 0;
  52 }
  53
  54 static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
  55 {
  56         int id, count = 1;
  57         char *name = "omap-mcbsp";
  58         struct omap_hwmod *oh_device[2];
  59         struct omap_mcbsp_platform_data *pdata = NULL;
  60         struct platform_device *pdev;
  61
  62         sscanf(oh->name, "mcbsp%d", &id);
  63
  64         pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
  65         if (!pdata) {
  66                 pr_err("%s: No memory for mcbsp\n", __func__);
  67                 return -ENOMEM;
  68         }
  69
  70         pdata->reg_step = 4;
  71         if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
  72                 pdata->reg_size = 2;
  73         } else {
  74                 pdata->reg_size = 4;
  75                 pdata->has_ccr = true;
  76         }
  77
  78         if (oh->class->rev == MCBSP_CONFIG_TYPE2) {
  79                 /* The FIFO has 128 locations */
  80                 pdata->buffer_size = 0x80;
  81         } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
  82                 if (id == 2)
  83                         /* The FIFO has 1024 + 256 locations */
  84                         pdata->buffer_size = 0x500;
  85                 else
  86                         /* The FIFO has 128 locations */
  87                         pdata->buffer_size = 0x80;
  88         } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
  89                 /* The FIFO has 128 locations for all instances */
  90                 pdata->buffer_size = 0x80;
  91         }
  92
  93         if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
  94                 pdata->has_wakeup = true;
  95
  96         oh_device[0] = oh;
  97
  98         if (oh->dev_attr) {
  99                 oh_device[1] = omap_hwmod_lookup((
 100                 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
 101                 pdata->enable_st_clock = omap3_enable_st_clock;
 102                 count++;
 103         }
 104         pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
 105                                     sizeof(*pdata));
 106         kfree(pdata);
 107         if (IS_ERR(pdev))  {
 108                 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
 109                                         name, oh->name);
 110                 return PTR_ERR(pdev);
 111         }
 112         return 0;
 113 }
 114
 115 static int __init omap2_mcbsp_init(void)
 116 {
 117         if (!of_have_populated_dt())
 118                 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
 119
 120         return 0;
 121 }
 122 omap_arch_initcall(omap2_mcbsp_init);