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