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 #include "clock.h"
  29
  30 /*
  31  * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
  32  * Sidetone needs non-gated ICLK and sidetone autoidle is broken.
  33  */
  34 #include "cm3xxx.h"
  35 #include "cm-regbits-34xx.h"
  36
  37 static int omap3_mcbsp_force_ick_on(struct clk *clk, bool force_on)
  38 {
  39         if (!clk)
  40                 return 0;
  41
  42         if (force_on)
  43                 return omap2_clk_deny_idle(clk);
  44         else
  45                 return omap2_clk_allow_idle(clk);
  46 }
  47
  48 void __init omap3_mcbsp_init_pdata_callback(
  49                                         struct omap_mcbsp_platform_data *pdata)
  50 {
  51         if (!pdata)
  52                 return;
  53
  54         pdata->force_ick_on = omap3_mcbsp_force_ick_on;
  55 }
  56
  57 static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
  58 {
  59         int id, count = 1;
  60         char *name = "omap-mcbsp";
  61         struct omap_hwmod *oh_device[2];
  62         struct omap_mcbsp_platform_data *pdata = NULL;
  63         struct platform_device *pdev;
  64
  65         sscanf(oh->name, "mcbsp%d", &id);
  66
  67         pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
  68         if (!pdata) {
  69                 pr_err("%s: No memory for mcbsp\n", __func__);
  70                 return -ENOMEM;
  71         }
  72
  73         pdata->reg_step = 4;
  74         if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
  75                 pdata->reg_size = 2;
  76         } else {
  77                 pdata->reg_size = 4;
  78                 pdata->has_ccr = true;
  79         }
  80
  81         if (oh->class->rev == MCBSP_CONFIG_TYPE2) {
  82                 /* The FIFO has 128 locations */
  83                 pdata->buffer_size = 0x80;
  84         } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
  85                 if (id == 2)
  86                         /* The FIFO has 1024 + 256 locations */
  87                         pdata->buffer_size = 0x500;
  88                 else
  89                         /* The FIFO has 128 locations */
  90                         pdata->buffer_size = 0x80;
  91         } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
  92                 /* The FIFO has 128 locations for all instances */
  93                 pdata->buffer_size = 0x80;
  94         }
  95
  96         if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
  97                 pdata->has_wakeup = true;
  98
  99         oh_device[0] = oh;
 100
 101         if (oh->dev_attr) {
 102                 oh_device[1] = omap_hwmod_lookup((
 103                 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
 104                 pdata->force_ick_on = omap3_mcbsp_force_ick_on;
 105                 count++;
 106         }
 107         pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
 108                                     sizeof(*pdata));
 109         kfree(pdata);
 110         if (IS_ERR(pdev))  {
 111                 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
 112                                         name, oh->name);
 113                 return PTR_ERR(pdev);
 114         }
 115         return 0;
 116 }
 117
 118 static int __init omap2_mcbsp_init(void)
 119 {
 120         if (!of_have_populated_dt())
 121                 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
 122
 123         return 0;
 124 }
 125 omap_arch_initcall(omap2_mcbsp_init);