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 struct clk *mcbsp_iclks[5];
  38
  39 static int omap3_enable_st_clock(unsigned int id, bool enable)
  40 {
  41         /*
  42          * Sidetone uses McBSP ICLK - which must not idle when sidetones
  43          * are enabled or sidetones start sounding ugly.
  44          */
  45         if (enable)
  46                 return omap2_clk_deny_idle(mcbsp_iclks[id]);
  47         else
  48                 return omap2_clk_allow_idle(mcbsp_iclks[id]);
  49 }
  50
  51 static int omap3_mcbsp_force_ick_on(struct clk *clk, bool force_on)
  52 {
  53         if (!clk)
  54                 return 0;
  55
  56         if (force_on)
  57                 return omap2_clk_deny_idle(clk);
  58         else
  59                 return omap2_clk_allow_idle(clk);
  60 }
  61
  62 void __init omap3_mcbsp_init_pdata_callback(
  63                                         struct omap_mcbsp_platform_data *pdata)
  64 {
  65         if (!pdata)
  66                 return;
  67
  68         pdata->force_ick_on = omap3_mcbsp_force_ick_on;
  69 }
  70
  71 static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
  72 {
  73         int id, count = 1;
  74         char *name = "omap-mcbsp";
  75         struct omap_hwmod *oh_device[2];
  76         struct omap_mcbsp_platform_data *pdata = NULL;
  77         struct platform_device *pdev;
  78         char clk_name[11];
  79
  80         sscanf(oh->name, "mcbsp%d", &id);
  81
  82         pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
  83         if (!pdata) {
  84                 pr_err("%s: No memory for mcbsp\n", __func__);
  85                 return -ENOMEM;
  86         }
  87
  88         pdata->reg_step = 4;
  89         if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
  90                 pdata->reg_size = 2;
  91         } else {
  92                 pdata->reg_size = 4;
  93                 pdata->has_ccr = true;
  94         }
  95
  96         if (oh->class->rev == MCBSP_CONFIG_TYPE2) {
  97                 /* The FIFO has 128 locations */
  98                 pdata->buffer_size = 0x80;
  99         } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
 100                 if (id == 2)
 101                         /* The FIFO has 1024 + 256 locations */
 102                         pdata->buffer_size = 0x500;
 103                 else
 104                         /* The FIFO has 128 locations */
 105                         pdata->buffer_size = 0x80;
 106         } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
 107                 /* The FIFO has 128 locations for all instances */
 108                 pdata->buffer_size = 0x80;
 109         }
 110
 111         if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
 112                 pdata->has_wakeup = true;
 113
 114         oh_device[0] = oh;
 115
 116         if (oh->dev_attr) {
 117                 oh_device[1] = omap_hwmod_lookup((
 118                 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
 119                 pdata->enable_st_clock = omap3_enable_st_clock;
 120                 pdata->force_ick_on = omap3_mcbsp_force_ick_on;
 121                 sprintf(clk_name, "mcbsp%d_ick", id);
 122                 mcbsp_iclks[id] = clk_get(NULL, clk_name);
 123                 count++;
 124         }
 125         pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
 126                                     sizeof(*pdata));
 127         kfree(pdata);
 128         if (IS_ERR(pdev))  {
 129                 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
 130                                         name, oh->name);
 131                 return PTR_ERR(pdev);
 132         }
 133         return 0;
 134 }
 135
 136 static int __init omap2_mcbsp_init(void)
 137 {
 138         if (!of_have_populated_dt())
 139                 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
 140
 141         return 0;
 142 }
 143 omap_arch_initcall(omap2_mcbsp_init);