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/platform_device.h>
  19 #include <linux/slab.h>
  20
  21 #include <mach/irqs.h>
  22 #include <plat/dma.h>
  23 #include <plat/cpu.h>
  24 #include <plat/mcbsp.h>
  25 #include <plat/omap_device.h>
  26 #include <linux/pm_runtime.h>
  27
  28 #include "control.h"
  29
  30 /* McBSP internal signal muxing functions */
  31
  32 void omap2_mcbsp1_mux_clkr_src(u8 mux)
  33 {
  34         u32 v;
  35
  36         v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
  37         if (mux == CLKR_SRC_CLKR)
  38                 v &= ~OMAP2_MCBSP1_CLKR_MASK;
  39         else if (mux == CLKR_SRC_CLKX)
  40                 v |= OMAP2_MCBSP1_CLKR_MASK;
  41         omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
  42 }
  43 EXPORT_SYMBOL(omap2_mcbsp1_mux_clkr_src);
  44
  45 void omap2_mcbsp1_mux_fsr_src(u8 mux)
  46 {
  47         u32 v;
  48
  49         v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
  50         if (mux == FSR_SRC_FSR)
  51                 v &= ~OMAP2_MCBSP1_FSR_MASK;
  52         else if (mux == FSR_SRC_FSX)
  53                 v |= OMAP2_MCBSP1_FSR_MASK;
  54         omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
  55 }
  56 EXPORT_SYMBOL(omap2_mcbsp1_mux_fsr_src);
  57
  58 /* McBSP CLKS source switching function */
  59
  60 int omap2_mcbsp_set_clks_src(u8 id, u8 fck_src_id)
  61 {
  62         struct omap_mcbsp *mcbsp;
  63         struct clk *fck_src;
  64         char *fck_src_name;
  65         int r;
  66
  67         if (!omap_mcbsp_check_valid_id(id)) {
  68                 pr_err("%s: Invalid id (%d)\n", __func__, id + 1);
  69                 return -EINVAL;
  70         }
  71         mcbsp = id_to_mcbsp_ptr(id);
  72
  73         if (fck_src_id == MCBSP_CLKS_PAD_SRC)
  74                 fck_src_name = "pad_fck";
  75         else if (fck_src_id == MCBSP_CLKS_PRCM_SRC)
  76                 fck_src_name = "prcm_fck";
  77         else
  78                 return -EINVAL;
  79
  80         fck_src = clk_get(mcbsp->dev, fck_src_name);
  81         if (IS_ERR_OR_NULL(fck_src)) {
  82                 pr_err("omap-mcbsp: %s: could not clk_get() %s\n", "clks",
  83                        fck_src_name);
  84                 return -EINVAL;
  85         }
  86
  87         pm_runtime_put_sync(mcbsp->dev);
  88
  89         r = clk_set_parent(mcbsp->fclk, fck_src);
  90         if (IS_ERR_VALUE(r)) {
  91                 pr_err("omap-mcbsp: %s: could not clk_set_parent() to %s\n",
  92                        "clks", fck_src_name);
  93                 clk_put(fck_src);
  94                 return -EINVAL;
  95         }
  96
  97         pm_runtime_get_sync(mcbsp->dev);
  98
  99         clk_put(fck_src);
 100
 101         return 0;
 102 }
 103 EXPORT_SYMBOL(omap2_mcbsp_set_clks_src);
 104
 105 struct omap_device_pm_latency omap2_mcbsp_latency[] = {
 106         {
 107                 .deactivate_func = omap_device_idle_hwmods,
 108                 .activate_func   = omap_device_enable_hwmods,
 109                 .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
 110         },
 111 };
 112
 113 static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
 114 {
 115         int id, count = 1;
 116         char *name = "omap-mcbsp";
 117         struct omap_hwmod *oh_device[2];
 118         struct omap_mcbsp_platform_data *pdata = NULL;
 119         struct omap_device *od;
 120
 121         sscanf(oh->name, "mcbsp%d", &id);
 122
 123         pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
 124         if (!pdata) {
 125                 pr_err("%s: No memory for mcbsp\n", __func__);
 126                 return -ENOMEM;
 127         }
 128
 129         pdata->mcbsp_config_type = oh->class->rev;
 130
 131         if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
 132                 if (id == 2)
 133                         /* The FIFO has 1024 + 256 locations */
 134                         pdata->buffer_size = 0x500;
 135                 else
 136                         /* The FIFO has 128 locations */
 137                         pdata->buffer_size = 0x80;
 138         }
 139
 140         oh_device[0] = oh;
 141
 142         if (oh->dev_attr) {
 143                 oh_device[1] = omap_hwmod_lookup((
 144                 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
 145                 count++;
 146         }
 147         od = omap_device_build_ss(name, id, oh_device, count, pdata,
 148                                 sizeof(*pdata), omap2_mcbsp_latency,
 149                                 ARRAY_SIZE(omap2_mcbsp_latency), false);
 150         kfree(pdata);
 151         if (IS_ERR(od))  {
 152                 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
 153                                         name, oh->name);
 154                 return PTR_ERR(od);
 155         }
 156         omap_mcbsp_count++;
 157         return 0;
 158 }
 159
 160 static int __init omap2_mcbsp_init(void)
 161 {
 162         omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
 163
 164         mcbsp_ptr = kzalloc(omap_mcbsp_count * sizeof(struct omap_mcbsp *),
 165                                                                 GFP_KERNEL);
 166         if (!mcbsp_ptr)
 167                 return -ENOMEM;
 168
 169         return omap_mcbsp_init();
 170 }
 171 arch_initcall(omap2_mcbsp_init);