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