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 /*
  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 "cm2xxx_3xxx.h"
  35 #include "cm-regbits-34xx.h"
  36
  37 /* McBSP internal signal muxing function */
  38 static int omap2_mcbsp1_mux_rx_clk(struct device *dev, const char *signal,
  39                                    const char *src)
  40 {
  41         u32 v;
  42
  43         v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
  44
  45         if (!strcmp(signal, "clkr")) {
  46                 if (!strcmp(src, "clkr"))
  47                         v &= ~OMAP2_MCBSP1_CLKR_MASK;
  48                 else if (!strcmp(src, "clkx"))
  49                         v |= OMAP2_MCBSP1_CLKR_MASK;
  50                 else
  51                         return -EINVAL;
  52         } else if (!strcmp(signal, "fsr")) {
  53                 if (!strcmp(src, "fsr"))
  54                         v &= ~OMAP2_MCBSP1_FSR_MASK;
  55                 else if (!strcmp(src, "fsx"))
  56                         v |= OMAP2_MCBSP1_FSR_MASK;
  57                 else
  58                         return -EINVAL;
  59         } else {
  60                 return -EINVAL;
  61         }
  62
  63         omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
  64
  65         return 0;
  66 }
  67
  68 /* McBSP CLKS source switching function */
  69 static int omap2_mcbsp_set_clk_src(struct device *dev, struct clk *clk,
  70                                    const char *src)
  71 {
  72         struct clk *fck_src;
  73         char *fck_src_name;
  74         int r;
  75
  76         if (!strcmp(src, "clks_ext"))
  77                 fck_src_name = "pad_fck";
  78         else if (!strcmp(src, "clks_fclk"))
  79                 fck_src_name = "prcm_fck";
  80         else
  81                 return -EINVAL;
  82
  83         fck_src = clk_get(dev, fck_src_name);
  84         if (IS_ERR_OR_NULL(fck_src)) {
  85                 pr_err("omap-mcbsp: %s: could not clk_get() %s\n", "clks",
  86                        fck_src_name);
  87                 return -EINVAL;
  88         }
  89
  90         pm_runtime_put_sync(dev);
  91
  92         r = clk_set_parent(clk, fck_src);
  93         if (IS_ERR_VALUE(r)) {
  94                 pr_err("omap-mcbsp: %s: could not clk_set_parent() to %s\n",
  95                        "clks", fck_src_name);
  96                 clk_put(fck_src);
  97                 return -EINVAL;
  98         }
  99
 100         pm_runtime_get_sync(dev);
 101
 102         clk_put(fck_src);
 103
 104         return 0;
 105 }
 106
 107 static int omap3_enable_st_clock(unsigned int id, bool enable)
 108 {
 109         unsigned int w;
 110
 111         /*
 112          * Sidetone uses McBSP ICLK - which must not idle when sidetones
 113          * are enabled or sidetones start sounding ugly.
 114          */
 115         w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
 116         if (enable)
 117                 w &= ~(1 << (id - 2));
 118         else
 119                 w |= 1 << (id - 2);
 120         omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
 121
 122         return 0;
 123 }
 124
 125 static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
 126 {
 127         int id, count = 1;
 128         char *name = "omap-mcbsp";
 129         struct omap_hwmod *oh_device[2];
 130         struct omap_mcbsp_platform_data *pdata = NULL;
 131         struct platform_device *pdev;
 132
 133         sscanf(oh->name, "mcbsp%d", &id);
 134
 135         pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
 136         if (!pdata) {
 137                 pr_err("%s: No memory for mcbsp\n", __func__);
 138                 return -ENOMEM;
 139         }
 140
 141         pdata->reg_step = 4;
 142         if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
 143                 pdata->reg_size = 2;
 144         } else {
 145                 pdata->reg_size = 4;
 146                 pdata->has_ccr = true;
 147         }
 148
 149         if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
 150                 if (id == 2)
 151                         /* The FIFO has 1024 + 256 locations */
 152                         pdata->buffer_size = 0x500;
 153                 else
 154                         /* The FIFO has 128 locations */
 155                         pdata->buffer_size = 0x80;
 156         }
 157
 158         if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
 159                 pdata->has_wakeup = true;
 160
 161         oh_device[0] = oh;
 162
 163         if (oh->dev_attr) {
 164                 oh_device[1] = omap_hwmod_lookup((
 165                 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
 166                 pdata->enable_st_clock = omap3_enable_st_clock;
 167                 count++;
 168         }
 169         pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
 170                                 sizeof(*pdata), NULL, 0, false);
 171         kfree(pdata);
 172         if (IS_ERR(pdev))  {
 173                 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
 174                                         name, oh->name);
 175                 return PTR_ERR(pdev);
 176         }
 177         pdata->set_clk_src = omap2_mcbsp_set_clk_src;
 178         if (id == 1)
 179                 pdata->mux_signal = omap2_mcbsp1_mux_rx_clk;
 180         omap_mcbsp_count++;
 181         return 0;
 182 }
 183
 184 static int __init omap2_mcbsp_init(void)
 185 {
 186         omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
 187
 188         mcbsp_ptr = kzalloc(omap_mcbsp_count * sizeof(struct omap_mcbsp *),
 189                                                                 GFP_KERNEL);
 190         if (!mcbsp_ptr)
 191                 return -ENOMEM;
 192
 193         return omap_mcbsp_init();
 194 }
 195 arch_initcall(omap2_mcbsp_init);