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 29 /* 30 * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle. 31 * Sidetone needs non-gated ICLK and sidetone autoidle is broken. 32 */ 33 #include "cm3xxx.h" 34 #include "cm-regbits-34xx.h" 35 36 static int omap3_enable_st_clock(unsigned int id, bool enable) 37 { 38 unsigned int w; 39 40 /* 41 * Sidetone uses McBSP ICLK - which must not idle when sidetones 42 * are enabled or sidetones start sounding ugly. 43 */ 44 w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE); 45 if (enable) 46 w &= ~(1 << (id - 2)); 47 else 48 w |= 1 << (id - 2); 49 omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE); 50 51 return 0; 52 } 53 54 static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused) 55 { 56 int id, count = 1; 57 char *name = "omap-mcbsp"; 58 struct omap_hwmod *oh_device[2]; 59 struct omap_mcbsp_platform_data *pdata = NULL; 60 struct platform_device *pdev; 61 62 sscanf(oh->name, "mcbsp%d", &id); 63 64 pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL); 65 if (!pdata) { 66 pr_err("%s: No memory for mcbsp\n", __func__); 67 return -ENOMEM; 68 } 69 70 pdata->reg_step = 4; 71 if (oh->class->rev < MCBSP_CONFIG_TYPE2) { 72 pdata->reg_size = 2; 73 } else { 74 pdata->reg_size = 4; 75 pdata->has_ccr = true; 76 } 77 78 if (oh->class->rev == MCBSP_CONFIG_TYPE2) { 79 /* The FIFO has 128 locations */ 80 pdata->buffer_size = 0x80; 81 } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) { 82 if (id == 2) 83 /* The FIFO has 1024 + 256 locations */ 84 pdata->buffer_size = 0x500; 85 else 86 /* The FIFO has 128 locations */ 87 pdata->buffer_size = 0x80; 88 } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) { 89 /* The FIFO has 128 locations for all instances */ 90 pdata->buffer_size = 0x80; 91 } 92 93 if (oh->class->rev >= MCBSP_CONFIG_TYPE3) 94 pdata->has_wakeup = true; 95 96 oh_device[0] = oh; 97 98 if (oh->dev_attr) { 99 oh_device[1] = omap_hwmod_lookup(( 100 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone); 101 pdata->enable_st_clock = omap3_enable_st_clock; 102 count++; 103 } 104 pdev = omap_device_build_ss(name, id, oh_device, count, pdata, 105 sizeof(*pdata)); 106 kfree(pdata); 107 if (IS_ERR(pdev)) { 108 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__, 109 name, oh->name); 110 return PTR_ERR(pdev); 111 } 112 return 0; 113 } 114 115 static int __init omap2_mcbsp_init(void) 116 { 117 if (!of_have_populated_dt()) 118 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL); 119 120 return 0; 121 } 122 omap_arch_initcall(omap2_mcbsp_init); 123