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 23 #include <plat/dma.h> 24 #include <plat/omap_device.h> 25 #include <linux/pm_runtime.h> 26 27 /* 28 * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle. 29 * Sidetone needs non-gated ICLK and sidetone autoidle is broken. 30 */ 31 #include "cm2xxx_3xxx.h" 32 #include "cm-regbits-34xx.h" 33 34 static int omap3_enable_st_clock(unsigned int id, bool enable) 35 { 36 unsigned int w; 37 38 /* 39 * Sidetone uses McBSP ICLK - which must not idle when sidetones 40 * are enabled or sidetones start sounding ugly. 41 */ 42 w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE); 43 if (enable) 44 w &= ~(1 << (id - 2)); 45 else 46 w |= 1 << (id - 2); 47 omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE); 48 49 return 0; 50 } 51 52 static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused) 53 { 54 int id, count = 1; 55 char *name = "omap-mcbsp"; 56 struct omap_hwmod *oh_device[2]; 57 struct omap_mcbsp_platform_data *pdata = NULL; 58 struct platform_device *pdev; 59 60 sscanf(oh->name, "mcbsp%d", &id); 61 62 pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL); 63 if (!pdata) { 64 pr_err("%s: No memory for mcbsp\n", __func__); 65 return -ENOMEM; 66 } 67 68 pdata->reg_step = 4; 69 if (oh->class->rev < MCBSP_CONFIG_TYPE2) { 70 pdata->reg_size = 2; 71 } else { 72 pdata->reg_size = 4; 73 pdata->has_ccr = true; 74 } 75 76 if (oh->class->rev == MCBSP_CONFIG_TYPE2) { 77 /* The FIFO has 128 locations */ 78 pdata->buffer_size = 0x80; 79 } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) { 80 if (id == 2) 81 /* The FIFO has 1024 + 256 locations */ 82 pdata->buffer_size = 0x500; 83 else 84 /* The FIFO has 128 locations */ 85 pdata->buffer_size = 0x80; 86 } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) { 87 /* The FIFO has 128 locations for all instances */ 88 pdata->buffer_size = 0x80; 89 } 90 91 if (oh->class->rev >= MCBSP_CONFIG_TYPE3) 92 pdata->has_wakeup = true; 93 94 oh_device[0] = oh; 95 96 if (oh->dev_attr) { 97 oh_device[1] = omap_hwmod_lookup(( 98 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone); 99 pdata->enable_st_clock = omap3_enable_st_clock; 100 count++; 101 } 102 pdev = omap_device_build_ss(name, id, oh_device, count, pdata, 103 sizeof(*pdata), NULL, 0, false); 104 kfree(pdata); 105 if (IS_ERR(pdev)) { 106 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__, 107 name, oh->name); 108 return PTR_ERR(pdev); 109 } 110 return 0; 111 } 112 113 static int __init omap2_mcbsp_init(void) 114 { 115 if (!of_have_populated_dt()) 116 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL); 117 118 return 0; 119 } 120 arch_initcall(omap2_mcbsp_init); 121