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 "omap_device.h" 27 28 /* 29 * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle. 30 * Sidetone needs non-gated ICLK and sidetone autoidle is broken. 31 */ 32 #include "cm3xxx.h" 33 #include "cm-regbits-34xx.h" 34 35 static int omap3_enable_st_clock(unsigned int id, bool enable) 36 { 37 unsigned int w; 38 39 /* 40 * Sidetone uses McBSP ICLK - which must not idle when sidetones 41 * are enabled or sidetones start sounding ugly. 42 */ 43 w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE); 44 if (enable) 45 w &= ~(1 << (id - 2)); 46 else 47 w |= 1 << (id - 2); 48 omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE); 49 50 return 0; 51 } 52 53 static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused) 54 { 55 int id, count = 1; 56 char *name = "omap-mcbsp"; 57 struct omap_hwmod *oh_device[2]; 58 struct omap_mcbsp_platform_data *pdata = NULL; 59 struct platform_device *pdev; 60 61 sscanf(oh->name, "mcbsp%d", &id); 62 63 pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL); 64 if (!pdata) { 65 pr_err("%s: No memory for mcbsp\n", __func__); 66 return -ENOMEM; 67 } 68 69 pdata->reg_step = 4; 70 if (oh->class->rev < MCBSP_CONFIG_TYPE2) { 71 pdata->reg_size = 2; 72 } else { 73 pdata->reg_size = 4; 74 pdata->has_ccr = true; 75 } 76 77 if (oh->class->rev == MCBSP_CONFIG_TYPE2) { 78 /* The FIFO has 128 locations */ 79 pdata->buffer_size = 0x80; 80 } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) { 81 if (id == 2) 82 /* The FIFO has 1024 + 256 locations */ 83 pdata->buffer_size = 0x500; 84 else 85 /* The FIFO has 128 locations */ 86 pdata->buffer_size = 0x80; 87 } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) { 88 /* The FIFO has 128 locations for all instances */ 89 pdata->buffer_size = 0x80; 90 } 91 92 if (oh->class->rev >= MCBSP_CONFIG_TYPE3) 93 pdata->has_wakeup = true; 94 95 oh_device[0] = oh; 96 97 if (oh->dev_attr) { 98 oh_device[1] = omap_hwmod_lookup(( 99 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone); 100 pdata->enable_st_clock = omap3_enable_st_clock; 101 count++; 102 } 103 pdev = omap_device_build_ss(name, id, oh_device, count, pdata, 104 sizeof(*pdata), NULL, 0, false); 105 kfree(pdata); 106 if (IS_ERR(pdev)) { 107 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__, 108 name, oh->name); 109 return PTR_ERR(pdev); 110 } 111 return 0; 112 } 113 114 static int __init omap2_mcbsp_init(void) 115 { 116 if (!of_have_populated_dt()) 117 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL); 118 119 return 0; 120 } 121 arch_initcall(omap2_mcbsp_init); 122