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 #include "clock.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 "cm3xxx.h" 35 #include "cm-regbits-34xx.h" 36 37 static struct clk *mcbsp_iclks[5]; 38 39 static int omap3_enable_st_clock(unsigned int id, bool enable) 40 { 41 /* 42 * Sidetone uses McBSP ICLK - which must not idle when sidetones 43 * are enabled or sidetones start sounding ugly. 44 */ 45 if (enable) 46 return omap2_clk_deny_idle(mcbsp_iclks[id]); 47 else 48 return omap2_clk_allow_idle(mcbsp_iclks[id]); 49 } 50 51 static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused) 52 { 53 int id, count = 1; 54 char *name = "omap-mcbsp"; 55 struct omap_hwmod *oh_device[2]; 56 struct omap_mcbsp_platform_data *pdata = NULL; 57 struct platform_device *pdev; 58 char clk_name[11]; 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 sprintf(clk_name, "mcbsp%d_ick", id); 101 mcbsp_iclks[id] = clk_get(NULL, clk_name); 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