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 /* McBSP internal signal muxing functions */ 31 32 void omap2_mcbsp1_mux_clkr_src(u8 mux) 33 { 34 u32 v; 35 36 v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0); 37 if (mux == CLKR_SRC_CLKR) 38 v &= ~OMAP2_MCBSP1_CLKR_MASK; 39 else if (mux == CLKR_SRC_CLKX) 40 v |= OMAP2_MCBSP1_CLKR_MASK; 41 omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0); 42 } 43 EXPORT_SYMBOL(omap2_mcbsp1_mux_clkr_src); 44 45 void omap2_mcbsp1_mux_fsr_src(u8 mux) 46 { 47 u32 v; 48 49 v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0); 50 if (mux == FSR_SRC_FSR) 51 v &= ~OMAP2_MCBSP1_FSR_MASK; 52 else if (mux == FSR_SRC_FSX) 53 v |= OMAP2_MCBSP1_FSR_MASK; 54 omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0); 55 } 56 EXPORT_SYMBOL(omap2_mcbsp1_mux_fsr_src); 57 58 /* McBSP CLKS source switching function */ 59 60 int omap2_mcbsp_set_clks_src(u8 id, u8 fck_src_id) 61 { 62 struct omap_mcbsp *mcbsp; 63 struct clk *fck_src; 64 char *fck_src_name; 65 int r; 66 67 if (!omap_mcbsp_check_valid_id(id)) { 68 pr_err("%s: Invalid id (%d)\n", __func__, id + 1); 69 return -EINVAL; 70 } 71 mcbsp = id_to_mcbsp_ptr(id); 72 73 if (fck_src_id == MCBSP_CLKS_PAD_SRC) 74 fck_src_name = "pad_fck"; 75 else if (fck_src_id == MCBSP_CLKS_PRCM_SRC) 76 fck_src_name = "prcm_fck"; 77 else 78 return -EINVAL; 79 80 fck_src = clk_get(mcbsp->dev, fck_src_name); 81 if (IS_ERR_OR_NULL(fck_src)) { 82 pr_err("omap-mcbsp: %s: could not clk_get() %s\n", "clks", 83 fck_src_name); 84 return -EINVAL; 85 } 86 87 pm_runtime_put_sync(mcbsp->dev); 88 89 r = clk_set_parent(mcbsp->fclk, fck_src); 90 if (IS_ERR_VALUE(r)) { 91 pr_err("omap-mcbsp: %s: could not clk_set_parent() to %s\n", 92 "clks", fck_src_name); 93 clk_put(fck_src); 94 return -EINVAL; 95 } 96 97 pm_runtime_get_sync(mcbsp->dev); 98 99 clk_put(fck_src); 100 101 return 0; 102 } 103 EXPORT_SYMBOL(omap2_mcbsp_set_clks_src); 104 105 struct omap_device_pm_latency omap2_mcbsp_latency[] = { 106 { 107 .deactivate_func = omap_device_idle_hwmods, 108 .activate_func = omap_device_enable_hwmods, 109 .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST, 110 }, 111 }; 112 113 static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused) 114 { 115 int id, count = 1; 116 char *name = "omap-mcbsp"; 117 struct omap_hwmod *oh_device[2]; 118 struct omap_mcbsp_platform_data *pdata = NULL; 119 struct omap_device *od; 120 121 sscanf(oh->name, "mcbsp%d", &id); 122 123 pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL); 124 if (!pdata) { 125 pr_err("%s: No memory for mcbsp\n", __func__); 126 return -ENOMEM; 127 } 128 129 pdata->mcbsp_config_type = oh->class->rev; 130 131 if (oh->class->rev == MCBSP_CONFIG_TYPE3) { 132 if (id == 2) 133 /* The FIFO has 1024 + 256 locations */ 134 pdata->buffer_size = 0x500; 135 else 136 /* The FIFO has 128 locations */ 137 pdata->buffer_size = 0x80; 138 } 139 140 oh_device[0] = oh; 141 142 if (oh->dev_attr) { 143 oh_device[1] = omap_hwmod_lookup(( 144 (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone); 145 count++; 146 } 147 od = omap_device_build_ss(name, id, oh_device, count, pdata, 148 sizeof(*pdata), omap2_mcbsp_latency, 149 ARRAY_SIZE(omap2_mcbsp_latency), false); 150 kfree(pdata); 151 if (IS_ERR(od)) { 152 pr_err("%s: Can't build omap_device for %s:%s.\n", __func__, 153 name, oh->name); 154 return PTR_ERR(od); 155 } 156 omap_mcbsp_count++; 157 return 0; 158 } 159 160 static int __init omap2_mcbsp_init(void) 161 { 162 omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL); 163 164 mcbsp_ptr = kzalloc(omap_mcbsp_count * sizeof(struct omap_mcbsp *), 165 GFP_KERNEL); 166 if (!mcbsp_ptr) 167 return -ENOMEM; 168 169 return omap_mcbsp_init(); 170 } 171 arch_initcall(omap2_mcbsp_init); 172