| 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); |