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Diffstat (limited to 'kernel/arch/arm/mach-omap2/mcbsp.c')
-rw-r--r--kernel/arch/arm/mach-omap2/mcbsp.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-omap2/mcbsp.c b/kernel/arch/arm/mach-omap2/mcbsp.c
new file mode 100644
index 000000000..b4ac3af11
--- /dev/null
+++ b/kernel/arch/arm/mach-omap2/mcbsp.c
@@ -0,0 +1,122 @@
+/*
+ * linux/arch/arm/mach-omap2/mcbsp.c
+ *
+ * Copyright (C) 2008 Instituto Nokia de Tecnologia
+ * Contact: Eduardo Valentin <eduardo.valentin@indt.org.br>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Multichannel mode not supported.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/platform_data/asoc-ti-mcbsp.h>
+#include <linux/pm_runtime.h>
+
+#include <linux/omap-dma.h>
+
+#include "soc.h"
+#include "omap_device.h"
+#include "clock.h"
+
+/*
+ * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
+ * Sidetone needs non-gated ICLK and sidetone autoidle is broken.
+ */
+#include "cm3xxx.h"
+#include "cm-regbits-34xx.h"
+
+static struct clk *mcbsp_iclks[5];
+
+static int omap3_enable_st_clock(unsigned int id, bool enable)
+{
+ /*
+ * Sidetone uses McBSP ICLK - which must not idle when sidetones
+ * are enabled or sidetones start sounding ugly.
+ */
+ if (enable)
+ return omap2_clk_deny_idle(mcbsp_iclks[id]);
+ else
+ return omap2_clk_allow_idle(mcbsp_iclks[id]);
+}
+
+static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
+{
+ int id, count = 1;
+ char *name = "omap-mcbsp";
+ struct omap_hwmod *oh_device[2];
+ struct omap_mcbsp_platform_data *pdata = NULL;
+ struct platform_device *pdev;
+ char clk_name[11];
+
+ sscanf(oh->name, "mcbsp%d", &id);
+
+ pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
+ if (!pdata) {
+ pr_err("%s: No memory for mcbsp\n", __func__);
+ return -ENOMEM;
+ }
+
+ pdata->reg_step = 4;
+ if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
+ pdata->reg_size = 2;
+ } else {
+ pdata->reg_size = 4;
+ pdata->has_ccr = true;
+ }
+
+ if (oh->class->rev == MCBSP_CONFIG_TYPE2) {
+ /* The FIFO has 128 locations */
+ pdata->buffer_size = 0x80;
+ } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
+ if (id == 2)
+ /* The FIFO has 1024 + 256 locations */
+ pdata->buffer_size = 0x500;
+ else
+ /* The FIFO has 128 locations */
+ pdata->buffer_size = 0x80;
+ } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
+ /* The FIFO has 128 locations for all instances */
+ pdata->buffer_size = 0x80;
+ }
+
+ if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
+ pdata->has_wakeup = true;
+
+ oh_device[0] = oh;
+
+ if (oh->dev_attr) {
+ oh_device[1] = omap_hwmod_lookup((
+ (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
+ pdata->enable_st_clock = omap3_enable_st_clock;
+ sprintf(clk_name, "mcbsp%d_ick", id);
+ mcbsp_iclks[id] = clk_get(NULL, clk_name);
+ count++;
+ }
+ pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
+ sizeof(*pdata));
+ kfree(pdata);
+ if (IS_ERR(pdev)) {
+ pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
+ name, oh->name);
+ return PTR_ERR(pdev);
+ }
+ return 0;
+}
+
+static int __init omap2_mcbsp_init(void)
+{
+ if (!of_have_populated_dt())
+ omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);
+
+ return 0;
+}
+omap_arch_initcall(omap2_mcbsp_init);