From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/arm/mach-omap2/mcbsp.c | 122 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 arch/arm/mach-omap2/mcbsp.c

(limited to 'arch/arm/mach-omap2/mcbsp.c')

diff --git a/arch/arm/mach-omap2/mcbsp.c b/arch/arm/mach-omap2/mcbsp.c
new file mode 100644
index 00000000..5d876807
--- /dev/null
+++ b/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"
+
+/*
+ * 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 int omap3_enable_st_clock(unsigned int id, bool enable)
+{
+	unsigned int w;
+
+	/*
+	 * Sidetone uses McBSP ICLK - which must not idle when sidetones
+	 * are enabled or sidetones start sounding ugly.
+	 */
+	w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
+	if (enable)
+		w &= ~(1 << (id - 2));
+	else
+		w |= 1 << (id - 2);
+	omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
+
+	return 0;
+}
+
+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;
+
+	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;
+		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);
-- 
cgit v1.3.1