Initial import

1 files changed, 314 insertions, 0 deletions

diff --git a/drivers/mfd/mcp-sa11x0.c b/drivers/mfd/mcp-sa11x0.c
new file mode 100644
index 000000000..1fc458128
--- /dev/null
+++ b/drivers/mfd/mcp-sa11x0.c
@@ -0,0 +1,314 @@
+/*
+ *  linux/drivers/mfd/mcp-sa11x0.c
+ *
+ *  Copyright (C) 2001-2005 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ *
+ *  SA11x0 MCP (Multimedia Communications Port) driver.
+ *
+ *  MCP read/write timeouts from Jordi Colomer, rehacked by rmk.
+ */
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/mfd/mcp.h>
+
+#include <mach/hardware.h>
+#include <asm/mach-types.h>
+#include <linux/platform_data/mfd-mcp-sa11x0.h>
+
+#define DRIVER_NAME "sa11x0-mcp"
+
+struct mcp_sa11x0 {
+	void __iomem	*base0;
+	void __iomem	*base1;
+	u32		mccr0;
+	u32		mccr1;
+};
+
+/* Register offsets */
+#define MCCR0(m)	((m)->base0 + 0x00)
+#define MCDR0(m)	((m)->base0 + 0x08)
+#define MCDR1(m)	((m)->base0 + 0x0c)
+#define MCDR2(m)	((m)->base0 + 0x10)
+#define MCSR(m)		((m)->base0 + 0x18)
+#define MCCR1(m)	((m)->base1 + 0x00)
+
+#define priv(mcp)	((struct mcp_sa11x0 *)mcp_priv(mcp))
+
+static void
+mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
+{
+	struct mcp_sa11x0 *m = priv(mcp);
+
+	divisor /= 32;
+
+	m->mccr0 &= ~0x00007f00;
+	m->mccr0 |= divisor << 8;
+	writel_relaxed(m->mccr0, MCCR0(m));
+}
+
+static void
+mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
+{
+	struct mcp_sa11x0 *m = priv(mcp);
+
+	divisor /= 32;
+
+	m->mccr0 &= ~0x0000007f;
+	m->mccr0 |= divisor;
+	writel_relaxed(m->mccr0, MCCR0(m));
+}
+
+/*
+ * Write data to the device.  The bit should be set after 3 subframe
+ * times (each frame is 64 clocks).  We wait a maximum of 6 subframes.
+ * We really should try doing something more productive while we
+ * wait.
+ */
+static void
+mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
+{
+	struct mcp_sa11x0 *m = priv(mcp);
+	int ret = -ETIME;
+	int i;
+
+	writel_relaxed(reg << 17 | MCDR2_Wr | (val & 0xffff), MCDR2(m));
+
+	for (i = 0; i < 2; i++) {
+		udelay(mcp->rw_timeout);
+		if (readl_relaxed(MCSR(m)) & MCSR_CWC) {
+			ret = 0;
+			break;
+		}
+	}
+
+	if (ret < 0)
+		printk(KERN_WARNING "mcp: write timed out\n");
+}
+
+/*
+ * Read data from the device.  The bit should be set after 3 subframe
+ * times (each frame is 64 clocks).  We wait a maximum of 6 subframes.
+ * We really should try doing something more productive while we
+ * wait.
+ */
+static unsigned int
+mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
+{
+	struct mcp_sa11x0 *m = priv(mcp);
+	int ret = -ETIME;
+	int i;
+
+	writel_relaxed(reg << 17 | MCDR2_Rd, MCDR2(m));
+
+	for (i = 0; i < 2; i++) {
+		udelay(mcp->rw_timeout);
+		if (readl_relaxed(MCSR(m)) & MCSR_CRC) {
+			ret = readl_relaxed(MCDR2(m)) & 0xffff;
+			break;
+		}
+	}
+
+	if (ret < 0)
+		printk(KERN_WARNING "mcp: read timed out\n");
+
+	return ret;
+}
+
+static void mcp_sa11x0_enable(struct mcp *mcp)
+{
+	struct mcp_sa11x0 *m = priv(mcp);
+
+	writel(-1, MCSR(m));
+	m->mccr0 |= MCCR0_MCE;
+	writel_relaxed(m->mccr0, MCCR0(m));
+}
+
+static void mcp_sa11x0_disable(struct mcp *mcp)
+{
+	struct mcp_sa11x0 *m = priv(mcp);
+
+	m->mccr0 &= ~MCCR0_MCE;
+	writel_relaxed(m->mccr0, MCCR0(m));
+}
+
+/*
+ * Our methods.
+ */
+static struct mcp_ops mcp_sa11x0 = {
+	.set_telecom_divisor	= mcp_sa11x0_set_telecom_divisor,
+	.set_audio_divisor	= mcp_sa11x0_set_audio_divisor,
+	.reg_write		= mcp_sa11x0_write,
+	.reg_read		= mcp_sa11x0_read,
+	.enable			= mcp_sa11x0_enable,
+	.disable		= mcp_sa11x0_disable,
+};
+
+static int mcp_sa11x0_probe(struct platform_device *dev)
+{
+	struct mcp_plat_data *data = dev_get_platdata(&dev->dev);
+	struct resource *mem0, *mem1;
+	struct mcp_sa11x0 *m;
+	struct mcp *mcp;
+	int ret;
+
+	if (!data)
+		return -ENODEV;
+
+	mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
+	if (!mem0 || !mem1)
+		return -ENXIO;
+
+	if (!request_mem_region(mem0->start, resource_size(mem0),
+				DRIVER_NAME)) {
+		ret = -EBUSY;
+		goto err_mem0;
+	}
+
+	if (!request_mem_region(mem1->start, resource_size(mem1),
+				DRIVER_NAME)) {
+		ret = -EBUSY;
+		goto err_mem1;
+	}
+
+	mcp = mcp_host_alloc(&dev->dev, sizeof(struct mcp_sa11x0));
+	if (!mcp) {
+		ret = -ENOMEM;
+		goto err_alloc;
+	}
+
+	mcp->owner		= THIS_MODULE;
+	mcp->ops		= &mcp_sa11x0;
+	mcp->sclk_rate		= data->sclk_rate;
+
+	m = priv(mcp);
+	m->mccr0 = data->mccr0 | 0x7f7f;
+	m->mccr1 = data->mccr1;
+
+	m->base0 = ioremap(mem0->start, resource_size(mem0));
+	m->base1 = ioremap(mem1->start, resource_size(mem1));
+	if (!m->base0 || !m->base1) {
+		ret = -ENOMEM;
+		goto err_ioremap;
+	}
+
+	platform_set_drvdata(dev, mcp);
+
+	/*
+	 * Initialise device.  Note that we initially
+	 * set the sampling rate to minimum.
+	 */
+	writel_relaxed(-1, MCSR(m));
+	writel_relaxed(m->mccr1, MCCR1(m));
+	writel_relaxed(m->mccr0, MCCR0(m));
+
+	/*
+	 * Calculate the read/write timeout (us) from the bit clock
+	 * rate.  This is the period for 3 64-bit frames.  Always
+	 * round this time up.
+	 */
+	mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
+			  mcp->sclk_rate;
+
+	ret = mcp_host_add(mcp, data->codec_pdata);
+	if (ret == 0)
+		return 0;
+
+ err_ioremap:
+	iounmap(m->base1);
+	iounmap(m->base0);
+	mcp_host_free(mcp);
+ err_alloc:
+	release_mem_region(mem1->start, resource_size(mem1));
+ err_mem1:
+	release_mem_region(mem0->start, resource_size(mem0));
+ err_mem0:
+	return ret;
+}
+
+static int mcp_sa11x0_remove(struct platform_device *dev)
+{
+	struct mcp *mcp = platform_get_drvdata(dev);
+	struct mcp_sa11x0 *m = priv(mcp);
+	struct resource *mem0, *mem1;
+
+	if (m->mccr0 & MCCR0_MCE)
+		dev_warn(&dev->dev,
+			 "device left active (missing disable call?)\n");
+
+	mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
+
+	mcp_host_del(mcp);
+	iounmap(m->base1);
+	iounmap(m->base0);
+	mcp_host_free(mcp);
+	release_mem_region(mem1->start, resource_size(mem1));
+	release_mem_region(mem0->start, resource_size(mem0));
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mcp_sa11x0_suspend(struct device *dev)
+{
+	struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
+
+	if (m->mccr0 & MCCR0_MCE)
+		dev_warn(dev, "device left active (missing disable call?)\n");
+
+	writel(m->mccr0 & ~MCCR0_MCE, MCCR0(m));
+
+	return 0;
+}
+
+static int mcp_sa11x0_resume(struct device *dev)
+{
+	struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
+
+	writel_relaxed(m->mccr1, MCCR1(m));
+	writel_relaxed(m->mccr0, MCCR0(m));
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops mcp_sa11x0_pm_ops = {
+#ifdef CONFIG_PM_SLEEP
+	.suspend = mcp_sa11x0_suspend,
+	.freeze = mcp_sa11x0_suspend,
+	.poweroff = mcp_sa11x0_suspend,
+	.resume_noirq = mcp_sa11x0_resume,
+	.thaw_noirq = mcp_sa11x0_resume,
+	.restore_noirq = mcp_sa11x0_resume,
+#endif
+};
+
+static struct platform_driver mcp_sa11x0_driver = {
+	.probe		= mcp_sa11x0_probe,
+	.remove		= mcp_sa11x0_remove,
+	.driver		= {
+		.name	= DRIVER_NAME,
+		.pm	= &mcp_sa11x0_pm_ops,
+	},
+};
+
+/*
+ * This needs re-working
+ */
+module_platform_driver(mcp_sa11x0_driver);
+
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
+MODULE_LICENSE("GPL");