[MFD] Add SA11x0 MCP support

This adds support for the MCP interface found on SA11x0 devices.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/mfd/Kconfig

@@ -7,4 +7,10 @@ menu "Multimedia Capabilities Port drivers"
 config MCP
 	tristate
 
+# Interface drivers
+config MCP_SA11X0
+	tristate "Support SA11x0 MCP interface"
+	depends on ARCH_SA1100
+	select MCP
+
 endmenu

drivers/mfd/Makefile

@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_MCP)		+= mcp-core.o
+obj-$(CONFIG_MCP_SA11X0)	+= mcp-sa11x0.o

drivers/mfd/mcp-sa11x0.c

@@ -0,0 +1,275 @@
+/*
+ *  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/init.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+
+#include <asm/dma.h>
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+#include <asm/system.h>
+
+#include <asm/arch/assabet.h>
+
+#include "mcp.h"
+
+struct mcp_sa11x0 {
+	u32	mccr0;
+	u32	mccr1;
+};
+
+#define priv(mcp)	((struct mcp_sa11x0 *)mcp_priv(mcp))
+
+static void
+mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
+{
+	unsigned int mccr0;
+
+	divisor /= 32;
+
+	mccr0 = Ser4MCCR0 & ~0x00007f00;
+	mccr0 |= divisor << 8;
+	Ser4MCCR0 = mccr0;
+}
+
+static void
+mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
+{
+	unsigned int mccr0;
+
+	divisor /= 32;
+
+	mccr0 = Ser4MCCR0 & ~0x0000007f;
+	mccr0 |= divisor;
+	Ser4MCCR0 = mccr0;
+}
+
+/*
+ * 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)
+{
+	int ret = -ETIME;
+	int i;
+
+	Ser4MCDR2 = reg << 17 | MCDR2_Wr | (val & 0xffff);
+
+	for (i = 0; i < 2; i++) {
+		udelay(mcp->rw_timeout);
+		if (Ser4MCSR & 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)
+{
+	int ret = -ETIME;
+	int i;
+
+	Ser4MCDR2 = reg << 17 | MCDR2_Rd;
+
+	for (i = 0; i < 2; i++) {
+		udelay(mcp->rw_timeout);
+		if (Ser4MCSR & MCSR_CRC) {
+			ret = Ser4MCDR2 & 0xffff;
+			break;
+		}
+	}
+
+	if (ret < 0)
+		printk(KERN_WARNING "mcp: read timed out\n");
+
+	return ret;
+}
+
+static void mcp_sa11x0_enable(struct mcp *mcp)
+{
+	Ser4MCSR = -1;
+	Ser4MCCR0 |= MCCR0_MCE;
+}
+
+static void mcp_sa11x0_disable(struct mcp *mcp)
+{
+	Ser4MCCR0 &= ~MCCR0_MCE;
+}
+
+/*
+ * 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 device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct mcp *mcp;
+	int ret;
+
+	if (!machine_is_adsbitsy()       && !machine_is_assabet()        &&
+	    !machine_is_cerf()           && !machine_is_flexanet()       &&
+	    !machine_is_freebird()       && !machine_is_graphicsclient() &&
+	    !machine_is_graphicsmaster() && !machine_is_lart()           &&
+	    !machine_is_omnimeter()      && !machine_is_pfs168()         &&
+	    !machine_is_shannon()        && !machine_is_simpad()         &&
+	    !machine_is_yopy())
+		return -ENODEV;
+
+	if (!request_mem_region(0x80060000, 0x60, "sa11x0-mcp"))
+		return -EBUSY;
+
+	mcp = mcp_host_alloc(&pdev->dev, sizeof(struct mcp_sa11x0));
+	if (!mcp) {
+		ret = -ENOMEM;
+		goto release;
+	}
+
+	mcp->owner		= THIS_MODULE;
+	mcp->ops		= &mcp_sa11x0;
+	mcp->sclk_rate		= 11981000,
+	mcp->dma_audio_rd	= DMA_Ser4MCP0Rd;
+	mcp->dma_audio_wr	= DMA_Ser4MCP0Wr;
+	mcp->dma_telco_rd	= DMA_Ser4MCP1Rd;
+	mcp->dma_telco_wr	= DMA_Ser4MCP1Wr;
+
+	dev_set_drvdata(dev, mcp);
+
+	if (machine_is_assabet()) {
+		ASSABET_BCR_set(ASSABET_BCR_CODEC_RST);
+	}
+
+	/*
+	 * Setup the PPC unit correctly.
+	 */
+	PPDR &= ~PPC_RXD4;
+	PPDR |= PPC_TXD4 | PPC_SCLK | PPC_SFRM;
+	PSDR |= PPC_RXD4;
+	PSDR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
+	PPSR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
+
+	Ser4MCSR = -1;
+	Ser4MCCR1 = 0;
+	Ser4MCCR0 = 0x00007f7f | MCCR0_ADM;
+
+	/*
+	 * 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_register(mcp);
+	if (ret == 0)
+		goto out;
+
+ release:
+	release_mem_region(0x80060000, 0x60);
+	dev_set_drvdata(dev, NULL);
+
+ out:
+	return ret;
+}
+
+static int mcp_sa11x0_remove(struct device *dev)
+{
+	struct mcp *mcp = dev_get_drvdata(dev);
+
+	dev_set_drvdata(dev, NULL);
+	mcp_host_unregister(mcp);
+	release_mem_region(0x80060000, 0x60);
+
+	return 0;
+}
+
+static int mcp_sa11x0_suspend(struct device *dev, pm_message_t state, u32 level)
+{
+	struct mcp *mcp = dev_get_drvdata(dev);
+
+	if (level == SUSPEND_DISABLE) {
+		priv(mcp)->mccr0 = Ser4MCCR0;
+		priv(mcp)->mccr1 = Ser4MCCR1;
+		Ser4MCCR0 &= ~MCCR0_MCE;
+	}
+	return 0;
+}
+
+static int mcp_sa11x0_resume(struct device *dev, u32 level)
+{
+	struct mcp *mcp = dev_get_drvdata(dev);
+
+	if (level == RESUME_RESTORE_STATE) {
+		Ser4MCCR1 = priv(mcp)->mccr1;
+		Ser4MCCR0 = priv(mcp)->mccr0;
+	}
+	return 0;
+}
+
+/*
+ * The driver for the SA11x0 MCP port.
+ */
+static struct device_driver mcp_sa11x0_driver = {
+	.name		= "sa11x0-mcp",
+	.bus		= &platform_bus_type,
+	.probe		= mcp_sa11x0_probe,
+	.remove		= mcp_sa11x0_remove,
+	.suspend	= mcp_sa11x0_suspend,
+	.resume		= mcp_sa11x0_resume,
+};
+
+/*
+ * This needs re-working
+ */
+static int __init mcp_sa11x0_init(void)
+{
+	return driver_register(&mcp_sa11x0_driver);
+}
+
+static void __exit mcp_sa11x0_exit(void)
+{
+	driver_unregister(&mcp_sa11x0_driver);
+}
+
+module_init(mcp_sa11x0_init);
+module_exit(mcp_sa11x0_exit);
+
+MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
+MODULE_LICENSE("GPL");