summaryrefslogtreecommitdiff
path: root/drivers/mfd
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/Kconfig16
-rw-r--r--drivers/mfd/Makefile6
-rw-r--r--drivers/mfd/mcp-core.c255
-rw-r--r--drivers/mfd/mcp-sa11x0.c275
-rw-r--r--drivers/mfd/mcp.h66
5 files changed, 618 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
new file mode 100644
index 000000000000..1588a59e3767
--- /dev/null
+++ b/drivers/mfd/Kconfig
@@ -0,0 +1,16 @@
+#
+# Multifunction miscellaneous devices
+#
+
+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
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
new file mode 100644
index 000000000000..98bdd6a42188
--- /dev/null
+++ b/drivers/mfd/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for multifunction miscellaneous devices
+#
+
+obj-$(CONFIG_MCP) += mcp-core.o
+obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o
diff --git a/drivers/mfd/mcp-core.c b/drivers/mfd/mcp-core.c
new file mode 100644
index 000000000000..c75d713c01e4
--- /dev/null
+++ b/drivers/mfd/mcp-core.c
@@ -0,0 +1,255 @@
+/*
+ * linux/drivers/mfd/mcp-core.c
+ *
+ * Copyright (C) 2001 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.
+ *
+ * Generic MCP (Multimedia Communications Port) layer. All MCP locking
+ * is solely held within this file.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+#include <linux/device.h>
+
+#include <asm/dma.h>
+#include <asm/system.h>
+
+#include "mcp.h"
+
+#define to_mcp(d) container_of(d, struct mcp, attached_device)
+#define to_mcp_driver(d) container_of(d, struct mcp_driver, drv)
+
+static int mcp_bus_match(struct device *dev, struct device_driver *drv)
+{
+ return 1;
+}
+
+static int mcp_bus_probe(struct device *dev)
+{
+ struct mcp *mcp = to_mcp(dev);
+ struct mcp_driver *drv = to_mcp_driver(dev->driver);
+
+ return drv->probe(mcp);
+}
+
+static int mcp_bus_remove(struct device *dev)
+{
+ struct mcp *mcp = to_mcp(dev);
+ struct mcp_driver *drv = to_mcp_driver(dev->driver);
+
+ drv->remove(mcp);
+ return 0;
+}
+
+static int mcp_bus_suspend(struct device *dev, pm_message_t state)
+{
+ struct mcp *mcp = to_mcp(dev);
+ int ret = 0;
+
+ if (dev->driver) {
+ struct mcp_driver *drv = to_mcp_driver(dev->driver);
+
+ ret = drv->suspend(mcp, state);
+ }
+ return ret;
+}
+
+static int mcp_bus_resume(struct device *dev)
+{
+ struct mcp *mcp = to_mcp(dev);
+ int ret = 0;
+
+ if (dev->driver) {
+ struct mcp_driver *drv = to_mcp_driver(dev->driver);
+
+ ret = drv->resume(mcp);
+ }
+ return ret;
+}
+
+static struct bus_type mcp_bus_type = {
+ .name = "mcp",
+ .match = mcp_bus_match,
+ .suspend = mcp_bus_suspend,
+ .resume = mcp_bus_resume,
+};
+
+/**
+ * mcp_set_telecom_divisor - set the telecom divisor
+ * @mcp: MCP interface structure
+ * @div: SIB clock divisor
+ *
+ * Set the telecom divisor on the MCP interface. The resulting
+ * sample rate is SIBCLOCK/div.
+ */
+void mcp_set_telecom_divisor(struct mcp *mcp, unsigned int div)
+{
+ spin_lock_irq(&mcp->lock);
+ mcp->ops->set_telecom_divisor(mcp, div);
+ spin_unlock_irq(&mcp->lock);
+}
+EXPORT_SYMBOL(mcp_set_telecom_divisor);
+
+/**
+ * mcp_set_audio_divisor - set the audio divisor
+ * @mcp: MCP interface structure
+ * @div: SIB clock divisor
+ *
+ * Set the audio divisor on the MCP interface.
+ */
+void mcp_set_audio_divisor(struct mcp *mcp, unsigned int div)
+{
+ spin_lock_irq(&mcp->lock);
+ mcp->ops->set_audio_divisor(mcp, div);
+ spin_unlock_irq(&mcp->lock);
+}
+EXPORT_SYMBOL(mcp_set_audio_divisor);
+
+/**
+ * mcp_reg_write - write a device register
+ * @mcp: MCP interface structure
+ * @reg: 4-bit register index
+ * @val: 16-bit data value
+ *
+ * Write a device register. The MCP interface must be enabled
+ * to prevent this function hanging.
+ */
+void mcp_reg_write(struct mcp *mcp, unsigned int reg, unsigned int val)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mcp->lock, flags);
+ mcp->ops->reg_write(mcp, reg, val);
+ spin_unlock_irqrestore(&mcp->lock, flags);
+}
+EXPORT_SYMBOL(mcp_reg_write);
+
+/**
+ * mcp_reg_read - read a device register
+ * @mcp: MCP interface structure
+ * @reg: 4-bit register index
+ *
+ * Read a device register and return its value. The MCP interface
+ * must be enabled to prevent this function hanging.
+ */
+unsigned int mcp_reg_read(struct mcp *mcp, unsigned int reg)
+{
+ unsigned long flags;
+ unsigned int val;
+
+ spin_lock_irqsave(&mcp->lock, flags);
+ val = mcp->ops->reg_read(mcp, reg);
+ spin_unlock_irqrestore(&mcp->lock, flags);
+
+ return val;
+}
+EXPORT_SYMBOL(mcp_reg_read);
+
+/**
+ * mcp_enable - enable the MCP interface
+ * @mcp: MCP interface to enable
+ *
+ * Enable the MCP interface. Each call to mcp_enable will need
+ * a corresponding call to mcp_disable to disable the interface.
+ */
+void mcp_enable(struct mcp *mcp)
+{
+ spin_lock_irq(&mcp->lock);
+ if (mcp->use_count++ == 0)
+ mcp->ops->enable(mcp);
+ spin_unlock_irq(&mcp->lock);
+}
+EXPORT_SYMBOL(mcp_enable);
+
+/**
+ * mcp_disable - disable the MCP interface
+ * @mcp: MCP interface to disable
+ *
+ * Disable the MCP interface. The MCP interface will only be
+ * disabled once the number of calls to mcp_enable matches the
+ * number of calls to mcp_disable.
+ */
+void mcp_disable(struct mcp *mcp)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mcp->lock, flags);
+ if (--mcp->use_count == 0)
+ mcp->ops->disable(mcp);
+ spin_unlock_irqrestore(&mcp->lock, flags);
+}
+EXPORT_SYMBOL(mcp_disable);
+
+static void mcp_release(struct device *dev)
+{
+ struct mcp *mcp = container_of(dev, struct mcp, attached_device);
+
+ kfree(mcp);
+}
+
+struct mcp *mcp_host_alloc(struct device *parent, size_t size)
+{
+ struct mcp *mcp;
+
+ mcp = kmalloc(sizeof(struct mcp) + size, GFP_KERNEL);
+ if (mcp) {
+ memset(mcp, 0, sizeof(struct mcp) + size);
+ spin_lock_init(&mcp->lock);
+ mcp->attached_device.parent = parent;
+ mcp->attached_device.bus = &mcp_bus_type;
+ mcp->attached_device.dma_mask = parent->dma_mask;
+ mcp->attached_device.release = mcp_release;
+ }
+ return mcp;
+}
+EXPORT_SYMBOL(mcp_host_alloc);
+
+int mcp_host_register(struct mcp *mcp)
+{
+ strcpy(mcp->attached_device.bus_id, "mcp0");
+ return device_register(&mcp->attached_device);
+}
+EXPORT_SYMBOL(mcp_host_register);
+
+void mcp_host_unregister(struct mcp *mcp)
+{
+ device_unregister(&mcp->attached_device);
+}
+EXPORT_SYMBOL(mcp_host_unregister);
+
+int mcp_driver_register(struct mcp_driver *mcpdrv)
+{
+ mcpdrv->drv.bus = &mcp_bus_type;
+ mcpdrv->drv.probe = mcp_bus_probe;
+ mcpdrv->drv.remove = mcp_bus_remove;
+ return driver_register(&mcpdrv->drv);
+}
+EXPORT_SYMBOL(mcp_driver_register);
+
+void mcp_driver_unregister(struct mcp_driver *mcpdrv)
+{
+ driver_unregister(&mcpdrv->drv);
+}
+EXPORT_SYMBOL(mcp_driver_unregister);
+
+static int __init mcp_init(void)
+{
+ return bus_register(&mcp_bus_type);
+}
+
+static void __exit mcp_exit(void)
+{
+ bus_unregister(&mcp_bus_type);
+}
+
+module_init(mcp_init);
+module_exit(mcp_exit);
+
+MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("Core multimedia communications port driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/mfd/mcp-sa11x0.c b/drivers/mfd/mcp-sa11x0.c
new file mode 100644
index 000000000000..e9806fbbe696
--- /dev/null
+++ b/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/mcp.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_plat_data *data = pdev->dev.platform_data;
+ struct mcp *mcp;
+ int ret;
+
+ if (!data)
+ 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 = data->sclk_rate;
+ 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);
+
+ /*
+ * Initialise device. Note that we initially
+ * set the sampling rate to minimum.
+ */
+ Ser4MCSR = -1;
+ Ser4MCCR1 = data->mccr1;
+ Ser4MCCR0 = data->mccr0 | 0x7f7f;
+
+ /*
+ * 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");
diff --git a/drivers/mfd/mcp.h b/drivers/mfd/mcp.h
new file mode 100644
index 000000000000..c093a93b8808
--- /dev/null
+++ b/drivers/mfd/mcp.h
@@ -0,0 +1,66 @@
+/*
+ * linux/drivers/mfd/mcp.h
+ *
+ * Copyright (C) 2001 Russell King, All Rights Reserved.
+ *
+ * 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.
+ */
+#ifndef MCP_H
+#define MCP_H
+
+struct mcp_ops;
+
+struct mcp {
+ struct module *owner;
+ struct mcp_ops *ops;
+ spinlock_t lock;
+ int use_count;
+ unsigned int sclk_rate;
+ unsigned int rw_timeout;
+ dma_device_t dma_audio_rd;
+ dma_device_t dma_audio_wr;
+ dma_device_t dma_telco_rd;
+ dma_device_t dma_telco_wr;
+ struct device attached_device;
+};
+
+struct mcp_ops {
+ void (*set_telecom_divisor)(struct mcp *, unsigned int);
+ void (*set_audio_divisor)(struct mcp *, unsigned int);
+ void (*reg_write)(struct mcp *, unsigned int, unsigned int);
+ unsigned int (*reg_read)(struct mcp *, unsigned int);
+ void (*enable)(struct mcp *);
+ void (*disable)(struct mcp *);
+};
+
+void mcp_set_telecom_divisor(struct mcp *, unsigned int);
+void mcp_set_audio_divisor(struct mcp *, unsigned int);
+void mcp_reg_write(struct mcp *, unsigned int, unsigned int);
+unsigned int mcp_reg_read(struct mcp *, unsigned int);
+void mcp_enable(struct mcp *);
+void mcp_disable(struct mcp *);
+#define mcp_get_sclk_rate(mcp) ((mcp)->sclk_rate)
+
+struct mcp *mcp_host_alloc(struct device *, size_t);
+int mcp_host_register(struct mcp *);
+void mcp_host_unregister(struct mcp *);
+
+struct mcp_driver {
+ struct device_driver drv;
+ int (*probe)(struct mcp *);
+ void (*remove)(struct mcp *);
+ int (*suspend)(struct mcp *, pm_message_t);
+ int (*resume)(struct mcp *);
+};
+
+int mcp_driver_register(struct mcp_driver *);
+void mcp_driver_unregister(struct mcp_driver *);
+
+#define mcp_get_drvdata(mcp) dev_get_drvdata(&(mcp)->attached_device)
+#define mcp_set_drvdata(mcp,d) dev_set_drvdata(&(mcp)->attached_device, d)
+
+#define mcp_priv(mcp) ((void *)((mcp)+1))
+
+#endif