[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>

1 files changed, 275 insertions, 0 deletions

diff --git a/drivers/mfd/mcp-sa11x0.c b/drivers/mfd/mcp-sa11x0.c
new file mode 100644
index 000000000000..25699fa37fef
--- /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/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");