1 files changed, 224 insertions, 0 deletions

diff --git a/arch/arm/plat-pxa/ssp.c b/arch/arm/plat-pxa/ssp.c
new file mode 100644
index 000000000000..c6357e554aba
--- /dev/null
+++ b/arch/arm/plat-pxa/ssp.c
@@ -0,0 +1,224 @@
+/*
+ *  linux/arch/arm/mach-pxa/ssp.c
+ *
+ *  based on linux/arch/arm/mach-sa1100/ssp.c by Russell King
+ *
+ *  Copyright (C) 2003 Russell King.
+ *  Copyright (C) 2003 Wolfson Microelectronics PLC
+ *
+ * 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.
+ *
+ *  PXA2xx SSP driver.  This provides the generic core for simple
+ *  IO-based SSP applications and allows easy port setup for DMA access.
+ *
+ *  Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+#include <plat/ssp.h>
+
+static DEFINE_MUTEX(ssp_lock);
+static LIST_HEAD(ssp_list);
+
+struct ssp_device *pxa_ssp_request(int port, const char *label)
+{
+        struct ssp_device *ssp = NULL;
+
+        mutex_lock(&ssp_lock);
+
+        list_for_each_entry(ssp, &ssp_list, node) {
+                if (ssp->port_id == port && ssp->use_count == 0) {
+                        ssp->use_count++;
+                        ssp->label = label;
+                        break;
+                }
+        }
+
+        mutex_unlock(&ssp_lock);
+
+        if (&ssp->node == &ssp_list)
+                return NULL;
+
+        return ssp;
+}
+EXPORT_SYMBOL(pxa_ssp_request);
+
+void pxa_ssp_free(struct ssp_device *ssp)
+{
+        mutex_lock(&ssp_lock);
+        if (ssp->use_count) {
+                ssp->use_count--;
+                ssp->label = NULL;
+        } else
+                dev_err(&ssp->pdev->dev, "device already free\n");
+        mutex_unlock(&ssp_lock);
+}
+EXPORT_SYMBOL(pxa_ssp_free);
+
+static int __devinit pxa_ssp_probe(struct platform_device *pdev)
+{
+        const struct platform_device_id *id = platform_get_device_id(pdev);
+        struct resource *res;
+        struct ssp_device *ssp;
+        int ret = 0;
+
+        ssp = kzalloc(sizeof(struct ssp_device), GFP_KERNEL);
+        if (ssp == NULL) {
+                dev_err(&pdev->dev, "failed to allocate memory");
+                return -ENOMEM;
+        }
+        ssp->pdev = pdev;
+
+        ssp->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(ssp->clk)) {
+                ret = PTR_ERR(ssp->clk);
+                goto err_free;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+        if (res == NULL) {
+                dev_err(&pdev->dev, "no SSP RX DRCMR defined\n");
+                ret = -ENODEV;
+                goto err_free_clk;
+        }
+        ssp->drcmr_rx = res->start;
+
+        res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+        if (res == NULL) {
+                dev_err(&pdev->dev, "no SSP TX DRCMR defined\n");
+                ret = -ENODEV;
+                goto err_free_clk;
+        }
+        ssp->drcmr_tx = res->start;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (res == NULL) {
+                dev_err(&pdev->dev, "no memory resource defined\n");
+                ret = -ENODEV;
+                goto err_free_clk;
+        }
+
+        res = request_mem_region(res->start, resource_size(res),
+                        pdev->name);
+        if (res == NULL) {
+                dev_err(&pdev->dev, "failed to request memory resource\n");
+                ret = -EBUSY;
+                goto err_free_clk;
+        }
+
+        ssp->phys_base = res->start;
+
+        ssp->mmio_base = ioremap(res->start, resource_size(res));
+        if (ssp->mmio_base == NULL) {
+                dev_err(&pdev->dev, "failed to ioremap() registers\n");
+                ret = -ENODEV;
+                goto err_free_mem;
+        }
+
+        ssp->irq = platform_get_irq(pdev, 0);
+        if (ssp->irq < 0) {
+                dev_err(&pdev->dev, "no IRQ resource defined\n");
+                ret = -ENODEV;
+                goto err_free_io;
+        }
+
+        /* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id
+         * starts from 0, do a translation here
+         */
+        ssp->port_id = pdev->id + 1;
+        ssp->use_count = 0;
+        ssp->type = (int)id->driver_data;
+
+        mutex_lock(&ssp_lock);
+        list_add(&ssp->node, &ssp_list);
+        mutex_unlock(&ssp_lock);
+
+        platform_set_drvdata(pdev, ssp);
+        return 0;
+
+err_free_io:
+        iounmap(ssp->mmio_base);
+err_free_mem:
+        release_mem_region(res->start, resource_size(res));
+err_free_clk:
+        clk_put(ssp->clk);
+err_free:
+        kfree(ssp);
+        return ret;
+}
+
+static int __devexit pxa_ssp_remove(struct platform_device *pdev)
+{
+        struct resource *res;
+        struct ssp_device *ssp;
+
+        ssp = platform_get_drvdata(pdev);
+        if (ssp == NULL)
+                return -ENODEV;
+
+        iounmap(ssp->mmio_base);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        release_mem_region(res->start, resource_size(res));
+
+        clk_put(ssp->clk);
+
+        mutex_lock(&ssp_lock);
+        list_del(&ssp->node);
+        mutex_unlock(&ssp_lock);
+
+        kfree(ssp);
+        return 0;
+}
+
+static const struct platform_device_id ssp_id_table[] = {
+        { "pxa25x-ssp",         PXA25x_SSP },
+        { "pxa25x-nssp",        PXA25x_NSSP },
+        { "pxa27x-ssp",         PXA27x_SSP },
+        { "pxa168-ssp",         PXA168_SSP },
+        { },
+};
+
+static struct platform_driver pxa_ssp_driver = {
+        .probe          = pxa_ssp_probe,
+        .remove         = __devexit_p(pxa_ssp_remove),
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = "pxa2xx-ssp",
+        },
+        .id_table       = ssp_id_table,
+};
+
+static int __init pxa_ssp_init(void)
+{
+        return platform_driver_register(&pxa_ssp_driver);
+}
+
+static void __exit pxa_ssp_exit(void)
+{
+        platform_driver_unregister(&pxa_ssp_driver);
+}
+
+arch_initcall(pxa_ssp_init);
+module_exit(pxa_ssp_exit);
+
+MODULE_DESCRIPTION("PXA SSP driver");
+MODULE_AUTHOR("Liam Girdwood");
+MODULE_LICENSE("GPL");