[ARM] pxa: define "struct ssp_device" and add ssp_request()/ssp_free()

1. define "struct ssp_device" for SSP information, which is requested
   and released by function ssp_request()/ssp_free()

2. modify the ssp_init() and ssp_exit() to use the interface

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

2 files changed, 273 insertions, 59 deletions

diff --git a/arch/arm/mach-pxa/ssp.c b/arch/arm/mach-pxa/ssp.c
index 422afee88169..be6fee78f439 100644
--- a/arch/arm/mach-pxa/ssp.c
+++ b/arch/arm/mach-pxa/ssp.c
@@ -32,39 +32,18 @@
 #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 <asm/io.h>
 #include <asm/irq.h>
 #include <asm/hardware.h>
 #include <asm/arch/ssp.h>
 #include <asm/arch/pxa-regs.h>
 
-#define PXA_SSP_PORTS   3
-
 #define TIMEOUT 100000
 
-struct ssp_info_ {
-        int irq;
-        u32 clock;
-};
-
-/*
- * SSP port clock and IRQ settings
- */
-static const struct ssp_info_ ssp_info[PXA_SSP_PORTS] = {
-#if defined (CONFIG_PXA27x)
-        {IRQ_SSP,       CKEN_SSP1},
-        {IRQ_SSP2,      CKEN_SSP2},
-        {IRQ_SSP3,      CKEN_SSP3},
-#else
-        {IRQ_SSP,       CKEN_SSP},
-        {IRQ_NSSP,      CKEN_NSSP},
-        {IRQ_ASSP,      CKEN_ASSP},
-#endif
-};
-
-static DEFINE_MUTEX(mutex);
-static int use_count[PXA_SSP_PORTS] = {0, 0, 0};
-
 static irqreturn_t ssp_interrupt(int irq, void *dev_id)
 {
         struct ssp_dev *dev = (struct ssp_dev*) dev_id;
@@ -256,44 +235,32 @@ int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 spee
  */
 int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags)
 {
+        struct ssp_device *ssp;
         int ret;
 
-        if (port > PXA_SSP_PORTS || port == 0)
+        ssp = ssp_request(port, "SSP");
+        if (ssp == NULL)
                 return -ENODEV;
 
-        mutex_lock(&mutex);
-        if (use_count[port - 1]) {
-                mutex_unlock(&mutex);
-                return -EBUSY;
-        }
-        use_count[port - 1]++;
-
-        if (!request_mem_region(__PREG(SSCR0_P(port)), 0x2c, "SSP")) {
-                use_count[port - 1]--;
-                mutex_unlock(&mutex);
-                return -EBUSY;
-        }
+        dev->ssp = ssp;
         dev->port = port;
 
         /* do we need to get irq */
         if (!(init_flags & SSP_NO_IRQ)) {
-                ret = request_irq(ssp_info[port-1].irq, ssp_interrupt,
+                ret = request_irq(ssp->irq, ssp_interrupt,
                                 0, "SSP", dev);
                 if (ret)
                         goto out_region;
-                dev->irq = ssp_info[port-1].irq;
+                dev->irq = ssp->irq;
         } else
                 dev->irq = 0;
 
         /* turn on SSP port clock */
-        pxa_set_cken(ssp_info[port-1].clock, 1);
-        mutex_unlock(&mutex);
+        clk_enable(ssp->clk);
         return 0;
 
 out_region:
-        release_mem_region(__PREG(SSCR0_P(port)), 0x2c);
-        use_count[port - 1]--;
-        mutex_unlock(&mutex);
+        ssp_free(ssp);
         return ret;
 }
 
@@ -304,22 +271,239 @@ out_region:
  */
 void ssp_exit(struct ssp_dev *dev)
 {
-        mutex_lock(&mutex);
+        struct ssp_device *ssp = dev->ssp;
+
         SSCR0_P(dev->port) &= ~SSCR0_SSE;
+        free_irq(dev->irq, dev);
+        clk_disable(ssp->clk);
+        ssp_free(ssp);
+}
+
+static DEFINE_MUTEX(ssp_lock);
+static LIST_HEAD(ssp_list);
+
+struct ssp_device *ssp_request(int port, const char *label)
+{
+        struct ssp_device *ssp = NULL;
+
+        mutex_lock(&ssp_lock);
 
-        if (dev->port > PXA_SSP_PORTS || dev->port == 0) {
-                printk(KERN_WARNING "SSP: tried to close invalid port\n");
-                mutex_unlock(&mutex);
-                return;
+        list_for_each_entry(ssp, &ssp_list, node) {
+                if (ssp->port_id == port && ssp->use_count == 0) {
+                        ssp->use_count++;
+                        ssp->label = label;
+                        break;
+                }
         }
 
-        pxa_set_cken(ssp_info[dev->port-1].clock, 0);
-        if (dev->irq)
-                free_irq(dev->irq, dev);
-        release_mem_region(__PREG(SSCR0_P(dev->port)), 0x2c);
-        use_count[dev->port - 1]--;
-        mutex_unlock(&mutex);
+        mutex_unlock(&ssp_lock);
+
+        if (ssp->port_id != port)
+                return NULL;
+
+        return ssp;
+}
+EXPORT_SYMBOL(ssp_request);
+
+void 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(ssp_free);
+
+static int __devinit ssp_probe(struct platform_device *pdev, int type)
+{
+        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->clk = clk_get(&pdev->dev, "SSPCLK");
+        if (IS_ERR(ssp->clk)) {
+                ret = PTR_ERR(ssp->clk);
+                goto err_free;
+        }
+
+        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, res->end - res->start + 1,
+                        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, res->end - res->start + 1);
+        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;
+        }
+
+        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_io;
+        }
+        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_io;
+        }
+        ssp->drcmr_tx = res->start;
+
+        /* 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 = type;
+
+        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, res->end - res->start + 1);
+err_free_clk:
+        clk_put(ssp->clk);
+err_free:
+        kfree(ssp);
+        return ret;
+}
+
+static int __devexit 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, res->end - res->start + 1);
+
+        clk_put(ssp->clk);
+
+        mutex_lock(&ssp_lock);
+        list_del(&ssp->node);
+        mutex_unlock(&ssp_lock);
+
+        kfree(ssp);
+        return 0;
+}
+
+static int __devinit pxa25x_ssp_probe(struct platform_device *pdev)
+{
+        return ssp_probe(pdev, PXA25x_SSP);
+}
+
+static int __devinit pxa25x_nssp_probe(struct platform_device *pdev)
+{
+        return ssp_probe(pdev, PXA25x_NSSP);
+}
+
+static int __devinit pxa27x_ssp_probe(struct platform_device *pdev)
+{
+        return ssp_probe(pdev, PXA27x_SSP);
+}
+
+static struct platform_driver pxa25x_ssp_driver = {
+        .driver         = {
+                .name   = "pxa25x-ssp",
+        },
+        .probe          = pxa25x_ssp_probe,
+        .remove         = __devexit_p(ssp_remove),
+};
+
+static struct platform_driver pxa25x_nssp_driver = {
+        .driver         = {
+                .name   = "pxa25x-nssp",
+        },
+        .probe          = pxa25x_nssp_probe,
+        .remove         = __devexit_p(ssp_remove),
+};
+
+static struct platform_driver pxa27x_ssp_driver = {
+        .driver         = {
+                .name   = "pxa27x-ssp",
+        },
+        .probe          = pxa27x_ssp_probe,
+        .remove         = __devexit_p(ssp_remove),
+};
+
+static int __init pxa_ssp_init(void)
+{
+        int ret = 0;
+
+        ret = platform_driver_register(&pxa25x_ssp_driver);
+        if (ret) {
+                printk(KERN_ERR "failed to register pxa25x_ssp_driver");
+                return ret;
+        }
+
+        ret = platform_driver_register(&pxa25x_nssp_driver);
+        if (ret) {
+                printk(KERN_ERR "failed to register pxa25x_nssp_driver");
+                return ret;
+        }
+
+        ret = platform_driver_register(&pxa27x_ssp_driver);
+        if (ret) {
+                printk(KERN_ERR "failed to register pxa27x_ssp_driver");
+                return ret;
+        }
+
+        return ret;
+}
+
+static void __exit pxa_ssp_exit(void)
+{
+        platform_driver_unregister(&pxa25x_ssp_driver);
+        platform_driver_unregister(&pxa25x_nssp_driver);
+        platform_driver_unregister(&pxa27x_ssp_driver);
+}
+
+module_init(pxa_ssp_init);
+module_exit(pxa_ssp_exit);
 
 EXPORT_SYMBOL(ssp_write_word);
 EXPORT_SYMBOL(ssp_read_word);
diff --git a/include/asm-arm/arch-pxa/ssp.h b/include/asm-arm/arch-pxa/ssp.h
index ea200551a75f..a012882c9ee6 100644
--- a/include/asm-arm/arch-pxa/ssp.h
+++ b/include/asm-arm/arch-pxa/ssp.h
@@ -13,10 +13,37 @@
  *       PXA255     SSP, NSSP
  *       PXA26x     SSP, NSSP, ASSP
  *       PXA27x     SSP1, SSP2, SSP3
+ *       PXA3xx     SSP1, SSP2, SSP3, SSP4
  */
 
-#ifndef SSP_H
-#define SSP_H
+#ifndef __ASM_ARCH_SSP_H
+#define __ASM_ARCH_SSP_H
+
+#include <linux/list.h>
+
+enum pxa_ssp_type {
+        SSP_UNDEFINED = 0,
+        PXA25x_SSP,  /* pxa 210, 250, 255, 26x */
+        PXA25x_NSSP, /* pxa 255, 26x (including ASSP) */
+        PXA27x_SSP,
+};
+
+struct ssp_device {
+        struct platform_device *pdev;
+        struct list_head        node;
+
+        struct clk      *clk;
+        void __iomem    *mmio_base;
+        unsigned long   phys_base;
+
+        const char      *label;
+        int             port_id;
+        int             type;
+        int             use_count;
+        int             irq;
+        int             drcmr_rx;
+        int             drcmr_tx;
+};
 
 /*
  * SSP initialisation flags
@@ -31,6 +58,7 @@ struct ssp_state {
 };
 
 struct ssp_dev {
+        struct ssp_device *ssp;
         u32 port;
         u32 mode;
         u32 flags;
@@ -50,4 +78,6 @@ int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags);
 int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 speed);
 void ssp_exit(struct ssp_dev *dev);
 
-#endif
+struct ssp_device *ssp_request(int port, const char *label);
+void ssp_free(struct ssp_device *);
+#endif /* __ASM_ARCH_SSP_H */