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-rw-r--r--arch/arm/mach-pxa/ssp.c296
-rw-r--r--include/asm-arm/arch-pxa/ssp.h36
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 */
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-17 03:29:48 +0300