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-rw-r--r--arch/arm/mach-pxa/ssp.c386
1 files changed, 301 insertions, 85 deletions
diff --git a/arch/arm/mach-pxa/ssp.c b/arch/arm/mach-pxa/ssp.c
index 422afee88169..00af7f2fed66 100644
--- a/arch/arm/mach-pxa/ssp.c
+++ b/arch/arm/mach-pxa/ssp.c
@@ -32,45 +32,27 @@
#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
+#include <asm/arch/regs-ssp.h>
#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;
- unsigned int status = SSSR_P(dev->port);
+ struct ssp_dev *dev = dev_id;
+ struct ssp_device *ssp = dev->ssp;
+ unsigned int status;
- SSSR_P(dev->port) = status; /* clear status bits */
+ status = __raw_readl(ssp->mmio_base + SSSR);
+ __raw_writel(status, ssp->mmio_base + SSSR);
if (status & SSSR_ROR)
printk(KERN_WARNING "SSP(%d): receiver overrun\n", dev->port);
@@ -99,15 +81,16 @@ static irqreturn_t ssp_interrupt(int irq, void *dev_id)
*/
int ssp_write_word(struct ssp_dev *dev, u32 data)
{
+ struct ssp_device *ssp = dev->ssp;
int timeout = TIMEOUT;
- while (!(SSSR_P(dev->port) & SSSR_TNF)) {
+ while (!(__raw_readl(ssp->mmio_base + SSSR) & SSSR_TNF)) {
if (!--timeout)
return -ETIMEDOUT;
cpu_relax();
}
- SSDR_P(dev->port) = data;
+ __raw_writel(data, ssp->mmio_base + SSDR);
return 0;
}
@@ -129,15 +112,16 @@ int ssp_write_word(struct ssp_dev *dev, u32 data)
*/
int ssp_read_word(struct ssp_dev *dev, u32 *data)
{
+ struct ssp_device *ssp = dev->ssp;
int timeout = TIMEOUT;
- while (!(SSSR_P(dev->port) & SSSR_RNE)) {
+ while (!(__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE)) {
if (!--timeout)
return -ETIMEDOUT;
cpu_relax();
}
- *data = SSDR_P(dev->port);
+ *data = __raw_readl(ssp->mmio_base + SSDR);
return 0;
}
@@ -151,17 +135,28 @@ int ssp_read_word(struct ssp_dev *dev, u32 *data)
*/
int ssp_flush(struct ssp_dev *dev)
{
+ struct ssp_device *ssp = dev->ssp;
int timeout = TIMEOUT * 2;
+ /* ensure TX FIFO is empty instead of not full */
+ if (cpu_is_pxa3xx()) {
+ while (__raw_readl(ssp->mmio_base + SSSR) & 0xf00) {
+ if (!--timeout)
+ return -ETIMEDOUT;
+ cpu_relax();
+ }
+ timeout = TIMEOUT * 2;
+ }
+
do {
- while (SSSR_P(dev->port) & SSSR_RNE) {
+ while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE) {
if (!--timeout)
return -ETIMEDOUT;
- (void) SSDR_P(dev->port);
+ (void)__raw_readl(ssp->mmio_base + SSDR);
}
if (!--timeout)
return -ETIMEDOUT;
- } while (SSSR_P(dev->port) & SSSR_BSY);
+ } while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_BSY);
return 0;
}
@@ -173,7 +168,12 @@ int ssp_flush(struct ssp_dev *dev)
*/
void ssp_enable(struct ssp_dev *dev)
{
- SSCR0_P(dev->port) |= SSCR0_SSE;
+ struct ssp_device *ssp = dev->ssp;
+ uint32_t sscr0;
+
+ sscr0 = __raw_readl(ssp->mmio_base + SSCR0);
+ sscr0 |= SSCR0_SSE;
+ __raw_writel(sscr0, ssp->mmio_base + SSCR0);
}
/**
@@ -183,7 +183,12 @@ void ssp_enable(struct ssp_dev *dev)
*/
void ssp_disable(struct ssp_dev *dev)
{
- SSCR0_P(dev->port) &= ~SSCR0_SSE;
+ struct ssp_device *ssp = dev->ssp;
+ uint32_t sscr0;
+
+ sscr0 = __raw_readl(ssp->mmio_base + SSCR0);
+ sscr0 &= ~SSCR0_SSE;
+ __raw_writel(sscr0, ssp->mmio_base + SSCR0);
}
/**
@@ -192,14 +197,16 @@ void ssp_disable(struct ssp_dev *dev)
*
* Save the configured SSP state for suspend.
*/
-void ssp_save_state(struct ssp_dev *dev, struct ssp_state *ssp)
+void ssp_save_state(struct ssp_dev *dev, struct ssp_state *state)
{
- ssp->cr0 = SSCR0_P(dev->port);
- ssp->cr1 = SSCR1_P(dev->port);
- ssp->to = SSTO_P(dev->port);
- ssp->psp = SSPSP_P(dev->port);
+ struct ssp_device *ssp = dev->ssp;
+
+ state->cr0 = __raw_readl(ssp->mmio_base + SSCR0);
+ state->cr1 = __raw_readl(ssp->mmio_base + SSCR1);
+ state->to = __raw_readl(ssp->mmio_base + SSTO);
+ state->psp = __raw_readl(ssp->mmio_base + SSPSP);
- SSCR0_P(dev->port) &= ~SSCR0_SSE;
+ ssp_disable(dev);
}
/**
@@ -208,16 +215,18 @@ void ssp_save_state(struct ssp_dev *dev, struct ssp_state *ssp)
*
* Restore the SSP configuration saved previously by ssp_save_state.
*/
-void ssp_restore_state(struct ssp_dev *dev, struct ssp_state *ssp)
+void ssp_restore_state(struct ssp_dev *dev, struct ssp_state *state)
{
- SSSR_P(dev->port) = SSSR_ROR | SSSR_TUR | SSSR_BCE;
+ struct ssp_device *ssp = dev->ssp;
+ uint32_t sssr = SSSR_ROR | SSSR_TUR | SSSR_BCE;
- SSCR0_P(dev->port) = ssp->cr0 & ~SSCR0_SSE;
- SSCR1_P(dev->port) = ssp->cr1;
- SSTO_P(dev->port) = ssp->to;
- SSPSP_P(dev->port) = ssp->psp;
+ __raw_writel(sssr, ssp->mmio_base + SSSR);
- SSCR0_P(dev->port) = ssp->cr0;
+ __raw_writel(state->cr0 & ~SSCR0_SSE, ssp->mmio_base + SSCR0);
+ __raw_writel(state->cr1, ssp->mmio_base + SSCR1);
+ __raw_writel(state->to, ssp->mmio_base + SSTO);
+ __raw_writel(state->psp, ssp->mmio_base + SSPSP);
+ __raw_writel(state->cr0, ssp->mmio_base + SSCR0);
}
/**
@@ -231,15 +240,17 @@ void ssp_restore_state(struct ssp_dev *dev, struct ssp_state *ssp)
*/
int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 speed)
{
+ struct ssp_device *ssp = dev->ssp;
+
dev->mode = mode;
dev->flags = flags;
dev->psp_flags = psp_flags;
dev->speed = speed;
/* set up port type, speed, port settings */
- SSCR0_P(dev->port) = (dev->speed | dev->mode);
- SSCR1_P(dev->port) = dev->flags;
- SSPSP_P(dev->port) = dev->psp_flags;
+ __raw_writel((dev->speed | dev->mode), ssp->mmio_base + SSCR0);
+ __raw_writel(dev->flags, ssp->mmio_base + SSCR1);
+ __raw_writel(dev->psp_flags, ssp->mmio_base + SSPSP);
return 0;
}
@@ -256,44 +267,32 @@ 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;
}
@@ -304,23 +303,240 @@ out_region:
*/
void ssp_exit(struct ssp_dev *dev)
{
- mutex_lock(&mutex);
- SSCR0_P(dev->port) &= ~SSCR0_SSE;
+ struct ssp_device *ssp = dev->ssp;
+
+ ssp_disable(dev);
+ 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);
+
+ 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->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);
- if (dev->port > PXA_SSP_PORTS || dev->port == 0) {
- printk(KERN_WARNING "SSP: tried to close invalid port\n");
- mutex_unlock(&mutex);
- return;
+ 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;
}
- 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);
+ 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);
}
+arch_initcall(pxa_ssp_init);
+module_exit(pxa_ssp_exit);
+
EXPORT_SYMBOL(ssp_write_word);
EXPORT_SYMBOL(ssp_read_word);
EXPORT_SYMBOL(ssp_flush);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.