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authorEduardo Valentin <eduardo.valentin@nokia.com>2009-08-20 16:18:11 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-08-20 20:10:26 +0100
commita1a56f5faa41327116bf960a8e79f21a8ea35dce (patch)
treeca6e8fba492f5a3caddf421d0c4f573d863bef99
parent7aa9ff56cae7a6a4fa2e1a503cc5f8bbd887d6e3 (diff)
downloadlinux-linaro-precise-a1a56f5faa41327116bf960a8e79f21a8ea35dce.tar.gz
OMAP: McBSP: Create and export max_(r|t)x_thres property
This patch export through sysfs two properties to configure maximum threshold for transmission and reception on each mcbsp instance. Also, it exports two helper functions to allow mcbsp users to read this values. Signed-off-by: Eduardo Valentin <eduardo.valentin@nokia.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
-rw-r--r--arch/arm/mach-omap2/mcbsp.c5
-rw-r--r--arch/arm/plat-omap/include/mach/mcbsp.h11
-rw-r--r--arch/arm/plat-omap/mcbsp.c122
3 files changed, 138 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/mcbsp.c b/arch/arm/mach-omap2/mcbsp.c
index a5c0f0435cd..f837114d1d6 100644
--- a/arch/arm/mach-omap2/mcbsp.c
+++ b/arch/arm/mach-omap2/mcbsp.c
@@ -129,6 +129,7 @@ static struct omap_mcbsp_platform_data omap34xx_mcbsp_pdata[] = {
.rx_irq = INT_24XX_MCBSP1_IRQ_RX,
.tx_irq = INT_24XX_MCBSP1_IRQ_TX,
.ops = &omap2_mcbsp_ops,
+ .buffer_size = 0x7F,
},
{
.phys_base = OMAP34XX_MCBSP2_BASE,
@@ -137,6 +138,7 @@ static struct omap_mcbsp_platform_data omap34xx_mcbsp_pdata[] = {
.rx_irq = INT_24XX_MCBSP2_IRQ_RX,
.tx_irq = INT_24XX_MCBSP2_IRQ_TX,
.ops = &omap2_mcbsp_ops,
+ .buffer_size = 0x3FF,
},
{
.phys_base = OMAP34XX_MCBSP3_BASE,
@@ -145,6 +147,7 @@ static struct omap_mcbsp_platform_data omap34xx_mcbsp_pdata[] = {
.rx_irq = INT_24XX_MCBSP3_IRQ_RX,
.tx_irq = INT_24XX_MCBSP3_IRQ_TX,
.ops = &omap2_mcbsp_ops,
+ .buffer_size = 0x7F,
},
{
.phys_base = OMAP34XX_MCBSP4_BASE,
@@ -153,6 +156,7 @@ static struct omap_mcbsp_platform_data omap34xx_mcbsp_pdata[] = {
.rx_irq = INT_24XX_MCBSP4_IRQ_RX,
.tx_irq = INT_24XX_MCBSP4_IRQ_TX,
.ops = &omap2_mcbsp_ops,
+ .buffer_size = 0x7F,
},
{
.phys_base = OMAP34XX_MCBSP5_BASE,
@@ -161,6 +165,7 @@ static struct omap_mcbsp_platform_data omap34xx_mcbsp_pdata[] = {
.rx_irq = INT_24XX_MCBSP5_IRQ_RX,
.tx_irq = INT_24XX_MCBSP5_IRQ_TX,
.ops = &omap2_mcbsp_ops,
+ .buffer_size = 0x7F,
},
};
#define OMAP34XX_MCBSP_PDATA_SZ ARRAY_SIZE(omap34xx_mcbsp_pdata)
diff --git a/arch/arm/plat-omap/include/mach/mcbsp.h b/arch/arm/plat-omap/include/mach/mcbsp.h
index 2544aa5bccd..832330d7cb3 100644
--- a/arch/arm/plat-omap/include/mach/mcbsp.h
+++ b/arch/arm/plat-omap/include/mach/mcbsp.h
@@ -348,6 +348,9 @@ struct omap_mcbsp_platform_data {
u8 dma_rx_sync, dma_tx_sync;
u16 rx_irq, tx_irq;
struct omap_mcbsp_ops *ops;
+#ifdef CONFIG_ARCH_OMAP34XX
+ u16 buffer_size;
+#endif
};
struct omap_mcbsp {
@@ -381,6 +384,10 @@ struct omap_mcbsp {
struct omap_mcbsp_platform_data *pdata;
struct clk *iclk;
struct clk *fclk;
+#ifdef CONFIG_ARCH_OMAP34XX
+ u16 max_tx_thres;
+ u16 max_rx_thres;
+#endif
};
extern struct omap_mcbsp **mcbsp_ptr;
extern int omap_mcbsp_count;
@@ -392,11 +399,15 @@ void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg * config
#ifdef CONFIG_ARCH_OMAP34XX
void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold);
void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold);
+u16 omap_mcbsp_get_max_tx_threshold(unsigned int id);
+u16 omap_mcbsp_get_max_rx_threshold(unsigned int id);
#else
static inline void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold)
{ }
static inline void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
{ }
+static inline u16 omap_mcbsp_get_max_tx_threshold(unsigned int id) { return 0; }
+static inline u16 omap_mcbsp_get_max_rx_threshold(unsigned int id) { return 0; }
#endif
int omap_mcbsp_request(unsigned int id);
void omap_mcbsp_free(unsigned int id);
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 081f2eace92..0bbc912e548 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -246,6 +246,42 @@ void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
OMAP_MCBSP_WRITE(io_base, THRSH1, threshold);
}
EXPORT_SYMBOL(omap_mcbsp_set_rx_threshold);
+
+/*
+ * omap_mcbsp_get_max_tx_thres just return the current configured
+ * maximum threshold for transmission
+ */
+u16 omap_mcbsp_get_max_tx_threshold(unsigned int id)
+{
+ struct omap_mcbsp *mcbsp;
+
+ if (!omap_mcbsp_check_valid_id(id)) {
+ printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+ return -ENODEV;
+ }
+ mcbsp = id_to_mcbsp_ptr(id);
+
+ return mcbsp->max_tx_thres;
+}
+EXPORT_SYMBOL(omap_mcbsp_get_max_tx_threshold);
+
+/*
+ * omap_mcbsp_get_max_rx_thres just return the current configured
+ * maximum threshold for reception
+ */
+u16 omap_mcbsp_get_max_rx_threshold(unsigned int id)
+{
+ struct omap_mcbsp *mcbsp;
+
+ if (!omap_mcbsp_check_valid_id(id)) {
+ printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+ return -ENODEV;
+ }
+ mcbsp = id_to_mcbsp_ptr(id);
+
+ return mcbsp->max_rx_thres;
+}
+EXPORT_SYMBOL(omap_mcbsp_get_max_rx_threshold);
#endif
/*
@@ -1005,6 +1041,86 @@ void omap_mcbsp_set_spi_mode(unsigned int id,
}
EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);
+#ifdef CONFIG_ARCH_OMAP34XX
+#define max_thres(m) (mcbsp->pdata->buffer_size)
+#define valid_threshold(m, val) ((val) <= max_thres(m))
+#define THRESHOLD_PROP_BUILDER(prop) \
+static ssize_t prop##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); \
+ \
+ return sprintf(buf, "%u\n", mcbsp->prop); \
+} \
+ \
+static ssize_t prop##_store(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t size) \
+{ \
+ struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); \
+ unsigned long val; \
+ int status; \
+ \
+ status = strict_strtoul(buf, 0, &val); \
+ if (status) \
+ return status; \
+ \
+ if (!valid_threshold(mcbsp, val)) \
+ return -EDOM; \
+ \
+ mcbsp->prop = val; \
+ return size; \
+} \
+ \
+static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store);
+
+THRESHOLD_PROP_BUILDER(max_tx_thres);
+THRESHOLD_PROP_BUILDER(max_rx_thres);
+
+static const struct attribute *threshold_attrs[] = {
+ &dev_attr_max_tx_thres.attr,
+ &dev_attr_max_rx_thres.attr,
+ NULL,
+};
+
+static const struct attribute_group threshold_attr_group = {
+ .attrs = (struct attribute **)threshold_attrs,
+};
+
+static inline int __devinit omap_thres_add(struct device *dev)
+{
+ return sysfs_create_group(&dev->kobj, &threshold_attr_group);
+}
+
+static inline void __devexit omap_thres_remove(struct device *dev)
+{
+ sysfs_remove_group(&dev->kobj, &threshold_attr_group);
+}
+
+static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
+{
+ if (cpu_is_omap34xx()) {
+ mcbsp->max_tx_thres = max_thres(mcbsp);
+ mcbsp->max_rx_thres = max_thres(mcbsp);
+ if (omap_thres_add(mcbsp->dev))
+ dev_warn(mcbsp->dev,
+ "Unable to create threshold controls\n");
+ } else {
+ mcbsp->max_tx_thres = -EINVAL;
+ mcbsp->max_rx_thres = -EINVAL;
+ }
+}
+
+static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp)
+{
+ if (cpu_is_omap34xx())
+ omap_thres_remove(mcbsp->dev);
+}
+#else
+static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp) {}
+static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp) {}
+#endif /* CONFIG_ARCH_OMAP34XX */
+
/*
* McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
* 730 has only 2 McBSP, and both of them are MPU peripherals.
@@ -1075,6 +1191,10 @@ static int __devinit omap_mcbsp_probe(struct platform_device *pdev)
mcbsp->dev = &pdev->dev;
mcbsp_ptr[id] = mcbsp;
platform_set_drvdata(pdev, mcbsp);
+
+ /* Initialize mcbsp properties for OMAP34XX if needed / applicable */
+ omap34xx_device_init(mcbsp);
+
return 0;
err_fclk:
@@ -1098,6 +1218,8 @@ static int __devexit omap_mcbsp_remove(struct platform_device *pdev)
mcbsp->pdata->ops->free)
mcbsp->pdata->ops->free(mcbsp->id);
+ omap34xx_device_exit(mcbsp);
+
clk_disable(mcbsp->fclk);
clk_disable(mcbsp->iclk);
clk_put(mcbsp->fclk);