Patchwork [V2] FIX OMAP3:McBSP poll read and write for OMAP3

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Submitter charu@ti.com
Date Oct. 20, 2009, 6:41 a.m.
Message ID <1256020860-1108-1-git-send-email-charu@ti.com>
Download mbox | patch
Permalink /patch/54896/
State Changes Requested, archived
Delegated to: Tony Lindgren
Headers show

Comments

Patch

diff --git a/arch/arm/plat-omap/include/mach/mcbsp.h b/arch/arm/plat-omap/include/mach/mcbsp.h
index 0c5f937..b0f9260 100644
--- a/arch/arm/plat-omap/include/mach/mcbsp.h
+++ b/arch/arm/plat-omap/include/mach/mcbsp.h
@@ -406,6 +406,10 @@  void omap_mcbsp_set_spi_mode(unsigned int id, const struct omap_mcbsp_spi_cfg *
 /* Polled read/write functions */
 int omap_mcbsp_pollread(unsigned int id, u16 * buf);
 int omap_mcbsp_pollwrite(unsigned int id, u16 buf);
+
+int omap3_mcbsp_pollread(unsigned int id, u32 *buf);
+int omap3_mcbsp_pollwrite(unsigned int id, u32 buf);
+
 int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type);
 
 #endif
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index b6b520d..1212d11 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -425,7 +425,7 @@  void omap_mcbsp_stop(unsigned int id)
 }
 EXPORT_SYMBOL(omap_mcbsp_stop);
 
-/* polled mcbsp i/o operations */
+/* polled mcbsp i/o operations for omap1 and omap2420 */
 int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 {
 	struct omap_mcbsp *mcbsp;
@@ -515,6 +515,96 @@  int omap_mcbsp_pollread(unsigned int id, u16 *buf)
 }
 EXPORT_SYMBOL(omap_mcbsp_pollread);
 
+/* polled mcbsp i/o operations for omap3 */
+int omap3_mcbsp_pollwrite(unsigned int id, u32 buf)
+{
+	struct omap_mcbsp *mcbsp;
+	void __iomem *base;
+
+	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);
+	base = mcbsp->io_base;
+
+	OMAP_MCBSP_WRITE(base, DXR, buf);
+	/* if frame sync error - clear the error */
+	if (OMAP_MCBSP_READ(base, SPCR2) & XSYNC_ERR) {
+		/* clear error */
+		OMAP_MCBSP_WRITE(base, SPCR2, OMAP_MCBSP_READ(base, SPCR2)
+					& (~XSYNC_ERR));
+		/* resend */
+		return -EPERM;
+	} else {
+		/* wait for transmit confirmation */
+		int attemps = 0;
+		while (!(OMAP_MCBSP_READ(base, SPCR2) & XRDY)) {
+			if (attemps++ > 1000) {
+				OMAP_MCBSP_WRITE(base, SPCR2,
+					OMAP_MCBSP_READ(base, SPCR2) &
+					(~XRST));
+				udelay(10);
+				OMAP_MCBSP_WRITE(base, SPCR2,
+					OMAP_MCBSP_READ(base, SPCR2) |
+					(XRST));
+				udelay(10);
+				dev_err(mcbsp->dev, "Could not write to"
+					" McBSP%d Register\n", mcbsp->id);
+				return -ENOENT;
+			}
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(omap3_mcbsp_pollwrite);
+
+int omap3_mcbsp_pollread(unsigned int id, u32 *buf)
+{
+	struct omap_mcbsp *mcbsp;
+	void __iomem *base;
+
+	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);
+
+	base = mcbsp->io_base;
+	/* if frame sync error - clear the error */
+	if (OMAP_MCBSP_READ(base, SPCR1) & RSYNC_ERR) {
+		/* clear error */
+		OMAP_MCBSP_WRITE(base, SPCR1, OMAP_MCBSP_READ(base, SPCR1)
+					& (~RSYNC_ERR));
+		/* resend */
+		return -EPERM;
+	} else {
+		/* wait for recieve confirmation */
+		int attemps = 0;
+		while (!(OMAP_MCBSP_READ(base, SPCR1) & RRDY)) {
+			if (attemps++ > 1000) {
+				OMAP_MCBSP_WRITE(base, SPCR1,
+					OMAP_MCBSP_READ(base, SPCR1) &
+					(~RRST));
+				udelay(10);
+				OMAP_MCBSP_WRITE(base, SPCR1,
+					OMAP_MCBSP_READ(base, SPCR1) |
+					(RRST));
+				udelay(10);
+				dev_err(mcbsp->dev, "Could not read from"
+					" McBSP%d Register\n", mcbsp->id);
+				return -ENOENT;
+			}
+		}
+	}
+	*buf = OMAP_MCBSP_READ(base, DRR);
+
+	return 0;
+}
+EXPORT_SYMBOL(omap3_mcbsp_pollread);
+
 /*
  * IRQ based word transmission.
  */