linux-kernel - [PATCH] msm_serial: fix serial on trout

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Message-Id: <1274286935-8474-1-git-send-email-adharmap@codeaurora.org>
Date:	Wed, 19 May 2010 09:35:35 -0700
From:	Abhijeet Dharmapurikar <adharmap@...eaurora.org>
To:	Daniel Walker <dwalker@...eaurora.org>
Cc:	Abhijeet Dharmapurikar <adharmap@...eaurora.org>,
	David Brown <davidb@...eaurora.org>,
	Daniel Walker <dwalker@...eaurora.org>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Brian Swetland <swetland@...gle.com>,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] msm_serial: fix serial on trout

All targets report the correct uartclk except trout.
For trout force mnd counter values as if uartclk was
fed by tcxo/4. For other targets set the mnd counter
based on uartclk.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@...eaurora.org>
---
 drivers/serial/msm_serial.c |   33 ++++++++++++++++++++++++++++-----
 drivers/serial/msm_serial.h |    6 ++++++
 2 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/drivers/serial/msm_serial.c b/drivers/serial/msm_serial.c
index ecdc0fa..7021c8c 100644
--- a/drivers/serial/msm_serial.c
+++ b/drivers/serial/msm_serial.c
@@ -315,16 +315,37 @@ static void msm_reset(struct uart_port *port)
 	msm_write(port, UART_CR_CMD_SET_RFR, UART_CR);
 }
 
+
+static void msm_serial_set_mnd_regs_tcxo(struct uart_port *port)
+{
+	msm_write(port, 0x06, UART_MREG);
+	msm_write(port, 0xF1, UART_NREG);
+	msm_write(port, 0x0F, UART_DREG);
+	msm_write(port, 0x1A, UART_MNDREG);
+}
+
+static void msm_serial_set_mnd_regs_tcxoby4(struct uart_port *port)
+{
+	msm_write(port, 0x18, UART_MREG);
+	msm_write(port, 0xF6, UART_NREG);
+	msm_write(port, 0x0F, UART_DREG);
+	msm_write(port, 0x0A, UART_MNDREG);
+}
+
+static void msm_serial_set_mnd_regs_from_uartclk(struct uart_port *port)
+{
+	if (port->uartclk == 19200000)
+		msm_serial_set_mnd_regs_tcxo(port);
+	else
+		msm_serial_set_mnd_regs_tcxoby4(port);
+}
+
 static void msm_init_clock(struct uart_port *port)
 {
 	struct msm_port *msm_port = UART_TO_MSM(port);
 
 	clk_enable(msm_port->clk);
-
-	msm_write(port, 0xC0, UART_MREG);
-	msm_write(port, 0xB2, UART_NREG);
-	msm_write(port, 0x7D, UART_DREG);
-	msm_write(port, 0x1C, UART_MNDREG);
+	msm_serial_set_mnd_regs(port);
 }
 
 static int msm_startup(struct uart_port *port)
@@ -706,6 +727,8 @@ static int __init msm_serial_probe(struct platform_device *pdev)
 	if (unlikely(IS_ERR(msm_port->clk)))
 		return PTR_ERR(msm_port->clk);
 	port->uartclk = clk_get_rate(msm_port->clk);
+	printk(KERN_INFO "uartclk = %d\n", port->uartclk);
+
 
 	resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (unlikely(!resource))
diff --git a/drivers/serial/msm_serial.h b/drivers/serial/msm_serial.h
index 689f1fa..4767211 100644
--- a/drivers/serial/msm_serial.h
+++ b/drivers/serial/msm_serial.h
@@ -114,4 +114,10 @@
 #define UART_MISR	0x0010
 #define UART_ISR	0x0014
 
+#ifdef CONFIG_MACH_TROUT
+#define msm_serial_set_mnd_regs msm_serial_set_mnd_regs_tcxoby4
+#else
+#define msm_serial_set_mnd_regs msm_serial_set_mnd_regs_from_uartclk
+#endif
+
 #endif	/* __DRIVERS_SERIAL_MSM_SERIAL_H */
-- 
1.5.6.3

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