linux-kernel - [GIT PULL] MSM serial driver update for 2.6.35

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Date:	Thu, 27 May 2010 15:03:39 -0700
From:	Daniel Walker <dwalker@...eaurora.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [GIT PULL] MSM serial driver update for 2.6.35

Hi Linus,

	Just one fix for our serial driver to get it working with MSM7x30,
which was added this merge window.

Daniel


The following changes since commit be1066bbcd443a65df312fdecea7e4959adedb45:

  Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6 (2010-04-30 10:16:55 -0700)

are available in the git repository at:

  git://codeaurora.org/quic/kernel/dwalker/linux-msm.git msm-serial

Abhijeet Dharmapurikar (1):
      msm: serial: fix serial on MSM7x30

 drivers/serial/msm_serial.c |   21 ++-------------
 drivers/serial/msm_serial.h |   56 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 18 deletions(-)

diff --git a/drivers/serial/msm_serial.c b/drivers/serial/msm_serial.c
index ecdc0fa..f8c816e 100644
--- a/drivers/serial/msm_serial.c
+++ b/drivers/serial/msm_serial.c
@@ -41,19 +41,6 @@ struct msm_port {
 	unsigned int		imr;
 };
 
-#define UART_TO_MSM(uart_port)	((struct msm_port *) uart_port)
-
-static inline void msm_write(struct uart_port *port, unsigned int val,
-			     unsigned int off)
-{
-	__raw_writel(val, port->membase + off);
-}
-
-static inline unsigned int msm_read(struct uart_port *port, unsigned int off)
-{
-	return __raw_readl(port->membase + off);
-}
-
 static void msm_stop_tx(struct uart_port *port)
 {
 	struct msm_port *msm_port = UART_TO_MSM(port);
@@ -320,11 +307,7 @@ 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 +689,8 @@ 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..f6ca9ca 100644
--- a/drivers/serial/msm_serial.h
+++ b/drivers/serial/msm_serial.h
@@ -114,4 +114,60 @@
 #define UART_MISR	0x0010
 #define UART_ISR	0x0014
 
+#define UART_TO_MSM(uart_port)	((struct msm_port *) uart_port)
+
+static inline
+void msm_write(struct uart_port *port, unsigned int val, unsigned int off)
+{
+	__raw_writel(val, port->membase + off);
+}
+
+static inline
+unsigned int msm_read(struct uart_port *port, unsigned int off)
+{
+	return __raw_readl(port->membase + off);
+}
+
+/*
+ * Setup the MND registers to use the TCXO clock.
+ */
+static inline 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);
+}
+
+/*
+ * Setup the MND registers to use the TCXO clock divided by 4.
+ */
+static inline 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 inline
+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);
+}
+
+/*
+ * TROUT has a specific defect that makes it report it's uartclk
+ * as 19.2Mhz (TCXO) when it's actually 4.8Mhz (TCXO/4). This special
+ * cases TROUT to use the right clock.
+ */
+#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 */


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