msm_serial: fix serial on trout

Set the mnd counter based on uartclk. This fixes a problem
on 7x30 where the uartclk is 19.2Mhz rather than the usual
4.8Mhz.

Trout incorrectly reports uartclk to be running at 19.2Mhz
It is actually running at 4.8Mhz.  For trout force mnd
counter values as if uartclk was fed by tcxo/4.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
[dwalker@codeaurora.org: inlined, moved into header, added comments.]
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/serial/msm_serial.c b/drivers/serial/msm_serial.c
index ecdc0facf7ee9928fd4354a0e2a52e5d611b6acb..f8c816e7725de2152f9f80b50a0962c6f88c82e4 100644 (file)
--- 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 689f1fa0e84e2370254bc0570e7a841e98184b23..f6ca9ca79e98f34be24525596f1b38fe5c5f31a3 100644 (file)
--- 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 */