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omap: Serial: Define register access modes in LCR

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Access to some registers depends on register access mode
Three different modes are available for OMAP (at least)
• Operational mode     LCR_REG[7] = 0x0
• Configuration mode A LCR_REG[7] = 0x1 and LCR_REG[7:0]! = 0xBF
• Configuration mode B LCR_REG[7] = 0x1 and LCR_REG[7:0]  = 0xBF

Define access modes and remove redefinitions and magic numbers
in serial drivers (and later in bluetooth driver).

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@nokia.com>
Acked-by: Govindraj.R <govindraj.raja@ti.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Andrei Emeltchenko
2010-11-30 14:11:49 -08:00
committed by Tony Lindgren
parent 498cb95175
commit 662b083a87
5 changed files with 43 additions and 45 deletions
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7
include/linux/serial_reg.h
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@@ -99,6 +99,13 @@
#define UART_LCR_WLEN7 0x02 /* Wordlength: 7 bits */
#define UART_LCR_WLEN8 0x03 /* Wordlength: 8 bits */
/*
* Access to some registers depends on register access / configuration
* mode.
*/
#define UART_LCR_CONF_MODE_A UART_LCR_DLAB /* Configutation mode A */
#define UART_LCR_CONF_MODE_B 0xBF /* Configutation mode B */
#define UART_MCR 4 /* Out: Modem Control Register */
#define UART_MCR_CLKSEL 0x80 /* Divide clock by 4 (TI16C752, EFR[4]=1) */
#define UART_MCR_TCRTLR 0x40 /* Access TCR/TLR (TI16C752, EFR[4]=1) */