Using UART1 on TI-LCDK under Linux

I was able to produce output on UART1 TX. I changed the bootloader to initialize UART1 (but not set it as console). See changes listed below. I also had to enable LPSC PSC1 12 when generating the AIS bootloader image. Perhaps not all of the changes were required (e.g. pinmuxing is also done in the kernel board init).

It seems most of these changes should live in the kernel board initialization or serial driver. Does anyone have insight on where the best place for these changes to be made? 

1) include/asm/arch/hardware.h

/* Emulation suspend bits */

#define DAVINCI_SYSCFG_SUSPSRC_EMAC             (1 << 5)

#define DAVINCI_SYSCFG_SUSPSRC_I2C              (1 << 16)

#define DAVINCI_SYSCFG_SUSPSRC_SPI0             (1 << 21)

#define DAVINCI_SYSCFG_SUSPSRC_SPI1             (1 << 22)

#define DAVINCI_SYSCFG_SUSPSRC_UART0            (1 << 18)

#define DAVINCI_SYSCFG_SUSPSRC_UART1            (1 << 19) // MWS added for UART1

#define DAVINCI_SYSCFG_SUSPSRC_UART2            (1 << 20)

#define DAVINCI_SYSCFG_SUSPSRC_TIMER0           (1 << 27)

2) include/configs/omapl138_lcdk.h

/*

* Serial Driver info

*/

#define CONFIG_SYS_NS16550

#define CONFIG_SYS_NS16550_SERIAL

#define CONFIG_SYS_NS16550_REG_SIZE     -4      /* NS16550 register size */

#define CONFIG_SYS_NS16550_COM1 DAVINCI_UART2_BASE /* Base address of UART2 */

#define CONFIG_SYS_NS16550_COM2 DAVINCI_UART1_BASE /* MWS Base address of UART1 */

#define CONFIG_SYS_NS16550_CLK  clk_get(DAVINCI_UART2_CLKID)

#define CONFIG_CONS_INDEX       1               /* use UART0 for console */

#define CONFIG_BAUDRATE         115200          /* Default baud rate */

#define CONFIG_SYS_BAUDRATE_TABLE       { 9600, 19200, 38400, 57600, 115200 }

3) board/davinci/da8xxevm/omapl138_lcdk.c

/* UART pin muxer settings */

static const struct pinmux_config uart_pins[] = {

       { pinmux(4), 2, 6 }, // MWS UART1_RXD

       { pinmux(4), 2, 7 }, // MWS UART1_TXD

       { pinmux(0), 4, 6 },

       { pinmux(0), 4, 7 },

       { pinmux(4), 2, 4 },

       { pinmux(4), 2, 5 }

};

      /* setup the SUSPSRC for ARM to control emulation suspend */

       /* MWS added UART1 */

       writel(readl(&davinci_syscfg_regs->suspsrc) &

              ~(DAVINCI_SYSCFG_SUSPSRC_EMAC | DAVINCI_SYSCFG_SUSPSRC_I2C |

                DAVINCI_SYSCFG_SUSPSRC_SPI1 | DAVINCI_SYSCFG_SUSPSRC_TIMER0 |

                DAVINCI_SYSCFG_SUSPSRC_UART2 | DAVINCI_SYSCFG_SUSPSRC_UART1),

              &davinci_syscfg_regs->suspsrc);

       /* MWS added for UART1 enable the console UART */

       writel((DAVINCI_UART_PWREMU_MGMT_FREE | DAVINCI_UART_PWREMU_MGMT_URRST                

| DAVINCI_UART_PWREMU_MGMT_UTRST), &davinci_uart1_ctrl_regs->pwremu_mgmt);