UART is disabled by default on TI platforms and must be enabled via the MDR register.
Add a new flag in the jailhouse_console and apply the quirk as part of uart_init for 8250 driver when this flag is present. Signed-off-by: Nikhil Devshatwar <[email protected]> Signed-off-by: Lokesh Vutla <[email protected]> --- Changes from v1: * Use console flag for MDR quirk instead of compile time flag include/jailhouse/console.h | 7 ++++++- inmates/lib/uart-8250.c | 4 ++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/include/jailhouse/console.h b/include/jailhouse/console.h index 8961c6e..a54bb56 100644 --- a/include/jailhouse/console.h +++ b/include/jailhouse/console.h @@ -78,7 +78,12 @@ #define CON_HAS_INVERTED_GATE(flags) !!((flags) & JAILHOUSE_CON_INVERTED_GATE) -/* Bits 13-15: Reserved */ +/* Bit 13 is used to apply(set) or skip(clear) a MDR quirk on the console */ +#define JAILHOUSE_CON_MDR_QUIRK 0x2000 + +#define CON_HAS_MDR_QUIRK(flags) !!((flags) & JAILHOUSE_CON_MDR_QUIRK) + +/* Bits 14-15: Reserved */ struct jailhouse_console { __u64 address; diff --git a/inmates/lib/uart-8250.c b/inmates/lib/uart-8250.c index fb7940d..5b94b5d 100644 --- a/inmates/lib/uart-8250.c +++ b/inmates/lib/uart-8250.c @@ -49,6 +49,7 @@ #define UART_LCR_DLAB 0x80 #define UART_LSR 0x5 #define UART_LSR_THRE 0x20 +#define UART_MDR1 0x8 static void reg_out_mmio32(struct uart_chip *chip, unsigned int reg, u32 value) { @@ -67,6 +68,9 @@ static void uart_8250_init(struct uart_chip *chip) chip->reg_out(chip, UART_DLL, chip->divider); chip->reg_out(chip, UART_DLM, 0); chip->reg_out(chip, UART_LCR, UART_LCR_8N1); + if (comm_region->console.flags & JAILHOUSE_CON_MDR_QUIRK) { + chip->reg_out(chip, UART_MDR1, 0); + } } } -- 2.7.4 -- You received this message because you are subscribed to the Google Groups "Jailhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/jailhouse-dev/1566224813-20129-2-git-send-email-nikhil.nd%40ti.com.
