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omap2/3/4: serial: introduce errata handling

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introduce silicon specific quirks as a errata handling mechanism

as a start UART_ERRATA_FIFO_FULL_ABORT is used to handle the override
for fifo full condition for rx and tx.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Nishanth Menon 2010-08-02 13:18:12 +03:00 committed by Tony Lindgren
parent bfe6977ac7
commit 5a927b36f5
1 changed files with 10 additions and 5 deletions
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15
arch/arm/mach-omap2/serial.c
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@ -37,6 +37,8 @@
#define UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV 0x52
#define UART_OMAP_WER 0x17 /* Wake-up enable register */
#define UART_ERRATA_FIFO_FULL_ABORT (0x1 << 0)
/*
* NOTE: By default the serial timeout is disabled as it causes lost characters
* over the serial ports. This means that the UART clocks will stay on until
@ -64,6 +66,7 @@ struct omap_uart_state {
struct list_head node;
struct platform_device pdev;
u32 errata;
#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
int context_valid;
@ -756,11 +759,13 @@ void __init omap_serial_init_port(int port)
* omap3xxx: Never read empty UART fifo on UARTs
* with IP rev >=0x52
*/
if (cpu_is_omap44xx()) {
uart->p->serial_in = serial_in_override;
uart->p->serial_out = serial_out_override;
} else if ((serial_read_reg(uart->p, UART_OMAP_MVER) & 0xFF)
>= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV) {
if (cpu_is_omap44xx())
uart->errata |= UART_ERRATA_FIFO_FULL_ABORT;
else if ((serial_read_reg(uart->p, UART_OMAP_MVER) & 0xFF)
>= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV)
uart->errata |= UART_ERRATA_FIFO_FULL_ABORT;
if (uart->errata & UART_ERRATA_FIFO_FULL_ABORT) {
uart->p->serial_in = serial_in_override;
uart->p->serial_out = serial_out_override;
}