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| author | Nishanth Menon | 2010-08-02 12:18:12 +0200 |
|---|---|---|
| committer | Tony Lindgren | 2010-08-02 12:18:12 +0200 |
| commit | 5a927b36f56c2a937e67f0947f233f723660f690 (patch) | |
| tree | 5dba76203c4da869632c511b7175187497ff2242 /arch/arm/mach-omap2/serial.c | |
| parent | omap2/3/4: serial: kill dev_attr_sleep_timeout sparse warn (diff) | |
| download | kernel-qcow2-linux-5a927b36f56c2a937e67f0947f233f723660f690.tar.gz kernel-qcow2-linux-5a927b36f56c2a937e67f0947f233f723660f690.tar.xz kernel-qcow2-linux-5a927b36f56c2a937e67f0947f233f723660f690.zip | |
omap2/3/4: serial: introduce errata handling
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>
Diffstat (limited to 'arch/arm/mach-omap2/serial.c')
| -rw-r--r-- | arch/arm/mach-omap2/serial.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c index 584a2ed39ab4..009b63fc79f0 100644 --- a/arch/arm/mach-omap2/serial.c +++ b/arch/arm/mach-omap2/serial.c @@ -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; } |