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author | Mika Westerberg <ext-mika.1.westerberg@nokia.com> | 2009-12-12 00:16:35 (GMT) |
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committer | Tony Lindgren <tony@atomide.com> | 2009-12-12 00:16:35 (GMT) |
commit | f62349ee9788b1d94c55eb6c291d74a1f69bdd9e (patch) | |
tree | 193154ad405a30910684c5521b797908db4e5dc9 /arch/arm/mach-omap2/serial.c | |
parent | edc961a2fa51cf3fceba8df8bb52c7a048e4661b (diff) | |
download | linux-fsl-qoriq-f62349ee9788b1d94c55eb6c291d74a1f69bdd9e.tar.xz |
OMAP3: serial - allow platforms specify which UARTs to initialize
This patch adds new function: omap_serial_init_port(port) that can be
used to initialize only selected UARTs as serial ports. Platforms can
then in their board files call this function instead of omap_serial_init()
if they don't want to use all UARTs as serial ports.
Signed-off-by: Mika Westerberg <ext-mika.1.westerberg@nokia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.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 | 70 |
1 files changed, 55 insertions, 15 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c index 2e17b57..6278fe5 100644 --- a/arch/arm/mach-omap2/serial.c +++ b/arch/arm/mach-omap2/serial.c @@ -631,24 +631,64 @@ void __init omap_serial_early_init(void) } } -void __init omap_serial_init(void) +/** + * omap_serial_init_port() - initialize single serial port + * @port: serial port number (0-3) + * + * This function initialies serial driver for given @port only. + * Platforms can call this function instead of omap_serial_init() + * if they don't plan to use all available UARTs as serial ports. + * + * Don't mix calls to omap_serial_init_port() and omap_serial_init(), + * use only one of the two. + */ +void __init omap_serial_init_port(int port) { - int i; + struct omap_uart_state *uart; + struct platform_device *pdev; + struct device *dev; - for (i = 0; i < ARRAY_SIZE(omap_uart); i++) { - struct omap_uart_state *uart = &omap_uart[i]; - struct platform_device *pdev = &uart->pdev; - struct device *dev = &pdev->dev; + BUG_ON(port < 0); + BUG_ON(port >= ARRAY_SIZE(omap_uart)); - omap_uart_reset(uart); - omap_uart_idle_init(uart); + uart = &omap_uart[port]; + pdev = &uart->pdev; + dev = &pdev->dev; - if (WARN_ON(platform_device_register(pdev))) - continue; - if ((cpu_is_omap34xx() && uart->padconf) || - (uart->wk_en && uart->wk_mask)) { - device_init_wakeup(dev, true); - DEV_CREATE_FILE(dev, &dev_attr_sleep_timeout); - } + omap_uart_reset(uart); + omap_uart_idle_init(uart); + + if (WARN_ON(platform_device_register(pdev))) + return; + + if ((cpu_is_omap34xx() && uart->padconf) || + (uart->wk_en && uart->wk_mask)) { + device_init_wakeup(dev, true); + DEV_CREATE_FILE(dev, &dev_attr_sleep_timeout); } + + /* omap44xx: Never read empty UART fifo + * omap3xxx: Never read empty UART fifo on UARTs + * with IP rev >=0x52 + */ + if (cpu_is_omap44xx()) + uart->p->serial_in = serial_in_override; + else if ((serial_read_reg(uart->p, UART_OMAP_MVER) & 0xFF) + >= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV) + uart->p->serial_in = serial_in_override; +} + +/** + * omap_serial_init() - intialize all supported serial ports + * + * Initializes all available UARTs as serial ports. Platforms + * can call this function when they want to have default behaviour + * for serial ports (e.g initialize them all as serial ports). + */ +void __init omap_serial_init(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(omap_uart); i++) + omap_serial_init_port(i); } |