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| author | Feng Tang <feng.tang@intel.com> | 2011-02-22 15:28:12 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-02-22 15:49:00 -0800 |
| commit | f023eab379821365bf265a0240f30c00cecaef7c (patch) | |
| tree | 7c8f5f5b847d4200e346a384412932de151c0529 /drivers/tty/serial/mfd.c | |
| parent | 085a4f758f0cf95e1865b63892bf4304a149f0ca (diff) | |
| download | linux-f023eab379821365bf265a0240f30c00cecaef7c.tar.gz | |
serial: mfd: add a module parameter for setting each port's working mode
The three identical uart ports can work either in DMA or PIO mode. Adding such a module parameter "hsu_dma_enable" will enable user to chose working modes for each port. If the mfd driver is built in kernel, adding a "mfd.hsu_dma_enable=x" in kernel command line has the same effect. Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty/serial/mfd.c')
| -rw-r--r-- | drivers/tty/serial/mfd.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/tty/serial/mfd.c b/drivers/tty/serial/mfd.c index 53ff6af16273..c111f36f5d21 100644 --- a/drivers/tty/serial/mfd.c +++ b/drivers/tty/serial/mfd.c @@ -47,6 +47,11 @@ #define mfd_readl(obj, offset) readl(obj->reg + offset) #define mfd_writel(obj, offset, val) writel(val, obj->reg + offset) +static int hsu_dma_enable; +module_param(hsu_dma_enable, int, 0); +MODULE_PARM_DESC(hsu_dma_enable, "It is a bitmap to set working mode, if \ +bit[x] is 1, then port[x] will work in DMA mode, otherwise in PIO mode."); + struct hsu_dma_buffer { u8 *buf; dma_addr_t dma_addr; @@ -1367,6 +1372,12 @@ static void hsu_global_init(void) serial_hsu_ports[i] = uport; uport->index = i; + + if (hsu_dma_enable & (1<<i)) + uport->use_dma = 1; + else + uport->use_dma = 0; + uport++; } |