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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>
This commit is contained in:
Feng Tang 2011-02-22 15:28:12 +08:00 committed by Greg Kroah-Hartman
parent 085a4f758f
commit f023eab379
1 changed files with 11 additions and 0 deletions
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11
drivers/tty/serial/mfd.c
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@ -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++;
}