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Commit f023eab3 authored by Feng Tang's avatar Feng Tang Committed by Greg Kroah-Hartman
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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: default avatarFeng Tang <feng.tang@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 085a4f75

drivers/tty/serial/mfd.c

+11 −0
Original line number Diff line number Diff line
@@ -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++;

	}