linux-kernel - Re: [PATCH] serial: Add OMAP high-speed UART driver.

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Date:	Mon, 1 Mar 2010 22:52:24 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	"G, Manjunath Kondaiah" <manjugk@...com>
Cc:	"Raja, Govindraj" <govindraj.raja@...com>,
	Greg KH <greg@...ah.com>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH] serial: Add OMAP high-speed UART driver.

* G, Manjunath Kondaiah <manjugk@...com> [100301 22:24]:
> 
> 
> 
> > > > > +	up->uart_dma.prev_rx_dma_pos = 
> > up->uart_dma.rx_buf_dma_phys;
> > > > > +	if (cpu_is_omap44xx())
> > > > > +		omap_writel(0, OMAP44XX_DMA4_BASE
> > > > > +			+ 
> > OMAP_DMA4_CDAC(up->uart_dma.rx_dma_channel));
> > > > > +	else
> > > > > +		omap_writel(0, OMAP34XX_DMA4_BASE
> > > > > +			+ 
> > OMAP_DMA4_CDAC(up->uart_dma.rx_dma_channel));
> > > > 
> > > > NAK. Please don't use omap_read/write for for new code. And do not
> > > > tinker with the omap hardware registers directly in the driver.
> > > > 
> > > > This needs to be done properly in 
> > arch/arm/plat-omap/dma.c instead.
> > > 
> > > Thanks for the suggestion.
> > > 
> > > Currently, dma_read/dma_write are #define's in dma.c which 
> > cannot be 
> > > accessed outside dma.c. I don't see any API's in dma.c for 
> > setting required 
> > > value for this register?
> > 
> > Hmm isn't this the same as omap_get_dma_dst_pos(int lch)? If you're
> > trying do something that's not in dma.c, we can add a new function
> > for it.
> 
> The omap_get_dma_dst_pos(int lch) is for read operation in CDAC register. 
> But, We need to write required value into CDAC register. For this, I propose:
> 
> omap_set_dma_dst_pos(int lch, int value) which does not exist in current dma 
> driver.

OK, it that's needed.

Tony
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