Tegra2: Add more clock support

Tegra2: Add more clock support

This adds functions to enable/disable clocks and reset to on-chip peripherals.

BUG=chromium-os:13875
TEST=build U-Boot for Seaboard, boot

Change-Id: I80fe1d0c0b7dd10aa58ce5bb1d9290b6664d5413

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=849880f

[sjg, 2011-04-21 23:45:54]

Here are some clock functions and cleaning up of the structures. This is
desirable rather than every file manually hacking these registers. It becomes
more important with USB support.

[Tom Warren, 2011-04-26 18:15:32]

Just some comments that need fixin'. Otherwise, LGTM.

http://codereview.chromium.org/6900006/diff/1/arch/arm/cpu/armv7/tegra2/clock.c
File arch/arm/cpu/armv7/tegra2/clock.c (right):

http://codereview.chromium.org/6900006/diff/1/arch/arm/cpu/armv7/tegra2/clock...
arch/arm/cpu/armv7/tegra2/clock.c:88: // calculate the stable time
Needs to be a classic C comment (/* */) for upstream.

http://codereview.chromium.org/6900006/diff/1/arch/arm/cpu/armv7/tegra2/clock...
arch/arm/cpu/armv7/tegra2/clock.c:99: /* Enable clk to UART */
S/B 'Enable clk to periph'? or 'device' or 'toy'

http://codereview.chromium.org/6900006/diff/1/arch/arm/cpu/armv7/tegra2/clock...
arch/arm/cpu/armv7/tegra2/clock.c:126: /* Enable clk to UART */
Same as above, replace UART w/periph, device, etc. And it should be 'reset', not
'clk'.

http://codereview.chromium.org/6900006/diff/1/arch/arm/include/asm/arch-tegra...
File arch/arm/include/asm/arch-tegra2/clk_rst.h (right):

http://codereview.chromium.org/6900006/diff/1/arch/arm/include/asm/arch-tegra...
arch/arm/include/asm/arch-tegra2/clk_rst.h:50: 
I'd like to see the values (6, 3, 3) lined up w/tabs, as well as the comments.

http://codereview.chromium.org/6900006/diff/1/arch/arm/include/asm/arch-tegra...
arch/arm/include/asm/arch-tegra2/clk_rst.h:55: uint
crc_clk_out_enb[TEGRA_CLK_REGS]; /* _CLK_OUT_ENB_L/H/U_0 */
Ditto. Line up comments.

[sjg, 2011-04-26 21:24:31]

http://codereview.chromium.org/6900006/diff/1/arch/arm/cpu/armv7/tegra2/clock.c
File arch/arm/cpu/armv7/tegra2/clock.c (right):

http://codereview.chromium.org/6900006/diff/1/arch/arm/cpu/armv7/tegra2/clock...
arch/arm/cpu/armv7/tegra2/clock.c:88: // calculate the stable time
On 2011/04/26 18:15:32, Tom Warren wrote:
> Needs to be a classic C comment (/* */) for upstream.

Done.

http://codereview.chromium.org/6900006/diff/1/arch/arm/cpu/armv7/tegra2/clock...
arch/arm/cpu/armv7/tegra2/clock.c:99: /* Enable clk to UART */
On 2011/04/26 18:15:32, Tom Warren wrote:
> S/B 'Enable clk to periph'? or 'device' or 'toy'

Done.

http://codereview.chromium.org/6900006/diff/1/arch/arm/cpu/armv7/tegra2/clock...
arch/arm/cpu/armv7/tegra2/clock.c:126: /* Enable clk to UART */
On 2011/04/26 18:15:32, Tom Warren wrote:
> Same as above, replace UART w/periph, device, etc. And it should be 'reset',
not
> 'clk'.

Done.

http://codereview.chromium.org/6900006/diff/1/arch/arm/include/asm/arch-tegra...
File arch/arm/include/asm/arch-tegra2/clk_rst.h (right):

http://codereview.chromium.org/6900006/diff/1/arch/arm/include/asm/arch-tegra...
arch/arm/include/asm/arch-tegra2/clk_rst.h:50: 
On 2011/04/26 18:15:32, Tom Warren wrote:
> I'd like to see the values (6, 3, 3) lined up w/tabs, as well as the comments.

Done.

http://codereview.chromium.org/6900006/diff/1/arch/arm/include/asm/arch-tegra...
arch/arm/include/asm/arch-tegra2/clk_rst.h:55: uint
crc_clk_out_enb[TEGRA_CLK_REGS]; /* _CLK_OUT_ENB_L/H/U_0 */
On 2011/04/26 18:15:32, Tom Warren wrote:
> Ditto. Line up comments.

Have done as best I can given line length limitations