Commit | Line | Data |
---|---|---|
87a1b26c PW |
1 | /* |
2 | * OMAP2xxx osc_clk-specific clock code | |
3 | * | |
4 | * Copyright (C) 2005-2008 Texas Instruments, Inc. | |
5 | * Copyright (C) 2004-2010 Nokia Corporation | |
6 | * | |
7 | * Contacts: | |
8 | * Richard Woodruff <r-woodruff2@ti.com> | |
9 | * Paul Walmsley | |
10 | * | |
11 | * Based on earlier work by Tuukka Tikkanen, Tony Lindgren, | |
12 | * Gordon McNutt and RidgeRun, Inc. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License version 2 as | |
16 | * published by the Free Software Foundation. | |
17 | */ | |
18 | #undef DEBUG | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/clk.h> | |
24 | #include <linux/io.h> | |
25 | ||
87a1b26c PW |
26 | #include "clock.h" |
27 | #include "clock2xxx.h" | |
59fb659b | 28 | #include "prm2xxx_3xxx.h" |
87a1b26c PW |
29 | #include "prm-regbits-24xx.h" |
30 | ||
cc1d230c PW |
31 | /* |
32 | * XXX This does not actually enable the osc_ck, since the osc_ck must | |
33 | * be running for this function to be called. Instead, this function | |
34 | * is used to disable an autoidle mode on the osc_ck. The existing | |
35 | * clk_enable/clk_disable()-based usecounting for osc_ck should be | |
36 | * replaced with autoidle-based usecounting. | |
37 | */ | |
ed1ebc49 | 38 | int omap2_enable_osc_ck(struct clk_hw *clk) |
87a1b26c PW |
39 | { |
40 | u32 pcc; | |
41 | ||
42 | pcc = __raw_readl(prcm_clksrc_ctrl); | |
43 | ||
44 | __raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl); | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
cc1d230c PW |
49 | /* |
50 | * XXX This does not actually disable the osc_ck, since doing so would | |
51 | * immediately halt the system. Instead, this function is used to | |
52 | * enable an autoidle mode on the osc_ck. The existing | |
53 | * clk_enable/clk_disable()-based usecounting for osc_ck should be | |
54 | * replaced with autoidle-based usecounting. | |
55 | */ | |
ed1ebc49 | 56 | void omap2_disable_osc_ck(struct clk_hw *clk) |
87a1b26c PW |
57 | { |
58 | u32 pcc; | |
59 | ||
60 | pcc = __raw_readl(prcm_clksrc_ctrl); | |
61 | ||
62 | __raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl); | |
63 | } | |
64 | ||
ed1ebc49 RN |
65 | unsigned long omap2_osc_clk_recalc(struct clk_hw *clk, |
66 | unsigned long parent_rate) | |
87a1b26c PW |
67 | { |
68 | return omap2xxx_get_apll_clkin() * omap2xxx_get_sysclkdiv(); | |
69 | } |