projects / deliverable / linux.git / blame
| 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 | ||
| 26 | #include <plat/clock.h> | |
| 27 | ||
| 28 | #include "clock.h" | |
| 29 | #include "clock2xxx.h" | |
| 59fb659b | 30 | #include "prm2xxx_3xxx.h" |
| 87a1b26c PW |
31 | #include "prm-regbits-24xx.h" |
| 32 | ||
| cc1d230c PW |
33 | /* |
| 34 | * XXX This does not actually enable the osc_ck, since the osc_ck must | |
| 35 | * be running for this function to be called. Instead, this function | |
| 36 | * is used to disable an autoidle mode on the osc_ck. The existing | |
| 37 | * clk_enable/clk_disable()-based usecounting for osc_ck should be | |
| 38 | * replaced with autoidle-based usecounting. | |
| 39 | */ | |
| 87a1b26c PW |
40 | static int omap2_enable_osc_ck(struct clk *clk) |
| 41 | { | |
| 42 | u32 pcc; | |
| 43 | ||
| 44 | pcc = __raw_readl(prcm_clksrc_ctrl); | |
| 45 | ||
| 46 | __raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl); | |
| 47 | ||
| 48 | return 0; | |
| 49 | } | |
| 50 | ||
| cc1d230c PW |
51 | /* |
| 52 | * XXX This does not actually disable the osc_ck, since doing so would | |
| 53 | * immediately halt the system. Instead, this function is used to | |
| 54 | * enable an autoidle mode on the osc_ck. The existing | |
| 55 | * clk_enable/clk_disable()-based usecounting for osc_ck should be | |
| 56 | * replaced with autoidle-based usecounting. | |
| 57 | */ | |
| 87a1b26c PW |
58 | static void omap2_disable_osc_ck(struct clk *clk) |
| 59 | { | |
| 60 | u32 pcc; | |
| 61 | ||
| 62 | pcc = __raw_readl(prcm_clksrc_ctrl); | |
| 63 | ||
| 64 | __raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl); | |
| 65 | } | |
| 66 | ||
| 67 | const struct clkops clkops_oscck = { | |
| 68 | .enable = omap2_enable_osc_ck, | |
| 69 | .disable = omap2_disable_osc_ck, | |
| 70 | }; | |
| 71 | ||
| 72 | unsigned long omap2_osc_clk_recalc(struct clk *clk) | |
| 73 | { | |
| 74 | return omap2xxx_get_apll_clkin() * omap2xxx_get_sysclkdiv(); | |
| 75 | } | |
| 76 |