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author | Paul Walmsley <paul@pwsan.com> | 2010-02-23 08:09:20 +0300 |
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committer | Paul Walmsley <paul@pwsan.com> | 2010-02-24 22:16:15 +0300 |
commit | 657ebfadc19c5a14f709dee1645082828330d5d4 (patch) | |
tree | 26d615ae6e76437e0852b8d7fc060a070786f369 /arch/arm/mach-omap2/clock36xx.c | |
parent | b92c170d019db7554db95380d2e1dfb3a368e350 (diff) | |
download | linux-657ebfadc19c5a14f709dee1645082828330d5d4.tar.xz |
OMAP3/4 clock: split into per-chip family files
clock34xx_data.c now contains data for the OMAP34xx family, the
OMAP36xx family, and the OMAP3517 family, so rename it to
clock3xxx_data.c. Rename clock34xx.c to clock3xxx.c, and move the
chip family-specific clock functions to clock34xx.c, clock36xx.c, or
clock3517.c, as appropriate. So now "clock3xxx.*" refers to the OMAP3
superset.
The main goal here is to prepare to compile chip family-specific clock
functions only for kernel builds that target that chip family. To get to
that point, we also need to add CONFIG_SOC_* options for those other
chip families; that will be done in future patches, planned for 2.6.35.
OMAP4 is also affected by this. It duplicated the OMAP3 non-CORE DPLL
clkops structure. The OMAP4 variant of this clkops structure has been
removed, and since there was nothing else currently in clock44xx.c, it
too has been removed -- it can always be added back later when there
is some content for it. (The OMAP4 clock autogeneration scripts have been
updated accordingly.)
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: BenoƮt Cousson <b-cousson@ti.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Ranjith Lohithakshan <ranjithl@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap2/clock36xx.c')
-rw-r--r-- | arch/arm/mach-omap2/clock36xx.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/clock36xx.c b/arch/arm/mach-omap2/clock36xx.c new file mode 100644 index 000000000000..0c5e25ed8879 --- /dev/null +++ b/arch/arm/mach-omap2/clock36xx.c @@ -0,0 +1,72 @@ +/* + * OMAP36xx-specific clkops + * + * Copyright (C) 2010 Texas Instruments, Inc. + * Copyright (C) 2010 Nokia Corporation + * + * Mike Turquette + * Vijaykumar GN + * Paul Walmsley + * + * Parts of this code are based on code written by + * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu, + * Russell King + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/clk.h> +#include <linux/io.h> + +#include <plat/clock.h> + +#include "clock.h" +#include "clock36xx.h" + + +/** + * omap36xx_pwrdn_clk_enable_with_hsdiv_restore - enable clocks suffering + * from HSDivider PWRDN problem Implements Errata ID: i556. + * @clk: DPLL output struct clk + * + * 3630 only: dpll3_m3_ck, dpll4_m2_ck, dpll4_m3_ck, dpll4_m4_ck, + * dpll4_m5_ck & dpll4_m6_ck dividers gets loaded with reset + * valueafter their respective PWRDN bits are set. Any dummy write + * (Any other value different from the Read value) to the + * corresponding CM_CLKSEL register will refresh the dividers. + */ +static int omap36xx_pwrdn_clk_enable_with_hsdiv_restore(struct clk *clk) +{ + u32 dummy_v, orig_v, clksel_shift; + int ret; + + /* Clear PWRDN bit of HSDIVIDER */ + ret = omap2_dflt_clk_enable(clk); + + /* Restore the dividers */ + if (!ret) { + clksel_shift = __ffs(clk->parent->clksel_mask); + orig_v = __raw_readl(clk->parent->clksel_reg); + dummy_v = orig_v; + + /* Write any other value different from the Read value */ + dummy_v ^= (1 << clksel_shift); + __raw_writel(dummy_v, clk->parent->clksel_reg); + + /* Write the original divider */ + __raw_writel(orig_v, clk->parent->clksel_reg); + } + + return ret; +} + +const struct clkops clkops_omap36xx_pwrdn_with_hsdiv_wait_restore = { + .enable = omap36xx_pwrdn_clk_enable_with_hsdiv_restore, + .disable = omap2_dflt_clk_disable, + .find_companion = omap2_clk_dflt_find_companion, + .find_idlest = omap2_clk_dflt_find_idlest, +}; |