From: Paul Walmsley Date: Tue, 30 Oct 2012 02:55:53 +0000 (-0600) Subject: ARM: OMAP2xxx: clock: remove global 'dclk' variable X-Git-Tag: firefly_0821_release~3680^2~1477^2~1^2~2^2~10 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5f03937700e3991a0de801ade8374628f2c982d5;p=firefly-linux-kernel-4.4.55.git ARM: OMAP2xxx: clock: remove global 'dclk' variable Remove the global 'dclk' variable, instead replacing it with a variable local to the dpllcore clock type C file. This removes some of the special-case code surrounding the OMAP2xxx clock init. This patch is a prerequisite for the removal of the omap_prcm_restart() code from arch/arm/mach-omap2/prcm.c. It also cleans up some special-case OMAP2xxx clock code in the process. Signed-off-by: Paul Walmsley Tested-by: Vaibhav Hiremath --- diff --git a/arch/arm/mach-omap2/clkt2xxx_dpllcore.c b/arch/arm/mach-omap2/clkt2xxx_dpllcore.c index 3432f913f743..08a896ba3f5d 100644 --- a/arch/arm/mach-omap2/clkt2xxx_dpllcore.c +++ b/arch/arm/mach-omap2/clkt2xxx_dpllcore.c @@ -36,9 +36,15 @@ /* #define DOWN_VARIABLE_DPLL 1 */ /* Experimental */ +/* + * dpll_core_ck: pointer to the combined dpll_ck + core_ck on OMAP2xxx + * (currently defined as "dpll_ck" in the OMAP2xxx clock tree). Set + * during dpll_ck init and used later by omap2xxx_clk_get_core_rate(). + */ +static struct clk *dpll_core_ck; + /** * omap2xxx_clk_get_core_rate - return the CORE_CLK rate - * @clk: pointer to the combined dpll_ck + core_ck (currently "dpll_ck") * * Returns the CORE_CLK rate. CORE_CLK can have one of three rate * sources on OMAP2xxx: the DPLL CLKOUT rate, DPLL CLKOUTX2, or 32KHz @@ -46,12 +52,14 @@ * struct clk *dpll_ck, which is a composite clock of dpll_ck and * core_ck. */ -unsigned long omap2xxx_clk_get_core_rate(struct clk *clk) +unsigned long omap2xxx_clk_get_core_rate(void) { long long core_clk; u32 v; - core_clk = omap2_get_dpll_rate(clk); + WARN_ON(!dpll_core_ck); + + core_clk = omap2_get_dpll_rate(dpll_core_ck); v = omap2_cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); v &= OMAP24XX_CORE_CLK_SRC_MASK; @@ -99,7 +107,7 @@ static long omap2_dpllcore_round_rate(unsigned long target_rate) unsigned long omap2_dpllcore_recalc(struct clk *clk) { - return omap2xxx_clk_get_core_rate(clk); + return omap2xxx_clk_get_core_rate(); } int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate) @@ -109,7 +117,7 @@ int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate) struct prcm_config tmpset; const struct dpll_data *dd; - cur_rate = omap2xxx_clk_get_core_rate(dclk); + cur_rate = omap2xxx_clk_get_core_rate(); mult = omap2_cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); mult &= OMAP24XX_CORE_CLK_SRC_MASK; @@ -170,3 +178,19 @@ int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate) return 0; } +/** + * omap2xxx_clkt_dpllcore_init - clk init function for dpll_ck + * @clk: struct clk *dpll_ck + * + * Store a local copy of @clk in dpll_core_ck so other code can query + * the core rate without having to clk_get(), which can sleep. Must + * only be called once. No return value. XXX If the clock + * registration process is ever changed such that dpll_ck is no longer + * statically defined, this code may need to change to increment some + * kind of use count on dpll_ck. + */ +void omap2xxx_clkt_dpllcore_init(struct clk *clk) +{ + WARN(dpll_core_ck, "dpll_core_ck already set - should never happen"); + dpll_core_ck = clk; +} diff --git a/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c b/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c index c66276b2bf0a..311599405bfa 100644 --- a/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c +++ b/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c @@ -118,7 +118,7 @@ int omap2_select_table_rate(struct clk *clk, unsigned long rate) } curr_prcm_set = prcm; - cur_rate = omap2xxx_clk_get_core_rate(dclk); + cur_rate = omap2xxx_clk_get_core_rate(); if (prcm->dpll_speed == cur_rate / 2) { omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1); diff --git a/arch/arm/mach-omap2/clock2420_data.c b/arch/arm/mach-omap2/clock2420_data.c index da1e388f22f7..d1034858b87a 100644 --- a/arch/arm/mach-omap2/clock2420_data.c +++ b/arch/arm/mach-omap2/clock2420_data.c @@ -124,6 +124,7 @@ static struct clk dpll_ck = { .name = "dpll_ck", .ops = &clkops_omap2xxx_dpll_ops, .parent = &sys_ck, /* Can be func_32k also */ + .init = &omap2xxx_clkt_dpllcore_init, .dpll_data = &dpll_dd, .clkdm_name = "wkup_clkdm", .recalc = &omap2_dpllcore_recalc, @@ -1953,7 +1954,7 @@ int __init omap2420_clk_init(void) omap_clk_disable_autoidle_all(); /* Check the MPU rate set by bootloader */ - clkrate = omap2xxx_clk_get_core_rate(&dpll_ck); + clkrate = omap2xxx_clk_get_core_rate(); for (prcm = rate_table; prcm->mpu_speed; prcm++) { if (!(prcm->flags & cpu_mask)) continue; @@ -1979,7 +1980,6 @@ int __init omap2420_clk_init(void) /* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */ vclk = clk_get(NULL, "virt_prcm_set"); sclk = clk_get(NULL, "sys_ck"); - dclk = clk_get(NULL, "dpll_ck"); return 0; } diff --git a/arch/arm/mach-omap2/clock2430_data.c b/arch/arm/mach-omap2/clock2430_data.c index c97dafef894d..3e16eab4691d 100644 --- a/arch/arm/mach-omap2/clock2430_data.c +++ b/arch/arm/mach-omap2/clock2430_data.c @@ -123,6 +123,7 @@ static struct clk dpll_ck = { .name = "dpll_ck", .ops = &clkops_omap2xxx_dpll_ops, .parent = &sys_ck, /* Can be func_32k also */ + .init = &omap2xxx_clkt_dpllcore_init, .dpll_data = &dpll_dd, .clkdm_name = "wkup_clkdm", .recalc = &omap2_dpllcore_recalc, @@ -2052,7 +2053,7 @@ int __init omap2430_clk_init(void) omap_clk_disable_autoidle_all(); /* Check the MPU rate set by bootloader */ - clkrate = omap2xxx_clk_get_core_rate(&dpll_ck); + clkrate = omap2xxx_clk_get_core_rate(); for (prcm = rate_table; prcm->mpu_speed; prcm++) { if (!(prcm->flags & cpu_mask)) continue; @@ -2078,7 +2079,6 @@ int __init omap2430_clk_init(void) /* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */ vclk = clk_get(NULL, "virt_prcm_set"); sclk = clk_get(NULL, "sys_ck"); - dclk = clk_get(NULL, "dpll_ck"); return 0; } diff --git a/arch/arm/mach-omap2/clock2xxx.c b/arch/arm/mach-omap2/clock2xxx.c index 5feee16fee0e..8e0294e732f1 100644 --- a/arch/arm/mach-omap2/clock2xxx.c +++ b/arch/arm/mach-omap2/clock2xxx.c @@ -28,7 +28,7 @@ #include "cm.h" #include "cm-regbits-24xx.h" -struct clk *vclk, *sclk, *dclk; +struct clk *vclk, *sclk; /* * Omap24xx specific clock functions diff --git a/arch/arm/mach-omap2/clock2xxx.h b/arch/arm/mach-omap2/clock2xxx.h index cb6df8ca9e4a..19dc065901c7 100644 --- a/arch/arm/mach-omap2/clock2xxx.h +++ b/arch/arm/mach-omap2/clock2xxx.h @@ -15,10 +15,11 @@ unsigned long omap2xxx_sys_clk_recalc(struct clk *clk); unsigned long omap2_osc_clk_recalc(struct clk *clk); unsigned long omap2_dpllcore_recalc(struct clk *clk); int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate); -unsigned long omap2xxx_clk_get_core_rate(struct clk *clk); +unsigned long omap2xxx_clk_get_core_rate(void); u32 omap2xxx_get_apll_clkin(void); u32 omap2xxx_get_sysclkdiv(void); void omap2xxx_clk_prepare_for_reboot(void); +void omap2xxx_clkt_dpllcore_init(struct clk *clk); #ifdef CONFIG_SOC_OMAP2420 int omap2420_clk_init(void); @@ -34,8 +35,6 @@ int omap2430_clk_init(void); extern void __iomem *prcm_clksrc_ctrl, *cm_idlest_pll; -extern struct clk *dclk; - extern const struct clkops clkops_omap2430_i2chs_wait; extern const struct clkops clkops_oscck; extern const struct clkops clkops_apll96;