From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Walmsley Subject: [PATCH 24/27] omap2 clock: replace omap2_get_crystal_rate() with clock-specific recalc code Date: Mon, 27 Aug 2007 02:39:20 -0600 Message-ID: <20070827084124.458092052@pwsan.com> References: <20070827083856.549249288@pwsan.com> Return-path: Content-Disposition: inline; filename=use_custom_osc_sys_recalc.patch List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-omap-open-source-bounces@linux.omap.com Errors-To: linux-omap-open-source-bounces@linux.omap.com To: linux-omap-open-source@linux.omap.com List-Id: linux-omap@vger.kernel.org The OMAP2 clock framework currently uses a nonstandard function to assign the osc_ck and sys_ck rates, omap2_get_crystal_rate(). By using custom recalc code for these clocks, we can get rid of it and rely on the existing clock tree recalculation process. Signed-off-by: Paul Walmsley --- arch/arm/mach-omap2/clock.c | 44 ++++++++++++++++++++++++-------------------- arch/arm/mach-omap2/clock.h | 10 +++++----- 2 files changed, 29 insertions(+), 25 deletions(-) Index: linux-omap/arch/arm/mach-omap2/clock.c =================================================================== --- linux-omap.orig/arch/arm/mach-omap2/clock.c 2007-08-27 02:20:19.000000000 -0600 +++ linux-omap/arch/arm/mach-omap2/clock.c 2007-08-27 02:20:21.000000000 -0600 @@ -113,21 +113,6 @@ return; } -/* Recalculate SYST_CLK */ -static void omap2_sys_clk_recalc(struct clk * clk) -{ - u32 div; - - if (!cpu_is_omap34xx()) { - div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL); - /* Test if ext clk divided by 1 or 2 */ - div &= OMAP_SYSCLKDIV_MASK; - div >>= OMAP_SYSCLKDIV_SHIFT; - clk->rate = (clk->parent->rate / div); - } - propagate_rate(clk); -} - static u32 omap2_get_dpll_rate(struct clk * tclk) { long long dpll_clk; @@ -1045,9 +1030,9 @@ .clk_disable_unused = omap2_clk_disable_unused, }; -static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys) +static u32 omap2_get_apll_clkin(void) { - u32 div, aplls, sclk = 13000000; + u32 aplls, sclk = 0; aplls = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1); aplls &= OMAP24XX_APLLS_CLKIN_MASK; @@ -1060,12 +1045,30 @@ else if (aplls == APLLS_CLKIN_12MHZ) sclk = 12000000; + return sclk; +} + +static u32 omap2_get_sysclkdiv(void) +{ + u32 div; + div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL); div &= OMAP_SYSCLKDIV_MASK; div >>= OMAP_SYSCLKDIV_SHIFT; - osc->rate = sclk * div; - sys->rate = sclk; + return div; +} + +static void omap2_osc_clk_recalc(struct clk *clk) +{ + clk->rate = omap2_get_apll_clkin() * omap2_get_sysclkdiv(); + propagate_rate(clk); +} + +static void omap2_sys_clk_recalc(struct clk *clk) +{ + clk->rate = clk->parent->rate / omap2_get_sysclkdiv(); + propagate_rate(clk); } /* @@ -1117,7 +1120,8 @@ cpu_mask = RATE_IN_243X; clk_init(&omap2_clk_functions); - omap2_get_crystal_rate(&osc_ck, &sys_ck); + + omap2_osc_clk_recalc(&osc_ck); for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks); clkp++) { Index: linux-omap/arch/arm/mach-omap2/clock.h =================================================================== --- linux-omap.orig/arch/arm/mach-omap2/clock.h 2007-08-27 02:20:19.000000000 -0600 +++ linux-omap/arch/arm/mach-omap2/clock.h 2007-08-27 02:20:21.000000000 -0600 @@ -36,6 +36,8 @@ static u32 omap2_clksel_get_divisor(struct clk *clk); static u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val); static u32 omap2_divisor_to_clksel(struct clk *clk, u32 div); +static void omap2_osc_clk_recalc(struct clk *clk); +static void omap2_sys_clk_recalc(struct clk *clk); static void omap2_dpll_recalc(struct clk *clk); static void omap2_fixed_divisor_recalc(struct clk *clk); static int omap2_clk_fixed_enable(struct clk *clk); @@ -598,21 +600,19 @@ /* Typical 12/13MHz in standalone mode, will be 26Mhz in chassis mode */ static struct clk osc_ck = { /* (*12, *13, 19.2, *26, 38.4)MHz */ .name = "osc_ck", - .rate = 26000000, /* fixed up in clock init */ .flags = CLOCK_IN_OMAP242X | CLOCK_IN_OMAP243X | - RATE_FIXED | RATE_PROPAGATES, + RATE_PROPAGATES, .enable = &omap2_enable_osc_ck, .disable = &omap2_disable_osc_ck, - .recalc = &propagate_rate, + .recalc = &omap2_osc_clk_recalc, }; /* With out modem likely 12MHz, with modem likely 13MHz */ static struct clk sys_ck = { /* (*12, *13, 19.2, 26, 38.4)MHz */ .name = "sys_ck", /* ~ ref_clk also */ .parent = &osc_ck, - .rate = 13000000, .flags = CLOCK_IN_OMAP242X | CLOCK_IN_OMAP243X | - RATE_FIXED | ALWAYS_ENABLED | RATE_PROPAGATES, + ALWAYS_ENABLED | RATE_PROPAGATES, .recalc = &omap2_sys_clk_recalc, }; --