From a92614879128b8f797f0b3119ef42a129be5eded Mon Sep 17 00:00:00 2001 From: Stefan Wahren Date: Thu, 12 Feb 2015 20:30:07 +0000 Subject: [PATCH] Revert "clk: mxs: Fix invalid 32-bit access to frac registers" Revert commit 039e59707507 (clk: mxs: Fix invalid 32-bit access to frac registers), because it leads to a faulty spi communication on mx28evk. Signed-off-by: Stefan Wahren Reported-by: Fabio Estevam Tested-by: Fabio Estevam Signed-off-by: Michael Turquette --- drivers/clk/mxs/clk-imx23.c | 11 +++-------- drivers/clk/mxs/clk-imx28.c | 19 ++++++------------- drivers/clk/mxs/clk-ref.c | 19 +++++++++---------- 3 files changed, 18 insertions(+), 31 deletions(-) diff --git a/drivers/clk/mxs/clk-imx23.c b/drivers/clk/mxs/clk-imx23.c index a084566cf7e2..9fc9359f5133 100644 --- a/drivers/clk/mxs/clk-imx23.c +++ b/drivers/clk/mxs/clk-imx23.c @@ -46,13 +46,11 @@ static void __iomem *digctrl; #define BP_CLKSEQ_BYPASS_SAIF 0 #define BP_CLKSEQ_BYPASS_SSP 5 #define BP_SAIF_DIV_FRAC_EN 16 - -#define FRAC_IO 3 +#define BP_FRAC_IOFRAC 24 static void __init clk_misc_init(void) { u32 val; - u8 frac; /* Gate off cpu clock in WFI for power saving */ writel_relaxed(1 << BP_CPU_INTERRUPT_WAIT, CPU + SET); @@ -74,12 +72,9 @@ static void __init clk_misc_init(void) /* * 480 MHz seems too high to be ssp clock source directly, * so set frac to get a 288 MHz ref_io. - * According to reference manual we must access frac bytewise. */ - frac = readb_relaxed(FRAC + FRAC_IO); - frac &= ~0x3f; - frac |= 30; - writeb_relaxed(frac, FRAC + FRAC_IO); + writel_relaxed(0x3f << BP_FRAC_IOFRAC, FRAC + CLR); + writel_relaxed(30 << BP_FRAC_IOFRAC, FRAC + SET); } static const char *sel_pll[] __initconst = { "pll", "ref_xtal", }; diff --git a/drivers/clk/mxs/clk-imx28.c b/drivers/clk/mxs/clk-imx28.c index c541377838a8..a6c35010e4e5 100644 --- a/drivers/clk/mxs/clk-imx28.c +++ b/drivers/clk/mxs/clk-imx28.c @@ -53,9 +53,8 @@ static void __iomem *clkctrl; #define BP_ENET_SLEEP 31 #define BP_CLKSEQ_BYPASS_SAIF0 0 #define BP_CLKSEQ_BYPASS_SSP0 3 - -#define FRAC0_IO1 2 -#define FRAC0_IO0 3 +#define BP_FRAC0_IO1FRAC 16 +#define BP_FRAC0_IO0FRAC 24 static void __iomem *digctrl; #define DIGCTRL digctrl @@ -86,7 +85,6 @@ int mxs_saif_clkmux_select(unsigned int clkmux) static void __init clk_misc_init(void) { u32 val; - u8 frac; /* Gate off cpu clock in WFI for power saving */ writel_relaxed(1 << BP_CPU_INTERRUPT_WAIT, CPU + SET); @@ -120,16 +118,11 @@ static void __init clk_misc_init(void) /* * 480 MHz seems too high to be ssp clock source directly, * so set frac0 to get a 288 MHz ref_io0 and ref_io1. - * According to reference manual we must access frac0 bytewise. */ - frac = readb_relaxed(FRAC0 + FRAC0_IO0); - frac &= ~0x3f; - frac |= 30; - writeb_relaxed(frac, FRAC0 + FRAC0_IO0); - frac = readb_relaxed(FRAC0 + FRAC0_IO1); - frac &= ~0x3f; - frac |= 30; - writeb_relaxed(frac, FRAC0 + FRAC0_IO1); + val = readl_relaxed(FRAC0); + val &= ~((0x3f << BP_FRAC0_IO0FRAC) | (0x3f << BP_FRAC0_IO1FRAC)); + val |= (30 << BP_FRAC0_IO0FRAC) | (30 << BP_FRAC0_IO1FRAC); + writel_relaxed(val, FRAC0); } static const char *sel_cpu[] __initconst = { "ref_cpu", "ref_xtal", }; diff --git a/drivers/clk/mxs/clk-ref.c b/drivers/clk/mxs/clk-ref.c index ad3851c93c90..4adeed6c2f94 100644 --- a/drivers/clk/mxs/clk-ref.c +++ b/drivers/clk/mxs/clk-ref.c @@ -16,8 +16,6 @@ #include #include "clk.h" -#define BF_CLKGATE BIT(7) - /** * struct clk_ref - mxs reference clock * @hw: clk_hw for the reference clock @@ -41,7 +39,7 @@ static int clk_ref_enable(struct clk_hw *hw) { struct clk_ref *ref = to_clk_ref(hw); - writeb_relaxed(BF_CLKGATE, ref->reg + ref->idx + CLR); + writel_relaxed(1 << ((ref->idx + 1) * 8 - 1), ref->reg + CLR); return 0; } @@ -50,7 +48,7 @@ static void clk_ref_disable(struct clk_hw *hw) { struct clk_ref *ref = to_clk_ref(hw); - writeb_relaxed(BF_CLKGATE, ref->reg + ref->idx + SET); + writel_relaxed(1 << ((ref->idx + 1) * 8 - 1), ref->reg + SET); } static unsigned long clk_ref_recalc_rate(struct clk_hw *hw, @@ -58,7 +56,7 @@ static unsigned long clk_ref_recalc_rate(struct clk_hw *hw, { struct clk_ref *ref = to_clk_ref(hw); u64 tmp = parent_rate; - u8 frac = readb_relaxed(ref->reg + ref->idx) & 0x3f; + u8 frac = (readl_relaxed(ref->reg) >> (ref->idx * 8)) & 0x3f; tmp *= 18; do_div(tmp, frac); @@ -95,7 +93,8 @@ static int clk_ref_set_rate(struct clk_hw *hw, unsigned long rate, struct clk_ref *ref = to_clk_ref(hw); unsigned long flags; u64 tmp = parent_rate; - u8 frac, val; + u32 val; + u8 frac, shift = ref->idx * 8; tmp = tmp * 18 + rate / 2; do_div(tmp, rate); @@ -108,10 +107,10 @@ static int clk_ref_set_rate(struct clk_hw *hw, unsigned long rate, spin_lock_irqsave(&mxs_lock, flags); - val = readb_relaxed(ref->reg + ref->idx); - val &= ~0x3f; - val |= frac; - writeb_relaxed(val, ref->reg + ref->idx); + val = readl_relaxed(ref->reg); + val &= ~(0x3f << shift); + val |= frac << shift; + writel_relaxed(val, ref->reg); spin_unlock_irqrestore(&mxs_lock, flags); -- 2.34.1