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authorJuha Yrjola <juha.yrjola@solidboot.com>2006-09-25 05:41:37 -0400
committerTony Lindgren <tony@atomide.com>2006-09-25 05:41:37 -0400
commiteaca33df44c0d00bc12b16e72b728ade25adf14d (patch)
treee825e325d2b398cd14bccb1ed77a3007c63bd888 /arch/arm/mach-omap2/clock.c
parentdbab288be47ddc84ad52ff926ea1a0efd33acb57 (diff)
ARM: OMAP: Add write memory barriers to OMAP2 clock code
After adjusting clock parameters, OMAP2 CPUs need a memory barrier to make sure the changes go into effect immediately. Otherwise bad things will happen if we try to access the peripheral whose clock is just being enabled. Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap2/clock.c')
-rw-r--r--arch/arm/mach-omap2/clock.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
index 82643a211008..302d5a796340 100644
--- a/arch/arm/mach-omap2/clock.c
+++ b/arch/arm/mach-omap2/clock.c
@@ -135,6 +135,7 @@ static int _omap2_clk_enable(struct clk * clk)
135 regval32 = __raw_readl(clk->enable_reg); 135 regval32 = __raw_readl(clk->enable_reg);
136 regval32 |= (1 << clk->enable_bit); 136 regval32 |= (1 << clk->enable_bit);
137 __raw_writel(regval32, clk->enable_reg); 137 __raw_writel(regval32, clk->enable_reg);
138 wmb();
138 139
139 return 0; 140 return 0;
140} 141}
@@ -168,6 +169,7 @@ static void _omap2_clk_disable(struct clk *clk)
168 regval32 = __raw_readl(clk->enable_reg); 169 regval32 = __raw_readl(clk->enable_reg);
169 regval32 &= ~(1 << clk->enable_bit); 170 regval32 &= ~(1 << clk->enable_bit);
170 __raw_writel(regval32, clk->enable_reg); 171 __raw_writel(regval32, clk->enable_reg);
172 wmb();
171} 173}
172 174
173static int omap2_clk_enable(struct clk *clk) 175static int omap2_clk_enable(struct clk *clk)
@@ -697,12 +699,14 @@ static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
697 reg_val = __raw_readl(reg); 699 reg_val = __raw_readl(reg);
698 reg_val &= ~(field_mask << div_off); 700 reg_val &= ~(field_mask << div_off);
699 reg_val |= (field_val << div_off); 701 reg_val |= (field_val << div_off);
700
701 __raw_writel(reg_val, reg); 702 __raw_writel(reg_val, reg);
703 wmb();
702 clk->rate = clk->parent->rate / field_val; 704 clk->rate = clk->parent->rate / field_val;
703 705
704 if (clk->flags & DELAYED_APP) 706 if (clk->flags & DELAYED_APP) {
705 __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL); 707 __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
708 wmb();
709 }
706 ret = 0; 710 ret = 0;
707 } else if (clk->set_rate != 0) 711 } else if (clk->set_rate != 0)
708 ret = clk->set_rate(clk, rate); 712 ret = clk->set_rate(clk, rate);
@@ -838,10 +842,12 @@ static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
838 reg_val = __raw_readl(reg) & ~(field_mask << src_off); 842 reg_val = __raw_readl(reg) & ~(field_mask << src_off);
839 reg_val |= (field_val << src_off); 843 reg_val |= (field_val << src_off);
840 __raw_writel(reg_val, reg); 844 __raw_writel(reg_val, reg);
845 wmb();
841 846
842 if (clk->flags & DELAYED_APP) 847 if (clk->flags & DELAYED_APP) {
843 __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL); 848 __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
844 849 wmb();
850 }
845 if (clk->usecount > 0) 851 if (clk->usecount > 0)
846 _omap2_clk_enable(clk); 852 _omap2_clk_enable(clk);
847 853