[PATCH 3/7] ARM: tegra: clock: Check for clk_num == 0
From: Colin Cross <hidden>
Date: 2011-02-22 02:41:39
Also in:
linux-tegra, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Peripheral clocks that have no clock enable bit in the enable registers have their clk_num set to 0. Bit 0 in the clock enable registers is the CPU clock. Prevent disables on these peripheral clocks from accidentally disabling the CPU clock. Signed-off-by: Colin Cross <redacted> --- arch/arm/mach-tegra/tegra2_clocks.c | 25 +++++++++++++++++++++++++ 1 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-tegra/tegra2_clocks.c b/arch/arm/mach-tegra/tegra2_clocks.c
index 73e112f..3015a2c 100644
--- a/arch/arm/mach-tegra/tegra2_clocks.c
+++ b/arch/arm/mach-tegra/tegra2_clocks.c@@ -946,9 +946,14 @@ static void tegra2_periph_clk_init(struct clk *c) } c->state = ON; + + if (!c->u.periph.clk_num) + return; + if (!(clk_readl(CLK_OUT_ENB + PERIPH_CLK_TO_ENB_REG(c)) & PERIPH_CLK_TO_ENB_BIT(c))) c->state = OFF; + if (!(c->flags & PERIPH_NO_RESET)) if (clk_readl(RST_DEVICES + PERIPH_CLK_TO_ENB_REG(c)) & PERIPH_CLK_TO_ENB_BIT(c))
@@ -962,6 +967,9 @@ static int tegra2_periph_clk_enable(struct clk *c) int refcount; pr_debug("%s on clock %s\n", __func__, c->name); + if (!c->u.periph.clk_num) + return 0; + spin_lock_irqsave(&clock_register_lock, flags); refcount = tegra_periph_clk_enable_refcount[c->u.periph.clk_num]++;
@@ -994,6 +1002,9 @@ static void tegra2_periph_clk_disable(struct clk *c) pr_debug("%s on clock %s\n", __func__, c->name); + if (!c->u.periph.clk_num) + return; + spin_lock_irqsave(&clock_register_lock, flags); if (c->refcnt)
@@ -1012,6 +1023,9 @@ static void tegra2_periph_clk_reset(struct clk *c, bool assert) pr_debug("%s %s on clock %s\n", __func__, assert ? "assert" : "deassert", c->name); + + BUG_ON(!c->u.periph.clk_num); + if (!(c->flags & PERIPH_NO_RESET)) clk_writel(PERIPH_CLK_TO_ENB_BIT(c), base + PERIPH_CLK_TO_ENB_SET_REG(c));
@@ -1182,6 +1196,10 @@ static void tegra2_clk_double_init(struct clk *c) c->mul = 2; c->div = 1; c->state = ON; + + if (!c->u.periph.clk_num) + return; + if (!(clk_readl(CLK_OUT_ENB + PERIPH_CLK_TO_ENB_REG(c)) & PERIPH_CLK_TO_ENB_BIT(c))) c->state = OFF;
@@ -1269,6 +1287,9 @@ static void tegra2_cdev_clk_init(struct clk *c) /* We could un-tristate the cdev1 or cdev2 pingroup here; this is * currently done in the pinmux code. */ c->state = ON; + + BUG_ON(!c->u.periph.clk_num); + if (!(clk_readl(CLK_OUT_ENB + PERIPH_CLK_TO_ENB_REG(c)) & PERIPH_CLK_TO_ENB_BIT(c))) c->state = OFF;
@@ -1276,6 +1297,8 @@ static void tegra2_cdev_clk_init(struct clk *c) static int tegra2_cdev_clk_enable(struct clk *c) { + BUG_ON(!c->u.periph.clk_num); + clk_writel(PERIPH_CLK_TO_ENB_BIT(c), CLK_OUT_ENB_SET + PERIPH_CLK_TO_ENB_SET_REG(c)); return 0;
@@ -1283,6 +1306,8 @@ static int tegra2_cdev_clk_enable(struct clk *c) static void tegra2_cdev_clk_disable(struct clk *c) { + BUG_ON(!c->u.periph.clk_num); + clk_writel(PERIPH_CLK_TO_ENB_BIT(c), CLK_OUT_ENB_CLR + PERIPH_CLK_TO_ENB_SET_REG(c)); }
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1.7.3.1