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ARM: tegra: clock: prevent accidental disables of cpu clock

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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 <ccross@android.com>
Acked-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Colin Cross 2011-02-21 16:44:07 -08:00
parent 421186e710
commit 1be3d05375
1 changed files with 25 additions and 0 deletions
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25
arch/arm/mach-tegra/tegra2_clocks.c
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@ -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));
}