diff options
| author | Tom Warren <twarren.nvidia@gmail.com> | 2011-04-14 12:09:39 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2011-04-27 19:38:09 +0200 |
| commit | 1436d510764b5409daf0ff4948df66500a70869b (patch) | |
| tree | dee5b6f8beb82955533899f22b1be0d2df4fba1f /arch/arm/cpu/armv7/tegra2/ap20.c | |
| parent | 6445a3051efadcac1264998cb6387cd1aec2e935 (diff) | |
arm: Tegra2: Add missing PLLX init
Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch/arm/cpu/armv7/tegra2/ap20.c')
| -rw-r--r-- | arch/arm/cpu/armv7/tegra2/ap20.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/tegra2/ap20.c b/arch/arm/cpu/armv7/tegra2/ap20.c index d3e6797481..60dd5dfc08 100644 --- a/arch/arm/cpu/armv7/tegra2/ap20.c +++ b/arch/arm/cpu/armv7/tegra2/ap20.c @@ -32,6 +32,32 @@ u32 s_first_boot = 1; +void init_pllx(void) +{ + struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; + u32 reg; + + /* If PLLX is already enabled, just return */ + reg = readl(&clkrst->crc_pllx_base); + if (reg & PLL_ENABLE) + return; + + /* Set PLLX_MISC */ + reg = CPCON; /* CPCON[11:8] = 0001 */ + writel(reg, &clkrst->crc_pllx_misc); + + /* Use 12MHz clock here */ + reg = (PLL_BYPASS | PLL_DIVM); + reg |= (1000 << 8); /* DIVN = 0x3E8 */ + writel(reg, &clkrst->crc_pllx_base); + + reg |= PLL_ENABLE; + writel(reg, &clkrst->crc_pllx_base); + + reg &= ~PLL_BYPASS; + writel(reg, &clkrst->crc_pllx_base); +} + static void enable_cpu_clock(int enable) { struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; @@ -47,6 +73,9 @@ static void enable_cpu_clock(int enable) */ if (enable) { + /* Initialize PLLX */ + init_pllx(); + /* Wait until all clocks are stable */ udelay(PLL_STABILIZATION_DELAY); |