diff options
| author | Varun Wadekar <vwadekar@nvidia.com> | 2011-03-31 16:04:16 +0530 |
|---|---|---|
| committer | Varun Colbert <vcolbert@nvidia.com> | 2011-04-01 19:25:50 -0700 |
| commit | 82727cdc199df35484927ba44813e431cc4a7944 (patch) | |
| tree | 9afad6688f59e5dc3f00164e08be688b97bd8f48 /arch | |
| parent | 4c92e4f2ac11913c4ba19d3ffc1be0f5ae8c4ca6 (diff) | |
ARM: tegra: fuse: calculate pgm cycles from oscillator freq
calculate the number of programming cycles to be used to burn
fuses from the oscillator frequency that is being used.
Bug 796825
Change-Id: I1698017f1c9661560d36a9ad613f6a4b1c51df46
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Reviewed-on: http://git-master/r/24922
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-tegra/tegra2_fuse.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/arch/arm/mach-tegra/tegra2_fuse.c b/arch/arm/mach-tegra/tegra2_fuse.c index 6da0c5d7c885..ac2f02cfb669 100644 --- a/arch/arm/mach-tegra/tegra2_fuse.c +++ b/arch/arm/mach-tegra/tegra2_fuse.c @@ -46,6 +46,7 @@ #include <linux/wakelock.h> #include <mach/tegra2_fuse.h> +#include <mach/iomap.h> #include "fuse.h" @@ -547,10 +548,21 @@ static int fuse_set(enum fuse_io_param io_param, u32 *param, int size) return 0; } +#define CAR_OSC_CTRL 0x50 +#define PMC_PLLP_OVERRIDE 0xF8 +#define PMC_OSC_OVERRIDE BIT(0) +#define PMC_OSC_FREQ_MASK (BIT(2) | BIT(3)) +#define PMC_OSC_FREQ_SHIFT 2 +#define CAR_OSC_FREQ_SHIFT 30 + +/* cycles corresponding to 13MHz, 19.2MHz, 12MHz, 26MHz */ +static int fuse_pgm_cycles[] = {130, 192, 120, 260}; + int tegra_fuse_program(struct fuse_data *pgm_data, u32 flags) { u32 reg; int i = 0; + int index; mutex_lock(&fuse_lock); reg = tegra_fuse_readl(FUSE_DIS_PGM); @@ -585,7 +597,18 @@ int tegra_fuse_program(struct fuse_data *pgm_data, u32 flags) regulator_enable(vdd_fuse); populate_fuse_arrs(&fuse_info, flags); - fuse_program_array(0); + + /* calculate the number of program cycles from the oscillator freq */ + reg = readl(IO_ADDRESS(TEGRA_PMC_BASE) + PMC_PLLP_OVERRIDE); + if (reg & PMC_OSC_OVERRIDE) { + index = (reg & PMC_OSC_FREQ_MASK) >> PMC_OSC_FREQ_SHIFT; + } else { + reg = readl(IO_ADDRESS(TEGRA_CLK_RESET_BASE) + CAR_OSC_CTRL); + index = reg >> CAR_OSC_FREQ_SHIFT; + } + + pr_debug("%s: use %d programming cycles\n", __func__, fuse_pgm_cycles[index]); + fuse_program_array(fuse_pgm_cycles[index]); /* disable program bit */ reg = 0; |