diff options
Diffstat (limited to 'arch/mips/loongson2ef/lemote-2f/clock.c')
| -rw-r--r-- | arch/mips/loongson2ef/lemote-2f/clock.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/mips/loongson2ef/lemote-2f/clock.c b/arch/mips/loongson2ef/lemote-2f/clock.c new file mode 100644 index 000000000..850b6b9f8 --- /dev/null +++ b/arch/mips/loongson2ef/lemote-2f/clock.c @@ -0,0 +1,51 @@ +/* + * Copyright (C) 2006 - 2008 Lemote Inc. & Institute of Computing Technology + * Author: Yanhua, yanh@lemote.com + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/cpufreq.h> +#include <linux/errno.h> +#include <linux/export.h> + +#include <asm/mach-loongson2ef/loongson.h> + +enum { + DC_ZERO, DC_25PT = 2, DC_37PT, DC_50PT, DC_62PT, DC_75PT, + DC_87PT, DC_DISABLE, DC_RESV +}; + +struct cpufreq_frequency_table loongson2_clockmod_table[] = { + {0, DC_RESV, CPUFREQ_ENTRY_INVALID}, + {0, DC_ZERO, CPUFREQ_ENTRY_INVALID}, + {0, DC_25PT, 0}, + {0, DC_37PT, 0}, + {0, DC_50PT, 0}, + {0, DC_62PT, 0}, + {0, DC_75PT, 0}, + {0, DC_87PT, 0}, + {0, DC_DISABLE, 0}, + {0, DC_RESV, CPUFREQ_TABLE_END}, +}; +EXPORT_SYMBOL_GPL(loongson2_clockmod_table); + +int loongson2_cpu_set_rate(unsigned long rate_khz) +{ + struct cpufreq_frequency_table *pos; + int regval; + + cpufreq_for_each_valid_entry(pos, loongson2_clockmod_table) + if (rate_khz == pos->frequency) + break; + if (rate_khz != pos->frequency) + return -ENOTSUPP; + + regval = readl(LOONGSON_CHIPCFG); + regval = (regval & ~0x7) | (pos->driver_data - 1); + writel(regval, LOONGSON_CHIPCFG); + + return 0; +} +EXPORT_SYMBOL_GPL(loongson2_cpu_set_rate); |