diff options
Diffstat (limited to 'arch/mips/lantiq/xway/clk-xway.c')
| -rw-r--r-- | arch/mips/lantiq/xway/clk-xway.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/arch/mips/lantiq/xway/clk-xway.c b/arch/mips/lantiq/xway/clk-xway.c new file mode 100644 index 0000000..ddd3959 --- /dev/null +++ b/arch/mips/lantiq/xway/clk-xway.c @@ -0,0 +1,223 @@ +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Copyright (C) 2010 John Crispin <blogic@openwrt.org> + */ + +#include <linux/io.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/clk.h> + +#include <asm/time.h> +#include <asm/irq.h> +#include <asm/div64.h> + +#include <lantiq_soc.h> + +static unsigned int ltq_ram_clocks[] = { + CLOCK_167M, CLOCK_133M, CLOCK_111M, CLOCK_83M }; +#define DDR_HZ ltq_ram_clocks[ltq_cgu_r32(LTQ_CGU_SYS) & 0x3] + +#define BASIC_FREQUENCY_1 35328000 +#define BASIC_FREQUENCY_2 36000000 +#define BASIS_REQUENCY_USB 12000000 + +#define GET_BITS(x, msb, lsb) \ + (((x) & ((1 << ((msb) + 1)) - 1)) >> (lsb)) + +#define LTQ_CGU_PLL0_CFG 0x0004 +#define LTQ_CGU_PLL1_CFG 0x0008 +#define LTQ_CGU_PLL2_CFG 0x000C +#define LTQ_CGU_SYS 0x0010 +#define LTQ_CGU_UPDATE 0x0014 +#define LTQ_CGU_IF_CLK 0x0018 +#define LTQ_CGU_OSC_CON 0x001C +#define LTQ_CGU_SMD 0x0020 +#define LTQ_CGU_CT1SR 0x0028 +#define LTQ_CGU_CT2SR 0x002C +#define LTQ_CGU_PCMCR 0x0030 +#define LTQ_CGU_PCI_CR 0x0034 +#define LTQ_CGU_PD_PC 0x0038 +#define LTQ_CGU_FMR 0x003C + +#define CGU_PLL0_PHASE_DIVIDER_ENABLE \ + (ltq_cgu_r32(LTQ_CGU_PLL0_CFG) & (1 << 31)) +#define CGU_PLL0_BYPASS \ + (ltq_cgu_r32(LTQ_CGU_PLL0_CFG) & (1 << 30)) +#define CGU_PLL0_CFG_DSMSEL \ + (ltq_cgu_r32(LTQ_CGU_PLL0_CFG) & (1 << 28)) +#define CGU_PLL0_CFG_FRAC_EN \ + (ltq_cgu_r32(LTQ_CGU_PLL0_CFG) & (1 << 27)) +#define CGU_PLL1_SRC \ + (ltq_cgu_r32(LTQ_CGU_PLL1_CFG) & (1 << 31)) +#define CGU_PLL2_PHASE_DIVIDER_ENABLE \ + (ltq_cgu_r32(LTQ_CGU_PLL2_CFG) & (1 << 20)) +#define CGU_SYS_FPI_SEL (1 << 6) +#define CGU_SYS_DDR_SEL 0x3 +#define CGU_PLL0_SRC (1 << 29) + +#define CGU_PLL0_CFG_PLLK GET_BITS(ltq_cgu_r32(LTQ_CGU_PLL0_CFG), 26, 17) +#define CGU_PLL0_CFG_PLLN GET_BITS(ltq_cgu_r32(LTQ_CGU_PLL0_CFG), 12, 6) +#define CGU_PLL0_CFG_PLLM GET_BITS(ltq_cgu_r32(LTQ_CGU_PLL0_CFG), 5, 2) +#define CGU_PLL2_SRC GET_BITS(ltq_cgu_r32(LTQ_CGU_PLL2_CFG), 18, 17) +#define CGU_PLL2_CFG_INPUT_DIV GET_BITS(ltq_cgu_r32(LTQ_CGU_PLL2_CFG), 16, 13) + +static unsigned int ltq_get_pll0_fdiv(void); + +static inline unsigned int get_input_clock(int pll) +{ + switch (pll) { + case 0: + if (ltq_cgu_r32(LTQ_CGU_PLL0_CFG) & CGU_PLL0_SRC) + return BASIS_REQUENCY_USB; + else if (CGU_PLL0_PHASE_DIVIDER_ENABLE) + return BASIC_FREQUENCY_1; + else + return BASIC_FREQUENCY_2; + case 1: + if (CGU_PLL1_SRC) + return BASIS_REQUENCY_USB; + else if (CGU_PLL0_PHASE_DIVIDER_ENABLE) + return BASIC_FREQUENCY_1; + else + return BASIC_FREQUENCY_2; + case 2: + switch (CGU_PLL2_SRC) { + case 0: + return ltq_get_pll0_fdiv(); + case 1: + return CGU_PLL2_PHASE_DIVIDER_ENABLE ? + BASIC_FREQUENCY_1 : + BASIC_FREQUENCY_2; + case 2: + return BASIS_REQUENCY_USB; + } + default: + return 0; + } +} + +static inline unsigned int cal_dsm(int pll, unsigned int num, unsigned int den) +{ + u64 res, clock = get_input_clock(pll); + + res = num * clock; + do_div(res, den); + return res; +} + +static inline unsigned int mash_dsm(int pll, unsigned int M, unsigned int N, + unsigned int K) +{ + unsigned int num = ((N + 1) << 10) + K; + unsigned int den = (M + 1) << 10; + + return cal_dsm(pll, num, den); +} + +static inline unsigned int ssff_dsm_1(int pll, unsigned int M, unsigned int N, + unsigned int K) +{ + unsigned int num = ((N + 1) << 11) + K + 512; + unsigned int den = (M + 1) << 11; + + return cal_dsm(pll, num, den); +} + +static inline unsigned int ssff_dsm_2(int pll, unsigned int M, unsigned int N, + unsigned int K) +{ + unsigned int num = K >= 512 ? + ((N + 1) << 12) + K - 512 : ((N + 1) << 12) + K + 3584; + unsigned int den = (M + 1) << 12; + + return cal_dsm(pll, num, den); +} + +static inline unsigned int dsm(int pll, unsigned int M, unsigned int N, + unsigned int K, unsigned int dsmsel, unsigned int phase_div_en) +{ + if (!dsmsel) + return mash_dsm(pll, M, N, K); + else if (!phase_div_en) + return mash_dsm(pll, M, N, K); + else + return ssff_dsm_2(pll, M, N, K); +} + +static inline unsigned int ltq_get_pll0_fosc(void) +{ + if (CGU_PLL0_BYPASS) + return get_input_clock(0); + else + return !CGU_PLL0_CFG_FRAC_EN + ? dsm(0, CGU_PLL0_CFG_PLLM, CGU_PLL0_CFG_PLLN, 0, + CGU_PLL0_CFG_DSMSEL, + CGU_PLL0_PHASE_DIVIDER_ENABLE) + : dsm(0, CGU_PLL0_CFG_PLLM, CGU_PLL0_CFG_PLLN, + CGU_PLL0_CFG_PLLK, CGU_PLL0_CFG_DSMSEL, + CGU_PLL0_PHASE_DIVIDER_ENABLE); +} + +static unsigned int ltq_get_pll0_fdiv(void) +{ + unsigned int div = CGU_PLL2_CFG_INPUT_DIV + 1; + + return (ltq_get_pll0_fosc() + (div >> 1)) / div; +} + +unsigned int ltq_get_io_region_clock(void) +{ + unsigned int ret = ltq_get_pll0_fosc(); + + switch (ltq_cgu_r32(LTQ_CGU_PLL2_CFG) & CGU_SYS_DDR_SEL) { + default: + case 0: + return (ret + 1) / 2; + case 1: + return (ret * 2 + 2) / 5; + case 2: + return (ret + 1) / 3; + case 3: + return (ret + 2) / 4; + } +} +EXPORT_SYMBOL(ltq_get_io_region_clock); + +unsigned int ltq_get_fpi_bus_clock(int fpi) +{ + unsigned int ret = ltq_get_io_region_clock(); + + if ((fpi == 2) && (ltq_cgu_r32(LTQ_CGU_SYS) & CGU_SYS_FPI_SEL)) + ret >>= 1; + return ret; +} +EXPORT_SYMBOL(ltq_get_fpi_bus_clock); + +unsigned int ltq_get_cpu_hz(void) +{ + switch (ltq_cgu_r32(LTQ_CGU_SYS) & 0xc) { + case 0: + return CLOCK_333M; + case 4: + return DDR_HZ; + case 8: + return DDR_HZ << 1; + default: + return DDR_HZ >> 1; + } +} +EXPORT_SYMBOL(ltq_get_cpu_hz); + +unsigned int ltq_get_fpi_hz(void) +{ + unsigned int ddr_clock = DDR_HZ; + + if (ltq_cgu_r32(LTQ_CGU_SYS) & 0x40) + return ddr_clock >> 1; + return ddr_clock; +} +EXPORT_SYMBOL(ltq_get_fpi_hz); |