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