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/*
* 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/export.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);
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