u-boot/arch/arm/include/asm/arch-am33xx/clock.h
Dario Binacchi 165e8fe5db clk: ti: add am33xx/am43xx spread spectrum clock support
The patch enables spread spectrum clocking (SSC) for MPU and LCD PLLs.
As reported by the TI spruh73x/spruhl7x RM, SSC is only supported for
the DISP/LCD and MPU PLLs on am33xx/am43xx. SSC is not supported for
DDR, PER, and CORE PLLs.

Calculating the required values and setting the registers accordingly
was taken from the set_mpu_spreadspectrum routine contained in the
arch/arm/mach-omap2/am33xx/clock_am33xx.c file of the u-boot project.

In locked condition, DPLL output clock = CLKINP *[M/N]. In case of
SSC enabled, the reference manual explains that there is a restriction
of range of M values. Since the clk_ti_am3_dpll_round_rate() attempts
to select the minimum possible N, the value of M obtained is not
guaranteed to be within the range required. With the new "ti,min-div"
parameter it is possible to increase N and consequently M to satisfy the
constraint imposed by SSC.

Link: https://lore.kernel.org/r/20210606202253.31649-6-dariobin@libero.it
Signed-off-by: Dario Binacchi <dariobin@libero.it>
2021-10-11 14:27:32 -04:00

147 lines
4.4 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* clock.h
*
* clock header
*
* Copyright (C) 2011, Texas Instruments Incorporated - http://www.ti.com/
*/
#ifndef _CLOCKS_H_
#define _CLOCKS_H_
#include <asm/arch/clocks_am33xx.h>
#include <asm/arch/hardware.h>
#if defined(CONFIG_TI816X) || defined(CONFIG_TI814X)
#include <asm/arch/clock_ti81xx.h>
#endif
#define LDELAY 1000000
/*CM_<clock_domain>__CLKCTRL */
#define CD_CLKCTRL_CLKTRCTRL_SHIFT 0
#define CD_CLKCTRL_CLKTRCTRL_MASK 3
#define CD_CLKCTRL_CLKTRCTRL_NO_SLEEP 0
#define CD_CLKCTRL_CLKTRCTRL_SW_SLEEP 1
#define CD_CLKCTRL_CLKTRCTRL_SW_WKUP 2
/* CM_<clock_domain>_<module>_CLKCTRL */
#define MODULE_CLKCTRL_MODULEMODE_SHIFT 0
#define MODULE_CLKCTRL_MODULEMODE_MASK 3
#define MODULE_CLKCTRL_IDLEST_SHIFT 16
#define MODULE_CLKCTRL_IDLEST_MASK (3 << 16)
#define MODULE_CLKCTRL_MODULEMODE_SW_DISABLE 0
#define MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN 2
#define MODULE_CLKCTRL_IDLEST_FULLY_FUNCTIONAL 0
#define MODULE_CLKCTRL_IDLEST_TRANSITIONING 1
#define MODULE_CLKCTRL_IDLEST_IDLE 2
#define MODULE_CLKCTRL_IDLEST_DISABLED 3
/* CM_CLKMODE_DPLL */
#define CM_CLKMODE_DPLL_SSC_EN_SHIFT 12
#define CM_CLKMODE_DPLL_SSC_EN_MASK (1 << 12)
#define CM_CLKMODE_DPLL_SSC_ACK_MASK (1 << 13)
#define CM_CLKMODE_DPLL_SSC_DOWNSPREAD_MASK (1 << 14)
#define CM_CLKMODE_DPLL_SSC_TYPE_MASK (1 << 15)
#define CM_CLKMODE_DPLL_REGM4XEN_SHIFT 11
#define CM_CLKMODE_DPLL_REGM4XEN_MASK (1 << 11)
#define CM_CLKMODE_DPLL_LPMODE_EN_SHIFT 10
#define CM_CLKMODE_DPLL_LPMODE_EN_MASK (1 << 10)
#define CM_CLKMODE_DPLL_RELOCK_RAMP_EN_SHIFT 9
#define CM_CLKMODE_DPLL_RELOCK_RAMP_EN_MASK (1 << 9)
#define CM_CLKMODE_DPLL_DRIFTGUARD_EN_SHIFT 8
#define CM_CLKMODE_DPLL_DRIFTGUARD_EN_MASK (1 << 8)
#define CM_CLKMODE_DPLL_RAMP_RATE_SHIFT 5
#define CM_CLKMODE_DPLL_RAMP_RATE_MASK (0x7 << 5)
#define CM_CLKMODE_DPLL_EN_SHIFT 0
#define CM_CLKMODE_DPLL_EN_MASK (0x7 << 0)
#define CM_CLKMODE_DPLL_DPLL_EN_SHIFT 0
#define CM_CLKMODE_DPLL_DPLL_EN_MASK 7
#define DPLL_EN_STOP 1
#define DPLL_EN_MN_BYPASS 4
#define DPLL_EN_LOW_POWER_BYPASS 5
#define DPLL_EN_FAST_RELOCK_BYPASS 6
#define DPLL_EN_LOCK 7
/* CM_IDLEST_DPLL fields */
#define ST_DPLL_CLK_MASK 1
/* CM_CLKSEL_DPLL */
#define CM_CLKSEL_DPLL_M_SHIFT 8
#define CM_CLKSEL_DPLL_M_MASK (0x7FF << 8)
#define CM_CLKSEL_DPLL_N_SHIFT 0
#define CM_CLKSEL_DPLL_N_MASK 0x7F
/* CM_SSC_DELTAM_DPLL */
#define CM_SSC_DELTAM_DPLL_FRAC_SHIFT 0
#define CM_SSC_DELTAM_DPLL_FRAC_MASK GENMASK(17, 0)
#define CM_SSC_DELTAM_DPLL_INT_SHIFT 18
#define CM_SSC_DELTAM_DPLL_INT_MASK GENMASK(19, 18)
/* CM_SSC_MODFREQ_DPLL */
#define CM_SSC_MODFREQ_DPLL_MANT_SHIFT 0
#define CM_SSC_MODFREQ_DPLL_MANT_MASK GENMASK(6, 0)
#define CM_SSC_MODFREQ_DPLL_EXP_SHIFT 7
#define CM_SSC_MODFREQ_DPLL_EXP_MASK GENMASK(10, 8)
struct dpll_params {
u32 m;
u32 n;
s8 m2;
s8 m3;
s8 m4;
s8 m5;
s8 m6;
};
struct dpll_regs {
u32 cm_clkmode_dpll;
u32 cm_idlest_dpll;
u32 cm_autoidle_dpll;
u32 cm_clksel_dpll;
u32 cm_div_m2_dpll;
u32 cm_div_m3_dpll;
u32 cm_div_m4_dpll;
u32 cm_div_m5_dpll;
u32 cm_div_m6_dpll;
};
extern const struct dpll_regs dpll_mpu_regs;
extern const struct dpll_regs dpll_core_regs;
extern const struct dpll_regs dpll_per_regs;
extern const struct dpll_regs dpll_ddr_regs;
extern const struct dpll_regs dpll_disp_regs;
extern const struct dpll_params dpll_mpu_opp[NUM_CRYSTAL_FREQ][NUM_OPPS];
extern const struct dpll_params dpll_core_1000MHz[NUM_CRYSTAL_FREQ];
extern const struct dpll_params dpll_per_192MHz[NUM_CRYSTAL_FREQ];
extern const struct dpll_params dpll_ddr2_266MHz[NUM_CRYSTAL_FREQ];
extern const struct dpll_params dpll_ddr3_303MHz[NUM_CRYSTAL_FREQ];
extern const struct dpll_params dpll_ddr3_400MHz[NUM_CRYSTAL_FREQ];
extern struct cm_wkuppll *const cmwkup;
const struct dpll_params *get_dpll_mpu_params(void);
const struct dpll_params *get_dpll_core_params(void);
const struct dpll_params *get_dpll_per_params(void);
const struct dpll_params *get_dpll_ddr_params(void);
void scale_vcores(void);
void do_setup_dpll(const struct dpll_regs *, const struct dpll_params *);
void prcm_init(void);
void enable_basic_clocks(void);
void rtc_only_update_board_type(u32 btype);
u32 rtc_only_get_board_type(void);
void rtc_only_prcm_init(void);
void rtc_only_enable_basic_clocks(void);
void do_enable_clocks(u32 *const *, u32 *const *, u8);
void do_disable_clocks(u32 *const *, u32 *const *, u8);
void set_mpu_spreadspectrum(int permille);
#endif