u-boot/arch/arm/cpu/armv7/socfpga/clock_manager.c
Chin Liang See ddfeb0aaf4 socfpga: Adding Clock Manager driver
Clock Manager driver will be called to reconfigure all the
clocks setting based on user input. The input are passed to
Preloader through handoff files

Signed-off-by: Chin Liang See <clsee@altera.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Tom Rini <trini@ti.com>
Cc: Wolfgang Denk <wd@denx.de>
CC: Pavel Machek <pavel@denx.de>
Cc: Dinh Nguyen <dinguyen@altera.com>
Acked-by: Pavel Machek <pavel@denx.de>
2014-04-07 10:41:50 +02:00

361 lines
11 KiB
C

/*
* Copyright (C) 2013 Altera Corporation <www.altera.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/clock_manager.h>
static const struct socfpga_clock_manager *clock_manager_base =
(void *)SOCFPGA_CLKMGR_ADDRESS;
#define CLKMGR_BYPASS_ENABLE 1
#define CLKMGR_BYPASS_DISABLE 0
#define CLKMGR_STAT_IDLE 0
#define CLKMGR_STAT_BUSY 1
#define CLKMGR_BYPASS_PERPLLSRC_SELECT_EOSC1 0
#define CLKMGR_BYPASS_PERPLLSRC_SELECT_INPUT_MUX 1
#define CLKMGR_BYPASS_SDRPLLSRC_SELECT_EOSC1 0
#define CLKMGR_BYPASS_SDRPLLSRC_SELECT_INPUT_MUX 1
#define CLEAR_BGP_EN_PWRDN \
(CLKMGR_MAINPLLGRP_VCO_PWRDN_SET(0)| \
CLKMGR_MAINPLLGRP_VCO_EN_SET(0)| \
CLKMGR_MAINPLLGRP_VCO_BGPWRDN_SET(0))
#define VCO_EN_BASE \
(CLKMGR_MAINPLLGRP_VCO_PWRDN_SET(0)| \
CLKMGR_MAINPLLGRP_VCO_EN_SET(1)| \
CLKMGR_MAINPLLGRP_VCO_BGPWRDN_SET(0))
static inline void cm_wait_for_lock(uint32_t mask)
{
register uint32_t inter_val;
do {
inter_val = readl(&clock_manager_base->inter) & mask;
} while (inter_val != mask);
}
/* function to poll in the fsm busy bit */
static inline void cm_wait_for_fsm(void)
{
while (readl(&clock_manager_base->stat) & CLKMGR_STAT_BUSY)
;
}
/*
* function to write the bypass register which requires a poll of the
* busy bit
*/
static inline void cm_write_bypass(uint32_t val)
{
writel(val, &clock_manager_base->bypass);
cm_wait_for_fsm();
}
/* function to write the ctrl register which requires a poll of the busy bit */
static inline void cm_write_ctrl(uint32_t val)
{
writel(val, &clock_manager_base->ctrl);
cm_wait_for_fsm();
}
/* function to write a clock register that has phase information */
static inline void cm_write_with_phase(uint32_t value,
uint32_t reg_address, uint32_t mask)
{
/* poll until phase is zero */
while (readl(reg_address) & mask)
;
writel(value, reg_address);
while (readl(reg_address) & mask)
;
}
/*
* Setup clocks while making no assumptions about previous state of the clocks.
*
* Start by being paranoid and gate all sw managed clocks
* Put all plls in bypass
* Put all plls VCO registers back to reset value (bandgap power down).
* Put peripheral and main pll src to reset value to avoid glitch.
* Delay 5 us.
* Deassert bandgap power down and set numerator and denominator
* Start 7 us timer.
* set internal dividers
* Wait for 7 us timer.
* Enable plls
* Set external dividers while plls are locking
* Wait for pll lock
* Assert/deassert outreset all.
* Take all pll's out of bypass
* Clear safe mode
* set source main and peripheral clocks
* Ungate clocks
*/
void cm_basic_init(const cm_config_t *cfg)
{
uint32_t start, timeout;
/* Start by being paranoid and gate all sw managed clocks */
/*
* We need to disable nandclk
* and then do another apb access before disabling
* gatting off the rest of the periperal clocks.
*/
writel(~CLKMGR_PERPLLGRP_EN_NANDCLK_MASK &
readl(&clock_manager_base->per_pll_en),
&clock_manager_base->per_pll_en);
/* DO NOT GATE OFF DEBUG CLOCKS & BRIDGE CLOCKS */
writel(CLKMGR_MAINPLLGRP_EN_DBGTIMERCLK_MASK |
CLKMGR_MAINPLLGRP_EN_DBGTRACECLK_MASK |
CLKMGR_MAINPLLGRP_EN_DBGCLK_MASK |
CLKMGR_MAINPLLGRP_EN_DBGATCLK_MASK |
CLKMGR_MAINPLLGRP_EN_S2FUSER0CLK_MASK |
CLKMGR_MAINPLLGRP_EN_L4MPCLK_MASK,
&clock_manager_base->main_pll_en);
writel(0, &clock_manager_base->sdr_pll_en);
/* now we can gate off the rest of the peripheral clocks */
writel(0, &clock_manager_base->per_pll_en);
/* Put all plls in bypass */
cm_write_bypass(
CLKMGR_BYPASS_PERPLLSRC_SET(
CLKMGR_BYPASS_PERPLLSRC_SELECT_EOSC1) |
CLKMGR_BYPASS_SDRPLLSRC_SET(
CLKMGR_BYPASS_SDRPLLSRC_SELECT_EOSC1) |
CLKMGR_BYPASS_PERPLL_SET(CLKMGR_BYPASS_ENABLE) |
CLKMGR_BYPASS_SDRPLL_SET(CLKMGR_BYPASS_ENABLE) |
CLKMGR_BYPASS_MAINPLL_SET(CLKMGR_BYPASS_ENABLE));
/*
* Put all plls VCO registers back to reset value.
* Some code might have messed with them.
*/
writel(CLKMGR_MAINPLLGRP_VCO_RESET_VALUE,
&clock_manager_base->main_pll_vco);
writel(CLKMGR_PERPLLGRP_VCO_RESET_VALUE,
&clock_manager_base->per_pll_vco);
writel(CLKMGR_SDRPLLGRP_VCO_RESET_VALUE,
&clock_manager_base->sdr_pll_vco);
/*
* The clocks to the flash devices and the L4_MAIN clocks can
* glitch when coming out of safe mode if their source values
* are different from their reset value. So the trick it to
* put them back to their reset state, and change input
* after exiting safe mode but before ungating the clocks.
*/
writel(CLKMGR_PERPLLGRP_SRC_RESET_VALUE,
&clock_manager_base->per_pll_src);
writel(CLKMGR_MAINPLLGRP_L4SRC_RESET_VALUE,
&clock_manager_base->main_pll_l4src);
/* read back for the required 5 us delay. */
readl(&clock_manager_base->main_pll_vco);
readl(&clock_manager_base->per_pll_vco);
readl(&clock_manager_base->sdr_pll_vco);
/*
* We made sure bgpwr down was assert for 5 us. Now deassert BG PWR DN
* with numerator and denominator.
*/
writel(cfg->main_vco_base | CLEAR_BGP_EN_PWRDN |
CLKMGR_MAINPLLGRP_VCO_REGEXTSEL_MASK,
&clock_manager_base->main_pll_vco);
writel(cfg->peri_vco_base | CLEAR_BGP_EN_PWRDN |
CLKMGR_PERPLLGRP_VCO_REGEXTSEL_MASK,
&clock_manager_base->per_pll_vco);
writel(CLKMGR_SDRPLLGRP_VCO_OUTRESET_SET(0) |
CLKMGR_SDRPLLGRP_VCO_OUTRESETALL_SET(0) |
cfg->sdram_vco_base | CLEAR_BGP_EN_PWRDN |
CLKMGR_SDRPLLGRP_VCO_REGEXTSEL_MASK,
&clock_manager_base->sdr_pll_vco);
/*
* Time starts here
* must wait 7 us from BGPWRDN_SET(0) to VCO_ENABLE_SET(1)
*/
reset_timer();
start = get_timer(0);
/* timeout in unit of us as CONFIG_SYS_HZ = 1000*1000 */
timeout = 7;
/* main mpu */
writel(cfg->mpuclk, &clock_manager_base->main_pll_mpuclk);
/* main main clock */
writel(cfg->mainclk, &clock_manager_base->main_pll_mainclk);
/* main for dbg */
writel(cfg->dbgatclk, &clock_manager_base->main_pll_dbgatclk);
/* main for cfgs2fuser0clk */
writel(cfg->cfg2fuser0clk,
&clock_manager_base->main_pll_cfgs2fuser0clk);
/* Peri emac0 50 MHz default to RMII */
writel(cfg->emac0clk, &clock_manager_base->per_pll_emac0clk);
/* Peri emac1 50 MHz default to RMII */
writel(cfg->emac1clk, &clock_manager_base->per_pll_emac1clk);
/* Peri QSPI */
writel(cfg->mainqspiclk, &clock_manager_base->main_pll_mainqspiclk);
writel(cfg->perqspiclk, &clock_manager_base->per_pll_perqspiclk);
/* Peri pernandsdmmcclk */
writel(cfg->pernandsdmmcclk,
&clock_manager_base->per_pll_pernandsdmmcclk);
/* Peri perbaseclk */
writel(cfg->perbaseclk, &clock_manager_base->per_pll_perbaseclk);
/* Peri s2fuser1clk */
writel(cfg->s2fuser1clk, &clock_manager_base->per_pll_s2fuser1clk);
/* 7 us must have elapsed before we can enable the VCO */
while (get_timer(start) < timeout)
;
/* Enable vco */
/* main pll vco */
writel(cfg->main_vco_base | VCO_EN_BASE,
&clock_manager_base->main_pll_vco);
/* periferal pll */
writel(cfg->peri_vco_base | VCO_EN_BASE,
&clock_manager_base->per_pll_vco);
/* sdram pll vco */
writel(CLKMGR_SDRPLLGRP_VCO_OUTRESET_SET(0) |
CLKMGR_SDRPLLGRP_VCO_OUTRESETALL_SET(0) |
cfg->sdram_vco_base | VCO_EN_BASE,
&clock_manager_base->sdr_pll_vco);
/* L3 MP and L3 SP */
writel(cfg->maindiv, &clock_manager_base->main_pll_maindiv);
writel(cfg->dbgdiv, &clock_manager_base->main_pll_dbgdiv);
writel(cfg->tracediv, &clock_manager_base->main_pll_tracediv);
/* L4 MP, L4 SP, can0, and can1 */
writel(cfg->perdiv, &clock_manager_base->per_pll_div);
writel(cfg->gpiodiv, &clock_manager_base->per_pll_gpiodiv);
#define LOCKED_MASK \
(CLKMGR_INTER_SDRPLLLOCKED_MASK | \
CLKMGR_INTER_PERPLLLOCKED_MASK | \
CLKMGR_INTER_MAINPLLLOCKED_MASK)
cm_wait_for_lock(LOCKED_MASK);
/* write the sdram clock counters before toggling outreset all */
writel(cfg->ddrdqsclk & CLKMGR_SDRPLLGRP_DDRDQSCLK_CNT_MASK,
&clock_manager_base->sdr_pll_ddrdqsclk);
writel(cfg->ddr2xdqsclk & CLKMGR_SDRPLLGRP_DDR2XDQSCLK_CNT_MASK,
&clock_manager_base->sdr_pll_ddr2xdqsclk);
writel(cfg->ddrdqclk & CLKMGR_SDRPLLGRP_DDRDQCLK_CNT_MASK,
&clock_manager_base->sdr_pll_ddrdqclk);
writel(cfg->s2fuser2clk & CLKMGR_SDRPLLGRP_S2FUSER2CLK_CNT_MASK,
&clock_manager_base->sdr_pll_s2fuser2clk);
/*
* after locking, but before taking out of bypass
* assert/deassert outresetall
*/
uint32_t mainvco = readl(&clock_manager_base->main_pll_vco);
/* assert main outresetall */
writel(mainvco | CLKMGR_MAINPLLGRP_VCO_OUTRESETALL_MASK,
&clock_manager_base->main_pll_vco);
uint32_t periphvco = readl(&clock_manager_base->per_pll_vco);
/* assert pheriph outresetall */
writel(periphvco | CLKMGR_PERPLLGRP_VCO_OUTRESETALL_MASK,
&clock_manager_base->per_pll_vco);
/* assert sdram outresetall */
writel(cfg->sdram_vco_base | VCO_EN_BASE|
CLKMGR_SDRPLLGRP_VCO_OUTRESETALL_SET(1),
&clock_manager_base->sdr_pll_vco);
/* deassert main outresetall */
writel(mainvco & ~CLKMGR_MAINPLLGRP_VCO_OUTRESETALL_MASK,
&clock_manager_base->main_pll_vco);
/* deassert pheriph outresetall */
writel(periphvco & ~CLKMGR_PERPLLGRP_VCO_OUTRESETALL_MASK,
&clock_manager_base->per_pll_vco);
/* deassert sdram outresetall */
writel(CLKMGR_SDRPLLGRP_VCO_OUTRESETALL_SET(0) |
cfg->sdram_vco_base | VCO_EN_BASE,
&clock_manager_base->sdr_pll_vco);
/*
* now that we've toggled outreset all, all the clocks
* are aligned nicely; so we can change any phase.
*/
cm_write_with_phase(cfg->ddrdqsclk,
(uint32_t)&clock_manager_base->sdr_pll_ddrdqsclk,
CLKMGR_SDRPLLGRP_DDRDQSCLK_PHASE_MASK);
/* SDRAM DDR2XDQSCLK */
cm_write_with_phase(cfg->ddr2xdqsclk,
(uint32_t)&clock_manager_base->sdr_pll_ddr2xdqsclk,
CLKMGR_SDRPLLGRP_DDR2XDQSCLK_PHASE_MASK);
cm_write_with_phase(cfg->ddrdqclk,
(uint32_t)&clock_manager_base->sdr_pll_ddrdqclk,
CLKMGR_SDRPLLGRP_DDRDQCLK_PHASE_MASK);
cm_write_with_phase(cfg->s2fuser2clk,
(uint32_t)&clock_manager_base->sdr_pll_s2fuser2clk,
CLKMGR_SDRPLLGRP_S2FUSER2CLK_PHASE_MASK);
/* Take all three PLLs out of bypass when safe mode is cleared. */
cm_write_bypass(
CLKMGR_BYPASS_PERPLLSRC_SET(
CLKMGR_BYPASS_PERPLLSRC_SELECT_EOSC1) |
CLKMGR_BYPASS_SDRPLLSRC_SET(
CLKMGR_BYPASS_SDRPLLSRC_SELECT_EOSC1) |
CLKMGR_BYPASS_PERPLL_SET(CLKMGR_BYPASS_DISABLE) |
CLKMGR_BYPASS_SDRPLL_SET(CLKMGR_BYPASS_DISABLE) |
CLKMGR_BYPASS_MAINPLL_SET(CLKMGR_BYPASS_DISABLE));
/* clear safe mode */
cm_write_ctrl(readl(&clock_manager_base->ctrl) |
CLKMGR_CTRL_SAFEMODE_SET(CLKMGR_CTRL_SAFEMODE_MASK));
/*
* now that safe mode is clear with clocks gated
* it safe to change the source mux for the flashes the the L4_MAIN
*/
writel(cfg->persrc, &clock_manager_base->per_pll_src);
writel(cfg->l4src, &clock_manager_base->main_pll_l4src);
/* Now ungate non-hw-managed clocks */
writel(~0, &clock_manager_base->main_pll_en);
writel(~0, &clock_manager_base->per_pll_en);
writel(~0, &clock_manager_base->sdr_pll_en);
}