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ARM:AM33XX: Add clock definitions

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This patch adds basic clock definition of am33xx SoC.

Signed-off-by: Chandan Nath <chandan.nath@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
This commit is contained in:
Chandan Nath 2011-10-14 02:58:23 +00:00 • committed by Albert ARIBAUD
parent 5655108a82
commit f87fa62af9
4 changed files with 353 additions and 0 deletions
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1
arch/arm/cpu/armv7/am33xx/Makefile
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@ -18,6 +18,7 @@ LIB = $(obj)lib$(SOC).o
SOBJS := lowlevel_init.o SOBJS := lowlevel_init.o
COBJS += clock.o
COBJS += sys_info.o COBJS += sys_info.o
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c) SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)

273
arch/arm/cpu/armv7/am33xx/clock.c Normal file
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@ -0,0 +1,273 @@
/*
* clock.c
*
* clocks for AM33XX based boards
*
* Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
* GNU General Public License for more details.
*/
#include <common.h>
#include <asm/arch/cpu.h>
#include <asm/arch/clock.h>
#include <asm/arch/hardware.h>
#include <asm/io.h>
#define PRCM_MOD_EN 0x2
#define PRCM_FORCE_WAKEUP 0x2
#define PRCM_EMIF_CLK_ACTIVITY BIT(2)
#define PRCM_L3_GCLK_ACTIVITY BIT(4)
#define PLL_BYPASS_MODE 0x4
#define ST_MN_BYPASS 0x00000100
#define ST_DPLL_CLK 0x00000001
#define CLK_SEL_MASK 0x7ffff
#define CLK_DIV_MASK 0x1f
#define CLK_DIV2_MASK 0x7f
#define CLK_SEL_SHIFT 0x8
#define CLK_MODE_SEL 0x7
#define CLK_MODE_MASK 0xfffffff8
#define CLK_DIV_SEL 0xFFFFFFE0
const struct cm_perpll *cmper = (struct cm_perpll *)CM_PER;
const struct cm_wkuppll *cmwkup = (struct cm_wkuppll *)CM_WKUP;
const struct cm_dpll *cmdpll = (struct cm_dpll *)CM_DPLL;
static void enable_interface_clocks(void)
{
/* Enable all the Interconnect Modules */
writel(PRCM_MOD_EN, &cmper->l3clkctrl);
while (readl(&cmper->l3clkctrl) != PRCM_MOD_EN)
;
writel(PRCM_MOD_EN, &cmper->l4lsclkctrl);
while (readl(&cmper->l4lsclkctrl) != PRCM_MOD_EN)
;
writel(PRCM_MOD_EN, &cmper->l4fwclkctrl);
while (readl(&cmper->l4fwclkctrl) != PRCM_MOD_EN)
;
writel(PRCM_MOD_EN, &cmwkup->wkl4wkclkctrl);
while (readl(&cmwkup->wkl4wkclkctrl) != PRCM_MOD_EN)
;
writel(PRCM_MOD_EN, &cmper->l3instrclkctrl);
while (readl(&cmper->l3instrclkctrl) != PRCM_MOD_EN)
;
writel(PRCM_MOD_EN, &cmper->l4hsclkctrl);
while (readl(&cmper->l4hsclkctrl) != PRCM_MOD_EN)
;
}
/*
* Force power domain wake up transition
* Ensure that the corresponding interface clock is active before
* using the peripheral
*/
static void power_domain_wkup_transition(void)
{
writel(PRCM_FORCE_WAKEUP, &cmper->l3clkstctrl);
writel(PRCM_FORCE_WAKEUP, &cmper->l4lsclkstctrl);
writel(PRCM_FORCE_WAKEUP, &cmwkup->wkclkstctrl);
writel(PRCM_FORCE_WAKEUP, &cmper->l4fwclkstctrl);
writel(PRCM_FORCE_WAKEUP, &cmper->l3sclkstctrl);
}
/*
* Enable the peripheral clock for required peripherals
*/
static void enable_per_clocks(void)
{
/* Enable the control module though RBL would have done it*/
writel(PRCM_MOD_EN, &cmwkup->wkctrlclkctrl);
while (readl(&cmwkup->wkctrlclkctrl) != PRCM_MOD_EN)
;
/* Enable the module clock */
writel(PRCM_MOD_EN, &cmper->timer2clkctrl);
while (readl(&cmper->timer2clkctrl) != PRCM_MOD_EN)
;
/* UART0 */
writel(PRCM_MOD_EN, &cmwkup->wkup_uart0ctrl);
while (readl(&cmwkup->wkup_uart0ctrl) != PRCM_MOD_EN)
;
}
static void mpu_pll_config(void)
{
u32 clkmode, clksel, div_m2;
clkmode = readl(&cmwkup->clkmoddpllmpu);
clksel = readl(&cmwkup->clkseldpllmpu);
div_m2 = readl(&cmwkup->divm2dpllmpu);
/* Set the PLL to bypass Mode */
writel(PLL_BYPASS_MODE, &cmwkup->clkmoddpllmpu);
while (readl(&cmwkup->idlestdpllmpu) != ST_MN_BYPASS)
;
clksel = clksel & (~CLK_SEL_MASK);
clksel = clksel | ((MPUPLL_M << CLK_SEL_SHIFT) | MPUPLL_N);
writel(clksel, &cmwkup->clkseldpllmpu);
div_m2 = div_m2 & ~CLK_DIV_MASK;
div_m2 = div_m2 | MPUPLL_M2;
writel(div_m2, &cmwkup->divm2dpllmpu);
clkmode = clkmode | CLK_MODE_SEL;
writel(clkmode, &cmwkup->clkmoddpllmpu);
while (readl(&cmwkup->idlestdpllmpu) != ST_DPLL_CLK)
;
}
static void core_pll_config(void)
{
u32 clkmode, clksel, div_m4, div_m5, div_m6;
clkmode = readl(&cmwkup->clkmoddpllcore);
clksel = readl(&cmwkup->clkseldpllcore);
div_m4 = readl(&cmwkup->divm4dpllcore);
div_m5 = readl(&cmwkup->divm5dpllcore);
div_m6 = readl(&cmwkup->divm6dpllcore);
/* Set the PLL to bypass Mode */
writel(PLL_BYPASS_MODE, &cmwkup->clkmoddpllcore);
while (readl(&cmwkup->idlestdpllcore) != ST_MN_BYPASS)
;
clksel = clksel & (~CLK_SEL_MASK);
clksel = clksel | ((COREPLL_M << CLK_SEL_SHIFT) | COREPLL_N);
writel(clksel, &cmwkup->clkseldpllcore);
div_m4 = div_m4 & ~CLK_DIV_MASK;
div_m4 = div_m4 | COREPLL_M4;
writel(div_m4, &cmwkup->divm4dpllcore);
div_m5 = div_m5 & ~CLK_DIV_MASK;
div_m5 = div_m5 | COREPLL_M5;
writel(div_m5, &cmwkup->divm5dpllcore);
div_m6 = div_m6 & ~CLK_DIV_MASK;
div_m6 = div_m6 | COREPLL_M6;
writel(div_m6, &cmwkup->divm6dpllcore);
clkmode = clkmode | CLK_MODE_SEL;
writel(clkmode, &cmwkup->clkmoddpllcore);
while (readl(&cmwkup->idlestdpllcore) != ST_DPLL_CLK)
;
}
static void per_pll_config(void)
{
u32 clkmode, clksel, div_m2;
clkmode = readl(&cmwkup->clkmoddpllper);
clksel = readl(&cmwkup->clkseldpllper);
div_m2 = readl(&cmwkup->divm2dpllper);
/* Set the PLL to bypass Mode */
writel(PLL_BYPASS_MODE, &cmwkup->clkmoddpllper);
while (readl(&cmwkup->idlestdpllper) != ST_MN_BYPASS)
;
clksel = clksel & (~CLK_SEL_MASK);
clksel = clksel | ((PERPLL_M << CLK_SEL_SHIFT) | PERPLL_N);
writel(clksel, &cmwkup->clkseldpllper);
div_m2 = div_m2 & ~CLK_DIV2_MASK;
div_m2 = div_m2 | PERPLL_M2;
writel(div_m2, &cmwkup->divm2dpllper);
clkmode = clkmode | CLK_MODE_SEL;
writel(clkmode, &cmwkup->clkmoddpllper);
while (readl(&cmwkup->idlestdpllper) != ST_DPLL_CLK)
;
}
static void ddr_pll_config(void)
{
u32 clkmode, clksel, div_m2;
clkmode = readl(&cmwkup->clkmoddpllddr);
clksel = readl(&cmwkup->clkseldpllddr);
div_m2 = readl(&cmwkup->divm2dpllddr);
/* Set the PLL to bypass Mode */
clkmode = (clkmode & CLK_MODE_MASK) | PLL_BYPASS_MODE;
writel(clkmode, &cmwkup->clkmoddpllddr);
/* Wait till bypass mode is enabled */
while ((readl(&cmwkup->idlestdpllddr) & ST_MN_BYPASS)
!= ST_MN_BYPASS)
;
clksel = clksel & (~CLK_SEL_MASK);
clksel = clksel | ((DDRPLL_M << CLK_SEL_SHIFT) | DDRPLL_N);
writel(clksel, &cmwkup->clkseldpllddr);
div_m2 = div_m2 & CLK_DIV_SEL;
div_m2 = div_m2 | DDRPLL_M2;
writel(div_m2, &cmwkup->divm2dpllddr);
clkmode = (clkmode & CLK_MODE_MASK) | CLK_MODE_SEL;
writel(clkmode, &cmwkup->clkmoddpllddr);
/* Wait till dpll is locked */
while ((readl(&cmwkup->idlestdpllddr) & ST_DPLL_CLK) != ST_DPLL_CLK)
;
}
void enable_emif_clocks(void)
{
/* Enable the EMIF_FW Functional clock */
writel(PRCM_MOD_EN, &cmper->emiffwclkctrl);
/* Enable EMIF0 Clock */
writel(PRCM_MOD_EN, &cmper->emifclkctrl);
/* Poll for emif_gclk & L3_G clock are active */
while ((readl(&cmper->l3clkstctrl) & (PRCM_EMIF_CLK_ACTIVITY |
PRCM_L3_GCLK_ACTIVITY)) != (PRCM_EMIF_CLK_ACTIVITY |
PRCM_L3_GCLK_ACTIVITY))
;
/* Poll if module is functional */
while ((readl(&cmper->emifclkctrl)) != PRCM_MOD_EN)
;
}
/*
* Configure the PLL/PRCM for necessary peripherals
*/
void pll_init()
{
mpu_pll_config();
core_pll_config();
per_pll_config();
ddr_pll_config();
/* Enable the required interconnect clocks */
enable_interface_clocks();
/* Power domain wake up transition */
power_domain_wkup_transition();
/* Enable the required peripherals */
enable_per_clocks();
}

24
arch/arm/include/asm/arch-am33xx/clock.h Normal file
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@ -0,0 +1,24 @@
/*
* clock.h
*
* clock header
*
* Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _CLOCKS_H_
#define _CLOCKS_H_
#include <asm/arch/clocks_am33xx.h>
#endif

55
arch/arm/include/asm/arch-am33xx/clocks_am33xx.h Normal file
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@ -0,0 +1,55 @@
/*
* clocks_am33xx.h
*
* AM33xx clock define
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _CLOCKS_AM33XX_H_
#define _CLOCKS_AM33XX_H_
#define OSC 24
/* MAIN PLL Fdll = 550 MHZ, */
#define MPUPLL_M 550
#define MPUPLL_N 23
#define MPUPLL_M2 1
/* Core PLL Fdll = 1 GHZ, */
#define COREPLL_M 1000
#define COREPLL_N 23
#define COREPLL_M4 10 /* CORE_CLKOUTM4 = 200 MHZ */
#define COREPLL_M5 8 /* CORE_CLKOUTM5 = 250 MHZ */
#define COREPLL_M6 4 /* CORE_CLKOUTM6 = 500 MHZ */
/*
* USB PHY clock is 960 MHZ. Since, this comes directly from Fdll, Fdll
* frequency needs to be set to 960 MHZ. Hence,
* For clkout = 192 MHZ, Fdll = 960 MHZ, divider values are given below
*/
#define PERPLL_M 960
#define PERPLL_N 23
#define PERPLL_M2 5
/* DDR Freq is 266 MHZ for now */
/* Set Fdll = 400 MHZ , Fdll = M * 2 * CLKINP/ N + 1; clkout = Fdll /(2 * M2) */
#define DDRPLL_M 266
#define DDRPLL_N 23
#define DDRPLL_M2 1
extern void pll_init(void);
extern void enable_emif_clocks(void);
#endif /* endif _CLOCKS_AM33XX_H_ */