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ARM: ux500: Switch to use common clock framework

Browse Source 
Remove machine specific clock implementation and switch to use
new common clock framework.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Ulf Hansson 2012-08-27 15:45:53 +02:00 committed by Mike Turquette
parent 0e6dcde728
commit ebc96db763
6 changed files with 11 additions and 886 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/mach-ux500/Kconfig
View File

@ -11,6 +11,7 @@ config UX500_SOC_COMMON
select CACHE_L2X0
select PINCTRL
select PINCTRL_NOMADIK
select COMMON_CLK
config UX500_SOC_DB8500
bool

2
arch/arm/mach-ux500/Makefile
View File

@ -2,7 +2,7 @@
# Makefile for the linux kernel, U8500 machine.
#
obj-y := clock.o cpu.o devices.o devices-common.o \
obj-y := cpu.o devices.o devices-common.o \
id.o usb.o timer.o
obj-$(CONFIG_CPU_IDLE) += cpuidle.o
obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o

715
arch/arm/mach-ux500/clock.c
View File

@ -1,715 +0,0 @@
/*
* Copyright (C) 2009 ST-Ericsson
* Copyright (C) 2009 STMicroelectronics
*
* 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.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/clkdev.h>
#include <linux/cpufreq.h>
#include <plat/mtu.h>
#include <mach/hardware.h>
#include "clock.h"
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/uaccess.h> /* for copy_from_user */
static LIST_HEAD(clk_list);
#endif
#define PRCC_PCKEN 0x00
#define PRCC_PCKDIS 0x04
#define PRCC_KCKEN 0x08
#define PRCC_KCKDIS 0x0C
#define PRCM_YYCLKEN0_MGT_SET 0x510
#define PRCM_YYCLKEN1_MGT_SET 0x514
#define PRCM_YYCLKEN0_MGT_CLR 0x518
#define PRCM_YYCLKEN1_MGT_CLR 0x51C
#define PRCM_YYCLKEN0_MGT_VAL 0x520
#define PRCM_YYCLKEN1_MGT_VAL 0x524
#define PRCM_SVAMMDSPCLK_MGT 0x008
#define PRCM_SIAMMDSPCLK_MGT 0x00C
#define PRCM_SGACLK_MGT 0x014
#define PRCM_UARTCLK_MGT 0x018
#define PRCM_MSP02CLK_MGT 0x01C
#define PRCM_MSP1CLK_MGT 0x288
#define PRCM_I2CCLK_MGT 0x020
#define PRCM_SDMMCCLK_MGT 0x024
#define PRCM_SLIMCLK_MGT 0x028
#define PRCM_PER1CLK_MGT 0x02C
#define PRCM_PER2CLK_MGT 0x030
#define PRCM_PER3CLK_MGT 0x034
#define PRCM_PER5CLK_MGT 0x038
#define PRCM_PER6CLK_MGT 0x03C
#define PRCM_PER7CLK_MGT 0x040
#define PRCM_LCDCLK_MGT 0x044
#define PRCM_BMLCLK_MGT 0x04C
#define PRCM_HSITXCLK_MGT 0x050
#define PRCM_HSIRXCLK_MGT 0x054
#define PRCM_HDMICLK_MGT 0x058
#define PRCM_APEATCLK_MGT 0x05C
#define PRCM_APETRACECLK_MGT 0x060
#define PRCM_MCDECLK_MGT 0x064
#define PRCM_IPI2CCLK_MGT 0x068
#define PRCM_DSIALTCLK_MGT 0x06C
#define PRCM_DMACLK_MGT 0x074
#define PRCM_B2R2CLK_MGT 0x078
#define PRCM_TVCLK_MGT 0x07C
#define PRCM_TCR 0x1C8
#define PRCM_TCR_STOPPED (1 << 16)
#define PRCM_TCR_DOZE_MODE (1 << 17)
#define PRCM_UNIPROCLK_MGT 0x278
#define PRCM_SSPCLK_MGT 0x280
#define PRCM_RNGCLK_MGT 0x284
#define PRCM_UICCCLK_MGT 0x27C
#define PRCM_MGT_ENABLE (1 << 8)
static DEFINE_SPINLOCK(clocks_lock);
static void __clk_enable(struct clk *clk)
{
if (clk->enabled++ == 0) {
if (clk->parent_cluster)
__clk_enable(clk->parent_cluster);
if (clk->parent_periph)
__clk_enable(clk->parent_periph);
if (clk->ops && clk->ops->enable)
clk->ops->enable(clk);
}
}
int clk_enable(struct clk *clk)
{
unsigned long flags;
spin_lock_irqsave(&clocks_lock, flags);
__clk_enable(clk);
spin_unlock_irqrestore(&clocks_lock, flags);
return 0;
}
EXPORT_SYMBOL(clk_enable);
static void __clk_disable(struct clk *clk)
{
if (--clk->enabled == 0) {
if (clk->ops && clk->ops->disable)
clk->ops->disable(clk);
if (clk->parent_periph)
__clk_disable(clk->parent_periph);
if (clk->parent_cluster)
__clk_disable(clk->parent_cluster);
}
}
void clk_disable(struct clk *clk)
{
unsigned long flags;
WARN_ON(!clk->enabled);
spin_lock_irqsave(&clocks_lock, flags);
__clk_disable(clk);
spin_unlock_irqrestore(&clocks_lock, flags);
}
EXPORT_SYMBOL(clk_disable);
/*
* The MTU has a separate, rather complex muxing setup
* with alternative parents (peripheral cluster or
* ULP or fixed 32768 Hz) depending on settings
*/
static unsigned long clk_mtu_get_rate(struct clk *clk)
{
void __iomem *addr;
u32 tcr;
int mtu = (int) clk->data;
/*
* One of these is selected eventually
* TODO: Replace the constant with a reference
* to the ULP source once this is modeled.
*/
unsigned long clk32k = 32768;
unsigned long mturate;
unsigned long retclk;
if (cpu_is_u8500_family())
addr = __io_address(U8500_PRCMU_BASE);
else
ux500_unknown_soc();
/*
* On a startup, always conifgure the TCR to the doze mode;
* bootloaders do it for us. Do this in the kernel too.
*/
writel(PRCM_TCR_DOZE_MODE, addr + PRCM_TCR);
tcr = readl(addr + PRCM_TCR);
/* Get the rate from the parent as a default */
if (clk->parent_periph)
mturate = clk_get_rate(clk->parent_periph);
else if (clk->parent_cluster)
mturate = clk_get_rate(clk->parent_cluster);
else
/* We need to be connected SOMEWHERE */
BUG();
/* Return the clock selected for this MTU */
if (tcr & (1 << mtu))
retclk = clk32k;
else
retclk = mturate;
pr_info("MTU%d clock rate: %lu Hz\n", mtu, retclk);
return retclk;
}
unsigned long clk_get_rate(struct clk *clk)
{
unsigned long rate;
/*
* If there is a custom getrate callback for this clock,
* it will take precedence.
*/
if (clk->get_rate)
return clk->get_rate(clk);
if (clk->ops && clk->ops->get_rate)
return clk->ops->get_rate(clk);
rate = clk->rate;
if (!rate) {
if (clk->parent_periph)
rate = clk_get_rate(clk->parent_periph);
else if (clk->parent_cluster)
rate = clk_get_rate(clk->parent_cluster);
}
return rate;
}
EXPORT_SYMBOL(clk_get_rate);
long clk_round_rate(struct clk *clk, unsigned long rate)
{
/*TODO*/
return rate;
}
EXPORT_SYMBOL(clk_round_rate);
int clk_set_rate(struct clk *clk, unsigned long rate)
{
clk->rate = rate;
return 0;
}
EXPORT_SYMBOL(clk_set_rate);
int clk_set_parent(struct clk *clk, struct clk *parent)
{
/*TODO*/
return -ENOSYS;
}
EXPORT_SYMBOL(clk_set_parent);
static void clk_prcmu_enable(struct clk *clk)
{
void __iomem *cg_set_reg = __io_address(U8500_PRCMU_BASE)
+ PRCM_YYCLKEN0_MGT_SET + clk->prcmu_cg_off;
writel(1 << clk->prcmu_cg_bit, cg_set_reg);
}
static void clk_prcmu_disable(struct clk *clk)
{
void __iomem *cg_clr_reg = __io_address(U8500_PRCMU_BASE)
+ PRCM_YYCLKEN0_MGT_CLR + clk->prcmu_cg_off;
writel(1 << clk->prcmu_cg_bit, cg_clr_reg);
}
static struct clkops clk_prcmu_ops = {
.enable = clk_prcmu_enable,
.disable = clk_prcmu_disable,
};
static unsigned int clkrst_base[] = {
[1] = U8500_CLKRST1_BASE,
[2] = U8500_CLKRST2_BASE,
[3] = U8500_CLKRST3_BASE,
[5] = U8500_CLKRST5_BASE,
[6] = U8500_CLKRST6_BASE,
};
static void clk_prcc_enable(struct clk *clk)
{
void __iomem *addr = __io_address(clkrst_base[clk->cluster]);
if (clk->prcc_kernel != -1)
writel(1 << clk->prcc_kernel, addr + PRCC_KCKEN);
if (clk->prcc_bus != -1)
writel(1 << clk->prcc_bus, addr + PRCC_PCKEN);
}
static void clk_prcc_disable(struct clk *clk)
{
void __iomem *addr = __io_address(clkrst_base[clk->cluster]);
if (clk->prcc_bus != -1)
writel(1 << clk->prcc_bus, addr + PRCC_PCKDIS);
if (clk->prcc_kernel != -1)
writel(1 << clk->prcc_kernel, addr + PRCC_KCKDIS);
}
static struct clkops clk_prcc_ops = {
.enable = clk_prcc_enable,
.disable = clk_prcc_disable,
};
static struct clk clk_32khz = {
.name = "clk_32khz",
.rate = 32000,
};
/*
* PRCMU level clock gating
*/
/* Bank 0 */
static DEFINE_PRCMU_CLK(svaclk, 0x0, 2, SVAMMDSPCLK);
static DEFINE_PRCMU_CLK(siaclk, 0x0, 3, SIAMMDSPCLK);
static DEFINE_PRCMU_CLK(sgaclk, 0x0, 4, SGACLK);
static DEFINE_PRCMU_CLK_RATE(uartclk, 0x0, 5, UARTCLK, 38400000);
static DEFINE_PRCMU_CLK(msp02clk, 0x0, 6, MSP02CLK);
static DEFINE_PRCMU_CLK(msp1clk, 0x0, 7, MSP1CLK); /* v1 */
static DEFINE_PRCMU_CLK_RATE(i2cclk, 0x0, 8, I2CCLK, 48000000);
static DEFINE_PRCMU_CLK_RATE(sdmmcclk, 0x0, 9, SDMMCCLK, 100000000);
static DEFINE_PRCMU_CLK(slimclk, 0x0, 10, SLIMCLK);
static DEFINE_PRCMU_CLK(per1clk, 0x0, 11, PER1CLK);
static DEFINE_PRCMU_CLK(per2clk, 0x0, 12, PER2CLK);
static DEFINE_PRCMU_CLK(per3clk, 0x0, 13, PER3CLK);
static DEFINE_PRCMU_CLK(per5clk, 0x0, 14, PER5CLK);
static DEFINE_PRCMU_CLK_RATE(per6clk, 0x0, 15, PER6CLK, 133330000);
static DEFINE_PRCMU_CLK(lcdclk, 0x0, 17, LCDCLK);
static DEFINE_PRCMU_CLK(bmlclk, 0x0, 18, BMLCLK);
static DEFINE_PRCMU_CLK(hsitxclk, 0x0, 19, HSITXCLK);
static DEFINE_PRCMU_CLK(hsirxclk, 0x0, 20, HSIRXCLK);
static DEFINE_PRCMU_CLK(hdmiclk, 0x0, 21, HDMICLK);
static DEFINE_PRCMU_CLK(apeatclk, 0x0, 22, APEATCLK);
static DEFINE_PRCMU_CLK(apetraceclk, 0x0, 23, APETRACECLK);
static DEFINE_PRCMU_CLK(mcdeclk, 0x0, 24, MCDECLK);
static DEFINE_PRCMU_CLK(ipi2clk, 0x0, 25, IPI2CCLK);
static DEFINE_PRCMU_CLK(dsialtclk, 0x0, 26, DSIALTCLK); /* v1 */
static DEFINE_PRCMU_CLK(dmaclk, 0x0, 27, DMACLK);
static DEFINE_PRCMU_CLK(b2r2clk, 0x0, 28, B2R2CLK);
static DEFINE_PRCMU_CLK(tvclk, 0x0, 29, TVCLK);
static DEFINE_PRCMU_CLK(uniproclk, 0x0, 30, UNIPROCLK); /* v1 */
static DEFINE_PRCMU_CLK_RATE(sspclk, 0x0, 31, SSPCLK, 48000000); /* v1 */
/* Bank 1 */
static DEFINE_PRCMU_CLK(rngclk, 0x4, 0, RNGCLK); /* v1 */
static DEFINE_PRCMU_CLK(uiccclk, 0x4, 1, UICCCLK); /* v1 */
/*
* PRCC level clock gating
* Format: per#, clk, PCKEN bit, KCKEN bit, parent
*/
/* Peripheral Cluster #1 */
static DEFINE_PRCC_CLK(1, msp3, 11, 10, &clk_msp1clk);
static DEFINE_PRCC_CLK(1, i2c4, 10, 9, &clk_i2cclk);
static DEFINE_PRCC_CLK(1, gpio0, 9, -1, NULL);
static DEFINE_PRCC_CLK(1, slimbus0, 8, 8, &clk_slimclk);
static DEFINE_PRCC_CLK(1, spi3, 7, -1, NULL);
static DEFINE_PRCC_CLK(1, i2c2, 6, 6, &clk_i2cclk);
static DEFINE_PRCC_CLK(1, sdi0, 5, 5, &clk_sdmmcclk);
static DEFINE_PRCC_CLK(1, msp1, 4, 4, &clk_msp1clk);
static DEFINE_PRCC_CLK(1, msp0, 3, 3, &clk_msp02clk);
static DEFINE_PRCC_CLK(1, i2c1, 2, 2, &clk_i2cclk);
static DEFINE_PRCC_CLK(1, uart1, 1, 1, &clk_uartclk);
static DEFINE_PRCC_CLK(1, uart0, 0, 0, &clk_uartclk);
/* Peripheral Cluster #2 */
static DEFINE_PRCC_CLK(2, gpio1, 11, -1, NULL);
static DEFINE_PRCC_CLK(2, ssitx, 10, 7, NULL);
static DEFINE_PRCC_CLK(2, ssirx, 9, 6, NULL);
static DEFINE_PRCC_CLK(2, spi0, 8, -1, NULL);
static DEFINE_PRCC_CLK(2, sdi3, 7, 5, &clk_sdmmcclk);
static DEFINE_PRCC_CLK(2, sdi1, 6, 4, &clk_sdmmcclk);
static DEFINE_PRCC_CLK(2, msp2, 5, 3, &clk_msp02clk);
static DEFINE_PRCC_CLK(2, sdi4, 4, 2, &clk_sdmmcclk);
static DEFINE_PRCC_CLK(2, pwl, 3, 1, NULL);
static DEFINE_PRCC_CLK(2, spi1, 2, -1, NULL);
static DEFINE_PRCC_CLK(2, spi2, 1, -1, NULL);
static DEFINE_PRCC_CLK(2, i2c3, 0, 0, &clk_i2cclk);
/* Peripheral Cluster #3 */
static DEFINE_PRCC_CLK(3, gpio2, 8, -1, NULL);
static DEFINE_PRCC_CLK(3, sdi5, 7, 7, &clk_sdmmcclk);
static DEFINE_PRCC_CLK(3, uart2, 6, 6, &clk_uartclk);
static DEFINE_PRCC_CLK(3, ske, 5, 5, &clk_32khz);
static DEFINE_PRCC_CLK(3, sdi2, 4, 4, &clk_sdmmcclk);
static DEFINE_PRCC_CLK(3, i2c0, 3, 3, &clk_i2cclk);
static DEFINE_PRCC_CLK(3, ssp1, 2, 2, &clk_sspclk);
static DEFINE_PRCC_CLK(3, ssp0, 1, 1, &clk_sspclk);
static DEFINE_PRCC_CLK(3, fsmc, 0, -1, NULL);
/* Peripheral Cluster #4 is in the always on domain */
/* Peripheral Cluster #5 */
static DEFINE_PRCC_CLK(5, gpio3, 1, -1, NULL);
static DEFINE_PRCC_CLK(5, usb, 0, 0, NULL);
/* Peripheral Cluster #6 */
/* MTU ID in data */
static DEFINE_PRCC_CLK_CUSTOM(6, mtu1, 9, -1, NULL, clk_mtu_get_rate, 1);
static DEFINE_PRCC_CLK_CUSTOM(6, mtu0, 8, -1, NULL, clk_mtu_get_rate, 0);
static DEFINE_PRCC_CLK(6, cfgreg, 7, 7, NULL);
static DEFINE_PRCC_CLK(6, hash1, 6, -1, NULL);
static DEFINE_PRCC_CLK(6, unipro, 5, 1, &clk_uniproclk);
static DEFINE_PRCC_CLK(6, pka, 4, -1, NULL);
static DEFINE_PRCC_CLK(6, hash0, 3, -1, NULL);
static DEFINE_PRCC_CLK(6, cryp0, 2, -1, NULL);
static DEFINE_PRCC_CLK(6, cryp1, 1, -1, NULL);
static DEFINE_PRCC_CLK(6, rng, 0, 0, &clk_rngclk);
static struct clk clk_dummy_apb_pclk = {
.name = "apb_pclk",
};
static struct clk_lookup u8500_clks[] = {
CLK(dummy_apb_pclk, NULL, "apb_pclk"),
/* Peripheral Cluster #1 */
CLK(gpio0, "gpio.0", NULL),
CLK(gpio0, "gpio.1", NULL),
CLK(slimbus0, "slimbus0", NULL),
CLK(i2c2, "nmk-i2c.2", NULL),
CLK(sdi0, "sdi0", NULL),
CLK(msp0, "ux500-msp-i2s.0", NULL),
CLK(i2c1, "nmk-i2c.1", NULL),
CLK(uart1, "uart1", NULL),
CLK(uart0, "uart0", NULL),
/* Peripheral Cluster #3 */
CLK(gpio2, "gpio.2", NULL),
CLK(gpio2, "gpio.3", NULL),
CLK(gpio2, "gpio.4", NULL),
CLK(gpio2, "gpio.5", NULL),
CLK(sdi5, "sdi5", NULL),
CLK(uart2, "uart2", NULL),
CLK(ske, "ske", NULL),
CLK(ske, "nmk-ske-keypad", NULL),
CLK(sdi2, "sdi2", NULL),
CLK(i2c0, "nmk-i2c.0", NULL),
CLK(fsmc, "fsmc", NULL),
/* Peripheral Cluster #5 */
CLK(gpio3, "gpio.8", NULL),
/* Peripheral Cluster #6 */
CLK(hash1, "hash1", NULL),
CLK(pka, "pka", NULL),
CLK(hash0, "hash0", NULL),
CLK(cryp0, "cryp0", NULL),
CLK(cryp1, "cryp1", NULL),
/* PRCMU level clock gating */
/* Bank 0 */
CLK(svaclk, "sva", NULL),
CLK(siaclk, "sia", NULL),
CLK(sgaclk, "sga", NULL),
CLK(slimclk, "slim", NULL),
CLK(lcdclk, "lcd", NULL),
CLK(bmlclk, "bml", NULL),
CLK(hsitxclk, "stm-hsi.0", NULL),
CLK(hsirxclk, "stm-hsi.1", NULL),
CLK(hdmiclk, "hdmi", NULL),
CLK(apeatclk, "apeat", NULL),
CLK(apetraceclk, "apetrace", NULL),
CLK(mcdeclk, "mcde", NULL),
CLK(ipi2clk, "ipi2", NULL),
CLK(dmaclk, "dma40.0", NULL),
CLK(b2r2clk, "b2r2", NULL),
CLK(tvclk, "tv", NULL),
/* Peripheral Cluster #1 */
CLK(i2c4, "nmk-i2c.4", NULL),
CLK(spi3, "spi3", NULL),
CLK(msp1, "ux500-msp-i2s.1", NULL),
CLK(msp3, "ux500-msp-i2s.3", NULL),
/* Peripheral Cluster #2 */
CLK(gpio1, "gpio.6", NULL),
CLK(gpio1, "gpio.7", NULL),
CLK(ssitx, "ssitx", NULL),
CLK(ssirx, "ssirx", NULL),
CLK(spi0, "spi0", NULL),
CLK(sdi3, "sdi3", NULL),
CLK(sdi1, "sdi1", NULL),
CLK(msp2, "ux500-msp-i2s.2", NULL),
CLK(sdi4, "sdi4", NULL),
CLK(pwl, "pwl", NULL),
CLK(spi1, "spi1", NULL),
CLK(spi2, "spi2", NULL),
CLK(i2c3, "nmk-i2c.3", NULL),
/* Peripheral Cluster #3 */
CLK(ssp1, "ssp1", NULL),
CLK(ssp0, "ssp0", NULL),
/* Peripheral Cluster #5 */
CLK(usb, "musb-ux500.0", "usb"),
/* Peripheral Cluster #6 */
CLK(mtu1, "mtu1", NULL),
CLK(mtu0, "mtu0", NULL),
CLK(cfgreg, "cfgreg", NULL),
CLK(hash1, "hash1", NULL),
CLK(unipro, "unipro", NULL),
CLK(rng, "rng", NULL),
/* PRCMU level clock gating */
/* Bank 0 */
CLK(uniproclk, "uniproclk", NULL),
CLK(dsialtclk, "dsialt", NULL),
/* Bank 1 */
CLK(rngclk, "rng", NULL),
CLK(uiccclk, "uicc", NULL),
};
#ifdef CONFIG_DEBUG_FS
/*
* debugfs support to trace clock tree hierarchy and attributes with
* powerdebug
*/
static struct dentry *clk_debugfs_root;
void __init clk_debugfs_add_table(struct clk_lookup *cl, size_t num)
{
while (num--) {
/* Check that the clock has not been already registered */
if (!(cl->clk->list.prev != cl->clk->list.next))
list_add_tail(&cl->clk->list, &clk_list);
cl++;
}
}
static ssize_t usecount_dbg_read(struct file *file, char __user *buf,
size_t size, loff_t *off)
{
struct clk *clk = file->f_dentry->d_inode->i_private;
char cusecount[128];
unsigned int len;
len = sprintf(cusecount, "%u\n", clk->enabled);
return simple_read_from_buffer(buf, size, off, cusecount, len);
}
static ssize_t rate_dbg_read(struct file *file, char __user *buf,
size_t size, loff_t *off)
{
struct clk *clk = file->f_dentry->d_inode->i_private;
char crate[128];
unsigned int rate;
unsigned int len;
rate = clk_get_rate(clk);
len = sprintf(crate, "%u\n", rate);
return simple_read_from_buffer(buf, size, off, crate, len);
}
static const struct file_operations usecount_fops = {
.read = usecount_dbg_read,
};
static const struct file_operations set_rate_fops = {
.read = rate_dbg_read,
};
static struct dentry *clk_debugfs_register_dir(struct clk *c,
struct dentry *p_dentry)
{
struct dentry *d, *clk_d;
const char *p = c->name;
if (!p)
p = "BUG";
clk_d = debugfs_create_dir(p, p_dentry);
if (!clk_d)
return NULL;
d = debugfs_create_file("usecount", S_IRUGO,
clk_d, c, &usecount_fops);
if (!d)
goto err_out;
d = debugfs_create_file("rate", S_IRUGO,
clk_d, c, &set_rate_fops);
if (!d)
goto err_out;
/*
* TODO : not currently available in ux500
* d = debugfs_create_x32("flags", S_IRUGO, clk_d, (u32 *)&c->flags);
* if (!d)
* goto err_out;
*/
return clk_d;
err_out:
debugfs_remove_recursive(clk_d);
return NULL;
}
static int clk_debugfs_register_one(struct clk *c)
{
struct clk *pa = c->parent_periph;
struct clk *bpa = c->parent_cluster;
if (!(bpa && !pa)) {
c->dent = clk_debugfs_register_dir(c,
pa ? pa->dent : clk_debugfs_root);
if (!c->dent)
return -ENOMEM;
}
if (bpa) {
c->dent_bus = clk_debugfs_register_dir(c,
bpa->dent_bus ? bpa->dent_bus : bpa->dent);
if ((!c->dent_bus) && (c->dent)) {
debugfs_remove_recursive(c->dent);
c->dent = NULL;
return -ENOMEM;
}
}
return 0;
}
static int clk_debugfs_register(struct clk *c)
{
int err;
struct clk *pa = c->parent_periph;
struct clk *bpa = c->parent_cluster;
if (pa && (!pa->dent && !pa->dent_bus)) {
err = clk_debugfs_register(pa);
if (err)
return err;
}
if (bpa && (!bpa->dent && !bpa->dent_bus)) {
err = clk_debugfs_register(bpa);
if (err)
return err;
}
if ((!c->dent) && (!c->dent_bus)) {
err = clk_debugfs_register_one(c);
if (err)
return err;
}
return 0;
}
int __init clk_debugfs_init(void)
{
struct clk *c;
struct dentry *d;
int err;
d = debugfs_create_dir("clock", NULL);
if (!d)
return -ENOMEM;
clk_debugfs_root = d;
list_for_each_entry(c, &clk_list, list) {
err = clk_debugfs_register(c);
if (err)
goto err_out;
}
return 0;
err_out:
debugfs_remove_recursive(clk_debugfs_root);
return err;
}
#endif /* defined(CONFIG_DEBUG_FS) */
unsigned long clk_smp_twd_rate = 500000000;
unsigned long clk_smp_twd_get_rate(struct clk *clk)
{
return clk_smp_twd_rate;
}
static struct clk clk_smp_twd = {
.get_rate = clk_smp_twd_get_rate,
.name = "smp_twd",
};
static struct clk_lookup clk_smp_twd_lookup = {
.dev_id = "smp_twd",
.clk = &clk_smp_twd,
};
#ifdef CONFIG_CPU_FREQ
static int clk_twd_cpufreq_transition(struct notifier_block *nb,
unsigned long state, void *data)
{
struct cpufreq_freqs *f = data;
if (state == CPUFREQ_PRECHANGE) {
/* Save frequency in simple Hz */
clk_smp_twd_rate = (f->new * 1000) / 2;
}
return NOTIFY_OK;
}
static struct notifier_block clk_twd_cpufreq_nb = {
.notifier_call = clk_twd_cpufreq_transition,
};
int clk_init_smp_twd_cpufreq(void)
{
return cpufreq_register_notifier(&clk_twd_cpufreq_nb,
CPUFREQ_TRANSITION_NOTIFIER);
}
#endif
int __init clk_init(void)
{
clkdev_add_table(u8500_clks, ARRAY_SIZE(u8500_clks));
clkdev_add(&clk_smp_twd_lookup);
#ifdef CONFIG_DEBUG_FS
clk_debugfs_add_table(u8500_clks, ARRAY_SIZE(u8500_clks));
#endif
return 0;
}

164
arch/arm/mach-ux500/clock.h
View File

@ -1,164 +0,0 @@
/*
* Copyright (C) 2010 ST-Ericsson
* Copyright (C) 2009 STMicroelectronics
*
* 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.
*/
/**
* struct clkops - ux500 clock operations
* @enable: function to enable the clock
* @disable: function to disable the clock
* @get_rate: function to get the current clock rate
*
* This structure contains function pointers to functions that will be used to
* control the clock. All of these functions are optional. If get_rate is
* NULL, the rate in the struct clk will be used.
*/
struct clkops {
void (*enable) (struct clk *);
void (*disable) (struct clk *);
unsigned long (*get_rate) (struct clk *);
int (*set_parent)(struct clk *, struct clk *);
};
/**
* struct clk - ux500 clock structure
* @ops: pointer to clkops struct used to control this clock
* @name: name, for debugging
* @enabled: refcount. positive if enabled, zero if disabled
* @get_rate: custom callback for getting the clock rate
* @data: custom per-clock data for example for the get_rate
* callback
* @rate: fixed rate for clocks which don't implement
* ops->getrate
* @prcmu_cg_off: address offset of the combined enable/disable register
* (used on u8500v1)
* @prcmu_cg_bit: bit in the combined enable/disable register (used on
* u8500v1)
* @prcmu_cg_mgt: address of the enable/disable register (used on
* u8500ed)
* @cluster: peripheral cluster number
* @prcc_bus: bit for the bus clock in the peripheral's CLKRST
* @prcc_kernel: bit for the kernel clock in the peripheral's CLKRST.
* -1 if no kernel clock exists.
* @parent_cluster: pointer to parent's cluster clk struct
* @parent_periph: pointer to parent's peripheral clk struct
*
* Peripherals are organised into clusters, and each cluster has an associated
* bus clock. Some peripherals also have a parent peripheral clock.
*
* In order to enable a clock for a peripheral, we need to enable:
* (1) the parent cluster (bus) clock at the PRCMU level
* (2) the parent peripheral clock (if any) at the PRCMU level
* (3) the peripheral's bus & kernel clock at the PRCC level
*
* (1) and (2) are handled by defining clk structs (DEFINE_PRCMU_CLK) for each
* of the cluster and peripheral clocks, and hooking these as the parents of
* the individual peripheral clocks.
*
* (3) is handled by specifying the bits in the PRCC control registers required
* to enable these clocks and modifying them in the ->enable and
* ->disable callbacks of the peripheral clocks (DEFINE_PRCC_CLK).
*
* This structure describes both the PRCMU-level clocks and PRCC-level clocks.
* The prcmu_* fields are only used for the PRCMU clocks, and the cluster,
* prcc, and parent pointers are only used for the PRCC-level clocks.
*/
struct clk {
const struct clkops *ops;
const char *name;
unsigned int enabled;
unsigned long (*get_rate)(struct clk *);
void *data;
unsigned long rate;
struct list_head list;
/* These three are only for PRCMU clks */
unsigned int prcmu_cg_off;
unsigned int prcmu_cg_bit;
unsigned int prcmu_cg_mgt;
/* The rest are only for PRCC clks */
int cluster;
unsigned int prcc_bus;
unsigned int prcc_kernel;
struct clk *parent_cluster;
struct clk *parent_periph;
#if defined(CONFIG_DEBUG_FS)
struct dentry *dent; /* For visible tree hierarchy */
struct dentry *dent_bus; /* For visible tree hierarchy */
#endif
};
#define DEFINE_PRCMU_CLK(_name, _cg_off, _cg_bit, _reg) \
struct clk clk_##_name = { \
.name = #_name, \
.ops = &clk_prcmu_ops, \
.prcmu_cg_off = _cg_off, \
.prcmu_cg_bit = _cg_bit, \
.prcmu_cg_mgt = PRCM_##_reg##_MGT \
}
#define DEFINE_PRCMU_CLK_RATE(_name, _cg_off, _cg_bit, _reg, _rate) \
struct clk clk_##_name = { \
.name = #_name, \
.ops = &clk_prcmu_ops, \
.prcmu_cg_off = _cg_off, \
.prcmu_cg_bit = _cg_bit, \
.rate = _rate, \
.prcmu_cg_mgt = PRCM_##_reg##_MGT \
}
#define DEFINE_PRCC_CLK(_pclust, _name, _bus_en, _kernel_en, _kernclk) \
struct clk clk_##_name = { \
.name = #_name, \
.ops = &clk_prcc_ops, \
.cluster = _pclust, \
.prcc_bus = _bus_en, \
.prcc_kernel = _kernel_en, \
.parent_cluster = &clk_per##_pclust##clk, \
.parent_periph = _kernclk \
}
#define DEFINE_PRCC_CLK_CUSTOM(_pclust, _name, _bus_en, _kernel_en, _kernclk, _callback, _data) \
struct clk clk_##_name = { \
.name = #_name, \
.ops = &clk_prcc_ops, \
.cluster = _pclust, \
.prcc_bus = _bus_en, \
.prcc_kernel = _kernel_en, \
.parent_cluster = &clk_per##_pclust##clk, \
.parent_periph = _kernclk, \
.get_rate = _callback, \
.data = (void *) _data \
}
#define CLK(_clk, _devname, _conname) \
{ \
.clk = &clk_##_clk, \
.dev_id = _devname, \
.con_id = _conname, \
}
int __init clk_db8500_ed_fixup(void);
int __init clk_init(void);
#ifdef CONFIG_DEBUG_FS
int clk_debugfs_init(void);
#else
static inline int clk_debugfs_init(void) { return 0; }
#endif
#ifdef CONFIG_CPU_FREQ
int clk_init_smp_twd_cpufreq(void);
#else
static inline int clk_init_smp_twd_cpufreq(void) { return 0; }
#endif

14
arch/arm/mach-ux500/cpu.c
View File

@ -8,7 +8,6 @@
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/mfd/db8500-prcmu.h>
#include <linux/clksrc-dbx500-prcmu.h>
#include <linux/sys_soc.h>
@ -17,6 +16,7 @@
#include <linux/stat.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/platform_data/clk-ux500.h>
#include <asm/hardware/gic.h>
#include <asm/mach/map.h>
@ -25,8 +25,6 @@
#include <mach/setup.h>
#include <mach/devices.h>
#include "clock.h"
void __iomem *_PRCMU_BASE;
/*
@ -70,13 +68,17 @@ void __init ux500_init_irq(void)
*/
if (cpu_is_u8500_family())
db8500_prcmu_early_init();
clk_init();
if (cpu_is_u8500_family())
u8500_clk_init();
else if (cpu_is_u9540())
u9540_clk_init();
else if (cpu_is_u8540())
u8540_clk_init();
}
void __init ux500_init_late(void)
{
clk_debugfs_init();
clk_init_smp_twd_cpufreq();
}
static const char * __init ux500_get_machine(void)

1
drivers/clk/Makefile
View File

@ -15,6 +15,7 @@ ifeq ($(CONFIG_COMMON_CLK), y)
obj-$(CONFIG_ARCH_MMP) += mmp/
endif
obj-$(CONFIG_MACH_LOONGSON1) += clk-ls1x.o
obj-$(CONFIG_ARCH_U8500) += ux500/
# Chip specific
obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o