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alistair23-linux/arch/arm/plat-omap/clock.c
Tim Schmielau 4e57b68178 [PATCH] fix missing includes 
I recently picked up my older work to remove unnecessary #includes of
sched.h, starting from a patch by Dave Jones to not include sched.h
from module.h. This reduces the number of indirect includes of sched.h
by ~300. Another ~400 pointless direct includes can be removed after
this disentangling (patch to follow later).
However, quite a few indirect includes need to be fixed up for this.

In order to feed the patches through -mm with as little disturbance as
possible, I've split out the fixes I accumulated up to now (complete for
i386 and x86_64, more archs to follow later) and post them before the real
patch.  This way this large part of the patch is kept simple with only
adding #includes, and all hunks are independent of each other.  So if any
hunk rejects or gets in the way of other patches, just drop it.  My scripts
will pick it up again in the next round.

Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 17:37:32 -08:00

1340 lines
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/*
* linux/arch/arm/plat-omap/clock.c
*
* Copyright (C) 2004 Nokia corporation
* Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
*
* 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/string.h>
#include <asm/io.h>
#include <asm/semaphore.h>
#include <asm/hardware/clock.h>
#include <asm/arch/board.h>
#include <asm/arch/usb.h>
#include "clock.h"
#include "sram.h"
static LIST_HEAD(clocks);
static DECLARE_MUTEX(clocks_sem);
static DEFINE_SPINLOCK(clockfw_lock);
static void propagate_rate(struct clk * clk);
/* UART clock function */
static int set_uart_rate(struct clk * clk, unsigned long rate);
/* External clock (MCLK & BCLK) functions */
static int set_ext_clk_rate(struct clk * clk, unsigned long rate);
static long round_ext_clk_rate(struct clk * clk, unsigned long rate);
static void init_ext_clk(struct clk * clk);
/* MPU virtual clock functions */
static int select_table_rate(struct clk * clk, unsigned long rate);
static long round_to_table_rate(struct clk * clk, unsigned long rate);
void clk_setdpll(__u16, __u16);
static struct mpu_rate rate_table[] = {
/* MPU MHz, xtal MHz, dpll1 MHz, CKCTL, DPLL_CTL
* armdiv, dspdiv, dspmmu, tcdiv, perdiv, lcddiv
*/
#if defined(CONFIG_OMAP_ARM_216MHZ)
{ 216000000, 12000000, 216000000, 0x050d, 0x2910 }, /* 1/1/2/2/2/8 */
#endif
#if defined(CONFIG_OMAP_ARM_195MHZ)
{ 195000000, 13000000, 195000000, 0x050e, 0x2790 }, /* 1/1/2/2/4/8 */
#endif
#if defined(CONFIG_OMAP_ARM_192MHZ)
{ 192000000, 19200000, 192000000, 0x050f, 0x2510 }, /* 1/1/2/2/8/8 */
{ 192000000, 12000000, 192000000, 0x050f, 0x2810 }, /* 1/1/2/2/8/8 */
{ 96000000, 12000000, 192000000, 0x055f, 0x2810 }, /* 2/2/2/2/8/8 */
{ 48000000, 12000000, 192000000, 0x0baf, 0x2810 }, /* 4/8/4/4/8/8 */
{ 24000000, 12000000, 192000000, 0x0fff, 0x2810 }, /* 8/8/8/8/8/8 */
#endif
#if defined(CONFIG_OMAP_ARM_182MHZ)
{ 182000000, 13000000, 182000000, 0x050e, 0x2710 }, /* 1/1/2/2/4/8 */
#endif
#if defined(CONFIG_OMAP_ARM_168MHZ)
{ 168000000, 12000000, 168000000, 0x010f, 0x2710 }, /* 1/1/1/2/8/8 */
#endif
#if defined(CONFIG_OMAP_ARM_150MHZ)
{ 150000000, 12000000, 150000000, 0x010a, 0x2cb0 }, /* 1/1/1/2/4/4 */
#endif
#if defined(CONFIG_OMAP_ARM_120MHZ)
{ 120000000, 12000000, 120000000, 0x010a, 0x2510 }, /* 1/1/1/2/4/4 */
#endif
#if defined(CONFIG_OMAP_ARM_96MHZ)
{ 96000000, 12000000, 96000000, 0x0005, 0x2410 }, /* 1/1/1/1/2/2 */
#endif
#if defined(CONFIG_OMAP_ARM_60MHZ)
{ 60000000, 12000000, 60000000, 0x0005, 0x2290 }, /* 1/1/1/1/2/2 */
#endif
#if defined(CONFIG_OMAP_ARM_30MHZ)
{ 30000000, 12000000, 60000000, 0x0555, 0x2290 }, /* 2/2/2/2/2/2 */
#endif
{ 0, 0, 0, 0, 0 },
};
static void ckctl_recalc(struct clk * clk);
int __clk_enable(struct clk *clk);
void __clk_disable(struct clk *clk);
void __clk_unuse(struct clk *clk);
int __clk_use(struct clk *clk);
static void followparent_recalc(struct clk * clk)
{
clk->rate = clk->parent->rate;
}
static void watchdog_recalc(struct clk * clk)
{
clk->rate = clk->parent->rate / 14;
}
static void uart_recalc(struct clk * clk)
{
unsigned int val = omap_readl(clk->enable_reg);
if (val & clk->enable_bit)
clk->rate = 48000000;
else
clk->rate = 12000000;
}
static struct clk ck_ref = {
.name = "ck_ref",
.rate = 12000000,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
ALWAYS_ENABLED,
};
static struct clk ck_dpll1 = {
.name = "ck_dpll1",
.parent = &ck_ref,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
RATE_PROPAGATES | ALWAYS_ENABLED,
};
static struct clk ck_dpll1out = {
.name = "ck_dpll1out",
.parent = &ck_dpll1,
.flags = CLOCK_IN_OMAP16XX,
.enable_reg = ARM_IDLECT2,
.enable_bit = EN_CKOUT_ARM,
.recalc = &followparent_recalc,
};
static struct clk arm_ck = {
.name = "arm_ck",
.parent = &ck_dpll1,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
RATE_CKCTL | RATE_PROPAGATES | ALWAYS_ENABLED,
.rate_offset = CKCTL_ARMDIV_OFFSET,
.recalc = &ckctl_recalc,
};
static struct clk armper_ck = {
.name = "armper_ck",
.parent = &ck_dpll1,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
RATE_CKCTL,
.enable_reg = ARM_IDLECT2,
.enable_bit = EN_PERCK,
.rate_offset = CKCTL_PERDIV_OFFSET,
.recalc = &ckctl_recalc,
};
static struct clk arm_gpio_ck = {
.name = "arm_gpio_ck",
.parent = &ck_dpll1,
.flags = CLOCK_IN_OMAP1510,
.enable_reg = ARM_IDLECT2,
.enable_bit = EN_GPIOCK,
.recalc = &followparent_recalc,
};
static struct clk armxor_ck = {
.name = "armxor_ck",
.parent = &ck_ref,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
.enable_reg = ARM_IDLECT2,
.enable_bit = EN_XORPCK,
.recalc = &followparent_recalc,
};
static struct clk armtim_ck = {
.name = "armtim_ck",
.parent = &ck_ref,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
.enable_reg = ARM_IDLECT2,
.enable_bit = EN_TIMCK,
.recalc = &followparent_recalc,
};
static struct clk armwdt_ck = {
.name = "armwdt_ck",
.parent = &ck_ref,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
.enable_reg = ARM_IDLECT2,
.enable_bit = EN_WDTCK,
.recalc = &watchdog_recalc,
};
static struct clk arminth_ck16xx = {
.name = "arminth_ck",
.parent = &arm_ck,
.flags = CLOCK_IN_OMAP16XX | ALWAYS_ENABLED,
.recalc = &followparent_recalc,
/* Note: On 16xx the frequency can be divided by 2 by programming
* ARM_CKCTL:ARM_INTHCK_SEL(14) to 1
*
* 1510 version is in TC clocks.
*/
};
static struct clk dsp_ck = {
.name = "dsp_ck",
.parent = &ck_dpll1,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
RATE_CKCTL,
.enable_reg = ARM_CKCTL,
.enable_bit = EN_DSPCK,
.rate_offset = CKCTL_DSPDIV_OFFSET,
.recalc = &ckctl_recalc,
};
static struct clk dspmmu_ck = {
.name = "dspmmu_ck",
.parent = &ck_dpll1,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
RATE_CKCTL | ALWAYS_ENABLED,
.rate_offset = CKCTL_DSPMMUDIV_OFFSET,
.recalc = &ckctl_recalc,
};
static struct clk dspper_ck = {
.name = "dspper_ck",
.parent = &ck_dpll1,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
RATE_CKCTL | DSP_DOMAIN_CLOCK | VIRTUAL_IO_ADDRESS,
.enable_reg = DSP_IDLECT2,
.enable_bit = EN_PERCK,
.rate_offset = CKCTL_PERDIV_OFFSET,
.recalc = &followparent_recalc,
//.recalc = &ckctl_recalc,
};
static struct clk dspxor_ck = {
.name = "dspxor_ck",
.parent = &ck_ref,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
DSP_DOMAIN_CLOCK | VIRTUAL_IO_ADDRESS,
.enable_reg = DSP_IDLECT2,
.enable_bit = EN_XORPCK,
.recalc = &followparent_recalc,
};
static struct clk dsptim_ck = {
.name = "dsptim_ck",
.parent = &ck_ref,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
DSP_DOMAIN_CLOCK | VIRTUAL_IO_ADDRESS,
.enable_reg = DSP_IDLECT2,
.enable_bit = EN_DSPTIMCK,
.recalc = &followparent_recalc,
};
static struct clk tc_ck = {
.name = "tc_ck",
.parent = &ck_dpll1,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | CLOCK_IN_OMAP730 |
RATE_CKCTL | RATE_PROPAGATES | ALWAYS_ENABLED,
.rate_offset = CKCTL_TCDIV_OFFSET,
.recalc = &ckctl_recalc,
};
static struct clk arminth_ck1510 = {
.name = "arminth_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP1510 | ALWAYS_ENABLED,
.recalc = &followparent_recalc,
/* Note: On 1510 the frequency follows TC_CK
*
* 16xx version is in MPU clocks.
*/
};
static struct clk tipb_ck = {
.name = "tibp_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP1510 | ALWAYS_ENABLED,
.recalc = &followparent_recalc,
};
static struct clk l3_ocpi_ck = {
.name = "l3_ocpi_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP16XX,
.enable_reg = ARM_IDLECT3,
.enable_bit = EN_OCPI_CK,
.recalc = &followparent_recalc,
};
static struct clk tc1_ck = {
.name = "tc1_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP16XX,
.enable_reg = ARM_IDLECT3,
.enable_bit = EN_TC1_CK,
.recalc = &followparent_recalc,
};
static struct clk tc2_ck = {
.name = "tc2_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP16XX,
.enable_reg = ARM_IDLECT3,
.enable_bit = EN_TC2_CK,
.recalc = &followparent_recalc,
};
static struct clk dma_ck = {
.name = "dma_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
ALWAYS_ENABLED,
.recalc = &followparent_recalc,
};
static struct clk dma_lcdfree_ck = {
.name = "dma_lcdfree_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP16XX | ALWAYS_ENABLED,
.recalc = &followparent_recalc,
};
static struct clk api_ck = {
.name = "api_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
.enable_reg = ARM_IDLECT2,
.enable_bit = EN_APICK,
.recalc = &followparent_recalc,
};
static struct clk lb_ck = {
.name = "lb_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP1510,
.enable_reg = ARM_IDLECT2,
.enable_bit = EN_LBCK,
.recalc = &followparent_recalc,
};
static struct clk rhea1_ck = {
.name = "rhea1_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP16XX | ALWAYS_ENABLED,
.recalc = &followparent_recalc,
};
static struct clk rhea2_ck = {
.name = "rhea2_ck",
.parent = &tc_ck,
.flags = CLOCK_IN_OMAP16XX | ALWAYS_ENABLED,
.recalc = &followparent_recalc,
};
static struct clk lcd_ck = {
.name = "lcd_ck",
.parent = &ck_dpll1,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | CLOCK_IN_OMAP730 |
RATE_CKCTL,
.enable_reg = ARM_IDLECT2,
.enable_bit = EN_LCDCK,
.rate_offset = CKCTL_LCDDIV_OFFSET,
.recalc = &ckctl_recalc,
};
static struct clk uart1_1510 = {
.name = "uart1_ck",
/* Direct from ULPD, no parent */
.rate = 12000000,
.flags = CLOCK_IN_OMAP1510 | ENABLE_REG_32BIT | ALWAYS_ENABLED,
.enable_reg = MOD_CONF_CTRL_0,
.enable_bit = 29, /* Chooses between 12MHz and 48MHz */
.set_rate = &set_uart_rate,
.recalc = &uart_recalc,
};
static struct clk uart1_16xx = {
.name = "uart1_ck",
/* Direct from ULPD, no parent */
.rate = 48000000,
.flags = CLOCK_IN_OMAP16XX | RATE_FIXED | ENABLE_REG_32BIT,
.enable_reg = MOD_CONF_CTRL_0,
.enable_bit = 29,
};
static struct clk uart2_ck = {
.name = "uart2_ck",
/* Direct from ULPD, no parent */
.rate = 12000000,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | ENABLE_REG_32BIT |
ALWAYS_ENABLED,
.enable_reg = MOD_CONF_CTRL_0,
.enable_bit = 30, /* Chooses between 12MHz and 48MHz */
.set_rate = &set_uart_rate,
.recalc = &uart_recalc,
};
static struct clk uart3_1510 = {
.name = "uart3_ck",
/* Direct from ULPD, no parent */
.rate = 12000000,
.flags = CLOCK_IN_OMAP1510 | ENABLE_REG_32BIT | ALWAYS_ENABLED,
.enable_reg = MOD_CONF_CTRL_0,
.enable_bit = 31, /* Chooses between 12MHz and 48MHz */
.set_rate = &set_uart_rate,
.recalc = &uart_recalc,
};
static struct clk uart3_16xx = {
.name = "uart3_ck",
/* Direct from ULPD, no parent */
.rate = 48000000,
.flags = CLOCK_IN_OMAP16XX | RATE_FIXED | ENABLE_REG_32BIT,
.enable_reg = MOD_CONF_CTRL_0,
.enable_bit = 31,
};
static struct clk usb_clko = { /* 6 MHz output on W4_USB_CLKO */
.name = "usb_clko",
/* Direct from ULPD, no parent */
.rate = 6000000,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
RATE_FIXED | ENABLE_REG_32BIT,
.enable_reg = ULPD_CLOCK_CTRL,
.enable_bit = USB_MCLK_EN_BIT,
};
static struct clk usb_hhc_ck1510 = {
.name = "usb_hhc_ck",
/* Direct from ULPD, no parent */
.rate = 48000000, /* Actually 2 clocks, 12MHz and 48MHz */
.flags = CLOCK_IN_OMAP1510 |
RATE_FIXED | ENABLE_REG_32BIT,
.enable_reg = MOD_CONF_CTRL_0,
.enable_bit = USB_HOST_HHC_UHOST_EN,
};
static struct clk usb_hhc_ck16xx = {
.name = "usb_hhc_ck",
/* Direct from ULPD, no parent */
.rate = 48000000,
/* OTG_SYSCON_2.OTG_PADEN == 0 (not 1510-compatible) */
.flags = CLOCK_IN_OMAP16XX |
RATE_FIXED | ENABLE_REG_32BIT,
.enable_reg = OTG_BASE + 0x08 /* OTG_SYSCON_2 */,
.enable_bit = 8 /* UHOST_EN */,
};
static struct clk usb_dc_ck = {
.name = "usb_dc_ck",
/* Direct from ULPD, no parent */
.rate = 48000000,
.flags = CLOCK_IN_OMAP16XX | RATE_FIXED,
.enable_reg = SOFT_REQ_REG,
.enable_bit = 4,
};
static struct clk mclk_1510 = {
.name = "mclk",
/* Direct from ULPD, no parent. May be enabled by ext hardware. */
.rate = 12000000,
.flags = CLOCK_IN_OMAP1510 | RATE_FIXED,
};
static struct clk mclk_16xx = {
.name = "mclk",
/* Direct from ULPD, no parent. May be enabled by ext hardware. */
.flags = CLOCK_IN_OMAP16XX,
.enable_reg = COM_CLK_DIV_CTRL_SEL,
.enable_bit = COM_ULPD_PLL_CLK_REQ,
.set_rate = &set_ext_clk_rate,
.round_rate = &round_ext_clk_rate,
.init = &init_ext_clk,
};
static struct clk bclk_1510 = {
.name = "bclk",
/* Direct from ULPD, no parent. May be enabled by ext hardware. */
.rate = 12000000,
.flags = CLOCK_IN_OMAP1510 | RATE_FIXED,
};
static struct clk bclk_16xx = {
.name = "bclk",
/* Direct from ULPD, no parent. May be enabled by ext hardware. */
.flags = CLOCK_IN_OMAP16XX,
.enable_reg = SWD_CLK_DIV_CTRL_SEL,
.enable_bit = SWD_ULPD_PLL_CLK_REQ,
.set_rate = &set_ext_clk_rate,
.round_rate = &round_ext_clk_rate,
.init = &init_ext_clk,
};
static struct clk mmc1_ck = {
.name = "mmc1_ck",
/* Functional clock is direct from ULPD, interface clock is ARMPER */
.parent = &armper_ck,
.rate = 48000000,
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
RATE_FIXED | ENABLE_REG_32BIT,
.enable_reg = MOD_CONF_CTRL_0,
.enable_bit = 23,
};
static struct clk mmc2_ck = {
.name = "mmc2_ck",
/* Functional clock is direct from ULPD, interface clock is ARMPER */
.parent = &armper_ck,
.rate = 48000000,
.flags = CLOCK_IN_OMAP16XX |
RATE_FIXED | ENABLE_REG_32BIT,
.enable_reg = MOD_CONF_CTRL_0,
.enable_bit = 20,
};
static struct clk virtual_ck_mpu = {
.name = "mpu",
.flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
VIRTUAL_CLOCK | ALWAYS_ENABLED,
.parent = &arm_ck, /* Is smarter alias for */
.recalc = &followparent_recalc,
.set_rate = &select_table_rate,
.round_rate = &round_to_table_rate,
};
static struct clk * onchip_clks[] = {
/* non-ULPD clocks */
&ck_ref,
&ck_dpll1,
/* CK_GEN1 clocks */
&ck_dpll1out,
&arm_ck,
&armper_ck,
&arm_gpio_ck,
&armxor_ck,
&armtim_ck,
&armwdt_ck,
&arminth_ck1510, &arminth_ck16xx,
/* CK_GEN2 clocks */
&dsp_ck,
&dspmmu_ck,
&dspper_ck,
&dspxor_ck,
&dsptim_ck,
/* CK_GEN3 clocks */
&tc_ck,
&tipb_ck,
&l3_ocpi_ck,
&tc1_ck,
&tc2_ck,
&dma_ck,
&dma_lcdfree_ck,
&api_ck,
&lb_ck,
&rhea1_ck,
&rhea2_ck,
&lcd_ck,
/* ULPD clocks */
&uart1_1510,
&uart1_16xx,
&uart2_ck,
&uart3_1510,
&uart3_16xx,
&usb_clko,
&usb_hhc_ck1510, &usb_hhc_ck16xx,
&usb_dc_ck,
&mclk_1510, &mclk_16xx,
&bclk_1510, &bclk_16xx,
&mmc1_ck,
&mmc2_ck,
/* Virtual clocks */
&virtual_ck_mpu,
};
struct clk *clk_get(struct device *dev, const char *id)
{
struct clk *p, *clk = ERR_PTR(-ENOENT);
down(&clocks_sem);
list_for_each_entry(p, &clocks, node) {
if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
clk = p;
break;
}
}
up(&clocks_sem);
return clk;
}
EXPORT_SYMBOL(clk_get);
void clk_put(struct clk *clk)
{
if (clk && !IS_ERR(clk))
module_put(clk->owner);
}
EXPORT_SYMBOL(clk_put);
int __clk_enable(struct clk *clk)
{
__u16 regval16;
__u32 regval32;
if (clk->flags & ALWAYS_ENABLED)
return 0;
if (unlikely(clk->enable_reg == 0)) {
printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
clk->name);
return 0;
}
if (clk->flags & DSP_DOMAIN_CLOCK) {
__clk_use(&api_ck);
}
if (clk->flags & ENABLE_REG_32BIT) {
if (clk->flags & VIRTUAL_IO_ADDRESS) {
regval32 = __raw_readl(clk->enable_reg);
regval32 |= (1 << clk->enable_bit);
__raw_writel(regval32, clk->enable_reg);
} else {
regval32 = omap_readl(clk->enable_reg);
regval32 |= (1 << clk->enable_bit);
omap_writel(regval32, clk->enable_reg);
}
} else {
if (clk->flags & VIRTUAL_IO_ADDRESS) {
regval16 = __raw_readw(clk->enable_reg);
regval16 |= (1 << clk->enable_bit);
__raw_writew(regval16, clk->enable_reg);
} else {
regval16 = omap_readw(clk->enable_reg);
regval16 |= (1 << clk->enable_bit);
omap_writew(regval16, clk->enable_reg);
}
}
if (clk->flags & DSP_DOMAIN_CLOCK) {
__clk_unuse(&api_ck);
}
return 0;
}
void __clk_disable(struct clk *clk)
{
__u16 regval16;
__u32 regval32;
if (clk->enable_reg == 0)
return;
if (clk->flags & DSP_DOMAIN_CLOCK) {
__clk_use(&api_ck);
}
if (clk->flags & ENABLE_REG_32BIT) {
if (clk->flags & VIRTUAL_IO_ADDRESS) {
regval32 = __raw_readl(clk->enable_reg);
regval32 &= ~(1 << clk->enable_bit);
__raw_writel(regval32, clk->enable_reg);
} else {
regval32 = omap_readl(clk->enable_reg);
regval32 &= ~(1 << clk->enable_bit);
omap_writel(regval32, clk->enable_reg);
}
} else {
if (clk->flags & VIRTUAL_IO_ADDRESS) {
regval16 = __raw_readw(clk->enable_reg);
regval16 &= ~(1 << clk->enable_bit);
__raw_writew(regval16, clk->enable_reg);
} else {
regval16 = omap_readw(clk->enable_reg);
regval16 &= ~(1 << clk->enable_bit);
omap_writew(regval16, clk->enable_reg);
}
}
if (clk->flags & DSP_DOMAIN_CLOCK) {
__clk_unuse(&api_ck);
}
}
void __clk_unuse(struct clk *clk)
{
if (clk->usecount > 0 && !(--clk->usecount)) {
__clk_disable(clk);
if (likely(clk->parent))
__clk_unuse(clk->parent);
}
}
int __clk_use(struct clk *clk)
{
int ret = 0;
if (clk->usecount++ == 0) {
if (likely(clk->parent))
ret = __clk_use(clk->parent);
if (unlikely(ret != 0)) {
clk->usecount--;
return ret;
}
ret = __clk_enable(clk);
if (unlikely(ret != 0) && clk->parent) {
__clk_unuse(clk->parent);
clk->usecount--;
}
}
return ret;
}
int clk_enable(struct clk *clk)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&clockfw_lock, flags);
ret = __clk_enable(clk);
spin_unlock_irqrestore(&clockfw_lock, flags);
return ret;
}
EXPORT_SYMBOL(clk_enable);
void clk_disable(struct clk *clk)
{
unsigned long flags;
spin_lock_irqsave(&clockfw_lock, flags);
__clk_disable(clk);
spin_unlock_irqrestore(&clockfw_lock, flags);
}
EXPORT_SYMBOL(clk_disable);
int clk_use(struct clk *clk)
{
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&clockfw_lock, flags);
ret = __clk_use(clk);
spin_unlock_irqrestore(&clockfw_lock, flags);
return ret;
}
EXPORT_SYMBOL(clk_use);
void clk_unuse(struct clk *clk)
{
unsigned long flags;
spin_lock_irqsave(&clockfw_lock, flags);
__clk_unuse(clk);
spin_unlock_irqrestore(&clockfw_lock, flags);
}
EXPORT_SYMBOL(clk_unuse);
int clk_get_usecount(struct clk *clk)
{
return clk->usecount;
}
EXPORT_SYMBOL(clk_get_usecount);
unsigned long clk_get_rate(struct clk *clk)
{
return clk->rate;
}
EXPORT_SYMBOL(clk_get_rate);
static __u16 verify_ckctl_value(__u16 newval)
{
/* This function checks for following limitations set
* by the hardware (all conditions must be true):
* DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2
* ARM_CK >= TC_CK
* DSP_CK >= TC_CK
* DSPMMU_CK >= TC_CK
*
* In addition following rules are enforced:
* LCD_CK <= TC_CK
* ARMPER_CK <= TC_CK
*
* However, maximum frequencies are not checked for!
*/
__u8 per_exp;
__u8 lcd_exp;
__u8 arm_exp;
__u8 dsp_exp;
__u8 tc_exp;
__u8 dspmmu_exp;
per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
if (dspmmu_exp < dsp_exp)
dspmmu_exp = dsp_exp;
if (dspmmu_exp > dsp_exp+1)
dspmmu_exp = dsp_exp+1;
if (tc_exp < arm_exp)
tc_exp = arm_exp;
if (tc_exp < dspmmu_exp)
tc_exp = dspmmu_exp;
if (tc_exp > lcd_exp)
lcd_exp = tc_exp;
if (tc_exp > per_exp)
per_exp = tc_exp;
newval &= 0xf000;
newval |= per_exp << CKCTL_PERDIV_OFFSET;
newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
newval |= tc_exp << CKCTL_TCDIV_OFFSET;
newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
return newval;
}
static int calc_dsor_exp(struct clk *clk, unsigned long rate)
{
/* Note: If target frequency is too low, this function will return 4,
* which is invalid value. Caller must check for this value and act
* accordingly.
*
* Note: This function does not check for following limitations set
* by the hardware (all conditions must be true):
* DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2
* ARM_CK >= TC_CK
* DSP_CK >= TC_CK
* DSPMMU_CK >= TC_CK
*/
unsigned long realrate;
struct clk * parent;
unsigned dsor_exp;
if (unlikely(!(clk->flags & RATE_CKCTL)))
return -EINVAL;
parent = clk->parent;
if (unlikely(parent == 0))
return -EIO;
realrate = parent->rate;
for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
if (realrate <= rate)
break;
realrate /= 2;
}
return dsor_exp;
}
static void ckctl_recalc(struct clk * clk)
{
int dsor;
/* Calculate divisor encoded as 2-bit exponent */
if (clk->flags & DSP_DOMAIN_CLOCK) {
/* The clock control bits are in DSP domain,
* so api_ck is needed for access.
* Note that DSP_CKCTL virt addr = phys addr, so
* we must use __raw_readw() instead of omap_readw().
*/
__clk_use(&api_ck);
dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
__clk_unuse(&api_ck);
} else {
dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
}
if (unlikely(clk->rate == clk->parent->rate / dsor))
return; /* No change, quick exit */
clk->rate = clk->parent->rate / dsor;
if (unlikely(clk->flags & RATE_PROPAGATES))
propagate_rate(clk);
}
long clk_round_rate(struct clk *clk, unsigned long rate)
{
int dsor_exp;
if (clk->flags & RATE_FIXED)
return clk->rate;
if (clk->flags & RATE_CKCTL) {
dsor_exp = calc_dsor_exp(clk, rate);
if (dsor_exp < 0)
return dsor_exp;
if (dsor_exp > 3)
dsor_exp = 3;
return clk->parent->rate / (1 << dsor_exp);
}
if(clk->round_rate != 0)
return clk->round_rate(clk, rate);
return clk->rate;
}
EXPORT_SYMBOL(clk_round_rate);
static void propagate_rate(struct clk * clk)
{
struct clk ** clkp;
for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
if (likely((*clkp)->parent != clk)) continue;
if (likely((*clkp)->recalc))
(*clkp)->recalc(*clkp);
}
}
static int select_table_rate(struct clk * clk, unsigned long rate)
{
/* Find the highest supported frequency <= rate and switch to it */
struct mpu_rate * ptr;
if (clk != &virtual_ck_mpu)
return -EINVAL;
for (ptr = rate_table; ptr->rate; ptr++) {
if (ptr->xtal != ck_ref.rate)
continue;
/* DPLL1 cannot be reprogrammed without risking system crash */
if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
continue;
/* Can check only after xtal frequency check */
if (ptr->rate <= rate)
break;
}
if (!ptr->rate)
return -EINVAL;
/*
* In most cases we should not need to reprogram DPLL.
* Reprogramming the DPLL is tricky, it must be done from SRAM.
*/
omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
ck_dpll1.rate = ptr->pll_rate;
propagate_rate(&ck_dpll1);
return 0;
}
static long round_to_table_rate(struct clk * clk, unsigned long rate)
{
/* Find the highest supported frequency <= rate */
struct mpu_rate * ptr;
long highest_rate;
if (clk != &virtual_ck_mpu)
return -EINVAL;
highest_rate = -EINVAL;
for (ptr = rate_table; ptr->rate; ptr++) {
if (ptr->xtal != ck_ref.rate)
continue;
highest_rate = ptr->rate;
/* Can check only after xtal frequency check */
if (ptr->rate <= rate)
break;
}
return highest_rate;
}
int clk_set_rate(struct clk *clk, unsigned long rate)
{
int ret = -EINVAL;
int dsor_exp;
__u16 regval;
unsigned long flags;
if (clk->flags & RATE_CKCTL) {
dsor_exp = calc_dsor_exp(clk, rate);
if (dsor_exp > 3)
dsor_exp = -EINVAL;
if (dsor_exp < 0)
return dsor_exp;
spin_lock_irqsave(&clockfw_lock, flags);
regval = omap_readw(ARM_CKCTL);
regval &= ~(3 << clk->rate_offset);
regval |= dsor_exp << clk->rate_offset;
regval = verify_ckctl_value(regval);
omap_writew(regval, ARM_CKCTL);
clk->rate = clk->parent->rate / (1 << dsor_exp);
spin_unlock_irqrestore(&clockfw_lock, flags);
ret = 0;
} else if(clk->set_rate != 0) {
spin_lock_irqsave(&clockfw_lock, flags);
ret = clk->set_rate(clk, rate);
spin_unlock_irqrestore(&clockfw_lock, flags);
}
if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
propagate_rate(clk);
return ret;
}
EXPORT_SYMBOL(clk_set_rate);
static unsigned calc_ext_dsor(unsigned long rate)
{
unsigned dsor;
/* MCLK and BCLK divisor selection is not linear:
* freq = 96MHz / dsor
*
* RATIO_SEL range: dsor <-> RATIO_SEL
* 0..6: (RATIO_SEL+2) <-> (dsor-2)
* 6..48: (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
* Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
* can not be used.
*/
for (dsor = 2; dsor < 96; ++dsor) {
if ((dsor & 1) && dsor > 8)
continue;
if (rate >= 96000000 / dsor)
break;
}
return dsor;
}
/* Only needed on 1510 */
static int set_uart_rate(struct clk * clk, unsigned long rate)
{
unsigned int val;
val = omap_readl(clk->enable_reg);
if (rate == 12000000)
val &= ~(1 << clk->enable_bit);
else if (rate == 48000000)
val |= (1 << clk->enable_bit);
else
return -EINVAL;
omap_writel(val, clk->enable_reg);
clk->rate = rate;
return 0;
}
static int set_ext_clk_rate(struct clk * clk, unsigned long rate)
{
unsigned dsor;
__u16 ratio_bits;
dsor = calc_ext_dsor(rate);
clk->rate = 96000000 / dsor;
if (dsor > 8)
ratio_bits = ((dsor - 8) / 2 + 6) << 2;
else
ratio_bits = (dsor - 2) << 2;
ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd;
omap_writew(ratio_bits, clk->enable_reg);
return 0;
}
static long round_ext_clk_rate(struct clk * clk, unsigned long rate)
{
return 96000000 / calc_ext_dsor(rate);
}
static void init_ext_clk(struct clk * clk)
{
unsigned dsor;
__u16 ratio_bits;
/* Determine current rate and ensure clock is based on 96MHz APLL */
ratio_bits = omap_readw(clk->enable_reg) & ~1;
omap_writew(ratio_bits, clk->enable_reg);
ratio_bits = (ratio_bits & 0xfc) >> 2;
if (ratio_bits > 6)
dsor = (ratio_bits - 6) * 2 + 8;
else
dsor = ratio_bits + 2;
clk-> rate = 96000000 / dsor;
}
int clk_register(struct clk *clk)
{
down(&clocks_sem);
list_add(&clk->node, &clocks);
if (clk->init)
clk->init(clk);
up(&clocks_sem);
return 0;
}
EXPORT_SYMBOL(clk_register);
void clk_unregister(struct clk *clk)
{
down(&clocks_sem);
list_del(&clk->node);
up(&clocks_sem);
}
EXPORT_SYMBOL(clk_unregister);
#ifdef CONFIG_OMAP_RESET_CLOCKS
/*
* Resets some clocks that may be left on from bootloader,
* but leaves serial clocks on. See also omap_late_clk_reset().
*/
static inline void omap_early_clk_reset(void)
{
//omap_writel(0x3 << 29, MOD_CONF_CTRL_0);
}
#else
#define omap_early_clk_reset() {}
#endif
int __init clk_init(void)
{
struct clk ** clkp;
const struct omap_clock_config *info;
int crystal_type = 0; /* Default 12 MHz */
omap_early_clk_reset();
for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
clk_register(*clkp);
continue;
}
if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
clk_register(*clkp);
continue;
}
if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
clk_register(*clkp);
continue;
}
}
info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
if (info != NULL) {
if (!cpu_is_omap1510())
crystal_type = info->system_clock_type;
}
#if defined(CONFIG_ARCH_OMAP730)
ck_ref.rate = 13000000;
#elif defined(CONFIG_ARCH_OMAP16XX)
if (crystal_type == 2)
ck_ref.rate = 19200000;
#endif
printk("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
omap_readw(ARM_CKCTL));
/* We want to be in syncronous scalable mode */
omap_writew(0x1000, ARM_SYSST);
#ifdef CONFIG_OMAP_CLOCKS_SET_BY_BOOTLOADER
/* Use values set by bootloader. Determine PLL rate and recalculate
* dependent clocks as if kernel had changed PLL or divisors.
*/
{
unsigned pll_ctl_val = omap_readw(DPLL_CTL);
ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
if (pll_ctl_val & 0x10) {
/* PLL enabled, apply multiplier and divisor */
if (pll_ctl_val & 0xf80)
ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
} else {
/* PLL disabled, apply bypass divisor */
switch (pll_ctl_val & 0xc) {
case 0:
break;
case 0x4:
ck_dpll1.rate /= 2;
break;
default:
ck_dpll1.rate /= 4;
break;
}
}
}
propagate_rate(&ck_dpll1);
#else
/* Find the highest supported frequency and enable it */
if (select_table_rate(&virtual_ck_mpu, ~0)) {
printk(KERN_ERR "System frequencies not set. Check your config.\n");
/* Guess sane values (60MHz) */
omap_writew(0x2290, DPLL_CTL);
omap_writew(0x1005, ARM_CKCTL);
ck_dpll1.rate = 60000000;
propagate_rate(&ck_dpll1);
}
#endif
/* Cache rates for clocks connected to ck_ref (not dpll1) */
propagate_rate(&ck_ref);
printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): "
"%ld.%01ld/%ld.%01ld/%ld.%01ld MHz\n",
ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
ck_dpll1.rate / 1000000, (ck_dpll1.rate / 100000) % 10,
arm_ck.rate / 1000000, (arm_ck.rate / 100000) % 10);
#ifdef CONFIG_MACH_OMAP_PERSEUS2
/* Select slicer output as OMAP input clock */
omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
#endif
/* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
/* Put DSP/MPUI into reset until needed */
omap_writew(0, ARM_RSTCT1);
omap_writew(1, ARM_RSTCT2);
omap_writew(0x400, ARM_IDLECT1);
/*
* According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
* of the ARM_IDLECT2 register must be set to zero. The power-on
* default value of this bit is one.
*/
omap_writew(0x0000, ARM_IDLECT2); /* Turn LCD clock off also */
/*
* Only enable those clocks we will need, let the drivers
* enable other clocks as necessary
*/
clk_use(&armper_ck);
clk_use(&armxor_ck);
clk_use(&armtim_ck);
if (cpu_is_omap1510())
clk_enable(&arm_gpio_ck);
return 0;
}
#ifdef CONFIG_OMAP_RESET_CLOCKS
static int __init omap_late_clk_reset(void)
{
/* Turn off all unused clocks */
struct clk *p;
__u32 regval32;
/* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */
regval32 = omap_readw(SOFT_REQ_REG) & (1 << 4);
omap_writew(regval32, SOFT_REQ_REG);
omap_writew(0, SOFT_REQ_REG2);
list_for_each_entry(p, &clocks, node) {
if (p->usecount > 0 || (p->flags & ALWAYS_ENABLED) ||
p->enable_reg == 0)
continue;
/* Assume no DSP clocks have been activated by bootloader */
if (p->flags & DSP_DOMAIN_CLOCK)
continue;
/* Is the clock already disabled? */
if (p->flags & ENABLE_REG_32BIT) {
if (p->flags & VIRTUAL_IO_ADDRESS)
regval32 = __raw_readl(p->enable_reg);
else
regval32 = omap_readl(p->enable_reg);
} else {
if (p->flags & VIRTUAL_IO_ADDRESS)
regval32 = __raw_readw(p->enable_reg);
else
regval32 = omap_readw(p->enable_reg);
}
if ((regval32 & (1 << p->enable_bit)) == 0)
continue;
/* FIXME: This clock seems to be necessary but no-one
* has asked for its activation. */
if (p == &tc2_ck // FIX: pm.c (SRAM), CCP, Camera
|| p == &ck_dpll1out // FIX: SoSSI, SSR
|| p == &arm_gpio_ck // FIX: GPIO code for 1510
) {
printk(KERN_INFO "FIXME: Clock \"%s\" seems unused\n",
p->name);
continue;
}
printk(KERN_INFO "Disabling unused clock \"%s\"... ", p->name);
__clk_disable(p);
printk(" done\n");
}
return 0;
}
late_initcall(omap_late_clk_reset);
#endif
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