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ARM: at91: remove old at91-specific clock driver

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This clock driver collection was specific to AT91 and only used in !DT cases.
All clocks and the clock trees for all Atmel SoCs are now described by drivers
using the common clock framework.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
This commit is contained in:
Nicolas Ferre 2014-11-26 17:19:14 +01:00
parent b31706a281
commit ff78a189b0
5 changed files with 0 additions and 1047 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/mach-at91/Makefile
View File

@ -5,7 +5,6 @@
obj-y := gpio.o setup.o sysirq_mask.o
obj-$(CONFIG_OLD_IRQ_AT91) += irq.o
obj-$(CONFIG_OLD_CLK_AT91) += clock.o
obj-$(CONFIG_SOC_AT91SAM9) += sam9_smc.o
# CPU-specific support

977
arch/arm/mach-at91/clock.c
View File

@ -1,977 +0,0 @@
/*
* linux/arch/arm/mach-at91/clock.c
*
* Copyright (C) 2005 David Brownell
* Copyright (C) 2005 Ivan Kokshaysky
*
* 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.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/clk/at91_pmc.h>
#include <mach/hardware.h>
#include <mach/cpu.h>
#include <asm/proc-fns.h>
#include "clock.h"
#include "generic.h"
void __iomem *at91_pmc_base;
EXPORT_SYMBOL_GPL(at91_pmc_base);
/*
* There's a lot more which can be done with clocks, including cpufreq
* integration, slow clock mode support (for system suspend), letting
* PLLB be used at other rates (on boards that don't need USB), etc.
*/
#define clk_is_primary(x) ((x)->type & CLK_TYPE_PRIMARY)
#define clk_is_programmable(x) ((x)->type & CLK_TYPE_PROGRAMMABLE)
#define clk_is_peripheral(x) ((x)->type & CLK_TYPE_PERIPHERAL)
#define clk_is_sys(x) ((x)->type & CLK_TYPE_SYSTEM)
/*
* Chips have some kind of clocks : group them by functionality
*/
#define cpu_has_utmi() ( cpu_is_at91sam9rl() \
|| cpu_is_at91sam9g45() \
|| cpu_is_at91sam9x5() \
|| cpu_is_sama5d3())
#define cpu_has_1056M_plla() (cpu_is_sama5d3())
#define cpu_has_800M_plla() ( cpu_is_at91sam9g20() \
|| cpu_is_at91sam9g45() \
|| cpu_is_at91sam9x5() \
|| cpu_is_at91sam9n12())
#define cpu_has_300M_plla() (cpu_is_at91sam9g10())
#define cpu_has_240M_plla() (cpu_is_at91sam9261() \
|| cpu_is_at91sam9263() \
|| cpu_is_at91sam9rl())
#define cpu_has_210M_plla() (cpu_is_at91sam9260())
#define cpu_has_pllb() (!(cpu_is_at91sam9rl() \
|| cpu_is_at91sam9g45() \
|| cpu_is_at91sam9x5() \
|| cpu_is_sama5d3()))
#define cpu_has_upll() (cpu_is_at91sam9g45() \
|| cpu_is_at91sam9x5() \
|| cpu_is_sama5d3())
/* USB host HS & FS */
#define cpu_has_uhp() (!cpu_is_at91sam9rl())
/* USB device FS only */
#define cpu_has_udpfs() (!(cpu_is_at91sam9rl() \
|| cpu_is_at91sam9g45() \
|| cpu_is_at91sam9x5() \
|| cpu_is_sama5d3()))
#define cpu_has_plladiv2() (cpu_is_at91sam9g45() \
|| cpu_is_at91sam9x5() \
|| cpu_is_at91sam9n12() \
|| cpu_is_sama5d3())
#define cpu_has_mdiv3() (cpu_is_at91sam9g45() \
|| cpu_is_at91sam9x5() \
|| cpu_is_at91sam9n12() \
|| cpu_is_sama5d3())
#define cpu_has_alt_prescaler() (cpu_is_at91sam9x5() \
|| cpu_is_at91sam9n12() \
|| cpu_is_sama5d3())
static LIST_HEAD(clocks);
static DEFINE_SPINLOCK(clk_lock);
static u32 at91_pllb_usb_init;
/*
* Four primary clock sources: two crystal oscillators (32K, main), and
* two PLLs. PLLA usually runs the master clock; and PLLB must run at
* 48 MHz (unless no USB function clocks are needed). The main clock and
* both PLLs are turned off to run in "slow clock mode" (system suspend).
*/
static struct clk clk32k = {
.name = "clk32k",
.rate_hz = AT91_SLOW_CLOCK,
.users = 1, /* always on */
.id = 0,
.type = CLK_TYPE_PRIMARY,
};
static struct clk main_clk = {
.name = "main",
.pmc_mask = AT91_PMC_MOSCS, /* in PMC_SR */
.id = 1,
.type = CLK_TYPE_PRIMARY,
};
static struct clk plla = {
.name = "plla",
.parent = &main_clk,
.pmc_mask = AT91_PMC_LOCKA, /* in PMC_SR */
.id = 2,
.type = CLK_TYPE_PRIMARY | CLK_TYPE_PLL,
};
static void pllb_mode(struct clk *clk, int is_on)
{
u32 value;
if (is_on) {
is_on = AT91_PMC_LOCKB;
value = at91_pllb_usb_init;
} else
value = 0;
// REVISIT: Add work-around for AT91RM9200 Errata #26 ?
at91_pmc_write(AT91_CKGR_PLLBR, value);
do {
cpu_relax();
} while ((at91_pmc_read(AT91_PMC_SR) & AT91_PMC_LOCKB) != is_on);
}
static struct clk pllb = {
.name = "pllb",
.parent = &main_clk,
.pmc_mask = AT91_PMC_LOCKB, /* in PMC_SR */
.mode = pllb_mode,
.id = 3,
.type = CLK_TYPE_PRIMARY | CLK_TYPE_PLL,
};
static void pmc_sys_mode(struct clk *clk, int is_on)
{
if (is_on)
at91_pmc_write(AT91_PMC_SCER, clk->pmc_mask);
else
at91_pmc_write(AT91_PMC_SCDR, clk->pmc_mask);
}
static void pmc_uckr_mode(struct clk *clk, int is_on)
{
unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
if (is_on) {
is_on = AT91_PMC_LOCKU;
at91_pmc_write(AT91_CKGR_UCKR, uckr | clk->pmc_mask);
} else
at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(clk->pmc_mask));
do {
cpu_relax();
} while ((at91_pmc_read(AT91_PMC_SR) & AT91_PMC_LOCKU) != is_on);
}
/* USB function clocks (PLLB must be 48 MHz) */
static struct clk udpck = {
.name = "udpck",
.parent = &pllb,
.mode = pmc_sys_mode,
};
struct clk utmi_clk = {
.name = "utmi_clk",
.parent = &main_clk,
.pmc_mask = AT91_PMC_UPLLEN, /* in CKGR_UCKR */
.mode = pmc_uckr_mode,
.type = CLK_TYPE_PLL,
};
static struct clk uhpck = {
.name = "uhpck",
/*.parent = ... we choose parent at runtime */
.mode = pmc_sys_mode,
};
/*
* The master clock is divided from the CPU clock (by 1-4). It's used for
* memory, interfaces to on-chip peripherals, the AIC, and sometimes more
* (e.g baud rate generation). It's sourced from one of the primary clocks.
*/
struct clk mck = {
.name = "mck",
.pmc_mask = AT91_PMC_MCKRDY, /* in PMC_SR */
};
static void pmc_periph_mode(struct clk *clk, int is_on)
{
u32 regval = 0;
/*
* With sama5d3 devices, we are managing clock division so we have to
* use the Peripheral Control Register introduced from at91sam9x5
* devices.
*/
if (cpu_is_sama5d3()) {
regval |= AT91_PMC_PCR_CMD; /* write command */
regval |= clk->pid & AT91_PMC_PCR_PID; /* peripheral selection */
regval |= AT91_PMC_PCR_DIV(clk->div);
if (is_on)
regval |= AT91_PMC_PCR_EN; /* enable clock */
at91_pmc_write(AT91_PMC_PCR, regval);
} else {
if (is_on)
at91_pmc_write(AT91_PMC_PCER, clk->pmc_mask);
else
at91_pmc_write(AT91_PMC_PCDR, clk->pmc_mask);
}
}
static struct clk __init *at91_css_to_clk(unsigned long css)
{
switch (css) {
case AT91_PMC_CSS_SLOW:
return &clk32k;
case AT91_PMC_CSS_MAIN:
return &main_clk;
case AT91_PMC_CSS_PLLA:
return &plla;
case AT91_PMC_CSS_PLLB:
if (cpu_has_upll())
/* CSS_PLLB == CSS_UPLL */
return &utmi_clk;
else if (cpu_has_pllb())
return &pllb;
break;
/* alternate PMC: can use master clock */
case AT91_PMC_CSS_MASTER:
return &mck;
}
return NULL;
}
static int pmc_prescaler_divider(u32 reg)
{
if (cpu_has_alt_prescaler()) {
return 1 << ((reg & AT91_PMC_ALT_PRES) >> PMC_ALT_PRES_OFFSET);
} else {
return 1 << ((reg & AT91_PMC_PRES) >> PMC_PRES_OFFSET);
}
}
static void __clk_enable(struct clk *clk)
{
if (clk->parent)
__clk_enable(clk->parent);
if (clk->users++ == 0 && clk->mode)
clk->mode(clk, 1);
}
int clk_enable(struct clk *clk)
{
unsigned long flags;
spin_lock_irqsave(&clk_lock, flags);
__clk_enable(clk);
spin_unlock_irqrestore(&clk_lock, flags);
return 0;
}
EXPORT_SYMBOL(clk_enable);
static void __clk_disable(struct clk *clk)
{
BUG_ON(clk->users == 0);
if (--clk->users == 0 && clk->mode)
clk->mode(clk, 0);
if (clk->parent)
__clk_disable(clk->parent);
}
void clk_disable(struct clk *clk)
{
unsigned long flags;
spin_lock_irqsave(&clk_lock, flags);
__clk_disable(clk);
spin_unlock_irqrestore(&clk_lock, flags);
}
EXPORT_SYMBOL(clk_disable);
unsigned long clk_get_rate(struct clk *clk)
{
unsigned long flags;
unsigned long rate;
spin_lock_irqsave(&clk_lock, flags);
for (;;) {
rate = clk->rate_hz;
if (rate || !clk->parent)
break;
clk = clk->parent;
}
spin_unlock_irqrestore(&clk_lock, flags);
return rate;
}
EXPORT_SYMBOL(clk_get_rate);
/*------------------------------------------------------------------------*/
/*
* For now, only the programmable clocks support reparenting (MCK could
* do this too, with care) or rate changing (the PLLs could do this too,
* ditto MCK but that's more for cpufreq). Drivers may reparent to get
* a better rate match; we don't.
*/
long clk_round_rate(struct clk *clk, unsigned long rate)
{
unsigned long flags;
unsigned prescale;
unsigned long actual;
unsigned long prev = ULONG_MAX;
if (!clk_is_programmable(clk))
return -EINVAL;
spin_lock_irqsave(&clk_lock, flags);
actual = clk->parent->rate_hz;
for (prescale = 0; prescale < 7; prescale++) {
if (actual > rate)
prev = actual;
if (actual && actual <= rate) {
if ((prev - rate) < (rate - actual)) {
actual = prev;
prescale--;
}
break;
}
actual >>= 1;
}
spin_unlock_irqrestore(&clk_lock, flags);
return (prescale < 7) ? actual : -ENOENT;
}
EXPORT_SYMBOL(clk_round_rate);
int clk_set_rate(struct clk *clk, unsigned long rate)
{
unsigned long flags;
unsigned prescale;
unsigned long prescale_offset, css_mask;
unsigned long actual;
if (!clk_is_programmable(clk))
return -EINVAL;
if (clk->users)
return -EBUSY;
if (cpu_has_alt_prescaler()) {
prescale_offset = PMC_ALT_PRES_OFFSET;
css_mask = AT91_PMC_ALT_PCKR_CSS;
} else {
prescale_offset = PMC_PRES_OFFSET;
css_mask = AT91_PMC_CSS;
}
spin_lock_irqsave(&clk_lock, flags);
actual = clk->parent->rate_hz;
for (prescale = 0; prescale < 7; prescale++) {
if (actual && actual <= rate) {
u32 pckr;
pckr = at91_pmc_read(AT91_PMC_PCKR(clk->id));
pckr &= css_mask; /* keep clock selection */
pckr |= prescale << prescale_offset;
at91_pmc_write(AT91_PMC_PCKR(clk->id), pckr);
clk->rate_hz = actual;
break;
}
actual >>= 1;
}
spin_unlock_irqrestore(&clk_lock, flags);
return (prescale < 7) ? actual : -ENOENT;
}
EXPORT_SYMBOL(clk_set_rate);
struct clk *clk_get_parent(struct clk *clk)
{
return clk->parent;
}
EXPORT_SYMBOL(clk_get_parent);
int clk_set_parent(struct clk *clk, struct clk *parent)
{
unsigned long flags;
if (clk->users)
return -EBUSY;
if (!clk_is_primary(parent) || !clk_is_programmable(clk))
return -EINVAL;
if (cpu_is_at91sam9rl() && parent->id == AT91_PMC_CSS_PLLB)
return -EINVAL;
spin_lock_irqsave(&clk_lock, flags);
clk->rate_hz = parent->rate_hz;
clk->parent = parent;
at91_pmc_write(AT91_PMC_PCKR(clk->id), parent->id);
spin_unlock_irqrestore(&clk_lock, flags);
return 0;
}
EXPORT_SYMBOL(clk_set_parent);
/* establish PCK0..PCKN parentage and rate */
static void __init init_programmable_clock(struct clk *clk)
{
struct clk *parent;
u32 pckr;
unsigned int css_mask;
if (cpu_has_alt_prescaler())
css_mask = AT91_PMC_ALT_PCKR_CSS;
else
css_mask = AT91_PMC_CSS;
pckr = at91_pmc_read(AT91_PMC_PCKR(clk->id));
parent = at91_css_to_clk(pckr & css_mask);
clk->parent = parent;
clk->rate_hz = parent->rate_hz / pmc_prescaler_divider(pckr);
}
/*------------------------------------------------------------------------*/
#ifdef CONFIG_DEBUG_FS
static int at91_clk_show(struct seq_file *s, void *unused)
{
u32 scsr, pcsr, pcsr1 = 0, uckr = 0, sr;
struct clk *clk;
scsr = at91_pmc_read(AT91_PMC_SCSR);
pcsr = at91_pmc_read(AT91_PMC_PCSR);
if (cpu_is_sama5d3())
pcsr1 = at91_pmc_read(AT91_PMC_PCSR1);
sr = at91_pmc_read(AT91_PMC_SR);
seq_printf(s, "SCSR = %8x\n", scsr);
seq_printf(s, "PCSR = %8x\n", pcsr);
if (cpu_is_sama5d3())
seq_printf(s, "PCSR1 = %8x\n", pcsr1);
seq_printf(s, "MOR = %8x\n", at91_pmc_read(AT91_CKGR_MOR));
seq_printf(s, "MCFR = %8x\n", at91_pmc_read(AT91_CKGR_MCFR));
seq_printf(s, "PLLA = %8x\n", at91_pmc_read(AT91_CKGR_PLLAR));
if (cpu_has_pllb())
seq_printf(s, "PLLB = %8x\n", at91_pmc_read(AT91_CKGR_PLLBR));
if (cpu_has_utmi()) {
uckr = at91_pmc_read(AT91_CKGR_UCKR);
seq_printf(s, "UCKR = %8x\n", uckr);
}
seq_printf(s, "MCKR = %8x\n", at91_pmc_read(AT91_PMC_MCKR));
if (cpu_has_upll() || cpu_is_at91sam9n12())
seq_printf(s, "USB = %8x\n", at91_pmc_read(AT91_PMC_USB));
seq_printf(s, "SR = %8x\n", sr);
seq_printf(s, "\n");
list_for_each_entry(clk, &clocks, node) {
char *state;
if (clk->mode == pmc_sys_mode) {
state = (scsr & clk->pmc_mask) ? "on" : "off";
} else if (clk->mode == pmc_periph_mode) {
if (cpu_is_sama5d3()) {
u32 pmc_mask = 1 << (clk->pid % 32);
if (clk->pid > 31)
state = (pcsr1 & pmc_mask) ? "on" : "off";
else
state = (pcsr & pmc_mask) ? "on" : "off";
} else {
state = (pcsr & clk->pmc_mask) ? "on" : "off";
}
} else if (clk->mode == pmc_uckr_mode) {
state = (uckr & clk->pmc_mask) ? "on" : "off";
} else if (clk->pmc_mask) {
state = (sr & clk->pmc_mask) ? "on" : "off";
} else if (clk == &clk32k || clk == &main_clk) {
state = "on";
} else {
state = "";
}
seq_printf(s, "%-10s users=%2d %-3s %9lu Hz %s\n",
clk->name, clk->users, state, clk_get_rate(clk),
clk->parent ? clk->parent->name : "");
}
return 0;
}
static int at91_clk_open(struct inode *inode, struct file *file)
{
return single_open(file, at91_clk_show, NULL);
}
static const struct file_operations at91_clk_operations = {
.open = at91_clk_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init at91_clk_debugfs_init(void)
{
/* /sys/kernel/debug/at91_clk */
(void) debugfs_create_file("at91_clk", S_IFREG | S_IRUGO, NULL, NULL, &at91_clk_operations);
return 0;
}
postcore_initcall(at91_clk_debugfs_init);
#endif
/*------------------------------------------------------------------------*/
/* Register a new clock */
static void __init at91_clk_add(struct clk *clk)
{
list_add_tail(&clk->node, &clocks);
clk->cl.con_id = clk->name;
clk->cl.clk = clk;
clkdev_add(&clk->cl);
}
int __init clk_register(struct clk *clk)
{
if (clk_is_peripheral(clk)) {
if (!clk->parent)
clk->parent = &mck;
if (cpu_is_sama5d3())
clk->rate_hz = DIV_ROUND_UP(clk->parent->rate_hz,
1 << clk->div);
clk->mode = pmc_periph_mode;
}
else if (clk_is_sys(clk)) {
clk->parent = &mck;
clk->mode = pmc_sys_mode;
}
else if (clk_is_programmable(clk)) {
clk->mode = pmc_sys_mode;
init_programmable_clock(clk);
}
at91_clk_add(clk);
return 0;
}
/*------------------------------------------------------------------------*/
static u32 __init at91_pll_rate(struct clk *pll, u32 freq, u32 reg)
{
unsigned mul, div;
div = reg & 0xff;
if (cpu_is_sama5d3())
mul = AT91_PMC3_MUL_GET(reg);
else
mul = AT91_PMC_MUL_GET(reg);
if (div && mul) {
freq /= div;
freq *= mul + 1;
} else
freq = 0;
return freq;
}
static u32 __init at91_usb_rate(struct clk *pll, u32 freq, u32 reg)
{
if (pll == &pllb && (reg & AT91_PMC_USB96M))
return freq / 2;
else if (pll == &utmi_clk || cpu_is_at91sam9n12())
return freq / (1 + ((reg & AT91_PMC_OHCIUSBDIV) >> 8));
else
return freq;
}
static unsigned __init at91_pll_calc(unsigned main_freq, unsigned out_freq)
{
unsigned i, div = 0, mul = 0, diff = 1 << 30;
unsigned ret = (out_freq > 155000000) ? 0xbe00 : 0x3e00;
/* PLL output max 240 MHz (or 180 MHz per errata) */
if (out_freq > 240000000)
goto fail;
for (i = 1; i < 256; i++) {
int diff1;
unsigned input, mul1;
/*
* PLL input between 1MHz and 32MHz per spec, but lower
* frequences seem necessary in some cases so allow 100K.
* Warning: some newer products need 2MHz min.
*/
input = main_freq / i;
if (cpu_is_at91sam9g20() && input < 2000000)
continue;
if (input < 100000)
continue;
if (input > 32000000)
continue;
mul1 = out_freq / input;
if (cpu_is_at91sam9g20() && mul > 63)
continue;
if (mul1 > 2048)
continue;
if (mul1 < 2)
goto fail;
diff1 = out_freq - input * mul1;
if (diff1 < 0)
diff1 = -diff1;
if (diff > diff1) {
diff = diff1;
div = i;
mul = mul1;
if (diff == 0)
break;
}
}
if (i == 256 && diff > (out_freq >> 5))
goto fail;
return ret | ((mul - 1) << 16) | div;
fail:
return 0;
}
static struct clk *const standard_pmc_clocks[] __initconst = {
/* four primary clocks */
&clk32k,
&main_clk,
&plla,
/* MCK */
&mck
};
/* PLLB generated USB full speed clock init */
static void __init at91_pllb_usbfs_clock_init(unsigned long main_clock)
{
unsigned int reg;
/*
* USB clock init: choose 48 MHz PLLB value,
* disable 48MHz clock during usb peripheral suspend.
*
* REVISIT: assumes MCK doesn't derive from PLLB!
*/
uhpck.parent = &pllb;
reg = at91_pllb_usb_init = at91_pll_calc(main_clock, 48000000 * 2);
pllb.rate_hz = at91_pll_rate(&pllb, main_clock, at91_pllb_usb_init);
if (cpu_is_at91rm9200()) {
reg = at91_pllb_usb_init |= AT91_PMC_USB96M;
uhpck.pmc_mask = AT91RM9200_PMC_UHP;
udpck.pmc_mask = AT91RM9200_PMC_UDP;
at91_pmc_write(AT91_PMC_SCER, AT91RM9200_PMC_MCKUDP);
} else if (cpu_is_at91sam9260() || cpu_is_at91sam9261() ||
cpu_is_at91sam9263() || cpu_is_at91sam9g20() ||
cpu_is_at91sam9g10()) {
reg = at91_pllb_usb_init |= AT91_PMC_USB96M;
uhpck.pmc_mask = AT91SAM926x_PMC_UHP;
udpck.pmc_mask = AT91SAM926x_PMC_UDP;
} else if (cpu_is_at91sam9n12()) {
/* Divider for USB clock is in USB clock register for 9n12 */
reg = AT91_PMC_USBS_PLLB;
/* For PLLB output 96M, set usb divider 2 (USBDIV + 1) */
reg |= AT91_PMC_OHCIUSBDIV_2;
at91_pmc_write(AT91_PMC_USB, reg);
/* Still setup masks */
uhpck.pmc_mask = AT91SAM926x_PMC_UHP;
udpck.pmc_mask = AT91SAM926x_PMC_UDP;
}
at91_pmc_write(AT91_CKGR_PLLBR, 0);
udpck.rate_hz = at91_usb_rate(&pllb, pllb.rate_hz, reg);
uhpck.rate_hz = at91_usb_rate(&pllb, pllb.rate_hz, reg);
}
/* UPLL generated USB full speed clock init */
static void __init at91_upll_usbfs_clock_init(unsigned long main_clock)
{
/*
* USB clock init: choose 480 MHz from UPLL,
*/
unsigned int usbr = AT91_PMC_USBS_UPLL;
/* Setup divider by 10 to reach 48 MHz */
usbr |= ((10 - 1) << 8) & AT91_PMC_OHCIUSBDIV;
at91_pmc_write(AT91_PMC_USB, usbr);
/* Now set uhpck values */
uhpck.parent = &utmi_clk;
uhpck.pmc_mask = AT91SAM926x_PMC_UHP;
uhpck.rate_hz = at91_usb_rate(&utmi_clk, utmi_clk.rate_hz, usbr);
}
static int __init at91_pmc_init(unsigned long main_clock)
{
unsigned tmp, freq, mckr;
int i;
int pll_overclock = false;
/*
* When the bootloader initialized the main oscillator correctly,
* there's no problem using the cycle counter. But if it didn't,
* or when using oscillator bypass mode, we must be told the speed
* of the main clock.
*/
if (!main_clock) {
do {
tmp = at91_pmc_read(AT91_CKGR_MCFR);
} while (!(tmp & AT91_PMC_MAINRDY));
main_clock = (tmp & AT91_PMC_MAINF) * (AT91_SLOW_CLOCK / 16);
}
main_clk.rate_hz = main_clock;
/* report if PLLA is more than mildly overclocked */
plla.rate_hz = at91_pll_rate(&plla, main_clock, at91_pmc_read(AT91_CKGR_PLLAR));
if (cpu_has_1056M_plla()) {
if (plla.rate_hz > 1056000000)
pll_overclock = true;
} else if (cpu_has_800M_plla()) {
if (plla.rate_hz > 800000000)
pll_overclock = true;
} else if (cpu_has_300M_plla()) {
if (plla.rate_hz > 300000000)
pll_overclock = true;
} else if (cpu_has_240M_plla()) {
if (plla.rate_hz > 240000000)
pll_overclock = true;
} else if (cpu_has_210M_plla()) {
if (plla.rate_hz > 210000000)
pll_overclock = true;
} else {
if (plla.rate_hz > 209000000)
pll_overclock = true;
}
if (pll_overclock)
pr_info("Clocks: PLLA overclocked, %ld MHz\n", plla.rate_hz / 1000000);
if (cpu_has_plladiv2()) {
mckr = at91_pmc_read(AT91_PMC_MCKR);
plla.rate_hz /= (1 << ((mckr & AT91_PMC_PLLADIV2) >> 12)); /* plla divisor by 2 */
}
if (!cpu_has_pllb() && cpu_has_upll()) {
/* setup UTMI clock as the fourth primary clock
* (instead of pllb) */
utmi_clk.type |= CLK_TYPE_PRIMARY;
utmi_clk.id = 3;
}
/*
* USB HS clock init
*/
if (cpu_has_utmi()) {
/*
* multiplier is hard-wired to 40
* (obtain the USB High Speed 480 MHz when input is 12 MHz)
*/
utmi_clk.rate_hz = 40 * utmi_clk.parent->rate_hz;
/* UTMI bias and PLL are managed at the same time */
if (cpu_has_upll())
utmi_clk.pmc_mask |= AT91_PMC_BIASEN;
}
/*
* USB FS clock init
*/
if (cpu_has_pllb())
at91_pllb_usbfs_clock_init(main_clock);
if (cpu_has_upll())
/* assumes that we choose UPLL for USB and not PLLA */
at91_upll_usbfs_clock_init(main_clock);
/*
* MCK and CPU derive from one of those primary clocks.
* For now, assume this parentage won't change.
*/
mckr = at91_pmc_read(AT91_PMC_MCKR);
mck.parent = at91_css_to_clk(mckr & AT91_PMC_CSS);
freq = mck.parent->rate_hz;
freq /= pmc_prescaler_divider(mckr); /* prescale */
if (cpu_is_at91rm9200()) {
mck.rate_hz = freq / (1 + ((mckr & AT91_PMC_MDIV) >> 8)); /* mdiv */
} else if (cpu_is_at91sam9g20()) {
mck.rate_hz = (mckr & AT91_PMC_MDIV) ?
freq / ((mckr & AT91_PMC_MDIV) >> 7) : freq; /* mdiv ; (x >> 7) = ((x >> 8) * 2) */
if (mckr & AT91_PMC_PDIV)
freq /= 2; /* processor clock division */
} else if (cpu_has_mdiv3()) {
mck.rate_hz = (mckr & AT91_PMC_MDIV) == AT91SAM9_PMC_MDIV_3 ?
freq / 3 : freq / (1 << ((mckr & AT91_PMC_MDIV) >> 8)); /* mdiv */
} else {
mck.rate_hz = freq / (1 << ((mckr & AT91_PMC_MDIV) >> 8)); /* mdiv */
}
if (cpu_has_alt_prescaler()) {
/* Programmable clocks can use MCK */
mck.type |= CLK_TYPE_PRIMARY;
mck.id = 4;
}
/* Register the PMC's standard clocks */
for (i = 0; i < ARRAY_SIZE(standard_pmc_clocks); i++)
at91_clk_add(standard_pmc_clocks[i]);
if (cpu_has_pllb())
at91_clk_add(&pllb);
if (cpu_has_uhp())
at91_clk_add(&uhpck);
if (cpu_has_udpfs())
at91_clk_add(&udpck);
if (cpu_has_utmi())
at91_clk_add(&utmi_clk);
/* MCK and CPU clock are "always on" */
clk_enable(&mck);
printk("Clocks: CPU %u MHz, master %u MHz, main %u.%03u MHz\n",
freq / 1000000, (unsigned) mck.rate_hz / 1000000,
(unsigned) main_clock / 1000000,
((unsigned) main_clock % 1000000) / 1000);
return 0;
}
#if defined(CONFIG_OF)
static struct of_device_id pmc_ids[] = {
{ .compatible = "atmel,at91rm9200-pmc" },
{ .compatible = "atmel,at91sam9260-pmc" },
{ .compatible = "atmel,at91sam9g45-pmc" },
{ .compatible = "atmel,at91sam9n12-pmc" },
{ .compatible = "atmel,at91sam9x5-pmc" },
{ .compatible = "atmel,sama5d3-pmc" },
{ /*sentinel*/ }
};
static struct of_device_id osc_ids[] = {
{ .compatible = "atmel,osc" },
{ /*sentinel*/ }
};
int __init at91_dt_clock_init(void)
{
struct device_node *np;
u32 main_clock = 0;
np = of_find_matching_node(NULL, pmc_ids);
if (!np)
panic("unable to find compatible pmc node in dtb\n");
at91_pmc_base = of_iomap(np, 0);
if (!at91_pmc_base)
panic("unable to map pmc cpu registers\n");
of_node_put(np);
/* retrieve the freqency of fixed clocks from device tree */
np = of_find_matching_node(NULL, osc_ids);
if (np) {
u32 rate;
if (!of_property_read_u32(np, "clock-frequency", &rate))
main_clock = rate;
}
of_node_put(np);
return at91_pmc_init(main_clock);
}
#endif
int __init at91_clock_init(unsigned long main_clock)
{
at91_pmc_base = ioremap(AT91_PMC, 256);
if (!at91_pmc_base)
panic("Impossible to ioremap AT91_PMC 0x%x\n", AT91_PMC);
return at91_pmc_init(main_clock);
}
/*
* Several unused clocks may be active. Turn them off.
*/
static int __init at91_clock_reset(void)
{
unsigned long pcdr = 0;
unsigned long pcdr1 = 0;
unsigned long scdr = 0;
struct clk *clk;
list_for_each_entry(clk, &clocks, node) {
if (clk->users > 0)
continue;
if (clk->mode == pmc_periph_mode) {
if (cpu_is_sama5d3()) {
u32 pmc_mask = 1 << (clk->pid % 32);
if (clk->pid > 31)
pcdr1 |= pmc_mask;
else
pcdr |= pmc_mask;
} else
pcdr |= clk->pmc_mask;
}
if (clk->mode == pmc_sys_mode)
scdr |= clk->pmc_mask;
pr_debug("Clocks: disable unused %s\n", clk->name);
}
at91_pmc_write(AT91_PMC_SCDR, scdr);
at91_pmc_write(AT91_PMC_PCDR, pcdr);
if (cpu_is_sama5d3())
at91_pmc_write(AT91_PMC_PCDR1, pcdr1);
return 0;
}
late_initcall(at91_clock_reset);
void at91sam9_idle(void)
{
at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
cpu_do_idle();
}

49
arch/arm/mach-at91/clock.h
View File

@ -1,49 +0,0 @@
/*
* linux/arch/arm/mach-at91/clock.h
*
* 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/clkdev.h>
#define CLK_TYPE_PRIMARY 0x1
#define CLK_TYPE_PLL 0x2
#define CLK_TYPE_PROGRAMMABLE 0x4
#define CLK_TYPE_PERIPHERAL 0x8
#define CLK_TYPE_SYSTEM 0x10
struct clk {
struct list_head node;
const char *name; /* unique clock name */
struct clk_lookup cl;
unsigned long rate_hz;
unsigned div; /* parent clock divider */
struct clk *parent;
unsigned pid; /* peripheral ID */
u32 pmc_mask;
void (*mode)(struct clk *, int);
unsigned id:3; /* PCK0..4, or 32k/main/a/b */
unsigned type; /* clock type */
u16 users;
};
extern int __init clk_register(struct clk *clk);
extern struct clk mck;
extern struct clk utmi_clk;
#define CLKDEV_CON_ID(_id, _clk) \
{ \
.con_id = _id, \
.clk = _clk, \
}
#define CLKDEV_CON_DEV_ID(_con_id, _dev_id, _clk) \
{ \
.con_id = _con_id, \
.dev_id = _dev_id, \
.clk = _clk, \
}

11
arch/arm/mach-at91/generic.h
View File

@ -11,7 +11,6 @@
#ifndef _AT91_GENERIC_H
#define _AT91_GENERIC_H
#include <linux/clkdev.h>
#include <linux/of.h>
#include <linux/reboot.h>
@ -49,16 +48,6 @@ extern void at91rm9200_timer_init(void);
extern void at91sam926x_ioremap_pit(u32 addr);
extern void at91sam926x_pit_init(int irq);
/* Clocks */
#ifdef CONFIG_OLD_CLK_AT91
extern int __init at91_clock_init(unsigned long main_clock);
extern int __init at91_dt_clock_init(void);
#else
static int inline at91_clock_init(unsigned long main_clock) { return 0; }
static int inline at91_dt_clock_init(void) { return 0; }
#endif
struct device;
/* Power Management */
extern void at91_irq_suspend(void);
extern void at91_irq_resume(void);

9
arch/arm/mach-at91/setup.c
View File

@ -460,9 +460,6 @@ void __init at91rm9200_dt_initialize(void)
{
at91_dt_ramc();
/* Init clock subsystem */
at91_dt_clock_init();
/* Register the processor-specific clocks */
if (at91_boot_soc.register_clocks)
at91_boot_soc.register_clocks();
@ -474,9 +471,6 @@ void __init at91_dt_initialize(void)
{
at91_dt_ramc();
/* Init clock subsystem */
at91_dt_clock_init();
/* Register the processor-specific clocks */
if (at91_boot_soc.register_clocks)
at91_boot_soc.register_clocks();
@ -490,9 +484,6 @@ void __init at91_initialize(unsigned long main_clock)
{
at91_boot_soc.ioremap_registers();
/* Init clock subsystem */
at91_clock_init(main_clock);
/* Register the processor-specific clocks */
at91_boot_soc.register_clocks();