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clk: add highbank clock support

Browse Source 
This adds real clock support to Calxeda Highbank SOC using the common
clock infrastructure.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
[mturquette@linaro.org: fixed up invalid writes to const struct member]
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Rob Herring 2012-03-13 18:19:19 -05:00 committed by Mike Turquette
parent 260b6aa03e
commit 8d4d9f5208
8 changed files with 463 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Documentation/devicetree/bindings/clock/calxeda.txt Normal file
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@ -0,0 +1,17 @@
Device Tree Clock bindings for Calxeda highbank platform
This binding uses the common clock binding[1].
[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
Required properties:
- compatible : shall be one of the following:
"calxeda,hb-pll-clock" - for a PLL clock
"calxeda,hb-a9periph-clock" - The A9 peripheral clock divided from the
A9 clock.
"calxeda,hb-a9bus-clock" - The A9 bus clock divided from the A9 clock.
"calxeda,hb-emmc-clock" - Divided clock for MMC/SD controller.
- reg : shall be the control register offset from SYSREGs base for the clock.
- clocks : shall be the input parent clock phandle for the clock. This is
either an oscillator or a pll output.
- #clock-cells : from common clock binding; shall be set to 0.

1
arch/arm/Kconfig
View File

@ -352,6 +352,7 @@ config ARCH_HIGHBANK
select ARM_TIMER_SP804
select CACHE_L2X0
select CLKDEV_LOOKUP
select COMMON_CLK
select CPU_V7
select GENERIC_CLOCKEVENTS
select HAVE_ARM_SCU

91
arch/arm/boot/dts/highbank.dts
View File

@ -1,5 +1,5 @@
/*
* Copyright 2011 Calxeda, Inc.
* Copyright 2011-2012 Calxeda, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@ -24,6 +24,7 @@
compatible = "calxeda,highbank";
#address-cells = <1>;
#size-cells = <1>;
clock-ranges;
cpus {
#address-cells = <1>;
@ -33,24 +34,32 @@
compatible = "arm,cortex-a9";
reg = <0>;
next-level-cache = <&L2>;
clocks = <&a9pll>;
clock-names = "cpu";
};
cpu@1 {
compatible = "arm,cortex-a9";
reg = <1>;
next-level-cache = <&L2>;
clocks = <&a9pll>;
clock-names = "cpu";
};
cpu@2 {
compatible = "arm,cortex-a9";
reg = <2>;
next-level-cache = <&L2>;
clocks = <&a9pll>;
clock-names = "cpu";
};
cpu@3 {
compatible = "arm,cortex-a9";
reg = <3>;
next-level-cache = <&L2>;
clocks = <&a9pll>;
clock-names = "cpu";
};
};
@ -75,12 +84,14 @@
compatible = "arm,cortex-a9-twd-timer";
reg = <0xfff10600 0x20>;
interrupts = <1 13 0xf01>;
clocks = <&a9periphclk>;
};
watchdog@fff10620 {
compatible = "arm,cortex-a9-twd-wdt";
reg = <0xfff10620 0x20>;
interrupts = <1 14 0xf01>;
clocks = <&a9periphclk>;
};
intc: interrupt-controller@fff11000 {
@ -116,12 +127,15 @@
compatible = "calxeda,hb-sdhci";
reg = <0xffe0e000 0x1000>;
interrupts = <0 90 4>;
clocks = <&eclk>;
};
ipc@fff20000 {
compatible = "arm,pl320", "arm,primecell";
reg = <0xfff20000 0x1000>;
interrupts = <0 7 4>;
clocks = <&pclk>;
clock-names = "apb_pclk";
};
gpioe: gpio@fff30000 {
@ -130,6 +144,8 @@
gpio-controller;
reg = <0xfff30000 0x1000>;
interrupts = <0 14 4>;
clocks = <&pclk>;
clock-names = "apb_pclk";
};
gpiof: gpio@fff31000 {
@ -138,6 +154,8 @@
gpio-controller;
reg = <0xfff31000 0x1000>;
interrupts = <0 15 4>;
clocks = <&pclk>;
clock-names = "apb_pclk";
};
gpiog: gpio@fff32000 {
@ -146,6 +164,8 @@
gpio-controller;
reg = <0xfff32000 0x1000>;
interrupts = <0 16 4>;
clocks = <&pclk>;
clock-names = "apb_pclk";
};
gpioh: gpio@fff33000 {
@ -154,24 +174,32 @@
gpio-controller;
reg = <0xfff33000 0x1000>;
interrupts = <0 17 4>;
clocks = <&pclk>;
clock-names = "apb_pclk";
};
timer {
compatible = "arm,sp804", "arm,primecell";
reg = <0xfff34000 0x1000>;
interrupts = <0 18 4>;
clocks = <&pclk>;
clock-names = "apb_pclk";
};
rtc@fff35000 {
compatible = "arm,pl031", "arm,primecell";
reg = <0xfff35000 0x1000>;
interrupts = <0 19 4>;
clocks = <&pclk>;
clock-names = "apb_pclk";
};
serial@fff36000 {
compatible = "arm,pl011", "arm,primecell";
reg = <0xfff36000 0x1000>;
interrupts = <0 20 4>;
clocks = <&pclk>;
clock-names = "apb_pclk";
};
smic@fff3a000 {
@ -186,12 +214,73 @@
sregs@fff3c000 {
compatible = "calxeda,hb-sregs";
reg = <0xfff3c000 0x1000>;
clocks {
#address-cells = <1>;
#size-cells = <0>;
osc: oscillator {
#clock-cells = <0>;
compatible = "fixed-clock";
clock-frequency = <33333000>;
};
ddrpll: ddrpll {
#clock-cells = <0>;
compatible = "calxeda,hb-pll-clock";
clocks = <&osc>;
reg = <0x108>;
};
a9pll: a9pll {
#clock-cells = <0>;
compatible = "calxeda,hb-pll-clock";
clocks = <&osc>;
reg = <0x100>;
};
a9periphclk: a9periphclk {
#clock-cells = <0>;
compatible = "calxeda,hb-a9periph-clock";
clocks = <&a9pll>;
reg = <0x104>;
};
a9bclk: a9bclk {
#clock-cells = <0>;
compatible = "calxeda,hb-a9bus-clock";
clocks = <&a9pll>;
reg = <0x104>;
};
emmcpll: emmcpll {
#clock-cells = <0>;
compatible = "calxeda,hb-pll-clock";
clocks = <&osc>;
reg = <0x10C>;
};
eclk: eclk {
#clock-cells = <0>;
compatible = "calxeda,hb-emmc-clock";
clocks = <&emmcpll>;
reg = <0x114>;
};
pclk: pclk {
#clock-cells = <0>;
compatible = "fixed-clock";
clock-frequency = <150000000>;
};
};
};
dma@fff3d000 {
compatible = "arm,pl330", "arm,primecell";
reg = <0xfff3d000 0x1000>;
interrupts = <0 92 4>;
clocks = <&pclk>;
clock-names = "apb_pclk";
};
ethernet@fff50000 {

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

@ -1,4 +1,4 @@
obj-y := clock.o highbank.o system.o smc.o
obj-y := highbank.o system.o smc.o
plus_sec := $(call as-instr,.arch_extension sec,+sec)
AFLAGS_smc.o :=-Wa,-march=armv7-a$(plus_sec)

62
arch/arm/mach-highbank/clock.c
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@ -1,62 +0,0 @@
/*
* Copyright 2011 Calxeda, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
struct clk {
unsigned long rate;
};
int clk_enable(struct clk *clk)
{
return 0;
}
void clk_disable(struct clk *clk)
{}
unsigned long clk_get_rate(struct clk *clk)
{
return clk->rate;
}
long clk_round_rate(struct clk *clk, unsigned long rate)
{
return clk->rate;
}
int clk_set_rate(struct clk *clk, unsigned long rate)
{
return 0;
}
static struct clk eclk = { .rate = 200000000 };
static struct clk pclk = { .rate = 150000000 };
static struct clk_lookup lookups[] = {
{ .clk = &pclk, .con_id = "apb_pclk", },
{ .clk = &pclk, .dev_id = "sp804", },
{ .clk = &eclk, .dev_id = "ffe0e000.sdhci", },
{ .clk = &pclk, .dev_id = "fff36000.serial", },
};
void __init highbank_clocks_init(void)
{
clkdev_add_table(lookups, ARRAY_SIZE(lookups));
}

7
arch/arm/mach-highbank/highbank.c
View File

@ -105,6 +105,11 @@ static void __init highbank_init_irq(void)
#endif
}
static struct clk_lookup lookup = {
.dev_id = "sp804",
.con_id = NULL,
};
static void __init highbank_timer_init(void)
{
int irq;
@ -122,6 +127,8 @@ static void __init highbank_timer_init(void)
irq = irq_of_parse_and_map(np, 0);
highbank_clocks_init();
lookup.clk = of_clk_get(np, 0);
clkdev_add(&lookup);
sp804_clocksource_and_sched_clock_init(timer_base + 0x20, "timer1");
sp804_clockevents_init(timer_base, irq, "timer0");

1
drivers/clk/Makefile
View File

@ -3,6 +3,7 @@ obj-$(CONFIG_CLKDEV_LOOKUP) += clkdev.o
obj-$(CONFIG_COMMON_CLK) += clk.o clk-fixed-rate.o clk-gate.o \
clk-mux.o clk-divider.o clk-fixed-factor.o
# SoCs specific
obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o
obj-$(CONFIG_ARCH_MXS) += mxs/
obj-$(CONFIG_PLAT_SPEAR) += spear/
obj-$(CONFIG_ARCH_U300) += clk-u300.o

346
drivers/clk/clk-highbank.c Normal file
View File

@ -0,0 +1,346 @@
/*
* Copyright 2011-2012 Calxeda, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/of.h>
extern void __iomem *sregs_base;
#define HB_PLL_LOCK_500 0x20000000
#define HB_PLL_LOCK 0x10000000
#define HB_PLL_DIVF_SHIFT 20
#define HB_PLL_DIVF_MASK 0x0ff00000
#define HB_PLL_DIVQ_SHIFT 16
#define HB_PLL_DIVQ_MASK 0x00070000
#define HB_PLL_DIVR_SHIFT 8
#define HB_PLL_DIVR_MASK 0x00001f00
#define HB_PLL_RANGE_SHIFT 4
#define HB_PLL_RANGE_MASK 0x00000070
#define HB_PLL_BYPASS 0x00000008
#define HB_PLL_RESET 0x00000004
#define HB_PLL_EXT_BYPASS 0x00000002
#define HB_PLL_EXT_ENA 0x00000001
#define HB_PLL_VCO_MIN_FREQ 2133000000
#define HB_PLL_MAX_FREQ HB_PLL_VCO_MIN_FREQ
#define HB_PLL_MIN_FREQ (HB_PLL_VCO_MIN_FREQ / 64)
#define HB_A9_BCLK_DIV_MASK 0x00000006
#define HB_A9_BCLK_DIV_SHIFT 1
#define HB_A9_PCLK_DIV 0x00000001
struct hb_clk {
struct clk_hw hw;
void __iomem *reg;
char *parent_name;
};
#define to_hb_clk(p) container_of(p, struct hb_clk, hw)
static int clk_pll_prepare(struct clk_hw *hwclk)
{
struct hb_clk *hbclk = to_hb_clk(hwclk);
u32 reg;
reg = readl(hbclk->reg);
reg &= ~HB_PLL_RESET;
writel(reg, hbclk->reg);
while ((readl(hbclk->reg) & HB_PLL_LOCK) == 0)
;
while ((readl(hbclk->reg) & HB_PLL_LOCK_500) == 0)
;
return 0;
}
static void clk_pll_unprepare(struct clk_hw *hwclk)
{
struct hb_clk *hbclk = to_hb_clk(hwclk);
u32 reg;
reg = readl(hbclk->reg);
reg |= HB_PLL_RESET;
writel(reg, hbclk->reg);
}
static int clk_pll_enable(struct clk_hw *hwclk)
{
struct hb_clk *hbclk = to_hb_clk(hwclk);
u32 reg;
reg = readl(hbclk->reg);
reg |= HB_PLL_EXT_ENA;
writel(reg, hbclk->reg);
return 0;
}
static void clk_pll_disable(struct clk_hw *hwclk)
{
struct hb_clk *hbclk = to_hb_clk(hwclk);
u32 reg;
reg = readl(hbclk->reg);
reg &= ~HB_PLL_EXT_ENA;
writel(reg, hbclk->reg);
}
static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk,
unsigned long parent_rate)
{
struct hb_clk *hbclk = to_hb_clk(hwclk);
unsigned long divf, divq, vco_freq, reg;
reg = readl(hbclk->reg);
if (reg & HB_PLL_EXT_BYPASS)
return parent_rate;
divf = (reg & HB_PLL_DIVF_MASK) >> HB_PLL_DIVF_SHIFT;
divq = (reg & HB_PLL_DIVQ_MASK) >> HB_PLL_DIVQ_SHIFT;
vco_freq = parent_rate * (divf + 1);
return vco_freq / (1 << divq);
}
static void clk_pll_calc(unsigned long rate, unsigned long ref_freq,
u32 *pdivq, u32 *pdivf)
{
u32 divq, divf;
unsigned long vco_freq;
if (rate < HB_PLL_MIN_FREQ)
rate = HB_PLL_MIN_FREQ;
if (rate > HB_PLL_MAX_FREQ)
rate = HB_PLL_MAX_FREQ;
for (divq = 1; divq <= 6; divq++) {
if ((rate * (1 << divq)) >= HB_PLL_VCO_MIN_FREQ)
break;
}
vco_freq = rate * (1 << divq);
divf = (vco_freq + (ref_freq / 2)) / ref_freq;
divf--;
*pdivq = divq;
*pdivf = divf;
}
static long clk_pll_round_rate(struct clk_hw *hwclk, unsigned long rate,
unsigned long *parent_rate)
{
u32 divq, divf;
unsigned long ref_freq = *parent_rate;
clk_pll_calc(rate, ref_freq, &divq, &divf);
return (ref_freq * (divf + 1)) / (1 << divq);
}
static int clk_pll_set_rate(struct clk_hw *hwclk, unsigned long rate,
unsigned long parent_rate)
{
struct hb_clk *hbclk = to_hb_clk(hwclk);
u32 divq, divf;
u32 reg;
clk_pll_calc(rate, parent_rate, &divq, &divf);
reg = readl(hbclk->reg);
if (divf != ((reg & HB_PLL_DIVF_MASK) >> HB_PLL_DIVF_SHIFT)) {
/* Need to re-lock PLL, so put it into bypass mode */
reg |= HB_PLL_EXT_BYPASS;
writel(reg | HB_PLL_EXT_BYPASS, hbclk->reg);
writel(reg | HB_PLL_RESET, hbclk->reg);
reg &= ~(HB_PLL_DIVF_MASK | HB_PLL_DIVQ_MASK);
reg |= (divf << HB_PLL_DIVF_SHIFT) | (divq << HB_PLL_DIVQ_SHIFT);
writel(reg | HB_PLL_RESET, hbclk->reg);
writel(reg, hbclk->reg);
while ((readl(hbclk->reg) & HB_PLL_LOCK) == 0)
;
while ((readl(hbclk->reg) & HB_PLL_LOCK_500) == 0)
;
reg |= HB_PLL_EXT_ENA;
reg &= ~HB_PLL_EXT_BYPASS;
} else {
reg &= ~HB_PLL_DIVQ_MASK;
reg |= divq << HB_PLL_DIVQ_SHIFT;
}
writel(reg, hbclk->reg);
return 0;
}
static const struct clk_ops clk_pll_ops = {
.prepare = clk_pll_prepare,
.unprepare = clk_pll_unprepare,
.enable = clk_pll_enable,
.disable = clk_pll_disable,
.recalc_rate = clk_pll_recalc_rate,
.round_rate = clk_pll_round_rate,
.set_rate = clk_pll_set_rate,
};
static unsigned long clk_cpu_periphclk_recalc_rate(struct clk_hw *hwclk,
unsigned long parent_rate)
{
struct hb_clk *hbclk = to_hb_clk(hwclk);
u32 div = (readl(hbclk->reg) & HB_A9_PCLK_DIV) ? 8 : 4;
return parent_rate / div;
}
static const struct clk_ops a9periphclk_ops = {
.recalc_rate = clk_cpu_periphclk_recalc_rate,
};
static unsigned long clk_cpu_a9bclk_recalc_rate(struct clk_hw *hwclk,
unsigned long parent_rate)
{
struct hb_clk *hbclk = to_hb_clk(hwclk);
u32 div = (readl(hbclk->reg) & HB_A9_BCLK_DIV_MASK) >> HB_A9_BCLK_DIV_SHIFT;
return parent_rate / (div + 2);
}
static const struct clk_ops a9bclk_ops = {
.recalc_rate = clk_cpu_a9bclk_recalc_rate,
};
static unsigned long clk_periclk_recalc_rate(struct clk_hw *hwclk,
unsigned long parent_rate)
{
struct hb_clk *hbclk = to_hb_clk(hwclk);
u32 div;
div = readl(hbclk->reg) & 0x1f;
div++;
div *= 2;
return parent_rate / div;
}
static long clk_periclk_round_rate(struct clk_hw *hwclk, unsigned long rate,
unsigned long *parent_rate)
{
u32 div;
div = *parent_rate / rate;
div++;
div &= ~0x1;
return *parent_rate / div;
}
static int clk_periclk_set_rate(struct clk_hw *hwclk, unsigned long rate,
unsigned long parent_rate)
{
struct hb_clk *hbclk = to_hb_clk(hwclk);
u32 div;
div = parent_rate / rate;
if (div & 0x1)
return -EINVAL;
writel(div >> 1, hbclk->reg);
return 0;
}
static const struct clk_ops periclk_ops = {
.recalc_rate = clk_periclk_recalc_rate,
.round_rate = clk_periclk_round_rate,
.set_rate = clk_periclk_set_rate,
};
static __init struct clk *hb_clk_init(struct device_node *node, const struct clk_ops *ops)
{
u32 reg;
struct clk *clk;
struct hb_clk *hb_clk;
const char *clk_name = node->name;
const char *parent_name;
struct clk_init_data init;
int rc;
rc = of_property_read_u32(node, "reg", &reg);
if (WARN_ON(rc))
return NULL;
hb_clk = kzalloc(sizeof(*hb_clk), GFP_KERNEL);
if (WARN_ON(!hb_clk))
return NULL;
hb_clk->reg = sregs_base + reg;
of_property_read_string(node, "clock-output-names", &clk_name);
init.name = clk_name;
init.ops = ops;
init.flags = 0;
parent_name = of_clk_get_parent_name(node, 0);
init.parent_names = &parent_name;
init.num_parents = 1;
hb_clk->hw.init = &init;
clk = clk_register(NULL, &hb_clk->hw);
if (WARN_ON(IS_ERR(clk))) {
kfree(hb_clk);
return NULL;
}
rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
return clk;
}
static void __init hb_pll_init(struct device_node *node)
{
hb_clk_init(node, &clk_pll_ops);
}
static void __init hb_a9periph_init(struct device_node *node)
{
hb_clk_init(node, &a9periphclk_ops);
}
static void __init hb_a9bus_init(struct device_node *node)
{
struct clk *clk = hb_clk_init(node, &a9bclk_ops);
clk_prepare_enable(clk);
}
static void __init hb_emmc_init(struct device_node *node)
{
hb_clk_init(node, &periclk_ops);
}
static const __initconst struct of_device_id clk_match[] = {
{ .compatible = "fixed-clock", .data = of_fixed_clk_setup, },
{ .compatible = "calxeda,hb-pll-clock", .data = hb_pll_init, },
{ .compatible = "calxeda,hb-a9periph-clock", .data = hb_a9periph_init, },
{ .compatible = "calxeda,hb-a9bus-clock", .data = hb_a9bus_init, },
{ .compatible = "calxeda,hb-emmc-clock", .data = hb_emmc_init, },
{}
};
void __init highbank_clocks_init(void)
{
of_clk_init(clk_match);
}