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MIPS,clk: migrate JZ4740 to common clock framework

Browse Source 
Migrate the JZ4740 & the qi_lb60 board to use common clock framework
via the new Ingenic SoC CGU driver. Note that the JZ4740-specific
debugfs code is removed since common clock framework provides its own
debug capabilities.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Co-authored-by: Paul Cercueil <paul@crapouillou.net>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: devicetree@vger.kernel.org
Cc: linux-clk@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: Fabian Frederick <fabf@skynet.be>
Cc: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: linux-kernel@vger.kernel.org
Cc: Brian Norris <computersforpeace@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/10151/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2015-05-24 16:11:36 +01:00 committed by Ralf Baechle
parent b066303fb3
commit ff1930c6bd
11 changed files with 255 additions and 968 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/mips/Kconfig
View File

@ -298,7 +298,7 @@ config MACH_INGENIC
select IRQ_MIPS_CPU
select ARCH_REQUIRE_GPIOLIB
select SYS_HAS_EARLY_PRINTK
select HAVE_CLK
select COMMON_CLK
select GENERIC_IRQ_CHIP
select BUILTIN_DTB
select USE_OF

23
arch/mips/boot/dts/ingenic/jz4740.dtsi
View File

@ -1,3 +1,5 @@
#include <dt-bindings/clock/jz4740-cgu.h>
/ {
#address-cells = <1>;
#size-cells = <1>;
@ -20,4 +22,25 @@
interrupt-parent = <&cpuintc>;
interrupts = <2>;
};
ext: ext {
compatible = "fixed-clock";
#clock-cells = <0>;
};
rtc: rtc {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <32768>;
};
cgu: jz4740-cgu@10000000 {
compatible = "ingenic,jz4740-cgu";
reg = <0x10000000 0x100>;
clocks = <&ext>, <&rtc>;
clock-names = "ext", "rtc";
#clock-cells = <1>;
};
};

4
arch/mips/boot/dts/ingenic/qi_lb60.dts
View File

@ -5,3 +5,7 @@
/ {
compatible = "qi,lb60", "ingenic,jz4740";
};
&ext {
clock-frequency = <12000000>;
};

2
arch/mips/jz4740/Makefile
View File

@ -7,8 +7,6 @@
obj-y += prom.o time.o reset.o setup.o \
gpio.o clock.o platform.o timer.o serial.o
obj-$(CONFIG_DEBUG_FS) += clock-debugfs.o
# board specific support
obj-$(CONFIG_JZ4740_QI_LB60) += board-qi_lb60.o

5
arch/mips/jz4740/board-qi_lb60.c
View File

@ -497,11 +497,6 @@ static int __init qi_lb60_init_platform_devices(void)
}
struct jz4740_clock_board_data jz4740_clock_bdata = {
.ext_rate = 12000000,
.rtc_rate = 32768,
};
static __init int board_avt2(char *str)
{
qi_lb60_mmc_pdata.card_detect_active_low = 1;

108
arch/mips/jz4740/clock-debugfs.c
View File

@ -1,108 +0,0 @@
/*
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 SoC clock support debugfs entries
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <asm/mach-jz4740/clock.h>
#include "clock.h"
static struct dentry *jz4740_clock_debugfs;
static int jz4740_clock_debugfs_show_enabled(void *data, uint64_t *value)
{
struct clk *clk = data;
*value = clk_is_enabled(clk);
return 0;
}
static int jz4740_clock_debugfs_set_enabled(void *data, uint64_t value)
{
struct clk *clk = data;
if (value)
return clk_enable(clk);
else
clk_disable(clk);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_enabled,
jz4740_clock_debugfs_show_enabled,
jz4740_clock_debugfs_set_enabled,
"%llu\n");
static int jz4740_clock_debugfs_show_rate(void *data, uint64_t *value)
{
struct clk *clk = data;
*value = clk_get_rate(clk);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_rate,
jz4740_clock_debugfs_show_rate,
NULL,
"%llu\n");
void jz4740_clock_debugfs_add_clk(struct clk *clk)
{
if (!jz4740_clock_debugfs)
return;
clk->debugfs_entry = debugfs_create_dir(clk->name, jz4740_clock_debugfs);
debugfs_create_file("rate", S_IWUGO | S_IRUGO, clk->debugfs_entry, clk,
&jz4740_clock_debugfs_ops_rate);
debugfs_create_file("enabled", S_IRUGO, clk->debugfs_entry, clk,
&jz4740_clock_debugfs_ops_enabled);
if (clk->parent) {
char parent_path[100];
snprintf(parent_path, 100, "../%s", clk->parent->name);
clk->debugfs_parent_entry = debugfs_create_symlink("parent",
clk->debugfs_entry,
parent_path);
}
}
/* TODO: Locking */
void jz4740_clock_debugfs_update_parent(struct clk *clk)
{
debugfs_remove(clk->debugfs_parent_entry);
if (clk->parent) {
char parent_path[100];
snprintf(parent_path, 100, "../%s", clk->parent->name);
clk->debugfs_parent_entry = debugfs_create_symlink("parent",
clk->debugfs_entry,
parent_path);
} else {
clk->debugfs_parent_entry = NULL;
}
}
void jz4740_clock_debugfs_init(void)
{
jz4740_clock_debugfs = debugfs_create_dir("jz4740-clock", NULL);
if (IS_ERR(jz4740_clock_debugfs))
jz4740_clock_debugfs = NULL;
}

801
arch/mips/jz4740/clock.c
View File

@ -16,6 +16,7 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/module.h>
@ -27,820 +28,44 @@
#include "clock.h"
#define JZ_REG_CLOCK_CTRL 0x00
#define JZ_REG_CLOCK_LOW_POWER 0x04
#define JZ_REG_CLOCK_PLL 0x10
#define JZ_REG_CLOCK_GATE 0x20
#define JZ_REG_CLOCK_SLEEP_CTRL 0x24
#define JZ_REG_CLOCK_I2S 0x60
#define JZ_REG_CLOCK_LCD 0x64
#define JZ_REG_CLOCK_MMC 0x68
#define JZ_REG_CLOCK_UHC 0x6C
#define JZ_REG_CLOCK_SPI 0x74
#define JZ_CLOCK_CTRL_I2S_SRC_PLL BIT(31)
#define JZ_CLOCK_CTRL_KO_ENABLE BIT(30)
#define JZ_CLOCK_CTRL_UDC_SRC_PLL BIT(29)
#define JZ_CLOCK_CTRL_UDIV_MASK 0x1f800000
#define JZ_CLOCK_CTRL_CHANGE_ENABLE BIT(22)
#define JZ_CLOCK_CTRL_PLL_HALF BIT(21)
#define JZ_CLOCK_CTRL_LDIV_MASK 0x001f0000
#define JZ_CLOCK_CTRL_UDIV_OFFSET 23
#define JZ_CLOCK_CTRL_LDIV_OFFSET 16
#define JZ_CLOCK_CTRL_MDIV_OFFSET 12
#define JZ_CLOCK_CTRL_PDIV_OFFSET 8
#define JZ_CLOCK_CTRL_HDIV_OFFSET 4
#define JZ_CLOCK_CTRL_CDIV_OFFSET 0
#define JZ_CLOCK_GATE_UART0 BIT(0)
#define JZ_CLOCK_GATE_TCU BIT(1)
#define JZ_CLOCK_GATE_RTC BIT(2)
#define JZ_CLOCK_GATE_I2C BIT(3)
#define JZ_CLOCK_GATE_SPI BIT(4)
#define JZ_CLOCK_GATE_AIC BIT(5)
#define JZ_CLOCK_GATE_I2S BIT(6)
#define JZ_CLOCK_GATE_MMC BIT(7)
#define JZ_CLOCK_GATE_ADC BIT(8)
#define JZ_CLOCK_GATE_CIM BIT(9)
#define JZ_CLOCK_GATE_LCD BIT(10)
#define JZ_CLOCK_GATE_UDC BIT(11)
#define JZ_CLOCK_GATE_DMAC BIT(12)
#define JZ_CLOCK_GATE_IPU BIT(13)
#define JZ_CLOCK_GATE_UHC BIT(14)
#define JZ_CLOCK_GATE_UART1 BIT(15)
#define JZ_CLOCK_I2S_DIV_MASK 0x01ff
#define JZ_CLOCK_LCD_DIV_MASK 0x01ff
#define JZ_CLOCK_MMC_DIV_MASK 0x001f
#define JZ_CLOCK_UHC_DIV_MASK 0x000f
#define JZ_CLOCK_SPI_SRC_PLL BIT(31)
#define JZ_CLOCK_SPI_DIV_MASK 0x000f
#define JZ_CLOCK_PLL_M_MASK 0x01ff
#define JZ_CLOCK_PLL_N_MASK 0x001f
#define JZ_CLOCK_PLL_OD_MASK 0x0003
#define JZ_CLOCK_PLL_STABLE BIT(10)
#define JZ_CLOCK_PLL_BYPASS BIT(9)
#define JZ_CLOCK_PLL_ENABLED BIT(8)
#define JZ_CLOCK_PLL_STABLIZE_MASK 0x000f
#define JZ_CLOCK_PLL_M_OFFSET 23
#define JZ_CLOCK_PLL_N_OFFSET 18
#define JZ_CLOCK_PLL_OD_OFFSET 16
#define JZ_CLOCK_LOW_POWER_MODE_DOZE BIT(2)
#define JZ_CLOCK_LOW_POWER_MODE_SLEEP BIT(0)
#define JZ_CLOCK_SLEEP_CTRL_SUSPEND_UHC BIT(7)
#define JZ_CLOCK_SLEEP_CTRL_ENABLE_UDC BIT(6)
static void __iomem *jz_clock_base;
static spinlock_t jz_clock_lock;
static LIST_HEAD(jz_clocks);
struct main_clk {
struct clk clk;
uint32_t div_offset;
};
struct divided_clk {
struct clk clk;
uint32_t reg;
uint32_t mask;
};
struct static_clk {
struct clk clk;
unsigned long rate;
};
static uint32_t jz_clk_reg_read(int reg)
{
return readl(jz_clock_base + reg);
}
static void jz_clk_reg_write_mask(int reg, uint32_t val, uint32_t mask)
{
uint32_t val2;
spin_lock(&jz_clock_lock);
val2 = readl(jz_clock_base + reg);
val2 &= ~mask;
val2 |= val;
writel(val2, jz_clock_base + reg);
spin_unlock(&jz_clock_lock);
}
static void jz_clk_reg_set_bits(int reg, uint32_t mask)
{
uint32_t val;
spin_lock(&jz_clock_lock);
val = readl(jz_clock_base + reg);
val |= mask;
writel(val, jz_clock_base + reg);
spin_unlock(&jz_clock_lock);
}
static void jz_clk_reg_clear_bits(int reg, uint32_t mask)
{
uint32_t val;
spin_lock(&jz_clock_lock);
val = readl(jz_clock_base + reg);
val &= ~mask;
writel(val, jz_clock_base + reg);
spin_unlock(&jz_clock_lock);
}
static int jz_clk_enable_gating(struct clk *clk)
{
if (clk->gate_bit == JZ4740_CLK_NOT_GATED)
return -EINVAL;
jz_clk_reg_clear_bits(JZ_REG_CLOCK_GATE, clk->gate_bit);
return 0;
}
static int jz_clk_disable_gating(struct clk *clk)
{
if (clk->gate_bit == JZ4740_CLK_NOT_GATED)
return -EINVAL;
jz_clk_reg_set_bits(JZ_REG_CLOCK_GATE, clk->gate_bit);
return 0;
}
static int jz_clk_is_enabled_gating(struct clk *clk)
{
if (clk->gate_bit == JZ4740_CLK_NOT_GATED)
return 1;
return !(jz_clk_reg_read(JZ_REG_CLOCK_GATE) & clk->gate_bit);
}
static unsigned long jz_clk_static_get_rate(struct clk *clk)
{
return ((struct static_clk *)clk)->rate;
}
static int jz_clk_ko_enable(struct clk *clk)
{
jz_clk_reg_set_bits(JZ_REG_CLOCK_CTRL, JZ_CLOCK_CTRL_KO_ENABLE);
return 0;
}
static int jz_clk_ko_disable(struct clk *clk)
{
jz_clk_reg_clear_bits(JZ_REG_CLOCK_CTRL, JZ_CLOCK_CTRL_KO_ENABLE);
return 0;
}
static int jz_clk_ko_is_enabled(struct clk *clk)
{
return !!(jz_clk_reg_read(JZ_REG_CLOCK_CTRL) & JZ_CLOCK_CTRL_KO_ENABLE);
}
static const int pllno[] = {1, 2, 2, 4};
static unsigned long jz_clk_pll_get_rate(struct clk *clk)
{
uint32_t val;
int m;
int n;
int od;
val = jz_clk_reg_read(JZ_REG_CLOCK_PLL);
if (val & JZ_CLOCK_PLL_BYPASS)
return clk_get_rate(clk->parent);
m = ((val >> 23) & 0x1ff) + 2;
n = ((val >> 18) & 0x1f) + 2;
od = (val >> 16) & 0x3;
return ((clk_get_rate(clk->parent) / n) * m) / pllno[od];
}
static unsigned long jz_clk_pll_half_get_rate(struct clk *clk)
{
uint32_t reg;
reg = jz_clk_reg_read(JZ_REG_CLOCK_CTRL);
if (reg & JZ_CLOCK_CTRL_PLL_HALF)
return jz_clk_pll_get_rate(clk->parent);
return jz_clk_pll_get_rate(clk->parent) >> 1;
}
static const int jz_clk_main_divs[] = {1, 2, 3, 4, 6, 8, 12, 16, 24, 32};
static unsigned long jz_clk_main_round_rate(struct clk *clk, unsigned long rate)
{
unsigned long parent_rate = jz_clk_pll_get_rate(clk->parent);
int div;
div = parent_rate / rate;
if (div > 32)
return parent_rate / 32;
else if (div < 1)
return parent_rate;
div &= (0x3 << (ffs(div) - 1));
return parent_rate / div;
}
static unsigned long jz_clk_main_get_rate(struct clk *clk)
{
struct main_clk *mclk = (struct main_clk *)clk;
uint32_t div;
div = jz_clk_reg_read(JZ_REG_CLOCK_CTRL);
div >>= mclk->div_offset;
div &= 0xf;
if (div >= ARRAY_SIZE(jz_clk_main_divs))
div = ARRAY_SIZE(jz_clk_main_divs) - 1;
return jz_clk_pll_get_rate(clk->parent) / jz_clk_main_divs[div];
}
static int jz_clk_main_set_rate(struct clk *clk, unsigned long rate)
{
struct main_clk *mclk = (struct main_clk *)clk;
int i;
int div;
unsigned long parent_rate = jz_clk_pll_get_rate(clk->parent);
rate = jz_clk_main_round_rate(clk, rate);
div = parent_rate / rate;
i = (ffs(div) - 1) << 1;
if (i > 0 && !(div & BIT(i-1)))
i -= 1;
jz_clk_reg_write_mask(JZ_REG_CLOCK_CTRL, i << mclk->div_offset,
0xf << mclk->div_offset);
return 0;
}
static struct clk_ops jz_clk_static_ops = {
.get_rate = jz_clk_static_get_rate,
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
};
static struct static_clk jz_clk_ext = {
.clk = {
.name = "ext",
.gate_bit = JZ4740_CLK_NOT_GATED,
.ops = &jz_clk_static_ops,
},
};
static struct clk_ops jz_clk_pll_ops = {
.get_rate = jz_clk_pll_get_rate,
};
static struct clk jz_clk_pll = {
.name = "pll",
.parent = &jz_clk_ext.clk,
.ops = &jz_clk_pll_ops,
};
static struct clk_ops jz_clk_pll_half_ops = {
.get_rate = jz_clk_pll_half_get_rate,
};
static struct clk jz_clk_pll_half = {
.name = "pll half",
.parent = &jz_clk_pll,
.ops = &jz_clk_pll_half_ops,
};
static const struct clk_ops jz_clk_main_ops = {
.get_rate = jz_clk_main_get_rate,
.set_rate = jz_clk_main_set_rate,
.round_rate = jz_clk_main_round_rate,
};
static struct main_clk jz_clk_cpu = {
.clk = {
.name = "cclk",
.parent = &jz_clk_pll,
.ops = &jz_clk_main_ops,
},
.div_offset = JZ_CLOCK_CTRL_CDIV_OFFSET,
};
static struct main_clk jz_clk_memory = {
.clk = {
.name = "mclk",
.parent = &jz_clk_pll,
.ops = &jz_clk_main_ops,
},
.div_offset = JZ_CLOCK_CTRL_MDIV_OFFSET,
};
static struct main_clk jz_clk_high_speed_peripheral = {
.clk = {
.name = "hclk",
.parent = &jz_clk_pll,
.ops = &jz_clk_main_ops,
},
.div_offset = JZ_CLOCK_CTRL_HDIV_OFFSET,
};
static struct main_clk jz_clk_low_speed_peripheral = {
.clk = {
.name = "pclk",
.parent = &jz_clk_pll,
.ops = &jz_clk_main_ops,
},
.div_offset = JZ_CLOCK_CTRL_PDIV_OFFSET,
};
static const struct clk_ops jz_clk_ko_ops = {
.enable = jz_clk_ko_enable,
.disable = jz_clk_ko_disable,
.is_enabled = jz_clk_ko_is_enabled,
};
static struct clk jz_clk_ko = {
.name = "cko",
.parent = &jz_clk_memory.clk,
.ops = &jz_clk_ko_ops,
};
static int jz_clk_spi_set_parent(struct clk *clk, struct clk *parent)
{
if (parent == &jz_clk_pll)
jz_clk_reg_set_bits(JZ_CLOCK_SPI_SRC_PLL, JZ_REG_CLOCK_SPI);
else if (parent == &jz_clk_ext.clk)
jz_clk_reg_clear_bits(JZ_CLOCK_SPI_SRC_PLL, JZ_REG_CLOCK_SPI);
else
return -EINVAL;
clk->parent = parent;
return 0;
}
static int jz_clk_i2s_set_parent(struct clk *clk, struct clk *parent)
{
if (parent == &jz_clk_pll_half)
jz_clk_reg_set_bits(JZ_REG_CLOCK_CTRL, JZ_CLOCK_CTRL_I2S_SRC_PLL);
else if (parent == &jz_clk_ext.clk)
jz_clk_reg_clear_bits(JZ_REG_CLOCK_CTRL, JZ_CLOCK_CTRL_I2S_SRC_PLL);
else
return -EINVAL;
clk->parent = parent;
return 0;
}
static int jz_clk_udc_enable(struct clk *clk)
{
jz_clk_reg_set_bits(JZ_REG_CLOCK_SLEEP_CTRL,
JZ_CLOCK_SLEEP_CTRL_ENABLE_UDC);
return 0;
}
static int jz_clk_udc_disable(struct clk *clk)
{
jz_clk_reg_clear_bits(JZ_REG_CLOCK_SLEEP_CTRL,
JZ_CLOCK_SLEEP_CTRL_ENABLE_UDC);
return 0;
}
static int jz_clk_udc_is_enabled(struct clk *clk)
{
return !!(jz_clk_reg_read(JZ_REG_CLOCK_SLEEP_CTRL) &
JZ_CLOCK_SLEEP_CTRL_ENABLE_UDC);
}
static int jz_clk_udc_set_parent(struct clk *clk, struct clk *parent)
{
if (parent == &jz_clk_pll_half)
jz_clk_reg_set_bits(JZ_REG_CLOCK_CTRL, JZ_CLOCK_CTRL_UDC_SRC_PLL);
else if (parent == &jz_clk_ext.clk)
jz_clk_reg_clear_bits(JZ_REG_CLOCK_CTRL, JZ_CLOCK_CTRL_UDC_SRC_PLL);
else
return -EINVAL;
clk->parent = parent;
return 0;
}
static int jz_clk_udc_set_rate(struct clk *clk, unsigned long rate)
{
int div;
if (clk->parent == &jz_clk_ext.clk)
return -EINVAL;
div = clk_get_rate(clk->parent) / rate - 1;
if (div < 0)
div = 0;
else if (div > 63)
div = 63;
jz_clk_reg_write_mask(JZ_REG_CLOCK_CTRL, div << JZ_CLOCK_CTRL_UDIV_OFFSET,
JZ_CLOCK_CTRL_UDIV_MASK);
return 0;
}
static unsigned long jz_clk_udc_get_rate(struct clk *clk)
{
int div;
if (clk->parent == &jz_clk_ext.clk)
return clk_get_rate(clk->parent);
div = (jz_clk_reg_read(JZ_REG_CLOCK_CTRL) & JZ_CLOCK_CTRL_UDIV_MASK);
div >>= JZ_CLOCK_CTRL_UDIV_OFFSET;
div += 1;
return clk_get_rate(clk->parent) / div;
}
static unsigned long jz_clk_divided_get_rate(struct clk *clk)
{
struct divided_clk *dclk = (struct divided_clk *)clk;
int div;
if (clk->parent == &jz_clk_ext.clk)
return clk_get_rate(clk->parent);
div = (jz_clk_reg_read(dclk->reg) & dclk->mask) + 1;
return clk_get_rate(clk->parent) / div;
}
static int jz_clk_divided_set_rate(struct clk *clk, unsigned long rate)
{
struct divided_clk *dclk = (struct divided_clk *)clk;
int div;
if (clk->parent == &jz_clk_ext.clk)
return -EINVAL;
div = clk_get_rate(clk->parent) / rate - 1;
if (div < 0)
div = 0;
else if (div > dclk->mask)
div = dclk->mask;
jz_clk_reg_write_mask(dclk->reg, div, dclk->mask);
return 0;
}
static unsigned long jz_clk_ldclk_round_rate(struct clk *clk, unsigned long rate)
{
int div;
unsigned long parent_rate = jz_clk_pll_half_get_rate(clk->parent);
if (rate > 150000000)
return 150000000;
div = parent_rate / rate;
if (div < 1)
div = 1;
else if (div > 32)
div = 32;
return parent_rate / div;
}
static int jz_clk_ldclk_set_rate(struct clk *clk, unsigned long rate)
{
int div;
if (rate > 150000000)
return -EINVAL;
div = jz_clk_pll_half_get_rate(clk->parent) / rate - 1;
if (div < 0)
div = 0;
else if (div > 31)
div = 31;
jz_clk_reg_write_mask(JZ_REG_CLOCK_CTRL, div << JZ_CLOCK_CTRL_LDIV_OFFSET,
JZ_CLOCK_CTRL_LDIV_MASK);
return 0;
}
static unsigned long jz_clk_ldclk_get_rate(struct clk *clk)
{
int div;
div = jz_clk_reg_read(JZ_REG_CLOCK_CTRL) & JZ_CLOCK_CTRL_LDIV_MASK;
div >>= JZ_CLOCK_CTRL_LDIV_OFFSET;
return jz_clk_pll_half_get_rate(clk->parent) / (div + 1);
}
static const struct clk_ops jz_clk_ops_ld = {
.set_rate = jz_clk_ldclk_set_rate,
.get_rate = jz_clk_ldclk_get_rate,
.round_rate = jz_clk_ldclk_round_rate,
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
};
static struct clk jz_clk_ld = {
.name = "lcd",
.gate_bit = JZ_CLOCK_GATE_LCD,
.parent = &jz_clk_pll_half,
.ops = &jz_clk_ops_ld,
};
static const struct clk_ops jz_clk_i2s_ops = {
.set_rate = jz_clk_divided_set_rate,
.get_rate = jz_clk_divided_get_rate,
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
.set_parent = jz_clk_i2s_set_parent,
};
static const struct clk_ops jz_clk_spi_ops = {
.set_rate = jz_clk_divided_set_rate,
.get_rate = jz_clk_divided_get_rate,
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
.set_parent = jz_clk_spi_set_parent,
};
static const struct clk_ops jz_clk_divided_ops = {
.set_rate = jz_clk_divided_set_rate,
.get_rate = jz_clk_divided_get_rate,
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
};
static struct divided_clk jz4740_clock_divided_clks[] = {
[0] = {
.clk = {
.name = "i2s",
.parent = &jz_clk_ext.clk,
.gate_bit = JZ_CLOCK_GATE_I2S,
.ops = &jz_clk_i2s_ops,
},
.reg = JZ_REG_CLOCK_I2S,
.mask = JZ_CLOCK_I2S_DIV_MASK,
},
[1] = {
.clk = {
.name = "spi",
.parent = &jz_clk_ext.clk,
.gate_bit = JZ_CLOCK_GATE_SPI,
.ops = &jz_clk_spi_ops,
},
.reg = JZ_REG_CLOCK_SPI,
.mask = JZ_CLOCK_SPI_DIV_MASK,
},
[2] = {
.clk = {
.name = "lcd_pclk",
.parent = &jz_clk_pll_half,
.gate_bit = JZ4740_CLK_NOT_GATED,
.ops = &jz_clk_divided_ops,
},
.reg = JZ_REG_CLOCK_LCD,
.mask = JZ_CLOCK_LCD_DIV_MASK,
},
[3] = {
.clk = {
.name = "mmc",
.parent = &jz_clk_pll_half,
.gate_bit = JZ_CLOCK_GATE_MMC,
.ops = &jz_clk_divided_ops,
},
.reg = JZ_REG_CLOCK_MMC,
.mask = JZ_CLOCK_MMC_DIV_MASK,
},
[4] = {
.clk = {
.name = "uhc",
.parent = &jz_clk_pll_half,
.gate_bit = JZ_CLOCK_GATE_UHC,
.ops = &jz_clk_divided_ops,
},
.reg = JZ_REG_CLOCK_UHC,
.mask = JZ_CLOCK_UHC_DIV_MASK,
},
};
static const struct clk_ops jz_clk_udc_ops = {
.set_parent = jz_clk_udc_set_parent,
.set_rate = jz_clk_udc_set_rate,
.get_rate = jz_clk_udc_get_rate,
.enable = jz_clk_udc_enable,
.disable = jz_clk_udc_disable,
.is_enabled = jz_clk_udc_is_enabled,
};
static const struct clk_ops jz_clk_simple_ops = {
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
};
static struct clk jz4740_clock_simple_clks[] = {
[0] = {
.name = "udc",
.parent = &jz_clk_ext.clk,
.ops = &jz_clk_udc_ops,
},
[1] = {
.name = "uart0",
.parent = &jz_clk_ext.clk,
.gate_bit = JZ_CLOCK_GATE_UART0,
.ops = &jz_clk_simple_ops,
},
[2] = {
.name = "uart1",
.parent = &jz_clk_ext.clk,
.gate_bit = JZ_CLOCK_GATE_UART1,
.ops = &jz_clk_simple_ops,
},
[3] = {
.name = "dma",
.parent = &jz_clk_high_speed_peripheral.clk,
.gate_bit = JZ_CLOCK_GATE_DMAC,
.ops = &jz_clk_simple_ops,
},
[4] = {
.name = "ipu",
.parent = &jz_clk_high_speed_peripheral.clk,
.gate_bit = JZ_CLOCK_GATE_IPU,
.ops = &jz_clk_simple_ops,
},
[5] = {
.name = "adc",
.parent = &jz_clk_ext.clk,
.gate_bit = JZ_CLOCK_GATE_ADC,
.ops = &jz_clk_simple_ops,
},
[6] = {
.name = "i2c",
.parent = &jz_clk_ext.clk,
.gate_bit = JZ_CLOCK_GATE_I2C,
.ops = &jz_clk_simple_ops,
},
[7] = {
.name = "aic",
.parent = &jz_clk_ext.clk,
.gate_bit = JZ_CLOCK_GATE_AIC,
.ops = &jz_clk_simple_ops,
},
};
static struct static_clk jz_clk_rtc = {
.clk = {
.name = "rtc",
.gate_bit = JZ_CLOCK_GATE_RTC,
.ops = &jz_clk_static_ops,
},
.rate = 32768,
};
int clk_enable(struct clk *clk)
{
if (!clk->ops->enable)
return -EINVAL;
return clk->ops->enable(clk);
}
EXPORT_SYMBOL_GPL(clk_enable);
void clk_disable(struct clk *clk)
{
if (clk->ops->disable)
clk->ops->disable(clk);
}
EXPORT_SYMBOL_GPL(clk_disable);
int clk_is_enabled(struct clk *clk)
{
if (clk->ops->is_enabled)
return clk->ops->is_enabled(clk);
return 1;
}
unsigned long clk_get_rate(struct clk *clk)
{
if (clk->ops->get_rate)
return clk->ops->get_rate(clk);
if (clk->parent)
return clk_get_rate(clk->parent);
return -EINVAL;
}
EXPORT_SYMBOL_GPL(clk_get_rate);
int clk_set_rate(struct clk *clk, unsigned long rate)
{
if (!clk->ops->set_rate)
return -EINVAL;
return clk->ops->set_rate(clk, rate);
}
EXPORT_SYMBOL_GPL(clk_set_rate);
long clk_round_rate(struct clk *clk, unsigned long rate)
{
if (clk->ops->round_rate)
return clk->ops->round_rate(clk, rate);
return -EINVAL;
}
EXPORT_SYMBOL_GPL(clk_round_rate);
int clk_set_parent(struct clk *clk, struct clk *parent)
{
int ret;
int enabled;
if (!clk->ops->set_parent)
return -EINVAL;
enabled = clk_is_enabled(clk);
if (enabled)
clk_disable(clk);
ret = clk->ops->set_parent(clk, parent);
if (enabled)
clk_enable(clk);
jz4740_clock_debugfs_update_parent(clk);
return ret;
}
EXPORT_SYMBOL_GPL(clk_set_parent);
struct clk *clk_get(struct device *dev, const char *name)
{
struct clk *clk;
list_for_each_entry(clk, &jz_clocks, list) {
if (strcmp(clk->name, name) == 0)
return clk;
}
return ERR_PTR(-ENXIO);
}
EXPORT_SYMBOL_GPL(clk_get);
void clk_put(struct clk *clk)
{
}
EXPORT_SYMBOL_GPL(clk_put);
static inline void clk_add(struct clk *clk)
{
list_add_tail(&clk->list, &jz_clocks);
jz4740_clock_debugfs_add_clk(clk);
}
static void clk_register_clks(void)
{
size_t i;
clk_add(&jz_clk_ext.clk);
clk_add(&jz_clk_pll);
clk_add(&jz_clk_pll_half);
clk_add(&jz_clk_cpu.clk);
clk_add(&jz_clk_high_speed_peripheral.clk);
clk_add(&jz_clk_low_speed_peripheral.clk);
clk_add(&jz_clk_ko);
clk_add(&jz_clk_ld);
clk_add(&jz_clk_rtc.clk);
for (i = 0; i < ARRAY_SIZE(jz4740_clock_divided_clks); ++i)
clk_add(&jz4740_clock_divided_clks[i].clk);
for (i = 0; i < ARRAY_SIZE(jz4740_clock_simple_clks); ++i)
clk_add(&jz4740_clock_simple_clks[i]);
}
void jz4740_clock_set_wait_mode(enum jz4740_wait_mode mode)
@ -891,33 +116,9 @@ void jz4740_clock_resume(void)
int jz4740_clock_init(void)
{
uint32_t val;
jz_clock_base = ioremap(JZ4740_CPM_BASE_ADDR, 0x100);
if (!jz_clock_base)
return -EBUSY;
spin_lock_init(&jz_clock_lock);
jz_clk_ext.rate = jz4740_clock_bdata.ext_rate;
jz_clk_rtc.rate = jz4740_clock_bdata.rtc_rate;
val = jz_clk_reg_read(JZ_REG_CLOCK_SPI);
if (val & JZ_CLOCK_SPI_SRC_PLL)
jz4740_clock_divided_clks[1].clk.parent = &jz_clk_pll_half;
val = jz_clk_reg_read(JZ_REG_CLOCK_CTRL);
if (val & JZ_CLOCK_CTRL_I2S_SRC_PLL)
jz4740_clock_divided_clks[0].clk.parent = &jz_clk_pll_half;
if (val & JZ_CLOCK_CTRL_UDC_SRC_PLL)
jz4740_clock_simple_clks[0].parent = &jz_clk_pll_half;
jz4740_clock_debugfs_init();
clk_register_clks();
return 0;
}

53
arch/mips/jz4740/clock.h
View File

@ -16,61 +16,10 @@
#ifndef __MIPS_JZ4740_CLOCK_H__
#define __MIPS_JZ4740_CLOCK_H__
#include <linux/clk.h>
#include <linux/list.h>
struct jz4740_clock_board_data {
unsigned long ext_rate;
unsigned long rtc_rate;
};
extern struct jz4740_clock_board_data jz4740_clock_bdata;
void jz4740_clock_suspend(void);
void jz4740_clock_resume(void);
struct clk;
struct clk_ops {
unsigned long (*get_rate)(struct clk *clk);
unsigned long (*round_rate)(struct clk *clk, unsigned long rate);
int (*set_rate)(struct clk *clk, unsigned long rate);
int (*enable)(struct clk *clk);
int (*disable)(struct clk *clk);
int (*is_enabled)(struct clk *clk);
int (*set_parent)(struct clk *clk, struct clk *parent);
};
struct clk {
const char *name;
struct clk *parent;
uint32_t gate_bit;
const struct clk_ops *ops;
struct list_head list;
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs_entry;
struct dentry *debugfs_parent_entry;
#endif
};
#define JZ4740_CLK_NOT_GATED ((uint32_t)-1)
int clk_is_enabled(struct clk *clk);
#ifdef CONFIG_DEBUG_FS
void jz4740_clock_debugfs_init(void);
void jz4740_clock_debugfs_add_clk(struct clk *clk);
void jz4740_clock_debugfs_update_parent(struct clk *clk);
#else
static inline void jz4740_clock_debugfs_init(void) {};
static inline void jz4740_clock_debugfs_add_clk(struct clk *clk) {};
static inline void jz4740_clock_debugfs_update_parent(struct clk *clk) {};
#endif
#endif

2
arch/mips/jz4740/time.c
View File

@ -14,6 +14,7 @@
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/time.h>
@ -118,6 +119,7 @@ void __init plat_time_init(void)
uint16_t ctrl;
struct clk *ext_clk;
of_clk_init(NULL);
jz4740_clock_init();
jz4740_timer_init();

1
drivers/clk/ingenic/Makefile
View File

@ -1 +1,2 @@
obj-y += cgu.o
obj-$(CONFIG_MACH_JZ4740) += jz4740-cgu.o

222
drivers/clk/ingenic/jz4740-cgu.c Normal file
View File

@ -0,0 +1,222 @@
/*
* Ingenic JZ4740 SoC CGU driver
*
* Copyright (c) 2015 Imagination Technologies
* Author: Paul Burton <paul.burton@imgtec.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <dt-bindings/clock/jz4740-cgu.h>
#include "cgu.h"
/* CGU register offsets */
#define CGU_REG_CPCCR 0x00
#define CGU_REG_CPPCR 0x10
#define CGU_REG_SCR 0x24
#define CGU_REG_I2SCDR 0x60
#define CGU_REG_LPCDR 0x64
#define CGU_REG_MSCCDR 0x68
#define CGU_REG_UHCCDR 0x6c
#define CGU_REG_SSICDR 0x74
/* bits within a PLL control register */
#define PLLCTL_M_SHIFT 23
#define PLLCTL_M_MASK (0x1ff << PLLCTL_M_SHIFT)
#define PLLCTL_N_SHIFT 18
#define PLLCTL_N_MASK (0x1f << PLLCTL_N_SHIFT)
#define PLLCTL_OD_SHIFT 16
#define PLLCTL_OD_MASK (0x3 << PLLCTL_OD_SHIFT)
#define PLLCTL_STABLE (1 << 10)
#define PLLCTL_BYPASS (1 << 9)
#define PLLCTL_ENABLE (1 << 8)
static struct ingenic_cgu *cgu;
static const s8 pll_od_encoding[4] = {
0x0, 0x1, -1, 0x3,
};
static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
/* External clocks */
[JZ4740_CLK_EXT] = { "ext", CGU_CLK_EXT },
[JZ4740_CLK_RTC] = { "rtc", CGU_CLK_EXT },
[JZ4740_CLK_PLL] = {
"pll", CGU_CLK_PLL,
.parents = { JZ4740_CLK_EXT, -1, -1, -1 },
.pll = {
.reg = CGU_REG_CPPCR,
.m_shift = 23,
.m_bits = 9,
.m_offset = 2,
.n_shift = 18,
.n_bits = 5,
.n_offset = 2,
.od_shift = 16,
.od_bits = 2,
.od_max = 4,
.od_encoding = pll_od_encoding,
.stable_bit = 10,
.bypass_bit = 9,
.enable_bit = 8,
},
},
/* Muxes & dividers */
[JZ4740_CLK_PLL_HALF] = {
"pll half", CGU_CLK_DIV,
.parents = { JZ4740_CLK_PLL, -1, -1, -1 },
.div = { CGU_REG_CPCCR, 21, 1, -1, -1, -1 },
},
[JZ4740_CLK_CCLK] = {
"cclk", CGU_CLK_DIV,
.parents = { JZ4740_CLK_PLL, -1, -1, -1 },
.div = { CGU_REG_CPCCR, 0, 4, 22, -1, -1 },
},
[JZ4740_CLK_HCLK] = {
"hclk", CGU_CLK_DIV,
.parents = { JZ4740_CLK_PLL, -1, -1, -1 },
.div = { CGU_REG_CPCCR, 4, 4, 22, -1, -1 },
},
[JZ4740_CLK_PCLK] = {
"pclk", CGU_CLK_DIV,
.parents = { JZ4740_CLK_PLL, -1, -1, -1 },
.div = { CGU_REG_CPCCR, 8, 4, 22, -1, -1 },
},
[JZ4740_CLK_MCLK] = {
"mclk", CGU_CLK_DIV,
.parents = { JZ4740_CLK_PLL, -1, -1, -1 },
.div = { CGU_REG_CPCCR, 12, 4, 22, -1, -1 },
},
[JZ4740_CLK_LCD] = {
"lcd", CGU_CLK_DIV | CGU_CLK_GATE,
.parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
.div = { CGU_REG_CPCCR, 16, 5, 22, -1, -1 },
.gate = { CGU_REG_CLKGR, 10 },
},
[JZ4740_CLK_LCD_PCLK] = {
"lcd_pclk", CGU_CLK_DIV,
.parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
.div = { CGU_REG_LPCDR, 0, 11, -1, -1, -1 },
},
[JZ4740_CLK_I2S] = {
"i2s", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
.parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
.mux = { CGU_REG_CPCCR, 31, 1 },
.div = { CGU_REG_I2SCDR, 0, 8, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 6 },
},
[JZ4740_CLK_SPI] = {
"spi", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
.parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL, -1, -1 },
.mux = { CGU_REG_SSICDR, 31, 1 },
.div = { CGU_REG_SSICDR, 0, 4, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 4 },
},
[JZ4740_CLK_MMC] = {
"mmc", CGU_CLK_DIV | CGU_CLK_GATE,
.parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
.div = { CGU_REG_MSCCDR, 0, 5, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 7 },
},
[JZ4740_CLK_UHC] = {
"uhc", CGU_CLK_DIV | CGU_CLK_GATE,
.parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
.div = { CGU_REG_UHCCDR, 0, 4, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 14 },
},
[JZ4740_CLK_UDC] = {
"udc", CGU_CLK_MUX | CGU_CLK_DIV,
.parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
.mux = { CGU_REG_CPCCR, 29, 1 },
.div = { CGU_REG_CPCCR, 23, 6, -1, -1, -1 },
.gate = { CGU_REG_SCR, 6 },
},
/* Gate-only clocks */
[JZ4740_CLK_UART0] = {
"uart0", CGU_CLK_GATE,
.parents = { JZ4740_CLK_EXT, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 0 },
},
[JZ4740_CLK_UART1] = {
"uart1", CGU_CLK_GATE,
.parents = { JZ4740_CLK_EXT, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 15 },
},
[JZ4740_CLK_DMA] = {
"dma", CGU_CLK_GATE,
.parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 12 },
},
[JZ4740_CLK_IPU] = {
"ipu", CGU_CLK_GATE,
.parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 13 },
},
[JZ4740_CLK_ADC] = {
"adc", CGU_CLK_GATE,
.parents = { JZ4740_CLK_EXT, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 8 },
},
[JZ4740_CLK_I2C] = {
"i2c", CGU_CLK_GATE,
.parents = { JZ4740_CLK_EXT, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 3 },
},
[JZ4740_CLK_AIC] = {
"aic", CGU_CLK_GATE,
.parents = { JZ4740_CLK_EXT, -1, -1, -1 },
.gate = { CGU_REG_CLKGR, 5 },
},
};
static void __init jz4740_cgu_init(struct device_node *np)
{
int retval;
cgu = ingenic_cgu_new(jz4740_cgu_clocks,
ARRAY_SIZE(jz4740_cgu_clocks), np);
if (!cgu) {
pr_err("%s: failed to initialise CGU\n", __func__);
return;
}
retval = ingenic_cgu_register_clocks(cgu);
if (retval)
pr_err("%s: failed to register CGU Clocks\n", __func__);
}
CLK_OF_DECLARE(jz4740_cgu, "ingenic,jz4740-cgu", jz4740_cgu_init);