[PATCH v4 11/15] h8300: clock driver

Yoshinori Sato
2015-02-21T07:54:48Z

drivers/clk/Makefile | 1 +
drivers/clk/h8300/Makefile | 2 +
drivers/clk/h8300/clk-h83069.c | 74 ++++++++++++++++++
drivers/clk/h8300/clk-h8s2678.c | 165 ++++++++++++++++++++++++++++++++++++++++
include/linux/clk-provider.h | 12 +++
5 files changed, 254 insertions(+)
create mode 100644 drivers/clk/h8300/Makefile
create mode 100644 drivers/clk/h8300/clk-h83069.c
create mode 100644 drivers/clk/h8300/clk-h8s2678.c

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..37b6e87 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -68,3 +68,4 @@ obj-$(CONFIG_ARCH_U8500) += ux500/
obj-$(CONFIG_COMMON_CLK_VERSATILE) += versatile/
obj-$(CONFIG_X86) += x86/
obj-$(CONFIG_ARCH_ZYNQ) += zynq/
+obj-$(CONFIG_H8300) += h8300/
diff --git a/drivers/clk/h8300/Makefile b/drivers/clk/h8300/Makefile
new file mode 100644
index 0000000..82eab42
--- /dev/null
+++ b/drivers/clk/h8300/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_H83069) += clk-h83069.o
+obj-$(CONFIG_H8S2678) += clk-h8s2678.o
diff --git a/drivers/clk/h8300/clk-h83069.c b/drivers/clk/h8300/clk-h83069.c
new file mode 100644
index 0000000..8d1b915
--- /dev/null
+++ b/drivers/clk/h8300/clk-h83069.c
@@ -0,0 +1,74 @@
+/*
+ * H8/3069 clock driver
+ *
+ * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
+ */
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+
+static DEFINE_SPINLOCK(clklock);
+
+#define DIVCR ((unsigned char *)0xfee01b)
+#define DEVNAME "h83069-cpg"
+
+static int clk_probe(struct platform_device *pdev)
+{
+ struct clk *clk;
+ int *hz = dev_get_platdata(&pdev->dev);
+
+ clk = clk_register_fixed_rate(&pdev->dev, "master_clk", NULL,
+ CLK_IS_ROOT, *hz);
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "failed to register clock");
+ return PTR_ERR(clk);
+ }
+ clk_register_clkdev(clk, "master_clk", DEVNAME ".%d", 0);
+
+ clk = clk_register_divider(&pdev->dev, "core_clk", "master_clk",
+ CLK_SET_RATE_GATE, DIVCR, 0, 2,
+ CLK_DIVIDER_POWER_OF_TWO, &clklock);
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "failed to register clock");
+ return PTR_ERR(clk);
+ }
+ clk_register_clkdev(clk, "core_clk", DEVNAME ".%d", 0);
+
+ clk_add_alias("peripheral_clk", NULL, "core_clk", &pdev->dev);
+ return 0;
+}
+
+static struct platform_driver cpg_driver = {
+ .driver = {
+ .name = DEVNAME,
+ },
+ .probe = clk_probe,
+};
+
+early_platform_init(DEVNAME, &cpg_driver);
+
+static struct platform_device clk_device = {
+ .name = DEVNAME,
+ .id = 0,
+};
+
+static struct platform_device *devices[] __initdata = {
+ &clk_device,
+};
+
+int __init h8300_clk_init(int hz)
+{
+ static int master_hz;
+
+ master_hz = hz;
+ clk_device.dev.platform_data = &master_hz;
+ early_platform_add_devices(devices,
+ ARRAY_SIZE(devices));
+ early_platform_driver_register_all(DEVNAME);
+ early_platform_driver_probe(DEVNAME, 1, 0);
+ return 0;
+}
diff --git a/drivers/clk/h8300/clk-h8s2678.c b/drivers/clk/h8300/clk-h8s2678.c
new file mode 100644
index 0000000..e110cff
--- /dev/null
+++ b/drivers/clk/h8300/clk-h8s2678.c
@@ -0,0 +1,165 @@
+/*
+ * H8S2678 clock driver
+ *
+ * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
+ */
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+
+static DEFINE_SPINLOCK(clklock);
+
+#define SCKCR 0xffff3b
+#define PLLCR 0xffff45
+#define DEVNAME "h8s2679-cpg"
+#define MAX_FREQ 33333333
+#define MIN_FREQ 8000000
+
+static unsigned long pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ int mul = 1 << (ctrl_inb(PLLCR) & 3);
+
+ return parent_rate * mul;
+}
+
+static long pll_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ int i, m = -1;
+ long offset[3];
+
+ if (rate > MAX_FREQ)
+ rate = MAX_FREQ;
+ if (rate < MIN_FREQ)
+ rate = MIN_FREQ;
+
+ for (i = 0; i < 3; i++)
+ offset[i] = abs(rate - (*prate * (1 << i)));
+ for (i = 0; i < 3; i++)
+ if (m < 0)
+ m = i;
+ else
+ m = (offset[i] < offset[m])?i:m;
+
+ return *prate * (1 << m);
+}
+
+static int pll_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ int pll;
+ unsigned char val;
+ unsigned long flags;
+
+ pll = ((rate / parent_rate) / 2) & 0x03;
+ spin_lock_irqsave(&clklock, flags);
+ val = ctrl_inb(SCKCR);
+ val |= 0x08;
+ ctrl_outb(val, SCKCR);
+ val = ctrl_inb(PLLCR);
+ val &= ~0x03;
+ val |= pll;
+ ctrl_outb(val, PLLCR);
+ spin_unlock_irqrestore(&clklock, flags);
+ return 0;
+}
+
+static const struct clk_ops pll_ops = {
+ .recalc_rate = pll_recalc_rate,
+ .round_rate = pll_round_rate,
+ .set_rate = pll_set_rate,
+};
+
+static struct clk *pll_clk_register(struct device *dev, const char *name,
+ const char *parent)
+{
+ struct clk_hw *hw;
+ struct clk *clk;
+ struct clk_init_data init;
+
+ hw = kzalloc(sizeof(struct clk_hw), GFP_KERNEL);
+ if (!hw)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = name;
+ init.ops = &pll_ops;
+ init.flags = CLK_IS_BASIC;
+ init.parent_names = &parent;
+ init.num_parents = 1;
+ hw->init = &init;
+
+ clk = clk_register(dev, hw);
+ if (IS_ERR(clk))
+ kfree(hw);
+
+ return clk;
+}
+
+static int clk_probe(struct platform_device *pdev)
+{
+ struct clk *clk;
+ int *hz = dev_get_platdata(&pdev->dev);
+
+ clk = clk_register_fixed_rate(&pdev->dev, "master_clk", NULL,
+ CLK_IS_ROOT, *hz);
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "failed to register clock");
+ return PTR_ERR(clk);
+ }
+ clk_register_clkdev(clk, "master_clk", DEVNAME ".%d", 0);
+
+ clk = pll_clk_register(&pdev->dev, "pll_clk", "master_clk");
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "failed to register clock");
+ return PTR_ERR(clk);
+ }
+ clk_register_clkdev(clk, "pll_clk", DEVNAME ".%d", 0);
+
+ clk = clk_register_divider(&pdev->dev, "core_clk", "pll_clk",
+ CLK_SET_RATE_GATE, (unsigned char *)SCKCR,
+ 0, 3, CLK_DIVIDER_POWER_OF_TWO, &clklock);
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "failed to register clock");
+ return PTR_ERR(clk);
+ }
+ clk_register_clkdev(clk, "core_clk", DEVNAME ".%d", 0);
+
+ clk_add_alias("peripheral_clk", NULL, "core_clk", &pdev->dev);
+ return 0;
+}
+
+static struct platform_driver cpg_driver = {
+ .driver = {
+ .name = DEVNAME,
+ },
+ .probe = clk_probe,
+};
+
+early_platform_init(DEVNAME, &cpg_driver);
+
+static struct platform_device clk_device = {
+ .name = DEVNAME,
+ .id = 0,
+};
+
+static struct platform_device *devices[] __initdata = {
+ &clk_device,
+};
+
+int __init h8300_clk_init(int hz)
+{
+ static int master_hz;
+
+ master_hz = hz;
+ clk_device.dev.platform_data = &master_hz;
+ early_platform_add_devices(devices,
+ ARRAY_SIZE(devices));
+ early_platform_driver_register_all(DEVNAME);
+ early_platform_driver_probe(DEVNAME, 1, 0);
+ return 0;
+}
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index d936409..3f86c1a 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -635,6 +635,18 @@ static inline void clk_writel(u32 val, u32 __iomem *reg)
iowrite32be(val, reg);
}

+#elif IS_ENABLED(CONFIG_H8300)
+
+static inline u32 clk_readl(u32 __iomem *reg)
+{
+ return __raw_readb(reg);
+}
+
+static inline void clk_writel(u32 val, u32 __iomem *reg)
+{
+ __raw_writeb(val, reg);
+}
+
#else /* platform dependent I/O accessors */

static inline u32 clk_readl(u32 __iomem *reg)
--
2.1.4