| Message ID | 87k2pqlkx1.wl%kuninori.morimoto.gx@renesas.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
Hi ping ? > > From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> > > This patch adds CS2000 Fractional-N driver as clock provider. > > Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> > --- > v5 -> v6 > > - remove redundant variable from each functions > - multi line code become one line > - end of comment has dot > - cs2000_wait_pll_lock() returns -ETIMEDOUT instead of -EIO > - removed explicit casting from ratio function > - removed magic number > > .../devicetree/bindings/clock/cs2000-cp.txt | 22 + > drivers/clk/Kconfig | 6 + > drivers/clk/Makefile | 1 + > drivers/clk/clk-cs2000-cp.c | 509 +++++++++++++++++++++ > 4 files changed, 538 insertions(+) > create mode 100644 Documentation/devicetree/bindings/clock/cs2000-cp.txt > create mode 100644 drivers/clk/clk-cs2000-cp.c > > diff --git a/Documentation/devicetree/bindings/clock/cs2000-cp.txt b/Documentation/devicetree/bindings/clock/cs2000-cp.txt > new file mode 100644 > index 0000000..54e6df0 > --- /dev/null > +++ b/Documentation/devicetree/bindings/clock/cs2000-cp.txt > @@ -0,0 +1,22 @@ > +CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier > + > +Required properties: > + > +- compatible: "cirrus,cs2000-cp" > +- reg: The chip select number on the I2C bus > +- clocks: common clock binding for CLK_IN, XTI/REF_CLK > +- clock-names: CLK_IN : clk_in, XTI/REF_CLK : ref_clk > +- #clock-cells: must be <0> > + > +Example: > + > +&i2c2 { > + ... > + cs2000: clk_multiplier@4f { > + #clock-cells = <0>; > + compatible = "cirrus,cs2000-cp"; > + reg = <0x4f>; > + clocks = <&rcar_sound 0>, <&x12_clk>; > + clock-names = "clk_in", "ref_clk"; > + }; > +}; > diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig > index a1fa611..b8c347f 100644 > --- a/drivers/clk/Kconfig > +++ b/drivers/clk/Kconfig > @@ -116,6 +116,12 @@ config COMMON_CLK_CDCE925 > Given a target output frequency, the driver will set the PLL and > divider to best approximate the desired output. > > +config COMMON_CLK_CS2000_CP > + tristate "Clock driver for CS2000 Fractional-N Clock Synthesizer & Clock Multiplier" > + depends on I2C > + help > + If you say yes here you get support for the CS2000 clock multiplier. > + > config COMMON_CLK_S2MPS11 > tristate "Clock driver for S2MPS1X/S5M8767 MFD" > depends on MFD_SEC_CORE > diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile > index 366350a..86afe50 100644 > --- a/drivers/clk/Makefile > +++ b/drivers/clk/Makefile > @@ -21,6 +21,7 @@ obj-$(CONFIG_MACH_ASM9260) += clk-asm9260.o > obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o > obj-$(CONFIG_ARCH_AXXIA) += clk-axm5516.o > obj-$(CONFIG_COMMON_CLK_CDCE706) += clk-cdce706.o > +obj-$(CONFIG_COMMON_CLK_CS2000_CP) += clk-cs2000-cp.o > obj-$(CONFIG_ARCH_CLPS711X) += clk-clps711x.o > obj-$(CONFIG_ARCH_EFM32) += clk-efm32gg.o > obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o > diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c > new file mode 100644 > index 0000000..cc90d87 > --- /dev/null > +++ b/drivers/clk/clk-cs2000-cp.c > @@ -0,0 +1,509 @@ > +/* > + * CS2000 -- CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier > + * > + * Copyright (C) 2015 Renesas Electronics Corporation > + * Kuninori Morimoto <kuninori.morimoto.gx@renesas.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/clk-provider.h> > +#include <linux/delay.h> > +#include <linux/clk.h> > +#include <linux/i2c.h> > +#include <linux/of_device.h> > +#include <linux/module.h> > + > +#define CH_MAX 4 > +#define RATIO_REG_SIZE 4 > + > +#define DEVICE_ID 0x1 > +#define DEVICE_CTRL 0x2 > +#define DEVICE_CFG1 0x3 > +#define DEVICE_CFG2 0x4 > +#define GLOBAL_CFG 0x5 > +#define Ratio_Add(x, nth) (6 + (x * 4) + (nth)) > +#define Ratio_Val(x, nth) ((x >> (24 - (8 * nth))) & 0xFF) > +#define Val_Ratio(x, nth) ((x & 0xFF) << (24 - (8 * nth))) > +#define FUNC_CFG1 0x16 > +#define FUNC_CFG2 0x17 > + > +/* DEVICE_ID */ > +#define REVISION_MASK (0x7) > +#define REVISION_B2_B3 (0x4) > +#define REVISION_C1 (0x6) > + > +/* DEVICE_CTRL */ > +#define PLL_UNLOCK (1 << 7) > + > +/* DEVICE_CFG1 */ > +#define RSEL(x) (((x) & 0x3) << 3) > +#define RSEL_MASK RSEL(0x3) > +#define ENDEV1 (0x1) > + > +/* GLOBAL_CFG */ > +#define ENDEV2 (0x1) > + > +#define CH_SIZE_ERR(ch) ((ch < 0) || (ch >= CH_MAX)) > +#define hw_to_priv(_hw) container_of(_hw, struct cs2000_priv, hw) > +#define priv_to_client(priv) (priv->client) > +#define priv_to_dev(priv) (&(priv_to_client(priv)->dev)) > + > +#define CLK_IN 0 > +#define REF_CLK 1 > +#define CLK_MAX 2 > + > +struct cs2000_priv { > + struct clk_hw hw; > + struct i2c_client *client; > + struct clk *clk_in; > + struct clk *ref_clk; > + struct clk *clk_out; > +}; > + > +static const struct of_device_id cs2000_of_match[] = { > + { .compatible = "cirrus,cs2000-cp", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, cs2000_of_match); > + > +static const struct i2c_device_id cs2000_id[] = { > + { "cs2000-cp", }, > + {} > +}; > +MODULE_DEVICE_TABLE(i2c, cs2000_id); > + > +#define cs2000_read(priv, addr) \ > + i2c_smbus_read_byte_data(priv_to_client(priv), addr) > +#define cs2000_write(priv, addr, val) \ > + i2c_smbus_write_byte_data(priv_to_client(priv), addr, val) > + > +static int cs2000_bset(struct cs2000_priv *priv, u8 addr, u8 mask, u8 val) > +{ > + s32 data; > + > + data = cs2000_read(priv, addr); > + if (data < 0) > + return data; > + > + data &= ~mask; > + data |= (val & mask); > + > + return cs2000_write(priv, addr, data); > +} > + > +static int cs2000_enable_dev_config(struct cs2000_priv *priv, bool enable) > +{ > + int ret; > + > + ret = cs2000_bset(priv, DEVICE_CFG1, ENDEV1, > + enable ? ENDEV1 : 0); > + if (ret < 0) > + return ret; > + > + ret = cs2000_bset(priv, GLOBAL_CFG, ENDEV2, > + enable ? ENDEV2 : 0); > + if (ret < 0) > + return ret; > + > + return 0; > +} > + > +static int cs2000_clk_in_bound_rate(struct cs2000_priv *priv, > + u32 rate_in) > +{ > + u32 val; > + > + if (rate_in >= 32000000 && rate_in < 56000000) > + val = 0x0; > + else if (rate_in >= 16000000 && rate_in < 28000000) > + val = 0x1; > + else if (rate_in >= 8000000 && rate_in < 14000000) > + val = 0x2; > + else > + return -EINVAL; > + > + return cs2000_bset(priv, FUNC_CFG1, 0x3 << 3, val << 3); > +} > + > +static int cs2000_wait_pll_lock(struct cs2000_priv *priv) > +{ > + struct device *dev = priv_to_dev(priv); > + s32 val; > + unsigned int i; > + > + for (i = 0; i < 256; i++) { > + val = cs2000_read(priv, DEVICE_CTRL); > + if (val < 0) > + return val; > + if (!(val & PLL_UNLOCK)) > + return 0; > + udelay(1); > + } > + > + dev_err(dev, "pll lock failed\n"); > + > + return -ETIMEDOUT; > +} > + > +static int cs2000_clk_out_enable(struct cs2000_priv *priv, bool enable) > +{ > + /* enable both AUX_OUT, CLK_OUT */ > + return cs2000_write(priv, DEVICE_CTRL, enable ? 0 : 0x3); > +} > + > +static u32 cs2000_rate_to_ratio(u32 rate_in, u32 rate_out) > +{ > + u64 ratio; > + > + /* > + * ratio = rate_out / rate_in * 2^20 > + * > + * To avoid over flow, rate_out is u64. > + * The result should be u32. > + */ > + ratio = (u64)rate_out << 20; > + do_div(ratio, rate_in); > + > + return ratio; > +} > + > +static unsigned long cs2000_ratio_to_rate(u32 ratio, u32 rate_in) > +{ > + u64 rate_out; > + > + /* > + * ratio = rate_out / rate_in * 2^20 > + * > + * To avoid over flow, rate_out is u64. > + * The result should be u32 or unsigned long. > + */ > + > + rate_out = (u64)ratio * rate_in; > + return rate_out >> 20; > +} > + > +static int cs2000_ratio_set(struct cs2000_priv *priv, > + int ch, u32 rate_in, u32 rate_out) > +{ > + u32 val; > + unsigned int i; > + int ret; > + > + if (CH_SIZE_ERR(ch)) > + return -EINVAL; > + > + val = cs2000_rate_to_ratio(rate_in, rate_out); > + for (i = 0; i < RATIO_REG_SIZE; i++) { > + ret = cs2000_write(priv, > + Ratio_Add(ch, i), > + Ratio_Val(val, i)); > + if (ret < 0) > + return ret; > + } > + > + return 0; > +} > + > +static u32 cs2000_ratio_get(struct cs2000_priv *priv, int ch) > +{ > + u32 tmp, val; > + unsigned int i; > + > + val = 0; > + for (i = 0; i < RATIO_REG_SIZE; i++) { > + tmp = cs2000_read(priv, Ratio_Add(ch, i)); > + if (tmp < 0) > + return 0; > + > + val |= Val_Ratio(tmp, i); > + } > + > + return val; > +} > + > +static int cs2000_ratio_select(struct cs2000_priv *priv, int ch) > +{ > + int ret; > + > + if (CH_SIZE_ERR(ch)) > + return -EINVAL; > + > + /* > + * FIXME > + * > + * this driver supports static ratio mode only at this point. > + */ > + ret = cs2000_bset(priv, DEVICE_CFG1, RSEL_MASK, RSEL(ch)); > + if (ret < 0) > + return ret; > + > + ret = cs2000_write(priv, DEVICE_CFG2, 0x0); > + if (ret < 0) > + return ret; > + > + return 0; > +} > + > +static unsigned long cs2000_recalc_rate(struct clk_hw *hw, > + unsigned long parent_rate) > +{ > + struct cs2000_priv *priv = hw_to_priv(hw); > + int ch = 0; /* it uses ch0 only at this point */ > + u32 ratio; > + > + ratio = cs2000_ratio_get(priv, ch); > + > + return cs2000_ratio_to_rate(ratio, parent_rate); > +} > + > +static long cs2000_round_rate(struct clk_hw *hw, unsigned long rate, > + unsigned long *parent_rate) > +{ > + u32 ratio; > + > + ratio = cs2000_rate_to_ratio(*parent_rate, rate); > + > + return cs2000_ratio_to_rate(ratio, *parent_rate); > +} > + > +static int __cs2000_set_rate(struct cs2000_priv *priv, int ch, > + unsigned long rate, unsigned long parent_rate) > + > +{ > + int ret; > + > + ret = cs2000_clk_in_bound_rate(priv, parent_rate); > + if (ret < 0) > + return ret; > + > + ret = cs2000_ratio_set(priv, ch, parent_rate, rate); > + if (ret < 0) > + return ret; > + > + ret = cs2000_ratio_select(priv, ch); > + if (ret < 0) > + return ret; > + > + return 0; > +} > + > +static int cs2000_set_rate(struct clk_hw *hw, > + unsigned long rate, unsigned long parent_rate) > +{ > + struct cs2000_priv *priv = hw_to_priv(hw); > + int ch = 0; /* it uses ch0 only at this point */ > + > + return __cs2000_set_rate(priv, ch, rate, parent_rate); > +} > + > +static int cs2000_enable(struct clk_hw *hw) > +{ > + struct cs2000_priv *priv = hw_to_priv(hw); > + int ret; > + > + ret = cs2000_enable_dev_config(priv, true); > + if (ret < 0) > + return ret; > + > + ret = cs2000_clk_out_enable(priv, true); > + if (ret < 0) > + return ret; > + > + ret = cs2000_wait_pll_lock(priv); > + if (ret < 0) > + return ret; > + > + return ret; > +} > + > +static void cs2000_disable(struct clk_hw *hw) > +{ > + struct cs2000_priv *priv = hw_to_priv(hw); > + > + cs2000_enable_dev_config(priv, false); > + > + cs2000_clk_out_enable(priv, false); > +} > + > +static u8 cs2000_get_parent(struct clk_hw *hw) > +{ > + /* always return REF_CLK */ > + return REF_CLK; > +} > + > +static const struct clk_ops cs2000_ops = { > + .get_parent = cs2000_get_parent, > + .recalc_rate = cs2000_recalc_rate, > + .round_rate = cs2000_round_rate, > + .set_rate = cs2000_set_rate, > + .prepare = cs2000_enable, > + .unprepare = cs2000_disable, > +}; > + > +static int cs2000_clk_get(struct cs2000_priv *priv) > +{ > + struct i2c_client *client = priv_to_client(priv); > + struct device *dev = &client->dev; > + struct clk *clk_in, *ref_clk; > + > + clk_in = devm_clk_get(dev, "clk_in"); > + /* not yet provided */ > + if (IS_ERR(clk_in)) > + return -EPROBE_DEFER; > + > + ref_clk = devm_clk_get(dev, "ref_clk"); > + /* not yet provided */ > + if (IS_ERR(ref_clk)) > + return -EPROBE_DEFER; > + > + priv->clk_in = clk_in; > + priv->ref_clk = ref_clk; > + > + return 0; > +} > + > +static int cs2000_clk_register(struct cs2000_priv *priv) > +{ > + struct device *dev = priv_to_dev(priv); > + struct device_node *np = dev->of_node; > + struct clk_init_data init; > + const char *name = np->name; > + struct clk *clk; > + static const char *parent_names[CLK_MAX]; > + int ch = 0; /* it uses ch0 only at this point */ > + int rate; > + int ret; > + > + of_property_read_string(np, "clock-output-names", &name); > + > + /* > + * set default rate as 1/1. > + * otherwise .set_rate which setup ratio > + * is never called if user requests 1/1 rate > + */ > + rate = clk_get_rate(priv->ref_clk); > + ret = __cs2000_set_rate(priv, ch, rate, rate); > + if (ret < 0) > + return ret; > + > + parent_names[CLK_IN] = __clk_get_name(priv->clk_in); > + parent_names[REF_CLK] = __clk_get_name(priv->ref_clk); > + > + init.name = name; > + init.ops = &cs2000_ops; > + init.flags = CLK_SET_RATE_GATE; > + init.parent_names = parent_names; > + init.num_parents = ARRAY_SIZE(parent_names); > + > + priv->hw.init = &init; > + > + clk = clk_register(dev, &priv->hw); > + if (IS_ERR(clk)) > + return PTR_ERR(clk); > + > + ret = of_clk_add_provider(np, of_clk_src_simple_get, clk); > + if (ret < 0) { > + clk_unregister(clk); > + return ret; > + } > + > + priv->clk_out = clk; > + > + return 0; > +} > + > +static int cs2000_version_print(struct cs2000_priv *priv) > +{ > + struct i2c_client *client = priv_to_client(priv); > + struct device *dev = &client->dev; > + s32 val; > + const char *revision; > + > + val = cs2000_read(priv, DEVICE_ID); > + if (val < 0) > + return val; > + > + /* CS2000 should be 0x0 */ > + if (val >> 3) > + return -EIO; > + > + switch (val & REVISION_MASK) { > + case REVISION_B2_B3: > + revision = "B2 / B3"; > + break; > + case REVISION_C1: > + revision = "C1"; > + break; > + default: > + return -EIO; > + } > + > + dev_info(dev, "revision - %s\n", revision); > + > + return 0; > +} > + > +static int cs2000_remove(struct i2c_client *client) > +{ > + struct cs2000_priv *priv = i2c_get_clientdata(client); > + struct device *dev = &client->dev; > + struct device_node *np = dev->of_node; > + > + of_clk_del_provider(np); > + > + clk_unregister(priv->clk_out); > + > + return 0; > +} > + > +static int cs2000_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct cs2000_priv *priv; > + struct device *dev = &client->dev; > + int ret; > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + priv->client = client; > + i2c_set_clientdata(client, priv); > + > + ret = cs2000_clk_get(priv); > + if (ret < 0) > + return ret; > + > + ret = cs2000_clk_register(priv); > + if (ret < 0) > + return ret; > + > + ret = cs2000_version_print(priv); > + if (ret < 0) > + goto probe_err; > + > + return 0; > + > +probe_err: > + cs2000_remove(client); > + > + return ret; > +} > + > +static struct i2c_driver cs2000_driver = { > + .driver = { > + .name = "cs2000-cp", > + .of_match_table = cs2000_of_match, > + }, > + .probe = cs2000_probe, > + .remove = cs2000_remove, > + .id_table = cs2000_id, > +}; > + > +module_i2c_driver(cs2000_driver); > + > +MODULE_DESCRIPTION("CS2000-CP driver"); > +MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); > +MODULE_LICENSE("GPL v2"); > -- > 1.9.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-sh" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi again ping again ? > ping ? > > > > > From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> > > > > This patch adds CS2000 Fractional-N driver as clock provider. > > > > Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> > > --- > > v5 -> v6 > > > > - remove redundant variable from each functions > > - multi line code become one line > > - end of comment has dot > > - cs2000_wait_pll_lock() returns -ETIMEDOUT instead of -EIO > > - removed explicit casting from ratio function > > - removed magic number > > > > .../devicetree/bindings/clock/cs2000-cp.txt | 22 + > > drivers/clk/Kconfig | 6 + > > drivers/clk/Makefile | 1 + > > drivers/clk/clk-cs2000-cp.c | 509 +++++++++++++++++++++ > > 4 files changed, 538 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/clock/cs2000-cp.txt > > create mode 100644 drivers/clk/clk-cs2000-cp.c > > > > diff --git a/Documentation/devicetree/bindings/clock/cs2000-cp.txt b/Documentation/devicetree/bindings/clock/cs2000-cp.txt > > new file mode 100644 > > index 0000000..54e6df0 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/clock/cs2000-cp.txt > > @@ -0,0 +1,22 @@ > > +CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier > > + > > +Required properties: > > + > > +- compatible: "cirrus,cs2000-cp" > > +- reg: The chip select number on the I2C bus > > +- clocks: common clock binding for CLK_IN, XTI/REF_CLK > > +- clock-names: CLK_IN : clk_in, XTI/REF_CLK : ref_clk > > +- #clock-cells: must be <0> > > + > > +Example: > > + > > +&i2c2 { > > + ... > > + cs2000: clk_multiplier@4f { > > + #clock-cells = <0>; > > + compatible = "cirrus,cs2000-cp"; > > + reg = <0x4f>; > > + clocks = <&rcar_sound 0>, <&x12_clk>; > > + clock-names = "clk_in", "ref_clk"; > > + }; > > +}; > > diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig > > index a1fa611..b8c347f 100644 > > --- a/drivers/clk/Kconfig > > +++ b/drivers/clk/Kconfig > > @@ -116,6 +116,12 @@ config COMMON_CLK_CDCE925 > > Given a target output frequency, the driver will set the PLL and > > divider to best approximate the desired output. > > > > +config COMMON_CLK_CS2000_CP > > + tristate "Clock driver for CS2000 Fractional-N Clock Synthesizer & Clock Multiplier" > > + depends on I2C > > + help > > + If you say yes here you get support for the CS2000 clock multiplier. > > + > > config COMMON_CLK_S2MPS11 > > tristate "Clock driver for S2MPS1X/S5M8767 MFD" > > depends on MFD_SEC_CORE > > diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile > > index 366350a..86afe50 100644 > > --- a/drivers/clk/Makefile > > +++ b/drivers/clk/Makefile > > @@ -21,6 +21,7 @@ obj-$(CONFIG_MACH_ASM9260) += clk-asm9260.o > > obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o > > obj-$(CONFIG_ARCH_AXXIA) += clk-axm5516.o > > obj-$(CONFIG_COMMON_CLK_CDCE706) += clk-cdce706.o > > +obj-$(CONFIG_COMMON_CLK_CS2000_CP) += clk-cs2000-cp.o > > obj-$(CONFIG_ARCH_CLPS711X) += clk-clps711x.o > > obj-$(CONFIG_ARCH_EFM32) += clk-efm32gg.o > > obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o > > diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c > > new file mode 100644 > > index 0000000..cc90d87 > > --- /dev/null > > +++ b/drivers/clk/clk-cs2000-cp.c > > @@ -0,0 +1,509 @@ > > +/* > > + * CS2000 -- CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier > > + * > > + * Copyright (C) 2015 Renesas Electronics Corporation > > + * Kuninori Morimoto <kuninori.morimoto.gx@renesas.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/clk-provider.h> > > +#include <linux/delay.h> > > +#include <linux/clk.h> > > +#include <linux/i2c.h> > > +#include <linux/of_device.h> > > +#include <linux/module.h> > > + > > +#define CH_MAX 4 > > +#define RATIO_REG_SIZE 4 > > + > > +#define DEVICE_ID 0x1 > > +#define DEVICE_CTRL 0x2 > > +#define DEVICE_CFG1 0x3 > > +#define DEVICE_CFG2 0x4 > > +#define GLOBAL_CFG 0x5 > > +#define Ratio_Add(x, nth) (6 + (x * 4) + (nth)) > > +#define Ratio_Val(x, nth) ((x >> (24 - (8 * nth))) & 0xFF) > > +#define Val_Ratio(x, nth) ((x & 0xFF) << (24 - (8 * nth))) > > +#define FUNC_CFG1 0x16 > > +#define FUNC_CFG2 0x17 > > + > > +/* DEVICE_ID */ > > +#define REVISION_MASK (0x7) > > +#define REVISION_B2_B3 (0x4) > > +#define REVISION_C1 (0x6) > > + > > +/* DEVICE_CTRL */ > > +#define PLL_UNLOCK (1 << 7) > > + > > +/* DEVICE_CFG1 */ > > +#define RSEL(x) (((x) & 0x3) << 3) > > +#define RSEL_MASK RSEL(0x3) > > +#define ENDEV1 (0x1) > > + > > +/* GLOBAL_CFG */ > > +#define ENDEV2 (0x1) > > + > > +#define CH_SIZE_ERR(ch) ((ch < 0) || (ch >= CH_MAX)) > > +#define hw_to_priv(_hw) container_of(_hw, struct cs2000_priv, hw) > > +#define priv_to_client(priv) (priv->client) > > +#define priv_to_dev(priv) (&(priv_to_client(priv)->dev)) > > + > > +#define CLK_IN 0 > > +#define REF_CLK 1 > > +#define CLK_MAX 2 > > + > > +struct cs2000_priv { > > + struct clk_hw hw; > > + struct i2c_client *client; > > + struct clk *clk_in; > > + struct clk *ref_clk; > > + struct clk *clk_out; > > +}; > > + > > +static const struct of_device_id cs2000_of_match[] = { > > + { .compatible = "cirrus,cs2000-cp", }, > > + {}, > > +}; > > +MODULE_DEVICE_TABLE(of, cs2000_of_match); > > + > > +static const struct i2c_device_id cs2000_id[] = { > > + { "cs2000-cp", }, > > + {} > > +}; > > +MODULE_DEVICE_TABLE(i2c, cs2000_id); > > + > > +#define cs2000_read(priv, addr) \ > > + i2c_smbus_read_byte_data(priv_to_client(priv), addr) > > +#define cs2000_write(priv, addr, val) \ > > + i2c_smbus_write_byte_data(priv_to_client(priv), addr, val) > > + > > +static int cs2000_bset(struct cs2000_priv *priv, u8 addr, u8 mask, u8 val) > > +{ > > + s32 data; > > + > > + data = cs2000_read(priv, addr); > > + if (data < 0) > > + return data; > > + > > + data &= ~mask; > > + data |= (val & mask); > > + > > + return cs2000_write(priv, addr, data); > > +} > > + > > +static int cs2000_enable_dev_config(struct cs2000_priv *priv, bool enable) > > +{ > > + int ret; > > + > > + ret = cs2000_bset(priv, DEVICE_CFG1, ENDEV1, > > + enable ? ENDEV1 : 0); > > + if (ret < 0) > > + return ret; > > + > > + ret = cs2000_bset(priv, GLOBAL_CFG, ENDEV2, > > + enable ? ENDEV2 : 0); > > + if (ret < 0) > > + return ret; > > + > > + return 0; > > +} > > + > > +static int cs2000_clk_in_bound_rate(struct cs2000_priv *priv, > > + u32 rate_in) > > +{ > > + u32 val; > > + > > + if (rate_in >= 32000000 && rate_in < 56000000) > > + val = 0x0; > > + else if (rate_in >= 16000000 && rate_in < 28000000) > > + val = 0x1; > > + else if (rate_in >= 8000000 && rate_in < 14000000) > > + val = 0x2; > > + else > > + return -EINVAL; > > + > > + return cs2000_bset(priv, FUNC_CFG1, 0x3 << 3, val << 3); > > +} > > + > > +static int cs2000_wait_pll_lock(struct cs2000_priv *priv) > > +{ > > + struct device *dev = priv_to_dev(priv); > > + s32 val; > > + unsigned int i; > > + > > + for (i = 0; i < 256; i++) { > > + val = cs2000_read(priv, DEVICE_CTRL); > > + if (val < 0) > > + return val; > > + if (!(val & PLL_UNLOCK)) > > + return 0; > > + udelay(1); > > + } > > + > > + dev_err(dev, "pll lock failed\n"); > > + > > + return -ETIMEDOUT; > > +} > > + > > +static int cs2000_clk_out_enable(struct cs2000_priv *priv, bool enable) > > +{ > > + /* enable both AUX_OUT, CLK_OUT */ > > + return cs2000_write(priv, DEVICE_CTRL, enable ? 0 : 0x3); > > +} > > + > > +static u32 cs2000_rate_to_ratio(u32 rate_in, u32 rate_out) > > +{ > > + u64 ratio; > > + > > + /* > > + * ratio = rate_out / rate_in * 2^20 > > + * > > + * To avoid over flow, rate_out is u64. > > + * The result should be u32. > > + */ > > + ratio = (u64)rate_out << 20; > > + do_div(ratio, rate_in); > > + > > + return ratio; > > +} > > + > > +static unsigned long cs2000_ratio_to_rate(u32 ratio, u32 rate_in) > > +{ > > + u64 rate_out; > > + > > + /* > > + * ratio = rate_out / rate_in * 2^20 > > + * > > + * To avoid over flow, rate_out is u64. > > + * The result should be u32 or unsigned long. > > + */ > > + > > + rate_out = (u64)ratio * rate_in; > > + return rate_out >> 20; > > +} > > + > > +static int cs2000_ratio_set(struct cs2000_priv *priv, > > + int ch, u32 rate_in, u32 rate_out) > > +{ > > + u32 val; > > + unsigned int i; > > + int ret; > > + > > + if (CH_SIZE_ERR(ch)) > > + return -EINVAL; > > + > > + val = cs2000_rate_to_ratio(rate_in, rate_out); > > + for (i = 0; i < RATIO_REG_SIZE; i++) { > > + ret = cs2000_write(priv, > > + Ratio_Add(ch, i), > > + Ratio_Val(val, i)); > > + if (ret < 0) > > + return ret; > > + } > > + > > + return 0; > > +} > > + > > +static u32 cs2000_ratio_get(struct cs2000_priv *priv, int ch) > > +{ > > + u32 tmp, val; > > + unsigned int i; > > + > > + val = 0; > > + for (i = 0; i < RATIO_REG_SIZE; i++) { > > + tmp = cs2000_read(priv, Ratio_Add(ch, i)); > > + if (tmp < 0) > > + return 0; > > + > > + val |= Val_Ratio(tmp, i); > > + } > > + > > + return val; > > +} > > + > > +static int cs2000_ratio_select(struct cs2000_priv *priv, int ch) > > +{ > > + int ret; > > + > > + if (CH_SIZE_ERR(ch)) > > + return -EINVAL; > > + > > + /* > > + * FIXME > > + * > > + * this driver supports static ratio mode only at this point. > > + */ > > + ret = cs2000_bset(priv, DEVICE_CFG1, RSEL_MASK, RSEL(ch)); > > + if (ret < 0) > > + return ret; > > + > > + ret = cs2000_write(priv, DEVICE_CFG2, 0x0); > > + if (ret < 0) > > + return ret; > > + > > + return 0; > > +} > > + > > +static unsigned long cs2000_recalc_rate(struct clk_hw *hw, > > + unsigned long parent_rate) > > +{ > > + struct cs2000_priv *priv = hw_to_priv(hw); > > + int ch = 0; /* it uses ch0 only at this point */ > > + u32 ratio; > > + > > + ratio = cs2000_ratio_get(priv, ch); > > + > > + return cs2000_ratio_to_rate(ratio, parent_rate); > > +} > > + > > +static long cs2000_round_rate(struct clk_hw *hw, unsigned long rate, > > + unsigned long *parent_rate) > > +{ > > + u32 ratio; > > + > > + ratio = cs2000_rate_to_ratio(*parent_rate, rate); > > + > > + return cs2000_ratio_to_rate(ratio, *parent_rate); > > +} > > + > > +static int __cs2000_set_rate(struct cs2000_priv *priv, int ch, > > + unsigned long rate, unsigned long parent_rate) > > + > > +{ > > + int ret; > > + > > + ret = cs2000_clk_in_bound_rate(priv, parent_rate); > > + if (ret < 0) > > + return ret; > > + > > + ret = cs2000_ratio_set(priv, ch, parent_rate, rate); > > + if (ret < 0) > > + return ret; > > + > > + ret = cs2000_ratio_select(priv, ch); > > + if (ret < 0) > > + return ret; > > + > > + return 0; > > +} > > + > > +static int cs2000_set_rate(struct clk_hw *hw, > > + unsigned long rate, unsigned long parent_rate) > > +{ > > + struct cs2000_priv *priv = hw_to_priv(hw); > > + int ch = 0; /* it uses ch0 only at this point */ > > + > > + return __cs2000_set_rate(priv, ch, rate, parent_rate); > > +} > > + > > +static int cs2000_enable(struct clk_hw *hw) > > +{ > > + struct cs2000_priv *priv = hw_to_priv(hw); > > + int ret; > > + > > + ret = cs2000_enable_dev_config(priv, true); > > + if (ret < 0) > > + return ret; > > + > > + ret = cs2000_clk_out_enable(priv, true); > > + if (ret < 0) > > + return ret; > > + > > + ret = cs2000_wait_pll_lock(priv); > > + if (ret < 0) > > + return ret; > > + > > + return ret; > > +} > > + > > +static void cs2000_disable(struct clk_hw *hw) > > +{ > > + struct cs2000_priv *priv = hw_to_priv(hw); > > + > > + cs2000_enable_dev_config(priv, false); > > + > > + cs2000_clk_out_enable(priv, false); > > +} > > + > > +static u8 cs2000_get_parent(struct clk_hw *hw) > > +{ > > + /* always return REF_CLK */ > > + return REF_CLK; > > +} > > + > > +static const struct clk_ops cs2000_ops = { > > + .get_parent = cs2000_get_parent, > > + .recalc_rate = cs2000_recalc_rate, > > + .round_rate = cs2000_round_rate, > > + .set_rate = cs2000_set_rate, > > + .prepare = cs2000_enable, > > + .unprepare = cs2000_disable, > > +}; > > + > > +static int cs2000_clk_get(struct cs2000_priv *priv) > > +{ > > + struct i2c_client *client = priv_to_client(priv); > > + struct device *dev = &client->dev; > > + struct clk *clk_in, *ref_clk; > > + > > + clk_in = devm_clk_get(dev, "clk_in"); > > + /* not yet provided */ > > + if (IS_ERR(clk_in)) > > + return -EPROBE_DEFER; > > + > > + ref_clk = devm_clk_get(dev, "ref_clk"); > > + /* not yet provided */ > > + if (IS_ERR(ref_clk)) > > + return -EPROBE_DEFER; > > + > > + priv->clk_in = clk_in; > > + priv->ref_clk = ref_clk; > > + > > + return 0; > > +} > > + > > +static int cs2000_clk_register(struct cs2000_priv *priv) > > +{ > > + struct device *dev = priv_to_dev(priv); > > + struct device_node *np = dev->of_node; > > + struct clk_init_data init; > > + const char *name = np->name; > > + struct clk *clk; > > + static const char *parent_names[CLK_MAX]; > > + int ch = 0; /* it uses ch0 only at this point */ > > + int rate; > > + int ret; > > + > > + of_property_read_string(np, "clock-output-names", &name); > > + > > + /* > > + * set default rate as 1/1. > > + * otherwise .set_rate which setup ratio > > + * is never called if user requests 1/1 rate > > + */ > > + rate = clk_get_rate(priv->ref_clk); > > + ret = __cs2000_set_rate(priv, ch, rate, rate); > > + if (ret < 0) > > + return ret; > > + > > + parent_names[CLK_IN] = __clk_get_name(priv->clk_in); > > + parent_names[REF_CLK] = __clk_get_name(priv->ref_clk); > > + > > + init.name = name; > > + init.ops = &cs2000_ops; > > + init.flags = CLK_SET_RATE_GATE; > > + init.parent_names = parent_names; > > + init.num_parents = ARRAY_SIZE(parent_names); > > + > > + priv->hw.init = &init; > > + > > + clk = clk_register(dev, &priv->hw); > > + if (IS_ERR(clk)) > > + return PTR_ERR(clk); > > + > > + ret = of_clk_add_provider(np, of_clk_src_simple_get, clk); > > + if (ret < 0) { > > + clk_unregister(clk); > > + return ret; > > + } > > + > > + priv->clk_out = clk; > > + > > + return 0; > > +} > > + > > +static int cs2000_version_print(struct cs2000_priv *priv) > > +{ > > + struct i2c_client *client = priv_to_client(priv); > > + struct device *dev = &client->dev; > > + s32 val; > > + const char *revision; > > + > > + val = cs2000_read(priv, DEVICE_ID); > > + if (val < 0) > > + return val; > > + > > + /* CS2000 should be 0x0 */ > > + if (val >> 3) > > + return -EIO; > > + > > + switch (val & REVISION_MASK) { > > + case REVISION_B2_B3: > > + revision = "B2 / B3"; > > + break; > > + case REVISION_C1: > > + revision = "C1"; > > + break; > > + default: > > + return -EIO; > > + } > > + > > + dev_info(dev, "revision - %s\n", revision); > > + > > + return 0; > > +} > > + > > +static int cs2000_remove(struct i2c_client *client) > > +{ > > + struct cs2000_priv *priv = i2c_get_clientdata(client); > > + struct device *dev = &client->dev; > > + struct device_node *np = dev->of_node; > > + > > + of_clk_del_provider(np); > > + > > + clk_unregister(priv->clk_out); > > + > > + return 0; > > +} > > + > > +static int cs2000_probe(struct i2c_client *client, > > + const struct i2c_device_id *id) > > +{ > > + struct cs2000_priv *priv; > > + struct device *dev = &client->dev; > > + int ret; > > + > > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > > + if (!priv) > > + return -ENOMEM; > > + > > + priv->client = client; > > + i2c_set_clientdata(client, priv); > > + > > + ret = cs2000_clk_get(priv); > > + if (ret < 0) > > + return ret; > > + > > + ret = cs2000_clk_register(priv); > > + if (ret < 0) > > + return ret; > > + > > + ret = cs2000_version_print(priv); > > + if (ret < 0) > > + goto probe_err; > > + > > + return 0; > > + > > +probe_err: > > + cs2000_remove(client); > > + > > + return ret; > > +} > > + > > +static struct i2c_driver cs2000_driver = { > > + .driver = { > > + .name = "cs2000-cp", > > + .of_match_table = cs2000_of_match, > > + }, > > + .probe = cs2000_probe, > > + .remove = cs2000_remove, > > + .id_table = cs2000_id, > > +}; > > + > > +module_i2c_driver(cs2000_driver); > > + > > +MODULE_DESCRIPTION("CS2000-CP driver"); > > +MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); > > +MODULE_LICENSE("GPL v2"); > > -- > > 1.9.1 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-sh" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 11/10, Kuninori Morimoto wrote: > From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> > > This patch adds CS2000 Fractional-N driver as clock provider. > > Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> > --- Applied to clk-next
diff --git a/Documentation/devicetree/bindings/clock/cs2000-cp.txt b/Documentation/devicetree/bindings/clock/cs2000-cp.txt new file mode 100644 index 0000000..54e6df0 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/cs2000-cp.txt @@ -0,0 +1,22 @@ +CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier + +Required properties: + +- compatible: "cirrus,cs2000-cp" +- reg: The chip select number on the I2C bus +- clocks: common clock binding for CLK_IN, XTI/REF_CLK +- clock-names: CLK_IN : clk_in, XTI/REF_CLK : ref_clk +- #clock-cells: must be <0> + +Example: + +&i2c2 { + ... + cs2000: clk_multiplier@4f { + #clock-cells = <0>; + compatible = "cirrus,cs2000-cp"; + reg = <0x4f>; + clocks = <&rcar_sound 0>, <&x12_clk>; + clock-names = "clk_in", "ref_clk"; + }; +}; diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index a1fa611..b8c347f 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -116,6 +116,12 @@ config COMMON_CLK_CDCE925 Given a target output frequency, the driver will set the PLL and divider to best approximate the desired output. +config COMMON_CLK_CS2000_CP + tristate "Clock driver for CS2000 Fractional-N Clock Synthesizer & Clock Multiplier" + depends on I2C + help + If you say yes here you get support for the CS2000 clock multiplier. + config COMMON_CLK_S2MPS11 tristate "Clock driver for S2MPS1X/S5M8767 MFD" depends on MFD_SEC_CORE diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 366350a..86afe50 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_MACH_ASM9260) += clk-asm9260.o obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o obj-$(CONFIG_ARCH_AXXIA) += clk-axm5516.o obj-$(CONFIG_COMMON_CLK_CDCE706) += clk-cdce706.o +obj-$(CONFIG_COMMON_CLK_CS2000_CP) += clk-cs2000-cp.o obj-$(CONFIG_ARCH_CLPS711X) += clk-clps711x.o obj-$(CONFIG_ARCH_EFM32) += clk-efm32gg.o obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c new file mode 100644 index 0000000..cc90d87 --- /dev/null +++ b/drivers/clk/clk-cs2000-cp.c @@ -0,0 +1,509 @@ +/* + * CS2000 -- CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier + * + * Copyright (C) 2015 Renesas Electronics Corporation + * Kuninori Morimoto <kuninori.morimoto.gx@renesas.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/clk-provider.h> +#include <linux/delay.h> +#include <linux/clk.h> +#include <linux/i2c.h> +#include <linux/of_device.h> +#include <linux/module.h> + +#define CH_MAX 4 +#define RATIO_REG_SIZE 4 + +#define DEVICE_ID 0x1 +#define DEVICE_CTRL 0x2 +#define DEVICE_CFG1 0x3 +#define DEVICE_CFG2 0x4 +#define GLOBAL_CFG 0x5 +#define Ratio_Add(x, nth) (6 + (x * 4) + (nth)) +#define Ratio_Val(x, nth) ((x >> (24 - (8 * nth))) & 0xFF) +#define Val_Ratio(x, nth) ((x & 0xFF) << (24 - (8 * nth))) +#define FUNC_CFG1 0x16 +#define FUNC_CFG2 0x17 + +/* DEVICE_ID */ +#define REVISION_MASK (0x7) +#define REVISION_B2_B3 (0x4) +#define REVISION_C1 (0x6) + +/* DEVICE_CTRL */ +#define PLL_UNLOCK (1 << 7) + +/* DEVICE_CFG1 */ +#define RSEL(x) (((x) & 0x3) << 3) +#define RSEL_MASK RSEL(0x3) +#define ENDEV1 (0x1) + +/* GLOBAL_CFG */ +#define ENDEV2 (0x1) + +#define CH_SIZE_ERR(ch) ((ch < 0) || (ch >= CH_MAX)) +#define hw_to_priv(_hw) container_of(_hw, struct cs2000_priv, hw) +#define priv_to_client(priv) (priv->client) +#define priv_to_dev(priv) (&(priv_to_client(priv)->dev)) + +#define CLK_IN 0 +#define REF_CLK 1 +#define CLK_MAX 2 + +struct cs2000_priv { + struct clk_hw hw; + struct i2c_client *client; + struct clk *clk_in; + struct clk *ref_clk; + struct clk *clk_out; +}; + +static const struct of_device_id cs2000_of_match[] = { + { .compatible = "cirrus,cs2000-cp", }, + {}, +}; +MODULE_DEVICE_TABLE(of, cs2000_of_match); + +static const struct i2c_device_id cs2000_id[] = { + { "cs2000-cp", }, + {} +}; +MODULE_DEVICE_TABLE(i2c, cs2000_id); + +#define cs2000_read(priv, addr) \ + i2c_smbus_read_byte_data(priv_to_client(priv), addr) +#define cs2000_write(priv, addr, val) \ + i2c_smbus_write_byte_data(priv_to_client(priv), addr, val) + +static int cs2000_bset(struct cs2000_priv *priv, u8 addr, u8 mask, u8 val) +{ + s32 data; + + data = cs2000_read(priv, addr); + if (data < 0) + return data; + + data &= ~mask; + data |= (val & mask); + + return cs2000_write(priv, addr, data); +} + +static int cs2000_enable_dev_config(struct cs2000_priv *priv, bool enable) +{ + int ret; + + ret = cs2000_bset(priv, DEVICE_CFG1, ENDEV1, + enable ? ENDEV1 : 0); + if (ret < 0) + return ret; + + ret = cs2000_bset(priv, GLOBAL_CFG, ENDEV2, + enable ? ENDEV2 : 0); + if (ret < 0) + return ret; + + return 0; +} + +static int cs2000_clk_in_bound_rate(struct cs2000_priv *priv, + u32 rate_in) +{ + u32 val; + + if (rate_in >= 32000000 && rate_in < 56000000) + val = 0x0; + else if (rate_in >= 16000000 && rate_in < 28000000) + val = 0x1; + else if (rate_in >= 8000000 && rate_in < 14000000) + val = 0x2; + else + return -EINVAL; + + return cs2000_bset(priv, FUNC_CFG1, 0x3 << 3, val << 3); +} + +static int cs2000_wait_pll_lock(struct cs2000_priv *priv) +{ + struct device *dev = priv_to_dev(priv); + s32 val; + unsigned int i; + + for (i = 0; i < 256; i++) { + val = cs2000_read(priv, DEVICE_CTRL); + if (val < 0) + return val; + if (!(val & PLL_UNLOCK)) + return 0; + udelay(1); + } + + dev_err(dev, "pll lock failed\n"); + + return -ETIMEDOUT; +} + +static int cs2000_clk_out_enable(struct cs2000_priv *priv, bool enable) +{ + /* enable both AUX_OUT, CLK_OUT */ + return cs2000_write(priv, DEVICE_CTRL, enable ? 0 : 0x3); +} + +static u32 cs2000_rate_to_ratio(u32 rate_in, u32 rate_out) +{ + u64 ratio; + + /* + * ratio = rate_out / rate_in * 2^20 + * + * To avoid over flow, rate_out is u64. + * The result should be u32. + */ + ratio = (u64)rate_out << 20; + do_div(ratio, rate_in); + + return ratio; +} + +static unsigned long cs2000_ratio_to_rate(u32 ratio, u32 rate_in) +{ + u64 rate_out; + + /* + * ratio = rate_out / rate_in * 2^20 + * + * To avoid over flow, rate_out is u64. + * The result should be u32 or unsigned long. + */ + + rate_out = (u64)ratio * rate_in; + return rate_out >> 20; +} + +static int cs2000_ratio_set(struct cs2000_priv *priv, + int ch, u32 rate_in, u32 rate_out) +{ + u32 val; + unsigned int i; + int ret; + + if (CH_SIZE_ERR(ch)) + return -EINVAL; + + val = cs2000_rate_to_ratio(rate_in, rate_out); + for (i = 0; i < RATIO_REG_SIZE; i++) { + ret = cs2000_write(priv, + Ratio_Add(ch, i), + Ratio_Val(val, i)); + if (ret < 0) + return ret; + } + + return 0; +} + +static u32 cs2000_ratio_get(struct cs2000_priv *priv, int ch) +{ + u32 tmp, val; + unsigned int i; + + val = 0; + for (i = 0; i < RATIO_REG_SIZE; i++) { + tmp = cs2000_read(priv, Ratio_Add(ch, i)); + if (tmp < 0) + return 0; + + val |= Val_Ratio(tmp, i); + } + + return val; +} + +static int cs2000_ratio_select(struct cs2000_priv *priv, int ch) +{ + int ret; + + if (CH_SIZE_ERR(ch)) + return -EINVAL; + + /* + * FIXME + * + * this driver supports static ratio mode only at this point. + */ + ret = cs2000_bset(priv, DEVICE_CFG1, RSEL_MASK, RSEL(ch)); + if (ret < 0) + return ret; + + ret = cs2000_write(priv, DEVICE_CFG2, 0x0); + if (ret < 0) + return ret; + + return 0; +} + +static unsigned long cs2000_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct cs2000_priv *priv = hw_to_priv(hw); + int ch = 0; /* it uses ch0 only at this point */ + u32 ratio; + + ratio = cs2000_ratio_get(priv, ch); + + return cs2000_ratio_to_rate(ratio, parent_rate); +} + +static long cs2000_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + u32 ratio; + + ratio = cs2000_rate_to_ratio(*parent_rate, rate); + + return cs2000_ratio_to_rate(ratio, *parent_rate); +} + +static int __cs2000_set_rate(struct cs2000_priv *priv, int ch, + unsigned long rate, unsigned long parent_rate) + +{ + int ret; + + ret = cs2000_clk_in_bound_rate(priv, parent_rate); + if (ret < 0) + return ret; + + ret = cs2000_ratio_set(priv, ch, parent_rate, rate); + if (ret < 0) + return ret; + + ret = cs2000_ratio_select(priv, ch); + if (ret < 0) + return ret; + + return 0; +} + +static int cs2000_set_rate(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate) +{ + struct cs2000_priv *priv = hw_to_priv(hw); + int ch = 0; /* it uses ch0 only at this point */ + + return __cs2000_set_rate(priv, ch, rate, parent_rate); +} + +static int cs2000_enable(struct clk_hw *hw) +{ + struct cs2000_priv *priv = hw_to_priv(hw); + int ret; + + ret = cs2000_enable_dev_config(priv, true); + if (ret < 0) + return ret; + + ret = cs2000_clk_out_enable(priv, true); + if (ret < 0) + return ret; + + ret = cs2000_wait_pll_lock(priv); + if (ret < 0) + return ret; + + return ret; +} + +static void cs2000_disable(struct clk_hw *hw) +{ + struct cs2000_priv *priv = hw_to_priv(hw); + + cs2000_enable_dev_config(priv, false); + + cs2000_clk_out_enable(priv, false); +} + +static u8 cs2000_get_parent(struct clk_hw *hw) +{ + /* always return REF_CLK */ + return REF_CLK; +} + +static const struct clk_ops cs2000_ops = { + .get_parent = cs2000_get_parent, + .recalc_rate = cs2000_recalc_rate, + .round_rate = cs2000_round_rate, + .set_rate = cs2000_set_rate, + .prepare = cs2000_enable, + .unprepare = cs2000_disable, +}; + +static int cs2000_clk_get(struct cs2000_priv *priv) +{ + struct i2c_client *client = priv_to_client(priv); + struct device *dev = &client->dev; + struct clk *clk_in, *ref_clk; + + clk_in = devm_clk_get(dev, "clk_in"); + /* not yet provided */ + if (IS_ERR(clk_in)) + return -EPROBE_DEFER; + + ref_clk = devm_clk_get(dev, "ref_clk"); + /* not yet provided */ + if (IS_ERR(ref_clk)) + return -EPROBE_DEFER; + + priv->clk_in = clk_in; + priv->ref_clk = ref_clk; + + return 0; +} + +static int cs2000_clk_register(struct cs2000_priv *priv) +{ + struct device *dev = priv_to_dev(priv); + struct device_node *np = dev->of_node; + struct clk_init_data init; + const char *name = np->name; + struct clk *clk; + static const char *parent_names[CLK_MAX]; + int ch = 0; /* it uses ch0 only at this point */ + int rate; + int ret; + + of_property_read_string(np, "clock-output-names", &name); + + /* + * set default rate as 1/1. + * otherwise .set_rate which setup ratio + * is never called if user requests 1/1 rate + */ + rate = clk_get_rate(priv->ref_clk); + ret = __cs2000_set_rate(priv, ch, rate, rate); + if (ret < 0) + return ret; + + parent_names[CLK_IN] = __clk_get_name(priv->clk_in); + parent_names[REF_CLK] = __clk_get_name(priv->ref_clk); + + init.name = name; + init.ops = &cs2000_ops; + init.flags = CLK_SET_RATE_GATE; + init.parent_names = parent_names; + init.num_parents = ARRAY_SIZE(parent_names); + + priv->hw.init = &init; + + clk = clk_register(dev, &priv->hw); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + ret = of_clk_add_provider(np, of_clk_src_simple_get, clk); + if (ret < 0) { + clk_unregister(clk); + return ret; + } + + priv->clk_out = clk; + + return 0; +} + +static int cs2000_version_print(struct cs2000_priv *priv) +{ + struct i2c_client *client = priv_to_client(priv); + struct device *dev = &client->dev; + s32 val; + const char *revision; + + val = cs2000_read(priv, DEVICE_ID); + if (val < 0) + return val; + + /* CS2000 should be 0x0 */ + if (val >> 3) + return -EIO; + + switch (val & REVISION_MASK) { + case REVISION_B2_B3: + revision = "B2 / B3"; + break; + case REVISION_C1: + revision = "C1"; + break; + default: + return -EIO; + } + + dev_info(dev, "revision - %s\n", revision); + + return 0; +} + +static int cs2000_remove(struct i2c_client *client) +{ + struct cs2000_priv *priv = i2c_get_clientdata(client); + struct device *dev = &client->dev; + struct device_node *np = dev->of_node; + + of_clk_del_provider(np); + + clk_unregister(priv->clk_out); + + return 0; +} + +static int cs2000_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct cs2000_priv *priv; + struct device *dev = &client->dev; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->client = client; + i2c_set_clientdata(client, priv); + + ret = cs2000_clk_get(priv); + if (ret < 0) + return ret; + + ret = cs2000_clk_register(priv); + if (ret < 0) + return ret; + + ret = cs2000_version_print(priv); + if (ret < 0) + goto probe_err; + + return 0; + +probe_err: + cs2000_remove(client); + + return ret; +} + +static struct i2c_driver cs2000_driver = { + .driver = { + .name = "cs2000-cp", + .of_match_table = cs2000_of_match, + }, + .probe = cs2000_probe, + .remove = cs2000_remove, + .id_table = cs2000_id, +}; + +module_i2c_driver(cs2000_driver); + +MODULE_DESCRIPTION("CS2000-CP driver"); +MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); +MODULE_LICENSE("GPL v2");