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[RESEND,v3] clk: shmobile: sh73a0 common clock framework implementation

Message ID 1410196339-17478-1-git-send-email-ulrich.hecht+renesas@gmail.com (mailing list archive)
State Changes Requested
Headers show

Commit Message

Ulrich Hecht Sept. 8, 2014, 5:12 p.m. UTC
Driver for the SH73A0's clocks that are too specific to be supported by a
generic driver.

Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
---

Hi!

This fell by the wayside, perhaps because I reset the version number...

It has been broken out from "[PATCH v2 00/10] sh73a0 common clock framework
implementation" and should go through Simon's tree as discussed earlier.

CU
Uli


 .../bindings/clock/renesas,sh73a0-cpg-clocks.txt   |  31 ++++
 drivers/clk/shmobile/Makefile                      |   1 +
 drivers/clk/shmobile/clk-sh73a0.c                  | 202 +++++++++++++++++++++
 3 files changed, 234 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt
 create mode 100644 drivers/clk/shmobile/clk-sh73a0.c

Comments

Simon Horman Sept. 9, 2014, 1:54 a.m. UTC | #1
On Mon, Sep 08, 2014 at 07:12:19PM +0200, Ulrich Hecht wrote:
> Driver for the SH73A0's clocks that are too specific to be supported by a
> generic driver.
> 
> Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
> ---
> 
> Hi!
> 
> This fell by the wayside, perhaps because I reset the version number...
> 
> It has been broken out from "[PATCH v2 00/10] sh73a0 common clock framework
> implementation" and should go through Simon's tree as discussed earlier.

Thanks, I believe I need an Ack from Mike before I take this patch.

> 
> CU
> Uli
> 
> 
>  .../bindings/clock/renesas,sh73a0-cpg-clocks.txt   |  31 ++++
>  drivers/clk/shmobile/Makefile                      |   1 +
>  drivers/clk/shmobile/clk-sh73a0.c                  | 202 +++++++++++++++++++++
>  3 files changed, 234 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt
>  create mode 100644 drivers/clk/shmobile/clk-sh73a0.c
> 
> diff --git a/Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt
> new file mode 100644
> index 0000000..6b8dece
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt
> @@ -0,0 +1,31 @@
> +These bindings should be considered EXPERIMENTAL for now.
> +
> +* Renesas SH73A0 Clock Pulse Generator (CPG)
> +
> +The CPG generates core clocks for the SH73A0 SoC. It includes four PLLs
> +and several fixed ratio dividers.
> +
> +Required Properties:
> +
> +  - compatible: Must be "renesas,sh73a0-cpg-clocks"
> +
> +  - reg: Base address and length of the memory resource used by the CPG
> +
> +  - clocks: Reference to the parent clocks
> +  - #clock-cells: Must be 1
> +  - clock-output-names: The names of the clocks. Supported clocks are "main",
> +    "pll0", "pll1", "pll2", "pll3", "z", "dsi0phy", "dsi1phy", and "twd"
> +
> +
> +Example
> +-------
> +
> +        cpg_clocks: cpg_clocks@e6150000 {
> +                compatible = "renesas,sh73a0-cpg-clocks";
> +                reg = <0 0xe6150000 0 0x10000>;
> +                clocks = <&extal1_clk>, <&extal2_clk>;
> +                #clock-cells = <1>;
> +                clock-output-names = "main", "pll0", "pll1", "pll2",
> +                                     "pll3", "z", "dsi0phy", "dsi1phy",
> +                                     "twd";
> +        };
> diff --git a/drivers/clk/shmobile/Makefile b/drivers/clk/shmobile/Makefile
> index 531d4f6..0c4fd11 100644
> --- a/drivers/clk/shmobile/Makefile
> +++ b/drivers/clk/shmobile/Makefile
> @@ -5,6 +5,7 @@ obj-$(CONFIG_ARCH_R8A7779)		+= clk-r8a7779.o
>  obj-$(CONFIG_ARCH_R8A7790)		+= clk-rcar-gen2.o
>  obj-$(CONFIG_ARCH_R8A7791)		+= clk-rcar-gen2.o
>  obj-$(CONFIG_ARCH_R8A7794)		+= clk-rcar-gen2.o
> +obj-$(CONFIG_ARCH_SH73A0)		+= clk-sh73a0.o
>  obj-$(CONFIG_ARCH_SHMOBILE_MULTI)	+= clk-div6.o
>  obj-$(CONFIG_ARCH_SHMOBILE_MULTI)	+= clk-mstp.o
>  # for emply built-in.o
> diff --git a/drivers/clk/shmobile/clk-sh73a0.c b/drivers/clk/shmobile/clk-sh73a0.c
> new file mode 100644
> index 0000000..9d45e9d
> --- /dev/null
> +++ b/drivers/clk/shmobile/clk-sh73a0.c
> @@ -0,0 +1,202 @@
> +/*
> + * sh73a0 Core CPG Clocks
> + *
> + * Copyright (C) 2014  Ulrich Hecht
> + *
> + * 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; version 2 of the License.
> + */
> +
> +#include <linux/clk-provider.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk/shmobile.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/spinlock.h>
> +
> +struct sh73a0_cpg {
> +	struct clk_onecell_data data;
> +	spinlock_t lock;
> +	void __iomem *reg;
> +};
> +
> +#define CPG_FRQCRA	0x00
> +#define CPG_FRQCRB	0x04
> +#define CPG_SD0CKCR	0x74
> +#define CPG_SD1CKCR	0x78
> +#define CPG_SD2CKCR	0x7c
> +#define CPG_PLLECR	0xd0
> +#define CPG_PLL0CR	0xd8
> +#define CPG_PLL1CR	0x28
> +#define CPG_PLL2CR	0x2c
> +#define CPG_PLL3CR	0xdc
> +#define CPG_CKSCR	0xc0
> +#define CPG_DSI0PHYCR	0x6c
> +#define CPG_DSI1PHYCR	0x70
> +
> +#define CLK_ENABLE_ON_INIT BIT(0)
> +
> +struct div4_clk {
> +	const char *name;
> +	const char *parent;
> +	unsigned int reg;
> +	unsigned int shift;
> +	unsigned int mask;
> +	int flags;
> +};
> +
> +static struct div4_clk div4_clks[] = {
> +	{ "zg", "pll0", CPG_FRQCRA, 16, 0x0d7f, CLK_ENABLE_ON_INIT },
> +	{ "m3", "pll1", CPG_FRQCRA, 12, 0x1dff, CLK_ENABLE_ON_INIT },
> +	{ "b",  "pll1", CPG_FRQCRA,  8, 0x0dff, CLK_ENABLE_ON_INIT },
> +	{ "m1", "pll1", CPG_FRQCRA,  4, 0x1dff, 0 },
> +	{ "m2", "pll1", CPG_FRQCRA,  0, 0x1dff, 0 },
> +	{ "z",  "pll0", CPG_FRQCRB, 24, 0x097f, 0 },
> +	{ "zx", "pll1", CPG_FRQCRB, 12, 0x0dff, 0 },
> +	{ "hp", "pll1", CPG_FRQCRB,  4, 0x0dff, 0 },
> +	{ NULL, 0, 0, 0, 0 },
> +};
> +
> +static const struct clk_div_table div4_div_table[] = {
> +	{ 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 }, { 5, 12 },
> +	{ 6, 16 }, { 7, 18 }, { 8, 24 }, { 10, 36 }, { 11, 48 },
> +	{ 12, 7 }, { 0, 0 }
> +};
> +
> +static struct clk * __init
> +sh73a0_cpg_register_clock(struct device_node *np, struct sh73a0_cpg *cpg,
> +			     const char *name)
> +{
> +	const struct clk_div_table *table = NULL;
> +	const char *parent_name;
> +	unsigned int shift, reg;
> +	unsigned int mult = 1;
> +	unsigned int div = 1;
> +
> +	if (!strcmp(name, "main")) {
> +		/* extal1, extal1_div2, extal2, extal2_div2 */
> +		parent_name = of_clk_get_parent_name(np,
> +			(clk_readl(cpg->reg + CPG_CKSCR) >> 28) & 3);
> +	} else if (!strncmp(name, "pll", 3)) {
> +		void __iomem *enable_reg = cpg->reg;
> +		u32 enable_bit = name[3] - '0';
> +
> +		parent_name = "main";
> +		switch (enable_bit) {
> +		case 0:
> +			enable_reg += CPG_PLL0CR;
> +			break;
> +		case 1:
> +			enable_reg += CPG_PLL1CR;
> +			break;
> +		case 2:
> +			enable_reg += CPG_PLL2CR;
> +			break;
> +		case 3:
> +			enable_reg += CPG_PLL3CR;
> +			break;
> +		default:
> +			return ERR_PTR(-EINVAL);
> +		}
> +		if (clk_readl(cpg->reg + CPG_PLLECR) & BIT(enable_bit)) {
> +			mult = ((clk_readl(enable_reg) >> 24) & 0x3f) + 1;
> +			/* handle CFG bit for PLL1 and PLL2 */
> +			if (enable_bit == 1 || enable_bit == 2)
> +				if (clk_readl(enable_reg) & BIT(20))
> +					mult *= 2;
> +		}
> +	} else if (!strcmp(name, "dsi0phy") || !strcmp(name, "dsi1phy")) {
> +		u32 phy_no = name[3] - '0';
> +		void __iomem *dsi_reg = cpg->reg +
> +			(phy_no ? CPG_DSI1PHYCR : CPG_DSI0PHYCR);
> +
> +		parent_name = phy_no ? "dsi1pck" : "dsi0pck";
> +		div = __raw_readl(dsi_reg);
> +		if (!(div & 0xb8000))
> +			div = 1;
> +		else
> +			div = (div & 0x3f) + 1;
> +	} else {
> +		struct div4_clk *c;
> +
> +		for (c = div4_clks; c->name; c++) {
> +			if (!strcmp(name, c->name)) {
> +				parent_name = c->parent;
> +				table = div4_div_table;
> +				reg = c->reg;
> +				shift = c->shift;
> +				break;
> +			}
> +		}
> +		if (!c->name)
> +			return ERR_PTR(-EINVAL);
> +	}
> +
> +	if (!table) {
> +		return clk_register_fixed_factor(NULL, name, parent_name, 0,
> +						 mult, div);
> +	} else {
> +		return clk_register_divider_table(NULL, name, parent_name, 0,
> +						  cpg->reg + reg, shift, 4, 0,
> +						  table, &cpg->lock);
> +	}
> +}
> +
> +static void __init sh73a0_cpg_clocks_init(struct device_node *np)
> +{
> +	struct sh73a0_cpg *cpg;
> +	struct clk **clks;
> +	unsigned int i;
> +	int num_clks;
> +
> +	num_clks = of_property_count_strings(np, "clock-output-names");
> +	if (num_clks < 0) {
> +		pr_err("%s: failed to count clocks\n", __func__);
> +		return;
> +	}
> +
> +	cpg = kzalloc(sizeof(*cpg), GFP_KERNEL);
> +	clks = kcalloc(num_clks, sizeof(*clks), GFP_KERNEL);
> +	if (cpg == NULL || clks == NULL) {
> +		/* We're leaking memory on purpose, there's no point in cleaning
> +		 * up as the system won't boot anyway.
> +		 */
> +		return;
> +	}
> +
> +	spin_lock_init(&cpg->lock);
> +
> +	cpg->data.clks = clks;
> +	cpg->data.clk_num = num_clks;
> +
> +	cpg->reg = of_iomap(np, 0);
> +	if (WARN_ON(cpg->reg == NULL))
> +		return;
> +
> +	/* Set SDHI clocks to a known state */
> +	clk_writel(0x108, cpg->reg + CPG_SD0CKCR);
> +	clk_writel(0x108, cpg->reg + CPG_SD1CKCR);
> +	clk_writel(0x108, cpg->reg + CPG_SD2CKCR);
> +
> +	for (i = 0; i < num_clks; ++i) {
> +		const char *name;
> +		struct clk *clk;
> +
> +		of_property_read_string_index(np, "clock-output-names", i,
> +					      &name);
> +
> +		clk = sh73a0_cpg_register_clock(np, cpg, name);
> +		if (IS_ERR(clk))
> +			pr_err("%s: failed to register %s %s clock (%ld)\n",
> +			       __func__, np->name, name, PTR_ERR(clk));
> +		else
> +			cpg->data.clks[i] = clk;
> +	}
> +
> +	of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data);
> +}
> +CLK_OF_DECLARE(sh73a0_cpg_clks, "renesas,sh73a0-cpg-clocks",
> +	       sh73a0_cpg_clocks_init);
> -- 
> 1.8.4.5
> 
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Mike Turquette Sept. 9, 2014, 8:10 p.m. UTC | #2
Quoting Simon Horman (2014-09-08 18:54:58)
> On Mon, Sep 08, 2014 at 07:12:19PM +0200, Ulrich Hecht wrote:
> > Driver for the SH73A0's clocks that are too specific to be supported by a
> > generic driver.
> > 
> > Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
> > ---
> > 
> > Hi!
> > 
> > This fell by the wayside, perhaps because I reset the version number...
> > 
> > It has been broken out from "[PATCH v2 00/10] sh73a0 common clock framework
> > implementation" and should go through Simon's tree as discussed earlier.
> 
> Thanks, I believe I need an Ack from Mike before I take this patch.

Acked-by: Mike Turquette <mturquette@linaro.org>

> 
> > 
> > CU
> > Uli
> > 
> > 
> >  .../bindings/clock/renesas,sh73a0-cpg-clocks.txt   |  31 ++++
> >  drivers/clk/shmobile/Makefile                      |   1 +
> >  drivers/clk/shmobile/clk-sh73a0.c                  | 202 +++++++++++++++++++++
> >  3 files changed, 234 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt
> >  create mode 100644 drivers/clk/shmobile/clk-sh73a0.c
> > 
> > diff --git a/Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt
> > new file mode 100644
> > index 0000000..6b8dece
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt
> > @@ -0,0 +1,31 @@
> > +These bindings should be considered EXPERIMENTAL for now.
> > +
> > +* Renesas SH73A0 Clock Pulse Generator (CPG)
> > +
> > +The CPG generates core clocks for the SH73A0 SoC. It includes four PLLs
> > +and several fixed ratio dividers.
> > +
> > +Required Properties:
> > +
> > +  - compatible: Must be "renesas,sh73a0-cpg-clocks"
> > +
> > +  - reg: Base address and length of the memory resource used by the CPG
> > +
> > +  - clocks: Reference to the parent clocks
> > +  - #clock-cells: Must be 1
> > +  - clock-output-names: The names of the clocks. Supported clocks are "main",
> > +    "pll0", "pll1", "pll2", "pll3", "z", "dsi0phy", "dsi1phy", and "twd"
> > +
> > +
> > +Example
> > +-------
> > +
> > +        cpg_clocks: cpg_clocks@e6150000 {
> > +                compatible = "renesas,sh73a0-cpg-clocks";
> > +                reg = <0 0xe6150000 0 0x10000>;
> > +                clocks = <&extal1_clk>, <&extal2_clk>;
> > +                #clock-cells = <1>;
> > +                clock-output-names = "main", "pll0", "pll1", "pll2",
> > +                                     "pll3", "z", "dsi0phy", "dsi1phy",
> > +                                     "twd";
> > +        };
> > diff --git a/drivers/clk/shmobile/Makefile b/drivers/clk/shmobile/Makefile
> > index 531d4f6..0c4fd11 100644
> > --- a/drivers/clk/shmobile/Makefile
> > +++ b/drivers/clk/shmobile/Makefile
> > @@ -5,6 +5,7 @@ obj-$(CONFIG_ARCH_R8A7779)            += clk-r8a7779.o
> >  obj-$(CONFIG_ARCH_R8A7790)           += clk-rcar-gen2.o
> >  obj-$(CONFIG_ARCH_R8A7791)           += clk-rcar-gen2.o
> >  obj-$(CONFIG_ARCH_R8A7794)           += clk-rcar-gen2.o
> > +obj-$(CONFIG_ARCH_SH73A0)            += clk-sh73a0.o
> >  obj-$(CONFIG_ARCH_SHMOBILE_MULTI)    += clk-div6.o
> >  obj-$(CONFIG_ARCH_SHMOBILE_MULTI)    += clk-mstp.o
> >  # for emply built-in.o
> > diff --git a/drivers/clk/shmobile/clk-sh73a0.c b/drivers/clk/shmobile/clk-sh73a0.c
> > new file mode 100644
> > index 0000000..9d45e9d
> > --- /dev/null
> > +++ b/drivers/clk/shmobile/clk-sh73a0.c
> > @@ -0,0 +1,202 @@
> > +/*
> > + * sh73a0 Core CPG Clocks
> > + *
> > + * Copyright (C) 2014  Ulrich Hecht
> > + *
> > + * 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; version 2 of the License.
> > + */
> > +
> > +#include <linux/clk-provider.h>
> > +#include <linux/clkdev.h>
> > +#include <linux/clk/shmobile.h>
> > +#include <linux/init.h>
> > +#include <linux/kernel.h>
> > +#include <linux/of.h>
> > +#include <linux/of_address.h>
> > +#include <linux/spinlock.h>
> > +
> > +struct sh73a0_cpg {
> > +     struct clk_onecell_data data;
> > +     spinlock_t lock;
> > +     void __iomem *reg;
> > +};
> > +
> > +#define CPG_FRQCRA   0x00
> > +#define CPG_FRQCRB   0x04
> > +#define CPG_SD0CKCR  0x74
> > +#define CPG_SD1CKCR  0x78
> > +#define CPG_SD2CKCR  0x7c
> > +#define CPG_PLLECR   0xd0
> > +#define CPG_PLL0CR   0xd8
> > +#define CPG_PLL1CR   0x28
> > +#define CPG_PLL2CR   0x2c
> > +#define CPG_PLL3CR   0xdc
> > +#define CPG_CKSCR    0xc0
> > +#define CPG_DSI0PHYCR        0x6c
> > +#define CPG_DSI1PHYCR        0x70
> > +
> > +#define CLK_ENABLE_ON_INIT BIT(0)
> > +
> > +struct div4_clk {
> > +     const char *name;
> > +     const char *parent;
> > +     unsigned int reg;
> > +     unsigned int shift;
> > +     unsigned int mask;
> > +     int flags;
> > +};
> > +
> > +static struct div4_clk div4_clks[] = {
> > +     { "zg", "pll0", CPG_FRQCRA, 16, 0x0d7f, CLK_ENABLE_ON_INIT },
> > +     { "m3", "pll1", CPG_FRQCRA, 12, 0x1dff, CLK_ENABLE_ON_INIT },
> > +     { "b",  "pll1", CPG_FRQCRA,  8, 0x0dff, CLK_ENABLE_ON_INIT },
> > +     { "m1", "pll1", CPG_FRQCRA,  4, 0x1dff, 0 },
> > +     { "m2", "pll1", CPG_FRQCRA,  0, 0x1dff, 0 },
> > +     { "z",  "pll0", CPG_FRQCRB, 24, 0x097f, 0 },
> > +     { "zx", "pll1", CPG_FRQCRB, 12, 0x0dff, 0 },
> > +     { "hp", "pll1", CPG_FRQCRB,  4, 0x0dff, 0 },
> > +     { NULL, 0, 0, 0, 0 },
> > +};
> > +
> > +static const struct clk_div_table div4_div_table[] = {
> > +     { 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 }, { 5, 12 },
> > +     { 6, 16 }, { 7, 18 }, { 8, 24 }, { 10, 36 }, { 11, 48 },
> > +     { 12, 7 }, { 0, 0 }
> > +};
> > +
> > +static struct clk * __init
> > +sh73a0_cpg_register_clock(struct device_node *np, struct sh73a0_cpg *cpg,
> > +                          const char *name)
> > +{
> > +     const struct clk_div_table *table = NULL;
> > +     const char *parent_name;
> > +     unsigned int shift, reg;
> > +     unsigned int mult = 1;
> > +     unsigned int div = 1;
> > +
> > +     if (!strcmp(name, "main")) {
> > +             /* extal1, extal1_div2, extal2, extal2_div2 */
> > +             parent_name = of_clk_get_parent_name(np,
> > +                     (clk_readl(cpg->reg + CPG_CKSCR) >> 28) & 3);
> > +     } else if (!strncmp(name, "pll", 3)) {
> > +             void __iomem *enable_reg = cpg->reg;
> > +             u32 enable_bit = name[3] - '0';
> > +
> > +             parent_name = "main";
> > +             switch (enable_bit) {
> > +             case 0:
> > +                     enable_reg += CPG_PLL0CR;
> > +                     break;
> > +             case 1:
> > +                     enable_reg += CPG_PLL1CR;
> > +                     break;
> > +             case 2:
> > +                     enable_reg += CPG_PLL2CR;
> > +                     break;
> > +             case 3:
> > +                     enable_reg += CPG_PLL3CR;
> > +                     break;
> > +             default:
> > +                     return ERR_PTR(-EINVAL);
> > +             }
> > +             if (clk_readl(cpg->reg + CPG_PLLECR) & BIT(enable_bit)) {
> > +                     mult = ((clk_readl(enable_reg) >> 24) & 0x3f) + 1;
> > +                     /* handle CFG bit for PLL1 and PLL2 */
> > +                     if (enable_bit == 1 || enable_bit == 2)
> > +                             if (clk_readl(enable_reg) & BIT(20))
> > +                                     mult *= 2;
> > +             }
> > +     } else if (!strcmp(name, "dsi0phy") || !strcmp(name, "dsi1phy")) {
> > +             u32 phy_no = name[3] - '0';
> > +             void __iomem *dsi_reg = cpg->reg +
> > +                     (phy_no ? CPG_DSI1PHYCR : CPG_DSI0PHYCR);
> > +
> > +             parent_name = phy_no ? "dsi1pck" : "dsi0pck";
> > +             div = __raw_readl(dsi_reg);
> > +             if (!(div & 0xb8000))
> > +                     div = 1;
> > +             else
> > +                     div = (div & 0x3f) + 1;
> > +     } else {
> > +             struct div4_clk *c;
> > +
> > +             for (c = div4_clks; c->name; c++) {
> > +                     if (!strcmp(name, c->name)) {
> > +                             parent_name = c->parent;
> > +                             table = div4_div_table;
> > +                             reg = c->reg;
> > +                             shift = c->shift;
> > +                             break;
> > +                     }
> > +             }
> > +             if (!c->name)
> > +                     return ERR_PTR(-EINVAL);
> > +     }
> > +
> > +     if (!table) {
> > +             return clk_register_fixed_factor(NULL, name, parent_name, 0,
> > +                                              mult, div);
> > +     } else {
> > +             return clk_register_divider_table(NULL, name, parent_name, 0,
> > +                                               cpg->reg + reg, shift, 4, 0,
> > +                                               table, &cpg->lock);
> > +     }
> > +}
> > +
> > +static void __init sh73a0_cpg_clocks_init(struct device_node *np)
> > +{
> > +     struct sh73a0_cpg *cpg;
> > +     struct clk **clks;
> > +     unsigned int i;
> > +     int num_clks;
> > +
> > +     num_clks = of_property_count_strings(np, "clock-output-names");
> > +     if (num_clks < 0) {
> > +             pr_err("%s: failed to count clocks\n", __func__);
> > +             return;
> > +     }
> > +
> > +     cpg = kzalloc(sizeof(*cpg), GFP_KERNEL);
> > +     clks = kcalloc(num_clks, sizeof(*clks), GFP_KERNEL);
> > +     if (cpg == NULL || clks == NULL) {
> > +             /* We're leaking memory on purpose, there's no point in cleaning
> > +              * up as the system won't boot anyway.
> > +              */
> > +             return;
> > +     }
> > +
> > +     spin_lock_init(&cpg->lock);
> > +
> > +     cpg->data.clks = clks;
> > +     cpg->data.clk_num = num_clks;
> > +
> > +     cpg->reg = of_iomap(np, 0);
> > +     if (WARN_ON(cpg->reg == NULL))
> > +             return;
> > +
> > +     /* Set SDHI clocks to a known state */
> > +     clk_writel(0x108, cpg->reg + CPG_SD0CKCR);
> > +     clk_writel(0x108, cpg->reg + CPG_SD1CKCR);
> > +     clk_writel(0x108, cpg->reg + CPG_SD2CKCR);
> > +
> > +     for (i = 0; i < num_clks; ++i) {
> > +             const char *name;
> > +             struct clk *clk;
> > +
> > +             of_property_read_string_index(np, "clock-output-names", i,
> > +                                           &name);
> > +
> > +             clk = sh73a0_cpg_register_clock(np, cpg, name);
> > +             if (IS_ERR(clk))
> > +                     pr_err("%s: failed to register %s %s clock (%ld)\n",
> > +                            __func__, np->name, name, PTR_ERR(clk));
> > +             else
> > +                     cpg->data.clks[i] = clk;
> > +     }
> > +
> > +     of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data);
> > +}
> > +CLK_OF_DECLARE(sh73a0_cpg_clks, "renesas,sh73a0-cpg-clocks",
> > +            sh73a0_cpg_clocks_init);
> > -- 
> > 1.8.4.5
> > 
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diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt
new file mode 100644
index 0000000..6b8dece
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/renesas,sh73a0-cpg-clocks.txt
@@ -0,0 +1,31 @@ 
+These bindings should be considered EXPERIMENTAL for now.
+
+* Renesas SH73A0 Clock Pulse Generator (CPG)
+
+The CPG generates core clocks for the SH73A0 SoC. It includes four PLLs
+and several fixed ratio dividers.
+
+Required Properties:
+
+  - compatible: Must be "renesas,sh73a0-cpg-clocks"
+
+  - reg: Base address and length of the memory resource used by the CPG
+
+  - clocks: Reference to the parent clocks
+  - #clock-cells: Must be 1
+  - clock-output-names: The names of the clocks. Supported clocks are "main",
+    "pll0", "pll1", "pll2", "pll3", "z", "dsi0phy", "dsi1phy", and "twd"
+
+
+Example
+-------
+
+        cpg_clocks: cpg_clocks@e6150000 {
+                compatible = "renesas,sh73a0-cpg-clocks";
+                reg = <0 0xe6150000 0 0x10000>;
+                clocks = <&extal1_clk>, <&extal2_clk>;
+                #clock-cells = <1>;
+                clock-output-names = "main", "pll0", "pll1", "pll2",
+                                     "pll3", "z", "dsi0phy", "dsi1phy",
+                                     "twd";
+        };
diff --git a/drivers/clk/shmobile/Makefile b/drivers/clk/shmobile/Makefile
index 531d4f6..0c4fd11 100644
--- a/drivers/clk/shmobile/Makefile
+++ b/drivers/clk/shmobile/Makefile
@@ -5,6 +5,7 @@  obj-$(CONFIG_ARCH_R8A7779)		+= clk-r8a7779.o
 obj-$(CONFIG_ARCH_R8A7790)		+= clk-rcar-gen2.o
 obj-$(CONFIG_ARCH_R8A7791)		+= clk-rcar-gen2.o
 obj-$(CONFIG_ARCH_R8A7794)		+= clk-rcar-gen2.o
+obj-$(CONFIG_ARCH_SH73A0)		+= clk-sh73a0.o
 obj-$(CONFIG_ARCH_SHMOBILE_MULTI)	+= clk-div6.o
 obj-$(CONFIG_ARCH_SHMOBILE_MULTI)	+= clk-mstp.o
 # for emply built-in.o
diff --git a/drivers/clk/shmobile/clk-sh73a0.c b/drivers/clk/shmobile/clk-sh73a0.c
new file mode 100644
index 0000000..9d45e9d
--- /dev/null
+++ b/drivers/clk/shmobile/clk-sh73a0.c
@@ -0,0 +1,202 @@ 
+/*
+ * sh73a0 Core CPG Clocks
+ *
+ * Copyright (C) 2014  Ulrich Hecht
+ *
+ * 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; version 2 of the License.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clk/shmobile.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/spinlock.h>
+
+struct sh73a0_cpg {
+	struct clk_onecell_data data;
+	spinlock_t lock;
+	void __iomem *reg;
+};
+
+#define CPG_FRQCRA	0x00
+#define CPG_FRQCRB	0x04
+#define CPG_SD0CKCR	0x74
+#define CPG_SD1CKCR	0x78
+#define CPG_SD2CKCR	0x7c
+#define CPG_PLLECR	0xd0
+#define CPG_PLL0CR	0xd8
+#define CPG_PLL1CR	0x28
+#define CPG_PLL2CR	0x2c
+#define CPG_PLL3CR	0xdc
+#define CPG_CKSCR	0xc0
+#define CPG_DSI0PHYCR	0x6c
+#define CPG_DSI1PHYCR	0x70
+
+#define CLK_ENABLE_ON_INIT BIT(0)
+
+struct div4_clk {
+	const char *name;
+	const char *parent;
+	unsigned int reg;
+	unsigned int shift;
+	unsigned int mask;
+	int flags;
+};
+
+static struct div4_clk div4_clks[] = {
+	{ "zg", "pll0", CPG_FRQCRA, 16, 0x0d7f, CLK_ENABLE_ON_INIT },
+	{ "m3", "pll1", CPG_FRQCRA, 12, 0x1dff, CLK_ENABLE_ON_INIT },
+	{ "b",  "pll1", CPG_FRQCRA,  8, 0x0dff, CLK_ENABLE_ON_INIT },
+	{ "m1", "pll1", CPG_FRQCRA,  4, 0x1dff, 0 },
+	{ "m2", "pll1", CPG_FRQCRA,  0, 0x1dff, 0 },
+	{ "z",  "pll0", CPG_FRQCRB, 24, 0x097f, 0 },
+	{ "zx", "pll1", CPG_FRQCRB, 12, 0x0dff, 0 },
+	{ "hp", "pll1", CPG_FRQCRB,  4, 0x0dff, 0 },
+	{ NULL, 0, 0, 0, 0 },
+};
+
+static const struct clk_div_table div4_div_table[] = {
+	{ 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 }, { 5, 12 },
+	{ 6, 16 }, { 7, 18 }, { 8, 24 }, { 10, 36 }, { 11, 48 },
+	{ 12, 7 }, { 0, 0 }
+};
+
+static struct clk * __init
+sh73a0_cpg_register_clock(struct device_node *np, struct sh73a0_cpg *cpg,
+			     const char *name)
+{
+	const struct clk_div_table *table = NULL;
+	const char *parent_name;
+	unsigned int shift, reg;
+	unsigned int mult = 1;
+	unsigned int div = 1;
+
+	if (!strcmp(name, "main")) {
+		/* extal1, extal1_div2, extal2, extal2_div2 */
+		parent_name = of_clk_get_parent_name(np,
+			(clk_readl(cpg->reg + CPG_CKSCR) >> 28) & 3);
+	} else if (!strncmp(name, "pll", 3)) {
+		void __iomem *enable_reg = cpg->reg;
+		u32 enable_bit = name[3] - '0';
+
+		parent_name = "main";
+		switch (enable_bit) {
+		case 0:
+			enable_reg += CPG_PLL0CR;
+			break;
+		case 1:
+			enable_reg += CPG_PLL1CR;
+			break;
+		case 2:
+			enable_reg += CPG_PLL2CR;
+			break;
+		case 3:
+			enable_reg += CPG_PLL3CR;
+			break;
+		default:
+			return ERR_PTR(-EINVAL);
+		}
+		if (clk_readl(cpg->reg + CPG_PLLECR) & BIT(enable_bit)) {
+			mult = ((clk_readl(enable_reg) >> 24) & 0x3f) + 1;
+			/* handle CFG bit for PLL1 and PLL2 */
+			if (enable_bit == 1 || enable_bit == 2)
+				if (clk_readl(enable_reg) & BIT(20))
+					mult *= 2;
+		}
+	} else if (!strcmp(name, "dsi0phy") || !strcmp(name, "dsi1phy")) {
+		u32 phy_no = name[3] - '0';
+		void __iomem *dsi_reg = cpg->reg +
+			(phy_no ? CPG_DSI1PHYCR : CPG_DSI0PHYCR);
+
+		parent_name = phy_no ? "dsi1pck" : "dsi0pck";
+		div = __raw_readl(dsi_reg);
+		if (!(div & 0xb8000))
+			div = 1;
+		else
+			div = (div & 0x3f) + 1;
+	} else {
+		struct div4_clk *c;
+
+		for (c = div4_clks; c->name; c++) {
+			if (!strcmp(name, c->name)) {
+				parent_name = c->parent;
+				table = div4_div_table;
+				reg = c->reg;
+				shift = c->shift;
+				break;
+			}
+		}
+		if (!c->name)
+			return ERR_PTR(-EINVAL);
+	}
+
+	if (!table) {
+		return clk_register_fixed_factor(NULL, name, parent_name, 0,
+						 mult, div);
+	} else {
+		return clk_register_divider_table(NULL, name, parent_name, 0,
+						  cpg->reg + reg, shift, 4, 0,
+						  table, &cpg->lock);
+	}
+}
+
+static void __init sh73a0_cpg_clocks_init(struct device_node *np)
+{
+	struct sh73a0_cpg *cpg;
+	struct clk **clks;
+	unsigned int i;
+	int num_clks;
+
+	num_clks = of_property_count_strings(np, "clock-output-names");
+	if (num_clks < 0) {
+		pr_err("%s: failed to count clocks\n", __func__);
+		return;
+	}
+
+	cpg = kzalloc(sizeof(*cpg), GFP_KERNEL);
+	clks = kcalloc(num_clks, sizeof(*clks), GFP_KERNEL);
+	if (cpg == NULL || clks == NULL) {
+		/* We're leaking memory on purpose, there's no point in cleaning
+		 * up as the system won't boot anyway.
+		 */
+		return;
+	}
+
+	spin_lock_init(&cpg->lock);
+
+	cpg->data.clks = clks;
+	cpg->data.clk_num = num_clks;
+
+	cpg->reg = of_iomap(np, 0);
+	if (WARN_ON(cpg->reg == NULL))
+		return;
+
+	/* Set SDHI clocks to a known state */
+	clk_writel(0x108, cpg->reg + CPG_SD0CKCR);
+	clk_writel(0x108, cpg->reg + CPG_SD1CKCR);
+	clk_writel(0x108, cpg->reg + CPG_SD2CKCR);
+
+	for (i = 0; i < num_clks; ++i) {
+		const char *name;
+		struct clk *clk;
+
+		of_property_read_string_index(np, "clock-output-names", i,
+					      &name);
+
+		clk = sh73a0_cpg_register_clock(np, cpg, name);
+		if (IS_ERR(clk))
+			pr_err("%s: failed to register %s %s clock (%ld)\n",
+			       __func__, np->name, name, PTR_ERR(clk));
+		else
+			cpg->data.clks[i] = clk;
+	}
+
+	of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data);
+}
+CLK_OF_DECLARE(sh73a0_cpg_clks, "renesas,sh73a0-cpg-clocks",
+	       sh73a0_cpg_clocks_init);