| Message ID | 1424968934-30577-3-git-send-email-ulrich.hecht+renesas@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 6232c51cb370919b116e0aea38d12aa33aae2fa9 |
| Headers | show |
On Thu, Feb 26, 2015 at 05:42:07PM +0100, Ulrich Hecht wrote: > Driver for the r8a7778's clocks that depend on the mode bits. > > Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com> > Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > Acked-by: Michael Turquette <mturquette@linaro.org> Thanks, I have queued this up. > --- > .../bindings/clock/renesas,r8a7778-cpg-clocks.txt | 25 ++++ > drivers/clk/shmobile/Makefile | 1 + > drivers/clk/shmobile/clk-r8a7778.c | 143 +++++++++++++++++++++ > include/linux/clk/shmobile.h | 1 + > 4 files changed, 170 insertions(+) > create mode 100644 Documentation/devicetree/bindings/clock/renesas,r8a7778-cpg-clocks.txt > create mode 100644 drivers/clk/shmobile/clk-r8a7778.c > > diff --git a/Documentation/devicetree/bindings/clock/renesas,r8a7778-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,r8a7778-cpg-clocks.txt > new file mode 100644 > index 0000000..2f3747f > --- /dev/null > +++ b/Documentation/devicetree/bindings/clock/renesas,r8a7778-cpg-clocks.txt > @@ -0,0 +1,25 @@ > +* Renesas R8A7778 Clock Pulse Generator (CPG) > + > +The CPG generates core clocks for the R8A7778. It includes two PLLs and > +several fixed ratio dividers > + > +Required Properties: > + > + - compatible: Must be "renesas,r8a7778-cpg-clocks" > + - reg: Base address and length of the memory resource used by the CPG > + - #clock-cells: Must be 1 > + - clock-output-names: The names of the clocks. Supported clocks are > + "plla", "pllb", "b", "out", "p", "s", and "s1". > + > + > +Example > +------- > + > + cpg_clocks: cpg_clocks@ffc80000 { > + compatible = "renesas,r8a7778-cpg-clocks"; > + reg = <0xffc80000 0x80>; > + #clock-cells = <1>; > + clocks = <&extal_clk>; > + clock-output-names = "plla", "pllb", "b", > + "out", "p", "s", "s1"; > + }; > diff --git a/drivers/clk/shmobile/Makefile b/drivers/clk/shmobile/Makefile > index 0689d7f..97c71c8 100644 > --- a/drivers/clk/shmobile/Makefile > +++ b/drivers/clk/shmobile/Makefile > @@ -2,6 +2,7 @@ obj-$(CONFIG_ARCH_EMEV2) += clk-emev2.o > obj-$(CONFIG_ARCH_R7S72100) += clk-rz.o > obj-$(CONFIG_ARCH_R8A73A4) += clk-r8a73a4.o > obj-$(CONFIG_ARCH_R8A7740) += clk-r8a7740.o > +obj-$(CONFIG_ARCH_R8A7778) += clk-r8a7778.o > obj-$(CONFIG_ARCH_R8A7779) += clk-r8a7779.o > obj-$(CONFIG_ARCH_R8A7790) += clk-rcar-gen2.o > obj-$(CONFIG_ARCH_R8A7791) += clk-rcar-gen2.o > diff --git a/drivers/clk/shmobile/clk-r8a7778.c b/drivers/clk/shmobile/clk-r8a7778.c > new file mode 100644 > index 0000000..cb33b57 > --- /dev/null > +++ b/drivers/clk/shmobile/clk-r8a7778.c > @@ -0,0 +1,143 @@ > +/* > + * r8a7778 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/of_address.h> > + > +struct r8a7778_cpg { > + struct clk_onecell_data data; > + spinlock_t lock; > + void __iomem *reg; > +}; > + > +/* PLL multipliers per bits 11, 12, and 18 of MODEMR */ > +struct { > + unsigned long plla_mult; > + unsigned long pllb_mult; > +} r8a7778_rates[] __initdata = { > + [0] = { 21, 21 }, > + [1] = { 24, 24 }, > + [2] = { 28, 28 }, > + [3] = { 32, 32 }, > + [5] = { 24, 21 }, > + [6] = { 28, 21 }, > + [7] = { 32, 24 }, > +}; > + > +/* Clock dividers per bits 1 and 2 of MODEMR */ > +struct { > + const char *name; > + unsigned int div[4]; > +} r8a7778_divs[6] __initdata = { > + { "b", { 12, 12, 16, 18 } }, > + { "out", { 12, 12, 16, 18 } }, > + { "p", { 16, 12, 16, 12 } }, > + { "s", { 4, 3, 4, 3 } }, > + { "s1", { 8, 6, 8, 6 } }, > +}; > + > +static u32 cpg_mode_rates __initdata; > +static u32 cpg_mode_divs __initdata; > + > +static struct clk * __init > +r8a7778_cpg_register_clock(struct device_node *np, struct r8a7778_cpg *cpg, > + const char *name) > +{ > + if (!strcmp(name, "plla")) { > + return clk_register_fixed_factor(NULL, "plla", > + of_clk_get_parent_name(np, 0), 0, > + r8a7778_rates[cpg_mode_rates].plla_mult, 1); > + } else if (!strcmp(name, "pllb")) { > + return clk_register_fixed_factor(NULL, "pllb", > + of_clk_get_parent_name(np, 0), 0, > + r8a7778_rates[cpg_mode_rates].pllb_mult, 1); > + } else { > + unsigned int i; > + > + for (i = 0; i < ARRAY_SIZE(r8a7778_divs); i++) { > + if (!strcmp(name, r8a7778_divs[i].name)) { > + return clk_register_fixed_factor(NULL, > + r8a7778_divs[i].name, > + "plla", 0, 1, > + r8a7778_divs[i].div[cpg_mode_divs]); > + } > + } > + } > + > + return ERR_PTR(-EINVAL); > +} > + > + > +static void __init r8a7778_cpg_clocks_init(struct device_node *np) > +{ > + struct r8a7778_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; > + > + 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 = r8a7778_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(r8a7778_cpg_clks, "renesas,r8a7778-cpg-clocks", > + r8a7778_cpg_clocks_init); > + > +void __init r8a7778_clocks_init(u32 mode) > +{ > + BUG_ON(!(mode & BIT(19))); > + > + cpg_mode_rates = (!!(mode & BIT(18)) << 2) | > + (!!(mode & BIT(12)) << 1) | > + (!!(mode & BIT(11))); > + cpg_mode_divs = (!!(mode & BIT(2)) << 1) | > + (!!(mode & BIT(1))); > + > + of_clk_init(NULL); > +} > diff --git a/include/linux/clk/shmobile.h b/include/linux/clk/shmobile.h > index 9f8a140..63a8159 100644 > --- a/include/linux/clk/shmobile.h > +++ b/include/linux/clk/shmobile.h > @@ -16,6 +16,7 @@ > > #include <linux/types.h> > > +void r8a7778_clocks_init(u32 mode); > void r8a7779_clocks_init(u32 mode); > void rcar_gen2_clocks_init(u32 mode); > > -- > 2.2.2 > > -- > 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
diff --git a/Documentation/devicetree/bindings/clock/renesas,r8a7778-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,r8a7778-cpg-clocks.txt new file mode 100644 index 0000000..2f3747f --- /dev/null +++ b/Documentation/devicetree/bindings/clock/renesas,r8a7778-cpg-clocks.txt @@ -0,0 +1,25 @@ +* Renesas R8A7778 Clock Pulse Generator (CPG) + +The CPG generates core clocks for the R8A7778. It includes two PLLs and +several fixed ratio dividers + +Required Properties: + + - compatible: Must be "renesas,r8a7778-cpg-clocks" + - reg: Base address and length of the memory resource used by the CPG + - #clock-cells: Must be 1 + - clock-output-names: The names of the clocks. Supported clocks are + "plla", "pllb", "b", "out", "p", "s", and "s1". + + +Example +------- + + cpg_clocks: cpg_clocks@ffc80000 { + compatible = "renesas,r8a7778-cpg-clocks"; + reg = <0xffc80000 0x80>; + #clock-cells = <1>; + clocks = <&extal_clk>; + clock-output-names = "plla", "pllb", "b", + "out", "p", "s", "s1"; + }; diff --git a/drivers/clk/shmobile/Makefile b/drivers/clk/shmobile/Makefile index 0689d7f..97c71c8 100644 --- a/drivers/clk/shmobile/Makefile +++ b/drivers/clk/shmobile/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_ARCH_EMEV2) += clk-emev2.o obj-$(CONFIG_ARCH_R7S72100) += clk-rz.o obj-$(CONFIG_ARCH_R8A73A4) += clk-r8a73a4.o obj-$(CONFIG_ARCH_R8A7740) += clk-r8a7740.o +obj-$(CONFIG_ARCH_R8A7778) += clk-r8a7778.o obj-$(CONFIG_ARCH_R8A7779) += clk-r8a7779.o obj-$(CONFIG_ARCH_R8A7790) += clk-rcar-gen2.o obj-$(CONFIG_ARCH_R8A7791) += clk-rcar-gen2.o diff --git a/drivers/clk/shmobile/clk-r8a7778.c b/drivers/clk/shmobile/clk-r8a7778.c new file mode 100644 index 0000000..cb33b57 --- /dev/null +++ b/drivers/clk/shmobile/clk-r8a7778.c @@ -0,0 +1,143 @@ +/* + * r8a7778 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/of_address.h> + +struct r8a7778_cpg { + struct clk_onecell_data data; + spinlock_t lock; + void __iomem *reg; +}; + +/* PLL multipliers per bits 11, 12, and 18 of MODEMR */ +struct { + unsigned long plla_mult; + unsigned long pllb_mult; +} r8a7778_rates[] __initdata = { + [0] = { 21, 21 }, + [1] = { 24, 24 }, + [2] = { 28, 28 }, + [3] = { 32, 32 }, + [5] = { 24, 21 }, + [6] = { 28, 21 }, + [7] = { 32, 24 }, +}; + +/* Clock dividers per bits 1 and 2 of MODEMR */ +struct { + const char *name; + unsigned int div[4]; +} r8a7778_divs[6] __initdata = { + { "b", { 12, 12, 16, 18 } }, + { "out", { 12, 12, 16, 18 } }, + { "p", { 16, 12, 16, 12 } }, + { "s", { 4, 3, 4, 3 } }, + { "s1", { 8, 6, 8, 6 } }, +}; + +static u32 cpg_mode_rates __initdata; +static u32 cpg_mode_divs __initdata; + +static struct clk * __init +r8a7778_cpg_register_clock(struct device_node *np, struct r8a7778_cpg *cpg, + const char *name) +{ + if (!strcmp(name, "plla")) { + return clk_register_fixed_factor(NULL, "plla", + of_clk_get_parent_name(np, 0), 0, + r8a7778_rates[cpg_mode_rates].plla_mult, 1); + } else if (!strcmp(name, "pllb")) { + return clk_register_fixed_factor(NULL, "pllb", + of_clk_get_parent_name(np, 0), 0, + r8a7778_rates[cpg_mode_rates].pllb_mult, 1); + } else { + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(r8a7778_divs); i++) { + if (!strcmp(name, r8a7778_divs[i].name)) { + return clk_register_fixed_factor(NULL, + r8a7778_divs[i].name, + "plla", 0, 1, + r8a7778_divs[i].div[cpg_mode_divs]); + } + } + } + + return ERR_PTR(-EINVAL); +} + + +static void __init r8a7778_cpg_clocks_init(struct device_node *np) +{ + struct r8a7778_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; + + 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 = r8a7778_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(r8a7778_cpg_clks, "renesas,r8a7778-cpg-clocks", + r8a7778_cpg_clocks_init); + +void __init r8a7778_clocks_init(u32 mode) +{ + BUG_ON(!(mode & BIT(19))); + + cpg_mode_rates = (!!(mode & BIT(18)) << 2) | + (!!(mode & BIT(12)) << 1) | + (!!(mode & BIT(11))); + cpg_mode_divs = (!!(mode & BIT(2)) << 1) | + (!!(mode & BIT(1))); + + of_clk_init(NULL); +} diff --git a/include/linux/clk/shmobile.h b/include/linux/clk/shmobile.h index 9f8a140..63a8159 100644 --- a/include/linux/clk/shmobile.h +++ b/include/linux/clk/shmobile.h @@ -16,6 +16,7 @@ #include <linux/types.h> +void r8a7778_clocks_init(u32 mode); void r8a7779_clocks_init(u32 mode); void rcar_gen2_clocks_init(u32 mode);