From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752863AbcF2Nls (ORCPT ); Wed, 29 Jun 2016 09:41:48 -0400 Received: from mail2.asahi-net.or.jp ([202.224.39.198]:64576 "EHLO mail2.asahi-net.or.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752785AbcF2NlU (ORCPT ); Wed, 29 Jun 2016 09:41:20 -0400 From: Yoshinori Sato To: linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Yoshinori Sato Subject: [PATCH v4 11/22] sh: SH7750/51 CPG Driver Date: Wed, 29 Jun 2016 22:40:56 +0900 Message-Id: <1467207667-15768-12-git-send-email-ysato@users.sourceforge.jp> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1467207667-15768-1-git-send-email-ysato@users.sourceforge.jp> References: <1467207667-15768-1-git-send-email-ysato@users.sourceforge.jp> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Convert SH specific clock framework to CCF. Changes v4 Add acked-by Signed-off-by: Yoshinori Sato Acked-by: Rob Herring --- .../bindings/clock/renesas,sh7750-cpg.txt | 25 ++ arch/sh/boards/Kconfig | 1 + arch/sh/kernel/cpu/Makefile | 8 +- arch/sh/kernel/cpu/clock.c | 6 +- drivers/clk/Kconfig | 1 + drivers/clk/Makefile | 3 +- drivers/clk/sh/Kconfig | 2 + drivers/clk/sh/Makefile | 1 + drivers/clk/sh/clk-sh7750cpg.c | 344 +++++++++++++++++++++ 9 files changed, 387 insertions(+), 4 deletions(-) create mode 100644 Documentation/devicetree/bindings/clock/renesas,sh7750-cpg.txt create mode 100644 drivers/clk/sh/Kconfig create mode 100644 drivers/clk/sh/Makefile create mode 100644 drivers/clk/sh/clk-sh7750cpg.c diff --git a/Documentation/devicetree/bindings/clock/renesas,sh7750-cpg.txt b/Documentation/devicetree/bindings/clock/renesas,sh7750-cpg.txt new file mode 100644 index 0000000..e763e2c --- /dev/null +++ b/Documentation/devicetree/bindings/clock/renesas,sh7750-cpg.txt @@ -0,0 +1,25 @@ +* Renesas SH7750/51 CPG + +Required Properties: + + - compatible: Must be "renesas,sh7750-cpg" + + - clocks: Reference to the parent clocks (xtal or external) + + - #clock-cells: Must be 1 + + - reg: Base address and length of the FREQCR + and Base address and length of the CLKSTP00 (optional) + + - renesas,mult: PLL1 multiply rate + +Example +------- + + cpg: cpg@ffc00000 { + compatible = "renesas,sh7750-cpg"; + clocks = <&oclk>; + #clock-cells = <1>; + renesas,mult = <12>; + reg = <0xffc00000 32>, <0xfe0a0000 16>; + }; diff --git a/arch/sh/boards/Kconfig b/arch/sh/boards/Kconfig index 9e4ccd0..b6ff9df 100644 --- a/arch/sh/boards/Kconfig +++ b/arch/sh/boards/Kconfig @@ -13,6 +13,7 @@ config SH_DEVICE_TREE select CLKSRC_OF select GENERIC_CALIBRATE_DELAY select GENERIC_IOMAP + select COMMON_CLK help Select Board Described by Device Tree to build a kernel that does not hard-code any board-specific knowledge but instead uses diff --git a/arch/sh/kernel/cpu/Makefile b/arch/sh/kernel/cpu/Makefile index accc7ca..22ad0ee 100644 --- a/arch/sh/kernel/cpu/Makefile +++ b/arch/sh/kernel/cpu/Makefile @@ -16,6 +16,10 @@ obj-$(CONFIG_ARCH_SHMOBILE) += shmobile/ # Common interfaces. obj-$(CONFIG_SH_ADC) += adc.o +ifndef CONFIG_COMMON_CLK obj-$(CONFIG_SH_CLK_CPG_LEGACY) += clock-cpg.o - -obj-y += irq/ init.o clock.o fpu.o pfc.o proc.o +endif +ifndef CONFIG_GENERIC_IRQ_CHIP +obj-y += irq/ +endif +obj-y += init.o clock.o fpu.o pfc.o proc.o diff --git a/arch/sh/kernel/cpu/clock.c b/arch/sh/kernel/cpu/clock.c index 4187cf4..8e66e23 100644 --- a/arch/sh/kernel/cpu/clock.c +++ b/arch/sh/kernel/cpu/clock.c @@ -22,13 +22,15 @@ int __init clk_init(void) { - int ret; + int ret = 0; +#ifndef CONFIG_COMMON_CLK ret = arch_clk_init(); if (unlikely(ret)) { pr_err("%s: CPU clock registration failed.\n", __func__); return ret; } +#endif if (sh_mv.mv_clk_init) { ret = sh_mv.mv_clk_init(); @@ -39,11 +41,13 @@ int __init clk_init(void) } } +#ifndef CONFIG_COMMON_CLK /* Kick the child clocks.. */ recalculate_root_clocks(); /* Enable the necessary init clocks */ clk_enable_init_clocks(); +#endif return ret; } diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 98efbfc..60d19d0 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -213,6 +213,7 @@ source "drivers/clk/mvebu/Kconfig" source "drivers/clk/qcom/Kconfig" source "drivers/clk/renesas/Kconfig" source "drivers/clk/samsung/Kconfig" +source "drivers/clk/sh/Kconfig" source "drivers/clk/tegra/Kconfig" source "drivers/clk/ti/Kconfig" diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index dcc5e69..c4bfbb9 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -86,5 +86,6 @@ obj-$(CONFIG_COMMON_CLK_VERSATILE) += versatile/ obj-$(CONFIG_X86) += x86/ obj-$(CONFIG_ARCH_ZX) += zte/ obj-$(CONFIG_ARCH_ZYNQ) += zynq/ -obj-$(CONFIG_H8300) += h8300/ +obj-$(CONFIG_H8300) += h8300/ obj-$(CONFIG_ARC_PLAT_AXS10X) += axs10x/ +obj-$(CONFIG_SUPERH) += sh/ diff --git a/drivers/clk/sh/Kconfig b/drivers/clk/sh/Kconfig new file mode 100644 index 0000000..2090415 --- /dev/null +++ b/drivers/clk/sh/Kconfig @@ -0,0 +1,2 @@ +config COMMON_CLK_SH7750 + bool "CPG driver for SH7750/SH7751" diff --git a/drivers/clk/sh/Makefile b/drivers/clk/sh/Makefile new file mode 100644 index 0000000..7ce4da3 --- /dev/null +++ b/drivers/clk/sh/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_COMMON_CLK_SH7750) += clk-sh7750cpg.o diff --git a/drivers/clk/sh/clk-sh7750cpg.c b/drivers/clk/sh/clk-sh7750cpg.c new file mode 100644 index 0000000..a538be4 --- /dev/null +++ b/drivers/clk/sh/clk-sh7750cpg.c @@ -0,0 +1,344 @@ +/* + * Renesas SH7750/51 clock driver + * + * Copyright 2016 Yoshinori Sato + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* Available FREQCR settings */ +static const int freqcr_table[] = { + 0x0400, 0x0401, 0x0402, 0x0403, 0x0404, 0x0408, + 0x0409, 0x040a, 0x040b, 0x040c, 0x0411, 0x0412, + 0x0413, 0x0414, 0x041a, 0x041b, 0x041c, 0x0423, + 0x0424, 0x0448, 0x0449, 0x044a, 0x044b, 0x044c, + 0x0451, 0x0452, 0x0453, 0x0454, 0x045a, 0x045b, + 0x045c, 0x0463, 0x0464, 0x0491, 0x0492, 0x0493, + 0x0494, 0x049a, 0x049b, 0x049c, 0x04a3, 0x04a4, + 0x04da, 0x04db, 0x04dc, 0x04e3, 0x04e4, 0x0523, + 0x0524, 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, + 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x0011, + 0x0012, 0x0013, 0x0014, 0x0019, 0x001a, 0x001b, + 0x001c, 0x0023, 0x0024, 0x0048, 0x0049, 0x004a, + 0x004b, 0x004c, 0x0051, 0x0052, 0x0053, 0x0054, + 0x0059, 0x005a, 0x005b, 0x005c, 0x0063, 0x0064, + 0x0091, 0x0092, 0x0093, 0x0094, 0x0099, 0x009a, + 0x009b, 0x009c, 0x00a3, 0x00a4, 0x00d1, 0x00d2, + 0x00d3, 0x00d4, 0x00d9, 0x00da, 0x00db, 0x00dc, + 0x00e3, 0x00e4, 0x0123, 0x0124, 0x0163, 0x0164, +}; + +struct priv { + void __iomem *freqcr; + void __iomem *clkstp; + int mult; + struct clk **clks; +}; + +struct cpg_clock { + struct clk_hw hw; + struct priv *priv; + int index; +}; + +struct clockname { + char *name; + int index; +}; + +static const struct clockname clocknames[] __initconst = { + { .name = "sci", .index = 0 }, + { .name = "rtc", .index = 1 }, + { .name = "tmu0", .index = 2 }, + { .name = "tmu1", .index = 2 }, + { .name = "tmu2", .index = 2 }, + { .name = "scif", .index = 3 }, + { .name = "dmac", .index = 4 }, + { .name = "ubc", .index = 8 }, + { .name = "sq", .index = 9 }, + { .name = "intc", .index = 16 }, + { .name = "tmu3", .index = 17 }, + { .name = "tmu4", .index = 17 }, + { .name = "pcic", .index = 18 }, + { .name = "core", .index = 128 }, +}; + +static const int iclk_div[] = {1, 2, 3, 4, 6, 8, 0, 0}; +static const int pclk_div[] = {2, 3, 4, 6, 8, 0, 0, 0}; + +static DEFINE_SPINLOCK(clklock); + +#define to_cpg_clock(_hw) container_of(_hw, struct cpg_clock, hw) + +static unsigned long pllout(u16 freqcr, unsigned long parent_rate, int mult) +{ + if ((freqcr >> 10) & 1) + return parent_rate * mult; + else + return parent_rate; +} + +static unsigned long cpg_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct cpg_clock *cpg_clock = to_cpg_clock(hw); + struct priv *priv = cpg_clock->priv; + unsigned long div; + u16 freqcr; + + freqcr = ioread16(priv->freqcr); + if (cpg_clock->index == 128) + div = iclk_div[(freqcr >> 6) & 7]; + else + div = pclk_div[freqcr & 7]; + return pllout(freqcr, parent_rate, priv->mult) / div; +} + +static u16 get_best_freqcr(unsigned long rate, + unsigned long pclk_rate, + unsigned long parent, int mult) +{ + int i; + int div; + u16 freqcr; + + for (i = 0; i < ARRAY_SIZE(freqcr_table); i++) { + freqcr = freqcr_table[i]; + if (pllout(freqcr, parent, mult) / pclk_div[freqcr & 7] + != pclk_rate) + continue; + div = iclk_div[(freqcr >> 6) & 7]; + if (pllout(freqcr, parent, mult) / div < rate) + return freqcr; + } + return 0; +} + +static long cpg_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct cpg_clock *cpg_clock = to_cpg_clock(hw); + struct priv *priv = cpg_clock->priv; + unsigned long pclk_rate; + u16 freqcr; + int div; + + freqcr = ioread16(priv->freqcr); + pclk_rate = pllout(freqcr, *prate, priv->mult) / pclk_div[freqcr & 7]; + + freqcr = get_best_freqcr(rate, pclk_rate, *prate, priv->mult); + if (cpg_clock->index == 128) + div = iclk_div[(freqcr >> 6) & 7]; + else + div = pclk_div[freqcr & 7]; + + return pllout(freqcr, *prate, priv->mult) / div; +} + +static int cpg_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct cpg_clock *cpg_clock = to_cpg_clock(hw); + struct priv *priv = cpg_clock->priv; + unsigned long flags; + unsigned long pclk_rate; + u16 freqcr, new_freqcr; + + if (cpg_clock->index != 128) + return 0; + + freqcr = ioread16(priv->freqcr); + pclk_rate = pllout(freqcr, parent_rate, priv->mult) / + pclk_div[freqcr & 7]; + + new_freqcr = get_best_freqcr(rate, pclk_rate, parent_rate, priv->mult); + + if ((freqcr & 0x0200) == 0 && (new_freqcr & 0x0200) != 0) { + /* PLL on */ + /* required stable time */ + spin_lock_irqsave(&clklock, flags); + iowrite16(0x5a00, priv->freqcr + 8); + iowrite16(0xa503, priv->freqcr + 12); + iowrite16(new_freqcr, priv->freqcr); + spin_unlock_irqrestore(&clklock, flags); + } else { + /* PLL state no change */ + /* not required stable time */ + iowrite16(new_freqcr, priv->freqcr); + } + return 0; +} + +static int cpg_enable(struct clk_hw *hw) +{ + struct cpg_clock *cpg_clock = to_cpg_clock(hw); + struct priv *priv = cpg_clock->priv; + u8 stbcr; + + switch ((cpg_clock->index >> 3) & 3) { + case 0: + /* STBCR */ + stbcr = ioread8(priv->freqcr + 4); + stbcr &= ~(1 << (cpg_clock->index & 7)); + iowrite8(stbcr, priv->freqcr + 4); + break; + case 1: + /* STBCR2 */ + stbcr = ioread8(priv->freqcr + 16); + stbcr &= ~(1 << (cpg_clock->index & 7)); + iowrite8(stbcr, priv->freqcr + 16); + break; + case 2: + /* CLKSTPCLR00 */ + iowrite32(1 << (cpg_clock->index - 16), priv->clkstp + 8); + break; + } + return 0; +} + +static void cpg_disable(struct clk_hw *hw) +{ + struct cpg_clock *cpg_clock = to_cpg_clock(hw); + struct priv *priv = cpg_clock->priv; + u8 stbcr; + + switch ((cpg_clock->index >> 3) & 3) { + case 0: + /* STBCR */ + stbcr = ioread8(priv->freqcr + 4); + stbcr |= (1 << (cpg_clock->index & 7)); + iowrite8(stbcr, priv->freqcr + 4); + break; + case 1: + /* STBCR2 */ + stbcr = ioread8(priv->freqcr + 16); + stbcr |= (1 << (cpg_clock->index & 7)); + iowrite8(stbcr, priv->freqcr + 16); + break; + case 2: + /* CLKSTP00 */ + iowrite32(1 << (cpg_clock->index - 16), priv->clkstp); + break; + } +} + +struct clk *sh7750_onecell_get(struct of_phandle_args *clkspec, void *data) +{ + struct priv *priv = data; + unsigned int idx = clkspec->args[0]; + + if (idx >= ARRAY_SIZE(clocknames)) { + pr_err("%s: invalid clock index %u\n", __func__, idx); + return ERR_PTR(-EINVAL); + } + + return priv->clks[idx]; +} + +static const struct clk_ops cpg_ops = { + .recalc_rate = cpg_recalc_rate, + .round_rate = cpg_round_rate, + .set_rate = cpg_set_rate, + .enable = cpg_enable, + .disable = cpg_disable, +}; + +static struct clk * __init sh7750_cpg_register(struct device_node *node, + const struct clockname *name, + const char *parent_name, + struct priv *priv) +{ + struct cpg_clock *cpg_clock; + struct clk_init_data init; + struct clk *clk; + + cpg_clock = kzalloc(sizeof(struct cpg_clock), GFP_KERNEL); + if (!cpg_clock) { + pr_err("%s: failed to alloc memory", name->name); + return NULL; + } + + init.name = name->name; + init.ops = &cpg_ops; + init.flags = CLK_IS_BASIC; + init.parent_names = &parent_name; + init.num_parents = 1; + cpg_clock->hw.init = &init; + cpg_clock->priv = priv; + cpg_clock->index = name->index; + + clk = clk_register(NULL, &cpg_clock->hw); + if (IS_ERR(clk)) { + pr_err("%s: failed to register %s pll clock (%ld)\n", + __func__, name->name, PTR_ERR(clk)); + return NULL; + } + return clk; +} + +static void __init sh7750_cpg_setup(struct device_node *node) +{ + const char *parent_name; + struct priv *priv; + int i; + + priv = kzalloc(sizeof(struct priv), GFP_KERNEL); + if (priv == NULL) { + pr_err("%s: failed to alloc memory", + node->name); + return; + } + priv->clks = kmalloc_array(sizeof(priv->clks), ARRAY_SIZE(clocknames), + GFP_KERNEL); + if (priv->clks == NULL) { + pr_err("%s: failed to alloc memory", + node->name); + kfree(priv); + return; + } + for (i = 0; i < ARRAY_SIZE(clocknames); i++) + priv->clks[i] = ERR_PTR(-ENOENT); + + priv->freqcr = of_iomap(node, 0); + if (priv->freqcr == NULL) { + pr_err("%s: failed to map frequenct control register", + node->name); + goto free_clock; + } + + /* Optional register */ + priv->clkstp = of_iomap(node, 1); + + of_property_read_u32_index(node, "renesas,mult", 0, &priv->mult); + + parent_name = of_clk_get_parent_name(node, 0); + + for (i = 0; i < ARRAY_SIZE(clocknames); i++) { + priv->clks[i] = sh7750_cpg_register(node, &clocknames[i], + parent_name, priv); + if (priv->clks[i] == NULL) + goto unmap_reg; + } + of_clk_add_provider(node, sh7750_onecell_get, priv); + return; + +unmap_reg: + if (priv->clkstp) + iounmap(priv->clkstp); + iounmap(priv->freqcr); +free_clock: + for (i = 0; i < ARRAY_SIZE(clocknames); i++) + if (priv->clks[i] != ERR_PTR(-ENOENT) && priv->clks[i]) + clk_unregister(priv->clks[i]); + kfree(priv->clks); + kfree(priv); +} + +CLK_OF_DECLARE(sh7750_cpg, "renesas,sh7750-cpg", sh7750_cpg_setup); -- 2.7.0