clk: shmobile: Add R-Car Gen2 clocks support
The R-Car Gen2 SoCs (R8A7790 and R8A7791) have several clocks that are too custom to be supported in a generic driver. Those clocks can be divided in two categories: - Fixed rate clocks with multiplier and divisor set according to boot mode configuration - Custom divider clocks with SoC-specific divider values This driver supports both. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: Kumar Gala <galak@codeaurora.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Laurent Pinchart
Mike Turquette
parent
6ce4eac1f6
commit
10cdfe9f32
@ -0,0 +1,32 @@
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* Renesas R-Car Gen2 Clock Pulse Generator (CPG)
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The CPG generates core clocks for the R-Car Gen2 SoCs. It includes three PLLs
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and several fixed ratio dividers.
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Required Properties:
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- compatible: Must be one of
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- "renesas,r8a7790-cpg-clocks" for the r8a7790 CPG
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- "renesas,r8a7791-cpg-clocks" for the r8a7791 CPG
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- "renesas,rcar-gen2-cpg-clocks" for the generic R-Car Gen2 CPG
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- reg: Base address and length of the memory resource used by the CPG
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- clocks: Reference to the parent clock
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- #clock-cells: Must be 1
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- clock-output-names: The names of the clocks. Supported clocks are "main",
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"pll0", "pll1", "pll3", "lb", "qspi", "sdh", "sd0", "sd1" and "z"
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Example
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-------
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cpg_clocks: cpg_clocks@e6150000 {
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compatible = "renesas,r8a7790-cpg-clocks",
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"renesas,rcar-gen2-cpg-clocks";
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reg = <0 0xe6150000 0 0x1000>;
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clocks = <&extal_clk>;
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#clock-cells = <1>;
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clock-output-names = "main", "pll0, "pll1", "pll3",
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"lb", "qspi", "sdh", "sd0", "sd1", "z";
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};
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@ -35,6 +35,7 @@ obj-$(CONFIG_ARCH_TEGRA) += tegra/
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obj-$(CONFIG_PLAT_SAMSUNG) += samsung/
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obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o
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obj-$(CONFIG_COMMON_CLK_KEYSTONE) += keystone/
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obj-$(CONFIG_ARCH_SHMOBILE_MULTI) += shmobile/
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obj-$(CONFIG_X86) += x86/
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5
drivers/clk/shmobile/Makefile
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5
drivers/clk/shmobile/Makefile
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@ -0,0 +1,5 @@
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obj-$(CONFIG_ARCH_R8A7790) += clk-rcar-gen2.o
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obj-$(CONFIG_ARCH_R8A7791) += clk-rcar-gen2.o
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# for emply built-in.o
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obj-n := dummy
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298
drivers/clk/shmobile/clk-rcar-gen2.c
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298
drivers/clk/shmobile/clk-rcar-gen2.c
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@ -0,0 +1,298 @@
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/*
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* rcar_gen2 Core CPG Clocks
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*
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* Copyright (C) 2013 Ideas On Board SPRL
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*
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* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/shmobile.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/math64.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/spinlock.h>
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struct rcar_gen2_cpg {
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struct clk_onecell_data data;
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spinlock_t lock;
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void __iomem *reg;
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};
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#define CPG_SDCKCR 0x00000074
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#define CPG_PLL0CR 0x000000d8
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#define CPG_FRQCRC 0x000000e0
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#define CPG_FRQCRC_ZFC_MASK (0x1f << 8)
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#define CPG_FRQCRC_ZFC_SHIFT 8
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/* -----------------------------------------------------------------------------
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* Z Clock
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*
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* Traits of this clock:
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* prepare - clk_prepare only ensures that parents are prepared
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* enable - clk_enable only ensures that parents are enabled
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* rate - rate is adjustable. clk->rate = parent->rate * mult / 32
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* parent - fixed parent. No clk_set_parent support
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*/
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struct cpg_z_clk {
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struct clk_hw hw;
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void __iomem *reg;
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};
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#define to_z_clk(_hw) container_of(_hw, struct cpg_z_clk, hw)
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static unsigned long cpg_z_clk_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct cpg_z_clk *zclk = to_z_clk(hw);
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unsigned int mult;
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unsigned int val;
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val = (clk_readl(zclk->reg) & CPG_FRQCRC_ZFC_MASK)
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>> CPG_FRQCRC_ZFC_SHIFT;
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mult = 32 - val;
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return div_u64((u64)parent_rate * mult, 32);
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}
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static long cpg_z_clk_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *parent_rate)
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{
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unsigned long prate = *parent_rate;
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unsigned int mult;
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if (!prate)
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prate = 1;
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mult = div_u64((u64)rate * 32, prate);
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mult = clamp(mult, 1U, 32U);
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return *parent_rate / 32 * mult;
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}
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static int cpg_z_clk_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct cpg_z_clk *zclk = to_z_clk(hw);
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unsigned int mult;
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u32 val;
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mult = div_u64((u64)rate * 32, parent_rate);
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mult = clamp(mult, 1U, 32U);
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val = clk_readl(zclk->reg);
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val &= ~CPG_FRQCRC_ZFC_MASK;
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val |= (32 - mult) << CPG_FRQCRC_ZFC_SHIFT;
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clk_writel(val, zclk->reg);
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return 0;
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}
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static const struct clk_ops cpg_z_clk_ops = {
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.recalc_rate = cpg_z_clk_recalc_rate,
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.round_rate = cpg_z_clk_round_rate,
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.set_rate = cpg_z_clk_set_rate,
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};
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static struct clk * __init cpg_z_clk_register(struct rcar_gen2_cpg *cpg)
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{
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static const char *parent_name = "pll0";
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struct clk_init_data init;
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struct cpg_z_clk *zclk;
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struct clk *clk;
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zclk = kzalloc(sizeof(*zclk), GFP_KERNEL);
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if (!zclk)
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return ERR_PTR(-ENOMEM);
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init.name = "z";
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init.ops = &cpg_z_clk_ops;
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init.flags = 0;
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init.parent_names = &parent_name;
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init.num_parents = 1;
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zclk->reg = cpg->reg + CPG_FRQCRC;
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zclk->hw.init = &init;
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clk = clk_register(NULL, &zclk->hw);
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if (IS_ERR(clk))
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kfree(zclk);
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return clk;
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}
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/* -----------------------------------------------------------------------------
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* CPG Clock Data
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*/
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/*
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* MD EXTAL PLL0 PLL1 PLL3
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* 14 13 19 (MHz) *1 *1
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*---------------------------------------------------
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* 0 0 0 15 x 1 x172/2 x208/2 x106
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* 0 0 1 15 x 1 x172/2 x208/2 x88
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* 0 1 0 20 x 1 x130/2 x156/2 x80
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* 0 1 1 20 x 1 x130/2 x156/2 x66
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* 1 0 0 26 / 2 x200/2 x240/2 x122
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* 1 0 1 26 / 2 x200/2 x240/2 x102
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* 1 1 0 30 / 2 x172/2 x208/2 x106
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* 1 1 1 30 / 2 x172/2 x208/2 x88
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*
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* *1 : Table 7.6 indicates VCO ouput (PLLx = VCO/2)
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*/
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#define CPG_PLL_CONFIG_INDEX(md) ((((md) & BIT(14)) >> 12) | \
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(((md) & BIT(13)) >> 12) | \
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(((md) & BIT(19)) >> 19))
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struct cpg_pll_config {
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unsigned int extal_div;
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unsigned int pll1_mult;
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unsigned int pll3_mult;
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};
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static const struct cpg_pll_config cpg_pll_configs[8] __initconst = {
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{ 1, 208, 106 }, { 1, 208, 88 }, { 1, 156, 80 }, { 1, 156, 66 },
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{ 2, 240, 122 }, { 2, 240, 102 }, { 2, 208, 106 }, { 2, 208, 88 },
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};
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/* SDHI divisors */
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static const struct clk_div_table cpg_sdh_div_table[] = {
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{ 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 },
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{ 4, 8 }, { 5, 12 }, { 6, 16 }, { 7, 18 },
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{ 8, 24 }, { 10, 36 }, { 11, 48 }, { 0, 0 },
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};
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static const struct clk_div_table cpg_sd01_div_table[] = {
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{ 5, 12 }, { 6, 16 }, { 7, 18 }, { 8, 24 },
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{ 10, 36 }, { 11, 48 }, { 12, 10 }, { 0, 0 },
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};
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/* -----------------------------------------------------------------------------
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* Initialization
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*/
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static u32 cpg_mode __initdata;
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static struct clk * __init
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rcar_gen2_cpg_register_clock(struct device_node *np, struct rcar_gen2_cpg *cpg,
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const struct cpg_pll_config *config,
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const char *name)
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{
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const struct clk_div_table *table = NULL;
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const char *parent_name = "main";
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unsigned int shift;
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unsigned int mult = 1;
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unsigned int div = 1;
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if (!strcmp(name, "main")) {
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parent_name = of_clk_get_parent_name(np, 0);
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div = config->extal_div;
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} else if (!strcmp(name, "pll0")) {
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/* PLL0 is a configurable multiplier clock. Register it as a
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* fixed factor clock for now as there's no generic multiplier
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* clock implementation and we currently have no need to change
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* the multiplier value.
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*/
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u32 value = clk_readl(cpg->reg + CPG_PLL0CR);
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mult = ((value >> 24) & ((1 << 7) - 1)) + 1;
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} else if (!strcmp(name, "pll1")) {
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mult = config->pll1_mult / 2;
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} else if (!strcmp(name, "pll3")) {
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mult = config->pll3_mult;
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} else if (!strcmp(name, "lb")) {
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div = cpg_mode & BIT(18) ? 36 : 24;
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} else if (!strcmp(name, "qspi")) {
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div = (cpg_mode & (BIT(3) | BIT(2) | BIT(1))) == BIT(2)
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? 16 : 20;
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} else if (!strcmp(name, "sdh")) {
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table = cpg_sdh_div_table;
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shift = 8;
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} else if (!strcmp(name, "sd0")) {
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table = cpg_sd01_div_table;
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shift = 4;
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} else if (!strcmp(name, "sd1")) {
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table = cpg_sd01_div_table;
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shift = 0;
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} else if (!strcmp(name, "z")) {
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return cpg_z_clk_register(cpg);
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} else {
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return ERR_PTR(-EINVAL);
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}
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if (!table)
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return clk_register_fixed_factor(NULL, name, parent_name, 0,
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mult, div);
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else
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return clk_register_divider_table(NULL, name, parent_name, 0,
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cpg->reg + CPG_SDCKCR, shift,
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4, 0, table, &cpg->lock);
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}
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static void __init rcar_gen2_cpg_clocks_init(struct device_node *np)
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{
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const struct cpg_pll_config *config;
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struct rcar_gen2_cpg *cpg;
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struct clk **clks;
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unsigned int i;
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int num_clks;
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num_clks = of_property_count_strings(np, "clock-output-names");
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if (num_clks < 0) {
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pr_err("%s: failed to count clocks\n", __func__);
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return;
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}
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cpg = kzalloc(sizeof(*cpg), GFP_KERNEL);
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clks = kzalloc(num_clks * sizeof(*clks), GFP_KERNEL);
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if (cpg == NULL || clks == NULL) {
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/* We're leaking memory on purpose, there's no point in cleaning
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* up as the system won't boot anyway.
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*/
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pr_err("%s: failed to allocate cpg\n", __func__);
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return;
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}
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spin_lock_init(&cpg->lock);
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cpg->data.clks = clks;
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cpg->data.clk_num = num_clks;
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cpg->reg = of_iomap(np, 0);
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if (WARN_ON(cpg->reg == NULL))
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return;
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config = &cpg_pll_configs[CPG_PLL_CONFIG_INDEX(cpg_mode)];
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for (i = 0; i < num_clks; ++i) {
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const char *name;
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struct clk *clk;
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of_property_read_string_index(np, "clock-output-names", i,
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&name);
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clk = rcar_gen2_cpg_register_clock(np, cpg, config, name);
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if (IS_ERR(clk))
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pr_err("%s: failed to register %s %s clock (%ld)\n",
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__func__, np->name, name, PTR_ERR(clk));
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else
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cpg->data.clks[i] = clk;
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}
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of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data);
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}
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CLK_OF_DECLARE(rcar_gen2_cpg_clks, "renesas,rcar-gen2-cpg-clocks",
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rcar_gen2_cpg_clocks_init);
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void __init rcar_gen2_clocks_init(u32 mode)
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{
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cpg_mode = mode;
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of_clk_init(NULL);
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}
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19
include/linux/clk/shmobile.h
Normal file
19
include/linux/clk/shmobile.h
Normal file
@ -0,0 +1,19 @@
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/*
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* Copyright 2013 Ideas On Board SPRL
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*
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* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef __LINUX_CLK_SHMOBILE_H_
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#define __LINUX_CLK_SHMOBILE_H_
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#include <linux/types.h>
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void rcar_gen2_clocks_init(u32 mode);
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#endif
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