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Message-ID: <CAD7vxxJmsUNcusvct_eLkjdApP0DuTXzxisO1k_ixhHt4d_pMA@mail.gmail.com>
Date: Sat, 6 Dec 2014 14:20:41 -0800
From: Tim Kryger <tim.kryger@...il.com>
To: Ray Jui <rjui@...adcom.com>
Cc: Mike Turquette <mturquette@...aro.org>,
Matt Porter <mporter@...aro.org>,
Alex Elder <elder@...aro.org>,
Tim Kryger <tim.kryger@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Russell King <linux@....linux.org.uk>,
devicetree@...r.kernel.org, Scott Branden <sbranden@...adcom.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
bcm-kernel-feedback-list@...adcom.com,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] clk: iproc: add initial common clock support
On Thu, Dec 4, 2014 at 1:43 PM, Ray Jui <rjui@...adcom.com> wrote:
> This adds basic and generic support for various iProc PLLs and clocks
> including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.
>
> SoCs under the iProc architecture can define their specific register
> offsets and clock parameters for their PLL and clock controllers. These
> parameters can be passed as arugments into the generic iProc PLL and
> clock setup functions
>
> Derived from code originally provided by Jonathan Richardson
> <jonathar@...adcom.com>
>
> Signed-off-by: Ray Jui <rjui@...adcom.com>
> Reviewed-by: Scott Branden <sbranden@...adcom.com>
> ---
> drivers/clk/Makefile | 2 +-
> drivers/clk/bcm/Kconfig | 9 +
> drivers/clk/bcm/Makefile | 1 +
> drivers/clk/bcm/clk-iproc-armpll.c | 286 +++++++++++++++++++++
> drivers/clk/bcm/clk-iproc-asiu.c | 275 ++++++++++++++++++++
> drivers/clk/bcm/clk-iproc-clk.c | 238 ++++++++++++++++++
> drivers/clk/bcm/clk-iproc-pll.c | 483 ++++++++++++++++++++++++++++++++++++
> drivers/clk/bcm/clk-iproc.h | 155 ++++++++++++
> 8 files changed, 1448 insertions(+), 1 deletion(-)
> create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
> create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
> create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
> create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
> create mode 100644 drivers/clk/bcm/clk-iproc.h
>
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index d5fba5b..eff0213 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o
> obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
> obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o
> obj-$(CONFIG_COMMON_CLK_AT91) += at91/
> -obj-$(CONFIG_ARCH_BCM_MOBILE) += bcm/
> +obj-$(CONFIG_ARCH_BCM) += bcm/
> obj-$(CONFIG_ARCH_BERLIN) += berlin/
> obj-$(CONFIG_ARCH_HI3xxx) += hisilicon/
> obj-$(CONFIG_ARCH_HIP04) += hisilicon/
It may be best to move the above change into its own commit.
> diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
> index 75506e5..66b5b7f 100644
> --- a/drivers/clk/bcm/Kconfig
> +++ b/drivers/clk/bcm/Kconfig
> @@ -7,3 +7,12 @@ config CLK_BCM_KONA
> Enable common clock framework support for Broadcom SoCs
> using "Kona" style clock control units, including those
> in the BCM281xx and BCM21664 families.
> +
> +config COMMON_CLK_IPROC
> + bool "Broadcom iProc clock support"
> + depends on ARCH_BCM_IPROC
> + depends on COMMON_CLK
> + default y
> + help
> + Enable common clock framework support for Broadcom SoCs
> + based on the "iProc" architecture
> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
> index 6297d05..6926636 100644
> --- a/drivers/clk/bcm/Makefile
> +++ b/drivers/clk/bcm/Makefile
> @@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA) += clk-kona.o
> obj-$(CONFIG_CLK_BCM_KONA) += clk-kona-setup.o
> obj-$(CONFIG_CLK_BCM_KONA) += clk-bcm281xx.o
> obj-$(CONFIG_CLK_BCM_KONA) += clk-bcm21664.o
> +obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
> diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
> new file mode 100644
> index 0000000..ec9b130
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-armpll.c
> @@ -0,0 +1,286 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * 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.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +
> +#define IPROC_CLK_MAX_FREQ_POLICY 0x3
> +#define IPROC_CLK_POLICY_FREQ_OFFSET 0x008
> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT 8
> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK 0x7
> +
> +#define IPROC_CLK_PLLARMA_OFFSET 0xc00
> +#define IPROC_CLK_PLLARMA_LOCK_SHIFT 28
> +#define IPROC_CLK_PLLARMA_PDIV_SHIFT 24
> +#define IPROC_CLK_PLLARMA_PDIV_MASK 0xf
> +#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT 8
> +#define IPROC_CLK_PLLARMA_NDIV_INT_MASK 0x3ff
> +
> +#define IPROC_CLK_PLLARMB_OFFSET 0xc04
> +#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK 0xfffff
> +
> +#define IPROC_CLK_PLLARMC_OFFSET 0xc08
> +#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT 8
> +#define IPROC_CLK_PLLARMC_MDIV_MASK 0xff
> +
> +#define IPROC_CLK_PLLARMCTL5_OFFSET 0xc20
> +#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK 0xff
> +
> +#define IPROC_CLK_PLLARM_OFFSET_OFFSET 0xc24
> +#define IPROC_CLK_PLLARM_SW_CTL_SHIFT 29
> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT 20
> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK 0xff
> +#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK 0xfffff
> +
> +#define IPROC_CLK_ARM_DIV_OFFSET 0xe00
> +#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT 4
> +#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK 0xf
> +
> +#define IPROC_CLK_POLICY_DBG_OFFSET 0xec0
> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT 12
> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK 0x7
> +
> +enum iproc_arm_pll_fid {
> + ARM_PLL_FID_CRYSTAL_CLK = 0,
> + ARM_PLL_FID_SYS_CLK = 2,
> + ARM_PLL_FID_CH0_SLOW_CLK = 6,
> + ARM_PLL_FID_CH1_FAST_CLK = 7
> +};
> +
> +struct iproc_arm_pll {
> + struct clk_hw hw;
> + void __iomem *base;
> + struct clk_onecell_data clk_data;
> + unsigned long rate;
> +};
> +
> +#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
> +
> +static unsigned int __get_fid(struct iproc_arm_pll *pll)
> +{
> + u32 val;
> + unsigned int policy, fid, active_fid;
> +
> + val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
> + if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
> + policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
> + else
> + policy = 0;
> +
> + /* something is seriously wrong */
> + BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
> +
> + val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
> + fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
> + IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
> +
> + val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
> + active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
> + (val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
> + if (fid != active_fid) {
> + pr_debug("%s: fid override %u->%u\n", __func__, fid,
> + active_fid);
> + fid = active_fid;
> + }
> +
> + pr_debug("%s: active fid: %u\n", __func__, fid);
> +
> + return fid;
> +}
> +
> +/*
> + * Determine the mdiv (post divider) based on the frequency ID being used.
> + * There are 4 sources that can be used to derive the output clock rate:
> + * - 25 MHz Crystal
> + * - System clock
> + * - PLL channel 0 (slow clock)
> + * - PLL channel 1 (fast clock)
> + */
> +static int __get_mdiv(struct iproc_arm_pll *pll)
> +{
> + unsigned int fid;
> + int mdiv;
> + u32 val;
> +
> + fid = __get_fid(pll);
> +
> + switch (fid) {
> + case ARM_PLL_FID_CRYSTAL_CLK:
> + case ARM_PLL_FID_SYS_CLK:
> + mdiv = 1;
> + break;
> +
> + case ARM_PLL_FID_CH0_SLOW_CLK:
> + val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
> + mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
> + if (mdiv == 0)
> + mdiv = 256;
> + break;
> +
> + case ARM_PLL_FID_CH1_FAST_CLK:
> + val = readl(pll->base + IPROC_CLK_PLLARMCTL5_OFFSET);
> + mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
> + if (mdiv == 0)
> + mdiv = 256;
> + break;
> +
> + default:
> + mdiv = -EFAULT;
> + }
> +
> + return mdiv;
> +}
> +
> +static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
> +{
> + u32 val;
> + unsigned int ndiv_int, ndiv_frac, ndiv;
> +
> + val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
> + if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
> + /*
> + * offset mode is active. Read the ndiv from the PLLARM OFFSET
> + * register
> + */
> + ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
> + IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
> + if (ndiv_int == 0)
> + ndiv_int = 256;
> +
> + ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
> + } else {
> + /* offset mode not active */
> + val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
> + ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
> + IPROC_CLK_PLLARMA_NDIV_INT_MASK;
> + if (ndiv_int == 0)
> + ndiv_int = 1024;
> +
> + val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
> + ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
> + }
> +
> + ndiv = (ndiv_int << 20) | ndiv_frac;
> +
> + return ndiv;
> +}
> +
> +/*
> + * The output frequency of the ARM PLL is calculated based on the ARM PLL
> + * divider values:
> + * pdiv = ARM PLL pre-divider
> + * ndiv = ARM PLL multiplier
> + * mdiv = ARM PLL post divider
> + *
> + * The frequency is calculated by:
> + * ((ndiv * parent clock rate) / pdiv) / mdiv
> + */
> +static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
> + u32 val;
> + int mdiv;
> + u64 ndiv;
> + unsigned int pdiv;
> +
> + /* in bypass mode, use parent rate */
> + val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
> + if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
> + pll->rate = parent_rate;
> + return pll->rate;
> + }
> +
> + /* PLL needs to be locked */
> + val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
> + if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
> + pll->rate = 0;
> + return 0;
> + }
> +
> + pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
> + IPROC_CLK_PLLARMA_PDIV_MASK;
> + if (pdiv == 0)
> + pdiv = 16;
> +
> + ndiv = __get_ndiv(pll);
> + mdiv = __get_mdiv(pll);
> + if (mdiv <= 0) {
> + pll->rate = 0;
> + return 0;
> + }
> + pll->rate = (ndiv * parent_rate) >> 20;
> + pll->rate = (pll->rate / pdiv) / mdiv;
> +
> + pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
> + pll->rate, parent_rate);
> + pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
> + (unsigned int)(ndiv >> 20), pdiv, mdiv);
> +
> + return pll->rate;
> +}
> +
> +static const struct clk_ops iproc_arm_pll_ops = {
> + .recalc_rate = iproc_arm_pll_recalc_rate,
> +};
> +
> +void __init iproc_armpll_setup(struct device_node *node)
> +{
> + int ret;
> + struct clk *clk;
> + struct iproc_arm_pll *pll;
> + struct clk_init_data init;
> + const char *parent_name;
> +
> + pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> + if (WARN_ON(!pll))
> + return;
> +
> + pll->base = of_iomap(node, 0);
> + if (WARN_ON(!pll->base))
> + goto err_free_pll;
> +
> + init.name = node->name;
> + init.ops = &iproc_arm_pll_ops;
> + init.flags = 0;
> + parent_name = of_clk_get_parent_name(node, 0);
> + init.parent_names = (parent_name ? &parent_name : NULL);
> + init.num_parents = (parent_name ? 1 : 0);
> + pll->hw.init = &init;
> +
> + clk = clk_register(NULL, &pll->hw);
> + if (WARN_ON(IS_ERR(clk)))
> + goto err_iounmap;
> +
> + pll->clk_data.clk_num = 1;
> + pll->clk_data.clks = &clk;
> +
> + ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
> + if (WARN_ON(ret))
> + goto err_clk_unregister;
> +
> + return;
> +
> +err_clk_unregister:
> + clk_unregister(clk);
> +err_iounmap:
> + iounmap(pll->base);
> +err_free_pll:
> + kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
> new file mode 100644
> index 0000000..ab86b8c
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-asiu.c
> @@ -0,0 +1,275 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * 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.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +struct iproc_asiu;
> +
> +struct iproc_asiu_clk {
> + struct clk_hw hw;
> + const char *name;
> + struct iproc_asiu *asiu;
> + unsigned long rate;
> + struct iproc_asiu_div div;
> + struct iproc_asiu_gate gate;
> +};
> +
> +struct iproc_asiu {
> + void __iomem *div_base;
> + void __iomem *gate_base;
> +
> + struct clk_onecell_data clk_data;
> + struct iproc_asiu_clk *clks;
> +};
> +
> +#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
> +
> +static int iproc_asiu_clk_enable(struct clk_hw *hw)
> +{
> + struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> + struct iproc_asiu *asiu = clk->asiu;
> + u32 val;
> +
> + /* some clocks at the ASIU level are always enabled */
> + if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
> + return 0;
> +
> + val = readl(asiu->gate_base + clk->gate.offset);
> + val |= (1 << clk->gate.en_shift);
> + writel(val, asiu->gate_base + clk->gate.offset);
> +
> + return 0;
> +}
> +
> +static void iproc_asiu_clk_disable(struct clk_hw *hw)
> +{
> + struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> + struct iproc_asiu *asiu = clk->asiu;
> + u32 val;
> +
> + /* some clocks at the ASIU level are always enabled */
> + if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
> + return;
> +
> + val = readl(asiu->gate_base + clk->gate.offset);
> + val &= ~(1 << clk->gate.en_shift);
> + writel(val, asiu->gate_base + clk->gate.offset);
> +}
> +
> +static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> + struct iproc_asiu *asiu = clk->asiu;
> + u32 val;
> + unsigned int div_h, div_l;
> +
> + if (parent_rate == 0) {
> + clk->rate = 0;
> + return 0;
> + }
> +
> + /* if clock divisor is not enabled, simply return parent rate */
> + val = readl(asiu->div_base + clk->div.offset);
> + if ((val & (1 << clk->div.en_shift)) == 0) {
> + clk->rate = parent_rate;
> + return parent_rate;
> + }
> +
> + /* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
> + div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
> + div_h++;
> + div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
> + div_l++;
> +
> + clk->rate = parent_rate / (div_h + div_l);
> + pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
> + __func__, clk->rate, parent_rate, div_h, div_l);
> +
> + return clk->rate;
> +}
> +
> +static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long *parent_rate)
> +{
> + unsigned int div;
> +
> + if (rate == 0 || *parent_rate == 0)
> + return -EINVAL;
> +
> + if (rate == *parent_rate)
> + return *parent_rate;
> +
> + div = DIV_ROUND_UP(*parent_rate, rate);
> + if (div < 2)
> + return *parent_rate;
> +
> + return *parent_rate / div;
> +}
> +
> +static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long parent_rate)
> +{
> + struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> + struct iproc_asiu *asiu = clk->asiu;
> + unsigned int div, div_h, div_l;
> + u32 val;
> +
> + if (rate == 0 || parent_rate == 0)
> + return -EINVAL;
> +
> + /* simply disable the divisor if one wants the same rate as parent */
> + if (rate == parent_rate) {
> + val = readl(asiu->div_base + clk->div.offset);
> + val &= ~(1 << clk->div.en_shift);
> + writel(val, asiu->div_base + clk->div.offset);
> + return 0;
> + }
> +
> + div = DIV_ROUND_UP(parent_rate, rate);
> + if (div < 2)
> + return -EINVAL;
> +
> + div_h = div_l = div >> 1;
> + div_h--;
> + div_l--;
> +
> + val = readl(asiu->div_base + clk->div.offset);
> + val |= 1 << clk->div.en_shift;
> + if (div_h) {
> + val &= ~(bit_mask(clk->div.high_width)
> + << clk->div.high_shift);
> + val |= div_h << clk->div.high_shift;
> + } else {
> + val &= ~(bit_mask(clk->div.high_width)
> + << clk->div.high_shift);
> + }
> + if (div_l) {
> + val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
> + val |= div_l << clk->div.low_shift;
> + } else {
> + val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
> + }
> + writel(val, asiu->div_base + clk->div.offset);
> +
> + return 0;
> +}
> +
> +static const struct clk_ops iproc_asiu_ops = {
> + .enable = iproc_asiu_clk_enable,
> + .disable = iproc_asiu_clk_disable,
> + .recalc_rate = iproc_asiu_clk_recalc_rate,
> + .round_rate = iproc_asiu_clk_round_rate,
> + .set_rate = iproc_asiu_clk_set_rate,
> +};
> +
> +void __init iproc_asiu_setup(struct device_node *node,
> + const struct iproc_asiu_div *div,
> + const struct iproc_asiu_gate *gate, unsigned int num_clks)
> +{
> + int i, ret;
> + struct iproc_asiu *asiu;
> +
> + if (WARN_ON(!gate || !div))
> + return;
> +
> + asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
> + if (WARN_ON(!asiu))
> + return;
> +
> + asiu->clk_data.clk_num = num_clks;
> + asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
> + GFP_KERNEL);
> + if (WARN_ON(!asiu->clk_data.clks))
> + goto err_clks;
> +
> + asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
> + if (WARN_ON(!asiu->clks))
> + goto err_asiu_clks;
> +
> + asiu->div_base = of_iomap(node, 0);
> + if (WARN_ON(!asiu->div_base))
> + goto err_iomap_div;
> +
> + asiu->gate_base = of_iomap(node, 1);
> + if (WARN_ON(!asiu->gate_base))
> + goto err_iomap_gate;
> +
> + for (i = 0; i < num_clks; i++) {
> + struct clk_init_data init;
> + struct clk *clk;
> + const char *parent_name;
> + struct iproc_asiu_clk *asiu_clk;
> + const char *clk_name;
> +
> + clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
> + if (WARN_ON(!clk_name))
> + goto err_clk_register;
> +
> + ret = of_property_read_string_index(node, "clock-output-names",
> + i, &clk_name);
> + if (WARN_ON(ret))
> + goto err_clk_register;
> +
> + asiu_clk = &asiu->clks[i];
> + asiu_clk->name = clk_name;
> + asiu_clk->asiu = asiu;
> + asiu_clk->div = div[i];
> + asiu_clk->gate = gate[i];
> + init.name = clk_name;
> + init.ops = &iproc_asiu_ops;
> + init.flags = 0;
> + parent_name = of_clk_get_parent_name(node, 0);
> + init.parent_names = (parent_name ? &parent_name : NULL);
> + init.num_parents = (parent_name ? 1 : 0);
> + asiu_clk->hw.init = &init;
> +
> + clk = clk_register(NULL, &asiu_clk->hw);
> + if (WARN_ON(IS_ERR(clk)))
> + goto err_clk_register;
> + asiu->clk_data.clks[i] = clk;
> + }
> +
> + ret = of_clk_add_provider(node, of_clk_src_onecell_get,
> + &asiu->clk_data);
> + if (WARN_ON(ret))
> + goto err_clk_register;
> +
> + return;
> +
> +err_clk_register:
> + for (i = 0; i < num_clks; i++)
> + kfree(asiu->clks[i].name);
> + iounmap(asiu->gate_base);
> +
> +err_iomap_gate:
> + iounmap(asiu->div_base);
> +
> +err_iomap_div:
> + kfree(asiu->clks);
> +
> +err_asiu_clks:
> + kfree(asiu->clk_data.clks);
> +
> +err_clks:
> + kfree(asiu);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
> new file mode 100644
> index 0000000..be3c42c
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-clk.c
> @@ -0,0 +1,238 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * 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.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +struct iproc_pll;
> +
> +struct iproc_clk {
> + struct clk_hw hw;
> + const char *name;
> + struct iproc_pll *pll;
> + unsigned long rate;
> + const struct iproc_clk_ctrl *ctrl;
> +};
> +
> +struct iproc_pll {
> + void __iomem *base;
> + struct clk_onecell_data clk_data;
> + struct iproc_clk *clks;
> +};
> +
> +#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
> +
> +static int iproc_clk_enable(struct clk_hw *hw)
> +{
> + struct iproc_clk *clk = to_iproc_clk(hw);
> + const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> + struct iproc_pll *pll = clk->pll;
> + u32 val;
> +
> + /* channel enable is active low */
> + val = readl(pll->base + ctrl->enable.offset);
> + val &= ~(1 << ctrl->enable.enable_shift);
> + writel(val, pll->base + ctrl->enable.offset);
> +
> + /* also make sure channel is not held */
> + val = readl(pll->base + ctrl->enable.offset);
> + val &= ~(1 << ctrl->enable.hold_shift);
> + writel(val, pll->base + ctrl->enable.offset);
> +
> + return 0;
> +}
> +
> +static void iproc_clk_disable(struct clk_hw *hw)
> +{
> + struct iproc_clk *clk = to_iproc_clk(hw);
> + const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> + struct iproc_pll *pll = clk->pll;
> + u32 val;
> +
> + if (ctrl->flags & IPROC_CLK_AON)
> + return;
> +
> + val = readl(pll->base + ctrl->enable.offset);
> + val |= 1 << ctrl->enable.enable_shift;
> + writel(val, pll->base + ctrl->enable.offset);
> +}
> +
> +static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct iproc_clk *clk = to_iproc_clk(hw);
> + const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> + struct iproc_pll *pll = clk->pll;
> + u32 val;
> + unsigned int mdiv;
> +
> + if (parent_rate == 0)
> + return 0;
> +
> + val = readl(pll->base + ctrl->mdiv.offset);
> + mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
> + if (mdiv == 0)
> + mdiv = 256;
> +
> + clk->rate = parent_rate / mdiv;
> +
> + return clk->rate;
> +}
> +
> +static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long *parent_rate)
> +{
> + unsigned int div;
> +
> + if (rate == 0 || *parent_rate == 0)
> + return -EINVAL;
> +
> + if (rate == *parent_rate)
> + return *parent_rate;
> +
> + div = DIV_ROUND_UP(*parent_rate, rate);
> + if (div < 2)
> + return *parent_rate;
> +
> + if (div > 256)
> + div = 256;
> +
> + return *parent_rate / div;
> +}
> +
> +static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long parent_rate)
> +{
> + struct iproc_clk *clk = to_iproc_clk(hw);
> + const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> + struct iproc_pll *pll = clk->pll;
> + u32 val;
> + unsigned int div;
> +
> + if (rate == 0 || parent_rate == 0)
> + return -EINVAL;
> +
> + div = DIV_ROUND_UP(parent_rate, rate);
> + if (div > 256)
> + return -EINVAL;
> +
> + val = readl(pll->base + ctrl->mdiv.offset);
> + if (div == 256) {
> + val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
> + } else {
> + val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
> + val |= div << ctrl->mdiv.shift;
> + }
> + writel(val, pll->base + ctrl->mdiv.offset);
> + clk->rate = parent_rate / div;
> +
> + return 0;
> +}
> +
> +static const struct clk_ops iproc_clk_ops = {
> + .enable = iproc_clk_enable,
> + .disable = iproc_clk_disable,
> + .recalc_rate = iproc_clk_recalc_rate,
> + .round_rate = iproc_clk_round_rate,
> + .set_rate = iproc_clk_set_rate,
> +};
> +
> +void __init iproc_clk_setup(struct device_node *node,
> + const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
> +{
> + int i, ret;
> + struct iproc_pll *pll;
> +
> + if (WARN_ON(!ctrl))
> + return;
> +
> + pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> + if (WARN_ON(!pll))
> + return;
> +
> + pll->clk_data.clk_num = num_clks;
> + pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
> + GFP_KERNEL);
> + if (WARN_ON(!pll->clk_data.clks))
> + goto err_clks;
> +
> + pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
> + if (WARN_ON(!pll->clks))
> + goto err_pll_clks;
> +
> + pll->base = of_iomap(node, 0);
> + if (WARN_ON(!pll->base))
> + goto err_iomap;
> +
> + for (i = 0; i < num_clks; i++) {
> + struct clk_init_data init;
> + struct clk *clk;
> + const char *parent_name;
> + struct iproc_clk *iclk;
> + const char *clk_name;
> +
> + clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
> + if (WARN_ON(!clk_name))
> + goto err_clk_register;
> +
> + ret = of_property_read_string_index(node, "clock-output-names",
> + i, &clk_name);
> + if (WARN_ON(ret))
> + goto err_clk_register;
> +
> + iclk = &pll->clks[i];
> + iclk->name = clk_name;
> + iclk->pll = pll;
> + iclk->ctrl = &ctrl[i];
> + init.name = clk_name;
> + init.ops = &iproc_clk_ops;
> + init.flags = 0;
> + parent_name = of_clk_get_parent_name(node, 0);
> + init.parent_names = (parent_name ? &parent_name : NULL);
> + init.num_parents = (parent_name ? 1 : 0);
> + iclk->hw.init = &init;
> +
> + clk = clk_register(NULL, &iclk->hw);
> + if (WARN_ON(IS_ERR(clk)))
> + goto err_clk_register;
> + pll->clk_data.clks[i] = clk;
> + }
> +
> + ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
> + if (WARN_ON(ret))
> + goto err_clk_register;
> +
> + return;
> +
> +err_clk_register:
> + for (i = 0; i < num_clks; i++)
> + kfree(pll->clks[i].name);
> + iounmap(pll->base);
> +
> +err_iomap:
> + kfree(pll->clks);
> +
> +err_pll_clks:
> + kfree(pll->clk_data.clks);
> +
> +err_clks:
> + kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
> new file mode 100644
> index 0000000..cd3bd38
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-pll.c
> @@ -0,0 +1,483 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * 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.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +#define PLL_VCO_HIGH_SHIFT 19
> +#define PLL_VCO_LOW_SHIFT 30
> +
> +/* number of delay loops waiting for PLL to lock */
> +#define LOCK_DELAY 100
> +
> +/* number of VCO frequency bands */
> +#define NUM_FREQ_BANDS 8
> +
> +#define NUM_KP_BANDS 3
> +enum kp_band {
> + KP_BAND_MID = 0,
> + KP_BAND_HIGH,
> + KP_BAND_HIGH_HIGH
> +};
> +
> +static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
> + { 5, 6, 6, 7, 7, 8, 9, 10 },
> + { 4, 4, 5, 5, 6, 7, 8, 9 },
> + { 4, 5, 5, 6, 7, 8, 9, 10 },
> +};
> +
> +static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
> + { 10000000, 12500000 },
> + { 12500000, 15000000 },
> + { 15000000, 20000000 },
> + { 20000000, 25000000 },
> + { 25000000, 50000000 },
> + { 50000000, 75000000 },
> + { 75000000, 100000000 },
> + { 100000000, 125000000 },
> +};
> +
> +enum vco_freq_range {
> + VCO_LOW = 700000000U,
> + VCO_MID = 1200000000U,
> + VCO_HIGH = 2200000000U,
> + VCO_HIGH_HIGH = 3100000000U,
> + VCO_MAX = 4000000000U,
> +};
> +
> +struct iproc_pll {
> + struct clk_hw hw;
> + void __iomem *pll_base;
> + void __iomem *pwr_base;
> + void __iomem *asiu_base;
> + struct clk_onecell_data clk_data;
> + const char *name;
> + const struct iproc_pll_ctrl *ctrl;
> + const struct iproc_pll_vco_freq_param *vco_param;
> + unsigned int num_vco_entries;
> + unsigned long rate;
> +};
> +
> +#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
> +
> +/*
> + * Get the clock rate based on name
> + */
> +static unsigned long __get_rate(const char *clk_name)
> +{
> + struct clk *clk;
> +
> + clk = __clk_lookup(clk_name);
> + if (!clk) {
> + pr_err("%s: unable to find clock by name: %s\n", __func__,
> + clk_name);
> + return 0;
> + }
> +
> + return clk_get_rate(clk);
> +}
> +
> +/*
> + * Based on the target frequency, find a match from the VCO frequency parameter
> + * table and return its index
> + */
> +static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
> +{
> + int i;
> +
> + for (i = 0; i < pll->num_vco_entries; i++)
> + if (target_rate == pll->vco_param[i].rate)
> + break;
> +
> + if (i >= pll->num_vco_entries)
> + return -EINVAL;
> +
> + return i;
> +}
> +
> +static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
> +{
> + int i;
> +
> + if (ref_freq < ref_freq_table[0][0])
> + return -EINVAL;
> +
> + for (i = 0; i < NUM_FREQ_BANDS; i++) {
> + if (ref_freq >= ref_freq_table[i][0] &&
> + ref_freq < ref_freq_table[i][1])
> + return kp_table[kp_index][i];
> + }
> + return -EINVAL;
> +}
> +
> +static int pll_wait_for_lock(struct iproc_pll *pll)
> +{
> + int i;
> + const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +
> + for (i = 0; i < LOCK_DELAY; i++) {
> + u32 val = readl(pll->pll_base + ctrl->status.offset);
> +
> + if (val & (1 << ctrl->status.shift))
> + return 0;
> + udelay(10);
> + }
> +
> + return -EIO;
> +}
> +
> +static void __pll_disable(struct iproc_pll *pll)
> +{
> + const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> + u32 val;
> +
> + if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> + val = readl(pll->asiu_base + ctrl->asiu.offset);
> + val &= ~(1 << ctrl->asiu.en_shift);
> + writel(val, pll->asiu_base + ctrl->asiu.offset);
> + }
> +
> + /* latch input value so core power can be shut down */
> + val = readl(pll->pwr_base + ctrl->aon.offset);
> + val |= (1 << ctrl->aon.iso_shift);
> + writel(val, pll->pwr_base + ctrl->aon.offset);
> +
> + /* power down the core */
> + val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
> + writel(val, pll->pwr_base + ctrl->aon.offset);
> +}
> +
> +static int __pll_enable(struct iproc_pll *pll)
> +{
> + const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> + u32 val;
> +
> + /* power up the PLL and make sure it's not latched */
> + val = readl(pll->pwr_base + ctrl->aon.offset);
> + val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
> + val &= ~(1 << ctrl->aon.iso_shift);
> + writel(val, pll->pwr_base + ctrl->aon.offset);
> +
> + /* certain PLLs also need to be ungated from the ASIU top level */
> + if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> + val = readl(pll->asiu_base + ctrl->asiu.offset);
> + val |= (1 << ctrl->asiu.en_shift);
> + writel(val, pll->asiu_base + ctrl->asiu.offset);
> + }
> +
> + return 0;
> +}
> +
> +static void __pll_put_in_reset(struct iproc_pll *pll)
> +{
> + u32 val;
> + const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> + const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
> +
> + val = readl(pll->pll_base + reset->offset);
> + val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
> + writel(val, pll->pll_base + reset->offset);
> +}
> +
> +static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
> + unsigned int ka, unsigned int ki)
> +{
> + u32 val;
> + const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> + const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
> +
> + val = readl(pll->pll_base + reset->offset);
> + val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
> + bit_mask(reset->kp_width) << reset->kp_shift |
> + bit_mask(reset->ka_width) << reset->ka_shift);
> + val |= ki << reset->ki_shift | kp << reset->kp_shift |
> + ka << reset->ka_shift;
> + val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
> + writel(val, pll->pll_base + reset->offset);
> +}
> +
> +static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
> + unsigned long parent_rate)
> +{
> + const struct iproc_pll_vco_freq_param *vco =
> + &pll->vco_param[rate_index];
> + const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> + int ka = 0, ki, kp, ret;
> + unsigned long rate = vco->rate;
> + u32 val;
> + enum kp_band kp_index;
> + unsigned long ref_freq;
> +
> + /*
> + * reference frequency = parent frequency / PDIV
> + * If PDIV = 0, then it becomes a multiplier (x2)
> + */
> + if (vco->pdiv == 0)
> + ref_freq = parent_rate * 2;
> + else
> + ref_freq = parent_rate / vco->pdiv;
> +
> + /* determine Ki and Kp index based on target VCO frequency */
> + if (rate >= VCO_LOW && rate < VCO_HIGH) {
> + ki = 4;
> + kp_index = KP_BAND_MID;
> + } else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
> + ki = 3;
> + kp_index = KP_BAND_HIGH;
> + } else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
> + ki = 3;
> + kp_index = KP_BAND_HIGH_HIGH;
> + } else {
> + pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
> + pll->name, rate);
> + return -EINVAL;
> + }
> +
> + kp = get_kp(ref_freq, kp_index);
> + if (kp < 0) {
> + pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
> + return kp;
> + }
> +
> + ret = __pll_enable(pll);
> + if (ret) {
> + pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
> + return ret;
> + }
> +
> + /* put PLL in reset */
> + __pll_put_in_reset(pll);
> +
> + writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
> + val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
> +
> + if (rate >= VCO_LOW && rate < VCO_MID)
> + val |= (1 << PLL_VCO_LOW_SHIFT);
> +
> + if (rate < VCO_HIGH)
> + val &= ~(1 << PLL_VCO_HIGH_SHIFT);
> + else
> + val |= (1 << PLL_VCO_HIGH_SHIFT);
> +
> + writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
> +
> + /* program integer part of NDIV */
> + val = readl(pll->pll_base + ctrl->ndiv_int.offset);
> + val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
> + val |= vco->ndiv_int << ctrl->ndiv_int.shift;
> + writel(val, pll->pll_base + ctrl->ndiv_int.offset);
> +
> + /* program fractional part of NDIV */
> + if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
> + val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
> + val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
> + ctrl->ndiv_frac.shift);
> + val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
> + writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
> + }
> +
> + /* program PDIV */
> + val = readl(pll->pll_base + ctrl->pdiv.offset);
> + val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
> + val |= vco->pdiv << ctrl->pdiv.shift;
> + writel(val, pll->pll_base + ctrl->pdiv.offset);
> +
> + __pll_bring_out_reset(pll, kp, ka, ki);
> +
> + ret = pll_wait_for_lock(pll);
> + if (ret < 0) {
> + pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int iproc_pll_enable(struct clk_hw *hw)
> +{
> + struct iproc_pll *pll = to_iproc_pll(hw);
> +
> + return __pll_enable(pll);
> +}
> +
> +static void iproc_pll_disable(struct clk_hw *hw)
> +{
> + struct iproc_pll *pll = to_iproc_pll(hw);
> + const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +
> + if (ctrl->flags & IPROC_CLK_AON)
> + return;
> +
> + __pll_disable(pll);
> +}
> +
> +static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct iproc_pll *pll = to_iproc_pll(hw);
> + const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> + u32 val;
> + u64 ndiv;
> + unsigned int ndiv_int, ndiv_frac, pdiv;
> +
> + if (parent_rate == 0)
> + return 0;
> +
> + /* PLL needs to be locked */
> + val = readl(pll->pll_base + ctrl->status.offset);
> + if ((val & (1 << ctrl->status.shift)) == 0) {
> + pll->rate = 0;
> + return 0;
> + }
> +
> + /*
> + * PLL output frequency =
> + *
> + * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
> + */
> + val = readl(pll->pll_base + ctrl->ndiv_int.offset);
> + ndiv_int = (val >> ctrl->ndiv_int.shift) &
> + bit_mask(ctrl->ndiv_int.width);
> + ndiv = ndiv_int << ctrl->ndiv_int.shift;
> +
> + if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
> + val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
> + ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
> + bit_mask(ctrl->ndiv_frac.width);
> +
> + if (ndiv_frac != 0)
> + ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
> + }
> +
> + val = readl(pll->pll_base + ctrl->pdiv.offset);
> + pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
> +
> + pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
> +
> + if (pdiv == 0)
> + pll->rate *= 2;
> + else
> + pll->rate /= pdiv;
> +
> + return pll->rate;
> +}
> +
> +static const struct clk_ops iproc_pll_ops = {
> + .enable = iproc_pll_enable,
> + .disable = iproc_pll_disable,
> + .recalc_rate = iproc_pll_recalc_rate,
> +};
> +
> +void __init iproc_pll_setup(struct device_node *node,
> + const struct iproc_pll_ctrl *ctrl,
> + const struct iproc_pll_vco_freq_param *vco_param,
> + unsigned int num_vco_entries)
> +{
> + int ret;
> + struct clk *clk;
> + struct iproc_pll *pll;
> + struct clk_init_data init;
> + const char *parent_name;
> + unsigned int rate;
> +
> + if (WARN_ON(!ctrl))
> + return;
> +
> + pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> + if (WARN_ON(!pll))
> + return;
> +
> + pll->pll_base = of_iomap(node, 0);
> + if (WARN_ON(!pll->pll_base))
> + goto err_pll_iomap;
> +
> + pll->pwr_base = of_iomap(node, 1);
> + if (WARN_ON(!pll->pwr_base))
> + goto err_pwr_iomap;
> +
> + /* some PLLs require gating control at the top ASIU level */
> + if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> + pll->asiu_base = of_iomap(node, 2);
> + if (WARN_ON(!pll->asiu_base))
> + goto err_asiu_iomap;
> + }
> +
> + pll->ctrl = ctrl;
> + pll->name = node->name;
> + init.name = node->name;
> + init.ops = &iproc_pll_ops;
> + init.flags = 0;
> + parent_name = of_clk_get_parent_name(node, 0);
> + init.parent_names = (parent_name ? &parent_name : NULL);
> + init.num_parents = (parent_name ? 1 : 0);
> + pll->hw.init = &init;
> +
> + /* configure the PLL to the desired VCO frequency if specified */
> + ret = of_property_read_u32(node, "clock-frequency", &rate);
> + if (!ret) {
> + unsigned long parent_rate;
> + int rate_index;
> +
> + if (WARN_ON(!vco_param))
> + goto err_clk_register;
> +
> + pll->num_vco_entries = num_vco_entries;
> + pll->vco_param = vco_param;
> +
> + parent_rate = __get_rate(parent_name);
> + if (WARN_ON(!parent_rate))
> + goto err_clk_register;
> +
> + rate_index = pll_get_rate_index(pll, rate);
> + if (WARN_ON(rate_index < 0))
> + goto err_clk_register;
> +
> + ret = pll_set_rate(pll, rate_index, parent_rate);
> + if (WARN_ON(ret))
> + goto err_clk_register;
> + }
> +
> + clk = clk_register(NULL, &pll->hw);
> + if (WARN_ON(IS_ERR(clk)))
> + goto err_clk_register;
> +
> + pll->clk_data.clk_num = 1;
> + pll->clk_data.clks = &clk;
> +
> + ret = of_clk_add_provider(node, of_clk_src_onecell_get,
> + &pll->clk_data);
> + if (WARN_ON(ret))
> + goto err_clk_add;
> +
> + return;
> +
> +err_clk_add:
> + clk_unregister(clk);
> +err_clk_register:
> + if (pll->asiu_base)
> + iounmap(pll->asiu_base);
> +err_asiu_iomap:
> + iounmap(pll->pwr_base);
> +err_pwr_iomap:
> + iounmap(pll->pll_base);
> +err_pll_iomap:
> + kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
> new file mode 100644
> index 0000000..4aa0479
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc.h
> @@ -0,0 +1,155 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * 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.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _CLK_IPROC_H
> +#define _CLK_IPROC_H
> +
> +#include <linux/kernel.h>
> +#include <linux/list.h>
> +#include <linux/spinlock.h>
> +#include <linux/slab.h>
> +#include <linux/device.h>
> +#include <linux/of.h>
> +#include <linux/clk-provider.h>
> +
> +#define IPROC_CLK_NAME_LEN 25
> +#define IPROC_CLK_INVALID_OFFSET 0xffffffff
> +#define bit_mask(width) ((1 << (width)) - 1)
> +
> +/* clock should not be disabled at runtime */
> +#define IPROC_CLK_AON BIT(0)
> +
> +/* PLL requires gating through ASIU */
> +#define IPROC_CLK_PLL_ASIU BIT(1)
> +
> +/* PLL has fractional part of the NDIV */
> +#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
> +
> +/*
> + * Parameters for VCO frequency configuration
> + *
> + * VCO frequency =
> + * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy / pdiv)
> + */
> +struct iproc_pll_vco_freq_param {
> + unsigned long rate;
> + unsigned int ndiv_int;
> + unsigned int ndiv_frac;
> + unsigned int pdiv;
> +};
> +
> +struct iproc_clk_reg_op {
> + unsigned int offset;
> + unsigned int shift;
> + unsigned int width;
> +};
> +
> +/*
> + * Clock gating control at the top ASIU level
> + */
> +struct iproc_asiu_gate {
> + unsigned int offset;
> + unsigned int en_shift;
> +};
> +
> +/*
> + * Control of powering on/off of a PLL
> + *
> + * Before powering off a PLL, input isolation (ISO) needs to be enabled
> + */
> +struct iproc_pll_aon_pwr_ctrl {
> + unsigned int offset;
> + unsigned int pwr_width;
> + unsigned int pwr_shift;
> + unsigned int iso_shift;
> +};
> +
> +/*
> + * Control of the PLL reset, with Ki, Kp, and Ka parameters
> + */
> +struct iproc_pll_reset_ctrl {
> + unsigned int offset;
> + unsigned int reset_shift;
> + unsigned int p_reset_shift;
> + unsigned int ki_shift;
> + unsigned int ki_width;
> + unsigned int kp_shift;
> + unsigned int kp_width;
> + unsigned int ka_shift;
> + unsigned int ka_width;
> +};
> +
> +struct iproc_pll_vco_ctrl {
> + unsigned int u_offset;
> + unsigned int l_offset;
> +};
> +
> +/*
> + * Main PLL control parameters
> + */
> +struct iproc_pll_ctrl {
> + unsigned long flags;
> + struct iproc_pll_aon_pwr_ctrl aon;
> + struct iproc_asiu_gate asiu;
> + struct iproc_pll_reset_ctrl reset;
> + struct iproc_clk_reg_op ndiv_int;
> + struct iproc_clk_reg_op ndiv_frac;
> + struct iproc_clk_reg_op pdiv;
> + struct iproc_pll_vco_ctrl vco_ctrl;
> + struct iproc_clk_reg_op status;
> +};
> +
> +/*
> + * Controls enabling/disabling a PLL derived clock
> + */
> +struct iproc_clk_enable_ctrl {
> + unsigned int offset;
> + unsigned int enable_shift;
> + unsigned int hold_shift;
> + unsigned int bypass_shift;
> +};
> +
> +/*
> + * Main clock control parameters for clocks derived from the PLLs
> + */
> +struct iproc_clk_ctrl {
> + unsigned int channel;
> + unsigned long flags;
> + struct iproc_clk_enable_ctrl enable;
> + struct iproc_clk_reg_op mdiv;
> +};
> +
> +/*
> + * Divisor of the ASIU clocks
> + */
> +struct iproc_asiu_div {
> + unsigned int offset;
> + unsigned int en_shift;
> + unsigned int high_shift;
> + unsigned int high_width;
> + unsigned int low_shift;
> + unsigned int low_width;
> +};
> +
> +extern void __init iproc_armpll_setup(struct device_node *node);
> +extern void __init iproc_pll_setup(struct device_node *node,
> + const struct iproc_pll_ctrl *ctrl,
> + const struct iproc_pll_vco_freq_param *vco_param,
> + unsigned int num_freqs);
> +extern void __init iproc_clk_setup(struct device_node *node,
> + const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
> +extern void __init iproc_asiu_setup(struct device_node *node,
> + const struct iproc_asiu_div *div,
> + const struct iproc_asiu_gate *gate, unsigned int num_clks);
> +
> +#endif /* _CLK_IPROC_H */
> --
> 1.7.9.5
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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