Re: [PATCH 2/4] clk: iproc: add initial common clock support

Ray Jui
2014-12-08T01:38:18Z

On 12/6/2014 2:20 PM, Tim Kryger wrote:
> On Thu, Dec 4, 2014 at 1:43 PM, Ray Jui <rjui@broadcom.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@broadcom.com>
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.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.
>
Okay. Will make this change along with other changes if required. Still
waiting for more code review comments at this point.

>> 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@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel