Message-ID: <52600950.4090601@atmel.com>
Date: Thu, 17 Oct 2013 17:59:12 +0200
From: Nicolas Ferre <nicolas.ferre@atmel.com>
Organization: atmel
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To: Boris BREZILLON <b.brezillon@overkiz.com>,
        Rob Herring <rob.herring@calxeda.com>, Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Stephen Warren <swarren@wwwdotorg.org>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Rob Landley <rob@landley.net>, Andrew Victor <linux@maxim.org.za>,
        Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
        Russell King <linux@arm.linux.org.uk>,
        "Mike Turquette" <mturquette@linaro.org>, Felipe Balbi <balbi@ti.com>,
        "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
        Grant Likely <grant.likely@linaro.org>,
        Ludovic Desroches <ludovic.desroches@atmel.com>,
        Josh Wu <josh.wu@atmel.com>, Richard Genoud <richard.genoud@gmail.com>
CC: <devicetree@vger.kernel.org>, <linux-doc@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>,
        <linux-usb@vger.kernel.org>
Subject: Re: [PATCH v4 06/17] clk: at91: add PMC pll clocks
References: <1381477081-6041-1-git-send-email-b.brezillon@overkiz.com> <1381481306-12181-1-git-send-email-b.brezillon@overkiz.com>
In-Reply-To: <1381481306-12181-1-git-send-email-b.brezillon@overkiz.com>
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On 11/10/2013 10:48, Boris BREZILLON :
> This patch adds new at91 pll clock implementation using common clk framework.
>
> The pll clock layout describe the PLLX register layout.
> There are four pll clock layouts:
> - at91rm9200
> - at91sam9g20
> - at91sam9g45
> - sama5d3
>
> PLL clocks are given characteristics:
> - min/max clock source rate
> - ranges of valid clock output rates
> - values to set in out and icpll fields for each supported output range
>
> These characteristics are checked during rate change to avoid
> over/underclocking.
>
> These characteristics are described in atmel's SoC datasheet in
> "Electrical Characteristics" paragraph.
>
> Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>

Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>

> ---
>   drivers/clk/at91/Makefile     |    2 +-
>   drivers/clk/at91/clk-pll.c    |  545 +++++++++++++++++++++++++++++++++++++++++
>   drivers/clk/at91/clk-plldiv.c |  137 +++++++++++
>   drivers/clk/at91/pmc.c        |   21 ++
>   drivers/clk/at91/pmc.h        |   11 +
>   include/linux/clk/at91_pmc.h  |    2 +
>   6 files changed, 717 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/clk/at91/clk-pll.c
>   create mode 100644 drivers/clk/at91/clk-plldiv.c
>
> diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
> index 44105bd..902bbf1 100644
> --- a/drivers/clk/at91/Makefile
> +++ b/drivers/clk/at91/Makefile
> @@ -3,4 +3,4 @@
>   #
>
>   obj-y += pmc.o
> -obj-y += clk-main.o
> +obj-y += clk-main.o clk-pll.o clk-plldiv.o
> diff --git a/drivers/clk/at91/clk-pll.c b/drivers/clk/at91/clk-pll.c
> new file mode 100644
> index 0000000..44caddf
> --- /dev/null
> +++ b/drivers/clk/at91/clk-pll.c
> @@ -0,0 +1,545 @@
> +/*
> + * drivers/clk/at91/clk-pll.c
> + *
> + *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
> + *
> + * 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; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + */
> +
> +#include <linux/clk-provider.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk/at91_pmc.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/io.h>
> +#include <linux/wait.h>
> +#include <linux/sched.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +
> +#include "pmc.h"
> +
> +#define PLL_STATUS_MASK(id)	(1 << (1 + (id)))
> +#define PLL_REG(id)		(AT91_CKGR_PLLAR + ((id) * 4))
> +#define PLL_DIV_MASK		0xff
> +#define PLL_DIV_MAX		PLL_DIV_MASK
> +#define PLL_DIV(reg)		((reg) & PLL_DIV_MASK)
> +#define PLL_MUL(reg, layout)	(((reg) >> (layout)->mul_shift) & \
> +				 (layout)->mul_mask)
> +#define PLL_ICPR_SHIFT(id)	((id) * 16)
> +#define PLL_ICPR_MASK(id)	(0xffff << PLL_ICPR_SHIFT(id))
> +#define PLL_MAX_COUNT		0x3ff
> +#define PLL_COUNT_SHIFT		8
> +#define PLL_OUT_SHIFT		14
> +#define PLL_MAX_ID		1
> +
> +struct clk_pll_characteristics {
> +	struct clk_range input;
> +	int num_output;
> +	struct clk_range *output;
> +	u16 *icpll;
> +	u8 *out;
> +};
> +
> +struct clk_pll_layout {
> +	u32 pllr_mask;
> +	u16 mul_mask;
> +	u8 mul_shift;
> +};
> +
> +#define to_clk_pll(hw) container_of(hw, struct clk_pll, hw)
> +
> +struct clk_pll {
> +	struct clk_hw hw;
> +	struct at91_pmc *pmc;
> +	unsigned int irq;
> +	wait_queue_head_t wait;
> +	u8 id;
> +	u8 div;
> +	u8 range;
> +	u16 mul;
> +	const struct clk_pll_layout *layout;
> +	const struct clk_pll_characteristics *characteristics;
> +};
> +
> +static irqreturn_t clk_pll_irq_handler(int irq, void *dev_id)
> +{
> +	struct clk_pll *pll = (struct clk_pll *)dev_id;
> +
> +	wake_up(&pll->wait);
> +	disable_irq_nosync(pll->irq);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int clk_pll_prepare(struct clk_hw *hw)
> +{
> +	struct clk_pll *pll = to_clk_pll(hw);
> +	struct at91_pmc *pmc = pll->pmc;
> +	const struct clk_pll_layout *layout = pll->layout;
> +	u8 id = pll->id;
> +	u32 mask = PLL_STATUS_MASK(id);
> +	int offset = PLL_REG(id);
> +	u8 out = 0;
> +	u32 pllr, icpr;
> +	u8 div;
> +	u16 mul;
> +
> +	pllr = pmc_read(pmc, offset);
> +	div = PLL_DIV(pllr);
> +	mul = PLL_MUL(pllr, layout);
> +
> +	if ((pmc_read(pmc, AT91_PMC_SR) & mask) &&
> +	    (div == pll->div && mul == pll->mul))
> +		return 0;
> +
> +	if (characteristics->out)
> +		out = characteristics->out[pll->range];
> +	if (characteristics->icpll) {
> +		icpr = pmc_read(pmc, AT91_PMC_PLLICPR) & ~PLL_ICPR_MASK(id);
> +		icpr |= (characteristics->icpll[pll->range] <<
> +			PLL_ICPR_SHIFT(id));
> +		pmc_write(pmc, AT91_PMC_PLLICPR, icpr);
> +	}
> +
> +	pllr &= ~layout->pllr_mask;
> +	pllr |= layout->pllr_mask &
> +	       (pll->div | (PLL_MAX_COUNT << PLL_COUNT_SHIFT) |
> +		(out << PLL_OUT_SHIFT) |
> +		((pll->mul & layout->mul_mask) << layout->mul_shift));
> +	pmc_write(pmc, offset, pllr);
> +
> +	while (!(pmc_read(pmc, AT91_PMC_SR) & mask)) {
> +		enable_irq(pll->irq);
> +		wait_event(pll->wait,
> +			   pmc_read(pmc, AT91_PMC_SR) & mask);
> +	}
> +
> +	return 0;
> +}
> +
> +static int clk_pll_is_ready(struct clk_hw *hw)
> +{
> +	struct clk_pll *pll = to_clk_pll(hw);
> +	struct at91_pmc *pmc = pll->pmc;
> +
> +	return !!(pmc_read(pmc, AT91_PMC_SR) &
> +		  PLL_STATUS_MASK(pll->id));
> +}
> +
> +static void clk_pll_disable(struct clk_hw *hw)
> +{
> +	struct clk_pll *pll = to_clk_pll(hw);
> +	struct at91_pmc *pmc = pll->pmc;
> +	const struct clk_pll_layout *layout = pll->layout;
> +	int offset = PLL_REG(pll->id);
> +	u32 tmp = pmc_read(pmc, offset) & ~(layout->pllr_mask);
> +
> +	pmc_write(pmc, offset, tmp);
> +}
> +
> +static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
> +					 unsigned long parent_rate)
> +{
> +	struct clk_pll *pll = to_clk_pll(hw);
> +	const struct clk_pll_layout *layout = pll->layout;
> +	struct at91_pmc *pmc = pll->pmc;
> +	int offset = PLL_REG(pll->id);
> +	u32 tmp = pmc_read(pmc, offset) & layout->pllr_mask;
> +	u8 div = PLL_DIV(tmp);
> +	u16 mul = PLL_MUL(tmp, layout);
> +	if (!div || !mul)
> +		return 0;
> +
> +	return (parent_rate * (mul + 1)) / div;
> +}
> +
> +static long clk_pll_get_best_div_mul(struct clk_pll *pll, unsigned long rate,
> +				     unsigned long parent_rate,
> +				     u32 *div, u32 *mul,
> +				     u32 *index) {
> +	unsigned long maxrate;
> +	unsigned long minrate;
> +	unsigned long divrate;
> +	unsigned long bestdiv = 1;
> +	unsigned long bestmul;
> +	unsigned long tmpdiv;
> +	unsigned long roundup;
> +	unsigned long rounddown;
> +	unsigned long remainder;
> +	unsigned long bestremainder;
> +	unsigned long maxmul;
> +	unsigned long maxdiv;
> +	unsigned long mindiv;
> +	int i = 0;
> +	const struct clk_pll_layout *layout = pll->layout;
> +	const struct clk_pll_characteristics *characteristics =
> +							pll->characteristics;
> +
> +	/* Minimum divider = 1 */
> +	/* Maximum multiplier = max_mul */
> +	maxmul = layout->mul_mask + 1;
> +	maxrate = (parent_rate * maxmul) / 1;
> +
> +	/* Maximum divider = max_div */
> +	/* Minimum multiplier = 2 */
> +	maxdiv = PLL_DIV_MAX;
> +	minrate = (parent_rate * 2) / maxdiv;
> +
> +	if (parent_rate < characteristics->input.min ||
> +	    parent_rate < characteristics->input.max)
> +		return -ERANGE;
> +
> +	if (parent_rate < minrate || parent_rate > maxrate)
> +		return -ERANGE;
> +
> +	for (i = 0; i < characteristics->num_output; i++) {
> +		if (parent_rate >= characteristics->output[i].min &&
> +		    parent_rate <= characteristics->output[i].max)
> +			break;
> +	}
> +
> +	if (i >= characteristics->num_output)
> +		return -ERANGE;
> +
> +	bestmul = rate / parent_rate;
> +	rounddown = parent_rate % rate;
> +	roundup = rate - rounddown;
> +	bestremainder = roundup < rounddown ? roundup : rounddown;
> +
> +	if (!bestremainder) {
> +		if (div)
> +			*div = bestdiv;
> +		if (mul)
> +			*mul = bestmul;
> +		if (index)
> +			*index = i;
> +		return rate;
> +	}
> +
> +	maxdiv = 255 / (bestmul + 1);
> +	if (parent_rate / maxdiv < characteristics->input.min)
> +		maxdiv = parent_rate / characteristics->input.min;
> +	mindiv = parent_rate / characteristics->input.max;
> +	if (parent_rate % characteristics->input.max)
> +		mindiv++;
> +
> +	for (tmpdiv = mindiv; tmpdiv < maxdiv; tmpdiv++) {
> +		divrate = parent_rate / tmpdiv;
> +
> +		rounddown = rate % divrate;
> +		roundup = divrate - rounddown;
> +		remainder = roundup < rounddown ? roundup : rounddown;
> +
> +		if (remainder < bestremainder) {
> +			bestremainder = remainder;
> +			bestmul = rate / divrate;
> +			bestdiv = tmpdiv;
> +		}
> +
> +		if (!remainder)
> +			break;
> +	}
> +
> +	rate = (parent_rate / bestdiv) * bestmul;
> +
> +	if (div)
> +		*div = bestdiv;
> +	if (mul)
> +		*mul = bestmul;
> +	if (index)
> +		*index = i;
> +
> +	return rate;
> +}
> +
> +static long clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> +					unsigned long *parent_rate)
> +{
> +	struct clk_pll *pll = to_clk_pll(hw);
> +
> +	return clk_pll_get_best_div_mul(pll, rate, *parent_rate,
> +					NULL, NULL, NULL);
> +}
> +
> +static int clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
> +			    unsigned long parent_rate)
> +{
> +	struct clk_pll *pll = to_clk_pll(hw);
> +	struct at91_pmc *pmc = pll->pmc;
> +	const struct clk_pll_layout *layout = pll->layout;
> +	const struct clk_pll_characteristics *characteristics =
> +						pll->characteristics;
> +	u8 id = pll->id;
> +	int offset = PLL_REG(id);
> +	long ret;
> +	u32 div;
> +	u32 mul;
> +	u32 index;
> +	u32 tmp;
> +	u8 out = 0;
> +
> +	ret = clk_pll_get_best_div_mul(pll, rate, parent_rate,
> +				       &div, &mul, &index);
> +	if (ret < 0)
> +		return ret;
> +
> +	pll->range = index;
> +	pll->div = div;
> +	pll->mul = mul;
> +
> +	return 0;
> +}
> +
> +static const struct clk_ops pll_ops = {
> +	.prepare = clk_pll_prepare,
> +	.is_prepared = clk_pll_is_ready,
> +	.disable = clk_pll_disable,
> +	.is_enabled = clk_pll_is_ready,
> +	.recalc_rate = clk_pll_recalc_rate,
> +	.round_rate = clk_pll_round_rate,
> +	.set_rate = clk_pll_set_rate,
> +};
> +
> +static struct clk * __init
> +at91_clk_register_pll(struct at91_pmc *pmc, unsigned int irq, const char *name,
> +		      const char *parent_name, u8 id,
> +		      const struct clk_pll_layout *layout,
> +		      const struct clk_pll_characteristics *characteristics)
> +{
> +	struct clk_pll *pll;
> +	struct clk *clk = NULL;
> +	struct clk_init_data init;
> +	int ret;
> +	int offset = PLL_REG(id);
> +	u32 tmp;
> +
> +	if (id > PLL_MAX_ID)
> +		return ERR_PTR(-EINVAL);
> +
> +	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +	if (!pll)
> +		return ERR_PTR(-ENOMEM);
> +
> +	init.name = name;
> +	init.ops = &pll_ops;
> +	init.parent_names = &parent_name;
> +	init.num_parents = 1;
> +	init.flags = CLK_SET_RATE_GATE;
> +
> +	pll->id = id;
> +	pll->hw.init = &init;
> +	pll->layout = layout;
> +	pll->characteristics = characteristics;
> +	pll->pmc = pmc;
> +	pll->irq = irq;
> +	tmp = pmc_read(pmc, offset) & layout->pllr_mask;
> +	pll->div = PLL_DIV(tmp);
> +	pll->mul = PLL_MUL(tmp, layout);
> +	init_waitqueue_head(&pll->wait);
> +	irq_set_status_flags(pll->irq, IRQ_NOAUTOEN);
> +	ret = request_irq(pll->irq, clk_pll_irq_handler, IRQF_TRIGGER_HIGH,
> +			  id ? "clk-pllb" : "clk-plla", pll);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	clk = clk_register(NULL, &pll->hw);
> +	if (IS_ERR(clk))
> +		kfree(pll);
> +
> +	return clk;
> +}
> +
> +
> +static const struct clk_pll_layout at91rm9200_pll_layout = {
> +	.pllr_mask = 0x7FFFFFF,
> +	.mul_shift = 16,
> +	.mul_mask = 0x7FF,
> +};
> +
> +static const struct clk_pll_layout at91sam9g45_pll_layout = {
> +	.pllr_mask = 0xFFFFFF,
> +	.mul_shift = 16,
> +	.mul_mask = 0xFF,
> +};
> +
> +static const struct clk_pll_layout at91sam9g20_pllb_layout = {
> +	.pllr_mask = 0x3FFFFF,
> +	.mul_shift = 16,
> +	.mul_mask = 0x3F,
> +};
> +
> +static const struct clk_pll_layout sama5d3_pll_layout = {
> +	.pllr_mask = 0x1FFFFFF,
> +	.mul_shift = 18,
> +	.mul_mask = 0x7F,
> +};
> +
> +
> +static struct clk_pll_characteristics * __init
> +of_at91_clk_pll_get_characteristics(struct device_node *np)
> +{
> +	int i;
> +	int offset;
> +	u32 tmp;
> +	int num_output;
> +	u32 num_cells;
> +	struct clk_range input;
> +	struct clk_range *output;
> +	u8 *out = NULL;
> +	u16 *icpll = NULL;
> +	struct clk_pll_characteristics *characteristics;
> +
> +	if (of_property_read_u32_index(np, "atmel,clk-input-range", 0, &tmp))
> +		return NULL;
> +	input.min = tmp;
> +
> +	if (of_property_read_u32_index(np, "atmel,clk-input-range", 1, &tmp))
> +		return NULL;
> +	input.max = tmp;
> +
> +	if (of_property_read_u32(np, "#atmel,pll-clk-output-range-cells",
> +				 &num_cells))
> +		return NULL;
> +
> +	if (num_cells < 2 || num_cells > 4)
> +		return NULL;
> +
> +	if (!of_get_property(np, "atmel,pll-clk-output-ranges", &tmp))
> +		return NULL;
> +	num_output = tmp / (sizeof(u32) * num_cells);
> +
> +	characteristics = kzalloc(sizeof(*characteristics), GFP_KERNEL);
> +	if (!characteristics)
> +		return NULL;
> +
> +	output = kzalloc(sizeof(*output) * num_output, GFP_KERNEL);
> +	if (!output)
> +		goto out_free_characteristics;
> +
> +	if (num_cells > 2) {
> +		out = kzalloc(sizeof(*out) * num_output, GFP_KERNEL);
> +		if (!out)
> +			goto out_free_output;
> +	}
> +
> +	if (num_cells > 3) {
> +		icpll = kzalloc(sizeof(*icpll) * num_output, GFP_KERNEL);
> +		if (!icpll)
> +			goto out_free_output;
> +	}
> +
> +	for (i = 0; i < num_output; i++) {
> +		offset = i * num_cells;
> +		if (of_property_read_u32_index(np,
> +					       "atmel,pll-clk-output-ranges",
> +					       offset, &tmp))
> +			goto out_free_output;
> +		output[i].min = tmp;
> +		if (of_property_read_u32_index(np,
> +					       "atmel,pll-clk-output-ranges",
> +					       offset + 1, &tmp))
> +			goto out_free_output;
> +		output[i].max = tmp;
> +
> +		if (num_cells == 2)
> +			continue;
> +
> +		if (of_property_read_u32_index(np,
> +					       "atmel,pll-clk-output-ranges",
> +					       offset + 2, &tmp))
> +			goto out_free_output;
> +		out[i] = tmp;
> +
> +		if (num_cells == 3)
> +			continue;
> +
> +		if (of_property_read_u32_index(np,
> +					       "atmel,pll-clk-output-ranges",
> +					       offset + 3, &tmp))
> +			goto out_free_output;
> +		icpll[i] = tmp;
> +	}
> +
> +	characteristics->input = input;
> +	characteristics->num_output = num_output;
> +	characteristics->output = output;
> +	characteristics->out = out;
> +	characteristics->icpll = icpll;
> +	return characteristics;
> +
> +out_free_output:
> +	kfree(icpll);
> +	kfree(out);
> +	kfree(output);
> +out_free_characteristics:
> +	kfree(characteristics);
> +	return NULL;
> +}
> +
> +static void __init
> +of_at91_clk_pll_setup(struct device_node *np, struct at91_pmc *pmc,
> +		      const struct clk_pll_layout *layout)
> +{
> +	u32 id;
> +	unsigned int irq;
> +	struct clk *clk;
> +	const char *parent_name;
> +	const char *name = np->name;
> +	struct clk_pll_characteristics *characteristics;
> +
> +	if (of_property_read_u32(np, "atmel,clk-id", &id))
> +		return;
> +
> +	parent_name = of_clk_get_parent_name(np, 0);
> +
> +	of_property_read_string(np, "clock-output-names", &name);
> +
> +	characteristics = of_at91_clk_pll_get_characteristics(np);
> +	if (!characteristics)
> +		return;
> +
> +	irq = irq_of_parse_and_map(np, 0);
> +	if (!irq)
> +		return;
> +
> +	clk = at91_clk_register_pll(pmc, irq, name, parent_name, id, layout,
> +				    characteristics);
> +	if (IS_ERR(clk))
> +		goto out_free_characteristics;
> +
> +	of_clk_add_provider(np, of_clk_src_simple_get, clk);
> +	return;
> +
> +out_free_characteristics:
> +	kfree(characteristics);
> +}
> +
> +void __init of_at91rm9200_clk_pll_setup(struct device_node *np,
> +					       struct at91_pmc *pmc)
> +{
> +	of_at91_clk_pll_setup(np, pmc, &at91rm9200_pll_layout);
> +}
> +
> +void __init of_at91sam9g45_clk_pll_setup(struct device_node *np,
> +						struct at91_pmc *pmc)
> +{
> +	of_at91_clk_pll_setup(np, pmc, &at91sam9g45_pll_layout);
> +}
> +
> +void __init of_at91sam9g20_clk_pllb_setup(struct device_node *np,
> +						 struct at91_pmc *pmc)
> +{
> +	of_at91_clk_pll_setup(np, pmc, &at91sam9g20_pllb_layout);
> +}
> +
> +void __init of_sama5d3_clk_pll_setup(struct device_node *np,
> +					    struct at91_pmc *pmc)
> +{
> +	of_at91_clk_pll_setup(np, pmc, &sama5d3_pll_layout);
> +}
> diff --git a/drivers/clk/at91/clk-plldiv.c b/drivers/clk/at91/clk-plldiv.c
> new file mode 100644
> index 0000000..2bbb22b
> --- /dev/null
> +++ b/drivers/clk/at91/clk-plldiv.c
> @@ -0,0 +1,137 @@
> +/*
> + * drivers/clk/at91/clk-plldiv.c
> + *
> + *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
> + *
> + * 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; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + */
> +
> +#include <linux/clk-provider.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk/at91_pmc.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/io.h>
> +
> +#include "pmc.h"
> +
> +#define to_clk_plldiv(hw) container_of(hw, struct clk_plldiv, hw)
> +
> +struct clk_plldiv {
> +	struct clk_hw hw;
> +	struct at91_pmc *pmc;
> +};
> +
> +static unsigned long clk_plldiv_recalc_rate(struct clk_hw *hw,
> +					    unsigned long parent_rate)
> +{
> +	struct clk_plldiv *plldiv = to_clk_plldiv(hw);
> +	struct at91_pmc *pmc = plldiv->pmc;
> +
> +	if (pmc_read(pmc, AT91_PMC_MCKR) & AT91_PMC_PLLADIV2)
> +		return parent_rate / 2;
> +
> +	return parent_rate;
> +}
> +
> +static long clk_plldiv_round_rate(struct clk_hw *hw, unsigned long rate,
> +					unsigned long *parent_rate)
> +{
> +	unsigned long div;
> +
> +	if (rate > *parent_rate)
> +		return *parent_rate;
> +	div = *parent_rate / 2;
> +	if (rate < div)
> +		return div;
> +
> +	if (rate - div < *parent_rate - rate)
> +		return div;
> +
> +	return *parent_rate;
> +}
> +
> +static int clk_plldiv_set_rate(struct clk_hw *hw, unsigned long rate,
> +			       unsigned long parent_rate)
> +{
> +	struct clk_plldiv *plldiv = to_clk_plldiv(hw);
> +	struct at91_pmc *pmc = plldiv->pmc;
> +	u32 tmp;
> +
> +	if (parent_rate != rate && (parent_rate / 2) != rate)
> +		return -EINVAL;
> +
> +	pmc_lock(pmc);
> +	tmp = pmc_read(pmc, AT91_PMC_MCKR) & ~AT91_PMC_PLLADIV2;
> +	if ((parent_rate / 2) == rate)
> +		tmp |= AT91_PMC_PLLADIV2;
> +	pmc_write(pmc, AT91_PMC_MCKR, tmp);
> +	pmc_unlock(pmc);
> +
> +	return 0;
> +}
> +
> +static const struct clk_ops plldiv_ops = {
> +	.recalc_rate = clk_plldiv_recalc_rate,
> +	.round_rate = clk_plldiv_round_rate,
> +	.set_rate = clk_plldiv_set_rate,
> +};
> +
> +static struct clk * __init
> +at91_clk_register_plldiv(struct at91_pmc *pmc, const char *name,
> +			 const char *parent_name)
> +{
> +	struct clk_plldiv *plldiv;
> +	struct clk *clk = NULL;
> +	struct clk_init_data init;
> +
> +	plldiv = kzalloc(sizeof(*plldiv), GFP_KERNEL);
> +	if (!plldiv)
> +		return ERR_PTR(-ENOMEM);
> +
> +	init.name = name;
> +	init.ops = &plldiv_ops;
> +	init.parent_names = parent_name ? &parent_name : NULL;
> +	init.num_parents = parent_name ? 1 : 0;
> +	init.flags = CLK_SET_RATE_GATE;
> +
> +	plldiv->hw.init = &init;
> +	plldiv->pmc = pmc;
> +
> +	clk = clk_register(NULL, &plldiv->hw);
> +
> +	if (IS_ERR(clk))
> +		kfree(plldiv);
> +
> +	return clk;
> +}
> +
> +static void __init
> +of_at91_clk_plldiv_setup(struct device_node *np, struct at91_pmc *pmc)
> +{
> +	struct clk *clk;
> +	const char *parent_name;
> +	const char *name = np->name;
> +
> +	parent_name = of_clk_get_parent_name(np, 0);
> +
> +	of_property_read_string(np, "clock-output-names", &name);
> +
> +	clk = at91_clk_register_plldiv(pmc, name, parent_name);
> +
> +	if (IS_ERR(clk))
> +		return;
> +
> +	of_clk_add_provider(np, of_clk_src_simple_get, clk);
> +	return;
> +}
> +
> +void __init of_at91sam9x5_clk_plldiv_setup(struct device_node *np,
> +					   struct at91_pmc *pmc)
> +{
> +	of_at91_clk_plldiv_setup(np, pmc);
> +}
> diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
> index ccfe506..c882e97 100644
> --- a/drivers/clk/at91/pmc.c
> +++ b/drivers/clk/at91/pmc.c
> @@ -213,6 +213,27 @@ static const struct of_device_id pmc_clk_ids[] __initdata = {
>   		.compatible = "atmel,at91rm9200-clk-main",
>   		.data = of_at91rm9200_clk_main_setup
>   	},
> +	/* PLL clocks */
> +	{
> +		.compatible = "atmel,at91rm9200-clk-pll",
> +		.data = of_at91rm9200_clk_pll_setup,
> +	},
> +	{
> +		.compatible = "atmel,at91sam9g45-clk-pll",
> +		.data = of_at91sam9g45_clk_pll_setup,
> +	},
> +	{
> +		.compatible = "atmel,at91sam9g20-clk-pllb",
> +		.data = of_at91sam9g20_clk_pllb_setup,
> +	},
> +	{
> +		.compatible = "atmel,sama5d3-clk-pll",
> +		.data = of_sama5d3_clk_pll_setup,
> +	},
> +	{
> +		.compatible = "atmel,at91sam9x5-clk-plldiv",
> +		.data = of_at91sam9x5_clk_plldiv_setup,
> +	},
>   	{ /*sentinel*/ }
>   };
>
> diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
> index 294e230..35ccbbc 100644
> --- a/drivers/clk/at91/pmc.h
> +++ b/drivers/clk/at91/pmc.h
> @@ -58,4 +58,15 @@ static inline void pmc_write(struct at91_pmc *pmc, int offset, u32 value)
>   extern void __init of_at91rm9200_clk_main_setup(struct device_node *np,
>   						struct at91_pmc *pmc);
>
> +extern void __init of_at91rm9200_clk_pll_setup(struct device_node *np,
> +					       struct at91_pmc *pmc);
> +extern void __init of_at91sam9g45_clk_pll_setup(struct device_node *np,
> +						struct at91_pmc *pmc);
> +extern void __init of_at91sam9g20_clk_pllb_setup(struct device_node *np,
> +						 struct at91_pmc *pmc);
> +extern void __init of_sama5d3_clk_pll_setup(struct device_node *np,
> +					    struct at91_pmc *pmc);
> +extern void __init of_at91sam9x5_clk_plldiv_setup(struct device_node *np,
> +						  struct at91_pmc *pmc);
> +
>   #endif /* __PMC_H_ */
> diff --git a/include/linux/clk/at91_pmc.h b/include/linux/clk/at91_pmc.h
> index 00c45b3..a6911eb 100644
> --- a/include/linux/clk/at91_pmc.h
> +++ b/include/linux/clk/at91_pmc.h
> @@ -164,6 +164,8 @@ extern void __iomem *at91_pmc_base;
>   #define		AT91_PMC_CFDEV		(1 << 18)		/* Clock Failure Detector Event [some SAM9] */
>   #define	AT91_PMC_IMR		0x6c			/* Interrupt Mask Register */
>
> +#define AT91_PMC_PLLICPR	0x80			/* PLL Charge Pump Current Register */
> +
>   #define AT91_PMC_PROT		0xe4			/* Write Protect Mode Register [some SAM9] */
>   #define		AT91_PMC_WPEN		(0x1  <<  0)		/* Write Protect Enable */
>   #define		AT91_PMC_WPKEY		(0xffffff << 8)		/* Write Protect Key */
>


-- 
Nicolas Ferre
--
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