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Message-ID: <525430BA.8070701@atmel.com>
Date: Tue, 8 Oct 2013 18:20:10 +0200
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: Boris BREZILLON <b.brezillon@...rkiz.com>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <rob.herring@...xeda.com>,
Rob Landley <rob@...dley.net>,
Andrew Victor <linux@...im.org.za>,
"Jean-Christophe Plagniol-Villard" <plagnioj@...osoft.com>,
Russell King <linux@....linux.org.uk>,
Mike Turquette <mturquette@...aro.org>,
"Felipe Balbi" <balbi@...com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Ludovic Desroches <ludovic.desroches@...el.com>,
Josh Wu <josh.wu@...el.com>,
Richard Genoud <richard.genoud@...il.com>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 15/19] clk: at91: add PMC usb clock
On 08/08/2013 09:15, Boris BREZILLON :
> This patch adds new at91 usb clock implementation using common clk framework.
> This clock is used to clock usb ports (ohci, ehci and udc).
Blank line == "Ditto" ;-)
>
> Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>
> ---
> arch/arm/mach-at91/Kconfig | 11 ++
> drivers/clk/at91/Makefile | 1 +
> drivers/clk/at91/clk-usb.c | 323 ++++++++++++++++++++++++++++++++++++++++++++
> drivers/clk/at91/pmc.c | 11 ++
> drivers/clk/at91/pmc.h | 7 +
> 5 files changed, 353 insertions(+)
> create mode 100644 drivers/clk/at91/clk-usb.c
>
> diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
> index 6ad37da..b76dc4c 100644
> --- a/arch/arm/mach-at91/Kconfig
> +++ b/arch/arm/mach-at91/Kconfig
> @@ -3,6 +3,9 @@ if ARCH_AT91
> config HAVE_AT91_UTMI
> bool
>
> +config HAVE_AT91_USB_CLK
> + bool
> +
> config HAVE_AT91_DBGU0
> bool
>
> @@ -82,6 +85,7 @@ config SOC_SAMA5D3
> select HAVE_AT91_DBGU1
> select AT91_USE_OLD_CLK
> select HAVE_AT91_UTMI
> + select HAVE_AT91_USB_CLK
> help
> Select this if you are using one of Atmel's SAMA5D3 family SoC.
> This support covers SAMA5D31, SAMA5D33, SAMA5D34, SAMA5D35.
> @@ -96,12 +100,14 @@ config SOC_AT91RM9200
> select MULTI_IRQ_HANDLER
> select SPARSE_IRQ
> select AT91_USE_OLD_CLK
> + select HAVE_AT91_USB_CLK
>
> config SOC_AT91SAM9260
> bool "AT91SAM9260, AT91SAM9XE or AT91SAM9G20"
> select HAVE_AT91_DBGU0
> select SOC_AT91SAM9
> select AT91_USE_OLD_CLK
> + select HAVE_AT91_USB_CLK
> help
> Select this if you are using one of Atmel's AT91SAM9260, AT91SAM9XE
> or AT91SAM9G20 SoC.
> @@ -112,6 +118,7 @@ config SOC_AT91SAM9261
> select HAVE_FB_ATMEL
> select SOC_AT91SAM9
> select AT91_USE_OLD_CLK
> + select HAVE_AT91_USB_CLK
> help
> Select this if you are using one of Atmel's AT91SAM9261 or AT91SAM9G10 SoC.
>
> @@ -121,6 +128,7 @@ config SOC_AT91SAM9263
> select HAVE_FB_ATMEL
> select SOC_AT91SAM9
> select AT91_USE_OLD_CLK
> + select HAVE_AT91_USB_CLK
>
> config SOC_AT91SAM9RL
> bool "AT91SAM9RL"
> @@ -137,6 +145,7 @@ config SOC_AT91SAM9G45
> select SOC_AT91SAM9
> select AT91_USE_OLD_CLK
> select HAVE_AT91_UTMI
> + select HAVE_AT91_USB_CLK
> help
> Select this if you are using one of Atmel's AT91SAM9G45 family SoC.
> This support covers AT91SAM9G45, AT91SAM9G46, AT91SAM9M10 and AT91SAM9M11.
> @@ -148,6 +157,7 @@ config SOC_AT91SAM9X5
> select SOC_AT91SAM9
> select AT91_USE_OLD_CLK
> select HAVE_AT91_UTMI
> + select HAVE_AT91_USB_CLK
> help
> Select this if you are using one of Atmel's AT91SAM9x5 family SoC.
> This means that your SAM9 name finishes with a '5' (except if it is
> @@ -161,6 +171,7 @@ config SOC_AT91SAM9N12
> select HAVE_FB_ATMEL
> select SOC_AT91SAM9
> select AT91_USE_OLD_CLK
> + select HAVE_AT91_USB_CLK
> help
> Select this if you are using Atmel's AT91SAM9N12 SoC.
>
> diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
> index a824883..61db058 100644
> --- a/drivers/clk/at91/Makefile
> +++ b/drivers/clk/at91/Makefile
> @@ -8,3 +8,4 @@ obj-y += clk-system.o clk-peripheral.o
>
> obj-$(CONFIG_AT91_PROGRAMMABLE_CLOCKS) += clk-programmable.o
> obj-$(CONFIG_HAVE_AT91_UTMI) += clk-utmi.o
> +obj-$(CONFIG_HAVE_AT91_USB_CLK) += clk-usb.o
> diff --git a/drivers/clk/at91/clk-usb.c b/drivers/clk/at91/clk-usb.c
> new file mode 100644
> index 0000000..12c20a0
> --- /dev/null
> +++ b/drivers/clk/at91/clk-usb.c
> @@ -0,0 +1,323 @@
> +/*
> + * drivers/clk/at91/clk-usb.c
> + *
> + * Copyright (C) 2013 Boris BREZILLON <b.brezillon@...rkiz.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 USB_SOURCE_MAX 2
> +
> +#define to_at91sam9x5_clk_usb(hw) \
> + container_of(hw, struct at91sam9x5_clk_usb, hw)
> +struct at91sam9x5_clk_usb {
> + struct clk_hw hw;
> + struct at91_pmc *pmc;
> + u8 usbs0_unused; /* sam9n12 uses usbs0 to disable usb clock */
Same remark as PLL patch. So maybe make the sam9n12 as a special case.
> +};
> +
> +#define to_at91rm9200_clk_usb(hw) \
> + container_of(hw, struct at91rm9200_clk_usb, hw)
> +struct at91rm9200_clk_usb {
> + struct clk_hw hw;
> + struct at91_pmc *pmc;
> + u32 divisors[4];
> +};
> +
> +static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + u32 tmp;
> + u8 usbdiv;
> + struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
> + struct at91_pmc *pmc = usb->pmc;
> +
> + tmp = pmc_read(pmc, AT91_PMC_USB);
> + usbdiv = (tmp & AT91_PMC_OHCIUSBDIV) >> 8;
> + return parent_rate / (usbdiv + 1);
> +}
> +
> +static long at91sam9x5_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long *parent_rate)
> +{
> + unsigned long div;
> + unsigned long bestrate;
> + unsigned long tmp;
> +
> + if (rate >= *parent_rate)
> + return *parent_rate;
> +
> + div = *parent_rate / rate;
> + if (div > 15)
> + return *parent_rate / 16;
> +
> + bestrate = *parent_rate / div;
> + tmp = *parent_rate / (div + 1);
> + if (bestrate - rate > rate - tmp)
> + bestrate = tmp;
> +
> + return bestrate;
> +}
> +
> +static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
> +{
> + u32 tmp;
> + struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
> + struct at91_pmc *pmc = usb->pmc;
> +
> + if (usb->usbs0_unused)
> + index++;
> + if (index > 1)
> + return -EINVAL;
> + tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS;
> + if (index)
> + tmp |= AT91_PMC_USBS;
> + pmc_write(pmc, AT91_PMC_USB, tmp);
> + return 0;
> +}
> +
> +static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
> +{
> + struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
> + struct at91_pmc *pmc = usb->pmc;
> +
> + if (usb->usbs0_unused)
> + return 0;
> +
> + return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS;
> +}
> +
> +static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long parent_rate)
> +{
> + u32 tmp;
> + struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
> + struct at91_pmc *pmc = usb->pmc;
> + unsigned long div = parent_rate / rate;
> +
> + if (parent_rate % rate || div < 1 || div > 16)
> + return -EINVAL;
> +
> + tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV;
> + tmp |= (div - 1) << 8;
> + pmc_write(pmc, AT91_PMC_USB, tmp);
> +
> + return 0;
> +}
> +
> +static const struct clk_ops at91sam9x5_usb_ops = {
> + .recalc_rate = at91sam9x5_clk_usb_recalc_rate,
> + .round_rate = at91sam9x5_clk_usb_round_rate,
> + .get_parent = at91sam9x5_clk_usb_get_parent,
> + .set_parent = at91sam9x5_clk_usb_set_parent,
> + .set_rate = at91sam9x5_clk_usb_set_rate,
> +};
> +
> +static struct clk * __init
> +at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name,
> + const char **parent_names, u8 num_parents,
> + u8 usbs0_unused)
> +{
> + struct at91sam9x5_clk_usb *usb;
> + struct clk *clk = NULL;
> + struct clk_init_data init;
> +
> + usb = kzalloc(sizeof(*usb), GFP_KERNEL);
> + if (!usb)
> + return ERR_PTR(-ENOMEM);
> +
> + init.name = name;
> + init.ops = &at91sam9x5_usb_ops;
> + init.parent_names = parent_names;
> + init.num_parents = num_parents;
> + init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
> +
> + usb->usbs0_unused = usbs0_unused;
> + usb->hw.init = &init;
> + usb->pmc = pmc;
> +
> + clk = clk_register(NULL, &usb->hw);
> +
> + if (IS_ERR(clk))
> + kfree(usb);
> +
> + return clk;
> +}
> +
> +static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
> + struct at91_pmc *pmc = usb->pmc;
> + u32 tmp;
> + u8 usbdiv;
> +
> + tmp = pmc_read(pmc, AT91_CKGR_PLLBR);
> + usbdiv = (tmp & AT91_PMC_USBDIV) >> 28;
macro
> + if (usb->divisors[usbdiv])
> + return parent_rate / usb->divisors[usbdiv];
> +
> + return 0;
> +}
> +
> +static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long *parent_rate)
> +{
> + struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
> + unsigned long bestrate = 0;
> + int bestdiff = -1;
> + unsigned long tmprate;
> + int tmpdiff;
> + int i = 0;
> +
> + for (i = 0; i < 4; i++) {
> + if (!usb->divisors[i])
> + continue;
> + tmprate = *parent_rate / usb->divisors[i];
> + if (tmprate < rate)
> + tmpdiff = rate - tmprate;
> + else
> + tmpdiff = tmprate - rate;
> +
> + if (bestdiff < 0 || bestdiff > tmpdiff) {
> + bestrate = tmprate;
> + bestdiff = tmpdiff;
> + }
> +
> + if (!bestdiff)
> + break;
> + }
> +
> + return bestrate;
> +}
> +
> +static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long parent_rate)
> +{
> + u32 tmp;
> + int i;
> + struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
> + struct at91_pmc *pmc = usb->pmc;
> + unsigned long div = parent_rate / rate;
> +
> + if (parent_rate % rate)
> + return -EINVAL;
> + for (i = 0; i < 4; i++) {
> + if (usb->divisors[i] == div) {
> + tmp = pmc_read(pmc, AT91_CKGR_PLLBR) &
> + ~AT91_PMC_USBDIV;
> + tmp |= i << 8;
> + pmc_write(pmc, AT91_PMC_USB, tmp);
> + return 0;
> + }
> + }
> +
> + return -EINVAL;
> +}
> +
> +static const struct clk_ops at91rm9200_usb_ops = {
> + .recalc_rate = at91rm9200_clk_usb_recalc_rate,
> + .round_rate = at91rm9200_clk_usb_round_rate,
> + .set_rate = at91rm9200_clk_usb_set_rate,
> +};
> +
> +static struct clk * __init
> +at91rm9200_clk_register_usb(struct at91_pmc *pmc, const char *name,
> + const char *parent_name, const u32 *divisors)
> +{
> + struct at91rm9200_clk_usb *usb;
> + struct clk *clk = NULL;
> + struct clk_init_data init;
> +
> + usb = kzalloc(sizeof(*usb), GFP_KERNEL);
> + if (!usb)
> + return ERR_PTR(-ENOMEM);
> +
> + init.name = name;
> + init.ops = &at91rm9200_usb_ops;
> + init.parent_names = &parent_name;
> + init.num_parents = 1;
> + init.flags = 0;
> +
> + usb->hw.init = &init;
> + usb->pmc = pmc;
> + memcpy(usb->divisors, divisors, sizeof(usb->divisors));
> +
> + clk = clk_register(NULL, &usb->hw);
> +
> + if (IS_ERR(clk))
> + kfree(usb);
> +
> + return clk;
> +}
> +
> +void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
> + struct at91_pmc *pmc)
> +{
> + struct clk *clk;
> + int i;
> + int num_parents;
> + u8 usbs0_unused;
> + const char *parent_names[USB_SOURCE_MAX];
> + const char *name = np->name;
> +
> + num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
> + if (num_parents <= 0 || num_parents > USB_SOURCE_MAX)
> + return;
> +
> + for (i = 0; i < num_parents; i++) {
> + parent_names[i] = of_clk_get_parent_name(np, i);
> + if (!parent_names[i])
> + return;
> + }
> +
> + usbs0_unused = of_property_read_bool(np, "atmel,usb-clk-src0-unused");
> + of_property_read_string(np, "clock-output-names", &name);
> +
> + clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents,
> + usbs0_unused);
> +
> + if (IS_ERR(clk))
> + return;
> +
> + of_clk_add_provider(np, of_clk_src_simple_get, clk);
> +}
> +
> +void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
> + struct at91_pmc *pmc)
> +{
> + struct clk *clk;
> + const char *parent_name;
> + const char *name = np->name;
> + u32 divisors[4] = {0, 0, 0, 0};
> +
> + parent_name = of_clk_get_parent_name(np, 0);
> + if (!parent_name)
> + return;
> +
> + of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4);
> + if (!divisors[0])
> + return;
> +
> + of_property_read_string(np, "clock-output-names", &name);
> +
> + clk = at91rm9200_clk_register_usb(pmc, name, parent_name, divisors);
> +
> + if (IS_ERR(clk))
> + return;
> +
> + of_clk_add_provider(np, of_clk_src_simple_get, clk);
> +}
> diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
> index 238f0d2..e46de3d 100644
> --- a/drivers/clk/at91/pmc.c
> +++ b/drivers/clk/at91/pmc.c
> @@ -287,6 +287,17 @@ static const struct of_device_id pmc_clk_ids[] __initdata = {
> .data = of_at91sam9x5_clk_utmi_setup,
> },
> #endif
> + /* USB clock */
> +#if defined(CONFIG_HAVE_AT91_USB_CLK)
> + {
> + .compatible = "atmel,at91rm9200-clk-usb",
> + .data = of_at91rm9200_clk_usb_setup,
> + },
> + {
> + .compatible = "atmel,at91sam9x5-clk-usb",
> + .data = of_at91sam9x5_clk_usb_setup,
> + },
> +#endif
> { /*sentinel*/ }
> };
>
> diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
> index 3ba9503..b2efff5 100644
> --- a/drivers/clk/at91/pmc.h
> +++ b/drivers/clk/at91/pmc.h
> @@ -96,4 +96,11 @@ extern void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np,
> struct at91_pmc *pmc);
> #endif
>
> +#if defined(CONFIG_HAVE_AT91_USB_CLK)
> +extern void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
> + struct at91_pmc *pmc);
> +extern void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
> + struct at91_pmc *pmc);
> +#endif
> +
> #endif /* __PMC_H_ */
>
--
Nicolas Ferre
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