clk: at91: add PMC usb clock
This patch adds new at91 usb clock implementation using common clk framework. This clock is used to clock usb ports (ohci, ehci and udc). Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Boris BREZILLON
Nicolas Ferre
Родитель
f090fb37de
Коммит
c84a61d872
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@ -3,6 +3,9 @@ if ARCH_AT91
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config HAVE_AT91_UTMI
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bool
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config HAVE_AT91_USB_CLK
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bool
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config HAVE_AT91_DBGU0
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bool
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@ -82,6 +85,7 @@ config SOC_SAMA5D3
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select HAVE_AT91_DBGU1
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select AT91_USE_OLD_CLK
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select HAVE_AT91_UTMI
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select HAVE_AT91_USB_CLK
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help
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Select this if you are using one of Atmel's SAMA5D3 family SoC.
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This support covers SAMA5D31, SAMA5D33, SAMA5D34, SAMA5D35.
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@ -96,12 +100,14 @@ config SOC_AT91RM9200
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select MULTI_IRQ_HANDLER
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select SPARSE_IRQ
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select AT91_USE_OLD_CLK
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select HAVE_AT91_USB_CLK
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config SOC_AT91SAM9260
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bool "AT91SAM9260, AT91SAM9XE or AT91SAM9G20"
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select HAVE_AT91_DBGU0
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select SOC_AT91SAM9
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select AT91_USE_OLD_CLK
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select HAVE_AT91_USB_CLK
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help
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Select this if you are using one of Atmel's AT91SAM9260, AT91SAM9XE
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or AT91SAM9G20 SoC.
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@ -112,6 +118,7 @@ config SOC_AT91SAM9261
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select HAVE_FB_ATMEL
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select SOC_AT91SAM9
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select AT91_USE_OLD_CLK
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select HAVE_AT91_USB_CLK
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help
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Select this if you are using one of Atmel's AT91SAM9261 or AT91SAM9G10 SoC.
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@ -121,6 +128,7 @@ config SOC_AT91SAM9263
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select HAVE_FB_ATMEL
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select SOC_AT91SAM9
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select AT91_USE_OLD_CLK
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select HAVE_AT91_USB_CLK
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config SOC_AT91SAM9RL
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bool "AT91SAM9RL"
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@ -137,6 +145,7 @@ config SOC_AT91SAM9G45
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select SOC_AT91SAM9
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select AT91_USE_OLD_CLK
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select HAVE_AT91_UTMI
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select HAVE_AT91_USB_CLK
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help
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Select this if you are using one of Atmel's AT91SAM9G45 family SoC.
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This support covers AT91SAM9G45, AT91SAM9G46, AT91SAM9M10 and AT91SAM9M11.
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@ -148,6 +157,7 @@ config SOC_AT91SAM9X5
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select SOC_AT91SAM9
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select AT91_USE_OLD_CLK
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select HAVE_AT91_UTMI
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select HAVE_AT91_USB_CLK
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help
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Select this if you are using one of Atmel's AT91SAM9x5 family SoC.
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This means that your SAM9 name finishes with a '5' (except if it is
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@ -161,6 +171,7 @@ config SOC_AT91SAM9N12
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select HAVE_FB_ATMEL
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select SOC_AT91SAM9
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select AT91_USE_OLD_CLK
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select HAVE_AT91_USB_CLK
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help
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Select this if you are using Atmel's AT91SAM9N12 SoC.
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@ -8,3 +8,4 @@ obj-y += clk-system.o clk-peripheral.o
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obj-$(CONFIG_AT91_PROGRAMMABLE_CLOCKS) += clk-programmable.o
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obj-$(CONFIG_HAVE_AT91_UTMI) += clk-utmi.o
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obj-$(CONFIG_HAVE_AT91_USB_CLK) += clk-usb.o
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@ -0,0 +1,398 @@
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/*
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* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/at91_pmc.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/io.h>
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#include "pmc.h"
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#define USB_SOURCE_MAX 2
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#define SAM9X5_USB_DIV_SHIFT 8
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#define SAM9X5_USB_MAX_DIV 0xf
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#define RM9200_USB_DIV_SHIFT 28
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#define RM9200_USB_DIV_TAB_SIZE 4
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struct at91sam9x5_clk_usb {
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struct clk_hw hw;
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struct at91_pmc *pmc;
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};
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#define to_at91sam9x5_clk_usb(hw) \
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container_of(hw, struct at91sam9x5_clk_usb, hw)
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struct at91rm9200_clk_usb {
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struct clk_hw hw;
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struct at91_pmc *pmc;
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u32 divisors[4];
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};
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#define to_at91rm9200_clk_usb(hw) \
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container_of(hw, struct at91rm9200_clk_usb, hw)
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static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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u32 tmp;
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u8 usbdiv;
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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struct at91_pmc *pmc = usb->pmc;
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tmp = pmc_read(pmc, AT91_PMC_USB);
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usbdiv = (tmp & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;
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return parent_rate / (usbdiv + 1);
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}
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static long at91sam9x5_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *parent_rate)
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{
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unsigned long div;
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unsigned long bestrate;
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unsigned long tmp;
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if (rate >= *parent_rate)
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return *parent_rate;
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div = *parent_rate / rate;
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if (div >= SAM9X5_USB_MAX_DIV)
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return *parent_rate / (SAM9X5_USB_MAX_DIV + 1);
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bestrate = *parent_rate / div;
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tmp = *parent_rate / (div + 1);
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if (bestrate - rate > rate - tmp)
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bestrate = tmp;
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return bestrate;
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}
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static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
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{
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u32 tmp;
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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struct at91_pmc *pmc = usb->pmc;
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if (index > 1)
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return -EINVAL;
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tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS;
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if (index)
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tmp |= AT91_PMC_USBS;
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pmc_write(pmc, AT91_PMC_USB, tmp);
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return 0;
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}
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static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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struct at91_pmc *pmc = usb->pmc;
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return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS;
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}
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static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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u32 tmp;
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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struct at91_pmc *pmc = usb->pmc;
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unsigned long div = parent_rate / rate;
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if (parent_rate % rate || div < 1 || div >= SAM9X5_USB_MAX_DIV)
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return -EINVAL;
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tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV;
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tmp |= (div - 1) << SAM9X5_USB_DIV_SHIFT;
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pmc_write(pmc, AT91_PMC_USB, tmp);
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return 0;
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}
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static const struct clk_ops at91sam9x5_usb_ops = {
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.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
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.round_rate = at91sam9x5_clk_usb_round_rate,
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.get_parent = at91sam9x5_clk_usb_get_parent,
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.set_parent = at91sam9x5_clk_usb_set_parent,
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.set_rate = at91sam9x5_clk_usb_set_rate,
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};
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static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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struct at91_pmc *pmc = usb->pmc;
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pmc_write(pmc, AT91_PMC_USB,
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pmc_read(pmc, AT91_PMC_USB) | AT91_PMC_USBS);
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return 0;
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}
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static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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struct at91_pmc *pmc = usb->pmc;
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pmc_write(pmc, AT91_PMC_USB,
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pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS);
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}
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static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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struct at91_pmc *pmc = usb->pmc;
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return !!(pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS);
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}
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static const struct clk_ops at91sam9n12_usb_ops = {
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.enable = at91sam9n12_clk_usb_enable,
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.disable = at91sam9n12_clk_usb_disable,
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.is_enabled = at91sam9n12_clk_usb_is_enabled,
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.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
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.round_rate = at91sam9x5_clk_usb_round_rate,
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.set_rate = at91sam9x5_clk_usb_set_rate,
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};
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static struct clk * __init
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at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name,
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const char **parent_names, u8 num_parents)
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{
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struct at91sam9x5_clk_usb *usb;
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struct clk *clk = NULL;
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struct clk_init_data init;
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usb = kzalloc(sizeof(*usb), GFP_KERNEL);
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if (!usb)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &at91sam9x5_usb_ops;
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init.parent_names = parent_names;
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init.num_parents = num_parents;
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init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
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usb->hw.init = &init;
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usb->pmc = pmc;
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clk = clk_register(NULL, &usb->hw);
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if (IS_ERR(clk))
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kfree(usb);
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return clk;
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}
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static struct clk * __init
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at91sam9n12_clk_register_usb(struct at91_pmc *pmc, const char *name,
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const char *parent_name)
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{
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struct at91sam9x5_clk_usb *usb;
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struct clk *clk = NULL;
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struct clk_init_data init;
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usb = kzalloc(sizeof(*usb), GFP_KERNEL);
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if (!usb)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &at91sam9n12_usb_ops;
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init.parent_names = &parent_name;
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init.num_parents = 1;
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init.flags = CLK_SET_RATE_GATE;
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usb->hw.init = &init;
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usb->pmc = pmc;
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clk = clk_register(NULL, &usb->hw);
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if (IS_ERR(clk))
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kfree(usb);
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return clk;
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}
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static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
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struct at91_pmc *pmc = usb->pmc;
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u32 tmp;
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u8 usbdiv;
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tmp = pmc_read(pmc, AT91_CKGR_PLLBR);
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usbdiv = (tmp & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
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if (usb->divisors[usbdiv])
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return parent_rate / usb->divisors[usbdiv];
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return 0;
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}
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static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *parent_rate)
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{
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struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
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unsigned long bestrate = 0;
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int bestdiff = -1;
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unsigned long tmprate;
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int tmpdiff;
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int i = 0;
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for (i = 0; i < 4; i++) {
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if (!usb->divisors[i])
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continue;
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tmprate = *parent_rate / usb->divisors[i];
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if (tmprate < rate)
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tmpdiff = rate - tmprate;
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else
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tmpdiff = tmprate - rate;
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if (bestdiff < 0 || bestdiff > tmpdiff) {
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bestrate = tmprate;
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bestdiff = tmpdiff;
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}
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if (!bestdiff)
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break;
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}
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return bestrate;
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}
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static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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u32 tmp;
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int i;
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struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
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struct at91_pmc *pmc = usb->pmc;
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unsigned long div = parent_rate / rate;
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if (parent_rate % rate)
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return -EINVAL;
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for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
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if (usb->divisors[i] == div) {
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tmp = pmc_read(pmc, AT91_CKGR_PLLBR) &
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~AT91_PMC_USBDIV;
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tmp |= i << RM9200_USB_DIV_SHIFT;
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pmc_write(pmc, AT91_CKGR_PLLBR, tmp);
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return 0;
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}
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}
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return -EINVAL;
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}
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static const struct clk_ops at91rm9200_usb_ops = {
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.recalc_rate = at91rm9200_clk_usb_recalc_rate,
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.round_rate = at91rm9200_clk_usb_round_rate,
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.set_rate = at91rm9200_clk_usb_set_rate,
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};
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static struct clk * __init
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at91rm9200_clk_register_usb(struct at91_pmc *pmc, const char *name,
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const char *parent_name, const u32 *divisors)
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{
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struct at91rm9200_clk_usb *usb;
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struct clk *clk = NULL;
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struct clk_init_data init;
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usb = kzalloc(sizeof(*usb), GFP_KERNEL);
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if (!usb)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &at91rm9200_usb_ops;
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init.parent_names = &parent_name;
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init.num_parents = 1;
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init.flags = 0;
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usb->hw.init = &init;
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usb->pmc = pmc;
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memcpy(usb->divisors, divisors, sizeof(usb->divisors));
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clk = clk_register(NULL, &usb->hw);
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||||
if (IS_ERR(clk))
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kfree(usb);
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return clk;
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}
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|
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void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
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||||
struct at91_pmc *pmc)
|
||||
{
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struct clk *clk;
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int i;
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||||
int num_parents;
|
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const char *parent_names[USB_SOURCE_MAX];
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const char *name = np->name;
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||||
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num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
|
||||
if (num_parents <= 0 || num_parents > USB_SOURCE_MAX)
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||||
return;
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for (i = 0; i < num_parents; i++) {
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parent_names[i] = of_clk_get_parent_name(np, i);
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||||
if (!parent_names[i])
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||||
return;
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}
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||||
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||||
of_property_read_string(np, "clock-output-names", &name);
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||||
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||||
clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents);
|
||||
if (IS_ERR(clk))
|
||||
return;
|
||||
|
||||
of_clk_add_provider(np, of_clk_src_simple_get, clk);
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}
|
||||
|
||||
void __init of_at91sam9n12_clk_usb_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);
|
||||
if (!parent_name)
|
||||
return;
|
||||
|
||||
of_property_read_string(np, "clock-output-names", &name);
|
||||
|
||||
clk = at91sam9n12_clk_register_usb(pmc, name, parent_name);
|
||||
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);
|
||||
}
|
||||
|
|
@ -299,6 +299,21 @@ static const struct of_device_id pmc_clk_ids[] __initdata = {
|
|||
.compatible = "atmel,at91sam9x5-clk-utmi",
|
||||
.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,
|
||||
},
|
||||
{
|
||||
.compatible = "atmel,at91sam9n12-clk-usb",
|
||||
.data = of_at91sam9n12_clk_usb_setup,
|
||||
},
|
||||
#endif
|
||||
{ /*sentinel*/ }
|
||||
};
|
||||
|
|
|
|||
|
|
@ -99,4 +99,13 @@ 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);
|
||||
extern void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,
|
||||
struct at91_pmc *pmc);
|
||||
#endif
|
||||
|
||||
#endif /* __PMC_H_ */
|
||||
|
|
|
|||
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