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48cd30b495
In some cases, there is a need to enable a clock as part of
clock enable callback of a different clock. For example, USB
2.0 PHY clock enable requires USB 2.0 clock to be enabled.
In this case, it is safe to instead call __clk_enable()
since the clock framework lock is already taken. Calling
clk_enable() causes recursive locking error.
A similar case arises in the clock disable path.
To enable such usage, make __clk_{enable,disable} functions
publicly available outside of clock.c. Also, call them
davinci_clk_{enable|disable} now to be consistent with how
other davinci-specific clock functions are named.
Note that these functions are not exported to drivers. They
are meant for usage in platform specific clock management
code.
Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Suggested-by: David Lechner <david@lechnology.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/*
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* TI DaVinci clock definitions
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*
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* Copyright (C) 2006-2007 Texas Instruments.
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* Copyright (C) 2008-2009 Deep Root Systems, LLC
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ARCH_ARM_DAVINCI_CLOCK_H
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#define __ARCH_ARM_DAVINCI_CLOCK_H
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#define DAVINCI_PLL1_BASE 0x01c40800
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#define DAVINCI_PLL2_BASE 0x01c40c00
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#define MAX_PLL 2
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/* PLL/Reset register offsets */
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#define PLLCTL 0x100
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#define PLLCTL_PLLEN BIT(0)
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#define PLLCTL_PLLPWRDN BIT(1)
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#define PLLCTL_PLLRST BIT(3)
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#define PLLCTL_PLLDIS BIT(4)
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#define PLLCTL_PLLENSRC BIT(5)
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#define PLLCTL_CLKMODE BIT(8)
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#define PLLM 0x110
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#define PLLM_PLLM_MASK 0xff
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#define PREDIV 0x114
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#define PLLDIV1 0x118
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#define PLLDIV2 0x11c
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#define PLLDIV3 0x120
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#define POSTDIV 0x128
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#define BPDIV 0x12c
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#define PLLCMD 0x138
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#define PLLSTAT 0x13c
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#define PLLALNCTL 0x140
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#define PLLDCHANGE 0x144
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#define PLLCKEN 0x148
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#define PLLCKSTAT 0x14c
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#define PLLSYSTAT 0x150
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#define PLLDIV4 0x160
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#define PLLDIV5 0x164
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#define PLLDIV6 0x168
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#define PLLDIV7 0x16c
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#define PLLDIV8 0x170
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#define PLLDIV9 0x174
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#define PLLDIV_EN BIT(15)
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#define PLLDIV_RATIO_MASK 0x1f
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/*
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* OMAP-L138 system reference guide recommends a wait for 4 OSCIN/CLKIN
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* cycles to ensure that the PLLC has switched to bypass mode. Delay of 1us
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* ensures we are good for all > 4MHz OSCIN/CLKIN inputs. Typically the input
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* is ~25MHz. Units are micro seconds.
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*/
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#define PLL_BYPASS_TIME 1
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/* From OMAP-L138 datasheet table 6-4. Units are micro seconds */
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#define PLL_RESET_TIME 1
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/*
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* From OMAP-L138 datasheet table 6-4; assuming prediv = 1, sqrt(pllm) = 4
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* Units are micro seconds.
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*/
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#define PLL_LOCK_TIME 20
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#ifndef __ASSEMBLER__
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#include <linux/list.h>
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#include <linux/clkdev.h>
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#define PLLSTAT_GOSTAT BIT(0)
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#define PLLCMD_GOSET BIT(0)
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struct pll_data {
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u32 phys_base;
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void __iomem *base;
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u32 num;
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u32 flags;
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u32 input_rate;
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u32 div_ratio_mask;
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};
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#define PLL_HAS_PREDIV 0x01
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#define PLL_HAS_POSTDIV 0x02
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struct clk {
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struct list_head node;
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struct module *owner;
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const char *name;
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unsigned long rate;
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unsigned long maxrate; /* H/W supported max rate */
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u8 usecount;
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u8 lpsc;
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u8 gpsc;
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u8 domain;
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u32 flags;
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struct clk *parent;
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struct list_head children; /* list of children */
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struct list_head childnode; /* parent's child list node */
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struct pll_data *pll_data;
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u32 div_reg;
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unsigned long (*recalc) (struct clk *);
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int (*set_rate) (struct clk *clk, unsigned long rate);
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int (*round_rate) (struct clk *clk, unsigned long rate);
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int (*reset) (struct clk *clk, bool reset);
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void (*clk_enable) (struct clk *clk);
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void (*clk_disable) (struct clk *clk);
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int (*set_parent) (struct clk *clk, struct clk *parent);
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};
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/* Clock flags: SoC-specific flags start at BIT(16) */
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#define ALWAYS_ENABLED BIT(1)
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#define CLK_PSC BIT(2)
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#define CLK_PLL BIT(3) /* PLL-derived clock */
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#define PRE_PLL BIT(4) /* source is before PLL mult/div */
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#define PSC_SWRSTDISABLE BIT(5) /* Disable state is SwRstDisable */
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#define PSC_FORCE BIT(6) /* Force module state transtition */
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#define PSC_LRST BIT(8) /* Use local reset on enable/disable */
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#define CLK(dev, con, ck) \
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{ \
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.dev_id = dev, \
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.con_id = con, \
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.clk = ck, \
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} \
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int davinci_clk_init(struct clk_lookup *clocks);
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int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv,
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unsigned int mult, unsigned int postdiv);
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int davinci_set_sysclk_rate(struct clk *clk, unsigned long rate);
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int davinci_set_refclk_rate(unsigned long rate);
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int davinci_simple_set_rate(struct clk *clk, unsigned long rate);
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int davinci_clk_reset(struct clk *clk, bool reset);
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void davinci_clk_enable(struct clk *clk);
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void davinci_clk_disable(struct clk *clk);
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extern struct platform_device davinci_wdt_device;
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extern void davinci_watchdog_reset(struct platform_device *);
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#endif
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#endif
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