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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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c78a5bc2e7
The earlier watchdog reset mechanism had a couple of limitations. First, it embedded a reference to "davinci_wdt_device" inside common code. This forced all derived platforms (da8xx and tnetv107x) to define such a device. This also would have caused problems in including multiple socs in a single build due to symbol redefinition. With this patch, davinci_watchdog_reset() now takes the platform device as an argument. The davinci_soc_info struct has been extended to include a reset function and a watchdog platform_device. arch_reset() then uses these elements to reset the system in a SoC specific fashion. Signed-off-by: Cyril Chemparathy <cyril@ti.com> Tested-by: Sandeep Paulraj <s-paulraj@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
128 lines
3.4 KiB
C
128 lines
3.4 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 <asm/clkdev.h>
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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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u8 usecount;
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u8 lpsc;
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u8 gpsc;
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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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};
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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 PSC_DSP BIT(3) /* PSC uses DSP domain, not ARM */
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#define CLK_PLL BIT(4) /* PLL-derived clock */
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#define PRE_PLL BIT(5) /* source is before PLL mult/div */
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#define PSC_SWRSTDISABLE BIT(6) /* Disable state is SwRstDisable */
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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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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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