1e45860f54
The AMBA bus regulator support is being used to model on/off switches for power domains which isn't terribly idiomatic for modern kernels with the generic power domain code and creates integration problems on platforms which don't use regulators for their power domains as it's hard to tell the difference between a regulator that is needed but failed to be provided and one that isn't supposed to be there (though DT does make that easier). Platforms that wish to use the regulator API to manage their power domains can indirect via the power domain interface. This feature is only used with the vape supply of the db8500 PRCMU driver which supplies the UARTs and MMC controllers, none of which have support for managing vcore at runtime in mainline (only pl022 SPI controller does). Update that supply to have an always_on constraint until the power domain support for the system is updated so that it is enabled for these users, this is likely to have no impact on practical systems as probably at least one of these devices will be active and cause AMBA to hold the supply on anyway. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
130 lines
4 KiB
C
130 lines
4 KiB
C
/*
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* linux/include/amba/bus.h
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*
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* This device type deals with ARM PrimeCells and anything else that
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* presents a proper CID (0xB105F00D) at the end of the I/O register
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* region or that is derived from a PrimeCell.
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*
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* Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
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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 ASMARM_AMBA_H
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#define ASMARM_AMBA_H
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/err.h>
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#include <linux/resource.h>
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#include <linux/regulator/consumer.h>
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#define AMBA_NR_IRQS 2
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#define AMBA_CID 0xb105f00d
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struct clk;
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struct amba_device {
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struct device dev;
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struct resource res;
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struct clk *pclk;
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u64 dma_mask;
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unsigned int periphid;
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unsigned int irq[AMBA_NR_IRQS];
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};
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struct amba_driver {
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struct device_driver drv;
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int (*probe)(struct amba_device *, const struct amba_id *);
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int (*remove)(struct amba_device *);
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void (*shutdown)(struct amba_device *);
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int (*suspend)(struct amba_device *, pm_message_t);
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int (*resume)(struct amba_device *);
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const struct amba_id *id_table;
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};
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enum amba_vendor {
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AMBA_VENDOR_ARM = 0x41,
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AMBA_VENDOR_ST = 0x80,
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};
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extern struct bus_type amba_bustype;
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#define to_amba_device(d) container_of(d, struct amba_device, dev)
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#define amba_get_drvdata(d) dev_get_drvdata(&d->dev)
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#define amba_set_drvdata(d,p) dev_set_drvdata(&d->dev, p)
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int amba_driver_register(struct amba_driver *);
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void amba_driver_unregister(struct amba_driver *);
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struct amba_device *amba_device_alloc(const char *, resource_size_t, size_t);
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void amba_device_put(struct amba_device *);
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int amba_device_add(struct amba_device *, struct resource *);
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int amba_device_register(struct amba_device *, struct resource *);
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void amba_device_unregister(struct amba_device *);
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struct amba_device *amba_find_device(const char *, struct device *, unsigned int, unsigned int);
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int amba_request_regions(struct amba_device *, const char *);
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void amba_release_regions(struct amba_device *);
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#define amba_pclk_enable(d) \
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(IS_ERR((d)->pclk) ? 0 : clk_enable((d)->pclk))
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#define amba_pclk_disable(d) \
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do { if (!IS_ERR((d)->pclk)) clk_disable((d)->pclk); } while (0)
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/* Some drivers don't use the struct amba_device */
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#define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
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#define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
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#define AMBA_MANF_BITS(a) (((a) >> 12) & 0xff)
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#define AMBA_PART_BITS(a) ((a) & 0xfff)
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#define amba_config(d) AMBA_CONFIG_BITS((d)->periphid)
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#define amba_rev(d) AMBA_REV_BITS((d)->periphid)
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#define amba_manf(d) AMBA_MANF_BITS((d)->periphid)
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#define amba_part(d) AMBA_PART_BITS((d)->periphid)
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#define __AMBA_DEV(busid, data, mask) \
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{ \
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.coherent_dma_mask = mask, \
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.init_name = busid, \
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.platform_data = data, \
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}
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/*
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* APB devices do not themselves have the ability to address memory,
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* so DMA masks should be zero (much like USB peripheral devices.)
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* The DMA controller DMA masks should be used instead (much like
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* USB host controllers in conventional PCs.)
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*/
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#define AMBA_APB_DEVICE(name, busid, id, base, irqs, data) \
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struct amba_device name##_device = { \
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.dev = __AMBA_DEV(busid, data, 0), \
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.res = DEFINE_RES_MEM(base, SZ_4K), \
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.irq = irqs, \
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.periphid = id, \
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}
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/*
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* AHB devices are DMA capable, so set their DMA masks
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*/
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#define AMBA_AHB_DEVICE(name, busid, id, base, irqs, data) \
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struct amba_device name##_device = { \
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.dev = __AMBA_DEV(busid, data, ~0ULL), \
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.res = DEFINE_RES_MEM(base, SZ_4K), \
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.dma_mask = ~0ULL, \
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.irq = irqs, \
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.periphid = id, \
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}
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/*
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* module_amba_driver() - Helper macro for drivers that don't do anything
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* special in module init/exit. This eliminates a lot of boilerplate. Each
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* module may only use this macro once, and calling it replaces module_init()
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* and module_exit()
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*/
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#define module_amba_driver(__amba_drv) \
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module_driver(__amba_drv, amba_driver_register, amba_driver_unregister)
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#endif
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