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65500fa94a
On some contemporary sub-micron SoCs, peripherals on the chip have power domain switches, i.e. the voltage to the core may be turned off to conserve power. In the Ux500 we have this for out PrimeCell derivates. This patch makes it possible to specify an (optional) regulator to handle the voltage domain switch on AMBA PrimeCells, modeled very similar to how block clocks are handled. Additional amba_vcore_[enable|disable] calls are supplied to make it possible introduce optional powering off of the core voltage. Using this will require code to spool/unspool any core HW state. Cc: Rabin Vincent <rabin.vincent@stericsson.com> Cc: Bengt Jonsson <bengt.g.jonsson@stericsson.com> Cc: Jonas Aaberg <jonas.aberg@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
94 lines
2.7 KiB
C
94 lines
2.7 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/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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struct regulator *vcore;
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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_id {
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unsigned int id;
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unsigned int mask;
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void *data;
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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 *, 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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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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#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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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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#define amba_vcore_enable(d) \
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(IS_ERR((d)->vcore) ? 0 : regulator_enable((d)->vcore))
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#define amba_vcore_disable(d) \
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do { if (!IS_ERR((d)->vcore)) regulator_disable((d)->vcore); } 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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#endif
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