88e0abcd7a
This is a platform driver for Versatile Express' "system register" block. It's a random collection of registers providing the following functionality: - low level platform functions like board ID access; in order to use those, the driver must be initialized early, either statically or based on the DT - config bus bridge via "system control" interface; as the response from the controller does not generate interrupt (yet), the status register is periodically polled using a timer - pseudo GPIO lines providing MMC card status and Flash WP# signal control - LED interface for a set of 8 LEDs on the motherboard, with "heartbeat", "mmc0" and "cpu0" to "cpu5" as default triggers Signed-off-by: Pawel Moll <pawel.moll@arm.com>
111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
/*
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2012 ARM Limited
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*/
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#ifndef _LINUX_VEXPRESS_H
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#define _LINUX_VEXPRESS_H
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#include <linux/device.h>
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#define VEXPRESS_SITE_MB 0
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#define VEXPRESS_SITE_DB1 1
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#define VEXPRESS_SITE_DB2 2
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#define VEXPRESS_SITE_MASTER 0xf
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#define VEXPRESS_CONFIG_STATUS_DONE 0
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#define VEXPRESS_CONFIG_STATUS_WAIT 1
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#define VEXPRESS_GPIO_MMC_CARDIN 0
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#define VEXPRESS_GPIO_MMC_WPROT 1
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#define VEXPRESS_GPIO_FLASH_WPn 2
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#define VEXPRESS_RES_FUNC(_site, _func) \
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{ \
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.start = (_site), \
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.end = (_func), \
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.flags = IORESOURCE_BUS, \
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}
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/* Config bridge API */
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/**
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* struct vexpress_config_bridge_info - description of the platform
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* configuration infrastructure bridge.
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*
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* @name: Bridge name
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*
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* @func_get: Obtains pointer to a configuration function for a given
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* device or a Device Tree node, to be used with @func_put
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* and @func_exec. The node pointer should take precedence
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* over device pointer when both are passed.
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*
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* @func_put: Tells the bridge that the function will not be used any
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* more, so all allocated resources can be released.
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*
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* @func_exec: Executes a configuration function read or write operation.
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* The offset selects a 32 bit word of the value accessed.
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* Must return VEXPRESS_CONFIG_STATUS_DONE when operation
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* is finished immediately, VEXPRESS_CONFIG_STATUS_WAIT when
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* will be completed in some time or negative value in case
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* of error.
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*/
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struct vexpress_config_bridge_info {
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const char *name;
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void *(*func_get)(struct device *dev, struct device_node *node);
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void (*func_put)(void *func);
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int (*func_exec)(void *func, int offset, bool write, u32 *data);
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};
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struct vexpress_config_bridge;
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struct vexpress_config_bridge *vexpress_config_bridge_register(
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struct device_node *node,
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struct vexpress_config_bridge_info *info);
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void vexpress_config_bridge_unregister(struct vexpress_config_bridge *bridge);
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void vexpress_config_complete(struct vexpress_config_bridge *bridge,
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int status);
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/* Config function API */
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struct vexpress_config_func;
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struct vexpress_config_func *__vexpress_config_func_get(struct device *dev,
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struct device_node *node);
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#define vexpress_config_func_get_by_dev(dev) \
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__vexpress_config_func_get(dev, NULL)
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#define vexpress_config_func_get_by_node(node) \
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__vexpress_config_func_get(NULL, node)
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void vexpress_config_func_put(struct vexpress_config_func *func);
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/* Both may sleep! */
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int vexpress_config_read(struct vexpress_config_func *func, int offset,
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u32 *data);
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int vexpress_config_write(struct vexpress_config_func *func, int offset,
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u32 data);
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/* Platform control */
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u32 vexpress_get_procid(int site);
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u32 vexpress_get_hbi(int site);
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void *vexpress_get_24mhz_clock_base(void);
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void vexpress_flags_set(u32 data);
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#define vexpress_get_site_by_node(node) __vexpress_get_site(NULL, node)
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#define vexpress_get_site_by_dev(dev) __vexpress_get_site(dev, NULL)
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unsigned __vexpress_get_site(struct device *dev, struct device_node *node);
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void vexpress_sysreg_early_init(void __iomem *base);
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void vexpress_sysreg_of_early_init(void);
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#endif
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