original development tree for Linux kernel GTP module; now long in mainline.
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/*
* arch/arm/plat-spear/include/plat/shirq.h
*
* SPEAr platform shared irq layer header file
*
* Copyright (C) 2009 ST Microelectronics
* Viresh Kumar <viresh.linux@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#ifndef __PLAT_SHIRQ_H
#define __PLAT_SHIRQ_H
#include <linux/irq.h>
#include <linux/types.h>
/*
* struct shirq_dev_config: shared irq device configuration
*
* virq: virtual irq number of device
* enb_mask: enable mask of device
* status_mask: status mask of device
* clear_mask: clear mask of device
*/
struct shirq_dev_config {
u32 virq;
u32 enb_mask;
u32 status_mask;
u32 clear_mask;
};
/*
* struct shirq_regs: shared irq register configuration
*
* base: base address of shared irq register
* enb_reg: enable register offset
* reset_to_enb: val 1 indicates, we need to clear bit for enabling interrupt
* status_reg: status register offset
* status_reg_mask: status register valid mask
* clear_reg: clear register offset
* reset_to_clear: val 1 indicates, we need to clear bit for clearing interrupt
*/
struct shirq_regs {
void __iomem *base;
u32 enb_reg;
u32 reset_to_enb;
u32 status_reg;
u32 status_reg_mask;
u32 clear_reg;
u32 reset_to_clear;
};
/*
* struct spear_shirq: shared irq structure
*
* irq: hardware irq number
* dev_config: array of device config structures which are using "irq" line
* dev_count: size of dev_config array
* regs: register configuration for shared irq block
*/
struct spear_shirq {
u32 irq;
struct shirq_dev_config *dev_config;
u32 dev_count;
struct shirq_regs regs;
};
int spear_shirq_register(struct spear_shirq *shirq);
#endif /* __PLAT_SHIRQ_H */