/* * RapidIO configuration space access support * * Copyright 2005 MontaVista Software, Inc. * Matt Porter <mporter@kernel.crashing.org> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/rio.h> #include <linux/module.h> /* * These interrupt-safe spinlocks protect all accesses to RIO * configuration space and doorbell access. */ static DEFINE_SPINLOCK(rio_config_lock); static DEFINE_SPINLOCK(rio_doorbell_lock); /* * Wrappers for all RIO configuration access functions. They just check * alignment, do locking and call the low-level functions pointed to * by rio_mport->ops. */ #define RIO_8_BAD 0 #define RIO_16_BAD (offset & 1) #define RIO_32_BAD (offset & 3) /** * RIO_LOP_READ - Generate rio_local_read_config_* functions * @size: Size of configuration space read (8, 16, 32 bits) * @type: C type of value argument * @len: Length of configuration space read (1, 2, 4 bytes) * * Generates rio_local_read_config_* functions used to access * configuration space registers on the local device. */ #define RIO_LOP_READ(size,type,len) \ int __rio_local_read_config_##size \ (struct rio_mport *mport, u32 offset, type *value) \ { \ int res; \ unsigned long flags; \ u32 data = 0; \ if (RIO_##size##_BAD) return RIO_BAD_SIZE; \ spin_lock_irqsave(&rio_config_lock, flags); \ res = mport->ops->lcread(mport->id, offset, len, &data); \ *value = (type)data; \ spin_unlock_irqrestore(&rio_config_lock, flags); \ return res; \ } /** * RIO_LOP_WRITE - Generate rio_local_write_config_* functions * @size: Size of configuration space write (8, 16, 32 bits) * @type: C type of value argument * @len: Length of configuration space write (1, 2, 4 bytes) * * Generates rio_local_write_config_* functions used to access * configuration space registers on the local device. */ #define RIO_LOP_WRITE(size,type,len) \ int __rio_local_write_config_##size \ (struct rio_mport *mport, u32 offset, type value) \ { \ int res; \ unsigned long flags; \ if (RIO_##size##_BAD) return RIO_BAD_SIZE; \ spin_lock_irqsave(&rio_config_lock, flags); \ res = mport->ops->lcwrite(mport->id, offset, len, value); \ spin_unlock_irqrestore(&rio_config_lock, flags); \ return res; \ } RIO_LOP_READ(8, u8, 1) RIO_LOP_READ(16, u16, 2) RIO_LOP_READ(32, u32, 4) RIO_LOP_WRITE(8, u8, 1) RIO_LOP_WRITE(16, u16, 2) RIO_LOP_WRITE(32, u32, 4) EXPORT_SYMBOL_GPL(__rio_local_read_config_8); EXPORT_SYMBOL_GPL(__rio_local_read_config_16); EXPORT_SYMBOL_GPL(__rio_local_read_config_32); EXPORT_SYMBOL_GPL(__rio_local_write_config_8); EXPORT_SYMBOL_GPL(__rio_local_write_config_16); EXPORT_SYMBOL_GPL(__rio_local_write_config_32); /** * RIO_OP_READ - Generate rio_mport_read_config_* functions * @size: Size of configuration space read (8, 16, 32 bits) * @type: C type of value argument * @len: Length of configuration space read (1, 2, 4 bytes) * * Generates rio_mport_read_config_* functions used to access * configuration space registers on the local device. */ #define RIO_OP_READ(size,type,len) \ int rio_mport_read_config_##size \ (struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type *value) \ { \ int res; \ unsigned long flags; \ u32 data = 0; \ if (RIO_##size##_BAD) return RIO_BAD_SIZE; \ spin_lock_irqsave(&rio_config_lock, flags); \ res = mport->ops->cread(mport->id, destid, hopcount, offset, len, &data); \ *value = (type)data; \ spin_unlock_irqrestore(&rio_config_lock, flags); \ return res; \ } /** * RIO_OP_WRITE - Generate rio_mport_write_config_* functions * @size: Size of configuration space write (8, 16, 32 bits) * @type: C type of value argument * @len: Length of configuration space write (1, 2, 4 bytes) * * Generates rio_mport_write_config_* functions used to access * configuration space registers on the local device. */ #define RIO_OP_WRITE(size,type,len) \ int rio_mport_write_config_##size \ (struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type value) \ { \ int res; \ unsigned long flags; \ if (RIO_##size##_BAD) return RIO_BAD_SIZE; \ spin_lock_irqsave(&rio_config_lock, flags); \ res = mport->ops->cwrite(mport->id, destid, hopcount, offset, len, value); \ spin_unlock_irqrestore(&rio_config_lock, flags); \ return res; \ } RIO_OP_READ(8, u8, 1) RIO_OP_READ(16, u16, 2) RIO_OP_READ(32, u32, 4) RIO_OP_WRITE(8, u8, 1) RIO_OP_WRITE(16, u16, 2) RIO_OP_WRITE(32, u32, 4) EXPORT_SYMBOL_GPL(rio_mport_read_config_8); EXPORT_SYMBOL_GPL(rio_mport_read_config_16); EXPORT_SYMBOL_GPL(rio_mport_read_config_32); EXPORT_SYMBOL_GPL(rio_mport_write_config_8); EXPORT_SYMBOL_GPL(rio_mport_write_config_16); EXPORT_SYMBOL_GPL(rio_mport_write_config_32); /** * rio_mport_send_doorbell - Send a doorbell message * * @mport: RIO master port * @destid: RIO device destination ID * @data: Doorbell message data * * Send a doorbell message to a RIO device. The doorbell message * has a 16-bit info field provided by the data argument. */ int rio_mport_send_doorbell(struct rio_mport *mport, u16 destid, u16 data) { int res; unsigned long flags; spin_lock_irqsave(&rio_doorbell_lock, flags); res = mport->ops->dsend(mport->id, destid, data); spin_unlock_irqrestore(&rio_doorbell_lock, flags); return res; } EXPORT_SYMBOL_GPL(rio_mport_send_doorbell);