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/*
* xen/arch/arm/platform_vexpress.c
*
* Versatile Express specific settings
*
* Stefano Stabellini <stefano.stabellini@eu.citrix.com>
* Copyright (c) 2013 Citrix Systems.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <asm/platforms/vexpress.h>
#include <xen/mm.h>
#define DCC_SHIFT 26
#define FUNCTION_SHIFT 20
#define SITE_SHIFT 16
#define POSITION_SHIFT 12
#define DEVICE_SHIFT 0
static inline int vexpress_ctrl_start(uint32_t *syscfg, int write,
int function, int device)
{
int dcc = 0; /* DCC to access */
int site = 0; /* motherboard */
int position = 0; /* daughterboard */
uint32_t stat;
/* set control register */
syscfg[V2M_SYS_CFGCTRL/4] = V2M_SYS_CFG_START |
(write ? V2M_SYS_CFG_WRITE : 0) |
(dcc << DCC_SHIFT) | (function << FUNCTION_SHIFT) |
(site << SITE_SHIFT) | (position << POSITION_SHIFT) |
(device << DEVICE_SHIFT);
/* wait for complete flag to be set */
do {
stat = syscfg[V2M_SYS_CFGSTAT/4];
dsb();
} while ( !(stat & V2M_SYS_CFG_COMPLETE) );
/* check error status and return error flag if set */
if ( stat & V2M_SYS_CFG_ERROR )
{
printk(KERN_ERR "V2M SYS_CFGSTAT reported a configuration error\n");
return -1;
}
return 0;
}
int vexpress_syscfg(int write, int function, int device, uint32_t *data)
{
uint32_t *syscfg = (uint32_t *) FIXMAP_ADDR(FIXMAP_MISC);
int ret = -1;
set_fixmap(FIXMAP_MISC, V2M_SYS_MMIO_BASE >> PAGE_SHIFT, DEV_SHARED);
if ( syscfg[V2M_SYS_CFGCTRL/4] & V2M_SYS_CFG_START )
goto out;
/* clear the complete bit in the V2M_SYS_CFGSTAT status register */
syscfg[V2M_SYS_CFGSTAT/4] = 0;
if ( write )
{
/* write data */
syscfg[V2M_SYS_CFGDATA/4] = *data;
if ( vexpress_ctrl_start(syscfg, write, function, device) < 0 )
goto out;
} else {
if ( vexpress_ctrl_start(syscfg, write, function, device) < 0 )
goto out;
else
/* read data */
*data = syscfg[V2M_SYS_CFGDATA/4];
}
ret = 0;
out:
clear_fixmap(FIXMAP_MISC);
return ret;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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