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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* AMBA Plug & Play Bus Driver
*
* This driver hook performs bus scanning.
*
* COPYRIGHT (c) 2011.
* Aeroflex Gaisler
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <bsp.h>
#include <bsp/fatal.h>
#include <leon.h>
#include <grlib/ambapp.h>
#include <rtems/score/memory.h>
#include <rtems/sysinit.h>
#include <string.h>
#if !defined(LEON3_GPTIMER_BASE)
unsigned int leon3_timer_prescaler __attribute__((weak)) = 0;
int leon3_timer_core_index __attribute__((weak)) = 0;
#endif
/* AMBA Plug&Play information description.
*
* After software has scanned AMBA PnP it builds a tree to make
* it easier for drivers to work with the bus architecture.
*/
static struct ambapp_bus ambapp_plb_instance;
static void *ambapp_plb_alloc( size_t size )
{
return _Memory_Allocate( _Memory_Get(), size, CPU_HEAP_ALIGNMENT );
}
struct ambapp_bus *ambapp_plb( void )
{
struct ambapp_bus *plb;
plb = &ambapp_plb_instance;
if ( plb->root == NULL ) {
struct ambapp_context ctx;
ctx.copy_from_device = (ambapp_memcpy_t) memcpy;
ctx.alloc = ambapp_plb_alloc;
/* Scan AMBA Plug&Play read-only information. The routine builds a PnP
* tree into ambapp_plb in RAM, after this we never access the PnP
* information in hardware directly any more.
* Since on Processor Local Bus (PLB) memory mapping is 1:1
*/
ambapp_scan( plb, LEON3_IO_AREA, &ctx, NULL );
}
return plb;
}
/* If RTEMS_DRVMGR_STARTUP is defined extra code is added that
* registers the GRLIB AMBA PnP bus driver as root driver.
*/
#ifdef RTEMS_DRVMGR_STARTUP
#include <drvmgr/drvmgr.h>
#include <grlib/ambapp_bus_grlib.h>
/* Driver resources configuration for AMBA root bus. It is declared weak
* so that the user may override it, if the defualt settings are not
* enough.
*/
struct drvmgr_bus_res grlib_drv_resources __attribute__((weak)) =
{
.next = NULL,
.resource =
{
DRVMGR_RES_EMPTY,
}
};
/* GRLIB AMBA bus configuration (the LEON3 root bus configuration) */
struct grlib_config grlib_bus_config;
static void ambapp_grlib_root_initialize( void )
{
/* Register Root bus, Use GRLIB AMBA PnP bus as root bus for LEON3 */
grlib_bus_config.abus = ambapp_plb();
grlib_bus_config.resources = &grlib_drv_resources;
ambapp_grlib_root_register(&grlib_bus_config);
}
RTEMS_SYSINIT_ITEM(
ambapp_grlib_root_initialize,
RTEMS_SYSINIT_BSP_START,
RTEMS_SYSINIT_ORDER_SECOND
);
#endif
#if !defined(LEON3_IRQAMP_BASE)
irqamp *LEON3_IrqCtrl_Regs;
struct ambapp_dev *LEON3_IrqCtrl_Adev;
#endif
#if !defined(LEON3_GPTIMER_BASE)
gptimer *LEON3_Timer_Regs;
struct ambapp_dev *LEON3_Timer_Adev;
#endif
/*
* amba_initialize
*
* Must be called just before drivers are initialized.
* Used to scan system bus. Probes for AHB masters, AHB slaves and
* APB slaves. Addresses to configuration areas of the AHB masters,
* AHB slaves, APB slaves and APB master are storeds in
* amba_ahb_masters, amba_ahb_slaves and amba.
*/
static void amba_initialize(void)
{
struct ambapp_dev *adev;
struct ambapp_bus *plb;
plb = ambapp_plb();
#if defined(LEON3_IRQAMP_BASE) && defined(LEON3_GPTIMER_BASE)
(void) plb;
(void) adev;
#endif
#if !defined(LEON3_IRQAMP_BASE)
/* Find LEON3 Interrupt controller */
adev = (void *)ambapp_for_each(plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),
VENDOR_GAISLER, GAISLER_IRQMP,
ambapp_find_by_idx, NULL);
if (adev == NULL) {
/* PANIC IRQ controller not found!
*
* What else can we do but stop ...
*/
bsp_fatal(LEON3_FATAL_NO_IRQMP_CONTROLLER);
}
LEON3_IrqCtrl_Regs = (irqamp *)DEV_TO_APB(adev)->start;
LEON3_IrqCtrl_Adev = adev;
if ((grlib_load_32(&LEON3_IrqCtrl_Regs->asmpctrl) >> 28) > 0) {
uint32_t icsel;
/* IRQ Controller has support for multiple IRQ Controllers, each
* CPU can be routed to different Controllers, we find out which
* controller by looking at the IRQCTRL Select Register for this CPU.
* Each Controller is located at a 4KByte offset.
*/
icsel = grlib_load_32(&LEON3_IrqCtrl_Regs->icselr[LEON3_Cpu_Index/8]);
icsel = (icsel >> ((7 - (LEON3_Cpu_Index & 0x7)) * 4)) & 0xf;
LEON3_IrqCtrl_Regs += icsel;
}
#endif
#if !defined(LEON3_GPTIMER_BASE)
/* find GP Timer */
adev = (void *)ambapp_for_each(plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),
VENDOR_GAISLER, GAISLER_GPTIMER,
ambapp_find_by_idx, &leon3_timer_core_index);
if (adev) {
LEON3_Timer_Regs = (gptimer *)DEV_TO_APB(adev)->start;
LEON3_Timer_Adev = adev;
/* Register AMBA Bus Frequency */
ambapp_freq_init(
plb,
LEON3_Timer_Adev,
(grlib_load_32(&LEON3_Timer_Regs->sreload) + 1)
* LEON3_GPTIMER_0_FREQUENCY_SET_BY_BOOT_LOADER
);
/* Set user prescaler configuration. Use this to increase accuracy of timer
* and accociated services like cpucounter.
* Note that minimum value is the number of timer instances present in
* GRTIMER/GPTIMER hardware. See HW manual.
*/
if (leon3_timer_prescaler)
grlib_store_32(&LEON3_Timer_Regs->sreload, leon3_timer_prescaler);
}
#endif
}
RTEMS_SYSINIT_ITEM(
amba_initialize,
RTEMS_SYSINIT_BSP_EARLY,
RTEMS_SYSINIT_ORDER_MIDDLE
);
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