source: rtems/c/src/lib/libbsp/sparc/leon3/amba/amba.c @ 226d48d8

4.115
Last change on this file since 226d48d8 was 226d48d8, checked in by Daniel Hellstrom <daniel@…>, on May 16, 2012 at 3:20:35 PM

LEON: moved register definitions into grlib header file

Some register layout definitions for LEON3 reside in ambapp.h which
does not really has anything to do with device registers. The
register structures has been incorrectly named LEON3_*, the cores
are not only used on LEON3 but on LEON4 and perhaps on LEON5 when
that day comes. Some structures has been renamed according to the
GRLIB core name instead, which CPU that actually use it is not
relevant. Drivers has been updated with the new names.

Signed-off-by: Daniel Hellstrom <daniel@…>

  • Property mode set to 100644
File size: 3.0 KB
Line 
1/*
2 *  AMBA Plug & Play Bus Driver
3 *
4 *  This driver hook performs bus scanning.
5 *
6 *  COPYRIGHT (c) 2011.
7 *  Aeroflex Gaisler
8 *
9 *  The license and distribution terms for this file may be
10 *  found in the file LICENSE in this distribution or at
11 *  http://www.rtems.com/license/LICENSE.
12 */
13
14#include <bsp.h>
15#include <ambapp.h>
16
17/* AMBA Plug&Play information description.
18 *
19 * After software has scanned AMBA PnP it builds a tree to make
20 * it easier for drivers to work with the bus architecture.
21 */
22struct ambapp_bus ambapp_plb;
23
24/* GRLIB extended IRQ controller register */
25extern void leon3_ext_irq_init(void);
26
27/* Pointers to Interrupt Controller configuration registers */
28volatile struct irqmp_regs *LEON3_IrqCtrl_Regs;
29
30/*
31 *  amba_initialize
32 *
33 *  Must be called just before drivers are initialized.
34 *  Used to scan system bus. Probes for AHB masters, AHB slaves and
35 *  APB slaves. Addresses to configuration areas of the AHB masters,
36 *  AHB slaves, APB slaves and APB master are storeds in
37 *  amba_ahb_masters, amba_ahb_slaves and amba.
38 */
39
40void amba_initialize(void)
41{
42  int icsel;
43  struct ambapp_dev *adev;
44
45  /* Scan AMBA Plug&Play read-only information. The routine builds a PnP
46   * tree into ambapp_plb in RAM, after this we never access the PnP
47   * information in hardware directly any more.
48   * Since on Processor Local Bus (PLB) memory mapping is 1:1
49   */
50  ambapp_scan(&ambapp_plb, LEON3_IO_AREA, NULL, NULL);
51
52  /* Find LEON3 Interrupt controller */
53  adev = (void *)ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),
54                                 VENDOR_GAISLER, GAISLER_IRQMP,
55                                 ambapp_find_by_idx, NULL);
56  if (adev == NULL) {
57    /* PANIC IRQ controller not found!
58     *
59     *  What else can we do but stop ...
60     */
61    asm volatile( "mov 1, %g1; ta 0x0" );
62  }
63
64  LEON3_IrqCtrl_Regs = (volatile struct irqmp_regs *)DEV_TO_APB(adev)->start;
65  if ((LEON3_IrqCtrl_Regs->ampctrl >> 28) > 0) {
66    /* IRQ Controller has support for multiple IRQ Controllers, each
67     * CPU can be routed to different Controllers, we find out which
68     * controller by looking at the IRQCTRL Select Register for this CPU.
69     * Each Controller is located at a 4KByte offset.
70     */
71    icsel = LEON3_IrqCtrl_Regs->icsel[LEON3_Cpu_Index/8];
72    icsel = (icsel >> ((7 - (LEON3_Cpu_Index & 0x7)) * 4)) & 0xf;
73    LEON3_IrqCtrl_Regs += icsel;
74    LEON3_IrqCtrl_Regs->mask[LEON3_Cpu_Index] = 0;
75    LEON3_IrqCtrl_Regs->force[LEON3_Cpu_Index] = 0;
76    LEON3_IrqCtrl_Regs->iclear = 0xffffffff;
77  }
78
79  /* Init Extended IRQ controller if available */
80  leon3_ext_irq_init();
81
82  /* find GP Timer */
83  adev = (void *)ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),
84                                 VENDOR_GAISLER, GAISLER_GPTIMER,
85                                 ambapp_find_by_idx, NULL);
86  if (adev) {
87    LEON3_Timer_Regs = (volatile struct gptimer_regs *)DEV_TO_APB(adev)->start;
88
89    /* Register AMBA Bus Frequency */
90    ambapp_freq_init(&ambapp_plb, adev,
91                     (LEON3_Timer_Regs->scaler_reload + 1) * 1000000);
92  }
93}
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