diff options
Diffstat (limited to 'libgloss/sparc_leon/amba.c')
-rw-r--r-- | libgloss/sparc_leon/amba.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/libgloss/sparc_leon/amba.c b/libgloss/sparc_leon/amba.c new file mode 100644 index 000000000..0df6759da --- /dev/null +++ b/libgloss/sparc_leon/amba.c @@ -0,0 +1,152 @@ +/* + * Copyright (c) 2011 Aeroflex Gaisler + * + * BSD license: + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + + +#include <asm-leon/leon.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +/*#define DEBUG_CONFIG*/ + +/* Structure containing address to devices found on the Amba Plug&Play bus */ +amba_confarea_type amba_conf; + +/* Pointers to Interrupt Controller configuration registers */ +volatile LEON3_IrqCtrl_Regs_Map *LEON3_IrqCtrl_Regs = 0; +volatile LEON3_GpTimer_Regs_Map *LEON3_GpTimer_Regs = 0; +unsigned long LEON3_GpTimer_Irq = 0; + +unsigned long +amba_find_apbslv_addr (unsigned long vendor, unsigned long device, + unsigned long *irq) +{ + unsigned int i, conf, iobar; + for (i = 0; i < amba_conf.apbslv.devnr; i++) + { + conf = amba_get_confword (amba_conf.apbslv, i, 0); + if ((amba_vendor (conf) == vendor) && (amba_device (conf) == device)) + { + if (irq) + { + *irq = amba_irq (conf); + } + iobar = amba_apb_get_membar (amba_conf.apbslv, i); + return amba_iobar_start (amba_conf.apbslv.apbmst[i], iobar); + } + } + return 0; +} + +#define amba_insert_device(tab, address) do { \ + if (LEON3_BYPASS_LOAD_PA(address)) { \ + (tab)->addr[(tab)->devnr] = (address); \ + (tab)->devnr ++; \ + } \ + } while(0) + +#define amba_insert_apb_device(tab, address, apbmst, idx) do { \ + if (*(address)) { \ + (tab)->addr[(tab)->devnr] = (address); \ + (tab)->apbmst[(tab)->devnr] = (apbmst); \ + (tab)->apbmstidx[(tab)->devnr] = (idx); \ + (tab)->devnr ++; \ + } \ + } while(0) + +/* + * 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. + */ + +int amba_init_done = 0; + +void +amba_init (void) +{ + unsigned int *cfg_area; /* address to configuration area */ + unsigned int mbar, conf, apbmst; + int i, j, idx = 0; + + if (amba_init_done) + { + return; + } + amba_init_done = 1; + + memset (&amba_conf, 0, sizeof (amba_conf)); + /*amba_conf.ahbmst.devnr = 0; amba_conf.ahbslv.devnr = 0; amba_conf.apbslv.devnr = 0; */ + + cfg_area = (unsigned int *) (LEON3_IO_AREA | LEON3_CONF_AREA); + + for (i = 0; i < LEON3_AHB_MASTERS; i++) + { + amba_insert_device (&amba_conf.ahbmst, cfg_area); + cfg_area += LEON3_AHB_CONF_WORDS; + } + + cfg_area = + (unsigned int *) (LEON3_IO_AREA | LEON3_CONF_AREA | + LEON3_AHB_SLAVE_CONF_AREA); + for (i = 0; i < LEON3_AHB_SLAVES; i++) + { + amba_insert_device (&amba_conf.ahbslv, cfg_area); + cfg_area += LEON3_AHB_CONF_WORDS; + } + + for (i = 0; i < amba_conf.ahbslv.devnr; i++) + { + conf = amba_get_confword (amba_conf.ahbslv, i, 0); + mbar = amba_ahb_get_membar (amba_conf.ahbslv, i, 0); + if ((amba_vendor (conf) == VENDOR_GAISLER) + && (amba_device (conf) == GAISLER_APBMST)) + { + int k; + /*amba_conf.apbmst = */ apbmst = amba_membar_start (mbar); + cfg_area = (unsigned int *) (apbmst | LEON3_CONF_AREA); + + for (j = amba_conf.apbslv.devnr, k = 0; + j < AMBA_MAXAPB_DEVS && k < AMBA_MAXAPB_DEVS_PERBUS; j++, k++) + { + amba_insert_apb_device (&amba_conf.apbslv, cfg_area, apbmst, + idx); + cfg_area += LEON3_APB_CONF_WORDS; + } + idx++; + } + } + + /* Find LEON3 Interrupt controler */ + LEON3_IrqCtrl_Regs = (volatile LEON3_IrqCtrl_Regs_Map *) + amba_find_apbslv_addr (VENDOR_GAISLER, GAISLER_IRQMP, 0); + LEON3_GpTimer_Regs = (volatile LEON3_GpTimer_Regs_Map *) + amba_find_apbslv_addr (VENDOR_GAISLER, GAISLER_GPTIMER, + &LEON3_GpTimer_Irq); + if (LEON3_IrqCtrl_Regs) + { + LEON3_BYPASS_STORE_PA (&(LEON3_IrqCtrl_Regs->mask[0]), 0); + } +} |