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Linux/arch/powerpc/platforms/40x/ep405.c

  1 /*
  2  * Architecture- / platform-specific boot-time initialization code for
  3  * IBM PowerPC 4xx based boards. Adapted from original
  4  * code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
  5  * <dan@net4x.com>.
  6  *
  7  * Copyright(c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
  8  *
  9  * Rewritten and ported to the merged powerpc tree:
 10  * Copyright 2007 IBM Corporation
 11  * Josh Boyer <jwboyer@linux.vnet.ibm.com>
 12  *
 13  * Adapted to EP405 by Ben. Herrenschmidt <benh@kernel.crashing.org>
 14  *
 15  * TODO: Wire up the PCI IRQ mux and the southbridge interrupts
 16  *
 17  * 2002 (c) MontaVista, Software, Inc.  This file is licensed under
 18  * the terms of the GNU General Public License version 2.  This program
 19  * is licensed "as is" without any warranty of any kind, whether express
 20  * or implied.
 21  */
 22 
 23 #include <linux/init.h>
 24 #include <linux/of_platform.h>
 25 
 26 #include <asm/machdep.h>
 27 #include <asm/prom.h>
 28 #include <asm/udbg.h>
 29 #include <asm/time.h>
 30 #include <asm/uic.h>
 31 #include <asm/pci-bridge.h>
 32 #include <asm/ppc4xx.h>
 33 
 34 static struct device_node *bcsr_node;
 35 static void __iomem *bcsr_regs;
 36 
 37 /* BCSR registers  */
 38 #define BCSR_ID                 0
 39 #define BCSR_PCI_CTRL           1
 40 #define BCSR_FLASH_NV_POR_CTRL  2
 41 #define BCSR_FENET_UART_CTRL    3
 42 #define BCSR_PCI_IRQ            4
 43 #define BCSR_XIRQ_SELECT        5
 44 #define BCSR_XIRQ_ROUTING       6
 45 #define BCSR_XIRQ_STATUS        7
 46 #define BCSR_XIRQ_STATUS2       8
 47 #define BCSR_SW_STAT_LED_CTRL   9
 48 #define BCSR_GPIO_IRQ_PAR_CTRL  10
 49 /* there's more, can't be bothered typing them tho */
 50 
 51 
 52 static const struct of_device_id ep405_of_bus[] __initconst = {
 53         { .compatible = "ibm,plb3", },
 54         { .compatible = "ibm,opb", },
 55         { .compatible = "ibm,ebc", },
 56         {},
 57 };
 58 
 59 static int __init ep405_device_probe(void)
 60 {
 61         of_platform_bus_probe(NULL, ep405_of_bus, NULL);
 62 
 63         return 0;
 64 }
 65 machine_device_initcall(ep405, ep405_device_probe);
 66 
 67 static void __init ep405_init_bcsr(void)
 68 {
 69         const u8 *irq_routing;
 70         int i;
 71 
 72         /* Find the bloody thing & map it */
 73         bcsr_node = of_find_compatible_node(NULL, NULL, "ep405-bcsr");
 74         if (bcsr_node == NULL) {
 75                 printk(KERN_ERR "EP405 BCSR not found !\n");
 76                 return;
 77         }
 78         bcsr_regs = of_iomap(bcsr_node, 0);
 79         if (bcsr_regs == NULL) {
 80                 printk(KERN_ERR "EP405 BCSR failed to map !\n");
 81                 return;
 82         }
 83 
 84         /* Get the irq-routing property and apply the routing to the CPLD */
 85         irq_routing = of_get_property(bcsr_node, "irq-routing", NULL);
 86         if (irq_routing == NULL)
 87                 return;
 88         for (i = 0; i < 16; i++) {
 89                 u8 irq = irq_routing[i];
 90                 out_8(bcsr_regs + BCSR_XIRQ_SELECT, i);
 91                 out_8(bcsr_regs + BCSR_XIRQ_ROUTING, irq);
 92         }
 93         in_8(bcsr_regs + BCSR_XIRQ_SELECT);
 94         mb();
 95         out_8(bcsr_regs + BCSR_GPIO_IRQ_PAR_CTRL, 0xfe);
 96 }
 97 
 98 static void __init ep405_setup_arch(void)
 99 {
100         /* Find & init the BCSR CPLD */
101         ep405_init_bcsr();
102 
103         pci_set_flags(PCI_REASSIGN_ALL_RSRC);
104 }
105 
106 static int __init ep405_probe(void)
107 {
108         unsigned long root = of_get_flat_dt_root();
109 
110         if (!of_flat_dt_is_compatible(root, "ep405"))
111                 return 0;
112 
113         return 1;
114 }
115 
116 define_machine(ep405) {
117         .name                   = "EP405",
118         .probe                  = ep405_probe,
119         .setup_arch             = ep405_setup_arch,
120         .progress               = udbg_progress,
121         .init_IRQ               = uic_init_tree,
122         .get_irq                = uic_get_irq,
123         .restart                = ppc4xx_reset_system,
124         .calibrate_decr         = generic_calibrate_decr,
125 };
126 

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