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Linux/arch/powerpc/platforms/44x/canyonlands.c

  1 /*
  2  * This contain platform specific code for APM PPC460EX based Canyonlands
  3  * board.
  4  *
  5  * Copyright (c) 2010, Applied Micro Circuits Corporation
  6  * Author: Rupjyoti Sarmah <rsarmah@apm.com>
  7  *
  8  * This program is free software; you can redistribute it and/or
  9  * modify it under the terms of the GNU General Public License as
 10  * published by the Free Software Foundation; either version 2 of
 11  * the License, or (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 21  * MA 02111-1307 USA
 22  *
 23  */
 24 #include <linux/kernel.h>
 25 #include <linux/init.h>
 26 #include <asm/pci-bridge.h>
 27 #include <asm/ppc4xx.h>
 28 #include <asm/udbg.h>
 29 #include <asm/uic.h>
 30 #include <linux/of_platform.h>
 31 #include <linux/delay.h>
 32 #include "44x.h"
 33 
 34 #define BCSR_USB_EN     0x11
 35 
 36 static __initdata struct of_device_id ppc460ex_of_bus[] = {
 37         { .compatible = "ibm,plb4", },
 38         { .compatible = "ibm,opb", },
 39         { .compatible = "ibm,ebc", },
 40         { .compatible = "simple-bus", },
 41         {},
 42 };
 43 
 44 static int __init ppc460ex_device_probe(void)
 45 {
 46         of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
 47 
 48         return 0;
 49 }
 50 machine_device_initcall(canyonlands, ppc460ex_device_probe);
 51 
 52 /* Using this code only for the Canyonlands board.  */
 53 
 54 static int __init ppc460ex_probe(void)
 55 {
 56         unsigned long root = of_get_flat_dt_root();
 57         if (of_flat_dt_is_compatible(root, "amcc,canyonlands")) {
 58                 pci_set_flags(PCI_REASSIGN_ALL_RSRC);
 59                 return 1;
 60                 }
 61         return 0;
 62 }
 63 
 64 /* USB PHY fixup code on Canyonlands kit. */
 65 
 66 static int __init ppc460ex_canyonlands_fixup(void)
 67 {
 68         u8 __iomem *bcsr ;
 69         void __iomem *vaddr;
 70         struct device_node *np;
 71         int ret = 0;
 72 
 73         np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
 74         if (!np) {
 75                 printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
 76                 return -ENODEV;
 77         }
 78 
 79         bcsr = of_iomap(np, 0);
 80         of_node_put(np);
 81 
 82         if (!bcsr) {
 83                 printk(KERN_CRIT "Could not remap bcsr\n");
 84                 ret = -ENODEV;
 85                 goto err_bcsr;
 86         }
 87 
 88         np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
 89         if (!np) {
 90                 printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
 91                 return -ENODEV;
 92         }
 93 
 94         vaddr = of_iomap(np, 0);
 95         of_node_put(np);
 96 
 97         if (!vaddr) {
 98                 printk(KERN_CRIT "Could not get gpio node address\n");
 99                 ret = -ENODEV;
100                 goto err_gpio;
101         }
102         /* Disable USB, through the BCSR7 bits */
103         setbits8(&bcsr[7], BCSR_USB_EN);
104 
105         /* Wait for a while after reset */
106         msleep(100);
107 
108         /* Enable USB here */
109         clrbits8(&bcsr[7], BCSR_USB_EN);
110 
111         /*
112          * Configure multiplexed gpio16 and gpio19 as alternate1 output
113          * source after USB reset. In this configuration gpio16 will be
114          * USB2HStop and gpio19 will be USB2DStop. For more details refer to
115          * table 34-7 of PPC460EX user manual.
116          */
117         setbits32((vaddr + GPIO0_OSRH), 0x42000000);
118         setbits32((vaddr + GPIO0_TSRH), 0x42000000);
119 err_gpio:
120         iounmap(vaddr);
121 err_bcsr:
122         iounmap(bcsr);
123         return ret;
124 }
125 machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
126 define_machine(canyonlands) {
127         .name = "Canyonlands",
128         .probe = ppc460ex_probe,
129         .progress = udbg_progress,
130         .init_IRQ = uic_init_tree,
131         .get_irq = uic_get_irq,
132         .restart = ppc4xx_reset_system,
133         .calibrate_decr = generic_calibrate_decr,
134 };
135 

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