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Linux/arch/powerpc/sysdev/mmio_nvram.c

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  1 /*
  2  * memory mapped NVRAM
  3  *
  4  * (C) Copyright IBM Corp. 2005
  5  *
  6  * Authors : Utz Bacher <utz.bacher@de.ibm.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2, or (at your option)
 11  * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 21  */
 22 
 23 #include <linux/fs.h>
 24 #include <linux/init.h>
 25 #include <linux/kernel.h>
 26 #include <linux/spinlock.h>
 27 #include <linux/types.h>
 28 
 29 #include <asm/machdep.h>
 30 #include <asm/nvram.h>
 31 #include <asm/prom.h>
 32 
 33 static void __iomem *mmio_nvram_start;
 34 static long mmio_nvram_len;
 35 static DEFINE_SPINLOCK(mmio_nvram_lock);
 36 
 37 static ssize_t mmio_nvram_read(char *buf, size_t count, loff_t *index)
 38 {
 39         unsigned long flags;
 40 
 41         if (*index >= mmio_nvram_len)
 42                 return 0;
 43         if (*index + count > mmio_nvram_len)
 44                 count = mmio_nvram_len - *index;
 45 
 46         spin_lock_irqsave(&mmio_nvram_lock, flags);
 47 
 48         memcpy_fromio(buf, mmio_nvram_start + *index, count);
 49 
 50         spin_unlock_irqrestore(&mmio_nvram_lock, flags);
 51         
 52         *index += count;
 53         return count;
 54 }
 55 
 56 static unsigned char mmio_nvram_read_val(int addr)
 57 {
 58         unsigned long flags;
 59         unsigned char val;
 60 
 61         if (addr >= mmio_nvram_len)
 62                 return 0xff;
 63 
 64         spin_lock_irqsave(&mmio_nvram_lock, flags);
 65 
 66         val = ioread8(mmio_nvram_start + addr);
 67 
 68         spin_unlock_irqrestore(&mmio_nvram_lock, flags);
 69 
 70         return val;
 71 }
 72 
 73 static ssize_t mmio_nvram_write(char *buf, size_t count, loff_t *index)
 74 {
 75         unsigned long flags;
 76 
 77         if (*index >= mmio_nvram_len)
 78                 return 0;
 79         if (*index + count > mmio_nvram_len)
 80                 count = mmio_nvram_len - *index;
 81 
 82         spin_lock_irqsave(&mmio_nvram_lock, flags);
 83 
 84         memcpy_toio(mmio_nvram_start + *index, buf, count);
 85 
 86         spin_unlock_irqrestore(&mmio_nvram_lock, flags);
 87         
 88         *index += count;
 89         return count;
 90 }
 91 
 92 void mmio_nvram_write_val(int addr, unsigned char val)
 93 {
 94         unsigned long flags;
 95 
 96         if (addr < mmio_nvram_len) {
 97                 spin_lock_irqsave(&mmio_nvram_lock, flags);
 98 
 99                 iowrite8(val, mmio_nvram_start + addr);
100 
101                 spin_unlock_irqrestore(&mmio_nvram_lock, flags);
102         }
103 }
104 
105 static ssize_t mmio_nvram_get_size(void)
106 {
107         return mmio_nvram_len;
108 }
109 
110 int __init mmio_nvram_init(void)
111 {
112         struct device_node *nvram_node;
113         unsigned long nvram_addr;
114         struct resource r;
115         int ret;
116 
117         nvram_node = of_find_node_by_type(NULL, "nvram");
118         if (!nvram_node)
119                 nvram_node = of_find_compatible_node(NULL, NULL, "nvram");
120         if (!nvram_node) {
121                 printk(KERN_WARNING "nvram: no node found in device-tree\n");
122                 return -ENODEV;
123         }
124 
125         ret = of_address_to_resource(nvram_node, 0, &r);
126         if (ret) {
127                 printk(KERN_WARNING "nvram: failed to get address (err %d)\n",
128                        ret);
129                 goto out;
130         }
131         nvram_addr = r.start;
132         mmio_nvram_len = resource_size(&r);
133         if ( (!mmio_nvram_len) || (!nvram_addr) ) {
134                 printk(KERN_WARNING "nvram: address or length is 0\n");
135                 ret = -EIO;
136                 goto out;
137         }
138 
139         mmio_nvram_start = ioremap(nvram_addr, mmio_nvram_len);
140         if (!mmio_nvram_start) {
141                 printk(KERN_WARNING "nvram: failed to ioremap\n");
142                 ret = -ENOMEM;
143                 goto out;
144         }
145 
146         printk(KERN_INFO "mmio NVRAM, %luk at 0x%lx mapped to %p\n",
147                mmio_nvram_len >> 10, nvram_addr, mmio_nvram_start);
148 
149         ppc_md.nvram_read_val   = mmio_nvram_read_val;
150         ppc_md.nvram_write_val  = mmio_nvram_write_val;
151         ppc_md.nvram_read       = mmio_nvram_read;
152         ppc_md.nvram_write      = mmio_nvram_write;
153         ppc_md.nvram_size       = mmio_nvram_get_size;
154 
155 out:
156         of_node_put(nvram_node);
157         return ret;
158 }
159 

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