Linux Kernel  3.7.1
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xc.c
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1 /*
2  * arch/arm/mach-netx/xc.c
3  *
4  * Copyright (c) 2005 Sascha Hauer <[email protected]>, Pengutronix
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19 
20 #include <linux/init.h>
21 #include <linux/device.h>
22 #include <linux/firmware.h>
23 #include <linux/mutex.h>
24 #include <linux/slab.h>
25 #include <linux/io.h>
26 #include <linux/export.h>
27 
28 #include <mach/hardware.h>
29 #include <mach/irqs.h>
30 #include <mach/netx-regs.h>
31 
32 #include <mach/xc.h>
33 
34 static DEFINE_MUTEX(xc_lock);
35 
36 static int xc_in_use = 0;
37 
38 struct fw_desc {
39  unsigned int ofs;
40  unsigned int size;
41  unsigned int patch_ofs;
42  unsigned int patch_entries;
43 };
44 
45 struct fw_header {
46  unsigned int magic;
47  unsigned int type;
48  unsigned int version;
49  unsigned int reserved[5];
50  struct fw_desc fw_desc[3];
51 } __attribute__ ((packed));
52 
53 int xc_stop(struct xc *x)
54 {
58  return 0;
59 }
60 
61 int xc_start(struct xc *x)
62 {
66  return 0;
67 }
68 
69 int xc_running(struct xc *x)
70 {
74  0 : 1;
75 }
76 
77 int xc_reset(struct xc *x)
78 {
80  return 0;
81 }
82 
83 static int xc_check_ptr(struct xc *x, unsigned long adr, unsigned int size)
84 {
85  if (adr >= NETX_PA_XMAC(x->no) &&
86  adr + size < NETX_PA_XMAC(x->no) + XMAC_MEM_SIZE)
87  return 0;
88 
89  if (adr >= NETX_PA_XPEC(x->no) &&
90  adr + size < NETX_PA_XPEC(x->no) + XPEC_MEM_SIZE)
91  return 0;
92 
93  dev_err(x->dev, "Illegal pointer in firmware found. aborting\n");
94 
95  return -1;
96 }
97 
98 static int xc_patch(struct xc *x, const void *patch, int count)
99 {
100  unsigned int val, adr;
101  const unsigned int *data = patch;
102 
103  int i;
104  for (i = 0; i < count; i++) {
105  adr = *data++;
106  val = *data++;
107  if (xc_check_ptr(x, adr, 4) < 0)
108  return -EINVAL;
109 
110  writel(val, (void __iomem *)io_p2v(adr));
111  }
112  return 0;
113 }
114 
115 int xc_request_firmware(struct xc *x)
116 {
117  int ret;
118  char name[16];
119  const struct firmware *fw;
120  struct fw_header *head;
121  unsigned int size;
122  int i;
123  const void *src;
124  unsigned long dst;
125 
126  sprintf(name, "xc%d.bin", x->no);
127 
128  ret = request_firmware(&fw, name, x->dev);
129 
130  if (ret < 0) {
131  dev_err(x->dev, "request_firmware failed\n");
132  return ret;
133  }
134 
135  head = (struct fw_header *)fw->data;
136  if (head->magic != 0x4e657458) {
137  if (head->magic == 0x5874654e) {
138  dev_err(x->dev,
139  "firmware magic is 'XteN'. Endianess problems?\n");
140  ret = -ENODEV;
141  goto exit_release_firmware;
142  }
143  dev_err(x->dev, "unrecognized firmware magic 0x%08x\n",
144  head->magic);
145  ret = -ENODEV;
146  goto exit_release_firmware;
147  }
148 
149  x->type = head->type;
150  x->version = head->version;
151 
152  ret = -EINVAL;
153 
154  for (i = 0; i < 3; i++) {
155  src = fw->data + head->fw_desc[i].ofs;
156  dst = *(unsigned int *)src;
157  src += sizeof (unsigned int);
158  size = head->fw_desc[i].size - sizeof (unsigned int);
159 
160  if (xc_check_ptr(x, dst, size))
161  goto exit_release_firmware;
162 
163  memcpy((void *)io_p2v(dst), src, size);
164 
165  src = fw->data + head->fw_desc[i].patch_ofs;
166  size = head->fw_desc[i].patch_entries;
167  ret = xc_patch(x, src, size);
168  if (ret < 0)
169  goto exit_release_firmware;
170  }
171 
172  ret = 0;
173 
174  exit_release_firmware:
175  release_firmware(fw);
176 
177  return ret;
178 }
179 
180 struct xc *request_xc(int xcno, struct device *dev)
181 {
182  struct xc *x = NULL;
183 
184  mutex_lock(&xc_lock);
185 
186  if (xcno > 3)
187  goto exit;
188  if (xc_in_use & (1 << xcno))
189  goto exit;
190 
191  x = kmalloc(sizeof (struct xc), GFP_KERNEL);
192  if (!x)
193  goto exit;
194 
195  if (!request_mem_region
196  (NETX_PA_XPEC(xcno), XPEC_MEM_SIZE, kobject_name(&dev->kobj)))
197  goto exit_free;
198 
199  if (!request_mem_region
200  (NETX_PA_XMAC(xcno), XMAC_MEM_SIZE, kobject_name(&dev->kobj)))
201  goto exit_release_1;
202 
203  if (!request_mem_region
204  (SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE, kobject_name(&dev->kobj)))
205  goto exit_release_2;
206 
207  x->xpec_base = (void * __iomem)io_p2v(NETX_PA_XPEC(xcno));
208  x->xmac_base = (void * __iomem)io_p2v(NETX_PA_XMAC(xcno));
210  if (!x->sram_base)
211  goto exit_release_3;
212 
213  x->irq = NETX_IRQ_XPEC(xcno);
214 
215  x->no = xcno;
216  x->dev = dev;
217 
218  xc_in_use |= (1 << xcno);
219 
220  goto exit;
221 
222  exit_release_3:
224  exit_release_2:
226  exit_release_1:
228  exit_free:
229  kfree(x);
230  x = NULL;
231  exit:
232  mutex_unlock(&xc_lock);
233  return x;
234 }
235 
236 void free_xc(struct xc *x)
237 {
238  int xcno = x->no;
239 
240  mutex_lock(&xc_lock);
241 
242  iounmap(x->sram_base);
246  xc_in_use &= ~(1 << x->no);
247  kfree(x);
248 
249  mutex_unlock(&xc_lock);
250 }
251