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[linux-2.6] / arch / arm / mach-netx / xc.c
1 /*
2  * arch/arm/mach-netx/xc.c
3  *
4  * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, 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
25 #include <asm/io.h>
26 #include <asm/hardware.h>
27 #include <asm/arch/netx-regs.h>
28
29 #include <asm/arch/xc.h>
30
31 static DEFINE_MUTEX(xc_lock);
32
33 static int xc_in_use = 0;
34
35 struct fw_desc {
36         unsigned int ofs;
37         unsigned int size;
38         unsigned int patch_ofs;
39         unsigned int patch_entries;
40 };
41
42 struct fw_header {
43         unsigned int magic;
44         unsigned int type;
45         unsigned int version;
46         unsigned int reserved[5];
47         struct fw_desc fw_desc[3];
48 } __attribute__ ((packed));
49
50 int xc_stop(struct xc *x)
51 {
52         writel(RPU_HOLD_PC, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
53         writel(TPU_HOLD_PC, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
54         writel(XPU_HOLD_PC, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
55         return 0;
56 }
57
58 int xc_start(struct xc *x)
59 {
60         writel(0, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
61         writel(0, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
62         writel(0, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
63         return 0;
64 }
65
66 int xc_running(struct xc *x)
67 {
68         return (readl(x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS) & RPU_HOLD_PC)
69             || (readl(x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS) & TPU_HOLD_PC)
70             || (readl(x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS) & XPU_HOLD_PC) ?
71                 0 : 1;
72 }
73
74 int xc_reset(struct xc *x)
75 {
76         writel(0, x->xpec_base + NETX_XPEC_PC_OFS);
77         return 0;
78 }
79
80 static int xc_check_ptr(struct xc *x, unsigned long adr, unsigned int size)
81 {
82         if (adr >= NETX_PA_XMAC(x->no) &&
83             adr + size < NETX_PA_XMAC(x->no) + XMAC_MEM_SIZE)
84                 return 0;
85
86         if (adr >= NETX_PA_XPEC(x->no) &&
87             adr + size < NETX_PA_XPEC(x->no) + XPEC_MEM_SIZE)
88                 return 0;
89
90         dev_err(x->dev, "Illegal pointer in firmware found. aborting\n");
91
92         return -1;
93 }
94
95 static int xc_patch(struct xc *x, void *patch, int count)
96 {
97         unsigned int val, adr;
98         unsigned int *data = patch;
99
100         int i;
101         for (i = 0; i < count; i++) {
102                 adr = *data++;
103                 val = *data++;
104                 if (xc_check_ptr(x, adr, 4) < 0)
105                         return -EINVAL;
106
107                 writel(val, (void __iomem *)io_p2v(adr));
108         }
109         return 0;
110 }
111
112 int xc_request_firmware(struct xc *x)
113 {
114         int ret;
115         char name[16];
116         const struct firmware *fw;
117         struct fw_header *head;
118         unsigned int size;
119         int i;
120         void *src;
121         unsigned long dst;
122
123         sprintf(name, "xc%d.bin", x->no);
124
125         ret = request_firmware(&fw, name, x->dev);
126
127         if (ret < 0) {
128                 dev_err(x->dev, "request_firmware failed\n");
129                 return ret;
130         }
131
132         head = (struct fw_header *)fw->data;
133         if (head->magic != 0x4e657458) {
134                 if (head->magic == 0x5874654e) {
135                         dev_err(x->dev,
136                             "firmware magic is 'XteN'. Endianess problems?\n");
137                         ret = -ENODEV;
138                         goto exit_release_firmware;
139                 }
140                 dev_err(x->dev, "unrecognized firmware magic 0x%08x\n",
141                         head->magic);
142                 ret = -ENODEV;
143                 goto exit_release_firmware;
144         }
145
146         x->type = head->type;
147         x->version = head->version;
148
149         ret = -EINVAL;
150
151         for (i = 0; i < 3; i++) {
152                 src = fw->data + head->fw_desc[i].ofs;
153                 dst = *(unsigned int *)src;
154                 src += sizeof (unsigned int);
155                 size = head->fw_desc[i].size - sizeof (unsigned int);
156
157                 if (xc_check_ptr(x, dst, size))
158                         goto exit_release_firmware;
159
160                 memcpy((void *)io_p2v(dst), src, size);
161
162                 src = fw->data + head->fw_desc[i].patch_ofs;
163                 size = head->fw_desc[i].patch_entries;
164                 ret = xc_patch(x, src, size);
165                 if (ret < 0)
166                         goto exit_release_firmware;
167         }
168
169         ret = 0;
170
171       exit_release_firmware:
172         release_firmware(fw);
173
174         return ret;
175 }
176
177 struct xc *request_xc(int xcno, struct device *dev)
178 {
179         struct xc *x = NULL;
180
181         mutex_lock(&xc_lock);
182
183         if (xcno > 3)
184                 goto exit;
185         if (xc_in_use & (1 << xcno))
186                 goto exit;
187
188         x = kmalloc(sizeof (struct xc), GFP_KERNEL);
189         if (!x)
190                 goto exit;
191
192         if (!request_mem_region
193             (NETX_PA_XPEC(xcno), XPEC_MEM_SIZE, kobject_name(&dev->kobj)))
194                 goto exit_free;
195
196         if (!request_mem_region
197             (NETX_PA_XMAC(xcno), XMAC_MEM_SIZE, kobject_name(&dev->kobj)))
198                 goto exit_release_1;
199
200         if (!request_mem_region
201             (SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE, kobject_name(&dev->kobj)))
202                 goto exit_release_2;
203
204         x->xpec_base = (void * __iomem)io_p2v(NETX_PA_XPEC(xcno));
205         x->xmac_base = (void * __iomem)io_p2v(NETX_PA_XMAC(xcno));
206         x->sram_base = ioremap(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
207         if (!x->sram_base)
208                 goto exit_release_3;
209
210         x->irq = NETX_IRQ_XPEC(xcno);
211
212         x->no = xcno;
213         x->dev = dev;
214
215         xc_in_use |= (1 << xcno);
216
217         goto exit;
218
219       exit_release_3:
220         release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
221       exit_release_2:
222         release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
223       exit_release_1:
224         release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
225       exit_free:
226         kfree(x);
227         x = NULL;
228       exit:
229         mutex_unlock(&xc_lock);
230         return x;
231 }
232
233 void free_xc(struct xc *x)
234 {
235         int xcno = x->no;
236
237         mutex_lock(&xc_lock);
238
239         iounmap(x->sram_base);
240         release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
241         release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
242         release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
243         xc_in_use &= ~(1 << x->no);
244         kfree(x);
245
246         mutex_unlock(&xc_lock);
247 }
248
249 EXPORT_SYMBOL(free_xc);
250 EXPORT_SYMBOL(request_xc);
251 EXPORT_SYMBOL(xc_request_firmware);
252 EXPORT_SYMBOL(xc_reset);
253 EXPORT_SYMBOL(xc_running);
254 EXPORT_SYMBOL(xc_start);
255 EXPORT_SYMBOL(xc_stop);