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Linux/arch/arm/mach-netx/xc.c

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  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 #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 {
 55         writel(RPU_HOLD_PC, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
 56         writel(TPU_HOLD_PC, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
 57         writel(XPU_HOLD_PC, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
 58         return 0;
 59 }
 60 
 61 int xc_start(struct xc *x)
 62 {
 63         writel(0, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
 64         writel(0, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
 65         writel(0, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
 66         return 0;
 67 }
 68 
 69 int xc_running(struct xc *x)
 70 {
 71         return (readl(x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS) & RPU_HOLD_PC)
 72             || (readl(x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS) & TPU_HOLD_PC)
 73             || (readl(x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS) & XPU_HOLD_PC) ?
 74                 0 : 1;
 75 }
 76 
 77 int xc_reset(struct xc *x)
 78 {
 79         writel(0, x->xpec_base + NETX_XPEC_PC_OFS);
 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'. Endianness 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));
209         x->sram_base = ioremap(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
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:
223         release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
224       exit_release_2:
225         release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
226       exit_release_1:
227         release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
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);
243         release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
244         release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
245         release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
246         xc_in_use &= ~(1 << x->no);
247         kfree(x);
248 
249         mutex_unlock(&xc_lock);
250 }
251 
252 EXPORT_SYMBOL(free_xc);
253 EXPORT_SYMBOL(request_xc);
254 EXPORT_SYMBOL(xc_request_firmware);
255 EXPORT_SYMBOL(xc_reset);
256 EXPORT_SYMBOL(xc_running);
257 EXPORT_SYMBOL(xc_start);
258 EXPORT_SYMBOL(xc_stop);
259 

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