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 #include <linux/io.h>
  25
  26 #include <mach/hardware.h>
  27 #include <mach/netx-regs.h>
  28
  29 #include <mach/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);