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