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