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 #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);