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/io.h>
  25
  26#include <mach/hardware.h>
  27#include <mach/netx-regs.h>
  28
  29#include <mach/xc.h>
  30
  31static DEFINE_MUTEX(xc_lock);
  32
  33static int xc_in_use = 0;
  34
  35struct fw_desc {
  36        unsigned int ofs;
  37        unsigned int size;
  38        unsigned int patch_ofs;
  39        unsigned int patch_entries;
  40};
  41
  42struct 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
  50int 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
  58int 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
  66int 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
  74int xc_reset(struct xc *x)
  75{
  76        writel(0, x->xpec_base + NETX_XPEC_PC_OFS);
  77        return 0;
  78}
  79
  80static 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
  95static 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
 112int 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
 177struct 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
 233void 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
 249EXPORT_SYMBOL(free_xc);
 250EXPORT_SYMBOL(request_xc);
 251EXPORT_SYMBOL(xc_request_firmware);
 252EXPORT_SYMBOL(xc_reset);
 253EXPORT_SYMBOL(xc_running);
 254EXPORT_SYMBOL(xc_start);
 255EXPORT_SYMBOL(xc_stop);
 256
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