arch/arm/mach-netx/xc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arm/mach-netx/xc.c
   4  *
   5  * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/device.h>
  10 #include <linux/firmware.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <linux/io.h>
  14 #include <linux/export.h>
  15
  16 #include <mach/hardware.h>
  17 #include <mach/irqs.h>
  18 #include <mach/netx-regs.h>
  19
  20 #include <mach/xc.h>
  21
  22 static DEFINE_MUTEX(xc_lock);
  23
  24 static int xc_in_use = 0;
  25
  26 struct fw_desc {
  27         unsigned int ofs;
  28         unsigned int size;
  29         unsigned int patch_ofs;
  30         unsigned int patch_entries;
  31 };
  32
  33 struct fw_header {
  34         unsigned int magic;
  35         unsigned int type;
  36         unsigned int version;
  37         unsigned int reserved[5];
  38         struct fw_desc fw_desc[3];
  39 } __attribute__ ((packed));
  40
  41 int xc_stop(struct xc *x)
  42 {
  43         writel(RPU_HOLD_PC, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
  44         writel(TPU_HOLD_PC, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
  45         writel(XPU_HOLD_PC, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
  46         return 0;
  47 }
  48
  49 int xc_start(struct xc *x)
  50 {
  51         writel(0, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
  52         writel(0, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
  53         writel(0, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
  54         return 0;
  55 }
  56
  57 int xc_running(struct xc *x)
  58 {
  59         return (readl(x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS) & RPU_HOLD_PC)
  60             || (readl(x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS) & TPU_HOLD_PC)
  61             || (readl(x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS) & XPU_HOLD_PC) ?
  62                 0 : 1;
  63 }
  64
  65 int xc_reset(struct xc *x)
  66 {
  67         writel(0, x->xpec_base + NETX_XPEC_PC_OFS);
  68         return 0;
  69 }
  70
  71 static int xc_check_ptr(struct xc *x, unsigned long adr, unsigned int size)
  72 {
  73         if (adr >= NETX_PA_XMAC(x->no) &&
  74             adr + size < NETX_PA_XMAC(x->no) + XMAC_MEM_SIZE)
  75                 return 0;
  76
  77         if (adr >= NETX_PA_XPEC(x->no) &&
  78             adr + size < NETX_PA_XPEC(x->no) + XPEC_MEM_SIZE)
  79                 return 0;
  80
  81         dev_err(x->dev, "Illegal pointer in firmware found. aborting\n");
  82
  83         return -1;
  84 }
  85
  86 static int xc_patch(struct xc *x, const void *patch, int count)
  87 {
  88         unsigned int val, adr;
  89         const unsigned int *data = patch;
  90
  91         int i;
  92         for (i = 0; i < count; i++) {
  93                 adr = *data++;
  94                 val = *data++;
  95                 if (xc_check_ptr(x, adr, 4) < 0)
  96                         return -EINVAL;
  97
  98                 writel(val, (void __iomem *)io_p2v(adr));
  99         }
 100         return 0;
 101 }
 102
 103 int xc_request_firmware(struct xc *x)
 104 {
 105         int ret;
 106         char name[16];
 107         const struct firmware *fw;
 108         struct fw_header *head;
 109         unsigned int size;
 110         int i;
 111         const void *src;
 112         unsigned long dst;
 113
 114         sprintf(name, "xc%d.bin", x->no);
 115
 116         ret = request_firmware(&fw, name, x->dev);
 117
 118         if (ret < 0) {
 119                 dev_err(x->dev, "request_firmware failed\n");
 120                 return ret;
 121         }
 122
 123         head = (struct fw_header *)fw->data;
 124         if (head->magic != 0x4e657458) {
 125                 if (head->magic == 0x5874654e) {
 126                         dev_err(x->dev,
 127                             "firmware magic is 'XteN'. Endianness problems?\n");
 128                         ret = -ENODEV;
 129                         goto exit_release_firmware;
 130                 }
 131                 dev_err(x->dev, "unrecognized firmware magic 0x%08x\n",
 132                         head->magic);
 133                 ret = -ENODEV;
 134                 goto exit_release_firmware;
 135         }
 136
 137         x->type = head->type;
 138         x->version = head->version;
 139
 140         ret = -EINVAL;
 141
 142         for (i = 0; i < 3; i++) {
 143                 src = fw->data + head->fw_desc[i].ofs;
 144                 dst = *(unsigned int *)src;
 145                 src += sizeof (unsigned int);
 146                 size = head->fw_desc[i].size - sizeof (unsigned int);
 147
 148                 if (xc_check_ptr(x, dst, size))
 149                         goto exit_release_firmware;
 150
 151                 memcpy((void *)io_p2v(dst), src, size);
 152
 153                 src = fw->data + head->fw_desc[i].patch_ofs;
 154                 size = head->fw_desc[i].patch_entries;
 155                 ret = xc_patch(x, src, size);
 156                 if (ret < 0)
 157                         goto exit_release_firmware;
 158         }
 159
 160         ret = 0;
 161
 162       exit_release_firmware:
 163         release_firmware(fw);
 164
 165         return ret;
 166 }
 167
 168 struct xc *request_xc(int xcno, struct device *dev)
 169 {
 170         struct xc *x = NULL;
 171
 172         mutex_lock(&xc_lock);
 173
 174         if (xcno > 3)
 175                 goto exit;
 176         if (xc_in_use & (1 << xcno))
 177                 goto exit;
 178
 179         x = kmalloc(sizeof (struct xc), GFP_KERNEL);
 180         if (!x)
 181                 goto exit;
 182
 183         if (!request_mem_region
 184             (NETX_PA_XPEC(xcno), XPEC_MEM_SIZE, kobject_name(&dev->kobj)))
 185                 goto exit_free;
 186
 187         if (!request_mem_region
 188             (NETX_PA_XMAC(xcno), XMAC_MEM_SIZE, kobject_name(&dev->kobj)))
 189                 goto exit_release_1;
 190
 191         if (!request_mem_region
 192             (SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE, kobject_name(&dev->kobj)))
 193                 goto exit_release_2;
 194
 195         x->xpec_base = (void * __iomem)io_p2v(NETX_PA_XPEC(xcno));
 196         x->xmac_base = (void * __iomem)io_p2v(NETX_PA_XMAC(xcno));
 197         x->sram_base = ioremap(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
 198         if (!x->sram_base)
 199                 goto exit_release_3;
 200
 201         x->irq = NETX_IRQ_XPEC(xcno);
 202
 203         x->no = xcno;
 204         x->dev = dev;
 205
 206         xc_in_use |= (1 << xcno);
 207
 208         goto exit;
 209
 210       exit_release_3:
 211         release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
 212       exit_release_2:
 213         release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
 214       exit_release_1:
 215         release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
 216       exit_free:
 217         kfree(x);
 218         x = NULL;
 219       exit:
 220         mutex_unlock(&xc_lock);
 221         return x;
 222 }
 223
 224 void free_xc(struct xc *x)
 225 {
 226         int xcno = x->no;
 227
 228         mutex_lock(&xc_lock);
 229
 230         iounmap(x->sram_base);
 231         release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
 232         release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
 233         release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
 234         xc_in_use &= ~(1 << x->no);
 235         kfree(x);
 236
 237         mutex_unlock(&xc_lock);
 238 }
 239
 240 EXPORT_SYMBOL(free_xc);
 241 EXPORT_SYMBOL(request_xc);
 242 EXPORT_SYMBOL(xc_request_firmware);
 243 EXPORT_SYMBOL(xc_reset);
 244 EXPORT_SYMBOL(xc_running);
 245 EXPORT_SYMBOL(xc_start);
 246 EXPORT_SYMBOL(xc_stop);