drivers/soc/fsl/qbman/bman_ccsr.c

   1 /* Copyright (c) 2009 - 2016 Freescale Semiconductor, Inc.
   2  *
   3  * Redistribution and use in source and binary forms, with or without
   4  * modification, are permitted provided that the following conditions are met:
   5  *     * Redistributions of source code must retain the above copyright
   6  *       notice, this list of conditions and the following disclaimer.
   7  *     * Redistributions in binary form must reproduce the above copyright
   8  *       notice, this list of conditions and the following disclaimer in the
   9  *       documentation and/or other materials provided with the distribution.
  10  *     * Neither the name of Freescale Semiconductor nor the
  11  *       names of its contributors may be used to endorse or promote products
  12  *       derived from this software without specific prior written permission.
  13  *
  14  * ALTERNATIVELY, this software may be distributed under the terms of the
  15  * GNU General Public License ("GPL") as published by the Free Software
  16  * Foundation, either version 2 of that License or (at your option) any
  17  * later version.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
  20  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
  23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "bman_priv.h"
  32
  33 u16 bman_ip_rev;
  34 EXPORT_SYMBOL(bman_ip_rev);
  35
  36 /* Register offsets */
  37 #define REG_FBPR_FPC            0x0800
  38 #define REG_ECSR                0x0a00
  39 #define REG_ECIR                0x0a04
  40 #define REG_EADR                0x0a08
  41 #define REG_EDATA(n)            (0x0a10 + ((n) * 0x04))
  42 #define REG_SBEC(n)             (0x0a80 + ((n) * 0x04))
  43 #define REG_IP_REV_1            0x0bf8
  44 #define REG_IP_REV_2            0x0bfc
  45 #define REG_FBPR_BARE           0x0c00
  46 #define REG_FBPR_BAR            0x0c04
  47 #define REG_FBPR_AR             0x0c10
  48 #define REG_SRCIDR              0x0d04
  49 #define REG_LIODNR              0x0d08
  50 #define REG_ERR_ISR             0x0e00
  51 #define REG_ERR_IER             0x0e04
  52 #define REG_ERR_ISDR            0x0e08
  53
  54 /* Used by all error interrupt registers except 'inhibit' */
  55 #define BM_EIRQ_IVCI    0x00000010      /* Invalid Command Verb */
  56 #define BM_EIRQ_FLWI    0x00000008      /* FBPR Low Watermark */
  57 #define BM_EIRQ_MBEI    0x00000004      /* Multi-bit ECC Error */
  58 #define BM_EIRQ_SBEI    0x00000002      /* Single-bit ECC Error */
  59 #define BM_EIRQ_BSCN    0x00000001      /* pool State Change Notification */
  60
  61 struct bman_hwerr_txt {
  62         u32 mask;
  63         const char *txt;
  64 };
  65
  66 static const struct bman_hwerr_txt bman_hwerr_txts[] = {
  67         { BM_EIRQ_IVCI, "Invalid Command Verb" },
  68         { BM_EIRQ_FLWI, "FBPR Low Watermark" },
  69         { BM_EIRQ_MBEI, "Multi-bit ECC Error" },
  70         { BM_EIRQ_SBEI, "Single-bit ECC Error" },
  71         { BM_EIRQ_BSCN, "Pool State Change Notification" },
  72 };
  73
  74 /* Only trigger low water mark interrupt once only */
  75 #define BMAN_ERRS_TO_DISABLE BM_EIRQ_FLWI
  76
  77 /* Pointer to the start of the BMan's CCSR space */
  78 static u32 __iomem *bm_ccsr_start;
  79
  80 static inline u32 bm_ccsr_in(u32 offset)
  81 {
  82         return ioread32be(bm_ccsr_start + offset/4);
  83 }
  84 static inline void bm_ccsr_out(u32 offset, u32 val)
  85 {
  86         iowrite32be(val, bm_ccsr_start + offset/4);
  87 }
  88
  89 static void bm_get_version(u16 *id, u8 *major, u8 *minor)
  90 {
  91         u32 v = bm_ccsr_in(REG_IP_REV_1);
  92         *id = (v >> 16);
  93         *major = (v >> 8) & 0xff;
  94         *minor = v & 0xff;
  95 }
  96
  97 /* signal transactions for FBPRs with higher priority */
  98 #define FBPR_AR_RPRIO_HI BIT(30)
  99
 100 static void bm_set_memory(u64 ba, u32 size)
 101 {
 102         u32 exp = ilog2(size);
 103         /* choke if size isn't within range */
 104         DPAA_ASSERT(size >= 4096 && size <= 1024*1024*1024 &&
 105                    is_power_of_2(size));
 106         /* choke if '[e]ba' has lower-alignment than 'size' */
 107         DPAA_ASSERT(!(ba & (size - 1)));
 108         bm_ccsr_out(REG_FBPR_BARE, upper_32_bits(ba));
 109         bm_ccsr_out(REG_FBPR_BAR, lower_32_bits(ba));
 110         bm_ccsr_out(REG_FBPR_AR, exp - 1);
 111 }
 112
 113 /*
 114  * Location and size of BMan private memory
 115  *
 116  * Ideally we would use the DMA API to turn rmem->base into a DMA address
 117  * (especially if iommu translations ever get involved).  Unfortunately, the
 118  * DMA API currently does not allow mapping anything that is not backed with
 119  * a struct page.
 120  */
 121 static dma_addr_t fbpr_a;
 122 static size_t fbpr_sz;
 123
 124 static int bman_fbpr(struct reserved_mem *rmem)
 125 {
 126         fbpr_a = rmem->base;
 127         fbpr_sz = rmem->size;
 128
 129         WARN_ON(!(fbpr_a && fbpr_sz));
 130
 131         return 0;
 132 }
 133 RESERVEDMEM_OF_DECLARE(bman_fbpr, "fsl,bman-fbpr", bman_fbpr);
 134
 135 static irqreturn_t bman_isr(int irq, void *ptr)
 136 {
 137         u32 isr_val, ier_val, ecsr_val, isr_mask, i;
 138         struct device *dev = ptr;
 139
 140         ier_val = bm_ccsr_in(REG_ERR_IER);
 141         isr_val = bm_ccsr_in(REG_ERR_ISR);
 142         ecsr_val = bm_ccsr_in(REG_ECSR);
 143         isr_mask = isr_val & ier_val;
 144
 145         if (!isr_mask)
 146                 return IRQ_NONE;
 147
 148         for (i = 0; i < ARRAY_SIZE(bman_hwerr_txts); i++) {
 149                 if (bman_hwerr_txts[i].mask & isr_mask) {
 150                         dev_err_ratelimited(dev, "ErrInt: %s\n",
 151                                             bman_hwerr_txts[i].txt);
 152                         if (bman_hwerr_txts[i].mask & ecsr_val) {
 153                                 /* Re-arm error capture registers */
 154                                 bm_ccsr_out(REG_ECSR, ecsr_val);
 155                         }
 156                         if (bman_hwerr_txts[i].mask & BMAN_ERRS_TO_DISABLE) {
 157                                 dev_dbg(dev, "Disabling error 0x%x\n",
 158                                         bman_hwerr_txts[i].mask);
 159                                 ier_val &= ~bman_hwerr_txts[i].mask;
 160                                 bm_ccsr_out(REG_ERR_IER, ier_val);
 161                         }
 162                 }
 163         }
 164         bm_ccsr_out(REG_ERR_ISR, isr_val);
 165
 166         return IRQ_HANDLED;
 167 }
 168
 169 static int fsl_bman_probe(struct platform_device *pdev)
 170 {
 171         int ret, err_irq;
 172         struct device *dev = &pdev->dev;
 173         struct device_node *node = dev->of_node;
 174         struct resource *res;
 175         u16 id, bm_pool_cnt;
 176         u8 major, minor;
 177
 178         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 179         if (!res) {
 180                 dev_err(dev, "Can't get %s property 'IORESOURCE_MEM'\n",
 181                         node->full_name);
 182                 return -ENXIO;
 183         }
 184         bm_ccsr_start = devm_ioremap(dev, res->start, resource_size(res));
 185         if (!bm_ccsr_start)
 186                 return -ENXIO;
 187
 188         bm_get_version(&id, &major, &minor);
 189         if (major == 1 && minor == 0) {
 190                 bman_ip_rev = BMAN_REV10;
 191                 bm_pool_cnt = BM_POOL_MAX;
 192         } else if (major == 2 && minor == 0) {
 193                 bman_ip_rev = BMAN_REV20;
 194                 bm_pool_cnt = 8;
 195         } else if (major == 2 && minor == 1) {
 196                 bman_ip_rev = BMAN_REV21;
 197                 bm_pool_cnt = BM_POOL_MAX;
 198         } else {
 199                 dev_err(dev, "Unknown Bman version:%04x,%02x,%02x\n",
 200                         id, major, minor);
 201                 return -ENODEV;
 202         }
 203
 204         bm_set_memory(fbpr_a, fbpr_sz);
 205
 206         err_irq = platform_get_irq(pdev, 0);
 207         if (err_irq <= 0) {
 208                 dev_info(dev, "Can't get %s IRQ\n", node->full_name);
 209                 return -ENODEV;
 210         }
 211         ret = devm_request_irq(dev, err_irq, bman_isr, IRQF_SHARED, "bman-err",
 212                                dev);
 213         if (ret)  {
 214                 dev_err(dev, "devm_request_irq() failed %d for '%s'\n",
 215                         ret, node->full_name);
 216                 return ret;
 217         }
 218         /* Disable Buffer Pool State Change */
 219         bm_ccsr_out(REG_ERR_ISDR, BM_EIRQ_BSCN);
 220         /*
 221          * Write-to-clear any stale bits, (eg. starvation being asserted prior
 222          * to resource allocation during driver init).
 223          */
 224         bm_ccsr_out(REG_ERR_ISR, 0xffffffff);
 225         /* Enable Error Interrupts */
 226         bm_ccsr_out(REG_ERR_IER, 0xffffffff);
 227
 228         bm_bpalloc = devm_gen_pool_create(dev, 0, -1, "bman-bpalloc");
 229         if (IS_ERR(bm_bpalloc)) {
 230                 ret = PTR_ERR(bm_bpalloc);
 231                 dev_err(dev, "bman-bpalloc pool init failed (%d)\n", ret);
 232                 return ret;
 233         }
 234
 235         /* seed BMan resource pool */
 236         ret = gen_pool_add(bm_bpalloc, DPAA_GENALLOC_OFF, bm_pool_cnt, -1);
 237         if (ret) {
 238                 dev_err(dev, "Failed to seed BPID range [%d..%d] (%d)\n",
 239                         0, bm_pool_cnt - 1, ret);
 240                 return ret;
 241         }
 242
 243         return 0;
 244 };
 245
 246 static const struct of_device_id fsl_bman_ids[] = {
 247         {
 248                 .compatible = "fsl,bman",
 249         },
 250         {}
 251 };
 252
 253 static struct platform_driver fsl_bman_driver = {
 254         .driver = {
 255                 .name = KBUILD_MODNAME,
 256                 .of_match_table = fsl_bman_ids,
 257                 .suppress_bind_attrs = true,
 258         },
 259         .probe = fsl_bman_probe,
 260 };
 261
 262 builtin_platform_driver(fsl_bman_driver);