drivers/mmc/host/cavium-thunderx.c

   1 /*
   2  * Driver for MMC and SSD cards for Cavium ThunderX SOCs.
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2016 Cavium Inc.
   9  */
  10 #include <linux/device.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/mmc/mmc.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/pci.h>
  18 #include "cavium.h"
  19
  20 static void thunder_mmc_acquire_bus(struct cvm_mmc_host *host)
  21 {
  22         down(&host->mmc_serializer);
  23 }
  24
  25 static void thunder_mmc_release_bus(struct cvm_mmc_host *host)
  26 {
  27         up(&host->mmc_serializer);
  28 }
  29
  30 static void thunder_mmc_int_enable(struct cvm_mmc_host *host, u64 val)
  31 {
  32         writeq(val, host->base + MIO_EMM_INT(host));
  33         writeq(val, host->base + MIO_EMM_INT_EN_SET(host));
  34 }
  35
  36 static int thunder_mmc_register_interrupts(struct cvm_mmc_host *host,
  37                                            struct pci_dev *pdev)
  38 {
  39         int nvec, ret, i;
  40
  41         nvec = pci_alloc_irq_vectors(pdev, 1, 9, PCI_IRQ_MSIX);
  42         if (nvec < 0)
  43                 return nvec;
  44
  45         /* register interrupts */
  46         for (i = 0; i < nvec; i++) {
  47                 ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, i),
  48                                        cvm_mmc_interrupt,
  49                                        0, cvm_mmc_irq_names[i], host);
  50                 if (ret)
  51                         return ret;
  52         }
  53         return 0;
  54 }
  55
  56 static int thunder_mmc_probe(struct pci_dev *pdev,
  57                              const struct pci_device_id *id)
  58 {
  59         struct device_node *node = pdev->dev.of_node;
  60         struct device *dev = &pdev->dev;
  61         struct device_node *child_node;
  62         struct cvm_mmc_host *host;
  63         int ret, i = 0;
  64
  65         host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
  66         if (!host)
  67                 return -ENOMEM;
  68
  69         pci_set_drvdata(pdev, host);
  70         ret = pcim_enable_device(pdev);
  71         if (ret)
  72                 return ret;
  73
  74         ret = pci_request_regions(pdev, KBUILD_MODNAME);
  75         if (ret)
  76                 return ret;
  77
  78         host->base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
  79         if (!host->base) {
  80                 ret = -EINVAL;
  81                 goto error;
  82         }
  83
  84         /* On ThunderX these are identical */
  85         host->dma_base = host->base;
  86
  87         host->reg_off = 0x2000;
  88         host->reg_off_dma = 0x160;
  89
  90         host->clk = devm_clk_get(dev, NULL);
  91         if (IS_ERR(host->clk)) {
  92                 ret = PTR_ERR(host->clk);
  93                 goto error;
  94         }
  95
  96         ret = clk_prepare_enable(host->clk);
  97         if (ret)
  98                 goto error;
  99         host->sys_freq = clk_get_rate(host->clk);
 100
 101         spin_lock_init(&host->irq_handler_lock);
 102         sema_init(&host->mmc_serializer, 1);
 103
 104         host->dev = dev;
 105         host->acquire_bus = thunder_mmc_acquire_bus;
 106         host->release_bus = thunder_mmc_release_bus;
 107         host->int_enable = thunder_mmc_int_enable;
 108
 109         host->use_sg = true;
 110         host->big_dma_addr = true;
 111         host->need_irq_handler_lock = true;
 112         host->last_slot = -1;
 113
 114         ret = dma_set_mask(dev, DMA_BIT_MASK(48));
 115         if (ret)
 116                 goto error;
 117
 118         /*
 119          * Clear out any pending interrupts that may be left over from
 120          * bootloader. Writing 1 to the bits clears them.
 121          */
 122         writeq(127, host->base + MIO_EMM_INT_EN(host));
 123         writeq(3, host->base + MIO_EMM_DMA_INT_ENA_W1C(host));
 124         /* Clear DMA FIFO */
 125         writeq(BIT_ULL(16), host->base + MIO_EMM_DMA_FIFO_CFG(host));
 126
 127         ret = thunder_mmc_register_interrupts(host, pdev);
 128         if (ret)
 129                 goto error;
 130
 131         for_each_child_of_node(node, child_node) {
 132                 /*
 133                  * mmc_of_parse and devm* require one device per slot.
 134                  * Create a dummy device per slot and set the node pointer to
 135                  * the slot. The easiest way to get this is using
 136                  * of_platform_device_create.
 137                  */
 138                 if (of_device_is_compatible(child_node, "mmc-slot")) {
 139                         host->slot_pdev[i] = of_platform_device_create(child_node, NULL,
 140                                                                        &pdev->dev);
 141                         if (!host->slot_pdev[i])
 142                                 continue;
 143
 144                         ret = cvm_mmc_of_slot_probe(&host->slot_pdev[i]->dev, host);
 145                         if (ret)
 146                                 goto error;
 147                 }
 148                 i++;
 149         }
 150         dev_info(dev, "probed\n");
 151         return 0;
 152
 153 error:
 154         for (i = 0; i < CAVIUM_MAX_MMC; i++) {
 155                 if (host->slot[i])
 156                         cvm_mmc_of_slot_remove(host->slot[i]);
 157                 if (host->slot_pdev[i]) {
 158                         get_device(&host->slot_pdev[i]->dev);
 159                         of_platform_device_destroy(&host->slot_pdev[i]->dev, NULL);
 160                         put_device(&host->slot_pdev[i]->dev);
 161                 }
 162         }
 163         clk_disable_unprepare(host->clk);
 164         pci_release_regions(pdev);
 165         return ret;
 166 }
 167
 168 static void thunder_mmc_remove(struct pci_dev *pdev)
 169 {
 170         struct cvm_mmc_host *host = pci_get_drvdata(pdev);
 171         u64 dma_cfg;
 172         int i;
 173
 174         for (i = 0; i < CAVIUM_MAX_MMC; i++)
 175                 if (host->slot[i])
 176                         cvm_mmc_of_slot_remove(host->slot[i]);
 177
 178         dma_cfg = readq(host->dma_base + MIO_EMM_DMA_CFG(host));
 179         dma_cfg &= ~MIO_EMM_DMA_CFG_EN;
 180         writeq(dma_cfg, host->dma_base + MIO_EMM_DMA_CFG(host));
 181
 182         clk_disable_unprepare(host->clk);
 183         pci_release_regions(pdev);
 184 }
 185
 186 static const struct pci_device_id thunder_mmc_id_table[] = {
 187         { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa010) },
 188         { 0, }  /* end of table */
 189 };
 190
 191 static struct pci_driver thunder_mmc_driver = {
 192         .name = KBUILD_MODNAME,
 193         .id_table = thunder_mmc_id_table,
 194         .probe = thunder_mmc_probe,
 195         .remove = thunder_mmc_remove,
 196 };
 197
 198 module_pci_driver(thunder_mmc_driver);
 199
 200 MODULE_AUTHOR("Cavium Inc.");
 201 MODULE_DESCRIPTION("Cavium ThunderX eMMC Driver");
 202 MODULE_LICENSE("GPL");
 203 MODULE_DEVICE_TABLE(pci, thunder_mmc_id_table);