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