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); 204