2 * Driver for MMC and SSD cards for Cavium ThunderX SOCs.
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
8 * Copyright (C) 2016 Cavium Inc.
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>
16 #include <linux/of_platform.h>
17 #include <linux/pci.h>
20 static void thunder_mmc_acquire_bus(struct cvm_mmc_host *host)
22 down(&host->mmc_serializer);
25 static void thunder_mmc_release_bus(struct cvm_mmc_host *host)
27 up(&host->mmc_serializer);
30 static void thunder_mmc_int_enable(struct cvm_mmc_host *host, u64 val)
32 writeq(val, host->base + MIO_EMM_INT(host));
33 writeq(val, host->base + MIO_EMM_INT_EN_SET(host));
36 static int thunder_mmc_register_interrupts(struct cvm_mmc_host *host,
41 nvec = pci_alloc_irq_vectors(pdev, 1, 9, PCI_IRQ_MSIX);
45 /* register interrupts */
46 for (i = 0; i < nvec; i++) {
47 ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, i),
49 0, cvm_mmc_irq_names[i], host);
56 static int thunder_mmc_probe(struct pci_dev *pdev,
57 const struct pci_device_id *id)
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;
65 host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
69 pci_set_drvdata(pdev, host);
70 ret = pcim_enable_device(pdev);
74 ret = pci_request_regions(pdev, KBUILD_MODNAME);
78 host->base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
82 /* On ThunderX these are identical */
83 host->dma_base = host->base;
85 host->reg_off = 0x2000;
86 host->reg_off_dma = 0x160;
88 host->clk = devm_clk_get(dev, NULL);
89 if (IS_ERR(host->clk))
90 return PTR_ERR(host->clk);
92 ret = clk_prepare_enable(host->clk);
95 host->sys_freq = clk_get_rate(host->clk);
97 spin_lock_init(&host->irq_handler_lock);
98 sema_init(&host->mmc_serializer, 1);
101 host->acquire_bus = thunder_mmc_acquire_bus;
102 host->release_bus = thunder_mmc_release_bus;
103 host->int_enable = thunder_mmc_int_enable;
106 host->big_dma_addr = true;
107 host->need_irq_handler_lock = true;
108 host->last_slot = -1;
110 ret = dma_set_mask(dev, DMA_BIT_MASK(48));
115 * Clear out any pending interrupts that may be left over from
116 * bootloader. Writing 1 to the bits clears them.
118 writeq(127, host->base + MIO_EMM_INT_EN(host));
119 writeq(3, host->base + MIO_EMM_DMA_INT_ENA_W1C(host));
121 writeq(BIT_ULL(16), host->base + MIO_EMM_DMA_FIFO_CFG(host));
123 ret = thunder_mmc_register_interrupts(host, pdev);
127 for_each_child_of_node(node, child_node) {
129 * mmc_of_parse and devm* require one device per slot.
130 * Create a dummy device per slot and set the node pointer to
131 * the slot. The easiest way to get this is using
132 * of_platform_device_create.
134 if (of_device_is_compatible(child_node, "mmc-slot")) {
135 host->slot_pdev[i] = of_platform_device_create(child_node, NULL,
137 if (!host->slot_pdev[i])
140 ret = cvm_mmc_of_slot_probe(&host->slot_pdev[i]->dev, host);
146 dev_info(dev, "probed\n");
150 for (i = 0; i < CAVIUM_MAX_MMC; i++) {
152 cvm_mmc_of_slot_remove(host->slot[i]);
153 if (host->slot_pdev[i]) {
154 get_device(&host->slot_pdev[i]->dev);
155 of_platform_device_destroy(&host->slot_pdev[i]->dev, NULL);
156 put_device(&host->slot_pdev[i]->dev);
159 clk_disable_unprepare(host->clk);
163 static void thunder_mmc_remove(struct pci_dev *pdev)
165 struct cvm_mmc_host *host = pci_get_drvdata(pdev);
169 for (i = 0; i < CAVIUM_MAX_MMC; i++)
171 cvm_mmc_of_slot_remove(host->slot[i]);
173 dma_cfg = readq(host->dma_base + MIO_EMM_DMA_CFG(host));
174 dma_cfg &= ~MIO_EMM_DMA_CFG_EN;
175 writeq(dma_cfg, host->dma_base + MIO_EMM_DMA_CFG(host));
177 clk_disable_unprepare(host->clk);
180 static const struct pci_device_id thunder_mmc_id_table[] = {
181 { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa010) },
182 { 0, } /* end of table */
185 static struct pci_driver thunder_mmc_driver = {
186 .name = KBUILD_MODNAME,
187 .id_table = thunder_mmc_id_table,
188 .probe = thunder_mmc_probe,
189 .remove = thunder_mmc_remove,
192 module_pci_driver(thunder_mmc_driver);
194 MODULE_AUTHOR("Cavium Inc.");
195 MODULE_DESCRIPTION("Cavium ThunderX eMMC Driver");
196 MODULE_LICENSE("GPL");
197 MODULE_DEVICE_TABLE(pci, thunder_mmc_id_table);