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/platform_device.h>
18 #include <linux/pci.h>
21 static void thunder_mmc_acquire_bus(struct cvm_mmc_host *host)
23 down(&host->mmc_serializer);
26 static void thunder_mmc_release_bus(struct cvm_mmc_host *host)
28 up(&host->mmc_serializer);
31 static void thunder_mmc_int_enable(struct cvm_mmc_host *host, u64 val)
33 writeq(val, host->base + MIO_EMM_INT(host));
34 writeq(val, host->base + MIO_EMM_INT_EN_SET(host));
37 static int thunder_mmc_register_interrupts(struct cvm_mmc_host *host,
42 nvec = pci_alloc_irq_vectors(pdev, 1, 9, PCI_IRQ_MSIX);
46 /* register interrupts */
47 for (i = 0; i < nvec; i++) {
48 ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, i),
50 0, cvm_mmc_irq_names[i], host);
57 static int thunder_mmc_probe(struct pci_dev *pdev,
58 const struct pci_device_id *id)
60 struct device_node *node = pdev->dev.of_node;
61 struct device *dev = &pdev->dev;
62 struct device_node *child_node;
63 struct cvm_mmc_host *host;
66 host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
70 pci_set_drvdata(pdev, host);
71 ret = pcim_enable_device(pdev);
75 ret = pci_request_regions(pdev, KBUILD_MODNAME);
79 host->base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
85 /* On ThunderX these are identical */
86 host->dma_base = host->base;
88 host->reg_off = 0x2000;
89 host->reg_off_dma = 0x160;
91 host->clk = devm_clk_get(dev, NULL);
92 if (IS_ERR(host->clk)) {
93 ret = PTR_ERR(host->clk);
97 ret = clk_prepare_enable(host->clk);
100 host->sys_freq = clk_get_rate(host->clk);
102 spin_lock_init(&host->irq_handler_lock);
103 sema_init(&host->mmc_serializer, 1);
106 host->acquire_bus = thunder_mmc_acquire_bus;
107 host->release_bus = thunder_mmc_release_bus;
108 host->int_enable = thunder_mmc_int_enable;
111 host->big_dma_addr = true;
112 host->need_irq_handler_lock = true;
113 host->last_slot = -1;
115 ret = dma_set_mask(dev, DMA_BIT_MASK(48));
120 * Clear out any pending interrupts that may be left over from
121 * bootloader. Writing 1 to the bits clears them.
123 writeq(127, host->base + MIO_EMM_INT_EN(host));
124 writeq(3, host->base + MIO_EMM_DMA_INT_ENA_W1C(host));
126 writeq(BIT_ULL(16), host->base + MIO_EMM_DMA_FIFO_CFG(host));
128 ret = thunder_mmc_register_interrupts(host, pdev);
132 for_each_child_of_node(node, child_node) {
134 * mmc_of_parse and devm* require one device per slot.
135 * Create a dummy device per slot and set the node pointer to
136 * the slot. The easiest way to get this is using
137 * of_platform_device_create.
139 if (of_device_is_compatible(child_node, "mmc-slot")) {
140 host->slot_pdev[i] = of_platform_device_create(child_node, NULL,
142 if (!host->slot_pdev[i])
145 ret = cvm_mmc_of_slot_probe(&host->slot_pdev[i]->dev, host);
147 of_node_put(child_node);
153 dev_info(dev, "probed\n");
157 for (i = 0; i < CAVIUM_MAX_MMC; i++) {
159 cvm_mmc_of_slot_remove(host->slot[i]);
160 if (host->slot_pdev[i]) {
161 get_device(&host->slot_pdev[i]->dev);
162 of_platform_device_destroy(&host->slot_pdev[i]->dev, NULL);
163 put_device(&host->slot_pdev[i]->dev);
166 clk_disable_unprepare(host->clk);
167 pci_release_regions(pdev);
171 static void thunder_mmc_remove(struct pci_dev *pdev)
173 struct cvm_mmc_host *host = pci_get_drvdata(pdev);
177 for (i = 0; i < CAVIUM_MAX_MMC; i++)
179 cvm_mmc_of_slot_remove(host->slot[i]);
181 dma_cfg = readq(host->dma_base + MIO_EMM_DMA_CFG(host));
182 dma_cfg &= ~MIO_EMM_DMA_CFG_EN;
183 writeq(dma_cfg, host->dma_base + MIO_EMM_DMA_CFG(host));
185 clk_disable_unprepare(host->clk);
186 pci_release_regions(pdev);
189 static const struct pci_device_id thunder_mmc_id_table[] = {
190 { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa010) },
191 { 0, } /* end of table */
194 static struct pci_driver thunder_mmc_driver = {
195 .name = KBUILD_MODNAME,
196 .id_table = thunder_mmc_id_table,
197 .probe = thunder_mmc_probe,
198 .remove = thunder_mmc_remove,
201 module_pci_driver(thunder_mmc_driver);
203 MODULE_AUTHOR("Cavium Inc.");
204 MODULE_DESCRIPTION("Cavium ThunderX eMMC Driver");
205 MODULE_LICENSE("GPL");
206 MODULE_DEVICE_TABLE(pci, thunder_mmc_id_table);