--- /dev/null
+/*
+ * Driver for MMC and SSD cards for Cavium ThunderX SOCs.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2016 Cavium Inc.
+ */
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/mmc/mmc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include "cavium.h"
+
+static void thunder_mmc_acquire_bus(struct cvm_mmc_host *host)
+{
+ down(&host->mmc_serializer);
+}
+
+static void thunder_mmc_release_bus(struct cvm_mmc_host *host)
+{
+ up(&host->mmc_serializer);
+}
+
+static void thunder_mmc_int_enable(struct cvm_mmc_host *host, u64 val)
+{
+ writeq(val, host->base + MIO_EMM_INT(host));
+ writeq(val, host->base + MIO_EMM_INT_EN_SET(host));
+}
+
+static int thunder_mmc_register_interrupts(struct cvm_mmc_host *host,
+ struct pci_dev *pdev)
+{
+ int nvec, ret, i;
+
+ nvec = pci_alloc_irq_vectors(pdev, 1, 9, PCI_IRQ_MSIX);
+ if (nvec < 0)
+ return nvec;
+
+ /* register interrupts */
+ for (i = 0; i < nvec; i++) {
+ ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, i),
+ cvm_mmc_interrupt,
+ 0, cvm_mmc_irq_names[i], host);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static int thunder_mmc_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct device_node *child_node;
+ struct cvm_mmc_host *host;
+ int ret, i = 0;
+
+ host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return -ENOMEM;
+
+ pci_set_drvdata(pdev, host);
+ ret = pcim_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ ret = pci_request_regions(pdev, KBUILD_MODNAME);
+ if (ret)
+ return ret;
+
+ host->base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
+ if (!host->base)
+ return -EINVAL;
+
+ /* On ThunderX these are identical */
+ host->dma_base = host->base;
+
+ host->reg_off = 0x2000;
+ host->reg_off_dma = 0x180;
+
+ host->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(host->clk))
+ return PTR_ERR(host->clk);
+
+ ret = clk_prepare_enable(host->clk);
+ if (ret)
+ return ret;
+ host->sys_freq = clk_get_rate(host->clk);
+
+ spin_lock_init(&host->irq_handler_lock);
+ sema_init(&host->mmc_serializer, 1);
+
+ host->dev = dev;
+ host->acquire_bus = thunder_mmc_acquire_bus;
+ host->release_bus = thunder_mmc_release_bus;
+ host->int_enable = thunder_mmc_int_enable;
+
+ host->big_dma_addr = true;
+ host->need_irq_handler_lock = true;
+ host->last_slot = -1;
+
+ ret = dma_set_mask(dev, DMA_BIT_MASK(48));
+ if (ret)
+ goto error;
+
+ /*
+ * Clear out any pending interrupts that may be left over from
+ * bootloader. Writing 1 to the bits clears them.
+ */
+ writeq(127, host->base + MIO_EMM_INT_EN(host));
+ writeq(3, host->base + MIO_EMM_DMA_INT_ENA_W1C(host));
+
+ ret = thunder_mmc_register_interrupts(host, pdev);
+ if (ret)
+ goto error;
+
+ for_each_child_of_node(node, child_node) {
+ /*
+ * mmc_of_parse and devm* require one device per slot.
+ * Create a dummy device per slot and set the node pointer to
+ * the slot. The easiest way to get this is using
+ * of_platform_device_create.
+ */
+ if (of_device_is_compatible(child_node, "mmc-slot")) {
+ host->slot_pdev[i] = of_platform_device_create(child_node, NULL,
+ &pdev->dev);
+ if (!host->slot_pdev[i])
+ continue;
+
+ ret = cvm_mmc_of_slot_probe(&host->slot_pdev[i]->dev, host);
+ if (ret)
+ goto error;
+ }
+ i++;
+ }
+ dev_info(dev, "probed\n");
+ return 0;
+
+error:
+ clk_disable_unprepare(host->clk);
+ return ret;
+}
+
+static void thunder_mmc_remove(struct pci_dev *pdev)
+{
+ struct cvm_mmc_host *host = pci_get_drvdata(pdev);
+ u64 dma_cfg;
+ int i;
+
+ for (i = 0; i < CAVIUM_MAX_MMC; i++)
+ if (host->slot[i])
+ cvm_mmc_of_slot_remove(host->slot[i]);
+
+ dma_cfg = readq(host->dma_base + MIO_EMM_DMA_CFG(host));
+ dma_cfg &= ~MIO_EMM_DMA_CFG_EN;
+ writeq(dma_cfg, host->dma_base + MIO_EMM_DMA_CFG(host));
+
+ clk_disable_unprepare(host->clk);
+}
+
+static const struct pci_device_id thunder_mmc_id_table[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa010) },
+ { 0, } /* end of table */
+};
+
+static struct pci_driver thunder_mmc_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = thunder_mmc_id_table,
+ .probe = thunder_mmc_probe,
+ .remove = thunder_mmc_remove,
+};
+
+static int __init thunder_mmc_init_module(void)
+{
+ return pci_register_driver(&thunder_mmc_driver);
+}
+
+static void __exit thunder_mmc_exit_module(void)
+{
+ pci_unregister_driver(&thunder_mmc_driver);
+}
+
+module_init(thunder_mmc_init_module);
+module_exit(thunder_mmc_exit_module);
+
+MODULE_AUTHOR("Cavium Inc.");
+MODULE_DESCRIPTION("Cavium ThunderX eMMC Driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, thunder_mmc_id_table);
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff