![Jan Glauber](/assets/img/avatar_default.png)
If the regulator probing is not yet finished this driver might catch a -EPROBE_DEFER. Returning after this condition did not remove the created platform device. On a repeated call to the probe function the of_platform_device_create fails. Calling of_platform_device_destroy after EPROBE_DEFER resolves this bug. Signed-off-by: Jan Glauber <jglauber@cavium.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
194 lines
4.7 KiB
C
194 lines
4.7 KiB
C
/*
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* Driver for MMC and SSD cards for Cavium ThunderX SOCs.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2016 Cavium Inc.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/interrupt.h>
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#include <linux/mmc/mmc.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/pci.h>
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#include "cavium.h"
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static void thunder_mmc_acquire_bus(struct cvm_mmc_host *host)
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{
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down(&host->mmc_serializer);
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}
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static void thunder_mmc_release_bus(struct cvm_mmc_host *host)
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{
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up(&host->mmc_serializer);
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}
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static void thunder_mmc_int_enable(struct cvm_mmc_host *host, u64 val)
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{
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writeq(val, host->base + MIO_EMM_INT(host));
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writeq(val, host->base + MIO_EMM_INT_EN_SET(host));
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}
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static int thunder_mmc_register_interrupts(struct cvm_mmc_host *host,
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struct pci_dev *pdev)
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{
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int nvec, ret, i;
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nvec = pci_alloc_irq_vectors(pdev, 1, 9, PCI_IRQ_MSIX);
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if (nvec < 0)
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return nvec;
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/* register interrupts */
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for (i = 0; i < nvec; i++) {
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ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, i),
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cvm_mmc_interrupt,
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0, cvm_mmc_irq_names[i], host);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int thunder_mmc_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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struct device_node *node = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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struct device_node *child_node;
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struct cvm_mmc_host *host;
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int ret, i = 0;
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host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
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if (!host)
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return -ENOMEM;
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pci_set_drvdata(pdev, host);
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ret = pcim_enable_device(pdev);
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if (ret)
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return ret;
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ret = pci_request_regions(pdev, KBUILD_MODNAME);
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if (ret)
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return ret;
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host->base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
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if (!host->base)
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return -EINVAL;
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/* On ThunderX these are identical */
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host->dma_base = host->base;
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host->reg_off = 0x2000;
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host->reg_off_dma = 0x160;
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host->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(host->clk))
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return PTR_ERR(host->clk);
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ret = clk_prepare_enable(host->clk);
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if (ret)
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return ret;
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host->sys_freq = clk_get_rate(host->clk);
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spin_lock_init(&host->irq_handler_lock);
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sema_init(&host->mmc_serializer, 1);
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host->dev = dev;
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host->acquire_bus = thunder_mmc_acquire_bus;
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host->release_bus = thunder_mmc_release_bus;
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host->int_enable = thunder_mmc_int_enable;
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host->use_sg = true;
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host->big_dma_addr = true;
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host->need_irq_handler_lock = true;
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host->last_slot = -1;
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ret = dma_set_mask(dev, DMA_BIT_MASK(48));
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if (ret)
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goto error;
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/*
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* Clear out any pending interrupts that may be left over from
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* bootloader. Writing 1 to the bits clears them.
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*/
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writeq(127, host->base + MIO_EMM_INT_EN(host));
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writeq(3, host->base + MIO_EMM_DMA_INT_ENA_W1C(host));
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/* Clear DMA FIFO */
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writeq(BIT_ULL(16), host->base + MIO_EMM_DMA_FIFO_CFG(host));
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ret = thunder_mmc_register_interrupts(host, pdev);
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if (ret)
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goto error;
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for_each_child_of_node(node, child_node) {
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/*
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* mmc_of_parse and devm* require one device per slot.
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* Create a dummy device per slot and set the node pointer to
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* the slot. The easiest way to get this is using
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* of_platform_device_create.
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*/
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if (of_device_is_compatible(child_node, "mmc-slot")) {
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host->slot_pdev[i] = of_platform_device_create(child_node, NULL,
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&pdev->dev);
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if (!host->slot_pdev[i])
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continue;
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ret = cvm_mmc_of_slot_probe(&host->slot_pdev[i]->dev, host);
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if (ret)
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goto error;
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}
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i++;
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}
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dev_info(dev, "probed\n");
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return 0;
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error:
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for (i = 0; i < CAVIUM_MAX_MMC; i++) {
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if (host->slot[i])
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cvm_mmc_of_slot_remove(host->slot[i]);
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if (host->slot_pdev[i])
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of_platform_device_destroy(&host->slot_pdev[i]->dev, NULL);
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}
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clk_disable_unprepare(host->clk);
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return ret;
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}
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static void thunder_mmc_remove(struct pci_dev *pdev)
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{
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struct cvm_mmc_host *host = pci_get_drvdata(pdev);
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u64 dma_cfg;
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int i;
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for (i = 0; i < CAVIUM_MAX_MMC; i++)
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if (host->slot[i])
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cvm_mmc_of_slot_remove(host->slot[i]);
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dma_cfg = readq(host->dma_base + MIO_EMM_DMA_CFG(host));
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dma_cfg &= ~MIO_EMM_DMA_CFG_EN;
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writeq(dma_cfg, host->dma_base + MIO_EMM_DMA_CFG(host));
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clk_disable_unprepare(host->clk);
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}
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static const struct pci_device_id thunder_mmc_id_table[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa010) },
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{ 0, } /* end of table */
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};
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static struct pci_driver thunder_mmc_driver = {
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.name = KBUILD_MODNAME,
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.id_table = thunder_mmc_id_table,
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.probe = thunder_mmc_probe,
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.remove = thunder_mmc_remove,
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};
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module_pci_driver(thunder_mmc_driver);
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MODULE_AUTHOR("Cavium Inc.");
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MODULE_DESCRIPTION("Cavium ThunderX eMMC Driver");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, thunder_mmc_id_table);
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