diff options
Diffstat (limited to 'drivers/misc/mic/card/mic_x100.c')
| -rw-r--r-- | drivers/misc/mic/card/mic_x100.c | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/drivers/misc/mic/card/mic_x100.c b/drivers/misc/mic/card/mic_x100.c new file mode 100644 index 000000000..4007adc66 --- /dev/null +++ b/drivers/misc/mic/card/mic_x100.c @@ -0,0 +1,359 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2013 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Disclaimer: The codes contained in these modules may be specific to + * the Intel Software Development Platform codenamed: Knights Ferry, and + * the Intel product codenamed: Knights Corner, and are not backward + * compatible with other Intel products. Additionally, Intel will NOT + * support the codes or instruction set in future products. + * + * Intel MIC Card driver. + * + */ +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/platform_device.h> + +#include "../common/mic_dev.h" +#include "mic_device.h" +#include "mic_x100.h" + +static const char mic_driver_name[] = "mic"; + +static struct mic_driver g_drv; + +/** + * mic_read_spad - read from the scratchpad register + * @mdev: pointer to mic_device instance + * @idx: index to scratchpad register, 0 based + * + * This function allows reading of the 32bit scratchpad register. + * + * RETURNS: An appropriate -ERRNO error value on error, or zero for success. + */ +u32 mic_read_spad(struct mic_device *mdev, unsigned int idx) +{ + return mic_mmio_read(&mdev->mmio, + MIC_X100_SBOX_BASE_ADDRESS + + MIC_X100_SBOX_SPAD0 + idx * 4); +} + +/** + * __mic_send_intr - Send interrupt to Host. + * @mdev: pointer to mic_device instance + * @doorbell: Doorbell number. + */ +void mic_send_intr(struct mic_device *mdev, int doorbell) +{ + struct mic_mw *mw = &mdev->mmio; + + if (doorbell > MIC_X100_MAX_DOORBELL_IDX) + return; + /* Ensure that the interrupt is ordered w.r.t previous stores. */ + wmb(); + mic_mmio_write(mw, MIC_X100_SBOX_SDBIC0_DBREQ_BIT, + MIC_X100_SBOX_BASE_ADDRESS + + (MIC_X100_SBOX_SDBIC0 + (4 * doorbell))); +} + +/* + * mic_x100_send_sbox_intr - Send an MIC_X100_SBOX interrupt to MIC. + */ +static void mic_x100_send_sbox_intr(struct mic_mw *mw, int doorbell) +{ + u64 apic_icr_offset = MIC_X100_SBOX_APICICR0 + doorbell * 8; + u32 apicicr_low = mic_mmio_read(mw, MIC_X100_SBOX_BASE_ADDRESS + + apic_icr_offset); + + /* for MIC we need to make sure we "hit" the send_icr bit (13) */ + apicicr_low = (apicicr_low | (1 << 13)); + /* + * Ensure that the interrupt is ordered w.r.t. previous stores + * to main memory. Fence instructions are not implemented in X100 + * since execution is in order but a compiler barrier is still + * required. + */ + wmb(); + mic_mmio_write(mw, apicicr_low, + MIC_X100_SBOX_BASE_ADDRESS + apic_icr_offset); +} + +static void mic_x100_send_rdmasr_intr(struct mic_mw *mw, int doorbell) +{ + int rdmasr_offset = MIC_X100_SBOX_RDMASR0 + (doorbell << 2); + /* + * Ensure that the interrupt is ordered w.r.t. previous stores + * to main memory. Fence instructions are not implemented in X100 + * since execution is in order but a compiler barrier is still + * required. + */ + wmb(); + mic_mmio_write(mw, 0, MIC_X100_SBOX_BASE_ADDRESS + rdmasr_offset); +} + +/** + * mic_ack_interrupt - Device specific interrupt handling. + * @mdev: pointer to mic_device instance + * + * Returns: bitmask of doorbell events triggered. + */ +u32 mic_ack_interrupt(struct mic_device *mdev) +{ + return 0; +} + +static inline int mic_get_sbox_irq(int db) +{ + return MIC_X100_IRQ_BASE + db; +} + +static inline int mic_get_rdmasr_irq(int index) +{ + return MIC_X100_RDMASR_IRQ_BASE + index; +} + +void mic_send_p2p_intr(int db, struct mic_mw *mw) +{ + int rdmasr_index; + + if (db < MIC_X100_NUM_SBOX_IRQ) { + mic_x100_send_sbox_intr(mw, db); + } else { + rdmasr_index = db - MIC_X100_NUM_SBOX_IRQ; + mic_x100_send_rdmasr_intr(mw, rdmasr_index); + } +} + +/** + * mic_hw_intr_init - Initialize h/w specific interrupt + * information. + * @mdrv: pointer to mic_driver + */ +void mic_hw_intr_init(struct mic_driver *mdrv) +{ + mdrv->intr_info.num_intr = MIC_X100_NUM_SBOX_IRQ + + MIC_X100_NUM_RDMASR_IRQ; +} + +/** + * mic_db_to_irq - Retrieve irq number corresponding to a doorbell. + * @mdrv: pointer to mic_driver + * @db: The doorbell obtained for which the irq is needed. Doorbell + * may correspond to an sbox doorbell or an rdmasr index. + * + * Returns the irq corresponding to the doorbell. + */ +int mic_db_to_irq(struct mic_driver *mdrv, int db) +{ + int rdmasr_index; + + /* + * The total number of doorbell interrupts on the card are 16. Indices + * 0-8 falls in the SBOX category and 8-15 fall in the RDMASR category. + */ + if (db < MIC_X100_NUM_SBOX_IRQ) { + return mic_get_sbox_irq(db); + } else { + rdmasr_index = db - MIC_X100_NUM_SBOX_IRQ; + return mic_get_rdmasr_irq(rdmasr_index); + } +} + +/* + * mic_card_map - Allocate virtual address for a remote memory region. + * @mdev: pointer to mic_device instance. + * @addr: Remote DMA address. + * @size: Size of the region. + * + * Returns: Virtual address backing the remote memory region. + */ +void __iomem * +mic_card_map(struct mic_device *mdev, dma_addr_t addr, size_t size) +{ + return ioremap(addr, size); +} + +/* + * mic_card_unmap - Unmap the virtual address for a remote memory region. + * @mdev: pointer to mic_device instance. + * @addr: Virtual address for remote memory region. + * + * Returns: None. + */ +void mic_card_unmap(struct mic_device *mdev, void __iomem *addr) +{ + iounmap(addr); +} + +static inline struct mic_driver *mbdev_to_mdrv(struct mbus_device *mbdev) +{ + return dev_get_drvdata(mbdev->dev.parent); +} + +static struct mic_irq * +_mic_request_threaded_irq(struct mbus_device *mbdev, + irq_handler_t handler, irq_handler_t thread_fn, + const char *name, void *data, int intr_src) +{ + int rc = 0; + unsigned int irq = intr_src; + unsigned long cookie = irq; + + rc = request_threaded_irq(irq, handler, thread_fn, 0, name, data); + if (rc) { + dev_err(mbdev_to_mdrv(mbdev)->dev, + "request_threaded_irq failed rc = %d\n", rc); + return ERR_PTR(rc); + } + return (struct mic_irq *)cookie; +} + +static void _mic_free_irq(struct mbus_device *mbdev, + struct mic_irq *cookie, void *data) +{ + unsigned long irq = (unsigned long)cookie; + free_irq(irq, data); +} + +static void _mic_ack_interrupt(struct mbus_device *mbdev, int num) +{ + mic_ack_interrupt(&mbdev_to_mdrv(mbdev)->mdev); +} + +static struct mbus_hw_ops mbus_hw_ops = { + .request_threaded_irq = _mic_request_threaded_irq, + .free_irq = _mic_free_irq, + .ack_interrupt = _mic_ack_interrupt, +}; + +static int __init mic_probe(struct platform_device *pdev) +{ + struct mic_driver *mdrv = &g_drv; + struct mic_device *mdev = &mdrv->mdev; + int rc = 0; + + mdrv->dev = &pdev->dev; + snprintf(mdrv->name, sizeof(mic_driver_name), mic_driver_name); + + /* FIXME: use dma_set_mask_and_coherent() and check result */ + dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); + + mdev->mmio.pa = MIC_X100_MMIO_BASE; + mdev->mmio.len = MIC_X100_MMIO_LEN; + mdev->mmio.va = devm_ioremap(&pdev->dev, MIC_X100_MMIO_BASE, + MIC_X100_MMIO_LEN); + if (!mdev->mmio.va) { + dev_err(&pdev->dev, "Cannot remap MMIO BAR\n"); + rc = -EIO; + goto done; + } + mic_hw_intr_init(mdrv); + platform_set_drvdata(pdev, mdrv); + mdrv->dma_mbdev = mbus_register_device(mdrv->dev, MBUS_DEV_DMA_MIC, + NULL, &mbus_hw_ops, 0, + mdrv->mdev.mmio.va); + if (IS_ERR(mdrv->dma_mbdev)) { + rc = PTR_ERR(mdrv->dma_mbdev); + dev_err(&pdev->dev, "mbus_add_device failed rc %d\n", rc); + goto done; + } + rc = mic_driver_init(mdrv); + if (rc) { + dev_err(&pdev->dev, "mic_driver_init failed rc %d\n", rc); + goto remove_dma; + } +done: + return rc; +remove_dma: + mbus_unregister_device(mdrv->dma_mbdev); + return rc; +} + +static int mic_remove(struct platform_device *pdev) +{ + struct mic_driver *mdrv = &g_drv; + + mic_driver_uninit(mdrv); + mbus_unregister_device(mdrv->dma_mbdev); + return 0; +} + +static void mic_platform_shutdown(struct platform_device *pdev) +{ + mic_remove(pdev); +} + +static struct platform_driver __refdata mic_platform_driver = { + .probe = mic_probe, + .remove = mic_remove, + .shutdown = mic_platform_shutdown, + .driver = { + .name = mic_driver_name, + }, +}; + +static struct platform_device *mic_platform_dev; + +static int __init mic_init(void) +{ + int ret; + struct cpuinfo_x86 *c = &cpu_data(0); + + if (!(c->x86 == 11 && c->x86_model == 1)) { + ret = -ENODEV; + pr_err("%s not running on X100 ret %d\n", __func__, ret); + goto done; + } + + request_module("mic_x100_dma"); + mic_init_card_debugfs(); + + mic_platform_dev = platform_device_register_simple(mic_driver_name, + 0, NULL, 0); + ret = PTR_ERR_OR_ZERO(mic_platform_dev); + if (ret) { + pr_err("platform_device_register_full ret %d\n", ret); + goto cleanup_debugfs; + } + ret = platform_driver_register(&mic_platform_driver); + if (ret) { + pr_err("platform_driver_register ret %d\n", ret); + goto device_unregister; + } + return ret; + +device_unregister: + platform_device_unregister(mic_platform_dev); +cleanup_debugfs: + mic_exit_card_debugfs(); +done: + return ret; +} + +static void __exit mic_exit(void) +{ + platform_driver_unregister(&mic_platform_driver); + platform_device_unregister(mic_platform_dev); + mic_exit_card_debugfs(); +} + +module_init(mic_init); +module_exit(mic_exit); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("Intel(R) MIC X100 Card driver"); +MODULE_LICENSE("GPL v2"); |