diff options
Diffstat (limited to 'drivers/misc/mic/imx-card/imx_mic_boot.c')
| -rw-r--r-- | drivers/misc/mic/imx-card/imx_mic_boot.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/drivers/misc/mic/imx-card/imx_mic_boot.c b/drivers/misc/mic/imx-card/imx_mic_boot.c new file mode 100644 index 000000000000..49dd160ed9b6 --- /dev/null +++ b/drivers/misc/mic/imx-card/imx_mic_boot.c @@ -0,0 +1,191 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright 2020 NXP + +#include <linux/imx_mic_epf.h> +#include "imx_mic_boot.h" +#include "../common/imx_mic_common.h" + +static const char imx_mic_driver_name[] = "imx_mic"; + +static struct imx_mic_driver *g_mdrv; + +/* + * Just enable irq here since irq is requested in imx_mic_driver_init function. + */ +static struct mic_irq *_imx_mic_request_irq(struct vop_device *vpdev, + irqreturn_t (*func)(int irq, void *data), + const char *name, void *data, int intr_src) +{ + struct imx_mic_driver *mdrv = g_mdrv; + struct imx_mic_intr *mintr = mdrv->mintr; + unsigned long cookie = intr_src; + int ret; + + if (cookie == MIC_CONFIG_DB) { + mintr->config_intr = func; + mintr->config_intr_priv = data; + } else if (cookie == MIC_DATA_DB) { + mintr->data_intr = func; + mintr->data_intr_priv = data; + } else { + dev_err(mdrv->dev, "invalid doorbell index\n"); + ret = -EINVAL; + goto err; + } + + imx_mic_intr_enable(mdrv, cookie); + + return (struct mic_irq *)cookie; + +err: + return ERR_PTR(ret); +} + +/* + * Just disable irq here since irq is freed in imx_mic_driver_uninit function. + */ +static void _imx_mic_free_irq(struct vop_device *vpdev, + struct mic_irq *cookie, void *data) +{ + struct imx_mic_driver *mdrv = g_mdrv; + int index = (unsigned long)cookie; + + imx_mic_intr_disable(mdrv, index); +} + +static void _imx_mic_ack_interrupt(struct vop_device *vpdev, int num) +{ + struct imx_mic_driver *mdrv = g_mdrv; + + imx_mic_intr_ack(mdrv, num); +} + +static int _imx_mic_next_db(struct vop_device *vpdev) +{ + struct imx_mic_driver *mdrv = g_mdrv; + static unsigned int i; + unsigned int db_index = MIC_CONFIG_DB; + + if (i == 0) + db_index = MIC_CONFIG_DB; + if (i == 1) + db_index = MIC_DATA_DB; + + i++; + if (i > 2) + dev_err(mdrv->dev, "doorbell cannot be trusted\n"); + + return db_index; +} + +static void __iomem *_imx_mic_get_remote_dp(struct vop_device *vpdev) +{ + struct imx_mic_driver *mdrv = g_mdrv; + struct imx_mic_device *mdev = &mdrv->mdev; + + return mdev->mmio.va; +} + +static void _imx_mic_send_intr(struct vop_device *vpdev, int db) +{ + struct imx_mic_driver *mdrv = g_mdrv; + struct imx_mic_epf *mepf = mdrv->mepf; + struct pci_epf *epf = mepf->epf; + struct pci_epc *epc = epf->epc; + + pci_epc_raise_irq(epc, epf->func_no, PCI_EPC_IRQ_MSI, MIC_PCI_MSI_INDEX); +} + +static void __iomem *_imx_mic_ioremap(struct vop_device *vpdev, + dma_addr_t pa, size_t len) +{ + struct imx_mic_driver *mdrv = g_mdrv; + struct imx_mic_device *mdev = &mdrv->mdev; + + /* Note: pa should be RC's absolute physical address */ + return (mdev->mmio.va + (pa - mdev->mmio.pa)); +} + +static void _imx_mic_iounmap(struct vop_device *vpdev, void __iomem *va) +{ + /* nothing to do */ +} + +static struct vop_hw_ops imx_mic_hw_ops = { + .request_irq = _imx_mic_request_irq, + .free_irq = _imx_mic_free_irq, + .ack_interrupt = _imx_mic_ack_interrupt, + .next_db = _imx_mic_next_db, + .get_remote_dp = _imx_mic_get_remote_dp, + .send_intr = _imx_mic_send_intr, + .remap = _imx_mic_ioremap, + .unmap = _imx_mic_iounmap, +}; + +static int __init imx_mic_driver_init(struct imx_mic_driver *mdrv) +{ + int ret; + + ret = imx_mic_intr_init(mdrv); + if (ret) { + dev_err(mdrv->dev, "imx_mic_intr_init failed\n"); + return ret; + } + + mdrv->vpdev = vop_register_device(mdrv->dev, VOP_DEV_TRNSP, + NULL, &imx_mic_hw_ops, 0, + NULL, NULL); + if (IS_ERR(mdrv->vpdev)) { + ret = PTR_ERR(mdrv->vpdev); + return ret; + } + + return 0; +} + +static void imx_mic_driver_uninit(struct imx_mic_driver *mdrv) +{ + vop_unregister_device(mdrv->vpdev); + imx_mic_intr_uninit(mdrv); +} + +int imx_mic_probe(struct imx_mic_epf *mic_epf) +{ + struct imx_mic_driver *mdrv; + struct imx_mic_device *mdev; + int ret; + + mdrv = devm_kzalloc(mic_epf->dev, sizeof(*mdrv), GFP_KERNEL); + if (!mdrv) + return -ENOMEM; + g_mdrv = mdrv; + mdev = &mdrv->mdev; + + mdrv->mepf = mic_epf; + mdrv->dev = mic_epf->dev; + snprintf(mdrv->name, sizeof(imx_mic_driver_name), imx_mic_driver_name); + + /* fetch reserved memory from rc side */ + mdev->mmio.pa = mic_epf->aper.rc_shmem_pa; + mdev->mmio.va = mic_epf->aper.pci_va; + mdev->mmio.len = mic_epf->aper.pci_len; + + ret = imx_mic_driver_init(mdrv); + if (ret) { + dev_err(mic_epf->dev, "imx_mic_driver_init failed\n"); + return ret; + } + + mdrv->vpdev->dev.dma_pfn_offset = (SWIOTLB_REGION_ADDR - mic_epf->aper.rc_map_addr) >> PAGE_SHIFT; + + return 0; +} +EXPORT_SYMBOL_GPL(imx_mic_probe); + +void imx_mic_remove(void) +{ + struct imx_mic_driver *mdrv = g_mdrv; + + imx_mic_driver_uninit(mdrv); +} +EXPORT_SYMBOL_GPL(imx_mic_remove); |