diff options
author | M Chetan Kumar <m.chetan.kumar@intel.com> | 2021-06-13 18:20:09 +0530 |
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committer | David S. Miller <davem@davemloft.net> | 2021-06-13 13:49:38 -0700 |
commit | 7f41ce085de0bada1e8c974cb3edd906ee49cb4c (patch) | |
tree | 68cac1a15abb555008aab031d5822a8f96493c98 /drivers/net/wwan | |
parent | 7e98d785ae6184c7580a33619dae8b651769ff08 (diff) | |
download | linux-7f41ce085de0bada1e8c974cb3edd906ee49cb4c.tar.bz2 |
net: iosm: irq handling
1) Request interrupt vector, frees allocated resource.
2) Registers IRQ handler.
Signed-off-by: M Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/wwan')
-rw-r--r-- | drivers/net/wwan/iosm/iosm_ipc_irq.c | 90 | ||||
-rw-r--r-- | drivers/net/wwan/iosm/iosm_ipc_irq.h | 33 |
2 files changed, 123 insertions, 0 deletions
diff --git a/drivers/net/wwan/iosm/iosm_ipc_irq.c b/drivers/net/wwan/iosm/iosm_ipc_irq.c new file mode 100644 index 000000000000..702f50a48151 --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_irq.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020-21 Intel Corporation. + */ + +#include "iosm_ipc_pcie.h" +#include "iosm_ipc_protocol.h" + +static void ipc_write_dbell_reg(struct iosm_pcie *ipc_pcie, int irq_n, u32 data) +{ + void __iomem *write_reg; + + /* Select the first doorbell register, which is only currently needed + * by CP. + */ + write_reg = (void __iomem *)((u8 __iomem *)ipc_pcie->ipc_regs + + ipc_pcie->doorbell_write + + (irq_n * ipc_pcie->doorbell_reg_offset)); + + /* Fire the doorbell irq by writing data on the doorbell write pointer + * register. + */ + iowrite32(data, write_reg); +} + +void ipc_doorbell_fire(struct iosm_pcie *ipc_pcie, int irq_n, u32 data) +{ + ipc_write_dbell_reg(ipc_pcie, irq_n, data); +} + +/* Threaded Interrupt handler for MSI interrupts */ +static irqreturn_t ipc_msi_interrupt(int irq, void *dev_id) +{ + struct iosm_pcie *ipc_pcie = dev_id; + int instance = irq - ipc_pcie->pci->irq; + + /* Shift the MSI irq actions to the IPC tasklet. IRQ_NONE means the + * irq was not from the IPC device or could not be served. + */ + if (instance >= ipc_pcie->nvec) + return IRQ_NONE; + + if (!test_bit(0, &ipc_pcie->suspend)) + ipc_imem_irq_process(ipc_pcie->imem, instance); + + return IRQ_HANDLED; +} + +void ipc_release_irq(struct iosm_pcie *ipc_pcie) +{ + struct pci_dev *pdev = ipc_pcie->pci; + + if (pdev->msi_enabled) { + while (--ipc_pcie->nvec >= 0) + free_irq(pdev->irq + ipc_pcie->nvec, ipc_pcie); + } + pci_free_irq_vectors(pdev); +} + +int ipc_acquire_irq(struct iosm_pcie *ipc_pcie) +{ + struct pci_dev *pdev = ipc_pcie->pci; + int i, rc = -EINVAL; + + ipc_pcie->nvec = pci_alloc_irq_vectors(pdev, IPC_MSI_VECTORS, + IPC_MSI_VECTORS, PCI_IRQ_MSI); + + if (ipc_pcie->nvec < 0) { + rc = ipc_pcie->nvec; + goto error; + } + + if (!pdev->msi_enabled) + goto error; + + for (i = 0; i < ipc_pcie->nvec; ++i) { + rc = request_threaded_irq(pdev->irq + i, NULL, + ipc_msi_interrupt, IRQF_ONESHOT, + KBUILD_MODNAME, ipc_pcie); + if (rc) { + dev_err(ipc_pcie->dev, "unable to grab IRQ, rc=%d", rc); + ipc_pcie->nvec = i; + ipc_release_irq(ipc_pcie); + goto error; + } + } + +error: + return rc; +} diff --git a/drivers/net/wwan/iosm/iosm_ipc_irq.h b/drivers/net/wwan/iosm/iosm_ipc_irq.h new file mode 100644 index 000000000000..a8ed596cb6a5 --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_irq.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0-only + * + * Copyright (C) 2020-21 Intel Corporation. + */ + +#ifndef IOSM_IPC_IRQ_H +#define IOSM_IPC_IRQ_H + +struct iosm_pcie; + +/** + * ipc_doorbell_fire - fire doorbell to CP + * @ipc_pcie: Pointer to iosm_pcie + * @irq_n: Doorbell type + * @data: ipc state + */ +void ipc_doorbell_fire(struct iosm_pcie *ipc_pcie, int irq_n, u32 data); + +/** + * ipc_release_irq - Release the IRQ handler. + * @ipc_pcie: Pointer to iosm_pcie struct + */ +void ipc_release_irq(struct iosm_pcie *ipc_pcie); + +/** + * ipc_acquire_irq - acquire IRQ & register IRQ handler. + * @ipc_pcie: Pointer to iosm_pcie struct + * + * Return: 0 on success and failure value on error + */ +int ipc_acquire_irq(struct iosm_pcie *ipc_pcie); + +#endif |