585 lines
16 KiB
C
585 lines
16 KiB
C
/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2013 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Intel MIC Host driver.
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*
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*/
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#include <linux/fs.h>
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#include <linux/pci.h>
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#include <linux/sched.h>
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#include <linux/firmware.h>
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#include <linux/delay.h>
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#include "../common/mic_dev.h"
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#include "mic_device.h"
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#include "mic_x100.h"
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#include "mic_smpt.h"
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/**
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* mic_x100_write_spad - write to the scratchpad register
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* @mdev: pointer to mic_device instance
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* @idx: index to the scratchpad register, 0 based
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* @val: the data value to put into the register
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*
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* This function allows writing of a 32bit value to the indexed scratchpad
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* register.
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*
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* RETURNS: none.
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*/
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static void
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mic_x100_write_spad(struct mic_device *mdev, unsigned int idx, u32 val)
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{
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dev_dbg(&mdev->pdev->dev, "Writing 0x%x to scratch pad index %d\n",
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val, idx);
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mic_mmio_write(&mdev->mmio, val,
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MIC_X100_SBOX_BASE_ADDRESS +
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MIC_X100_SBOX_SPAD0 + idx * 4);
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}
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/**
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* mic_x100_read_spad - read from the scratchpad register
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* @mdev: pointer to mic_device instance
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* @idx: index to scratchpad register, 0 based
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*
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* This function allows reading of the 32bit scratchpad register.
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*
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* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
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*/
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static u32
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mic_x100_read_spad(struct mic_device *mdev, unsigned int idx)
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{
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u32 val = mic_mmio_read(&mdev->mmio,
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MIC_X100_SBOX_BASE_ADDRESS +
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MIC_X100_SBOX_SPAD0 + idx * 4);
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dev_dbg(&mdev->pdev->dev,
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"Reading 0x%x from scratch pad index %d\n", val, idx);
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return val;
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}
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/**
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* mic_x100_enable_interrupts - Enable interrupts.
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* @mdev: pointer to mic_device instance
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*/
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static void mic_x100_enable_interrupts(struct mic_device *mdev)
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{
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u32 reg;
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struct mic_mw *mw = &mdev->mmio;
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u32 sice0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SICE0;
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u32 siac0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SIAC0;
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reg = mic_mmio_read(mw, sice0);
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reg |= MIC_X100_SBOX_DBR_BITS(0xf) | MIC_X100_SBOX_DMA_BITS(0xff);
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mic_mmio_write(mw, reg, sice0);
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/*
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* Enable auto-clear when enabling interrupts. Applicable only for
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* MSI-x. Legacy and MSI mode cannot have auto-clear enabled.
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*/
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if (mdev->irq_info.num_vectors > 1) {
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reg = mic_mmio_read(mw, siac0);
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reg |= MIC_X100_SBOX_DBR_BITS(0xf) |
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MIC_X100_SBOX_DMA_BITS(0xff);
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mic_mmio_write(mw, reg, siac0);
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}
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}
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/**
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* mic_x100_disable_interrupts - Disable interrupts.
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* @mdev: pointer to mic_device instance
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*/
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static void mic_x100_disable_interrupts(struct mic_device *mdev)
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{
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u32 reg;
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struct mic_mw *mw = &mdev->mmio;
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u32 sice0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SICE0;
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u32 siac0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SIAC0;
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u32 sicc0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SICC0;
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reg = mic_mmio_read(mw, sice0);
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mic_mmio_write(mw, reg, sicc0);
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if (mdev->irq_info.num_vectors > 1) {
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reg = mic_mmio_read(mw, siac0);
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reg &= ~(MIC_X100_SBOX_DBR_BITS(0xf) |
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MIC_X100_SBOX_DMA_BITS(0xff));
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mic_mmio_write(mw, reg, siac0);
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}
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}
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/**
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* mic_x100_send_sbox_intr - Send an MIC_X100_SBOX interrupt to MIC.
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* @mdev: pointer to mic_device instance
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*/
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static void mic_x100_send_sbox_intr(struct mic_device *mdev,
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int doorbell)
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{
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struct mic_mw *mw = &mdev->mmio;
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u64 apic_icr_offset = MIC_X100_SBOX_APICICR0 + doorbell * 8;
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u32 apicicr_low = mic_mmio_read(mw, MIC_X100_SBOX_BASE_ADDRESS +
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apic_icr_offset);
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/* for MIC we need to make sure we "hit" the send_icr bit (13) */
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apicicr_low = (apicicr_low | (1 << 13));
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/* Ensure that the interrupt is ordered w.r.t. previous stores. */
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wmb();
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mic_mmio_write(mw, apicicr_low,
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MIC_X100_SBOX_BASE_ADDRESS + apic_icr_offset);
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}
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/**
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* mic_x100_send_rdmasr_intr - Send an RDMASR interrupt to MIC.
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* @mdev: pointer to mic_device instance
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*/
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static void mic_x100_send_rdmasr_intr(struct mic_device *mdev,
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int doorbell)
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{
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int rdmasr_offset = MIC_X100_SBOX_RDMASR0 + (doorbell << 2);
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/* Ensure that the interrupt is ordered w.r.t. previous stores. */
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wmb();
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mic_mmio_write(&mdev->mmio, 0,
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MIC_X100_SBOX_BASE_ADDRESS + rdmasr_offset);
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}
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/**
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* __mic_x100_send_intr - Send interrupt to MIC.
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* @mdev: pointer to mic_device instance
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* @doorbell: doorbell number.
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*/
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static void mic_x100_send_intr(struct mic_device *mdev, int doorbell)
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{
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int rdmasr_db;
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if (doorbell < MIC_X100_NUM_SBOX_IRQ) {
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mic_x100_send_sbox_intr(mdev, doorbell);
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} else {
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rdmasr_db = doorbell - MIC_X100_NUM_SBOX_IRQ;
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mic_x100_send_rdmasr_intr(mdev, rdmasr_db);
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}
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}
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/**
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* mic_x100_ack_interrupt - Read the interrupt sources register and
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* clear it. This function will be called in the MSI/INTx case.
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* @mdev: Pointer to mic_device instance.
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*
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* Returns: bitmask of interrupt sources triggered.
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*/
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static u32 mic_x100_ack_interrupt(struct mic_device *mdev)
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{
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u32 sicr0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SICR0;
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u32 reg = mic_mmio_read(&mdev->mmio, sicr0);
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mic_mmio_write(&mdev->mmio, reg, sicr0);
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return reg;
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}
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/**
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* mic_x100_intr_workarounds - These hardware specific workarounds are
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* to be invoked everytime an interrupt is handled.
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* @mdev: Pointer to mic_device instance.
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*
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* Returns: none
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*/
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static void mic_x100_intr_workarounds(struct mic_device *mdev)
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{
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struct mic_mw *mw = &mdev->mmio;
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/* Clear pending bit array. */
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if (MIC_A0_STEP == mdev->stepping)
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mic_mmio_write(mw, 1, MIC_X100_SBOX_BASE_ADDRESS +
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MIC_X100_SBOX_MSIXPBACR);
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if (mdev->stepping >= MIC_B0_STEP)
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mdev->intr_ops->enable_interrupts(mdev);
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}
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/**
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* mic_x100_hw_intr_init - Initialize h/w specific interrupt
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* information.
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* @mdev: pointer to mic_device instance
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*/
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static void mic_x100_hw_intr_init(struct mic_device *mdev)
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{
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mdev->intr_info = (struct mic_intr_info *)mic_x100_intr_init;
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}
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/**
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* mic_x100_read_msi_to_src_map - read from the MSI mapping registers
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* @mdev: pointer to mic_device instance
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* @idx: index to the mapping register, 0 based
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*
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* This function allows reading of the 32bit MSI mapping register.
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*
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* RETURNS: The value in the register.
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*/
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static u32
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mic_x100_read_msi_to_src_map(struct mic_device *mdev, int idx)
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{
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return mic_mmio_read(&mdev->mmio,
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MIC_X100_SBOX_BASE_ADDRESS +
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MIC_X100_SBOX_MXAR0 + idx * 4);
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}
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/**
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* mic_x100_program_msi_to_src_map - program the MSI mapping registers
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* @mdev: pointer to mic_device instance
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* @idx: index to the mapping register, 0 based
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* @offset: The bit offset in the register that needs to be updated.
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* @set: boolean specifying if the bit in the specified offset needs
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* to be set or cleared.
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*
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* RETURNS: None.
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*/
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static void
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mic_x100_program_msi_to_src_map(struct mic_device *mdev,
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int idx, int offset, bool set)
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{
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unsigned long reg;
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struct mic_mw *mw = &mdev->mmio;
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u32 mxar = MIC_X100_SBOX_BASE_ADDRESS +
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MIC_X100_SBOX_MXAR0 + idx * 4;
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reg = mic_mmio_read(mw, mxar);
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if (set)
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__set_bit(offset, ®);
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else
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__clear_bit(offset, ®);
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mic_mmio_write(mw, reg, mxar);
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}
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/*
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* mic_x100_reset_fw_ready - Reset Firmware ready status field.
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* @mdev: pointer to mic_device instance
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*/
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static void mic_x100_reset_fw_ready(struct mic_device *mdev)
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{
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mdev->ops->write_spad(mdev, MIC_X100_DOWNLOAD_INFO, 0);
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}
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/*
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* mic_x100_is_fw_ready - Check if firmware is ready.
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* @mdev: pointer to mic_device instance
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*/
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static bool mic_x100_is_fw_ready(struct mic_device *mdev)
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{
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u32 scratch2 = mdev->ops->read_spad(mdev, MIC_X100_DOWNLOAD_INFO);
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return MIC_X100_SPAD2_DOWNLOAD_STATUS(scratch2) ? true : false;
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}
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/**
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* mic_x100_get_apic_id - Get bootstrap APIC ID.
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* @mdev: pointer to mic_device instance
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*/
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static u32 mic_x100_get_apic_id(struct mic_device *mdev)
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{
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u32 scratch2 = 0;
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scratch2 = mdev->ops->read_spad(mdev, MIC_X100_DOWNLOAD_INFO);
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return MIC_X100_SPAD2_APIC_ID(scratch2);
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}
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/**
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* mic_x100_send_firmware_intr - Send an interrupt to the firmware on MIC.
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* @mdev: pointer to mic_device instance
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*/
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static void mic_x100_send_firmware_intr(struct mic_device *mdev)
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{
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u32 apicicr_low;
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u64 apic_icr_offset = MIC_X100_SBOX_APICICR7;
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int vector = MIC_X100_BSP_INTERRUPT_VECTOR;
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struct mic_mw *mw = &mdev->mmio;
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/*
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* For MIC we need to make sure we "hit"
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* the send_icr bit (13).
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*/
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apicicr_low = (vector | (1 << 13));
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mic_mmio_write(mw, mic_x100_get_apic_id(mdev),
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MIC_X100_SBOX_BASE_ADDRESS + apic_icr_offset + 4);
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/* Ensure that the interrupt is ordered w.r.t. previous stores. */
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wmb();
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mic_mmio_write(mw, apicicr_low,
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MIC_X100_SBOX_BASE_ADDRESS + apic_icr_offset);
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}
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/**
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* mic_x100_hw_reset - Reset the MIC device.
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* @mdev: pointer to mic_device instance
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*/
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static void mic_x100_hw_reset(struct mic_device *mdev)
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{
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u32 reset_reg;
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u32 rgcr = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_RGCR;
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struct mic_mw *mw = &mdev->mmio;
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/* Ensure that the reset is ordered w.r.t. previous loads and stores */
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mb();
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/* Trigger reset */
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reset_reg = mic_mmio_read(mw, rgcr);
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reset_reg |= 0x1;
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mic_mmio_write(mw, reset_reg, rgcr);
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/*
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* It seems we really want to delay at least 1 second
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* after touching reset to prevent a lot of problems.
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*/
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msleep(1000);
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}
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/**
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* mic_x100_load_command_line - Load command line to MIC.
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* @mdev: pointer to mic_device instance
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* @fw: the firmware image
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*
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* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
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*/
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static int
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mic_x100_load_command_line(struct mic_device *mdev, const struct firmware *fw)
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{
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u32 len = 0;
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u32 boot_mem;
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char *buf;
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void __iomem *cmd_line_va = mdev->aper.va + mdev->bootaddr + fw->size;
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#define CMDLINE_SIZE 2048
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boot_mem = mdev->aper.len >> 20;
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buf = kzalloc(CMDLINE_SIZE, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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len += snprintf(buf, CMDLINE_SIZE - len,
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" mem=%dM", boot_mem);
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if (mdev->cosm_dev->cmdline)
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snprintf(buf + len, CMDLINE_SIZE - len, " %s",
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mdev->cosm_dev->cmdline);
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memcpy_toio(cmd_line_va, buf, strlen(buf) + 1);
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kfree(buf);
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return 0;
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}
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/**
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* mic_x100_load_ramdisk - Load ramdisk to MIC.
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* @mdev: pointer to mic_device instance
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*
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* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
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*/
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static int
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mic_x100_load_ramdisk(struct mic_device *mdev)
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{
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const struct firmware *fw;
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int rc;
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struct boot_params __iomem *bp = mdev->aper.va + mdev->bootaddr;
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rc = request_firmware(&fw, mdev->cosm_dev->ramdisk, &mdev->pdev->dev);
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if (rc < 0) {
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dev_err(&mdev->pdev->dev,
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"ramdisk request_firmware failed: %d %s\n",
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rc, mdev->cosm_dev->ramdisk);
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goto error;
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}
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/*
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* Typically the bootaddr for card OS is 64M
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* so copy over the ramdisk @ 128M.
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*/
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memcpy_toio(mdev->aper.va + (mdev->bootaddr << 1), fw->data, fw->size);
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iowrite32(mdev->bootaddr << 1, &bp->hdr.ramdisk_image);
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iowrite32(fw->size, &bp->hdr.ramdisk_size);
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release_firmware(fw);
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error:
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return rc;
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}
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/**
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* mic_x100_get_boot_addr - Get MIC boot address.
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* @mdev: pointer to mic_device instance
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*
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* This function is called during firmware load to determine
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* the address at which the OS should be downloaded in card
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* memory i.e. GDDR.
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* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
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*/
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static int
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mic_x100_get_boot_addr(struct mic_device *mdev)
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{
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u32 scratch2, boot_addr;
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int rc = 0;
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scratch2 = mdev->ops->read_spad(mdev, MIC_X100_DOWNLOAD_INFO);
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boot_addr = MIC_X100_SPAD2_DOWNLOAD_ADDR(scratch2);
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dev_dbg(&mdev->pdev->dev, "%s %d boot_addr 0x%x\n",
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__func__, __LINE__, boot_addr);
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if (boot_addr > (1 << 31)) {
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dev_err(&mdev->pdev->dev,
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"incorrect bootaddr 0x%x\n",
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boot_addr);
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rc = -EINVAL;
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goto error;
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}
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mdev->bootaddr = boot_addr;
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error:
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return rc;
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}
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/**
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* mic_x100_load_firmware - Load firmware to MIC.
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* @mdev: pointer to mic_device instance
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* @buf: buffer containing boot string including firmware/ramdisk path.
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*
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* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
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*/
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static int
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mic_x100_load_firmware(struct mic_device *mdev, const char *buf)
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{
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int rc;
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const struct firmware *fw;
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rc = mic_x100_get_boot_addr(mdev);
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if (rc)
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return rc;
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/* load OS */
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rc = request_firmware(&fw, mdev->cosm_dev->firmware, &mdev->pdev->dev);
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if (rc < 0) {
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dev_err(&mdev->pdev->dev,
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"ramdisk request_firmware failed: %d %s\n",
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rc, mdev->cosm_dev->firmware);
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return rc;
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}
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if (mdev->bootaddr > mdev->aper.len - fw->size) {
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rc = -EINVAL;
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dev_err(&mdev->pdev->dev, "%s %d rc %d bootaddr 0x%x\n",
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__func__, __LINE__, rc, mdev->bootaddr);
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goto error;
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}
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memcpy_toio(mdev->aper.va + mdev->bootaddr, fw->data, fw->size);
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mdev->ops->write_spad(mdev, MIC_X100_FW_SIZE, fw->size);
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if (!strcmp(mdev->cosm_dev->bootmode, "flash")) {
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rc = -EINVAL;
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dev_err(&mdev->pdev->dev, "%s %d rc %d\n",
|
|
__func__, __LINE__, rc);
|
|
goto error;
|
|
}
|
|
/* load command line */
|
|
rc = mic_x100_load_command_line(mdev, fw);
|
|
if (rc) {
|
|
dev_err(&mdev->pdev->dev, "%s %d rc %d\n",
|
|
__func__, __LINE__, rc);
|
|
goto error;
|
|
}
|
|
release_firmware(fw);
|
|
/* load ramdisk */
|
|
if (mdev->cosm_dev->ramdisk)
|
|
rc = mic_x100_load_ramdisk(mdev);
|
|
|
|
return rc;
|
|
|
|
error:
|
|
release_firmware(fw);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* mic_x100_get_postcode - Get postcode status from firmware.
|
|
* @mdev: pointer to mic_device instance
|
|
*
|
|
* RETURNS: postcode.
|
|
*/
|
|
static u32 mic_x100_get_postcode(struct mic_device *mdev)
|
|
{
|
|
return mic_mmio_read(&mdev->mmio, MIC_X100_POSTCODE);
|
|
}
|
|
|
|
/**
|
|
* mic_x100_smpt_set - Update an SMPT entry with a DMA address.
|
|
* @mdev: pointer to mic_device instance
|
|
*
|
|
* RETURNS: none.
|
|
*/
|
|
static void
|
|
mic_x100_smpt_set(struct mic_device *mdev, dma_addr_t dma_addr, u8 index)
|
|
{
|
|
#define SNOOP_ON (0 << 0)
|
|
#define SNOOP_OFF (1 << 0)
|
|
/*
|
|
* Sbox Smpt Reg Bits:
|
|
* Bits 31:2 Host address
|
|
* Bits 1 RSVD
|
|
* Bits 0 No snoop
|
|
*/
|
|
#define BUILD_SMPT(NO_SNOOP, HOST_ADDR) \
|
|
(u32)(((HOST_ADDR) << 2) | ((NO_SNOOP) & 0x01))
|
|
|
|
uint32_t smpt_reg_val = BUILD_SMPT(SNOOP_ON,
|
|
dma_addr >> mdev->smpt->info.page_shift);
|
|
mic_mmio_write(&mdev->mmio, smpt_reg_val,
|
|
MIC_X100_SBOX_BASE_ADDRESS +
|
|
MIC_X100_SBOX_SMPT00 + (4 * index));
|
|
}
|
|
|
|
/**
|
|
* mic_x100_smpt_hw_init - Initialize SMPT X100 specific fields.
|
|
* @mdev: pointer to mic_device instance
|
|
*
|
|
* RETURNS: none.
|
|
*/
|
|
static void mic_x100_smpt_hw_init(struct mic_device *mdev)
|
|
{
|
|
struct mic_smpt_hw_info *info = &mdev->smpt->info;
|
|
|
|
info->num_reg = 32;
|
|
info->page_shift = 34;
|
|
info->page_size = (1ULL << info->page_shift);
|
|
info->base = 0x8000000000ULL;
|
|
}
|
|
|
|
struct mic_smpt_ops mic_x100_smpt_ops = {
|
|
.init = mic_x100_smpt_hw_init,
|
|
.set = mic_x100_smpt_set,
|
|
};
|
|
|
|
static bool mic_x100_dma_filter(struct dma_chan *chan, void *param)
|
|
{
|
|
if (chan->device->dev->parent == (struct device *)param)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
struct mic_hw_ops mic_x100_ops = {
|
|
.aper_bar = MIC_X100_APER_BAR,
|
|
.mmio_bar = MIC_X100_MMIO_BAR,
|
|
.read_spad = mic_x100_read_spad,
|
|
.write_spad = mic_x100_write_spad,
|
|
.send_intr = mic_x100_send_intr,
|
|
.ack_interrupt = mic_x100_ack_interrupt,
|
|
.intr_workarounds = mic_x100_intr_workarounds,
|
|
.reset = mic_x100_hw_reset,
|
|
.reset_fw_ready = mic_x100_reset_fw_ready,
|
|
.is_fw_ready = mic_x100_is_fw_ready,
|
|
.send_firmware_intr = mic_x100_send_firmware_intr,
|
|
.load_mic_fw = mic_x100_load_firmware,
|
|
.get_postcode = mic_x100_get_postcode,
|
|
.dma_filter = mic_x100_dma_filter,
|
|
};
|
|
|
|
struct mic_hw_intr_ops mic_x100_intr_ops = {
|
|
.intr_init = mic_x100_hw_intr_init,
|
|
.enable_interrupts = mic_x100_enable_interrupts,
|
|
.disable_interrupts = mic_x100_disable_interrupts,
|
|
.program_msi_to_src_map = mic_x100_program_msi_to_src_map,
|
|
.read_msi_to_src_map = mic_x100_read_msi_to_src_map,
|
|
};
|