diff options
Diffstat (limited to 'drivers/misc/mei/hw-txe.c')
| -rw-r--r-- | drivers/misc/mei/hw-txe.c | 1107 |
1 files changed, 1107 insertions, 0 deletions
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c new file mode 100644 index 000000000000..f60182a52f96 --- /dev/null +++ b/drivers/misc/mei/hw-txe.c @@ -0,0 +1,1107 @@ +/* + * + * Intel Management Engine Interface (Intel MEI) Linux driver + * Copyright (c) 2013-2014, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + * + */ + +#include <linux/pci.h> +#include <linux/jiffies.h> +#include <linux/delay.h> +#include <linux/kthread.h> +#include <linux/irqreturn.h> + +#include <linux/mei.h> + +#include "mei_dev.h" +#include "hw-txe.h" +#include "client.h" +#include "hbm.h" + +/** + * mei_txe_reg_read - Reads 32bit data from the device + * + * @base_addr: registers base address + * @offset: register offset + * + */ +static inline u32 mei_txe_reg_read(void __iomem *base_addr, + unsigned long offset) +{ + return ioread32(base_addr + offset); +} + +/** + * mei_txe_reg_write - Writes 32bit data to the device + * + * @base_addr: registers base address + * @offset: register offset + * @value: the value to write + */ +static inline void mei_txe_reg_write(void __iomem *base_addr, + unsigned long offset, u32 value) +{ + iowrite32(value, base_addr + offset); +} + +/** + * mei_txe_sec_reg_read_silent - Reads 32bit data from the SeC BAR + * + * @dev: the device structure + * @offset: register offset + * + * Doesn't check for aliveness while Reads 32bit data from the SeC BAR + */ +static inline u32 mei_txe_sec_reg_read_silent(struct mei_txe_hw *hw, + unsigned long offset) +{ + return mei_txe_reg_read(hw->mem_addr[SEC_BAR], offset); +} + +/** + * mei_txe_sec_reg_read - Reads 32bit data from the SeC BAR + * + * @dev: the device structure + * @offset: register offset + * + * Reads 32bit data from the SeC BAR and shout loud if aliveness is not set + */ +static inline u32 mei_txe_sec_reg_read(struct mei_txe_hw *hw, + unsigned long offset) +{ + WARN(!hw->aliveness, "sec read: aliveness not asserted\n"); + return mei_txe_sec_reg_read_silent(hw, offset); +} +/** + * mei_txe_sec_reg_write_silent - Writes 32bit data to the SeC BAR + * doesn't check for aliveness + * + * @dev: the device structure + * @offset: register offset + * @value: value to write + * + * Doesn't check for aliveness while writes 32bit data from to the SeC BAR + */ +static inline void mei_txe_sec_reg_write_silent(struct mei_txe_hw *hw, + unsigned long offset, u32 value) +{ + mei_txe_reg_write(hw->mem_addr[SEC_BAR], offset, value); +} + +/** + * mei_txe_sec_reg_write - Writes 32bit data to the SeC BAR + * + * @dev: the device structure + * @offset: register offset + * @value: value to write + * + * Writes 32bit data from the SeC BAR and shout loud if aliveness is not set + */ +static inline void mei_txe_sec_reg_write(struct mei_txe_hw *hw, + unsigned long offset, u32 value) +{ + WARN(!hw->aliveness, "sec write: aliveness not asserted\n"); + mei_txe_sec_reg_write_silent(hw, offset, value); +} +/** + * mei_txe_br_reg_read - Reads 32bit data from the Bridge BAR + * + * @hw: the device structure + * @offset: offset from which to read the data + * + */ +static inline u32 mei_txe_br_reg_read(struct mei_txe_hw *hw, + unsigned long offset) +{ + return mei_txe_reg_read(hw->mem_addr[BRIDGE_BAR], offset); +} + +/** + * mei_txe_br_reg_write - Writes 32bit data to the Bridge BAR + * + * @hw: the device structure + * @offset: offset from which to write the data + * @value: the byte to write + */ +static inline void mei_txe_br_reg_write(struct mei_txe_hw *hw, + unsigned long offset, u32 value) +{ + mei_txe_reg_write(hw->mem_addr[BRIDGE_BAR], offset, value); +} + +/** + * mei_txe_aliveness_set - request for aliveness change + * + * @dev: the device structure + * @req: requested aliveness value + * + * Request for aliveness change and returns true if the change is + * really needed and false if aliveness is already + * in the requested state + * Requires device lock to be held + */ +static bool mei_txe_aliveness_set(struct mei_device *dev, u32 req) +{ + + struct mei_txe_hw *hw = to_txe_hw(dev); + bool do_req = hw->aliveness != req; + + dev_dbg(&dev->pdev->dev, "Aliveness current=%d request=%d\n", + hw->aliveness, req); + if (do_req) { + hw->recvd_aliveness = false; + mei_txe_br_reg_write(hw, SICR_HOST_ALIVENESS_REQ_REG, req); + } + return do_req; +} + + +/** + * mei_txe_aliveness_req_get - get aliveness requested register value + * + * @dev: the device structure + * + * Extract HICR_HOST_ALIVENESS_RESP_ACK bit from + * from HICR_HOST_ALIVENESS_REQ register value + */ +static u32 mei_txe_aliveness_req_get(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + u32 reg; + reg = mei_txe_br_reg_read(hw, SICR_HOST_ALIVENESS_REQ_REG); + return reg & SICR_HOST_ALIVENESS_REQ_REQUESTED; +} + +/** + * mei_txe_aliveness_get - get aliveness response register value + * @dev: the device structure + * + * Extract HICR_HOST_ALIVENESS_RESP_ACK bit + * from HICR_HOST_ALIVENESS_RESP register value + */ +static u32 mei_txe_aliveness_get(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + u32 reg; + reg = mei_txe_br_reg_read(hw, HICR_HOST_ALIVENESS_RESP_REG); + return reg & HICR_HOST_ALIVENESS_RESP_ACK; +} + +/** + * mei_txe_aliveness_poll - waits for aliveness to settle + * + * @dev: the device structure + * @expected: expected aliveness value + * + * Polls for HICR_HOST_ALIVENESS_RESP.ALIVENESS_RESP to be set + * returns > 0 if the expected value was received, -ETIME otherwise + */ +static int mei_txe_aliveness_poll(struct mei_device *dev, u32 expected) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + int t = 0; + + do { + hw->aliveness = mei_txe_aliveness_get(dev); + if (hw->aliveness == expected) { + dev_dbg(&dev->pdev->dev, + "aliveness settled after %d msecs\n", t); + return t; + } + mutex_unlock(&dev->device_lock); + msleep(MSEC_PER_SEC / 5); + mutex_lock(&dev->device_lock); + t += MSEC_PER_SEC / 5; + } while (t < SEC_ALIVENESS_WAIT_TIMEOUT); + + dev_err(&dev->pdev->dev, "aliveness timed out\n"); + return -ETIME; +} + +/** + * mei_txe_aliveness_wait - waits for aliveness to settle + * + * @dev: the device structure + * @expected: expected aliveness value + * + * Waits for HICR_HOST_ALIVENESS_RESP.ALIVENESS_RESP to be set + * returns returns 0 on success and < 0 otherwise + */ +static int mei_txe_aliveness_wait(struct mei_device *dev, u32 expected) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + const unsigned long timeout = + msecs_to_jiffies(SEC_ALIVENESS_WAIT_TIMEOUT); + long err; + int ret; + + hw->aliveness = mei_txe_aliveness_get(dev); + if (hw->aliveness == expected) + return 0; + + mutex_unlock(&dev->device_lock); + err = wait_event_timeout(hw->wait_aliveness, + hw->recvd_aliveness, timeout); + mutex_lock(&dev->device_lock); + + hw->aliveness = mei_txe_aliveness_get(dev); + ret = hw->aliveness == expected ? 0 : -ETIME; + + if (ret) + dev_err(&dev->pdev->dev, "aliveness timed out"); + else + dev_dbg(&dev->pdev->dev, "aliveness settled after %d msecs\n", + jiffies_to_msecs(timeout - err)); + hw->recvd_aliveness = false; + return ret; +} + +/** + * mei_txe_aliveness_set_sync - sets an wait for aliveness to complete + * + * @dev: the device structure + * + * returns returns 0 on success and < 0 otherwise + */ +int mei_txe_aliveness_set_sync(struct mei_device *dev, u32 req) +{ + if (mei_txe_aliveness_set(dev, req)) + return mei_txe_aliveness_wait(dev, req); + return 0; +} + +/** + * mei_txe_input_ready_interrupt_enable - sets the Input Ready Interrupt + * + * @dev: the device structure + */ +static void mei_txe_input_ready_interrupt_enable(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + u32 hintmsk; + /* Enable the SEC_IPC_HOST_INT_MASK_IN_RDY interrupt */ + hintmsk = mei_txe_sec_reg_read(hw, SEC_IPC_HOST_INT_MASK_REG); + hintmsk |= SEC_IPC_HOST_INT_MASK_IN_RDY; + mei_txe_sec_reg_write(hw, SEC_IPC_HOST_INT_MASK_REG, hintmsk); +} + +/** + * mei_txe_input_doorbell_set + * - Sets bit 0 in SEC_IPC_INPUT_DOORBELL.IPC_INPUT_DOORBELL. + * @dev: the device structure + */ +static void mei_txe_input_doorbell_set(struct mei_txe_hw *hw) +{ + /* Clear the interrupt cause */ + clear_bit(TXE_INTR_IN_READY_BIT, &hw->intr_cause); + mei_txe_sec_reg_write(hw, SEC_IPC_INPUT_DOORBELL_REG, 1); +} + +/** + * mei_txe_output_ready_set - Sets the SICR_SEC_IPC_OUTPUT_STATUS bit to 1 + * + * @dev: the device structure + */ +static void mei_txe_output_ready_set(struct mei_txe_hw *hw) +{ + mei_txe_br_reg_write(hw, + SICR_SEC_IPC_OUTPUT_STATUS_REG, + SEC_IPC_OUTPUT_STATUS_RDY); +} + +/** + * mei_txe_is_input_ready - check if TXE is ready for receiving data + * + * @dev: the device structure + */ +static bool mei_txe_is_input_ready(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + u32 status; + status = mei_txe_sec_reg_read(hw, SEC_IPC_INPUT_STATUS_REG); + return !!(SEC_IPC_INPUT_STATUS_RDY & status); +} + +/** + * mei_txe_intr_clear - clear all interrupts + * + * @dev: the device structure + */ +static inline void mei_txe_intr_clear(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + mei_txe_sec_reg_write_silent(hw, SEC_IPC_HOST_INT_STATUS_REG, + SEC_IPC_HOST_INT_STATUS_PENDING); + mei_txe_br_reg_write(hw, HISR_REG, HISR_INT_STS_MSK); + mei_txe_br_reg_write(hw, HHISR_REG, IPC_HHIER_MSK); +} + +/** + * mei_txe_intr_disable - disable all interrupts + * + * @dev: the device structure + */ +static void mei_txe_intr_disable(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + mei_txe_br_reg_write(hw, HHIER_REG, 0); + mei_txe_br_reg_write(hw, HIER_REG, 0); +} +/** + * mei_txe_intr_disable - enable all interrupts + * + * @dev: the device structure + */ +static void mei_txe_intr_enable(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + mei_txe_br_reg_write(hw, HHIER_REG, IPC_HHIER_MSK); + mei_txe_br_reg_write(hw, HIER_REG, HIER_INT_EN_MSK); +} + +/** + * mei_txe_pending_interrupts - check if there are pending interrupts + * only Aliveness, Input ready, and output doorbell are of relevance + * + * @dev: the device structure + * + * Checks if there are pending interrupts + * only Aliveness, Readiness, Input ready, and Output doorbell are relevant + */ +static bool mei_txe_pending_interrupts(struct mei_device *dev) +{ + + struct mei_txe_hw *hw = to_txe_hw(dev); + bool ret = (hw->intr_cause & (TXE_INTR_READINESS | + TXE_INTR_ALIVENESS | + TXE_INTR_IN_READY | + TXE_INTR_OUT_DB)); + + if (ret) { + dev_dbg(&dev->pdev->dev, + "Pending Interrupts InReady=%01d Readiness=%01d, Aliveness=%01d, OutDoor=%01d\n", + !!(hw->intr_cause & TXE_INTR_IN_READY), + !!(hw->intr_cause & TXE_INTR_READINESS), + !!(hw->intr_cause & TXE_INTR_ALIVENESS), + !!(hw->intr_cause & TXE_INTR_OUT_DB)); + } + return ret; +} + +/** + * mei_txe_input_payload_write - write a dword to the host buffer + * at offset idx + * + * @dev: the device structure + * @idx: index in the host buffer + * @value: value + */ +static void mei_txe_input_payload_write(struct mei_device *dev, + unsigned long idx, u32 value) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + mei_txe_sec_reg_write(hw, SEC_IPC_INPUT_PAYLOAD_REG + + (idx * sizeof(u32)), value); +} + +/** + * mei_txe_out_data_read - read dword from the device buffer + * at offset idx + * + * @dev: the device structure + * @idx: index in the device buffer + * + * returns register value at index + */ +static u32 mei_txe_out_data_read(const struct mei_device *dev, + unsigned long idx) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + return mei_txe_br_reg_read(hw, + BRIDGE_IPC_OUTPUT_PAYLOAD_REG + (idx * sizeof(u32))); +} + +/* Readiness */ + +/** + * mei_txe_readiness_set_host_rdy + * + * @dev: the device structure + */ +static void mei_txe_readiness_set_host_rdy(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + mei_txe_br_reg_write(hw, + SICR_HOST_IPC_READINESS_REQ_REG, + SICR_HOST_IPC_READINESS_HOST_RDY); +} + +/** + * mei_txe_readiness_clear + * + * @dev: the device structure + */ +static void mei_txe_readiness_clear(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + mei_txe_br_reg_write(hw, SICR_HOST_IPC_READINESS_REQ_REG, + SICR_HOST_IPC_READINESS_RDY_CLR); +} +/** + * mei_txe_readiness_get - Reads and returns + * the HICR_SEC_IPC_READINESS register value + * + * @dev: the device structure + */ +static u32 mei_txe_readiness_get(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + return mei_txe_br_reg_read(hw, HICR_SEC_IPC_READINESS_REG); +} + + +/** + * mei_txe_readiness_is_sec_rdy - check readiness + * for HICR_SEC_IPC_READINESS_SEC_RDY + * + * @readiness - cached readiness state + */ +static inline bool mei_txe_readiness_is_sec_rdy(u32 readiness) +{ + return !!(readiness & HICR_SEC_IPC_READINESS_SEC_RDY); +} + +/** + * mei_txe_hw_is_ready - check if the hw is ready + * + * @dev: the device structure + */ +static bool mei_txe_hw_is_ready(struct mei_device *dev) +{ + u32 readiness = mei_txe_readiness_get(dev); + return mei_txe_readiness_is_sec_rdy(readiness); +} + +/** + * mei_txe_host_is_ready - check if the host is ready + * + * @dev: the device structure + */ +static inline bool mei_txe_host_is_ready(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + u32 reg = mei_txe_br_reg_read(hw, HICR_SEC_IPC_READINESS_REG); + return !!(reg & HICR_SEC_IPC_READINESS_HOST_RDY); +} + +/** + * mei_txe_readiness_wait - wait till readiness settles + * + * @dev: the device structure + * + * returns 0 on success and -ETIME on timeout + */ +static int mei_txe_readiness_wait(struct mei_device *dev) +{ + if (mei_txe_hw_is_ready(dev)) + return 0; + + mutex_unlock(&dev->device_lock); + wait_event_timeout(dev->wait_hw_ready, dev->recvd_hw_ready, + msecs_to_jiffies(SEC_RESET_WAIT_TIMEOUT)); + mutex_lock(&dev->device_lock); + if (!dev->recvd_hw_ready) { + dev_err(&dev->pdev->dev, "wait for readiness failed\n"); + return -ETIME; + } + + dev->recvd_hw_ready = false; + return 0; +} + +/** + * mei_txe_hw_config - configure hardware at the start of the devices + * + * @dev: the device structure + * + * Configure hardware at the start of the device should be done only + * once at the device probe time + */ +static void mei_txe_hw_config(struct mei_device *dev) +{ + + struct mei_txe_hw *hw = to_txe_hw(dev); + /* Doesn't change in runtime */ + dev->hbuf_depth = PAYLOAD_SIZE / 4; + + hw->aliveness = mei_txe_aliveness_get(dev); + hw->readiness = mei_txe_readiness_get(dev); + + dev_dbg(&dev->pdev->dev, "aliveness_resp = 0x%08x, readiness = 0x%08x.\n", + hw->aliveness, hw->readiness); +} + + +/** + * mei_txe_write - writes a message to device. + * + * @dev: the device structure + * @header: header of message + * @buf: message buffer will be written + * returns 1 if success, 0 - otherwise. + */ + +static int mei_txe_write(struct mei_device *dev, + struct mei_msg_hdr *header, unsigned char *buf) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + unsigned long rem; + unsigned long length; + int slots = dev->hbuf_depth; + u32 *reg_buf = (u32 *)buf; + u32 dw_cnt; + int i; + + if (WARN_ON(!header || !buf)) + return -EINVAL; + + length = header->length; + + dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(header)); + + dw_cnt = mei_data2slots(length); + if (dw_cnt > slots) + return -EMSGSIZE; + + if (WARN(!hw->aliveness, "txe write: aliveness not asserted\n")) + return -EAGAIN; + + /* Enable Input Ready Interrupt. */ + mei_txe_input_ready_interrupt_enable(dev); + + if (!mei_txe_is_input_ready(dev)) { + dev_err(&dev->pdev->dev, "Input is not ready"); + return -EAGAIN; + } + + mei_txe_input_payload_write(dev, 0, *((u32 *)header)); + + for (i = 0; i < length / 4; i++) + mei_txe_input_payload_write(dev, i + 1, reg_buf[i]); + + rem = length & 0x3; + if (rem > 0) { + u32 reg = 0; + memcpy(®, &buf[length - rem], rem); + mei_txe_input_payload_write(dev, i + 1, reg); + } + + /* after each write the whole buffer is consumed */ + hw->slots = 0; + + /* Set Input-Doorbell */ + mei_txe_input_doorbell_set(hw); + + return 0; +} + +/** + * mei_txe_hbuf_max_len - mimics the me hbuf circular buffer + * + * @dev: the device structure + * + * returns the PAYLOAD_SIZE - 4 + */ +static size_t mei_txe_hbuf_max_len(const struct mei_device *dev) +{ + return PAYLOAD_SIZE - sizeof(struct mei_msg_hdr); +} + +/** + * mei_txe_hbuf_empty_slots - mimics the me hbuf circular buffer + * + * @dev: the device structure + * + * returns always hbuf_depth + */ +static int mei_txe_hbuf_empty_slots(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + return hw->slots; +} + +/** + * mei_txe_count_full_read_slots - mimics the me device circular buffer + * + * @dev: the device structure + * + * returns always buffer size in dwords count + */ +static int mei_txe_count_full_read_slots(struct mei_device *dev) +{ + /* read buffers has static size */ + return PAYLOAD_SIZE / 4; +} + +/** + * mei_txe_read_hdr - read message header which is always in 4 first bytes + * + * @dev: the device structure + * + * returns mei message header + */ + +static u32 mei_txe_read_hdr(const struct mei_device *dev) +{ + return mei_txe_out_data_read(dev, 0); +} +/** + * mei_txe_read - reads a message from the txe device. + * + * @dev: the device structure + * @buf: message buffer will be written + * @len: message size will be read + * + * returns -EINVAL on error wrong argument and 0 on success + */ +static int mei_txe_read(struct mei_device *dev, + unsigned char *buf, unsigned long len) +{ + + struct mei_txe_hw *hw = to_txe_hw(dev); + u32 i; + u32 *reg_buf = (u32 *)buf; + u32 rem = len & 0x3; + + if (WARN_ON(!buf || !len)) + return -EINVAL; + + dev_dbg(&dev->pdev->dev, + "buffer-length = %lu buf[0]0x%08X\n", + len, mei_txe_out_data_read(dev, 0)); + + for (i = 0; i < len / 4; i++) { + /* skip header: index starts from 1 */ + u32 reg = mei_txe_out_data_read(dev, i + 1); + dev_dbg(&dev->pdev->dev, "buf[%d] = 0x%08X\n", i, reg); + *reg_buf++ = reg; + } + + if (rem) { + u32 reg = mei_txe_out_data_read(dev, i + 1); + memcpy(reg_buf, ®, rem); + } + + mei_txe_output_ready_set(hw); + return 0; +} + +/** + * mei_txe_hw_reset - resets host and fw. + * + * @dev: the device structure + * @intr_enable: if interrupt should be enabled after reset. + * + * returns 0 on success and < 0 in case of error + */ +static int mei_txe_hw_reset(struct mei_device *dev, bool intr_enable) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + + u32 aliveness_req; + /* + * read input doorbell to ensure consistency between Bridge and SeC + * return value might be garbage return + */ + (void)mei_txe_sec_reg_read_silent(hw, SEC_IPC_INPUT_DOORBELL_REG); + + aliveness_req = mei_txe_aliveness_req_get(dev); + hw->aliveness = mei_txe_aliveness_get(dev); + + /* Disable interrupts in this stage we will poll */ + mei_txe_intr_disable(dev); + + /* + * If Aliveness Request and Aliveness Response are not equal then + * wait for them to be equal + * Since we might have interrupts disabled - poll for it + */ + if (aliveness_req != hw->aliveness) + if (mei_txe_aliveness_poll(dev, aliveness_req) < 0) { + dev_err(&dev->pdev->dev, + "wait for aliveness settle failed ... bailing out\n"); + return -EIO; + } + + /* + * If Aliveness Request and Aliveness Response are set then clear them + */ + if (aliveness_req) { + mei_txe_aliveness_set(dev, 0); + if (mei_txe_aliveness_poll(dev, 0) < 0) { + dev_err(&dev->pdev->dev, + "wait for aliveness failed ... bailing out\n"); + return -EIO; + } + } + + /* + * Set rediness RDY_CLR bit + */ + mei_txe_readiness_clear(dev); + + return 0; +} + +/** + * mei_txe_hw_start - start the hardware after reset + * + * @dev: the device structure + * + * returns 0 on success and < 0 in case of error + */ +static int mei_txe_hw_start(struct mei_device *dev) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + int ret; + + u32 hisr; + + /* bring back interrupts */ + mei_txe_intr_enable(dev); + + ret = mei_txe_readiness_wait(dev); + if (ret < 0) { + dev_err(&dev->pdev->dev, "wating for readiness failed\n"); + return ret; + } + + /* + * If HISR.INT2_STS interrupt status bit is set then clear it. + */ + hisr = mei_txe_br_reg_read(hw, HISR_REG); + if (hisr & HISR_INT_2_STS) + mei_txe_br_reg_write(hw, HISR_REG, HISR_INT_2_STS); + + /* Clear the interrupt cause of OutputDoorbell */ + clear_bit(TXE_INTR_OUT_DB_BIT, &hw->intr_cause); + + ret = mei_txe_aliveness_set_sync(dev, 1); + if (ret < 0) { + dev_err(&dev->pdev->dev, "wait for aliveness failed ... bailing out\n"); + return ret; + } + + /* enable input ready interrupts: + * SEC_IPC_HOST_INT_MASK.IPC_INPUT_READY_INT_MASK + */ + mei_txe_input_ready_interrupt_enable(dev); + + + /* Set the SICR_SEC_IPC_OUTPUT_STATUS.IPC_OUTPUT_READY bit */ + mei_txe_output_ready_set(hw); + + /* Set bit SICR_HOST_IPC_READINESS.HOST_RDY + */ + mei_txe_readiness_set_host_rdy(dev); + + return 0; +} + +/** + * mei_txe_check_and_ack_intrs - translate multi BAR interrupt into + * single bit mask and acknowledge the interrupts + * + * @dev: the device structure + * @do_ack: acknowledge interrupts + */ +static bool mei_txe_check_and_ack_intrs(struct mei_device *dev, bool do_ack) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + u32 hisr; + u32 hhisr; + u32 ipc_isr; + u32 aliveness; + bool generated; + + /* read interrupt registers */ + hhisr = mei_txe_br_reg_read(hw, HHISR_REG); + generated = (hhisr & IPC_HHIER_MSK); + if (!generated) + goto out; + + hisr = mei_txe_br_reg_read(hw, HISR_REG); + + aliveness = mei_txe_aliveness_get(dev); + if (hhisr & IPC_HHIER_SEC && aliveness) + ipc_isr = mei_txe_sec_reg_read_silent(hw, + SEC_IPC_HOST_INT_STATUS_REG); + else + ipc_isr = 0; + + generated = generated || + (hisr & HISR_INT_STS_MSK) || + (ipc_isr & SEC_IPC_HOST_INT_STATUS_PENDING); + + if (generated && do_ack) { + /* Save the interrupt causes */ + hw->intr_cause |= hisr & HISR_INT_STS_MSK; + if (ipc_isr & SEC_IPC_HOST_INT_STATUS_IN_RDY) + hw->intr_cause |= TXE_INTR_IN_READY; + + + mei_txe_intr_disable(dev); + /* Clear the interrupts in hierarchy: + * IPC and Bridge, than the High Level */ + mei_txe_sec_reg_write_silent(hw, + SEC_IPC_HOST_INT_STATUS_REG, ipc_isr); + mei_txe_br_reg_write(hw, HISR_REG, hisr); + mei_txe_br_reg_write(hw, HHISR_REG, hhisr); + } + +out: + return generated; +} + +/** + * mei_txe_irq_quick_handler - The ISR of the MEI device + * + * @irq: The irq number + * @dev_id: pointer to the device structure + * + * returns irqreturn_t + */ +irqreturn_t mei_txe_irq_quick_handler(int irq, void *dev_id) +{ + struct mei_device *dev = dev_id; + + if (mei_txe_check_and_ack_intrs(dev, true)) + return IRQ_WAKE_THREAD; + return IRQ_NONE; +} + + +/** + * mei_txe_irq_thread_handler - txe interrupt thread + * + * @irq: The irq number + * @dev_id: pointer to the device structure + * + * returns irqreturn_t + * + */ +irqreturn_t mei_txe_irq_thread_handler(int irq, void *dev_id) +{ + struct mei_device *dev = (struct mei_device *) dev_id; + struct mei_txe_hw *hw = to_txe_hw(dev); + struct mei_cl_cb complete_list; + s32 slots; + int rets = 0; + + dev_dbg(&dev->pdev->dev, "irq thread: Interrupt Registers HHISR|HISR|SEC=%02X|%04X|%02X\n", + mei_txe_br_reg_read(hw, HHISR_REG), + mei_txe_br_reg_read(hw, HISR_REG), + mei_txe_sec_reg_read_silent(hw, SEC_IPC_HOST_INT_STATUS_REG)); + + + /* initialize our complete list */ + mutex_lock(&dev->device_lock); + mei_io_list_init(&complete_list); + + if (pci_dev_msi_enabled(dev->pdev)) + mei_txe_check_and_ack_intrs(dev, true); + + /* show irq events */ + mei_txe_pending_interrupts(dev); + + hw->aliveness = mei_txe_aliveness_get(dev); + hw->readiness = mei_txe_readiness_get(dev); + + /* Readiness: + * Detection of TXE driver going through reset + * or TXE driver resetting the HECI interface. + */ + if (test_and_clear_bit(TXE_INTR_READINESS_BIT, &hw->intr_cause)) { + dev_dbg(&dev->pdev->dev, "Readiness Interrupt was received...\n"); + + /* Check if SeC is going through reset */ + if (mei_txe_readiness_is_sec_rdy(hw->readiness)) { + dev_dbg(&dev->pdev->dev, "we need to start the dev.\n"); + dev->recvd_hw_ready = true; + } else { + dev->recvd_hw_ready = false; + if (dev->dev_state != MEI_DEV_RESETTING) { + + dev_warn(&dev->pdev->dev, "FW not ready: resetting.\n"); + schedule_work(&dev->reset_work); + goto end; + + } + } + wake_up(&dev->wait_hw_ready); + } + + /************************************************************/ + /* Check interrupt cause: + * Aliveness: Detection of SeC acknowledge of host request that + * it remain alive or host cancellation of that request. + */ + + if (test_and_clear_bit(TXE_INTR_ALIVENESS_BIT, &hw->intr_cause)) { + /* Clear the interrupt cause */ + dev_dbg(&dev->pdev->dev, + "Aliveness Interrupt: Status: %d\n", hw->aliveness); + hw->recvd_aliveness = true; + if (waitqueue_active(&hw->wait_aliveness)) + wake_up(&hw->wait_aliveness); + } + + + /* Output Doorbell: + * Detection of SeC having sent output to host + */ + slots = mei_count_full_read_slots(dev); + if (test_and_clear_bit(TXE_INTR_OUT_DB_BIT, &hw->intr_cause)) { + /* Read from TXE */ + rets = mei_irq_read_handler(dev, &complete_list, &slots); + if (rets && dev->dev_state != MEI_DEV_RESETTING) { + dev_err(&dev->pdev->dev, + "mei_irq_read_handler ret = %d.\n", rets); + + schedule_work(&dev->reset_work); + goto end; + } + } + /* Input Ready: Detection if host can write to SeC */ + if (test_and_clear_bit(TXE_INTR_IN_READY_BIT, &hw->intr_cause)) { + dev->hbuf_is_ready = true; + hw->slots = dev->hbuf_depth; + } + + if (hw->aliveness && dev->hbuf_is_ready) { + /* get the real register value */ + dev->hbuf_is_ready = mei_hbuf_is_ready(dev); + rets = mei_irq_write_handler(dev, &complete_list); + if (rets && rets != -EMSGSIZE) + dev_err(&dev->pdev->dev, "mei_irq_write_handler ret = %d.\n", + rets); + dev->hbuf_is_ready = mei_hbuf_is_ready(dev); + } + + mei_irq_compl_handler(dev, &complete_list); + +end: + dev_dbg(&dev->pdev->dev, "interrupt thread end ret = %d\n", rets); + + mutex_unlock(&dev->device_lock); + + mei_enable_interrupts(dev); + return IRQ_HANDLED; +} + +static const struct mei_hw_ops mei_txe_hw_ops = { + + .host_is_ready = mei_txe_host_is_ready, + + .hw_is_ready = mei_txe_hw_is_ready, + .hw_reset = mei_txe_hw_reset, + .hw_config = mei_txe_hw_config, + .hw_start = mei_txe_hw_start, + + .intr_clear = mei_txe_intr_clear, + .intr_enable = mei_txe_intr_enable, + .intr_disable = mei_txe_intr_disable, + + .hbuf_free_slots = mei_txe_hbuf_empty_slots, + .hbuf_is_ready = mei_txe_is_input_ready, + .hbuf_max_len = mei_txe_hbuf_max_len, + + .write = mei_txe_write, + + .rdbuf_full_slots = mei_txe_count_full_read_slots, + .read_hdr = mei_txe_read_hdr, + + .read = mei_txe_read, + +}; + +/** + * mei_txe_dev_init - allocates and initializes txe hardware specific structure + * + * @pdev - pci device + * returns struct mei_device * on success or NULL; + * + */ +struct mei_device *mei_txe_dev_init(struct pci_dev *pdev) +{ + struct mei_device *dev; + struct mei_txe_hw *hw; + + dev = kzalloc(sizeof(struct mei_device) + + sizeof(struct mei_txe_hw), GFP_KERNEL); + if (!dev) + return NULL; + + mei_device_init(dev); + + hw = to_txe_hw(dev); + + init_waitqueue_head(&hw->wait_aliveness); + + dev->ops = &mei_txe_hw_ops; + + dev->pdev = pdev; + return dev; +} + +/** + * mei_txe_setup_satt2 - SATT2 configuration for DMA support. + * + * @dev: the device structure + * @addr: physical address start of the range + * @range: physical range size + */ +int mei_txe_setup_satt2(struct mei_device *dev, phys_addr_t addr, u32 range) +{ + struct mei_txe_hw *hw = to_txe_hw(dev); + + u32 lo32 = lower_32_bits(addr); + u32 hi32 = upper_32_bits(addr); + u32 ctrl; + + /* SATT is limited to 36 Bits */ + if (hi32 & ~0xF) + return -EINVAL; + + /* SATT has to be 16Byte aligned */ + if (lo32 & 0xF) + return -EINVAL; + + /* SATT range has to be 4Bytes aligned */ + if (range & 0x4) + return -EINVAL; + + /* SATT is limited to 32 MB range*/ + if (range > SATT_RANGE_MAX) + return -EINVAL; + + ctrl = SATT2_CTRL_VALID_MSK; + ctrl |= hi32 << SATT2_CTRL_BR_BASE_ADDR_REG_SHIFT; + + mei_txe_br_reg_write(hw, SATT2_SAP_SIZE_REG, range); + mei_txe_br_reg_write(hw, SATT2_BRG_BA_LSB_REG, lo32); + mei_txe_br_reg_write(hw, SATT2_CTRL_REG, ctrl); + dev_dbg(&dev->pdev->dev, "SATT2: SAP_SIZE_OFFSET=0x%08X, BRG_BA_LSB_OFFSET=0x%08X, CTRL_OFFSET=0x%08X\n", + range, lo32, ctrl); + + return 0; +} |