diff options
Diffstat (limited to 'drivers/misc/mei/hw-me.c')
| -rw-r--r-- | drivers/misc/mei/hw-me.c | 705 |
1 files changed, 602 insertions, 103 deletions
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index 94b203ec9b1..6a2d272cea4 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -15,61 +15,66 @@ */ #include <linux/pci.h> -#include <linux/mei.h> + +#include <linux/kthread.h> +#include <linux/interrupt.h> #include "mei_dev.h" +#include "hbm.h" + #include "hw-me.h" +#include "hw-me-regs.h" /** - * mei_reg_read - Reads 32bit data from the mei device + * mei_me_reg_read - Reads 32bit data from the mei device * * @dev: the device structure * @offset: offset from which to read the data * * returns register value (u32) */ -static inline u32 mei_reg_read(const struct mei_device *dev, +static inline u32 mei_me_reg_read(const struct mei_me_hw *hw, unsigned long offset) { - return ioread32(dev->mem_addr + offset); + return ioread32(hw->mem_addr + offset); } /** - * mei_reg_write - Writes 32bit data to the mei device + * mei_me_reg_write - Writes 32bit data to the mei device * * @dev: the device structure * @offset: offset from which to write the data * @value: register value to write (u32) */ -static inline void mei_reg_write(const struct mei_device *dev, +static inline void mei_me_reg_write(const struct mei_me_hw *hw, unsigned long offset, u32 value) { - iowrite32(value, dev->mem_addr + offset); + iowrite32(value, hw->mem_addr + offset); } /** - * mei_mecbrw_read - Reads 32bit data from ME circular buffer + * mei_me_mecbrw_read - Reads 32bit data from ME circular buffer * read window register * * @dev: the device structure * * returns ME_CB_RW register value (u32) */ -u32 mei_mecbrw_read(const struct mei_device *dev) +static u32 mei_me_mecbrw_read(const struct mei_device *dev) { - return mei_reg_read(dev, ME_CB_RW); + return mei_me_reg_read(to_me_hw(dev), ME_CB_RW); } /** - * mei_mecsr_read - Reads 32bit data from the ME CSR + * mei_me_mecsr_read - Reads 32bit data from the ME CSR * * @dev: the device structure * * returns ME_CSR_HA register value (u32) */ -static inline u32 mei_mecsr_read(const struct mei_device *dev) +static inline u32 mei_me_mecsr_read(const struct mei_me_hw *hw) { - return mei_reg_read(dev, ME_CSR_HA); + return mei_me_reg_read(hw, ME_CSR_HA); } /** @@ -79,9 +84,9 @@ static inline u32 mei_mecsr_read(const struct mei_device *dev) * * returns H_CSR register value (u32) */ -static inline u32 mei_hcsr_read(const struct mei_device *dev) +static inline u32 mei_hcsr_read(const struct mei_me_hw *hw) { - return mei_reg_read(dev, H_CSR); + return mei_me_reg_read(hw, H_CSR); } /** @@ -90,46 +95,64 @@ static inline u32 mei_hcsr_read(const struct mei_device *dev) * * @dev: the device structure */ -static inline void mei_hcsr_set(struct mei_device *dev, u32 hcsr) +static inline void mei_hcsr_set(struct mei_me_hw *hw, u32 hcsr) { hcsr &= ~H_IS; - mei_reg_write(dev, H_CSR, hcsr); + mei_me_reg_write(hw, H_CSR, hcsr); } /** - * me_hw_config - configure hw dependent settings + * mei_me_hw_config - configure hw dependent settings * * @dev: mei device */ -void mei_hw_config(struct mei_device *dev) +static void mei_me_hw_config(struct mei_device *dev) { - u32 hcsr = mei_hcsr_read(dev); + struct mei_me_hw *hw = to_me_hw(dev); + u32 hcsr = mei_hcsr_read(to_me_hw(dev)); /* Doesn't change in runtime */ dev->hbuf_depth = (hcsr & H_CBD) >> 24; + + hw->pg_state = MEI_PG_OFF; } + +/** + * mei_me_pg_state - translate internal pg state + * to the mei power gating state + * + * @hw - me hardware + * returns: MEI_PG_OFF if aliveness is on and MEI_PG_ON otherwise + */ +static inline enum mei_pg_state mei_me_pg_state(struct mei_device *dev) +{ + struct mei_me_hw *hw = to_me_hw(dev); + return hw->pg_state; +} + /** * mei_clear_interrupts - clear and stop interrupts * * @dev: the device structure */ -void mei_clear_interrupts(struct mei_device *dev) +static void mei_me_intr_clear(struct mei_device *dev) { - u32 hcsr = mei_hcsr_read(dev); + struct mei_me_hw *hw = to_me_hw(dev); + u32 hcsr = mei_hcsr_read(hw); if ((hcsr & H_IS) == H_IS) - mei_reg_write(dev, H_CSR, hcsr); + mei_me_reg_write(hw, H_CSR, hcsr); } - /** - * mei_enable_interrupts - enables mei device interrupts + * mei_me_intr_enable - enables mei device interrupts * * @dev: the device structure */ -void mei_enable_interrupts(struct mei_device *dev) +static void mei_me_intr_enable(struct mei_device *dev) { - u32 hcsr = mei_hcsr_read(dev); + struct mei_me_hw *hw = to_me_hw(dev); + u32 hcsr = mei_hcsr_read(hw); hcsr |= H_IE; - mei_hcsr_set(dev, hcsr); + mei_hcsr_set(hw, hcsr); } /** @@ -137,102 +160,143 @@ void mei_enable_interrupts(struct mei_device *dev) * * @dev: the device structure */ -void mei_disable_interrupts(struct mei_device *dev) +static void mei_me_intr_disable(struct mei_device *dev) { - u32 hcsr = mei_hcsr_read(dev); + struct mei_me_hw *hw = to_me_hw(dev); + u32 hcsr = mei_hcsr_read(hw); hcsr &= ~H_IE; - mei_hcsr_set(dev, hcsr); + mei_hcsr_set(hw, hcsr); } /** - * mei_hw_reset - resets fw via mei csr register. + * mei_me_hw_reset_release - release device from the reset * * @dev: the device structure - * @interrupts_enabled: if interrupt should be enabled after reset. */ -void mei_hw_reset(struct mei_device *dev, bool intr_enable) +static void mei_me_hw_reset_release(struct mei_device *dev) { - u32 hcsr = mei_hcsr_read(dev); + struct mei_me_hw *hw = to_me_hw(dev); + u32 hcsr = mei_hcsr_read(hw); - dev_dbg(&dev->pdev->dev, "before reset HCSR = 0x%08x.\n", hcsr); + hcsr |= H_IG; + hcsr &= ~H_RST; + mei_hcsr_set(hw, hcsr); - hcsr |= (H_RST | H_IG); + /* complete this write before we set host ready on another CPU */ + mmiowb(); +} +/** + * mei_me_hw_reset - resets fw via mei csr register. + * + * @dev: the device structure + * @intr_enable: if interrupt should be enabled after reset. + */ +static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable) +{ + struct mei_me_hw *hw = to_me_hw(dev); + u32 hcsr = mei_hcsr_read(hw); + + hcsr |= H_RST | H_IG | H_IS; if (intr_enable) hcsr |= H_IE; else hcsr &= ~H_IE; - mei_hcsr_set(dev, hcsr); + dev->recvd_hw_ready = false; + mei_me_reg_write(hw, H_CSR, hcsr); - hcsr = mei_hcsr_read(dev) | H_IG; - hcsr &= ~H_RST; + /* + * Host reads the H_CSR once to ensure that the + * posted write to H_CSR completes. + */ + hcsr = mei_hcsr_read(hw); + + if ((hcsr & H_RST) == 0) + dev_warn(&dev->pdev->dev, "H_RST is not set = 0x%08X", hcsr); - mei_hcsr_set(dev, hcsr); + if ((hcsr & H_RDY) == H_RDY) + dev_warn(&dev->pdev->dev, "H_RDY is not cleared 0x%08X", hcsr); - hcsr = mei_hcsr_read(dev); + if (intr_enable == false) + mei_me_hw_reset_release(dev); - dev_dbg(&dev->pdev->dev, "current HCSR = 0x%08x.\n", hcsr); + return 0; } /** - * mei_host_set_ready - enable device + * mei_me_host_set_ready - enable device * * @dev - mei device * returns bool */ -void mei_host_set_ready(struct mei_device *dev) +static void mei_me_host_set_ready(struct mei_device *dev) { - dev->host_hw_state |= H_IE | H_IG | H_RDY; - mei_hcsr_set(dev, dev->host_hw_state); + struct mei_me_hw *hw = to_me_hw(dev); + hw->host_hw_state = mei_hcsr_read(hw); + hw->host_hw_state |= H_IE | H_IG | H_RDY; + mei_hcsr_set(hw, hw->host_hw_state); } /** - * mei_host_is_ready - check whether the host has turned ready + * mei_me_host_is_ready - check whether the host has turned ready * * @dev - mei device * returns bool */ -bool mei_host_is_ready(struct mei_device *dev) +static bool mei_me_host_is_ready(struct mei_device *dev) { - dev->host_hw_state = mei_hcsr_read(dev); - return (dev->host_hw_state & H_RDY) == H_RDY; + struct mei_me_hw *hw = to_me_hw(dev); + hw->host_hw_state = mei_hcsr_read(hw); + return (hw->host_hw_state & H_RDY) == H_RDY; } /** - * mei_me_is_ready - check whether the me has turned ready + * mei_me_hw_is_ready - check whether the me(hw) has turned ready * * @dev - mei device * returns bool */ -bool mei_me_is_ready(struct mei_device *dev) +static bool mei_me_hw_is_ready(struct mei_device *dev) { - dev->me_hw_state = mei_mecsr_read(dev); - return (dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA; + struct mei_me_hw *hw = to_me_hw(dev); + hw->me_hw_state = mei_me_mecsr_read(hw); + return (hw->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA; } -/** - * mei_interrupt_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_interrupt_quick_handler(int irq, void *dev_id) +static int mei_me_hw_ready_wait(struct mei_device *dev) { - struct mei_device *dev = (struct mei_device *) dev_id; - u32 csr_reg = mei_hcsr_read(dev); + int err; + + mutex_unlock(&dev->device_lock); + err = wait_event_interruptible_timeout(dev->wait_hw_ready, + dev->recvd_hw_ready, + mei_secs_to_jiffies(MEI_HW_READY_TIMEOUT)); + mutex_lock(&dev->device_lock); + if (!err && !dev->recvd_hw_ready) { + if (!err) + err = -ETIME; + dev_err(&dev->pdev->dev, + "wait hw ready failed. status = %d\n", err); + return err; + } - if ((csr_reg & H_IS) != H_IS) - return IRQ_NONE; + dev->recvd_hw_ready = false; + return 0; +} - /* clear H_IS bit in H_CSR */ - mei_reg_write(dev, H_CSR, csr_reg); +static int mei_me_hw_start(struct mei_device *dev) +{ + int ret = mei_me_hw_ready_wait(dev); + if (ret) + return ret; + dev_dbg(&dev->pdev->dev, "hw is ready\n"); - return IRQ_WAKE_THREAD; + mei_me_host_set_ready(dev); + return ret; } + /** * mei_hbuf_filled_slots - gets number of device filled buffer slots * @@ -242,36 +306,37 @@ irqreturn_t mei_interrupt_quick_handler(int irq, void *dev_id) */ static unsigned char mei_hbuf_filled_slots(struct mei_device *dev) { + struct mei_me_hw *hw = to_me_hw(dev); char read_ptr, write_ptr; - dev->host_hw_state = mei_hcsr_read(dev); + hw->host_hw_state = mei_hcsr_read(hw); - read_ptr = (char) ((dev->host_hw_state & H_CBRP) >> 8); - write_ptr = (char) ((dev->host_hw_state & H_CBWP) >> 16); + read_ptr = (char) ((hw->host_hw_state & H_CBRP) >> 8); + write_ptr = (char) ((hw->host_hw_state & H_CBWP) >> 16); return (unsigned char) (write_ptr - read_ptr); } /** - * mei_hbuf_is_empty - checks if host buffer is empty. + * mei_me_hbuf_is_empty - checks if host buffer is empty. * * @dev: the device structure * * returns true if empty, false - otherwise. */ -bool mei_hbuf_is_empty(struct mei_device *dev) +static bool mei_me_hbuf_is_empty(struct mei_device *dev) { return mei_hbuf_filled_slots(dev) == 0; } /** - * mei_hbuf_empty_slots - counts write empty slots. + * mei_me_hbuf_empty_slots - counts write empty slots. * * @dev: the device structure * - * returns -1(ESLOTS_OVERFLOW) if overflow, otherwise empty slots count + * returns -EOVERFLOW if overflow, otherwise empty slots count */ -int mei_hbuf_empty_slots(struct mei_device *dev) +static int mei_me_hbuf_empty_slots(struct mei_device *dev) { unsigned char filled_slots, empty_slots; @@ -285,8 +350,14 @@ int mei_hbuf_empty_slots(struct mei_device *dev) return empty_slots; } +static size_t mei_me_hbuf_max_len(const struct mei_device *dev) +{ + return dev->hbuf_depth * sizeof(u32) - sizeof(struct mei_msg_hdr); +} + + /** - * mei_write_message - writes a message to mei device. + * mei_me_write_message - writes a message to mei device. * * @dev: the device structure * @header: mei HECI header of message @@ -294,13 +365,16 @@ int mei_hbuf_empty_slots(struct mei_device *dev) * * This function returns -EIO if write has failed */ -int mei_write_message(struct mei_device *dev, struct mei_msg_hdr *header, - unsigned char *buf) +static int mei_me_write_message(struct mei_device *dev, + struct mei_msg_hdr *header, + unsigned char *buf) { - unsigned long rem, dw_cnt; + struct mei_me_hw *hw = to_me_hw(dev); + unsigned long rem; unsigned long length = header->length; u32 *reg_buf = (u32 *)buf; u32 hcsr; + u32 dw_cnt; int i; int empty_slots; @@ -311,44 +385,45 @@ int mei_write_message(struct mei_device *dev, struct mei_msg_hdr *header, dw_cnt = mei_data2slots(length); if (empty_slots < 0 || dw_cnt > empty_slots) - return -EIO; + return -EMSGSIZE; - mei_reg_write(dev, H_CB_WW, *((u32 *) header)); + mei_me_reg_write(hw, H_CB_WW, *((u32 *) header)); for (i = 0; i < length / 4; i++) - mei_reg_write(dev, H_CB_WW, reg_buf[i]); + mei_me_reg_write(hw, H_CB_WW, reg_buf[i]); rem = length & 0x3; if (rem > 0) { u32 reg = 0; memcpy(®, &buf[length - rem], rem); - mei_reg_write(dev, H_CB_WW, reg); + mei_me_reg_write(hw, H_CB_WW, reg); } - hcsr = mei_hcsr_read(dev) | H_IG; - mei_hcsr_set(dev, hcsr); - if (!mei_me_is_ready(dev)) + hcsr = mei_hcsr_read(hw) | H_IG; + mei_hcsr_set(hw, hcsr); + if (!mei_me_hw_is_ready(dev)) return -EIO; return 0; } /** - * mei_count_full_read_slots - counts read full slots. + * mei_me_count_full_read_slots - counts read full slots. * * @dev: the device structure * - * returns -1(ESLOTS_OVERFLOW) if overflow, otherwise filled slots count + * returns -EOVERFLOW if overflow, otherwise filled slots count */ -int mei_count_full_read_slots(struct mei_device *dev) +static int mei_me_count_full_read_slots(struct mei_device *dev) { + struct mei_me_hw *hw = to_me_hw(dev); char read_ptr, write_ptr; unsigned char buffer_depth, filled_slots; - dev->me_hw_state = mei_mecsr_read(dev); - buffer_depth = (unsigned char)((dev->me_hw_state & ME_CBD_HRA) >> 24); - read_ptr = (char) ((dev->me_hw_state & ME_CBRP_HRA) >> 8); - write_ptr = (char) ((dev->me_hw_state & ME_CBWP_HRA) >> 16); + hw->me_hw_state = mei_me_mecsr_read(hw); + buffer_depth = (unsigned char)((hw->me_hw_state & ME_CBD_HRA) >> 24); + read_ptr = (char) ((hw->me_hw_state & ME_CBRP_HRA) >> 8); + write_ptr = (char) ((hw->me_hw_state & ME_CBWP_HRA) >> 16); filled_slots = (unsigned char) (write_ptr - read_ptr); /* check for overflow */ @@ -360,27 +435,451 @@ int mei_count_full_read_slots(struct mei_device *dev) } /** - * mei_read_slots - reads a message from mei device. + * mei_me_read_slots - reads a message from mei device. * * @dev: the device structure * @buffer: message buffer will be written * @buffer_length: message size will be read */ -void mei_read_slots(struct mei_device *dev, unsigned char *buffer, +static int mei_me_read_slots(struct mei_device *dev, unsigned char *buffer, unsigned long buffer_length) { + struct mei_me_hw *hw = to_me_hw(dev); u32 *reg_buf = (u32 *)buffer; u32 hcsr; for (; buffer_length >= sizeof(u32); buffer_length -= sizeof(u32)) - *reg_buf++ = mei_mecbrw_read(dev); + *reg_buf++ = mei_me_mecbrw_read(dev); if (buffer_length > 0) { - u32 reg = mei_mecbrw_read(dev); + u32 reg = mei_me_mecbrw_read(dev); memcpy(reg_buf, ®, buffer_length); } - hcsr = mei_hcsr_read(dev) | H_IG; - mei_hcsr_set(dev, hcsr); + hcsr = mei_hcsr_read(hw) | H_IG; + mei_hcsr_set(hw, hcsr); + return 0; +} + +/** + * mei_me_pg_enter - write pg enter register to mei device. + * + * @dev: the device structure + */ +static void mei_me_pg_enter(struct mei_device *dev) +{ + struct mei_me_hw *hw = to_me_hw(dev); + u32 reg = mei_me_reg_read(hw, H_HPG_CSR); + reg |= H_HPG_CSR_PGI; + mei_me_reg_write(hw, H_HPG_CSR, reg); +} + +/** + * mei_me_pg_enter - write pg enter register to mei device. + * + * @dev: the device structure + */ +static void mei_me_pg_exit(struct mei_device *dev) +{ + struct mei_me_hw *hw = to_me_hw(dev); + u32 reg = mei_me_reg_read(hw, H_HPG_CSR); + + WARN(!(reg & H_HPG_CSR_PGI), "PGI is not set\n"); + + reg |= H_HPG_CSR_PGIHEXR; + mei_me_reg_write(hw, H_HPG_CSR, reg); +} + +/** + * mei_me_pg_set_sync - perform pg entry procedure + * + * @dev: the device structure + * + * returns 0 on success an error code otherwise + */ +int mei_me_pg_set_sync(struct mei_device *dev) +{ + struct mei_me_hw *hw = to_me_hw(dev); + unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT); + int ret; + + dev->pg_event = MEI_PG_EVENT_WAIT; + + ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_ENTRY_REQ_CMD); + if (ret) + return ret; + + mutex_unlock(&dev->device_lock); + wait_event_timeout(dev->wait_pg, + dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout); + mutex_lock(&dev->device_lock); + + if (dev->pg_event == MEI_PG_EVENT_RECEIVED) { + mei_me_pg_enter(dev); + ret = 0; + } else { + ret = -ETIME; + } + + dev->pg_event = MEI_PG_EVENT_IDLE; + hw->pg_state = MEI_PG_ON; + + return ret; +} + +/** + * mei_me_pg_unset_sync - perform pg exit procedure + * + * @dev: the device structure + * + * returns 0 on success an error code otherwise + */ +int mei_me_pg_unset_sync(struct mei_device *dev) +{ + struct mei_me_hw *hw = to_me_hw(dev); + unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT); + int ret; + + if (dev->pg_event == MEI_PG_EVENT_RECEIVED) + goto reply; + + dev->pg_event = MEI_PG_EVENT_WAIT; + + mei_me_pg_exit(dev); + + mutex_unlock(&dev->device_lock); + wait_event_timeout(dev->wait_pg, + dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout); + mutex_lock(&dev->device_lock); + +reply: + if (dev->pg_event == MEI_PG_EVENT_RECEIVED) + ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_EXIT_RES_CMD); + else + ret = -ETIME; + + dev->pg_event = MEI_PG_EVENT_IDLE; + hw->pg_state = MEI_PG_OFF; + + return ret; +} + +/** + * mei_me_pg_is_enabled - detect if PG is supported by HW + * + * @dev: the device structure + * + * returns: true is pg supported, false otherwise + */ +static bool mei_me_pg_is_enabled(struct mei_device *dev) +{ + struct mei_me_hw *hw = to_me_hw(dev); + u32 reg = mei_me_reg_read(hw, ME_CSR_HA); + + if ((reg & ME_PGIC_HRA) == 0) + goto notsupported; + + if (dev->version.major_version < HBM_MAJOR_VERSION_PGI) + goto notsupported; + + if (dev->version.major_version == HBM_MAJOR_VERSION_PGI && + dev->version.minor_version < HBM_MINOR_VERSION_PGI) + goto notsupported; + + return true; + +notsupported: + dev_dbg(&dev->pdev->dev, "pg: not supported: HGP = %d hbm version %d.%d ?= %d.%d\n", + !!(reg & ME_PGIC_HRA), + dev->version.major_version, + dev->version.minor_version, + HBM_MAJOR_VERSION_PGI, + HBM_MINOR_VERSION_PGI); + + return false; +} + +/** + * mei_me_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_me_irq_quick_handler(int irq, void *dev_id) +{ + struct mei_device *dev = (struct mei_device *) dev_id; + struct mei_me_hw *hw = to_me_hw(dev); + u32 csr_reg = mei_hcsr_read(hw); + + if ((csr_reg & H_IS) != H_IS) + return IRQ_NONE; + + /* clear H_IS bit in H_CSR */ + mei_me_reg_write(hw, H_CSR, csr_reg); + + return IRQ_WAKE_THREAD; +} + +/** + * mei_me_irq_thread_handler - function called after ISR to handle the interrupt + * processing. + * + * @irq: The irq number + * @dev_id: pointer to the device structure + * + * returns irqreturn_t + * + */ +irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id) +{ + struct mei_device *dev = (struct mei_device *) dev_id; + struct mei_cl_cb complete_list; + s32 slots; + int rets = 0; + + dev_dbg(&dev->pdev->dev, "function called after ISR to handle the interrupt processing.\n"); + /* initialize our complete list */ + mutex_lock(&dev->device_lock); + mei_io_list_init(&complete_list); + + /* Ack the interrupt here + * In case of MSI we don't go through the quick handler */ + if (pci_dev_msi_enabled(dev->pdev)) + mei_clear_interrupts(dev); + + /* check if ME wants a reset */ + if (!mei_hw_is_ready(dev) && dev->dev_state != MEI_DEV_RESETTING) { + dev_warn(&dev->pdev->dev, "FW not ready: resetting.\n"); + schedule_work(&dev->reset_work); + goto end; + } + + /* check if we need to start the dev */ + if (!mei_host_is_ready(dev)) { + if (mei_hw_is_ready(dev)) { + mei_me_hw_reset_release(dev); + dev_dbg(&dev->pdev->dev, "we need to start the dev.\n"); + + dev->recvd_hw_ready = true; + wake_up_interruptible(&dev->wait_hw_ready); + } else { + dev_dbg(&dev->pdev->dev, "Spurious Interrupt\n"); + } + goto end; + } + /* check slots available for reading */ + slots = mei_count_full_read_slots(dev); + while (slots > 0) { + dev_dbg(&dev->pdev->dev, "slots to read = %08x\n", slots); + rets = mei_irq_read_handler(dev, &complete_list, &slots); + /* There is a race between ME write and interrupt delivery: + * Not all data is always available immediately after the + * interrupt, so try to read again on the next interrupt. + */ + if (rets == -ENODATA) + break; + + 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; + } + } + + dev->hbuf_is_ready = mei_hbuf_is_ready(dev); + + /* + * During PG handshake only allowed write is the replay to the + * PG exit message, so block calling write function + * if the pg state is not idle + */ + if (dev->pg_event == MEI_PG_EVENT_IDLE) { + rets = mei_irq_write_handler(dev, &complete_list); + 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); + return IRQ_HANDLED; +} + +/** + * mei_me_fw_status - retrieve fw status from the pci config space + * + * @dev: the device structure + * @fw_status: fw status registers storage + * + * returns 0 on success an error code otherwise + */ +static int mei_me_fw_status(struct mei_device *dev, + struct mei_fw_status *fw_status) +{ + const u32 pci_cfg_reg[] = {PCI_CFG_HFS_1, PCI_CFG_HFS_2}; + int i; + + if (!fw_status) + return -EINVAL; + + switch (dev->pdev->device) { + case MEI_DEV_ID_IBXPK_1: + case MEI_DEV_ID_IBXPK_2: + case MEI_DEV_ID_CPT_1: + case MEI_DEV_ID_PBG_1: + case MEI_DEV_ID_PPT_1: + case MEI_DEV_ID_PPT_2: + case MEI_DEV_ID_PPT_3: + case MEI_DEV_ID_LPT_H: + case MEI_DEV_ID_LPT_W: + case MEI_DEV_ID_LPT_LP: + case MEI_DEV_ID_LPT_HR: + case MEI_DEV_ID_WPT_LP: + fw_status->count = 2; + break; + case MEI_DEV_ID_ICH10_1: + case MEI_DEV_ID_ICH10_2: + case MEI_DEV_ID_ICH10_3: + case MEI_DEV_ID_ICH10_4: + fw_status->count = 1; + break; + default: + fw_status->count = 0; + break; + } + + for (i = 0; i < fw_status->count && i < MEI_FW_STATUS_MAX; i++) { + int ret; + ret = pci_read_config_dword(dev->pdev, + pci_cfg_reg[i], &fw_status->status[i]); + if (ret) + return ret; + } + return 0; +} + +static const struct mei_hw_ops mei_me_hw_ops = { + + .pg_state = mei_me_pg_state, + + .fw_status = mei_me_fw_status, + .host_is_ready = mei_me_host_is_ready, + + .hw_is_ready = mei_me_hw_is_ready, + .hw_reset = mei_me_hw_reset, + .hw_config = mei_me_hw_config, + .hw_start = mei_me_hw_start, + + .pg_is_enabled = mei_me_pg_is_enabled, + + .intr_clear = mei_me_intr_clear, + .intr_enable = mei_me_intr_enable, + .intr_disable = mei_me_intr_disable, + + .hbuf_free_slots = mei_me_hbuf_empty_slots, + .hbuf_is_ready = mei_me_hbuf_is_empty, + .hbuf_max_len = mei_me_hbuf_max_len, + + .write = mei_me_write_message, + + .rdbuf_full_slots = mei_me_count_full_read_slots, + .read_hdr = mei_me_mecbrw_read, + .read = mei_me_read_slots +}; + +static bool mei_me_fw_type_nm(struct pci_dev *pdev) +{ + u32 reg; + pci_read_config_dword(pdev, PCI_CFG_HFS_2, ®); + /* make sure that bit 9 (NM) is up and bit 10 (DM) is down */ + return (reg & 0x600) == 0x200; +} + +#define MEI_CFG_FW_NM \ + .quirk_probe = mei_me_fw_type_nm + +static bool mei_me_fw_type_sps(struct pci_dev *pdev) +{ + u32 reg; + /* Read ME FW Status check for SPS Firmware */ + pci_read_config_dword(pdev, PCI_CFG_HFS_1, ®); + /* if bits [19:16] = 15, running SPS Firmware */ + return (reg & 0xf0000) == 0xf0000; +} + +#define MEI_CFG_FW_SPS \ + .quirk_probe = mei_me_fw_type_sps + + +#define MEI_CFG_LEGACY_HFS \ + .fw_status.count = 0 + +#define MEI_CFG_ICH_HFS \ + .fw_status.count = 1, \ + .fw_status.status[0] = PCI_CFG_HFS_1 + +#define MEI_CFG_PCH_HFS \ + .fw_status.count = 2, \ + .fw_status.status[0] = PCI_CFG_HFS_1, \ + .fw_status.status[1] = PCI_CFG_HFS_2 + + +/* ICH Legacy devices */ +const struct mei_cfg mei_me_legacy_cfg = { + MEI_CFG_LEGACY_HFS, +}; + +/* ICH devices */ +const struct mei_cfg mei_me_ich_cfg = { + MEI_CFG_ICH_HFS, +}; + +/* PCH devices */ +const struct mei_cfg mei_me_pch_cfg = { + MEI_CFG_PCH_HFS, +}; + + +/* PCH Cougar Point and Patsburg with quirk for Node Manager exclusion */ +const struct mei_cfg mei_me_pch_cpt_pbg_cfg = { + MEI_CFG_PCH_HFS, + MEI_CFG_FW_NM, +}; + +/* PCH Lynx Point with quirk for SPS Firmware exclusion */ +const struct mei_cfg mei_me_lpt_cfg = { + MEI_CFG_PCH_HFS, + MEI_CFG_FW_SPS, +}; + +/** + * mei_me_dev_init - allocates and initializes the mei device structure + * + * @pdev: The pci device structure + * @cfg: per device generation config + * + * returns The mei_device_device pointer on success, NULL on failure. + */ +struct mei_device *mei_me_dev_init(struct pci_dev *pdev, + const struct mei_cfg *cfg) +{ + struct mei_device *dev; + + dev = kzalloc(sizeof(struct mei_device) + + sizeof(struct mei_me_hw), GFP_KERNEL); + if (!dev) + return NULL; + + mei_device_init(dev, cfg); + + dev->ops = &mei_me_hw_ops; + + dev->pdev = pdev; + return dev; } |