| /* |
| * NVEC: NVIDIA compliant embedded controller interface |
| * |
| * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.lauchpad.net> |
| * |
| * Authors: Pierre-Hugues Husson <phhusson@free.fr> |
| * Ilya Petrov <ilya.muromec@gmail.com> |
| * Marc Dietrich <marvin24@gmx.de> |
| * Julian Andres Klode <jak@jak-linux.org> |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| */ |
| |
| /* #define DEBUG */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/atomic.h> |
| #include <linux/clk.h> |
| #include <linux/completion.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/gpio.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/irq.h> |
| #include <linux/of.h> |
| #include <linux/of_gpio.h> |
| #include <linux/list.h> |
| #include <linux/mfd/core.h> |
| #include <linux/mutex.h> |
| #include <linux/notifier.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/workqueue.h> |
| #include <linux/clk/tegra.h> |
| |
| #include "nvec.h" |
| |
| #define I2C_CNFG 0x00 |
| #define I2C_CNFG_PACKET_MODE_EN (1<<10) |
| #define I2C_CNFG_NEW_MASTER_SFM (1<<11) |
| #define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12 |
| |
| #define I2C_SL_CNFG 0x20 |
| #define I2C_SL_NEWSL (1<<2) |
| #define I2C_SL_NACK (1<<1) |
| #define I2C_SL_RESP (1<<0) |
| #define I2C_SL_IRQ (1<<3) |
| #define END_TRANS (1<<4) |
| #define RCVD (1<<2) |
| #define RNW (1<<1) |
| |
| #define I2C_SL_RCVD 0x24 |
| #define I2C_SL_STATUS 0x28 |
| #define I2C_SL_ADDR1 0x2c |
| #define I2C_SL_ADDR2 0x30 |
| #define I2C_SL_DELAY_COUNT 0x3c |
| |
| /** |
| * enum nvec_msg_category - Message categories for nvec_msg_alloc() |
| * @NVEC_MSG_RX: The message is an incoming message (from EC) |
| * @NVEC_MSG_TX: The message is an outgoing message (to EC) |
| */ |
| enum nvec_msg_category { |
| NVEC_MSG_RX, |
| NVEC_MSG_TX, |
| }; |
| |
| enum nvec_sleep_subcmds { |
| GLOBAL_EVENTS, |
| AP_PWR_DOWN, |
| AP_SUSPEND, |
| }; |
| |
| #define CNF_EVENT_REPORTING 0x01 |
| #define GET_FIRMWARE_VERSION 0x15 |
| #define LID_SWITCH BIT(1) |
| #define PWR_BUTTON BIT(15) |
| |
| static struct nvec_chip *nvec_power_handle; |
| |
| static const struct mfd_cell nvec_devices[] = { |
| { |
| .name = "nvec-kbd", |
| .id = 1, |
| }, |
| { |
| .name = "nvec-mouse", |
| .id = 1, |
| }, |
| { |
| .name = "nvec-power", |
| .id = 1, |
| }, |
| { |
| .name = "nvec-power", |
| .id = 2, |
| }, |
| { |
| .name = "nvec-paz00", |
| .id = 1, |
| }, |
| }; |
| |
| /** |
| * nvec_register_notifier - Register a notifier with nvec |
| * @nvec: A &struct nvec_chip |
| * @nb: The notifier block to register |
| * |
| * Registers a notifier with @nvec. The notifier will be added to an atomic |
| * notifier chain that is called for all received messages except those that |
| * correspond to a request initiated by nvec_write_sync(). |
| */ |
| int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, |
| unsigned int events) |
| { |
| return atomic_notifier_chain_register(&nvec->notifier_list, nb); |
| } |
| EXPORT_SYMBOL_GPL(nvec_register_notifier); |
| |
| /** |
| * nvec_unregister_notifier - Unregister a notifier with nvec |
| * @nvec: A &struct nvec_chip |
| * @nb: The notifier block to unregister |
| * |
| * Unregisters a notifier with @nvec. The notifier will be removed from the |
| * atomic notifier chain. |
| */ |
| int nvec_unregister_notifier(struct nvec_chip *nvec, struct notifier_block *nb) |
| { |
| return atomic_notifier_chain_unregister(&nvec->notifier_list, nb); |
| } |
| EXPORT_SYMBOL_GPL(nvec_unregister_notifier); |
| |
| /** |
| * nvec_status_notifier - The final notifier |
| * |
| * Prints a message about control events not handled in the notifier |
| * chain. |
| */ |
| static int nvec_status_notifier(struct notifier_block *nb, |
| unsigned long event_type, void *data) |
| { |
| struct nvec_chip *nvec = container_of(nb, struct nvec_chip, |
| nvec_status_notifier); |
| unsigned char *msg = (unsigned char *)data; |
| |
| if (event_type != NVEC_CNTL) |
| return NOTIFY_DONE; |
| |
| dev_warn(nvec->dev, "unhandled msg type %ld\n", event_type); |
| print_hex_dump(KERN_WARNING, "payload: ", DUMP_PREFIX_NONE, 16, 1, |
| msg, msg[1] + 2, true); |
| |
| return NOTIFY_OK; |
| } |
| |
| /** |
| * nvec_msg_alloc: |
| * @nvec: A &struct nvec_chip |
| * @category: Pool category, see &enum nvec_msg_category |
| * |
| * Allocate a single &struct nvec_msg object from the message pool of |
| * @nvec. The result shall be passed to nvec_msg_free() if no longer |
| * used. |
| * |
| * Outgoing messages are placed in the upper 75% of the pool, keeping the |
| * lower 25% available for RX buffers only. The reason is to prevent a |
| * situation where all buffers are full and a message is thus endlessly |
| * retried because the response could never be processed. |
| */ |
| static struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec, |
| enum nvec_msg_category category) |
| { |
| int i = (category == NVEC_MSG_TX) ? (NVEC_POOL_SIZE / 4) : 0; |
| |
| for (; i < NVEC_POOL_SIZE; i++) { |
| if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { |
| dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); |
| return &nvec->msg_pool[i]; |
| } |
| } |
| |
| dev_err(nvec->dev, "could not allocate %s buffer\n", |
| (category == NVEC_MSG_TX) ? "TX" : "RX"); |
| |
| return NULL; |
| } |
| |
| /** |
| * nvec_msg_free: |
| * @nvec: A &struct nvec_chip |
| * @msg: A message (must be allocated by nvec_msg_alloc() and belong to @nvec) |
| * |
| * Free the given message |
| */ |
| void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) |
| { |
| if (msg != &nvec->tx_scratch) |
| dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); |
| atomic_set(&msg->used, 0); |
| } |
| EXPORT_SYMBOL_GPL(nvec_msg_free); |
| |
| /** |
| * nvec_msg_is_event - Return %true if @msg is an event |
| * @msg: A message |
| */ |
| static bool nvec_msg_is_event(struct nvec_msg *msg) |
| { |
| return msg->data[0] >> 7; |
| } |
| |
| /** |
| * nvec_msg_size - Get the size of a message |
| * @msg: The message to get the size for |
| * |
| * This only works for received messages, not for outgoing messages. |
| */ |
| static size_t nvec_msg_size(struct nvec_msg *msg) |
| { |
| bool is_event = nvec_msg_is_event(msg); |
| int event_length = (msg->data[0] & 0x60) >> 5; |
| |
| /* for variable size, payload size in byte 1 + count (1) + cmd (1) */ |
| if (!is_event || event_length == NVEC_VAR_SIZE) |
| return (msg->pos || msg->size) ? (msg->data[1] + 2) : 0; |
| else if (event_length == NVEC_2BYTES) |
| return 2; |
| else if (event_length == NVEC_3BYTES) |
| return 3; |
| else |
| return 0; |
| } |
| |
| /** |
| * nvec_gpio_set_value - Set the GPIO value |
| * @nvec: A &struct nvec_chip |
| * @value: The value to write (0 or 1) |
| * |
| * Like gpio_set_value(), but generating debugging information |
| */ |
| static void nvec_gpio_set_value(struct nvec_chip *nvec, int value) |
| { |
| dev_dbg(nvec->dev, "GPIO changed from %u to %u\n", |
| gpio_get_value(nvec->gpio), value); |
| gpio_set_value(nvec->gpio, value); |
| } |
| |
| /** |
| * nvec_write_async - Asynchronously write a message to NVEC |
| * @nvec: An nvec_chip instance |
| * @data: The message data, starting with the request type |
| * @size: The size of @data |
| * |
| * Queue a single message to be transferred to the embedded controller |
| * and return immediately. |
| * |
| * Returns: 0 on success, a negative error code on failure. If a failure |
| * occured, the nvec driver may print an error. |
| */ |
| int nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, |
| short size) |
| { |
| struct nvec_msg *msg; |
| unsigned long flags; |
| |
| msg = nvec_msg_alloc(nvec, NVEC_MSG_TX); |
| |
| if (msg == NULL) |
| return -ENOMEM; |
| |
| msg->data[0] = size; |
| memcpy(msg->data + 1, data, size); |
| msg->size = size + 1; |
| |
| spin_lock_irqsave(&nvec->tx_lock, flags); |
| list_add_tail(&msg->node, &nvec->tx_data); |
| spin_unlock_irqrestore(&nvec->tx_lock, flags); |
| |
| schedule_work(&nvec->tx_work); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(nvec_write_async); |
| |
| /** |
| * nvec_write_sync - Write a message to nvec and read the response |
| * @nvec: An &struct nvec_chip |
| * @data: The data to write |
| * @size: The size of @data |
| * |
| * This is similar to nvec_write_async(), but waits for the |
| * request to be answered before returning. This function |
| * uses a mutex and can thus not be called from e.g. |
| * interrupt handlers. |
| * |
| * Returns: A pointer to the response message on success, |
| * %NULL on failure. Free with nvec_msg_free() once no longer |
| * used. |
| */ |
| struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, |
| const unsigned char *data, short size) |
| { |
| struct nvec_msg *msg; |
| |
| mutex_lock(&nvec->sync_write_mutex); |
| |
| nvec->sync_write_pending = (data[1] << 8) + data[0]; |
| |
| if (nvec_write_async(nvec, data, size) < 0) { |
| mutex_unlock(&nvec->sync_write_mutex); |
| return NULL; |
| } |
| |
| dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", |
| nvec->sync_write_pending); |
| if (!(wait_for_completion_timeout(&nvec->sync_write, |
| msecs_to_jiffies(2000)))) { |
| dev_warn(nvec->dev, "timeout waiting for sync write to complete\n"); |
| mutex_unlock(&nvec->sync_write_mutex); |
| return NULL; |
| } |
| |
| dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); |
| |
| msg = nvec->last_sync_msg; |
| |
| mutex_unlock(&nvec->sync_write_mutex); |
| |
| return msg; |
| } |
| EXPORT_SYMBOL(nvec_write_sync); |
| |
| /** |
| * nvec_toggle_global_events - enables or disables global event reporting |
| * @nvec: nvec handle |
| * @state: true for enable, false for disable |
| * |
| * This switches on/off global event reports by the embedded controller. |
| */ |
| static void nvec_toggle_global_events(struct nvec_chip *nvec, bool state) |
| { |
| unsigned char global_events[] = { NVEC_SLEEP, GLOBAL_EVENTS, state }; |
| |
| nvec_write_async(nvec, global_events, 3); |
| } |
| |
| /** |
| * nvec_event_mask - fill the command string with event bitfield |
| * ev: points to event command string |
| * mask: bit to insert into the event mask |
| * |
| * Configure event command expects a 32 bit bitfield which describes |
| * which events to enable. The bitfield has the following structure |
| * (from highest byte to lowest): |
| * system state bits 7-0 |
| * system state bits 15-8 |
| * oem system state bits 7-0 |
| * oem system state bits 15-8 |
| */ |
| static void nvec_event_mask(char *ev, u32 mask) |
| { |
| ev[3] = mask >> 16 & 0xff; |
| ev[4] = mask >> 24 & 0xff; |
| ev[5] = mask >> 0 & 0xff; |
| ev[6] = mask >> 8 & 0xff; |
| } |
| |
| /** |
| * nvec_request_master - Process outgoing messages |
| * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) |
| * |
| * Processes all outgoing requests by sending the request and awaiting the |
| * response, then continuing with the next request. Once a request has a |
| * matching response, it will be freed and removed from the list. |
| */ |
| static void nvec_request_master(struct work_struct *work) |
| { |
| struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); |
| unsigned long flags; |
| long err; |
| struct nvec_msg *msg; |
| |
| spin_lock_irqsave(&nvec->tx_lock, flags); |
| while (!list_empty(&nvec->tx_data)) { |
| msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); |
| spin_unlock_irqrestore(&nvec->tx_lock, flags); |
| nvec_gpio_set_value(nvec, 0); |
| err = wait_for_completion_interruptible_timeout( |
| &nvec->ec_transfer, msecs_to_jiffies(5000)); |
| |
| if (err == 0) { |
| dev_warn(nvec->dev, "timeout waiting for ec transfer\n"); |
| nvec_gpio_set_value(nvec, 1); |
| msg->pos = 0; |
| } |
| |
| spin_lock_irqsave(&nvec->tx_lock, flags); |
| |
| if (err > 0) { |
| list_del_init(&msg->node); |
| nvec_msg_free(nvec, msg); |
| } |
| } |
| spin_unlock_irqrestore(&nvec->tx_lock, flags); |
| } |
| |
| /** |
| * parse_msg - Print some information and call the notifiers on an RX message |
| * @nvec: A &struct nvec_chip |
| * @msg: A message received by @nvec |
| * |
| * Paarse some pieces of the message and then call the chain of notifiers |
| * registered via nvec_register_notifier. |
| */ |
| static int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) |
| { |
| if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { |
| dev_err(nvec->dev, "ec responded %*ph\n", 4, msg->data); |
| return -EINVAL; |
| } |
| |
| if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) |
| print_hex_dump(KERN_WARNING, "ec system event ", |
| DUMP_PREFIX_NONE, 16, 1, msg->data, |
| msg->data[1] + 2, true); |
| |
| atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, |
| msg->data); |
| |
| return 0; |
| } |
| |
| /** |
| * nvec_dispatch - Process messages received from the EC |
| * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) |
| * |
| * Process messages previously received from the EC and put into the RX |
| * queue of the &struct nvec_chip instance associated with @work. |
| */ |
| static void nvec_dispatch(struct work_struct *work) |
| { |
| struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); |
| unsigned long flags; |
| struct nvec_msg *msg; |
| |
| spin_lock_irqsave(&nvec->rx_lock, flags); |
| while (!list_empty(&nvec->rx_data)) { |
| msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); |
| list_del_init(&msg->node); |
| spin_unlock_irqrestore(&nvec->rx_lock, flags); |
| |
| if (nvec->sync_write_pending == |
| (msg->data[2] << 8) + msg->data[0]) { |
| dev_dbg(nvec->dev, "sync write completed!\n"); |
| nvec->sync_write_pending = 0; |
| nvec->last_sync_msg = msg; |
| complete(&nvec->sync_write); |
| } else { |
| parse_msg(nvec, msg); |
| nvec_msg_free(nvec, msg); |
| } |
| spin_lock_irqsave(&nvec->rx_lock, flags); |
| } |
| spin_unlock_irqrestore(&nvec->rx_lock, flags); |
| } |
| |
| /** |
| * nvec_tx_completed - Complete the current transfer |
| * @nvec: A &struct nvec_chip |
| * |
| * This is called when we have received an END_TRANS on a TX transfer. |
| */ |
| static void nvec_tx_completed(struct nvec_chip *nvec) |
| { |
| /* We got an END_TRANS, let's skip this, maybe there's an event */ |
| if (nvec->tx->pos != nvec->tx->size) { |
| dev_err(nvec->dev, "premature END_TRANS, resending\n"); |
| nvec->tx->pos = 0; |
| nvec_gpio_set_value(nvec, 0); |
| } else { |
| nvec->state = 0; |
| } |
| } |
| |
| /** |
| * nvec_rx_completed - Complete the current transfer |
| * @nvec: A &struct nvec_chip |
| * |
| * This is called when we have received an END_TRANS on a RX transfer. |
| */ |
| static void nvec_rx_completed(struct nvec_chip *nvec) |
| { |
| if (nvec->rx->pos != nvec_msg_size(nvec->rx)) { |
| dev_err(nvec->dev, "RX incomplete: Expected %u bytes, got %u\n", |
| (uint) nvec_msg_size(nvec->rx), |
| (uint) nvec->rx->pos); |
| |
| nvec_msg_free(nvec, nvec->rx); |
| nvec->state = 0; |
| |
| /* Battery quirk - Often incomplete, and likes to crash */ |
| if (nvec->rx->data[0] == NVEC_BAT) |
| complete(&nvec->ec_transfer); |
| |
| return; |
| } |
| |
| spin_lock(&nvec->rx_lock); |
| |
| /* add the received data to the work list |
| and move the ring buffer pointer to the next entry */ |
| list_add_tail(&nvec->rx->node, &nvec->rx_data); |
| |
| spin_unlock(&nvec->rx_lock); |
| |
| nvec->state = 0; |
| |
| if (!nvec_msg_is_event(nvec->rx)) |
| complete(&nvec->ec_transfer); |
| |
| schedule_work(&nvec->rx_work); |
| } |
| |
| /** |
| * nvec_invalid_flags - Send an error message about invalid flags and jump |
| * @nvec: The nvec device |
| * @status: The status flags |
| * @reset: Whether we shall jump to state 0. |
| */ |
| static void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status, |
| bool reset) |
| { |
| dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n", |
| status, nvec->state); |
| if (reset) |
| nvec->state = 0; |
| } |
| |
| /** |
| * nvec_tx_set - Set the message to transfer (nvec->tx) |
| * @nvec: A &struct nvec_chip |
| * |
| * Gets the first entry from the tx_data list of @nvec and sets the |
| * tx member to it. If the tx_data list is empty, this uses the |
| * tx_scratch message to send a no operation message. |
| */ |
| static void nvec_tx_set(struct nvec_chip *nvec) |
| { |
| spin_lock(&nvec->tx_lock); |
| if (list_empty(&nvec->tx_data)) { |
| dev_err(nvec->dev, "empty tx - sending no-op\n"); |
| memcpy(nvec->tx_scratch.data, "\x02\x07\x02", 3); |
| nvec->tx_scratch.size = 3; |
| nvec->tx_scratch.pos = 0; |
| nvec->tx = &nvec->tx_scratch; |
| list_add_tail(&nvec->tx->node, &nvec->tx_data); |
| } else { |
| nvec->tx = list_first_entry(&nvec->tx_data, struct nvec_msg, |
| node); |
| nvec->tx->pos = 0; |
| } |
| spin_unlock(&nvec->tx_lock); |
| |
| dev_dbg(nvec->dev, "Sending message of length %u, command 0x%x\n", |
| (uint)nvec->tx->size, nvec->tx->data[1]); |
| } |
| |
| /** |
| * nvec_interrupt - Interrupt handler |
| * @irq: The IRQ |
| * @dev: The nvec device |
| * |
| * Interrupt handler that fills our RX buffers and empties our TX |
| * buffers. This uses a finite state machine with ridiculous amounts |
| * of error checking, in order to be fairly reliable. |
| */ |
| static irqreturn_t nvec_interrupt(int irq, void *dev) |
| { |
| unsigned long status; |
| unsigned int received = 0; |
| unsigned char to_send = 0xff; |
| const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW; |
| struct nvec_chip *nvec = dev; |
| unsigned int state = nvec->state; |
| |
| status = readl(nvec->base + I2C_SL_STATUS); |
| |
| /* Filter out some errors */ |
| if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) { |
| dev_err(nvec->dev, "unexpected irq mask %lx\n", status); |
| return IRQ_HANDLED; |
| } |
| if ((status & I2C_SL_IRQ) == 0) { |
| dev_err(nvec->dev, "Spurious IRQ\n"); |
| return IRQ_HANDLED; |
| } |
| |
| /* The EC did not request a read, so it send us something, read it */ |
| if ((status & RNW) == 0) { |
| received = readl(nvec->base + I2C_SL_RCVD); |
| if (status & RCVD) |
| writel(0, nvec->base + I2C_SL_RCVD); |
| } |
| |
| if (status == (I2C_SL_IRQ | RCVD)) |
| nvec->state = 0; |
| |
| switch (nvec->state) { |
| case 0: /* Verify that its a transfer start, the rest later */ |
| if (status != (I2C_SL_IRQ | RCVD)) |
| nvec_invalid_flags(nvec, status, false); |
| break; |
| case 1: /* command byte */ |
| if (status != I2C_SL_IRQ) { |
| nvec_invalid_flags(nvec, status, true); |
| } else { |
| nvec->rx = nvec_msg_alloc(nvec, NVEC_MSG_RX); |
| /* Should not happen in a normal world */ |
| if (unlikely(nvec->rx == NULL)) { |
| nvec->state = 0; |
| break; |
| } |
| nvec->rx->data[0] = received; |
| nvec->rx->pos = 1; |
| nvec->state = 2; |
| } |
| break; |
| case 2: /* first byte after command */ |
| if (status == (I2C_SL_IRQ | RNW | RCVD)) { |
| udelay(33); |
| if (nvec->rx->data[0] != 0x01) { |
| dev_err(nvec->dev, |
| "Read without prior read command\n"); |
| nvec->state = 0; |
| break; |
| } |
| nvec_msg_free(nvec, nvec->rx); |
| nvec->state = 3; |
| nvec_tx_set(nvec); |
| BUG_ON(nvec->tx->size < 1); |
| to_send = nvec->tx->data[0]; |
| nvec->tx->pos = 1; |
| } else if (status == (I2C_SL_IRQ)) { |
| BUG_ON(nvec->rx == NULL); |
| nvec->rx->data[1] = received; |
| nvec->rx->pos = 2; |
| nvec->state = 4; |
| } else { |
| nvec_invalid_flags(nvec, status, true); |
| } |
| break; |
| case 3: /* EC does a block read, we transmit data */ |
| if (status & END_TRANS) { |
| nvec_tx_completed(nvec); |
| } else if ((status & RNW) == 0 || (status & RCVD)) { |
| nvec_invalid_flags(nvec, status, true); |
| } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) { |
| to_send = nvec->tx->data[nvec->tx->pos++]; |
| } else { |
| dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n", |
| nvec->tx, |
| (uint) (nvec->tx ? nvec->tx->pos : 0), |
| (uint) (nvec->tx ? nvec->tx->size : 0)); |
| nvec->state = 0; |
| } |
| break; |
| case 4: /* EC does some write, we read the data */ |
| if ((status & (END_TRANS | RNW)) == END_TRANS) |
| nvec_rx_completed(nvec); |
| else if (status & (RNW | RCVD)) |
| nvec_invalid_flags(nvec, status, true); |
| else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE) |
| nvec->rx->data[nvec->rx->pos++] = received; |
| else |
| dev_err(nvec->dev, |
| "RX buffer overflow on %p: " |
| "Trying to write byte %u of %u\n", |
| nvec->rx, nvec->rx ? nvec->rx->pos : 0, |
| NVEC_MSG_SIZE); |
| break; |
| default: |
| nvec->state = 0; |
| } |
| |
| /* If we are told that a new transfer starts, verify it */ |
| if ((status & (RCVD | RNW)) == RCVD) { |
| if (received != nvec->i2c_addr) |
| dev_err(nvec->dev, |
| "received address 0x%02x, expected 0x%02x\n", |
| received, nvec->i2c_addr); |
| nvec->state = 1; |
| } |
| |
| /* Send data if requested, but not on end of transmission */ |
| if ((status & (RNW | END_TRANS)) == RNW) |
| writel(to_send, nvec->base + I2C_SL_RCVD); |
| |
| /* If we have send the first byte */ |
| if (status == (I2C_SL_IRQ | RNW | RCVD)) |
| nvec_gpio_set_value(nvec, 1); |
| |
| dev_dbg(nvec->dev, |
| "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n", |
| (status & RNW) == 0 ? "received" : "R=", |
| received, |
| (status & (RNW | END_TRANS)) ? "sent" : "S=", |
| to_send, |
| state, |
| status & END_TRANS ? " END_TRANS" : "", |
| status & RCVD ? " RCVD" : "", |
| status & RNW ? " RNW" : ""); |
| |
| |
| /* |
| * TODO: A correct fix needs to be found for this. |
| * |
| * We experience less incomplete messages with this delay than without |
| * it, but we don't know why. Help is appreciated. |
| */ |
| udelay(100); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static void tegra_init_i2c_slave(struct nvec_chip *nvec) |
| { |
| u32 val; |
| |
| clk_prepare_enable(nvec->i2c_clk); |
| |
| tegra_periph_reset_assert(nvec->i2c_clk); |
| udelay(2); |
| tegra_periph_reset_deassert(nvec->i2c_clk); |
| |
| val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | |
| (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); |
| writel(val, nvec->base + I2C_CNFG); |
| |
| clk_set_rate(nvec->i2c_clk, 8 * 80000); |
| |
| writel(I2C_SL_NEWSL, nvec->base + I2C_SL_CNFG); |
| writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); |
| |
| writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); |
| writel(0, nvec->base + I2C_SL_ADDR2); |
| |
| enable_irq(nvec->irq); |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static void nvec_disable_i2c_slave(struct nvec_chip *nvec) |
| { |
| disable_irq(nvec->irq); |
| writel(I2C_SL_NEWSL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); |
| clk_disable_unprepare(nvec->i2c_clk); |
| } |
| #endif |
| |
| static void nvec_power_off(void) |
| { |
| char ap_pwr_down[] = { NVEC_SLEEP, AP_PWR_DOWN }; |
| |
| nvec_toggle_global_events(nvec_power_handle, false); |
| nvec_write_async(nvec_power_handle, ap_pwr_down, 2); |
| } |
| |
| /* |
| * Parse common device tree data |
| */ |
| static int nvec_i2c_parse_dt_pdata(struct nvec_chip *nvec) |
| { |
| nvec->gpio = of_get_named_gpio(nvec->dev->of_node, "request-gpios", 0); |
| |
| if (nvec->gpio < 0) { |
| dev_err(nvec->dev, "no gpio specified"); |
| return -ENODEV; |
| } |
| |
| if (of_property_read_u32(nvec->dev->of_node, "slave-addr", |
| &nvec->i2c_addr)) { |
| dev_err(nvec->dev, "no i2c address specified"); |
| return -ENODEV; |
| } |
| |
| return 0; |
| } |
| |
| static int tegra_nvec_probe(struct platform_device *pdev) |
| { |
| int err, ret; |
| struct clk *i2c_clk; |
| struct nvec_chip *nvec; |
| struct nvec_msg *msg; |
| struct resource *res; |
| void __iomem *base; |
| char get_firmware_version[] = { NVEC_CNTL, GET_FIRMWARE_VERSION }, |
| unmute_speakers[] = { NVEC_OEM0, 0x10, 0x59, 0x95 }, |
| enable_event[7] = { NVEC_SYS, CNF_EVENT_REPORTING, true }; |
| |
| if (!pdev->dev.of_node) { |
| dev_err(&pdev->dev, "must be instantiated using device tree\n"); |
| return -ENODEV; |
| } |
| |
| nvec = devm_kzalloc(&pdev->dev, sizeof(struct nvec_chip), GFP_KERNEL); |
| if (nvec == NULL) { |
| dev_err(&pdev->dev, "failed to reserve memory\n"); |
| return -ENOMEM; |
| } |
| platform_set_drvdata(pdev, nvec); |
| nvec->dev = &pdev->dev; |
| |
| err = nvec_i2c_parse_dt_pdata(nvec); |
| if (err < 0) |
| return err; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| base = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(base)) |
| return PTR_ERR(base); |
| |
| res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| if (!res) { |
| dev_err(&pdev->dev, "no irq resource?\n"); |
| return -ENODEV; |
| } |
| |
| i2c_clk = devm_clk_get(&pdev->dev, "div-clk"); |
| if (IS_ERR(i2c_clk)) { |
| dev_err(nvec->dev, "failed to get controller clock\n"); |
| return -ENODEV; |
| } |
| |
| nvec->base = base; |
| nvec->irq = res->start; |
| nvec->i2c_clk = i2c_clk; |
| nvec->rx = &nvec->msg_pool[0]; |
| |
| ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); |
| |
| init_completion(&nvec->sync_write); |
| init_completion(&nvec->ec_transfer); |
| mutex_init(&nvec->sync_write_mutex); |
| spin_lock_init(&nvec->tx_lock); |
| spin_lock_init(&nvec->rx_lock); |
| INIT_LIST_HEAD(&nvec->rx_data); |
| INIT_LIST_HEAD(&nvec->tx_data); |
| INIT_WORK(&nvec->rx_work, nvec_dispatch); |
| INIT_WORK(&nvec->tx_work, nvec_request_master); |
| |
| err = devm_gpio_request_one(&pdev->dev, nvec->gpio, GPIOF_OUT_INIT_HIGH, |
| "nvec gpio"); |
| if (err < 0) { |
| dev_err(nvec->dev, "couldn't request gpio\n"); |
| return -ENODEV; |
| } |
| |
| err = devm_request_irq(&pdev->dev, nvec->irq, nvec_interrupt, 0, |
| "nvec", nvec); |
| if (err) { |
| dev_err(nvec->dev, "couldn't request irq\n"); |
| return -ENODEV; |
| } |
| disable_irq(nvec->irq); |
| |
| tegra_init_i2c_slave(nvec); |
| |
| /* enable event reporting */ |
| nvec_toggle_global_events(nvec, true); |
| |
| nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; |
| nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); |
| |
| nvec_power_handle = nvec; |
| pm_power_off = nvec_power_off; |
| |
| /* Get Firmware Version */ |
| msg = nvec_write_sync(nvec, get_firmware_version, 2); |
| |
| if (msg) { |
| dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", |
| msg->data[4], msg->data[5], msg->data[6], msg->data[7]); |
| |
| nvec_msg_free(nvec, msg); |
| } |
| |
| ret = mfd_add_devices(nvec->dev, -1, nvec_devices, |
| ARRAY_SIZE(nvec_devices), base, 0, NULL); |
| if (ret) |
| dev_err(nvec->dev, "error adding subdevices\n"); |
| |
| /* unmute speakers? */ |
| nvec_write_async(nvec, unmute_speakers, 4); |
| |
| /* enable lid switch event */ |
| nvec_event_mask(enable_event, LID_SWITCH); |
| nvec_write_async(nvec, enable_event, 7); |
| |
| /* enable power button event */ |
| nvec_event_mask(enable_event, PWR_BUTTON); |
| nvec_write_async(nvec, enable_event, 7); |
| |
| return 0; |
| } |
| |
| static int tegra_nvec_remove(struct platform_device *pdev) |
| { |
| struct nvec_chip *nvec = platform_get_drvdata(pdev); |
| |
| nvec_toggle_global_events(nvec, false); |
| mfd_remove_devices(nvec->dev); |
| nvec_unregister_notifier(nvec, &nvec->nvec_status_notifier); |
| cancel_work_sync(&nvec->rx_work); |
| cancel_work_sync(&nvec->tx_work); |
| /* FIXME: needs check wether nvec is responsible for power off */ |
| pm_power_off = NULL; |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int nvec_suspend(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct nvec_chip *nvec = platform_get_drvdata(pdev); |
| struct nvec_msg *msg; |
| char ap_suspend[] = { NVEC_SLEEP, AP_SUSPEND }; |
| |
| dev_dbg(nvec->dev, "suspending\n"); |
| |
| /* keep these sync or you'll break suspend */ |
| nvec_toggle_global_events(nvec, false); |
| |
| msg = nvec_write_sync(nvec, ap_suspend, sizeof(ap_suspend)); |
| nvec_msg_free(nvec, msg); |
| |
| nvec_disable_i2c_slave(nvec); |
| |
| return 0; |
| } |
| |
| static int nvec_resume(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct nvec_chip *nvec = platform_get_drvdata(pdev); |
| |
| dev_dbg(nvec->dev, "resuming\n"); |
| tegra_init_i2c_slave(nvec); |
| nvec_toggle_global_events(nvec, true); |
| |
| return 0; |
| } |
| #endif |
| |
| static const SIMPLE_DEV_PM_OPS(nvec_pm_ops, nvec_suspend, nvec_resume); |
| |
| /* Match table for of_platform binding */ |
| static const struct of_device_id nvidia_nvec_of_match[] = { |
| { .compatible = "nvidia,nvec", }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, nvidia_nvec_of_match); |
| |
| static struct platform_driver nvec_device_driver = { |
| .probe = tegra_nvec_probe, |
| .remove = tegra_nvec_remove, |
| .driver = { |
| .name = "nvec", |
| .owner = THIS_MODULE, |
| .pm = &nvec_pm_ops, |
| .of_match_table = nvidia_nvec_of_match, |
| } |
| }; |
| |
| module_platform_driver(nvec_device_driver); |
| |
| MODULE_ALIAS("platform:nvec"); |
| MODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); |
| MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); |
| MODULE_LICENSE("GPL"); |