1162c7d8cSMarc Dietrich /* 2162c7d8cSMarc Dietrich * NVEC: NVIDIA compliant embedded controller interface 3162c7d8cSMarc Dietrich * 4162c7d8cSMarc Dietrich * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.lauchpad.net> 5162c7d8cSMarc Dietrich * 6162c7d8cSMarc Dietrich * Authors: Pierre-Hugues Husson <phhusson@free.fr> 7162c7d8cSMarc Dietrich * Ilya Petrov <ilya.muromec@gmail.com> 8162c7d8cSMarc Dietrich * Marc Dietrich <marvin24@gmx.de> 9791c4a64SJulian Andres Klode * Julian Andres Klode <jak@jak-linux.org> 10162c7d8cSMarc Dietrich * 11162c7d8cSMarc Dietrich * This file is subject to the terms and conditions of the GNU General Public 12162c7d8cSMarc Dietrich * License. See the file "COPYING" in the main directory of this archive 13162c7d8cSMarc Dietrich * for more details. 14162c7d8cSMarc Dietrich * 1532890b98SMarc Dietrich */ 1632890b98SMarc Dietrich 17162c7d8cSMarc Dietrich /* #define DEBUG */ 18162c7d8cSMarc Dietrich 1932890b98SMarc Dietrich #include <asm/irq.h> 20162c7d8cSMarc Dietrich 210b1076c4SJulian Andres Klode #include <linux/atomic.h> 2232890b98SMarc Dietrich #include <linux/completion.h> 2332890b98SMarc Dietrich #include <linux/interrupt.h> 24162c7d8cSMarc Dietrich #include <linux/io.h> 2532890b98SMarc Dietrich #include <linux/irq.h> 2632890b98SMarc Dietrich #include <linux/slab.h> 2732890b98SMarc Dietrich #include <linux/gpio.h> 2832890b98SMarc Dietrich #include <linux/serio.h> 2932890b98SMarc Dietrich #include <linux/delay.h> 3032890b98SMarc Dietrich #include <linux/input.h> 3132890b98SMarc Dietrich #include <linux/workqueue.h> 3232890b98SMarc Dietrich #include <linux/clk.h> 33162c7d8cSMarc Dietrich 3432890b98SMarc Dietrich #include <linux/semaphore.h> 3532890b98SMarc Dietrich #include <linux/list.h> 3632890b98SMarc Dietrich #include <linux/notifier.h> 3732890b98SMarc Dietrich #include <linux/platform_device.h> 38f686e9afSMarc Dietrich #include <linux/mfd/core.h> 39162c7d8cSMarc Dietrich 40162c7d8cSMarc Dietrich #include <mach/iomap.h> 41162c7d8cSMarc Dietrich #include <mach/clk.h> 42162c7d8cSMarc Dietrich 4332890b98SMarc Dietrich #include "nvec.h" 4432890b98SMarc Dietrich 45391d2fa9SJulian Andres Klode #define I2C_CNFG 0x00 46391d2fa9SJulian Andres Klode #define I2C_CNFG_PACKET_MODE_EN (1<<10) 47391d2fa9SJulian Andres Klode #define I2C_CNFG_NEW_MASTER_SFM (1<<11) 48391d2fa9SJulian Andres Klode #define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12 49391d2fa9SJulian Andres Klode 50391d2fa9SJulian Andres Klode #define I2C_SL_CNFG 0x20 51391d2fa9SJulian Andres Klode #define I2C_SL_NEWL (1<<2) 52391d2fa9SJulian Andres Klode #define I2C_SL_NACK (1<<1) 53391d2fa9SJulian Andres Klode #define I2C_SL_RESP (1<<0) 54391d2fa9SJulian Andres Klode #define I2C_SL_IRQ (1<<3) 55391d2fa9SJulian Andres Klode #define END_TRANS (1<<4) 56391d2fa9SJulian Andres Klode #define RCVD (1<<2) 57391d2fa9SJulian Andres Klode #define RNW (1<<1) 58391d2fa9SJulian Andres Klode 59391d2fa9SJulian Andres Klode #define I2C_SL_RCVD 0x24 60391d2fa9SJulian Andres Klode #define I2C_SL_STATUS 0x28 61391d2fa9SJulian Andres Klode #define I2C_SL_ADDR1 0x2c 62391d2fa9SJulian Andres Klode #define I2C_SL_ADDR2 0x30 63391d2fa9SJulian Andres Klode #define I2C_SL_DELAY_COUNT 0x3c 64391d2fa9SJulian Andres Klode 65bb0590e2SJulian Andres Klode /** 66bb0590e2SJulian Andres Klode * enum nvec_msg_category - Message categories for nvec_msg_alloc() 67bb0590e2SJulian Andres Klode * @NVEC_MSG_RX: The message is an incoming message (from EC) 68bb0590e2SJulian Andres Klode * @NVEC_MSG_TX: The message is an outgoing message (to EC) 69bb0590e2SJulian Andres Klode */ 70bb0590e2SJulian Andres Klode enum nvec_msg_category { 71bb0590e2SJulian Andres Klode NVEC_MSG_RX, 72bb0590e2SJulian Andres Klode NVEC_MSG_TX, 73bb0590e2SJulian Andres Klode }; 74bb0590e2SJulian Andres Klode 75162c7d8cSMarc Dietrich static const unsigned char EC_DISABLE_EVENT_REPORTING[3] = "\x04\x00\x00"; 76162c7d8cSMarc Dietrich static const unsigned char EC_ENABLE_EVENT_REPORTING[3] = "\x04\x00\x01"; 77162c7d8cSMarc Dietrich static const unsigned char EC_GET_FIRMWARE_VERSION[2] = "\x07\x15"; 7832890b98SMarc Dietrich 7932890b98SMarc Dietrich static struct nvec_chip *nvec_power_handle; 8032890b98SMarc Dietrich 81f686e9afSMarc Dietrich static struct mfd_cell nvec_devices[] = { 82f686e9afSMarc Dietrich { 83f686e9afSMarc Dietrich .name = "nvec-kbd", 84f686e9afSMarc Dietrich .id = 1, 85f686e9afSMarc Dietrich }, 86f686e9afSMarc Dietrich { 87f686e9afSMarc Dietrich .name = "nvec-mouse", 88f686e9afSMarc Dietrich .id = 1, 89f686e9afSMarc Dietrich }, 90f686e9afSMarc Dietrich { 91f686e9afSMarc Dietrich .name = "nvec-power", 92f686e9afSMarc Dietrich .id = 1, 93f686e9afSMarc Dietrich }, 94f686e9afSMarc Dietrich { 95f686e9afSMarc Dietrich .name = "nvec-power", 96f686e9afSMarc Dietrich .id = 2, 97f686e9afSMarc Dietrich }, 9897cc2657SIlya Petrov { 9997cc2657SIlya Petrov .name = "nvec-leds", 10097cc2657SIlya Petrov .id = 1, 10197cc2657SIlya Petrov }, 102f686e9afSMarc Dietrich }; 103f686e9afSMarc Dietrich 104bdf034d9SJulian Andres Klode /** 105bdf034d9SJulian Andres Klode * nvec_register_notifier - Register a notifier with nvec 106bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 107bdf034d9SJulian Andres Klode * @nb: The notifier block to register 108bdf034d9SJulian Andres Klode * 109bdf034d9SJulian Andres Klode * Registers a notifier with @nvec. The notifier will be added to an atomic 110bdf034d9SJulian Andres Klode * notifier chain that is called for all received messages except those that 111bdf034d9SJulian Andres Klode * correspond to a request initiated by nvec_write_sync(). 112bdf034d9SJulian Andres Klode */ 11332890b98SMarc Dietrich int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, 11432890b98SMarc Dietrich unsigned int events) 11532890b98SMarc Dietrich { 11632890b98SMarc Dietrich return atomic_notifier_chain_register(&nvec->notifier_list, nb); 11732890b98SMarc Dietrich } 11832890b98SMarc Dietrich EXPORT_SYMBOL_GPL(nvec_register_notifier); 11932890b98SMarc Dietrich 120bdf034d9SJulian Andres Klode /** 121bdf034d9SJulian Andres Klode * nvec_status_notifier - The final notifier 122bdf034d9SJulian Andres Klode * 123bdf034d9SJulian Andres Klode * Prints a message about control events not handled in the notifier 124bdf034d9SJulian Andres Klode * chain. 125bdf034d9SJulian Andres Klode */ 126162c7d8cSMarc Dietrich static int nvec_status_notifier(struct notifier_block *nb, 127162c7d8cSMarc Dietrich unsigned long event_type, void *data) 12832890b98SMarc Dietrich { 12932890b98SMarc Dietrich unsigned char *msg = (unsigned char *)data; 13032890b98SMarc Dietrich 13132890b98SMarc Dietrich if (event_type != NVEC_CNTL) 13232890b98SMarc Dietrich return NOTIFY_DONE; 13332890b98SMarc Dietrich 134a3a9aa1aSMarc Dietrich printk(KERN_WARNING "unhandled msg type %ld\n", event_type); 135a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "payload: ", DUMP_PREFIX_NONE, 16, 1, 136a3a9aa1aSMarc Dietrich msg, msg[1] + 2, true); 13732890b98SMarc Dietrich 13832890b98SMarc Dietrich return NOTIFY_OK; 13932890b98SMarc Dietrich } 14032890b98SMarc Dietrich 141bdf034d9SJulian Andres Klode /** 142bdf034d9SJulian Andres Klode * nvec_msg_alloc: 143bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 144bb0590e2SJulian Andres Klode * @category: Pool category, see &enum nvec_msg_category 145bdf034d9SJulian Andres Klode * 146bdf034d9SJulian Andres Klode * Allocate a single &struct nvec_msg object from the message pool of 147bdf034d9SJulian Andres Klode * @nvec. The result shall be passed to nvec_msg_free() if no longer 148bdf034d9SJulian Andres Klode * used. 149bb0590e2SJulian Andres Klode * 150bb0590e2SJulian Andres Klode * Outgoing messages are placed in the upper 75% of the pool, keeping the 151bb0590e2SJulian Andres Klode * lower 25% available for RX buffers only. The reason is to prevent a 152bb0590e2SJulian Andres Klode * situation where all buffers are full and a message is thus endlessly 153bb0590e2SJulian Andres Klode * retried because the response could never be processed. 154bdf034d9SJulian Andres Klode */ 155bb0590e2SJulian Andres Klode static struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec, 156bb0590e2SJulian Andres Klode enum nvec_msg_category category) 1570b1076c4SJulian Andres Klode { 158bb0590e2SJulian Andres Klode int i = (category == NVEC_MSG_TX) ? (NVEC_POOL_SIZE / 4) : 0; 1590b1076c4SJulian Andres Klode 160bb0590e2SJulian Andres Klode for (; i < NVEC_POOL_SIZE; i++) { 1610b1076c4SJulian Andres Klode if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { 1620b1076c4SJulian Andres Klode dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); 1630b1076c4SJulian Andres Klode return &nvec->msg_pool[i]; 1640b1076c4SJulian Andres Klode } 1650b1076c4SJulian Andres Klode } 1660b1076c4SJulian Andres Klode 167bb0590e2SJulian Andres Klode dev_err(nvec->dev, "could not allocate %s buffer\n", 168bb0590e2SJulian Andres Klode (category == NVEC_MSG_TX) ? "TX" : "RX"); 1690b1076c4SJulian Andres Klode 1700b1076c4SJulian Andres Klode return NULL; 1710b1076c4SJulian Andres Klode } 1720b1076c4SJulian Andres Klode 173bdf034d9SJulian Andres Klode /** 174bdf034d9SJulian Andres Klode * nvec_msg_free: 175bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 176bdf034d9SJulian Andres Klode * @msg: A message (must be allocated by nvec_msg_alloc() and belong to @nvec) 177bdf034d9SJulian Andres Klode * 178bdf034d9SJulian Andres Klode * Free the given message 179bdf034d9SJulian Andres Klode */ 180198dd267SJulian Andres Klode inline void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) 1810b1076c4SJulian Andres Klode { 1827b770657SJulian Andres Klode if (msg != &nvec->tx_scratch) 1830b1076c4SJulian Andres Klode dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); 1840b1076c4SJulian Andres Klode atomic_set(&msg->used, 0); 1850b1076c4SJulian Andres Klode } 186198dd267SJulian Andres Klode EXPORT_SYMBOL_GPL(nvec_msg_free); 1870b1076c4SJulian Andres Klode 1888517e879SJulian Andres Klode /** 1898517e879SJulian Andres Klode * nvec_msg_is_event - Return %true if @msg is an event 1908517e879SJulian Andres Klode * @msg: A message 1918517e879SJulian Andres Klode */ 1928517e879SJulian Andres Klode static bool nvec_msg_is_event(struct nvec_msg *msg) 1938517e879SJulian Andres Klode { 1948517e879SJulian Andres Klode return msg->data[0] >> 7; 1958517e879SJulian Andres Klode } 1968517e879SJulian Andres Klode 1978517e879SJulian Andres Klode /** 1988517e879SJulian Andres Klode * nvec_msg_size - Get the size of a message 1998517e879SJulian Andres Klode * @msg: The message to get the size for 2008517e879SJulian Andres Klode * 2018517e879SJulian Andres Klode * This only works for received messages, not for outgoing messages. 2028517e879SJulian Andres Klode */ 2038517e879SJulian Andres Klode static size_t nvec_msg_size(struct nvec_msg *msg) 2048517e879SJulian Andres Klode { 2058517e879SJulian Andres Klode bool is_event = nvec_msg_is_event(msg); 2068517e879SJulian Andres Klode int event_length = (msg->data[0] & 0x60) >> 5; 2078517e879SJulian Andres Klode 2088517e879SJulian Andres Klode /* for variable size, payload size in byte 1 + count (1) + cmd (1) */ 2098517e879SJulian Andres Klode if (!is_event || event_length == NVEC_VAR_SIZE) 2108517e879SJulian Andres Klode return (msg->pos || msg->size) ? (msg->data[1] + 2) : 0; 2118517e879SJulian Andres Klode else if (event_length == NVEC_2BYTES) 2128517e879SJulian Andres Klode return 2; 2138517e879SJulian Andres Klode else if (event_length == NVEC_3BYTES) 2148517e879SJulian Andres Klode return 3; 2158517e879SJulian Andres Klode else 2168517e879SJulian Andres Klode return 0; 2178517e879SJulian Andres Klode } 2188517e879SJulian Andres Klode 219bdf034d9SJulian Andres Klode /** 220bdf034d9SJulian Andres Klode * nvec_gpio_set_value - Set the GPIO value 221bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 222bdf034d9SJulian Andres Klode * @value: The value to write (0 or 1) 223bdf034d9SJulian Andres Klode * 224bdf034d9SJulian Andres Klode * Like gpio_set_value(), but generating debugging information 225bdf034d9SJulian Andres Klode */ 226e7c40851SJulian Andres Klode static void nvec_gpio_set_value(struct nvec_chip *nvec, int value) 227e7c40851SJulian Andres Klode { 228e7c40851SJulian Andres Klode dev_dbg(nvec->dev, "GPIO changed from %u to %u\n", 229e7c40851SJulian Andres Klode gpio_get_value(nvec->gpio), value); 230e7c40851SJulian Andres Klode gpio_set_value(nvec->gpio, value); 231e7c40851SJulian Andres Klode } 232e7c40851SJulian Andres Klode 233bdf034d9SJulian Andres Klode /** 234bdf034d9SJulian Andres Klode * nvec_write_async - Asynchronously write a message to NVEC 235bdf034d9SJulian Andres Klode * @nvec: An nvec_chip instance 236bdf034d9SJulian Andres Klode * @data: The message data, starting with the request type 237bdf034d9SJulian Andres Klode * @size: The size of @data 238bdf034d9SJulian Andres Klode * 239bdf034d9SJulian Andres Klode * Queue a single message to be transferred to the embedded controller 240bdf034d9SJulian Andres Klode * and return immediately. 241bdf034d9SJulian Andres Klode * 242bdf034d9SJulian Andres Klode * Returns: 0 on success, a negative error code on failure. If a failure 243bdf034d9SJulian Andres Klode * occured, the nvec driver may print an error. 244bdf034d9SJulian Andres Klode */ 2451b9bf629SJulian Andres Klode int nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, 246162c7d8cSMarc Dietrich short size) 24732890b98SMarc Dietrich { 2480cab4cb8SJulian Andres Klode struct nvec_msg *msg; 2490cab4cb8SJulian Andres Klode unsigned long flags; 25032890b98SMarc Dietrich 251bb0590e2SJulian Andres Klode msg = nvec_msg_alloc(nvec, NVEC_MSG_TX); 252bb0590e2SJulian Andres Klode 2531b9bf629SJulian Andres Klode if (msg == NULL) 2541b9bf629SJulian Andres Klode return -ENOMEM; 2551b9bf629SJulian Andres Klode 25632890b98SMarc Dietrich msg->data[0] = size; 25732890b98SMarc Dietrich memcpy(msg->data + 1, data, size); 25832890b98SMarc Dietrich msg->size = size + 1; 25932890b98SMarc Dietrich 2600cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 26132890b98SMarc Dietrich list_add_tail(&msg->node, &nvec->tx_data); 2620cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 26332890b98SMarc Dietrich 2640cab4cb8SJulian Andres Klode queue_work(nvec->wq, &nvec->tx_work); 2651b9bf629SJulian Andres Klode 2661b9bf629SJulian Andres Klode return 0; 26732890b98SMarc Dietrich } 26832890b98SMarc Dietrich EXPORT_SYMBOL(nvec_write_async); 26932890b98SMarc Dietrich 270bdf034d9SJulian Andres Klode /** 271bdf034d9SJulian Andres Klode * nvec_write_sync - Write a message to nvec and read the response 272bdf034d9SJulian Andres Klode * @nvec: An &struct nvec_chip 273bdf034d9SJulian Andres Klode * @data: The data to write 274bdf034d9SJulian Andres Klode * @size: The size of @data 275bdf034d9SJulian Andres Klode * 276bdf034d9SJulian Andres Klode * This is similar to nvec_write_async(), but waits for the 277bdf034d9SJulian Andres Klode * request to be answered before returning. This function 278bdf034d9SJulian Andres Klode * uses a mutex and can thus not be called from e.g. 279bdf034d9SJulian Andres Klode * interrupt handlers. 280bdf034d9SJulian Andres Klode * 281bdf034d9SJulian Andres Klode * Returns: A pointer to the response message on success, 282198dd267SJulian Andres Klode * %NULL on failure. Free with nvec_msg_free() once no longer 283198dd267SJulian Andres Klode * used. 284bdf034d9SJulian Andres Klode */ 2850cab4cb8SJulian Andres Klode struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, 2860cab4cb8SJulian Andres Klode const unsigned char *data, short size) 2870cab4cb8SJulian Andres Klode { 2880cab4cb8SJulian Andres Klode struct nvec_msg *msg; 2890cab4cb8SJulian Andres Klode 2900cab4cb8SJulian Andres Klode mutex_lock(&nvec->sync_write_mutex); 2910cab4cb8SJulian Andres Klode 2920cab4cb8SJulian Andres Klode nvec->sync_write_pending = (data[1] << 8) + data[0]; 2931b9bf629SJulian Andres Klode 2941b9bf629SJulian Andres Klode if (nvec_write_async(nvec, data, size) < 0) 2951b9bf629SJulian Andres Klode return NULL; 2960cab4cb8SJulian Andres Klode 2970cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", 2980cab4cb8SJulian Andres Klode nvec->sync_write_pending); 2990cab4cb8SJulian Andres Klode if (!(wait_for_completion_timeout(&nvec->sync_write, 3000cab4cb8SJulian Andres Klode msecs_to_jiffies(2000)))) { 3010cab4cb8SJulian Andres Klode dev_warn(nvec->dev, "timeout waiting for sync write to complete\n"); 3020cab4cb8SJulian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3030cab4cb8SJulian Andres Klode return NULL; 3040cab4cb8SJulian Andres Klode } 3050cab4cb8SJulian Andres Klode 3060cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); 3070cab4cb8SJulian Andres Klode 3080cab4cb8SJulian Andres Klode msg = nvec->last_sync_msg; 3090cab4cb8SJulian Andres Klode 3100cab4cb8SJulian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3110cab4cb8SJulian Andres Klode 3120cab4cb8SJulian Andres Klode return msg; 3130cab4cb8SJulian Andres Klode } 3140cab4cb8SJulian Andres Klode EXPORT_SYMBOL(nvec_write_sync); 3150cab4cb8SJulian Andres Klode 316bdf034d9SJulian Andres Klode /** 317bdf034d9SJulian Andres Klode * nvec_request_master - Process outgoing messages 318bdf034d9SJulian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 319bdf034d9SJulian Andres Klode * 320bdf034d9SJulian Andres Klode * Processes all outgoing requests by sending the request and awaiting the 321bdf034d9SJulian Andres Klode * response, then continuing with the next request. Once a request has a 322bdf034d9SJulian Andres Klode * matching response, it will be freed and removed from the list. 323bdf034d9SJulian Andres Klode */ 32432890b98SMarc Dietrich static void nvec_request_master(struct work_struct *work) 32532890b98SMarc Dietrich { 32632890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); 3270cab4cb8SJulian Andres Klode unsigned long flags; 3280cab4cb8SJulian Andres Klode long err; 3290cab4cb8SJulian Andres Klode struct nvec_msg *msg; 33032890b98SMarc Dietrich 3310cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3320cab4cb8SJulian Andres Klode while (!list_empty(&nvec->tx_data)) { 3330cab4cb8SJulian Andres Klode msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); 3340cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 3350cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 0); 3360cab4cb8SJulian Andres Klode err = wait_for_completion_interruptible_timeout( 3370cab4cb8SJulian Andres Klode &nvec->ec_transfer, msecs_to_jiffies(5000)); 3380cab4cb8SJulian Andres Klode 3390cab4cb8SJulian Andres Klode if (err == 0) { 3400cab4cb8SJulian Andres Klode dev_warn(nvec->dev, "timeout waiting for ec transfer\n"); 3410cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 1); 3420cab4cb8SJulian Andres Klode msg->pos = 0; 3430cab4cb8SJulian Andres Klode } 3440cab4cb8SJulian Andres Klode 3450cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3460cab4cb8SJulian Andres Klode 3470cab4cb8SJulian Andres Klode if (err > 0) { 3480cab4cb8SJulian Andres Klode list_del_init(&msg->node); 3490cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 3500cab4cb8SJulian Andres Klode } 3510cab4cb8SJulian Andres Klode } 3520cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 35332890b98SMarc Dietrich } 35432890b98SMarc Dietrich 355bdf034d9SJulian Andres Klode /** 356bdf034d9SJulian Andres Klode * parse_msg - Print some information and call the notifiers on an RX message 357bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 358bdf034d9SJulian Andres Klode * @msg: A message received by @nvec 359bdf034d9SJulian Andres Klode * 360bdf034d9SJulian Andres Klode * Paarse some pieces of the message and then call the chain of notifiers 361bdf034d9SJulian Andres Klode * registered via nvec_register_notifier. 362bdf034d9SJulian Andres Klode */ 36332890b98SMarc Dietrich static int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) 36432890b98SMarc Dietrich { 36532890b98SMarc Dietrich if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { 366162c7d8cSMarc Dietrich dev_err(nvec->dev, "ec responded %02x %02x %02x %02x\n", 367162c7d8cSMarc Dietrich msg->data[0], msg->data[1], msg->data[2], msg->data[3]); 36832890b98SMarc Dietrich return -EINVAL; 36932890b98SMarc Dietrich } 37032890b98SMarc Dietrich 371a3a9aa1aSMarc Dietrich if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) 372a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "ec system event ", 373a3a9aa1aSMarc Dietrich DUMP_PREFIX_NONE, 16, 1, msg->data, 374a3a9aa1aSMarc Dietrich msg->data[1] + 2, true); 37532890b98SMarc Dietrich 376162c7d8cSMarc Dietrich atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, 377162c7d8cSMarc Dietrich msg->data); 37832890b98SMarc Dietrich 37932890b98SMarc Dietrich return 0; 38032890b98SMarc Dietrich } 38132890b98SMarc Dietrich 382bdf034d9SJulian Andres Klode /** 383bdf034d9SJulian Andres Klode * nvec_dispatch - Process messages received from the EC 384bdf034d9SJulian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 385bdf034d9SJulian Andres Klode * 386bdf034d9SJulian Andres Klode * Process messages previously received from the EC and put into the RX 387bdf034d9SJulian Andres Klode * queue of the &struct nvec_chip instance associated with @work. 388bdf034d9SJulian Andres Klode */ 38932890b98SMarc Dietrich static void nvec_dispatch(struct work_struct *work) 39032890b98SMarc Dietrich { 39132890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); 3920cab4cb8SJulian Andres Klode unsigned long flags; 39332890b98SMarc Dietrich struct nvec_msg *msg; 39432890b98SMarc Dietrich 3950cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 396162c7d8cSMarc Dietrich while (!list_empty(&nvec->rx_data)) { 39732890b98SMarc Dietrich msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); 39832890b98SMarc Dietrich list_del_init(&msg->node); 3990cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 40032890b98SMarc Dietrich 401162c7d8cSMarc Dietrich if (nvec->sync_write_pending == 402162c7d8cSMarc Dietrich (msg->data[2] << 8) + msg->data[0]) { 40332890b98SMarc Dietrich dev_dbg(nvec->dev, "sync write completed!\n"); 40432890b98SMarc Dietrich nvec->sync_write_pending = 0; 40532890b98SMarc Dietrich nvec->last_sync_msg = msg; 40632890b98SMarc Dietrich complete(&nvec->sync_write); 40732890b98SMarc Dietrich } else { 40832890b98SMarc Dietrich parse_msg(nvec, msg); 4090cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 41032890b98SMarc Dietrich } 4110cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 41232890b98SMarc Dietrich } 4130cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 4140cab4cb8SJulian Andres Klode } 4150cab4cb8SJulian Andres Klode 416bdf034d9SJulian Andres Klode /** 417bdf034d9SJulian Andres Klode * nvec_tx_completed - Complete the current transfer 418bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 419bdf034d9SJulian Andres Klode * 420bdf034d9SJulian Andres Klode * This is called when we have received an END_TRANS on a TX transfer. 421bdf034d9SJulian Andres Klode */ 4220cab4cb8SJulian Andres Klode static void nvec_tx_completed(struct nvec_chip *nvec) 4230cab4cb8SJulian Andres Klode { 4240cab4cb8SJulian Andres Klode /* We got an END_TRANS, let's skip this, maybe there's an event */ 4250cab4cb8SJulian Andres Klode if (nvec->tx->pos != nvec->tx->size) { 4260cab4cb8SJulian Andres Klode dev_err(nvec->dev, "premature END_TRANS, resending\n"); 4270cab4cb8SJulian Andres Klode nvec->tx->pos = 0; 4280cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 0); 4290cab4cb8SJulian Andres Klode } else { 4300cab4cb8SJulian Andres Klode nvec->state = 0; 43132890b98SMarc Dietrich } 43232890b98SMarc Dietrich } 43332890b98SMarc Dietrich 434bdf034d9SJulian Andres Klode /** 435bdf034d9SJulian Andres Klode * nvec_rx_completed - Complete the current transfer 436bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 437bdf034d9SJulian Andres Klode * 438bdf034d9SJulian Andres Klode * This is called when we have received an END_TRANS on a RX transfer. 439bdf034d9SJulian Andres Klode */ 4400cab4cb8SJulian Andres Klode static void nvec_rx_completed(struct nvec_chip *nvec) 4410cab4cb8SJulian Andres Klode { 4420cab4cb8SJulian Andres Klode if (nvec->rx->pos != nvec_msg_size(nvec->rx)) 4430cab4cb8SJulian Andres Klode dev_err(nvec->dev, "RX incomplete: Expected %u bytes, got %u\n", 4440cab4cb8SJulian Andres Klode (uint) nvec_msg_size(nvec->rx), 4450cab4cb8SJulian Andres Klode (uint) nvec->rx->pos); 4460cab4cb8SJulian Andres Klode 4470cab4cb8SJulian Andres Klode spin_lock(&nvec->rx_lock); 4480cab4cb8SJulian Andres Klode 4490cab4cb8SJulian Andres Klode /* add the received data to the work list 4500cab4cb8SJulian Andres Klode and move the ring buffer pointer to the next entry */ 4510cab4cb8SJulian Andres Klode list_add_tail(&nvec->rx->node, &nvec->rx_data); 4520cab4cb8SJulian Andres Klode 4530cab4cb8SJulian Andres Klode spin_unlock(&nvec->rx_lock); 4540cab4cb8SJulian Andres Klode 4550cab4cb8SJulian Andres Klode nvec->state = 0; 4560cab4cb8SJulian Andres Klode 4570cab4cb8SJulian Andres Klode if (!nvec_msg_is_event(nvec->rx)) 4580cab4cb8SJulian Andres Klode complete(&nvec->ec_transfer); 4590cab4cb8SJulian Andres Klode 4600cab4cb8SJulian Andres Klode queue_work(nvec->wq, &nvec->rx_work); 4610cab4cb8SJulian Andres Klode } 4620cab4cb8SJulian Andres Klode 4630cab4cb8SJulian Andres Klode /** 4640cab4cb8SJulian Andres Klode * nvec_invalid_flags - Send an error message about invalid flags and jump 4650cab4cb8SJulian Andres Klode * @nvec: The nvec device 4660cab4cb8SJulian Andres Klode * @status: The status flags 4670cab4cb8SJulian Andres Klode * @reset: Whether we shall jump to state 0. 4680cab4cb8SJulian Andres Klode */ 4690cab4cb8SJulian Andres Klode static void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status, 4700cab4cb8SJulian Andres Klode bool reset) 4710cab4cb8SJulian Andres Klode { 4720cab4cb8SJulian Andres Klode dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n", 4730cab4cb8SJulian Andres Klode status, nvec->state); 4740cab4cb8SJulian Andres Klode if (reset) 4750cab4cb8SJulian Andres Klode nvec->state = 0; 4760cab4cb8SJulian Andres Klode } 4770cab4cb8SJulian Andres Klode 4780cab4cb8SJulian Andres Klode /** 4790cab4cb8SJulian Andres Klode * nvec_tx_set - Set the message to transfer (nvec->tx) 480bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 481bdf034d9SJulian Andres Klode * 482bdf034d9SJulian Andres Klode * Gets the first entry from the tx_data list of @nvec and sets the 483bdf034d9SJulian Andres Klode * tx member to it. If the tx_data list is empty, this uses the 484bdf034d9SJulian Andres Klode * tx_scratch message to send a no operation message. 4850cab4cb8SJulian Andres Klode */ 4860cab4cb8SJulian Andres Klode static void nvec_tx_set(struct nvec_chip *nvec) 4870cab4cb8SJulian Andres Klode { 4880cab4cb8SJulian Andres Klode spin_lock(&nvec->tx_lock); 4890cab4cb8SJulian Andres Klode if (list_empty(&nvec->tx_data)) { 4900cab4cb8SJulian Andres Klode dev_err(nvec->dev, "empty tx - sending no-op\n"); 4910cab4cb8SJulian Andres Klode memcpy(nvec->tx_scratch.data, "\x02\x07\x02", 3); 4920cab4cb8SJulian Andres Klode nvec->tx_scratch.size = 3; 4930cab4cb8SJulian Andres Klode nvec->tx_scratch.pos = 0; 4940cab4cb8SJulian Andres Klode nvec->tx = &nvec->tx_scratch; 4950cab4cb8SJulian Andres Klode list_add_tail(&nvec->tx->node, &nvec->tx_data); 4960cab4cb8SJulian Andres Klode } else { 4970cab4cb8SJulian Andres Klode nvec->tx = list_first_entry(&nvec->tx_data, struct nvec_msg, 4980cab4cb8SJulian Andres Klode node); 4990cab4cb8SJulian Andres Klode nvec->tx->pos = 0; 5000cab4cb8SJulian Andres Klode } 5010cab4cb8SJulian Andres Klode spin_unlock(&nvec->tx_lock); 5020cab4cb8SJulian Andres Klode 5030cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "Sending message of length %u, command 0x%x\n", 5040cab4cb8SJulian Andres Klode (uint)nvec->tx->size, nvec->tx->data[1]); 5050cab4cb8SJulian Andres Klode } 5060cab4cb8SJulian Andres Klode 5070cab4cb8SJulian Andres Klode /** 5080cab4cb8SJulian Andres Klode * nvec_interrupt - Interrupt handler 5090cab4cb8SJulian Andres Klode * @irq: The IRQ 5100cab4cb8SJulian Andres Klode * @dev: The nvec device 511bdf034d9SJulian Andres Klode * 512bdf034d9SJulian Andres Klode * Interrupt handler that fills our RX buffers and empties our TX 513bdf034d9SJulian Andres Klode * buffers. This uses a finite state machine with ridiculous amounts 514bdf034d9SJulian Andres Klode * of error checking, in order to be fairly reliable. 5150cab4cb8SJulian Andres Klode */ 516f686e9afSMarc Dietrich static irqreturn_t nvec_interrupt(int irq, void *dev) 51732890b98SMarc Dietrich { 51832890b98SMarc Dietrich unsigned long status; 5190cab4cb8SJulian Andres Klode unsigned int received = 0; 5200cab4cb8SJulian Andres Klode unsigned char to_send = 0xff; 5210cab4cb8SJulian Andres Klode const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW; 5220cab4cb8SJulian Andres Klode struct nvec_chip *nvec = dev; 5230cab4cb8SJulian Andres Klode unsigned int state = nvec->state; 52432890b98SMarc Dietrich 5250cab4cb8SJulian Andres Klode status = readl(nvec->base + I2C_SL_STATUS); 52632890b98SMarc Dietrich 5270cab4cb8SJulian Andres Klode /* Filter out some errors */ 5280cab4cb8SJulian Andres Klode if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) { 5290cab4cb8SJulian Andres Klode dev_err(nvec->dev, "unexpected irq mask %lx\n", status); 53032890b98SMarc Dietrich return IRQ_HANDLED; 5310cab4cb8SJulian Andres Klode } 5320cab4cb8SJulian Andres Klode if ((status & I2C_SL_IRQ) == 0) { 5330cab4cb8SJulian Andres Klode dev_err(nvec->dev, "Spurious IRQ\n"); 5340cab4cb8SJulian Andres Klode return IRQ_HANDLED; 5350cab4cb8SJulian Andres Klode } 5360cab4cb8SJulian Andres Klode 5370cab4cb8SJulian Andres Klode /* The EC did not request a read, so it send us something, read it */ 5380cab4cb8SJulian Andres Klode if ((status & RNW) == 0) { 5390cab4cb8SJulian Andres Klode received = readl(nvec->base + I2C_SL_RCVD); 54032890b98SMarc Dietrich if (status & RCVD) 5410cab4cb8SJulian Andres Klode writel(0, nvec->base + I2C_SL_RCVD); 5420cab4cb8SJulian Andres Klode } 54332890b98SMarc Dietrich 5440cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RCVD)) 5450cab4cb8SJulian Andres Klode nvec->state = 0; 546162c7d8cSMarc Dietrich 5470cab4cb8SJulian Andres Klode switch (nvec->state) { 5480cab4cb8SJulian Andres Klode case 0: /* Verify that its a transfer start, the rest later */ 5490cab4cb8SJulian Andres Klode if (status != (I2C_SL_IRQ | RCVD)) 5500cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, false); 5510cab4cb8SJulian Andres Klode break; 5520cab4cb8SJulian Andres Klode case 1: /* command byte */ 5530cab4cb8SJulian Andres Klode if (status != I2C_SL_IRQ) { 5540cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 55532890b98SMarc Dietrich } else { 556bb0590e2SJulian Andres Klode nvec->rx = nvec_msg_alloc(nvec, NVEC_MSG_RX); 5578da79863SJulian Andres Klode /* Should not happen in a normal world */ 5588da79863SJulian Andres Klode if (unlikely(nvec->rx == NULL)) { 5598da79863SJulian Andres Klode nvec->state = 0; 5608da79863SJulian Andres Klode break; 5618da79863SJulian Andres Klode } 5620cab4cb8SJulian Andres Klode nvec->rx->data[0] = received; 5630cab4cb8SJulian Andres Klode nvec->rx->pos = 1; 5640cab4cb8SJulian Andres Klode nvec->state = 2; 5650cab4cb8SJulian Andres Klode } 5660cab4cb8SJulian Andres Klode break; 5670cab4cb8SJulian Andres Klode case 2: /* first byte after command */ 5680cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) { 5690cab4cb8SJulian Andres Klode udelay(33); 5700cab4cb8SJulian Andres Klode if (nvec->rx->data[0] != 0x01) { 5710cab4cb8SJulian Andres Klode dev_err(nvec->dev, 5720cab4cb8SJulian Andres Klode "Read without prior read command\n"); 5730cab4cb8SJulian Andres Klode nvec->state = 0; 5740cab4cb8SJulian Andres Klode break; 5750cab4cb8SJulian Andres Klode } 5760cab4cb8SJulian Andres Klode nvec_msg_free(nvec, nvec->rx); 5770cab4cb8SJulian Andres Klode nvec->state = 3; 5780cab4cb8SJulian Andres Klode nvec_tx_set(nvec); 5790cab4cb8SJulian Andres Klode BUG_ON(nvec->tx->size < 1); 5800cab4cb8SJulian Andres Klode to_send = nvec->tx->data[0]; 5810cab4cb8SJulian Andres Klode nvec->tx->pos = 1; 5820cab4cb8SJulian Andres Klode } else if (status == (I2C_SL_IRQ)) { 5830cab4cb8SJulian Andres Klode BUG_ON(nvec->rx == NULL); 5840cab4cb8SJulian Andres Klode nvec->rx->data[1] = received; 5850cab4cb8SJulian Andres Klode nvec->rx->pos = 2; 5860cab4cb8SJulian Andres Klode nvec->state = 4; 58732890b98SMarc Dietrich } else { 5880cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 58932890b98SMarc Dietrich } 5900cab4cb8SJulian Andres Klode break; 5910cab4cb8SJulian Andres Klode case 3: /* EC does a block read, we transmit data */ 5920cab4cb8SJulian Andres Klode if (status & END_TRANS) { 5930cab4cb8SJulian Andres Klode nvec_tx_completed(nvec); 5940cab4cb8SJulian Andres Klode } else if ((status & RNW) == 0 || (status & RCVD)) { 5950cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 5960cab4cb8SJulian Andres Klode } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) { 5970cab4cb8SJulian Andres Klode to_send = nvec->tx->data[nvec->tx->pos++]; 59832890b98SMarc Dietrich } else { 5990cab4cb8SJulian Andres Klode dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n", 6000cab4cb8SJulian Andres Klode nvec->tx, 6010cab4cb8SJulian Andres Klode (uint) (nvec->tx ? nvec->tx->pos : 0), 6020cab4cb8SJulian Andres Klode (uint) (nvec->tx ? nvec->tx->size : 0)); 6030cab4cb8SJulian Andres Klode nvec->state = 0; 6040cab4cb8SJulian Andres Klode } 6050cab4cb8SJulian Andres Klode break; 6060cab4cb8SJulian Andres Klode case 4: /* EC does some write, we read the data */ 6070cab4cb8SJulian Andres Klode if ((status & (END_TRANS | RNW)) == END_TRANS) 6080cab4cb8SJulian Andres Klode nvec_rx_completed(nvec); 6090cab4cb8SJulian Andres Klode else if (status & (RNW | RCVD)) 6100cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 6110cab4cb8SJulian Andres Klode else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE) 6120cab4cb8SJulian Andres Klode nvec->rx->data[nvec->rx->pos++] = received; 6130cab4cb8SJulian Andres Klode else 6140cab4cb8SJulian Andres Klode dev_err(nvec->dev, 6150cab4cb8SJulian Andres Klode "RX buffer overflow on %p: " 6160cab4cb8SJulian Andres Klode "Trying to write byte %u of %u\n", 6170cab4cb8SJulian Andres Klode nvec->rx, nvec->rx->pos, NVEC_MSG_SIZE); 6180cab4cb8SJulian Andres Klode break; 6190cab4cb8SJulian Andres Klode default: 6200cab4cb8SJulian Andres Klode nvec->state = 0; 62132890b98SMarc Dietrich } 62232890b98SMarc Dietrich 6230cab4cb8SJulian Andres Klode /* If we are told that a new transfer starts, verify it */ 6240cab4cb8SJulian Andres Klode if ((status & (RCVD | RNW)) == RCVD) { 6250cab4cb8SJulian Andres Klode if (received != nvec->i2c_addr) 6260cab4cb8SJulian Andres Klode dev_err(nvec->dev, 6270cab4cb8SJulian Andres Klode "received address 0x%02x, expected 0x%02x\n", 6280cab4cb8SJulian Andres Klode received, nvec->i2c_addr); 6290cab4cb8SJulian Andres Klode nvec->state = 1; 63032890b98SMarc Dietrich } 6310cab4cb8SJulian Andres Klode 6320cab4cb8SJulian Andres Klode /* Send data if requested, but not on end of transmission */ 6330cab4cb8SJulian Andres Klode if ((status & (RNW | END_TRANS)) == RNW) 6340cab4cb8SJulian Andres Klode writel(to_send, nvec->base + I2C_SL_RCVD); 6350cab4cb8SJulian Andres Klode 6360cab4cb8SJulian Andres Klode /* If we have send the first byte */ 6370cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) 6380cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 1); 6390cab4cb8SJulian Andres Klode 6400cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, 6410cab4cb8SJulian Andres Klode "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n", 6420cab4cb8SJulian Andres Klode (status & RNW) == 0 ? "received" : "R=", 6430cab4cb8SJulian Andres Klode received, 6440cab4cb8SJulian Andres Klode (status & (RNW | END_TRANS)) ? "sent" : "S=", 6450cab4cb8SJulian Andres Klode to_send, 6460cab4cb8SJulian Andres Klode state, 6470cab4cb8SJulian Andres Klode status & END_TRANS ? " END_TRANS" : "", 6480cab4cb8SJulian Andres Klode status & RCVD ? " RCVD" : "", 6490cab4cb8SJulian Andres Klode status & RNW ? " RNW" : ""); 6500cab4cb8SJulian Andres Klode 65132890b98SMarc Dietrich return IRQ_HANDLED; 65232890b98SMarc Dietrich } 65332890b98SMarc Dietrich 654f686e9afSMarc Dietrich static void tegra_init_i2c_slave(struct nvec_chip *nvec) 65532890b98SMarc Dietrich { 65632890b98SMarc Dietrich u32 val; 65732890b98SMarc Dietrich 658f686e9afSMarc Dietrich clk_enable(nvec->i2c_clk); 659f686e9afSMarc Dietrich 660f686e9afSMarc Dietrich tegra_periph_reset_assert(nvec->i2c_clk); 66132890b98SMarc Dietrich udelay(2); 662f686e9afSMarc Dietrich tegra_periph_reset_deassert(nvec->i2c_clk); 66332890b98SMarc Dietrich 66432890b98SMarc Dietrich val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | 66532890b98SMarc Dietrich (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); 666f686e9afSMarc Dietrich writel(val, nvec->base + I2C_CNFG); 66732890b98SMarc Dietrich 668ac810759SMarc Dietrich clk_set_rate(nvec->i2c_clk, 8 * 80000); 669ac810759SMarc Dietrich 670ac810759SMarc Dietrich writel(I2C_SL_NEWL, nvec->base + I2C_SL_CNFG); 671ac810759SMarc Dietrich writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); 672ac810759SMarc Dietrich 673ac810759SMarc Dietrich writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); 674ac810759SMarc Dietrich writel(0, nvec->base + I2C_SL_ADDR2); 675ac810759SMarc Dietrich 676ac810759SMarc Dietrich enable_irq(nvec->irq); 677ac810759SMarc Dietrich 678ac810759SMarc Dietrich clk_disable(nvec->i2c_clk); 679ac810759SMarc Dietrich } 680ac810759SMarc Dietrich 681ac810759SMarc Dietrich static void nvec_disable_i2c_slave(struct nvec_chip *nvec) 682ac810759SMarc Dietrich { 683ac810759SMarc Dietrich disable_irq(nvec->irq); 684ac810759SMarc Dietrich writel(I2C_SL_NEWL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); 685f686e9afSMarc Dietrich clk_disable(nvec->i2c_clk); 68632890b98SMarc Dietrich } 68732890b98SMarc Dietrich 68832890b98SMarc Dietrich static void nvec_power_off(void) 68932890b98SMarc Dietrich { 69032890b98SMarc Dietrich nvec_write_async(nvec_power_handle, EC_DISABLE_EVENT_REPORTING, 3); 69132890b98SMarc Dietrich nvec_write_async(nvec_power_handle, "\x04\x01", 2); 69232890b98SMarc Dietrich } 69332890b98SMarc Dietrich 69432890b98SMarc Dietrich static int __devinit tegra_nvec_probe(struct platform_device *pdev) 69532890b98SMarc Dietrich { 696f686e9afSMarc Dietrich int err, ret; 69732890b98SMarc Dietrich struct clk *i2c_clk; 69832890b98SMarc Dietrich struct nvec_platform_data *pdata = pdev->dev.platform_data; 69932890b98SMarc Dietrich struct nvec_chip *nvec; 70032890b98SMarc Dietrich struct nvec_msg *msg; 701f686e9afSMarc Dietrich struct resource *res; 702f686e9afSMarc Dietrich struct resource *iomem; 703f686e9afSMarc Dietrich void __iomem *base; 70432890b98SMarc Dietrich 70532890b98SMarc Dietrich nvec = kzalloc(sizeof(struct nvec_chip), GFP_KERNEL); 70632890b98SMarc Dietrich if (nvec == NULL) { 70732890b98SMarc Dietrich dev_err(&pdev->dev, "failed to reserve memory\n"); 70832890b98SMarc Dietrich return -ENOMEM; 70932890b98SMarc Dietrich } 71032890b98SMarc Dietrich platform_set_drvdata(pdev, nvec); 71132890b98SMarc Dietrich nvec->dev = &pdev->dev; 71232890b98SMarc Dietrich nvec->gpio = pdata->gpio; 713f686e9afSMarc Dietrich nvec->i2c_addr = pdata->i2c_addr; 71432890b98SMarc Dietrich 715f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 716f686e9afSMarc Dietrich if (!res) { 717f686e9afSMarc Dietrich dev_err(&pdev->dev, "no mem resource?\n"); 718f686e9afSMarc Dietrich return -ENODEV; 71932890b98SMarc Dietrich } 72032890b98SMarc Dietrich 721f686e9afSMarc Dietrich iomem = request_mem_region(res->start, resource_size(res), pdev->name); 722f686e9afSMarc Dietrich if (!iomem) { 723f686e9afSMarc Dietrich dev_err(&pdev->dev, "I2C region already claimed\n"); 724f686e9afSMarc Dietrich return -EBUSY; 72532890b98SMarc Dietrich } 72632890b98SMarc Dietrich 727f686e9afSMarc Dietrich base = ioremap(iomem->start, resource_size(iomem)); 728f686e9afSMarc Dietrich if (!base) { 729f686e9afSMarc Dietrich dev_err(&pdev->dev, "Can't ioremap I2C region\n"); 730f686e9afSMarc Dietrich return -ENOMEM; 731f686e9afSMarc Dietrich } 73232890b98SMarc Dietrich 733f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 734f686e9afSMarc Dietrich if (!res) { 735f686e9afSMarc Dietrich dev_err(&pdev->dev, "no irq resource?\n"); 736f686e9afSMarc Dietrich ret = -ENODEV; 737f686e9afSMarc Dietrich goto err_iounmap; 738f686e9afSMarc Dietrich } 739f686e9afSMarc Dietrich 740f686e9afSMarc Dietrich i2c_clk = clk_get_sys("tegra-i2c.2", NULL); 741f686e9afSMarc Dietrich if (IS_ERR(i2c_clk)) { 742f686e9afSMarc Dietrich dev_err(nvec->dev, "failed to get controller clock\n"); 743f686e9afSMarc Dietrich goto err_iounmap; 74432890b98SMarc Dietrich } 74532890b98SMarc Dietrich 746f686e9afSMarc Dietrich nvec->base = base; 747f686e9afSMarc Dietrich nvec->irq = res->start; 748f686e9afSMarc Dietrich nvec->i2c_clk = i2c_clk; 7490cab4cb8SJulian Andres Klode nvec->rx = &nvec->msg_pool[0]; 750f686e9afSMarc Dietrich 75132890b98SMarc Dietrich /* Set the gpio to low when we've got something to say */ 75232890b98SMarc Dietrich err = gpio_request(nvec->gpio, "nvec gpio"); 75332890b98SMarc Dietrich if (err < 0) 75432890b98SMarc Dietrich dev_err(nvec->dev, "couldn't request gpio\n"); 75532890b98SMarc Dietrich 75632890b98SMarc Dietrich ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); 75732890b98SMarc Dietrich 75832890b98SMarc Dietrich init_completion(&nvec->sync_write); 7590cab4cb8SJulian Andres Klode init_completion(&nvec->ec_transfer); 7600cab4cb8SJulian Andres Klode mutex_init(&nvec->sync_write_mutex); 7610cab4cb8SJulian Andres Klode spin_lock_init(&nvec->tx_lock); 7620cab4cb8SJulian Andres Klode spin_lock_init(&nvec->rx_lock); 76332890b98SMarc Dietrich INIT_LIST_HEAD(&nvec->rx_data); 7640cab4cb8SJulian Andres Klode INIT_LIST_HEAD(&nvec->tx_data); 76532890b98SMarc Dietrich INIT_WORK(&nvec->rx_work, nvec_dispatch); 76632890b98SMarc Dietrich INIT_WORK(&nvec->tx_work, nvec_request_master); 7670cab4cb8SJulian Andres Klode nvec->wq = alloc_workqueue("nvec", WQ_NON_REENTRANT, 2); 76832890b98SMarc Dietrich 769f686e9afSMarc Dietrich err = request_irq(nvec->irq, nvec_interrupt, 0, "nvec", nvec); 770f686e9afSMarc Dietrich if (err) { 771f686e9afSMarc Dietrich dev_err(nvec->dev, "couldn't request irq\n"); 772f686e9afSMarc Dietrich goto failed; 773f686e9afSMarc Dietrich } 774ac810759SMarc Dietrich disable_irq(nvec->irq); 775f686e9afSMarc Dietrich 776f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 777f686e9afSMarc Dietrich 778ac810759SMarc Dietrich clk_enable(i2c_clk); 779ac810759SMarc Dietrich 780f686e9afSMarc Dietrich gpio_direction_output(nvec->gpio, 1); 781f686e9afSMarc Dietrich gpio_set_value(nvec->gpio, 1); 782f686e9afSMarc Dietrich 78332890b98SMarc Dietrich /* enable event reporting */ 78432890b98SMarc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 78532890b98SMarc Dietrich sizeof(EC_ENABLE_EVENT_REPORTING)); 78632890b98SMarc Dietrich 78732890b98SMarc Dietrich nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; 78832890b98SMarc Dietrich nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); 78932890b98SMarc Dietrich 79032890b98SMarc Dietrich nvec_power_handle = nvec; 79132890b98SMarc Dietrich pm_power_off = nvec_power_off; 79232890b98SMarc Dietrich 79332890b98SMarc Dietrich /* Get Firmware Version */ 79432890b98SMarc Dietrich msg = nvec_write_sync(nvec, EC_GET_FIRMWARE_VERSION, 79532890b98SMarc Dietrich sizeof(EC_GET_FIRMWARE_VERSION)); 79632890b98SMarc Dietrich 7970cab4cb8SJulian Andres Klode if (msg) { 79832890b98SMarc Dietrich dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", 79932890b98SMarc Dietrich msg->data[4], msg->data[5], msg->data[6], msg->data[7]); 80032890b98SMarc Dietrich 8010cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 8020cab4cb8SJulian Andres Klode } 80332890b98SMarc Dietrich 804f686e9afSMarc Dietrich ret = mfd_add_devices(nvec->dev, -1, nvec_devices, 805f686e9afSMarc Dietrich ARRAY_SIZE(nvec_devices), base, 0); 806f686e9afSMarc Dietrich if (ret) 807f686e9afSMarc Dietrich dev_err(nvec->dev, "error adding subdevices\n"); 808f686e9afSMarc Dietrich 80932890b98SMarc Dietrich /* unmute speakers? */ 8106dca320cSMarc Dietrich nvec_write_async(nvec, "\x0d\x10\x59\x95", 4); 81132890b98SMarc Dietrich 81232890b98SMarc Dietrich /* enable lid switch event */ 81332890b98SMarc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x02\x00", 7); 81432890b98SMarc Dietrich 81532890b98SMarc Dietrich /* enable power button event */ 81632890b98SMarc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x80\x00", 7); 81732890b98SMarc Dietrich 81832890b98SMarc Dietrich return 0; 81932890b98SMarc Dietrich 820f686e9afSMarc Dietrich err_iounmap: 821f686e9afSMarc Dietrich iounmap(base); 82232890b98SMarc Dietrich failed: 82332890b98SMarc Dietrich kfree(nvec); 82432890b98SMarc Dietrich return -ENOMEM; 82532890b98SMarc Dietrich } 82632890b98SMarc Dietrich 82732890b98SMarc Dietrich static int __devexit tegra_nvec_remove(struct platform_device *pdev) 82832890b98SMarc Dietrich { 829f686e9afSMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 830f686e9afSMarc Dietrich 831f686e9afSMarc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 832f686e9afSMarc Dietrich mfd_remove_devices(nvec->dev); 833f686e9afSMarc Dietrich free_irq(nvec->irq, &nvec_interrupt); 834f686e9afSMarc Dietrich iounmap(nvec->base); 835f686e9afSMarc Dietrich gpio_free(nvec->gpio); 8360cab4cb8SJulian Andres Klode destroy_workqueue(nvec->wq); 837f686e9afSMarc Dietrich kfree(nvec); 838f686e9afSMarc Dietrich 83932890b98SMarc Dietrich return 0; 84032890b98SMarc Dietrich } 84132890b98SMarc Dietrich 84232890b98SMarc Dietrich #ifdef CONFIG_PM 84332890b98SMarc Dietrich 84432890b98SMarc Dietrich static int tegra_nvec_suspend(struct platform_device *pdev, pm_message_t state) 84532890b98SMarc Dietrich { 84632890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 84732890b98SMarc Dietrich 84832890b98SMarc Dietrich dev_dbg(nvec->dev, "suspending\n"); 84932890b98SMarc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 85032890b98SMarc Dietrich nvec_write_async(nvec, "\x04\x02", 2); 851ac810759SMarc Dietrich nvec_disable_i2c_slave(nvec); 85232890b98SMarc Dietrich 85332890b98SMarc Dietrich return 0; 85432890b98SMarc Dietrich } 85532890b98SMarc Dietrich 856162c7d8cSMarc Dietrich static int tegra_nvec_resume(struct platform_device *pdev) 857162c7d8cSMarc Dietrich { 85832890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 85932890b98SMarc Dietrich 86032890b98SMarc Dietrich dev_dbg(nvec->dev, "resuming\n"); 861f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 86232890b98SMarc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 3); 86332890b98SMarc Dietrich 86432890b98SMarc Dietrich return 0; 86532890b98SMarc Dietrich } 86632890b98SMarc Dietrich 86732890b98SMarc Dietrich #else 86832890b98SMarc Dietrich #define tegra_nvec_suspend NULL 86932890b98SMarc Dietrich #define tegra_nvec_resume NULL 87032890b98SMarc Dietrich #endif 87132890b98SMarc Dietrich 872162c7d8cSMarc Dietrich static struct platform_driver nvec_device_driver = { 87332890b98SMarc Dietrich .probe = tegra_nvec_probe, 87432890b98SMarc Dietrich .remove = __devexit_p(tegra_nvec_remove), 87532890b98SMarc Dietrich .suspend = tegra_nvec_suspend, 87632890b98SMarc Dietrich .resume = tegra_nvec_resume, 87732890b98SMarc Dietrich .driver = { 87832890b98SMarc Dietrich .name = "nvec", 87932890b98SMarc Dietrich .owner = THIS_MODULE, 88032890b98SMarc Dietrich } 88132890b98SMarc Dietrich }; 88232890b98SMarc Dietrich 88332890b98SMarc Dietrich static int __init tegra_nvec_init(void) 88432890b98SMarc Dietrich { 88532890b98SMarc Dietrich return platform_driver_register(&nvec_device_driver); 88632890b98SMarc Dietrich } 88732890b98SMarc Dietrich 88832890b98SMarc Dietrich module_init(tegra_nvec_init); 889162c7d8cSMarc Dietrich 89032890b98SMarc Dietrich MODULE_ALIAS("platform:nvec"); 891162c7d8cSMarc Dietrich MODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); 892162c7d8cSMarc Dietrich MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); 893162c7d8cSMarc Dietrich MODULE_LICENSE("GPL"); 894