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 1912b5a55dSJulian Andres Klode #include <linux/kernel.h> 203b769eddSMarc Dietrich #include <linux/module.h> 210b1076c4SJulian Andres Klode #include <linux/atomic.h> 2212b5a55dSJulian Andres Klode #include <linux/clk.h> 2332890b98SMarc Dietrich #include <linux/completion.h> 2412b5a55dSJulian Andres Klode #include <linux/delay.h> 2512b5a55dSJulian Andres Klode #include <linux/err.h> 2612b5a55dSJulian Andres Klode #include <linux/gpio.h> 2732890b98SMarc Dietrich #include <linux/interrupt.h> 28162c7d8cSMarc Dietrich #include <linux/io.h> 2932890b98SMarc Dietrich #include <linux/irq.h> 307990b0d7SMarc Dietrich #include <linux/of.h> 317990b0d7SMarc Dietrich #include <linux/of_gpio.h> 3232890b98SMarc Dietrich #include <linux/list.h> 3312b5a55dSJulian Andres Klode #include <linux/mfd/core.h> 3412b5a55dSJulian Andres Klode #include <linux/mutex.h> 3532890b98SMarc Dietrich #include <linux/notifier.h> 3632890b98SMarc Dietrich #include <linux/platform_device.h> 3712b5a55dSJulian Andres Klode #include <linux/slab.h> 3812b5a55dSJulian Andres Klode #include <linux/spinlock.h> 3912b5a55dSJulian Andres Klode #include <linux/workqueue.h> 40162c7d8cSMarc Dietrich 41162c7d8cSMarc Dietrich #include <mach/clk.h> 4212b5a55dSJulian Andres Klode #include <mach/iomap.h> 43162c7d8cSMarc Dietrich 4432890b98SMarc Dietrich #include "nvec.h" 4532890b98SMarc Dietrich 46391d2fa9SJulian Andres Klode #define I2C_CNFG 0x00 47391d2fa9SJulian Andres Klode #define I2C_CNFG_PACKET_MODE_EN (1<<10) 48391d2fa9SJulian Andres Klode #define I2C_CNFG_NEW_MASTER_SFM (1<<11) 49391d2fa9SJulian Andres Klode #define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12 50391d2fa9SJulian Andres Klode 51391d2fa9SJulian Andres Klode #define I2C_SL_CNFG 0x20 52391d2fa9SJulian Andres Klode #define I2C_SL_NEWL (1<<2) 53391d2fa9SJulian Andres Klode #define I2C_SL_NACK (1<<1) 54391d2fa9SJulian Andres Klode #define I2C_SL_RESP (1<<0) 55391d2fa9SJulian Andres Klode #define I2C_SL_IRQ (1<<3) 56391d2fa9SJulian Andres Klode #define END_TRANS (1<<4) 57391d2fa9SJulian Andres Klode #define RCVD (1<<2) 58391d2fa9SJulian Andres Klode #define RNW (1<<1) 59391d2fa9SJulian Andres Klode 60391d2fa9SJulian Andres Klode #define I2C_SL_RCVD 0x24 61391d2fa9SJulian Andres Klode #define I2C_SL_STATUS 0x28 62391d2fa9SJulian Andres Klode #define I2C_SL_ADDR1 0x2c 63391d2fa9SJulian Andres Klode #define I2C_SL_ADDR2 0x30 64391d2fa9SJulian Andres Klode #define I2C_SL_DELAY_COUNT 0x3c 65391d2fa9SJulian Andres Klode 66bb0590e2SJulian Andres Klode /** 67bb0590e2SJulian Andres Klode * enum nvec_msg_category - Message categories for nvec_msg_alloc() 68bb0590e2SJulian Andres Klode * @NVEC_MSG_RX: The message is an incoming message (from EC) 69bb0590e2SJulian Andres Klode * @NVEC_MSG_TX: The message is an outgoing message (to EC) 70bb0590e2SJulian Andres Klode */ 71bb0590e2SJulian Andres Klode enum nvec_msg_category { 72bb0590e2SJulian Andres Klode NVEC_MSG_RX, 73bb0590e2SJulian Andres Klode NVEC_MSG_TX, 74bb0590e2SJulian Andres Klode }; 75bb0590e2SJulian Andres Klode 76162c7d8cSMarc Dietrich static const unsigned char EC_DISABLE_EVENT_REPORTING[3] = "\x04\x00\x00"; 77162c7d8cSMarc Dietrich static const unsigned char EC_ENABLE_EVENT_REPORTING[3] = "\x04\x00\x01"; 78162c7d8cSMarc Dietrich static const unsigned char EC_GET_FIRMWARE_VERSION[2] = "\x07\x15"; 7932890b98SMarc Dietrich 8032890b98SMarc Dietrich static struct nvec_chip *nvec_power_handle; 8132890b98SMarc Dietrich 82f686e9afSMarc Dietrich static struct mfd_cell nvec_devices[] = { 83f686e9afSMarc Dietrich { 84f686e9afSMarc Dietrich .name = "nvec-kbd", 85f686e9afSMarc Dietrich .id = 1, 86f686e9afSMarc Dietrich }, 87f686e9afSMarc Dietrich { 88f686e9afSMarc Dietrich .name = "nvec-mouse", 89f686e9afSMarc Dietrich .id = 1, 90f686e9afSMarc Dietrich }, 91f686e9afSMarc Dietrich { 92f686e9afSMarc Dietrich .name = "nvec-power", 93f686e9afSMarc Dietrich .id = 1, 94f686e9afSMarc Dietrich }, 95f686e9afSMarc Dietrich { 96f686e9afSMarc Dietrich .name = "nvec-power", 97f686e9afSMarc Dietrich .id = 2, 98f686e9afSMarc Dietrich }, 9997cc2657SIlya Petrov { 10097cc2657SIlya Petrov .name = "nvec-leds", 10197cc2657SIlya Petrov .id = 1, 10297cc2657SIlya Petrov }, 103f686e9afSMarc Dietrich }; 104f686e9afSMarc Dietrich 105bdf034d9SJulian Andres Klode /** 106bdf034d9SJulian Andres Klode * nvec_register_notifier - Register a notifier with nvec 107bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 108bdf034d9SJulian Andres Klode * @nb: The notifier block to register 109bdf034d9SJulian Andres Klode * 110bdf034d9SJulian Andres Klode * Registers a notifier with @nvec. The notifier will be added to an atomic 111bdf034d9SJulian Andres Klode * notifier chain that is called for all received messages except those that 112bdf034d9SJulian Andres Klode * correspond to a request initiated by nvec_write_sync(). 113bdf034d9SJulian Andres Klode */ 11432890b98SMarc Dietrich int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, 11532890b98SMarc Dietrich unsigned int events) 11632890b98SMarc Dietrich { 11732890b98SMarc Dietrich return atomic_notifier_chain_register(&nvec->notifier_list, nb); 11832890b98SMarc Dietrich } 11932890b98SMarc Dietrich EXPORT_SYMBOL_GPL(nvec_register_notifier); 12032890b98SMarc Dietrich 121bdf034d9SJulian Andres Klode /** 122bdf034d9SJulian Andres Klode * nvec_status_notifier - The final notifier 123bdf034d9SJulian Andres Klode * 124bdf034d9SJulian Andres Klode * Prints a message about control events not handled in the notifier 125bdf034d9SJulian Andres Klode * chain. 126bdf034d9SJulian Andres Klode */ 127162c7d8cSMarc Dietrich static int nvec_status_notifier(struct notifier_block *nb, 128162c7d8cSMarc Dietrich unsigned long event_type, void *data) 12932890b98SMarc Dietrich { 13032890b98SMarc Dietrich unsigned char *msg = (unsigned char *)data; 13132890b98SMarc Dietrich 13232890b98SMarc Dietrich if (event_type != NVEC_CNTL) 13332890b98SMarc Dietrich return NOTIFY_DONE; 13432890b98SMarc Dietrich 135a3a9aa1aSMarc Dietrich printk(KERN_WARNING "unhandled msg type %ld\n", event_type); 136a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "payload: ", DUMP_PREFIX_NONE, 16, 1, 137a3a9aa1aSMarc Dietrich msg, msg[1] + 2, true); 13832890b98SMarc Dietrich 13932890b98SMarc Dietrich return NOTIFY_OK; 14032890b98SMarc Dietrich } 14132890b98SMarc Dietrich 142bdf034d9SJulian Andres Klode /** 143bdf034d9SJulian Andres Klode * nvec_msg_alloc: 144bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 145bb0590e2SJulian Andres Klode * @category: Pool category, see &enum nvec_msg_category 146bdf034d9SJulian Andres Klode * 147bdf034d9SJulian Andres Klode * Allocate a single &struct nvec_msg object from the message pool of 148bdf034d9SJulian Andres Klode * @nvec. The result shall be passed to nvec_msg_free() if no longer 149bdf034d9SJulian Andres Klode * used. 150bb0590e2SJulian Andres Klode * 151bb0590e2SJulian Andres Klode * Outgoing messages are placed in the upper 75% of the pool, keeping the 152bb0590e2SJulian Andres Klode * lower 25% available for RX buffers only. The reason is to prevent a 153bb0590e2SJulian Andres Klode * situation where all buffers are full and a message is thus endlessly 154bb0590e2SJulian Andres Klode * retried because the response could never be processed. 155bdf034d9SJulian Andres Klode */ 156bb0590e2SJulian Andres Klode static struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec, 157bb0590e2SJulian Andres Klode enum nvec_msg_category category) 1580b1076c4SJulian Andres Klode { 159bb0590e2SJulian Andres Klode int i = (category == NVEC_MSG_TX) ? (NVEC_POOL_SIZE / 4) : 0; 1600b1076c4SJulian Andres Klode 161bb0590e2SJulian Andres Klode for (; i < NVEC_POOL_SIZE; i++) { 1620b1076c4SJulian Andres Klode if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { 1630b1076c4SJulian Andres Klode dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); 1640b1076c4SJulian Andres Klode return &nvec->msg_pool[i]; 1650b1076c4SJulian Andres Klode } 1660b1076c4SJulian Andres Klode } 1670b1076c4SJulian Andres Klode 168bb0590e2SJulian Andres Klode dev_err(nvec->dev, "could not allocate %s buffer\n", 169bb0590e2SJulian Andres Klode (category == NVEC_MSG_TX) ? "TX" : "RX"); 1700b1076c4SJulian Andres Klode 1710b1076c4SJulian Andres Klode return NULL; 1720b1076c4SJulian Andres Klode } 1730b1076c4SJulian Andres Klode 174bdf034d9SJulian Andres Klode /** 175bdf034d9SJulian Andres Klode * nvec_msg_free: 176bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 177bdf034d9SJulian Andres Klode * @msg: A message (must be allocated by nvec_msg_alloc() and belong to @nvec) 178bdf034d9SJulian Andres Klode * 179bdf034d9SJulian Andres Klode * Free the given message 180bdf034d9SJulian Andres Klode */ 181198dd267SJulian Andres Klode inline void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) 1820b1076c4SJulian Andres Klode { 1837b770657SJulian Andres Klode if (msg != &nvec->tx_scratch) 1840b1076c4SJulian Andres Klode dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); 1850b1076c4SJulian Andres Klode atomic_set(&msg->used, 0); 1860b1076c4SJulian Andres Klode } 187198dd267SJulian Andres Klode EXPORT_SYMBOL_GPL(nvec_msg_free); 1880b1076c4SJulian Andres Klode 1898517e879SJulian Andres Klode /** 1908517e879SJulian Andres Klode * nvec_msg_is_event - Return %true if @msg is an event 1918517e879SJulian Andres Klode * @msg: A message 1928517e879SJulian Andres Klode */ 1938517e879SJulian Andres Klode static bool nvec_msg_is_event(struct nvec_msg *msg) 1948517e879SJulian Andres Klode { 1958517e879SJulian Andres Klode return msg->data[0] >> 7; 1968517e879SJulian Andres Klode } 1978517e879SJulian Andres Klode 1988517e879SJulian Andres Klode /** 1998517e879SJulian Andres Klode * nvec_msg_size - Get the size of a message 2008517e879SJulian Andres Klode * @msg: The message to get the size for 2018517e879SJulian Andres Klode * 2028517e879SJulian Andres Klode * This only works for received messages, not for outgoing messages. 2038517e879SJulian Andres Klode */ 2048517e879SJulian Andres Klode static size_t nvec_msg_size(struct nvec_msg *msg) 2058517e879SJulian Andres Klode { 2068517e879SJulian Andres Klode bool is_event = nvec_msg_is_event(msg); 2078517e879SJulian Andres Klode int event_length = (msg->data[0] & 0x60) >> 5; 2088517e879SJulian Andres Klode 2098517e879SJulian Andres Klode /* for variable size, payload size in byte 1 + count (1) + cmd (1) */ 2108517e879SJulian Andres Klode if (!is_event || event_length == NVEC_VAR_SIZE) 2118517e879SJulian Andres Klode return (msg->pos || msg->size) ? (msg->data[1] + 2) : 0; 2128517e879SJulian Andres Klode else if (event_length == NVEC_2BYTES) 2138517e879SJulian Andres Klode return 2; 2148517e879SJulian Andres Klode else if (event_length == NVEC_3BYTES) 2158517e879SJulian Andres Klode return 3; 2168517e879SJulian Andres Klode else 2178517e879SJulian Andres Klode return 0; 2188517e879SJulian Andres Klode } 2198517e879SJulian Andres Klode 220bdf034d9SJulian Andres Klode /** 221bdf034d9SJulian Andres Klode * nvec_gpio_set_value - Set the GPIO value 222bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 223bdf034d9SJulian Andres Klode * @value: The value to write (0 or 1) 224bdf034d9SJulian Andres Klode * 225bdf034d9SJulian Andres Klode * Like gpio_set_value(), but generating debugging information 226bdf034d9SJulian Andres Klode */ 227e7c40851SJulian Andres Klode static void nvec_gpio_set_value(struct nvec_chip *nvec, int value) 228e7c40851SJulian Andres Klode { 229e7c40851SJulian Andres Klode dev_dbg(nvec->dev, "GPIO changed from %u to %u\n", 230e7c40851SJulian Andres Klode gpio_get_value(nvec->gpio), value); 231e7c40851SJulian Andres Klode gpio_set_value(nvec->gpio, value); 232e7c40851SJulian Andres Klode } 233e7c40851SJulian Andres Klode 234bdf034d9SJulian Andres Klode /** 235bdf034d9SJulian Andres Klode * nvec_write_async - Asynchronously write a message to NVEC 236bdf034d9SJulian Andres Klode * @nvec: An nvec_chip instance 237bdf034d9SJulian Andres Klode * @data: The message data, starting with the request type 238bdf034d9SJulian Andres Klode * @size: The size of @data 239bdf034d9SJulian Andres Klode * 240bdf034d9SJulian Andres Klode * Queue a single message to be transferred to the embedded controller 241bdf034d9SJulian Andres Klode * and return immediately. 242bdf034d9SJulian Andres Klode * 243bdf034d9SJulian Andres Klode * Returns: 0 on success, a negative error code on failure. If a failure 244bdf034d9SJulian Andres Klode * occured, the nvec driver may print an error. 245bdf034d9SJulian Andres Klode */ 2461b9bf629SJulian Andres Klode int nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, 247162c7d8cSMarc Dietrich short size) 24832890b98SMarc Dietrich { 2490cab4cb8SJulian Andres Klode struct nvec_msg *msg; 2500cab4cb8SJulian Andres Klode unsigned long flags; 25132890b98SMarc Dietrich 252bb0590e2SJulian Andres Klode msg = nvec_msg_alloc(nvec, NVEC_MSG_TX); 253bb0590e2SJulian Andres Klode 2541b9bf629SJulian Andres Klode if (msg == NULL) 2551b9bf629SJulian Andres Klode return -ENOMEM; 2561b9bf629SJulian Andres Klode 25732890b98SMarc Dietrich msg->data[0] = size; 25832890b98SMarc Dietrich memcpy(msg->data + 1, data, size); 25932890b98SMarc Dietrich msg->size = size + 1; 26032890b98SMarc Dietrich 2610cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 26232890b98SMarc Dietrich list_add_tail(&msg->node, &nvec->tx_data); 2630cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 26432890b98SMarc Dietrich 2650cab4cb8SJulian Andres Klode queue_work(nvec->wq, &nvec->tx_work); 2661b9bf629SJulian Andres Klode 2671b9bf629SJulian Andres Klode return 0; 26832890b98SMarc Dietrich } 26932890b98SMarc Dietrich EXPORT_SYMBOL(nvec_write_async); 27032890b98SMarc Dietrich 271bdf034d9SJulian Andres Klode /** 272bdf034d9SJulian Andres Klode * nvec_write_sync - Write a message to nvec and read the response 273bdf034d9SJulian Andres Klode * @nvec: An &struct nvec_chip 274bdf034d9SJulian Andres Klode * @data: The data to write 275bdf034d9SJulian Andres Klode * @size: The size of @data 276bdf034d9SJulian Andres Klode * 277bdf034d9SJulian Andres Klode * This is similar to nvec_write_async(), but waits for the 278bdf034d9SJulian Andres Klode * request to be answered before returning. This function 279bdf034d9SJulian Andres Klode * uses a mutex and can thus not be called from e.g. 280bdf034d9SJulian Andres Klode * interrupt handlers. 281bdf034d9SJulian Andres Klode * 282bdf034d9SJulian Andres Klode * Returns: A pointer to the response message on success, 283198dd267SJulian Andres Klode * %NULL on failure. Free with nvec_msg_free() once no longer 284198dd267SJulian Andres Klode * used. 285bdf034d9SJulian Andres Klode */ 2860cab4cb8SJulian Andres Klode struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, 2870cab4cb8SJulian Andres Klode const unsigned char *data, short size) 2880cab4cb8SJulian Andres Klode { 2890cab4cb8SJulian Andres Klode struct nvec_msg *msg; 2900cab4cb8SJulian Andres Klode 2910cab4cb8SJulian Andres Klode mutex_lock(&nvec->sync_write_mutex); 2920cab4cb8SJulian Andres Klode 2930cab4cb8SJulian Andres Klode nvec->sync_write_pending = (data[1] << 8) + data[0]; 2941b9bf629SJulian Andres Klode 2951b9bf629SJulian Andres Klode if (nvec_write_async(nvec, data, size) < 0) 2961b9bf629SJulian Andres Klode return NULL; 2970cab4cb8SJulian Andres Klode 2980cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", 2990cab4cb8SJulian Andres Klode nvec->sync_write_pending); 3000cab4cb8SJulian Andres Klode if (!(wait_for_completion_timeout(&nvec->sync_write, 3010cab4cb8SJulian Andres Klode msecs_to_jiffies(2000)))) { 3020cab4cb8SJulian Andres Klode dev_warn(nvec->dev, "timeout waiting for sync write to complete\n"); 3030cab4cb8SJulian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3040cab4cb8SJulian Andres Klode return NULL; 3050cab4cb8SJulian Andres Klode } 3060cab4cb8SJulian Andres Klode 3070cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); 3080cab4cb8SJulian Andres Klode 3090cab4cb8SJulian Andres Klode msg = nvec->last_sync_msg; 3100cab4cb8SJulian Andres Klode 3110cab4cb8SJulian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3120cab4cb8SJulian Andres Klode 3130cab4cb8SJulian Andres Klode return msg; 3140cab4cb8SJulian Andres Klode } 3150cab4cb8SJulian Andres Klode EXPORT_SYMBOL(nvec_write_sync); 3160cab4cb8SJulian Andres Klode 317bdf034d9SJulian Andres Klode /** 318bdf034d9SJulian Andres Klode * nvec_request_master - Process outgoing messages 319bdf034d9SJulian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 320bdf034d9SJulian Andres Klode * 321bdf034d9SJulian Andres Klode * Processes all outgoing requests by sending the request and awaiting the 322bdf034d9SJulian Andres Klode * response, then continuing with the next request. Once a request has a 323bdf034d9SJulian Andres Klode * matching response, it will be freed and removed from the list. 324bdf034d9SJulian Andres Klode */ 32532890b98SMarc Dietrich static void nvec_request_master(struct work_struct *work) 32632890b98SMarc Dietrich { 32732890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); 3280cab4cb8SJulian Andres Klode unsigned long flags; 3290cab4cb8SJulian Andres Klode long err; 3300cab4cb8SJulian Andres Klode struct nvec_msg *msg; 33132890b98SMarc Dietrich 3320cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3330cab4cb8SJulian Andres Klode while (!list_empty(&nvec->tx_data)) { 3340cab4cb8SJulian Andres Klode msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); 3350cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 3360cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 0); 3370cab4cb8SJulian Andres Klode err = wait_for_completion_interruptible_timeout( 3380cab4cb8SJulian Andres Klode &nvec->ec_transfer, msecs_to_jiffies(5000)); 3390cab4cb8SJulian Andres Klode 3400cab4cb8SJulian Andres Klode if (err == 0) { 3410cab4cb8SJulian Andres Klode dev_warn(nvec->dev, "timeout waiting for ec transfer\n"); 3420cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 1); 3430cab4cb8SJulian Andres Klode msg->pos = 0; 3440cab4cb8SJulian Andres Klode } 3450cab4cb8SJulian Andres Klode 3460cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3470cab4cb8SJulian Andres Klode 3480cab4cb8SJulian Andres Klode if (err > 0) { 3490cab4cb8SJulian Andres Klode list_del_init(&msg->node); 3500cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 3510cab4cb8SJulian Andres Klode } 3520cab4cb8SJulian Andres Klode } 3530cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 35432890b98SMarc Dietrich } 35532890b98SMarc Dietrich 356bdf034d9SJulian Andres Klode /** 357bdf034d9SJulian Andres Klode * parse_msg - Print some information and call the notifiers on an RX message 358bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 359bdf034d9SJulian Andres Klode * @msg: A message received by @nvec 360bdf034d9SJulian Andres Klode * 361bdf034d9SJulian Andres Klode * Paarse some pieces of the message and then call the chain of notifiers 362bdf034d9SJulian Andres Klode * registered via nvec_register_notifier. 363bdf034d9SJulian Andres Klode */ 36432890b98SMarc Dietrich static int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) 36532890b98SMarc Dietrich { 36632890b98SMarc Dietrich if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { 367162c7d8cSMarc Dietrich dev_err(nvec->dev, "ec responded %02x %02x %02x %02x\n", 368162c7d8cSMarc Dietrich msg->data[0], msg->data[1], msg->data[2], msg->data[3]); 36932890b98SMarc Dietrich return -EINVAL; 37032890b98SMarc Dietrich } 37132890b98SMarc Dietrich 372a3a9aa1aSMarc Dietrich if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) 373a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "ec system event ", 374a3a9aa1aSMarc Dietrich DUMP_PREFIX_NONE, 16, 1, msg->data, 375a3a9aa1aSMarc Dietrich msg->data[1] + 2, true); 37632890b98SMarc Dietrich 377162c7d8cSMarc Dietrich atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, 378162c7d8cSMarc Dietrich msg->data); 37932890b98SMarc Dietrich 38032890b98SMarc Dietrich return 0; 38132890b98SMarc Dietrich } 38232890b98SMarc Dietrich 383bdf034d9SJulian Andres Klode /** 384bdf034d9SJulian Andres Klode * nvec_dispatch - Process messages received from the EC 385bdf034d9SJulian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 386bdf034d9SJulian Andres Klode * 387bdf034d9SJulian Andres Klode * Process messages previously received from the EC and put into the RX 388bdf034d9SJulian Andres Klode * queue of the &struct nvec_chip instance associated with @work. 389bdf034d9SJulian Andres Klode */ 39032890b98SMarc Dietrich static void nvec_dispatch(struct work_struct *work) 39132890b98SMarc Dietrich { 39232890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); 3930cab4cb8SJulian Andres Klode unsigned long flags; 39432890b98SMarc Dietrich struct nvec_msg *msg; 39532890b98SMarc Dietrich 3960cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 397162c7d8cSMarc Dietrich while (!list_empty(&nvec->rx_data)) { 39832890b98SMarc Dietrich msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); 39932890b98SMarc Dietrich list_del_init(&msg->node); 4000cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 40132890b98SMarc Dietrich 402162c7d8cSMarc Dietrich if (nvec->sync_write_pending == 403162c7d8cSMarc Dietrich (msg->data[2] << 8) + msg->data[0]) { 40432890b98SMarc Dietrich dev_dbg(nvec->dev, "sync write completed!\n"); 40532890b98SMarc Dietrich nvec->sync_write_pending = 0; 40632890b98SMarc Dietrich nvec->last_sync_msg = msg; 40732890b98SMarc Dietrich complete(&nvec->sync_write); 40832890b98SMarc Dietrich } else { 40932890b98SMarc Dietrich parse_msg(nvec, msg); 4100cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 41132890b98SMarc Dietrich } 4120cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 41332890b98SMarc Dietrich } 4140cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 4150cab4cb8SJulian Andres Klode } 4160cab4cb8SJulian Andres Klode 417bdf034d9SJulian Andres Klode /** 418bdf034d9SJulian Andres Klode * nvec_tx_completed - Complete the current transfer 419bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 420bdf034d9SJulian Andres Klode * 421bdf034d9SJulian Andres Klode * This is called when we have received an END_TRANS on a TX transfer. 422bdf034d9SJulian Andres Klode */ 4230cab4cb8SJulian Andres Klode static void nvec_tx_completed(struct nvec_chip *nvec) 4240cab4cb8SJulian Andres Klode { 4250cab4cb8SJulian Andres Klode /* We got an END_TRANS, let's skip this, maybe there's an event */ 4260cab4cb8SJulian Andres Klode if (nvec->tx->pos != nvec->tx->size) { 4270cab4cb8SJulian Andres Klode dev_err(nvec->dev, "premature END_TRANS, resending\n"); 4280cab4cb8SJulian Andres Klode nvec->tx->pos = 0; 4290cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 0); 4300cab4cb8SJulian Andres Klode } else { 4310cab4cb8SJulian Andres Klode nvec->state = 0; 43232890b98SMarc Dietrich } 43332890b98SMarc Dietrich } 43432890b98SMarc Dietrich 435bdf034d9SJulian Andres Klode /** 436bdf034d9SJulian Andres Klode * nvec_rx_completed - Complete the current transfer 437bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 438bdf034d9SJulian Andres Klode * 439bdf034d9SJulian Andres Klode * This is called when we have received an END_TRANS on a RX transfer. 440bdf034d9SJulian Andres Klode */ 4410cab4cb8SJulian Andres Klode static void nvec_rx_completed(struct nvec_chip *nvec) 4420cab4cb8SJulian Andres Klode { 443210ceb4fSJulian Andres Klode if (nvec->rx->pos != nvec_msg_size(nvec->rx)) { 4440cab4cb8SJulian Andres Klode dev_err(nvec->dev, "RX incomplete: Expected %u bytes, got %u\n", 4450cab4cb8SJulian Andres Klode (uint) nvec_msg_size(nvec->rx), 4460cab4cb8SJulian Andres Klode (uint) nvec->rx->pos); 4470cab4cb8SJulian Andres Klode 448210ceb4fSJulian Andres Klode nvec_msg_free(nvec, nvec->rx); 449210ceb4fSJulian Andres Klode nvec->state = 0; 450d6bdcf2eSJulian Andres Klode 451d6bdcf2eSJulian Andres Klode /* Battery quirk - Often incomplete, and likes to crash */ 452d6bdcf2eSJulian Andres Klode if (nvec->rx->data[0] == NVEC_BAT) 453d6bdcf2eSJulian Andres Klode complete(&nvec->ec_transfer); 454d6bdcf2eSJulian Andres Klode 455210ceb4fSJulian Andres Klode return; 456210ceb4fSJulian Andres Klode } 457210ceb4fSJulian Andres Klode 4580cab4cb8SJulian Andres Klode spin_lock(&nvec->rx_lock); 4590cab4cb8SJulian Andres Klode 4600cab4cb8SJulian Andres Klode /* add the received data to the work list 4610cab4cb8SJulian Andres Klode and move the ring buffer pointer to the next entry */ 4620cab4cb8SJulian Andres Klode list_add_tail(&nvec->rx->node, &nvec->rx_data); 4630cab4cb8SJulian Andres Klode 4640cab4cb8SJulian Andres Klode spin_unlock(&nvec->rx_lock); 4650cab4cb8SJulian Andres Klode 4660cab4cb8SJulian Andres Klode nvec->state = 0; 4670cab4cb8SJulian Andres Klode 4680cab4cb8SJulian Andres Klode if (!nvec_msg_is_event(nvec->rx)) 4690cab4cb8SJulian Andres Klode complete(&nvec->ec_transfer); 4700cab4cb8SJulian Andres Klode 4710cab4cb8SJulian Andres Klode queue_work(nvec->wq, &nvec->rx_work); 4720cab4cb8SJulian Andres Klode } 4730cab4cb8SJulian Andres Klode 4740cab4cb8SJulian Andres Klode /** 4750cab4cb8SJulian Andres Klode * nvec_invalid_flags - Send an error message about invalid flags and jump 4760cab4cb8SJulian Andres Klode * @nvec: The nvec device 4770cab4cb8SJulian Andres Klode * @status: The status flags 4780cab4cb8SJulian Andres Klode * @reset: Whether we shall jump to state 0. 4790cab4cb8SJulian Andres Klode */ 4800cab4cb8SJulian Andres Klode static void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status, 4810cab4cb8SJulian Andres Klode bool reset) 4820cab4cb8SJulian Andres Klode { 4830cab4cb8SJulian Andres Klode dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n", 4840cab4cb8SJulian Andres Klode status, nvec->state); 4850cab4cb8SJulian Andres Klode if (reset) 4860cab4cb8SJulian Andres Klode nvec->state = 0; 4870cab4cb8SJulian Andres Klode } 4880cab4cb8SJulian Andres Klode 4890cab4cb8SJulian Andres Klode /** 4900cab4cb8SJulian Andres Klode * nvec_tx_set - Set the message to transfer (nvec->tx) 491bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 492bdf034d9SJulian Andres Klode * 493bdf034d9SJulian Andres Klode * Gets the first entry from the tx_data list of @nvec and sets the 494bdf034d9SJulian Andres Klode * tx member to it. If the tx_data list is empty, this uses the 495bdf034d9SJulian Andres Klode * tx_scratch message to send a no operation message. 4960cab4cb8SJulian Andres Klode */ 4970cab4cb8SJulian Andres Klode static void nvec_tx_set(struct nvec_chip *nvec) 4980cab4cb8SJulian Andres Klode { 4990cab4cb8SJulian Andres Klode spin_lock(&nvec->tx_lock); 5000cab4cb8SJulian Andres Klode if (list_empty(&nvec->tx_data)) { 5010cab4cb8SJulian Andres Klode dev_err(nvec->dev, "empty tx - sending no-op\n"); 5020cab4cb8SJulian Andres Klode memcpy(nvec->tx_scratch.data, "\x02\x07\x02", 3); 5030cab4cb8SJulian Andres Klode nvec->tx_scratch.size = 3; 5040cab4cb8SJulian Andres Klode nvec->tx_scratch.pos = 0; 5050cab4cb8SJulian Andres Klode nvec->tx = &nvec->tx_scratch; 5060cab4cb8SJulian Andres Klode list_add_tail(&nvec->tx->node, &nvec->tx_data); 5070cab4cb8SJulian Andres Klode } else { 5080cab4cb8SJulian Andres Klode nvec->tx = list_first_entry(&nvec->tx_data, struct nvec_msg, 5090cab4cb8SJulian Andres Klode node); 5100cab4cb8SJulian Andres Klode nvec->tx->pos = 0; 5110cab4cb8SJulian Andres Klode } 5120cab4cb8SJulian Andres Klode spin_unlock(&nvec->tx_lock); 5130cab4cb8SJulian Andres Klode 5140cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "Sending message of length %u, command 0x%x\n", 5150cab4cb8SJulian Andres Klode (uint)nvec->tx->size, nvec->tx->data[1]); 5160cab4cb8SJulian Andres Klode } 5170cab4cb8SJulian Andres Klode 5180cab4cb8SJulian Andres Klode /** 5190cab4cb8SJulian Andres Klode * nvec_interrupt - Interrupt handler 5200cab4cb8SJulian Andres Klode * @irq: The IRQ 5210cab4cb8SJulian Andres Klode * @dev: The nvec device 522bdf034d9SJulian Andres Klode * 523bdf034d9SJulian Andres Klode * Interrupt handler that fills our RX buffers and empties our TX 524bdf034d9SJulian Andres Klode * buffers. This uses a finite state machine with ridiculous amounts 525bdf034d9SJulian Andres Klode * of error checking, in order to be fairly reliable. 5260cab4cb8SJulian Andres Klode */ 527f686e9afSMarc Dietrich static irqreturn_t nvec_interrupt(int irq, void *dev) 52832890b98SMarc Dietrich { 52932890b98SMarc Dietrich unsigned long status; 5300cab4cb8SJulian Andres Klode unsigned int received = 0; 5310cab4cb8SJulian Andres Klode unsigned char to_send = 0xff; 5320cab4cb8SJulian Andres Klode const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW; 5330cab4cb8SJulian Andres Klode struct nvec_chip *nvec = dev; 5340cab4cb8SJulian Andres Klode unsigned int state = nvec->state; 53532890b98SMarc Dietrich 5360cab4cb8SJulian Andres Klode status = readl(nvec->base + I2C_SL_STATUS); 53732890b98SMarc Dietrich 5380cab4cb8SJulian Andres Klode /* Filter out some errors */ 5390cab4cb8SJulian Andres Klode if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) { 5400cab4cb8SJulian Andres Klode dev_err(nvec->dev, "unexpected irq mask %lx\n", status); 54132890b98SMarc Dietrich return IRQ_HANDLED; 5420cab4cb8SJulian Andres Klode } 5430cab4cb8SJulian Andres Klode if ((status & I2C_SL_IRQ) == 0) { 5440cab4cb8SJulian Andres Klode dev_err(nvec->dev, "Spurious IRQ\n"); 5450cab4cb8SJulian Andres Klode return IRQ_HANDLED; 5460cab4cb8SJulian Andres Klode } 5470cab4cb8SJulian Andres Klode 5480cab4cb8SJulian Andres Klode /* The EC did not request a read, so it send us something, read it */ 5490cab4cb8SJulian Andres Klode if ((status & RNW) == 0) { 5500cab4cb8SJulian Andres Klode received = readl(nvec->base + I2C_SL_RCVD); 55132890b98SMarc Dietrich if (status & RCVD) 5520cab4cb8SJulian Andres Klode writel(0, nvec->base + I2C_SL_RCVD); 5530cab4cb8SJulian Andres Klode } 55432890b98SMarc Dietrich 5550cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RCVD)) 5560cab4cb8SJulian Andres Klode nvec->state = 0; 557162c7d8cSMarc Dietrich 5580cab4cb8SJulian Andres Klode switch (nvec->state) { 5590cab4cb8SJulian Andres Klode case 0: /* Verify that its a transfer start, the rest later */ 5600cab4cb8SJulian Andres Klode if (status != (I2C_SL_IRQ | RCVD)) 5610cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, false); 5620cab4cb8SJulian Andres Klode break; 5630cab4cb8SJulian Andres Klode case 1: /* command byte */ 5640cab4cb8SJulian Andres Klode if (status != I2C_SL_IRQ) { 5650cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 56632890b98SMarc Dietrich } else { 567bb0590e2SJulian Andres Klode nvec->rx = nvec_msg_alloc(nvec, NVEC_MSG_RX); 5688da79863SJulian Andres Klode /* Should not happen in a normal world */ 5698da79863SJulian Andres Klode if (unlikely(nvec->rx == NULL)) { 5708da79863SJulian Andres Klode nvec->state = 0; 5718da79863SJulian Andres Klode break; 5728da79863SJulian Andres Klode } 5730cab4cb8SJulian Andres Klode nvec->rx->data[0] = received; 5740cab4cb8SJulian Andres Klode nvec->rx->pos = 1; 5750cab4cb8SJulian Andres Klode nvec->state = 2; 5760cab4cb8SJulian Andres Klode } 5770cab4cb8SJulian Andres Klode break; 5780cab4cb8SJulian Andres Klode case 2: /* first byte after command */ 5790cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) { 5800cab4cb8SJulian Andres Klode udelay(33); 5810cab4cb8SJulian Andres Klode if (nvec->rx->data[0] != 0x01) { 5820cab4cb8SJulian Andres Klode dev_err(nvec->dev, 5830cab4cb8SJulian Andres Klode "Read without prior read command\n"); 5840cab4cb8SJulian Andres Klode nvec->state = 0; 5850cab4cb8SJulian Andres Klode break; 5860cab4cb8SJulian Andres Klode } 5870cab4cb8SJulian Andres Klode nvec_msg_free(nvec, nvec->rx); 5880cab4cb8SJulian Andres Klode nvec->state = 3; 5890cab4cb8SJulian Andres Klode nvec_tx_set(nvec); 5900cab4cb8SJulian Andres Klode BUG_ON(nvec->tx->size < 1); 5910cab4cb8SJulian Andres Klode to_send = nvec->tx->data[0]; 5920cab4cb8SJulian Andres Klode nvec->tx->pos = 1; 5930cab4cb8SJulian Andres Klode } else if (status == (I2C_SL_IRQ)) { 5940cab4cb8SJulian Andres Klode BUG_ON(nvec->rx == NULL); 5950cab4cb8SJulian Andres Klode nvec->rx->data[1] = received; 5960cab4cb8SJulian Andres Klode nvec->rx->pos = 2; 5970cab4cb8SJulian Andres Klode nvec->state = 4; 59832890b98SMarc Dietrich } else { 5990cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 60032890b98SMarc Dietrich } 6010cab4cb8SJulian Andres Klode break; 6020cab4cb8SJulian Andres Klode case 3: /* EC does a block read, we transmit data */ 6030cab4cb8SJulian Andres Klode if (status & END_TRANS) { 6040cab4cb8SJulian Andres Klode nvec_tx_completed(nvec); 6050cab4cb8SJulian Andres Klode } else if ((status & RNW) == 0 || (status & RCVD)) { 6060cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 6070cab4cb8SJulian Andres Klode } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) { 6080cab4cb8SJulian Andres Klode to_send = nvec->tx->data[nvec->tx->pos++]; 60932890b98SMarc Dietrich } else { 6100cab4cb8SJulian Andres Klode dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n", 6110cab4cb8SJulian Andres Klode nvec->tx, 6120cab4cb8SJulian Andres Klode (uint) (nvec->tx ? nvec->tx->pos : 0), 6130cab4cb8SJulian Andres Klode (uint) (nvec->tx ? nvec->tx->size : 0)); 6140cab4cb8SJulian Andres Klode nvec->state = 0; 6150cab4cb8SJulian Andres Klode } 6160cab4cb8SJulian Andres Klode break; 6170cab4cb8SJulian Andres Klode case 4: /* EC does some write, we read the data */ 6180cab4cb8SJulian Andres Klode if ((status & (END_TRANS | RNW)) == END_TRANS) 6190cab4cb8SJulian Andres Klode nvec_rx_completed(nvec); 6200cab4cb8SJulian Andres Klode else if (status & (RNW | RCVD)) 6210cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 6220cab4cb8SJulian Andres Klode else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE) 6230cab4cb8SJulian Andres Klode nvec->rx->data[nvec->rx->pos++] = received; 6240cab4cb8SJulian Andres Klode else 6250cab4cb8SJulian Andres Klode dev_err(nvec->dev, 6260cab4cb8SJulian Andres Klode "RX buffer overflow on %p: " 6270cab4cb8SJulian Andres Klode "Trying to write byte %u of %u\n", 6280cab4cb8SJulian Andres Klode nvec->rx, nvec->rx->pos, NVEC_MSG_SIZE); 6290cab4cb8SJulian Andres Klode break; 6300cab4cb8SJulian Andres Klode default: 6310cab4cb8SJulian Andres Klode nvec->state = 0; 63232890b98SMarc Dietrich } 63332890b98SMarc Dietrich 6340cab4cb8SJulian Andres Klode /* If we are told that a new transfer starts, verify it */ 6350cab4cb8SJulian Andres Klode if ((status & (RCVD | RNW)) == RCVD) { 6360cab4cb8SJulian Andres Klode if (received != nvec->i2c_addr) 6370cab4cb8SJulian Andres Klode dev_err(nvec->dev, 6380cab4cb8SJulian Andres Klode "received address 0x%02x, expected 0x%02x\n", 6390cab4cb8SJulian Andres Klode received, nvec->i2c_addr); 6400cab4cb8SJulian Andres Klode nvec->state = 1; 64132890b98SMarc Dietrich } 6420cab4cb8SJulian Andres Klode 6430cab4cb8SJulian Andres Klode /* Send data if requested, but not on end of transmission */ 6440cab4cb8SJulian Andres Klode if ((status & (RNW | END_TRANS)) == RNW) 6450cab4cb8SJulian Andres Klode writel(to_send, nvec->base + I2C_SL_RCVD); 6460cab4cb8SJulian Andres Klode 6470cab4cb8SJulian Andres Klode /* If we have send the first byte */ 6480cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) 6490cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 1); 6500cab4cb8SJulian Andres Klode 6510cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, 6520cab4cb8SJulian Andres Klode "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n", 6530cab4cb8SJulian Andres Klode (status & RNW) == 0 ? "received" : "R=", 6540cab4cb8SJulian Andres Klode received, 6550cab4cb8SJulian Andres Klode (status & (RNW | END_TRANS)) ? "sent" : "S=", 6560cab4cb8SJulian Andres Klode to_send, 6570cab4cb8SJulian Andres Klode state, 6580cab4cb8SJulian Andres Klode status & END_TRANS ? " END_TRANS" : "", 6590cab4cb8SJulian Andres Klode status & RCVD ? " RCVD" : "", 6600cab4cb8SJulian Andres Klode status & RNW ? " RNW" : ""); 6610cab4cb8SJulian Andres Klode 662de839b8fSJulian Andres Klode 663de839b8fSJulian Andres Klode /* 664de839b8fSJulian Andres Klode * TODO: A correct fix needs to be found for this. 665de839b8fSJulian Andres Klode * 666de839b8fSJulian Andres Klode * We experience less incomplete messages with this delay than without 667de839b8fSJulian Andres Klode * it, but we don't know why. Help is appreciated. 668de839b8fSJulian Andres Klode */ 669de839b8fSJulian Andres Klode udelay(100); 670de839b8fSJulian Andres Klode 67132890b98SMarc Dietrich return IRQ_HANDLED; 67232890b98SMarc Dietrich } 67332890b98SMarc Dietrich 674f686e9afSMarc Dietrich static void tegra_init_i2c_slave(struct nvec_chip *nvec) 67532890b98SMarc Dietrich { 67632890b98SMarc Dietrich u32 val; 67732890b98SMarc Dietrich 678f686e9afSMarc Dietrich clk_enable(nvec->i2c_clk); 679f686e9afSMarc Dietrich 680f686e9afSMarc Dietrich tegra_periph_reset_assert(nvec->i2c_clk); 68132890b98SMarc Dietrich udelay(2); 682f686e9afSMarc Dietrich tegra_periph_reset_deassert(nvec->i2c_clk); 68332890b98SMarc Dietrich 68432890b98SMarc Dietrich val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | 68532890b98SMarc Dietrich (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); 686f686e9afSMarc Dietrich writel(val, nvec->base + I2C_CNFG); 68732890b98SMarc Dietrich 688ac810759SMarc Dietrich clk_set_rate(nvec->i2c_clk, 8 * 80000); 689ac810759SMarc Dietrich 690ac810759SMarc Dietrich writel(I2C_SL_NEWL, nvec->base + I2C_SL_CNFG); 691ac810759SMarc Dietrich writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); 692ac810759SMarc Dietrich 693ac810759SMarc Dietrich writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); 694ac810759SMarc Dietrich writel(0, nvec->base + I2C_SL_ADDR2); 695ac810759SMarc Dietrich 696ac810759SMarc Dietrich enable_irq(nvec->irq); 697ac810759SMarc Dietrich 698ac810759SMarc Dietrich clk_disable(nvec->i2c_clk); 699ac810759SMarc Dietrich } 700ac810759SMarc Dietrich 701ac810759SMarc Dietrich static void nvec_disable_i2c_slave(struct nvec_chip *nvec) 702ac810759SMarc Dietrich { 703ac810759SMarc Dietrich disable_irq(nvec->irq); 704ac810759SMarc Dietrich writel(I2C_SL_NEWL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); 705f686e9afSMarc Dietrich clk_disable(nvec->i2c_clk); 70632890b98SMarc Dietrich } 70732890b98SMarc Dietrich 70832890b98SMarc Dietrich static void nvec_power_off(void) 70932890b98SMarc Dietrich { 71032890b98SMarc Dietrich nvec_write_async(nvec_power_handle, EC_DISABLE_EVENT_REPORTING, 3); 71132890b98SMarc Dietrich nvec_write_async(nvec_power_handle, "\x04\x01", 2); 71232890b98SMarc Dietrich } 71332890b98SMarc Dietrich 71432890b98SMarc Dietrich static int __devinit tegra_nvec_probe(struct platform_device *pdev) 71532890b98SMarc Dietrich { 716f686e9afSMarc Dietrich int err, ret; 71732890b98SMarc Dietrich struct clk *i2c_clk; 71832890b98SMarc Dietrich struct nvec_platform_data *pdata = pdev->dev.platform_data; 71932890b98SMarc Dietrich struct nvec_chip *nvec; 72032890b98SMarc Dietrich struct nvec_msg *msg; 721f686e9afSMarc Dietrich struct resource *res; 722f686e9afSMarc Dietrich struct resource *iomem; 723f686e9afSMarc Dietrich void __iomem *base; 72432890b98SMarc Dietrich 72532890b98SMarc Dietrich nvec = kzalloc(sizeof(struct nvec_chip), GFP_KERNEL); 72632890b98SMarc Dietrich if (nvec == NULL) { 72732890b98SMarc Dietrich dev_err(&pdev->dev, "failed to reserve memory\n"); 72832890b98SMarc Dietrich return -ENOMEM; 72932890b98SMarc Dietrich } 73032890b98SMarc Dietrich platform_set_drvdata(pdev, nvec); 73132890b98SMarc Dietrich nvec->dev = &pdev->dev; 7327990b0d7SMarc Dietrich 7337990b0d7SMarc Dietrich if (pdata) { 73432890b98SMarc Dietrich nvec->gpio = pdata->gpio; 735f686e9afSMarc Dietrich nvec->i2c_addr = pdata->i2c_addr; 7367990b0d7SMarc Dietrich } else if (nvec->dev->of_node) { 7377990b0d7SMarc Dietrich nvec->gpio = of_get_named_gpio(nvec->dev->of_node, "request-gpios", 0); 7387990b0d7SMarc Dietrich if (nvec->gpio < 0) { 7397990b0d7SMarc Dietrich dev_err(&pdev->dev, "no gpio specified"); 7407990b0d7SMarc Dietrich goto failed; 7417990b0d7SMarc Dietrich } 7427990b0d7SMarc Dietrich if (of_property_read_u32(nvec->dev->of_node, "slave-addr", &nvec->i2c_addr)) { 7437990b0d7SMarc Dietrich dev_err(&pdev->dev, "no i2c address specified"); 7447990b0d7SMarc Dietrich goto failed; 7457990b0d7SMarc Dietrich } 7467990b0d7SMarc Dietrich } else { 7477990b0d7SMarc Dietrich dev_err(&pdev->dev, "no platform data\n"); 7487990b0d7SMarc Dietrich goto failed; 7497990b0d7SMarc Dietrich } 75032890b98SMarc Dietrich 751f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 752f686e9afSMarc Dietrich if (!res) { 753f686e9afSMarc Dietrich dev_err(&pdev->dev, "no mem resource?\n"); 754f686e9afSMarc Dietrich return -ENODEV; 75532890b98SMarc Dietrich } 75632890b98SMarc Dietrich 757f686e9afSMarc Dietrich iomem = request_mem_region(res->start, resource_size(res), pdev->name); 758f686e9afSMarc Dietrich if (!iomem) { 759f686e9afSMarc Dietrich dev_err(&pdev->dev, "I2C region already claimed\n"); 760f686e9afSMarc Dietrich return -EBUSY; 76132890b98SMarc Dietrich } 76232890b98SMarc Dietrich 763f686e9afSMarc Dietrich base = ioremap(iomem->start, resource_size(iomem)); 764f686e9afSMarc Dietrich if (!base) { 765f686e9afSMarc Dietrich dev_err(&pdev->dev, "Can't ioremap I2C region\n"); 766f686e9afSMarc Dietrich return -ENOMEM; 767f686e9afSMarc Dietrich } 76832890b98SMarc Dietrich 769f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 770f686e9afSMarc Dietrich if (!res) { 771f686e9afSMarc Dietrich dev_err(&pdev->dev, "no irq resource?\n"); 772f686e9afSMarc Dietrich ret = -ENODEV; 773f686e9afSMarc Dietrich goto err_iounmap; 774f686e9afSMarc Dietrich } 775f686e9afSMarc Dietrich 776f686e9afSMarc Dietrich i2c_clk = clk_get_sys("tegra-i2c.2", NULL); 777f686e9afSMarc Dietrich if (IS_ERR(i2c_clk)) { 778f686e9afSMarc Dietrich dev_err(nvec->dev, "failed to get controller clock\n"); 779f686e9afSMarc Dietrich goto err_iounmap; 78032890b98SMarc Dietrich } 78132890b98SMarc Dietrich 782f686e9afSMarc Dietrich nvec->base = base; 783f686e9afSMarc Dietrich nvec->irq = res->start; 784f686e9afSMarc Dietrich nvec->i2c_clk = i2c_clk; 7850cab4cb8SJulian Andres Klode nvec->rx = &nvec->msg_pool[0]; 786f686e9afSMarc Dietrich 78732890b98SMarc Dietrich /* Set the gpio to low when we've got something to say */ 78832890b98SMarc Dietrich err = gpio_request(nvec->gpio, "nvec gpio"); 78932890b98SMarc Dietrich if (err < 0) 79032890b98SMarc Dietrich dev_err(nvec->dev, "couldn't request gpio\n"); 79132890b98SMarc Dietrich 79232890b98SMarc Dietrich ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); 79332890b98SMarc Dietrich 79432890b98SMarc Dietrich init_completion(&nvec->sync_write); 7950cab4cb8SJulian Andres Klode init_completion(&nvec->ec_transfer); 7960cab4cb8SJulian Andres Klode mutex_init(&nvec->sync_write_mutex); 7970cab4cb8SJulian Andres Klode spin_lock_init(&nvec->tx_lock); 7980cab4cb8SJulian Andres Klode spin_lock_init(&nvec->rx_lock); 79932890b98SMarc Dietrich INIT_LIST_HEAD(&nvec->rx_data); 8000cab4cb8SJulian Andres Klode INIT_LIST_HEAD(&nvec->tx_data); 80132890b98SMarc Dietrich INIT_WORK(&nvec->rx_work, nvec_dispatch); 80232890b98SMarc Dietrich INIT_WORK(&nvec->tx_work, nvec_request_master); 8030cab4cb8SJulian Andres Klode nvec->wq = alloc_workqueue("nvec", WQ_NON_REENTRANT, 2); 80432890b98SMarc Dietrich 805f686e9afSMarc Dietrich err = request_irq(nvec->irq, nvec_interrupt, 0, "nvec", nvec); 806f686e9afSMarc Dietrich if (err) { 807f686e9afSMarc Dietrich dev_err(nvec->dev, "couldn't request irq\n"); 808f686e9afSMarc Dietrich goto failed; 809f686e9afSMarc Dietrich } 810ac810759SMarc Dietrich disable_irq(nvec->irq); 811f686e9afSMarc Dietrich 812f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 813f686e9afSMarc Dietrich 814ac810759SMarc Dietrich clk_enable(i2c_clk); 815ac810759SMarc Dietrich 816f686e9afSMarc Dietrich gpio_direction_output(nvec->gpio, 1); 817f686e9afSMarc Dietrich gpio_set_value(nvec->gpio, 1); 818f686e9afSMarc Dietrich 81932890b98SMarc Dietrich /* enable event reporting */ 82032890b98SMarc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 82132890b98SMarc Dietrich sizeof(EC_ENABLE_EVENT_REPORTING)); 82232890b98SMarc Dietrich 82332890b98SMarc Dietrich nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; 82432890b98SMarc Dietrich nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); 82532890b98SMarc Dietrich 82632890b98SMarc Dietrich nvec_power_handle = nvec; 82732890b98SMarc Dietrich pm_power_off = nvec_power_off; 82832890b98SMarc Dietrich 82932890b98SMarc Dietrich /* Get Firmware Version */ 83032890b98SMarc Dietrich msg = nvec_write_sync(nvec, EC_GET_FIRMWARE_VERSION, 83132890b98SMarc Dietrich sizeof(EC_GET_FIRMWARE_VERSION)); 83232890b98SMarc Dietrich 8330cab4cb8SJulian Andres Klode if (msg) { 83432890b98SMarc Dietrich dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", 83532890b98SMarc Dietrich msg->data[4], msg->data[5], msg->data[6], msg->data[7]); 83632890b98SMarc Dietrich 8370cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 8380cab4cb8SJulian Andres Klode } 83932890b98SMarc Dietrich 840f686e9afSMarc Dietrich ret = mfd_add_devices(nvec->dev, -1, nvec_devices, 841f686e9afSMarc Dietrich ARRAY_SIZE(nvec_devices), base, 0); 842f686e9afSMarc Dietrich if (ret) 843f686e9afSMarc Dietrich dev_err(nvec->dev, "error adding subdevices\n"); 844f686e9afSMarc Dietrich 84532890b98SMarc Dietrich /* unmute speakers? */ 8466dca320cSMarc Dietrich nvec_write_async(nvec, "\x0d\x10\x59\x95", 4); 84732890b98SMarc Dietrich 84832890b98SMarc Dietrich /* enable lid switch event */ 84932890b98SMarc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x02\x00", 7); 85032890b98SMarc Dietrich 85132890b98SMarc Dietrich /* enable power button event */ 85232890b98SMarc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x80\x00", 7); 85332890b98SMarc Dietrich 85432890b98SMarc Dietrich return 0; 85532890b98SMarc Dietrich 856f686e9afSMarc Dietrich err_iounmap: 857f686e9afSMarc Dietrich iounmap(base); 85832890b98SMarc Dietrich failed: 85932890b98SMarc Dietrich kfree(nvec); 86032890b98SMarc Dietrich return -ENOMEM; 86132890b98SMarc Dietrich } 86232890b98SMarc Dietrich 86332890b98SMarc Dietrich static int __devexit tegra_nvec_remove(struct platform_device *pdev) 86432890b98SMarc Dietrich { 865f686e9afSMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 866f686e9afSMarc Dietrich 867f686e9afSMarc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 868f686e9afSMarc Dietrich mfd_remove_devices(nvec->dev); 869f686e9afSMarc Dietrich free_irq(nvec->irq, &nvec_interrupt); 870f686e9afSMarc Dietrich iounmap(nvec->base); 871f686e9afSMarc Dietrich gpio_free(nvec->gpio); 8720cab4cb8SJulian Andres Klode destroy_workqueue(nvec->wq); 873f686e9afSMarc Dietrich kfree(nvec); 874f686e9afSMarc Dietrich 87532890b98SMarc Dietrich return 0; 87632890b98SMarc Dietrich } 87732890b98SMarc Dietrich 87832890b98SMarc Dietrich #ifdef CONFIG_PM 87932890b98SMarc Dietrich 88032890b98SMarc Dietrich static int tegra_nvec_suspend(struct platform_device *pdev, pm_message_t state) 88132890b98SMarc Dietrich { 88232890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 8839feeb014SMarc Dietrich struct nvec_msg *msg; 88432890b98SMarc Dietrich 88532890b98SMarc Dietrich dev_dbg(nvec->dev, "suspending\n"); 8869feeb014SMarc Dietrich 8879feeb014SMarc Dietrich /* keep these sync or you'll break suspend */ 8889feeb014SMarc Dietrich msg = nvec_write_sync(nvec, EC_DISABLE_EVENT_REPORTING, 3); 8899feeb014SMarc Dietrich nvec_msg_free(nvec, msg); 8909feeb014SMarc Dietrich msg = nvec_write_sync(nvec, "\x04\x02", 2); 8919feeb014SMarc Dietrich nvec_msg_free(nvec, msg); 8929feeb014SMarc Dietrich 893ac810759SMarc Dietrich nvec_disable_i2c_slave(nvec); 89432890b98SMarc Dietrich 89532890b98SMarc Dietrich return 0; 89632890b98SMarc Dietrich } 89732890b98SMarc Dietrich 898162c7d8cSMarc Dietrich static int tegra_nvec_resume(struct platform_device *pdev) 899162c7d8cSMarc Dietrich { 90032890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 90132890b98SMarc Dietrich 90232890b98SMarc Dietrich dev_dbg(nvec->dev, "resuming\n"); 903f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 90432890b98SMarc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 3); 90532890b98SMarc Dietrich 90632890b98SMarc Dietrich return 0; 90732890b98SMarc Dietrich } 90832890b98SMarc Dietrich 90932890b98SMarc Dietrich #else 91032890b98SMarc Dietrich #define tegra_nvec_suspend NULL 91132890b98SMarc Dietrich #define tegra_nvec_resume NULL 91232890b98SMarc Dietrich #endif 91332890b98SMarc Dietrich 9147990b0d7SMarc Dietrich /* Match table for of_platform binding */ 9157990b0d7SMarc Dietrich static const struct of_device_id nvidia_nvec_of_match[] __devinitconst = { 9167990b0d7SMarc Dietrich { .compatible = "nvidia,nvec", }, 9177990b0d7SMarc Dietrich {}, 9187990b0d7SMarc Dietrich }; 9197990b0d7SMarc Dietrich MODULE_DEVICE_TABLE(of, nvidia_nvec_of_match); 9207990b0d7SMarc Dietrich 921162c7d8cSMarc Dietrich static struct platform_driver nvec_device_driver = { 92232890b98SMarc Dietrich .probe = tegra_nvec_probe, 92332890b98SMarc Dietrich .remove = __devexit_p(tegra_nvec_remove), 92432890b98SMarc Dietrich .suspend = tegra_nvec_suspend, 92532890b98SMarc Dietrich .resume = tegra_nvec_resume, 92632890b98SMarc Dietrich .driver = { 92732890b98SMarc Dietrich .name = "nvec", 92832890b98SMarc Dietrich .owner = THIS_MODULE, 9297990b0d7SMarc Dietrich .of_match_table = nvidia_nvec_of_match, 93032890b98SMarc Dietrich } 93132890b98SMarc Dietrich }; 93232890b98SMarc Dietrich 93332890b98SMarc Dietrich static int __init tegra_nvec_init(void) 93432890b98SMarc Dietrich { 93532890b98SMarc Dietrich return platform_driver_register(&nvec_device_driver); 93632890b98SMarc Dietrich } 93732890b98SMarc Dietrich 93832890b98SMarc Dietrich module_init(tegra_nvec_init); 939162c7d8cSMarc Dietrich 94032890b98SMarc Dietrich MODULE_ALIAS("platform:nvec"); 941162c7d8cSMarc Dietrich MODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); 942162c7d8cSMarc Dietrich MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); 943162c7d8cSMarc Dietrich MODULE_LICENSE("GPL"); 944