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> 4061fd290dSPrashant Gaikwad #include <linux/clk/tegra.h> 41162c7d8cSMarc Dietrich 4232890b98SMarc Dietrich #include "nvec.h" 4332890b98SMarc Dietrich 44391d2fa9SJulian Andres Klode #define I2C_CNFG 0x00 45391d2fa9SJulian Andres Klode #define I2C_CNFG_PACKET_MODE_EN (1<<10) 46391d2fa9SJulian Andres Klode #define I2C_CNFG_NEW_MASTER_SFM (1<<11) 47391d2fa9SJulian Andres Klode #define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12 48391d2fa9SJulian Andres Klode 49391d2fa9SJulian Andres Klode #define I2C_SL_CNFG 0x20 50d3f862aeSJulian Andres Klode #define I2C_SL_NEWSL (1<<2) 51391d2fa9SJulian Andres Klode #define I2C_SL_NACK (1<<1) 52391d2fa9SJulian Andres Klode #define I2C_SL_RESP (1<<0) 53391d2fa9SJulian Andres Klode #define I2C_SL_IRQ (1<<3) 54391d2fa9SJulian Andres Klode #define END_TRANS (1<<4) 55391d2fa9SJulian Andres Klode #define RCVD (1<<2) 56391d2fa9SJulian Andres Klode #define RNW (1<<1) 57391d2fa9SJulian Andres Klode 58391d2fa9SJulian Andres Klode #define I2C_SL_RCVD 0x24 59391d2fa9SJulian Andres Klode #define I2C_SL_STATUS 0x28 60391d2fa9SJulian Andres Klode #define I2C_SL_ADDR1 0x2c 61391d2fa9SJulian Andres Klode #define I2C_SL_ADDR2 0x30 62391d2fa9SJulian Andres Klode #define I2C_SL_DELAY_COUNT 0x3c 63391d2fa9SJulian Andres Klode 64bb0590e2SJulian Andres Klode /** 65bb0590e2SJulian Andres Klode * enum nvec_msg_category - Message categories for nvec_msg_alloc() 66bb0590e2SJulian Andres Klode * @NVEC_MSG_RX: The message is an incoming message (from EC) 67bb0590e2SJulian Andres Klode * @NVEC_MSG_TX: The message is an outgoing message (to EC) 68bb0590e2SJulian Andres Klode */ 69bb0590e2SJulian Andres Klode enum nvec_msg_category { 70bb0590e2SJulian Andres Klode NVEC_MSG_RX, 71bb0590e2SJulian Andres Klode NVEC_MSG_TX, 72bb0590e2SJulian Andres Klode }; 73bb0590e2SJulian Andres Klode 74162c7d8cSMarc Dietrich static const unsigned char EC_DISABLE_EVENT_REPORTING[3] = "\x04\x00\x00"; 75162c7d8cSMarc Dietrich static const unsigned char EC_ENABLE_EVENT_REPORTING[3] = "\x04\x00\x01"; 76162c7d8cSMarc Dietrich static const unsigned char EC_GET_FIRMWARE_VERSION[2] = "\x07\x15"; 7732890b98SMarc Dietrich 7832890b98SMarc Dietrich static struct nvec_chip *nvec_power_handle; 7932890b98SMarc Dietrich 80f686e9afSMarc Dietrich static struct mfd_cell nvec_devices[] = { 81f686e9afSMarc Dietrich { 82f686e9afSMarc Dietrich .name = "nvec-kbd", 83f686e9afSMarc Dietrich .id = 1, 84f686e9afSMarc Dietrich }, 85f686e9afSMarc Dietrich { 86f686e9afSMarc Dietrich .name = "nvec-mouse", 87f686e9afSMarc Dietrich .id = 1, 88f686e9afSMarc Dietrich }, 89f686e9afSMarc Dietrich { 90f686e9afSMarc Dietrich .name = "nvec-power", 91f686e9afSMarc Dietrich .id = 1, 92f686e9afSMarc Dietrich }, 93f686e9afSMarc Dietrich { 94f686e9afSMarc Dietrich .name = "nvec-power", 95f686e9afSMarc Dietrich .id = 2, 96f686e9afSMarc Dietrich }, 9797cc2657SIlya Petrov { 98ac562680SMarc Dietrich .name = "nvec-paz00", 9997cc2657SIlya Petrov .id = 1, 10097cc2657SIlya Petrov }, 101f686e9afSMarc Dietrich }; 102f686e9afSMarc Dietrich 103bdf034d9SJulian Andres Klode /** 104bdf034d9SJulian Andres Klode * nvec_register_notifier - Register a notifier with nvec 105bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 106bdf034d9SJulian Andres Klode * @nb: The notifier block to register 107bdf034d9SJulian Andres Klode * 108bdf034d9SJulian Andres Klode * Registers a notifier with @nvec. The notifier will be added to an atomic 109bdf034d9SJulian Andres Klode * notifier chain that is called for all received messages except those that 110bdf034d9SJulian Andres Klode * correspond to a request initiated by nvec_write_sync(). 111bdf034d9SJulian Andres Klode */ 11232890b98SMarc Dietrich int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, 11332890b98SMarc Dietrich unsigned int events) 11432890b98SMarc Dietrich { 11532890b98SMarc Dietrich return atomic_notifier_chain_register(&nvec->notifier_list, nb); 11632890b98SMarc Dietrich } 11732890b98SMarc Dietrich EXPORT_SYMBOL_GPL(nvec_register_notifier); 11832890b98SMarc Dietrich 119bdf034d9SJulian Andres Klode /** 120bdf034d9SJulian Andres Klode * nvec_status_notifier - The final notifier 121bdf034d9SJulian Andres Klode * 122bdf034d9SJulian Andres Klode * Prints a message about control events not handled in the notifier 123bdf034d9SJulian Andres Klode * chain. 124bdf034d9SJulian Andres Klode */ 125162c7d8cSMarc Dietrich static int nvec_status_notifier(struct notifier_block *nb, 126162c7d8cSMarc Dietrich unsigned long event_type, void *data) 12732890b98SMarc Dietrich { 12850d4656aSMarc Dietrich struct nvec_chip *nvec = container_of(nb, struct nvec_chip, 12950d4656aSMarc Dietrich nvec_status_notifier); 13032890b98SMarc Dietrich unsigned char *msg = (unsigned char *)data; 13132890b98SMarc Dietrich 13232890b98SMarc Dietrich if (event_type != NVEC_CNTL) 13332890b98SMarc Dietrich return NOTIFY_DONE; 13432890b98SMarc Dietrich 13550d4656aSMarc Dietrich dev_warn(nvec->dev, "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 265033d9959SLinus Torvalds schedule_work(&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 2954b8bf03dSMarc Dietrich if (nvec_write_async(nvec, data, size) < 0) { 2964b8bf03dSMarc Dietrich mutex_unlock(&nvec->sync_write_mutex); 2971b9bf629SJulian Andres Klode return NULL; 2984b8bf03dSMarc Dietrich } 2990cab4cb8SJulian Andres Klode 3000cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", 3010cab4cb8SJulian Andres Klode nvec->sync_write_pending); 3020cab4cb8SJulian Andres Klode if (!(wait_for_completion_timeout(&nvec->sync_write, 3030cab4cb8SJulian Andres Klode msecs_to_jiffies(2000)))) { 3040cab4cb8SJulian Andres Klode dev_warn(nvec->dev, "timeout waiting for sync write to complete\n"); 3050cab4cb8SJulian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3060cab4cb8SJulian Andres Klode return NULL; 3070cab4cb8SJulian Andres Klode } 3080cab4cb8SJulian Andres Klode 3090cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); 3100cab4cb8SJulian Andres Klode 3110cab4cb8SJulian Andres Klode msg = nvec->last_sync_msg; 3120cab4cb8SJulian Andres Klode 3130cab4cb8SJulian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3140cab4cb8SJulian Andres Klode 3150cab4cb8SJulian Andres Klode return msg; 3160cab4cb8SJulian Andres Klode } 3170cab4cb8SJulian Andres Klode EXPORT_SYMBOL(nvec_write_sync); 3180cab4cb8SJulian Andres Klode 319bdf034d9SJulian Andres Klode /** 320bdf034d9SJulian Andres Klode * nvec_request_master - Process outgoing messages 321bdf034d9SJulian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 322bdf034d9SJulian Andres Klode * 323bdf034d9SJulian Andres Klode * Processes all outgoing requests by sending the request and awaiting the 324bdf034d9SJulian Andres Klode * response, then continuing with the next request. Once a request has a 325bdf034d9SJulian Andres Klode * matching response, it will be freed and removed from the list. 326bdf034d9SJulian Andres Klode */ 32732890b98SMarc Dietrich static void nvec_request_master(struct work_struct *work) 32832890b98SMarc Dietrich { 32932890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); 3300cab4cb8SJulian Andres Klode unsigned long flags; 3310cab4cb8SJulian Andres Klode long err; 3320cab4cb8SJulian Andres Klode struct nvec_msg *msg; 33332890b98SMarc Dietrich 3340cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3350cab4cb8SJulian Andres Klode while (!list_empty(&nvec->tx_data)) { 3360cab4cb8SJulian Andres Klode msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); 3370cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 3380cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 0); 3390cab4cb8SJulian Andres Klode err = wait_for_completion_interruptible_timeout( 3400cab4cb8SJulian Andres Klode &nvec->ec_transfer, msecs_to_jiffies(5000)); 3410cab4cb8SJulian Andres Klode 3420cab4cb8SJulian Andres Klode if (err == 0) { 3430cab4cb8SJulian Andres Klode dev_warn(nvec->dev, "timeout waiting for ec transfer\n"); 3440cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 1); 3450cab4cb8SJulian Andres Klode msg->pos = 0; 3460cab4cb8SJulian Andres Klode } 3470cab4cb8SJulian Andres Klode 3480cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3490cab4cb8SJulian Andres Klode 3500cab4cb8SJulian Andres Klode if (err > 0) { 3510cab4cb8SJulian Andres Klode list_del_init(&msg->node); 3520cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 3530cab4cb8SJulian Andres Klode } 3540cab4cb8SJulian Andres Klode } 3550cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 35632890b98SMarc Dietrich } 35732890b98SMarc Dietrich 358bdf034d9SJulian Andres Klode /** 359bdf034d9SJulian Andres Klode * parse_msg - Print some information and call the notifiers on an RX message 360bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 361bdf034d9SJulian Andres Klode * @msg: A message received by @nvec 362bdf034d9SJulian Andres Klode * 363bdf034d9SJulian Andres Klode * Paarse some pieces of the message and then call the chain of notifiers 364bdf034d9SJulian Andres Klode * registered via nvec_register_notifier. 365bdf034d9SJulian Andres Klode */ 36632890b98SMarc Dietrich static int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) 36732890b98SMarc Dietrich { 36832890b98SMarc Dietrich if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { 3696a371978SAndy Shevchenko dev_err(nvec->dev, "ec responded %*ph\n", 4, msg->data); 37032890b98SMarc Dietrich return -EINVAL; 37132890b98SMarc Dietrich } 37232890b98SMarc Dietrich 373a3a9aa1aSMarc Dietrich if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) 374a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "ec system event ", 375a3a9aa1aSMarc Dietrich DUMP_PREFIX_NONE, 16, 1, msg->data, 376a3a9aa1aSMarc Dietrich msg->data[1] + 2, true); 37732890b98SMarc Dietrich 378162c7d8cSMarc Dietrich atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, 379162c7d8cSMarc Dietrich msg->data); 38032890b98SMarc Dietrich 38132890b98SMarc Dietrich return 0; 38232890b98SMarc Dietrich } 38332890b98SMarc Dietrich 384bdf034d9SJulian Andres Klode /** 385bdf034d9SJulian Andres Klode * nvec_dispatch - Process messages received from the EC 386bdf034d9SJulian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 387bdf034d9SJulian Andres Klode * 388bdf034d9SJulian Andres Klode * Process messages previously received from the EC and put into the RX 389bdf034d9SJulian Andres Klode * queue of the &struct nvec_chip instance associated with @work. 390bdf034d9SJulian Andres Klode */ 39132890b98SMarc Dietrich static void nvec_dispatch(struct work_struct *work) 39232890b98SMarc Dietrich { 39332890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); 3940cab4cb8SJulian Andres Klode unsigned long flags; 39532890b98SMarc Dietrich struct nvec_msg *msg; 39632890b98SMarc Dietrich 3970cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 398162c7d8cSMarc Dietrich while (!list_empty(&nvec->rx_data)) { 39932890b98SMarc Dietrich msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); 40032890b98SMarc Dietrich list_del_init(&msg->node); 4010cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 40232890b98SMarc Dietrich 403162c7d8cSMarc Dietrich if (nvec->sync_write_pending == 404162c7d8cSMarc Dietrich (msg->data[2] << 8) + msg->data[0]) { 40532890b98SMarc Dietrich dev_dbg(nvec->dev, "sync write completed!\n"); 40632890b98SMarc Dietrich nvec->sync_write_pending = 0; 40732890b98SMarc Dietrich nvec->last_sync_msg = msg; 40832890b98SMarc Dietrich complete(&nvec->sync_write); 40932890b98SMarc Dietrich } else { 41032890b98SMarc Dietrich parse_msg(nvec, msg); 4110cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 41232890b98SMarc Dietrich } 4130cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 41432890b98SMarc Dietrich } 4150cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 4160cab4cb8SJulian Andres Klode } 4170cab4cb8SJulian Andres Klode 418bdf034d9SJulian Andres Klode /** 419bdf034d9SJulian Andres Klode * nvec_tx_completed - Complete the current transfer 420bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 421bdf034d9SJulian Andres Klode * 422bdf034d9SJulian Andres Klode * This is called when we have received an END_TRANS on a TX transfer. 423bdf034d9SJulian Andres Klode */ 4240cab4cb8SJulian Andres Klode static void nvec_tx_completed(struct nvec_chip *nvec) 4250cab4cb8SJulian Andres Klode { 4260cab4cb8SJulian Andres Klode /* We got an END_TRANS, let's skip this, maybe there's an event */ 4270cab4cb8SJulian Andres Klode if (nvec->tx->pos != nvec->tx->size) { 4280cab4cb8SJulian Andres Klode dev_err(nvec->dev, "premature END_TRANS, resending\n"); 4290cab4cb8SJulian Andres Klode nvec->tx->pos = 0; 4300cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 0); 4310cab4cb8SJulian Andres Klode } else { 4320cab4cb8SJulian Andres Klode nvec->state = 0; 43332890b98SMarc Dietrich } 43432890b98SMarc Dietrich } 43532890b98SMarc Dietrich 436bdf034d9SJulian Andres Klode /** 437bdf034d9SJulian Andres Klode * nvec_rx_completed - Complete the current transfer 438bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 439bdf034d9SJulian Andres Klode * 440bdf034d9SJulian Andres Klode * This is called when we have received an END_TRANS on a RX transfer. 441bdf034d9SJulian Andres Klode */ 4420cab4cb8SJulian Andres Klode static void nvec_rx_completed(struct nvec_chip *nvec) 4430cab4cb8SJulian Andres Klode { 444210ceb4fSJulian Andres Klode if (nvec->rx->pos != nvec_msg_size(nvec->rx)) { 4450cab4cb8SJulian Andres Klode dev_err(nvec->dev, "RX incomplete: Expected %u bytes, got %u\n", 4460cab4cb8SJulian Andres Klode (uint) nvec_msg_size(nvec->rx), 4470cab4cb8SJulian Andres Klode (uint) nvec->rx->pos); 4480cab4cb8SJulian Andres Klode 449210ceb4fSJulian Andres Klode nvec_msg_free(nvec, nvec->rx); 450210ceb4fSJulian Andres Klode nvec->state = 0; 451d6bdcf2eSJulian Andres Klode 452d6bdcf2eSJulian Andres Klode /* Battery quirk - Often incomplete, and likes to crash */ 453d6bdcf2eSJulian Andres Klode if (nvec->rx->data[0] == NVEC_BAT) 454d6bdcf2eSJulian Andres Klode complete(&nvec->ec_transfer); 455d6bdcf2eSJulian Andres Klode 456210ceb4fSJulian Andres Klode return; 457210ceb4fSJulian Andres Klode } 458210ceb4fSJulian Andres Klode 4590cab4cb8SJulian Andres Klode spin_lock(&nvec->rx_lock); 4600cab4cb8SJulian Andres Klode 4610cab4cb8SJulian Andres Klode /* add the received data to the work list 4620cab4cb8SJulian Andres Klode and move the ring buffer pointer to the next entry */ 4630cab4cb8SJulian Andres Klode list_add_tail(&nvec->rx->node, &nvec->rx_data); 4640cab4cb8SJulian Andres Klode 4650cab4cb8SJulian Andres Klode spin_unlock(&nvec->rx_lock); 4660cab4cb8SJulian Andres Klode 4670cab4cb8SJulian Andres Klode nvec->state = 0; 4680cab4cb8SJulian Andres Klode 4690cab4cb8SJulian Andres Klode if (!nvec_msg_is_event(nvec->rx)) 4700cab4cb8SJulian Andres Klode complete(&nvec->ec_transfer); 4710cab4cb8SJulian Andres Klode 472033d9959SLinus Torvalds schedule_work(&nvec->rx_work); 4730cab4cb8SJulian Andres Klode } 4740cab4cb8SJulian Andres Klode 4750cab4cb8SJulian Andres Klode /** 4760cab4cb8SJulian Andres Klode * nvec_invalid_flags - Send an error message about invalid flags and jump 4770cab4cb8SJulian Andres Klode * @nvec: The nvec device 4780cab4cb8SJulian Andres Klode * @status: The status flags 4790cab4cb8SJulian Andres Klode * @reset: Whether we shall jump to state 0. 4800cab4cb8SJulian Andres Klode */ 4810cab4cb8SJulian Andres Klode static void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status, 4820cab4cb8SJulian Andres Klode bool reset) 4830cab4cb8SJulian Andres Klode { 4840cab4cb8SJulian Andres Klode dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n", 4850cab4cb8SJulian Andres Klode status, nvec->state); 4860cab4cb8SJulian Andres Klode if (reset) 4870cab4cb8SJulian Andres Klode nvec->state = 0; 4880cab4cb8SJulian Andres Klode } 4890cab4cb8SJulian Andres Klode 4900cab4cb8SJulian Andres Klode /** 4910cab4cb8SJulian Andres Klode * nvec_tx_set - Set the message to transfer (nvec->tx) 492bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 493bdf034d9SJulian Andres Klode * 494bdf034d9SJulian Andres Klode * Gets the first entry from the tx_data list of @nvec and sets the 495bdf034d9SJulian Andres Klode * tx member to it. If the tx_data list is empty, this uses the 496bdf034d9SJulian Andres Klode * tx_scratch message to send a no operation message. 4970cab4cb8SJulian Andres Klode */ 4980cab4cb8SJulian Andres Klode static void nvec_tx_set(struct nvec_chip *nvec) 4990cab4cb8SJulian Andres Klode { 5000cab4cb8SJulian Andres Klode spin_lock(&nvec->tx_lock); 5010cab4cb8SJulian Andres Klode if (list_empty(&nvec->tx_data)) { 5020cab4cb8SJulian Andres Klode dev_err(nvec->dev, "empty tx - sending no-op\n"); 5030cab4cb8SJulian Andres Klode memcpy(nvec->tx_scratch.data, "\x02\x07\x02", 3); 5040cab4cb8SJulian Andres Klode nvec->tx_scratch.size = 3; 5050cab4cb8SJulian Andres Klode nvec->tx_scratch.pos = 0; 5060cab4cb8SJulian Andres Klode nvec->tx = &nvec->tx_scratch; 5070cab4cb8SJulian Andres Klode list_add_tail(&nvec->tx->node, &nvec->tx_data); 5080cab4cb8SJulian Andres Klode } else { 5090cab4cb8SJulian Andres Klode nvec->tx = list_first_entry(&nvec->tx_data, struct nvec_msg, 5100cab4cb8SJulian Andres Klode node); 5110cab4cb8SJulian Andres Klode nvec->tx->pos = 0; 5120cab4cb8SJulian Andres Klode } 5130cab4cb8SJulian Andres Klode spin_unlock(&nvec->tx_lock); 5140cab4cb8SJulian Andres Klode 5150cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "Sending message of length %u, command 0x%x\n", 5160cab4cb8SJulian Andres Klode (uint)nvec->tx->size, nvec->tx->data[1]); 5170cab4cb8SJulian Andres Klode } 5180cab4cb8SJulian Andres Klode 5190cab4cb8SJulian Andres Klode /** 5200cab4cb8SJulian Andres Klode * nvec_interrupt - Interrupt handler 5210cab4cb8SJulian Andres Klode * @irq: The IRQ 5220cab4cb8SJulian Andres Klode * @dev: The nvec device 523bdf034d9SJulian Andres Klode * 524bdf034d9SJulian Andres Klode * Interrupt handler that fills our RX buffers and empties our TX 525bdf034d9SJulian Andres Klode * buffers. This uses a finite state machine with ridiculous amounts 526bdf034d9SJulian Andres Klode * of error checking, in order to be fairly reliable. 5270cab4cb8SJulian Andres Klode */ 528f686e9afSMarc Dietrich static irqreturn_t nvec_interrupt(int irq, void *dev) 52932890b98SMarc Dietrich { 53032890b98SMarc Dietrich unsigned long status; 5310cab4cb8SJulian Andres Klode unsigned int received = 0; 5320cab4cb8SJulian Andres Klode unsigned char to_send = 0xff; 5330cab4cb8SJulian Andres Klode const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW; 5340cab4cb8SJulian Andres Klode struct nvec_chip *nvec = dev; 5350cab4cb8SJulian Andres Klode unsigned int state = nvec->state; 53632890b98SMarc Dietrich 5370cab4cb8SJulian Andres Klode status = readl(nvec->base + I2C_SL_STATUS); 53832890b98SMarc Dietrich 5390cab4cb8SJulian Andres Klode /* Filter out some errors */ 5400cab4cb8SJulian Andres Klode if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) { 5410cab4cb8SJulian Andres Klode dev_err(nvec->dev, "unexpected irq mask %lx\n", status); 54232890b98SMarc Dietrich return IRQ_HANDLED; 5430cab4cb8SJulian Andres Klode } 5440cab4cb8SJulian Andres Klode if ((status & I2C_SL_IRQ) == 0) { 5450cab4cb8SJulian Andres Klode dev_err(nvec->dev, "Spurious IRQ\n"); 5460cab4cb8SJulian Andres Klode return IRQ_HANDLED; 5470cab4cb8SJulian Andres Klode } 5480cab4cb8SJulian Andres Klode 5490cab4cb8SJulian Andres Klode /* The EC did not request a read, so it send us something, read it */ 5500cab4cb8SJulian Andres Klode if ((status & RNW) == 0) { 5510cab4cb8SJulian Andres Klode received = readl(nvec->base + I2C_SL_RCVD); 55232890b98SMarc Dietrich if (status & RCVD) 5530cab4cb8SJulian Andres Klode writel(0, nvec->base + I2C_SL_RCVD); 5540cab4cb8SJulian Andres Klode } 55532890b98SMarc Dietrich 5560cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RCVD)) 5570cab4cb8SJulian Andres Klode nvec->state = 0; 558162c7d8cSMarc Dietrich 5590cab4cb8SJulian Andres Klode switch (nvec->state) { 5600cab4cb8SJulian Andres Klode case 0: /* Verify that its a transfer start, the rest later */ 5610cab4cb8SJulian Andres Klode if (status != (I2C_SL_IRQ | RCVD)) 5620cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, false); 5630cab4cb8SJulian Andres Klode break; 5640cab4cb8SJulian Andres Klode case 1: /* command byte */ 5650cab4cb8SJulian Andres Klode if (status != I2C_SL_IRQ) { 5660cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 56732890b98SMarc Dietrich } else { 568bb0590e2SJulian Andres Klode nvec->rx = nvec_msg_alloc(nvec, NVEC_MSG_RX); 5698da79863SJulian Andres Klode /* Should not happen in a normal world */ 5708da79863SJulian Andres Klode if (unlikely(nvec->rx == NULL)) { 5718da79863SJulian Andres Klode nvec->state = 0; 5728da79863SJulian Andres Klode break; 5738da79863SJulian Andres Klode } 5740cab4cb8SJulian Andres Klode nvec->rx->data[0] = received; 5750cab4cb8SJulian Andres Klode nvec->rx->pos = 1; 5760cab4cb8SJulian Andres Klode nvec->state = 2; 5770cab4cb8SJulian Andres Klode } 5780cab4cb8SJulian Andres Klode break; 5790cab4cb8SJulian Andres Klode case 2: /* first byte after command */ 5800cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) { 5810cab4cb8SJulian Andres Klode udelay(33); 5820cab4cb8SJulian Andres Klode if (nvec->rx->data[0] != 0x01) { 5830cab4cb8SJulian Andres Klode dev_err(nvec->dev, 5840cab4cb8SJulian Andres Klode "Read without prior read command\n"); 5850cab4cb8SJulian Andres Klode nvec->state = 0; 5860cab4cb8SJulian Andres Klode break; 5870cab4cb8SJulian Andres Klode } 5880cab4cb8SJulian Andres Klode nvec_msg_free(nvec, nvec->rx); 5890cab4cb8SJulian Andres Klode nvec->state = 3; 5900cab4cb8SJulian Andres Klode nvec_tx_set(nvec); 5910cab4cb8SJulian Andres Klode BUG_ON(nvec->tx->size < 1); 5920cab4cb8SJulian Andres Klode to_send = nvec->tx->data[0]; 5930cab4cb8SJulian Andres Klode nvec->tx->pos = 1; 5940cab4cb8SJulian Andres Klode } else if (status == (I2C_SL_IRQ)) { 5950cab4cb8SJulian Andres Klode BUG_ON(nvec->rx == NULL); 5960cab4cb8SJulian Andres Klode nvec->rx->data[1] = received; 5970cab4cb8SJulian Andres Klode nvec->rx->pos = 2; 5980cab4cb8SJulian Andres Klode nvec->state = 4; 59932890b98SMarc Dietrich } else { 6000cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 60132890b98SMarc Dietrich } 6020cab4cb8SJulian Andres Klode break; 6030cab4cb8SJulian Andres Klode case 3: /* EC does a block read, we transmit data */ 6040cab4cb8SJulian Andres Klode if (status & END_TRANS) { 6050cab4cb8SJulian Andres Klode nvec_tx_completed(nvec); 6060cab4cb8SJulian Andres Klode } else if ((status & RNW) == 0 || (status & RCVD)) { 6070cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 6080cab4cb8SJulian Andres Klode } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) { 6090cab4cb8SJulian Andres Klode to_send = nvec->tx->data[nvec->tx->pos++]; 61032890b98SMarc Dietrich } else { 6110cab4cb8SJulian Andres Klode dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n", 6120cab4cb8SJulian Andres Klode nvec->tx, 6130cab4cb8SJulian Andres Klode (uint) (nvec->tx ? nvec->tx->pos : 0), 6140cab4cb8SJulian Andres Klode (uint) (nvec->tx ? nvec->tx->size : 0)); 6150cab4cb8SJulian Andres Klode nvec->state = 0; 6160cab4cb8SJulian Andres Klode } 6170cab4cb8SJulian Andres Klode break; 6180cab4cb8SJulian Andres Klode case 4: /* EC does some write, we read the data */ 6190cab4cb8SJulian Andres Klode if ((status & (END_TRANS | RNW)) == END_TRANS) 6200cab4cb8SJulian Andres Klode nvec_rx_completed(nvec); 6210cab4cb8SJulian Andres Klode else if (status & (RNW | RCVD)) 6220cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 6230cab4cb8SJulian Andres Klode else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE) 6240cab4cb8SJulian Andres Klode nvec->rx->data[nvec->rx->pos++] = received; 6250cab4cb8SJulian Andres Klode else 6260cab4cb8SJulian Andres Klode dev_err(nvec->dev, 6270cab4cb8SJulian Andres Klode "RX buffer overflow on %p: " 6280cab4cb8SJulian Andres Klode "Trying to write byte %u of %u\n", 6290cab4cb8SJulian Andres Klode nvec->rx, nvec->rx->pos, NVEC_MSG_SIZE); 6300cab4cb8SJulian Andres Klode break; 6310cab4cb8SJulian Andres Klode default: 6320cab4cb8SJulian Andres Klode nvec->state = 0; 63332890b98SMarc Dietrich } 63432890b98SMarc Dietrich 6350cab4cb8SJulian Andres Klode /* If we are told that a new transfer starts, verify it */ 6360cab4cb8SJulian Andres Klode if ((status & (RCVD | RNW)) == RCVD) { 6370cab4cb8SJulian Andres Klode if (received != nvec->i2c_addr) 6380cab4cb8SJulian Andres Klode dev_err(nvec->dev, 6390cab4cb8SJulian Andres Klode "received address 0x%02x, expected 0x%02x\n", 6400cab4cb8SJulian Andres Klode received, nvec->i2c_addr); 6410cab4cb8SJulian Andres Klode nvec->state = 1; 64232890b98SMarc Dietrich } 6430cab4cb8SJulian Andres Klode 6440cab4cb8SJulian Andres Klode /* Send data if requested, but not on end of transmission */ 6450cab4cb8SJulian Andres Klode if ((status & (RNW | END_TRANS)) == RNW) 6460cab4cb8SJulian Andres Klode writel(to_send, nvec->base + I2C_SL_RCVD); 6470cab4cb8SJulian Andres Klode 6480cab4cb8SJulian Andres Klode /* If we have send the first byte */ 6490cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) 6500cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 1); 6510cab4cb8SJulian Andres Klode 6520cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, 6530cab4cb8SJulian Andres Klode "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n", 6540cab4cb8SJulian Andres Klode (status & RNW) == 0 ? "received" : "R=", 6550cab4cb8SJulian Andres Klode received, 6560cab4cb8SJulian Andres Klode (status & (RNW | END_TRANS)) ? "sent" : "S=", 6570cab4cb8SJulian Andres Klode to_send, 6580cab4cb8SJulian Andres Klode state, 6590cab4cb8SJulian Andres Klode status & END_TRANS ? " END_TRANS" : "", 6600cab4cb8SJulian Andres Klode status & RCVD ? " RCVD" : "", 6610cab4cb8SJulian Andres Klode status & RNW ? " RNW" : ""); 6620cab4cb8SJulian Andres Klode 663de839b8fSJulian Andres Klode 664de839b8fSJulian Andres Klode /* 665de839b8fSJulian Andres Klode * TODO: A correct fix needs to be found for this. 666de839b8fSJulian Andres Klode * 667de839b8fSJulian Andres Klode * We experience less incomplete messages with this delay than without 668de839b8fSJulian Andres Klode * it, but we don't know why. Help is appreciated. 669de839b8fSJulian Andres Klode */ 670de839b8fSJulian Andres Klode udelay(100); 671de839b8fSJulian Andres Klode 67232890b98SMarc Dietrich return IRQ_HANDLED; 67332890b98SMarc Dietrich } 67432890b98SMarc Dietrich 675f686e9afSMarc Dietrich static void tegra_init_i2c_slave(struct nvec_chip *nvec) 67632890b98SMarc Dietrich { 67732890b98SMarc Dietrich u32 val; 67832890b98SMarc Dietrich 67961c3b197SPrashant Gaikwad clk_prepare_enable(nvec->i2c_clk); 680f686e9afSMarc Dietrich 681f686e9afSMarc Dietrich tegra_periph_reset_assert(nvec->i2c_clk); 68232890b98SMarc Dietrich udelay(2); 683f686e9afSMarc Dietrich tegra_periph_reset_deassert(nvec->i2c_clk); 68432890b98SMarc Dietrich 68532890b98SMarc Dietrich val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | 68632890b98SMarc Dietrich (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); 687f686e9afSMarc Dietrich writel(val, nvec->base + I2C_CNFG); 68832890b98SMarc Dietrich 689ac810759SMarc Dietrich clk_set_rate(nvec->i2c_clk, 8 * 80000); 690ac810759SMarc Dietrich 691d3f862aeSJulian Andres Klode writel(I2C_SL_NEWSL, nvec->base + I2C_SL_CNFG); 692ac810759SMarc Dietrich writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); 693ac810759SMarc Dietrich 694ac810759SMarc Dietrich writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); 695ac810759SMarc Dietrich writel(0, nvec->base + I2C_SL_ADDR2); 696ac810759SMarc Dietrich 697ac810759SMarc Dietrich enable_irq(nvec->irq); 698ac810759SMarc Dietrich 69961c3b197SPrashant Gaikwad clk_disable_unprepare(nvec->i2c_clk); 700ac810759SMarc Dietrich } 701ac810759SMarc Dietrich 702ebefae28SMarc Dietrich #ifdef CONFIG_PM_SLEEP 703ac810759SMarc Dietrich static void nvec_disable_i2c_slave(struct nvec_chip *nvec) 704ac810759SMarc Dietrich { 705ac810759SMarc Dietrich disable_irq(nvec->irq); 706d3f862aeSJulian Andres Klode writel(I2C_SL_NEWSL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); 70761c3b197SPrashant Gaikwad clk_disable_unprepare(nvec->i2c_clk); 70832890b98SMarc Dietrich } 709ebefae28SMarc Dietrich #endif 71032890b98SMarc Dietrich 71132890b98SMarc Dietrich static void nvec_power_off(void) 71232890b98SMarc Dietrich { 71332890b98SMarc Dietrich nvec_write_async(nvec_power_handle, EC_DISABLE_EVENT_REPORTING, 3); 71432890b98SMarc Dietrich nvec_write_async(nvec_power_handle, "\x04\x01", 2); 71532890b98SMarc Dietrich } 71632890b98SMarc Dietrich 71746620803SBill Pemberton static int tegra_nvec_probe(struct platform_device *pdev) 71832890b98SMarc Dietrich { 719f686e9afSMarc Dietrich int err, ret; 72032890b98SMarc Dietrich struct clk *i2c_clk; 72132890b98SMarc Dietrich struct nvec_platform_data *pdata = pdev->dev.platform_data; 72232890b98SMarc Dietrich struct nvec_chip *nvec; 72332890b98SMarc Dietrich struct nvec_msg *msg; 724f686e9afSMarc Dietrich struct resource *res; 725f686e9afSMarc Dietrich void __iomem *base; 72632890b98SMarc Dietrich 727f5e3352eSMarc Dietrich nvec = devm_kzalloc(&pdev->dev, sizeof(struct nvec_chip), GFP_KERNEL); 72832890b98SMarc Dietrich if (nvec == NULL) { 72932890b98SMarc Dietrich dev_err(&pdev->dev, "failed to reserve memory\n"); 73032890b98SMarc Dietrich return -ENOMEM; 73132890b98SMarc Dietrich } 73232890b98SMarc Dietrich platform_set_drvdata(pdev, nvec); 73332890b98SMarc Dietrich nvec->dev = &pdev->dev; 7347990b0d7SMarc Dietrich 7357990b0d7SMarc Dietrich if (pdata) { 73632890b98SMarc Dietrich nvec->gpio = pdata->gpio; 737f686e9afSMarc Dietrich nvec->i2c_addr = pdata->i2c_addr; 7387990b0d7SMarc Dietrich } else if (nvec->dev->of_node) { 739103b748eSMarc Dietrich nvec->gpio = of_get_named_gpio(nvec->dev->of_node, 740103b748eSMarc Dietrich "request-gpios", 0); 7417990b0d7SMarc Dietrich if (nvec->gpio < 0) { 7427990b0d7SMarc Dietrich dev_err(&pdev->dev, "no gpio specified"); 743f5e3352eSMarc Dietrich return -ENODEV; 7447990b0d7SMarc Dietrich } 745103b748eSMarc Dietrich if (of_property_read_u32(nvec->dev->of_node, 746103b748eSMarc Dietrich "slave-addr", &nvec->i2c_addr)) { 7477990b0d7SMarc Dietrich dev_err(&pdev->dev, "no i2c address specified"); 748f5e3352eSMarc Dietrich return -ENODEV; 7497990b0d7SMarc Dietrich } 7507990b0d7SMarc Dietrich } else { 7517990b0d7SMarc Dietrich dev_err(&pdev->dev, "no platform data\n"); 752f5e3352eSMarc Dietrich return -ENODEV; 7537990b0d7SMarc Dietrich } 75432890b98SMarc Dietrich 755f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 756f686e9afSMarc Dietrich if (!res) { 757f686e9afSMarc Dietrich dev_err(&pdev->dev, "no mem resource?\n"); 758f686e9afSMarc Dietrich return -ENODEV; 75932890b98SMarc Dietrich } 76032890b98SMarc Dietrich 761f5e3352eSMarc Dietrich base = devm_request_and_ioremap(&pdev->dev, res); 762f686e9afSMarc Dietrich if (!base) { 763f686e9afSMarc Dietrich dev_err(&pdev->dev, "Can't ioremap I2C region\n"); 764f686e9afSMarc Dietrich return -ENOMEM; 765f686e9afSMarc Dietrich } 76632890b98SMarc Dietrich 767f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 768f686e9afSMarc Dietrich if (!res) { 769f686e9afSMarc Dietrich dev_err(&pdev->dev, "no irq resource?\n"); 770f5e3352eSMarc Dietrich return -ENODEV; 771f686e9afSMarc Dietrich } 772f686e9afSMarc Dietrich 7731e54f0a2SPrashant Gaikwad i2c_clk = clk_get(&pdev->dev, "div-clk"); 774f686e9afSMarc Dietrich if (IS_ERR(i2c_clk)) { 775f686e9afSMarc Dietrich dev_err(nvec->dev, "failed to get controller clock\n"); 776f5e3352eSMarc Dietrich return -ENODEV; 77732890b98SMarc Dietrich } 77832890b98SMarc Dietrich 779f686e9afSMarc Dietrich nvec->base = base; 780f686e9afSMarc Dietrich nvec->irq = res->start; 781f686e9afSMarc Dietrich nvec->i2c_clk = i2c_clk; 7820cab4cb8SJulian Andres Klode nvec->rx = &nvec->msg_pool[0]; 783f686e9afSMarc Dietrich 78432890b98SMarc Dietrich ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); 78532890b98SMarc Dietrich 78632890b98SMarc Dietrich init_completion(&nvec->sync_write); 7870cab4cb8SJulian Andres Klode init_completion(&nvec->ec_transfer); 7880cab4cb8SJulian Andres Klode mutex_init(&nvec->sync_write_mutex); 7890cab4cb8SJulian Andres Klode spin_lock_init(&nvec->tx_lock); 7900cab4cb8SJulian Andres Klode spin_lock_init(&nvec->rx_lock); 79132890b98SMarc Dietrich INIT_LIST_HEAD(&nvec->rx_data); 7920cab4cb8SJulian Andres Klode INIT_LIST_HEAD(&nvec->tx_data); 79332890b98SMarc Dietrich INIT_WORK(&nvec->rx_work, nvec_dispatch); 79432890b98SMarc Dietrich INIT_WORK(&nvec->tx_work, nvec_request_master); 79532890b98SMarc Dietrich 796f5e3352eSMarc Dietrich err = devm_gpio_request_one(&pdev->dev, nvec->gpio, GPIOF_OUT_INIT_HIGH, 797f5e3352eSMarc Dietrich "nvec gpio"); 798aed92bbcSJulian Andres Klode if (err < 0) { 799aed92bbcSJulian Andres Klode dev_err(nvec->dev, "couldn't request gpio\n"); 800f5e3352eSMarc Dietrich return -ENODEV; 801aed92bbcSJulian Andres Klode } 802aed92bbcSJulian Andres Klode 803f5e3352eSMarc Dietrich err = devm_request_irq(&pdev->dev, nvec->irq, nvec_interrupt, 0, 804f5e3352eSMarc Dietrich "nvec", nvec); 805f686e9afSMarc Dietrich if (err) { 806f686e9afSMarc Dietrich dev_err(nvec->dev, "couldn't request irq\n"); 807f5e3352eSMarc Dietrich return -ENODEV; 808f686e9afSMarc Dietrich } 809ac810759SMarc Dietrich disable_irq(nvec->irq); 810f686e9afSMarc Dietrich 811f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 812f686e9afSMarc Dietrich 81361c3b197SPrashant Gaikwad clk_prepare_enable(i2c_clk); 814ac810759SMarc Dietrich 815f686e9afSMarc Dietrich 81632890b98SMarc Dietrich /* enable event reporting */ 81732890b98SMarc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 81832890b98SMarc Dietrich sizeof(EC_ENABLE_EVENT_REPORTING)); 81932890b98SMarc Dietrich 82032890b98SMarc Dietrich nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; 82132890b98SMarc Dietrich nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); 82232890b98SMarc Dietrich 82332890b98SMarc Dietrich nvec_power_handle = nvec; 82432890b98SMarc Dietrich pm_power_off = nvec_power_off; 82532890b98SMarc Dietrich 82632890b98SMarc Dietrich /* Get Firmware Version */ 82732890b98SMarc Dietrich msg = nvec_write_sync(nvec, EC_GET_FIRMWARE_VERSION, 82832890b98SMarc Dietrich sizeof(EC_GET_FIRMWARE_VERSION)); 82932890b98SMarc Dietrich 8300cab4cb8SJulian Andres Klode if (msg) { 83132890b98SMarc Dietrich dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", 83232890b98SMarc Dietrich msg->data[4], msg->data[5], msg->data[6], msg->data[7]); 83332890b98SMarc Dietrich 8340cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 8350cab4cb8SJulian Andres Klode } 83632890b98SMarc Dietrich 837f686e9afSMarc Dietrich ret = mfd_add_devices(nvec->dev, -1, nvec_devices, 8380848c94fSMark Brown ARRAY_SIZE(nvec_devices), base, 0, NULL); 839f686e9afSMarc Dietrich if (ret) 840f686e9afSMarc Dietrich dev_err(nvec->dev, "error adding subdevices\n"); 841f686e9afSMarc Dietrich 84232890b98SMarc Dietrich /* unmute speakers? */ 8436dca320cSMarc Dietrich nvec_write_async(nvec, "\x0d\x10\x59\x95", 4); 84432890b98SMarc Dietrich 84532890b98SMarc Dietrich /* enable lid switch event */ 84632890b98SMarc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x02\x00", 7); 84732890b98SMarc Dietrich 84832890b98SMarc Dietrich /* enable power button event */ 84932890b98SMarc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x80\x00", 7); 85032890b98SMarc Dietrich 85132890b98SMarc Dietrich return 0; 85232890b98SMarc Dietrich } 85332890b98SMarc Dietrich 8541a6a8a84SBill Pemberton static int tegra_nvec_remove(struct platform_device *pdev) 85532890b98SMarc Dietrich { 856f686e9afSMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 857f686e9afSMarc Dietrich 858f686e9afSMarc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 859f686e9afSMarc Dietrich mfd_remove_devices(nvec->dev); 860eb1e40a4STejun Heo cancel_work_sync(&nvec->rx_work); 861eb1e40a4STejun Heo cancel_work_sync(&nvec->tx_work); 862f686e9afSMarc Dietrich 86332890b98SMarc Dietrich return 0; 86432890b98SMarc Dietrich } 86532890b98SMarc Dietrich 866ebefae28SMarc Dietrich #ifdef CONFIG_PM_SLEEP 867ebefae28SMarc Dietrich static int nvec_suspend(struct device *dev) 86832890b98SMarc Dietrich { 869ebefae28SMarc Dietrich struct platform_device *pdev = to_platform_device(dev); 87032890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 8719feeb014SMarc Dietrich struct nvec_msg *msg; 87232890b98SMarc Dietrich 87332890b98SMarc Dietrich dev_dbg(nvec->dev, "suspending\n"); 8749feeb014SMarc Dietrich 8759feeb014SMarc Dietrich /* keep these sync or you'll break suspend */ 8769feeb014SMarc Dietrich msg = nvec_write_sync(nvec, EC_DISABLE_EVENT_REPORTING, 3); 8779feeb014SMarc Dietrich nvec_msg_free(nvec, msg); 8789feeb014SMarc Dietrich msg = nvec_write_sync(nvec, "\x04\x02", 2); 8799feeb014SMarc Dietrich nvec_msg_free(nvec, msg); 8809feeb014SMarc Dietrich 881ac810759SMarc Dietrich nvec_disable_i2c_slave(nvec); 88232890b98SMarc Dietrich 88332890b98SMarc Dietrich return 0; 88432890b98SMarc Dietrich } 88532890b98SMarc Dietrich 886ebefae28SMarc Dietrich static int nvec_resume(struct device *dev) 887162c7d8cSMarc Dietrich { 888ebefae28SMarc Dietrich struct platform_device *pdev = to_platform_device(dev); 88932890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 89032890b98SMarc Dietrich 89132890b98SMarc Dietrich dev_dbg(nvec->dev, "resuming\n"); 892f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 89332890b98SMarc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 3); 89432890b98SMarc Dietrich 89532890b98SMarc Dietrich return 0; 89632890b98SMarc Dietrich } 89732890b98SMarc Dietrich #endif 89832890b98SMarc Dietrich 899ebefae28SMarc Dietrich static const SIMPLE_DEV_PM_OPS(nvec_pm_ops, nvec_suspend, nvec_resume); 900ebefae28SMarc Dietrich 9017990b0d7SMarc Dietrich /* Match table for of_platform binding */ 902063f9f6aSBill Pemberton static const struct of_device_id nvidia_nvec_of_match[] = { 9037990b0d7SMarc Dietrich { .compatible = "nvidia,nvec", }, 9047990b0d7SMarc Dietrich {}, 9057990b0d7SMarc Dietrich }; 9067990b0d7SMarc Dietrich MODULE_DEVICE_TABLE(of, nvidia_nvec_of_match); 9077990b0d7SMarc Dietrich 908162c7d8cSMarc Dietrich static struct platform_driver nvec_device_driver = { 90932890b98SMarc Dietrich .probe = tegra_nvec_probe, 91044b90a3fSBill Pemberton .remove = tegra_nvec_remove, 91132890b98SMarc Dietrich .driver = { 91232890b98SMarc Dietrich .name = "nvec", 91332890b98SMarc Dietrich .owner = THIS_MODULE, 914ebefae28SMarc Dietrich .pm = &nvec_pm_ops, 9157990b0d7SMarc Dietrich .of_match_table = nvidia_nvec_of_match, 91632890b98SMarc Dietrich } 91732890b98SMarc Dietrich }; 91832890b98SMarc Dietrich 9199891b1ceSMarc Dietrich module_platform_driver(nvec_device_driver); 920162c7d8cSMarc Dietrich 92132890b98SMarc Dietrich MODULE_ALIAS("platform:nvec"); 922162c7d8cSMarc Dietrich MODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); 923162c7d8cSMarc Dietrich MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); 924162c7d8cSMarc Dietrich MODULE_LICENSE("GPL"); 925