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 74518945fbSMarc Dietrich enum nvec_sleep_subcmds { 75518945fbSMarc Dietrich GLOBAL_EVENTS, 7693eff83fSMarc Dietrich AP_PWR_DOWN, 7793eff83fSMarc Dietrich AP_SUSPEND, 78518945fbSMarc Dietrich }; 79518945fbSMarc Dietrich 8093eff83fSMarc Dietrich #define CNF_EVENT_REPORTING 0x01 8193eff83fSMarc Dietrich #define GET_FIRMWARE_VERSION 0x15 8293eff83fSMarc Dietrich #define LID_SWITCH BIT(1) 8393eff83fSMarc Dietrich #define PWR_BUTTON BIT(15) 8432890b98SMarc Dietrich 8532890b98SMarc Dietrich static struct nvec_chip *nvec_power_handle; 8632890b98SMarc Dietrich 87f686e9afSMarc Dietrich static struct mfd_cell nvec_devices[] = { 88f686e9afSMarc Dietrich { 89f686e9afSMarc Dietrich .name = "nvec-kbd", 90f686e9afSMarc Dietrich .id = 1, 91f686e9afSMarc Dietrich }, 92f686e9afSMarc Dietrich { 93f686e9afSMarc Dietrich .name = "nvec-mouse", 94f686e9afSMarc Dietrich .id = 1, 95f686e9afSMarc Dietrich }, 96f686e9afSMarc Dietrich { 97f686e9afSMarc Dietrich .name = "nvec-power", 98f686e9afSMarc Dietrich .id = 1, 99f686e9afSMarc Dietrich }, 100f686e9afSMarc Dietrich { 101f686e9afSMarc Dietrich .name = "nvec-power", 102f686e9afSMarc Dietrich .id = 2, 103f686e9afSMarc Dietrich }, 10497cc2657SIlya Petrov { 105ac562680SMarc Dietrich .name = "nvec-paz00", 10697cc2657SIlya Petrov .id = 1, 10797cc2657SIlya Petrov }, 108f686e9afSMarc Dietrich }; 109f686e9afSMarc Dietrich 110bdf034d9SJulian Andres Klode /** 111bdf034d9SJulian Andres Klode * nvec_register_notifier - Register a notifier with nvec 112bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 113bdf034d9SJulian Andres Klode * @nb: The notifier block to register 114bdf034d9SJulian Andres Klode * 115bdf034d9SJulian Andres Klode * Registers a notifier with @nvec. The notifier will be added to an atomic 116bdf034d9SJulian Andres Klode * notifier chain that is called for all received messages except those that 117bdf034d9SJulian Andres Klode * correspond to a request initiated by nvec_write_sync(). 118bdf034d9SJulian Andres Klode */ 11932890b98SMarc Dietrich int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, 12032890b98SMarc Dietrich unsigned int events) 12132890b98SMarc Dietrich { 12232890b98SMarc Dietrich return atomic_notifier_chain_register(&nvec->notifier_list, nb); 12332890b98SMarc Dietrich } 12432890b98SMarc Dietrich EXPORT_SYMBOL_GPL(nvec_register_notifier); 12532890b98SMarc Dietrich 126bdf034d9SJulian Andres Klode /** 127bdf034d9SJulian Andres Klode * nvec_status_notifier - The final notifier 128bdf034d9SJulian Andres Klode * 129bdf034d9SJulian Andres Klode * Prints a message about control events not handled in the notifier 130bdf034d9SJulian Andres Klode * chain. 131bdf034d9SJulian Andres Klode */ 132162c7d8cSMarc Dietrich static int nvec_status_notifier(struct notifier_block *nb, 133162c7d8cSMarc Dietrich unsigned long event_type, void *data) 13432890b98SMarc Dietrich { 13550d4656aSMarc Dietrich struct nvec_chip *nvec = container_of(nb, struct nvec_chip, 13650d4656aSMarc Dietrich nvec_status_notifier); 13732890b98SMarc Dietrich unsigned char *msg = (unsigned char *)data; 13832890b98SMarc Dietrich 13932890b98SMarc Dietrich if (event_type != NVEC_CNTL) 14032890b98SMarc Dietrich return NOTIFY_DONE; 14132890b98SMarc Dietrich 14250d4656aSMarc Dietrich dev_warn(nvec->dev, "unhandled msg type %ld\n", event_type); 143a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "payload: ", DUMP_PREFIX_NONE, 16, 1, 144a3a9aa1aSMarc Dietrich msg, msg[1] + 2, true); 14532890b98SMarc Dietrich 14632890b98SMarc Dietrich return NOTIFY_OK; 14732890b98SMarc Dietrich } 14832890b98SMarc Dietrich 149bdf034d9SJulian Andres Klode /** 150bdf034d9SJulian Andres Klode * nvec_msg_alloc: 151bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 152bb0590e2SJulian Andres Klode * @category: Pool category, see &enum nvec_msg_category 153bdf034d9SJulian Andres Klode * 154bdf034d9SJulian Andres Klode * Allocate a single &struct nvec_msg object from the message pool of 155bdf034d9SJulian Andres Klode * @nvec. The result shall be passed to nvec_msg_free() if no longer 156bdf034d9SJulian Andres Klode * used. 157bb0590e2SJulian Andres Klode * 158bb0590e2SJulian Andres Klode * Outgoing messages are placed in the upper 75% of the pool, keeping the 159bb0590e2SJulian Andres Klode * lower 25% available for RX buffers only. The reason is to prevent a 160bb0590e2SJulian Andres Klode * situation where all buffers are full and a message is thus endlessly 161bb0590e2SJulian Andres Klode * retried because the response could never be processed. 162bdf034d9SJulian Andres Klode */ 163bb0590e2SJulian Andres Klode static struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec, 164bb0590e2SJulian Andres Klode enum nvec_msg_category category) 1650b1076c4SJulian Andres Klode { 166bb0590e2SJulian Andres Klode int i = (category == NVEC_MSG_TX) ? (NVEC_POOL_SIZE / 4) : 0; 1670b1076c4SJulian Andres Klode 168bb0590e2SJulian Andres Klode for (; i < NVEC_POOL_SIZE; i++) { 1690b1076c4SJulian Andres Klode if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { 1700b1076c4SJulian Andres Klode dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); 1710b1076c4SJulian Andres Klode return &nvec->msg_pool[i]; 1720b1076c4SJulian Andres Klode } 1730b1076c4SJulian Andres Klode } 1740b1076c4SJulian Andres Klode 175bb0590e2SJulian Andres Klode dev_err(nvec->dev, "could not allocate %s buffer\n", 176bb0590e2SJulian Andres Klode (category == NVEC_MSG_TX) ? "TX" : "RX"); 1770b1076c4SJulian Andres Klode 1780b1076c4SJulian Andres Klode return NULL; 1790b1076c4SJulian Andres Klode } 1800b1076c4SJulian Andres Klode 181bdf034d9SJulian Andres Klode /** 182bdf034d9SJulian Andres Klode * nvec_msg_free: 183bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 184bdf034d9SJulian Andres Klode * @msg: A message (must be allocated by nvec_msg_alloc() and belong to @nvec) 185bdf034d9SJulian Andres Klode * 186bdf034d9SJulian Andres Klode * Free the given message 187bdf034d9SJulian Andres Klode */ 188705a4212SDenis Efremov void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) 1890b1076c4SJulian Andres Klode { 1907b770657SJulian Andres Klode if (msg != &nvec->tx_scratch) 1910b1076c4SJulian Andres Klode dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); 1920b1076c4SJulian Andres Klode atomic_set(&msg->used, 0); 1930b1076c4SJulian Andres Klode } 194198dd267SJulian Andres Klode EXPORT_SYMBOL_GPL(nvec_msg_free); 1950b1076c4SJulian Andres Klode 1968517e879SJulian Andres Klode /** 1978517e879SJulian Andres Klode * nvec_msg_is_event - Return %true if @msg is an event 1988517e879SJulian Andres Klode * @msg: A message 1998517e879SJulian Andres Klode */ 2008517e879SJulian Andres Klode static bool nvec_msg_is_event(struct nvec_msg *msg) 2018517e879SJulian Andres Klode { 2028517e879SJulian Andres Klode return msg->data[0] >> 7; 2038517e879SJulian Andres Klode } 2048517e879SJulian Andres Klode 2058517e879SJulian Andres Klode /** 2068517e879SJulian Andres Klode * nvec_msg_size - Get the size of a message 2078517e879SJulian Andres Klode * @msg: The message to get the size for 2088517e879SJulian Andres Klode * 2098517e879SJulian Andres Klode * This only works for received messages, not for outgoing messages. 2108517e879SJulian Andres Klode */ 2118517e879SJulian Andres Klode static size_t nvec_msg_size(struct nvec_msg *msg) 2128517e879SJulian Andres Klode { 2138517e879SJulian Andres Klode bool is_event = nvec_msg_is_event(msg); 2148517e879SJulian Andres Klode int event_length = (msg->data[0] & 0x60) >> 5; 2158517e879SJulian Andres Klode 2168517e879SJulian Andres Klode /* for variable size, payload size in byte 1 + count (1) + cmd (1) */ 2178517e879SJulian Andres Klode if (!is_event || event_length == NVEC_VAR_SIZE) 2188517e879SJulian Andres Klode return (msg->pos || msg->size) ? (msg->data[1] + 2) : 0; 2198517e879SJulian Andres Klode else if (event_length == NVEC_2BYTES) 2208517e879SJulian Andres Klode return 2; 2218517e879SJulian Andres Klode else if (event_length == NVEC_3BYTES) 2228517e879SJulian Andres Klode return 3; 2238517e879SJulian Andres Klode else 2248517e879SJulian Andres Klode return 0; 2258517e879SJulian Andres Klode } 2268517e879SJulian Andres Klode 227bdf034d9SJulian Andres Klode /** 228bdf034d9SJulian Andres Klode * nvec_gpio_set_value - Set the GPIO value 229bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 230bdf034d9SJulian Andres Klode * @value: The value to write (0 or 1) 231bdf034d9SJulian Andres Klode * 232bdf034d9SJulian Andres Klode * Like gpio_set_value(), but generating debugging information 233bdf034d9SJulian Andres Klode */ 234e7c40851SJulian Andres Klode static void nvec_gpio_set_value(struct nvec_chip *nvec, int value) 235e7c40851SJulian Andres Klode { 236e7c40851SJulian Andres Klode dev_dbg(nvec->dev, "GPIO changed from %u to %u\n", 237e7c40851SJulian Andres Klode gpio_get_value(nvec->gpio), value); 238e7c40851SJulian Andres Klode gpio_set_value(nvec->gpio, value); 239e7c40851SJulian Andres Klode } 240e7c40851SJulian Andres Klode 241bdf034d9SJulian Andres Klode /** 242bdf034d9SJulian Andres Klode * nvec_write_async - Asynchronously write a message to NVEC 243bdf034d9SJulian Andres Klode * @nvec: An nvec_chip instance 244bdf034d9SJulian Andres Klode * @data: The message data, starting with the request type 245bdf034d9SJulian Andres Klode * @size: The size of @data 246bdf034d9SJulian Andres Klode * 247bdf034d9SJulian Andres Klode * Queue a single message to be transferred to the embedded controller 248bdf034d9SJulian Andres Klode * and return immediately. 249bdf034d9SJulian Andres Klode * 250bdf034d9SJulian Andres Klode * Returns: 0 on success, a negative error code on failure. If a failure 251bdf034d9SJulian Andres Klode * occured, the nvec driver may print an error. 252bdf034d9SJulian Andres Klode */ 2531b9bf629SJulian Andres Klode int nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, 254162c7d8cSMarc Dietrich short size) 25532890b98SMarc Dietrich { 2560cab4cb8SJulian Andres Klode struct nvec_msg *msg; 2570cab4cb8SJulian Andres Klode unsigned long flags; 25832890b98SMarc Dietrich 259bb0590e2SJulian Andres Klode msg = nvec_msg_alloc(nvec, NVEC_MSG_TX); 260bb0590e2SJulian Andres Klode 2611b9bf629SJulian Andres Klode if (msg == NULL) 2621b9bf629SJulian Andres Klode return -ENOMEM; 2631b9bf629SJulian Andres Klode 26432890b98SMarc Dietrich msg->data[0] = size; 26532890b98SMarc Dietrich memcpy(msg->data + 1, data, size); 26632890b98SMarc Dietrich msg->size = size + 1; 26732890b98SMarc Dietrich 2680cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 26932890b98SMarc Dietrich list_add_tail(&msg->node, &nvec->tx_data); 2700cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 27132890b98SMarc Dietrich 272033d9959SLinus Torvalds schedule_work(&nvec->tx_work); 2731b9bf629SJulian Andres Klode 2741b9bf629SJulian Andres Klode return 0; 27532890b98SMarc Dietrich } 27632890b98SMarc Dietrich EXPORT_SYMBOL(nvec_write_async); 27732890b98SMarc Dietrich 278bdf034d9SJulian Andres Klode /** 279bdf034d9SJulian Andres Klode * nvec_write_sync - Write a message to nvec and read the response 280bdf034d9SJulian Andres Klode * @nvec: An &struct nvec_chip 281bdf034d9SJulian Andres Klode * @data: The data to write 282bdf034d9SJulian Andres Klode * @size: The size of @data 283bdf034d9SJulian Andres Klode * 284bdf034d9SJulian Andres Klode * This is similar to nvec_write_async(), but waits for the 285bdf034d9SJulian Andres Klode * request to be answered before returning. This function 286bdf034d9SJulian Andres Klode * uses a mutex and can thus not be called from e.g. 287bdf034d9SJulian Andres Klode * interrupt handlers. 288bdf034d9SJulian Andres Klode * 289bdf034d9SJulian Andres Klode * Returns: A pointer to the response message on success, 290198dd267SJulian Andres Klode * %NULL on failure. Free with nvec_msg_free() once no longer 291198dd267SJulian Andres Klode * used. 292bdf034d9SJulian Andres Klode */ 2930cab4cb8SJulian Andres Klode struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, 2940cab4cb8SJulian Andres Klode const unsigned char *data, short size) 2950cab4cb8SJulian Andres Klode { 2960cab4cb8SJulian Andres Klode struct nvec_msg *msg; 2970cab4cb8SJulian Andres Klode 2980cab4cb8SJulian Andres Klode mutex_lock(&nvec->sync_write_mutex); 2990cab4cb8SJulian Andres Klode 3000cab4cb8SJulian Andres Klode nvec->sync_write_pending = (data[1] << 8) + data[0]; 3011b9bf629SJulian Andres Klode 3024b8bf03dSMarc Dietrich if (nvec_write_async(nvec, data, size) < 0) { 3034b8bf03dSMarc Dietrich mutex_unlock(&nvec->sync_write_mutex); 3041b9bf629SJulian Andres Klode return NULL; 3054b8bf03dSMarc Dietrich } 3060cab4cb8SJulian Andres Klode 3070cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", 3080cab4cb8SJulian Andres Klode nvec->sync_write_pending); 3090cab4cb8SJulian Andres Klode if (!(wait_for_completion_timeout(&nvec->sync_write, 3100cab4cb8SJulian Andres Klode msecs_to_jiffies(2000)))) { 3110cab4cb8SJulian Andres Klode dev_warn(nvec->dev, "timeout waiting for sync write to complete\n"); 3120cab4cb8SJulian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3130cab4cb8SJulian Andres Klode return NULL; 3140cab4cb8SJulian Andres Klode } 3150cab4cb8SJulian Andres Klode 3160cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); 3170cab4cb8SJulian Andres Klode 3180cab4cb8SJulian Andres Klode msg = nvec->last_sync_msg; 3190cab4cb8SJulian Andres Klode 3200cab4cb8SJulian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3210cab4cb8SJulian Andres Klode 3220cab4cb8SJulian Andres Klode return msg; 3230cab4cb8SJulian Andres Klode } 3240cab4cb8SJulian Andres Klode EXPORT_SYMBOL(nvec_write_sync); 3250cab4cb8SJulian Andres Klode 326bdf034d9SJulian Andres Klode /** 327518945fbSMarc Dietrich * nvec_toggle_global_events - enables or disables global event reporting 328518945fbSMarc Dietrich * @nvec: nvec handle 329518945fbSMarc Dietrich * @state: true for enable, false for disable 330518945fbSMarc Dietrich * 331518945fbSMarc Dietrich * This switches on/off global event reports by the embedded controller. 332518945fbSMarc Dietrich */ 333518945fbSMarc Dietrich static void nvec_toggle_global_events(struct nvec_chip *nvec, bool state) 334518945fbSMarc Dietrich { 335518945fbSMarc Dietrich unsigned char global_events[] = { NVEC_SLEEP, GLOBAL_EVENTS, state }; 336518945fbSMarc Dietrich 337518945fbSMarc Dietrich nvec_write_async(nvec, global_events, 3); 338518945fbSMarc Dietrich } 339518945fbSMarc Dietrich 340518945fbSMarc Dietrich /** 34193eff83fSMarc Dietrich * nvec_event_mask - fill the command string with event bitfield 34293eff83fSMarc Dietrich * ev: points to event command string 34393eff83fSMarc Dietrich * mask: bit to insert into the event mask 34493eff83fSMarc Dietrich * 34593eff83fSMarc Dietrich * Configure event command expects a 32 bit bitfield which describes 34693eff83fSMarc Dietrich * which events to enable. The bitfield has the following structure 34793eff83fSMarc Dietrich * (from highest byte to lowest): 34893eff83fSMarc Dietrich * system state bits 7-0 34993eff83fSMarc Dietrich * system state bits 15-8 35093eff83fSMarc Dietrich * oem system state bits 7-0 35193eff83fSMarc Dietrich * oem system state bits 15-8 35293eff83fSMarc Dietrich */ 35393eff83fSMarc Dietrich static void nvec_event_mask(char *ev, u32 mask) 35493eff83fSMarc Dietrich { 355815fb010SWei Yongjun ev[3] = mask >> 16 & 0xff; 356815fb010SWei Yongjun ev[4] = mask >> 24 & 0xff; 357815fb010SWei Yongjun ev[5] = mask >> 0 & 0xff; 358815fb010SWei Yongjun ev[6] = mask >> 8 & 0xff; 35993eff83fSMarc Dietrich } 36093eff83fSMarc Dietrich 36193eff83fSMarc Dietrich /** 362bdf034d9SJulian Andres Klode * nvec_request_master - Process outgoing messages 363bdf034d9SJulian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 364bdf034d9SJulian Andres Klode * 365bdf034d9SJulian Andres Klode * Processes all outgoing requests by sending the request and awaiting the 366bdf034d9SJulian Andres Klode * response, then continuing with the next request. Once a request has a 367bdf034d9SJulian Andres Klode * matching response, it will be freed and removed from the list. 368bdf034d9SJulian Andres Klode */ 36932890b98SMarc Dietrich static void nvec_request_master(struct work_struct *work) 37032890b98SMarc Dietrich { 37132890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); 3720cab4cb8SJulian Andres Klode unsigned long flags; 3730cab4cb8SJulian Andres Klode long err; 3740cab4cb8SJulian Andres Klode struct nvec_msg *msg; 37532890b98SMarc Dietrich 3760cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3770cab4cb8SJulian Andres Klode while (!list_empty(&nvec->tx_data)) { 3780cab4cb8SJulian Andres Klode msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); 3790cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 3800cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 0); 3810cab4cb8SJulian Andres Klode err = wait_for_completion_interruptible_timeout( 3820cab4cb8SJulian Andres Klode &nvec->ec_transfer, msecs_to_jiffies(5000)); 3830cab4cb8SJulian Andres Klode 3840cab4cb8SJulian Andres Klode if (err == 0) { 3850cab4cb8SJulian Andres Klode dev_warn(nvec->dev, "timeout waiting for ec transfer\n"); 3860cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 1); 3870cab4cb8SJulian Andres Klode msg->pos = 0; 3880cab4cb8SJulian Andres Klode } 3890cab4cb8SJulian Andres Klode 3900cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3910cab4cb8SJulian Andres Klode 3920cab4cb8SJulian Andres Klode if (err > 0) { 3930cab4cb8SJulian Andres Klode list_del_init(&msg->node); 3940cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 3950cab4cb8SJulian Andres Klode } 3960cab4cb8SJulian Andres Klode } 3970cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 39832890b98SMarc Dietrich } 39932890b98SMarc Dietrich 400bdf034d9SJulian Andres Klode /** 401bdf034d9SJulian Andres Klode * parse_msg - Print some information and call the notifiers on an RX message 402bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 403bdf034d9SJulian Andres Klode * @msg: A message received by @nvec 404bdf034d9SJulian Andres Klode * 405bdf034d9SJulian Andres Klode * Paarse some pieces of the message and then call the chain of notifiers 406bdf034d9SJulian Andres Klode * registered via nvec_register_notifier. 407bdf034d9SJulian Andres Klode */ 40832890b98SMarc Dietrich static int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) 40932890b98SMarc Dietrich { 41032890b98SMarc Dietrich if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { 4116a371978SAndy Shevchenko dev_err(nvec->dev, "ec responded %*ph\n", 4, msg->data); 41232890b98SMarc Dietrich return -EINVAL; 41332890b98SMarc Dietrich } 41432890b98SMarc Dietrich 415a3a9aa1aSMarc Dietrich if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) 416a3a9aa1aSMarc Dietrich print_hex_dump(KERN_WARNING, "ec system event ", 417a3a9aa1aSMarc Dietrich DUMP_PREFIX_NONE, 16, 1, msg->data, 418a3a9aa1aSMarc Dietrich msg->data[1] + 2, true); 41932890b98SMarc Dietrich 420162c7d8cSMarc Dietrich atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, 421162c7d8cSMarc Dietrich msg->data); 42232890b98SMarc Dietrich 42332890b98SMarc Dietrich return 0; 42432890b98SMarc Dietrich } 42532890b98SMarc Dietrich 426bdf034d9SJulian Andres Klode /** 427bdf034d9SJulian Andres Klode * nvec_dispatch - Process messages received from the EC 428bdf034d9SJulian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 429bdf034d9SJulian Andres Klode * 430bdf034d9SJulian Andres Klode * Process messages previously received from the EC and put into the RX 431bdf034d9SJulian Andres Klode * queue of the &struct nvec_chip instance associated with @work. 432bdf034d9SJulian Andres Klode */ 43332890b98SMarc Dietrich static void nvec_dispatch(struct work_struct *work) 43432890b98SMarc Dietrich { 43532890b98SMarc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); 4360cab4cb8SJulian Andres Klode unsigned long flags; 43732890b98SMarc Dietrich struct nvec_msg *msg; 43832890b98SMarc Dietrich 4390cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 440162c7d8cSMarc Dietrich while (!list_empty(&nvec->rx_data)) { 44132890b98SMarc Dietrich msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); 44232890b98SMarc Dietrich list_del_init(&msg->node); 4430cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 44432890b98SMarc Dietrich 445162c7d8cSMarc Dietrich if (nvec->sync_write_pending == 446162c7d8cSMarc Dietrich (msg->data[2] << 8) + msg->data[0]) { 44732890b98SMarc Dietrich dev_dbg(nvec->dev, "sync write completed!\n"); 44832890b98SMarc Dietrich nvec->sync_write_pending = 0; 44932890b98SMarc Dietrich nvec->last_sync_msg = msg; 45032890b98SMarc Dietrich complete(&nvec->sync_write); 45132890b98SMarc Dietrich } else { 45232890b98SMarc Dietrich parse_msg(nvec, msg); 4530cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 45432890b98SMarc Dietrich } 4550cab4cb8SJulian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 45632890b98SMarc Dietrich } 4570cab4cb8SJulian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 4580cab4cb8SJulian Andres Klode } 4590cab4cb8SJulian Andres Klode 460bdf034d9SJulian Andres Klode /** 461bdf034d9SJulian Andres Klode * nvec_tx_completed - Complete the current transfer 462bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 463bdf034d9SJulian Andres Klode * 464bdf034d9SJulian Andres Klode * This is called when we have received an END_TRANS on a TX transfer. 465bdf034d9SJulian Andres Klode */ 4660cab4cb8SJulian Andres Klode static void nvec_tx_completed(struct nvec_chip *nvec) 4670cab4cb8SJulian Andres Klode { 4680cab4cb8SJulian Andres Klode /* We got an END_TRANS, let's skip this, maybe there's an event */ 4690cab4cb8SJulian Andres Klode if (nvec->tx->pos != nvec->tx->size) { 4700cab4cb8SJulian Andres Klode dev_err(nvec->dev, "premature END_TRANS, resending\n"); 4710cab4cb8SJulian Andres Klode nvec->tx->pos = 0; 4720cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 0); 4730cab4cb8SJulian Andres Klode } else { 4740cab4cb8SJulian Andres Klode nvec->state = 0; 47532890b98SMarc Dietrich } 47632890b98SMarc Dietrich } 47732890b98SMarc Dietrich 478bdf034d9SJulian Andres Klode /** 479bdf034d9SJulian Andres Klode * nvec_rx_completed - Complete the current transfer 480bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 481bdf034d9SJulian Andres Klode * 482bdf034d9SJulian Andres Klode * This is called when we have received an END_TRANS on a RX transfer. 483bdf034d9SJulian Andres Klode */ 4840cab4cb8SJulian Andres Klode static void nvec_rx_completed(struct nvec_chip *nvec) 4850cab4cb8SJulian Andres Klode { 486210ceb4fSJulian Andres Klode if (nvec->rx->pos != nvec_msg_size(nvec->rx)) { 4870cab4cb8SJulian Andres Klode dev_err(nvec->dev, "RX incomplete: Expected %u bytes, got %u\n", 4880cab4cb8SJulian Andres Klode (uint) nvec_msg_size(nvec->rx), 4890cab4cb8SJulian Andres Klode (uint) nvec->rx->pos); 4900cab4cb8SJulian Andres Klode 491210ceb4fSJulian Andres Klode nvec_msg_free(nvec, nvec->rx); 492210ceb4fSJulian Andres Klode nvec->state = 0; 493d6bdcf2eSJulian Andres Klode 494d6bdcf2eSJulian Andres Klode /* Battery quirk - Often incomplete, and likes to crash */ 495d6bdcf2eSJulian Andres Klode if (nvec->rx->data[0] == NVEC_BAT) 496d6bdcf2eSJulian Andres Klode complete(&nvec->ec_transfer); 497d6bdcf2eSJulian Andres Klode 498210ceb4fSJulian Andres Klode return; 499210ceb4fSJulian Andres Klode } 500210ceb4fSJulian Andres Klode 5010cab4cb8SJulian Andres Klode spin_lock(&nvec->rx_lock); 5020cab4cb8SJulian Andres Klode 5030cab4cb8SJulian Andres Klode /* add the received data to the work list 5040cab4cb8SJulian Andres Klode and move the ring buffer pointer to the next entry */ 5050cab4cb8SJulian Andres Klode list_add_tail(&nvec->rx->node, &nvec->rx_data); 5060cab4cb8SJulian Andres Klode 5070cab4cb8SJulian Andres Klode spin_unlock(&nvec->rx_lock); 5080cab4cb8SJulian Andres Klode 5090cab4cb8SJulian Andres Klode nvec->state = 0; 5100cab4cb8SJulian Andres Klode 5110cab4cb8SJulian Andres Klode if (!nvec_msg_is_event(nvec->rx)) 5120cab4cb8SJulian Andres Klode complete(&nvec->ec_transfer); 5130cab4cb8SJulian Andres Klode 514033d9959SLinus Torvalds schedule_work(&nvec->rx_work); 5150cab4cb8SJulian Andres Klode } 5160cab4cb8SJulian Andres Klode 5170cab4cb8SJulian Andres Klode /** 5180cab4cb8SJulian Andres Klode * nvec_invalid_flags - Send an error message about invalid flags and jump 5190cab4cb8SJulian Andres Klode * @nvec: The nvec device 5200cab4cb8SJulian Andres Klode * @status: The status flags 5210cab4cb8SJulian Andres Klode * @reset: Whether we shall jump to state 0. 5220cab4cb8SJulian Andres Klode */ 5230cab4cb8SJulian Andres Klode static void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status, 5240cab4cb8SJulian Andres Klode bool reset) 5250cab4cb8SJulian Andres Klode { 5260cab4cb8SJulian Andres Klode dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n", 5270cab4cb8SJulian Andres Klode status, nvec->state); 5280cab4cb8SJulian Andres Klode if (reset) 5290cab4cb8SJulian Andres Klode nvec->state = 0; 5300cab4cb8SJulian Andres Klode } 5310cab4cb8SJulian Andres Klode 5320cab4cb8SJulian Andres Klode /** 5330cab4cb8SJulian Andres Klode * nvec_tx_set - Set the message to transfer (nvec->tx) 534bdf034d9SJulian Andres Klode * @nvec: A &struct nvec_chip 535bdf034d9SJulian Andres Klode * 536bdf034d9SJulian Andres Klode * Gets the first entry from the tx_data list of @nvec and sets the 537bdf034d9SJulian Andres Klode * tx member to it. If the tx_data list is empty, this uses the 538bdf034d9SJulian Andres Klode * tx_scratch message to send a no operation message. 5390cab4cb8SJulian Andres Klode */ 5400cab4cb8SJulian Andres Klode static void nvec_tx_set(struct nvec_chip *nvec) 5410cab4cb8SJulian Andres Klode { 5420cab4cb8SJulian Andres Klode spin_lock(&nvec->tx_lock); 5430cab4cb8SJulian Andres Klode if (list_empty(&nvec->tx_data)) { 5440cab4cb8SJulian Andres Klode dev_err(nvec->dev, "empty tx - sending no-op\n"); 5450cab4cb8SJulian Andres Klode memcpy(nvec->tx_scratch.data, "\x02\x07\x02", 3); 5460cab4cb8SJulian Andres Klode nvec->tx_scratch.size = 3; 5470cab4cb8SJulian Andres Klode nvec->tx_scratch.pos = 0; 5480cab4cb8SJulian Andres Klode nvec->tx = &nvec->tx_scratch; 5490cab4cb8SJulian Andres Klode list_add_tail(&nvec->tx->node, &nvec->tx_data); 5500cab4cb8SJulian Andres Klode } else { 5510cab4cb8SJulian Andres Klode nvec->tx = list_first_entry(&nvec->tx_data, struct nvec_msg, 5520cab4cb8SJulian Andres Klode node); 5530cab4cb8SJulian Andres Klode nvec->tx->pos = 0; 5540cab4cb8SJulian Andres Klode } 5550cab4cb8SJulian Andres Klode spin_unlock(&nvec->tx_lock); 5560cab4cb8SJulian Andres Klode 5570cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, "Sending message of length %u, command 0x%x\n", 5580cab4cb8SJulian Andres Klode (uint)nvec->tx->size, nvec->tx->data[1]); 5590cab4cb8SJulian Andres Klode } 5600cab4cb8SJulian Andres Klode 5610cab4cb8SJulian Andres Klode /** 5620cab4cb8SJulian Andres Klode * nvec_interrupt - Interrupt handler 5630cab4cb8SJulian Andres Klode * @irq: The IRQ 5640cab4cb8SJulian Andres Klode * @dev: The nvec device 565bdf034d9SJulian Andres Klode * 566bdf034d9SJulian Andres Klode * Interrupt handler that fills our RX buffers and empties our TX 567bdf034d9SJulian Andres Klode * buffers. This uses a finite state machine with ridiculous amounts 568bdf034d9SJulian Andres Klode * of error checking, in order to be fairly reliable. 5690cab4cb8SJulian Andres Klode */ 570f686e9afSMarc Dietrich static irqreturn_t nvec_interrupt(int irq, void *dev) 57132890b98SMarc Dietrich { 57232890b98SMarc Dietrich unsigned long status; 5730cab4cb8SJulian Andres Klode unsigned int received = 0; 5740cab4cb8SJulian Andres Klode unsigned char to_send = 0xff; 5750cab4cb8SJulian Andres Klode const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW; 5760cab4cb8SJulian Andres Klode struct nvec_chip *nvec = dev; 5770cab4cb8SJulian Andres Klode unsigned int state = nvec->state; 57832890b98SMarc Dietrich 5790cab4cb8SJulian Andres Klode status = readl(nvec->base + I2C_SL_STATUS); 58032890b98SMarc Dietrich 5810cab4cb8SJulian Andres Klode /* Filter out some errors */ 5820cab4cb8SJulian Andres Klode if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) { 5830cab4cb8SJulian Andres Klode dev_err(nvec->dev, "unexpected irq mask %lx\n", status); 58432890b98SMarc Dietrich return IRQ_HANDLED; 5850cab4cb8SJulian Andres Klode } 5860cab4cb8SJulian Andres Klode if ((status & I2C_SL_IRQ) == 0) { 5870cab4cb8SJulian Andres Klode dev_err(nvec->dev, "Spurious IRQ\n"); 5880cab4cb8SJulian Andres Klode return IRQ_HANDLED; 5890cab4cb8SJulian Andres Klode } 5900cab4cb8SJulian Andres Klode 5910cab4cb8SJulian Andres Klode /* The EC did not request a read, so it send us something, read it */ 5920cab4cb8SJulian Andres Klode if ((status & RNW) == 0) { 5930cab4cb8SJulian Andres Klode received = readl(nvec->base + I2C_SL_RCVD); 59432890b98SMarc Dietrich if (status & RCVD) 5950cab4cb8SJulian Andres Klode writel(0, nvec->base + I2C_SL_RCVD); 5960cab4cb8SJulian Andres Klode } 59732890b98SMarc Dietrich 5980cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RCVD)) 5990cab4cb8SJulian Andres Klode nvec->state = 0; 600162c7d8cSMarc Dietrich 6010cab4cb8SJulian Andres Klode switch (nvec->state) { 6020cab4cb8SJulian Andres Klode case 0: /* Verify that its a transfer start, the rest later */ 6030cab4cb8SJulian Andres Klode if (status != (I2C_SL_IRQ | RCVD)) 6040cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, false); 6050cab4cb8SJulian Andres Klode break; 6060cab4cb8SJulian Andres Klode case 1: /* command byte */ 6070cab4cb8SJulian Andres Klode if (status != I2C_SL_IRQ) { 6080cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 60932890b98SMarc Dietrich } else { 610bb0590e2SJulian Andres Klode nvec->rx = nvec_msg_alloc(nvec, NVEC_MSG_RX); 6118da79863SJulian Andres Klode /* Should not happen in a normal world */ 6128da79863SJulian Andres Klode if (unlikely(nvec->rx == NULL)) { 6138da79863SJulian Andres Klode nvec->state = 0; 6148da79863SJulian Andres Klode break; 6158da79863SJulian Andres Klode } 6160cab4cb8SJulian Andres Klode nvec->rx->data[0] = received; 6170cab4cb8SJulian Andres Klode nvec->rx->pos = 1; 6180cab4cb8SJulian Andres Klode nvec->state = 2; 6190cab4cb8SJulian Andres Klode } 6200cab4cb8SJulian Andres Klode break; 6210cab4cb8SJulian Andres Klode case 2: /* first byte after command */ 6220cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) { 6230cab4cb8SJulian Andres Klode udelay(33); 6240cab4cb8SJulian Andres Klode if (nvec->rx->data[0] != 0x01) { 6250cab4cb8SJulian Andres Klode dev_err(nvec->dev, 6260cab4cb8SJulian Andres Klode "Read without prior read command\n"); 6270cab4cb8SJulian Andres Klode nvec->state = 0; 6280cab4cb8SJulian Andres Klode break; 6290cab4cb8SJulian Andres Klode } 6300cab4cb8SJulian Andres Klode nvec_msg_free(nvec, nvec->rx); 6310cab4cb8SJulian Andres Klode nvec->state = 3; 6320cab4cb8SJulian Andres Klode nvec_tx_set(nvec); 6330cab4cb8SJulian Andres Klode BUG_ON(nvec->tx->size < 1); 6340cab4cb8SJulian Andres Klode to_send = nvec->tx->data[0]; 6350cab4cb8SJulian Andres Klode nvec->tx->pos = 1; 6360cab4cb8SJulian Andres Klode } else if (status == (I2C_SL_IRQ)) { 6370cab4cb8SJulian Andres Klode BUG_ON(nvec->rx == NULL); 6380cab4cb8SJulian Andres Klode nvec->rx->data[1] = received; 6390cab4cb8SJulian Andres Klode nvec->rx->pos = 2; 6400cab4cb8SJulian Andres Klode nvec->state = 4; 64132890b98SMarc Dietrich } else { 6420cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 64332890b98SMarc Dietrich } 6440cab4cb8SJulian Andres Klode break; 6450cab4cb8SJulian Andres Klode case 3: /* EC does a block read, we transmit data */ 6460cab4cb8SJulian Andres Klode if (status & END_TRANS) { 6470cab4cb8SJulian Andres Klode nvec_tx_completed(nvec); 6480cab4cb8SJulian Andres Klode } else if ((status & RNW) == 0 || (status & RCVD)) { 6490cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 6500cab4cb8SJulian Andres Klode } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) { 6510cab4cb8SJulian Andres Klode to_send = nvec->tx->data[nvec->tx->pos++]; 65232890b98SMarc Dietrich } else { 6530cab4cb8SJulian Andres Klode dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n", 6540cab4cb8SJulian Andres Klode nvec->tx, 6550cab4cb8SJulian Andres Klode (uint) (nvec->tx ? nvec->tx->pos : 0), 6560cab4cb8SJulian Andres Klode (uint) (nvec->tx ? nvec->tx->size : 0)); 6570cab4cb8SJulian Andres Klode nvec->state = 0; 6580cab4cb8SJulian Andres Klode } 6590cab4cb8SJulian Andres Klode break; 6600cab4cb8SJulian Andres Klode case 4: /* EC does some write, we read the data */ 6610cab4cb8SJulian Andres Klode if ((status & (END_TRANS | RNW)) == END_TRANS) 6620cab4cb8SJulian Andres Klode nvec_rx_completed(nvec); 6630cab4cb8SJulian Andres Klode else if (status & (RNW | RCVD)) 6640cab4cb8SJulian Andres Klode nvec_invalid_flags(nvec, status, true); 6650cab4cb8SJulian Andres Klode else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE) 6660cab4cb8SJulian Andres Klode nvec->rx->data[nvec->rx->pos++] = received; 6670cab4cb8SJulian Andres Klode else 6680cab4cb8SJulian Andres Klode dev_err(nvec->dev, 6690cab4cb8SJulian Andres Klode "RX buffer overflow on %p: " 6700cab4cb8SJulian Andres Klode "Trying to write byte %u of %u\n", 6710cab4cb8SJulian Andres Klode nvec->rx, nvec->rx->pos, NVEC_MSG_SIZE); 6720cab4cb8SJulian Andres Klode break; 6730cab4cb8SJulian Andres Klode default: 6740cab4cb8SJulian Andres Klode nvec->state = 0; 67532890b98SMarc Dietrich } 67632890b98SMarc Dietrich 6770cab4cb8SJulian Andres Klode /* If we are told that a new transfer starts, verify it */ 6780cab4cb8SJulian Andres Klode if ((status & (RCVD | RNW)) == RCVD) { 6790cab4cb8SJulian Andres Klode if (received != nvec->i2c_addr) 6800cab4cb8SJulian Andres Klode dev_err(nvec->dev, 6810cab4cb8SJulian Andres Klode "received address 0x%02x, expected 0x%02x\n", 6820cab4cb8SJulian Andres Klode received, nvec->i2c_addr); 6830cab4cb8SJulian Andres Klode nvec->state = 1; 68432890b98SMarc Dietrich } 6850cab4cb8SJulian Andres Klode 6860cab4cb8SJulian Andres Klode /* Send data if requested, but not on end of transmission */ 6870cab4cb8SJulian Andres Klode if ((status & (RNW | END_TRANS)) == RNW) 6880cab4cb8SJulian Andres Klode writel(to_send, nvec->base + I2C_SL_RCVD); 6890cab4cb8SJulian Andres Klode 6900cab4cb8SJulian Andres Klode /* If we have send the first byte */ 6910cab4cb8SJulian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) 6920cab4cb8SJulian Andres Klode nvec_gpio_set_value(nvec, 1); 6930cab4cb8SJulian Andres Klode 6940cab4cb8SJulian Andres Klode dev_dbg(nvec->dev, 6950cab4cb8SJulian Andres Klode "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n", 6960cab4cb8SJulian Andres Klode (status & RNW) == 0 ? "received" : "R=", 6970cab4cb8SJulian Andres Klode received, 6980cab4cb8SJulian Andres Klode (status & (RNW | END_TRANS)) ? "sent" : "S=", 6990cab4cb8SJulian Andres Klode to_send, 7000cab4cb8SJulian Andres Klode state, 7010cab4cb8SJulian Andres Klode status & END_TRANS ? " END_TRANS" : "", 7020cab4cb8SJulian Andres Klode status & RCVD ? " RCVD" : "", 7030cab4cb8SJulian Andres Klode status & RNW ? " RNW" : ""); 7040cab4cb8SJulian Andres Klode 705de839b8fSJulian Andres Klode 706de839b8fSJulian Andres Klode /* 707de839b8fSJulian Andres Klode * TODO: A correct fix needs to be found for this. 708de839b8fSJulian Andres Klode * 709de839b8fSJulian Andres Klode * We experience less incomplete messages with this delay than without 710de839b8fSJulian Andres Klode * it, but we don't know why. Help is appreciated. 711de839b8fSJulian Andres Klode */ 712de839b8fSJulian Andres Klode udelay(100); 713de839b8fSJulian Andres Klode 71432890b98SMarc Dietrich return IRQ_HANDLED; 71532890b98SMarc Dietrich } 71632890b98SMarc Dietrich 717f686e9afSMarc Dietrich static void tegra_init_i2c_slave(struct nvec_chip *nvec) 71832890b98SMarc Dietrich { 71932890b98SMarc Dietrich u32 val; 72032890b98SMarc Dietrich 72161c3b197SPrashant Gaikwad clk_prepare_enable(nvec->i2c_clk); 722f686e9afSMarc Dietrich 723f686e9afSMarc Dietrich tegra_periph_reset_assert(nvec->i2c_clk); 72432890b98SMarc Dietrich udelay(2); 725f686e9afSMarc Dietrich tegra_periph_reset_deassert(nvec->i2c_clk); 72632890b98SMarc Dietrich 72732890b98SMarc Dietrich val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | 72832890b98SMarc Dietrich (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); 729f686e9afSMarc Dietrich writel(val, nvec->base + I2C_CNFG); 73032890b98SMarc Dietrich 731ac810759SMarc Dietrich clk_set_rate(nvec->i2c_clk, 8 * 80000); 732ac810759SMarc Dietrich 733d3f862aeSJulian Andres Klode writel(I2C_SL_NEWSL, nvec->base + I2C_SL_CNFG); 734ac810759SMarc Dietrich writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); 735ac810759SMarc Dietrich 736ac810759SMarc Dietrich writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); 737ac810759SMarc Dietrich writel(0, nvec->base + I2C_SL_ADDR2); 738ac810759SMarc Dietrich 739ac810759SMarc Dietrich enable_irq(nvec->irq); 740ac810759SMarc Dietrich 74161c3b197SPrashant Gaikwad clk_disable_unprepare(nvec->i2c_clk); 742ac810759SMarc Dietrich } 743ac810759SMarc Dietrich 744ebefae28SMarc Dietrich #ifdef CONFIG_PM_SLEEP 745ac810759SMarc Dietrich static void nvec_disable_i2c_slave(struct nvec_chip *nvec) 746ac810759SMarc Dietrich { 747ac810759SMarc Dietrich disable_irq(nvec->irq); 748d3f862aeSJulian Andres Klode writel(I2C_SL_NEWSL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); 74961c3b197SPrashant Gaikwad clk_disable_unprepare(nvec->i2c_clk); 75032890b98SMarc Dietrich } 751ebefae28SMarc Dietrich #endif 75232890b98SMarc Dietrich 75332890b98SMarc Dietrich static void nvec_power_off(void) 75432890b98SMarc Dietrich { 75593eff83fSMarc Dietrich char ap_pwr_down[] = { NVEC_SLEEP, AP_PWR_DOWN }; 75693eff83fSMarc Dietrich 757518945fbSMarc Dietrich nvec_toggle_global_events(nvec_power_handle, false); 75893eff83fSMarc Dietrich nvec_write_async(nvec_power_handle, ap_pwr_down, 2); 75932890b98SMarc Dietrich } 76032890b98SMarc Dietrich 76146620803SBill Pemberton static int tegra_nvec_probe(struct platform_device *pdev) 76232890b98SMarc Dietrich { 763f686e9afSMarc Dietrich int err, ret; 76432890b98SMarc Dietrich struct clk *i2c_clk; 76532890b98SMarc Dietrich struct nvec_platform_data *pdata = pdev->dev.platform_data; 76632890b98SMarc Dietrich struct nvec_chip *nvec; 76732890b98SMarc Dietrich struct nvec_msg *msg; 768f686e9afSMarc Dietrich struct resource *res; 769f686e9afSMarc Dietrich void __iomem *base; 77093eff83fSMarc Dietrich char get_firmware_version[] = { NVEC_CNTL, GET_FIRMWARE_VERSION }, 77193eff83fSMarc Dietrich unmute_speakers[] = { NVEC_OEM0, 0x10, 0x59, 0x95 }, 77293eff83fSMarc Dietrich enable_event[7] = { NVEC_SYS, CNF_EVENT_REPORTING, true }; 77332890b98SMarc Dietrich 774f5e3352eSMarc Dietrich nvec = devm_kzalloc(&pdev->dev, sizeof(struct nvec_chip), GFP_KERNEL); 77532890b98SMarc Dietrich if (nvec == NULL) { 77632890b98SMarc Dietrich dev_err(&pdev->dev, "failed to reserve memory\n"); 77732890b98SMarc Dietrich return -ENOMEM; 77832890b98SMarc Dietrich } 77932890b98SMarc Dietrich platform_set_drvdata(pdev, nvec); 78032890b98SMarc Dietrich nvec->dev = &pdev->dev; 7817990b0d7SMarc Dietrich 7827990b0d7SMarc Dietrich if (pdata) { 78332890b98SMarc Dietrich nvec->gpio = pdata->gpio; 784f686e9afSMarc Dietrich nvec->i2c_addr = pdata->i2c_addr; 7857990b0d7SMarc Dietrich } else if (nvec->dev->of_node) { 786103b748eSMarc Dietrich nvec->gpio = of_get_named_gpio(nvec->dev->of_node, 787103b748eSMarc Dietrich "request-gpios", 0); 7887990b0d7SMarc Dietrich if (nvec->gpio < 0) { 7897990b0d7SMarc Dietrich dev_err(&pdev->dev, "no gpio specified"); 790f5e3352eSMarc Dietrich return -ENODEV; 7917990b0d7SMarc Dietrich } 792103b748eSMarc Dietrich if (of_property_read_u32(nvec->dev->of_node, 793103b748eSMarc Dietrich "slave-addr", &nvec->i2c_addr)) { 7947990b0d7SMarc Dietrich dev_err(&pdev->dev, "no i2c address specified"); 795f5e3352eSMarc Dietrich return -ENODEV; 7967990b0d7SMarc Dietrich } 7977990b0d7SMarc Dietrich } else { 7987990b0d7SMarc Dietrich dev_err(&pdev->dev, "no platform data\n"); 799f5e3352eSMarc Dietrich return -ENODEV; 8007990b0d7SMarc Dietrich } 80132890b98SMarc Dietrich 802f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 803f686e9afSMarc Dietrich if (!res) { 804f686e9afSMarc Dietrich dev_err(&pdev->dev, "no mem resource?\n"); 805f686e9afSMarc Dietrich return -ENODEV; 80632890b98SMarc Dietrich } 80732890b98SMarc Dietrich 80897f4be60SThierry Reding base = devm_ioremap_resource(&pdev->dev, res); 80997f4be60SThierry Reding if (IS_ERR(base)) 81097f4be60SThierry Reding return PTR_ERR(base); 81132890b98SMarc Dietrich 812f686e9afSMarc Dietrich res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 813f686e9afSMarc Dietrich if (!res) { 814f686e9afSMarc Dietrich dev_err(&pdev->dev, "no irq resource?\n"); 815f5e3352eSMarc Dietrich return -ENODEV; 816f686e9afSMarc Dietrich } 817f686e9afSMarc Dietrich 8181e54f0a2SPrashant Gaikwad i2c_clk = clk_get(&pdev->dev, "div-clk"); 819f686e9afSMarc Dietrich if (IS_ERR(i2c_clk)) { 820f686e9afSMarc Dietrich dev_err(nvec->dev, "failed to get controller clock\n"); 821f5e3352eSMarc Dietrich return -ENODEV; 82232890b98SMarc Dietrich } 82332890b98SMarc Dietrich 824f686e9afSMarc Dietrich nvec->base = base; 825f686e9afSMarc Dietrich nvec->irq = res->start; 826f686e9afSMarc Dietrich nvec->i2c_clk = i2c_clk; 8270cab4cb8SJulian Andres Klode nvec->rx = &nvec->msg_pool[0]; 828f686e9afSMarc Dietrich 82932890b98SMarc Dietrich ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); 83032890b98SMarc Dietrich 83132890b98SMarc Dietrich init_completion(&nvec->sync_write); 8320cab4cb8SJulian Andres Klode init_completion(&nvec->ec_transfer); 8330cab4cb8SJulian Andres Klode mutex_init(&nvec->sync_write_mutex); 8340cab4cb8SJulian Andres Klode spin_lock_init(&nvec->tx_lock); 8350cab4cb8SJulian Andres Klode spin_lock_init(&nvec->rx_lock); 83632890b98SMarc Dietrich INIT_LIST_HEAD(&nvec->rx_data); 8370cab4cb8SJulian Andres Klode INIT_LIST_HEAD(&nvec->tx_data); 83832890b98SMarc Dietrich INIT_WORK(&nvec->rx_work, nvec_dispatch); 83932890b98SMarc Dietrich INIT_WORK(&nvec->tx_work, nvec_request_master); 84032890b98SMarc Dietrich 841f5e3352eSMarc Dietrich err = devm_gpio_request_one(&pdev->dev, nvec->gpio, GPIOF_OUT_INIT_HIGH, 842f5e3352eSMarc Dietrich "nvec gpio"); 843aed92bbcSJulian Andres Klode if (err < 0) { 844aed92bbcSJulian Andres Klode dev_err(nvec->dev, "couldn't request gpio\n"); 845f5e3352eSMarc Dietrich return -ENODEV; 846aed92bbcSJulian Andres Klode } 847aed92bbcSJulian Andres Klode 848f5e3352eSMarc Dietrich err = devm_request_irq(&pdev->dev, nvec->irq, nvec_interrupt, 0, 849f5e3352eSMarc Dietrich "nvec", nvec); 850f686e9afSMarc Dietrich if (err) { 851f686e9afSMarc Dietrich dev_err(nvec->dev, "couldn't request irq\n"); 852f5e3352eSMarc Dietrich return -ENODEV; 853f686e9afSMarc Dietrich } 854ac810759SMarc Dietrich disable_irq(nvec->irq); 855f686e9afSMarc Dietrich 856f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 857f686e9afSMarc Dietrich 85861c3b197SPrashant Gaikwad clk_prepare_enable(i2c_clk); 859ac810759SMarc Dietrich 860f686e9afSMarc Dietrich 86132890b98SMarc Dietrich /* enable event reporting */ 862518945fbSMarc Dietrich nvec_toggle_global_events(nvec, true); 86332890b98SMarc Dietrich 86432890b98SMarc Dietrich nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; 86532890b98SMarc Dietrich nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); 86632890b98SMarc Dietrich 86732890b98SMarc Dietrich nvec_power_handle = nvec; 86832890b98SMarc Dietrich pm_power_off = nvec_power_off; 86932890b98SMarc Dietrich 87032890b98SMarc Dietrich /* Get Firmware Version */ 87193eff83fSMarc Dietrich msg = nvec_write_sync(nvec, get_firmware_version, 2); 87232890b98SMarc Dietrich 8730cab4cb8SJulian Andres Klode if (msg) { 87432890b98SMarc Dietrich dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", 87532890b98SMarc Dietrich msg->data[4], msg->data[5], msg->data[6], msg->data[7]); 87632890b98SMarc Dietrich 8770cab4cb8SJulian Andres Klode nvec_msg_free(nvec, msg); 8780cab4cb8SJulian Andres Klode } 87932890b98SMarc Dietrich 880f686e9afSMarc Dietrich ret = mfd_add_devices(nvec->dev, -1, nvec_devices, 8810848c94fSMark Brown ARRAY_SIZE(nvec_devices), base, 0, NULL); 882f686e9afSMarc Dietrich if (ret) 883f686e9afSMarc Dietrich dev_err(nvec->dev, "error adding subdevices\n"); 884f686e9afSMarc Dietrich 88532890b98SMarc Dietrich /* unmute speakers? */ 88693eff83fSMarc Dietrich nvec_write_async(nvec, unmute_speakers, 4); 88732890b98SMarc Dietrich 88832890b98SMarc Dietrich /* enable lid switch event */ 88993eff83fSMarc Dietrich nvec_event_mask(enable_event, LID_SWITCH); 89093eff83fSMarc Dietrich nvec_write_async(nvec, enable_event, 7); 89132890b98SMarc Dietrich 89232890b98SMarc Dietrich /* enable power button event */ 89393eff83fSMarc Dietrich nvec_event_mask(enable_event, PWR_BUTTON); 89493eff83fSMarc Dietrich nvec_write_async(nvec, enable_event, 7); 89532890b98SMarc Dietrich 89632890b98SMarc Dietrich return 0; 89732890b98SMarc Dietrich } 89832890b98SMarc Dietrich 8991a6a8a84SBill Pemberton static int tegra_nvec_remove(struct platform_device *pdev) 90032890b98SMarc Dietrich { 901f686e9afSMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 902f686e9afSMarc Dietrich 903518945fbSMarc Dietrich nvec_toggle_global_events(nvec, false); 904f686e9afSMarc Dietrich mfd_remove_devices(nvec->dev); 905eb1e40a4STejun Heo cancel_work_sync(&nvec->rx_work); 906eb1e40a4STejun Heo cancel_work_sync(&nvec->tx_work); 907f686e9afSMarc Dietrich 90832890b98SMarc Dietrich return 0; 90932890b98SMarc Dietrich } 91032890b98SMarc Dietrich 911ebefae28SMarc Dietrich #ifdef CONFIG_PM_SLEEP 912ebefae28SMarc Dietrich static int nvec_suspend(struct device *dev) 91332890b98SMarc Dietrich { 914ebefae28SMarc Dietrich struct platform_device *pdev = to_platform_device(dev); 91532890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 9169feeb014SMarc Dietrich struct nvec_msg *msg; 91793eff83fSMarc Dietrich char ap_suspend[] = { NVEC_SLEEP, AP_SUSPEND }; 91832890b98SMarc Dietrich 91932890b98SMarc Dietrich dev_dbg(nvec->dev, "suspending\n"); 9209feeb014SMarc Dietrich 9219feeb014SMarc Dietrich /* keep these sync or you'll break suspend */ 92293eff83fSMarc Dietrich nvec_toggle_global_events(nvec, false); 92393eff83fSMarc Dietrich 92493eff83fSMarc Dietrich msg = nvec_write_sync(nvec, ap_suspend, sizeof(ap_suspend)); 9259feeb014SMarc Dietrich nvec_msg_free(nvec, msg); 9269feeb014SMarc Dietrich 927ac810759SMarc Dietrich nvec_disable_i2c_slave(nvec); 92832890b98SMarc Dietrich 92932890b98SMarc Dietrich return 0; 93032890b98SMarc Dietrich } 93132890b98SMarc Dietrich 932ebefae28SMarc Dietrich static int nvec_resume(struct device *dev) 933162c7d8cSMarc Dietrich { 934ebefae28SMarc Dietrich struct platform_device *pdev = to_platform_device(dev); 93532890b98SMarc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 93632890b98SMarc Dietrich 93732890b98SMarc Dietrich dev_dbg(nvec->dev, "resuming\n"); 938f686e9afSMarc Dietrich tegra_init_i2c_slave(nvec); 939518945fbSMarc Dietrich nvec_toggle_global_events(nvec, true); 94032890b98SMarc Dietrich 94132890b98SMarc Dietrich return 0; 94232890b98SMarc Dietrich } 94332890b98SMarc Dietrich #endif 94432890b98SMarc Dietrich 945ebefae28SMarc Dietrich static const SIMPLE_DEV_PM_OPS(nvec_pm_ops, nvec_suspend, nvec_resume); 946ebefae28SMarc Dietrich 9477990b0d7SMarc Dietrich /* Match table for of_platform binding */ 948063f9f6aSBill Pemberton static const struct of_device_id nvidia_nvec_of_match[] = { 9497990b0d7SMarc Dietrich { .compatible = "nvidia,nvec", }, 9507990b0d7SMarc Dietrich {}, 9517990b0d7SMarc Dietrich }; 9527990b0d7SMarc Dietrich MODULE_DEVICE_TABLE(of, nvidia_nvec_of_match); 9537990b0d7SMarc Dietrich 954162c7d8cSMarc Dietrich static struct platform_driver nvec_device_driver = { 95532890b98SMarc Dietrich .probe = tegra_nvec_probe, 95644b90a3fSBill Pemberton .remove = tegra_nvec_remove, 95732890b98SMarc Dietrich .driver = { 95832890b98SMarc Dietrich .name = "nvec", 95932890b98SMarc Dietrich .owner = THIS_MODULE, 960ebefae28SMarc Dietrich .pm = &nvec_pm_ops, 9617990b0d7SMarc Dietrich .of_match_table = nvidia_nvec_of_match, 96232890b98SMarc Dietrich } 96332890b98SMarc Dietrich }; 96432890b98SMarc Dietrich 9659891b1ceSMarc Dietrich module_platform_driver(nvec_device_driver); 966162c7d8cSMarc Dietrich 96732890b98SMarc Dietrich MODULE_ALIAS("platform:nvec"); 968162c7d8cSMarc Dietrich MODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); 969162c7d8cSMarc Dietrich MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); 970162c7d8cSMarc Dietrich MODULE_LICENSE("GPL"); 971