1 // SPDX-License-Identifier: GPL-2.0
3 * drivers/i2c/busses/i2c-tegra.c
5 * Copyright (C) 2010 Google, Inc.
6 * Author: Colin Cross <ccross@android.com>
10 #include <linux/delay.h>
11 #include <linux/dmaengine.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/err.h>
14 #include <linux/i2c.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
18 #include <linux/iopoll.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/of_device.h>
22 #include <linux/pinctrl/consumer.h>
23 #include <linux/platform_device.h>
24 #include <linux/pm_runtime.h>
25 #include <linux/reset.h>
27 #define BYTES_PER_FIFO_WORD 4
29 #define I2C_CNFG 0x000
30 #define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12
31 #define I2C_CNFG_PACKET_MODE_EN BIT(10)
32 #define I2C_CNFG_NEW_MASTER_FSM BIT(11)
33 #define I2C_CNFG_MULTI_MASTER_MODE BIT(17)
34 #define I2C_STATUS 0x01C
35 #define I2C_SL_CNFG 0x020
36 #define I2C_SL_CNFG_NACK BIT(1)
37 #define I2C_SL_CNFG_NEWSL BIT(2)
38 #define I2C_SL_ADDR1 0x02c
39 #define I2C_SL_ADDR2 0x030
40 #define I2C_TX_FIFO 0x050
41 #define I2C_RX_FIFO 0x054
42 #define I2C_PACKET_TRANSFER_STATUS 0x058
43 #define I2C_FIFO_CONTROL 0x05c
44 #define I2C_FIFO_CONTROL_TX_FLUSH BIT(1)
45 #define I2C_FIFO_CONTROL_RX_FLUSH BIT(0)
46 #define I2C_FIFO_CONTROL_TX_TRIG(x) (((x) - 1) << 5)
47 #define I2C_FIFO_CONTROL_RX_TRIG(x) (((x) - 1) << 2)
48 #define I2C_FIFO_STATUS 0x060
49 #define I2C_FIFO_STATUS_TX_MASK 0xF0
50 #define I2C_FIFO_STATUS_TX_SHIFT 4
51 #define I2C_FIFO_STATUS_RX_MASK 0x0F
52 #define I2C_FIFO_STATUS_RX_SHIFT 0
53 #define I2C_INT_MASK 0x064
54 #define I2C_INT_STATUS 0x068
55 #define I2C_INT_BUS_CLR_DONE BIT(11)
56 #define I2C_INT_PACKET_XFER_COMPLETE BIT(7)
57 #define I2C_INT_NO_ACK BIT(3)
58 #define I2C_INT_ARBITRATION_LOST BIT(2)
59 #define I2C_INT_TX_FIFO_DATA_REQ BIT(1)
60 #define I2C_INT_RX_FIFO_DATA_REQ BIT(0)
61 #define I2C_CLK_DIVISOR 0x06c
62 #define I2C_CLK_DIVISOR_STD_FAST_MODE_SHIFT 16
64 #define DVC_CTRL_REG1 0x000
65 #define DVC_CTRL_REG1_INTR_EN BIT(10)
66 #define DVC_CTRL_REG3 0x008
67 #define DVC_CTRL_REG3_SW_PROG BIT(26)
68 #define DVC_CTRL_REG3_I2C_DONE_INTR_EN BIT(30)
69 #define DVC_STATUS 0x00c
70 #define DVC_STATUS_I2C_DONE_INTR BIT(30)
72 #define I2C_ERR_NONE 0x00
73 #define I2C_ERR_NO_ACK BIT(0)
74 #define I2C_ERR_ARBITRATION_LOST BIT(1)
75 #define I2C_ERR_UNKNOWN_INTERRUPT BIT(2)
76 #define I2C_ERR_RX_BUFFER_OVERFLOW BIT(3)
78 #define PACKET_HEADER0_HEADER_SIZE_SHIFT 28
79 #define PACKET_HEADER0_PACKET_ID_SHIFT 16
80 #define PACKET_HEADER0_CONT_ID_SHIFT 12
81 #define PACKET_HEADER0_PROTOCOL_I2C BIT(4)
83 #define I2C_HEADER_CONT_ON_NAK BIT(21)
84 #define I2C_HEADER_READ BIT(19)
85 #define I2C_HEADER_10BIT_ADDR BIT(18)
86 #define I2C_HEADER_IE_ENABLE BIT(17)
87 #define I2C_HEADER_REPEAT_START BIT(16)
88 #define I2C_HEADER_CONTINUE_XFER BIT(15)
89 #define I2C_HEADER_SLAVE_ADDR_SHIFT 1
91 #define I2C_BUS_CLEAR_CNFG 0x084
92 #define I2C_BC_SCLK_THRESHOLD 9
93 #define I2C_BC_SCLK_THRESHOLD_SHIFT 16
94 #define I2C_BC_STOP_COND BIT(2)
95 #define I2C_BC_TERMINATE BIT(1)
96 #define I2C_BC_ENABLE BIT(0)
97 #define I2C_BUS_CLEAR_STATUS 0x088
98 #define I2C_BC_STATUS BIT(0)
100 #define I2C_CONFIG_LOAD 0x08C
101 #define I2C_MSTR_CONFIG_LOAD BIT(0)
103 #define I2C_CLKEN_OVERRIDE 0x090
104 #define I2C_MST_CORE_CLKEN_OVR BIT(0)
106 #define I2C_CONFIG_LOAD_TIMEOUT 1000000
108 #define I2C_MST_FIFO_CONTROL 0x0b4
109 #define I2C_MST_FIFO_CONTROL_RX_FLUSH BIT(0)
110 #define I2C_MST_FIFO_CONTROL_TX_FLUSH BIT(1)
111 #define I2C_MST_FIFO_CONTROL_RX_TRIG(x) (((x) - 1) << 4)
112 #define I2C_MST_FIFO_CONTROL_TX_TRIG(x) (((x) - 1) << 16)
114 #define I2C_MST_FIFO_STATUS 0x0b8
115 #define I2C_MST_FIFO_STATUS_RX_MASK 0xff
116 #define I2C_MST_FIFO_STATUS_RX_SHIFT 0
117 #define I2C_MST_FIFO_STATUS_TX_MASK 0xff0000
118 #define I2C_MST_FIFO_STATUS_TX_SHIFT 16
120 #define I2C_INTERFACE_TIMING_0 0x94
121 #define I2C_THIGH_SHIFT 8
122 #define I2C_INTERFACE_TIMING_1 0x98
124 #define I2C_STANDARD_MODE 100000
125 #define I2C_FAST_MODE 400000
126 #define I2C_FAST_PLUS_MODE 1000000
128 /* Packet header size in bytes */
129 #define I2C_PACKET_HEADER_SIZE 12
132 * Upto I2C_PIO_MODE_MAX_LEN bytes, controller will use PIO mode,
133 * above this, controller will use DMA to fill FIFO.
134 * MAX PIO len is 20 bytes excluding packet header.
136 #define I2C_PIO_MODE_MAX_LEN 32
139 * msg_end_type: The bus control which need to be send at end of transfer.
140 * @MSG_END_STOP: Send stop pulse at end of transfer.
141 * @MSG_END_REPEAT_START: Send repeat start at end of transfer.
142 * @MSG_END_CONTINUE: The following on message is coming and so do not send
143 * stop or repeat start.
147 MSG_END_REPEAT_START,
152 * struct tegra_i2c_hw_feature : Different HW support on Tegra
153 * @has_continue_xfer_support: Continue transfer supports.
154 * @has_per_pkt_xfer_complete_irq: Has enable/disable capability for transfer
155 * complete interrupt per packet basis.
156 * @has_single_clk_source: The I2C controller has single clock source. Tegra30
157 * and earlier SoCs have two clock sources i.e. div-clk and
159 * @has_config_load_reg: Has the config load register to load the new
161 * @clk_divisor_hs_mode: Clock divisor in HS mode.
162 * @clk_divisor_std_mode: Clock divisor in standard mode. It is
163 * applicable if there is no fast clock source i.e. single clock
165 * @clk_divisor_fast_mode: Clock divisor in fast mode. It is
166 * applicable if there is no fast clock source i.e. single clock
168 * @clk_divisor_fast_plus_mode: Clock divisor in fast mode plus. It is
169 * applicable if there is no fast clock source (i.e. single
171 * @has_multi_master_mode: The I2C controller supports running in single-master
172 * or multi-master mode.
173 * @has_slcg_override_reg: The I2C controller supports a register that
174 * overrides the second level clock gating.
175 * @has_mst_fifo: The I2C controller contains the new MST FIFO interface that
176 * provides additional features and allows for longer messages to
177 * be transferred in one go.
178 * @quirks: i2c adapter quirks for limiting write/read transfer size and not
179 * allowing 0 length transfers.
180 * @supports_bus_clear: Bus Clear support to recover from bus hang during
181 * SDA stuck low from device for some unknown reasons.
182 * @has_apb_dma: Support of APBDMA on corresponding Tegra chip.
183 * @tlow_std_mode: Low period of the clock in standard mode.
184 * @thigh_std_mode: High period of the clock in standard mode.
185 * @tlow_fast_fastplus_mode: Low period of the clock in fast/fast-plus modes.
186 * @thigh_fast_fastplus_mode: High period of the clock in fast/fast-plus modes.
187 * @setup_hold_time_std_mode: Setup and hold time for start and stop conditions
189 * @setup_hold_time_fast_fast_plus_mode: Setup and hold time for start and stop
190 * conditions in fast/fast-plus modes.
191 * @setup_hold_time_hs_mode: Setup and hold time for start and stop conditions
193 * @has_interface_timing_reg: Has interface timing register to program the tuned
196 struct tegra_i2c_hw_feature {
197 bool has_continue_xfer_support;
198 bool has_per_pkt_xfer_complete_irq;
199 bool has_single_clk_source;
200 bool has_config_load_reg;
201 int clk_divisor_hs_mode;
202 int clk_divisor_std_mode;
203 int clk_divisor_fast_mode;
204 u16 clk_divisor_fast_plus_mode;
205 bool has_multi_master_mode;
206 bool has_slcg_override_reg;
208 const struct i2c_adapter_quirks *quirks;
209 bool supports_bus_clear;
213 u8 tlow_fast_fastplus_mode;
214 u8 thigh_fast_fastplus_mode;
215 u32 setup_hold_time_std_mode;
216 u32 setup_hold_time_fast_fast_plus_mode;
217 u32 setup_hold_time_hs_mode;
218 bool has_interface_timing_reg;
222 * struct tegra_i2c_dev - per device I2C context
223 * @dev: device reference for power management
224 * @hw: Tegra I2C HW feature
225 * @adapter: core I2C layer adapter information
226 * @div_clk: clock reference for div clock of I2C controller
227 * @fast_clk: clock reference for fast clock of I2C controller
228 * @rst: reset control for the I2C controller
229 * @base: ioremapped registers cookie
230 * @base_phys: physical base address of the I2C controller
231 * @cont_id: I2C controller ID, used for packet header
232 * @irq: IRQ number of transfer complete interrupt
233 * @irq_disabled: used to track whether or not the interrupt is enabled
234 * @is_dvc: identifies the DVC I2C controller, has a different register layout
235 * @msg_complete: transfer completion notifier
236 * @msg_err: error code for completed message
237 * @msg_buf: pointer to current message data
238 * @msg_buf_remaining: size of unsent data in the message buffer
239 * @msg_read: identifies read transfers
240 * @bus_clk_rate: current I2C bus clock rate
241 * @clk_divisor_non_hs_mode: clock divider for non-high-speed modes
242 * @is_multimaster_mode: track if I2C controller is in multi-master mode
243 * @xfer_lock: lock to serialize transfer submission and processing
244 * @tx_dma_chan: DMA transmit channel
245 * @rx_dma_chan: DMA receive channel
246 * @dma_phys: handle to DMA resources
247 * @dma_buf: pointer to allocated DMA buffer
248 * @dma_buf_size: DMA buffer size
249 * @is_curr_dma_xfer: indicates active DMA transfer
250 * @dma_complete: DMA completion notifier
252 struct tegra_i2c_dev {
254 const struct tegra_i2c_hw_feature *hw;
255 struct i2c_adapter adapter;
257 struct clk *fast_clk;
258 struct reset_control *rst;
260 phys_addr_t base_phys;
265 struct completion msg_complete;
268 size_t msg_buf_remaining;
271 u16 clk_divisor_non_hs_mode;
272 bool is_multimaster_mode;
273 /* xfer_lock: lock to serialize transfer submission and processing */
274 spinlock_t xfer_lock;
275 struct dma_chan *tx_dma_chan;
276 struct dma_chan *rx_dma_chan;
279 unsigned int dma_buf_size;
280 bool is_curr_dma_xfer;
281 struct completion dma_complete;
284 static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
287 writel(val, i2c_dev->base + reg);
290 static u32 dvc_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg)
292 return readl(i2c_dev->base + reg);
296 * i2c_writel and i2c_readl will offset the register if necessary to talk
297 * to the I2C block inside the DVC block
299 static unsigned long tegra_i2c_reg_addr(struct tegra_i2c_dev *i2c_dev,
303 reg += (reg >= I2C_TX_FIFO) ? 0x10 : 0x40;
307 static void i2c_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
310 writel(val, i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg));
312 /* Read back register to make sure that register writes completed */
313 if (reg != I2C_TX_FIFO)
314 readl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg));
317 static u32 i2c_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg)
319 return readl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg));
322 static void i2c_writesl(struct tegra_i2c_dev *i2c_dev, void *data,
323 unsigned long reg, int len)
325 writesl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg), data, len);
328 static void i2c_readsl(struct tegra_i2c_dev *i2c_dev, void *data,
329 unsigned long reg, int len)
331 readsl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg), data, len);
334 static void tegra_i2c_mask_irq(struct tegra_i2c_dev *i2c_dev, u32 mask)
338 int_mask = i2c_readl(i2c_dev, I2C_INT_MASK) & ~mask;
339 i2c_writel(i2c_dev, int_mask, I2C_INT_MASK);
342 static void tegra_i2c_unmask_irq(struct tegra_i2c_dev *i2c_dev, u32 mask)
346 int_mask = i2c_readl(i2c_dev, I2C_INT_MASK) | mask;
347 i2c_writel(i2c_dev, int_mask, I2C_INT_MASK);
350 static void tegra_i2c_dma_complete(void *args)
352 struct tegra_i2c_dev *i2c_dev = args;
354 complete(&i2c_dev->dma_complete);
357 static int tegra_i2c_dma_submit(struct tegra_i2c_dev *i2c_dev, size_t len)
359 struct dma_async_tx_descriptor *dma_desc;
360 enum dma_transfer_direction dir;
361 struct dma_chan *chan;
363 dev_dbg(i2c_dev->dev, "starting DMA for length: %zu\n", len);
364 reinit_completion(&i2c_dev->dma_complete);
365 dir = i2c_dev->msg_read ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
366 chan = i2c_dev->msg_read ? i2c_dev->rx_dma_chan : i2c_dev->tx_dma_chan;
367 dma_desc = dmaengine_prep_slave_single(chan, i2c_dev->dma_phys,
368 len, dir, DMA_PREP_INTERRUPT |
371 dev_err(i2c_dev->dev, "failed to get DMA descriptor\n");
375 dma_desc->callback = tegra_i2c_dma_complete;
376 dma_desc->callback_param = i2c_dev;
377 dmaengine_submit(dma_desc);
378 dma_async_issue_pending(chan);
382 static void tegra_i2c_release_dma(struct tegra_i2c_dev *i2c_dev)
384 if (i2c_dev->dma_buf) {
385 dma_free_coherent(i2c_dev->dev, i2c_dev->dma_buf_size,
386 i2c_dev->dma_buf, i2c_dev->dma_phys);
387 i2c_dev->dma_buf = NULL;
390 if (i2c_dev->tx_dma_chan) {
391 dma_release_channel(i2c_dev->tx_dma_chan);
392 i2c_dev->tx_dma_chan = NULL;
395 if (i2c_dev->rx_dma_chan) {
396 dma_release_channel(i2c_dev->rx_dma_chan);
397 i2c_dev->rx_dma_chan = NULL;
401 static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev)
403 struct dma_chan *chan;
408 if (!i2c_dev->hw->has_apb_dma)
411 if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA)) {
412 dev_dbg(i2c_dev->dev, "Support for APB DMA not enabled!\n");
416 chan = dma_request_slave_channel_reason(i2c_dev->dev, "rx");
422 i2c_dev->rx_dma_chan = chan;
424 chan = dma_request_slave_channel_reason(i2c_dev->dev, "tx");
430 i2c_dev->tx_dma_chan = chan;
432 dma_buf = dma_alloc_coherent(i2c_dev->dev, i2c_dev->dma_buf_size,
433 &dma_phys, GFP_KERNEL | __GFP_NOWARN);
435 dev_err(i2c_dev->dev, "failed to allocate the DMA buffer\n");
440 i2c_dev->dma_buf = dma_buf;
441 i2c_dev->dma_phys = dma_phys;
445 tegra_i2c_release_dma(i2c_dev);
446 if (err != -EPROBE_DEFER) {
447 dev_err(i2c_dev->dev, "cannot use DMA: %d\n", err);
448 dev_err(i2c_dev->dev, "falling back to PIO\n");
455 static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
457 unsigned long timeout = jiffies + HZ;
461 if (i2c_dev->hw->has_mst_fifo) {
462 mask = I2C_MST_FIFO_CONTROL_TX_FLUSH |
463 I2C_MST_FIFO_CONTROL_RX_FLUSH;
464 offset = I2C_MST_FIFO_CONTROL;
466 mask = I2C_FIFO_CONTROL_TX_FLUSH |
467 I2C_FIFO_CONTROL_RX_FLUSH;
468 offset = I2C_FIFO_CONTROL;
471 val = i2c_readl(i2c_dev, offset);
473 i2c_writel(i2c_dev, val, offset);
475 while (i2c_readl(i2c_dev, offset) & mask) {
476 if (time_after(jiffies, timeout)) {
477 dev_warn(i2c_dev->dev, "timeout waiting for fifo flush\n");
480 usleep_range(1000, 2000);
485 static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
489 u8 *buf = i2c_dev->msg_buf;
490 size_t buf_remaining = i2c_dev->msg_buf_remaining;
491 int words_to_transfer;
494 * Catch overflow due to message fully sent
495 * before the check for RX FIFO availability.
497 if (WARN_ON_ONCE(!(i2c_dev->msg_buf_remaining)))
500 if (i2c_dev->hw->has_mst_fifo) {
501 val = i2c_readl(i2c_dev, I2C_MST_FIFO_STATUS);
502 rx_fifo_avail = (val & I2C_MST_FIFO_STATUS_RX_MASK) >>
503 I2C_MST_FIFO_STATUS_RX_SHIFT;
505 val = i2c_readl(i2c_dev, I2C_FIFO_STATUS);
506 rx_fifo_avail = (val & I2C_FIFO_STATUS_RX_MASK) >>
507 I2C_FIFO_STATUS_RX_SHIFT;
510 /* Rounds down to not include partial word at the end of buf */
511 words_to_transfer = buf_remaining / BYTES_PER_FIFO_WORD;
512 if (words_to_transfer > rx_fifo_avail)
513 words_to_transfer = rx_fifo_avail;
515 i2c_readsl(i2c_dev, buf, I2C_RX_FIFO, words_to_transfer);
517 buf += words_to_transfer * BYTES_PER_FIFO_WORD;
518 buf_remaining -= words_to_transfer * BYTES_PER_FIFO_WORD;
519 rx_fifo_avail -= words_to_transfer;
522 * If there is a partial word at the end of buf, handle it manually to
523 * prevent overwriting past the end of buf
525 if (rx_fifo_avail > 0 && buf_remaining > 0) {
527 * buf_remaining > 3 check not needed as rx_fifo_avail == 0
528 * when (words_to_transfer was > rx_fifo_avail) earlier
531 val = i2c_readl(i2c_dev, I2C_RX_FIFO);
532 val = cpu_to_le32(val);
533 memcpy(buf, &val, buf_remaining);
538 /* RX FIFO must be drained, otherwise it's an Overflow case. */
539 if (WARN_ON_ONCE(rx_fifo_avail))
542 i2c_dev->msg_buf_remaining = buf_remaining;
543 i2c_dev->msg_buf = buf;
548 static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
552 u8 *buf = i2c_dev->msg_buf;
553 size_t buf_remaining = i2c_dev->msg_buf_remaining;
554 int words_to_transfer;
556 if (i2c_dev->hw->has_mst_fifo) {
557 val = i2c_readl(i2c_dev, I2C_MST_FIFO_STATUS);
558 tx_fifo_avail = (val & I2C_MST_FIFO_STATUS_TX_MASK) >>
559 I2C_MST_FIFO_STATUS_TX_SHIFT;
561 val = i2c_readl(i2c_dev, I2C_FIFO_STATUS);
562 tx_fifo_avail = (val & I2C_FIFO_STATUS_TX_MASK) >>
563 I2C_FIFO_STATUS_TX_SHIFT;
566 /* Rounds down to not include partial word at the end of buf */
567 words_to_transfer = buf_remaining / BYTES_PER_FIFO_WORD;
569 /* It's very common to have < 4 bytes, so optimize that case. */
570 if (words_to_transfer) {
571 if (words_to_transfer > tx_fifo_avail)
572 words_to_transfer = tx_fifo_avail;
575 * Update state before writing to FIFO. If this casues us
576 * to finish writing all bytes (AKA buf_remaining goes to 0) we
577 * have a potential for an interrupt (PACKET_XFER_COMPLETE is
578 * not maskable). We need to make sure that the isr sees
579 * buf_remaining as 0 and doesn't call us back re-entrantly.
581 buf_remaining -= words_to_transfer * BYTES_PER_FIFO_WORD;
582 tx_fifo_avail -= words_to_transfer;
583 i2c_dev->msg_buf_remaining = buf_remaining;
584 i2c_dev->msg_buf = buf +
585 words_to_transfer * BYTES_PER_FIFO_WORD;
588 i2c_writesl(i2c_dev, buf, I2C_TX_FIFO, words_to_transfer);
590 buf += words_to_transfer * BYTES_PER_FIFO_WORD;
594 * If there is a partial word at the end of buf, handle it manually to
595 * prevent reading past the end of buf, which could cross a page
596 * boundary and fault.
598 if (tx_fifo_avail > 0 && buf_remaining > 0) {
600 * buf_remaining > 3 check not needed as tx_fifo_avail == 0
601 * when (words_to_transfer was > tx_fifo_avail) earlier
602 * in this function for non-zero words_to_transfer.
604 memcpy(&val, buf, buf_remaining);
605 val = le32_to_cpu(val);
607 /* Again update before writing to FIFO to make sure isr sees. */
608 i2c_dev->msg_buf_remaining = 0;
609 i2c_dev->msg_buf = NULL;
612 i2c_writel(i2c_dev, val, I2C_TX_FIFO);
619 * One of the Tegra I2C blocks is inside the DVC (Digital Voltage Controller)
620 * block. This block is identical to the rest of the I2C blocks, except that
621 * it only supports master mode, it has registers moved around, and it needs
622 * some extra init to get it into I2C mode. The register moves are handled
623 * by i2c_readl and i2c_writel
625 static void tegra_dvc_init(struct tegra_i2c_dev *i2c_dev)
629 val = dvc_readl(i2c_dev, DVC_CTRL_REG3);
630 val |= DVC_CTRL_REG3_SW_PROG;
631 val |= DVC_CTRL_REG3_I2C_DONE_INTR_EN;
632 dvc_writel(i2c_dev, val, DVC_CTRL_REG3);
634 val = dvc_readl(i2c_dev, DVC_CTRL_REG1);
635 val |= DVC_CTRL_REG1_INTR_EN;
636 dvc_writel(i2c_dev, val, DVC_CTRL_REG1);
639 static int tegra_i2c_runtime_resume(struct device *dev)
641 struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
644 ret = pinctrl_pm_select_default_state(i2c_dev->dev);
648 if (!i2c_dev->hw->has_single_clk_source) {
649 ret = clk_enable(i2c_dev->fast_clk);
651 dev_err(i2c_dev->dev,
652 "Enabling fast clk failed, err %d\n", ret);
657 ret = clk_enable(i2c_dev->div_clk);
659 dev_err(i2c_dev->dev,
660 "Enabling div clk failed, err %d\n", ret);
661 clk_disable(i2c_dev->fast_clk);
668 static int tegra_i2c_runtime_suspend(struct device *dev)
670 struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
672 clk_disable(i2c_dev->div_clk);
673 if (!i2c_dev->hw->has_single_clk_source)
674 clk_disable(i2c_dev->fast_clk);
676 return pinctrl_pm_select_idle_state(i2c_dev->dev);
679 static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev)
681 unsigned long reg_offset;
686 if (i2c_dev->hw->has_config_load_reg) {
687 reg_offset = tegra_i2c_reg_addr(i2c_dev, I2C_CONFIG_LOAD);
688 addr = i2c_dev->base + reg_offset;
689 i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD);
691 err = readl_poll_timeout_atomic(addr, val, val == 0,
693 I2C_CONFIG_LOAD_TIMEOUT);
695 err = readl_poll_timeout(addr, val, val == 0, 1000,
696 I2C_CONFIG_LOAD_TIMEOUT);
699 dev_warn(i2c_dev->dev,
700 "timeout waiting for config load\n");
708 static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit)
712 u32 clk_divisor, clk_multiplier;
716 reset_control_assert(i2c_dev->rst);
718 reset_control_deassert(i2c_dev->rst);
721 tegra_dvc_init(i2c_dev);
723 val = I2C_CNFG_NEW_MASTER_FSM | I2C_CNFG_PACKET_MODE_EN |
724 (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT);
726 if (i2c_dev->hw->has_multi_master_mode)
727 val |= I2C_CNFG_MULTI_MASTER_MODE;
729 i2c_writel(i2c_dev, val, I2C_CNFG);
730 i2c_writel(i2c_dev, 0, I2C_INT_MASK);
732 /* Make sure clock divisor programmed correctly */
733 clk_divisor = i2c_dev->hw->clk_divisor_hs_mode;
734 clk_divisor |= i2c_dev->clk_divisor_non_hs_mode <<
735 I2C_CLK_DIVISOR_STD_FAST_MODE_SHIFT;
736 i2c_writel(i2c_dev, clk_divisor, I2C_CLK_DIVISOR);
738 if (i2c_dev->bus_clk_rate > I2C_STANDARD_MODE &&
739 i2c_dev->bus_clk_rate <= I2C_FAST_PLUS_MODE) {
740 tlow = i2c_dev->hw->tlow_fast_fastplus_mode;
741 thigh = i2c_dev->hw->thigh_fast_fastplus_mode;
742 tsu_thd = i2c_dev->hw->setup_hold_time_fast_fast_plus_mode;
744 tlow = i2c_dev->hw->tlow_std_mode;
745 thigh = i2c_dev->hw->thigh_std_mode;
746 tsu_thd = i2c_dev->hw->setup_hold_time_std_mode;
749 if (i2c_dev->hw->has_interface_timing_reg) {
750 val = (thigh << I2C_THIGH_SHIFT) | tlow;
751 i2c_writel(i2c_dev, val, I2C_INTERFACE_TIMING_0);
755 * configure setup and hold times only when tsu_thd is non-zero.
756 * otherwise, preserve the chip default values
758 if (i2c_dev->hw->has_interface_timing_reg && tsu_thd)
759 i2c_writel(i2c_dev, tsu_thd, I2C_INTERFACE_TIMING_1);
762 clk_multiplier = (tlow + thigh + 2);
763 clk_multiplier *= (i2c_dev->clk_divisor_non_hs_mode + 1);
764 err = clk_set_rate(i2c_dev->div_clk,
765 i2c_dev->bus_clk_rate * clk_multiplier);
767 dev_err(i2c_dev->dev,
768 "failed changing clock rate: %d\n", err);
773 if (!i2c_dev->is_dvc) {
774 u32 sl_cfg = i2c_readl(i2c_dev, I2C_SL_CNFG);
776 sl_cfg |= I2C_SL_CNFG_NACK | I2C_SL_CNFG_NEWSL;
777 i2c_writel(i2c_dev, sl_cfg, I2C_SL_CNFG);
778 i2c_writel(i2c_dev, 0xfc, I2C_SL_ADDR1);
779 i2c_writel(i2c_dev, 0x00, I2C_SL_ADDR2);
782 err = tegra_i2c_flush_fifos(i2c_dev);
786 if (i2c_dev->is_multimaster_mode && i2c_dev->hw->has_slcg_override_reg)
787 i2c_writel(i2c_dev, I2C_MST_CORE_CLKEN_OVR, I2C_CLKEN_OVERRIDE);
789 err = tegra_i2c_wait_for_config_load(i2c_dev);
793 if (i2c_dev->irq_disabled) {
794 i2c_dev->irq_disabled = false;
795 enable_irq(i2c_dev->irq);
801 static int tegra_i2c_disable_packet_mode(struct tegra_i2c_dev *i2c_dev)
806 * NACK interrupt is generated before the I2C controller generates
807 * the STOP condition on the bus. So wait for 2 clock periods
808 * before disabling the controller so that the STOP condition has
809 * been delivered properly.
811 udelay(DIV_ROUND_UP(2 * 1000000, i2c_dev->bus_clk_rate));
813 cnfg = i2c_readl(i2c_dev, I2C_CNFG);
814 if (cnfg & I2C_CNFG_PACKET_MODE_EN)
815 i2c_writel(i2c_dev, cnfg & ~I2C_CNFG_PACKET_MODE_EN, I2C_CNFG);
817 return tegra_i2c_wait_for_config_load(i2c_dev);
820 static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
823 const u32 status_err = I2C_INT_NO_ACK | I2C_INT_ARBITRATION_LOST;
824 struct tegra_i2c_dev *i2c_dev = dev_id;
826 status = i2c_readl(i2c_dev, I2C_INT_STATUS);
828 spin_lock(&i2c_dev->xfer_lock);
830 dev_warn(i2c_dev->dev, "irq status 0 %08x %08x %08x\n",
831 i2c_readl(i2c_dev, I2C_PACKET_TRANSFER_STATUS),
832 i2c_readl(i2c_dev, I2C_STATUS),
833 i2c_readl(i2c_dev, I2C_CNFG));
834 i2c_dev->msg_err |= I2C_ERR_UNKNOWN_INTERRUPT;
836 if (!i2c_dev->irq_disabled) {
837 disable_irq_nosync(i2c_dev->irq);
838 i2c_dev->irq_disabled = true;
843 if (unlikely(status & status_err)) {
844 tegra_i2c_disable_packet_mode(i2c_dev);
845 if (status & I2C_INT_NO_ACK)
846 i2c_dev->msg_err |= I2C_ERR_NO_ACK;
847 if (status & I2C_INT_ARBITRATION_LOST)
848 i2c_dev->msg_err |= I2C_ERR_ARBITRATION_LOST;
853 * I2C transfer is terminated during the bus clear so skip
854 * processing the other interrupts.
856 if (i2c_dev->hw->supports_bus_clear && (status & I2C_INT_BUS_CLR_DONE))
859 if (!i2c_dev->is_curr_dma_xfer) {
860 if (i2c_dev->msg_read && (status & I2C_INT_RX_FIFO_DATA_REQ)) {
861 if (tegra_i2c_empty_rx_fifo(i2c_dev)) {
863 * Overflow error condition: message fully sent,
864 * with no XFER_COMPLETE interrupt but hardware
865 * asks to transfer more.
867 i2c_dev->msg_err |= I2C_ERR_RX_BUFFER_OVERFLOW;
872 if (!i2c_dev->msg_read && (status & I2C_INT_TX_FIFO_DATA_REQ)) {
873 if (i2c_dev->msg_buf_remaining)
874 tegra_i2c_fill_tx_fifo(i2c_dev);
876 tegra_i2c_mask_irq(i2c_dev,
877 I2C_INT_TX_FIFO_DATA_REQ);
881 i2c_writel(i2c_dev, status, I2C_INT_STATUS);
883 dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR, DVC_STATUS);
886 * During message read XFER_COMPLETE interrupt is triggered prior to
887 * DMA completion and during message write XFER_COMPLETE interrupt is
888 * triggered after DMA completion.
889 * PACKETS_XFER_COMPLETE indicates completion of all bytes of transfer.
890 * so forcing msg_buf_remaining to 0 in DMA mode.
892 if (status & I2C_INT_PACKET_XFER_COMPLETE) {
893 if (i2c_dev->is_curr_dma_xfer)
894 i2c_dev->msg_buf_remaining = 0;
896 * Underflow error condition: XFER_COMPLETE before message
899 if (WARN_ON_ONCE(i2c_dev->msg_buf_remaining)) {
900 i2c_dev->msg_err |= I2C_ERR_UNKNOWN_INTERRUPT;
903 complete(&i2c_dev->msg_complete);
907 /* An error occurred, mask all interrupts */
908 tegra_i2c_mask_irq(i2c_dev, I2C_INT_NO_ACK | I2C_INT_ARBITRATION_LOST |
909 I2C_INT_PACKET_XFER_COMPLETE | I2C_INT_TX_FIFO_DATA_REQ |
910 I2C_INT_RX_FIFO_DATA_REQ);
911 if (i2c_dev->hw->supports_bus_clear)
912 tegra_i2c_mask_irq(i2c_dev, I2C_INT_BUS_CLR_DONE);
913 i2c_writel(i2c_dev, status, I2C_INT_STATUS);
915 dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR, DVC_STATUS);
917 if (i2c_dev->is_curr_dma_xfer) {
918 if (i2c_dev->msg_read)
919 dmaengine_terminate_async(i2c_dev->rx_dma_chan);
921 dmaengine_terminate_async(i2c_dev->tx_dma_chan);
923 complete(&i2c_dev->dma_complete);
926 complete(&i2c_dev->msg_complete);
928 spin_unlock(&i2c_dev->xfer_lock);
932 static void tegra_i2c_config_fifo_trig(struct tegra_i2c_dev *i2c_dev,
937 struct dma_slave_config slv_config = {0};
938 struct dma_chan *chan;
940 unsigned long reg_offset;
942 if (i2c_dev->hw->has_mst_fifo)
943 reg = I2C_MST_FIFO_CONTROL;
945 reg = I2C_FIFO_CONTROL;
947 if (i2c_dev->is_curr_dma_xfer) {
955 if (i2c_dev->msg_read) {
956 chan = i2c_dev->rx_dma_chan;
957 reg_offset = tegra_i2c_reg_addr(i2c_dev, I2C_RX_FIFO);
958 slv_config.src_addr = i2c_dev->base_phys + reg_offset;
959 slv_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
960 slv_config.src_maxburst = dma_burst;
962 if (i2c_dev->hw->has_mst_fifo)
963 val = I2C_MST_FIFO_CONTROL_RX_TRIG(dma_burst);
965 val = I2C_FIFO_CONTROL_RX_TRIG(dma_burst);
967 chan = i2c_dev->tx_dma_chan;
968 reg_offset = tegra_i2c_reg_addr(i2c_dev, I2C_TX_FIFO);
969 slv_config.dst_addr = i2c_dev->base_phys + reg_offset;
970 slv_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
971 slv_config.dst_maxburst = dma_burst;
973 if (i2c_dev->hw->has_mst_fifo)
974 val = I2C_MST_FIFO_CONTROL_TX_TRIG(dma_burst);
976 val = I2C_FIFO_CONTROL_TX_TRIG(dma_burst);
979 slv_config.device_fc = true;
980 ret = dmaengine_slave_config(chan, &slv_config);
982 dev_err(i2c_dev->dev, "DMA slave config failed: %d\n",
984 dev_err(i2c_dev->dev, "falling back to PIO\n");
985 tegra_i2c_release_dma(i2c_dev);
986 i2c_dev->is_curr_dma_xfer = false;
992 if (i2c_dev->hw->has_mst_fifo)
993 val = I2C_MST_FIFO_CONTROL_TX_TRIG(8) |
994 I2C_MST_FIFO_CONTROL_RX_TRIG(1);
996 val = I2C_FIFO_CONTROL_TX_TRIG(8) |
997 I2C_FIFO_CONTROL_RX_TRIG(1);
999 i2c_writel(i2c_dev, val, reg);
1002 static int tegra_i2c_issue_bus_clear(struct i2c_adapter *adap)
1004 struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
1006 unsigned long time_left;
1009 reinit_completion(&i2c_dev->msg_complete);
1010 reg = (I2C_BC_SCLK_THRESHOLD << I2C_BC_SCLK_THRESHOLD_SHIFT) |
1011 I2C_BC_STOP_COND | I2C_BC_TERMINATE;
1012 i2c_writel(i2c_dev, reg, I2C_BUS_CLEAR_CNFG);
1013 if (i2c_dev->hw->has_config_load_reg) {
1014 err = tegra_i2c_wait_for_config_load(i2c_dev);
1019 reg |= I2C_BC_ENABLE;
1020 i2c_writel(i2c_dev, reg, I2C_BUS_CLEAR_CNFG);
1021 tegra_i2c_unmask_irq(i2c_dev, I2C_INT_BUS_CLR_DONE);
1023 time_left = wait_for_completion_timeout(&i2c_dev->msg_complete,
1024 msecs_to_jiffies(50));
1025 if (time_left == 0) {
1026 dev_err(i2c_dev->dev, "timed out for bus clear\n");
1030 reg = i2c_readl(i2c_dev, I2C_BUS_CLEAR_STATUS);
1031 if (!(reg & I2C_BC_STATUS)) {
1032 dev_err(i2c_dev->dev,
1033 "un-recovered arbitration lost\n");
1040 static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
1041 struct i2c_msg *msg,
1042 enum msg_end_type end_state)
1046 unsigned long time_left;
1047 unsigned long flags;
1052 u16 xfer_time = 100;
1054 tegra_i2c_flush_fifos(i2c_dev);
1056 i2c_dev->msg_buf = msg->buf;
1057 i2c_dev->msg_buf_remaining = msg->len;
1058 i2c_dev->msg_err = I2C_ERR_NONE;
1059 i2c_dev->msg_read = (msg->flags & I2C_M_RD);
1060 reinit_completion(&i2c_dev->msg_complete);
1062 if (i2c_dev->msg_read)
1063 xfer_size = msg->len;
1065 xfer_size = msg->len + I2C_PACKET_HEADER_SIZE;
1067 xfer_size = ALIGN(xfer_size, BYTES_PER_FIFO_WORD);
1068 i2c_dev->is_curr_dma_xfer = (xfer_size > I2C_PIO_MODE_MAX_LEN) &&
1070 tegra_i2c_config_fifo_trig(i2c_dev, xfer_size);
1071 dma = i2c_dev->is_curr_dma_xfer;
1073 * Transfer time in mSec = Total bits / transfer rate
1074 * Total bits = 9 bits per byte (including ACK bit) + Start & stop bits
1076 xfer_time += DIV_ROUND_CLOSEST(((xfer_size * 9) + 2) * MSEC_PER_SEC,
1077 i2c_dev->bus_clk_rate);
1078 spin_lock_irqsave(&i2c_dev->xfer_lock, flags);
1080 int_mask = I2C_INT_NO_ACK | I2C_INT_ARBITRATION_LOST;
1081 tegra_i2c_unmask_irq(i2c_dev, int_mask);
1083 if (i2c_dev->msg_read) {
1084 dma_sync_single_for_device(i2c_dev->dev,
1088 err = tegra_i2c_dma_submit(i2c_dev, xfer_size);
1090 dev_err(i2c_dev->dev,
1091 "starting RX DMA failed, err %d\n",
1097 dma_sync_single_for_cpu(i2c_dev->dev,
1101 buffer = i2c_dev->dma_buf;
1105 packet_header = (0 << PACKET_HEADER0_HEADER_SIZE_SHIFT) |
1106 PACKET_HEADER0_PROTOCOL_I2C |
1107 (i2c_dev->cont_id << PACKET_HEADER0_CONT_ID_SHIFT) |
1108 (1 << PACKET_HEADER0_PACKET_ID_SHIFT);
1109 if (dma && !i2c_dev->msg_read)
1110 *buffer++ = packet_header;
1112 i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);
1114 packet_header = msg->len - 1;
1115 if (dma && !i2c_dev->msg_read)
1116 *buffer++ = packet_header;
1118 i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);
1120 packet_header = I2C_HEADER_IE_ENABLE;
1121 if (end_state == MSG_END_CONTINUE)
1122 packet_header |= I2C_HEADER_CONTINUE_XFER;
1123 else if (end_state == MSG_END_REPEAT_START)
1124 packet_header |= I2C_HEADER_REPEAT_START;
1125 if (msg->flags & I2C_M_TEN) {
1126 packet_header |= msg->addr;
1127 packet_header |= I2C_HEADER_10BIT_ADDR;
1129 packet_header |= msg->addr << I2C_HEADER_SLAVE_ADDR_SHIFT;
1131 if (msg->flags & I2C_M_IGNORE_NAK)
1132 packet_header |= I2C_HEADER_CONT_ON_NAK;
1133 if (msg->flags & I2C_M_RD)
1134 packet_header |= I2C_HEADER_READ;
1135 if (dma && !i2c_dev->msg_read)
1136 *buffer++ = packet_header;
1138 i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);
1140 if (!i2c_dev->msg_read) {
1142 memcpy(buffer, msg->buf, msg->len);
1143 dma_sync_single_for_device(i2c_dev->dev,
1147 err = tegra_i2c_dma_submit(i2c_dev, xfer_size);
1149 dev_err(i2c_dev->dev,
1150 "starting TX DMA failed, err %d\n",
1155 tegra_i2c_fill_tx_fifo(i2c_dev);
1159 if (i2c_dev->hw->has_per_pkt_xfer_complete_irq)
1160 int_mask |= I2C_INT_PACKET_XFER_COMPLETE;
1162 if (msg->flags & I2C_M_RD)
1163 int_mask |= I2C_INT_RX_FIFO_DATA_REQ;
1164 else if (i2c_dev->msg_buf_remaining)
1165 int_mask |= I2C_INT_TX_FIFO_DATA_REQ;
1168 tegra_i2c_unmask_irq(i2c_dev, int_mask);
1169 dev_dbg(i2c_dev->dev, "unmasked irq: %02x\n",
1170 i2c_readl(i2c_dev, I2C_INT_MASK));
1173 spin_unlock_irqrestore(&i2c_dev->xfer_lock, flags);
1179 time_left = wait_for_completion_timeout(&i2c_dev->dma_complete,
1180 msecs_to_jiffies(xfer_time));
1181 if (time_left == 0) {
1182 dev_err(i2c_dev->dev, "DMA transfer timeout\n");
1183 dmaengine_terminate_sync(i2c_dev->msg_read ?
1184 i2c_dev->rx_dma_chan :
1185 i2c_dev->tx_dma_chan);
1186 tegra_i2c_init(i2c_dev, true);
1190 if (i2c_dev->msg_read && i2c_dev->msg_err == I2C_ERR_NONE) {
1191 dma_sync_single_for_cpu(i2c_dev->dev,
1195 memcpy(i2c_dev->msg_buf, i2c_dev->dma_buf,
1199 if (i2c_dev->msg_err != I2C_ERR_NONE)
1200 dmaengine_synchronize(i2c_dev->msg_read ?
1201 i2c_dev->rx_dma_chan :
1202 i2c_dev->tx_dma_chan);
1205 time_left = wait_for_completion_timeout(&i2c_dev->msg_complete,
1206 msecs_to_jiffies(xfer_time));
1207 tegra_i2c_mask_irq(i2c_dev, int_mask);
1209 if (time_left == 0) {
1210 dev_err(i2c_dev->dev, "i2c transfer timed out\n");
1212 tegra_i2c_init(i2c_dev, true);
1216 dev_dbg(i2c_dev->dev, "transfer complete: %lu %d %d\n",
1217 time_left, completion_done(&i2c_dev->msg_complete),
1220 i2c_dev->is_curr_dma_xfer = false;
1221 if (likely(i2c_dev->msg_err == I2C_ERR_NONE))
1224 tegra_i2c_init(i2c_dev, true);
1225 /* start recovery upon arbitration loss in single master mode */
1226 if (i2c_dev->msg_err == I2C_ERR_ARBITRATION_LOST) {
1227 if (!i2c_dev->is_multimaster_mode)
1228 return i2c_recover_bus(&i2c_dev->adapter);
1232 if (i2c_dev->msg_err == I2C_ERR_NO_ACK) {
1233 if (msg->flags & I2C_M_IGNORE_NAK)
1241 static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
1244 struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
1248 ret = pm_runtime_get_sync(i2c_dev->dev);
1250 dev_err(i2c_dev->dev, "runtime resume failed %d\n", ret);
1254 for (i = 0; i < num; i++) {
1255 enum msg_end_type end_type = MSG_END_STOP;
1257 if (i < (num - 1)) {
1258 if (msgs[i + 1].flags & I2C_M_NOSTART)
1259 end_type = MSG_END_CONTINUE;
1261 end_type = MSG_END_REPEAT_START;
1263 ret = tegra_i2c_xfer_msg(i2c_dev, &msgs[i], end_type);
1268 pm_runtime_put(i2c_dev->dev);
1273 static u32 tegra_i2c_func(struct i2c_adapter *adap)
1275 struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
1276 u32 ret = I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) |
1277 I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING;
1279 if (i2c_dev->hw->has_continue_xfer_support)
1280 ret |= I2C_FUNC_NOSTART;
1284 static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev)
1286 struct device_node *np = i2c_dev->dev->of_node;
1290 ret = of_property_read_u32(np, "clock-frequency",
1291 &i2c_dev->bus_clk_rate);
1293 i2c_dev->bus_clk_rate = 100000; /* default clock rate */
1295 multi_mode = of_property_read_bool(np, "multi-master");
1296 i2c_dev->is_multimaster_mode = multi_mode;
1299 static const struct i2c_algorithm tegra_i2c_algo = {
1300 .master_xfer = tegra_i2c_xfer,
1301 .functionality = tegra_i2c_func,
1304 /* payload size is only 12 bit */
1305 static const struct i2c_adapter_quirks tegra_i2c_quirks = {
1306 .flags = I2C_AQ_NO_ZERO_LEN,
1307 .max_read_len = SZ_4K,
1308 .max_write_len = SZ_4K - I2C_PACKET_HEADER_SIZE,
1311 static const struct i2c_adapter_quirks tegra194_i2c_quirks = {
1312 .flags = I2C_AQ_NO_ZERO_LEN,
1313 .max_write_len = SZ_64K - I2C_PACKET_HEADER_SIZE,
1316 static struct i2c_bus_recovery_info tegra_i2c_recovery_info = {
1317 .recover_bus = tegra_i2c_issue_bus_clear,
1320 static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {
1321 .has_continue_xfer_support = false,
1322 .has_per_pkt_xfer_complete_irq = false,
1323 .has_single_clk_source = false,
1324 .clk_divisor_hs_mode = 3,
1325 .clk_divisor_std_mode = 0,
1326 .clk_divisor_fast_mode = 0,
1327 .clk_divisor_fast_plus_mode = 0,
1328 .has_config_load_reg = false,
1329 .has_multi_master_mode = false,
1330 .has_slcg_override_reg = false,
1331 .has_mst_fifo = false,
1332 .quirks = &tegra_i2c_quirks,
1333 .supports_bus_clear = false,
1334 .has_apb_dma = true,
1335 .tlow_std_mode = 0x4,
1336 .thigh_std_mode = 0x2,
1337 .tlow_fast_fastplus_mode = 0x4,
1338 .thigh_fast_fastplus_mode = 0x2,
1339 .setup_hold_time_std_mode = 0x0,
1340 .setup_hold_time_fast_fast_plus_mode = 0x0,
1341 .setup_hold_time_hs_mode = 0x0,
1342 .has_interface_timing_reg = false,
1345 static const struct tegra_i2c_hw_feature tegra30_i2c_hw = {
1346 .has_continue_xfer_support = true,
1347 .has_per_pkt_xfer_complete_irq = false,
1348 .has_single_clk_source = false,
1349 .clk_divisor_hs_mode = 3,
1350 .clk_divisor_std_mode = 0,
1351 .clk_divisor_fast_mode = 0,
1352 .clk_divisor_fast_plus_mode = 0,
1353 .has_config_load_reg = false,
1354 .has_multi_master_mode = false,
1355 .has_slcg_override_reg = false,
1356 .has_mst_fifo = false,
1357 .quirks = &tegra_i2c_quirks,
1358 .supports_bus_clear = false,
1359 .has_apb_dma = true,
1360 .tlow_std_mode = 0x4,
1361 .thigh_std_mode = 0x2,
1362 .tlow_fast_fastplus_mode = 0x4,
1363 .thigh_fast_fastplus_mode = 0x2,
1364 .setup_hold_time_std_mode = 0x0,
1365 .setup_hold_time_fast_fast_plus_mode = 0x0,
1366 .setup_hold_time_hs_mode = 0x0,
1367 .has_interface_timing_reg = false,
1370 static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
1371 .has_continue_xfer_support = true,
1372 .has_per_pkt_xfer_complete_irq = true,
1373 .has_single_clk_source = true,
1374 .clk_divisor_hs_mode = 1,
1375 .clk_divisor_std_mode = 0x19,
1376 .clk_divisor_fast_mode = 0x19,
1377 .clk_divisor_fast_plus_mode = 0x10,
1378 .has_config_load_reg = false,
1379 .has_multi_master_mode = false,
1380 .has_slcg_override_reg = false,
1381 .has_mst_fifo = false,
1382 .quirks = &tegra_i2c_quirks,
1383 .supports_bus_clear = true,
1384 .has_apb_dma = true,
1385 .tlow_std_mode = 0x4,
1386 .thigh_std_mode = 0x2,
1387 .tlow_fast_fastplus_mode = 0x4,
1388 .thigh_fast_fastplus_mode = 0x2,
1389 .setup_hold_time_std_mode = 0x0,
1390 .setup_hold_time_fast_fast_plus_mode = 0x0,
1391 .setup_hold_time_hs_mode = 0x0,
1392 .has_interface_timing_reg = false,
1395 static const struct tegra_i2c_hw_feature tegra124_i2c_hw = {
1396 .has_continue_xfer_support = true,
1397 .has_per_pkt_xfer_complete_irq = true,
1398 .has_single_clk_source = true,
1399 .clk_divisor_hs_mode = 1,
1400 .clk_divisor_std_mode = 0x19,
1401 .clk_divisor_fast_mode = 0x19,
1402 .clk_divisor_fast_plus_mode = 0x10,
1403 .has_config_load_reg = true,
1404 .has_multi_master_mode = false,
1405 .has_slcg_override_reg = true,
1406 .has_mst_fifo = false,
1407 .quirks = &tegra_i2c_quirks,
1408 .supports_bus_clear = true,
1409 .has_apb_dma = true,
1410 .tlow_std_mode = 0x4,
1411 .thigh_std_mode = 0x2,
1412 .tlow_fast_fastplus_mode = 0x4,
1413 .thigh_fast_fastplus_mode = 0x2,
1414 .setup_hold_time_std_mode = 0x0,
1415 .setup_hold_time_fast_fast_plus_mode = 0x0,
1416 .setup_hold_time_hs_mode = 0x0,
1417 .has_interface_timing_reg = true,
1420 static const struct tegra_i2c_hw_feature tegra210_i2c_hw = {
1421 .has_continue_xfer_support = true,
1422 .has_per_pkt_xfer_complete_irq = true,
1423 .has_single_clk_source = true,
1424 .clk_divisor_hs_mode = 1,
1425 .clk_divisor_std_mode = 0x19,
1426 .clk_divisor_fast_mode = 0x19,
1427 .clk_divisor_fast_plus_mode = 0x10,
1428 .has_config_load_reg = true,
1429 .has_multi_master_mode = false,
1430 .has_slcg_override_reg = true,
1431 .has_mst_fifo = false,
1432 .quirks = &tegra_i2c_quirks,
1433 .supports_bus_clear = true,
1434 .has_apb_dma = true,
1435 .tlow_std_mode = 0x4,
1436 .thigh_std_mode = 0x2,
1437 .tlow_fast_fastplus_mode = 0x4,
1438 .thigh_fast_fastplus_mode = 0x2,
1439 .setup_hold_time_std_mode = 0,
1440 .setup_hold_time_fast_fast_plus_mode = 0,
1441 .setup_hold_time_hs_mode = 0,
1442 .has_interface_timing_reg = true,
1445 static const struct tegra_i2c_hw_feature tegra186_i2c_hw = {
1446 .has_continue_xfer_support = true,
1447 .has_per_pkt_xfer_complete_irq = true,
1448 .has_single_clk_source = true,
1449 .clk_divisor_hs_mode = 1,
1450 .clk_divisor_std_mode = 0x16,
1451 .clk_divisor_fast_mode = 0x19,
1452 .clk_divisor_fast_plus_mode = 0x10,
1453 .has_config_load_reg = true,
1454 .has_multi_master_mode = false,
1455 .has_slcg_override_reg = true,
1456 .has_mst_fifo = false,
1457 .quirks = &tegra_i2c_quirks,
1458 .supports_bus_clear = true,
1459 .has_apb_dma = false,
1460 .tlow_std_mode = 0x4,
1461 .thigh_std_mode = 0x3,
1462 .tlow_fast_fastplus_mode = 0x4,
1463 .thigh_fast_fastplus_mode = 0x2,
1464 .setup_hold_time_std_mode = 0,
1465 .setup_hold_time_fast_fast_plus_mode = 0,
1466 .setup_hold_time_hs_mode = 0,
1467 .has_interface_timing_reg = true,
1470 static const struct tegra_i2c_hw_feature tegra194_i2c_hw = {
1471 .has_continue_xfer_support = true,
1472 .has_per_pkt_xfer_complete_irq = true,
1473 .has_single_clk_source = true,
1474 .clk_divisor_hs_mode = 1,
1475 .clk_divisor_std_mode = 0x4f,
1476 .clk_divisor_fast_mode = 0x3c,
1477 .clk_divisor_fast_plus_mode = 0x16,
1478 .has_config_load_reg = true,
1479 .has_multi_master_mode = true,
1480 .has_slcg_override_reg = true,
1481 .has_mst_fifo = true,
1482 .quirks = &tegra194_i2c_quirks,
1483 .supports_bus_clear = true,
1484 .has_apb_dma = false,
1485 .tlow_std_mode = 0x8,
1486 .thigh_std_mode = 0x7,
1487 .tlow_fast_fastplus_mode = 0x2,
1488 .thigh_fast_fastplus_mode = 0x2,
1489 .setup_hold_time_std_mode = 0x08080808,
1490 .setup_hold_time_fast_fast_plus_mode = 0x02020202,
1491 .setup_hold_time_hs_mode = 0x090909,
1492 .has_interface_timing_reg = true,
1495 /* Match table for of_platform binding */
1496 static const struct of_device_id tegra_i2c_of_match[] = {
1497 { .compatible = "nvidia,tegra194-i2c", .data = &tegra194_i2c_hw, },
1498 { .compatible = "nvidia,tegra186-i2c", .data = &tegra186_i2c_hw, },
1499 { .compatible = "nvidia,tegra210-i2c", .data = &tegra210_i2c_hw, },
1500 { .compatible = "nvidia,tegra124-i2c", .data = &tegra124_i2c_hw, },
1501 { .compatible = "nvidia,tegra114-i2c", .data = &tegra114_i2c_hw, },
1502 { .compatible = "nvidia,tegra30-i2c", .data = &tegra30_i2c_hw, },
1503 { .compatible = "nvidia,tegra20-i2c", .data = &tegra20_i2c_hw, },
1504 { .compatible = "nvidia,tegra20-i2c-dvc", .data = &tegra20_i2c_hw, },
1507 MODULE_DEVICE_TABLE(of, tegra_i2c_of_match);
1509 static int tegra_i2c_probe(struct platform_device *pdev)
1511 struct tegra_i2c_dev *i2c_dev;
1512 struct resource *res;
1513 struct clk *div_clk;
1514 struct clk *fast_clk;
1516 phys_addr_t base_phys;
1520 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1521 base_phys = res->start;
1522 base = devm_ioremap_resource(&pdev->dev, res);
1524 return PTR_ERR(base);
1526 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1528 dev_err(&pdev->dev, "no irq resource\n");
1533 div_clk = devm_clk_get(&pdev->dev, "div-clk");
1534 if (IS_ERR(div_clk)) {
1535 if (PTR_ERR(div_clk) != -EPROBE_DEFER)
1536 dev_err(&pdev->dev, "missing controller clock\n");
1538 return PTR_ERR(div_clk);
1541 i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
1545 i2c_dev->base = base;
1546 i2c_dev->base_phys = base_phys;
1547 i2c_dev->div_clk = div_clk;
1548 i2c_dev->adapter.algo = &tegra_i2c_algo;
1549 i2c_dev->adapter.retries = 1;
1550 i2c_dev->adapter.timeout = 6 * HZ;
1552 i2c_dev->cont_id = pdev->id;
1553 i2c_dev->dev = &pdev->dev;
1555 i2c_dev->rst = devm_reset_control_get_exclusive(&pdev->dev, "i2c");
1556 if (IS_ERR(i2c_dev->rst)) {
1557 dev_err(&pdev->dev, "missing controller reset\n");
1558 return PTR_ERR(i2c_dev->rst);
1561 tegra_i2c_parse_dt(i2c_dev);
1563 i2c_dev->hw = of_device_get_match_data(&pdev->dev);
1564 i2c_dev->is_dvc = of_device_is_compatible(pdev->dev.of_node,
1565 "nvidia,tegra20-i2c-dvc");
1566 i2c_dev->adapter.quirks = i2c_dev->hw->quirks;
1567 i2c_dev->dma_buf_size = i2c_dev->adapter.quirks->max_write_len +
1568 I2C_PACKET_HEADER_SIZE;
1569 init_completion(&i2c_dev->msg_complete);
1570 init_completion(&i2c_dev->dma_complete);
1571 spin_lock_init(&i2c_dev->xfer_lock);
1573 if (!i2c_dev->hw->has_single_clk_source) {
1574 fast_clk = devm_clk_get(&pdev->dev, "fast-clk");
1575 if (IS_ERR(fast_clk)) {
1576 dev_err(&pdev->dev, "missing fast clock\n");
1577 return PTR_ERR(fast_clk);
1579 i2c_dev->fast_clk = fast_clk;
1582 platform_set_drvdata(pdev, i2c_dev);
1584 if (!i2c_dev->hw->has_single_clk_source) {
1585 ret = clk_prepare(i2c_dev->fast_clk);
1587 dev_err(i2c_dev->dev, "Clock prepare failed %d\n", ret);
1592 if (i2c_dev->bus_clk_rate > I2C_FAST_MODE &&
1593 i2c_dev->bus_clk_rate <= I2C_FAST_PLUS_MODE)
1594 i2c_dev->clk_divisor_non_hs_mode =
1595 i2c_dev->hw->clk_divisor_fast_plus_mode;
1596 else if (i2c_dev->bus_clk_rate > I2C_STANDARD_MODE &&
1597 i2c_dev->bus_clk_rate <= I2C_FAST_MODE)
1598 i2c_dev->clk_divisor_non_hs_mode =
1599 i2c_dev->hw->clk_divisor_fast_mode;
1601 i2c_dev->clk_divisor_non_hs_mode =
1602 i2c_dev->hw->clk_divisor_std_mode;
1604 ret = clk_prepare(i2c_dev->div_clk);
1606 dev_err(i2c_dev->dev, "Clock prepare failed %d\n", ret);
1607 goto unprepare_fast_clk;
1610 pm_runtime_enable(&pdev->dev);
1611 if (!pm_runtime_enabled(&pdev->dev))
1612 ret = tegra_i2c_runtime_resume(&pdev->dev);
1614 ret = pm_runtime_get_sync(i2c_dev->dev);
1617 dev_err(&pdev->dev, "runtime resume failed\n");
1618 goto unprepare_div_clk;
1621 if (i2c_dev->is_multimaster_mode) {
1622 ret = clk_enable(i2c_dev->div_clk);
1624 dev_err(i2c_dev->dev, "div_clk enable failed %d\n",
1630 if (i2c_dev->hw->supports_bus_clear)
1631 i2c_dev->adapter.bus_recovery_info = &tegra_i2c_recovery_info;
1633 ret = tegra_i2c_init_dma(i2c_dev);
1635 goto disable_div_clk;
1637 ret = tegra_i2c_init(i2c_dev, false);
1639 dev_err(&pdev->dev, "Failed to initialize i2c controller\n");
1643 ret = devm_request_irq(&pdev->dev, i2c_dev->irq,
1644 tegra_i2c_isr, 0, dev_name(&pdev->dev), i2c_dev);
1646 dev_err(&pdev->dev, "Failed to request irq %i\n", i2c_dev->irq);
1650 i2c_set_adapdata(&i2c_dev->adapter, i2c_dev);
1651 i2c_dev->adapter.owner = THIS_MODULE;
1652 i2c_dev->adapter.class = I2C_CLASS_DEPRECATED;
1653 strlcpy(i2c_dev->adapter.name, dev_name(&pdev->dev),
1654 sizeof(i2c_dev->adapter.name));
1655 i2c_dev->adapter.dev.parent = &pdev->dev;
1656 i2c_dev->adapter.nr = pdev->id;
1657 i2c_dev->adapter.dev.of_node = pdev->dev.of_node;
1659 ret = i2c_add_numbered_adapter(&i2c_dev->adapter);
1663 pm_runtime_put(&pdev->dev);
1668 tegra_i2c_release_dma(i2c_dev);
1671 if (i2c_dev->is_multimaster_mode)
1672 clk_disable(i2c_dev->div_clk);
1675 pm_runtime_disable(&pdev->dev);
1676 if (!pm_runtime_status_suspended(&pdev->dev))
1677 tegra_i2c_runtime_suspend(&pdev->dev);
1680 clk_unprepare(i2c_dev->div_clk);
1683 if (!i2c_dev->hw->has_single_clk_source)
1684 clk_unprepare(i2c_dev->fast_clk);
1689 static int tegra_i2c_remove(struct platform_device *pdev)
1691 struct tegra_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
1693 i2c_del_adapter(&i2c_dev->adapter);
1695 if (i2c_dev->is_multimaster_mode)
1696 clk_disable(i2c_dev->div_clk);
1698 pm_runtime_disable(&pdev->dev);
1699 if (!pm_runtime_status_suspended(&pdev->dev))
1700 tegra_i2c_runtime_suspend(&pdev->dev);
1702 clk_unprepare(i2c_dev->div_clk);
1703 if (!i2c_dev->hw->has_single_clk_source)
1704 clk_unprepare(i2c_dev->fast_clk);
1706 tegra_i2c_release_dma(i2c_dev);
1710 #ifdef CONFIG_PM_SLEEP
1711 static int tegra_i2c_suspend(struct device *dev)
1713 struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
1715 i2c_mark_adapter_suspended(&i2c_dev->adapter);
1720 static int tegra_i2c_resume(struct device *dev)
1722 struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
1725 err = tegra_i2c_runtime_resume(dev);
1729 err = tegra_i2c_init(i2c_dev, false);
1733 err = tegra_i2c_runtime_suspend(dev);
1737 i2c_mark_adapter_resumed(&i2c_dev->adapter);
1742 static const struct dev_pm_ops tegra_i2c_pm = {
1743 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_i2c_suspend, tegra_i2c_resume)
1744 SET_RUNTIME_PM_OPS(tegra_i2c_runtime_suspend, tegra_i2c_runtime_resume,
1748 #define TEGRA_I2C_PM (&tegra_i2c_pm)
1750 #define TEGRA_I2C_PM NULL
1753 static struct platform_driver tegra_i2c_driver = {
1754 .probe = tegra_i2c_probe,
1755 .remove = tegra_i2c_remove,
1757 .name = "tegra-i2c",
1758 .of_match_table = tegra_i2c_of_match,
1763 module_platform_driver(tegra_i2c_driver);
1765 MODULE_DESCRIPTION("nVidia Tegra2 I2C Bus Controller driver");
1766 MODULE_AUTHOR("Colin Cross");
1767 MODULE_LICENSE("GPL v2");