Lines Matching +full:num +full:- +full:transfer +full:- +full:bits
1 // SPDX-License-Identifier: GPL-2.0-only
69 * struct meson_i2c - Meson I2C device private data
77 * @last: Flag set for the last message in the transfer
78 * @count: Number of bytes to be sent/received in current transfer
82 * @done: Completion used to wait for transfer termination
117 data = readl(i2c->regs + reg); in meson_i2c_set_mask()
120 writel(data, i2c->regs + reg); in meson_i2c_set_mask()
125 i2c->tokens[0] = 0; in meson_i2c_reset_tokens()
126 i2c->tokens[1] = 0; in meson_i2c_reset_tokens()
127 i2c->num_tokens = 0; in meson_i2c_reset_tokens()
132 if (i2c->num_tokens < 8) in meson_i2c_add_token()
133 i2c->tokens[0] |= (token & 0xf) << (i2c->num_tokens * 4); in meson_i2c_add_token()
135 i2c->tokens[1] |= (token & 0xf) << ((i2c->num_tokens % 8) * 4); in meson_i2c_add_token()
137 i2c->num_tokens++; in meson_i2c_add_token()
142 unsigned long clk_rate = clk_get_rate(i2c->clk); in meson_gxbb_axg_i2c_set_clk_div()
145 /* According to I2C-BUS Spec 2.1, in FAST-MODE, the minimum LOW period is 1.3uS, and in meson_gxbb_axg_i2c_set_clk_div()
149 * The same applies for Fast-mode plus, where LOW is 0.5us and HIGH is 0.26us. in meson_gxbb_axg_i2c_set_clk_div()
155 div_h = DIV_ROUND_UP(div_h, 2) - FILTER_DELAY; in meson_gxbb_axg_i2c_set_clk_div()
157 div_h = DIV_ROUND_UP(clk_rate * 2, freq * 5) - FILTER_DELAY; in meson_gxbb_axg_i2c_set_clk_div()
161 /* clock divider has 12 bits */ in meson_gxbb_axg_i2c_set_clk_div()
163 dev_err(i2c->dev, "requested bus frequency too low\n"); in meson_gxbb_axg_i2c_set_clk_div()
167 dev_err(i2c->dev, "requested bus frequency too low\n"); in meson_gxbb_axg_i2c_set_clk_div()
184 dev_dbg(i2c->dev, "%s: clk %lu, freq %u, divh %u, divl %u\n", __func__, in meson_gxbb_axg_i2c_set_clk_div()
190 unsigned long clk_rate = clk_get_rate(i2c->clk); in meson6_i2c_set_clk_div()
194 div -= FILTER_DELAY; in meson6_i2c_set_clk_div()
197 /* clock divider has 12 bits */ in meson6_i2c_set_clk_div()
199 dev_err(i2c->dev, "requested bus frequency too low\n"); in meson6_i2c_set_clk_div()
212 dev_dbg(i2c->dev, "%s: clk %lu, freq %u, div %u\n", __func__, in meson6_i2c_set_clk_div()
221 rdata0 = readl(i2c->regs + REG_TOK_RDATA0); in meson_i2c_get_data()
222 rdata1 = readl(i2c->regs + REG_TOK_RDATA1); in meson_i2c_get_data()
224 dev_dbg(i2c->dev, "%s: data %08x %08x len %d\n", __func__, in meson_i2c_get_data()
231 *buf++ = (rdata1 >> (i - 4) * 8) & 0xff; in meson_i2c_get_data()
243 wdata1 |= *buf++ << ((i - 4) * 8); in meson_i2c_put_data()
245 writel(wdata0, i2c->regs + REG_TOK_WDATA0); in meson_i2c_put_data()
246 writel(wdata1, i2c->regs + REG_TOK_WDATA1); in meson_i2c_put_data()
248 dev_dbg(i2c->dev, "%s: data %08x %08x len %d\n", __func__, in meson_i2c_put_data()
254 bool write = !(i2c->msg->flags & I2C_M_RD); in meson_i2c_prepare_xfer()
257 i2c->count = min(i2c->msg->len - i2c->pos, 8); in meson_i2c_prepare_xfer()
259 for (i = 0; i < i2c->count - 1; i++) in meson_i2c_prepare_xfer()
262 if (i2c->count) { in meson_i2c_prepare_xfer()
263 if (write || i2c->pos + i2c->count < i2c->msg->len) in meson_i2c_prepare_xfer()
270 meson_i2c_put_data(i2c, i2c->msg->buf + i2c->pos, i2c->count); in meson_i2c_prepare_xfer()
272 if (i2c->last && i2c->pos + i2c->count >= i2c->msg->len) in meson_i2c_prepare_xfer()
275 writel(i2c->tokens[0], i2c->regs + REG_TOK_LIST0); in meson_i2c_prepare_xfer()
276 writel(i2c->tokens[1], i2c->regs + REG_TOK_LIST1); in meson_i2c_prepare_xfer()
288 dev_dbg(i2c->dev, "error bit set\n"); in meson_i2c_transfer_complete()
289 i2c->error = -ENXIO; in meson_i2c_transfer_complete()
290 i2c->state = STATE_IDLE; in meson_i2c_transfer_complete()
292 if (i2c->state == STATE_READ && i2c->count) in meson_i2c_transfer_complete()
293 meson_i2c_get_data(i2c, i2c->msg->buf + i2c->pos, in meson_i2c_transfer_complete()
294 i2c->count); in meson_i2c_transfer_complete()
296 i2c->pos += i2c->count; in meson_i2c_transfer_complete()
298 if (i2c->pos >= i2c->msg->len) in meson_i2c_transfer_complete()
299 i2c->state = STATE_IDLE; in meson_i2c_transfer_complete()
308 spin_lock(&i2c->lock); in meson_i2c_irq()
312 ctrl = readl(i2c->regs + REG_CTRL); in meson_i2c_irq()
314 dev_dbg(i2c->dev, "irq: state %d, pos %d, count %d, ctrl %08x\n", in meson_i2c_irq()
315 i2c->state, i2c->pos, i2c->count, ctrl); in meson_i2c_irq()
317 if (i2c->state == STATE_IDLE) { in meson_i2c_irq()
318 spin_unlock(&i2c->lock); in meson_i2c_irq()
324 if (i2c->state == STATE_IDLE) { in meson_i2c_irq()
325 complete(&i2c->done); in meson_i2c_irq()
333 spin_unlock(&i2c->lock); in meson_i2c_irq()
342 token = (msg->flags & I2C_M_RD) ? TOKEN_SLAVE_ADDR_READ : in meson_i2c_do_start()
347 FIELD_PREP(REG_SLV_ADDR_MASK, msg->addr << 1)); in meson_i2c_do_start()
360 i2c->msg = msg; in meson_i2c_xfer_msg()
361 i2c->last = last; in meson_i2c_xfer_msg()
362 i2c->pos = 0; in meson_i2c_xfer_msg()
363 i2c->count = 0; in meson_i2c_xfer_msg()
364 i2c->error = 0; in meson_i2c_xfer_msg()
368 flags = (msg->flags & I2C_M_IGNORE_NAK) ? REG_CTRL_ACK_IGNORE : 0; in meson_i2c_xfer_msg()
371 if (!(msg->flags & I2C_M_NOSTART)) in meson_i2c_xfer_msg()
374 i2c->state = (msg->flags & I2C_M_RD) ? STATE_READ : STATE_WRITE; in meson_i2c_xfer_msg()
378 reinit_completion(&i2c->done); in meson_i2c_xfer_msg()
380 /* Start the transfer */ in meson_i2c_xfer_msg()
384 ret = readl_poll_timeout_atomic(i2c->regs + REG_CTRL, ctrl, in meson_i2c_xfer_msg()
389 time_left = wait_for_completion_timeout(&i2c->done, time_left); in meson_i2c_xfer_msg()
392 ret = -ETIMEDOUT; in meson_i2c_xfer_msg()
397 * handlers triggered by a transfer terminated after the in meson_i2c_xfer_msg()
400 spin_lock_irqsave(&i2c->lock, flags); in meson_i2c_xfer_msg()
409 i2c->state = STATE_IDLE; in meson_i2c_xfer_msg()
411 if (i2c->error) in meson_i2c_xfer_msg()
412 ret = i2c->error; in meson_i2c_xfer_msg()
414 spin_unlock_irqrestore(&i2c->lock, flags); in meson_i2c_xfer_msg()
420 struct i2c_msg *msgs, int num, bool atomic) in meson_i2c_xfer_messages() argument
422 struct meson_i2c *i2c = adap->algo_data; in meson_i2c_xfer_messages()
425 for (i = 0; i < num; i++) { in meson_i2c_xfer_messages()
426 ret = meson_i2c_xfer_msg(i2c, msgs + i, i == num - 1, atomic); in meson_i2c_xfer_messages()
435 int num) in meson_i2c_xfer() argument
437 return meson_i2c_xfer_messages(adap, msgs, num, false); in meson_i2c_xfer()
441 struct i2c_msg *msgs, int num) in meson_i2c_xfer_atomic() argument
443 return meson_i2c_xfer_messages(adap, msgs, num, true); in meson_i2c_xfer_atomic()
459 struct device_node *np = pdev->dev.of_node; in meson_i2c_probe()
464 i2c = devm_kzalloc(&pdev->dev, sizeof(struct meson_i2c), GFP_KERNEL); in meson_i2c_probe()
466 return -ENOMEM; in meson_i2c_probe()
468 i2c_parse_fw_timings(&pdev->dev, &timings, true); in meson_i2c_probe()
470 i2c->dev = &pdev->dev; in meson_i2c_probe()
473 spin_lock_init(&i2c->lock); in meson_i2c_probe()
474 init_completion(&i2c->done); in meson_i2c_probe()
476 i2c->data = (const struct meson_i2c_data *) in meson_i2c_probe()
477 of_device_get_match_data(&pdev->dev); in meson_i2c_probe()
479 i2c->clk = devm_clk_get(&pdev->dev, NULL); in meson_i2c_probe()
480 if (IS_ERR(i2c->clk)) { in meson_i2c_probe()
481 dev_err(&pdev->dev, "can't get device clock\n"); in meson_i2c_probe()
482 return PTR_ERR(i2c->clk); in meson_i2c_probe()
485 i2c->regs = devm_platform_ioremap_resource(pdev, 0); in meson_i2c_probe()
486 if (IS_ERR(i2c->regs)) in meson_i2c_probe()
487 return PTR_ERR(i2c->regs); in meson_i2c_probe()
493 ret = devm_request_irq(&pdev->dev, irq, meson_i2c_irq, 0, NULL, i2c); in meson_i2c_probe()
495 dev_err(&pdev->dev, "can't request IRQ\n"); in meson_i2c_probe()
499 ret = clk_prepare_enable(i2c->clk); in meson_i2c_probe()
501 dev_err(&pdev->dev, "can't prepare clock\n"); in meson_i2c_probe()
505 strscpy(i2c->adap.name, "Meson I2C adapter", in meson_i2c_probe()
506 sizeof(i2c->adap.name)); in meson_i2c_probe()
507 i2c->adap.owner = THIS_MODULE; in meson_i2c_probe()
508 i2c->adap.algo = &meson_i2c_algorithm; in meson_i2c_probe()
509 i2c->adap.dev.parent = &pdev->dev; in meson_i2c_probe()
510 i2c->adap.dev.of_node = np; in meson_i2c_probe()
511 i2c->adap.algo_data = i2c; in meson_i2c_probe()
514 * A transfer is triggered when START bit changes from 0 to 1. in meson_i2c_probe()
523 if (!i2c->data->set_clk_div) { in meson_i2c_probe()
524 clk_disable_unprepare(i2c->clk); in meson_i2c_probe()
525 return -EINVAL; in meson_i2c_probe()
527 i2c->data->set_clk_div(i2c, timings.bus_freq_hz); in meson_i2c_probe()
529 ret = i2c_add_adapter(&i2c->adap); in meson_i2c_probe()
531 clk_disable_unprepare(i2c->clk); in meson_i2c_probe()
542 i2c_del_adapter(&i2c->adap); in meson_i2c_remove()
543 clk_disable_unprepare(i2c->clk); in meson_i2c_remove()
561 { .compatible = "amlogic,meson6-i2c", .data = &i2c_meson6_data },
562 { .compatible = "amlogic,meson-gxbb-i2c", .data = &i2c_gxbb_data },
563 { .compatible = "amlogic,meson-axg-i2c", .data = &i2c_axg_data },
573 .name = "meson-i2c",