.. | .. |
---|
| 1 | +// SPDX-License-Identifier: GPL-2.0-only |
---|
1 | 2 | /* |
---|
2 | 3 | * SPI-Engine SPI controller driver |
---|
3 | 4 | * Copyright 2015 Analog Devices Inc. |
---|
4 | 5 | * Author: Lars-Peter Clausen <lars@metafoo.de> |
---|
5 | | - * |
---|
6 | | - * Licensed under the GPL-2. |
---|
7 | 6 | */ |
---|
8 | 7 | |
---|
9 | 8 | #include <linux/clk.h> |
---|
.. | .. |
---|
164 | 163 | } |
---|
165 | 164 | |
---|
166 | 165 | static void spi_engine_gen_sleep(struct spi_engine_program *p, bool dry, |
---|
167 | | - struct spi_engine *spi_engine, unsigned int clk_div, unsigned int delay) |
---|
| 166 | + struct spi_engine *spi_engine, unsigned int clk_div, |
---|
| 167 | + struct spi_transfer *xfer) |
---|
168 | 168 | { |
---|
169 | 169 | unsigned int spi_clk = clk_get_rate(spi_engine->ref_clk); |
---|
170 | 170 | unsigned int t; |
---|
| 171 | + int delay; |
---|
| 172 | + |
---|
| 173 | + if (xfer->delay_usecs) { |
---|
| 174 | + delay = xfer->delay_usecs; |
---|
| 175 | + } else { |
---|
| 176 | + delay = spi_delay_to_ns(&xfer->delay, xfer); |
---|
| 177 | + if (delay < 0) |
---|
| 178 | + return; |
---|
| 179 | + delay /= 1000; |
---|
| 180 | + } |
---|
171 | 181 | |
---|
172 | 182 | if (delay == 0) |
---|
173 | 183 | return; |
---|
.. | .. |
---|
219 | 229 | spi_engine_gen_cs(p, dry, spi, true); |
---|
220 | 230 | |
---|
221 | 231 | spi_engine_gen_xfer(p, dry, xfer); |
---|
222 | | - spi_engine_gen_sleep(p, dry, spi_engine, clk_div, |
---|
223 | | - xfer->delay_usecs); |
---|
| 232 | + spi_engine_gen_sleep(p, dry, spi_engine, clk_div, xfer); |
---|
224 | 233 | |
---|
225 | 234 | cs_change = xfer->cs_change; |
---|
226 | 235 | if (list_is_last(&xfer->transfer_list, &msg->transfers)) |
---|
.. | .. |
---|
461 | 470 | struct spi_engine *spi_engine; |
---|
462 | 471 | struct spi_master *master; |
---|
463 | 472 | unsigned int version; |
---|
464 | | - struct resource *res; |
---|
465 | 473 | int irq; |
---|
466 | 474 | int ret; |
---|
467 | 475 | |
---|
.. | .. |
---|
480 | 488 | spi_master_set_devdata(master, spi_engine); |
---|
481 | 489 | |
---|
482 | 490 | spin_lock_init(&spi_engine->lock); |
---|
483 | | - |
---|
484 | | - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
---|
485 | | - spi_engine->base = devm_ioremap_resource(&pdev->dev, res); |
---|
486 | | - if (IS_ERR(spi_engine->base)) { |
---|
487 | | - ret = PTR_ERR(spi_engine->base); |
---|
488 | | - goto err_put_master; |
---|
489 | | - } |
---|
490 | | - |
---|
491 | | - version = readl(spi_engine->base + SPI_ENGINE_REG_VERSION); |
---|
492 | | - if (SPI_ENGINE_VERSION_MAJOR(version) != 1) { |
---|
493 | | - dev_err(&pdev->dev, "Unsupported peripheral version %u.%u.%c\n", |
---|
494 | | - SPI_ENGINE_VERSION_MAJOR(version), |
---|
495 | | - SPI_ENGINE_VERSION_MINOR(version), |
---|
496 | | - SPI_ENGINE_VERSION_PATCH(version)); |
---|
497 | | - ret = -ENODEV; |
---|
498 | | - goto err_put_master; |
---|
499 | | - } |
---|
500 | 491 | |
---|
501 | 492 | spi_engine->clk = devm_clk_get(&pdev->dev, "s_axi_aclk"); |
---|
502 | 493 | if (IS_ERR(spi_engine->clk)) { |
---|
.. | .. |
---|
518 | 509 | if (ret) |
---|
519 | 510 | goto err_clk_disable; |
---|
520 | 511 | |
---|
| 512 | + spi_engine->base = devm_platform_ioremap_resource(pdev, 0); |
---|
| 513 | + if (IS_ERR(spi_engine->base)) { |
---|
| 514 | + ret = PTR_ERR(spi_engine->base); |
---|
| 515 | + goto err_ref_clk_disable; |
---|
| 516 | + } |
---|
| 517 | + |
---|
| 518 | + version = readl(spi_engine->base + SPI_ENGINE_REG_VERSION); |
---|
| 519 | + if (SPI_ENGINE_VERSION_MAJOR(version) != 1) { |
---|
| 520 | + dev_err(&pdev->dev, "Unsupported peripheral version %u.%u.%c\n", |
---|
| 521 | + SPI_ENGINE_VERSION_MAJOR(version), |
---|
| 522 | + SPI_ENGINE_VERSION_MINOR(version), |
---|
| 523 | + SPI_ENGINE_VERSION_PATCH(version)); |
---|
| 524 | + ret = -ENODEV; |
---|
| 525 | + goto err_ref_clk_disable; |
---|
| 526 | + } |
---|
| 527 | + |
---|
521 | 528 | writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_RESET); |
---|
522 | 529 | writel_relaxed(0xff, spi_engine->base + SPI_ENGINE_REG_INT_PENDING); |
---|
523 | 530 | writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_INT_ENABLE); |
---|