Lines Matching +full:spi +full:- +full:clk
2 * Broadcom BCM63XX High Speed SPI Controller driver
4 * Copyright 2000-2010 Broadcom Corporation
5 * Copyright 2012-2013 Jonas Gorski <jogo@openwrt.org>
13 #include <linux/clk.h>
17 #include <linux/dma-mapping.h>
20 #include <linux/spi/spi.h>
98 #define HSSPI_BUS_NUM 1 /* 0 is legacy SPI */
105 struct clk *clk; member
106 struct clk *pll_clk;
119 mutex_lock(&bs->bus_mutex); in bcm63xx_hsspi_set_cs()
120 reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); in bcm63xx_hsspi_set_cs()
123 if (active == !(bs->cs_polarity & BIT(cs))) in bcm63xx_hsspi_set_cs()
126 __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); in bcm63xx_hsspi_set_cs()
127 mutex_unlock(&bs->bus_mutex); in bcm63xx_hsspi_set_cs()
131 struct spi_device *spi, int hz) in bcm63xx_hsspi_set_clk() argument
133 unsigned int profile = spi->chip_select; in bcm63xx_hsspi_set_clk()
136 reg = DIV_ROUND_UP(2048, DIV_ROUND_UP(bs->speed_hz, hz)); in bcm63xx_hsspi_set_clk()
138 bs->regs + HSSPI_PROFILE_CLK_CTRL_REG(profile)); in bcm63xx_hsspi_set_clk()
140 reg = __raw_readl(bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile)); in bcm63xx_hsspi_set_clk()
145 __raw_writel(reg, bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile)); in bcm63xx_hsspi_set_clk()
147 mutex_lock(&bs->bus_mutex); in bcm63xx_hsspi_set_clk()
149 reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); in bcm63xx_hsspi_set_clk()
151 if (spi->mode & SPI_CPOL) in bcm63xx_hsspi_set_clk()
153 __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); in bcm63xx_hsspi_set_clk()
154 mutex_unlock(&bs->bus_mutex); in bcm63xx_hsspi_set_clk()
157 static int bcm63xx_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t) in bcm63xx_hsspi_do_txrx() argument
159 struct bcm63xx_hsspi *bs = spi_master_get_devdata(spi->master); in bcm63xx_hsspi_do_txrx()
160 unsigned int chip_select = spi->chip_select; in bcm63xx_hsspi_do_txrx()
162 int pending = t->len; in bcm63xx_hsspi_do_txrx()
164 const u8 *tx = t->tx_buf; in bcm63xx_hsspi_do_txrx()
165 u8 *rx = t->rx_buf; in bcm63xx_hsspi_do_txrx()
168 bcm63xx_hsspi_set_clk(bs, spi, t->speed_hz); in bcm63xx_hsspi_do_txrx()
169 bcm63xx_hsspi_set_cs(bs, spi->chip_select, true); in bcm63xx_hsspi_do_txrx()
179 step_size -= HSSPI_OPCODE_LEN; in bcm63xx_hsspi_do_txrx()
181 if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) || in bcm63xx_hsspi_do_txrx()
182 (opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL)) { in bcm63xx_hsspi_do_txrx()
185 if (t->rx_nbits == SPI_NBITS_DUAL) in bcm63xx_hsspi_do_txrx()
187 if (t->tx_nbits == SPI_NBITS_DUAL) in bcm63xx_hsspi_do_txrx()
192 bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select)); in bcm63xx_hsspi_do_txrx()
197 reinit_completion(&bs->done); in bcm63xx_hsspi_do_txrx()
199 memcpy_toio(bs->fifo + HSSPI_OPCODE_LEN, tx, curr_step); in bcm63xx_hsspi_do_txrx()
203 __raw_writew(opcode | curr_step, bs->fifo); in bcm63xx_hsspi_do_txrx()
207 bs->regs + HSSPI_INT_MASK_REG); in bcm63xx_hsspi_do_txrx()
213 bs->regs + HSSPI_PINGPONG_COMMAND_REG(0)); in bcm63xx_hsspi_do_txrx()
215 if (wait_for_completion_timeout(&bs->done, HZ) == 0) { in bcm63xx_hsspi_do_txrx()
216 dev_err(&bs->pdev->dev, "transfer timed out!\n"); in bcm63xx_hsspi_do_txrx()
217 return -ETIMEDOUT; in bcm63xx_hsspi_do_txrx()
221 memcpy_fromio(rx, bs->fifo, curr_step); in bcm63xx_hsspi_do_txrx()
225 pending -= curr_step; in bcm63xx_hsspi_do_txrx()
231 static int bcm63xx_hsspi_setup(struct spi_device *spi) in bcm63xx_hsspi_setup() argument
233 struct bcm63xx_hsspi *bs = spi_master_get_devdata(spi->master); in bcm63xx_hsspi_setup()
236 reg = __raw_readl(bs->regs + in bcm63xx_hsspi_setup()
237 HSSPI_PROFILE_SIGNAL_CTRL_REG(spi->chip_select)); in bcm63xx_hsspi_setup()
239 if (spi->mode & SPI_CPHA) in bcm63xx_hsspi_setup()
243 __raw_writel(reg, bs->regs + in bcm63xx_hsspi_setup()
244 HSSPI_PROFILE_SIGNAL_CTRL_REG(spi->chip_select)); in bcm63xx_hsspi_setup()
246 mutex_lock(&bs->bus_mutex); in bcm63xx_hsspi_setup()
247 reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); in bcm63xx_hsspi_setup()
250 if ((reg & GLOBAL_CTRL_CS_POLARITY_MASK) == bs->cs_polarity) { in bcm63xx_hsspi_setup()
251 if (spi->mode & SPI_CS_HIGH) in bcm63xx_hsspi_setup()
252 reg |= BIT(spi->chip_select); in bcm63xx_hsspi_setup()
254 reg &= ~BIT(spi->chip_select); in bcm63xx_hsspi_setup()
255 __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); in bcm63xx_hsspi_setup()
258 if (spi->mode & SPI_CS_HIGH) in bcm63xx_hsspi_setup()
259 bs->cs_polarity |= BIT(spi->chip_select); in bcm63xx_hsspi_setup()
261 bs->cs_polarity &= ~BIT(spi->chip_select); in bcm63xx_hsspi_setup()
263 mutex_unlock(&bs->bus_mutex); in bcm63xx_hsspi_setup()
273 struct spi_device *spi = msg->spi; in bcm63xx_hsspi_transfer_one() local
274 int status = -EINVAL; in bcm63xx_hsspi_transfer_one()
286 * the multiplexed nature of SPI the actual target will receive in bcm63xx_hsspi_transfer_one()
292 dummy_cs = !spi->chip_select; in bcm63xx_hsspi_transfer_one()
295 list_for_each_entry(t, &msg->transfers, transfer_list) { in bcm63xx_hsspi_transfer_one()
296 status = bcm63xx_hsspi_do_txrx(spi, t); in bcm63xx_hsspi_transfer_one()
300 msg->actual_length += t->len; in bcm63xx_hsspi_transfer_one()
304 if (t->cs_change) in bcm63xx_hsspi_transfer_one()
305 bcm63xx_hsspi_set_cs(bs, spi->chip_select, false); in bcm63xx_hsspi_transfer_one()
308 mutex_lock(&bs->bus_mutex); in bcm63xx_hsspi_transfer_one()
309 reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); in bcm63xx_hsspi_transfer_one()
311 reg |= bs->cs_polarity; in bcm63xx_hsspi_transfer_one()
312 __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); in bcm63xx_hsspi_transfer_one()
313 mutex_unlock(&bs->bus_mutex); in bcm63xx_hsspi_transfer_one()
315 msg->status = status; in bcm63xx_hsspi_transfer_one()
325 if (__raw_readl(bs->regs + HSSPI_INT_STATUS_MASKED_REG) == 0) in bcm63xx_hsspi_interrupt()
328 __raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG); in bcm63xx_hsspi_interrupt()
329 __raw_writel(0, bs->regs + HSSPI_INT_MASK_REG); in bcm63xx_hsspi_interrupt()
331 complete(&bs->done); in bcm63xx_hsspi_interrupt()
341 struct device *dev = &pdev->dev; in bcm63xx_hsspi_probe()
342 struct clk *clk, *pll_clk = NULL; in bcm63xx_hsspi_probe() local
355 clk = devm_clk_get(dev, "hsspi"); in bcm63xx_hsspi_probe()
357 if (IS_ERR(clk)) in bcm63xx_hsspi_probe()
358 return PTR_ERR(clk); in bcm63xx_hsspi_probe()
364 ret = clk_prepare_enable(clk); in bcm63xx_hsspi_probe()
374 rate = clk_get_rate(clk); in bcm63xx_hsspi_probe()
389 ret = -EINVAL; in bcm63xx_hsspi_probe()
394 master = spi_alloc_master(&pdev->dev, sizeof(*bs)); in bcm63xx_hsspi_probe()
396 ret = -ENOMEM; in bcm63xx_hsspi_probe()
401 bs->pdev = pdev; in bcm63xx_hsspi_probe()
402 bs->clk = clk; in bcm63xx_hsspi_probe()
403 bs->pll_clk = pll_clk; in bcm63xx_hsspi_probe()
404 bs->regs = regs; in bcm63xx_hsspi_probe()
405 bs->speed_hz = rate; in bcm63xx_hsspi_probe()
406 bs->fifo = (u8 __iomem *)(bs->regs + HSSPI_FIFO_REG(0)); in bcm63xx_hsspi_probe()
408 mutex_init(&bs->bus_mutex); in bcm63xx_hsspi_probe()
409 init_completion(&bs->done); in bcm63xx_hsspi_probe()
411 master->dev.of_node = dev->of_node; in bcm63xx_hsspi_probe()
412 if (!dev->of_node) in bcm63xx_hsspi_probe()
413 master->bus_num = HSSPI_BUS_NUM; in bcm63xx_hsspi_probe()
415 of_property_read_u32(dev->of_node, "num-cs", &num_cs); in bcm63xx_hsspi_probe()
421 master->num_chipselect = num_cs; in bcm63xx_hsspi_probe()
422 master->setup = bcm63xx_hsspi_setup; in bcm63xx_hsspi_probe()
423 master->transfer_one_message = bcm63xx_hsspi_transfer_one; in bcm63xx_hsspi_probe()
424 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | in bcm63xx_hsspi_probe()
426 master->bits_per_word_mask = SPI_BPW_MASK(8); in bcm63xx_hsspi_probe()
427 master->auto_runtime_pm = true; in bcm63xx_hsspi_probe()
432 __raw_writel(0, bs->regs + HSSPI_INT_MASK_REG); in bcm63xx_hsspi_probe()
435 __raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG); in bcm63xx_hsspi_probe()
438 reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); in bcm63xx_hsspi_probe()
439 bs->cs_polarity = reg & GLOBAL_CTRL_CS_POLARITY_MASK; in bcm63xx_hsspi_probe()
441 bs->regs + HSSPI_GLOBAL_CTRL_REG); in bcm63xx_hsspi_probe()
444 pdev->name, bs); in bcm63xx_hsspi_probe()
449 pm_runtime_enable(&pdev->dev); in bcm63xx_hsspi_probe()
459 pm_runtime_disable(&pdev->dev); in bcm63xx_hsspi_probe()
465 clk_disable_unprepare(clk); in bcm63xx_hsspi_probe()
476 __raw_writel(0, bs->regs + HSSPI_INT_MASK_REG); in bcm63xx_hsspi_remove()
477 clk_disable_unprepare(bs->pll_clk); in bcm63xx_hsspi_remove()
478 clk_disable_unprepare(bs->clk); in bcm63xx_hsspi_remove()
490 clk_disable_unprepare(bs->pll_clk); in bcm63xx_hsspi_suspend()
491 clk_disable_unprepare(bs->clk); in bcm63xx_hsspi_suspend()
502 ret = clk_prepare_enable(bs->clk); in bcm63xx_hsspi_resume()
506 if (bs->pll_clk) { in bcm63xx_hsspi_resume()
507 ret = clk_prepare_enable(bs->pll_clk); in bcm63xx_hsspi_resume()
509 clk_disable_unprepare(bs->clk); in bcm63xx_hsspi_resume()
524 { .compatible = "brcm,bcm6328-hsspi", },
531 .name = "bcm63xx-hsspi",
542 MODULE_DESCRIPTION("Broadcom BCM63xx High Speed SPI Controller driver");