1 // SPDX-License-Identifier: GPL-2.0-or-later
5  *  Copyright (C) 2012-2016 Alexander Shiyan <shc_work@mail.ru>
9 #include <linux/clk.h>
16 #include <linux/mfd/syscon.h>
17 #include <linux/mfd/syscon/clps711x.h>
20 #define DRIVER_NAME		"clps711x-spi"
27 	struct regmap		*syscon;  member
28 	struct clk		*spi_clk;
40 	struct spi_device *spi = msg->spi;  in spi_clps711x_prepare_message()
43 	return regmap_update_bits(hw->syscon, SYSCON_OFFSET, SYSCON3_ADCCKNSEN,  in spi_clps711x_prepare_message()
44 				  (spi->mode & SPI_CPHA) ?  in spi_clps711x_prepare_message()
55 	clk_set_rate(hw->spi_clk, xfer->speed_hz ? : spi->max_speed_hz);  in spi_clps711x_transfer_one()
57 	hw->len = xfer->len;  in spi_clps711x_transfer_one()
58 	hw->bpw = xfer->bits_per_word;  in spi_clps711x_transfer_one()
59 	hw->tx_buf = (u8 *)xfer->tx_buf;  in spi_clps711x_transfer_one()
60 	hw->rx_buf = (u8 *)xfer->rx_buf;  in spi_clps711x_transfer_one()
63 	data = hw->tx_buf ? *hw->tx_buf++ : 0;  in spi_clps711x_transfer_one()
64 	writel(data | SYNCIO_FRMLEN(hw->bpw) | SYNCIO_TXFRMEN, hw->syncio);  in spi_clps711x_transfer_one()
76 	data = readb(hw->syncio);  in spi_clps711x_isr()
77 	if (hw->rx_buf)  in spi_clps711x_isr()
78 		*hw->rx_buf++ = data;  in spi_clps711x_isr()
81 	if (--hw->len > 0) {  in spi_clps711x_isr()
82 		data = hw->tx_buf ? *hw->tx_buf++ : 0;  in spi_clps711x_isr()
83 		writel(data | SYNCIO_FRMLEN(hw->bpw) | SYNCIO_TXFRMEN,  in spi_clps711x_isr()
84 		       hw->syncio);  in spi_clps711x_isr()
93 	struct device_node *np = pdev->dev.of_node;  in spi_clps711x_probe()
102 	host = spi_alloc_host(&pdev->dev, sizeof(*hw));  in spi_clps711x_probe()
104 		return -ENOMEM;  in spi_clps711x_probe()
106 	host->use_gpio_descriptors = true;  in spi_clps711x_probe()
107 	host->bus_num = -1;  in spi_clps711x_probe()
108 	host->mode_bits = SPI_CPHA | SPI_CS_HIGH;  in spi_clps711x_probe()
109 	host->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 8);  in spi_clps711x_probe()
110 	host->dev.of_node = pdev->dev.of_node;  in spi_clps711x_probe()
111 	host->prepare_message = spi_clps711x_prepare_message;  in spi_clps711x_probe()
112 	host->transfer_one = spi_clps711x_transfer_one;  in spi_clps711x_probe()
116 	hw->spi_clk = devm_clk_get(&pdev->dev, NULL);  in spi_clps711x_probe()
117 	if (IS_ERR(hw->spi_clk)) {  in spi_clps711x_probe()
118 		ret = PTR_ERR(hw->spi_clk);  in spi_clps711x_probe()
122 	hw->syscon = syscon_regmap_lookup_by_phandle(np, "syscon");  in spi_clps711x_probe()
123 	if (IS_ERR(hw->syscon)) {  in spi_clps711x_probe()
124 		ret = PTR_ERR(hw->syscon);  in spi_clps711x_probe()
128 	hw->syncio = devm_platform_ioremap_resource(pdev, 0);  in spi_clps711x_probe()
129 	if (IS_ERR(hw->syncio)) {  in spi_clps711x_probe()
130 		ret = PTR_ERR(hw->syncio);  in spi_clps711x_probe()
135 	regmap_update_bits(hw->syscon, SYSCON_OFFSET, SYSCON3_ADCCON, 0);  in spi_clps711x_probe()
138 	readl(hw->syncio);  in spi_clps711x_probe()
140 	ret = devm_request_irq(&pdev->dev, irq, spi_clps711x_isr, 0,  in spi_clps711x_probe()
141 			       dev_name(&pdev->dev), host);  in spi_clps711x_probe()
145 	ret = devm_spi_register_controller(&pdev->dev, host);  in spi_clps711x_probe()
156 	{ .compatible = "cirrus,ep7209-spi", },