1 // SPDX-License-Identifier: GPL-2.0
3 // DFL bus driver for Altera SPI Master
19 #include <linux/io-64-nonatomic-lo-hi.h>
21 #include <linux/spi/spi.h>
22 #include <linux/spi/altera.h>
52 	void __iomem *base = context;  in indirect_bus_reg_read()  local
56 	writeq((reg >> 2) | INDIRECT_RD, base + INDIRECT_ADDR);  in indirect_bus_reg_read()
59 	while ((readq(base + INDIRECT_ADDR) & INDIRECT_RD) &&  in indirect_bus_reg_read()
65 		return -ETIME;  in indirect_bus_reg_read()
68 	v = readq(base + INDIRECT_RD_DATA);  in indirect_bus_reg_read()
78 	void __iomem *base = context;  in indirect_bus_reg_write()  local
81 	writeq(val, base + INDIRECT_WR_DATA);  in indirect_bus_reg_write()
82 	writeq((reg >> 2) | INDIRECT_WR, base + INDIRECT_ADDR);  in indirect_bus_reg_write()
85 	while ((readq(base + INDIRECT_ADDR) & INDIRECT_WR) &&  in indirect_bus_reg_write()
91 		return -ETIME;  in indirect_bus_reg_write()
107 static void config_spi_host(void __iomem *base, struct spi_controller *host)  in config_spi_host()  argument
111 	v = readq(base + SPI_CORE_PARAMETER);  in config_spi_host()
113 	host->mode_bits = SPI_CS_HIGH;  in config_spi_host()
115 		host->mode_bits |= SPI_CPOL;  in config_spi_host()
117 		host->mode_bits |= SPI_CPHA;  in config_spi_host()
119 	host->num_chipselect = FIELD_GET(NUM_CHIPSELECT, v);  in config_spi_host()
120 	host->bits_per_word_mask =  in config_spi_host()
127 	struct device *dev = &dfl_dev->dev;  in dfl_spi_altera_probe()
130 	void __iomem *base;  in dfl_spi_altera_probe()  local
135 		return -ENOMEM;  in dfl_spi_altera_probe()
137 	host->bus_num = -1;  in dfl_spi_altera_probe()
141 	hw->dev = dev;  in dfl_spi_altera_probe()
143 	base = devm_ioremap_resource(dev, &dfl_dev->mmio_res);  in dfl_spi_altera_probe()
145 	if (IS_ERR(base))  in dfl_spi_altera_probe()
146 		return PTR_ERR(base);  in dfl_spi_altera_probe()
148 	config_spi_host(base, host);  in dfl_spi_altera_probe()
150 		host->num_chipselect, host->bits_per_word_mask,  in dfl_spi_altera_probe()
151 		host->mode_bits);  in dfl_spi_altera_probe()
153 	hw->regmap = devm_regmap_init(dev, NULL, base, &indirect_regbus_cfg);  in dfl_spi_altera_probe()
154 	if (IS_ERR(hw->regmap))  in dfl_spi_altera_probe()
155 		return PTR_ERR(hw->regmap);  in dfl_spi_altera_probe()
157 	hw->irq = -EINVAL;  in dfl_spi_altera_probe()
163 		return dev_err_probe(dev, err, "%s failed to register spi host\n",  in dfl_spi_altera_probe()
166 	if (dfl_dev->revision == FME_FEATURE_REV_MAX10_SPI_N5010)  in dfl_spi_altera_probe()
167 		strscpy(board_info.modalias, "m10-n5010", SPI_NAME_SIZE);  in dfl_spi_altera_probe()
169 		strscpy(board_info.modalias, "m10-d5005", SPI_NAME_SIZE);  in dfl_spi_altera_probe()
176 		dev_err(dev, "%s failed to create SPI device: %s\n",  in dfl_spi_altera_probe()
190 		.name       = "dfl-spi-altera",
199 MODULE_DESCRIPTION("DFL spi altera driver");