^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * CLPS711X SPI bus driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2012-2016 Alexander Shiyan <shc_work@mail.ru>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mfd/syscon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/mfd/syscon/clps711x.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/spi/spi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define DRIVER_NAME "clps711x-spi"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define SYNCIO_FRMLEN(x) ((x) << 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define SYNCIO_TXFRMEN (1 << 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct spi_clps711x_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) void __iomem *syncio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct regmap *syscon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct clk *spi_clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) u8 *tx_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) u8 *rx_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) unsigned int bpw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static int spi_clps711x_prepare_message(struct spi_master *master,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct spi_message *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct spi_clps711x_data *hw = spi_master_get_devdata(master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct spi_device *spi = msg->spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /* Setup mode for transfer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return regmap_update_bits(hw->syscon, SYSCON_OFFSET, SYSCON3_ADCCKNSEN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) (spi->mode & SPI_CPHA) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) SYSCON3_ADCCKNSEN : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static int spi_clps711x_transfer_one(struct spi_master *master,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct spi_device *spi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct spi_transfer *xfer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct spi_clps711x_data *hw = spi_master_get_devdata(master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) clk_set_rate(hw->spi_clk, xfer->speed_hz ? : spi->max_speed_hz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) hw->len = xfer->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) hw->bpw = xfer->bits_per_word;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) hw->tx_buf = (u8 *)xfer->tx_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) hw->rx_buf = (u8 *)xfer->rx_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /* Initiate transfer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) data = hw->tx_buf ? *hw->tx_buf++ : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) writel(data | SYNCIO_FRMLEN(hw->bpw) | SYNCIO_TXFRMEN, hw->syncio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static irqreturn_t spi_clps711x_isr(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct spi_master *master = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct spi_clps711x_data *hw = spi_master_get_devdata(master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /* Handle RX */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) data = readb(hw->syncio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (hw->rx_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) *hw->rx_buf++ = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /* Handle TX */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (--hw->len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) data = hw->tx_buf ? *hw->tx_buf++ : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) writel(data | SYNCIO_FRMLEN(hw->bpw) | SYNCIO_TXFRMEN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) hw->syncio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) spi_finalize_current_transfer(master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static int spi_clps711x_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct spi_clps711x_data *hw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct spi_master *master;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) int irq, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) irq = platform_get_irq(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (irq < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) master = spi_alloc_master(&pdev->dev, sizeof(*hw));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (!master)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) master->use_gpio_descriptors = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) master->bus_num = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) master->mode_bits = SPI_CPHA | SPI_CS_HIGH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) master->dev.of_node = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) master->prepare_message = spi_clps711x_prepare_message;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) master->transfer_one = spi_clps711x_transfer_one;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) hw = spi_master_get_devdata(master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) hw->spi_clk = devm_clk_get(&pdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (IS_ERR(hw->spi_clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) ret = PTR_ERR(hw->spi_clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) hw->syscon =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) syscon_regmap_lookup_by_compatible("cirrus,ep7209-syscon3");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (IS_ERR(hw->syscon)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) ret = PTR_ERR(hw->syscon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) hw->syncio = devm_platform_ioremap_resource(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (IS_ERR(hw->syncio)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) ret = PTR_ERR(hw->syncio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /* Disable extended mode due hardware problems */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) regmap_update_bits(hw->syscon, SYSCON_OFFSET, SYSCON3_ADCCON, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /* Clear possible pending interrupt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) readl(hw->syncio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ret = devm_request_irq(&pdev->dev, irq, spi_clps711x_isr, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) dev_name(&pdev->dev), master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) ret = devm_spi_register_master(&pdev->dev, master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) err_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) spi_master_put(master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static const struct of_device_id clps711x_spi_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) { .compatible = "cirrus,ep7209-spi", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) MODULE_DEVICE_TABLE(of, clps711x_spi_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static struct platform_driver clps711x_spi_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .name = DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) .of_match_table = clps711x_spi_dt_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) .probe = spi_clps711x_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) module_platform_driver(clps711x_spi_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) MODULE_DESCRIPTION("CLPS711X SPI bus driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) MODULE_ALIAS("platform:" DRIVER_NAME);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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