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path: root/drivers/spi/spi-altera.c
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Diffstat (limited to 'drivers/spi/spi-altera.c')
-rw-r--r--drivers/spi/spi-altera.c249
1 files changed, 0 insertions, 249 deletions
diff --git a/drivers/spi/spi-altera.c b/drivers/spi/spi-altera.c
deleted file mode 100644
index a5adf0d868fc..000000000000
--- a/drivers/spi/spi-altera.c
+++ /dev/null
@@ -1,249 +0,0 @@
-/*
- * Altera SPI driver
- *
- * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
- *
- * Based on spi_s3c24xx.c, which is:
- * Copyright (c) 2006 Ben Dooks
- * Copyright (c) 2006 Simtec Electronics
- * Ben Dooks <ben@simtec.co.uk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/interrupt.h>
-#include <linux/errno.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/spi/spi.h>
-#include <linux/io.h>
-#include <linux/of.h>
-
-#define DRV_NAME "spi_altera"
-
-#define ALTERA_SPI_RXDATA 0
-#define ALTERA_SPI_TXDATA 4
-#define ALTERA_SPI_STATUS 8
-#define ALTERA_SPI_CONTROL 12
-#define ALTERA_SPI_SLAVE_SEL 20
-
-#define ALTERA_SPI_STATUS_ROE_MSK 0x8
-#define ALTERA_SPI_STATUS_TOE_MSK 0x10
-#define ALTERA_SPI_STATUS_TMT_MSK 0x20
-#define ALTERA_SPI_STATUS_TRDY_MSK 0x40
-#define ALTERA_SPI_STATUS_RRDY_MSK 0x80
-#define ALTERA_SPI_STATUS_E_MSK 0x100
-
-#define ALTERA_SPI_CONTROL_IROE_MSK 0x8
-#define ALTERA_SPI_CONTROL_ITOE_MSK 0x10
-#define ALTERA_SPI_CONTROL_ITRDY_MSK 0x40
-#define ALTERA_SPI_CONTROL_IRRDY_MSK 0x80
-#define ALTERA_SPI_CONTROL_IE_MSK 0x100
-#define ALTERA_SPI_CONTROL_SSO_MSK 0x400
-
-struct altera_spi {
- void __iomem *base;
- int irq;
- int len;
- int count;
- int bytes_per_word;
- unsigned long imr;
-
- /* data buffers */
- const unsigned char *tx;
- unsigned char *rx;
-};
-
-static inline struct altera_spi *altera_spi_to_hw(struct spi_device *sdev)
-{
- return spi_master_get_devdata(sdev->master);
-}
-
-static void altera_spi_set_cs(struct spi_device *spi, bool is_high)
-{
- struct altera_spi *hw = altera_spi_to_hw(spi);
-
- if (is_high) {
- hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK;
- writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);
- writel(0, hw->base + ALTERA_SPI_SLAVE_SEL);
- } else {
- writel(BIT(spi->chip_select), hw->base + ALTERA_SPI_SLAVE_SEL);
- hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK;
- writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);
- }
-}
-
-static void altera_spi_tx_word(struct altera_spi *hw)
-{
- unsigned int txd = 0;
-
- if (hw->tx) {
- switch (hw->bytes_per_word) {
- case 1:
- txd = hw->tx[hw->count];
- break;
- case 2:
- txd = (hw->tx[hw->count * 2]
- | (hw->tx[hw->count * 2 + 1] << 8));
- break;
- }
- }
-
- writel(txd, hw->base + ALTERA_SPI_TXDATA);
-}
-
-static void altera_spi_rx_word(struct altera_spi *hw)
-{
- unsigned int rxd;
-
- rxd = readl(hw->base + ALTERA_SPI_RXDATA);
- if (hw->rx) {
- switch (hw->bytes_per_word) {
- case 1:
- hw->rx[hw->count] = rxd;
- break;
- case 2:
- hw->rx[hw->count * 2] = rxd;
- hw->rx[hw->count * 2 + 1] = rxd >> 8;
- break;
- }
- }
-
- hw->count++;
-}
-
-static int altera_spi_txrx(struct spi_master *master,
- struct spi_device *spi, struct spi_transfer *t)
-{
- struct altera_spi *hw = spi_master_get_devdata(master);
-
- hw->tx = t->tx_buf;
- hw->rx = t->rx_buf;
- hw->count = 0;
- hw->bytes_per_word = DIV_ROUND_UP(t->bits_per_word, 8);
- hw->len = t->len / hw->bytes_per_word;
-
- if (hw->irq >= 0) {
- /* enable receive interrupt */
- hw->imr |= ALTERA_SPI_CONTROL_IRRDY_MSK;
- writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);
-
- /* send the first byte */
- altera_spi_tx_word(hw);
- } else {
- while (hw->count < hw->len) {
- altera_spi_tx_word(hw);
-
- while (!(readl(hw->base + ALTERA_SPI_STATUS) &
- ALTERA_SPI_STATUS_RRDY_MSK))
- cpu_relax();
-
- altera_spi_rx_word(hw);
- }
- spi_finalize_current_transfer(master);
- }
-
- return t->len;
-}
-
-static irqreturn_t altera_spi_irq(int irq, void *dev)
-{
- struct spi_master *master = dev;
- struct altera_spi *hw = spi_master_get_devdata(master);
-
- altera_spi_rx_word(hw);
-
- if (hw->count < hw->len) {
- altera_spi_tx_word(hw);
- } else {
- /* disable receive interrupt */
- hw->imr &= ~ALTERA_SPI_CONTROL_IRRDY_MSK;
- writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);
-
- spi_finalize_current_transfer(master);
- }
-
- return IRQ_HANDLED;
-}
-
-static int altera_spi_probe(struct platform_device *pdev)
-{
- struct altera_spi *hw;
- struct spi_master *master;
- struct resource *res;
- int err = -ENODEV;
-
- master = spi_alloc_master(&pdev->dev, sizeof(struct altera_spi));
- if (!master)
- return err;
-
- /* setup the master state. */
- master->bus_num = pdev->id;
- master->num_chipselect = 16;
- master->mode_bits = SPI_CS_HIGH;
- master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);
- master->dev.of_node = pdev->dev.of_node;
- master->transfer_one = altera_spi_txrx;
- master->set_cs = altera_spi_set_cs;
-
- hw = spi_master_get_devdata(master);
-
- /* find and map our resources */
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- hw->base = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(hw->base)) {
- err = PTR_ERR(hw->base);
- goto exit;
- }
- /* program defaults into the registers */
- hw->imr = 0; /* disable spi interrupts */
- writel(hw->imr, hw->base + ALTERA_SPI_CONTROL);
- writel(0, hw->base + ALTERA_SPI_STATUS); /* clear status reg */
- if (readl(hw->base + ALTERA_SPI_STATUS) & ALTERA_SPI_STATUS_RRDY_MSK)
- readl(hw->base + ALTERA_SPI_RXDATA); /* flush rxdata */
- /* irq is optional */
- hw->irq = platform_get_irq(pdev, 0);
- if (hw->irq >= 0) {
- err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0,
- pdev->name, master);
- if (err)
- goto exit;
- }
-
- err = devm_spi_register_master(&pdev->dev, master);
- if (err)
- goto exit;
- dev_info(&pdev->dev, "base %p, irq %d\n", hw->base, hw->irq);
-
- return 0;
-exit:
- spi_master_put(master);
- return err;
-}
-
-#ifdef CONFIG_OF
-static const struct of_device_id altera_spi_match[] = {
- { .compatible = "ALTR,spi-1.0", },
- { .compatible = "altr,spi-1.0", },
- {},
-};
-MODULE_DEVICE_TABLE(of, altera_spi_match);
-#endif /* CONFIG_OF */
-
-static struct platform_driver altera_spi_driver = {
- .probe = altera_spi_probe,
- .driver = {
- .name = DRV_NAME,
- .pm = NULL,
- .of_match_table = of_match_ptr(altera_spi_match),
- },
-};
-module_platform_driver(altera_spi_driver);
-
-MODULE_DESCRIPTION("Altera SPI driver");
-MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:" DRV_NAME);
generated by cgit (git 2.34.1) at 2025-12-24 19:28:31 +0000