summaryrefslogtreecommitdiffstats
path: root/drivers/spi/spi-cavium-octeon.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/spi/spi-cavium-octeon.c')
-rw-r--r--drivers/spi/spi-cavium-octeon.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/spi/spi-cavium-octeon.c b/drivers/spi/spi-cavium-octeon.c
new file mode 100644
index 0000000000..4511c3b312
--- /dev/null
+++ b/drivers/spi/spi-cavium-octeon.c
@@ -0,0 +1,100 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2011, 2012 Cavium, Inc.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/of.h>
+
+#include <asm/octeon/octeon.h>
+
+#include "spi-cavium.h"
+
+static int octeon_spi_probe(struct platform_device *pdev)
+{
+ void __iomem *reg_base;
+ struct spi_controller *host;
+ struct octeon_spi *p;
+ int err = -ENOENT;
+
+ host = spi_alloc_host(&pdev->dev, sizeof(struct octeon_spi));
+ if (!host)
+ return -ENOMEM;
+ p = spi_controller_get_devdata(host);
+ platform_set_drvdata(pdev, host);
+
+ reg_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(reg_base)) {
+ err = PTR_ERR(reg_base);
+ goto fail;
+ }
+
+ p->register_base = reg_base;
+ p->sys_freq = octeon_get_io_clock_rate();
+
+ p->regs.config = 0;
+ p->regs.status = 0x08;
+ p->regs.tx = 0x10;
+ p->regs.data = 0x80;
+
+ host->num_chipselect = 4;
+ host->mode_bits = SPI_CPHA |
+ SPI_CPOL |
+ SPI_CS_HIGH |
+ SPI_LSB_FIRST |
+ SPI_3WIRE;
+
+ host->transfer_one_message = octeon_spi_transfer_one_message;
+ host->bits_per_word_mask = SPI_BPW_MASK(8);
+ host->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ;
+
+ host->dev.of_node = pdev->dev.of_node;
+ err = devm_spi_register_controller(&pdev->dev, host);
+ if (err) {
+ dev_err(&pdev->dev, "register host failed: %d\n", err);
+ goto fail;
+ }
+
+ dev_info(&pdev->dev, "OCTEON SPI bus driver\n");
+
+ return 0;
+fail:
+ spi_controller_put(host);
+ return err;
+}
+
+static void octeon_spi_remove(struct platform_device *pdev)
+{
+ struct spi_controller *host = platform_get_drvdata(pdev);
+ struct octeon_spi *p = spi_controller_get_devdata(host);
+
+ /* Clear the CSENA* and put everything in a known state. */
+ writeq(0, p->register_base + OCTEON_SPI_CFG(p));
+}
+
+static const struct of_device_id octeon_spi_match[] = {
+ { .compatible = "cavium,octeon-3010-spi", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, octeon_spi_match);
+
+static struct platform_driver octeon_spi_driver = {
+ .driver = {
+ .name = "spi-octeon",
+ .of_match_table = octeon_spi_match,
+ },
+ .probe = octeon_spi_probe,
+ .remove_new = octeon_spi_remove,
+};
+
+module_platform_driver(octeon_spi_driver);
+
+MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver");
+MODULE_AUTHOR("David Daney");
+MODULE_LICENSE("GPL");