spi: add xtfpga SPI controller driver (6840cc29) · Commits · 戴 / test

drivers/spi/Kconfig

+13 −0

Original line number	Diff line number	Diff line
		@@ -520,6 +520,19 @@ config SPI_XILINX

		Or for the DS570, see "XPS Serial Peripheral Interface (SPI) (v2.00b)"

		config SPI_XTENSA_XTFPGA
		tristate "Xtensa SPI controller for xtfpga"
		depends on XTENSA && XTENSA_PLATFORM_XTFPGA
		select SPI_BITBANG
		help
		SPI driver for xtfpga SPI master controller.

		This simple SPI master controller is built into xtfpga bitstreams
		and is used to control daughterboard audio codec. It always transfers
		16 bit words in SPI mode 0, automatically asserting CS on transfer
		start and deasserting on end.


		config SPI_NUC900
		tristate "Nuvoton NUC900 series SPI"
		depends on ARCH_W90X900

drivers/spi/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -79,3 +79,4 @@ obj-$(CONFIG_SPI_TOPCLIFF_PCH) += spi-topcliff-pch.o
		obj-$(CONFIG_SPI_TXX9) += spi-txx9.o
		obj-$(CONFIG_SPI_XCOMM) += spi-xcomm.o
		obj-$(CONFIG_SPI_XILINX) += spi-xilinx.o
		obj-$(CONFIG_SPI_XTENSA_XTFPGA) += spi-xtensa-xtfpga.o

drivers/spi/spi-xtensa-xtfpga.c

0 → 100644

+170 −0

Original line number	Diff line number	Diff line
		/*
		* Xtensa xtfpga SPI controller driver
		*
		* Copyright (c) 2014 Cadence Design Systems Inc.
		*
		* 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/delay.h>
		#include <linux/io.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/platform_device.h>
		#include <linux/spi/spi.h>
		#include <linux/spi/spi_bitbang.h>

		#define XTFPGA_SPI_NAME "xtfpga_spi"

		#define XTFPGA_SPI_START 0x0
		#define XTFPGA_SPI_BUSY 0x4
		#define XTFPGA_SPI_DATA 0x8

		#define BUSY_WAIT_US 100

		struct xtfpga_spi {
		struct spi_bitbang bitbang;
		void __iomem *regs;
		u32 data;
		unsigned data_sz;
		};

		static inline void xtfpga_spi_write32(const struct xtfpga_spi *spi,
		unsigned addr, u32 val)
		{
		iowrite32(val, spi->regs + addr);
		}

		static inline unsigned int xtfpga_spi_read32(const struct xtfpga_spi *spi,
		unsigned addr)
		{
		return ioread32(spi->regs + addr);
		}

		static inline void xtfpga_spi_wait_busy(struct xtfpga_spi *xspi)
		{
		unsigned i;
		for (i = 0; xtfpga_spi_read32(xspi, XTFPGA_SPI_BUSY) &&
		i < BUSY_WAIT_US; ++i)
		udelay(1);
		WARN_ON_ONCE(i == BUSY_WAIT_US);
		}

		static u32 xtfpga_spi_txrx_word(struct spi_device *spi, unsigned nsecs,
		u32 v, u8 bits)
		{
		struct xtfpga_spi *xspi = spi_master_get_devdata(spi->master);

		xspi->data = (xspi->data << bits) \| (v & GENMASK(bits - 1, 0));
		xspi->data_sz += bits;
		if (xspi->data_sz >= 16) {
		xtfpga_spi_write32(xspi, XTFPGA_SPI_DATA,
		xspi->data >> (xspi->data_sz - 16));
		xspi->data_sz -= 16;
		xtfpga_spi_write32(xspi, XTFPGA_SPI_START, 1);
		xtfpga_spi_wait_busy(xspi);
		xtfpga_spi_write32(xspi, XTFPGA_SPI_START, 0);
		}

		return 0;
		}

		static void xtfpga_spi_chipselect(struct spi_device *spi, int is_on)
		{
		struct xtfpga_spi *xspi = spi_master_get_devdata(spi->master);

		WARN_ON(xspi->data_sz != 0);
		xspi->data_sz = 0;
		}

		static int xtfpga_spi_probe(struct platform_device *pdev)
		{
		struct xtfpga_spi *xspi;
		struct resource *mem;
		int ret;
		struct spi_master *master;

		master = spi_alloc_master(&pdev->dev, sizeof(struct xtfpga_spi));
		if (!master)
		return -ENOMEM;

		master->flags = SPI_MASTER_NO_RX;
		master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);
		master->bus_num = pdev->dev.id;
		master->dev.of_node = pdev->dev.of_node;

		xspi = spi_master_get_devdata(master);
		xspi->bitbang.master = master;
		xspi->bitbang.chipselect = xtfpga_spi_chipselect;
		xspi->bitbang.txrx_word[SPI_MODE_0] = xtfpga_spi_txrx_word;

		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!mem) {
		dev_err(&pdev->dev, "No memory resource\n");
		ret = -ENODEV;
		goto err;
		}
		xspi->regs = devm_ioremap_resource(&pdev->dev, mem);
		if (IS_ERR(xspi->regs)) {
		ret = PTR_ERR(xspi->regs);
		goto err;
		}

		xtfpga_spi_write32(xspi, XTFPGA_SPI_START, 0);
		usleep_range(1000, 2000);
		if (xtfpga_spi_read32(xspi, XTFPGA_SPI_BUSY)) {
		dev_err(&pdev->dev, "Device stuck in busy state\n");
		ret = -EBUSY;
		goto err;
		}

		ret = spi_bitbang_start(&xspi->bitbang);
		if (ret < 0) {
		dev_err(&pdev->dev, "spi_bitbang_start failed\n");
		goto err;
		}

		platform_set_drvdata(pdev, master);
		return 0;
		err:
		spi_master_put(master);
		return ret;
		}

		static int xtfpga_spi_remove(struct platform_device *pdev)
		{
		struct spi_master *master = platform_get_drvdata(pdev);
		struct xtfpga_spi *xspi = spi_master_get_devdata(master);

		spi_bitbang_stop(&xspi->bitbang);
		spi_master_put(master);

		return 0;
		}

		MODULE_ALIAS("platform:" XTFPGA_SPI_NAME);

		#ifdef CONFIG_OF
		static const struct of_device_id xtfpga_spi_of_match[] = {
		{ .compatible = "cdns,xtfpga-spi", },
		{}
		};
		MODULE_DEVICE_TABLE(of, xtfpga_spi_of_match);
		#endif

		static struct platform_driver xtfpga_spi_driver = {
		.probe = xtfpga_spi_probe,
		.remove = xtfpga_spi_remove,
		.driver = {
		.name = XTFPGA_SPI_NAME,
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(xtfpga_spi_of_match),
		},
		};
		module_platform_driver(xtfpga_spi_driver);

		MODULE_AUTHOR("Max Filippov <jcmvbkbc@gmail.com>");
		MODULE_DESCRIPTION("xtensa xtfpga SPI driver");
		MODULE_LICENSE("GPL");

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