[PATCH 17/22] spi: remove spi-jcore

Christoph Hellwig
2023-01-13T06:30:53Z

Now that arch/sh is removed this driver is dead code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/spi/Kconfig | 7 --
drivers/spi/Makefile | 1 -
drivers/spi/spi-jcore.c | 235 ----------------------------------------
3 files changed, 243 deletions(-)
delete mode 100644 drivers/spi/spi-jcore.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 76f3bc6f8c81fc..17c75f5c19be75 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -483,13 +483,6 @@ config SPI_INTEL_PLATFORM
To compile this driver as a module, choose M here: the module
will be called spi-intel-platform.

-config SPI_JCORE
- tristate "J-Core SPI Master"
- depends on OF && (SUPERH || COMPILE_TEST)
- help
- This enables support for the SPI master controller in the J-Core
- synthesizable, open source SoC.
-
config SPI_LM70_LLP
tristate "Parallel port adapter for LM70 eval board (DEVELOPMENT)"
depends on PARPORT
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 27d877440c6539..2d03fcefc11ea2 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -67,7 +67,6 @@ obj-$(CONFIG_SPI_INTEL) += spi-intel.o
obj-$(CONFIG_SPI_INTEL_PCI) += spi-intel-pci.o
obj-$(CONFIG_SPI_INTEL_PLATFORM) += spi-intel-platform.o
obj-$(CONFIG_SPI_LANTIQ_SSC) += spi-lantiq-ssc.o
-obj-$(CONFIG_SPI_JCORE) += spi-jcore.o
obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o
obj-$(CONFIG_SPI_LP8841_RTC) += spi-lp8841-rtc.o
obj-$(CONFIG_SPI_MESON_SPICC) += spi-meson-spicc.o
diff --git a/drivers/spi/spi-jcore.c b/drivers/spi/spi-jcore.c
deleted file mode 100644
index 74c8319c29f170..00000000000000
--- a/drivers/spi/spi-jcore.c
+++ /dev/null
@@ -1,235 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * J-Core SPI controller driver
- *
- * Copyright (C) 2012-2016 Smart Energy Instruments, Inc.
- *
- * Current version by Rich Felker
- * Based loosely on initial version by Oleksandr G Zhadan
- *
- */
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/errno.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/spi/spi.h>
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/delay.h>
-
-#define DRV_NAME "jcore_spi"
-
-#define CTRL_REG 0x0
-#define DATA_REG 0x4
-
-#define JCORE_SPI_CTRL_XMIT 0x02
-#define JCORE_SPI_STAT_BUSY 0x02
-#define JCORE_SPI_CTRL_LOOP 0x08
-#define JCORE_SPI_CTRL_CS_BITS 0x15
-
-#define JCORE_SPI_WAIT_RDY_MAX_LOOP 2000000
-
-struct jcore_spi {
- struct spi_master *master;
- void __iomem *base;
- unsigned int cs_reg;
- unsigned int speed_reg;
- unsigned int speed_hz;
- unsigned int clock_freq;
-};
-
-static int jcore_spi_wait(void __iomem *ctrl_reg)
-{
- unsigned timeout = JCORE_SPI_WAIT_RDY_MAX_LOOP;
-
- do {
- if (!(readl(ctrl_reg) & JCORE_SPI_STAT_BUSY))
- return 0;
- cpu_relax();
- } while (--timeout);
-
- return -EBUSY;
-}
-
-static void jcore_spi_program(struct jcore_spi *hw)
-{
- void __iomem *ctrl_reg = hw->base + CTRL_REG;
-
- if (jcore_spi_wait(ctrl_reg))
- dev_err(hw->master->dev.parent,
- "timeout waiting to program ctrl reg.\n");
-
- writel(hw->cs_reg | hw->speed_reg, ctrl_reg);
-}
-
-static void jcore_spi_chipsel(struct spi_device *spi, bool value)
-{
- struct jcore_spi *hw = spi_master_get_devdata(spi->master);
- u32 csbit = 1U << (2 * spi->chip_select);
-
- dev_dbg(hw->master->dev.parent, "chipselect %d\n", spi->chip_select);
-
- if (value)
- hw->cs_reg |= csbit;
- else
- hw->cs_reg &= ~csbit;
-
- jcore_spi_program(hw);
-}
-
-static void jcore_spi_baudrate(struct jcore_spi *hw, int speed)
-{
- if (speed == hw->speed_hz)
- return;
- hw->speed_hz = speed;
- if (speed >= hw->clock_freq / 2)
- hw->speed_reg = 0;
- else
- hw->speed_reg = ((hw->clock_freq / 2 / speed) - 1) << 27;
- jcore_spi_program(hw);
- dev_dbg(hw->master->dev.parent, "speed=%d reg=0x%x\n",
- speed, hw->speed_reg);
-}
-
-static int jcore_spi_txrx(struct spi_master *master, struct spi_device *spi,
- struct spi_transfer *t)
-{
- struct jcore_spi *hw = spi_master_get_devdata(master);
-
- void __iomem *ctrl_reg = hw->base + CTRL_REG;
- void __iomem *data_reg = hw->base + DATA_REG;
- u32 xmit;
-
- /* data buffers */
- const unsigned char *tx;
- unsigned char *rx;
- unsigned int len;
- unsigned int count;
-
- jcore_spi_baudrate(hw, t->speed_hz);
-
- xmit = hw->cs_reg | hw->speed_reg | JCORE_SPI_CTRL_XMIT;
- tx = t->tx_buf;
- rx = t->rx_buf;
- len = t->len;
-
- for (count = 0; count < len; count++) {
- if (jcore_spi_wait(ctrl_reg))
- break;
-
- writel(tx ? *tx++ : 0, data_reg);
- writel(xmit, ctrl_reg);
-
- if (jcore_spi_wait(ctrl_reg))
- break;
-
- if (rx)
- *rx++ = readl(data_reg);
- }
-
- spi_finalize_current_transfer(master);
-
- if (count < len)
- return -EREMOTEIO;
-
- return 0;
-}
-
-static int jcore_spi_probe(struct platform_device *pdev)
-{
- struct device_node *node = pdev->dev.of_node;
- struct jcore_spi *hw;
- struct spi_master *master;
- struct resource *res;
- u32 clock_freq;
- struct clk *clk;
- int err = -ENODEV;
-
- master = spi_alloc_master(&pdev->dev, sizeof(struct jcore_spi));
- if (!master)
- return err;
-
- /* Setup the master state. */
- master->num_chipselect = 3;
- master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
- master->transfer_one = jcore_spi_txrx;
- master->set_cs = jcore_spi_chipsel;
- master->dev.of_node = node;
- master->bus_num = pdev->id;
-
- hw = spi_master_get_devdata(master);
- hw->master = master;
- platform_set_drvdata(pdev, hw);
-
- /* Find and map our resources */
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- goto exit_busy;
- if (!devm_request_mem_region(&pdev->dev, res->start,
- resource_size(res), pdev->name))
- goto exit_busy;
- hw->base = devm_ioremap(&pdev->dev, res->start,
- resource_size(res));
- if (!hw->base)
- goto exit_busy;
-
- /*
- * The SPI clock rate controlled via a configurable clock divider
- * which is applied to the reference clock. A 50 MHz reference is
- * most suitable for obtaining standard SPI clock rates, but some
- * designs may have a different reference clock, and the DT must
- * make the driver aware so that it can properly program the
- * requested rate. If the clock is omitted, 50 MHz is assumed.
- */
- clock_freq = 50000000;
- clk = devm_clk_get(&pdev->dev, "ref_clk");
- if (!IS_ERR(clk)) {
- if (clk_prepare_enable(clk) == 0) {
- clock_freq = clk_get_rate(clk);
- clk_disable_unprepare(clk);
- } else
- dev_warn(&pdev->dev, "could not enable ref_clk\n");
- }
- hw->clock_freq = clock_freq;
-
- /* Initialize all CS bits to high. */
- hw->cs_reg = JCORE_SPI_CTRL_CS_BITS;
- jcore_spi_baudrate(hw, 400000);
-
- /* Register our spi controller */
- err = devm_spi_register_master(&pdev->dev, master);
- if (err)
- goto exit;
-
- return 0;
-
-exit_busy:
- err = -EBUSY;
-exit:
- spi_master_put(master);
- return err;
-}
-
-static const struct of_device_id jcore_spi_of_match[] = {
- { .compatible = "jcore,spi2" },
- {},
-};
-MODULE_DEVICE_TABLE(of, jcore_spi_of_match);
-
-static struct platform_driver jcore_spi_driver = {
- .probe = jcore_spi_probe,
- .driver = {
- .name = DRV_NAME,
- .of_match_table = jcore_spi_of_match,
- },
-};
-
-module_platform_driver(jcore_spi_driver);
-
-MODULE_DESCRIPTION("J-Core SPI driver");
-MODULE_AUTHOR("Rich Felker <dalias@libc.org>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:" DRV_NAME);
--
2.39.0