diff mbox series

[v1,5/7] i2c: Drop unused efm32 bus driver

Message ID 20210114151630.128830-6-u.kleine-koenig@pengutronix.de (mailing list archive)
State New, archived
Headers show
Series Remove ARM platform efm32 | expand

Commit Message

Uwe Kleine-König Jan. 14, 2021, 3:16 p.m. UTC
Support for this machine was just removed, so drop the now unused i2c
bus driver, too.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/i2c/busses/Kconfig     |   7 -
 drivers/i2c/busses/Makefile    |   1 -
 drivers/i2c/busses/i2c-efm32.c | 469 ---------------------------------
 3 files changed, 477 deletions(-)
 delete mode 100644 drivers/i2c/busses/i2c-efm32.c
diff mbox series

Patch

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index d4d60ad0eda0..fd919f9339d6 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -586,13 +586,6 @@  config I2C_DIGICOLOR
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-digicolor.
 
-config I2C_EFM32
-	tristate "EFM32 I2C controller"
-	depends on ARCH_EFM32 || COMPILE_TEST
-	help
-	  This driver supports the i2c block found in Energy Micro's EFM32
-	  SoCs.
-
 config I2C_EG20T
 	tristate "Intel EG20T PCH/LAPIS Semicon IOH(ML7213/ML7223/ML7831) I2C"
 	depends on PCI && (X86_32 || MIPS || COMPILE_TEST)
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 683c49faca05..894ff95885b8 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -58,7 +58,6 @@  i2c-designware-platform-$(CONFIG_I2C_DESIGNWARE_BAYTRAIL) += i2c-designware-bayt
 obj-$(CONFIG_I2C_DESIGNWARE_PCI)			+= i2c-designware-pci.o
 i2c-designware-pci-y					:= i2c-designware-pcidrv.o
 obj-$(CONFIG_I2C_DIGICOLOR)	+= i2c-digicolor.o
-obj-$(CONFIG_I2C_EFM32)		+= i2c-efm32.o
 obj-$(CONFIG_I2C_EG20T)		+= i2c-eg20t.o
 obj-$(CONFIG_I2C_EMEV2)		+= i2c-emev2.o
 obj-$(CONFIG_I2C_EXYNOS5)	+= i2c-exynos5.o
diff --git a/drivers/i2c/busses/i2c-efm32.c b/drivers/i2c/busses/i2c-efm32.c
deleted file mode 100644
index f6e13ceeb2b3..000000000000
--- a/drivers/i2c/busses/i2c-efm32.c
+++ /dev/null
@@ -1,469 +0,0 @@ 
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2014 Uwe Kleine-Koenig for Pengutronix
- */
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/i2c.h>
-#include <linux/io.h>
-#include <linux/interrupt.h>
-#include <linux/err.h>
-#include <linux/clk.h>
-
-#define DRIVER_NAME "efm32-i2c"
-
-#define MASK_VAL(mask, val)		((val << __ffs(mask)) & mask)
-
-#define REG_CTRL		0x00
-#define REG_CTRL_EN			0x00001
-#define REG_CTRL_SLAVE			0x00002
-#define REG_CTRL_AUTOACK		0x00004
-#define REG_CTRL_AUTOSE			0x00008
-#define REG_CTRL_AUTOSN			0x00010
-#define REG_CTRL_ARBDIS			0x00020
-#define REG_CTRL_GCAMEN			0x00040
-#define REG_CTRL_CLHR__MASK		0x00300
-#define REG_CTRL_BITO__MASK		0x03000
-#define REG_CTRL_BITO_OFF		0x00000
-#define REG_CTRL_BITO_40PCC		0x01000
-#define REG_CTRL_BITO_80PCC		0x02000
-#define REG_CTRL_BITO_160PCC		0x03000
-#define REG_CTRL_GIBITO			0x08000
-#define REG_CTRL_CLTO__MASK		0x70000
-#define REG_CTRL_CLTO_OFF		0x00000
-
-#define REG_CMD			0x04
-#define REG_CMD_START			0x00001
-#define REG_CMD_STOP			0x00002
-#define REG_CMD_ACK			0x00004
-#define REG_CMD_NACK			0x00008
-#define REG_CMD_CONT			0x00010
-#define REG_CMD_ABORT			0x00020
-#define REG_CMD_CLEARTX			0x00040
-#define REG_CMD_CLEARPC			0x00080
-
-#define REG_STATE		0x08
-#define REG_STATE_BUSY			0x00001
-#define REG_STATE_MASTER		0x00002
-#define REG_STATE_TRANSMITTER		0x00004
-#define REG_STATE_NACKED		0x00008
-#define REG_STATE_BUSHOLD		0x00010
-#define REG_STATE_STATE__MASK		0x000e0
-#define REG_STATE_STATE_IDLE		0x00000
-#define REG_STATE_STATE_WAIT		0x00020
-#define REG_STATE_STATE_START		0x00040
-#define REG_STATE_STATE_ADDR		0x00060
-#define REG_STATE_STATE_ADDRACK		0x00080
-#define REG_STATE_STATE_DATA		0x000a0
-#define REG_STATE_STATE_DATAACK		0x000c0
-
-#define REG_STATUS		0x0c
-#define REG_STATUS_PSTART		0x00001
-#define REG_STATUS_PSTOP		0x00002
-#define REG_STATUS_PACK			0x00004
-#define REG_STATUS_PNACK		0x00008
-#define REG_STATUS_PCONT		0x00010
-#define REG_STATUS_PABORT		0x00020
-#define REG_STATUS_TXC			0x00040
-#define REG_STATUS_TXBL			0x00080
-#define REG_STATUS_RXDATAV		0x00100
-
-#define REG_CLKDIV		0x10
-#define REG_CLKDIV_DIV__MASK		0x001ff
-#define REG_CLKDIV_DIV(div)		MASK_VAL(REG_CLKDIV_DIV__MASK, (div))
-
-#define REG_SADDR		0x14
-#define REG_SADDRMASK		0x18
-#define REG_RXDATA		0x1c
-#define REG_RXDATAP		0x20
-#define REG_TXDATA		0x24
-#define REG_IF			0x28
-#define REG_IF_START			0x00001
-#define REG_IF_RSTART			0x00002
-#define REG_IF_ADDR			0x00004
-#define REG_IF_TXC			0x00008
-#define REG_IF_TXBL			0x00010
-#define REG_IF_RXDATAV			0x00020
-#define REG_IF_ACK			0x00040
-#define REG_IF_NACK			0x00080
-#define REG_IF_MSTOP			0x00100
-#define REG_IF_ARBLOST			0x00200
-#define REG_IF_BUSERR			0x00400
-#define REG_IF_BUSHOLD			0x00800
-#define REG_IF_TXOF			0x01000
-#define REG_IF_RXUF			0x02000
-#define REG_IF_BITO			0x04000
-#define REG_IF_CLTO			0x08000
-#define REG_IF_SSTOP			0x10000
-
-#define REG_IFS			0x2c
-#define REG_IFC			0x30
-#define REG_IFC__MASK			0x1ffcf
-
-#define REG_IEN			0x34
-
-#define REG_ROUTE		0x38
-#define REG_ROUTE_SDAPEN		0x00001
-#define REG_ROUTE_SCLPEN		0x00002
-#define REG_ROUTE_LOCATION__MASK	0x00700
-#define REG_ROUTE_LOCATION(n)		MASK_VAL(REG_ROUTE_LOCATION__MASK, (n))
-
-struct efm32_i2c_ddata {
-	struct i2c_adapter adapter;
-
-	struct clk *clk;
-	void __iomem *base;
-	unsigned int irq;
-	u8 location;
-	unsigned long frequency;
-
-	/* transfer data */
-	struct completion done;
-	struct i2c_msg *msgs;
-	size_t num_msgs;
-	size_t current_word, current_msg;
-	int retval;
-};
-
-static u32 efm32_i2c_read32(struct efm32_i2c_ddata *ddata, unsigned offset)
-{
-	return readl(ddata->base + offset);
-}
-
-static void efm32_i2c_write32(struct efm32_i2c_ddata *ddata,
-		unsigned offset, u32 value)
-{
-	writel(value, ddata->base + offset);
-}
-
-static void efm32_i2c_send_next_msg(struct efm32_i2c_ddata *ddata)
-{
-	struct i2c_msg *cur_msg = &ddata->msgs[ddata->current_msg];
-
-	efm32_i2c_write32(ddata, REG_CMD, REG_CMD_START);
-	efm32_i2c_write32(ddata, REG_TXDATA, i2c_8bit_addr_from_msg(cur_msg));
-}
-
-static void efm32_i2c_send_next_byte(struct efm32_i2c_ddata *ddata)
-{
-	struct i2c_msg *cur_msg = &ddata->msgs[ddata->current_msg];
-
-	if (ddata->current_word >= cur_msg->len) {
-		/* cur_msg completely transferred */
-		ddata->current_word = 0;
-		ddata->current_msg += 1;
-
-		if (ddata->current_msg >= ddata->num_msgs) {
-			efm32_i2c_write32(ddata, REG_CMD, REG_CMD_STOP);
-			complete(&ddata->done);
-		} else {
-			efm32_i2c_send_next_msg(ddata);
-		}
-	} else {
-		efm32_i2c_write32(ddata, REG_TXDATA,
-				cur_msg->buf[ddata->current_word++]);
-	}
-}
-
-static void efm32_i2c_recv_next_byte(struct efm32_i2c_ddata *ddata)
-{
-	struct i2c_msg *cur_msg = &ddata->msgs[ddata->current_msg];
-
-	cur_msg->buf[ddata->current_word] = efm32_i2c_read32(ddata, REG_RXDATA);
-	ddata->current_word += 1;
-	if (ddata->current_word >= cur_msg->len) {
-		/* cur_msg completely transferred */
-		ddata->current_word = 0;
-		ddata->current_msg += 1;
-
-		efm32_i2c_write32(ddata, REG_CMD, REG_CMD_NACK);
-
-		if (ddata->current_msg >= ddata->num_msgs) {
-			efm32_i2c_write32(ddata, REG_CMD, REG_CMD_STOP);
-			complete(&ddata->done);
-		} else {
-			efm32_i2c_send_next_msg(ddata);
-		}
-	} else {
-		efm32_i2c_write32(ddata, REG_CMD, REG_CMD_ACK);
-	}
-}
-
-static irqreturn_t efm32_i2c_irq(int irq, void *dev_id)
-{
-	struct efm32_i2c_ddata *ddata = dev_id;
-	struct i2c_msg *cur_msg = &ddata->msgs[ddata->current_msg];
-	u32 irqflag = efm32_i2c_read32(ddata, REG_IF);
-	u32 state = efm32_i2c_read32(ddata, REG_STATE);
-
-	efm32_i2c_write32(ddata, REG_IFC, irqflag & REG_IFC__MASK);
-
-	switch (state & REG_STATE_STATE__MASK) {
-	case REG_STATE_STATE_IDLE:
-		/* arbitration lost? */
-		ddata->retval = -EAGAIN;
-		complete(&ddata->done);
-		break;
-	case REG_STATE_STATE_WAIT:
-		/*
-		 * huh, this shouldn't happen.
-		 * Reset hardware state and get out
-		 */
-		ddata->retval = -EIO;
-		efm32_i2c_write32(ddata, REG_CMD,
-				REG_CMD_STOP | REG_CMD_ABORT |
-				REG_CMD_CLEARTX | REG_CMD_CLEARPC);
-		complete(&ddata->done);
-		break;
-	case REG_STATE_STATE_START:
-		/* "caller" is expected to send an address */
-		break;
-	case REG_STATE_STATE_ADDR:
-		/* wait for Ack or NAck of slave */
-		break;
-	case REG_STATE_STATE_ADDRACK:
-		if (state & REG_STATE_NACKED) {
-			efm32_i2c_write32(ddata, REG_CMD, REG_CMD_STOP);
-			ddata->retval = -ENXIO;
-			complete(&ddata->done);
-		} else if (cur_msg->flags & I2C_M_RD) {
-			/* wait for slave to send first data byte */
-		} else {
-			efm32_i2c_send_next_byte(ddata);
-		}
-		break;
-	case REG_STATE_STATE_DATA:
-		if (cur_msg->flags & I2C_M_RD) {
-			efm32_i2c_recv_next_byte(ddata);
-		} else {
-			/* wait for Ack or Nack of slave */
-		}
-		break;
-	case REG_STATE_STATE_DATAACK:
-		if (state & REG_STATE_NACKED) {
-			efm32_i2c_write32(ddata, REG_CMD, REG_CMD_STOP);
-			complete(&ddata->done);
-		} else {
-			efm32_i2c_send_next_byte(ddata);
-		}
-	}
-
-	return IRQ_HANDLED;
-}
-
-static int efm32_i2c_master_xfer(struct i2c_adapter *adap,
-		struct i2c_msg *msgs, int num)
-{
-	struct efm32_i2c_ddata *ddata = i2c_get_adapdata(adap);
-	int ret;
-
-	if (ddata->msgs)
-		return -EBUSY;
-
-	ddata->msgs = msgs;
-	ddata->num_msgs = num;
-	ddata->current_word = 0;
-	ddata->current_msg = 0;
-	ddata->retval = -EIO;
-
-	reinit_completion(&ddata->done);
-
-	dev_dbg(&ddata->adapter.dev, "state: %08x, status: %08x\n",
-			efm32_i2c_read32(ddata, REG_STATE),
-			efm32_i2c_read32(ddata, REG_STATUS));
-
-	efm32_i2c_send_next_msg(ddata);
-
-	wait_for_completion(&ddata->done);
-
-	if (ddata->current_msg >= ddata->num_msgs)
-		ret = ddata->num_msgs;
-	else
-		ret = ddata->retval;
-
-	return ret;
-}
-
-static u32 efm32_i2c_functionality(struct i2c_adapter *adap)
-{
-	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
-}
-
-static const struct i2c_algorithm efm32_i2c_algo = {
-	.master_xfer = efm32_i2c_master_xfer,
-	.functionality = efm32_i2c_functionality,
-};
-
-static u32 efm32_i2c_get_configured_location(struct efm32_i2c_ddata *ddata)
-{
-	u32 reg = efm32_i2c_read32(ddata, REG_ROUTE);
-
-	return (reg & REG_ROUTE_LOCATION__MASK) >>
-		__ffs(REG_ROUTE_LOCATION__MASK);
-}
-
-static int efm32_i2c_probe(struct platform_device *pdev)
-{
-	struct efm32_i2c_ddata *ddata;
-	struct resource *res;
-	unsigned long rate;
-	struct device_node *np = pdev->dev.of_node;
-	u32 location, frequency;
-	int ret;
-	u32 clkdiv;
-
-	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
-	if (!ddata)
-		return -ENOMEM;
-	platform_set_drvdata(pdev, ddata);
-
-	init_completion(&ddata->done);
-	strlcpy(ddata->adapter.name, pdev->name, sizeof(ddata->adapter.name));
-	ddata->adapter.owner = THIS_MODULE;
-	ddata->adapter.algo = &efm32_i2c_algo;
-	ddata->adapter.dev.parent = &pdev->dev;
-	ddata->adapter.dev.of_node = pdev->dev.of_node;
-	i2c_set_adapdata(&ddata->adapter, ddata);
-
-	ddata->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(ddata->clk)) {
-		ret = PTR_ERR(ddata->clk);
-		dev_err(&pdev->dev, "failed to get clock: %d\n", ret);
-		return ret;
-	}
-
-	ddata->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
-	if (IS_ERR(ddata->base))
-		return PTR_ERR(ddata->base);
-
-	if (resource_size(res) < 0x42) {
-		dev_err(&pdev->dev, "memory resource too small\n");
-		return -EINVAL;
-	}
-
-	ret = platform_get_irq(pdev, 0);
-	if (ret <= 0) {
-		if (!ret)
-			ret = -EINVAL;
-		return ret;
-	}
-
-	ddata->irq = ret;
-
-	ret = clk_prepare_enable(ddata->clk);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to enable clock (%d)\n", ret);
-		return ret;
-	}
-
-
-	ret = of_property_read_u32(np, "energymicro,location", &location);
-
-	if (ret)
-		/* fall back to wrongly namespaced property */
-		ret = of_property_read_u32(np, "efm32,location", &location);
-
-	if (!ret) {
-		dev_dbg(&pdev->dev, "using location %u\n", location);
-	} else {
-		/* default to location configured in hardware */
-		location = efm32_i2c_get_configured_location(ddata);
-
-		dev_info(&pdev->dev, "fall back to location %u\n", location);
-	}
-
-	ddata->location = location;
-
-	ret = of_property_read_u32(np, "clock-frequency", &frequency);
-	if (!ret) {
-		dev_dbg(&pdev->dev, "using frequency %u\n", frequency);
-	} else {
-		frequency = I2C_MAX_STANDARD_MODE_FREQ;
-		dev_info(&pdev->dev, "defaulting to 100 kHz\n");
-	}
-	ddata->frequency = frequency;
-
-	rate = clk_get_rate(ddata->clk);
-	if (!rate) {
-		dev_err(&pdev->dev, "there is no input clock available\n");
-		ret = -EINVAL;
-		goto err_disable_clk;
-	}
-	clkdiv = DIV_ROUND_UP(rate, 8 * ddata->frequency) - 1;
-	if (clkdiv >= 0x200) {
-		dev_err(&pdev->dev,
-				"input clock too fast (%lu) to divide down to bus freq (%lu)",
-				rate, ddata->frequency);
-		ret = -EINVAL;
-		goto err_disable_clk;
-	}
-
-	dev_dbg(&pdev->dev, "input clock = %lu, bus freq = %lu, clkdiv = %lu\n",
-			rate, ddata->frequency, (unsigned long)clkdiv);
-	efm32_i2c_write32(ddata, REG_CLKDIV, REG_CLKDIV_DIV(clkdiv));
-
-	efm32_i2c_write32(ddata, REG_ROUTE, REG_ROUTE_SDAPEN |
-			REG_ROUTE_SCLPEN |
-			REG_ROUTE_LOCATION(ddata->location));
-
-	efm32_i2c_write32(ddata, REG_CTRL, REG_CTRL_EN |
-			REG_CTRL_BITO_160PCC | 0 * REG_CTRL_GIBITO);
-
-	efm32_i2c_write32(ddata, REG_IFC, REG_IFC__MASK);
-	efm32_i2c_write32(ddata, REG_IEN, REG_IF_TXC | REG_IF_ACK | REG_IF_NACK
-			| REG_IF_ARBLOST | REG_IF_BUSERR | REG_IF_RXDATAV);
-
-	/* to make bus idle */
-	efm32_i2c_write32(ddata, REG_CMD, REG_CMD_ABORT);
-
-	ret = request_irq(ddata->irq, efm32_i2c_irq, 0, DRIVER_NAME, ddata);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to request irq (%d)\n", ret);
-		goto err_disable_clk;
-	}
-
-	ret = i2c_add_adapter(&ddata->adapter);
-	if (ret) {
-		free_irq(ddata->irq, ddata);
-
-err_disable_clk:
-		clk_disable_unprepare(ddata->clk);
-	}
-	return ret;
-}
-
-static int efm32_i2c_remove(struct platform_device *pdev)
-{
-	struct efm32_i2c_ddata *ddata = platform_get_drvdata(pdev);
-
-	i2c_del_adapter(&ddata->adapter);
-	free_irq(ddata->irq, ddata);
-	clk_disable_unprepare(ddata->clk);
-
-	return 0;
-}
-
-static const struct of_device_id efm32_i2c_dt_ids[] = {
-	{
-		.compatible = "energymicro,efm32-i2c",
-	}, {
-		/* sentinel */
-	}
-};
-MODULE_DEVICE_TABLE(of, efm32_i2c_dt_ids);
-
-static struct platform_driver efm32_i2c_driver = {
-	.probe = efm32_i2c_probe,
-	.remove = efm32_i2c_remove,
-
-	.driver = {
-		.name = DRIVER_NAME,
-		.of_match_table = efm32_i2c_dt_ids,
-	},
-};
-module_platform_driver(efm32_i2c_driver);
-
-MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
-MODULE_DESCRIPTION("EFM32 i2c driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:" DRIVER_NAME);