From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> To: Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>, Wolfram Sang <wsa@kernel.org> Cc: soc@kernel.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de, linux-i2c@vger.kernel.org Subject: [PATCH v1 5/7] i2c: Drop unused efm32 bus driver Date: Thu, 14 Jan 2021 16:16:28 +0100 [thread overview] Message-ID: <20210114151630.128830-6-u.kleine-koenig@pengutronix.de> (raw) In-Reply-To: <20210114151630.128830-1-u.kleine-koenig@pengutronix.de> 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 --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); -- 2.29.2
WARNING: multiple messages have this Message-ID (diff)
From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> To: Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>, Wolfram Sang <wsa@kernel.org> Cc: soc@kernel.org, kernel@pengutronix.de, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org Subject: [PATCH v1 5/7] i2c: Drop unused efm32 bus driver Date: Thu, 14 Jan 2021 16:16:28 +0100 [thread overview] Message-ID: <20210114151630.128830-6-u.kleine-koenig@pengutronix.de> (raw) Message-ID: <20210114151628.qxuAgowaCMMGYhfzpWCnHwXqc46viuOqAjydkhMfHIQ@z> (raw) In-Reply-To: <20210114151630.128830-1-u.kleine-koenig@pengutronix.de> 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 --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); -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-01-14 15:16 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-14 15:16 [PATCH v1 0/7] Remove ARM platform efm32 Uwe Kleine-König 2021-01-14 15:16 ` Uwe Kleine-König 2021-01-14 15:16 ` [PATCH v1 1/7] ARM: drop efm32 platform Uwe Kleine-König 2021-01-14 15:16 ` Uwe Kleine-König 2021-01-14 15:16 ` [PATCH v1 2/7] clk: Drop unused efm32gg driver Uwe Kleine-König 2021-01-14 15:16 ` Uwe Kleine-König 2021-02-08 20:21 ` Stephen Boyd 2021-02-08 20:21 ` Stephen Boyd 2021-01-14 15:16 ` [PATCH v1 3/7] clocksource: Drop unused efm32 timer code Uwe Kleine-König 2021-01-14 15:16 ` Uwe Kleine-König 2021-01-14 15:16 ` [PATCH v1 4/7] spi: Drop unused efm32 bus driver Uwe Kleine-König 2021-01-14 15:16 ` Uwe Kleine-König 2021-01-14 15:16 ` Uwe Kleine-König [this message] 2021-01-14 15:16 ` [PATCH v1 5/7] i2c: " Uwe Kleine-König 2021-01-14 15:16 ` [PATCH v1 6/7] tty: Drop unused efm32 serial driver Uwe Kleine-König 2021-01-14 15:16 ` Uwe Kleine-König 2021-01-14 15:34 ` Greg Kroah-Hartman 2021-01-14 15:34 ` Greg Kroah-Hartman 2021-01-14 15:52 ` Uwe Kleine-König 2021-01-14 15:52 ` Uwe Kleine-König 2021-01-14 15:16 ` [PATCH v1 7/7] MAINTAINERS: Remove deleted platform efm32 Uwe Kleine-König 2021-01-14 15:16 ` Uwe Kleine-König 2021-01-15 18:20 ` (subset) [PATCH v1 0/7] Remove ARM " Mark Brown 2021-01-15 18:20 ` Mark Brown
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