From 5acd48fa72ad16b824a9117254ce48ed69c914e8 Mon Sep 17 00:00:00 2001 From: Hans Hu Date: Mon, 8 Apr 2024 10:54:44 +0800 Subject: [PATCH] i2c: wmt: split out common files Since the I2C IP of both wmt and zhaoxin originates from VIA, it is better to separate the common code first. The common driver is named as i2c-viai2c-common.c. Old i2c-wmt.c renamed to i2c-viai2c-wmt.c. The MAINTAINERS file will be updated accordingly in upcoming commits. Reviewed-by: Wolfram Sang Signed-off-by: Hans Hu Signed-off-by: Andi Shyti --- MAINTAINERS | 2 +- drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-viai2c-common.c | 221 +++++++++++++ drivers/i2c/busses/i2c-viai2c-common.h | 71 ++++ drivers/i2c/busses/i2c-viai2c-wmt.c | 148 +++++++++ drivers/i2c/busses/i2c-wmt.c | 430 ------------------------- 6 files changed, 442 insertions(+), 431 deletions(-) create mode 100644 drivers/i2c/busses/i2c-viai2c-common.c create mode 100644 drivers/i2c/busses/i2c-viai2c-common.h create mode 100644 drivers/i2c/busses/i2c-viai2c-wmt.c delete mode 100644 drivers/i2c/busses/i2c-wmt.c diff --git a/MAINTAINERS b/MAINTAINERS index 75554f93e555..a3491d1aa7c3 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3017,7 +3017,7 @@ S: Orphan F: Documentation/devicetree/bindings/i2c/i2c-wmt.txt F: arch/arm/mach-vt8500/ F: drivers/clocksource/timer-vt8500.c -F: drivers/i2c/busses/i2c-wmt.c +F: drivers/i2c/busses/i2c-viai2c-wmt.c F: drivers/mmc/host/wmt-sdmmc.c F: drivers/pwm/pwm-vt8500.c F: drivers/rtc/rtc-vt8500.c diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index aa0ee8ecd6f2..63c7bbad8134 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -118,6 +118,7 @@ obj-$(CONFIG_I2C_TEGRA_BPMP) += i2c-tegra-bpmp.o obj-$(CONFIG_I2C_UNIPHIER) += i2c-uniphier.o obj-$(CONFIG_I2C_UNIPHIER_F) += i2c-uniphier-f.o obj-$(CONFIG_I2C_VERSATILE) += i2c-versatile.o +i2c-wmt-objs := i2c-viai2c-wmt.o i2c-viai2c-common.o obj-$(CONFIG_I2C_WMT) += i2c-wmt.o i2c-octeon-objs := i2c-octeon-core.o i2c-octeon-platdrv.o obj-$(CONFIG_I2C_OCTEON) += i2c-octeon.o diff --git a/drivers/i2c/busses/i2c-viai2c-common.c b/drivers/i2c/busses/i2c-viai2c-common.c new file mode 100644 index 000000000000..b36a5d902990 --- /dev/null +++ b/drivers/i2c/busses/i2c-viai2c-common.c @@ -0,0 +1,221 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +#include +#include "i2c-viai2c-common.h" + +int wmt_i2c_wait_bus_not_busy(struct wmt_i2c_dev *i2c_dev) +{ + unsigned long timeout; + + timeout = jiffies + WMT_I2C_TIMEOUT; + while (!(readw(i2c_dev->base + REG_CSR) & CSR_READY_MASK)) { + if (time_after(jiffies, timeout)) { + dev_warn(i2c_dev->dev, "timeout waiting for bus ready\n"); + return -EBUSY; + } + msleep(20); + } + + return 0; +} + +int wmt_check_status(struct wmt_i2c_dev *i2c_dev) +{ + int ret = 0; + unsigned long wait_result; + + wait_result = wait_for_completion_timeout(&i2c_dev->complete, + msecs_to_jiffies(500)); + if (!wait_result) + return -ETIMEDOUT; + + if (i2c_dev->cmd_status & ISR_NACK_ADDR) + ret = -EIO; + + if (i2c_dev->cmd_status & ISR_SCL_TIMEOUT) + ret = -ETIMEDOUT; + + return ret; +} + +static int wmt_i2c_write(struct wmt_i2c_dev *i2c_dev, struct i2c_msg *pmsg, int last) +{ + u16 val, tcr_val = i2c_dev->tcr; + int ret; + int xfer_len = 0; + + if (pmsg->len == 0) { + /* + * We still need to run through the while (..) once, so + * start at -1 and break out early from the loop + */ + xfer_len = -1; + writew(0, i2c_dev->base + REG_CDR); + } else { + writew(pmsg->buf[0] & 0xFF, i2c_dev->base + REG_CDR); + } + + if (!(pmsg->flags & I2C_M_NOSTART)) { + val = readw(i2c_dev->base + REG_CR); + val &= ~CR_TX_END; + val |= CR_CPU_RDY; + writew(val, i2c_dev->base + REG_CR); + } + + reinit_completion(&i2c_dev->complete); + + tcr_val |= (TCR_MASTER_WRITE | (pmsg->addr & TCR_SLAVE_ADDR_MASK)); + + writew(tcr_val, i2c_dev->base + REG_TCR); + + if (pmsg->flags & I2C_M_NOSTART) { + val = readw(i2c_dev->base + REG_CR); + val |= CR_CPU_RDY; + writew(val, i2c_dev->base + REG_CR); + } + + while (xfer_len < pmsg->len) { + ret = wmt_check_status(i2c_dev); + if (ret) + return ret; + + xfer_len++; + + val = readw(i2c_dev->base + REG_CSR); + if ((val & CSR_RCV_ACK_MASK) == CSR_RCV_NOT_ACK) { + dev_dbg(i2c_dev->dev, "write RCV NACK error\n"); + return -EIO; + } + + if (pmsg->len == 0) { + val = CR_TX_END | CR_CPU_RDY | CR_ENABLE; + writew(val, i2c_dev->base + REG_CR); + break; + } + + if (xfer_len == pmsg->len) { + if (last != 1) + writew(CR_ENABLE, i2c_dev->base + REG_CR); + } else { + writew(pmsg->buf[xfer_len] & 0xFF, i2c_dev->base + + REG_CDR); + writew(CR_CPU_RDY | CR_ENABLE, i2c_dev->base + REG_CR); + } + } + + return 0; +} + +static int wmt_i2c_read(struct wmt_i2c_dev *i2c_dev, struct i2c_msg *pmsg) +{ + u16 val, tcr_val = i2c_dev->tcr; + int ret; + u32 xfer_len = 0; + + val = readw(i2c_dev->base + REG_CR); + val &= ~(CR_TX_END | CR_TX_NEXT_NO_ACK); + + if (!(pmsg->flags & I2C_M_NOSTART)) + val |= CR_CPU_RDY; + + if (pmsg->len == 1) + val |= CR_TX_NEXT_NO_ACK; + + writew(val, i2c_dev->base + REG_CR); + + reinit_completion(&i2c_dev->complete); + + tcr_val |= TCR_MASTER_READ | (pmsg->addr & TCR_SLAVE_ADDR_MASK); + + writew(tcr_val, i2c_dev->base + REG_TCR); + + if (pmsg->flags & I2C_M_NOSTART) { + val = readw(i2c_dev->base + REG_CR); + val |= CR_CPU_RDY; + writew(val, i2c_dev->base + REG_CR); + } + + while (xfer_len < pmsg->len) { + ret = wmt_check_status(i2c_dev); + if (ret) + return ret; + + pmsg->buf[xfer_len] = readw(i2c_dev->base + REG_CDR) >> 8; + xfer_len++; + + val = readw(i2c_dev->base + REG_CR) | CR_CPU_RDY; + if (xfer_len == pmsg->len - 1) + val |= CR_TX_NEXT_NO_ACK; + writew(val, i2c_dev->base + REG_CR); + } + + return 0; +} + +int wmt_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) +{ + struct i2c_msg *pmsg; + int i; + int ret = 0; + struct wmt_i2c_dev *i2c_dev = i2c_get_adapdata(adap); + + for (i = 0; ret >= 0 && i < num; i++) { + pmsg = &msgs[i]; + if (!(pmsg->flags & I2C_M_NOSTART)) { + ret = wmt_i2c_wait_bus_not_busy(i2c_dev); + if (ret < 0) + return ret; + } + + if (pmsg->flags & I2C_M_RD) + ret = wmt_i2c_read(i2c_dev, pmsg); + else + ret = wmt_i2c_write(i2c_dev, pmsg, (i + 1) == num); + } + + return (ret < 0) ? ret : i; +} + +static irqreturn_t wmt_i2c_isr(int irq, void *data) +{ + struct wmt_i2c_dev *i2c_dev = data; + + /* save the status and write-clear it */ + i2c_dev->cmd_status = readw(i2c_dev->base + REG_ISR); + writew(i2c_dev->cmd_status, i2c_dev->base + REG_ISR); + + complete(&i2c_dev->complete); + + return IRQ_HANDLED; +} + +int wmt_i2c_init(struct platform_device *pdev, struct wmt_i2c_dev **pi2c_dev) +{ + int err; + struct wmt_i2c_dev *i2c_dev; + struct device_node *np = pdev->dev.of_node; + + i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL); + if (!i2c_dev) + return -ENOMEM; + + i2c_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); + if (IS_ERR(i2c_dev->base)) + return PTR_ERR(i2c_dev->base); + + i2c_dev->irq = irq_of_parse_and_map(np, 0); + if (!i2c_dev->irq) + return -EINVAL; + + err = devm_request_irq(&pdev->dev, i2c_dev->irq, wmt_i2c_isr, + 0, pdev->name, i2c_dev); + if (err) + return dev_err_probe(&pdev->dev, err, + "failed to request irq %i\n", i2c_dev->irq); + + i2c_dev->dev = &pdev->dev; + init_completion(&i2c_dev->complete); + platform_set_drvdata(pdev, i2c_dev); + + *pi2c_dev = i2c_dev; + return 0; +} diff --git a/drivers/i2c/busses/i2c-viai2c-common.h b/drivers/i2c/busses/i2c-viai2c-common.h new file mode 100644 index 000000000000..fcff8e4456eb --- /dev/null +++ b/drivers/i2c/busses/i2c-viai2c-common.h @@ -0,0 +1,71 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __I2C_VIAI2C_COMMON_H_ +#define __I2C_VIAI2C_COMMON_H_ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define REG_CR 0x00 +#define REG_TCR 0x02 +#define REG_CSR 0x04 +#define REG_ISR 0x06 +#define REG_IMR 0x08 +#define REG_CDR 0x0A +#define REG_TR 0x0C +#define REG_MCR 0x0E + +/* REG_CR Bit fields */ +#define CR_TX_NEXT_ACK 0x0000 +#define CR_ENABLE 0x0001 +#define CR_TX_NEXT_NO_ACK 0x0002 +#define CR_TX_END 0x0004 +#define CR_CPU_RDY 0x0008 +#define SLAV_MODE_SEL 0x8000 + +/* REG_TCR Bit fields */ +#define TCR_STANDARD_MODE 0x0000 +#define TCR_MASTER_WRITE 0x0000 +#define TCR_HS_MODE 0x2000 +#define TCR_MASTER_READ 0x4000 +#define TCR_FAST_MODE 0x8000 +#define TCR_SLAVE_ADDR_MASK 0x007F + +/* REG_ISR Bit fields */ +#define ISR_NACK_ADDR 0x0001 +#define ISR_BYTE_END 0x0002 +#define ISR_SCL_TIMEOUT 0x0004 +#define ISR_WRITE_ALL 0x0007 + +/* REG_IMR Bit fields */ +#define IMR_ENABLE_ALL 0x0007 + +/* REG_CSR Bit fields */ +#define CSR_RCV_NOT_ACK 0x0001 +#define CSR_RCV_ACK_MASK 0x0001 +#define CSR_READY_MASK 0x0002 + +#define WMT_I2C_TIMEOUT (msecs_to_jiffies(1000)) + +struct wmt_i2c_dev { + struct i2c_adapter adapter; + struct completion complete; + struct device *dev; + void __iomem *base; + struct clk *clk; + u16 tcr; + int irq; + u16 cmd_status; +}; + +int wmt_i2c_wait_bus_not_busy(struct wmt_i2c_dev *i2c_dev); +int wmt_check_status(struct wmt_i2c_dev *i2c_dev); +int wmt_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num); +int wmt_i2c_init(struct platform_device *pdev, struct wmt_i2c_dev **pi2c_dev); + +#endif diff --git a/drivers/i2c/busses/i2c-viai2c-wmt.c b/drivers/i2c/busses/i2c-viai2c-wmt.c new file mode 100644 index 000000000000..3125374cc2c0 --- /dev/null +++ b/drivers/i2c/busses/i2c-viai2c-wmt.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Wondermedia I2C Master Mode Driver + * + * Copyright (C) 2012 Tony Prisk + * + * Derived from GPLv2+ licensed source: + * - Copyright (C) 2008 WonderMedia Technologies, Inc. + */ + +#include +#include +#include +#include "i2c-viai2c-common.h" + +#define REG_SLAVE_CR 0x10 +#define REG_SLAVE_SR 0x12 +#define REG_SLAVE_ISR 0x14 +#define REG_SLAVE_IMR 0x16 +#define REG_SLAVE_DR 0x18 +#define REG_SLAVE_TR 0x1A + +/* REG_TR */ +#define SCL_TIMEOUT(x) (((x) & 0xFF) << 8) +#define TR_STD 0x0064 +#define TR_HS 0x0019 + +/* REG_MCR */ +#define MCR_APB_96M 7 +#define MCR_APB_166M 12 + +static u32 wmt_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_NOSTART; +} + +static const struct i2c_algorithm wmt_i2c_algo = { + .master_xfer = wmt_i2c_xfer, + .functionality = wmt_i2c_func, +}; + +static int wmt_i2c_reset_hardware(struct wmt_i2c_dev *i2c_dev) +{ + int err; + + err = clk_prepare_enable(i2c_dev->clk); + if (err) { + dev_err(i2c_dev->dev, "failed to enable clock\n"); + return err; + } + + err = clk_set_rate(i2c_dev->clk, 20000000); + if (err) { + dev_err(i2c_dev->dev, "failed to set clock = 20Mhz\n"); + clk_disable_unprepare(i2c_dev->clk); + return err; + } + + writew(0, i2c_dev->base + REG_CR); + writew(MCR_APB_166M, i2c_dev->base + REG_MCR); + writew(ISR_WRITE_ALL, i2c_dev->base + REG_ISR); + writew(IMR_ENABLE_ALL, i2c_dev->base + REG_IMR); + writew(CR_ENABLE, i2c_dev->base + REG_CR); + readw(i2c_dev->base + REG_CSR); /* read clear */ + writew(ISR_WRITE_ALL, i2c_dev->base + REG_ISR); + + if (i2c_dev->tcr == TCR_FAST_MODE) + writew(SCL_TIMEOUT(128) | TR_HS, i2c_dev->base + REG_TR); + else + writew(SCL_TIMEOUT(128) | TR_STD, i2c_dev->base + REG_TR); + + return 0; +} + +static int wmt_i2c_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct wmt_i2c_dev *i2c_dev; + struct i2c_adapter *adap; + int err; + u32 clk_rate; + + err = wmt_i2c_init(pdev, &i2c_dev); + if (err) + return err; + + i2c_dev->clk = of_clk_get(np, 0); + if (IS_ERR(i2c_dev->clk)) { + dev_err(&pdev->dev, "unable to request clock\n"); + return PTR_ERR(i2c_dev->clk); + } + + err = of_property_read_u32(np, "clock-frequency", &clk_rate); + if (!err && clk_rate == I2C_MAX_FAST_MODE_FREQ) + i2c_dev->tcr = TCR_FAST_MODE; + + adap = &i2c_dev->adapter; + i2c_set_adapdata(adap, i2c_dev); + strscpy(adap->name, "WMT I2C adapter", sizeof(adap->name)); + adap->owner = THIS_MODULE; + adap->algo = &wmt_i2c_algo; + adap->dev.parent = &pdev->dev; + adap->dev.of_node = pdev->dev.of_node; + + err = wmt_i2c_reset_hardware(i2c_dev); + if (err) { + dev_err(&pdev->dev, "error initializing hardware\n"); + return err; + } + + err = i2c_add_adapter(adap); + if (err) + /* wmt_i2c_reset_hardware() enables i2c_dev->clk */ + clk_disable_unprepare(i2c_dev->clk); + + return err; +} + +static void wmt_i2c_remove(struct platform_device *pdev) +{ + struct wmt_i2c_dev *i2c_dev = platform_get_drvdata(pdev); + + /* Disable interrupts, clock and delete adapter */ + writew(0, i2c_dev->base + REG_IMR); + clk_disable_unprepare(i2c_dev->clk); + i2c_del_adapter(&i2c_dev->adapter); +} + +static const struct of_device_id wmt_i2c_dt_ids[] = { + { .compatible = "wm,wm8505-i2c" }, + { /* Sentinel */ }, +}; + +static struct platform_driver wmt_i2c_driver = { + .probe = wmt_i2c_probe, + .remove_new = wmt_i2c_remove, + .driver = { + .name = "wmt-i2c", + .of_match_table = wmt_i2c_dt_ids, + }, +}; + +module_platform_driver(wmt_i2c_driver); + +MODULE_DESCRIPTION("Wondermedia I2C master-mode bus adapter"); +MODULE_AUTHOR("Tony Prisk "); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(of, wmt_i2c_dt_ids); diff --git a/drivers/i2c/busses/i2c-wmt.c b/drivers/i2c/busses/i2c-wmt.c deleted file mode 100644 index 76ede433f65c..000000000000 --- a/drivers/i2c/busses/i2c-wmt.c +++ /dev/null @@ -1,430 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Wondermedia I2C Master Mode Driver - * - * Copyright (C) 2012 Tony Prisk - * - * Derived from GPLv2+ licensed source: - * - Copyright (C) 2008 WonderMedia Technologies, Inc. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#define REG_CR 0x00 -#define REG_TCR 0x02 -#define REG_CSR 0x04 -#define REG_ISR 0x06 -#define REG_IMR 0x08 -#define REG_CDR 0x0A -#define REG_TR 0x0C -#define REG_MCR 0x0E -#define REG_SLAVE_CR 0x10 -#define REG_SLAVE_SR 0x12 -#define REG_SLAVE_ISR 0x14 -#define REG_SLAVE_IMR 0x16 -#define REG_SLAVE_DR 0x18 -#define REG_SLAVE_TR 0x1A - -/* REG_CR Bit fields */ -#define CR_TX_NEXT_ACK 0x0000 -#define CR_ENABLE 0x0001 -#define CR_TX_NEXT_NO_ACK 0x0002 -#define CR_TX_END 0x0004 -#define CR_CPU_RDY 0x0008 -#define SLAV_MODE_SEL 0x8000 - -/* REG_TCR Bit fields */ -#define TCR_STANDARD_MODE 0x0000 -#define TCR_MASTER_WRITE 0x0000 -#define TCR_HS_MODE 0x2000 -#define TCR_MASTER_READ 0x4000 -#define TCR_FAST_MODE 0x8000 -#define TCR_SLAVE_ADDR_MASK 0x007F - -/* REG_ISR Bit fields */ -#define ISR_NACK_ADDR 0x0001 -#define ISR_BYTE_END 0x0002 -#define ISR_SCL_TIMEOUT 0x0004 -#define ISR_WRITE_ALL 0x0007 - -/* REG_IMR Bit fields */ -#define IMR_ENABLE_ALL 0x0007 - -/* REG_CSR Bit fields */ -#define CSR_RCV_NOT_ACK 0x0001 -#define CSR_RCV_ACK_MASK 0x0001 -#define CSR_READY_MASK 0x0002 - -/* REG_TR */ -#define SCL_TIMEOUT(x) (((x) & 0xFF) << 8) -#define TR_STD 0x0064 -#define TR_HS 0x0019 - -/* REG_MCR */ -#define MCR_APB_96M 7 -#define MCR_APB_166M 12 - -#define WMT_I2C_TIMEOUT (msecs_to_jiffies(1000)) - -struct wmt_i2c_dev { - struct i2c_adapter adapter; - struct completion complete; - struct device *dev; - void __iomem *base; - struct clk *clk; - u16 tcr; - int irq; - u16 cmd_status; -}; - -static int wmt_i2c_wait_bus_not_busy(struct wmt_i2c_dev *i2c_dev) -{ - unsigned long timeout; - - timeout = jiffies + WMT_I2C_TIMEOUT; - while (!(readw(i2c_dev->base + REG_CSR) & CSR_READY_MASK)) { - if (time_after(jiffies, timeout)) { - dev_warn(i2c_dev->dev, "timeout waiting for bus ready\n"); - return -EBUSY; - } - msleep(20); - } - - return 0; -} - -static int wmt_check_status(struct wmt_i2c_dev *i2c_dev) -{ - int ret = 0; - unsigned long wait_result; - - wait_result = wait_for_completion_timeout(&i2c_dev->complete, - msecs_to_jiffies(500)); - if (!wait_result) - return -ETIMEDOUT; - - if (i2c_dev->cmd_status & ISR_NACK_ADDR) - ret = -EIO; - - if (i2c_dev->cmd_status & ISR_SCL_TIMEOUT) - ret = -ETIMEDOUT; - - return ret; -} - -static int wmt_i2c_write(struct wmt_i2c_dev *i2c_dev, struct i2c_msg *pmsg, - int last) -{ - u16 val, tcr_val = i2c_dev->tcr; - int ret; - int xfer_len = 0; - - if (pmsg->len == 0) { - /* - * We still need to run through the while (..) once, so - * start at -1 and break out early from the loop - */ - xfer_len = -1; - writew(0, i2c_dev->base + REG_CDR); - } else { - writew(pmsg->buf[0] & 0xFF, i2c_dev->base + REG_CDR); - } - - if (!(pmsg->flags & I2C_M_NOSTART)) { - val = readw(i2c_dev->base + REG_CR); - val &= ~CR_TX_END; - val |= CR_CPU_RDY; - writew(val, i2c_dev->base + REG_CR); - } - - reinit_completion(&i2c_dev->complete); - - tcr_val |= (TCR_MASTER_WRITE | (pmsg->addr & TCR_SLAVE_ADDR_MASK)); - - writew(tcr_val, i2c_dev->base + REG_TCR); - - if (pmsg->flags & I2C_M_NOSTART) { - val = readw(i2c_dev->base + REG_CR); - val |= CR_CPU_RDY; - writew(val, i2c_dev->base + REG_CR); - } - - while (xfer_len < pmsg->len) { - ret = wmt_check_status(i2c_dev); - if (ret) - return ret; - - xfer_len++; - - val = readw(i2c_dev->base + REG_CSR); - if ((val & CSR_RCV_ACK_MASK) == CSR_RCV_NOT_ACK) { - dev_dbg(i2c_dev->dev, "write RCV NACK error\n"); - return -EIO; - } - - if (pmsg->len == 0) { - val = CR_TX_END | CR_CPU_RDY | CR_ENABLE; - writew(val, i2c_dev->base + REG_CR); - break; - } - - if (xfer_len == pmsg->len) { - if (last != 1) - writew(CR_ENABLE, i2c_dev->base + REG_CR); - } else { - writew(pmsg->buf[xfer_len] & 0xFF, i2c_dev->base + - REG_CDR); - writew(CR_CPU_RDY | CR_ENABLE, i2c_dev->base + REG_CR); - } - } - - return 0; -} - -static int wmt_i2c_read(struct wmt_i2c_dev *i2c_dev, struct i2c_msg *pmsg) -{ - u16 val, tcr_val = i2c_dev->tcr; - int ret; - u32 xfer_len = 0; - - val = readw(i2c_dev->base + REG_CR); - val &= ~(CR_TX_END | CR_TX_NEXT_NO_ACK); - - if (!(pmsg->flags & I2C_M_NOSTART)) - val |= CR_CPU_RDY; - - if (pmsg->len == 1) - val |= CR_TX_NEXT_NO_ACK; - - writew(val, i2c_dev->base + REG_CR); - - reinit_completion(&i2c_dev->complete); - - tcr_val |= TCR_MASTER_READ | (pmsg->addr & TCR_SLAVE_ADDR_MASK); - - writew(tcr_val, i2c_dev->base + REG_TCR); - - if (pmsg->flags & I2C_M_NOSTART) { - val = readw(i2c_dev->base + REG_CR); - val |= CR_CPU_RDY; - writew(val, i2c_dev->base + REG_CR); - } - - while (xfer_len < pmsg->len) { - ret = wmt_check_status(i2c_dev); - if (ret) - return ret; - - pmsg->buf[xfer_len] = readw(i2c_dev->base + REG_CDR) >> 8; - xfer_len++; - - val = readw(i2c_dev->base + REG_CR) | CR_CPU_RDY; - if (xfer_len == pmsg->len - 1) - val |= CR_TX_NEXT_NO_ACK; - writew(val, i2c_dev->base + REG_CR); - } - - return 0; -} - -static int wmt_i2c_xfer(struct i2c_adapter *adap, - struct i2c_msg msgs[], - int num) -{ - struct i2c_msg *pmsg; - int i; - int ret = 0; - struct wmt_i2c_dev *i2c_dev = i2c_get_adapdata(adap); - - for (i = 0; ret >= 0 && i < num; i++) { - pmsg = &msgs[i]; - if (!(pmsg->flags & I2C_M_NOSTART)) { - ret = wmt_i2c_wait_bus_not_busy(i2c_dev); - if (ret < 0) - return ret; - } - - if (pmsg->flags & I2C_M_RD) - ret = wmt_i2c_read(i2c_dev, pmsg); - else - ret = wmt_i2c_write(i2c_dev, pmsg, (i + 1) == num); - } - - return (ret < 0) ? ret : i; -} - -static u32 wmt_i2c_func(struct i2c_adapter *adap) -{ - return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_NOSTART; -} - -static const struct i2c_algorithm wmt_i2c_algo = { - .master_xfer = wmt_i2c_xfer, - .functionality = wmt_i2c_func, -}; - -static irqreturn_t wmt_i2c_isr(int irq, void *data) -{ - struct wmt_i2c_dev *i2c_dev = data; - - /* save the status and write-clear it */ - i2c_dev->cmd_status = readw(i2c_dev->base + REG_ISR); - writew(i2c_dev->cmd_status, i2c_dev->base + REG_ISR); - - complete(&i2c_dev->complete); - - return IRQ_HANDLED; -} - -static int wmt_i2c_init(struct platform_device *pdev, struct wmt_i2c_dev **pi2c_dev) -{ - int err; - struct wmt_i2c_dev *i2c_dev; - struct device_node *np = pdev->dev.of_node; - - i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL); - if (!i2c_dev) - return -ENOMEM; - - i2c_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); - if (IS_ERR(i2c_dev->base)) - return PTR_ERR(i2c_dev->base); - - i2c_dev->irq = irq_of_parse_and_map(np, 0); - if (!i2c_dev->irq) - return -EINVAL; - - err = devm_request_irq(&pdev->dev, i2c_dev->irq, wmt_i2c_isr, - 0, pdev->name, i2c_dev); - if (err) - return dev_err_probe(&pdev->dev, err, - "failed to request irq %i\n", i2c_dev->irq); - - i2c_dev->dev = &pdev->dev; - init_completion(&i2c_dev->complete); - platform_set_drvdata(pdev, i2c_dev); - - *pi2c_dev = i2c_dev; - return 0; -} - -static int wmt_i2c_reset_hardware(struct wmt_i2c_dev *i2c_dev) -{ - int err; - - err = clk_prepare_enable(i2c_dev->clk); - if (err) { - dev_err(i2c_dev->dev, "failed to enable clock\n"); - return err; - } - - err = clk_set_rate(i2c_dev->clk, 20000000); - if (err) { - dev_err(i2c_dev->dev, "failed to set clock = 20Mhz\n"); - clk_disable_unprepare(i2c_dev->clk); - return err; - } - - writew(0, i2c_dev->base + REG_CR); - writew(MCR_APB_166M, i2c_dev->base + REG_MCR); - writew(ISR_WRITE_ALL, i2c_dev->base + REG_ISR); - writew(IMR_ENABLE_ALL, i2c_dev->base + REG_IMR); - writew(CR_ENABLE, i2c_dev->base + REG_CR); - readw(i2c_dev->base + REG_CSR); /* read clear */ - writew(ISR_WRITE_ALL, i2c_dev->base + REG_ISR); - - if (i2c_dev->tcr == TCR_FAST_MODE) - writew(SCL_TIMEOUT(128) | TR_HS, i2c_dev->base + REG_TR); - else - writew(SCL_TIMEOUT(128) | TR_STD, i2c_dev->base + REG_TR); - - return 0; -} - -static int wmt_i2c_probe(struct platform_device *pdev) -{ - struct device_node *np = pdev->dev.of_node; - struct wmt_i2c_dev *i2c_dev; - struct i2c_adapter *adap; - int err; - u32 clk_rate; - - err = wmt_i2c_init(pdev, &i2c_dev); - if (err) - return err; - - i2c_dev->clk = of_clk_get(np, 0); - if (IS_ERR(i2c_dev->clk)) { - dev_err(&pdev->dev, "unable to request clock\n"); - return PTR_ERR(i2c_dev->clk); - } - - err = of_property_read_u32(np, "clock-frequency", &clk_rate); - if (!err && clk_rate == I2C_MAX_FAST_MODE_FREQ) - i2c_dev->tcr = TCR_FAST_MODE; - - adap = &i2c_dev->adapter; - i2c_set_adapdata(adap, i2c_dev); - strscpy(adap->name, "WMT I2C adapter", sizeof(adap->name)); - adap->owner = THIS_MODULE; - adap->algo = &wmt_i2c_algo; - adap->dev.parent = &pdev->dev; - adap->dev.of_node = pdev->dev.of_node; - - err = wmt_i2c_reset_hardware(i2c_dev); - if (err) { - dev_err(&pdev->dev, "error initializing hardware\n"); - return err; - } - - err = i2c_add_adapter(adap); - if (err) - goto err_disable_clk; - - return 0; - -err_disable_clk: - clk_disable_unprepare(i2c_dev->clk); - return err; -} - -static void wmt_i2c_remove(struct platform_device *pdev) -{ - struct wmt_i2c_dev *i2c_dev = platform_get_drvdata(pdev); - - /* Disable interrupts, clock and delete adapter */ - writew(0, i2c_dev->base + REG_IMR); - clk_disable_unprepare(i2c_dev->clk); - i2c_del_adapter(&i2c_dev->adapter); -} - -static const struct of_device_id wmt_i2c_dt_ids[] = { - { .compatible = "wm,wm8505-i2c" }, - { /* Sentinel */ }, -}; - -static struct platform_driver wmt_i2c_driver = { - .probe = wmt_i2c_probe, - .remove_new = wmt_i2c_remove, - .driver = { - .name = "wmt-i2c", - .of_match_table = wmt_i2c_dt_ids, - }, -}; - -module_platform_driver(wmt_i2c_driver); - -MODULE_DESCRIPTION("Wondermedia I2C master-mode bus adapter"); -MODULE_AUTHOR("Tony Prisk "); -MODULE_LICENSE("GPL"); -MODULE_DEVICE_TABLE(of, wmt_i2c_dt_ids);