diff options
author | Rob Herring <robh@kernel.org> | 2021-11-09 19:16:19 +0300 |
---|---|---|
committer | Wolfram Sang <wsa@kernel.org> | 2021-11-23 12:00:29 +0300 |
commit | 77e0164630364ebd738f8cc1858f41e655acf38c (patch) | |
tree | bf68c0728476001f6c8124e90163f517ec210aed /drivers/i2c | |
parent | ef99066c7dede6ed2b67661308c3f22d526afcdb (diff) |
i2c: Remove unused Netlogic/Sigma Designs XLR driver
Commits 95b8a5e0111a ("MIPS: Remove NETLOGIC support") and edd4488aea9c
("ARM: remove tango platform") removed Netlogic XLR and Sigma Designs
Tango platforms which means there are no platforms using the XLR I2C
driver and it can be removed.
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c')
-rw-r--r-- | drivers/i2c/busses/Kconfig | 10 | ||||
-rw-r--r-- | drivers/i2c/busses/Makefile | 1 | ||||
-rw-r--r-- | drivers/i2c/busses/i2c-xlr.c | 470 |
3 files changed, 0 insertions, 481 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index e9dd1640ffde..2f0a440ec446 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -1159,16 +1159,6 @@ config I2C_XILINX This driver can also be built as a module. If so, the module will be called xilinx_i2c. -config I2C_XLR - tristate "Netlogic XLR I2C support" - depends on CPU_XLR || COMPILE_TEST - help - This driver enables support for the on-chip I2C interface of - the Netlogic XLR/XLS MIPS processors and Sigma Designs SOCs. - - This driver can also be built as a module. If so, the module - will be called i2c-xlr. - config I2C_XLP9XX tristate "Cavium ThunderX2 I2C support" depends on ARCH_THUNDER2 || COMPILE_TEST diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index d85899fef8c7..1d00dce77098 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -119,7 +119,6 @@ obj-$(CONFIG_I2C_OCTEON) += i2c-octeon.o i2c-thunderx-objs := i2c-octeon-core.o i2c-thunderx-pcidrv.o obj-$(CONFIG_I2C_THUNDERX) += i2c-thunderx.o obj-$(CONFIG_I2C_XILINX) += i2c-xiic.o -obj-$(CONFIG_I2C_XLR) += i2c-xlr.o obj-$(CONFIG_I2C_XLP9XX) += i2c-xlp9xx.o obj-$(CONFIG_I2C_RCAR) += i2c-rcar.o diff --git a/drivers/i2c/busses/i2c-xlr.c b/drivers/i2c/busses/i2c-xlr.c deleted file mode 100644 index 9ce20652d494..000000000000 --- a/drivers/i2c/busses/i2c-xlr.c +++ /dev/null @@ -1,470 +0,0 @@ -/* - * Copyright 2011, Netlogic Microsystems Inc. - * Copyright 2004, Matt Porter <mporter@kernel.crashing.org> - * - * This file is licensed under the terms of the GNU General Public - * License version 2. This program is licensed "as is" without any - * warranty of any kind, whether express or implied. - */ - -#include <linux/err.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/ioport.h> -#include <linux/delay.h> -#include <linux/errno.h> -#include <linux/i2c.h> -#include <linux/io.h> -#include <linux/platform_device.h> -#include <linux/of_device.h> -#include <linux/clk.h> -#include <linux/interrupt.h> -#include <linux/wait.h> - -/* XLR I2C REGISTERS */ -#define XLR_I2C_CFG 0x00 -#define XLR_I2C_CLKDIV 0x01 -#define XLR_I2C_DEVADDR 0x02 -#define XLR_I2C_ADDR 0x03 -#define XLR_I2C_DATAOUT 0x04 -#define XLR_I2C_DATAIN 0x05 -#define XLR_I2C_STATUS 0x06 -#define XLR_I2C_STARTXFR 0x07 -#define XLR_I2C_BYTECNT 0x08 -#define XLR_I2C_HDSTATIM 0x09 - -/* Sigma Designs additional registers */ -#define XLR_I2C_INT_EN 0x09 -#define XLR_I2C_INT_STAT 0x0a - -/* XLR I2C REGISTERS FLAGS */ -#define XLR_I2C_BUS_BUSY 0x01 -#define XLR_I2C_SDOEMPTY 0x02 -#define XLR_I2C_RXRDY 0x04 -#define XLR_I2C_ACK_ERR 0x08 -#define XLR_I2C_ARB_STARTERR 0x30 - -/* Register Values */ -#define XLR_I2C_CFG_ADDR 0xF8 -#define XLR_I2C_CFG_NOADDR 0xFA -#define XLR_I2C_STARTXFR_ND 0x02 /* No Data */ -#define XLR_I2C_STARTXFR_RD 0x01 /* Read */ -#define XLR_I2C_STARTXFR_WR 0x00 /* Write */ - -#define XLR_I2C_TIMEOUT 10 /* timeout per byte in msec */ - -/* - * On XLR/XLS, we need to use __raw_ IO to read the I2C registers - * because they are in the big-endian MMIO area on the SoC. - * - * The readl/writel implementation on XLR/XLS byteswaps, because - * those are for its little-endian PCI space (see arch/mips/Kconfig). - */ -static inline void xlr_i2c_wreg(u32 __iomem *base, unsigned int reg, u32 val) -{ - __raw_writel(val, base + reg); -} - -static inline u32 xlr_i2c_rdreg(u32 __iomem *base, unsigned int reg) -{ - return __raw_readl(base + reg); -} - -#define XLR_I2C_FLAG_IRQ 1 - -struct xlr_i2c_config { - u32 flags; /* optional feature support */ - u32 status_busy; /* value of STATUS[0] when busy */ - u32 cfg_extra; /* extra CFG bits to set */ -}; - -struct xlr_i2c_private { - struct i2c_adapter adap; - u32 __iomem *iobase; - int irq; - int pos; - struct i2c_msg *msg; - const struct xlr_i2c_config *cfg; - wait_queue_head_t wait; - struct clk *clk; -}; - -static int xlr_i2c_busy(struct xlr_i2c_private *priv, u32 status) -{ - return (status & XLR_I2C_BUS_BUSY) == priv->cfg->status_busy; -} - -static int xlr_i2c_idle(struct xlr_i2c_private *priv) -{ - return !xlr_i2c_busy(priv, xlr_i2c_rdreg(priv->iobase, XLR_I2C_STATUS)); -} - -static int xlr_i2c_wait(struct xlr_i2c_private *priv, unsigned long timeout) -{ - int status; - int t; - - t = wait_event_timeout(priv->wait, xlr_i2c_idle(priv), - msecs_to_jiffies(timeout)); - if (!t) - return -ETIMEDOUT; - - status = xlr_i2c_rdreg(priv->iobase, XLR_I2C_STATUS); - - return status & XLR_I2C_ACK_ERR ? -EIO : 0; -} - -static void xlr_i2c_tx_irq(struct xlr_i2c_private *priv, u32 status) -{ - struct i2c_msg *msg = priv->msg; - - if (status & XLR_I2C_SDOEMPTY) - xlr_i2c_wreg(priv->iobase, XLR_I2C_DATAOUT, - msg->buf[priv->pos++]); -} - -static void xlr_i2c_rx_irq(struct xlr_i2c_private *priv, u32 status) -{ - struct i2c_msg *msg = priv->msg; - - if (status & XLR_I2C_RXRDY) - msg->buf[priv->pos++] = - xlr_i2c_rdreg(priv->iobase, XLR_I2C_DATAIN); -} - -static irqreturn_t xlr_i2c_irq(int irq, void *dev_id) -{ - struct xlr_i2c_private *priv = dev_id; - struct i2c_msg *msg = priv->msg; - u32 int_stat, status; - - int_stat = xlr_i2c_rdreg(priv->iobase, XLR_I2C_INT_STAT); - if (!int_stat) - return IRQ_NONE; - - xlr_i2c_wreg(priv->iobase, XLR_I2C_INT_STAT, int_stat); - - if (!msg) - return IRQ_HANDLED; - - status = xlr_i2c_rdreg(priv->iobase, XLR_I2C_STATUS); - - if (priv->pos < msg->len) { - if (msg->flags & I2C_M_RD) - xlr_i2c_rx_irq(priv, status); - else - xlr_i2c_tx_irq(priv, status); - } - - if (!xlr_i2c_busy(priv, status)) - wake_up(&priv->wait); - - return IRQ_HANDLED; -} - -static int xlr_i2c_tx(struct xlr_i2c_private *priv, u16 len, - u8 *buf, u16 addr) -{ - struct i2c_adapter *adap = &priv->adap; - unsigned long timeout, stoptime, checktime; - u32 i2c_status; - int pos, timedout; - u8 offset; - u32 xfer; - - offset = buf[0]; - xlr_i2c_wreg(priv->iobase, XLR_I2C_ADDR, offset); - xlr_i2c_wreg(priv->iobase, XLR_I2C_DEVADDR, addr); - xlr_i2c_wreg(priv->iobase, XLR_I2C_CFG, - XLR_I2C_CFG_ADDR | priv->cfg->cfg_extra); - - timeout = msecs_to_jiffies(XLR_I2C_TIMEOUT); - stoptime = jiffies + timeout; - timedout = 0; - - if (len == 1) { - xlr_i2c_wreg(priv->iobase, XLR_I2C_BYTECNT, len - 1); - xfer = XLR_I2C_STARTXFR_ND; - pos = 1; - } else { - xlr_i2c_wreg(priv->iobase, XLR_I2C_BYTECNT, len - 2); - xlr_i2c_wreg(priv->iobase, XLR_I2C_DATAOUT, buf[1]); - xfer = XLR_I2C_STARTXFR_WR; - pos = 2; - } - - priv->pos = pos; - -retry: - /* retry can only happen on the first byte */ - xlr_i2c_wreg(priv->iobase, XLR_I2C_STARTXFR, xfer); - - if (priv->irq > 0) - return xlr_i2c_wait(priv, XLR_I2C_TIMEOUT * len); - - while (!timedout) { - checktime = jiffies; - i2c_status = xlr_i2c_rdreg(priv->iobase, XLR_I2C_STATUS); - - if ((i2c_status & XLR_I2C_SDOEMPTY) && pos < len) { - xlr_i2c_wreg(priv->iobase, XLR_I2C_DATAOUT, buf[pos++]); - - /* reset timeout on successful xmit */ - stoptime = jiffies + timeout; - } - timedout = time_after(checktime, stoptime); - - if (i2c_status & XLR_I2C_ARB_STARTERR) { - if (timedout) - break; - goto retry; - } - - if (i2c_status & XLR_I2C_ACK_ERR) - return -EIO; - - if (!xlr_i2c_busy(priv, i2c_status) && pos >= len) - return 0; - } - dev_err(&adap->dev, "I2C transmit timeout\n"); - return -ETIMEDOUT; -} - -static int xlr_i2c_rx(struct xlr_i2c_private *priv, u16 len, u8 *buf, u16 addr) -{ - struct i2c_adapter *adap = &priv->adap; - u32 i2c_status; - unsigned long timeout, stoptime, checktime; - int nbytes, timedout; - - xlr_i2c_wreg(priv->iobase, XLR_I2C_CFG, - XLR_I2C_CFG_NOADDR | priv->cfg->cfg_extra); - xlr_i2c_wreg(priv->iobase, XLR_I2C_BYTECNT, len - 1); - xlr_i2c_wreg(priv->iobase, XLR_I2C_DEVADDR, addr); - - priv->pos = 0; - - timeout = msecs_to_jiffies(XLR_I2C_TIMEOUT); - stoptime = jiffies + timeout; - timedout = 0; - nbytes = 0; -retry: - xlr_i2c_wreg(priv->iobase, XLR_I2C_STARTXFR, XLR_I2C_STARTXFR_RD); - - if (priv->irq > 0) - return xlr_i2c_wait(priv, XLR_I2C_TIMEOUT * len); - - while (!timedout) { - checktime = jiffies; - i2c_status = xlr_i2c_rdreg(priv->iobase, XLR_I2C_STATUS); - if (i2c_status & XLR_I2C_RXRDY) { - if (nbytes >= len) - return -EIO; /* should not happen */ - - buf[nbytes++] = - xlr_i2c_rdreg(priv->iobase, XLR_I2C_DATAIN); - - /* reset timeout on successful read */ - stoptime = jiffies + timeout; - } - - timedout = time_after(checktime, stoptime); - if (i2c_status & XLR_I2C_ARB_STARTERR) { - if (timedout) - break; - goto retry; - } - - if (i2c_status & XLR_I2C_ACK_ERR) - return -EIO; - - if (!xlr_i2c_busy(priv, i2c_status)) - return 0; - } - - dev_err(&adap->dev, "I2C receive timeout\n"); - return -ETIMEDOUT; -} - -static int xlr_i2c_xfer(struct i2c_adapter *adap, - struct i2c_msg *msgs, int num) -{ - struct i2c_msg *msg; - int i; - int ret = 0; - struct xlr_i2c_private *priv = i2c_get_adapdata(adap); - - ret = clk_enable(priv->clk); - if (ret) - return ret; - - if (priv->irq) - xlr_i2c_wreg(priv->iobase, XLR_I2C_INT_EN, 0xf); - - - for (i = 0; ret == 0 && i < num; i++) { - msg = &msgs[i]; - priv->msg = msg; - if (msg->flags & I2C_M_RD) - ret = xlr_i2c_rx(priv, msg->len, &msg->buf[0], - msg->addr); - else - ret = xlr_i2c_tx(priv, msg->len, &msg->buf[0], - msg->addr); - } - - if (priv->irq) - xlr_i2c_wreg(priv->iobase, XLR_I2C_INT_EN, 0); - - clk_disable(priv->clk); - priv->msg = NULL; - - return (ret != 0) ? ret : num; -} - -static u32 xlr_func(struct i2c_adapter *adap) -{ - /* Emulate SMBUS over I2C */ - return (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) | I2C_FUNC_I2C; -} - -static const struct i2c_algorithm xlr_i2c_algo = { - .master_xfer = xlr_i2c_xfer, - .functionality = xlr_func, -}; - -static const struct i2c_adapter_quirks xlr_i2c_quirks = { - .flags = I2C_AQ_NO_ZERO_LEN, -}; - -static const struct xlr_i2c_config xlr_i2c_config_default = { - .status_busy = XLR_I2C_BUS_BUSY, - .cfg_extra = 0, -}; - -static const struct xlr_i2c_config xlr_i2c_config_tangox = { - .flags = XLR_I2C_FLAG_IRQ, - .status_busy = 0, - .cfg_extra = 1 << 8, -}; - -static const struct of_device_id xlr_i2c_dt_ids[] = { - { - .compatible = "sigma,smp8642-i2c", - .data = &xlr_i2c_config_tangox, - }, - { } -}; -MODULE_DEVICE_TABLE(of, xlr_i2c_dt_ids); - -static int xlr_i2c_probe(struct platform_device *pdev) -{ - const struct of_device_id *match; - struct xlr_i2c_private *priv; - struct clk *clk; - unsigned long clk_rate; - unsigned long clk_div; - u32 busfreq; - int irq; - int ret; - - priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); - if (!priv) - return -ENOMEM; - - match = of_match_device(xlr_i2c_dt_ids, &pdev->dev); - if (match) - priv->cfg = match->data; - else - priv->cfg = &xlr_i2c_config_default; - - priv->iobase = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(priv->iobase)) - return PTR_ERR(priv->iobase); - - irq = platform_get_irq(pdev, 0); - - if (irq > 0 && (priv->cfg->flags & XLR_I2C_FLAG_IRQ)) { - priv->irq = irq; - - xlr_i2c_wreg(priv->iobase, XLR_I2C_INT_EN, 0); - xlr_i2c_wreg(priv->iobase, XLR_I2C_INT_STAT, 0xf); - - ret = devm_request_irq(&pdev->dev, priv->irq, xlr_i2c_irq, - IRQF_SHARED, dev_name(&pdev->dev), - priv); - if (ret) - return ret; - - init_waitqueue_head(&priv->wait); - } - - if (of_property_read_u32(pdev->dev.of_node, "clock-frequency", - &busfreq)) - busfreq = I2C_MAX_STANDARD_MODE_FREQ; - - clk = devm_clk_get(&pdev->dev, NULL); - if (!IS_ERR(clk)) { - ret = clk_prepare_enable(clk); - if (ret) - return ret; - - clk_rate = clk_get_rate(clk); - clk_div = DIV_ROUND_UP(clk_rate, 2 * busfreq); - xlr_i2c_wreg(priv->iobase, XLR_I2C_CLKDIV, clk_div); - - clk_disable(clk); - priv->clk = clk; - } - - priv->adap.dev.parent = &pdev->dev; - priv->adap.dev.of_node = pdev->dev.of_node; - priv->adap.owner = THIS_MODULE; - priv->adap.algo_data = priv; - priv->adap.algo = &xlr_i2c_algo; - priv->adap.quirks = &xlr_i2c_quirks; - priv->adap.nr = pdev->id; - priv->adap.class = I2C_CLASS_HWMON; - snprintf(priv->adap.name, sizeof(priv->adap.name), "xlr-i2c"); - - i2c_set_adapdata(&priv->adap, priv); - ret = i2c_add_numbered_adapter(&priv->adap); - if (ret < 0) - goto err_unprepare_clk; - - platform_set_drvdata(pdev, priv); - dev_info(&priv->adap.dev, "Added I2C Bus.\n"); - return 0; - -err_unprepare_clk: - clk_unprepare(clk); - return ret; -} - -static int xlr_i2c_remove(struct platform_device *pdev) -{ - struct xlr_i2c_private *priv; - - priv = platform_get_drvdata(pdev); - i2c_del_adapter(&priv->adap); - clk_unprepare(priv->clk); - - return 0; -} - -static struct platform_driver xlr_i2c_driver = { - .probe = xlr_i2c_probe, - .remove = xlr_i2c_remove, - .driver = { - .name = "xlr-i2cbus", - .of_match_table = xlr_i2c_dt_ids, - }, -}; - -module_platform_driver(xlr_i2c_driver); - -MODULE_AUTHOR("Ganesan Ramalingam <ganesanr@netlogicmicro.com>"); -MODULE_DESCRIPTION("XLR/XLS SoC I2C Controller driver"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:xlr-i2cbus"); |