[PATCH 09/22] i2c: remove i2c-sh7760

Christoph Hellwig
2023-01-13T06:27:47Z

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

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/i2c/busses/Kconfig | 9 -
drivers/i2c/busses/Makefile | 1 -
drivers/i2c/busses/i2c-sh7760.c | 565 --------------------------------
3 files changed, 575 deletions(-)
delete mode 100644 drivers/i2c/busses/i2c-sh7760.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 22602c512a6e50..44267a023fd19a 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -1016,15 +1016,6 @@ config I2C_S3C2410
Say Y here to include support for I2C controller in the
Samsung SoCs (S3C, S5Pv210, Exynos).

-config I2C_SH7760
- tristate "Renesas SH7760 I2C Controller"
- depends on CPU_SUBTYPE_SH7760
- help
- This driver supports the 2 I2C interfaces on the Renesas SH7760.
-
- This driver can also be built as a module. If so, the module
- will be called i2c-sh7760.
-
config I2C_SH_MOBILE
tristate "SuperH Mobile I2C Controller"
depends on ARCH_RENESAS || COMPILE_TEST
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index e73cdb1d2b5a85..6be213e5e4dd16 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -104,7 +104,6 @@ obj-$(CONFIG_I2C_RIIC) += i2c-riic.o
obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o
obj-$(CONFIG_I2C_RZV2M) += i2c-rzv2m.o
obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o
-obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o
obj-$(CONFIG_I2C_SH_MOBILE) += i2c-sh_mobile.o
obj-$(CONFIG_I2C_SIMTEC) += i2c-simtec.o
obj-$(CONFIG_I2C_SPRD) += i2c-sprd.o
diff --git a/drivers/i2c/busses/i2c-sh7760.c b/drivers/i2c/busses/i2c-sh7760.c
deleted file mode 100644
index 319d1fa617c883..00000000000000
--- a/drivers/i2c/busses/i2c-sh7760.c
+++ /dev/null
@@ -1,565 +0,0 @@
-/*
- * I2C bus driver for the SH7760 I2C Interfaces.
- *
- * (c) 2005-2008 MSC Vertriebsges.m.b.H, Manuel Lauss <mlau@msc-ge.com>
- *
- * licensed under the terms outlined in the file COPYING.
- *
- */
-
-#include <linux/completion.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/i2c.h>
-#include <linux/interrupt.h>
-#include <linux/ioport.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/io.h>
-#include <linux/module.h>
-
-#include <asm/clock.h>
-#include <asm/i2c-sh7760.h>
-
-/* register offsets */
-#define I2CSCR 0x0 /* slave ctrl */
-#define I2CMCR 0x4 /* master ctrl */
-#define I2CSSR 0x8 /* slave status */
-#define I2CMSR 0xC /* master status */
-#define I2CSIER 0x10 /* slave irq enable */
-#define I2CMIER 0x14 /* master irq enable */
-#define I2CCCR 0x18 /* clock dividers */
-#define I2CSAR 0x1c /* slave address */
-#define I2CMAR 0x20 /* master address */
-#define I2CRXTX 0x24 /* data port */
-#define I2CFCR 0x28 /* fifo control */
-#define I2CFSR 0x2C /* fifo status */
-#define I2CFIER 0x30 /* fifo irq enable */
-#define I2CRFDR 0x34 /* rx fifo count */
-#define I2CTFDR 0x38 /* tx fifo count */
-
-#define REGSIZE 0x3C
-
-#define MCR_MDBS 0x80 /* non-fifo mode switch */
-#define MCR_FSCL 0x40 /* override SCL pin */
-#define MCR_FSDA 0x20 /* override SDA pin */
-#define MCR_OBPC 0x10 /* override pins */
-#define MCR_MIE 0x08 /* master if enable */
-#define MCR_TSBE 0x04
-#define MCR_FSB 0x02 /* force stop bit */
-#define MCR_ESG 0x01 /* en startbit gen. */
-
-#define MSR_MNR 0x40 /* nack received */
-#define MSR_MAL 0x20 /* arbitration lost */
-#define MSR_MST 0x10 /* sent a stop */
-#define MSR_MDE 0x08
-#define MSR_MDT 0x04
-#define MSR_MDR 0x02
-#define MSR_MAT 0x01 /* slave addr xfer done */
-
-#define MIE_MNRE 0x40 /* nack irq en */
-#define MIE_MALE 0x20 /* arblos irq en */
-#define MIE_MSTE 0x10 /* stop irq en */
-#define MIE_MDEE 0x08
-#define MIE_MDTE 0x04
-#define MIE_MDRE 0x02
-#define MIE_MATE 0x01 /* address sent irq en */
-
-#define FCR_RFRST 0x02 /* reset rx fifo */
-#define FCR_TFRST 0x01 /* reset tx fifo */
-
-#define FSR_TEND 0x04 /* last byte sent */
-#define FSR_RDF 0x02 /* rx fifo trigger */
-#define FSR_TDFE 0x01 /* tx fifo empty */
-
-#define FIER_TEIE 0x04 /* tx fifo empty irq en */
-#define FIER_RXIE 0x02 /* rx fifo trig irq en */
-#define FIER_TXIE 0x01 /* tx fifo trig irq en */
-
-#define FIFO_SIZE 16
-
-struct cami2c {
- void __iomem *iobase;
- struct i2c_adapter adap;
-
- /* message processing */
- struct i2c_msg *msg;
-#define IDF_SEND 1
-#define IDF_RECV 2
-#define IDF_STOP 4
- int flags;
-
-#define IDS_DONE 1
-#define IDS_ARBLOST 2
-#define IDS_NACK 4
- int status;
- struct completion xfer_done;
-
- int irq;
- struct resource *ioarea;
-};
-
-static inline void OUT32(struct cami2c *cam, int reg, unsigned long val)
-{
- __raw_writel(val, (unsigned long)cam->iobase + reg);
-}
-
-static inline unsigned long IN32(struct cami2c *cam, int reg)
-{
- return __raw_readl((unsigned long)cam->iobase + reg);
-}
-
-static irqreturn_t sh7760_i2c_irq(int irq, void *ptr)
-{
- struct cami2c *id = ptr;
- struct i2c_msg *msg = id->msg;
- char *data = msg->buf;
- unsigned long msr, fsr, fier, len;
-
- msr = IN32(id, I2CMSR);
- fsr = IN32(id, I2CFSR);
-
- /* arbitration lost */
- if (msr & MSR_MAL) {
- OUT32(id, I2CMCR, 0);
- OUT32(id, I2CSCR, 0);
- OUT32(id, I2CSAR, 0);
- id->status |= IDS_DONE | IDS_ARBLOST;
- goto out;
- }
-
- if (msr & MSR_MNR) {
- /* NACK handling is very screwed up. After receiving a
- * NAK IRQ one has to wait a bit before writing to any
- * registers, or the ctl will lock up. After that delay
- * do a normal i2c stop. Then wait at least 1 ms before
- * attempting another transfer or ctl will stop working
- */
- udelay(100); /* wait or risk ctl hang */
- OUT32(id, I2CFCR, FCR_RFRST | FCR_TFRST);
- OUT32(id, I2CMCR, MCR_MIE | MCR_FSB);
- OUT32(id, I2CFIER, 0);
- OUT32(id, I2CMIER, MIE_MSTE);
- OUT32(id, I2CSCR, 0);
- OUT32(id, I2CSAR, 0);
- id->status |= IDS_NACK;
- msr &= ~MSR_MAT;
- fsr = 0;
- /* In some cases the MST bit is also set. */
- }
-
- /* i2c-stop was sent */
- if (msr & MSR_MST) {
- id->status |= IDS_DONE;
- goto out;
- }
-
- /* i2c slave addr was sent; set to "normal" operation */
- if (msr & MSR_MAT)
- OUT32(id, I2CMCR, MCR_MIE);
-
- fier = IN32(id, I2CFIER);
-
- if (fsr & FSR_RDF) {
- len = IN32(id, I2CRFDR);
- if (msg->len <= len) {
- if (id->flags & IDF_STOP) {
- OUT32(id, I2CMCR, MCR_MIE | MCR_FSB);
- OUT32(id, I2CFIER, 0);
- /* manual says: wait >= 0.5 SCL times */
- udelay(5);
- /* next int should be MST */
- } else {
- id->status |= IDS_DONE;
- /* keep the RDF bit: ctrl holds SCL low
- * until the setup for the next i2c_msg
- * clears this bit.
- */
- fsr &= ~FSR_RDF;
- }
- }
- while (msg->len && len) {
- *data++ = IN32(id, I2CRXTX);
- msg->len--;
- len--;
- }
-
- if (msg->len) {
- len = (msg->len >= FIFO_SIZE) ? FIFO_SIZE - 1
- : msg->len - 1;
-
- OUT32(id, I2CFCR, FCR_TFRST | ((len & 0xf) << 4));
- }
-
- } else if (id->flags & IDF_SEND) {
- if ((fsr & FSR_TEND) && (msg->len < 1)) {
- if (id->flags & IDF_STOP) {
- OUT32(id, I2CMCR, MCR_MIE | MCR_FSB);
- } else {
- id->status |= IDS_DONE;
- /* keep the TEND bit: ctl holds SCL low
- * until the setup for the next i2c_msg
- * clears this bit.
- */
- fsr &= ~FSR_TEND;
- }
- }
- if (fsr & FSR_TDFE) {
- while (msg->len && (IN32(id, I2CTFDR) < FIFO_SIZE)) {
- OUT32(id, I2CRXTX, *data++);
- msg->len--;
- }
-
- if (msg->len < 1) {
- fier &= ~FIER_TXIE;
- OUT32(id, I2CFIER, fier);
- } else {
- len = (msg->len >= FIFO_SIZE) ? 2 : 0;
- OUT32(id, I2CFCR,
- FCR_RFRST | ((len & 3) << 2));
- }
- }
- }
-out:
- if (id->status & IDS_DONE) {
- OUT32(id, I2CMIER, 0);
- OUT32(id, I2CFIER, 0);
- id->msg = NULL;
- complete(&id->xfer_done);
- }
- /* clear status flags and ctrl resumes work */
- OUT32(id, I2CMSR, ~msr);
- OUT32(id, I2CFSR, ~fsr);
- OUT32(id, I2CSSR, 0);
-
- return IRQ_HANDLED;
-}
-
-
-/* prepare and start a master receive operation */
-static void sh7760_i2c_mrecv(struct cami2c *id)
-{
- int len;
-
- id->flags |= IDF_RECV;
-
- /* set the slave addr reg; otherwise rcv wont work! */
- OUT32(id, I2CSAR, 0xfe);
- OUT32(id, I2CMAR, (id->msg->addr << 1) | 1);
-
- /* adjust rx fifo trigger */
- if (id->msg->len >= FIFO_SIZE)
- len = FIFO_SIZE - 1; /* trigger at fifo full */
- else
- len = id->msg->len - 1; /* trigger before all received */
-
- OUT32(id, I2CFCR, FCR_RFRST | FCR_TFRST);
- OUT32(id, I2CFCR, FCR_TFRST | ((len & 0xF) << 4));
-
- OUT32(id, I2CMSR, 0);
- OUT32(id, I2CMCR, MCR_MIE | MCR_ESG);
- OUT32(id, I2CMIER, MIE_MNRE | MIE_MALE | MIE_MSTE | MIE_MATE);
- OUT32(id, I2CFIER, FIER_RXIE);
-}
-
-/* prepare and start a master send operation */
-static void sh7760_i2c_msend(struct cami2c *id)
-{
- int len;
-
- id->flags |= IDF_SEND;
-
- /* set the slave addr reg; otherwise xmit wont work! */
- OUT32(id, I2CSAR, 0xfe);
- OUT32(id, I2CMAR, (id->msg->addr << 1) | 0);
-
- /* adjust tx fifo trigger */
- if (id->msg->len >= FIFO_SIZE)
- len = 2; /* trig: 2 bytes left in TX fifo */
- else
- len = 0; /* trig: 8 bytes left in TX fifo */
-
- OUT32(id, I2CFCR, FCR_RFRST | FCR_TFRST);
- OUT32(id, I2CFCR, FCR_RFRST | ((len & 3) << 2));
-
- while (id->msg->len && IN32(id, I2CTFDR) < FIFO_SIZE) {
- OUT32(id, I2CRXTX, *(id->msg->buf));
- (id->msg->len)--;
- (id->msg->buf)++;
- }
-
- OUT32(id, I2CMSR, 0);
- OUT32(id, I2CMCR, MCR_MIE | MCR_ESG);
- OUT32(id, I2CFSR, 0);
- OUT32(id, I2CMIER, MIE_MNRE | MIE_MALE | MIE_MSTE | MIE_MATE);
- OUT32(id, I2CFIER, FIER_TEIE | (id->msg->len ? FIER_TXIE : 0));
-}
-
-static inline int sh7760_i2c_busy_check(struct cami2c *id)
-{
- return (IN32(id, I2CMCR) & MCR_FSDA);
-}
-
-static int sh7760_i2c_master_xfer(struct i2c_adapter *adap,
- struct i2c_msg *msgs,
- int num)
-{
- struct cami2c *id = adap->algo_data;
- int i, retr;
-
- if (sh7760_i2c_busy_check(id)) {
- dev_err(&adap->dev, "sh7760-i2c%d: bus busy!\n", adap->nr);
- return -EBUSY;
- }
-
- i = 0;
- while (i < num) {
- retr = adap->retries;
-retry:
- id->flags = ((i == (num-1)) ? IDF_STOP : 0);
- id->status = 0;
- id->msg = msgs;
- init_completion(&id->xfer_done);
-
- if (msgs->flags & I2C_M_RD)
- sh7760_i2c_mrecv(id);
- else
- sh7760_i2c_msend(id);
-
- wait_for_completion(&id->xfer_done);
-
- if (id->status == 0) {
- num = -EIO;
- break;
- }
-
- if (id->status & IDS_NACK) {
- /* wait a bit or i2c module stops working */
- mdelay(1);
- num = -EREMOTEIO;
- break;
- }
-
- if (id->status & IDS_ARBLOST) {
- if (retr--) {
- mdelay(2);
- goto retry;
- }
- num = -EREMOTEIO;
- break;
- }
-
- msgs++;
- i++;
- }
-
- id->msg = NULL;
- id->flags = 0;
- id->status = 0;
-
- OUT32(id, I2CMCR, 0);
- OUT32(id, I2CMSR, 0);
- OUT32(id, I2CMIER, 0);
- OUT32(id, I2CFIER, 0);
-
- /* reset slave module registers too: master mode enables slave
- * module for receive ops (ack, data). Without this reset,
- * eternal bus activity might be reported after NACK / ARBLOST.
- */
- OUT32(id, I2CSCR, 0);
- OUT32(id, I2CSAR, 0);
- OUT32(id, I2CSSR, 0);
-
- return num;
-}
-
-static u32 sh7760_i2c_func(struct i2c_adapter *adap)
-{
- return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
-}
-
-static const struct i2c_algorithm sh7760_i2c_algo = {
- .master_xfer = sh7760_i2c_master_xfer,
- .functionality = sh7760_i2c_func,
-};
-
-/* calculate CCR register setting for a desired scl clock. SCL clock is
- * derived from I2C module clock (iclk) which in turn is derived from
- * peripheral module clock (mclk, usually around 33MHz):
- * iclk = mclk/(CDF + 1). iclk must be < 20MHz.
- * scl = iclk/(SCGD*8 + 20).
- */
-static int calc_CCR(unsigned long scl_hz)
-{
- struct clk *mclk;
- unsigned long mck, m1, dff, odff, iclk;
- signed char cdf, cdfm;
- int scgd, scgdm, scgds;
-
- mclk = clk_get(NULL, "peripheral_clk");
- if (IS_ERR(mclk)) {
- return PTR_ERR(mclk);
- } else {
- mck = mclk->rate;
- clk_put(mclk);
- }
-
- odff = scl_hz;
- scgdm = cdfm = m1 = 0;
- for (cdf = 3; cdf >= 0; cdf--) {
- iclk = mck / (1 + cdf);
- if (iclk >= 20000000)
- continue;
- scgds = ((iclk / scl_hz) - 20) >> 3;
- for (scgd = scgds; (scgd < 63) && scgd <= scgds + 1; scgd++) {
- m1 = iclk / (20 + (scgd << 3));
- dff = abs(scl_hz - m1);
- if (dff < odff) {
- odff = dff;
- cdfm = cdf;
- scgdm = scgd;
- }
- }
- }
- /* fail if more than 25% off of requested SCL */
- if (odff > (scl_hz >> 2))
- return -EINVAL;
-
- /* create a CCR register value */
- return ((scgdm << 2) | cdfm);
-}
-
-static int sh7760_i2c_probe(struct platform_device *pdev)
-{
- struct sh7760_i2c_platdata *pd;
- struct resource *res;
- struct cami2c *id;
- int ret;
-
- pd = dev_get_platdata(&pdev->dev);
- if (!pd) {
- dev_err(&pdev->dev, "no platform_data!\n");
- ret = -ENODEV;
- goto out0;
- }
-
- id = kzalloc(sizeof(struct cami2c), GFP_KERNEL);
- if (!id) {
- dev_err(&pdev->dev, "no mem for private data\n");
- ret = -ENOMEM;
- goto out0;
- }
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(&pdev->dev, "no mmio resources\n");
- ret = -ENODEV;
- goto out1;
- }
-
- id->ioarea = request_mem_region(res->start, REGSIZE, pdev->name);
- if (!id->ioarea) {
- dev_err(&pdev->dev, "mmio already reserved\n");
- ret = -EBUSY;
- goto out1;
- }
-
- id->iobase = ioremap(res->start, REGSIZE);
- if (!id->iobase) {
- dev_err(&pdev->dev, "cannot ioremap\n");
- ret = -ENODEV;
- goto out2;
- }
-
- ret = platform_get_irq(pdev, 0);
- if (ret < 0)
- goto out3;
- id->irq = ret;
-
- id->adap.nr = pdev->id;
- id->adap.algo = &sh7760_i2c_algo;
- id->adap.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
- id->adap.retries = 3;
- id->adap.algo_data = id;
- id->adap.dev.parent = &pdev->dev;
- snprintf(id->adap.name, sizeof(id->adap.name),
- "SH7760 I2C at %08lx", (unsigned long)res->start);
-
- OUT32(id, I2CMCR, 0);
- OUT32(id, I2CMSR, 0);
- OUT32(id, I2CMIER, 0);
- OUT32(id, I2CMAR, 0);
- OUT32(id, I2CSIER, 0);
- OUT32(id, I2CSAR, 0);
- OUT32(id, I2CSCR, 0);
- OUT32(id, I2CSSR, 0);
- OUT32(id, I2CFIER, 0);
- OUT32(id, I2CFCR, FCR_RFRST | FCR_TFRST);
- OUT32(id, I2CFSR, 0);
-
- ret = calc_CCR(pd->speed_khz * 1000);
- if (ret < 0) {
- dev_err(&pdev->dev, "invalid SCL clock: %dkHz\n",
- pd->speed_khz);
- goto out3;
- }
- OUT32(id, I2CCCR, ret);
-
- if (request_irq(id->irq, sh7760_i2c_irq, 0,
- SH7760_I2C_DEVNAME, id)) {
- dev_err(&pdev->dev, "cannot get irq %d\n", id->irq);
- ret = -EBUSY;
- goto out3;
- }
-
- ret = i2c_add_numbered_adapter(&id->adap);
- if (ret < 0)
- goto out4;
-
- platform_set_drvdata(pdev, id);
-
- dev_info(&pdev->dev, "%d kHz mmio %08x irq %d\n",
- pd->speed_khz, res->start, id->irq);
-
- return 0;
-
-out4:
- free_irq(id->irq, id);
-out3:
- iounmap(id->iobase);
-out2:
- release_resource(id->ioarea);
- kfree(id->ioarea);
-out1:
- kfree(id);
-out0:
- return ret;
-}
-
-static int sh7760_i2c_remove(struct platform_device *pdev)
-{
- struct cami2c *id = platform_get_drvdata(pdev);
-
- i2c_del_adapter(&id->adap);
- free_irq(id->irq, id);
- iounmap(id->iobase);
- release_resource(id->ioarea);
- kfree(id->ioarea);
- kfree(id);
-
- return 0;
-}
-
-static struct platform_driver sh7760_i2c_drv = {
- .driver = {
- .name = SH7760_I2C_DEVNAME,
- },
- .probe = sh7760_i2c_probe,
- .remove = sh7760_i2c_remove,
-};
-
-module_platform_driver(sh7760_i2c_drv);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("SH7760 I2C bus driver");
-MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");
--
2.39.0