* [PATCH] MIPS/I2C: Move SEAD3 I2C driver to where it belongs.
[not found] ` <20141023181925.GA6719-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>
@ 2014-10-24 12:26 ` Ralf Baechle
[not found] ` <20141024122656.GC12641-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Ralf Baechle @ 2014-10-24 12:26 UTC (permalink / raw)
To: Markos Chandras, Wolfram Sang, linux-i2c-u79uwXL29TY76Z2rM5mHXA
Cc: linux-mips-6z/3iImG2C8G8FEW9MqTrA, Chris Dearman
Fixes the following build problem if CONFIG_I2C is disabled:
arch/mips/mti-sead3/sead3-pic32-i2c-drv.c: In function 'i2c_platform_probe':
arch/mips/mti-sead3/sead3-pic32-i2c-drv.c:345:2: error: implicit declaration of
function 'i2c_add_numbered_adapter' [-Werror=implicit-function-declaration]
ret = i2c_add_numbered_adapter(&priv->adap);
^
arch/mips/mti-sead3/sead3-pic32-i2c-drv.c: In function
'i2c_platform_remove':
arch/mips/mti-sead3/sead3-pic32-i2c-drv.c:361:2: error: implicit declaration
of function 'i2c_del_adapter' [-Werror=implicit-function-declaration]
i2c_del_adapter(&priv->adap);
Signed-off-by: Ralf Baechle <ralf-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>
Cc: Markos Chandras <markos.chandras-1AXoQHu6uovQT0dZR+AlfA@public.gmane.org>
Cc: Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org
Cc: Chris Dearman <chris.dearman-1AXoQHu6uovQT0dZR+AlfA@public.gmane.org>
diff --git a/arch/mips/mti-sead3/sead3-i2c-drv.c b/arch/mips/mti-sead3/sead3-i2c-drv.c
deleted file mode 100644
index 1f787a6..0000000
--- a/arch/mips/mti-sead3/sead3-i2c-drv.c
+++ /dev/null
@@ -1,405 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
- */
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/i2c.h>
-#include <linux/platform_device.h>
-
-#define PIC32_I2CxCON 0x0000
-#define PIC32_I2CCON_ON (1<<15)
-#define PIC32_I2CCON_ACKDT (1<<5)
-#define PIC32_I2CCON_ACKEN (1<<4)
-#define PIC32_I2CCON_RCEN (1<<3)
-#define PIC32_I2CCON_PEN (1<<2)
-#define PIC32_I2CCON_RSEN (1<<1)
-#define PIC32_I2CCON_SEN (1<<0)
-#define PIC32_I2CxCONCLR 0x0004
-#define PIC32_I2CxCONSET 0x0008
-#define PIC32_I2CxSTAT 0x0010
-#define PIC32_I2CxSTATCLR 0x0014
-#define PIC32_I2CSTAT_ACKSTAT (1<<15)
-#define PIC32_I2CSTAT_TRSTAT (1<<14)
-#define PIC32_I2CSTAT_BCL (1<<10)
-#define PIC32_I2CSTAT_IWCOL (1<<7)
-#define PIC32_I2CSTAT_I2COV (1<<6)
-#define PIC32_I2CxBRG 0x0040
-#define PIC32_I2CxTRN 0x0050
-#define PIC32_I2CxRCV 0x0060
-
-static DEFINE_SPINLOCK(pic32_bus_lock);
-
-static void __iomem *bus_xfer = (void __iomem *)0xbf000600;
-static void __iomem *bus_status = (void __iomem *)0xbf000060;
-
-#define DELAY() udelay(100)
-
-static inline unsigned int ioready(void)
-{
- return readl(bus_status) & 1;
-}
-
-static inline void wait_ioready(void)
-{
- do { } while (!ioready());
-}
-
-static inline void wait_ioclear(void)
-{
- do { } while (ioready());
-}
-
-static inline void check_ioclear(void)
-{
- if (ioready()) {
- do {
- (void) readl(bus_xfer);
- DELAY();
- } while (ioready());
- }
-}
-
-static u32 pic32_bus_readl(u32 reg)
-{
- unsigned long flags;
- u32 status, val;
-
- spin_lock_irqsave(&pic32_bus_lock, flags);
-
- check_ioclear();
- writel((0x01 << 24) | (reg & 0x00ffffff), bus_xfer);
- DELAY();
- wait_ioready();
- status = readl(bus_xfer);
- DELAY();
- val = readl(bus_xfer);
- wait_ioclear();
-
- spin_unlock_irqrestore(&pic32_bus_lock, flags);
-
- return val;
-}
-
-static void pic32_bus_writel(u32 val, u32 reg)
-{
- unsigned long flags;
- u32 status;
-
- spin_lock_irqsave(&pic32_bus_lock, flags);
-
- check_ioclear();
- writel((0x10 << 24) | (reg & 0x00ffffff), bus_xfer);
- DELAY();
- writel(val, bus_xfer);
- DELAY();
- wait_ioready();
- status = readl(bus_xfer);
- wait_ioclear();
-
- spin_unlock_irqrestore(&pic32_bus_lock, flags);
-}
-
-struct pic32_i2c_platform_data {
- u32 base;
- struct i2c_adapter adap;
- u32 xfer_timeout;
- u32 ack_timeout;
- u32 ctl_timeout;
-};
-
-static inline void pic32_i2c_start(struct pic32_i2c_platform_data *adap)
-{
- pic32_bus_writel(PIC32_I2CCON_SEN, adap->base + PIC32_I2CxCONSET);
-}
-
-static inline void pic32_i2c_stop(struct pic32_i2c_platform_data *adap)
-{
- pic32_bus_writel(PIC32_I2CCON_PEN, adap->base + PIC32_I2CxCONSET);
-}
-
-static inline void pic32_i2c_ack(struct pic32_i2c_platform_data *adap)
-{
- pic32_bus_writel(PIC32_I2CCON_ACKDT, adap->base + PIC32_I2CxCONCLR);
- pic32_bus_writel(PIC32_I2CCON_ACKEN, adap->base + PIC32_I2CxCONSET);
-}
-
-static inline void pic32_i2c_nack(struct pic32_i2c_platform_data *adap)
-{
- pic32_bus_writel(PIC32_I2CCON_ACKDT, adap->base + PIC32_I2CxCONSET);
- pic32_bus_writel(PIC32_I2CCON_ACKEN, adap->base + PIC32_I2CxCONSET);
-}
-
-static inline int pic32_i2c_idle(struct pic32_i2c_platform_data *adap)
-{
- int i;
-
- for (i = 0; i < adap->ctl_timeout; i++) {
- if (((pic32_bus_readl(adap->base + PIC32_I2CxCON) &
- (PIC32_I2CCON_ACKEN | PIC32_I2CCON_RCEN |
- PIC32_I2CCON_PEN | PIC32_I2CCON_RSEN |
- PIC32_I2CCON_SEN)) == 0) &&
- ((pic32_bus_readl(adap->base + PIC32_I2CxSTAT) &
- (PIC32_I2CSTAT_TRSTAT)) == 0))
- return 0;
- udelay(1);
- }
- return -ETIMEDOUT;
-}
-
-static inline u32 pic32_i2c_master_write(struct pic32_i2c_platform_data *adap,
- u32 byte)
-{
- pic32_bus_writel(byte, adap->base + PIC32_I2CxTRN);
- return pic32_bus_readl(adap->base + PIC32_I2CxSTAT) &
- PIC32_I2CSTAT_IWCOL;
-}
-
-static inline u32 pic32_i2c_master_read(struct pic32_i2c_platform_data *adap)
-{
- pic32_bus_writel(PIC32_I2CCON_RCEN, adap->base + PIC32_I2CxCONSET);
- while (pic32_bus_readl(adap->base + PIC32_I2CxCON) & PIC32_I2CCON_RCEN)
- ;
- pic32_bus_writel(PIC32_I2CSTAT_I2COV, adap->base + PIC32_I2CxSTATCLR);
- return pic32_bus_readl(adap->base + PIC32_I2CxRCV);
-}
-
-static int pic32_i2c_address(struct pic32_i2c_platform_data *adap,
- unsigned int addr, int rd)
-{
- pic32_i2c_idle(adap);
- pic32_i2c_start(adap);
- pic32_i2c_idle(adap);
-
- addr <<= 1;
- if (rd)
- addr |= 1;
-
- if (pic32_i2c_master_write(adap, addr))
- return -EIO;
- pic32_i2c_idle(adap);
- if (pic32_bus_readl(adap->base + PIC32_I2CxSTAT) &
- PIC32_I2CSTAT_ACKSTAT)
- return -EIO;
- return 0;
-}
-
-static int sead3_i2c_read(struct pic32_i2c_platform_data *adap,
- unsigned char *buf, unsigned int len)
-{
- u32 data;
- int i;
-
- i = 0;
- while (i < len) {
- data = pic32_i2c_master_read(adap);
- buf[i++] = data;
- if (i < len)
- pic32_i2c_ack(adap);
- else
- pic32_i2c_nack(adap);
- }
-
- pic32_i2c_stop(adap);
- pic32_i2c_idle(adap);
- return 0;
-}
-
-static int sead3_i2c_write(struct pic32_i2c_platform_data *adap,
- unsigned char *buf, unsigned int len)
-{
- int i;
- u32 data;
-
- i = 0;
- while (i < len) {
- data = buf[i];
- if (pic32_i2c_master_write(adap, data))
- return -EIO;
- pic32_i2c_idle(adap);
- if (pic32_bus_readl(adap->base + PIC32_I2CxSTAT) &
- PIC32_I2CSTAT_ACKSTAT)
- return -EIO;
- i++;
- }
-
- pic32_i2c_stop(adap);
- pic32_i2c_idle(adap);
- return 0;
-}
-
-static int sead3_pic32_platform_xfer(struct i2c_adapter *i2c_adap,
- struct i2c_msg *msgs, int num)
-{
- struct pic32_i2c_platform_data *adap = i2c_adap->algo_data;
- struct i2c_msg *p;
- int i, err = 0;
-
- for (i = 0; i < num; i++) {
-#define __BUFSIZE 80
- int ii;
- static char buf[__BUFSIZE];
- char *b = buf;
-
- p = &msgs[i];
- b += sprintf(buf, " [%d bytes]", p->len);
- if ((p->flags & I2C_M_RD) == 0) {
- for (ii = 0; ii < p->len; ii++) {
- if (b < &buf[__BUFSIZE-4]) {
- b += sprintf(b, " %02x", p->buf[ii]);
- } else {
- strcat(b, "...");
- break;
- }
- }
- }
- }
-
- for (i = 0; !err && i < num; i++) {
- p = &msgs[i];
- err = pic32_i2c_address(adap, p->addr, p->flags & I2C_M_RD);
- if (err || !p->len)
- continue;
- if (p->flags & I2C_M_RD)
- err = sead3_i2c_read(adap, p->buf, p->len);
- else
- err = sead3_i2c_write(adap, p->buf, p->len);
- }
-
- /* Return the number of messages processed, or the error code. */
- if (err == 0)
- err = num;
-
- return err;
-}
-
-static u32 sead3_pic32_platform_func(struct i2c_adapter *adap)
-{
- return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
-}
-
-static const struct i2c_algorithm sead3_platform_algo = {
- .master_xfer = sead3_pic32_platform_xfer,
- .functionality = sead3_pic32_platform_func,
-};
-
-static void sead3_i2c_platform_setup(struct pic32_i2c_platform_data *priv)
-{
- pic32_bus_writel(500, priv->base + PIC32_I2CxBRG);
- pic32_bus_writel(PIC32_I2CCON_ON, priv->base + PIC32_I2CxCONCLR);
- pic32_bus_writel(PIC32_I2CCON_ON, priv->base + PIC32_I2CxCONSET);
- pic32_bus_writel(PIC32_I2CSTAT_BCL | PIC32_I2CSTAT_IWCOL,
- priv->base + PIC32_I2CxSTATCLR);
-}
-
-static int sead3_i2c_platform_probe(struct platform_device *pdev)
-{
- struct pic32_i2c_platform_data *priv;
- struct resource *r;
- int ret;
-
- r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!r) {
- ret = -ENODEV;
- goto out;
- }
-
- priv = kzalloc(sizeof(struct pic32_i2c_platform_data), GFP_KERNEL);
- if (!priv) {
- ret = -ENOMEM;
- goto out;
- }
-
- priv->base = r->start;
- if (!priv->base) {
- ret = -EBUSY;
- goto out_mem;
- }
-
- priv->xfer_timeout = 200;
- priv->ack_timeout = 200;
- priv->ctl_timeout = 200;
-
- priv->adap.nr = pdev->id;
- priv->adap.algo = &sead3_platform_algo;
- priv->adap.algo_data = priv;
- priv->adap.dev.parent = &pdev->dev;
- strlcpy(priv->adap.name, "SEAD3 PIC32", sizeof(priv->adap.name));
-
- sead3_i2c_platform_setup(priv);
-
- ret = i2c_add_numbered_adapter(&priv->adap);
- if (ret == 0) {
- platform_set_drvdata(pdev, priv);
- return 0;
- }
-
-out_mem:
- kfree(priv);
-out:
- return ret;
-}
-
-static int sead3_i2c_platform_remove(struct platform_device *pdev)
-{
- struct pic32_i2c_platform_data *priv = platform_get_drvdata(pdev);
-
- platform_set_drvdata(pdev, NULL);
- i2c_del_adapter(&priv->adap);
- kfree(priv);
- return 0;
-}
-
-#ifdef CONFIG_PM
-static int sead3_i2c_platform_suspend(struct platform_device *pdev,
- pm_message_t state)
-{
- dev_dbg(&pdev->dev, "i2c_platform_disable\n");
- return 0;
-}
-
-static int sead3_i2c_platform_resume(struct platform_device *pdev)
-{
- struct pic32_i2c_platform_data *priv = platform_get_drvdata(pdev);
-
- dev_dbg(&pdev->dev, "sead3_i2c_platform_setup\n");
- sead3_i2c_platform_setup(priv);
-
- return 0;
-}
-#else
-#define sead3_i2c_platform_suspend NULL
-#define sead3_i2c_platform_resume NULL
-#endif
-
-static struct platform_driver sead3_i2c_platform_driver = {
- .driver = {
- .name = "sead3-i2c",
- .owner = THIS_MODULE,
- },
- .probe = sead3_i2c_platform_probe,
- .remove = sead3_i2c_platform_remove,
- .suspend = sead3_i2c_platform_suspend,
- .resume = sead3_i2c_platform_resume,
-};
-
-static int __init sead3_i2c_platform_init(void)
-{
- return platform_driver_register(&sead3_i2c_platform_driver);
-}
-module_init(sead3_i2c_platform_init);
-
-static void __exit sead3_i2c_platform_exit(void)
-{
- platform_driver_unregister(&sead3_i2c_platform_driver);
-}
-module_exit(sead3_i2c_platform_exit);
-
-MODULE_AUTHOR("Chris Dearman, MIPS Technologies INC.");
-MODULE_DESCRIPTION("SEAD3 PIC32 I2C driver");
-MODULE_LICENSE("GPL");
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 917c358..1e849d7 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -724,6 +724,13 @@ config I2C_S3C2410
Say Y here to include support for I2C controller in the
Samsung SoCs.
+config I2C_SEAD3
+ tristate "SEAD3 I2C Driver"
+ depends on MIPS_SEAD3
+ help
+ Say Y here to include support for I2C controller on the
+ MIPS SEAD3 evaluation board.
+
config I2C_SH7760
tristate "Renesas SH7760 I2C Controller"
depends on CPU_SUBTYPE_SH7760
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 78d56c5..ec255db 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_I2C_QUP) += i2c-qup.o
obj-$(CONFIG_I2C_RIIC) += i2c-riic.o
obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o
obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o
+obj-$(CONFIG_I2C_SEAD3) += i2c-sead3.o
obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o
obj-$(CONFIG_I2C_SH_MOBILE) += i2c-sh_mobile.o
obj-$(CONFIG_I2C_SIMTEC) += i2c-simtec.o
diff --git a/drivers/i2c/busses/i2c-sead3.c b/drivers/i2c/busses/i2c-sead3.c
new file mode 100644
index 0000000..1f787a6
--- /dev/null
+++ b/drivers/i2c/busses/i2c-sead3.c
@@ -0,0 +1,405 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+
+#define PIC32_I2CxCON 0x0000
+#define PIC32_I2CCON_ON (1<<15)
+#define PIC32_I2CCON_ACKDT (1<<5)
+#define PIC32_I2CCON_ACKEN (1<<4)
+#define PIC32_I2CCON_RCEN (1<<3)
+#define PIC32_I2CCON_PEN (1<<2)
+#define PIC32_I2CCON_RSEN (1<<1)
+#define PIC32_I2CCON_SEN (1<<0)
+#define PIC32_I2CxCONCLR 0x0004
+#define PIC32_I2CxCONSET 0x0008
+#define PIC32_I2CxSTAT 0x0010
+#define PIC32_I2CxSTATCLR 0x0014
+#define PIC32_I2CSTAT_ACKSTAT (1<<15)
+#define PIC32_I2CSTAT_TRSTAT (1<<14)
+#define PIC32_I2CSTAT_BCL (1<<10)
+#define PIC32_I2CSTAT_IWCOL (1<<7)
+#define PIC32_I2CSTAT_I2COV (1<<6)
+#define PIC32_I2CxBRG 0x0040
+#define PIC32_I2CxTRN 0x0050
+#define PIC32_I2CxRCV 0x0060
+
+static DEFINE_SPINLOCK(pic32_bus_lock);
+
+static void __iomem *bus_xfer = (void __iomem *)0xbf000600;
+static void __iomem *bus_status = (void __iomem *)0xbf000060;
+
+#define DELAY() udelay(100)
+
+static inline unsigned int ioready(void)
+{
+ return readl(bus_status) & 1;
+}
+
+static inline void wait_ioready(void)
+{
+ do { } while (!ioready());
+}
+
+static inline void wait_ioclear(void)
+{
+ do { } while (ioready());
+}
+
+static inline void check_ioclear(void)
+{
+ if (ioready()) {
+ do {
+ (void) readl(bus_xfer);
+ DELAY();
+ } while (ioready());
+ }
+}
+
+static u32 pic32_bus_readl(u32 reg)
+{
+ unsigned long flags;
+ u32 status, val;
+
+ spin_lock_irqsave(&pic32_bus_lock, flags);
+
+ check_ioclear();
+ writel((0x01 << 24) | (reg & 0x00ffffff), bus_xfer);
+ DELAY();
+ wait_ioready();
+ status = readl(bus_xfer);
+ DELAY();
+ val = readl(bus_xfer);
+ wait_ioclear();
+
+ spin_unlock_irqrestore(&pic32_bus_lock, flags);
+
+ return val;
+}
+
+static void pic32_bus_writel(u32 val, u32 reg)
+{
+ unsigned long flags;
+ u32 status;
+
+ spin_lock_irqsave(&pic32_bus_lock, flags);
+
+ check_ioclear();
+ writel((0x10 << 24) | (reg & 0x00ffffff), bus_xfer);
+ DELAY();
+ writel(val, bus_xfer);
+ DELAY();
+ wait_ioready();
+ status = readl(bus_xfer);
+ wait_ioclear();
+
+ spin_unlock_irqrestore(&pic32_bus_lock, flags);
+}
+
+struct pic32_i2c_platform_data {
+ u32 base;
+ struct i2c_adapter adap;
+ u32 xfer_timeout;
+ u32 ack_timeout;
+ u32 ctl_timeout;
+};
+
+static inline void pic32_i2c_start(struct pic32_i2c_platform_data *adap)
+{
+ pic32_bus_writel(PIC32_I2CCON_SEN, adap->base + PIC32_I2CxCONSET);
+}
+
+static inline void pic32_i2c_stop(struct pic32_i2c_platform_data *adap)
+{
+ pic32_bus_writel(PIC32_I2CCON_PEN, adap->base + PIC32_I2CxCONSET);
+}
+
+static inline void pic32_i2c_ack(struct pic32_i2c_platform_data *adap)
+{
+ pic32_bus_writel(PIC32_I2CCON_ACKDT, adap->base + PIC32_I2CxCONCLR);
+ pic32_bus_writel(PIC32_I2CCON_ACKEN, adap->base + PIC32_I2CxCONSET);
+}
+
+static inline void pic32_i2c_nack(struct pic32_i2c_platform_data *adap)
+{
+ pic32_bus_writel(PIC32_I2CCON_ACKDT, adap->base + PIC32_I2CxCONSET);
+ pic32_bus_writel(PIC32_I2CCON_ACKEN, adap->base + PIC32_I2CxCONSET);
+}
+
+static inline int pic32_i2c_idle(struct pic32_i2c_platform_data *adap)
+{
+ int i;
+
+ for (i = 0; i < adap->ctl_timeout; i++) {
+ if (((pic32_bus_readl(adap->base + PIC32_I2CxCON) &
+ (PIC32_I2CCON_ACKEN | PIC32_I2CCON_RCEN |
+ PIC32_I2CCON_PEN | PIC32_I2CCON_RSEN |
+ PIC32_I2CCON_SEN)) == 0) &&
+ ((pic32_bus_readl(adap->base + PIC32_I2CxSTAT) &
+ (PIC32_I2CSTAT_TRSTAT)) == 0))
+ return 0;
+ udelay(1);
+ }
+ return -ETIMEDOUT;
+}
+
+static inline u32 pic32_i2c_master_write(struct pic32_i2c_platform_data *adap,
+ u32 byte)
+{
+ pic32_bus_writel(byte, adap->base + PIC32_I2CxTRN);
+ return pic32_bus_readl(adap->base + PIC32_I2CxSTAT) &
+ PIC32_I2CSTAT_IWCOL;
+}
+
+static inline u32 pic32_i2c_master_read(struct pic32_i2c_platform_data *adap)
+{
+ pic32_bus_writel(PIC32_I2CCON_RCEN, adap->base + PIC32_I2CxCONSET);
+ while (pic32_bus_readl(adap->base + PIC32_I2CxCON) & PIC32_I2CCON_RCEN)
+ ;
+ pic32_bus_writel(PIC32_I2CSTAT_I2COV, adap->base + PIC32_I2CxSTATCLR);
+ return pic32_bus_readl(adap->base + PIC32_I2CxRCV);
+}
+
+static int pic32_i2c_address(struct pic32_i2c_platform_data *adap,
+ unsigned int addr, int rd)
+{
+ pic32_i2c_idle(adap);
+ pic32_i2c_start(adap);
+ pic32_i2c_idle(adap);
+
+ addr <<= 1;
+ if (rd)
+ addr |= 1;
+
+ if (pic32_i2c_master_write(adap, addr))
+ return -EIO;
+ pic32_i2c_idle(adap);
+ if (pic32_bus_readl(adap->base + PIC32_I2CxSTAT) &
+ PIC32_I2CSTAT_ACKSTAT)
+ return -EIO;
+ return 0;
+}
+
+static int sead3_i2c_read(struct pic32_i2c_platform_data *adap,
+ unsigned char *buf, unsigned int len)
+{
+ u32 data;
+ int i;
+
+ i = 0;
+ while (i < len) {
+ data = pic32_i2c_master_read(adap);
+ buf[i++] = data;
+ if (i < len)
+ pic32_i2c_ack(adap);
+ else
+ pic32_i2c_nack(adap);
+ }
+
+ pic32_i2c_stop(adap);
+ pic32_i2c_idle(adap);
+ return 0;
+}
+
+static int sead3_i2c_write(struct pic32_i2c_platform_data *adap,
+ unsigned char *buf, unsigned int len)
+{
+ int i;
+ u32 data;
+
+ i = 0;
+ while (i < len) {
+ data = buf[i];
+ if (pic32_i2c_master_write(adap, data))
+ return -EIO;
+ pic32_i2c_idle(adap);
+ if (pic32_bus_readl(adap->base + PIC32_I2CxSTAT) &
+ PIC32_I2CSTAT_ACKSTAT)
+ return -EIO;
+ i++;
+ }
+
+ pic32_i2c_stop(adap);
+ pic32_i2c_idle(adap);
+ return 0;
+}
+
+static int sead3_pic32_platform_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msgs, int num)
+{
+ struct pic32_i2c_platform_data *adap = i2c_adap->algo_data;
+ struct i2c_msg *p;
+ int i, err = 0;
+
+ for (i = 0; i < num; i++) {
+#define __BUFSIZE 80
+ int ii;
+ static char buf[__BUFSIZE];
+ char *b = buf;
+
+ p = &msgs[i];
+ b += sprintf(buf, " [%d bytes]", p->len);
+ if ((p->flags & I2C_M_RD) == 0) {
+ for (ii = 0; ii < p->len; ii++) {
+ if (b < &buf[__BUFSIZE-4]) {
+ b += sprintf(b, " %02x", p->buf[ii]);
+ } else {
+ strcat(b, "...");
+ break;
+ }
+ }
+ }
+ }
+
+ for (i = 0; !err && i < num; i++) {
+ p = &msgs[i];
+ err = pic32_i2c_address(adap, p->addr, p->flags & I2C_M_RD);
+ if (err || !p->len)
+ continue;
+ if (p->flags & I2C_M_RD)
+ err = sead3_i2c_read(adap, p->buf, p->len);
+ else
+ err = sead3_i2c_write(adap, p->buf, p->len);
+ }
+
+ /* Return the number of messages processed, or the error code. */
+ if (err == 0)
+ err = num;
+
+ return err;
+}
+
+static u32 sead3_pic32_platform_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm sead3_platform_algo = {
+ .master_xfer = sead3_pic32_platform_xfer,
+ .functionality = sead3_pic32_platform_func,
+};
+
+static void sead3_i2c_platform_setup(struct pic32_i2c_platform_data *priv)
+{
+ pic32_bus_writel(500, priv->base + PIC32_I2CxBRG);
+ pic32_bus_writel(PIC32_I2CCON_ON, priv->base + PIC32_I2CxCONCLR);
+ pic32_bus_writel(PIC32_I2CCON_ON, priv->base + PIC32_I2CxCONSET);
+ pic32_bus_writel(PIC32_I2CSTAT_BCL | PIC32_I2CSTAT_IWCOL,
+ priv->base + PIC32_I2CxSTATCLR);
+}
+
+static int sead3_i2c_platform_probe(struct platform_device *pdev)
+{
+ struct pic32_i2c_platform_data *priv;
+ struct resource *r;
+ int ret;
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ priv = kzalloc(sizeof(struct pic32_i2c_platform_data), GFP_KERNEL);
+ if (!priv) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ priv->base = r->start;
+ if (!priv->base) {
+ ret = -EBUSY;
+ goto out_mem;
+ }
+
+ priv->xfer_timeout = 200;
+ priv->ack_timeout = 200;
+ priv->ctl_timeout = 200;
+
+ priv->adap.nr = pdev->id;
+ priv->adap.algo = &sead3_platform_algo;
+ priv->adap.algo_data = priv;
+ priv->adap.dev.parent = &pdev->dev;
+ strlcpy(priv->adap.name, "SEAD3 PIC32", sizeof(priv->adap.name));
+
+ sead3_i2c_platform_setup(priv);
+
+ ret = i2c_add_numbered_adapter(&priv->adap);
+ if (ret == 0) {
+ platform_set_drvdata(pdev, priv);
+ return 0;
+ }
+
+out_mem:
+ kfree(priv);
+out:
+ return ret;
+}
+
+static int sead3_i2c_platform_remove(struct platform_device *pdev)
+{
+ struct pic32_i2c_platform_data *priv = platform_get_drvdata(pdev);
+
+ platform_set_drvdata(pdev, NULL);
+ i2c_del_adapter(&priv->adap);
+ kfree(priv);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int sead3_i2c_platform_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ dev_dbg(&pdev->dev, "i2c_platform_disable\n");
+ return 0;
+}
+
+static int sead3_i2c_platform_resume(struct platform_device *pdev)
+{
+ struct pic32_i2c_platform_data *priv = platform_get_drvdata(pdev);
+
+ dev_dbg(&pdev->dev, "sead3_i2c_platform_setup\n");
+ sead3_i2c_platform_setup(priv);
+
+ return 0;
+}
+#else
+#define sead3_i2c_platform_suspend NULL
+#define sead3_i2c_platform_resume NULL
+#endif
+
+static struct platform_driver sead3_i2c_platform_driver = {
+ .driver = {
+ .name = "sead3-i2c",
+ .owner = THIS_MODULE,
+ },
+ .probe = sead3_i2c_platform_probe,
+ .remove = sead3_i2c_platform_remove,
+ .suspend = sead3_i2c_platform_suspend,
+ .resume = sead3_i2c_platform_resume,
+};
+
+static int __init sead3_i2c_platform_init(void)
+{
+ return platform_driver_register(&sead3_i2c_platform_driver);
+}
+module_init(sead3_i2c_platform_init);
+
+static void __exit sead3_i2c_platform_exit(void)
+{
+ platform_driver_unregister(&sead3_i2c_platform_driver);
+}
+module_exit(sead3_i2c_platform_exit);
+
+MODULE_AUTHOR("Chris Dearman, MIPS Technologies INC.");
+MODULE_DESCRIPTION("SEAD3 PIC32 I2C driver");
+MODULE_LICENSE("GPL");
^ permalink raw reply related [flat|nested] 2+ messages in thread