diff options
Diffstat (limited to 'arch/mips/mti-sead3/sead3-i2c-drv.c')
| -rw-r--r-- | arch/mips/mti-sead3/sead3-i2c-drv.c | 404 |
1 files changed, 0 insertions, 404 deletions
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 2bebf0974e39..000000000000 --- a/arch/mips/mti-sead3/sead3-i2c-drv.c +++ /dev/null @@ -1,404 +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", - }, - .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"); |