diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/i2c/busses/Makefile | 1 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-bfin-twi.c | 24 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-eg20t.c | 900 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-iop3xx.c | 6 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-iop3xx.h | 2 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-mv64xxx.c | 45 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-nomadik.c | 6 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-ocores.c | 145 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-omap.c | 10 |
10 files changed, 1086 insertions, 61 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 3a6321cb8030..113505a6434e 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -638,6 +638,14 @@ config I2C_XILINX This driver can also be built as a module. If so, the module will be called xilinx_i2c. +config I2C_EG20T + tristate "PCH I2C of Intel EG20T" + depends on PCI + help + This driver is for PCH(Platform controller Hub) I2C of EG20T which + is an IOH(Input/Output Hub) for x86 embedded processor. + This driver can access PCH I2C bus device. + comment "External I2C/SMBus adapter drivers" config I2C_PARPORT diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 84cb16ae6f9e..9d2d0ec7fb23 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -61,6 +61,7 @@ obj-$(CONFIG_I2C_STU300) += i2c-stu300.o obj-$(CONFIG_I2C_VERSATILE) += i2c-versatile.o obj-$(CONFIG_I2C_OCTEON) += i2c-octeon.o obj-$(CONFIG_I2C_XILINX) += i2c-xiic.o +obj-$(CONFIG_I2C_EG20T) += i2c-eg20t.o # External I2C/SMBus adapter drivers obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o diff --git a/drivers/i2c/busses/i2c-bfin-twi.c b/drivers/i2c/busses/i2c-bfin-twi.c index fb26e5c67515..52b545a795f2 100644 --- a/drivers/i2c/busses/i2c-bfin-twi.c +++ b/drivers/i2c/busses/i2c-bfin-twi.c @@ -20,6 +20,7 @@ #include <linux/completion.h> #include <linux/interrupt.h> #include <linux/platform_device.h> +#include <linux/delay.h> #include <asm/blackfin.h> #include <asm/portmux.h> @@ -159,6 +160,27 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface, if (mast_stat & BUFWRERR) dev_dbg(&iface->adap.dev, "Buffer Write Error\n"); + /* Faulty slave devices, may drive SDA low after a transfer + * finishes. To release the bus this code generates up to 9 + * extra clocks until SDA is released. + */ + + if (read_MASTER_STAT(iface) & SDASEN) { + int cnt = 9; + do { + write_MASTER_CTL(iface, SCLOVR); + udelay(6); + write_MASTER_CTL(iface, 0); + udelay(6); + } while ((read_MASTER_STAT(iface) & SDASEN) && cnt--); + + write_MASTER_CTL(iface, SDAOVR | SCLOVR); + udelay(6); + write_MASTER_CTL(iface, SDAOVR); + udelay(6); + write_MASTER_CTL(iface, 0); + } + /* If it is a quick transfer, only address without data, * not an err, return 1. */ @@ -760,7 +782,7 @@ static void __exit i2c_bfin_twi_exit(void) platform_driver_unregister(&i2c_bfin_twi_driver); } -module_init(i2c_bfin_twi_init); +subsys_initcall(i2c_bfin_twi_init); module_exit(i2c_bfin_twi_exit); MODULE_AUTHOR("Bryan Wu, Sonic Zhang"); diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c new file mode 100644 index 000000000000..2e067dd2ee51 --- /dev/null +++ b/drivers/i2c/busses/i2c-eg20t.c @@ -0,0 +1,900 @@ +/* + * Copyright (C) 2010 OKI SEMICONDUCTOR CO., LTD. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/i2c.h> +#include <linux/fs.h> +#include <linux/io.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/jiffies.h> +#include <linux/pci.h> +#include <linux/mutex.h> +#include <linux/ktime.h> + +#define PCH_EVENT_SET 0 /* I2C Interrupt Event Set Status */ +#define PCH_EVENT_NONE 1 /* I2C Interrupt Event Clear Status */ +#define PCH_MAX_CLK 100000 /* Maximum Clock speed in MHz */ +#define PCH_BUFFER_MODE_ENABLE 0x0002 /* flag for Buffer mode enable */ +#define PCH_EEPROM_SW_RST_MODE_ENABLE 0x0008 /* EEPROM SW RST enable flag */ + +#define PCH_I2CSADR 0x00 /* I2C slave address register */ +#define PCH_I2CCTL 0x04 /* I2C control register */ +#define PCH_I2CSR 0x08 /* I2C status register */ +#define PCH_I2CDR 0x0C /* I2C data register */ +#define PCH_I2CMON 0x10 /* I2C bus monitor register */ +#define PCH_I2CBC 0x14 /* I2C bus transfer rate setup counter */ +#define PCH_I2CMOD 0x18 /* I2C mode register */ +#define PCH_I2CBUFSLV 0x1C /* I2C buffer mode slave address register */ +#define PCH_I2CBUFSUB 0x20 /* I2C buffer mode subaddress register */ +#define PCH_I2CBUFFOR 0x24 /* I2C buffer mode format register */ +#define PCH_I2CBUFCTL 0x28 /* I2C buffer mode control register */ +#define PCH_I2CBUFMSK 0x2C /* I2C buffer mode interrupt mask register */ +#define PCH_I2CBUFSTA 0x30 /* I2C buffer mode status register */ +#define PCH_I2CBUFLEV 0x34 /* I2C buffer mode level register */ +#define PCH_I2CESRFOR 0x38 /* EEPROM software reset mode format register */ +#define PCH_I2CESRCTL 0x3C /* EEPROM software reset mode ctrl register */ +#define PCH_I2CESRMSK 0x40 /* EEPROM software reset mode */ +#define PCH_I2CESRSTA 0x44 /* EEPROM software reset mode status register */ +#define PCH_I2CTMR 0x48 /* I2C timer register */ +#define PCH_I2CSRST 0xFC /* I2C reset register */ +#define PCH_I2CNF 0xF8 /* I2C noise filter register */ + +#define BUS_IDLE_TIMEOUT 20 +#define PCH_I2CCTL_I2CMEN 0x0080 +#define TEN_BIT_ADDR_DEFAULT 0xF000 +#define TEN_BIT_ADDR_MASK 0xF0 +#define PCH_START 0x0020 +#define PCH_ESR_START 0x0001 +#define PCH_BUFF_START 0x1 +#define PCH_REPSTART 0x0004 +#define PCH_ACK 0x0008 +#define PCH_GETACK 0x0001 +#define CLR_REG 0x0 +#define I2C_RD 0x1 +#define I2CMCF_BIT 0x0080 +#define I2CMIF_BIT 0x0002 +#define I2CMAL_BIT 0x0010 +#define I2CBMFI_BIT 0x0001 +#define I2CBMAL_BIT 0x0002 +#define I2CBMNA_BIT 0x0004 +#define I2CBMTO_BIT 0x0008 +#define I2CBMIS_BIT 0x0010 +#define I2CESRFI_BIT 0X0001 +#define I2CESRTO_BIT 0x0002 +#define I2CESRFIIE_BIT 0x1 +#define I2CESRTOIE_BIT 0x2 +#define I2CBMDZ_BIT 0x0040 +#define I2CBMAG_BIT 0x0020 +#define I2CMBB_BIT 0x0020 +#define BUFFER_MODE_MASK (I2CBMFI_BIT | I2CBMAL_BIT | I2CBMNA_BIT | \ + I2CBMTO_BIT | I2CBMIS_BIT) +#define I2C_ADDR_MSK 0xFF +#define I2C_MSB_2B_MSK 0x300 +#define FAST_MODE_CLK 400 +#define FAST_MODE_EN 0x0001 +#define SUB_ADDR_LEN_MAX 4 +#define BUF_LEN_MAX 32 +#define PCH_BUFFER_MODE 0x1 +#define EEPROM_SW_RST_MODE 0x0002 +#define NORMAL_INTR_ENBL 0x0300 +#define EEPROM_RST_INTR_ENBL (I2CESRFIIE_BIT | I2CESRTOIE_BIT) +#define EEPROM_RST_INTR_DISBL 0x0 +#define BUFFER_MODE_INTR_ENBL 0x001F +#define BUFFER_MODE_INTR_DISBL 0x0 +#define NORMAL_MODE 0x0 +#define BUFFER_MODE 0x1 +#define EEPROM_SR_MODE 0x2 +#define I2C_TX_MODE 0x0010 +#define PCH_BUF_TX 0xFFF7 +#define PCH_BUF_RD 0x0008 +#define I2C_ERROR_MASK (I2CESRTO_EVENT | I2CBMIS_EVENT | I2CBMTO_EVENT | \ + I2CBMNA_EVENT | I2CBMAL_EVENT | I2CMAL_EVENT) +#define I2CMAL_EVENT 0x0001 +#define I2CMCF_EVENT 0x0002 +#define I2CBMFI_EVENT 0x0004 +#define I2CBMAL_EVENT 0x0008 +#define I2CBMNA_EVENT 0x0010 +#define I2CBMTO_EVENT 0x0020 +#define I2CBMIS_EVENT 0x0040 +#define I2CESRFI_EVENT 0x0080 +#define I2CESRTO_EVENT 0x0100 +#define PCI_DEVICE_ID_PCH_I2C 0x8817 + +#define pch_dbg(adap, fmt, arg...) \ + dev_dbg(adap->pch_adapter.dev.parent, "%s :" fmt, __func__, ##arg) + +#define pch_err(adap, fmt, arg...) \ + dev_err(adap->pch_adapter.dev.parent, "%s :" fmt, __func__, ##arg) + +#define pch_pci_err(pdev, fmt, arg...) \ + dev_err(&pdev->dev, "%s :" fmt, __func__, ##arg) + +#define pch_pci_dbg(pdev, fmt, arg...) \ + dev_dbg(&pdev->dev, "%s :" fmt, __func__, ##arg) + +/** + * struct i2c_algo_pch_data - for I2C driver functionalities + * @pch_adapter: stores the reference to i2c_adapter structure + * @p_adapter_info: stores the reference to adapter_info structure + * @pch_base_address: specifies the remapped base address + * @pch_buff_mode_en: specifies if buffer mode is enabled + * @pch_event_flag: specifies occurrence of interrupt events + * @pch_i2c_xfer_in_progress: specifies whether the transfer is completed + */ +struct i2c_algo_pch_data { + struct i2c_adapter pch_adapter; + struct adapter_info *p_adapter_info; + void __iomem *pch_base_address; + int pch_buff_mode_en; + u32 pch_event_flag; + bool pch_i2c_xfer_in_progress; +}; + +/** + * struct adapter_info - This structure holds the adapter information for the + PCH i2c controller + * @pch_data: stores a list of i2c_algo_pch_data + * @pch_i2c_suspended: specifies whether the system is suspended or not + * perhaps with more lines and words. + * + * pch_data has as many elements as maximum I2C channels + */ +struct adapter_info { + struct i2c_algo_pch_data pch_data; + bool pch_i2c_suspended; +}; + + +static int pch_i2c_speed = 100; /* I2C bus speed in Kbps */ +static int pch_clk = 50000; /* specifies I2C clock speed in KHz */ +static wait_queue_head_t pch_event; +static DEFINE_MUTEX(pch_mutex); + +static struct pci_device_id __devinitdata pch_pcidev_id[] = { + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PCH_I2C)}, + {0,} +}; + +static irqreturn_t pch_i2c_handler(int irq, void *pData); + +static inline void pch_setbit(void __iomem *addr, u32 offset, u32 bitmask) +{ + u32 val; + val = ioread32(addr + offset); + val |= bitmask; + iowrite32(val, addr + offset); +} + +static inline void pch_clrbit(void __iomem *addr, u32 offset, u32 bitmask) +{ + u32 val; + val = ioread32(addr + offset); + val &= (~bitmask); + iowrite32(val, addr + offset); +} + +/** + * pch_i2c_init() - hardware initialization of I2C module + * @adap: Pointer to struct i2c_algo_pch_data. + */ +static void pch_i2c_init(struct i2c_algo_pch_data *adap) +{ + void __iomem *p = adap->pch_base_address; + u32 pch_i2cbc; + u32 pch_i2ctmr; + u32 reg_value; + + /* reset I2C controller */ + iowrite32(0x01, p + PCH_I2CSRST); + msleep(20); + iowrite32(0x0, p + PCH_I2CSRST); + + /* Initialize I2C registers */ + iowrite32(0x21, p + PCH_I2CNF); + + pch_setbit(adap->pch_base_address, PCH_I2CCTL, + PCH_I2CCTL_I2CMEN); + + if (pch_i2c_speed != 400) + pch_i2c_speed = 100; + + reg_value = PCH_I2CCTL_I2CMEN; + if (pch_i2c_speed == FAST_MODE_CLK) { + reg_value |= FAST_MODE_EN; + pch_dbg(adap, "Fast mode enabled\n"); + } + + if (pch_clk > PCH_MAX_CLK) + pch_clk = 62500; + + pch_i2cbc = (pch_clk + (pch_i2c_speed * 4)) / pch_i2c_speed * 8; + /* Set transfer speed in I2CBC */ + iowrite32(pch_i2cbc, p + PCH_I2CBC); + + pch_i2ctmr = (pch_clk) / 8; + iowrite32(pch_i2ctmr, p + PCH_I2CTMR); + + reg_value |= NORMAL_INTR_ENBL; /* Enable interrupts in normal mode */ + iowrite32(reg_value, p + PCH_I2CCTL); + + pch_dbg(adap, + "I2CCTL=%x pch_i2cbc=%x pch_i2ctmr=%x Enable interrupts\n", + ioread32(p + PCH_I2CCTL), pch_i2cbc, pch_i2ctmr); + + init_waitqueue_head(&pch_event); +} + +static inline bool ktime_lt(const ktime_t cmp1, const ktime_t cmp2) +{ + return cmp1.tv64 < cmp2.tv64; +} + +/** + * pch_i2c_wait_for_bus_idle() - check the status of bus. + * @adap: Pointer to struct i2c_algo_pch_data. + * @timeout: waiting time counter (us). + */ +static s32 pch_i2c_wait_for_bus_idle(struct i2c_algo_pch_data *adap, + s32 timeout) +{ + void __iomem *p = adap->pch_base_address; + + /* MAX timeout value is timeout*1000*1000nsec */ + ktime_t ns_val = ktime_add_ns(ktime_get(), timeout*1000*1000); + do { + if ((ioread32(p + PCH_I2CSR) & I2CMBB_BIT) == 0) + break; + msleep(20); + } while (ktime_lt(ktime_get(), ns_val)); + + pch_dbg(adap, "I2CSR = %x\n", ioread32(p + PCH_I2CSR)); + + if (timeout == 0) { + pch_err(adap, "%s: Timeout Error.return%d\n", __func__, -ETIME); + return -ETIME; + } + + return 0; +} + +/** + * pch_i2c_start() - Generate I2C start condition in normal mode. + * @adap: Pointer to struct i2c_algo_pch_data. + * + * Generate I2C start condition in normal mode by setting I2CCTL.I2CMSTA to 1. + */ +static void pch_i2c_start(struct i2c_algo_pch_data *adap) +{ + void __iomem *p = adap->pch_base_address; + pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); + pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_START); +} + +/** + * pch_i2c_wait_for_xfer_complete() - initiates a wait for the tx complete event + * @adap: Pointer to struct i2c_algo_pch_data. + */ +static s32 pch_i2c_wait_for_xfer_complete(struct i2c_algo_pch_data *adap) +{ + s32 ret; + ret = wait_event_timeout(pch_event, + (adap->pch_event_flag != 0), msecs_to_jiffies(50)); + if (ret < 0) { + pch_err(adap, "timeout: %x\n", adap->pch_event_flag); + return ret; + } + + if (ret == 0) { + pch_err(adap, "timeout: %x\n", adap->pch_event_flag); + return -ETIMEDOUT; + } + + if (adap->pch_event_flag & I2C_ERROR_MASK) { + pch_err(adap, "error bits set: %x\n", adap->pch_event_flag); + return -EIO; + } + + adap->pch_event_flag = 0; + + return 0; +} + +/** + * pch_i2c_getack() - to confirm ACK/NACK + * @adap: Pointer to struct i2c_algo_pch_data. + */ +static s32 pch_i2c_getack(struct i2c_algo_pch_data *adap) +{ + u32 reg_val; + void __iomem *p = adap->pch_base_address; + reg_val = ioread32(p + PCH_I2CSR) & PCH_GETACK; + + if (reg_val != 0) { + pch_err(adap, "return%d\n", -EPROTO); + return -EPROTO; + } + + return 0; +} + +/** + * pch_i2c_stop() - generate stop condition in normal mode. + * @adap: Pointer to struct i2c_algo_pch_data. + */ +static void pch_i2c_stop(struct i2c_algo_pch_data *adap) +{ + void __iomem *p = adap->pch_base_address; + pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); + /* clear the start bit */ + pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_START); +} + +/** + * pch_i2c_repstart() - generate repeated start condition in normal mode + * @adap: Pointer to struct i2c_algo_pch_data. + */ +static void pch_i2c_repstart(struct i2c_algo_pch_data *adap) +{ + void __iomem *p = adap->pch_base_address; + pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); + pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_REPSTART); +} + +/** + * pch_i2c_writebytes() - write data to I2C bus in normal mode + * @i2c_adap: Pointer to the struct i2c_adapter. + * @last: specifies whether last message or not. + * In the case of compound mode it will be 1 for last message, + * otherwise 0. + * @first: specifies whether first message or not. + * 1 for first message otherwise 0. + */ +static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap, + struct i2c_msg *msgs, u32 last, u32 first) +{ + struct i2c_algo_pch_data *adap = i2c_adap->algo_data; + u8 *buf; + u32 length; + u32 addr; + u32 addr_2_msb; + u32 addr_8_lsb; + s32 wrcount; + void __iomem *p = adap->pch_base_address; + + length = msgs->len; + buf = msgs->buf; + addr = msgs->addr; + + /* enable master tx */ + pch_setbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE); + + pch_dbg(adap, "I2CCTL = %x msgs->len = %d\n", ioread32(p + PCH_I2CCTL), + length); + + if (first) { + if (pch_i2c_wait_for_bus_idle(adap, BUS_IDLE_TIMEOUT) == -ETIME) + return -ETIME; + } + + if (msgs->flags & I2C_M_TEN) { + addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7); + iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR); + if (first) + pch_i2c_start(adap); + if (pch_i2c_wait_for_xfer_complete(adap) == 0 && + pch_i2c_getack(adap) == 0) { + addr_8_lsb = (addr & I2C_ADDR_MSK); + iowrite32(addr_8_lsb, p + PCH_I2CDR); + } else { + pch_i2c_stop(adap); + return -ETIME; + } + } else { + /* set 7 bit slave address and R/W bit as 0 */ + iowrite32(addr << 1, p + PCH_I2CDR); + if (first) + pch_i2c_start(adap); + } + + if ((pch_i2c_wait_for_xfer_complete(adap) == 0) && + (pch_i2c_getack(adap) == 0)) { + for (wrcount = 0; wrcount < length; ++wrcount) { + /* write buffer value to I2C data register */ + iowrite32(buf[wrcount], p + PCH_I2CDR); + pch_dbg(adap, "writing %x to Data register\n", + buf[wrcount]); + + if (pch_i2c_wait_for_xfer_complete(adap) != 0) + return -ETIME; + + if (pch_i2c_getack(adap)) + return -EIO; + } + + /* check if this is the last message */ + if (last) + pch_i2c_stop(adap); + else + pch_i2c_repstart(adap); + } else { + pch_i2c_stop(adap); + return -EIO; + } + + pch_dbg(adap, "return=%d\n", wrcount); + + return wrcount; +} + +/** + * pch_i2c_sendack() - send ACK + * @adap: Pointer to struct i2c_algo_pch_data. + */ +static void pch_i2c_sendack(struct i2c_algo_pch_data *adap) +{ + void __iomem *p = adap->pch_base_address; + pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); + pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK); +} + +/** + * pch_i2c_sendnack() - send NACK + * @adap: Pointer to struct i2c_algo_pch_data. + */ +static void pch_i2c_sendnack(struct i2c_algo_pch_data *adap) +{ + void __iomem *p = adap->pch_base_address; + pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); + pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK); +} + +/** + * pch_i2c_readbytes() - read data from I2C bus in normal mode. + * @i2c_adap: Pointer to the struct i2c_adapter. + * @msgs: Pointer to i2c_msg structure. + * @last: specifies whether last message or not. + * @first: specifies whether first message or not. + */ +s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, + u32 last, u32 first) +{ + struct i2c_algo_pch_data *adap = i2c_adap->algo_data; + + u8 *buf; + u32 count; + u32 length; + u32 addr; + u32 addr_2_msb; + void __iomem *p = adap->pch_base_address; + + length = msgs->len; + buf = msgs->buf; + addr = msgs->addr; + + /* enable master reception */ + pch_clrbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE); + + if (first) { + if (pch_i2c_wait_for_bus_idle(adap, BUS_IDLE_TIMEOUT) == -ETIME) + return -ETIME; + } + + if (msgs->flags & I2C_M_TEN) { + addr_2_msb = (((addr & I2C_MSB_2B_MSK) >> 7) | (I2C_RD)); + iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR); + + } else { + /* 7 address bits + R/W bit */ + addr = (((addr) << 1) | (I2C_RD)); + iowrite32(addr, p + PCH_I2CDR); + } + + /* check if it is the first message */ + if (first) + pch_i2c_start(adap); + + if ((pch_i2c_wait_for_xfer_complete(adap) == 0) && + (pch_i2c_getack(adap) == 0)) { + pch_dbg(adap, "return %d\n", 0); + + if (length == 0) { + pch_i2c_stop(adap); + ioread32(p + PCH_I2CDR); /* Dummy read needs */ + + count = length; + } else { + int read_index; + int loop; + pch_i2c_sendack(adap); + + /* Dummy read */ + for (loop = 1, read_index = 0; loop < length; loop++) { + buf[read_index] = ioread32(p + PCH_I2CDR); + + if (loop != 1) + read_index++; + + if (pch_i2c_wait_for_xfer_complete(adap) != 0) { + pch_i2c_stop(adap); + return -ETIME; + } + } /* end for */ + + pch_i2c_sendnack(adap); + + buf[read_index] = ioread32(p + PCH_I2CDR); + + if (length != 1) + read_index++; + + if (pch_i2c_wait_for_xfer_complete(adap) == 0) { + if (last) + pch_i2c_stop(adap); + else + pch_i2c_repstart(adap); + + buf[read_index++] = ioread32(p + PCH_I2CDR); + count = read_index; + } else { + count = -ETIME; + } + + } + } else { + count = -ETIME; + pch_i2c_stop(adap); + } + + return count; +} + +/** + * pch_i2c_cb_ch0() - Interrupt handler Call back function + * @adap: Pointer to struct i2c_algo_pch_data. + */ +static void pch_i2c_cb_ch0(struct i2c_algo_pch_data *adap) +{ + u32 sts; + void __iomem *p = adap->pch_base_address; + + sts = ioread32(p + PCH_I2CSR); + sts &= (I2CMAL_BIT | I2CMCF_BIT | I2CMIF_BIT); + if (sts & I2CMAL_BIT) + adap->pch_event_flag |= I2CMAL_EVENT; + + if (sts & I2CMCF_BIT) + adap->pch_event_flag |= I2CMCF_EVENT; + + /* clear the applicable bits */ + pch_clrbit(adap->pch_base_address, PCH_I2CSR, sts); + + pch_dbg(adap, "PCH_I2CSR = %x\n", ioread32(p + PCH_I2CSR)); + + wake_up(&pch_event); +} + +/** + * pch_i2c_handler() - interrupt handler for the PCH I2C controller + * @irq: irq number. + * @pData: cookie passed back to the handler function. + */ +static irqreturn_t pch_i2c_handler(int irq, void *pData) +{ + s32 reg_val; + + struct i2c_algo_pch_data *adap_data = (struct i2c_algo_pch_data *)pData; + void __iomem *p = adap_data->pch_base_address; + u32 mode = ioread32(p + PCH_I2CMOD) & (BUFFER_MODE | EEPROM_SR_MODE); + + if (mode != NORMAL_MODE) { + pch_err(adap_data, "I2C mode is not supported\n"); + return IRQ_NONE; + } + + reg_val = ioread32(p + PCH_I2CSR); + if (reg_val & (I2CMAL_BIT | I2CMCF_BIT | I2CMIF_BIT)) + pch_i2c_cb_ch0(adap_data); + else + return IRQ_NONE; + + return IRQ_HANDLED; +} + +/** + * pch_i2c_xfer() - Reading adnd writing data through I2C bus + * @i2c_adap: Pointer to the struct i2c_adapter. + * @msgs: Pointer to i2c_msg structure. + * @num: number of messages. + */ +static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap, + struct i2c_msg *msgs, s32 num) +{ + struct i2c_msg *pmsg; + u32 i = 0; + u32 status; + u32 msglen; + u32 subaddrlen; + s32 ret; + + struct i2c_algo_pch_data *adap = i2c_adap->algo_data; + + ret = mutex_lock_interruptible(&pch_mutex); + if (ret) + return -ERESTARTSYS; + + if (adap->p_adapter_info->pch_i2c_suspended) { + mutex_unlock(&pch_mutex); + return -EBUSY; + } + + pch_dbg(adap, "adap->p_adapter_info->pch_i2c_suspended is %d\n", + adap->p_adapter_info->pch_i2c_suspended); + /* transfer not completed */ + adap->pch_i2c_xfer_in_progress = true; + + pmsg = &msgs[0]; + pmsg->flags |= adap->pch_buff_mode_en; + status = pmsg->flags; + pch_dbg(adap, + "After invoking I2C_MODE_SEL :flag= 0x%x\n", status); + /* calculate sub address length and message length */ + /* these are applicable only for buffer mode */ + subaddrlen = pmsg->buf[0]; + /* calculate actual message length excluding + * the sub address fields */ + msglen = (pmsg->len) - (subaddrlen + 1); + if (status & (I2C_M_RD)) { + pch_dbg(adap, "invoking pch_i2c_readbytes\n"); + ret = pch_i2c_readbytes(i2c_adap, pmsg, (i + 1 == num), + (i == 0)); + } else { + pch_dbg(adap, "invoking pch_i2c_writebytes\n"); + ret = pch_i2c_writebytes(i2c_adap, pmsg, (i + 1 == num), + (i == 0)); + } + + adap->pch_i2c_xfer_in_progress = false; /* transfer completed */ + + mutex_unlock(&pch_mutex); + + return ret; +} + +/** + * pch_i2c_func() - return the functionality of the I2C driver + * @adap: Pointer to struct i2c_algo_pch_data. + */ +static u32 pch_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR; +} + +static struct i2c_algorithm pch_algorithm = { + .master_xfer = pch_i2c_xfer, + .functionality = pch_i2c_func +}; + +/** + * pch_i2c_disbl_int() - Disable PCH I2C interrupts + * @adap: Pointer to struct i2c_algo_pch_data. + */ +static void pch_i2c_disbl_int(struct i2c_algo_pch_data *adap) +{ + void __iomem *p = adap->pch_base_address; + + pch_clrbit(adap->pch_base_address, PCH_I2CCTL, NORMAL_INTR_ENBL); + + iowrite32(EEPROM_RST_INTR_DISBL, p + PCH_I2CESRMSK); + + iowrite32(BUFFER_MODE_INTR_DISBL, p + PCH_I2CBUFMSK); +} + +static int __devinit pch_i2c_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + void __iomem *base_addr; + s32 ret; + struct adapter_info *adap_info; + + pch_pci_dbg(pdev, "Entered.\n"); + + adap_info = kzalloc((sizeof(struct adapter_info)), GFP_KERNEL); + if (adap_info == NULL) { + pch_pci_err(pdev, "Memory allocation FAILED\n"); + return -ENOMEM; + } + + ret = pci_enable_device(pdev); + if (ret) { + pch_pci_err(pdev, "pci_enable_device FAILED\n"); + goto err_pci_enable; + } + + ret = pci_request_regions(pdev, KBUILD_MODNAME); + if (ret) { + pch_pci_err(pdev, "pci_request_regions FAILED\n"); + goto err_pci_req; + } + + base_addr = pci_iomap(pdev, 1, 0); + + if (base_addr == NULL) { + pch_pci_err(pdev, "pci_iomap FAILED\n"); + ret = -ENOMEM; + goto err_pci_iomap; + } + + adap_info->pch_i2c_suspended = false; + + adap_info->pch_data.p_adapter_info = adap_info; + + adap_info->pch_data.pch_adapter.owner = THIS_MODULE; + adap_info->pch_data.pch_adapter.class = I2C_CLASS_HWMON; + strcpy(adap_info->pch_data.pch_adapter.name, KBUILD_MODNAME); + adap_info->pch_data.pch_adapter.algo = &pch_algorithm; + adap_info->pch_data.pch_adapter.algo_data = + &adap_info->pch_data; + + /* (i * 0x80) + base_addr; */ + adap_info->pch_data.pch_base_address = base_addr; + + adap_info->pch_data.pch_adapter.dev.parent = &pdev->dev; + + ret = i2c_add_adapter(&(adap_info->pch_data.pch_adapter)); + + if (ret) { + pch_pci_err(pdev, "i2c_add_adapter FAILED\n"); + goto err_i2c_add_adapter; + } + + pch_i2c_init(&adap_info->pch_data); + ret = request_irq(pdev->irq, pch_i2c_handler, IRQF_SHARED, + KBUILD_MODNAME, &adap_info->pch_data); + if (ret) { + pch_pci_err(pdev, "request_irq FAILED\n"); + goto err_request_irq; + } + + pci_set_drvdata(pdev, adap_info); + pch_pci_dbg(pdev, "returns %d.\n", ret); + return 0; + +err_request_irq: + i2c_del_adapter(&(adap_info->pch_data.pch_adapter)); +err_i2c_add_adapter: + pci_iounmap(pdev, base_addr); +err_pci_iomap: + pci_release_regions(pdev); +err_pci_req: + pci_disable_device(pdev); +err_pci_enable: + kfree(adap_info); + return ret; +} + +static void __devexit pch_i2c_remove(struct pci_dev *pdev) +{ + struct adapter_info *adap_info = pci_get_drvdata(pdev); + + pch_i2c_disbl_int(&adap_info->pch_data); + free_irq(pdev->irq, &adap_info->pch_data); + i2c_del_adapter(&(adap_info->pch_data.pch_adapter)); + + if (adap_info->pch_data.pch_base_address) { + pci_iounmap(pdev, adap_info->pch_data.pch_base_address); + adap_info->pch_data.pch_base_address = 0; + } + + pci_set_drvdata(pdev, NULL); + + pci_release_regions(pdev); + + pci_disable_device(pdev); + kfree(adap_info); +} + +#ifdef CONFIG_PM +static int pch_i2c_suspend(struct pci_dev *pdev, pm_message_t state) +{ + int ret; + struct adapter_info *adap_info = pci_get_drvdata(pdev); + void __iomem *p = adap_info->pch_data.pch_base_address; + + adap_info->pch_i2c_suspended = true; + + while ((adap_info->pch_data.pch_i2c_xfer_in_progress)) { + /* Wait until all channel transfers are completed */ + msleep(20); + } + /* Disable the i2c interrupts */ + pch_i2c_disbl_int(&adap_info->pch_data); + + pch_pci_dbg(pdev, "I2CSR = %x I2CBUFSTA = %x I2CESRSTA = %x " + "invoked function pch_i2c_disbl_int successfully\n", + ioread32(p + PCH_I2CSR), ioread32(p + PCH_I2CBUFSTA), + ioread32(p + PCH_I2CESRSTA)); + + ret = pci_save_state(pdev); + + if (ret) { + pch_pci_err(pdev, "pci_save_state\n"); + return ret; + } + + pci_enable_wake(pdev, PCI_D3hot, 0); + pci_disable_device(pdev); + pci_set_power_state(pdev, pci_choose_state(pdev, state)); + + return 0; +} + +static int pch_i2c_resume(struct pci_dev *pdev) +{ + struct adapter_info *adap_info = pci_get_drvdata(pdev); + + pci_set_power_state(pdev, PCI_D0); + pci_restore_state(pdev); + + if (pci_enable_device(pdev) < 0) { + pch_pci_err(pdev, "pch_i2c_resume:pci_enable_device FAILED\n"); + return -EIO; + } + + pci_enable_wake(pdev, PCI_D3hot, 0); + + pch_i2c_init(&adap_info->pch_data); + + adap_info->pch_i2c_suspended = false; + + return 0; +} +#else +#define pch_i2c_suspend NULL +#define pch_i2c_resume NULL +#endif + +static struct pci_driver pch_pcidriver = { + .name = KBUILD_MODNAME, + .id_table = pch_pcidev_id, + .probe = pch_i2c_probe, + .remove = __devexit_p(pch_i2c_remove), + .suspend = pch_i2c_suspend, + .resume = pch_i2c_resume +}; + +static int __init pch_pci_init(void) +{ + return pci_register_driver(&pch_pcidriver); +} +module_init(pch_pci_init); + +static void __exit pch_pci_exit(void) +{ + pci_unregister_driver(&pch_pcidriver); +} +module_exit(pch_pci_exit); + +MODULE_DESCRIPTION("PCH I2C PCI Driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Tomoya MORINAGA. <tomoya-linux@dsn.okisemi.com>"); +module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR)); +module_param(pch_clk, int, (S_IRUSR | S_IWUSR)); diff --git a/drivers/i2c/busses/i2c-iop3xx.c b/drivers/i2c/busses/i2c-iop3xx.c index 112c61f7b8cd..f09c9319a2ba 100644 --- a/drivers/i2c/busses/i2c-iop3xx.c +++ b/drivers/i2c/busses/i2c-iop3xx.c @@ -409,7 +409,7 @@ iop3xx_i2c_remove(struct platform_device *pdev) IOP3XX_ICR_RXFULL_IE | IOP3XX_ICR_TXEMPTY_IE); __raw_writel(cr, adapter_data->ioaddr + CR_OFFSET); - iounmap((void __iomem*)adapter_data->ioaddr); + iounmap(adapter_data->ioaddr); release_mem_region(res->start, IOP3XX_I2C_IO_SIZE); kfree(adapter_data); kfree(padapter); @@ -453,7 +453,7 @@ iop3xx_i2c_probe(struct platform_device *pdev) /* set the adapter enumeration # */ adapter_data->id = i2c_id++; - adapter_data->ioaddr = (u32)ioremap(res->start, IOP3XX_I2C_IO_SIZE); + adapter_data->ioaddr = ioremap(res->start, IOP3XX_I2C_IO_SIZE); if (!adapter_data->ioaddr) { ret = -ENOMEM; goto release_region; @@ -498,7 +498,7 @@ iop3xx_i2c_probe(struct platform_device *pdev) return 0; unmap: - iounmap((void __iomem*)adapter_data->ioaddr); + iounmap(adapter_data->ioaddr); release_region: release_mem_region(res->start, IOP3XX_I2C_IO_SIZE); diff --git a/drivers/i2c/busses/i2c-iop3xx.h b/drivers/i2c/busses/i2c-iop3xx.h index 8485861f6a36..097e270955d0 100644 --- a/drivers/i2c/busses/i2c-iop3xx.h +++ b/drivers/i2c/busses/i2c-iop3xx.h @@ -97,7 +97,7 @@ #define IOP3XX_I2C_IO_SIZE 0x18 struct i2c_algo_iop3xx_data { - u32 ioaddr; + void __iomem *ioaddr; wait_queue_head_t waitq; spinlock_t lock; u32 SR_enabled, SR_received; diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c index 16242063144f..a9941c65f226 100644 --- a/drivers/i2c/busses/i2c-mv64xxx.c +++ b/drivers/i2c/busses/i2c-mv64xxx.c @@ -59,6 +59,7 @@ enum { MV64XXX_I2C_STATE_INVALID, MV64XXX_I2C_STATE_IDLE, MV64XXX_I2C_STATE_WAITING_FOR_START_COND, + MV64XXX_I2C_STATE_WAITING_FOR_RESTART, MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK, MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK, MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK, @@ -70,6 +71,7 @@ enum { MV64XXX_I2C_ACTION_INVALID, MV64XXX_I2C_ACTION_CONTINUE, MV64XXX_I2C_ACTION_SEND_START, + MV64XXX_I2C_ACTION_SEND_RESTART, MV64XXX_I2C_ACTION_SEND_ADDR_1, MV64XXX_I2C_ACTION_SEND_ADDR_2, MV64XXX_I2C_ACTION_SEND_DATA, @@ -91,6 +93,7 @@ struct mv64xxx_i2c_data { u32 addr2; u32 bytes_left; u32 byte_posn; + u32 send_stop; u32 block; int rc; u32 freq_m; @@ -159,8 +162,15 @@ mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status) if ((drv_data->bytes_left == 0) || (drv_data->aborting && (drv_data->byte_posn != 0))) { - drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; - drv_data->state = MV64XXX_I2C_STATE_IDLE; + if (drv_data->send_stop) { + drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; + drv_data->state = MV64XXX_I2C_STATE_IDLE; + } else { + drv_data->action = + MV64XXX_I2C_ACTION_SEND_RESTART; + drv_data->state = + MV64XXX_I2C_STATE_WAITING_FOR_RESTART; + } } else { drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA; drv_data->state = @@ -228,6 +238,15 @@ static void mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data) { switch(drv_data->action) { + case MV64XXX_I2C_ACTION_SEND_RESTART: + drv_data->cntl_bits |= MV64XXX_I2C_REG_CONTROL_START; + drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN; + writel(drv_data->cntl_bits, + drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); + drv_data->block = 0; + wake_up_interruptible(&drv_data->waitq); + break; + case MV64XXX_I2C_ACTION_CONTINUE: writel(drv_data->cntl_bits, drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); @@ -386,7 +405,8 @@ mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data) } static int -mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg) +mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg, + int is_first, int is_last) { unsigned long flags; @@ -406,10 +426,18 @@ mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg) drv_data->bytes_left--; } } else { - drv_data->action = MV64XXX_I2C_ACTION_SEND_START; - drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND; + if (is_first) { + drv_data->action = MV64XXX_I2C_ACTION_SEND_START; + drv_data->state = + MV64XXX_I2C_STATE_WAITING_FOR_START_COND; + } else { + drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_1; + drv_data->state = + MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK; + } } + drv_data->send_stop = is_last; drv_data->block = 1; mv64xxx_i2c_do_action(drv_data); spin_unlock_irqrestore(&drv_data->lock, flags); @@ -437,9 +465,12 @@ mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap); int i, rc; - for (i=0; i<num; i++) - if ((rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i])) < 0) + for (i = 0; i < num; i++) { + rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i], + i == 0, i + 1 == num); + if (rc < 0) return rc; + } return num; } diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c index 2bd3469b3071..594ed5059c4a 100644 --- a/drivers/i2c/busses/i2c-nomadik.c +++ b/drivers/i2c/busses/i2c-nomadik.c @@ -872,6 +872,8 @@ static int __devinit nmk_i2c_probe(struct platform_device *pdev) adap->owner = THIS_MODULE; adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; adap->algo = &nmk_i2c_algo; + snprintf(adap->name, sizeof(adap->name), + "Nomadik I2C%d at %lx", pdev->id, (unsigned long)res->start); /* fetch the controller id */ adap->nr = pdev->id; @@ -891,8 +893,8 @@ static int __devinit nmk_i2c_probe(struct platform_device *pdev) goto err_init_hw; } - dev_dbg(&pdev->dev, "initialize I2C%d bus on virtual " - "base %p\n", pdev->id, dev->virtbase); + dev_info(&pdev->dev, "initialize %s on virtual " + "base %p\n", adap->name, dev->virtbase); ret = i2c_add_numbered_adapter(adap); if (ret) { diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c index 0070371b29f3..ef3bcb1ce864 100644 --- a/drivers/i2c/busses/i2c-ocores.c +++ b/drivers/i2c/busses/i2c-ocores.c @@ -9,6 +9,41 @@ * kind, whether express or implied. */ +/* + * Device tree configuration: + * + * Required properties: + * - compatible : "opencores,i2c-ocores" + * - reg : bus address start and address range size of device + * - interrupts : interrupt number + * - regstep : size of device registers in bytes + * - clock-frequency : frequency of bus clock in Hz + * + * Example: + * + * i2c0: ocores@a0000000 { + * compatible = "opencores,i2c-ocores"; + * reg = <0xa0000000 0x8>; + * interrupts = <10>; + * + * regstep = <1>; + * clock-frequency = <20000000>; + * + * -- Devices connected on this I2C bus get + * -- defined here; address- and size-cells + * -- apply to these child devices + * + * #address-cells = <1>; + * #size-cells = <0>; + * + * dummy@60 { + * compatible = "dummy"; + * reg = <60>; + * }; + * }; + * + */ + #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> @@ -210,6 +245,32 @@ static struct i2c_adapter ocores_adapter = { .algo = &ocores_algorithm, }; +#ifdef CONFIG_OF +static int ocores_i2c_of_probe(struct platform_device* pdev, + struct ocores_i2c* i2c) +{ + __be32* val; + + val = of_get_property(pdev->dev.of_node, "regstep", NULL); + if (!val) { + dev_err(&pdev->dev, "Missing required parameter 'regstep'"); + return -ENODEV; + } + i2c->regstep = be32_to_cpup(val); + + val = of_get_property(pdev->dev.of_node, "clock-frequency", NULL); + if (!val) { + dev_err(&pdev->dev, + "Missing required parameter 'clock-frequency'"); + return -ENODEV; + } + i2c->clock_khz = be32_to_cpup(val) / 1000; + + return 0; +} +#else +#define ocores_i2c_of_probe(pdev,i2c) -ENODEV +#endif static int __devinit ocores_i2c_probe(struct platform_device *pdev) { @@ -227,37 +288,41 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev) if (!res2) return -ENODEV; - pdata = (struct ocores_i2c_platform_data*) pdev->dev.platform_data; - if (!pdata) - return -ENODEV; - - i2c = kzalloc(sizeof(*i2c), GFP_KERNEL); + i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL); if (!i2c) return -ENOMEM; - if (!request_mem_region(res->start, resource_size(res), - pdev->name)) { + if (!devm_request_mem_region(&pdev->dev, res->start, + resource_size(res), pdev->name)) { dev_err(&pdev->dev, "Memory region busy\n"); - ret = -EBUSY; - goto request_mem_failed; + return -EBUSY; } - i2c->base = ioremap(res->start, resource_size(res)); + i2c->base = devm_ioremap_nocache(&pdev->dev, res->start, + resource_size(res)); if (!i2c->base) { dev_err(&pdev->dev, "Unable to map registers\n"); - ret = -EIO; - goto map_failed; + return -EIO; + } + + pdata = pdev->dev.platform_data; + if (pdata) { + i2c->regstep = pdata->regstep; + i2c->clock_khz = pdata->clock_khz; + } else { + ret = ocores_i2c_of_probe(pdev, i2c); + if (ret) + return ret; } - i2c->regstep = pdata->regstep; - i2c->clock_khz = pdata->clock_khz; ocores_init(i2c); init_waitqueue_head(&i2c->wait); - ret = request_irq(res2->start, ocores_isr, 0, pdev->name, i2c); + ret = devm_request_irq(&pdev->dev, res2->start, ocores_isr, 0, + pdev->name, i2c); if (ret) { dev_err(&pdev->dev, "Cannot claim IRQ\n"); - goto request_irq_failed; + return ret; } /* hook up driver to tree */ @@ -265,36 +330,29 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev) i2c->adap = ocores_adapter; i2c_set_adapdata(&i2c->adap, i2c); i2c->adap.dev.parent = &pdev->dev; +#ifdef CONFIG_OF + i2c->adap.dev.of_node = pdev->dev.of_node; +#endif /* add i2c adapter to i2c tree */ ret = i2c_add_adapter(&i2c->adap); if (ret) { dev_err(&pdev->dev, "Failed to add adapter\n"); - goto add_adapter_failed; + return ret; } /* add in known devices to the bus */ - for (i = 0; i < pdata->num_devices; i++) - i2c_new_device(&i2c->adap, pdata->devices + i); + if (pdata) { + for (i = 0; i < pdata->num_devices; i++) + i2c_new_device(&i2c->adap, pdata->devices + i); + } return 0; - -add_adapter_failed: - free_irq(res2->start, i2c); -request_irq_failed: - iounmap(i2c->base); -map_failed: - release_mem_region(res->start, resource_size(res)); -request_mem_failed: - kfree(i2c); - - return ret; } static int __devexit ocores_i2c_remove(struct platform_device* pdev) { struct ocores_i2c *i2c = platform_get_drvdata(pdev); - struct resource *res; /* disable i2c logic */ oc_setreg(i2c, OCI2C_CONTROL, oc_getreg(i2c, OCI2C_CONTROL) @@ -304,18 +362,6 @@ static int __devexit ocores_i2c_remove(struct platform_device* pdev) i2c_del_adapter(&i2c->adap); platform_set_drvdata(pdev, NULL); - res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (res) - free_irq(res->start, i2c); - - iounmap(i2c->base); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res) - release_mem_region(res->start, resource_size(res)); - - kfree(i2c); - return 0; } @@ -344,6 +390,16 @@ static int ocores_i2c_resume(struct platform_device *pdev) #define ocores_i2c_resume NULL #endif +#ifdef CONFIG_OF +static struct of_device_id ocores_i2c_match[] = { + { + .compatible = "opencores,i2c-ocores", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, ocores_i2c_match); +#endif + /* work with hotplug and coldplug */ MODULE_ALIAS("platform:ocores-i2c"); @@ -355,6 +411,9 @@ static struct platform_driver ocores_i2c_driver = { .driver = { .owner = THIS_MODULE, .name = "ocores-i2c", +#ifdef CONFIG_OF + .of_match_table = ocores_i2c_match, +#endif }, }; diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 9d090833e245..b605ff3a1fa0 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -598,12 +598,8 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap, * REVISIT: We should abort the transfer on signals, but the bus goes * into arbitration and we're currently unable to recover from it. */ - if (dev->set_mpu_wkup_lat != NULL) - dev->set_mpu_wkup_lat(dev->dev, dev->latency); r = wait_for_completion_timeout(&dev->cmd_complete, OMAP_I2C_TIMEOUT); - if (dev->set_mpu_wkup_lat != NULL) - dev->set_mpu_wkup_lat(dev->dev, -1); dev->buf_len = 0; if (r < 0) return r; @@ -654,12 +650,18 @@ omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) if (r < 0) goto out; + if (dev->set_mpu_wkup_lat != NULL) + dev->set_mpu_wkup_lat(dev->dev, dev->latency); + for (i = 0; i < num; i++) { r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1))); if (r != 0) break; } + if (dev->set_mpu_wkup_lat != NULL) + dev->set_mpu_wkup_lat(dev->dev, -1); + if (r == 0) r = num; |