diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-intel-mid.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-intel-mid.c | 1121 |
1 files changed, 0 insertions, 1121 deletions
diff --git a/drivers/i2c/busses/i2c-intel-mid.c b/drivers/i2c/busses/i2c-intel-mid.c deleted file mode 100644 index 0fb659726ffc..000000000000 --- a/drivers/i2c/busses/i2c-intel-mid.c +++ /dev/null @@ -1,1121 +0,0 @@ -/* - * Support for Moorestown/Medfield I2C chip - * - * Copyright (c) 2009 Intel Corporation. - * Copyright (c) 2009 Synopsys. Inc. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, version - * 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope 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., 51 - * Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. - * - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/err.h> -#include <linux/slab.h> -#include <linux/stat.h> -#include <linux/delay.h> -#include <linux/i2c.h> -#include <linux/init.h> -#include <linux/pci.h> -#include <linux/interrupt.h> -#include <linux/pm_runtime.h> -#include <linux/io.h> - -#define DRIVER_NAME "i2c-intel-mid" -#define VERSION "Version 0.5ac2" -#define PLATFORM "Moorestown/Medfield" - -/* Tables use: 0 Moorestown, 1 Medfield */ -#define NUM_PLATFORMS 2 -enum platform_enum { - MOORESTOWN = 0, - MEDFIELD = 1, -}; - -enum mid_i2c_status { - STATUS_IDLE = 0, - STATUS_READ_START, - STATUS_READ_IN_PROGRESS, - STATUS_READ_SUCCESS, - STATUS_WRITE_START, - STATUS_WRITE_SUCCESS, - STATUS_XFER_ABORT, - STATUS_STANDBY -}; - -/** - * struct intel_mid_i2c_private - per device I²C context - * @adap: core i2c layer adapter information - * @dev: device reference for power management - * @base: register base - * @speed: speed mode for this port - * @complete: completion object for transaction wait - * @abort: reason for last abort - * @rx_buf: pointer into working receive buffer - * @rx_buf_len: receive buffer length - * @status: adapter state machine - * @msg: the message we are currently processing - * @platform: the MID device type we are part of - * @lock: transaction serialization - * - * We allocate one of these per device we discover, it holds the core - * i2c layer objects and the data we need to track privately. - */ -struct intel_mid_i2c_private { - struct i2c_adapter adap; - struct device *dev; - void __iomem *base; - int speed; - struct completion complete; - int abort; - u8 *rx_buf; - int rx_buf_len; - enum mid_i2c_status status; - struct i2c_msg *msg; - enum platform_enum platform; - struct mutex lock; -}; - -#define NUM_SPEEDS 3 - -#define ACTIVE 0 -#define STANDBY 1 - - -/* Control register */ -#define IC_CON 0x00 -#define SLV_DIS (1 << 6) /* Disable slave mode */ -#define RESTART (1 << 5) /* Send a Restart condition */ -#define ADDR_10BIT (1 << 4) /* 10-bit addressing */ -#define STANDARD_MODE (1 << 1) /* standard mode */ -#define FAST_MODE (2 << 1) /* fast mode */ -#define HIGH_MODE (3 << 1) /* high speed mode */ -#define MASTER_EN (1 << 0) /* Master mode */ - -/* Target address register */ -#define IC_TAR 0x04 -#define IC_TAR_10BIT_ADDR (1 << 12) /* 10-bit addressing */ -#define IC_TAR_SPECIAL (1 << 11) /* Perform special I2C cmd */ -#define IC_TAR_GC_OR_START (1 << 10) /* 0: Gerneral Call Address */ - /* 1: START BYTE */ -/* Slave Address Register */ -#define IC_SAR 0x08 /* Not used in Master mode */ - -/* High Speed Master Mode Code Address Register */ -#define IC_HS_MADDR 0x0c - -/* Rx/Tx Data Buffer and Command Register */ -#define IC_DATA_CMD 0x10 -#define IC_RD (1 << 8) /* 1: Read 0: Write */ - -/* Standard Speed Clock SCL High Count Register */ -#define IC_SS_SCL_HCNT 0x14 - -/* Standard Speed Clock SCL Low Count Register */ -#define IC_SS_SCL_LCNT 0x18 - -/* Fast Speed Clock SCL High Count Register */ -#define IC_FS_SCL_HCNT 0x1c - -/* Fast Spedd Clock SCL Low Count Register */ -#define IC_FS_SCL_LCNT 0x20 - -/* High Speed Clock SCL High Count Register */ -#define IC_HS_SCL_HCNT 0x24 - -/* High Speed Clock SCL Low Count Register */ -#define IC_HS_SCL_LCNT 0x28 - -/* Interrupt Status Register */ -#define IC_INTR_STAT 0x2c /* Read only */ -#define R_GEN_CALL (1 << 11) -#define R_START_DET (1 << 10) -#define R_STOP_DET (1 << 9) -#define R_ACTIVITY (1 << 8) -#define R_RX_DONE (1 << 7) -#define R_TX_ABRT (1 << 6) -#define R_RD_REQ (1 << 5) -#define R_TX_EMPTY (1 << 4) -#define R_TX_OVER (1 << 3) -#define R_RX_FULL (1 << 2) -#define R_RX_OVER (1 << 1) -#define R_RX_UNDER (1 << 0) - -/* Interrupt Mask Register */ -#define IC_INTR_MASK 0x30 /* Read and Write */ -#define M_GEN_CALL (1 << 11) -#define M_START_DET (1 << 10) -#define M_STOP_DET (1 << 9) -#define M_ACTIVITY (1 << 8) -#define M_RX_DONE (1 << 7) -#define M_TX_ABRT (1 << 6) -#define M_RD_REQ (1 << 5) -#define M_TX_EMPTY (1 << 4) -#define M_TX_OVER (1 << 3) -#define M_RX_FULL (1 << 2) -#define M_RX_OVER (1 << 1) -#define M_RX_UNDER (1 << 0) - -/* Raw Interrupt Status Register */ -#define IC_RAW_INTR_STAT 0x34 /* Read Only */ -#define GEN_CALL (1 << 11) /* General call */ -#define START_DET (1 << 10) /* (RE)START occurred */ -#define STOP_DET (1 << 9) /* STOP occurred */ -#define ACTIVITY (1 << 8) /* Bus busy */ -#define RX_DONE (1 << 7) /* Not used in Master mode */ -#define TX_ABRT (1 << 6) /* Transmit Abort */ -#define RD_REQ (1 << 5) /* Not used in Master mode */ -#define TX_EMPTY (1 << 4) /* TX FIFO <= threshold */ -#define TX_OVER (1 << 3) /* TX FIFO overflow */ -#define RX_FULL (1 << 2) /* RX FIFO >= threshold */ -#define RX_OVER (1 << 1) /* RX FIFO overflow */ -#define RX_UNDER (1 << 0) /* RX FIFO empty */ - -/* Receive FIFO Threshold Register */ -#define IC_RX_TL 0x38 - -/* Transmit FIFO Treshold Register */ -#define IC_TX_TL 0x3c - -/* Clear Combined and Individual Interrupt Register */ -#define IC_CLR_INTR 0x40 -#define CLR_INTR (1 << 0) - -/* Clear RX_UNDER Interrupt Register */ -#define IC_CLR_RX_UNDER 0x44 -#define CLR_RX_UNDER (1 << 0) - -/* Clear RX_OVER Interrupt Register */ -#define IC_CLR_RX_OVER 0x48 -#define CLR_RX_OVER (1 << 0) - -/* Clear TX_OVER Interrupt Register */ -#define IC_CLR_TX_OVER 0x4c -#define CLR_TX_OVER (1 << 0) - -#define IC_CLR_RD_REQ 0x50 - -/* Clear TX_ABRT Interrupt Register */ -#define IC_CLR_TX_ABRT 0x54 -#define CLR_TX_ABRT (1 << 0) -#define IC_CLR_RX_DONE 0x58 - -/* Clear ACTIVITY Interrupt Register */ -#define IC_CLR_ACTIVITY 0x5c -#define CLR_ACTIVITY (1 << 0) - -/* Clear STOP_DET Interrupt Register */ -#define IC_CLR_STOP_DET 0x60 -#define CLR_STOP_DET (1 << 0) - -/* Clear START_DET Interrupt Register */ -#define IC_CLR_START_DET 0x64 -#define CLR_START_DET (1 << 0) - -/* Clear GEN_CALL Interrupt Register */ -#define IC_CLR_GEN_CALL 0x68 -#define CLR_GEN_CALL (1 << 0) - -/* Enable Register */ -#define IC_ENABLE 0x6c -#define ENABLE (1 << 0) - -/* Status Register */ -#define IC_STATUS 0x70 /* Read Only */ -#define STAT_SLV_ACTIVITY (1 << 6) /* Slave not in idle */ -#define STAT_MST_ACTIVITY (1 << 5) /* Master not in idle */ -#define STAT_RFF (1 << 4) /* RX FIFO Full */ -#define STAT_RFNE (1 << 3) /* RX FIFO Not Empty */ -#define STAT_TFE (1 << 2) /* TX FIFO Empty */ -#define STAT_TFNF (1 << 1) /* TX FIFO Not Full */ -#define STAT_ACTIVITY (1 << 0) /* Activity Status */ - -/* Transmit FIFO Level Register */ -#define IC_TXFLR 0x74 /* Read Only */ -#define TXFLR (1 << 0) /* TX FIFO level */ - -/* Receive FIFO Level Register */ -#define IC_RXFLR 0x78 /* Read Only */ -#define RXFLR (1 << 0) /* RX FIFO level */ - -/* Transmit Abort Source Register */ -#define IC_TX_ABRT_SOURCE 0x80 -#define ABRT_SLVRD_INTX (1 << 15) -#define ABRT_SLV_ARBLOST (1 << 14) -#define ABRT_SLVFLUSH_TXFIFO (1 << 13) -#define ARB_LOST (1 << 12) -#define ABRT_MASTER_DIS (1 << 11) -#define ABRT_10B_RD_NORSTRT (1 << 10) -#define ABRT_SBYTE_NORSTRT (1 << 9) -#define ABRT_HS_NORSTRT (1 << 8) -#define ABRT_SBYTE_ACKDET (1 << 7) -#define ABRT_HS_ACKDET (1 << 6) -#define ABRT_GCALL_READ (1 << 5) -#define ABRT_GCALL_NOACK (1 << 4) -#define ABRT_TXDATA_NOACK (1 << 3) -#define ABRT_10ADDR2_NOACK (1 << 2) -#define ABRT_10ADDR1_NOACK (1 << 1) -#define ABRT_7B_ADDR_NOACK (1 << 0) - -/* Enable Status Register */ -#define IC_ENABLE_STATUS 0x9c -#define IC_EN (1 << 0) /* I2C in an enabled state */ - -/* Component Parameter Register 1*/ -#define IC_COMP_PARAM_1 0xf4 -#define APB_DATA_WIDTH (0x3 << 0) - -/* added by xiaolin --begin */ -#define SS_MIN_SCL_HIGH 4000 -#define SS_MIN_SCL_LOW 4700 -#define FS_MIN_SCL_HIGH 600 -#define FS_MIN_SCL_LOW 1300 -#define HS_MIN_SCL_HIGH_100PF 60 -#define HS_MIN_SCL_LOW_100PF 120 - -#define STANDARD 0 -#define FAST 1 -#define HIGH 2 - -#define NUM_SPEEDS 3 - -static int speed_mode[6] = { - FAST, - FAST, - FAST, - STANDARD, - FAST, - FAST -}; - -static int ctl_num = 6; -module_param_array(speed_mode, int, &ctl_num, S_IRUGO); -MODULE_PARM_DESC(speed_mode, "Set the speed of the i2c interface (0-2)"); - -/** - * intel_mid_i2c_disable - Disable I2C controller - * @adap: struct pointer to i2c_adapter - * - * Return Value: - * 0 success - * -EBUSY if device is busy - * -ETIMEDOUT if i2c cannot be disabled within the given time - * - * I2C bus state should be checked prior to disabling the hardware. If bus is - * not in idle state, an errno is returned. Write "0" to IC_ENABLE to disable - * I2C controller. - */ -static int intel_mid_i2c_disable(struct i2c_adapter *adap) -{ - struct intel_mid_i2c_private *i2c = i2c_get_adapdata(adap); - int err = 0; - int count = 0; - int ret1, ret2; - static const u16 delay[NUM_SPEEDS] = {100, 25, 3}; - - /* Set IC_ENABLE to 0 */ - writel(0, i2c->base + IC_ENABLE); - - /* Check if device is busy */ - dev_dbg(&adap->dev, "mrst i2c disable\n"); - while ((ret1 = readl(i2c->base + IC_ENABLE_STATUS) & 0x1) - || (ret2 = readl(i2c->base + IC_STATUS) & 0x1)) { - udelay(delay[i2c->speed]); - writel(0, i2c->base + IC_ENABLE); - dev_dbg(&adap->dev, "i2c is busy, count is %d speed %d\n", - count, i2c->speed); - if (count++ > 10) { - err = -ETIMEDOUT; - break; - } - } - - /* Clear all interrupts */ - readl(i2c->base + IC_CLR_INTR); - readl(i2c->base + IC_CLR_STOP_DET); - readl(i2c->base + IC_CLR_START_DET); - readl(i2c->base + IC_CLR_ACTIVITY); - readl(i2c->base + IC_CLR_TX_ABRT); - readl(i2c->base + IC_CLR_RX_OVER); - readl(i2c->base + IC_CLR_RX_UNDER); - readl(i2c->base + IC_CLR_TX_OVER); - readl(i2c->base + IC_CLR_RX_DONE); - readl(i2c->base + IC_CLR_GEN_CALL); - - /* Disable all interupts */ - writel(0x0000, i2c->base + IC_INTR_MASK); - - return err; -} - -/** - * intel_mid_i2c_hwinit - Initialize the I2C hardware registers - * @dev: pci device struct pointer - * - * This function will be called in intel_mid_i2c_probe() before device - * registration. - * - * Return Values: - * 0 success - * -EBUSY i2c cannot be disabled - * -ETIMEDOUT i2c cannot be disabled - * -EFAULT If APB data width is not 32-bit wide - * - * I2C should be disabled prior to other register operation. If failed, an - * errno is returned. Mask and Clear all interrpts, this should be done at - * first. Set common registers which will not be modified during normal - * transfers, including: control register, FIFO threshold and clock freq. - * Check APB data width at last. - */ -static int intel_mid_i2c_hwinit(struct intel_mid_i2c_private *i2c) -{ - int err; - - static const u16 hcnt[NUM_PLATFORMS][NUM_SPEEDS] = { - { 0x75, 0x15, 0x07 }, - { 0x04c, 0x10, 0x06 } - }; - static const u16 lcnt[NUM_PLATFORMS][NUM_SPEEDS] = { - { 0x7C, 0x21, 0x0E }, - { 0x053, 0x19, 0x0F } - }; - - /* Disable i2c first */ - err = intel_mid_i2c_disable(&i2c->adap); - if (err) - return err; - - /* - * Setup clock frequency and speed mode - * Enable restart condition, - * enable master FSM, disable slave FSM, - * use target address when initiating transfer - */ - - writel((i2c->speed + 1) << 1 | SLV_DIS | RESTART | MASTER_EN, - i2c->base + IC_CON); - writel(hcnt[i2c->platform][i2c->speed], - i2c->base + (IC_SS_SCL_HCNT + (i2c->speed << 3))); - writel(lcnt[i2c->platform][i2c->speed], - i2c->base + (IC_SS_SCL_LCNT + (i2c->speed << 3))); - - /* Set tranmit & receive FIFO threshold to zero */ - writel(0x0, i2c->base + IC_RX_TL); - writel(0x0, i2c->base + IC_TX_TL); - - return 0; -} - -/** - * intel_mid_i2c_func - Return the supported three I2C operations. - * @adapter: i2c_adapter struct pointer - */ -static u32 intel_mid_i2c_func(struct i2c_adapter *adapter) -{ - return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL; -} - -/** - * intel_mid_i2c_address_neq - To check if the addresses for different i2c messages - * are equal. - * @p1: first i2c_msg - * @p2: second i2c_msg - * - * Return Values: - * 0 if addresses are equal - * 1 if not equal - * - * Within a single transfer, the I2C client may need to send its address more - * than once. So a check if the addresses match is needed. - */ -static inline bool intel_mid_i2c_address_neq(const struct i2c_msg *p1, - const struct i2c_msg *p2) -{ - if (p1->addr != p2->addr) - return 1; - if ((p1->flags ^ p2->flags) & I2C_M_TEN) - return 1; - return 0; -} - -/** - * intel_mid_i2c_abort - To handle transfer abortions and print error messages. - * @adap: i2c_adapter struct pointer - * - * By reading register IC_TX_ABRT_SOURCE, various transfer errors can be - * distingushed. At present, no circumstances have been found out that - * multiple errors would be occurred simutaneously, so we simply use the - * register value directly. - * - * At last the error bits are cleared. (Note clear ABRT_SBYTE_NORSTRT bit need - * a few extra steps) - */ -static void intel_mid_i2c_abort(struct intel_mid_i2c_private *i2c) -{ - /* Read about source register */ - int abort = i2c->abort; - struct i2c_adapter *adap = &i2c->adap; - - /* Single transfer error check: - * According to databook, TX/RX FIFOs would be flushed when - * the abort interrupt occurred. - */ - if (abort & ABRT_MASTER_DIS) - dev_err(&adap->dev, - "initiate master operation with master mode disabled.\n"); - if (abort & ABRT_10B_RD_NORSTRT) - dev_err(&adap->dev, - "RESTART disabled and master sent READ cmd in 10-bit addressing.\n"); - - if (abort & ABRT_SBYTE_NORSTRT) { - dev_err(&adap->dev, - "RESTART disabled and user is trying to send START byte.\n"); - writel(~ABRT_SBYTE_NORSTRT, i2c->base + IC_TX_ABRT_SOURCE); - writel(RESTART, i2c->base + IC_CON); - writel(~IC_TAR_SPECIAL, i2c->base + IC_TAR); - } - - if (abort & ABRT_SBYTE_ACKDET) - dev_err(&adap->dev, - "START byte was not acknowledged.\n"); - if (abort & ABRT_TXDATA_NOACK) - dev_dbg(&adap->dev, - "No acknowledgement received from slave.\n"); - if (abort & ABRT_10ADDR2_NOACK) - dev_dbg(&adap->dev, - "The 2nd address byte of the 10-bit address was not acknowledged.\n"); - if (abort & ABRT_10ADDR1_NOACK) - dev_dbg(&adap->dev, - "The 1st address byte of 10-bit address was not acknowledged.\n"); - if (abort & ABRT_7B_ADDR_NOACK) - dev_dbg(&adap->dev, - "I2C slave device not acknowledged.\n"); - - /* Clear TX_ABRT bit */ - readl(i2c->base + IC_CLR_TX_ABRT); - i2c->status = STATUS_XFER_ABORT; -} - -/** - * xfer_read - Internal function to implement master read transfer. - * @adap: i2c_adapter struct pointer - * @buf: buffer in i2c_msg - * @length: number of bytes to be read - * - * Return Values: - * 0 if the read transfer succeeds - * -ETIMEDOUT if cannot read the "raw" interrupt register - * -EINVAL if a transfer abort occurred - * - * For every byte, a "READ" command will be loaded into IC_DATA_CMD prior to - * data transfer. The actual "read" operation will be performed if an RX_FULL - * interrupt occurred. - * - * Note there may be two interrupt signals captured, one should read - * IC_RAW_INTR_STAT to separate between errors and actual data. - */ -static int xfer_read(struct i2c_adapter *adap, unsigned char *buf, int length) -{ - struct intel_mid_i2c_private *i2c = i2c_get_adapdata(adap); - int i = length; - int err; - - if (length >= 256) { - dev_err(&adap->dev, - "I2C FIFO cannot support larger than 256 bytes\n"); - return -EMSGSIZE; - } - - INIT_COMPLETION(i2c->complete); - - readl(i2c->base + IC_CLR_INTR); - writel(0x0044, i2c->base + IC_INTR_MASK); - - i2c->status = STATUS_READ_START; - - while (i--) - writel(IC_RD, i2c->base + IC_DATA_CMD); - - i2c->status = STATUS_READ_START; - err = wait_for_completion_interruptible_timeout(&i2c->complete, HZ); - if (!err) { - dev_err(&adap->dev, "Timeout for ACK from I2C slave device\n"); - intel_mid_i2c_hwinit(i2c); - return -ETIMEDOUT; - } - if (i2c->status == STATUS_READ_SUCCESS) - return 0; - else - return -EIO; -} - -/** - * xfer_write - Internal function to implement master write transfer. - * @adap: i2c_adapter struct pointer - * @buf: buffer in i2c_msg - * @length: number of bytes to be read - * - * Return Values: - * 0 if the read transfer succeeds - * -ETIMEDOUT if we cannot read the "raw" interrupt register - * -EINVAL if a transfer abort occurred - * - * For every byte, a "WRITE" command will be loaded into IC_DATA_CMD prior to - * data transfer. The actual "write" operation will be performed when the - * RX_FULL interrupt signal occurs. - * - * Note there may be two interrupt signals captured, one should read - * IC_RAW_INTR_STAT to separate between errors and actual data. - */ -static int xfer_write(struct i2c_adapter *adap, - unsigned char *buf, int length) -{ - struct intel_mid_i2c_private *i2c = i2c_get_adapdata(adap); - int i, err; - - if (length >= 256) { - dev_err(&adap->dev, - "I2C FIFO cannot support larger than 256 bytes\n"); - return -EMSGSIZE; - } - - INIT_COMPLETION(i2c->complete); - - readl(i2c->base + IC_CLR_INTR); - writel(0x0050, i2c->base + IC_INTR_MASK); - - i2c->status = STATUS_WRITE_START; - for (i = 0; i < length; i++) - writel((u16)(*(buf + i)), i2c->base + IC_DATA_CMD); - - i2c->status = STATUS_WRITE_START; - err = wait_for_completion_interruptible_timeout(&i2c->complete, HZ); - if (!err) { - dev_err(&adap->dev, "Timeout for ACK from I2C slave device\n"); - intel_mid_i2c_hwinit(i2c); - return -ETIMEDOUT; - } else { - if (i2c->status == STATUS_WRITE_SUCCESS) - return 0; - else - return -EIO; - } -} - -static int intel_mid_i2c_setup(struct i2c_adapter *adap, struct i2c_msg *pmsg) -{ - struct intel_mid_i2c_private *i2c = i2c_get_adapdata(adap); - int err; - u32 reg; - u32 bit_mask; - u32 mode; - - /* Disable device first */ - err = intel_mid_i2c_disable(adap); - if (err) { - dev_err(&adap->dev, - "Cannot disable i2c controller, timeout\n"); - return err; - } - - mode = (1 + i2c->speed) << 1; - /* set the speed mode */ - reg = readl(i2c->base + IC_CON); - if ((reg & 0x06) != mode) { - dev_dbg(&adap->dev, "set mode %d\n", i2c->speed); - writel((reg & ~0x6) | mode, i2c->base + IC_CON); - } - - reg = readl(i2c->base + IC_CON); - /* use 7-bit addressing */ - if (pmsg->flags & I2C_M_TEN) { - if ((reg & ADDR_10BIT) != ADDR_10BIT) { - dev_dbg(&adap->dev, "set i2c 10 bit address mode\n"); - writel(reg | ADDR_10BIT, i2c->base + IC_CON); - } - } else { - if ((reg & ADDR_10BIT) != 0x0) { - dev_dbg(&adap->dev, "set i2c 7 bit address mode\n"); - writel(reg & ~ADDR_10BIT, i2c->base + IC_CON); - } - } - /* enable restart conditions */ - reg = readl(i2c->base + IC_CON); - if ((reg & RESTART) != RESTART) { - dev_dbg(&adap->dev, "enable restart conditions\n"); - writel(reg | RESTART, i2c->base + IC_CON); - } - - /* enable master FSM */ - reg = readl(i2c->base + IC_CON); - dev_dbg(&adap->dev, "ic_con reg is 0x%x\n", reg); - writel(reg | MASTER_EN, i2c->base + IC_CON); - if ((reg & SLV_DIS) != SLV_DIS) { - dev_dbg(&adap->dev, "enable master FSM\n"); - writel(reg | SLV_DIS, i2c->base + IC_CON); - dev_dbg(&adap->dev, "ic_con reg is 0x%x\n", reg); - } - - /* use target address when initiating transfer */ - reg = readl(i2c->base + IC_TAR); - bit_mask = IC_TAR_SPECIAL | IC_TAR_GC_OR_START; - - if ((reg & bit_mask) != 0x0) { - dev_dbg(&adap->dev, - "WR: use target address when intiating transfer, i2c_tx_target\n"); - writel(reg & ~bit_mask, i2c->base + IC_TAR); - } - - /* set target address to the I2C slave address */ - dev_dbg(&adap->dev, - "set target address to the I2C slave address, addr is %x\n", - pmsg->addr); - writel(pmsg->addr | (pmsg->flags & I2C_M_TEN ? IC_TAR_10BIT_ADDR : 0), - i2c->base + IC_TAR); - - /* Enable I2C controller */ - writel(ENABLE, i2c->base + IC_ENABLE); - - return 0; -} - -/** - * intel_mid_i2c_xfer - Main master transfer routine. - * @adap: i2c_adapter struct pointer - * @pmsg: i2c_msg struct pointer - * @num: number of i2c_msg - * - * Return Values: - * + number of messages transferred - * -ETIMEDOUT If cannot disable I2C controller or read IC_STATUS - * -EINVAL If the address in i2c_msg is invalid - * - * This function will be registered in i2c-core and exposed to external - * I2C clients. - * 1. Disable I2C controller - * 2. Unmask three interrupts: RX_FULL, TX_EMPTY, TX_ABRT - * 3. Check if address in i2c_msg is valid - * 4. Enable I2C controller - * 5. Perform real transfer (call xfer_read or xfer_write) - * 6. Wait until the current transfer is finished (check bus state) - * 7. Mask and clear all interrupts - */ -static int intel_mid_i2c_xfer(struct i2c_adapter *adap, - struct i2c_msg *pmsg, - int num) -{ - struct intel_mid_i2c_private *i2c = i2c_get_adapdata(adap); - int i, err = 0; - - /* if number of messages equal 0*/ - if (num == 0) - return 0; - - pm_runtime_get(i2c->dev); - - mutex_lock(&i2c->lock); - dev_dbg(&adap->dev, "intel_mid_i2c_xfer, process %d msg(s)\n", num); - dev_dbg(&adap->dev, "slave address is %x\n", pmsg->addr); - - - if (i2c->status != STATUS_IDLE) { - dev_err(&adap->dev, "Adapter %d in transfer/standby\n", - adap->nr); - mutex_unlock(&i2c->lock); - pm_runtime_put(i2c->dev); - return -1; - } - - - for (i = 1; i < num; i++) { - /* Message address equal? */ - if (unlikely(intel_mid_i2c_address_neq(&pmsg[0], &pmsg[i]))) { - dev_err(&adap->dev, "Invalid address in msg[%d]\n", i); - mutex_unlock(&i2c->lock); - pm_runtime_put(i2c->dev); - return -EINVAL; - } - } - - if (intel_mid_i2c_setup(adap, pmsg)) { - mutex_unlock(&i2c->lock); - pm_runtime_put(i2c->dev); - return -EINVAL; - } - - for (i = 0; i < num; i++) { - i2c->msg = pmsg; - i2c->status = STATUS_IDLE; - /* Read or Write */ - if (pmsg->flags & I2C_M_RD) { - dev_dbg(&adap->dev, "I2C_M_RD\n"); - err = xfer_read(adap, pmsg->buf, pmsg->len); - } else { - dev_dbg(&adap->dev, "I2C_M_WR\n"); - err = xfer_write(adap, pmsg->buf, pmsg->len); - } - if (err < 0) - break; - dev_dbg(&adap->dev, "msg[%d] transfer complete\n", i); - pmsg++; /* next message */ - } - - /* Mask interrupts */ - writel(0x0000, i2c->base + IC_INTR_MASK); - /* Clear all interrupts */ - readl(i2c->base + IC_CLR_INTR); - - i2c->status = STATUS_IDLE; - mutex_unlock(&i2c->lock); - pm_runtime_put(i2c->dev); - - return err; -} - -static int intel_mid_i2c_runtime_suspend(struct device *dev) -{ - struct pci_dev *pdev = to_pci_dev(dev); - struct intel_mid_i2c_private *i2c = pci_get_drvdata(pdev); - struct i2c_adapter *adap = to_i2c_adapter(dev); - int err; - - if (i2c->status != STATUS_IDLE) - return -1; - - intel_mid_i2c_disable(adap); - - err = pci_save_state(pdev); - if (err) { - dev_err(dev, "pci_save_state failed\n"); - return err; - } - - err = pci_set_power_state(pdev, PCI_D3hot); - if (err) { - dev_err(dev, "pci_set_power_state failed\n"); - return err; - } - i2c->status = STATUS_STANDBY; - - return 0; -} - -static int intel_mid_i2c_runtime_resume(struct device *dev) -{ - struct pci_dev *pdev = to_pci_dev(dev); - struct intel_mid_i2c_private *i2c = pci_get_drvdata(pdev); - int err; - - if (i2c->status != STATUS_STANDBY) - return 0; - - pci_set_power_state(pdev, PCI_D0); - pci_restore_state(pdev); - err = pci_enable_device(pdev); - if (err) { - dev_err(dev, "pci_enable_device failed\n"); - return err; - } - - i2c->status = STATUS_IDLE; - - intel_mid_i2c_hwinit(i2c); - return err; -} - -static void i2c_isr_read(struct intel_mid_i2c_private *i2c) -{ - struct i2c_msg *msg = i2c->msg; - int rx_num; - u32 len; - u8 *buf; - - if (!(msg->flags & I2C_M_RD)) - return; - - if (i2c->status != STATUS_READ_IN_PROGRESS) { - len = msg->len; - buf = msg->buf; - } else { - len = i2c->rx_buf_len; - buf = i2c->rx_buf; - } - - rx_num = readl(i2c->base + IC_RXFLR); - - for (; len > 0 && rx_num > 0; len--, rx_num--) - *buf++ = readl(i2c->base + IC_DATA_CMD); - - if (len > 0) { - i2c->status = STATUS_READ_IN_PROGRESS; - i2c->rx_buf_len = len; - i2c->rx_buf = buf; - } else - i2c->status = STATUS_READ_SUCCESS; - - return; -} - -static irqreturn_t intel_mid_i2c_isr(int this_irq, void *dev) -{ - struct intel_mid_i2c_private *i2c = dev; - u32 stat = readl(i2c->base + IC_INTR_STAT); - - if (!stat) - return IRQ_NONE; - - dev_dbg(&i2c->adap.dev, "%s, stat = 0x%x\n", __func__, stat); - stat &= 0x54; - - if (i2c->status != STATUS_WRITE_START && - i2c->status != STATUS_READ_START && - i2c->status != STATUS_READ_IN_PROGRESS) - goto err; - - if (stat & TX_ABRT) - i2c->abort = readl(i2c->base + IC_TX_ABRT_SOURCE); - - readl(i2c->base + IC_CLR_INTR); - - if (stat & TX_ABRT) { - intel_mid_i2c_abort(i2c); - goto exit; - } - - if (stat & RX_FULL) { - i2c_isr_read(i2c); - goto exit; - } - - if (stat & TX_EMPTY) { - if (readl(i2c->base + IC_STATUS) & 0x4) - i2c->status = STATUS_WRITE_SUCCESS; - } - -exit: - if (i2c->status == STATUS_READ_SUCCESS || - i2c->status == STATUS_WRITE_SUCCESS || - i2c->status == STATUS_XFER_ABORT) { - /* Clear all interrupts */ - readl(i2c->base + IC_CLR_INTR); - /* Mask interrupts */ - writel(0, i2c->base + IC_INTR_MASK); - complete(&i2c->complete); - } -err: - return IRQ_HANDLED; -} - -static struct i2c_algorithm intel_mid_i2c_algorithm = { - .master_xfer = intel_mid_i2c_xfer, - .functionality = intel_mid_i2c_func, -}; - - -static const struct dev_pm_ops intel_mid_i2c_pm_ops = { - .runtime_suspend = intel_mid_i2c_runtime_suspend, - .runtime_resume = intel_mid_i2c_runtime_resume, -}; - -/** - * intel_mid_i2c_probe - I2C controller initialization routine - * @dev: pci device - * @id: device id - * - * Return Values: - * 0 success - * -ENODEV If cannot allocate pci resource - * -ENOMEM If the register base remapping failed, or - * if kzalloc failed - * - * Initialization steps: - * 1. Request for PCI resource - * 2. Remap the start address of PCI resource to register base - * 3. Request for device memory region - * 4. Fill in the struct members of intel_mid_i2c_private - * 5. Call intel_mid_i2c_hwinit() for hardware initialization - * 6. Register I2C adapter in i2c-core - */ -static int intel_mid_i2c_probe(struct pci_dev *dev, - const struct pci_device_id *id) -{ - struct intel_mid_i2c_private *mrst; - unsigned long start, len; - int err, busnum; - void __iomem *base = NULL; - - dev_dbg(&dev->dev, "Get into probe function for I2C\n"); - err = pci_enable_device(dev); - if (err) { - dev_err(&dev->dev, "Failed to enable I2C PCI device (%d)\n", - err); - goto exit; - } - - /* Determine the address of the I2C area */ - start = pci_resource_start(dev, 0); - len = pci_resource_len(dev, 0); - if (!start || len == 0) { - dev_err(&dev->dev, "base address not set\n"); - err = -ENODEV; - goto exit; - } - dev_dbg(&dev->dev, "%s i2c resource start 0x%lx, len=%ld\n", - PLATFORM, start, len); - - err = pci_request_region(dev, 0, DRIVER_NAME); - if (err) { - dev_err(&dev->dev, "failed to request I2C region " - "0x%lx-0x%lx\n", start, - (unsigned long)pci_resource_end(dev, 0)); - goto exit; - } - - base = ioremap_nocache(start, len); - if (!base) { - dev_err(&dev->dev, "I/O memory remapping failed\n"); - err = -ENOMEM; - goto fail0; - } - - /* Allocate the per-device data structure, intel_mid_i2c_private */ - mrst = kzalloc(sizeof(struct intel_mid_i2c_private), GFP_KERNEL); - if (mrst == NULL) { - dev_err(&dev->dev, "can't allocate interface\n"); - err = -ENOMEM; - goto fail1; - } - - /* Initialize struct members */ - snprintf(mrst->adap.name, sizeof(mrst->adap.name), - "Intel MID I2C at %lx", start); - mrst->adap.owner = THIS_MODULE; - mrst->adap.algo = &intel_mid_i2c_algorithm; - mrst->adap.dev.parent = &dev->dev; - mrst->dev = &dev->dev; - mrst->base = base; - mrst->speed = STANDARD; - mrst->abort = 0; - mrst->rx_buf_len = 0; - mrst->status = STATUS_IDLE; - - pci_set_drvdata(dev, mrst); - i2c_set_adapdata(&mrst->adap, mrst); - - mrst->adap.nr = busnum = id->driver_data; - if (dev->device <= 0x0804) - mrst->platform = MOORESTOWN; - else - mrst->platform = MEDFIELD; - - dev_dbg(&dev->dev, "I2C%d\n", busnum); - - if (ctl_num > busnum) { - if (speed_mode[busnum] < 0 || speed_mode[busnum] >= NUM_SPEEDS) - dev_warn(&dev->dev, "invalid speed %d ignored.\n", - speed_mode[busnum]); - else - mrst->speed = speed_mode[busnum]; - } - - /* Initialize i2c controller */ - err = intel_mid_i2c_hwinit(mrst); - if (err < 0) { - dev_err(&dev->dev, "I2C interface initialization failed\n"); - goto fail2; - } - - mutex_init(&mrst->lock); - init_completion(&mrst->complete); - - /* Clear all interrupts */ - readl(mrst->base + IC_CLR_INTR); - writel(0x0000, mrst->base + IC_INTR_MASK); - - err = request_irq(dev->irq, intel_mid_i2c_isr, IRQF_SHARED, - mrst->adap.name, mrst); - if (err) { - dev_err(&dev->dev, "Failed to request IRQ for I2C controller: " - "%s", mrst->adap.name); - goto fail2; - } - - /* Adapter registration */ - err = i2c_add_numbered_adapter(&mrst->adap); - if (err) { - dev_err(&dev->dev, "Adapter %s registration failed\n", - mrst->adap.name); - goto fail3; - } - - dev_dbg(&dev->dev, "%s I2C bus %d driver bind success.\n", - (mrst->platform == MOORESTOWN) ? "Moorestown" : "Medfield", - busnum); - - pm_runtime_enable(&dev->dev); - return 0; - -fail3: - free_irq(dev->irq, mrst); -fail2: - kfree(mrst); -fail1: - iounmap(base); -fail0: - pci_release_region(dev, 0); -exit: - return err; -} - -static void intel_mid_i2c_remove(struct pci_dev *dev) -{ - struct intel_mid_i2c_private *mrst = pci_get_drvdata(dev); - intel_mid_i2c_disable(&mrst->adap); - i2c_del_adapter(&mrst->adap); - - free_irq(dev->irq, mrst); - iounmap(mrst->base); - kfree(mrst); - pci_release_region(dev, 0); -} - -static DEFINE_PCI_DEVICE_TABLE(intel_mid_i2c_ids) = { - /* Moorestown */ - { PCI_VDEVICE(INTEL, 0x0802), 0 }, - { PCI_VDEVICE(INTEL, 0x0803), 1 }, - { PCI_VDEVICE(INTEL, 0x0804), 2 }, - /* Medfield */ - { PCI_VDEVICE(INTEL, 0x0817), 3,}, - { PCI_VDEVICE(INTEL, 0x0818), 4 }, - { PCI_VDEVICE(INTEL, 0x0819), 5 }, - { PCI_VDEVICE(INTEL, 0x082C), 0 }, - { PCI_VDEVICE(INTEL, 0x082D), 1 }, - { PCI_VDEVICE(INTEL, 0x082E), 2 }, - { 0,} -}; -MODULE_DEVICE_TABLE(pci, intel_mid_i2c_ids); - -static struct pci_driver intel_mid_i2c_driver = { - .name = DRIVER_NAME, - .id_table = intel_mid_i2c_ids, - .probe = intel_mid_i2c_probe, - .remove = intel_mid_i2c_remove, -}; - -module_pci_driver(intel_mid_i2c_driver); - -MODULE_AUTHOR("Ba Zheng <zheng.ba@intel.com>"); -MODULE_DESCRIPTION("I2C driver for Moorestown Platform"); -MODULE_LICENSE("GPL"); -MODULE_VERSION(VERSION); |