diff options
Diffstat (limited to 'target/linux/lantiq/patches-3.9/0004-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch')
| -rw-r--r-- | target/linux/lantiq/patches-3.9/0004-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch | 1047 |
1 files changed, 1047 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-3.9/0004-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch b/target/linux/lantiq/patches-3.9/0004-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch new file mode 100644 index 0000000000..25b2bce58d --- /dev/null +++ b/target/linux/lantiq/patches-3.9/0004-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch @@ -0,0 +1,1047 @@ +From 6a68cfb053a7c95ff36c7c2ce2a092aa98620422 Mon Sep 17 00:00:00 2001 +From: John Crispin <blogic@openwrt.org> +Date: Sun, 20 May 2012 00:42:39 +0200 +Subject: [PATCH 04/22] I2C: MIPS: lantiq: add FALC-ON i2c bus master + +This patch adds the driver needed to make the I2C bus work on FALC-ON SoCs. + +Signed-off-by: Thomas Langer <thomas.langer@lantiq.com> +Signed-off-by: John Crispin <blogic@openwrt.org> +--- + drivers/i2c/busses/Kconfig | 10 + + drivers/i2c/busses/Makefile | 1 + + drivers/i2c/busses/i2c-lantiq.c | 747 +++++++++++++++++++++++++++++++++++++++ + drivers/i2c/busses/i2c-lantiq.h | 234 ++++++++++++ + 4 files changed, 992 insertions(+) + create mode 100644 drivers/i2c/busses/i2c-lantiq.c + create mode 100644 drivers/i2c/busses/i2c-lantiq.h + +diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig +index adfee98..83d3147 100644 +--- a/drivers/i2c/busses/Kconfig ++++ b/drivers/i2c/busses/Kconfig +@@ -494,6 +494,16 @@ config I2C_IOP3XX + This driver can also be built as a module. If so, the module + will be called i2c-iop3xx. + ++config I2C_LANTIQ ++ tristate "Lantiq I2C interface" ++ depends on LANTIQ && SOC_FALCON ++ help ++ If you say yes to this option, support will be included for the ++ Lantiq I2C core. ++ ++ This driver can also be built as a module. If so, the module ++ will be called i2c-lantiq. ++ + config I2C_MPC + tristate "MPC107/824x/85xx/512x/52xx/83xx/86xx" + depends on PPC +diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile +index 8f4fc23..3273061 100644 +--- a/drivers/i2c/busses/Makefile ++++ b/drivers/i2c/busses/Makefile +@@ -48,6 +48,7 @@ obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o + obj-$(CONFIG_I2C_IMX) += i2c-imx.o + obj-$(CONFIG_I2C_INTEL_MID) += i2c-intel-mid.o + obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o ++obj-$(CONFIG_I2C_LANTIQ) += i2c-lantiq.o + obj-$(CONFIG_I2C_MPC) += i2c-mpc.o + obj-$(CONFIG_I2C_MV64XXX) += i2c-mv64xxx.o + obj-$(CONFIG_I2C_MXS) += i2c-mxs.o +diff --git a/drivers/i2c/busses/i2c-lantiq.c b/drivers/i2c/busses/i2c-lantiq.c +new file mode 100644 +index 0000000..9a5f58b +--- /dev/null ++++ b/drivers/i2c/busses/i2c-lantiq.c +@@ -0,0 +1,747 @@ ++ ++/* ++ * Lantiq I2C bus adapter ++ * ++ * Parts based on i2c-designware.c and other i2c drivers from Linux 2.6.33 ++ * ++ * 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; either version 2 of the License, or ++ * (at your option) any later version. ++ * ++ * 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., 675 Mass Ave, Cambridge, MA 02139, USA. ++ * ++ * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com> ++ */ ++ ++#include <linux/kernel.h> ++#include <linux/module.h> ++#include <linux/delay.h> ++#include <linux/slab.h> /* for kzalloc, kfree */ ++#include <linux/i2c.h> ++#include <linux/errno.h> ++#include <linux/completion.h> ++#include <linux/interrupt.h> ++#include <linux/platform_device.h> ++#include <linux/io.h> ++#include <linux/of_irq.h> ++#include <linux/of_i2c.h> ++ ++#include <lantiq_soc.h> ++#include "i2c-lantiq.h" ++ ++/* ++ * CURRENT ISSUES: ++ * - no high speed support ++ * - ten bit mode is not tested (no slave devices) ++ */ ++ ++/* access macros */ ++#define i2c_r32(reg) \ ++ __raw_readl(&(priv->membase)->reg) ++#define i2c_w32(val, reg) \ ++ __raw_writel(val, &(priv->membase)->reg) ++#define i2c_w32_mask(clear, set, reg) \ ++ i2c_w32((i2c_r32(reg) & ~(clear)) | (set), reg) ++ ++#define DRV_NAME "i2c-lantiq" ++#define DRV_VERSION "1.00" ++ ++#define LTQ_I2C_BUSY_TIMEOUT 20 /* ms */ ++ ++#ifdef DEBUG ++#define LTQ_I2C_XFER_TIMEOUT (25*HZ) ++#else ++#define LTQ_I2C_XFER_TIMEOUT HZ ++#endif ++ ++#define LTQ_I2C_IMSC_DEFAULT_MASK (I2C_IMSC_I2C_P_INT_EN | \ ++ I2C_IMSC_I2C_ERR_INT_EN) ++ ++#define LTQ_I2C_ARB_LOST (1 << 0) ++#define LTQ_I2C_NACK (1 << 1) ++#define LTQ_I2C_RX_UFL (1 << 2) ++#define LTQ_I2C_RX_OFL (1 << 3) ++#define LTQ_I2C_TX_UFL (1 << 4) ++#define LTQ_I2C_TX_OFL (1 << 5) ++ ++struct ltq_i2c { ++ struct mutex mutex; ++ ++ ++ /* active clock settings */ ++ unsigned int input_clock; /* clock input for i2c hardware block */ ++ unsigned int i2c_clock; /* approximated bus clock in kHz */ ++ ++ struct clk *clk_gate; ++ struct clk *clk_input; ++ ++ ++ /* resources (memory and interrupts) */ ++ int irq_lb; /* last burst irq */ ++ ++ struct lantiq_reg_i2c __iomem *membase; /* base of mapped registers */ ++ ++ struct i2c_adapter adap; ++ struct device *dev; ++ ++ struct completion cmd_complete; ++ ++ ++ /* message transfer data */ ++ struct i2c_msg *current_msg; /* current message */ ++ int msgs_num; /* number of messages to handle */ ++ u8 *msg_buf; /* current buffer */ ++ u32 msg_buf_len; /* remaining length of current buffer */ ++ int msg_err; /* error status of the current transfer */ ++ ++ ++ /* master status codes */ ++ enum { ++ STATUS_IDLE, ++ STATUS_ADDR, /* address phase */ ++ STATUS_WRITE, ++ STATUS_READ, ++ STATUS_READ_END, ++ STATUS_STOP ++ } status; ++}; ++ ++static irqreturn_t ltq_i2c_isr(int irq, void *dev_id); ++ ++static inline void enable_burst_irq(struct ltq_i2c *priv) ++{ ++ i2c_w32_mask(0, I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, imsc); ++} ++static inline void disable_burst_irq(struct ltq_i2c *priv) ++{ ++ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, 0, imsc); ++} ++ ++static void prepare_msg_send_addr(struct ltq_i2c *priv) ++{ ++ struct i2c_msg *msg = priv->current_msg; ++ int rd = !!(msg->flags & I2C_M_RD); /* extends to 0 or 1 */ ++ u16 addr = msg->addr; ++ ++ /* new i2c_msg */ ++ priv->msg_buf = msg->buf; ++ priv->msg_buf_len = msg->len; ++ if (rd) ++ priv->status = STATUS_READ; ++ else ++ priv->status = STATUS_WRITE; ++ ++ /* send slave address */ ++ if (msg->flags & I2C_M_TEN) { ++ i2c_w32(0xf0 | ((addr & 0x300) >> 7) | rd, txd); ++ i2c_w32(addr & 0xff, txd); ++ } else { ++ i2c_w32((addr & 0x7f) << 1 | rd, txd); ++ } ++} ++ ++static void ltq_i2c_set_tx_len(struct ltq_i2c *priv) ++{ ++ struct i2c_msg *msg = priv->current_msg; ++ int len = (msg->flags & I2C_M_TEN) ? 2 : 1; ++ ++ pr_debug("set_tx_len %cX\n", (msg->flags & I2C_M_RD) ? 'R' : 'T'); ++ ++ priv->status = STATUS_ADDR; ++ ++ if (!(msg->flags & I2C_M_RD)) ++ len += msg->len; ++ else ++ /* set maximum received packet size (before rx int!) */ ++ i2c_w32(msg->len, mrps_ctrl); ++ i2c_w32(len, tps_ctrl); ++ enable_burst_irq(priv); ++} ++ ++static int ltq_i2c_hw_set_clock(struct i2c_adapter *adap) ++{ ++ struct ltq_i2c *priv = i2c_get_adapdata(adap); ++ unsigned int input_clock = clk_get_rate(priv->clk_input); ++ u32 dec, inc = 1; ++ ++ /* clock changed? */ ++ if (priv->input_clock == input_clock) ++ return 0; ++ ++ /* ++ * this formula is only an approximation, found by the recommended ++ * values in the "I2C Architecture Specification 1.7.1" ++ */ ++ dec = input_clock / (priv->i2c_clock * 2); ++ if (dec <= 6) ++ return -ENXIO; ++ ++ i2c_w32(0, fdiv_high_cfg); ++ i2c_w32((inc << I2C_FDIV_CFG_INC_OFFSET) | ++ (dec << I2C_FDIV_CFG_DEC_OFFSET), ++ fdiv_cfg); ++ ++ dev_info(priv->dev, "setup clocks (in %d kHz, bus %d kHz, dec=%d)\n", ++ input_clock, priv->i2c_clock, dec); ++ ++ priv->input_clock = input_clock; ++ return 0; ++} ++ ++static int ltq_i2c_hw_init(struct i2c_adapter *adap) ++{ ++ int ret = 0; ++ struct ltq_i2c *priv = i2c_get_adapdata(adap); ++ ++ /* disable bus */ ++ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl); ++ ++#ifndef DEBUG ++ /* set normal operation clock divider */ ++ i2c_w32(1 << I2C_CLC_RMC_OFFSET, clc); ++#else ++ /* for debugging a higher divider value! */ ++ i2c_w32(0xF0 << I2C_CLC_RMC_OFFSET, clc); ++#endif ++ ++ /* setup clock */ ++ ret = ltq_i2c_hw_set_clock(adap); ++ if (ret != 0) { ++ dev_warn(priv->dev, "invalid clock settings\n"); ++ return ret; ++ } ++ ++ /* configure fifo */ ++ i2c_w32(I2C_FIFO_CFG_TXFC | /* tx fifo as flow controller */ ++ I2C_FIFO_CFG_RXFC | /* rx fifo as flow controller */ ++ I2C_FIFO_CFG_TXFA_TXFA2 | /* tx fifo 4-byte aligned */ ++ I2C_FIFO_CFG_RXFA_RXFA2 | /* rx fifo 4-byte aligned */ ++ I2C_FIFO_CFG_TXBS_TXBS0 | /* tx fifo burst size is 1 word */ ++ I2C_FIFO_CFG_RXBS_RXBS0, /* rx fifo burst size is 1 word */ ++ fifo_cfg); ++ ++ /* configure address */ ++ i2c_w32(I2C_ADDR_CFG_SOPE_EN | /* generate stop when no more data in ++ the fifo */ ++ I2C_ADDR_CFG_SONA_EN | /* generate stop when NA received */ ++ I2C_ADDR_CFG_MnS_EN | /* we are master device */ ++ 0, /* our slave address (not used!) */ ++ addr_cfg); ++ ++ /* enable bus */ ++ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl); ++ ++ return 0; ++} ++ ++static int ltq_i2c_wait_bus_not_busy(struct ltq_i2c *priv) ++{ ++ unsigned long timeout; ++ ++ timeout = jiffies + msecs_to_jiffies(LTQ_I2C_BUSY_TIMEOUT); ++ ++ do { ++ u32 stat = i2c_r32(bus_stat); ++ ++ if ((stat & I2C_BUS_STAT_BS_MASK) == I2C_BUS_STAT_BS_FREE) ++ return 0; ++ ++ cond_resched(); ++ } while (!time_after_eq(jiffies, timeout)); ++ ++ dev_err(priv->dev, "timeout waiting for bus ready\n"); ++ return -ETIMEDOUT; ++} ++ ++static void ltq_i2c_tx(struct ltq_i2c *priv, int last) ++{ ++ if (priv->msg_buf_len && priv->msg_buf) { ++ i2c_w32(*priv->msg_buf, txd); ++ ++ if (--priv->msg_buf_len) ++ priv->msg_buf++; ++ else ++ priv->msg_buf = NULL; ++ } else { ++ last = 1; ++ } ++ ++ if (last) ++ disable_burst_irq(priv); ++} ++ ++static void ltq_i2c_rx(struct ltq_i2c *priv, int last) ++{ ++ u32 fifo_stat, timeout; ++ if (priv->msg_buf_len && priv->msg_buf) { ++ timeout = 5000000; ++ do { ++ fifo_stat = i2c_r32(ffs_stat); ++ } while (!fifo_stat && --timeout); ++ if (!timeout) { ++ last = 1; ++ pr_debug("\nrx timeout\n"); ++ goto err; ++ } ++ while (fifo_stat) { ++ *priv->msg_buf = i2c_r32(rxd); ++ if (--priv->msg_buf_len) { ++ priv->msg_buf++; ++ } else { ++ priv->msg_buf = NULL; ++ last = 1; ++ break; ++ } ++ /* ++ * do not read more than burst size, otherwise no "last ++ * burst" is generated and the transaction is blocked! ++ */ ++ fifo_stat = 0; ++ } ++ } else { ++ last = 1; ++ } ++err: ++ if (last) { ++ disable_burst_irq(priv); ++ ++ if (priv->status == STATUS_READ_END) { ++ /* ++ * do the STATUS_STOP and complete() here, as sometimes ++ * the tx_end is already seen before this is finished ++ */ ++ priv->status = STATUS_STOP; ++ complete(&priv->cmd_complete); ++ } else { ++ i2c_w32(I2C_ENDD_CTRL_SETEND, endd_ctrl); ++ priv->status = STATUS_READ_END; ++ } ++ } ++} ++ ++static void ltq_i2c_xfer_init(struct ltq_i2c *priv) ++{ ++ /* enable interrupts */ ++ i2c_w32(LTQ_I2C_IMSC_DEFAULT_MASK, imsc); ++ ++ /* trigger transfer of first msg */ ++ ltq_i2c_set_tx_len(priv); ++} ++ ++static void dump_msgs(struct i2c_msg msgs[], int num, int rx) ++{ ++#if defined(DEBUG) ++ int i, j; ++ pr_debug("Messages %d %s\n", num, rx ? "out" : "in"); ++ for (i = 0; i < num; i++) { ++ pr_debug("%2d %cX Msg(%d) addr=0x%X: ", i, ++ (msgs[i].flags & I2C_M_RD) ? 'R' : 'T', ++ msgs[i].len, msgs[i].addr); ++ if (!(msgs[i].flags & I2C_M_RD) || rx) { ++ for (j = 0; j < msgs[i].len; j++) ++ pr_debug("%02X ", msgs[i].buf[j]); ++ } ++ pr_debug("\n"); ++ } ++#endif ++} ++ ++static void ltq_i2c_release_bus(struct ltq_i2c *priv) ++{ ++ if ((i2c_r32(bus_stat) & I2C_BUS_STAT_BS_MASK) == I2C_BUS_STAT_BS_BM) ++ i2c_w32(I2C_ENDD_CTRL_SETEND, endd_ctrl); ++} ++ ++static int ltq_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], ++ int num) ++{ ++ struct ltq_i2c *priv = i2c_get_adapdata(adap); ++ int ret; ++ ++ dev_dbg(priv->dev, "xfer %u messages\n", num); ++ dump_msgs(msgs, num, 0); ++ ++ mutex_lock(&priv->mutex); ++ ++ INIT_COMPLETION(priv->cmd_complete); ++ priv->current_msg = msgs; ++ priv->msgs_num = num; ++ priv->msg_err = 0; ++ priv->status = STATUS_IDLE; ++ ++ /* wait for the bus to become ready */ ++ ret = ltq_i2c_wait_bus_not_busy(priv); ++ if (ret) ++ goto done; ++ ++ while (priv->msgs_num) { ++ /* start the transfers */ ++ ltq_i2c_xfer_init(priv); ++ ++ /* wait for transfers to complete */ ++ ret = wait_for_completion_interruptible_timeout( ++ &priv->cmd_complete, LTQ_I2C_XFER_TIMEOUT); ++ if (ret == 0) { ++ dev_err(priv->dev, "controller timed out\n"); ++ ltq_i2c_hw_init(adap); ++ ret = -ETIMEDOUT; ++ goto done; ++ } else if (ret < 0) ++ goto done; ++ ++ if (priv->msg_err) { ++ if (priv->msg_err & LTQ_I2C_NACK) ++ ret = -ENXIO; ++ else ++ ret = -EREMOTEIO; ++ goto done; ++ } ++ if (--priv->msgs_num) ++ priv->current_msg++; ++ } ++ /* no error? */ ++ ret = num; ++ ++done: ++ ltq_i2c_release_bus(priv); ++ ++ mutex_unlock(&priv->mutex); ++ ++ if (ret >= 0) ++ dump_msgs(msgs, num, 1); ++ ++ pr_debug("XFER ret %d\n", ret); ++ return ret; ++} ++ ++static irqreturn_t ltq_i2c_isr_burst(int irq, void *dev_id) ++{ ++ struct ltq_i2c *priv = dev_id; ++ struct i2c_msg *msg = priv->current_msg; ++ int last = (irq == priv->irq_lb); ++ ++ if (last) ++ pr_debug("LB "); ++ else ++ pr_debug("B "); ++ ++ if (msg->flags & I2C_M_RD) { ++ switch (priv->status) { ++ case STATUS_ADDR: ++ pr_debug("X"); ++ prepare_msg_send_addr(priv); ++ disable_burst_irq(priv); ++ break; ++ case STATUS_READ: ++ case STATUS_READ_END: ++ pr_debug("R"); ++ ltq_i2c_rx(priv, last); ++ break; ++ default: ++ disable_burst_irq(priv); ++ pr_warn("Status R %d\n", priv->status); ++ break; ++ } ++ } else { ++ switch (priv->status) { ++ case STATUS_ADDR: ++ pr_debug("x"); ++ prepare_msg_send_addr(priv); ++ break; ++ case STATUS_WRITE: ++ pr_debug("w"); ++ ltq_i2c_tx(priv, last); ++ break; ++ default: ++ disable_burst_irq(priv); ++ pr_warn("Status W %d\n", priv->status); ++ break; ++ } ++ } ++ ++ i2c_w32(I2C_ICR_BREQ_INT_CLR | I2C_ICR_LBREQ_INT_CLR, icr); ++ return IRQ_HANDLED; ++} ++ ++static void ltq_i2c_isr_prot(struct ltq_i2c *priv) ++{ ++ u32 i_pro = i2c_r32(p_irqss); ++ ++ pr_debug("i2c-p"); ++ ++ /* not acknowledge */ ++ if (i_pro & I2C_P_IRQSS_NACK) { ++ priv->msg_err |= LTQ_I2C_NACK; ++ pr_debug(" nack"); ++ } ++ ++ /* arbitration lost */ ++ if (i_pro & I2C_P_IRQSS_AL) { ++ priv->msg_err |= LTQ_I2C_ARB_LOST; ++ pr_debug(" arb-lost"); ++ } ++ /* tx -> rx switch */ ++ if (i_pro & I2C_P_IRQSS_RX) ++ pr_debug(" rx"); ++ ++ /* tx end */ ++ if (i_pro & I2C_P_IRQSS_TX_END) ++ pr_debug(" txend"); ++ pr_debug("\n"); ++ ++ if (!priv->msg_err) { ++ /* tx -> rx switch */ ++ if (i_pro & I2C_P_IRQSS_RX) { ++ priv->status = STATUS_READ; ++ enable_burst_irq(priv); ++ } ++ if (i_pro & I2C_P_IRQSS_TX_END) { ++ if (priv->status == STATUS_READ) ++ priv->status = STATUS_READ_END; ++ else { ++ disable_burst_irq(priv); ++ priv->status = STATUS_STOP; ++ } ++ } ++ } ++ ++ i2c_w32(i_pro, p_irqsc); ++} ++ ++static irqreturn_t ltq_i2c_isr(int irq, void *dev_id) ++{ ++ u32 i_raw, i_err = 0; ++ struct ltq_i2c *priv = dev_id; ++ ++ i_raw = i2c_r32(mis); ++ pr_debug("i_raw 0x%08X\n", i_raw); ++ ++ /* error interrupt */ ++ if (i_raw & I2C_RIS_I2C_ERR_INT_INTOCC) { ++ i_err = i2c_r32(err_irqss); ++ pr_debug("i_err 0x%08X bus_stat 0x%04X\n", ++ i_err, i2c_r32(bus_stat)); ++ ++ /* tx fifo overflow (8) */ ++ if (i_err & I2C_ERR_IRQSS_TXF_OFL) ++ priv->msg_err |= LTQ_I2C_TX_OFL; ++ ++ /* tx fifo underflow (4) */ ++ if (i_err & I2C_ERR_IRQSS_TXF_UFL) ++ priv->msg_err |= LTQ_I2C_TX_UFL; ++ ++ /* rx fifo overflow (2) */ ++ if (i_err & I2C_ERR_IRQSS_RXF_OFL) ++ priv->msg_err |= LTQ_I2C_RX_OFL; ++ ++ /* rx fifo underflow (1) */ ++ if (i_err & I2C_ERR_IRQSS_RXF_UFL) ++ priv->msg_err |= LTQ_I2C_RX_UFL; ++ ++ i2c_w32(i_err, err_irqsc); ++ } ++ ++ /* protocol interrupt */ ++ if (i_raw & I2C_RIS_I2C_P_INT_INTOCC) ++ ltq_i2c_isr_prot(priv); ++ ++ if ((priv->msg_err) || (priv->status == STATUS_STOP)) ++ complete(&priv->cmd_complete); ++ ++ return IRQ_HANDLED; ++} ++ ++static u32 ltq_i2c_functionality(struct i2c_adapter *adap) ++{ ++ return I2C_FUNC_I2C | ++ I2C_FUNC_10BIT_ADDR | ++ I2C_FUNC_SMBUS_EMUL; ++} ++ ++static struct i2c_algorithm ltq_i2c_algorithm = { ++ .master_xfer = ltq_i2c_xfer, ++ .functionality = ltq_i2c_functionality, ++}; ++ ++static int __devinit ltq_i2c_probe(struct platform_device *pdev) ++{ ++ struct device_node *node = pdev->dev.of_node; ++ struct ltq_i2c *priv; ++ struct i2c_adapter *adap; ++ struct resource *mmres, irqres[4]; ++ int ret = 0; ++ ++ dev_dbg(&pdev->dev, "probing\n"); ++ ++ mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ ret = of_irq_to_resource_table(node, irqres, 4); ++ if (!mmres || (ret != 4)) { ++ dev_err(&pdev->dev, "no resources\n"); ++ return -ENODEV; ++ } ++ ++ /* allocate private data */ ++ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); ++ if (!priv) { ++ dev_err(&pdev->dev, "can't allocate private data\n"); ++ return -ENOMEM; ++ } ++ ++ adap = &priv->adap; ++ i2c_set_adapdata(adap, priv); ++ adap->owner = THIS_MODULE; ++ adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; ++ strlcpy(adap->name, DRV_NAME "-adapter", sizeof(adap->name)); ++ adap->algo = <q_i2c_algorithm; ++ ++ if (of_property_read_u32(node, "clock-frequency", &priv->i2c_clock)) { ++ dev_warn(&pdev->dev, "No I2C speed selected, using 100kHz\n"); ++ priv->i2c_clock = 100000; ++ } ++ ++ init_completion(&priv->cmd_complete); ++ mutex_init(&priv->mutex); ++ ++ priv->membase = devm_request_and_ioremap(&pdev->dev, mmres); ++ if (priv->membase == NULL) ++ return -ENOMEM; ++ ++ priv->dev = &pdev->dev; ++ priv->irq_lb = irqres[0].start; ++ ++ ret = devm_request_irq(&pdev->dev, irqres[0].start, ltq_i2c_isr_burst, ++ IRQF_DISABLED, "i2c lb", priv); ++ if (ret) { ++ dev_err(&pdev->dev, "can't get last burst IRQ %d\n", ++ irqres[0].start); ++ return -ENODEV; ++ } ++ ++ ret = devm_request_irq(&pdev->dev, irqres[1].start, ltq_i2c_isr_burst, ++ IRQF_DISABLED, "i2c b", priv); ++ if (ret) { ++ dev_err(&pdev->dev, "can't get burst IRQ %d\n", ++ irqres[1].start); ++ return -ENODEV; ++ } ++ ++ ret = devm_request_irq(&pdev->dev, irqres[2].start, ltq_i2c_isr, ++ IRQF_DISABLED, "i2c err", priv); ++ if (ret) { ++ dev_err(&pdev->dev, "can't get error IRQ %d\n", ++ irqres[2].start); ++ return -ENODEV; ++ } ++ ++ ret = devm_request_irq(&pdev->dev, irqres[3].start, ltq_i2c_isr, ++ IRQF_DISABLED, "i2c p", priv); ++ if (ret) { ++ dev_err(&pdev->dev, "can't get protocol IRQ %d\n", ++ irqres[3].start); ++ return -ENODEV; ++ } ++ ++ dev_dbg(&pdev->dev, "mapped io-space to %p\n", priv->membase); ++ dev_dbg(&pdev->dev, "use IRQs %d, %d, %d, %d\n", irqres[0].start, ++ irqres[1].start, irqres[2].start, irqres[3].start); ++ ++ priv->clk_gate = devm_clk_get(&pdev->dev, NULL); ++ if (IS_ERR(priv->clk_gate)) { ++ dev_err(&pdev->dev, "failed to get i2c clk\n"); ++ return -ENOENT; ++ } ++ ++ /* this is a static clock, which has no refcounting */ ++ priv->clk_input = clk_get_fpi(); ++ if (IS_ERR(priv->clk_input)) { ++ dev_err(&pdev->dev, "failed to get fpi clk\n"); ++ return -ENOENT; ++ } ++ ++ clk_activate(priv->clk_gate); ++ ++ /* add our adapter to the i2c stack */ ++ ret = i2c_add_numbered_adapter(adap); ++ if (ret) { ++ dev_err(&pdev->dev, "can't register I2C adapter\n"); ++ goto out; ++ } ++ ++ platform_set_drvdata(pdev, priv); ++ i2c_set_adapdata(adap, priv); ++ ++ /* print module version information */ ++ dev_dbg(&pdev->dev, "module id=%u revision=%u\n", ++ (i2c_r32(id) & I2C_ID_ID_MASK) >> I2C_ID_ID_OFFSET, ++ (i2c_r32(id) & I2C_ID_REV_MASK) >> I2C_ID_REV_OFFSET); ++ ++ /* initialize HW */ ++ ret = ltq_i2c_hw_init(adap); ++ if (ret) { ++ dev_err(&pdev->dev, "can't configure adapter\n"); ++ i2c_del_adapter(adap); ++ platform_set_drvdata(pdev, NULL); ++ } else { ++ dev_info(&pdev->dev, "version %s\n", DRV_VERSION); ++ } ++ ++ of_i2c_register_devices(adap); ++ ++out: ++ /* if init failed, we need to deactivate the clock gate */ ++ if (ret) ++ clk_deactivate(priv->clk_gate); ++ ++ return ret; ++} ++ ++static int __devexit ltq_i2c_remove(struct platform_device *pdev) ++{ ++ struct ltq_i2c *priv = platform_get_drvdata(pdev); ++ ++ /* disable bus */ ++ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl); ++ ++ /* power down the core */ ++ clk_deactivate(priv->clk_gate); ++ ++ /* remove driver */ ++ i2c_del_adapter(&priv->adap); ++ kfree(priv); ++ ++ dev_dbg(&pdev->dev, "removed\n"); ++ platform_set_drvdata(pdev, NULL); ++ ++ return 0; ++} ++static const struct of_device_id ltq_i2c_match[] = { ++ { .compatible = "lantiq,lantiq-i2c" }, ++ {}, ++}; ++MODULE_DEVICE_TABLE(of, ltq_i2c_match); ++ ++static struct platform_driver ltq_i2c_driver = { ++ .probe = ltq_i2c_probe, ++ .remove = __devexit_p(ltq_i2c_remove), ++ .driver = { ++ .name = DRV_NAME, ++ .owner = THIS_MODULE, ++ .of_match_table = ltq_i2c_match, ++ }, ++}; ++ ++module_platform_driver(ltq_i2c_driver); ++ ++MODULE_DESCRIPTION("Lantiq I2C bus adapter"); ++MODULE_AUTHOR("Thomas Langer <thomas.langer@lantiq.com>"); ++MODULE_ALIAS("platform:" DRV_NAME); ++MODULE_LICENSE("GPL"); ++MODULE_VERSION(DRV_VERSION); +diff --git a/drivers/i2c/busses/i2c-lantiq.h b/drivers/i2c/busses/i2c-lantiq.h +new file mode 100644 +index 0000000..7a86b89 +--- /dev/null ++++ b/drivers/i2c/busses/i2c-lantiq.h +@@ -0,0 +1,234 @@ ++#ifndef I2C_LANTIQ_H ++#define I2C_LANTIQ_H ++ ++/* I2C register structure */ ++struct lantiq_reg_i2c { ++ /* I2C Kernel Clock Control Register */ ++ unsigned int clc; /* 0x00000000 */ ++ /* Reserved */ ++ unsigned int res_0; /* 0x00000004 */ ++ /* I2C Identification Register */ ++ unsigned int id; /* 0x00000008 */ ++ /* Reserved */ ++ unsigned int res_1; /* 0x0000000C */ ++ /* ++ * I2C RUN Control Register ++ * This register enables and disables the I2C peripheral. Before ++ * enabling, the I2C has to be configured properly. After enabling ++ * no configuration is possible ++ */ ++ unsigned int run_ctrl; /* 0x00000010 */ ++ /* ++ * I2C End Data Control Register ++ * This register is used to either turn around the data transmission ++ * direction or to address another slave without sending a stop ++ * condition. Also the software can stop the slave-transmitter by ++ * sending a not-accolade when working as master-receiver or even ++ * stop data transmission immediately when operating as ++ * master-transmitter. The writing to the bits of this control ++ * register is only effective when in MASTER RECEIVES BYTES, MASTER ++ * TRANSMITS BYTES, MASTER RESTART or SLAVE RECEIVE BYTES state ++ */ ++ unsigned int endd_ctrl; /* 0x00000014 */ ++ /* ++ * I2C Fractional Divider Configuration Register ++ * These register is used to program the fractional divider of the I2C ++ * bus. Before the peripheral is switched on by setting the RUN-bit the ++ * two (fixed) values for the two operating frequencies are programmed ++ * into these (configuration) registers. The Register FDIV_HIGH_CFG has ++ * the same layout as I2C_FDIV_CFG. ++ */ ++ unsigned int fdiv_cfg; /* 0x00000018 */ ++ /* ++ * I2C Fractional Divider (highspeed mode) Configuration Register ++ * These register is used to program the fractional divider of the I2C ++ * bus. Before the peripheral is switched on by setting the RUN-bit the ++ * two (fixed) values for the two operating frequencies are programmed ++ * into these (configuration) registers. The Register FDIV_CFG has the ++ * same layout as I2C_FDIV_CFG. ++ */ ++ unsigned int fdiv_high_cfg; /* 0x0000001C */ ++ /* I2C Address Configuration Register */ ++ unsigned int addr_cfg; /* 0x00000020 */ ++ /* I2C Bus Status Register ++ * This register gives a status information of the I2C. This additional ++ * information can be used by the software to start proper actions. ++ */ ++ unsigned int bus_stat; /* 0x00000024 */ ++ /* I2C FIFO Configuration Register */ ++ unsigned int fifo_cfg; /* 0x00000028 */ ++ /* I2C Maximum Received Packet Size Register */ ++ unsigned int mrps_ctrl; /* 0x0000002C */ ++ /* I2C Received Packet Size Status Register */ ++ unsigned int rps_stat; /* 0x00000030 */ ++ /* I2C Transmit Packet Size Register */ ++ unsigned int tps_ctrl; /* 0x00000034 */ ++ /* I2C Filled FIFO Stages Status Register */ ++ unsigned int ffs_stat; /* 0x00000038 */ ++ /* Reserved */ ++ unsigned int res_2; /* 0x0000003C */ ++ /* I2C Timing Configuration Register */ ++ unsigned int tim_cfg; /* 0x00000040 */ ++ /* Reserved */ ++ unsigned int res_3[7]; /* 0x00000044 */ ++ /* I2C Error Interrupt Request Source Mask Register */ ++ unsigned int err_irqsm; /* 0x00000060 */ ++ /* I2C Error Interrupt Request Source Status Register */ ++ unsigned int err_irqss; /* 0x00000064 */ ++ /* I2C Error Interrupt Request Source Clear Register */ ++ unsigned int err_irqsc; /* 0x00000068 */ ++ /* Reserved */ ++ unsigned int res_4; /* 0x0000006C */ ++ /* I2C Protocol Interrupt Request Source Mask Register */ ++ unsigned int p_irqsm; /* 0x00000070 */ ++ /* I2C Protocol Interrupt Request Source Status Register */ ++ unsigned int p_irqss; /* 0x00000074 */ ++ /* I2C Protocol Interrupt Request Source Clear Register */ ++ unsigned int p_irqsc; /* 0x00000078 */ ++ /* Reserved */ ++ unsigned int res_5; /* 0x0000007C */ ++ /* I2C Raw Interrupt Status Register */ ++ unsigned int ris; /* 0x00000080 */ ++ /* I2C Interrupt Mask Control Register */ ++ unsigned int imsc; /* 0x00000084 */ ++ /* I2C Masked Interrupt Status Register */ ++ unsigned int mis; /* 0x00000088 */ ++ /* I2C Interrupt Clear Register */ ++ unsigned int icr; /* 0x0000008C */ ++ /* I2C Interrupt Set Register */ ++ unsigned int isr; /* 0x00000090 */ ++ /* I2C DMA Enable Register */ ++ unsigned int dmae; /* 0x00000094 */ ++ /* Reserved */ ++ unsigned int res_6[8154]; /* 0x00000098 */ ++ /* I2C Transmit Data Register */ ++ unsigned int txd; /* 0x00008000 */ ++ /* Reserved */ ++ unsigned int res_7[4095]; /* 0x00008004 */ ++ /* I2C Receive Data Register */ ++ unsigned int rxd; /* 0x0000C000 */ ++ /* Reserved */ ++ unsigned int res_8[4095]; /* 0x0000C004 */ ++}; ++ ++/* ++ * Clock Divider for Normal Run Mode ++ * Max 8-bit divider value. IF RMC is 0 the module is disabled. Note: As long ++ * as the new divider value RMC is not valid, the register returns 0x0000 00xx ++ * on reading. ++ */ ++#define I2C_CLC_RMC_MASK 0x0000FF00 ++/* field offset */ ++#define I2C_CLC_RMC_OFFSET 8 ++ ++/* Fields of "I2C Identification Register" */ ++/* Module ID */ ++#define I2C_ID_ID_MASK 0x0000FF00 ++/* field offset */ ++#define I2C_ID_ID_OFFSET 8 ++/* Revision */ ++#define I2C_ID_REV_MASK 0x000000FF ++/* field offset */ ++#define I2C_ID_REV_OFFSET 0 ++ ++/* Fields of "I2C Interrupt Mask Control Register" */ ++/* Enable */ ++#define I2C_IMSC_BREQ_INT_EN 0x00000008 ++/* Enable */ ++#define I2C_IMSC_LBREQ_INT_EN 0x00000004 ++ ++/* Fields of "I2C Fractional Divider Configuration Register" */ ++/* field offset */ ++#define I2C_FDIV_CFG_INC_OFFSET 16 ++ ++/* Fields of "I2C Interrupt Mask Control Register" */ ++/* Enable */ ++#define I2C_IMSC_I2C_P_INT_EN 0x00000020 ++/* Enable */ ++#define I2C_IMSC_I2C_ERR_INT_EN 0x00000010 ++ ++/* Fields of "I2C Error Interrupt Request Source Status Register" */ ++/* TXF_OFL */ ++#define I2C_ERR_IRQSS_TXF_OFL 0x00000008 ++/* TXF_UFL */ ++#define I2C_ERR_IRQSS_TXF_UFL 0x00000004 ++/* RXF_OFL */ ++#define I2C_ERR_IRQSS_RXF_OFL 0x00000002 ++/* RXF_UFL */ ++#define I2C_ERR_IRQSS_RXF_UFL 0x00000001 ++ ++/* Fields of "I2C Raw Interrupt Status Register" */ ++/* Read: Interrupt occurred. */ ++#define I2C_RIS_I2C_ERR_INT_INTOCC 0x00000010 ++/* Read: Interrupt occurred. */ ++#define I2C_RIS_I2C_P_INT_INTOCC 0x00000020 ++ ++/* Fields of "I2C FIFO Configuration Register" */ ++/* TX FIFO Flow Control */ ++#define I2C_FIFO_CFG_TXFC 0x00020000 ++/* RX FIFO Flow Control */ ++#define I2C_FIFO_CFG_RXFC 0x00010000 ++/* Word aligned (character alignment of four characters) */ ++#define I2C_FIFO_CFG_TXFA_TXFA2 0x00002000 ++/* Word aligned (character alignment of four characters) */ ++#define I2C_FIFO_CFG_RXFA_RXFA2 0x00000200 ++/* 1 word */ ++#define I2C_FIFO_CFG_TXBS_TXBS0 0x00000000 ++ ++/* Fields of "I2C FIFO Configuration Register" */ ++/* 1 word */ ++#define I2C_FIFO_CFG_RXBS_RXBS0 0x00000000 ++/* Stop on Packet End Enable */ ++#define I2C_ADDR_CFG_SOPE_EN 0x00200000 ++/* Stop on Not Acknowledge Enable */ ++#define I2C_ADDR_CFG_SONA_EN 0x00100000 ++/* Enable */ ++#define I2C_ADDR_CFG_MnS_EN 0x00080000 ++ ++/* Fields of "I2C Interrupt Clear Register" */ ++/* Clear */ ++#define I2C_ICR_BREQ_INT_CLR 0x00000008 ++/* Clear */ ++#define I2C_ICR_LBREQ_INT_CLR 0x00000004 ++ ++/* Fields of "I2C Fractional Divider Configuration Register" */ ++/* field offset */ ++#define I2C_FDIV_CFG_DEC_OFFSET 0 ++ ++/* Fields of "I2C Bus Status Register" */ ++/* Bus Status */ ++#define I2C_BUS_STAT_BS_MASK 0x00000003 ++/* Read from I2C Bus. */ ++#define I2C_BUS_STAT_RNW_READ 0x00000004 ++/* I2C Bus is free. */ ++#define I2C_BUS_STAT_BS_FREE 0x00000000 ++/* ++ * The device is working as master and has claimed the control on the ++ * I2C-bus (busy master). ++ */ ++#define I2C_BUS_STAT_BS_BM 0x00000002 ++ ++/* Fields of "I2C RUN Control Register" */ ++/* Enable */ ++#define I2C_RUN_CTRL_RUN_EN 0x00000001 ++ ++/* Fields of "I2C End Data Control Register" */ ++/* ++ * Set End of Transmission ++ * Note:Do not write '1' to this bit when bus is free. This will cause an ++ * abort after the first byte when a new transfer is started. ++ */ ++#define I2C_ENDD_CTRL_SETEND 0x00000002 ++ ++/* Fields of "I2C Protocol Interrupt Request Source Status Register" */ ++/* NACK */ ++#define I2C_P_IRQSS_NACK 0x00000010 ++/* AL */ ++#define I2C_P_IRQSS_AL 0x00000008 ++/* RX */ ++#define I2C_P_IRQSS_RX 0x00000040 ++/* TX_END */ ++#define I2C_P_IRQSS_TX_END 0x00000020 ++ ++ ++#endif /* I2C_LANTIQ_H */ +-- +1.7.10.4 + |