diff options
Diffstat (limited to 'target/linux/lantiq/patches-3.18/0031-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch')
| -rw-r--r-- | target/linux/lantiq/patches-3.18/0031-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch | 1034 |
1 files changed, 0 insertions, 1034 deletions
diff --git a/target/linux/lantiq/patches-3.18/0031-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch b/target/linux/lantiq/patches-3.18/0031-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch deleted file mode 100644 index 4f655db499..0000000000 --- a/target/linux/lantiq/patches-3.18/0031-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch +++ /dev/null @@ -1,1034 +0,0 @@ -From f17e50f67fa3c77624edf2ca03fae0d50f0ce39b Mon Sep 17 00:00:00 2001 -From: John Crispin <blogic@openwrt.org> -Date: Thu, 7 Aug 2014 18:26:42 +0200 -Subject: [PATCH 31/36] 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 - ---- a/drivers/i2c/busses/Kconfig -+++ b/drivers/i2c/busses/Kconfig -@@ -554,6 +554,16 @@ config I2C_KEMPLD - This driver can also be built as a module. If so, the module - will be called i2c-kempld. - -+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 ---- a/drivers/i2c/busses/Makefile -+++ b/drivers/i2c/busses/Makefile -@@ -53,6 +53,7 @@ obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic - obj-$(CONFIG_I2C_IMX) += i2c-imx.o - obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o - obj-$(CONFIG_I2C_KEMPLD) += i2c-kempld.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 ---- /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); ---- /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 */ |