diff options
Diffstat (limited to 'target/linux/lantiq/patches/0011-MIPS-lantiq-adds-falcon-I2C.patch')
| -rw-r--r-- | target/linux/lantiq/patches/0011-MIPS-lantiq-adds-falcon-I2C.patch | 890 |
1 files changed, 890 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches/0011-MIPS-lantiq-adds-falcon-I2C.patch b/target/linux/lantiq/patches/0011-MIPS-lantiq-adds-falcon-I2C.patch new file mode 100644 index 0000000000..eceb1e4f2e --- /dev/null +++ b/target/linux/lantiq/patches/0011-MIPS-lantiq-adds-falcon-I2C.patch @@ -0,0 +1,890 @@ +From 6437f41dfdf9475178e22ab0dd886af033f90cc2 Mon Sep 17 00:00:00 2001 +From: John Crispin <blogic@openwrt.org> +Date: Thu, 29 Sep 2011 21:10:16 +0200 +Subject: [PATCH 11/24] MIPS: lantiq: adds falcon I2C + +--- + arch/mips/lantiq/falcon/devices.c | 21 + + arch/mips/lantiq/falcon/devices.h | 1 + + drivers/i2c/busses/Kconfig | 4 + + drivers/i2c/busses/Makefile | 1 + + drivers/i2c/busses/i2c-falcon.c | 815 +++++++++++++++++++++++++++++++++++++ + 5 files changed, 842 insertions(+), 0 deletions(-) + create mode 100644 drivers/i2c/busses/i2c-falcon.c + +--- a/arch/mips/lantiq/falcon/devices.c ++++ b/arch/mips/lantiq/falcon/devices.c +@@ -126,3 +126,24 @@ falcon_register_gpio_extra(void) + ltq_sysctl_activate(SYSCTL_SYS1, + ACTS_PADCTRL3 | ACTS_PADCTRL4 | ACTS_P3 | ACTS_P4); + } ++ ++/* i2c */ ++static struct resource falcon_i2c_resources[] = { ++ MEM_RES("i2c", GPON_I2C_BASE,GPON_I2C_END), ++ IRQ_RES("i2c_lb", FALCON_IRQ_I2C_LBREQ), ++ IRQ_RES("i2c_b", FALCON_IRQ_I2C_BREQ), ++ IRQ_RES("i2c_err", FALCON_IRQ_I2C_I2C_ERR), ++ IRQ_RES("i2c_p", FALCON_IRQ_I2C_I2C_P), ++}; ++ ++void __init falcon_register_i2c(void) ++{ ++ platform_device_register_simple("i2c-falcon", 0, ++ falcon_i2c_resources, ARRAY_SIZE(falcon_i2c_resources)); ++ sys1_hw_activate(ACTS_I2C_ACT); ++} ++ ++void __init falcon_register_crypto(void) ++{ ++ platform_device_register_simple("ltq_falcon_deu", 0, NULL, 0); ++} +--- a/arch/mips/lantiq/falcon/devices.h ++++ b/arch/mips/lantiq/falcon/devices.h +@@ -16,5 +16,6 @@ + extern void falcon_register_nand(void); + extern void falcon_register_gpio(void); + extern void falcon_register_gpio_extra(void); ++extern void falcon_register_i2c(void); + + #endif +--- a/drivers/i2c/busses/Kconfig ++++ b/drivers/i2c/busses/Kconfig +@@ -284,6 +284,10 @@ config I2C_POWERMAC + + comment "I2C system bus drivers (mostly embedded / system-on-chip)" + ++config I2C_FALCON ++ tristate "Falcon I2C interface" ++# depends on SOC_FALCON ++ + config I2C_AT91 + tristate "Atmel AT91 I2C Two-Wire interface (TWI)" + depends on ARCH_AT91 && EXPERIMENTAL && BROKEN +--- a/drivers/i2c/busses/Makefile ++++ b/drivers/i2c/busses/Makefile +@@ -82,5 +82,6 @@ obj-$(CONFIG_I2C_SIBYTE) += i2c-sibyte.o + obj-$(CONFIG_I2C_STUB) += i2c-stub.o + obj-$(CONFIG_SCx200_ACB) += scx200_acb.o + obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o ++obj-$(CONFIG_I2C_FALCON) += i2c-falcon.o + + ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG +--- /dev/null ++++ b/drivers/i2c/busses/i2c-falcon.c +@@ -0,0 +1,815 @@ ++/* ++ * Lantiq FALC(tm) ON - 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. ++ */ ++ ++/* #define DEBUG */ ++ ++#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/clk.h> ++#include <linux/errno.h> ++#include <linux/sched.h> ++#include <linux/err.h> ++#include <linux/interrupt.h> ++#include <linux/platform_device.h> ++#include <linux/io.h> ++#include <linux/gpio.h> ++ ++#include <falcon/lantiq_soc.h> ++ ++/* CURRENT ISSUES: ++ * - no high speed support ++ * - supports only master mode ++ * - ten bit mode is not tested (no slave devices) ++ */ ++ ++/* mapping for access macros */ ++#define reg_r32(reg) __raw_readl(reg) ++#define reg_w32(val, reg) __raw_writel(val, reg) ++#define reg_w32_mask(clear, set, reg) \ ++ reg_w32((reg_r32(reg) & ~(clear)) | (set), reg) ++#define reg_r32_table(reg, idx) reg_r32(&((uint32_t *)®)[idx]) ++#define reg_w32_table(val, reg, idx) reg_w32(val, &((uint32_t *)®)[idx]) ++#define i2c (priv->membase) ++#include <falcon/i2c_reg.h> ++ ++#define DRV_NAME "i2c-falcon" ++#define DRV_VERSION "1.01" ++ ++#define FALCON_I2C_BUSY_TIMEOUT 20 /* ms */ ++ ++#ifdef DEBUG ++#define FALCON_I2C_XFER_TIMEOUT 25*HZ ++#else ++#define FALCON_I2C_XFER_TIMEOUT HZ ++#endif ++#if defined(DEBUG) && 0 ++#define PRINTK(arg...) printk(arg) ++#else ++#define PRINTK(arg...) do {} while (0) ++#endif ++ ++#define FALCON_I2C_IMSC_DEFAULT_MASK (I2C_IMSC_I2C_P_INT_EN | \ ++ I2C_IMSC_I2C_ERR_INT_EN) ++ ++#define FALCON_I2C_ARB_LOST (1 << 0) ++#define FALCON_I2C_NACK (1 << 1) ++#define FALCON_I2C_RX_UFL (1 << 2) ++#define FALCON_I2C_RX_OFL (1 << 3) ++#define FALCON_I2C_TX_UFL (1 << 4) ++#define FALCON_I2C_TX_OFL (1 << 5) ++ ++struct falcon_i2c { ++ struct mutex mutex; ++ ++ enum { ++ FALCON_I2C_MODE_100 = 1, ++ FALCON_I2C_MODE_400 = 2, ++ FALCON_I2C_MODE_3400 = 3 ++ } mode; /* current speed mode */ ++ ++ struct clk *clk; /* clock input for i2c hardware block */ ++ struct gpon_reg_i2c __iomem *membase; /* base of mapped registers */ ++ int irq_lb, irq_b, irq_err, irq_p; /* last burst, burst, error, ++ protocol IRQs */ ++ ++ struct i2c_adapter adap; ++ struct device *dev; ++ ++ struct completion cmd_complete; ++ ++ /* message transfer data */ ++ /* current message */ ++ struct i2c_msg *current_msg; ++ /* number of messages to handle */ ++ int msgs_num; ++ /* current buffer */ ++ u8 *msg_buf; ++ /* remaining length of current buffer */ ++ u32 msg_buf_len; ++ /* error status of the current transfer */ ++ int msg_err; ++ ++ /* master status codes */ ++ enum { ++ STATUS_IDLE, ++ STATUS_ADDR, /* address phase */ ++ STATUS_WRITE, ++ STATUS_READ, ++ STATUS_READ_END, ++ STATUS_STOP ++ } status; ++}; ++ ++static irqreturn_t falcon_i2c_isr(int irq, void *dev_id); ++ ++static inline void enable_burst_irq(struct falcon_i2c *priv) ++{ ++ i2c_w32_mask(0, I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, imsc); ++} ++static inline void disable_burst_irq(struct falcon_i2c *priv) ++{ ++ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, 0, imsc); ++} ++ ++static void prepare_msg_send_addr(struct falcon_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 set_tx_len(struct falcon_i2c *priv) ++{ ++ struct i2c_msg *msg = priv->current_msg; ++ int len = (msg->flags & I2C_M_TEN) ? 2 : 1; ++ ++ PRINTK("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 falcon_i2c_hw_init(struct i2c_adapter *adap) ++{ ++ struct falcon_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 ++ ++ /* set frequency */ ++ if (priv->mode == FALCON_I2C_MODE_100) { ++ dev_dbg(priv->dev, "set standard mode (100 kHz)\n"); ++ i2c_w32(0, fdiv_high_cfg); ++ i2c_w32((1 << I2C_FDIV_CFG_INC_OFFSET) | ++ (499 << I2C_FDIV_CFG_DEC_OFFSET), ++ fdiv_cfg); ++ } else if (priv->mode == FALCON_I2C_MODE_400) { ++ dev_dbg(priv->dev, "set fast mode (400 kHz)\n"); ++ i2c_w32(0, fdiv_high_cfg); ++ i2c_w32((1 << I2C_FDIV_CFG_INC_OFFSET) | ++ (124 << I2C_FDIV_CFG_DEC_OFFSET), ++ fdiv_cfg); ++ } else if (priv->mode == FALCON_I2C_MODE_3400) { ++ dev_dbg(priv->dev, "set high mode (3.4 MHz)\n"); ++ i2c_w32(0, fdiv_cfg); ++ /* TODO recalculate value for 100MHz input */ ++ i2c_w32((41 << I2C_FDIV_HIGH_CFG_INC_OFFSET) | ++ (152 << I2C_FDIV_HIGH_CFG_DEC_OFFSET), ++ fdiv_high_cfg); ++ } else { ++ dev_warn(priv->dev, "unknown mode\n"); ++ return -ENODEV; ++ } ++ ++ /* 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 falcon_i2c_wait_bus_not_busy(struct falcon_i2c *priv) ++{ ++ int timeout = FALCON_I2C_BUSY_TIMEOUT; ++ ++ while ((i2c_r32(bus_stat) & I2C_BUS_STAT_BS_MASK) ++ != I2C_BUS_STAT_BS_FREE) { ++ if (timeout <= 0) { ++ dev_warn(priv->dev, "timeout waiting for bus ready\n"); ++ return -ETIMEDOUT; ++ } ++ timeout--; ++ mdelay(1); ++ } ++ ++ return 0; ++} ++ ++static void falcon_i2c_tx(struct falcon_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 falcon_i2c_rx(struct falcon_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; ++ PRINTK("\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; ++ } ++ #if 0 ++ fifo_stat = i2c_r32(ffs_stat); ++ #else ++ /* do not read more than burst size, otherwise no "last ++ burst" is generated and the transaction is blocked! */ ++ fifo_stat = 0; ++ #endif ++ } ++ } 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 falcon_i2c_xfer_init(struct falcon_i2c *priv) ++{ ++ /* enable interrupts */ ++ i2c_w32(FALCON_I2C_IMSC_DEFAULT_MASK, imsc); ++ ++ /* trigger transfer of first msg */ ++ set_tx_len(priv); ++} ++ ++static void dump_msgs(struct i2c_msg msgs[], int num, int rx) ++{ ++#if defined(DEBUG) ++ int i, j; ++ printk("Messages %d %s\n", num, rx ? "out" : "in"); ++ for (i = 0; i < num; i++) { ++ printk("%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++) ++ printk("%02X ", msgs[i].buf[j]); ++ } ++ printk("\n"); ++ } ++#endif ++} ++ ++static void falcon_i2c_release_bus(struct falcon_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 falcon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], ++ int num) ++{ ++ struct falcon_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 = falcon_i2c_wait_bus_not_busy(priv); ++ if (ret) ++ goto done; ++ ++ while (priv->msgs_num) { ++ /* start the transfers */ ++ falcon_i2c_xfer_init(priv); ++ ++ /* wait for transfers to complete */ ++ ret = wait_for_completion_interruptible_timeout( ++ &priv->cmd_complete, FALCON_I2C_XFER_TIMEOUT); ++ if (ret == 0) { ++ dev_err(priv->dev, "controller timed out\n"); ++ falcon_i2c_hw_init(adap); ++ ret = -ETIMEDOUT; ++ goto done; ++ } else if (ret < 0) ++ goto done; ++ ++ if (priv->msg_err) { ++ if (priv->msg_err & FALCON_I2C_NACK) ++ ret = -ENXIO; ++ else ++ ret = -EREMOTEIO; ++ goto done; ++ } ++ if (--priv->msgs_num) { ++ priv->current_msg++; ++ } ++ } ++ /* no error? */ ++ ret = num; ++ ++done: ++ falcon_i2c_release_bus(priv); ++ ++ mutex_unlock(&priv->mutex); ++ ++ if (ret>=0) ++ dump_msgs(msgs, num, 1); ++ ++ PRINTK("XFER ret %d\n", ret); ++ return ret; ++} ++ ++static irqreturn_t falcon_i2c_isr_burst(int irq, void *dev_id) ++{ ++ struct falcon_i2c *priv = dev_id; ++ struct i2c_msg *msg = priv->current_msg; ++ int last = (irq == priv->irq_lb); ++ ++ if (last) ++ PRINTK("LB "); ++ else ++ PRINTK("B "); ++ ++ if (msg->flags & I2C_M_RD) { ++ switch (priv->status) { ++ case STATUS_ADDR: ++ PRINTK("X"); ++ prepare_msg_send_addr(priv); ++ disable_burst_irq(priv); ++ break; ++ case STATUS_READ: ++ case STATUS_READ_END: ++ PRINTK("R"); ++ falcon_i2c_rx(priv, last); ++ break; ++ default: ++ disable_burst_irq(priv); ++ printk("Status R %d\n", priv->status); ++ break; ++ } ++ } else { ++ switch (priv->status) { ++ case STATUS_ADDR: ++ PRINTK("x"); ++ prepare_msg_send_addr(priv); ++ break; ++ case STATUS_WRITE: ++ PRINTK("w"); ++ falcon_i2c_tx(priv, last); ++ break; ++ default: ++ disable_burst_irq(priv); ++ printk("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 falcon_i2c_isr_prot(struct falcon_i2c *priv) ++{ ++ u32 i_pro = i2c_r32(p_irqss); ++ ++ PRINTK("i2c-p"); ++ ++ /* not acknowledge */ ++ if (i_pro & I2C_P_IRQSS_NACK) { ++ priv->msg_err |= FALCON_I2C_NACK; ++ PRINTK(" nack"); ++ } ++ ++ /* arbitration lost */ ++ if (i_pro & I2C_P_IRQSS_AL) { ++ priv->msg_err |= FALCON_I2C_ARB_LOST; ++ PRINTK(" arb-lost"); ++ } ++ /* tx -> rx switch */ ++ if (i_pro & I2C_P_IRQSS_RX) ++ PRINTK(" rx"); ++ ++ /* tx end */ ++ if (i_pro & I2C_P_IRQSS_TX_END) ++ PRINTK(" txend"); ++ PRINTK("\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 falcon_i2c_isr(int irq, void *dev_id) ++{ ++ u32 i_raw, i_err=0; ++ struct falcon_i2c *priv = dev_id; ++ ++ i_raw = i2c_r32(mis); ++ PRINTK("i_raw 0x%08X\n", i_raw); ++ ++ /* error interrupt */ ++ if (i_raw & I2C_RIS_I2C_ERR_INT_INTOCC) { ++ i_err = i2c_r32(err_irqss); ++ PRINTK("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 |= FALCON_I2C_TX_OFL; ++ ++ /* tx fifo underflow (4) */ ++ if (i_err & I2C_ERR_IRQSS_TXF_UFL) ++ priv->msg_err |= FALCON_I2C_TX_UFL; ++ ++ /* rx fifo overflow (2) */ ++ if (i_err & I2C_ERR_IRQSS_RXF_OFL) ++ priv->msg_err |= FALCON_I2C_RX_OFL; ++ ++ /* rx fifo underflow (1) */ ++ if (i_err & I2C_ERR_IRQSS_RXF_UFL) ++ priv->msg_err |= FALCON_I2C_RX_UFL; ++ ++ i2c_w32(i_err, err_irqsc); ++ } ++ ++ /* protocol interrupt */ ++ if (i_raw & I2C_RIS_I2C_P_INT_INTOCC) ++ falcon_i2c_isr_prot(priv); ++ ++ if ((priv->msg_err) || (priv->status == STATUS_STOP)) ++ complete(&priv->cmd_complete); ++ ++ return IRQ_HANDLED; ++} ++ ++static u32 falcon_i2c_functionality(struct i2c_adapter *adap) ++{ ++ return I2C_FUNC_I2C | ++ I2C_FUNC_10BIT_ADDR | ++ I2C_FUNC_SMBUS_EMUL; ++} ++ ++static struct i2c_algorithm falcon_i2c_algorithm = { ++ .master_xfer = falcon_i2c_xfer, ++ .functionality = falcon_i2c_functionality, ++}; ++ ++static int __devinit falcon_i2c_probe(struct platform_device *pdev) ++{ ++ int ret = 0; ++ struct falcon_i2c *priv; ++ struct i2c_adapter *adap; ++ struct resource *mmres, *ioarea, ++ *irqres_lb, *irqres_b, *irqres_err, *irqres_p; ++ struct clk *clk; ++ ++ dev_dbg(&pdev->dev, "probing\n"); ++ ++ mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ irqres_lb = platform_get_resource_byname(pdev, IORESOURCE_IRQ, ++ "i2c_lb"); ++ irqres_b = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "i2c_b"); ++ irqres_err = platform_get_resource_byname(pdev, IORESOURCE_IRQ, ++ "i2c_err"); ++ irqres_p = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "i2c_p"); ++ ++ if (!mmres || !irqres_lb || !irqres_b || !irqres_err || !irqres_p) { ++ dev_err(&pdev->dev, "no resources\n"); ++ return -ENODEV; ++ } ++ ++ clk = clk_get(&pdev->dev, "fpi"); ++ if (IS_ERR(clk)) { ++ dev_err(&pdev->dev, "failed to get fpi clk\n"); ++ return -ENOENT; ++ } ++ ++ if (clk_get_rate(clk) != 100000000) { ++ dev_err(&pdev->dev, "input clock is not 100MHz\n"); ++ return -ENOENT; ++ } ++ ++ /* allocate private data */ ++ priv = kzalloc(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 = &falcon_i2c_algorithm; ++ ++ priv->mode = FALCON_I2C_MODE_100; ++ priv->clk = clk; ++ priv->dev = &pdev->dev; ++ ++ init_completion(&priv->cmd_complete); ++ mutex_init(&priv->mutex); ++ ++ ret = ltq_gpio_request(107, 0, 0, 0, DRV_NAME":sda"); ++ if (ret) { ++ dev_err(&pdev->dev, "I2C gpio 107 (sda) not available\n"); ++ ret = -ENXIO; ++ goto err_free_priv; ++ } ++ ret = ltq_gpio_request(108, 0, 0, 0, DRV_NAME":scl"); ++ if (ret) { ++ gpio_free(107); ++ dev_err(&pdev->dev, "I2C gpio 108 (scl) not available\n"); ++ ret = -ENXIO; ++ goto err_free_priv; ++ } ++ ++ ioarea = request_mem_region(mmres->start, resource_size(mmres), ++ pdev->name); ++ ++ if (ioarea == NULL) { ++ dev_err(&pdev->dev, "I2C region already claimed\n"); ++ ret = -ENXIO; ++ goto err_free_gpio; ++ } ++ ++ /* map memory */ ++ priv->membase = ioremap_nocache(mmres->start & ~KSEG1, ++ resource_size(mmres)); ++ if (priv->membase == NULL) { ++ ret = -ENOMEM; ++ goto err_release_region; ++ } ++ ++ priv->irq_lb = irqres_lb->start; ++ ret = request_irq(priv->irq_lb, falcon_i2c_isr_burst, IRQF_DISABLED, ++ irqres_lb->name, priv); ++ if (ret) { ++ dev_err(&pdev->dev, "can't get last burst IRQ %d\n", irqres_lb->start); ++ ret = -ENODEV; ++ goto err_unmap_mem; ++ } ++ ++ priv->irq_b = irqres_b->start; ++ ret = request_irq(priv->irq_b, falcon_i2c_isr_burst, IRQF_DISABLED, ++ irqres_b->name, priv); ++ if (ret) { ++ dev_err(&pdev->dev, "can't get burst IRQ %d\n", irqres_b->start); ++ ret = -ENODEV; ++ goto err_free_lb_irq; ++ } ++ ++ priv->irq_err = irqres_err->start; ++ ret = request_irq(priv->irq_err, falcon_i2c_isr, IRQF_DISABLED, ++ irqres_err->name, priv); ++ if (ret) { ++ dev_err(&pdev->dev, "can't get error IRQ %d\n", irqres_err->start); ++ ret = -ENODEV; ++ goto err_free_b_irq; ++ } ++ ++ priv->irq_p = irqres_p->start; ++ ret = request_irq(priv->irq_p, falcon_i2c_isr, IRQF_DISABLED, ++ irqres_p->name, priv); ++ if (ret) { ++ dev_err(&pdev->dev, "can't get protocol IRQ %d\n", irqres_p->start); ++ ret = -ENODEV; ++ goto err_free_err_irq; ++ } ++ ++ dev_dbg(&pdev->dev, "mapped io-space to %p\n", priv->membase); ++ dev_dbg(&pdev->dev, "use IRQs %d, %d, %d, %d\n", irqres_lb->start, ++ irqres_b->start, irqres_err->start, irqres_p->start); ++ ++ /* 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 err_free_p_irq; ++ } ++ ++ 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 = falcon_i2c_hw_init(adap); ++ if (ret) { ++ dev_err(&pdev->dev, "can't configure adapter\n"); ++ goto err_remove_adapter; ++ } ++ ++ dev_info(&pdev->dev, "version %s\n", DRV_VERSION); ++ ++ return 0; ++ ++err_remove_adapter: ++ i2c_del_adapter(adap); ++ platform_set_drvdata(pdev, NULL); ++ ++err_free_p_irq: ++ free_irq(priv->irq_p, priv); ++ ++err_free_err_irq: ++ free_irq(priv->irq_err, priv); ++ ++err_free_b_irq: ++ free_irq(priv->irq_b, priv); ++ ++err_free_lb_irq: ++ free_irq(priv->irq_lb, priv); ++ ++err_unmap_mem: ++ iounmap(priv->membase); ++ ++err_release_region: ++ release_mem_region(mmres->start, resource_size(mmres)); ++ ++err_free_gpio: ++ gpio_free(108); ++ gpio_free(107); ++ ++err_free_priv: ++ kfree(priv); ++ ++ return ret; ++} ++ ++static int __devexit falcon_i2c_remove(struct platform_device *pdev) ++{ ++ struct falcon_i2c *priv = platform_get_drvdata(pdev); ++ struct resource *mmres; ++ ++ /* disable bus */ ++ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl); ++ ++ /* remove driver */ ++ platform_set_drvdata(pdev, NULL); ++ i2c_del_adapter(&priv->adap); ++ ++ free_irq(priv->irq_lb, priv); ++ free_irq(priv->irq_b, priv); ++ free_irq(priv->irq_err, priv); ++ free_irq(priv->irq_p, priv); ++ ++ iounmap(priv->membase); ++ ++ gpio_free(108); ++ gpio_free(107); ++ ++ kfree(priv); ++ ++ mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ release_mem_region(mmres->start, resource_size(mmres)); ++ ++ dev_dbg(&pdev->dev, "removed\n"); ++ ++ return 0; ++} ++ ++static struct platform_driver falcon_i2c_driver = { ++ .probe = falcon_i2c_probe, ++ .remove = __devexit_p(falcon_i2c_remove), ++ .driver = { ++ .name = DRV_NAME, ++ .owner = THIS_MODULE, ++ }, ++}; ++ ++static int __init falcon_i2c_init(void) ++{ ++ int ret; ++ ++ ret = platform_driver_register(&falcon_i2c_driver); ++ ++ if (ret) ++ pr_debug(DRV_NAME ": can't register platform driver\n"); ++ ++ return ret; ++} ++ ++static void __exit falcon_i2c_exit(void) ++{ ++ platform_driver_unregister(&falcon_i2c_driver); ++} ++ ++module_init(falcon_i2c_init); ++module_exit(falcon_i2c_exit); ++ ++MODULE_DESCRIPTION("Lantiq FALC(tm) ON - I2C bus adapter"); ++MODULE_ALIAS("platform:" DRV_NAME); ++MODULE_LICENSE("GPL"); ++MODULE_VERSION(DRV_VERSION); |