diff options
Diffstat (limited to 'target/linux/lantiq/patches-3.0/120-falcon-i2c.patch')
-rw-r--r-- | target/linux/lantiq/patches-3.0/120-falcon-i2c.patch | 828 |
1 files changed, 828 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-3.0/120-falcon-i2c.patch b/target/linux/lantiq/patches-3.0/120-falcon-i2c.patch new file mode 100644 index 0000000..c5d39c8 --- /dev/null +++ b/target/linux/lantiq/patches-3.0/120-falcon-i2c.patch @@ -0,0 +1,828 @@ +--- 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 +--- a/drivers/i2c/busses/Kconfig ++++ b/drivers/i2c/busses/Kconfig +@@ -282,6 +282,10 @@ 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 +--- /dev/null ++++ b/drivers/i2c/busses/i2c-falcon.c +@@ -0,0 +1,803 @@ ++/* ++ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. ++ */ ++ ++/* #define DEBUG */ ++ ++#include <linux/module.h> ++#include <linux/ioport.h> ++#include <linux/init.h> ++#include <linux/platform_device.h> ++#include <linux/i2c.h> ++#include <linux/interrupt.h> ++#include <linux/spinlock.h> ++#include <linux/io.h> ++#include <linux/clk.h> ++#include <linux/err.h> ++#include <linux/slab.h> ++ ++/* CURRENT ISSUES: ++ * - no high speed support ++ * - rx issue with "address mode" & "tx end" interrupts ++ * - ten bit mode is not tested ++ */ ++ ++/* 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> ++ ++/* enable hacks to overcome current issue */ ++#define FALCON_FIX_ME ++ ++#define FALCON_I2C_ADDR 0x00 ++#define FALCON_I2C_READY_TIMEOUT 1000 ++#define FALCON_I2C_WAIT_TIMEOUT 10 ++ ++#define DRV_NAME "i2c-falcon" ++ ++#if defined(DEBUG) ++#define static /* no static functions for better debugging */ ++#endif ++ ++#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) ++#define FALCON_I2C_BURST_REQ (1 << 6) ++#define FALCON_I2C_RX (1 << 7) ++#define FALCON_I2C_TX_END (1 << 8) ++#define FALCON_I2C_ADDR_MATCH (1 << 9) /* doesn't trigger */ ++ ++struct falcon_i2c { ++ spinlock_t lock; ++ ++ enum { ++ FALCON_I2C_MODE_100 = 1, ++ FALCON_I2C_MODE_400 = 2, ++ FALCON_I2C_MODE_3400 = 3 ++ } mode; /* current speed mode */ ++ ++ int ten_bit; /* current address mode */ ++ unsigned long status; /* bus events holder */ ++ 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 completion done; ++ struct i2c_adapter adap; ++ struct device *dev; ++}; ++ ++#define FALCON_I2C_ERROR_MASK (FALCON_I2C_NACK \ ++ | FALCON_I2C_ARB_LOST \ ++ | FALCON_I2C_RX_OFL \ ++ | FALCON_I2C_RX_UFL \ ++ | FALCON_I2C_TX_OFL \ ++ | FALCON_I2C_TX_UFL) ++ ++#define FALCON_I2C_ERROR(priv) (priv->status & FALCON_I2C_ERROR_MASK) ++#define FALCON_I2C_ERROR_CLEAR(priv) do { \ ++ priv->status &= \ ++ ~FALCON_I2C_ERROR_MASK; \ ++ } while (0) ++ ++static void falcon_addr_configure(struct falcon_i2c *priv, int ten_bit) ++{ ++ u32 ten_bit_mask = ten_bit ? I2C_ADDR_CFG_TBAM_10bit : 0; ++ ++ /* 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 */ ++ | ten_bit_mask ++ | FALCON_I2C_ADDR, /* our address */ ++ addr_cfg); ++} ++ ++static irqreturn_t falcon_i2c_isr(int irq, void *dev_id) ++{ ++ u32 i_raw, i_pro, i_err; ++ struct falcon_i2c *priv = dev_id; ++ unsigned long flags; ++ unsigned int old_status; ++ ++ spin_lock_irqsave(&priv->lock, flags); ++ ++ old_status = (unsigned int)priv->status; ++ ++ i_raw = i2c_r32(mis); ++ ++ /* protocol interrupt */ ++ if (i_raw & I2C_RIS_I2C_P_INT_INTOCC) { ++ i_pro = i2c_r32(p_irqss); ++ ++ /* tx -> rx switch */ ++ if (i_pro & I2C_P_IRQSS_RX) ++ priv->status |= FALCON_I2C_RX; ++ ++ /* tx end */ ++ if (i_pro & I2C_P_IRQSS_TX_END) ++ priv->status |= FALCON_I2C_TX_END; ++ ++ /* not acknowledge */ ++ if (i_pro & I2C_P_IRQSS_NACK) ++ priv->status |= FALCON_I2C_NACK; ++ ++ /* arbitration lost */ ++ if (i_pro & I2C_P_IRQSS_AL) ++ priv->status |= FALCON_I2C_ARB_LOST; ++ ++ /* address match */ ++ if (i_pro & I2C_P_IRQSS_AM) ++ priv->status |= FALCON_I2C_ADDR_MATCH; ++ ++ i2c_w32(i_pro, p_irqsc); ++ } ++ ++ /* error interrupt */ ++ if (i_raw & I2C_RIS_I2C_ERR_INT_INTOCC) { ++ i_err = i2c_r32(err_irqss); ++ ++ /* tx fifo overflow */ ++ if (i_err & I2C_ERR_IRQSS_TXF_OFL) ++ priv->status |= FALCON_I2C_TX_OFL; ++ ++ /* tx fifo underflow */ ++ if (i_err & I2C_ERR_IRQSS_TXF_UFL) ++ priv->status |= FALCON_I2C_TX_UFL; ++ ++ /* rx fifo overflow */ ++ if (i_err & I2C_ERR_IRQSS_RXF_OFL) ++ priv->status |= FALCON_I2C_RX_OFL; ++ ++ /* rx fifo underflow */ ++ if (i_err & I2C_ERR_IRQSS_RXF_UFL) ++ priv->status |= FALCON_I2C_RX_UFL; ++ ++ i2c_w32(i_err, err_irqsc); ++ } ++ ++ /* burst request */ ++ if (i_raw & I2C_RIS_BREQ_INT_INTOCC) { ++ i2c_w32_mask(I2C_IMSC_BREQ_INT_EN, 0, imsc); ++ i2c_w32_mask(0, I2C_ICR_BREQ_INT_CLR, icr); ++ ++ priv->status |= FALCON_I2C_BURST_REQ; ++ } ++ ++ /* last burst request */ ++ if (i_raw & I2C_RIS_LBREQ_INT_INTOCC) { ++ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN, 0, imsc); ++ i2c_w32_mask(0, I2C_ICR_LBREQ_INT_CLR, icr); ++ ++ priv->status |= FALCON_I2C_BURST_REQ; ++ } ++ ++ if (old_status != (unsigned int)priv->status) ++ complete(&priv->done); ++ ++ spin_unlock_irqrestore(&priv->lock, flags); ++ ++ return IRQ_HANDLED; ++} ++ ++static int falcon_i2c_ready(struct falcon_i2c *priv) ++{ ++ int timeout; ++ u32 bus_stat; ++ unsigned long flags; ++ int ret; ++ ++ for (timeout = 0; timeout < FALCON_I2C_READY_TIMEOUT; timeout++) { ++ bus_stat = i2c_r32(bus_stat); ++ ++ if (bus_stat & I2C_BUS_STAT_BS_SC) { ++ cpu_relax(); ++ } else { ++ spin_lock_irqsave(&priv->lock, flags); ++ ++ if (FALCON_I2C_ERROR(priv)) { ++ ret = priv->status; ++ ++ dev_dbg(priv->dev, "bus ready wait error 0x%08lx\n", priv->status); ++ ++ FALCON_I2C_ERROR_CLEAR(priv); ++ } else { ++ ret = 0; ++ } ++ ++ spin_unlock_irqrestore(&priv->lock, flags); ++ ++ return ret; ++ } ++ } ++ ++ dev_dbg(priv->dev, "bus ready wait timeout\n"); ++ ++ return -ETIME; ++} ++ ++static int falcon_i2c_wait(struct falcon_i2c *priv, unsigned long status) ++{ ++ int ret = 0; ++ unsigned long flags; ++ unsigned int timeout; ++ ++ spin_lock_irqsave(&priv->lock, flags); ++ ++ priv->status &= FALCON_I2C_BURST_REQ; ++ ++ /* check if the event already occurred */ ++ if ((priv->status & status) == status) { ++ priv->status &= ~status; ++ spin_unlock_irqrestore(&priv->lock, flags); ++ ++ return 0; ++ } ++ ++ spin_unlock_irqrestore(&priv->lock, flags); ++ ++ /* unmask burst interrupts */ ++ i2c_w32_mask(0, I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, imsc); ++ ++ for (timeout = 0; timeout < FALCON_I2C_WAIT_TIMEOUT; timeout++) { ++ /* wait for the data request */ ++ wait_for_completion_timeout(&priv->done, HZ / 10); ++ ++ /* handle errors */ ++ spin_lock_irqsave(&priv->lock, flags); ++ ++ if (FALCON_I2C_ERROR(priv)) { ++ dev_dbg(priv->dev, "wait error 0x%08lx (waiting for 0x%08lx)\n", ++ priv->status, ++ status); ++ ++ if (priv->status & FALCON_I2C_NACK) ++ ret = -ENXIO; ++ else ++ ret = -EREMOTEIO; ++ ++ FALCON_I2C_ERROR_CLEAR(priv); ++ } else { ++ if ((priv->status & status) == status) { ++ priv->status &= ~status; ++ spin_unlock_irqrestore(&priv->lock, flags); ++ ++ return 0; ++ } ++ } ++ ++ spin_unlock_irqrestore(&priv->lock, flags); ++ ++ if (ret) ++ return ret; ++ } ++ ++ dev_dbg(priv->dev, "wait timeout error 0x%08lx (waiting for 0x%08lx)\n", ++ priv->status, ++ status); ++ ++ return -ETIME; ++} ++ ++static int falcon_i2c_tx(struct falcon_i2c *priv, int ten_bit, u16 addr, ++ u8 *buf, int len) ++{ ++ int i; ++ int ret; ++ ++ dev_dbg(priv->dev, "%s\n", __func__); ++ ++ /* tell fifo the number of bytes we are going to send */ ++ i2c_w32(len + (ten_bit ? 2 : 1), tps_ctrl); ++ ++ /* wait for the data request */ ++ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ); ++ if (ret) ++ return ret; ++ ++ /* send slave address */ ++ if (ten_bit) { ++ i2c_w32(0x78 | ((addr >> 7) & 0x7), txd); ++ i2c_w32(0x78 | ((addr & 0x7f) << 1) | 0, txd); ++ } else { ++ i2c_w32((addr << 1) | 0, txd); ++ } ++ ++ /* fill fifo */ ++ for (i = 0; i < len; i++) { ++ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ); ++ if (ret) ++ return ret; ++ ++ i2c_w32(buf[i], txd); ++ } ++ ++ return falcon_i2c_wait(priv, FALCON_I2C_TX_END); ++} ++ ++static int falcon_i2c_rx(struct falcon_i2c *priv, int ten_bit, u16 addr, ++ u8 *buf, int len) ++{ ++ int i; ++ int ret; ++ ++ dev_dbg(priv->dev, "%s\n", __func__); ++ ++ /* we need to transmit address only */ ++ i2c_w32(ten_bit ? 2 : 1, tps_ctrl); ++ ++ /* set maximum received packet size */ ++ i2c_w32(len, mrps_ctrl); ++ ++ /* wait for the data request */ ++ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ); ++ if (ret) ++ return ret; ++ ++ /* write down the address */ ++ if (ten_bit) { ++ i2c_w32(0x78 | ((addr >> 7) & 0x7), txd); ++ i2c_w32(0x78 | ((addr & 0x7f) << 1) | 1, txd); ++ } else { ++ i2c_w32((addr << 1) | 1, txd); ++ } ++ ++ /* wait for the read request */ ++ ret = falcon_i2c_wait(priv, FALCON_I2C_TX_END ++#ifndef FALCON_FIX_ME ++ | FALCON_I2C_ADDR_MATCH ++#endif ++ | FALCON_I2C_RX); ++ ++ if (ret) ++ return ret; ++ ++ /* read bytes */ ++ for (i = 0; i < len; i++) { ++#ifdef FALCON_FIX_ME ++ while (i2c_r32(rps_stat) == 0) ++ cpu_relax(); ++#else ++ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ); ++ ++ if (ret) ++ return ret; ++#endif ++ ++ buf[i] = i2c_r32(rxd); ++ } ++ ++#ifndef FALCON_FIX_ME ++ /* wait for transmission end */ ++ return falcon_i2c_wait(priv, FALCON_I2C_TX_END); ++#else ++ return 0; ++#endif ++} ++ ++static int falcon_i2c_xfer_msg(struct falcon_i2c *priv, struct i2c_msg *msg) ++{ ++ int ret; ++ int ten_bit; ++ unsigned long flags; ++ ++ dev_dbg(priv->dev, "%s %u byte(s) %s 0x%02x\n", ++ (msg->flags & I2C_M_RD) ? "read" : "write", msg->len, ++ (msg->flags & I2C_M_RD) ? "from" : "to", msg->addr); ++ ++ if (msg->flags & I2C_M_TEN) ++ ten_bit = 1; ++ else ++ ten_bit = 0; ++ ++ /* reconfigure bus if need to send message in different address mode */ ++ spin_lock_irqsave(&priv->lock, flags); ++ if (ten_bit != priv->ten_bit) { ++ ++ /* disable bus */ ++ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl); ++ ++ /* reconfigure address */ ++ falcon_addr_configure(priv, ten_bit); ++ ++ /* enable bus */ ++ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl); ++ ++ priv->ten_bit = ten_bit; ++ } ++ spin_unlock_irqrestore(&priv->lock, flags); ++ ++ /* read/write actual message */ ++ if (msg->flags & I2C_M_RD) ++ ret = falcon_i2c_rx(priv, ten_bit, msg->addr, msg->buf, ++ msg->len); ++ else ++ ret = falcon_i2c_tx(priv, ten_bit, msg->addr, msg->buf, ++ msg->len); ++ ++ if (ret) ++ return ret; ++ ++ return 0; ++} ++ ++static int falcon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, ++ int num) ++{ ++ int i; ++ int ret; ++ unsigned long flags; ++ struct falcon_i2c *priv = i2c_get_adapdata(adap); ++ ++ dev_dbg(priv->dev, "xfer %u messages\n", num); ++ ++ /* transfer each message */ ++ for (i = 0; i < num; i++) { ++#ifdef FALCON_FIX_ME ++ /* disable bus */ ++ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl); ++ /* enable bus */ ++ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl); ++#endif ++ ++ /* clear bus status */ ++ spin_lock_irqsave(&priv->lock, flags); ++ priv->status = 0; ++ spin_unlock_irqrestore(&priv->lock, flags); ++ ++ /* wait for the bus to become ready */ ++ ret = falcon_i2c_ready(priv); ++ if (ret) ++ return ret; ++ ++ /* transfer message */ ++ ret = falcon_i2c_xfer_msg(priv, &msg[i]); ++ ++ if (ret) ++ return ret; ++ ++ /* check for unhandled errors */ ++ spin_lock_irqsave(&priv->lock, flags); ++ if (FALCON_I2C_ERROR(priv)) ++ ret = priv->status; ++ spin_unlock_irqrestore(&priv->lock, flags); ++ ++ if (ret) { ++ dev_warn(priv->dev, "message %u unhandled error 0x%x\n", ++ i, ret); ++ ++ return ret; ++ } ++ } ++ ++ return 0; ++} ++ ++static u32 falcon_i2c_func(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_func, ++}; ++ ++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); ++ ++ /* set normal operation clock divider */ ++ i2c_w32(1 << I2C_CLC_RMC_OFFSET, clc); ++ ++ /* 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_CFG_INC_OFFSET) ++ | (152 << I2C_FDIV_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 */ ++ falcon_addr_configure(priv, priv->ten_bit); ++ ++ /* enable bus */ ++ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl); ++ ++ /* mask burst interrupts */ ++ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, 0, imsc); ++ ++ /* enable interrupts */ ++ i2c_w32(I2C_IMSC_LBREQ_INT_EN ++ | I2C_IMSC_BREQ_INT_EN ++ | I2C_IMSC_I2C_P_INT_EN ++ | I2C_IMSC_I2C_ERR_INT_EN, ++ imsc); ++ ++ return 0; ++} ++ ++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->ten_bit = 0; ++ priv->mode = FALCON_I2C_MODE_100; ++ priv->clk = clk; ++ priv->dev = &pdev->dev; ++ ++ spin_lock_init(&priv->lock); ++ ++ 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_priv; ++ } ++ ++ /* 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, 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, 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); ++ ++ init_completion(&priv->done); ++ ++ /* initialize HW */ ++ ret = falcon_i2c_hw_init(adap); ++ if (ret) { ++ dev_err(&pdev->dev, "can't configure adapter\n"); ++ goto err_remove_adapter; ++ } ++ ++ 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_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); ++ ++ 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) ++ printk(KERN_DEBUG DRV_NAME ": can't register platform driver"); ++ ++ 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:i2c_falcon"); ++MODULE_LICENSE("GPL"); |