On Mon, 2009-06-22 at 01:47 +0100, Ben Dooks wrote: > On Tue, Jun 16, 2009 at 08:31:53PM +0400, dmitry pervushin wrote: > > On Mon, 2009-06-15 at 09:19 +0100, Ben Dooks wrote: > > > any chance of an reply or update driver for inclusion? > > Here it is: > > > > From: Dmitrij Frasenyak <[email protected]> > > Signed-off-by: dmitry pervushin <[email protected]> > > > > Add I2C driver for Freescale STMP boards
From: Dmitrij Frasenyak <[email protected]> Signed-off-by: Dmitrij Frasenyak <[email protected]> Signed-off-by: dmitry pervushin <[email protected]> > > > --- > > drivers/i2c/busses/Kconfig | 7 > > drivers/i2c/busses/Makefile | 1 > > drivers/i2c/busses/i2c-stmp378x.c | 448 > > ++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 456 insertions(+) > > > > Index: linux-2.6-arm/drivers/i2c/busses/Kconfig > > =================================================================== > > --- linux-2.6-arm.orig/drivers/i2c/busses/Kconfig > > +++ linux-2.6-arm/drivers/i2c/busses/Kconfig > > @@ -513,6 +513,13 @@ config I2C_SIMTEC > > This driver can also be built as a module. If so, the module > > will be called i2c-simtec. > > > > +config I2C_STMP378X > > + tristate "STMP378x I2C adapter" > > + depends on ARCH_STMP378X > > + help > > + Include support of I2C adapter on Freescale STMP378x board; to build > > + the driver as a module, say M here - module will be called > > i2c-stmp378x. > > + > > config I2C_VERSATILE > > tristate "ARM Versatile/Realview I2C bus support" > > depends on ARCH_VERSATILE || ARCH_REALVIEW > > Index: linux-2.6-arm/drivers/i2c/busses/Makefile > > =================================================================== > > --- linux-2.6-arm.orig/drivers/i2c/busses/Makefile > > +++ linux-2.6-arm/drivers/i2c/busses/Makefile > > @@ -48,6 +48,7 @@ obj-$(CONFIG_I2C_S6000) += i2c-s6000.o > > obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o > > obj-$(CONFIG_I2C_SH_MOBILE) += i2c-sh_mobile.o > > obj-$(CONFIG_I2C_SIMTEC) += i2c-simtec.o > > +obj-$(CONFIG_I2C_STMP378X) += i2c-stmp378x.o > > obj-$(CONFIG_I2C_VERSATILE) += i2c-versatile.o > > > > # External I2C/SMBus adapter drivers > > Index: linux-2.6-arm/drivers/i2c/busses/i2c-stmp378x.c > > =================================================================== > > --- /dev/null > > +++ linux-2.6-arm/drivers/i2c/busses/i2c-stmp378x.c > > @@ -0,0 +1,448 @@ > > +/* > > + * Freescale STMP378X I2C bus driver > > + * > > + * Author: Dmitrij Frasenyak <[email protected]> > > + * > > + * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved. > > + * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. > > + */ > > + > > +/* > > + * The code contained herein is licensed under the GNU General Public > > + * License. You may obtain a copy of the GNU General Public License > > + * Version 2 or later at the following locations: > > + * > > + * http://www.opensource.org/licenses/gpl-license.html > > + * http://www.gnu.org/copyleft/gpl.html > > + */ > > +#include <linux/module.h> > > +#include <linux/delay.h> > > +#include <linux/i2c.h> > > +#include <linux/err.h> > > +#include <linux/interrupt.h> > > +#include <linux/completion.h> > > +#include <linux/platform_device.h> > > +#include <linux/clk.h> > > +#include <linux/io.h> > > +#include <linux/dma-mapping.h> > > + > > +#include <mach/platform.h> > > +#include <mach/stmp3xxx.h> > > +#include <mach/dma.h> > > +#include <mach/regs-i2c.h> > > +#include <mach/regs-apbx.h> > > + > > +static const struct stmp3xxx_dma_command cmd_i2c_select = { > > + .cmd = BF(1, APBX_CHn_CMD_XFER_COUNT) | > > + BF(1, APBX_CHn_CMD_CMDWORDS) | > > + BM_APBX_CHn_CMD_WAIT4ENDCMD | > > + BM_APBX_CHn_CMD_CHAIN | > > + BF(BV_APBX_CHn_CMD_COMMAND__DMA_READ, APBX_CHn_CMD_COMMAND), > > + .pio_words = { > > + [0] = BM_I2C_CTRL0_RETAIN_CLOCK | > > + BM_I2C_CTRL0_PRE_SEND_START | > > + BM_I2C_CTRL0_MASTER_MODE | > > + BM_I2C_CTRL0_DIRECTION | > > + BF(1, I2C_CTRL0_XFER_COUNT), > > + }, > > +}; > > + > > +static const struct stmp3xxx_dma_command cmd_i2c_write = { > > + .cmd = BM_APBX_CHn_CMD_SEMAPHORE | > > + BF(1, APBX_CHn_CMD_CMDWORDS) | > > + BM_APBX_CHn_CMD_WAIT4ENDCMD | > > + BM_APBX_CHn_CMD_IRQONCMPLT | > > + BF(BV_APBX_CHn_CMD_COMMAND__DMA_READ, APBX_CHn_CMD_COMMAND), > > + .pio_words = { > > + [0] = BM_I2C_CTRL0_PRE_SEND_START | > > + BM_I2C_CTRL0_MASTER_MODE | > > + BM_I2C_CTRL0_DIRECTION, > > + }, > > +}; > > + > > +static const struct stmp3xxx_dma_command cmd_i2c_read = { > > + .cmd = BM_APBX_CHn_CMD_SEMAPHORE | > > + BF(1, APBX_CHn_CMD_CMDWORDS) | > > + BM_APBX_CHn_CMD_WAIT4ENDCMD | > > + BM_APBX_CHn_CMD_IRQONCMPLT | > > + BF(BV_APBX_CHn_CMD_COMMAND__DMA_WRITE, APBX_CHn_CMD_COMMAND), > > + .pio_words = { > > + [0] = BM_I2C_CTRL0_SEND_NAK_ON_LAST | > > + BM_I2C_CTRL0_MASTER_MODE, > > + }, > > +}; > > + > > +/** > > + * struct stmp378x_i2c_dev - STMP3xxx I2C adapter data > > + * @dev: the associated platform_device > > + * @cmd_complete: the completion structure indicating that message has been > > + * transferred > > + * @cmd_err: current error code > > + * @adapter: the adapter we implement > > + * @io: io address > > + * @irq: irq number > > + * @dma: dma channel > > + * @bufv: pointer to the dma buffer > > + * @bufp: physical address of the dma buffer > > + * @i2c_dma_read: "read" dma chain (read request and then write) > > + * @i2c_dma_write: "write" dma chain (the single combined write request) > > + */ > > +struct stmp378x_i2c_dev { > > + struct device *dev; > > + int irq; > > + struct completion cmd_complete; > > + u32 cmd_err; > > + struct i2c_adapter adapter; > > + void __iomem *io; > > + unsigned dma; > > + > > + dma_addr_t bufp; > > + unsigned char *bufv; > > + > > + struct stmp3xxx_dma_descriptor i2c_dma_read[2], > > + i2c_dma_write; > > +}; > > + > > +static int stmp378x_i2c_init(struct stmp378x_i2c_dev *dev) > > +{ > > + int err; > > + > > + err = stmp3xxx_dma_request(dev->dma, dev->dev, dev_name(dev->dev)); > > + if (err) > > + goto out; > > + stmp3xxx_reset_block(dev->io, true); > > + > > + dev->bufv = dma_alloc_coherent(dev->dev, PAGE_SIZE, > > + &dev->bufp, GFP_KERNEL); > > + if (!dev->bufv) > > + goto out_dma; > > + > > + err = stmp3xxx_request_pin_group(dev->dev->platform_data, > > + dev_name(dev->dev)); > > + if (err) > > + goto out_free; > > + > > + err = stmp3xxx_dma_allocate_command(dev->dma, &dev->i2c_dma_read[0]); > > + if (err) > > + goto out_rd0; > > + err = stmp3xxx_dma_allocate_command(dev->dma, &dev->i2c_dma_read[1]); > > + if (err) > > + goto out_rd1; > > + err = stmp3xxx_dma_allocate_command(dev->dma, &dev->i2c_dma_write); > > + if (err) > > + goto out_wr; > > + > > + stmp3xxx_dma_reset_channel(dev->dma); > > + stmp3xxx_dma_clear_interrupt(dev->dma); > > + stmp3xxx_dma_enable_interrupt(dev->dma); > > + > > + return 0; > > +/* > > + stmp3xxx_dma_free_command(dev->dma, &dev->i2c_dma_write); > > +*/ > > +out_wr: > > + stmp3xxx_dma_free_command(dev->dma, &dev->i2c_dma_read[1]); > > +out_rd1: > > + stmp3xxx_dma_free_command(dev->dma, &dev->i2c_dma_read[0]); > > +out_rd0: > > + stmp3xxx_release_pin_group(dev->dev->platform_data, dev_name(dev->dev)); > > +out_free: > > + dma_free_coherent(dev->dev, PAGE_SIZE, dev->bufv, dev->bufp); > > +out_dma: > > + stmp3xxx_dma_release(dev->dma); > > +out: > > + return err; > > +} > > + > > +static void stmp378x_i2c_release(struct stmp378x_i2c_dev *dev) > > +{ > > + stmp3xxx_dma_free_command(dev->dma, &dev->i2c_dma_write); > > + stmp3xxx_dma_free_command(dev->dma, &dev->i2c_dma_read[1]); > > + stmp3xxx_dma_free_command(dev->dma, &dev->i2c_dma_read[0]); > > + dma_free_coherent(dev->dev, PAGE_SIZE, dev->bufv, dev->bufp); > > + stmp3xxx_release_pin_group(dev->dev->platform_data, dev_name(dev->dev)); > > + stmp3xxx_dma_release(dev->dma); > > +} > > +/* > > + * Low level master read/write transaction. > > + */ > > +static int stmp378x_i2c_xfer_msg(struct i2c_adapter *adap, > > + struct i2c_msg *msg, int stop) > > +{ > > + struct stmp378x_i2c_dev *dev = i2c_get_adapdata(adap); > > + int err; > > + struct stmp3xxx_dma_descriptor *c, *r; > > + > > + init_completion(&dev->cmd_complete); > > + dev->cmd_err = 0; > > + > > + if ((msg->len == 0) || (msg->len > (PAGE_SIZE - 1))) > > + return -EINVAL; > > + > > + if (msg->flags & I2C_M_RD) { > > + > > + c = &dev->i2c_dma_read[0]; > > + r = &dev->i2c_dma_read[1]; > > + > > + /* first, setup the SELECT command */ > > + memcpy(c->command, &cmd_i2c_select, sizeof(cmd_i2c_select)); > > + c->command->buf_ptr = dev->bufp; > > + dev->bufv[0] = msg->addr | I2C_SMBUS_READ; > > + > > + /* then, setup the READ command */ > > + memcpy(r->command, &cmd_i2c_read, sizeof(cmd_i2c_read)); > > + r->command->cmd |= BF(msg->len, APBX_CHn_CMD_XFER_COUNT); > > + r->command->pio_words[0] |= BF(msg->len, I2C_CTRL0_XFER_COUNT); > > + if (stop) > > + r->command->pio_words[0] |= BM_I2C_CTRL0_POST_SEND_STOP; > > + /* > > + * yes, STMP controller can DMA transfer the data from any > > + * byte boundary > > + */ > > + r->command->buf_ptr = dev->bufp + 1; > > + > > + /* and chain them together */ > > + c->command->next = r->handle; > > + > > + } else { > > + > > + c = &dev->i2c_dma_write; > > + memcpy(c->command, &cmd_i2c_write, sizeof(cmd_i2c_write)); > > + c->command->cmd |= BF(msg->len + 1, APBX_CHn_CMD_XFER_COUNT); > > + c->command->pio_words[0] |= > > + BF(msg->len + 1, I2C_CTRL0_XFER_COUNT); > > + if (stop) > > + c->command->pio_words[0] |= > > + BM_I2C_CTRL0_POST_SEND_STOP; > > + dev->bufv[0] = msg->addr | I2C_SMBUS_WRITE; > > + memcpy(dev->bufv + 1, msg->buf, msg->len); > > + } > > + > > + stmp3xxx_dma_go(dev->dma, c, 1); > > + > > + err = wait_for_completion_interruptible_timeout(&dev->cmd_complete, > > + msecs_to_jiffies(1000)); > > + > > + if (err < 0) { > > + dev_dbg(dev->dev, "controler is timed out\n"); > > + return -ETIMEDOUT; > > + } > > + if (!dev->cmd_err && (msg->flags & I2C_M_RD)) > > + memcpy(msg->buf, dev->bufv + 1, msg->len); > > + > > + dev_dbg(dev->dev, "done with err=%d\n", dev->cmd_err); > > + > > + return dev->cmd_err; > > +} > > + > > + > > +static int > > +stmp378x_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) > > +{ > > + int i; > > + int err; > > + > > + if (!msgs->len) > > + return -EINVAL; > > + > > + for (i = 0; i < num; i++) { > > + err = stmp378x_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1))); > > + if (err) > > + return err; > > + } > > + return num; > > +} > > + > > +static u32 > > +stmp378x_i2c_func(struct i2c_adapter *adap) > > +{ > > + return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK); > > +} > > + > > +#define I2C_IRQ_MASK 0x000000FF > > +static irqreturn_t > > +stmp378x_i2c_isr(int this_irq, void *dev_id) > > +{ > > + struct stmp378x_i2c_dev *dev = dev_id; > > + u32 stat; > > + u32 done_mask = BM_I2C_CTRL1_DATA_ENGINE_CMPLT_IRQ | > > + BM_I2C_CTRL1_BUS_FREE_IRQ ; > > + > > + stat = readl(HW_I2C_CTRL1 + dev->io) & I2C_IRQ_MASK; > > + if (!stat) > > + return IRQ_NONE; > > + > > + if (stat & BM_I2C_CTRL1_NO_SLAVE_ACK_IRQ) { > > + dev->cmd_err = -EREMOTEIO; > > + > > + /* > > + * Stop DMA > > + * Clear NAK > > + */ > > + stmp3xxx_setl(BM_I2C_CTRL1_CLR_GOT_A_NAK, > > + HW_I2C_CTRL1 + dev->io); > > + stmp3xxx_dma_reset_channel(dev->dma); > > + stmp3xxx_dma_clear_interrupt(dev->dma); > > + > > + complete(&dev->cmd_complete); > > + > > + goto done; > > + } > > + > > + /* Don't care about BM_I2C_CTRL1_OVERSIZE_XFER_TERM_IRQ */ > > + if (stat & (BM_I2C_CTRL1_EARLY_TERM_IRQ | > > + BM_I2C_CTRL1_MASTER_LOSS_IRQ | > > + BM_I2C_CTRL1_SLAVE_STOP_IRQ | > > + BM_I2C_CTRL1_SLAVE_IRQ)) { > > + dev->cmd_err = -EIO; > > + complete(&dev->cmd_complete); > > + goto done; > > + } > > + > > + if ((stat & done_mask) == done_mask) > > + complete(&dev->cmd_complete); > > + > > +done: > > + stmp3xxx_clearl(stat, dev->io + HW_I2C_CTRL1); > > + return IRQ_HANDLED; > > +} > > + > > +static const struct i2c_algorithm stmp378x_i2c_algo = { > > + .master_xfer = stmp378x_i2c_xfer, > > + .functionality = stmp378x_i2c_func, > > +}; > > + > > + > > +static int __devinit > > +stmp378x_i2c_probe(struct platform_device *pdev) > > +{ > > + struct stmp378x_i2c_dev *dev; > > + struct i2c_adapter *adap; > > + struct resource *mem, *dma; > > + int err = 0; > > + > > + dev = kzalloc(sizeof(struct stmp378x_i2c_dev), GFP_KERNEL); > > + if (!dev) { > > + dev_err(&pdev->dev, "no mem \n"); > > + return -ENOMEM; > > + } > > + > > + dev->irq = platform_get_irq(pdev, 0); /* Error */ > > + if (dev->irq < 0) { > > + dev_err(&pdev->dev, "no err_irq resource\n"); > > + err = dev->irq; > > + goto nores; > > + } > > + > > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > + if (!mem) { > > + dev_err(&pdev->dev, "no memory window\n"); > > + err = -ENODEV; > > + goto nores; > > + } > > + > > + dma = platform_get_resource(pdev, IORESOURCE_DMA, 0); > > + if (!dma) { > > + dev_err(&pdev->dev, "no dma channel\n"); > > + err = -ENODEV; > > + goto nores; > > + } > > + dev->dma = dma->start; > > + > > + dev->dev = &pdev->dev; > > + dev->io = ioremap(mem->start, resource_size(mem)); > > + if (!dev->io) { > > + dev_err(&pdev->dev, "cannot ioremap\n"); > > + err = -ENXIO; > > + goto nores; > > + } > > + > > + err = request_irq(dev->irq, stmp378x_i2c_isr, 0, pdev->name, dev); > > + if (err) { > > + dev_err(&pdev->dev, "Can't get IRQ\n"); > > + goto no_err_irq; > > + } > > + > > + err = stmp378x_i2c_init(dev); > > + if (err) { > > + dev_err(&pdev->dev, "HW Init failed\n"); > > + goto init_failed; > > + } > > + > > + stmp3xxx_setl(0xFF00, dev->io + HW_I2C_CTRL1); > > + > > + adap = &dev->adapter; > > + i2c_set_adapdata(adap, dev); > > + adap->owner = THIS_MODULE; > > + adap->class = I2C_CLASS_TV_DIGITAL; > > + strncpy(adap->name, "378x I2C adapter", sizeof(adap->name)); > > + adap->algo = &stmp378x_i2c_algo; > > + adap->dev.parent = &pdev->dev; > > + > > + adap->nr = pdev->id; > > + err = i2c_add_numbered_adapter(adap); > > + if (err) { > > + dev_err(&pdev->dev, "Failed to add adapter\n"); > > + goto no_i2c_adapter; > > + > > + } > > + > > + return 0; > > + > > +no_i2c_adapter: > > + stmp378x_i2c_release(dev); > > +init_failed: > > + free_irq(dev->irq, dev); > > +no_err_irq: > > + iounmap(dev->io); > > +nores: > > + kfree(dev); > > + return err; > > +} > > + > > +static int __devexit > > +stmp378x_i2c_remove(struct platform_device *pdev) > > +{ > > + struct stmp378x_i2c_dev *dev = platform_get_drvdata(pdev); > > + int res; > > + > > + res = i2c_del_adapter(&dev->adapter); > > + if (res) > > + return -EBUSY; > > + > > + stmp378x_i2c_release(dev); > > + > > + platform_set_drvdata(pdev, NULL); > > + > > + free_irq(dev->irq, dev); > > + iounmap(dev->io); > > + > > + kfree(dev); > > + return 0; > > +} > > + > > +static struct platform_driver stmp378x_i2c_driver = { > > + .probe = stmp378x_i2c_probe, > > + .remove = __devexit_p(stmp378x_i2c_remove), > > + .driver = { > > + .name = "i2c_stmp3xxx", > > + .owner = THIS_MODULE, > > + }, > > +}; > > + > > +static int __init stmp378x_i2c_init_driver(void) > > +{ > > + return platform_driver_register(&stmp378x_i2c_driver); > > +} > > +module_init(stmp378x_i2c_init_driver); > > + > > +static void __exit stmp378x_i2c_exit_driver(void) > > +{ > > + platform_driver_unregister(&stmp378x_i2c_driver); > > +} > > +module_exit(stmp378x_i2c_exit_driver); > > + > > +MODULE_AUTHOR("[email protected]"); > > +MODULE_DESCRIPTION("I2C for Freescale STMP378x"); > > +MODULE_LICENSE("GPL"); > > +MODULE_ALIAS("platform:i2c_stmp3xxx"); > > > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-i2c" in > > the body of a message to [email protected] > > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
