From 3312d25e1abdc41be8a75a1b2c3ccaa39a14ed99 Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Wed, 12 Sep 2012 16:28:02 +0530 Subject: [PATCH] i2c: omap: re-factor receive/transmit data loop re-factor the common parts to a separate function, so that code is easier to read and understand. No functional changes. Signed-off-by: Felipe Balbi Signed-off-by: Shubhrajyoti D Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-omap.c | 204 ++++++++++++++-------------------- 1 file changed, 82 insertions(+), 122 deletions(-) diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index fb5722186d95..2c7d7cc30e95 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -752,12 +752,81 @@ static int errata_omap3_i462(struct omap_i2c_dev *dev) return 0; } +static void omap_i2c_receive_data(struct omap_i2c_dev *dev, u8 num_bytes, + bool is_rdr) +{ + u16 w; + + while (num_bytes--) { + if (!dev->buf_len) { + dev_err(dev->dev, "%s without data", + is_rdr ? "RDR" : "RRDY"); + break; + } + + w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); + *dev->buf++ = w; + dev->buf_len--; + + /* + * Data reg in 2430, omap3 and + * omap4 is 8 bit wide + */ + if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { + if (dev->buf_len) { + *dev->buf++ = w >> 8; + dev->buf_len--; + } + } + } +} + +static int omap_i2c_transmit_data(struct omap_i2c_dev *dev, u8 num_bytes, + bool is_xdr) +{ + u16 w; + + while (num_bytes--) { + if (!dev->buf_len) { + dev_err(dev->dev, "%s without data", + is_xdr ? "XDR" : "XRDY"); + break; + } + + w = *dev->buf++; + dev->buf_len--; + + /* + * Data reg in 2430, omap3 and + * omap4 is 8 bit wide + */ + if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { + if (dev->buf_len) { + w |= *dev->buf++ << 8; + dev->buf_len--; + } + } + + if (dev->errata & I2C_OMAP_ERRATA_I462) { + int ret; + + ret = errata_omap3_i462(dev); + if (ret < 0) + return ret; + } + + omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); + } + + return 0; +} + static irqreturn_t omap_i2c_isr(int this_irq, void *dev_id) { struct omap_i2c_dev *dev = dev_id; u16 bits; - u16 stat, w; + u16 stat; int err, count = 0; if (pm_runtime_suspended(dev->dev)) @@ -810,30 +879,7 @@ omap_i2c_isr(int this_irq, void *dev_id) if (dev->fifo_size) num_bytes = dev->buf_len; - while (num_bytes--) { - if (!dev->buf_len) { - dev_err(dev->dev, - "RDR IRQ while no data" - " requested\n"); - break; - } - - w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); - *dev->buf++ = w; - dev->buf_len--; - - /* - * Data reg in 2430, omap3 and - * omap4 is 8 bit wide - */ - if (dev->flags & - OMAP_I2C_FLAG_16BIT_DATA_REG) { - if (dev->buf_len) { - *dev->buf++ = w >> 8; - dev->buf_len--; - } - } - } + omap_i2c_receive_data(dev, num_bytes, true); if (dev->errata & I2C_OMAP_ERRATA_I207) i2c_omap_errata_i207(dev, stat); @@ -848,77 +894,22 @@ omap_i2c_isr(int this_irq, void *dev_id) if (dev->fifo_size) num_bytes = dev->fifo_size; - while (num_bytes--) { - if (!dev->buf_len) { - dev_err(dev->dev, - "RRDY IRQ while no data" - " requested\n"); - break; - } - - w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); - *dev->buf++ = w; - dev->buf_len--; - - /* - * Data reg in 2430, omap3 and - * omap4 is 8 bit wide - */ - if (dev->flags & - OMAP_I2C_FLAG_16BIT_DATA_REG) { - if (dev->buf_len) { - *dev->buf++ = w >> 8; - dev->buf_len--; - } - } - } - + omap_i2c_receive_data(dev, num_bytes, false); omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY); continue; } if (stat & OMAP_I2C_STAT_XDR) { u8 num_bytes = 1; + int ret; if (dev->fifo_size) num_bytes = dev->buf_len; - while (num_bytes--) { - if (!dev->buf_len) { - dev_err(dev->dev, - "XDR IRQ while no " - "data to send\n"); - break; - } - - w = *dev->buf++; - dev->buf_len--; - - /* - * Data reg in 2430, omap3 and - * omap4 is 8 bit wide - */ - if (dev->flags & - OMAP_I2C_FLAG_16BIT_DATA_REG) { - if (dev->buf_len) { - w |= *dev->buf++ << 8; - dev->buf_len--; - } - } - - if (dev->errata & I2C_OMAP_ERRATA_I462) { - int ret; - - ret = errata_omap3_i462(dev); - stat = omap_i2c_read_reg(dev, - OMAP_I2C_STAT_REG); - - if (ret < 0) - goto complete; - } - - omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); - } + ret = omap_i2c_transmit_data(dev, num_bytes, true); + stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); + if (ret < 0) + goto complete; omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XDR); continue; @@ -926,46 +917,15 @@ omap_i2c_isr(int this_irq, void *dev_id) if (stat & OMAP_I2C_STAT_XRDY) { u8 num_bytes = 1; + int ret; if (dev->fifo_size) num_bytes = dev->fifo_size; - while (num_bytes--) { - if (!dev->buf_len) { - dev_err(dev->dev, - "XRDY IRQ while no " - "data to send\n"); - break; - } - - w = *dev->buf++; - dev->buf_len--; - - /* - * Data reg in 2430, omap3 and - * omap4 is 8 bit wide - */ - if (dev->flags & - OMAP_I2C_FLAG_16BIT_DATA_REG) { - if (dev->buf_len) { - w |= *dev->buf++ << 8; - dev->buf_len--; - } - } - - if (dev->errata & I2C_OMAP_ERRATA_I462) { - int ret; - - ret = errata_omap3_i462(dev); - stat = omap_i2c_read_reg(dev, - OMAP_I2C_STAT_REG); - - if (ret < 0) - goto complete; - } - - omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); - } + ret = omap_i2c_transmit_data(dev, num_bytes, false); + stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); + if (ret < 0) + goto complete; omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY); continue;