On Sat, Dec 05, 2009 at 11:14:08PM -0800, Cory Maccarrone wrote:
> The current i2c-omap driver is set up for 32-bit registers, which
> corresponds to most OMAP devices. However, OMAP730/850 based
> devices use a 16-bit register size.
>
> This change modifies the driver to perform a runtime CPU type check
> to determine the register sizes, and uses a bit shift of either 1
> or 2 bits to compute the proper register sizes for all registers.
>
> Signed-off-by: Cory Maccarrone <darkstar6...@gmail.com>
> ---
> drivers/i2c/busses/i2c-omap.c | 138
> ++++++++++++++++++++++-------------------
> 1 files changed, 73 insertions(+), 65 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index 827da08..dc7cf71 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -49,24 +49,26 @@
> #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
>
> #define OMAP_I2C_REV_REG 0x00
> -#define OMAP_I2C_IE_REG 0x04
> -#define OMAP_I2C_STAT_REG 0x08
> -#define OMAP_I2C_IV_REG 0x0c
> +#define OMAP_I2C_IE_REG 0x01
> +#define OMAP_I2C_STAT_REG 0x02
> +#define OMAP_I2C_IV_REG 0x03
> /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */
> -#define OMAP_I2C_WE_REG 0x0c
> -#define OMAP_I2C_SYSS_REG 0x10
> -#define OMAP_I2C_BUF_REG 0x14
> -#define OMAP_I2C_CNT_REG 0x18
> -#define OMAP_I2C_DATA_REG 0x1c
> -#define OMAP_I2C_SYSC_REG 0x20
> -#define OMAP_I2C_CON_REG 0x24
> -#define OMAP_I2C_OA_REG 0x28
> -#define OMAP_I2C_SA_REG 0x2c
> -#define OMAP_I2C_PSC_REG 0x30
> -#define OMAP_I2C_SCLL_REG 0x34
> -#define OMAP_I2C_SCLH_REG 0x38
> -#define OMAP_I2C_SYSTEST_REG 0x3c
> -#define OMAP_I2C_BUFSTAT_REG 0x40
> +#define OMAP_I2C_WE_REG 0x03
> +#define OMAP_I2C_SYSS_REG 0x04
> +#define OMAP_I2C_BUF_REG 0x05
> +#define OMAP_I2C_CNT_REG 0x06
> +#define OMAP_I2C_DATA_REG 0x07
> +#define OMAP_I2C_SYSC_REG 0x08
> +#define OMAP_I2C_CON_REG 0x09
> +#define OMAP_I2C_OA_REG 0x0a
> +#define OMAP_I2C_SA_REG 0x0b
> +#define OMAP_I2C_PSC_REG 0x0c
> +#define OMAP_I2C_SCLL_REG 0x0d
> +#define OMAP_I2C_SCLH_REG 0x0e
> +#define OMAP_I2C_SYSTEST_REG 0x0f
> +#define OMAP_I2C_BUFSTAT_REG 0x10
> +
> +#define OMAP_I2C_REG(host, reg) (OMAP_I2C_##reg##_REG <<
> (host)->reg_shift)
could you leave the definitions alone and shift the other way?
> /* I2C Interrupt Enable Register (OMAP_I2C_IE): */
> #define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int
> enable */
> @@ -161,6 +163,7 @@ struct omap_i2c_dev {
> struct device *dev;
> void __iomem *base; /* virtual */
> int irq;
> + int reg_shift; /* bit shift for I2C register
> addresses */
> struct clk *iclk; /* Interface clock */
> struct clk *fclk; /* Functional clock */
> struct completion cmd_complete;
> @@ -232,7 +235,7 @@ static void omap_i2c_unidle(struct omap_i2c_dev *dev)
> clk_enable(dev->fclk);
> dev->idle = 0;
> if (dev->iestate)
> - omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, IE), dev->iestate);
how about changing the read and write register calls to do the
necessary address munging so you don't have to change all the
callsites throughout the file?
> }
>
> static void omap_i2c_idle(struct omap_i2c_dev *dev)
> @@ -241,15 +244,15 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev)
>
> WARN_ON(dev->idle);
>
> - dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
> - omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
> + dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, IE));
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, IE), 0);
> if (dev->rev < OMAP_I2C_REV_2) {
> - iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */
> + iv = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, IV)); /* Read
> clears */
> } else {
> - omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, STAT), dev->iestate);
>
> /* Flush posted write before the dev->idle store occurs */
> - omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
> + omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, STAT));
> }
> dev->idle = 1;
> clk_disable(dev->fclk);
> @@ -265,12 +268,12 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
> unsigned long internal_clk = 0;
>
> if (dev->rev >= OMAP_I2C_REV_2) {
> - omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, SYSC),
> SYSC_SOFTRESET_MASK);
> /* For some reason we need to set the EN bit before the
> * reset done bit gets set. */
> timeout = jiffies + OMAP_I2C_TIMEOUT;
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
> - while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) &
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CON),
> OMAP_I2C_CON_EN);
> + while (!(omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, SYSS)) &
> SYSS_RESETDONE_MASK)) {
> if (time_after(jiffies, timeout)) {
> dev_warn(dev->dev, "timeout waiting "
> @@ -283,7 +286,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
> /* SYSC register is cleared by the reset; rewrite it */
> if (dev->rev == OMAP_I2C_REV_ON_2430) {
>
> - omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, SYSC),
> SYSC_AUTOIDLE_MASK);
>
> } else if (dev->rev >= OMAP_I2C_REV_ON_3430) {
> @@ -296,18 +299,18 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
> v |= (SYSC_CLOCKACTIVITY_FCLK <<
> __ffs(SYSC_CLOCKACTIVITY_MASK));
>
> - omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, v);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, SYSC), v);
> /*
> * Enabling all wakup sources to stop I2C freezing on
> * WFI instruction.
> * REVISIT: Some wkup sources might not be needed.
> */
> - omap_i2c_write_reg(dev, OMAP_I2C_WE_REG,
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, WE),
> OMAP_I2C_WE_ALL);
>
> }
> }
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CON), 0);
>
> if (cpu_class_is_omap1()) {
> /*
> @@ -388,25 +391,25 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
> }
>
> /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
> - omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, PSC), psc);
>
> /* SCL low and high time values */
> - omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll);
> - omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, SCLL), scll);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, SCLH), sclh);
>
> if (dev->fifo_size)
> /* Note: setup required fifo size - 1 */
> - omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG,
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, BUF),
> (dev->fifo_size - 1) << 8 | /* RTRSH */
> OMAP_I2C_BUF_RXFIF_CLR |
> (dev->fifo_size - 1) | /* XTRSH */
> OMAP_I2C_BUF_TXFIF_CLR);
>
> /* Take the I2C module out of reset: */
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CON), OMAP_I2C_CON_EN);
>
> /* Enable interrupts */
> - omap_i2c_write_reg(dev, OMAP_I2C_IE_REG,
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, IE),
> (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
> OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
> OMAP_I2C_IE_AL) | ((dev->fifo_size) ?
> @@ -422,7 +425,7 @@ static int omap_i2c_wait_for_bb(struct omap_i2c_dev *dev)
> unsigned long timeout;
>
> timeout = jiffies + OMAP_I2C_TIMEOUT;
> - while (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) & OMAP_I2C_STAT_BB) {
> + while (omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, STAT)) &
> OMAP_I2C_STAT_BB) {
> if (time_after(jiffies, timeout)) {
> dev_warn(dev->dev, "timeout waiting for bus ready\n");
> return -ETIMEDOUT;
> @@ -449,18 +452,18 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
> if (msg->len == 0)
> return -EINVAL;
>
> - omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, SA), msg->addr);
>
> /* REVISIT: Could the STB bit of I2C_CON be used with probing? */
> dev->buf = msg->buf;
> dev->buf_len = msg->len;
>
> - omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CNT), dev->buf_len);
>
> /* Clear the FIFO Buffers */
> - w = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG);
> + w = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, BUF));
> w |= OMAP_I2C_BUF_RXFIF_CLR | OMAP_I2C_BUF_TXFIF_CLR;
> - omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, w);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, BUF), w);
>
> init_completion(&dev->cmd_complete);
> dev->cmd_err = 0;
> @@ -479,16 +482,16 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
> if (!dev->b_hw && stop)
> w |= OMAP_I2C_CON_STP;
>
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CON), w);
>
> /*
> * Don't write stt and stp together on some hardware.
> */
> if (dev->b_hw && stop) {
> unsigned long delay = jiffies + OMAP_I2C_TIMEOUT;
> - u16 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
> + u16 con = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, CON));
> while (con & OMAP_I2C_CON_STT) {
> - con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
> + con = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, CON));
>
> /* Let the user know if i2c is in a bad state */
> if (time_after(jiffies, delay)) {
> @@ -501,7 +504,7 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
>
> w |= OMAP_I2C_CON_STP;
> w &= ~OMAP_I2C_CON_STT;
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CON), w);
> }
>
> /*
> @@ -533,9 +536,9 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
> if (msg->flags & I2C_M_IGNORE_NAK)
> return 0;
> if (stop) {
> - w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
> + w = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, CON));
> w |= OMAP_I2C_CON_STP;
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CON), w);
> }
> return -EREMOTEIO;
> }
> @@ -589,7 +592,7 @@ omap_i2c_complete_cmd(struct omap_i2c_dev *dev, u16 err)
> static inline void
> omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat)
> {
> - omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, STAT), stat);
> }
>
> /* rev1 devices are apparently only on some 15xx */
> @@ -604,7 +607,7 @@ omap_i2c_rev1_isr(int this_irq, void *dev_id)
> if (dev->idle)
> return IRQ_NONE;
>
> - iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG);
> + iv = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, IV));
> switch (iv) {
> case 0x00: /* None */
> break;
> @@ -614,14 +617,14 @@ omap_i2c_rev1_isr(int this_irq, void *dev_id)
> break;
> case 0x02: /* No acknowledgement */
> omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK);
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CON),
> OMAP_I2C_CON_STP);
> break;
> case 0x03: /* Register access ready */
> omap_i2c_complete_cmd(dev, 0);
> break;
> case 0x04: /* Receive data ready */
> if (dev->buf_len) {
> - w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
> + w = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, DATA));
> *dev->buf++ = w;
> dev->buf_len--;
> if (dev->buf_len) {
> @@ -639,7 +642,7 @@ omap_i2c_rev1_isr(int this_irq, void *dev_id)
> w |= *dev->buf++ << 8;
> dev->buf_len--;
> }
> - omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, DATA), w);
> } else
> dev_err(dev->dev, "XRDY IRQ while no data to send\n");
> break;
> @@ -664,8 +667,8 @@ omap_i2c_isr(int this_irq, void *dev_id)
> if (dev->idle)
> return IRQ_NONE;
>
> - bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
> - while ((stat = (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG))) & bits) {
> + bits = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, IE));
> + while ((stat = (omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, STAT)))) &
> bits) {
> dev_dbg(dev->dev, "IRQ (ISR = 0x%04x)\n", stat);
> if (count++ == 100) {
> dev_warn(dev->dev, "Too much work in one IRQ\n");
> @@ -679,13 +682,13 @@ complete:
> * acked after the data operation is complete.
> * Ref: TRM SWPU114Q Figure 18-31
> */
> - omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat &
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, STAT), stat &
> ~(OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
> OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
>
> if (stat & OMAP_I2C_STAT_NACK) {
> err |= OMAP_I2C_STAT_NACK;
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CON),
> OMAP_I2C_CON_STP);
> }
> if (stat & OMAP_I2C_STAT_AL) {
> @@ -707,12 +710,12 @@ complete:
> num_bytes = dev->fifo_size;
> else /* read RXSTAT on RDR interrupt */
> num_bytes = (omap_i2c_read_reg(dev,
> - OMAP_I2C_BUFSTAT_REG)
> + OMAP_I2C_REG(dev,
> BUFSTAT))
> >> 8) & 0x3F;
> }
> while (num_bytes) {
> num_bytes--;
> - w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
> + w = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev,
> DATA));
> if (dev->buf_len) {
> *dev->buf++ = w;
> dev->buf_len--;
> @@ -747,7 +750,7 @@ complete:
> num_bytes = dev->fifo_size;
> else /* read TXSTAT on XDR interrupt */
> num_bytes = omap_i2c_read_reg(dev,
> - OMAP_I2C_BUFSTAT_REG)
> + OMAP_I2C_REG(dev,
> BUFSTAT))
> & 0x3F;
> }
> while (num_bytes) {
> @@ -792,11 +795,11 @@ complete:
> goto complete;
> }
> cpu_relax();
> - stat =
> omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
> + stat =
> omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, STAT));
> }
> }
>
> - omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev,
> DATA), w);
> }
> omap_i2c_ack_stat(dev,
> stat & (OMAP_I2C_STAT_XRDY |
> OMAP_I2C_STAT_XDR));
> @@ -877,13 +880,13 @@ omap_i2c_probe(struct platform_device *pdev)
>
> omap_i2c_unidle(dev);
>
> - dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
> + dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, REV)) & 0xff;
>
> if (cpu_is_omap2430() || cpu_is_omap34xx()) {
> u16 s;
>
> /* Set up the fifo size - Get total size */
> - s = (omap_i2c_read_reg(dev, OMAP_I2C_BUFSTAT_REG) >> 14) & 0x3;
> + s = (omap_i2c_read_reg(dev, OMAP_I2C_REG(dev, BUFSTAT)) >> 14)
> & 0x3;
> dev->fifo_size = 0x8 << s;
>
> /*
> @@ -895,6 +898,11 @@ omap_i2c_probe(struct platform_device *pdev)
> dev->b_hw = 1; /* Enable hardware fixes */
> }
>
> + if (cpu_is_omap7xx())
> + dev->reg_shift = 1;
> + else
> + dev->reg_shift = 2;
> +
> /* reset ASAP, clearing any IRQs */
> omap_i2c_init(dev);
>
> @@ -932,7 +940,7 @@ omap_i2c_probe(struct platform_device *pdev)
> err_free_irq:
> free_irq(dev->irq, dev);
> err_unuse_clocks:
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CON), 0);
> omap_i2c_idle(dev);
> omap_i2c_put_clocks(dev);
> err_iounmap:
> @@ -956,7 +964,7 @@ omap_i2c_remove(struct platform_device *pdev)
>
> free_irq(dev->irq, dev);
> i2c_del_adapter(&dev->adapter);
> - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
> + omap_i2c_write_reg(dev, OMAP_I2C_REG(dev, CON), 0);
> omap_i2c_put_clocks(dev);
> iounmap(dev->base);
> kfree(dev);
> --
> 1.6.3.3
>
> --
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