diff options
author | Paul Walmsley <paul@pwsan.com> | 2008-11-21 22:39:55 +0100 |
---|---|---|
committer | Tony Lindgren <tony@atomide.com> | 2008-11-21 22:39:55 +0100 |
commit | 9c76b878eb3f837ff98b37aa254e6cc7942e946b (patch) | |
tree | be127e8a3d0cb5bd5fd6e4f937f350093c50412a /drivers/i2c | |
parent | i2c-omap: fix I2C timeouts due to recursive omap_i2c_{un,}idle() (diff) | |
download | linux-9c76b878eb3f837ff98b37aa254e6cc7942e946b.tar.xz linux-9c76b878eb3f837ff98b37aa254e6cc7942e946b.zip |
i2c-omap: convert 'rev1' flag to generic 'rev' u8
i2c-omap discriminates only between "revision 1" or "greater than
revision 1." A following patch introduces code that must also
discriminate between rev2.x, rev3.6, and rev3.12 controllers. Support
this by storing the full revision data from the I2C_REV register, rather
than just a single bit.
The revision definitions may need to be extended for other ES levels
that aren't currently available here. rev3.6 is what's present on the
2430SDP here (unknown ES revision); rev3.12 is used on the 3430ES2
here.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'drivers/i2c')
-rw-r--r-- | drivers/i2c/busses/i2c-omap.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 40a1e4bc92f1..3ac510d9c9ba 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -38,6 +38,13 @@ #include <linux/clk.h> #include <linux/io.h> +/* I2C controller revisions */ +#define OMAP_I2C_REV_2 0x20 + +/* I2C controller revisions present on specific hardware */ +#define OMAP_I2C_REV_ON_2430 0x36 +#define OMAP_I2C_REV_ON_3430 0x3C + /* timeout waiting for the controller to respond */ #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000)) @@ -139,7 +146,7 @@ struct omap_i2c_dev { * fifo_size==0 implies no fifo * if set, should be trsh+1 */ - unsigned rev1:1; + u8 rev; unsigned b_hw:1; /* bad h/w fixes */ unsigned idle:1; u16 iestate; /* Saved interrupt register */ @@ -209,7 +216,7 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev) dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0); - if (dev->rev1) { + if (dev->rev < OMAP_I2C_REV_2) { iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */ } else { omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate); @@ -231,7 +238,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) unsigned long timeout; unsigned long internal_clk = 0; - if (!dev->rev1) { + if (dev->rev >= OMAP_I2C_REV_2) { omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST); /* For some reason we need to set the EN bit before the * reset done bit gets set. */ @@ -710,6 +717,7 @@ omap_i2c_probe(struct platform_device *pdev) struct omap_i2c_dev *dev; struct i2c_adapter *adap; struct resource *mem, *irq, *ioarea; + void *isr; int r; u32 speed = 0; @@ -760,8 +768,7 @@ omap_i2c_probe(struct platform_device *pdev) omap_i2c_unidle(dev); - if (cpu_is_omap15xx()) - dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20; + dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff; if (cpu_is_omap2430() || cpu_is_omap34xx()) { u16 s; @@ -782,16 +789,16 @@ omap_i2c_probe(struct platform_device *pdev) /* reset ASAP, clearing any IRQs */ omap_i2c_init(dev); - r = request_irq(dev->irq, dev->rev1 ? omap_i2c_rev1_isr : omap_i2c_isr, - 0, pdev->name, dev); + isr = (dev->rev < OMAP_I2C_REV_2) ? omap_i2c_rev1_isr : omap_i2c_isr; + r = request_irq(dev->irq, isr, 0, pdev->name, dev); if (r) { dev_err(dev->dev, "failure requesting irq %i\n", dev->irq); goto err_unuse_clocks; } - r = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff; + dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n", - pdev->id, r >> 4, r & 0xf, dev->speed); + pdev->id, dev->rev >> 4, dev->rev & 0xf, dev->speed); omap_i2c_idle(dev); |