diff options
| author | Ganesan Ramalingam <ganesanr@broadcom.com> | 2012-07-13 19:14:25 +0530 |
|---|---|---|
| committer | Wolfram Sang <w.sang@pengutronix.de> | 2012-07-14 13:30:25 +0200 |
| commit | 7326e38ffe894d0cd2904704b7d8c53d4a55d752 (patch) | |
| tree | 7261b5bad76ce15dbad07f78a5b5e4b210f6d634 /drivers/i2c | |
| parent | d739a464f3b83cc879a2ba6aec33634c44068531 (diff) | |
| download | linux-7326e38ffe894d0cd2904704b7d8c53d4a55d752.tar.bz2 | |
i2c: i2c-ocores: support for 16bit and 32bit IO
Some architectures supports only 16-bit or 32-bit read/write access to
their IO space. Add a 'reg-io-width' platform and OF parameter which
specifies the IO width to support these platforms.
reg-io-width can be specified as 1, 2 or 4, and has a default value
of 1 if it is unspecified.
Signed-off-by: Ganesan Ramalingam <ganesanr@broadcom.com>
Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-ocores.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c index 9e0709d5fb36..bffd5501ac2d 100644 --- a/drivers/i2c/busses/i2c-ocores.c +++ b/drivers/i2c/busses/i2c-ocores.c @@ -30,6 +30,7 @@ struct ocores_i2c { void __iomem *base; u32 reg_shift; + u32 reg_io_width; wait_queue_head_t wait; struct i2c_adapter adap; struct i2c_msg *msg; @@ -72,12 +73,22 @@ struct ocores_i2c { static inline void oc_setreg(struct ocores_i2c *i2c, int reg, u8 value) { - iowrite8(value, i2c->base + (reg << i2c->reg_shift)); + if (i2c->reg_io_width == 4) + iowrite32(value, i2c->base + (reg << i2c->reg_shift)); + else if (i2c->reg_io_width == 2) + iowrite16(value, i2c->base + (reg << i2c->reg_shift)); + else + iowrite8(value, i2c->base + (reg << i2c->reg_shift)); } static inline u8 oc_getreg(struct ocores_i2c *i2c, int reg) { - return ioread8(i2c->base + (reg << i2c->reg_shift)); + if (i2c->reg_io_width == 4) + return ioread32(i2c->base + (reg << i2c->reg_shift)); + else if (i2c->reg_io_width == 2) + return ioread16(i2c->base + (reg << i2c->reg_shift)); + else + return ioread8(i2c->base + (reg << i2c->reg_shift)); } static void ocores_process(struct ocores_i2c *i2c) @@ -244,6 +255,8 @@ static int ocores_i2c_of_probe(struct platform_device *pdev, } i2c->clock_khz = val / 1000; + of_property_read_u32(pdev->dev.of_node, "reg-io-width", + &i2c->reg_io_width); return 0; } #else @@ -286,6 +299,7 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev) pdata = pdev->dev.platform_data; if (pdata) { i2c->reg_shift = pdata->reg_shift; + i2c->reg_io_width = pdata->reg_io_width; i2c->clock_khz = pdata->clock_khz; } else { ret = ocores_i2c_of_probe(pdev, i2c); @@ -293,6 +307,9 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev) return ret; } + if (i2c->reg_io_width == 0) + i2c->reg_io_width = 1; /* Set to default value */ + ocores_init(i2c); init_waitqueue_head(&i2c->wait); |