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i2c: ocores: support big-endian register layout

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This allows using OpenCores I2C controller attached to its host in
native-endian mode with bi-endian CPUs. Example of such system is Xtensa
XTFPGA platform.

Acked-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Max Filippov 2015-10-07 02:45:11 +03:00 committed by Wolfram Sang
parent 8a5e3d472e
commit b299167652
2 changed files with 28 additions and 4 deletions
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31
drivers/i2c/busses/i2c-ocores.c
View File

@ -92,6 +92,16 @@ static void oc_setreg_32(struct ocores_i2c *i2c, int reg, u8 value)
iowrite32(value, i2c->base + (reg << i2c->reg_shift));
}
static void oc_setreg_16be(struct ocores_i2c *i2c, int reg, u8 value)
{
iowrite16be(value, i2c->base + (reg << i2c->reg_shift));
}
static void oc_setreg_32be(struct ocores_i2c *i2c, int reg, u8 value)
{
iowrite32be(value, i2c->base + (reg << i2c->reg_shift));
}
static inline u8 oc_getreg_8(struct ocores_i2c *i2c, int reg)
{
return ioread8(i2c->base + (reg << i2c->reg_shift));
@ -107,6 +117,16 @@ static inline u8 oc_getreg_32(struct ocores_i2c *i2c, int reg)
return ioread32(i2c->base + (reg << i2c->reg_shift));
}
static inline u8 oc_getreg_16be(struct ocores_i2c *i2c, int reg)
{
return ioread16be(i2c->base + (reg << i2c->reg_shift));
}
static inline u8 oc_getreg_32be(struct ocores_i2c *i2c, int reg)
{
return ioread32be(i2c->base + (reg << i2c->reg_shift));
}
static inline void oc_setreg(struct ocores_i2c *i2c, int reg, u8 value)
{
i2c->setreg(i2c, reg, value);
@ -428,6 +448,9 @@ static int ocores_i2c_probe(struct platform_device *pdev)
i2c->reg_io_width = 1; /* Set to default value */
if (!i2c->setreg || !i2c->getreg) {
bool be = pdata ? pdata->big_endian :
of_device_is_big_endian(pdev->dev.of_node);
switch (i2c->reg_io_width) {
case 1:
i2c->setreg = oc_setreg_8;
@ -435,13 +458,13 @@ static int ocores_i2c_probe(struct platform_device *pdev)
break;
case 2:
i2c->setreg = oc_setreg_16;
i2c->getreg = oc_getreg_16;
i2c->setreg = be ? oc_setreg_16be : oc_setreg_16;
i2c->getreg = be ? oc_getreg_16be : oc_getreg_16;
break;
case 4:
i2c->setreg = oc_setreg_32;
i2c->getreg = oc_getreg_32;
i2c->setreg = be ? oc_setreg_32be : oc_setreg_32;
i2c->getreg = be ? oc_getreg_32be : oc_getreg_32;
break;
default:

1
include/linux/i2c-ocores.h
View File

@ -15,6 +15,7 @@ struct ocores_i2c_platform_data {
u32 reg_shift; /* register offset shift value */
u32 reg_io_width; /* register io read/write width */
u32 clock_khz; /* input clock in kHz */
bool big_endian; /* registers are big endian */
u8 num_devices; /* number of devices in the devices list */
struct i2c_board_info const *devices; /* devices connected to the bus */
};