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authorMichael Hennerich <michael.hennerich@analog.com>2008-07-27 10:41:54 +0400
committerBen Dooks <ben-linux@fluff.org>2008-07-28 15:41:03 +0400
commit958585f58f675a3c2855c7d91b6fdd2875552d0b (patch)
tree02c8f69429c9efce17e88515a3c2fef83c0452cd /drivers/i2c
parent31321b76e1a2c70f4eb4c0e19f9f860dcd0ef2ce (diff)
downloadlinux-958585f58f675a3c2855c7d91b6fdd2875552d0b.tar.xz
i2c: Blackfin I2C Driver: Functional power management support
PM_SUSPEND_MEM: Blackfin does not maintain register state through Hibernate. Save and restore peripheral base initialization during PM transitions. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-bfin-twi.c35
1 files changed, 24 insertions, 11 deletions
diff --git a/drivers/i2c/busses/i2c-bfin-twi.c b/drivers/i2c/busses/i2c-bfin-twi.c
index 48d084bdf7c8..3c855ff2992f 100644
--- a/drivers/i2c/busses/i2c-bfin-twi.c
+++ b/drivers/i2c/busses/i2c-bfin-twi.c
@@ -49,6 +49,8 @@ struct bfin_twi_iface {
struct i2c_msg *pmsg;
int msg_num;
int cur_msg;
+ u16 saved_clkdiv;
+ u16 saved_control;
void __iomem *regs_base;
};
@@ -565,32 +567,43 @@ static u32 bfin_twi_functionality(struct i2c_adapter *adap)
I2C_FUNC_I2C;
}
-
static struct i2c_algorithm bfin_twi_algorithm = {
.master_xfer = bfin_twi_master_xfer,
.smbus_xfer = bfin_twi_smbus_xfer,
.functionality = bfin_twi_functionality,
};
-
-static int i2c_bfin_twi_suspend(struct platform_device *dev, pm_message_t state)
+static int i2c_bfin_twi_suspend(struct platform_device *pdev, pm_message_t state)
{
- struct bfin_twi_iface *iface = platform_get_drvdata(dev);
+ struct bfin_twi_iface *iface = platform_get_drvdata(pdev);
+
+ iface->saved_clkdiv = read_CLKDIV(iface);
+ iface->saved_control = read_CONTROL(iface);
+
+ free_irq(iface->irq, iface);
/* Disable TWI */
- write_CONTROL(iface, read_CONTROL(iface) & ~TWI_ENA);
- SSYNC();
+ write_CONTROL(iface, iface->saved_control & ~TWI_ENA);
return 0;
}
-static int i2c_bfin_twi_resume(struct platform_device *dev)
+static int i2c_bfin_twi_resume(struct platform_device *pdev)
{
- struct bfin_twi_iface *iface = platform_get_drvdata(dev);
+ struct bfin_twi_iface *iface = platform_get_drvdata(pdev);
- /* Enable TWI */
- write_CONTROL(iface, read_CONTROL(iface) | TWI_ENA);
- SSYNC();
+ int rc = request_irq(iface->irq, bfin_twi_interrupt_entry,
+ IRQF_DISABLED, pdev->name, iface);
+ if (rc) {
+ dev_err(&pdev->dev, "Can't get IRQ %d !\n", iface->irq);
+ return -ENODEV;
+ }
+
+ /* Resume TWI interface clock as specified */
+ write_CLKDIV(iface, iface->saved_clkdiv);
+
+ /* Resume TWI */
+ write_CONTROL(iface, iface->saved_control);
return 0;
}