diff options
| author | Michael Hennerich <michael.hennerich@analog.com> | 2008-07-27 08:41:54 +0200 |
|---|---|---|
| committer | Ben Dooks <ben-linux@fluff.org> | 2008-07-28 13:41:03 +0200 |
| commit | 958585f58f675a3c2855c7d91b6fdd2875552d0b (patch) | |
| tree | 02c8f69429c9efce17e88515a3c2fef83c0452cd /drivers/i2c/busses/i2c-bfin-twi.c | |
| parent | i2c: Documentation: upgrading clients HOWTO (diff) | |
| download | linux-958585f58f675a3c2855c7d91b6fdd2875552d0b.tar.xz linux-958585f58f675a3c2855c7d91b6fdd2875552d0b.zip | |
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/busses/i2c-bfin-twi.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-bfin-twi.c | 35 |
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; } |