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| author | Mattias Nilsson <mattias.i.nilsson@stericsson.com> | 2012-03-08 14:02:05 +0100 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2012-03-16 19:45:08 +0100 |
| commit | 3c3e489831b601e566f6bc47e711f5847fb93dff (patch) | |
| tree | ed40708984de7a3d5a88f973dbacb646b1122316 /drivers | |
| parent | a982362c1723464fec0414f6460684844f2638f3 (diff) | |
| download | linux-3.10-3c3e489831b601e566f6bc47e711f5847fb93dff.tar.gz linux-3.10-3c3e489831b601e566f6bc47e711f5847fb93dff.tar.bz2 linux-3.10-3c3e489831b601e566f6bc47e711f5847fb93dff.zip | |
mfd: Add a prcmu_abb_write_masked routine to db8500-prcmu
This patch adds driver support for the I2C read-modify-write
service in the U8500 PRCMU firmware.
Signed-off-by: Mattias Nilsson <mattias.i.nilsson@stericsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mfd/db8500-prcmu.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c index a1b3464cdba..6e5a0a09c41 100644 --- a/drivers/mfd/db8500-prcmu.c +++ b/drivers/mfd/db8500-prcmu.c @@ -2332,6 +2332,7 @@ int prcmu_abb_read(u8 slave, u8 reg, u8 *value, u8 size) while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(5)) cpu_relax(); + writeb(0, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB5)); writeb(PRCMU_I2C_READ(slave), (tcdm_base + PRCM_REQ_MB5_I2C_SLAVE_OP)); writeb(PRCMU_I2C_STOP_EN, (tcdm_base + PRCM_REQ_MB5_I2C_HW_BITS)); writeb(reg, (tcdm_base + PRCM_REQ_MB5_I2C_REG)); @@ -2357,16 +2358,19 @@ int prcmu_abb_read(u8 slave, u8 reg, u8 *value, u8 size) } /** - * prcmu_abb_write() - Write register value(s) to the ABB. + * prcmu_abb_write_masked() - Write masked register value(s) to the ABB. * @slave: The I2C slave address. * @reg: The (start) register address. * @value: The value(s) to write. + * @mask: The mask(s) to use. * @size: The number of registers to write. * - * Reads register value(s) from the ABB. + * Writes masked register value(s) to the ABB. + * For each @value, only the bits set to 1 in the corresponding @mask + * will be written. The other bits are not changed. * @size has to be 1 for the current firmware version. */ -int prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size) +int prcmu_abb_write_masked(u8 slave, u8 reg, u8 *value, u8 *mask, u8 size) { int r; @@ -2378,6 +2382,7 @@ int prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size) while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(5)) cpu_relax(); + writeb(~*mask, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB5)); writeb(PRCMU_I2C_WRITE(slave), (tcdm_base + PRCM_REQ_MB5_I2C_SLAVE_OP)); writeb(PRCMU_I2C_STOP_EN, (tcdm_base + PRCM_REQ_MB5_I2C_HW_BITS)); writeb(reg, (tcdm_base + PRCM_REQ_MB5_I2C_REG)); @@ -2400,6 +2405,23 @@ int prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size) } /** + * prcmu_abb_write() - Write register value(s) to the ABB. + * @slave: The I2C slave address. + * @reg: The (start) register address. + * @value: The value(s) to write. + * @size: The number of registers to write. + * + * Writes register value(s) to the ABB. + * @size has to be 1 for the current firmware version. + */ +int prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size) +{ + u8 mask = ~0; + + return prcmu_abb_write_masked(slave, reg, value, &mask, size); +} + +/** * prcmu_ac_wake_req - should be called whenever ARM wants to wakeup Modem */ void prcmu_ac_wake_req(void) |