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authorMattias Nilsson <mattias.i.nilsson@stericsson.com>2012-03-08 14:02:05 +0100
committerSamuel Ortiz <sameo@linux.intel.com>2012-03-16 19:45:08 +0100
commit3c3e489831b601e566f6bc47e711f5847fb93dff (patch)
treeed40708984de7a3d5a88f973dbacb646b1122316 /drivers/mfd
parenta982362c1723464fec0414f6460684844f2638f3 (diff)
downloadlinux-3c3e489831b601e566f6bc47e711f5847fb93dff.tar.gz
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/mfd')
-rw-r--r--drivers/mfd/db8500-prcmu.c28
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index a1b3464cdba3..6e5a0a09c41a 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)