allwinner: Use RSB for the PMIC connection on H6
RSB is faster and more efficient, and it has a simpler driver. As long
as the PMIC is returned to I2C mode after use, the rich OS can later use
either bus.
Change-Id: I0c5f32e88a090c8c5cccb81bd24596b301ab9da7
Signed-off-by: Samuel Holland <samuel@sholland.org>
diff --git a/plat/allwinner/sun50i_h6/sunxi_power.c b/plat/allwinner/sun50i_h6/sunxi_power.c
index 443015b..a7865a5 100644
--- a/plat/allwinner/sun50i_h6/sunxi_power.c
+++ b/plat/allwinner/sun50i_h6/sunxi_power.c
@@ -6,20 +6,17 @@
*/
#include <errno.h>
-#include <string.h>
-#include <arch_helpers.h>
#include <common/debug.h>
#include <drivers/allwinner/axp.h>
-#include <drivers/delay_timer.h>
-#include <drivers/mentor/mi2cv.h>
-#include <lib/mmio.h>
+#include <drivers/allwinner/sunxi_rsb.h>
#include <sunxi_def.h>
#include <sunxi_mmap.h>
#include <sunxi_private.h>
-#define AXP805_ADDR 0x36
+#define AXP805_HW_ADDR 0x745
+#define AXP805_RT_ADDR 0x3a
static enum pmic_type {
UNKNOWN,
@@ -28,67 +25,67 @@
int axp_read(uint8_t reg)
{
- uint8_t val;
- int ret;
-
- ret = i2c_write(AXP805_ADDR, 0, 0, ®, 1);
- if (ret == 0)
- ret = i2c_read(AXP805_ADDR, 0, 0, &val, 1);
- if (ret) {
- ERROR("PMIC: Cannot read AXP805 register %02x\n", reg);
- return ret;
- }
-
- return val;
+ return rsb_read(AXP805_RT_ADDR, reg);
}
int axp_write(uint8_t reg, uint8_t val)
{
- int ret;
-
- ret = i2c_write(AXP805_ADDR, reg, 1, &val, 1);
- if (ret)
- ERROR("PMIC: Cannot write AXP805 register %02x\n", reg);
-
- return ret;
+ return rsb_write(AXP805_RT_ADDR, reg, val);
}
-static int axp805_probe(void)
+static int rsb_init(void)
{
int ret;
- /* Switch the AXP805 to master/single-PMIC mode. */
- ret = axp_write(0xff, 0x0);
+ ret = rsb_init_controller();
if (ret)
return ret;
- ret = axp_check_id();
+ /* Switch to the recommended 3 MHz bus clock. */
+ ret = rsb_set_bus_speed(SUNXI_OSC24M_CLK_IN_HZ, 3000000);
if (ret)
return ret;
- return 0;
+ /* Initiate an I2C transaction to switch the PMIC to RSB mode. */
+ ret = rsb_set_device_mode(AXP20X_MODE_RSB << 16 | AXP20X_MODE_REG << 8);
+ if (ret)
+ return ret;
+
+ /* Associate the 8-bit runtime address with the 12-bit bus address. */
+ ret = rsb_assign_runtime_address(AXP805_HW_ADDR, AXP805_RT_ADDR);
+ if (ret)
+ return ret;
+
+ return axp_check_id();
}
int sunxi_pmic_setup(uint16_t socid, const void *fdt)
{
int ret;
- INFO("PMIC: Probing AXP805 on I2C\n");
+ INFO("PMIC: Probing AXP805 on RSB\n");
- ret = sunxi_init_platform_r_twi(SUNXI_SOC_H6, false);
+ ret = sunxi_init_platform_r_twi(socid, true);
if (ret)
return ret;
- /* initialise mi2cv driver */
- i2c_init((void *)SUNXI_R_I2C_BASE);
+ ret = rsb_init();
+ if (ret)
+ return ret;
- ret = axp805_probe();
+ /* Switch the AXP805 to master/single-PMIC mode. */
+ ret = axp_write(0xff, 0x0);
if (ret)
return ret;
pmic = AXP805;
axp_setup_regulators(fdt);
+ /* Switch the PMIC back to I2C mode. */
+ ret = axp_write(AXP20X_MODE_REG, AXP20X_MODE_I2C);
+ if (ret)
+ return ret;
+
return 0;
}
@@ -96,10 +93,9 @@
{
switch (pmic) {
case AXP805:
- /* Re-initialise after rich OS might have used it. */
- sunxi_init_platform_r_twi(SUNXI_SOC_H6, false);
- /* initialise mi2cv driver */
- i2c_init((void *)SUNXI_R_I2C_BASE);
+ /* (Re-)init RSB in case the rich OS has disabled it. */
+ sunxi_init_platform_r_twi(SUNXI_SOC_H6, true);
+ rsb_init();
axp_power_off();
break;
default: