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rockchip: px30: switch VCCIO6 voltage controlled by io_vsel6 

According to the description of GRF_IO_VSEL, the voltage of
VCCIO6(which is the concern of emmc/flash/sfc controller) will
indicate by GPIO0_B6 or io_vsel6. The SOC defaults use GPIO0_B6
to indicate power supply voltage for VCCIO6 by hardware, then
we can switch to io_vsel6 after system power on, and release
GPIO0_B6 for other usage.

Change-Id: I9c8339e357a7328d9ffeb711ba5d0bdd41971101
Signed-off-by: Liang Chen <cl@rock-chips.com>
This commit is contained in:
Liang Chen 2020-06-17 16:28:54 +08:00
parent cd1c982e9a
commit a96802b209
1 changed files with 48 additions and 0 deletions
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48
arch/arm/mach-rockchip/px30/px30.c
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@ -142,6 +142,52 @@ enum {
GPIO3A1_GPIO = 0,
GPIO3A1_UART5_RX = 4,
};
enum {
IOVSEL6_CTRL_SHIFT = 0,
IOVSEL6_CTRL_MASK = BIT(0),
VCCIO6_SEL_BY_GPIO = 0,
VCCIO6_SEL_BY_IOVSEL6,
IOVSEL6_SHIFT = 1,
IOVSEL6_MASK = BIT(1),
VCCIO6_3V3 = 0,
VCCIO6_1V8,
};
/*
* The voltage of VCCIO6(which is the voltage domain of emmc/flash/sfc
* interface) can indicated by GPIO0_B6 or io_vsel6. The SOC defaults
* use GPIO0_B6 to indicate power supply voltage for VCCIO6 by hardware,
* then we can switch to io_vsel6 after system power on, and release GPIO0_B6
* for other usage.
*/
#define GPIO0_B6 14
#define GPIO0_BASE 0xff040000
#define GPIO_SWPORTA_DDR 0x4
#define GPIO_EXT_PORTA 0x50
static int grf_vccio6_vsel_init(void)
{
static struct px30_grf * const grf = (void *)GRF_BASE;
u32 val;
val = readl(GPIO0_BASE + GPIO_SWPORTA_DDR);
val &= ~BIT(GPIO0_B6);
writel(val, GPIO0_BASE + GPIO_SWPORTA_DDR);
if (readl(GPIO0_BASE + GPIO_EXT_PORTA) & BIT(GPIO0_B6))
val = VCCIO6_SEL_BY_IOVSEL6 << IOVSEL6_CTRL_SHIFT |
VCCIO6_1V8 << IOVSEL6_SHIFT;
else
val = VCCIO6_SEL_BY_IOVSEL6 << IOVSEL6_CTRL_SHIFT |
VCCIO6_3V3 << IOVSEL6_SHIFT;
rk_clrsetreg(&grf->io_vsel, IOVSEL6_CTRL_MASK | IOVSEL6_MASK, val);
return 0;
}
int arch_cpu_init(void)
{
#ifdef CONFIG_SPL_BUILD
@ -185,6 +231,8 @@ int arch_cpu_init(void)
/* Clear the force_jtag */
rk_clrreg(GRF_CPU_CON1, 1 << 7);
grf_vccio6_vsel_init();
return 0;
}