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/*
* Copyright (c) 2013 Xilinx Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <malloc.h>
#include <asm/arch/hardware.h>
#include <asm/arch/sys_proto.h>
#define SLCR_LOCK_MAGIC 0x767B
#define SLCR_UNLOCK_MAGIC 0xDF0D
#define SLCR_NAND_L2_SEL 0x10
#define SLCR_NAND_L2_SEL_MASK 0x1F
#define SLCR_USB_L1_SEL 0x04
#define SLCR_IDCODE_MASK 0x1F000
#define SLCR_IDCODE_SHIFT 12
/*
* zynq_slcr_mio_get_status - Get the status of MIO peripheral.
*
* @peri_name: Name of the peripheral for checking MIO status
* @get_pins: Pointer to array of get pin for this peripheral
* @num_pins: Number of pins for this peripheral
* @mask: Mask value
* @check_val: Required check value to get the status of periph
*/
struct zynq_slcr_mio_get_status {
const char *peri_name;
const int *get_pins;
int num_pins;
u32 mask;
u32 check_val;
};
static const int nand8_pins[] = {
0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
};
static const int nand16_pins[] = {
16, 17, 18, 19, 20, 21, 22, 23
};
static const int usb0_pins[] = {
28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39
};
static const int usb1_pins[] = {
40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
};
static const struct zynq_slcr_mio_get_status mio_periphs[] = {
{
"nand8",
nand8_pins,
ARRAY_SIZE(nand8_pins),
SLCR_NAND_L2_SEL_MASK,
SLCR_NAND_L2_SEL,
},
{
"nand16",
nand16_pins,
ARRAY_SIZE(nand16_pins),
SLCR_NAND_L2_SEL_MASK,
SLCR_NAND_L2_SEL,
},
{
"usb0",
usb0_pins,
ARRAY_SIZE(usb0_pins),
SLCR_USB_L1_SEL,
SLCR_USB_L1_SEL,
},
{
"usb1",
usb1_pins,
ARRAY_SIZE(usb1_pins),
SLCR_USB_L1_SEL,
SLCR_USB_L1_SEL,
},
};
static int slcr_lock = 1; /* 1 means locked, 0 means unlocked */
void zynq_slcr_lock(void)
{
if (!slcr_lock) {
writel(SLCR_LOCK_MAGIC, &slcr_base->slcr_lock);
slcr_lock = 1;
}
}
void zynq_slcr_unlock(void)
{
if (slcr_lock) {
writel(SLCR_UNLOCK_MAGIC, &slcr_base->slcr_unlock);
slcr_lock = 0;
}
}
/* Reset the entire system */
void zynq_slcr_cpu_reset(void)
{
/*
* Unlock the SLCR then reset the system.
* Note that this seems to require raw i/o
* functions or there's a lockup?
*/
zynq_slcr_unlock();
/*
* Clear 0x0F000000 bits of reboot status register to workaround
* the FSBL not loading the bitstream after soft-reboot
* This is a temporary solution until we know more.
*/
clrbits_le32(&slcr_base->reboot_status, 0xF000000);
writel(1, &slcr_base->pss_rst_ctrl);
}
void zynq_slcr_devcfg_disable(void)
{
u32 reg_val;
zynq_slcr_unlock();
/* Disable AXI interface by asserting FPGA resets */
writel(0xF, &slcr_base->fpga_rst_ctrl);
/* Disable Level shifters before setting PS-PL */
reg_val = readl(&slcr_base->lvl_shftr_en);
reg_val &= ~0xF;
writel(reg_val, &slcr_base->lvl_shftr_en);
/* Set Level Shifters DT618760 */
writel(0xA, &slcr_base->lvl_shftr_en);
zynq_slcr_lock();
}
void zynq_slcr_devcfg_enable(void)
{
zynq_slcr_unlock();
/* Set Level Shifters DT618760 */
writel(0xF, &slcr_base->lvl_shftr_en);
/* Enable AXI interface by de-asserting FPGA resets */
writel(0x0, &slcr_base->fpga_rst_ctrl);
zynq_slcr_lock();
}
u32 zynq_slcr_get_boot_mode(void)
{
/* Get the bootmode register value */
return readl(&slcr_base->boot_mode);
}
u32 zynq_slcr_get_idcode(void)
{
return (readl(&slcr_base->pss_idcode) & SLCR_IDCODE_MASK) >>
SLCR_IDCODE_SHIFT;
}
/*
* zynq_slcr_get_mio_pin_status - Get the MIO pin status of peripheral.
*
* @periph: Name of the peripheral
*
* Returns count to indicate the number of pins configured for the
* given @periph.
*/
int zynq_slcr_get_mio_pin_status(const char *periph)
{
const struct zynq_slcr_mio_get_status *mio_ptr;
int val, j;
int mio = 0;
u32 i;
for (i = 0; i < ARRAY_SIZE(mio_periphs); i++) {
if (strcmp(periph, mio_periphs[i].peri_name) == 0) {
mio_ptr = &mio_periphs[i];
for (j = 0; j < mio_ptr->num_pins; j++) {
val = readl(&slcr_base->mio_pin
[mio_ptr->get_pins[j]]);
if ((val & mio_ptr->mask) == mio_ptr->check_val)
mio++;
}
break;
}
}
return mio;
}
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