/**
* This is really acting as a filter driver, so only the zynq HAL can know if the SDHCI
* controller is enabled.
*
* If it is, we ask the generic SDHCI driver to do its stuff, otherwise we return an error.
**/
static BT_HANDLE zynq_sdhci_probe(const BT_INTEGRATED_DEVICE *pDevice, BT_ERROR *pError) {
BT_ERROR Error;
BT_BOOL bEnabled = BT_FALSE;
volatile ZYNQ_SLCR_REGS *pRegs = bt_ioremap((void *)ZYNQ_SLCR, BT_SIZE_4K);
const BT_RESOURCE *pResource = BT_GetIntegratedResource(pDevice, BT_RESOURCE_ENUM, 0);
if(!pResource) {
goto err_out;
}
switch(pResource->ulStart) {
case 0:
bEnabled = (pRegs->SDIO_CLK_CTRL & ZYNQ_SLCR_CLK_CTRL_CLKACT_0);
if(bEnabled) { // Attempt to reset the device!
zynq_slcr_unlock(pRegs);
pRegs->SDIO_RST_CTRL |= 0x11;
pRegs->SDIO_RST_CTRL &= ~0x11;
zynq_slcr_lock(pRegs);
}
break;
case 1:
bEnabled = (pRegs->SDIO_CLK_CTRL & ZYNQ_SLCR_CLK_CTRL_CLKACT_0);
if(bEnabled) {
zynq_slcr_unlock(pRegs);
pRegs->SDIO_RST_CTRL |= 0x22;
pRegs->SDIO_RST_CTRL &= ~0x22;
zynq_slcr_lock(pRegs);
}
break;
default:
break;
}
bt_iounmap(pRegs);
if(!bEnabled) {
Error = BT_ERR_GENERIC;
goto err_out;
}
BT_INTEGRATED_DRIVER *pDriver = BT_GetIntegratedDriverByName("mmc,sdhci");
if(!pDriver) {
Error = BT_ERR_GENERIC;
goto err_out;
}
return pDriver->pfnProbe(pDevice, pError);
err_out:
if(pError) {
*pError = Error;
}
return NULL;
}
/**
* zynq_early_slcr_init - Early slcr init function
*
* Return: 0 on success, negative errno otherwise.
*
* Called very early during boot from platform code to unlock SLCR.
*/
int __init zynq_early_slcr_init(void)
{
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-slcr");
if (!np) {
pr_err("%s: no slcr node found\n", __func__);
BUG();
}
zynq_slcr_base = of_iomap(np, 0);
if (!zynq_slcr_base) {
pr_err("%s: Unable to map I/O memory\n", __func__);
BUG();
}
np->data = (__force void *)zynq_slcr_base;
/* unlock the SLCR so that registers can be changed */
zynq_slcr_unlock();
pr_info("%s mapped to %p\n", np->name, zynq_slcr_base);
of_node_put(np);
return 0;
}
int arch_cpu_init(void)
{
zynq_slcr_unlock();
#ifndef CONFIG_SPL_BUILD
/* Device config APB, unlock the PCAP */
writel(0x757BDF0D, &devcfg_base->unlock);
writel(0xFFFFFFFF, &devcfg_base->rom_shadow);
#if (CONFIG_SYS_SDRAM_BASE == 0)
/* remap DDR to zero, FILTERSTART */
writel(0, &scu_base->filter_start);
/* OCM_CFG, Mask out the ROM, map ram into upper addresses */
writel(0x1F, &slcr_base->ocm_cfg);
/* FPGA_RST_CTRL, clear resets on AXI fabric ports */
writel(0x0, &slcr_base->fpga_rst_ctrl);
/* Set urgent bits with register */
writel(0x0, &slcr_base->ddr_urgent_sel);
/* Urgent write, ports S2/S3 */
writel(0xC, &slcr_base->ddr_urgent);
#endif
#endif
zynq_clk_early_init();
zynq_slcr_lock();
return 0;
}
/* Setup clk for network */
void zynq_slcr_gem_clk_setup(u32 gem_id, unsigned long clk_rate)
{
int ret;
zynq_slcr_unlock();
if (gem_id > 1) {
printf("Non existing GEM id %d\n", gem_id);
goto out;
}
ret = zynq_clk_set_rate(gem0_clk + gem_id, clk_rate);
if (ret)
goto out;
if (gem_id) {
/* Configure GEM_RCLK_CTRL */
writel(1, &slcr_base->gem1_rclk_ctrl);
} else {
/* Configure GEM_RCLK_CTRL */
writel(1, &slcr_base->gem0_rclk_ctrl);
}
udelay(100000);
out:
zynq_slcr_lock();
}
static BT_HANDLE devcfg_probe(const BT_INTEGRATED_DEVICE *pDevice, BT_ERROR *pError) {
BT_ERROR Error;
if(g_bInUse) {
Error = BT_ERR_GENERIC;
goto err_set_out;
}
g_bInUse = BT_TRUE;
BT_HANDLE hDevcfg = BT_CreateHandle(&oHandleInterface, sizeof(struct _BT_OPAQUE_HANDLE), pError);
if(!hDevcfg) {
goto err_set_out;
}
const BT_RESOURCE *pResource = BT_GetIntegratedResource(pDevice, BT_RESOURCE_MEM, 0);
if(!pResource) {
Error = BT_ERR_GENERIC;
goto err_free_out;
}
hDevcfg->pRegs = (volatile ZYNQ_DEVCFG_REGS *) bt_ioremap((void *) pResource->ulStart, sizeof(ZYNQ_DEVCFG_REGS));
hDevcfg->pRegs->UNLOCK = 0x757BDF0D; // Unlock the DEVCFG interface.
hDevcfg->pRegs->INT_STS = 0xFFFFFFFF; // Clear all interrupt status signals.
hDevcfg->pRegs->CTRL |= CTRL_PCFG_PROG_B;
hDevcfg->pRegs->CTRL |= CTRL_PCAP_MODE; // Enable PCAP transfer mode.
hDevcfg->pRegs->CTRL |= CTRL_PCAP_PR; // Select PCAP for reconfiguration, (disables ICAP).
hDevcfg->pRegs->CTRL &= ~CTRL_QUARTER_PCAP_RATE; // Set full bandwidth PCAP loading rate.
hDevcfg->pRegs->MCTRL &= ~MCTRL_PCAP_LPBK; // Ensure internal PCAP looback is disabled.
hDevcfg->pSLCR = (volatile ZYNQ_SLCR_REGS *) bt_ioremap((void *) ZYNQ_SLCR_BASE, sizeof(ZYNQ_SLCR_REGS));
zynq_slcr_unlock(hDevcfg->pSLCR);
zynq_slcr_preload_fpga(hDevcfg->pSLCR);
zynq_slcr_lock(hDevcfg->pSLCR);
devcfg_reset_pl(hDevcfg);
if(pError) {
*pError = BT_ERR_NONE;
}
return hDevcfg;
err_free_out:
BT_DestroyHandle(hDevcfg);
err_set_out:
if(pError) {
*pError = Error;
}
return NULL;
}
int zynq_pll_init(void) {
zynq_slcr_unlock();
/* ARM PLL & Clock config
* 375 cycles needed for pll
* 26 divisor on pll
* enable all ARM clocks
* 2 divisor on ARM clocks
* ARM clock source is ARM PLL
*/
SLCR_REG(ARM_PLL_CFG) = PLL_CFG_LOCK_CNT(375) | PLL_CFG_PLL_CP(2) | PLL_CFG_PLL_RES(12);
SLCR_REG(ARM_PLL_CTRL) = PLL_FDIV(26) | PLL_BYPASS_FORCE | PLL_RESET;
SLCR_REG(ARM_PLL_CTRL) &= ~PLL_RESET;
if (pll_poll(PLL_STATUS_ARM_PLL_LOCK) == -1) {
return -1;
}
SLCR_REG(ARM_PLL_CTRL) &= ~PLL_BYPASS_FORCE;
SLCR_REG(ARM_CLK_CTRL) = ARM_CLK_CTRL_DIVISOR(2) | ARM_CLK_CTRL_CPU_6OR4XCLKACT |
ARM_CLK_CTRL_CPU_3OR2XCLKACT | ARM_CLK_CTRL_CPU_2XCLKACT |
ARM_CLK_CTRL_CPU_1XCLKACT |ARM_CLK_CTRL_PERI_CLKACT;
/* DDR PLL & Clock config
* 475 cycles needed
* 21 divisor on PLL
* enable all DDR clocks
* 2 divisor for 3XCLK, 3 divisor for 2XCLK
*/
SLCR_REG(DDR_PLL_CFG) = PLL_CFG_LOCK_CNT(475) | PLL_CFG_PLL_CP(2) | PLL_CFG_PLL_RES(12);
SLCR_REG(DDR_PLL_CTRL) = PLL_FDIV(26) | PLL_BYPASS_FORCE | PLL_RESET;
SLCR_REG(DDR_PLL_CTRL) &= ~PLL_RESET;
if (pll_poll(PLL_STATUS_DDR_PLL_LOCK) == -1) {
return -1;
}
SLCR_REG(DDR_PLL_CTRL) &= ~PLL_BYPASS_FORCE;
SLCR_REG(DDR_CLK_CTRL) = DDR_CLK_CTRL_DDR_3XCLKACT | DDR_CLK_CTRL_DDR_2XCLKACT |
DDR_CLK_CTRL_DDR_3XCLK_DIV(2) | DDR_CLK_CTRL_DDR_2XCLK_DIV(3);
/* IO PLL config
* 500 cycles needed for pll
* 20 divisor
*/
SLCR_REG(IO_PLL_CFG) = PLL_CFG_LOCK_CNT(500) | PLL_CFG_PLL_CP(2) | PLL_CFG_PLL_RES(12);
SLCR_REG(IO_PLL_CTRL) = PLL_FDIV(20) | PLL_BYPASS_FORCE | PLL_RESET;
SLCR_REG(IO_PLL_CTRL) &= ~PLL_RESET;
if (pll_poll(PLL_STATUS_IO_PLL_LOCK) == -1) {
return -1;
}
SLCR_REG(IO_PLL_CTRL) &= ~PLL_BYPASS_FORCE;
zynq_slcr_lock();
return 0;
}
void zynq_cpu_stop(cyg_uint32 cpu) {
cyg_uint32 reg;
zynq_slcr_unlock();
reg = zynq_slcr_read(XSLCR_A9_CPU_RST_CTRL_OFFSET);
reg |= (XSLCR_A9_CPU_STOP | XSLCR_A9_CPU_RST) << cpu;
zynq_slcr_write(XSLCR_A9_CPU_RST_CTRL_OFFSET, reg);
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();
}
void zynq_slcr_devcfg_enable(void)
{
zynq_slcr_unlock();
/* Set Level Shifters DT618760 */
writel(0xF, &slcr_base->lvl_shftr_en);
/* Disable AXI interface */
writel(0x0, &slcr_base->fpga_rst_ctrl);
zynq_slcr_lock();
}
static void zynq_cpu_start(cyg_uint32 cpu) {
cyg_uint32 reg;
zynq_slcr_unlock();
reg = zynq_slcr_read(XSLCR_A9_CPU_RST_CTRL_OFFSET);
reg &= ~(XSLCR_A9_CPU_RST << cpu);
zynq_slcr_write(XSLCR_A9_CPU_RST_CTRL_OFFSET, reg);
reg &= ~(XSLCR_A9_CPU_STOP << cpu);
zynq_slcr_write(XSLCR_A9_CPU_RST_CTRL_OFFSET, reg);
zynq_slcr_lock();
}
void platform_early_init(void)
{
zynq_mio_init();
zynq_pll_init();
zynq_clk_init();
#if ZYNQ_SDRAM_INIT
zynq_ddr_init();
#endif
zynq_slcr_unlock();
/* Enable all level shifters */
SLCR_REG(LVL_SHFTR_EN) = 0xF;
/* FPGA SW reset (not documented, but mandatory) */
SLCR_REG(FPGA_RST_CTRL) = 0x0;
/* zynq manual says this is mandatory for cache init */
*REG32(SLCR_BASE + 0xa1c) = 0x020202;
zynq_slcr_lock();
/* early initialize the uart so we can printf */
uart_init_early();
/* initialize the interrupt controller */
arm_gic_init();
/* initialize the timer block */
arm_cortex_a9_timer_init(CPUPRIV_BASE, zynq_get_arm_timer_freq());
/* add the main memory arena */
#if !ZYNQ_CODE_IN_SDRAM && SDRAM_SIZE != 0
/* In the case of running from SRAM, and we are using SDRAM,
* there is a discontinuity between the end of SRAM (256K) and the start of SDRAM (1MB),
* so intentionally bump the boot-time allocator to start in the base of SDRAM.
*/
extern uintptr_t boot_alloc_start;
extern uintptr_t boot_alloc_end;
boot_alloc_start = KERNEL_BASE + MB;
boot_alloc_end = KERNEL_BASE + MB;
#endif
#if SDRAM_SIZE != 0
pmm_add_arena(&sdram_arena);
#endif
pmm_add_arena(&sram_arena);
}
static BT_ERROR devcfg_cleanup(BT_HANDLE h) {
g_bInUse = BT_FALSE;
while(!(h->pRegs->INT_STS & INT_STS_PCFG_DONE)) {
BT_ThreadYield();
}
zynq_slcr_unlock(h->pSLCR);
zynq_slcr_postload_fpga(h->pSLCR);
zynq_slcr_lock(h->pSLCR);
bt_iounmap(h->pRegs);
bt_iounmap(h->pSLCR);
return BT_ERR_NONE;
}
int zynq_mio_init(void)
{
zynq_slcr_unlock();
/* This DDRIOB configuration applies to both zybo and uzed, but it's possible
* it may not work for all boards in the future. Just something to keep in mind
* with different memory configurations.
*/
#if ZYNQ_SDRAM_INIT
SLCR_REG(GPIOB_CTRL) = GPIOB_CTRL_VREF_EN;
SLCR_REG(DDRIOB_ADDR0) = DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_ADDR1) = DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_DATA0) = DDRIOB_INP_TYPE(1) | DDRIOB_TERM_EN |
DDRIOB_DCI_TYPE(0x3) | DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_DATA1) = DDRIOB_INP_TYPE(1) | DDRIOB_TERM_EN |
DDRIOB_DCI_TYPE(0x3) | DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_DIFF0) = DDRIOB_INP_TYPE(2) | DDRIOB_TERM_EN |
DDRIOB_DCI_TYPE(0x3) | DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_DIFF1) = DDRIOB_INP_TYPE(2) | DDRIOB_TERM_EN |
DDRIOB_DCI_TYPE(0x3) | DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_CLOCK) = DDRIOB_OUTPUT_EN(0x3);
/* These register fields are not documented in the TRM. These
* values represent the defaults generated via the Zynq tools
*/
SLCR_REG(DDRIOB_DRIVE_SLEW_ADDR) = 0x0018C61CU;
SLCR_REG(DDRIOB_DRIVE_SLEW_DATA) = 0x00F9861CU;
SLCR_REG(DDRIOB_DRIVE_SLEW_DIFF) = 0x00F9861CU;
SLCR_REG(DDRIOB_DRIVE_SLEW_CLOCK) = 0x00F9861CU;
SLCR_REG(DDRIOB_DDR_CTRL) = 0x00000E60U;
SLCR_REG(DDRIOB_DCI_CTRL) = 0x00000001U;
SLCR_REG(DDRIOB_DCI_CTRL) |= 0x00000020U;
SLCR_REG(DDRIOB_DCI_CTRL) |= 0x00000823U;
#endif
for (size_t pin = 0; pin < countof(zynq_mio_cfg); pin++) {
if (zynq_mio_cfg[pin] != 0) {
SLCR_REG(MIO_PIN_00 + (pin * sizeof(uint32_t))) = zynq_mio_cfg[pin];
}
}
SLCR_REG(SD0_WP_CD_SEL) = SDIO0_WP_SEL(0x37) | SDIO0_CD_SEL(0x2F);
zynq_slcr_lock();
return 0;
}
static int cmd_zynq(int argc, const cmd_args *argv)
{
if (argc < 2) {
notenoughargs:
printf("not enough arguments\n");
usage:
printf("usage: %s <command>\n", argv[0].str);
printf("\tslcr lock\n");
printf("\tslcr unlock\n");
printf("\tslcr lockstatus\n");
printf("\tmio\n");
printf("\tclocks\n");
return -1;
}
if (!strcmp(argv[1].str, "slcr")) {
if (argc < 3) goto notenoughargs;
bool print_lock_status = false;
if (!strcmp(argv[2].str, "lock")) {
zynq_slcr_lock();
print_lock_status = true;
} else if (!strcmp(argv[2].str, "unlock")) {
zynq_slcr_unlock();
print_lock_status = true;
} else if (print_lock_status || !strcmp(argv[2].str, "lockstatus")) {
printf("%s\n", (SLCR->SLCR_LOCKSTA & 0x1) ? "locked" : "unlocked");
} else {
goto usage;
}
} else if (!strcmp(argv[1].str, "mio")) {
printf("zynq mio:\n");
for (size_t i = 0; i < ZYNQ_MIO_CNT; i++) {
printf("\t%02u: 0x%08x", i, *REG32((uintptr_t)&SLCR->MIO_PIN_00 + (i * 4)));
if (i % 4 == 3 || i == 53) {
putchar('\n');
}
}
} else if (!strcmp(argv[1].str, "clocks")) {
zynq_dump_clocks();
} else {
goto usage;
}
return 0;
}
void zynq_clk_init(void)
{
zynq_slcr_unlock();
SLCR_REG(DCI_CLK_CTRL) = zynq_clk_cfg.dci_clk;
SLCR_REG(GEM0_CLK_CTRL) = zynq_clk_cfg.gem0_clk;
SLCR_REG(GEM0_RCLK_CTRL) = zynq_clk_cfg.gem0_rclk;
SLCR_REG(LQSPI_CLK_CTRL) = zynq_clk_cfg.lqspi_clk;
SLCR_REG(SDIO_CLK_CTRL) = zynq_clk_cfg.sdio_clk;
SLCR_REG(UART_CLK_CTRL) = zynq_clk_cfg.uart_clk;
SLCR_REG(PCAP_CLK_CTRL) = zynq_clk_cfg.pcap_clk;
SLCR_REG(FPGA0_CLK_CTRL) = zynq_clk_cfg.fpga0_clk;
SLCR_REG(FPGA1_CLK_CTRL) = zynq_clk_cfg.fpga1_clk;
SLCR_REG(FPGA2_CLK_CTRL) = zynq_clk_cfg.fpga2_clk;
SLCR_REG(FPGA3_CLK_CTRL) = zynq_clk_cfg.fpga3_clk;
SLCR_REG(APER_CLK_CTRL) = zynq_clk_cfg.aper_clk;
SLCR_REG(CLK_621_TRUE) = zynq_clk_cfg.clk_621_true;
zynq_slcr_lock();
}
/* 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();
}
status_t zynq_set_clock(enum zynq_periph periph, bool enable, enum zynq_clock_source source, uint32_t divisor, uint32_t divisor2)
{
DEBUG_ASSERT(periph < _PERIPH_MAX);
DEBUG_ASSERT(!enable || (divisor > 0 && divisor <= 0x3f));
DEBUG_ASSERT(source < 4);
// get the clock control register base
addr_t clk_reg = periph_clk_ctrl_reg(periph);
DEBUG_ASSERT(clk_reg != 0);
int enable_bitpos = periph_clk_ctrl_enable_bitpos(periph);
zynq_slcr_unlock();
// if we're enabling
if (enable) {
uint32_t ctrl = *REG32(clk_reg);
// set the divisor, divisor2 (if applicable), source, and enable
ctrl = (ctrl & ~(0x3f << 20)) | (divisor2 << 20);
ctrl = (ctrl & ~(0x3f << 8)) | (divisor << 8);
ctrl = (ctrl & ~(0x3 << 4)) | (source << 4);
if (enable_bitpos >= 0)
ctrl |= (1 << enable_bitpos);
*REG32(clk_reg) = ctrl;
} else {
if (enable_bitpos >= 0) {
// disabling
uint32_t ctrl = *REG32(clk_reg);
ctrl &= ~(1 << enable_bitpos);
*REG32(clk_reg) = ctrl;
}
}
zynq_slcr_lock();
return NO_ERROR;
}
/* For each PLL we need to configure the cp / res / lock_cnt and then place the PLL in bypass
* before doing a reset to switch to the new values. Then bypass is removed to switch back to using
* the PLL once its locked.
*/
int zynq_pll_init(void) {
const zynq_pll_cfg_tree_t *cfg = &zynq_pll_cfg;
zynq_slcr_unlock();
SLCR_REG(ARM_PLL_CFG) = PLL_CFG_LOCK_CNT(cfg->arm.lock_cnt) | PLL_CFG_PLL_CP(cfg->arm.cp) |
PLL_CFG_PLL_RES(cfg->arm.res);
SLCR_REG(ARM_PLL_CTRL) = PLL_FDIV(cfg->arm.fdiv) | PLL_BYPASS_FORCE | PLL_RESET;
SLCR_REG(ARM_PLL_CTRL) &= ~PLL_RESET;
if (reg_poll((uintptr_t)&SLCR->PLL_STATUS, PLL_STATUS_ARM_PLL_LOCK) == -1) {
return -1;
}
SLCR_REG(ARM_PLL_CTRL) &= ~PLL_BYPASS_FORCE;
SLCR_REG(ARM_CLK_CTRL) = zynq_clk_cfg.arm_clk;
#if ZYNQ_SDRAM_INIT
SLCR_REG(DDR_PLL_CFG) = PLL_CFG_LOCK_CNT(cfg->ddr.lock_cnt) | PLL_CFG_PLL_CP(cfg->ddr.cp) |
PLL_CFG_PLL_RES(cfg->ddr.res);
SLCR_REG(DDR_PLL_CTRL) = PLL_FDIV(cfg->ddr.fdiv) | PLL_BYPASS_FORCE | PLL_RESET;
SLCR_REG(DDR_PLL_CTRL) &= ~PLL_RESET;
if (reg_poll((uintptr_t)&SLCR->PLL_STATUS, PLL_STATUS_DDR_PLL_LOCK) == -1) {
return -1;
}
SLCR_REG(DDR_PLL_CTRL) &= ~PLL_BYPASS_FORCE;
SLCR_REG(DDR_CLK_CTRL) = zynq_clk_cfg.ddr_clk;
#endif
SLCR_REG(IO_PLL_CFG) = PLL_CFG_LOCK_CNT(cfg->io.lock_cnt) | PLL_CFG_PLL_CP(cfg->io.cp) |
PLL_CFG_PLL_RES(cfg->io.res);
SLCR_REG(IO_PLL_CTRL) = PLL_FDIV(cfg->io.fdiv) | PLL_BYPASS_FORCE | PLL_RESET;
SLCR_REG(IO_PLL_CTRL) &= ~PLL_RESET;
if (reg_poll((uintptr_t)&SLCR->PLL_STATUS, PLL_STATUS_IO_PLL_LOCK) == -1) {
return -1;
}
SLCR_REG(IO_PLL_CTRL) &= ~PLL_BYPASS_FORCE;
zynq_slcr_lock();
return 0;
}
/**
* zynq_slcr_system_reset - Reset the entire system.
*/
void zynq_slcr_system_reset(void)
{
u32 reboot;
/*
* 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.
*/
zynq_slcr_read(&reboot, SLCR_REBOOT_STATUS_OFFSET);
zynq_slcr_write(reboot & 0xF0FFFFFF, SLCR_REBOOT_STATUS_OFFSET);
zynq_slcr_write(1, SLCR_PS_RST_CTRL_OFFSET);
}
void zynq_ddr_init(void)
{
zynq_slcr_unlock();
/* Write addresss / value pairs from target table */
for (size_t i = 0; i < zynq_ddr_cfg_cnt; i += 2) {
*REG32(zynq_ddr_cfg[i]) = zynq_ddr_cfg[i+1];
}
/* Wait for DCI done */
reg_poll((uintptr_t)&SLCR->DDRIOB_DCI_STATUS, 0x2000);
/* Bring ddr out of reset and wait until self refresh */
*REG32(DDRC_CTRL) |= DDRC_CTRL_OUT_OF_RESET;
reg_poll(DDRC_MODE_STATUS, DDRC_STS_SELF_REFRESH);
/* Switch timer to 64k */
*REG32(0XF8007000) = *REG32(0xF8007000) & ~0x20000000U;
zynq_slcr_lock();
}
void zynq_ddr_init(void)
{
zynq_slcr_unlock();
/* Write addresss / value pairs from target table */
for (size_t i = 0; i < zynq_ddr_cfg_cnt; i += 2) {
*REG32(zynq_ddr_cfg[i]) = zynq_ddr_cfg[i+1];
}
/* Wait for DCI done */
reg_poll((uintptr_t)&SLCR->DDRIOB_DCI_STATUS, 0x2000);
/* Bring ddr out of reset and wait until self refresh */
*REG32(0XF8006000) = 0x00000081U;
reg_poll(0xf8006054, 0x00000007);
/* Switch timer to 64k */
*REG32(0XF8007000) = *REG32(0xF8007000) & ~0x20000000U;
zynq_slcr_lock();
}
/* zynq specific halt */
void platform_halt(platform_halt_action suggested_action,
platform_halt_reason reason)
{
switch (suggested_action) {
default:
case HALT_ACTION_SHUTDOWN:
case HALT_ACTION_HALT:
printf("HALT: spinning forever... (reason = %d)\n", reason);
enter_critical_section();
for(;;)
arch_idle();
break;
case HALT_ACTION_REBOOT:
printf("REBOOT\n");
enter_critical_section();
for (;;) {
zynq_slcr_unlock();
SLCR->PSS_RST_CTRL = 1;
}
break;
}
}
/**
* zynq_early_slcr_init - Early slcr init function
*
* Return: 0 on success, negative errno otherwise.
*
* Called very early during boot from platform code to unlock SLCR.
*/
int __init zynq_early_slcr_init(void)
{
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-slcr");
if (!np) {
pr_err("%s: no slcr node found\n", __func__);
BUG();
}
zynq_slcr_base = of_iomap(np, 0);
if (!zynq_slcr_base) {
pr_err("%s: Unable to map I/O memory\n", __func__);
BUG();
}
np->data = (__force void *)zynq_slcr_base;
zynq_slcr_regmap = syscon_regmap_lookup_by_compatible("xlnx,zynq-slcr");
if (IS_ERR(zynq_slcr_regmap)) {
pr_err("%s: failed to find zynq-slcr\n", __func__);
return -ENODEV;
}
/* unlock the SLCR so that registers can be changed */
zynq_slcr_unlock();
/* See AR#54190 design advisory */
regmap_update_bits(zynq_slcr_regmap, SLCR_L2C_RAM, 0x70707, 0x20202);
register_restart_handler(&zynq_slcr_restart_nb);
pr_info("%s mapped to %p\n", np->name, zynq_slcr_base);
of_node_put(np);
return 0;
}
int zynq_clk_init(void)
{
zynq_slcr_unlock();
SLCR_REG(DCI_CLK_CTRL) = CLK_CTRL_CLKACT1 | CLK_CTRL_DIVISOR1(52) | CLK_CTRL_DIVISOR2(2);
SLCR_REG(GEM0_RCLK_CTRL) = CLK_CTRL_CLKACT1;
SLCR_REG(GEM0_CLK_CTRL) = CLK_CTRL_CLKACT1 | CLK_CTRL_DIVISOR1(8) | CLK_CTRL_DIVISOR2(1);
SLCR_REG(LQSPI_CLK_CTRL) = CLK_CTRL_CLKACT1 | CLK_CTRL_DIVISOR1(5);
SLCR_REG(SDIO_CLK_CTRL) = CLK_CTRL_CLKACT1 | CLK_CTRL_DIVISOR1(20);
SLCR_REG(UART_CLK_CTRL) = CLK_CTRL_CLKACT2 | CLK_CTRL_DIVISOR1(20);
SLCR_REG(PCAP_CLK_CTRL) = CLK_CTRL_CLKACT1 | CLK_CTRL_DIVISOR1(5);
SLCR_REG(FPGA0_CLK_CTRL) = CLK_CTRL_DIVISOR1(10) | CLK_CTRL_DIVISOR2(1);
SLCR_REG(FPGA1_CLK_CTRL) = CLK_CTRL_SRCSEL(3) | CLK_CTRL_DIVISOR1(6) | CLK_CTRL_DIVISOR2(1);
SLCR_REG(FPGA2_CLK_CTRL) = CLK_CTRL_SRCSEL(2) | CLK_CTRL_DIVISOR1(53) | CLK_CTRL_DIVISOR2(2);
SLCR_REG(FPGA3_CLK_CTRL) = CLK_CTRL_DIVISOR2(1);
SLCR_REG(CLK_621_TRUE) = CLK_621_ENABLE;
SLCR_REG(APER_CLK_CTRL) = DMA_CPU_CLK_EN | USB0_CPU_CLK_EN | USB1_CPU_CLK_EN |
GEM0_CPU_CLK_EN | SDI0_CPU_CLK_EN | I2C0_CPU_CLK_EN |
I2C1_CPU_CLK_EN | UART1_CPU_CLK_EN | GPIO_CPU_CLK_EN |
LQSPI_CPU_CLK_EN | SMC_CPU_CLK_EN;
zynq_slcr_lock();
return 0;
}
/* Setup clk for network */
void zynq_slcr_gem_clk_setup(u32 gem_id, u32 rclk, u32 clk)
{
zynq_slcr_unlock();
if (gem_id > 1) {
printf("Non existing GEM id %d\n", gem_id);
goto out;
}
if (gem_id) {
/* Set divisors for appropriate frequency in GEM_CLK_CTRL */
writel(clk, &slcr_base->gem1_clk_ctrl);
/* Configure GEM_RCLK_CTRL */
writel(rclk, &slcr_base->gem1_rclk_ctrl);
} else {
/* Set divisors for appropriate frequency in GEM_CLK_CTRL */
writel(clk, &slcr_base->gem0_clk_ctrl);
/* Configure GEM_RCLK_CTRL */
writel(rclk, &slcr_base->gem0_rclk_ctrl);
}
udelay(100000);
out:
zynq_slcr_lock();
}
int zynq_mio_init(void)
{
zynq_slcr_unlock();
SLCR_REG(GPIOB_CTRL) = GPIOB_CTRL_VREF_EN;
SLCR_REG(DDRIOB_ADDR0) = DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_ADDR1) = DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_DATA0) = DDRIOB_INP_TYPE(1) | DDRIOB_TERM_EN |
DDRIOB_DCI_TYPE(0x3) | DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_DATA1) = DDRIOB_INP_TYPE(1) | DDRIOB_TERM_EN |
DDRIOB_DCI_TYPE(0x3) | DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_DIFF0) = DDRIOB_INP_TYPE(2) | DDRIOB_TERM_EN |
DDRIOB_DCI_TYPE(0x3) | DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_DIFF1) = DDRIOB_INP_TYPE(2) | DDRIOB_TERM_EN |
DDRIOB_DCI_TYPE(0x3) | DDRIOB_OUTPUT_EN(0x3);
SLCR_REG(DDRIOB_CLOCK) = DDRIOB_OUTPUT_EN(0x3);
/* These register fields are not documented in the TRM. These
* values represent the defaults generated via the Zynq tools
*/
SLCR_REG(DDRIOB_DRIVE_SLEW_ADDR) = 0x0018C61CU;
SLCR_REG(DDRIOB_DRIVE_SLEW_DATA) = 0x00F9861CU;
SLCR_REG(DDRIOB_DRIVE_SLEW_DIFF) = 0x00F9861CU;
SLCR_REG(DDRIOB_DRIVE_SLEW_CLOCK) = 0x00F9861CU;
SLCR_REG(DDRIOB_DDR_CTRL) = 0x00000E60U;
SLCR_REG(DDRIOB_DCI_CTRL) = 0x00000001U;
SLCR_REG(DDRIOB_DCI_CTRL) |= 0x00000020U;
SLCR_REG(DDRIOB_DCI_CTRL) |= 0x00000823U;
/* mio pin config */
SLCR_REG(MIO_PIN_01) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS33;
SLCR_REG(MIO_PIN_02) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS33;
SLCR_REG(MIO_PIN_03) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS33;
SLCR_REG(MIO_PIN_04) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS33;
SLCR_REG(MIO_PIN_05) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS33;
SLCR_REG(MIO_PIN_06) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS33;
SLCR_REG(MIO_PIN_08) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS33;
SLCR_REG(MIO_PIN_16) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL | MIO_DISABLE_RCVR;
SLCR_REG(MIO_PIN_17) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL | MIO_DISABLE_RCVR;
SLCR_REG(MIO_PIN_18) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL | MIO_DISABLE_RCVR;
SLCR_REG(MIO_PIN_19) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL | MIO_DISABLE_RCVR;
SLCR_REG(MIO_PIN_20) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL | MIO_DISABLE_RCVR;
SLCR_REG(MIO_PIN_21) = MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL | MIO_DISABLE_RCVR;
SLCR_REG(MIO_PIN_22) = MIO_TRI_ENABLE | MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL;
SLCR_REG(MIO_PIN_23) = MIO_TRI_ENABLE | MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL;
SLCR_REG(MIO_PIN_24) = MIO_TRI_ENABLE | MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL;
SLCR_REG(MIO_PIN_25) = MIO_TRI_ENABLE | MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL;
SLCR_REG(MIO_PIN_26) = MIO_TRI_ENABLE | MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL;
SLCR_REG(MIO_PIN_27) = MIO_TRI_ENABLE | MIO_L0_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_HSTL;
SLCR_REG(MIO_PIN_28) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_29) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18 | MIO_TRI_ENABLE;
SLCR_REG(MIO_PIN_30) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_31) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18 | MIO_TRI_ENABLE;
SLCR_REG(MIO_PIN_32) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_33) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_34) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_35) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_36) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18 | MIO_TRI_ENABLE;
SLCR_REG(MIO_PIN_37) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_38) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_39) = MIO_L1_SEL | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_40) = MIO_L3_SEL(0x4) | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_41) = MIO_L3_SEL(0x4) | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_42) = MIO_L3_SEL(0x4) | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_43) = MIO_L3_SEL(0x4) | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_44) = MIO_L3_SEL(0x4) | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_45) = MIO_L3_SEL(0x4) | MIO_SPEED_FAST | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_47) = MIO_TRI_ENABLE | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_48) = MIO_L3_SEL(0x7) | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_49) = MIO_TRI_ENABLE | MIO_L3_SEL(0x7) | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_52) = MIO_L3_SEL(0x4) | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(MIO_PIN_53) = MIO_L3_SEL(0x4) | MIO_IO_TYPE_LVCMOS18;
SLCR_REG(SD0_WP_CD_SEL) = SDIO0_WP_SEL(0x37) | SDIO0_CD_SEL(0x2F);
zynq_slcr_lock();
return 0;
}
void platform_early_init(void)
{
#if 0
ps7_init();
#else
/* Unlock the registers and leave them that way */
zynq_slcr_unlock();
zynq_mio_init();
zynq_pll_init();
zynq_clk_init();
#if ZYNQ_SDRAM_INIT
zynq_ddr_init();
#endif
#endif
/* Enable all level shifters */
SLCR_REG(LVL_SHFTR_EN) = 0xF;
/* FPGA SW reset (not documented, but mandatory) */
SLCR_REG(FPGA_RST_CTRL) = 0x0;
/* zynq manual says this is mandatory for cache init */
*REG32(SLCR_BASE + 0xa1c) = 0x020202;
/* early initialize the uart so we can printf */
uart_init_early();
/* initialize the interrupt controller */
arm_gic_init();
zynq_gpio_init();
/* initialize the timer block */
arm_cortex_a9_timer_init(CPUPRIV_BASE, zynq_get_arm_timer_freq());
/* bump the 2nd cpu into our code space and remap the top SRAM block */
if (KERNEL_LOAD_OFFSET != 0) {
/* construct a trampoline to get the 2nd cpu up to the trap routine */
/* figure out the offset of the trampoline routine in physical space from address 0 */
extern void platform_reset(void);
addr_t tramp = (addr_t)&platform_reset;
tramp -= KERNEL_BASE;
tramp += MEMBASE;
/* stuff in a ldr pc, [nextaddrress], and a target address */
uint32_t *ptr = (uint32_t *)KERNEL_BASE;
ptr[0] = 0xe51ff004; // ldr pc, [pc, #-4]
ptr[1] = tramp;
arch_clean_invalidate_cache_range((addr_t)ptr, 8);
}
/* reset the 2nd cpu, letting it go through its reset vector (at 0x0 physical) */
SLCR_REG(A9_CPU_RST_CTRL) |= (1<<1); // reset cpu 1
spin(10);
SLCR_REG(A9_CPU_RST_CTRL) &= ~(1<<1); // unreset cpu 1
/* wait for the 2nd cpu to reset, go through the usual reset vector, and get trapped by our code */
/* see platform/zynq/reset.S */
extern volatile int __cpu_trapped;
uint count = 100000;
while (--count) {
arch_clean_invalidate_cache_range((addr_t)&__cpu_trapped, sizeof(__cpu_trapped));
if (__cpu_trapped != 0)
break;
}
if (count == 0) {
panic("ZYNQ: failed to trap 2nd cpu\n");
}
/* bounce the 4th sram region down to lower address */
SLCR_REG(OCM_CFG) &= ~0xf; /* all banks at low address */
/* add the main memory arena */
#if !ZYNQ_CODE_IN_SDRAM && SDRAM_SIZE != 0
/* In the case of running from SRAM, and we are using SDRAM,
* there is a discontinuity between the end of SRAM (256K) and the start of SDRAM (1MB),
* so intentionally bump the boot-time allocator to start in the base of SDRAM.
*/
extern uintptr_t boot_alloc_start;
extern uintptr_t boot_alloc_end;
boot_alloc_start = KERNEL_BASE + MB;
boot_alloc_end = KERNEL_BASE + MB;
#endif
#if SDRAM_SIZE != 0
pmm_add_arena(&sdram_arena);
#endif
pmm_add_arena(&sram_arena);
}