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arc: emsdp: Read real CPU clock value from hardware

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We do real CPU clock measurement with help of built-in
counters. Thus we may accommodate different real clock values
that appear in different FPA images instead of relying on
something hard-coded in the .dtb.

And while at it make make SDIO base address define
look similar to others with casting to "(void *)".

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
This commit is contained in:
Alexey Brodkin 2018-11-27 09:46:59 +03:00 committed by Alexey Brodkin
parent 7f25b72a78
commit 4e86c7e3cd
1 changed files with 39 additions and 3 deletions
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42
board/synopsys/emsdp/emsdp.c
View File

@ -7,10 +7,46 @@
#include <dwmmc.h>
#include <malloc.h>
#include <asm/arcregs.h>
DECLARE_GLOBAL_DATA_PTR;
#define ARC_PERIPHERAL_BASE 0xF0000000
#define SDIO_BASE (ARC_PERIPHERAL_BASE + 0x10000)
#define ARC_PERIPHERAL_BASE 0xF0000000
#define CGU_ARC_FMEAS_ARC (void *)(ARC_PERIPHERAL_BASE + 0x84)
#define CGU_ARC_FMEAS_ARC_START BIT(31)
#define CGU_ARC_FMEAS_ARC_DONE BIT(30)
#define CGU_ARC_FMEAS_ARC_CNT_MASK GENMASK(14, 0)
#define CGU_ARC_FMEAS_ARC_RCNT_OFFSET 0
#define CGU_ARC_FMEAS_ARC_FCNT_OFFSET 15
#define SDIO_BASE (void *)(ARC_PERIPHERAL_BASE + 0x10000)
int mach_cpu_init(void)
{
int rcnt, fcnt;
u32 data;
/* Start frequency measurement */
writel(CGU_ARC_FMEAS_ARC_START, CGU_ARC_FMEAS_ARC);
/* Poll DONE bit */
do {
data = readl(CGU_ARC_FMEAS_ARC);
} while (!(data & CGU_ARC_FMEAS_ARC_DONE));
/* Amount of reference 100 MHz clocks */
rcnt = ((data >> CGU_ARC_FMEAS_ARC_RCNT_OFFSET) &
CGU_ARC_FMEAS_ARC_CNT_MASK);
/* Amount of CPU clocks */
fcnt = ((data >> CGU_ARC_FMEAS_ARC_FCNT_OFFSET) &
CGU_ARC_FMEAS_ARC_CNT_MASK);
gd->cpu_clk = ((100 * fcnt) / rcnt) * 1000000;
return 0;
}
int board_mmc_init(bd_t *bis)
{
@ -24,7 +60,7 @@ int board_mmc_init(bd_t *bis)
memset(host, 0, sizeof(struct dwmci_host));
host->name = "Synopsys Mobile storage";
host->ioaddr = (void *)SDIO_BASE;
host->ioaddr = SDIO_BASE;
host->buswidth = 4;
host->dev_index = 0;
host->bus_hz = 50000000;