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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2014 Broadcom Corporation.
*/
#include <common.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <asm/arch/sysmap.h>
#include <asm/kona-common/clk.h>
#include "clk-core.h"
#define WR_ACCESS_ADDR ESUB_CLK_BASE_ADDR
#define WR_ACCESS_PASSWORD 0xA5A500
#define PLLE_POST_RESETB_ADDR (ESUB_CLK_BASE_ADDR + 0x00000C00)
#define PLLE_RESETB_ADDR (ESUB_CLK_BASE_ADDR + 0x00000C58)
#define PLLE_RESETB_I_PLL_RESETB_PLLE_MASK 0x00010000
#define PLLE_POST_RESETB_I_POST_RESETB_PLLE_MASK 0x00000001
#define PLL_LOCK_ADDR (ESUB_CLK_BASE_ADDR + 0x00000C38)
#define PLL_LOCK_PLL_LOCK_PLLE_MASK 0x00000001
#define ESW_SYS_DIV_ADDR (ESUB_CLK_BASE_ADDR + 0x00000A04)
#define ESW_SYS_DIV_PLL_SELECT_MASK 0x00000300
#define ESW_SYS_DIV_DIV_MASK 0x0000001C
#define ESW_SYS_DIV_PLL_VAR_208M_CLK_SELECT 0x00000100
#define ESW_SYS_DIV_DIV_SELECT 0x4
#define ESW_SYS_DIV_TRIGGER_MASK 0x00000001
#define ESUB_AXI_DIV_DEBUG_ADDR (ESUB_CLK_BASE_ADDR + 0x00000E04)
#define ESUB_AXI_DIV_DEBUG_PLL_SELECT_MASK 0x0000001C
#define ESUB_AXI_DIV_DEBUG_PLL_SELECT_OVERRIDE_MASK 0x00000040
#define ESUB_AXI_DIV_DEBUG_PLL_VAR_208M_CLK_SELECT 0x0
#define ESUB_AXI_DIV_DEBUG_TRIGGER_MASK 0x00000001
#define PLL_MAX_RETRY 100
/* Enable appropriate clocks for Ethernet */
int clk_eth_enable(void)
{
int rc = -1;
int retry_count = 0;
rc = clk_get_and_enable("esub_ccu_clk");
/* Enable Access to CCU registers */
writel((1 | WR_ACCESS_PASSWORD), WR_ACCESS_ADDR);
writel(readl(PLLE_POST_RESETB_ADDR) &
~PLLE_POST_RESETB_I_POST_RESETB_PLLE_MASK,
PLLE_POST_RESETB_ADDR);
/* Take PLL out of reset and put into normal mode */
writel(readl(PLLE_RESETB_ADDR) | PLLE_RESETB_I_PLL_RESETB_PLLE_MASK,
PLLE_RESETB_ADDR);
/* Wait for PLL lock */
rc = -1;
while (retry_count < PLL_MAX_RETRY) {
udelay(100);
if (readl(PLL_LOCK_ADDR) & PLL_LOCK_PLL_LOCK_PLLE_MASK) {
rc = 0;
break;
}
retry_count++;
}
if (rc == -1) {
printf("%s: ETH-PLL lock timeout, Ethernet is not enabled!\n",
__func__);
return -1;
}
writel(readl(PLLE_POST_RESETB_ADDR) |
PLLE_POST_RESETB_I_POST_RESETB_PLLE_MASK,
PLLE_POST_RESETB_ADDR);
/* Switch esw_sys_clk to use 104MHz(208MHz/2) clock */
writel((readl(ESW_SYS_DIV_ADDR) &
~(ESW_SYS_DIV_PLL_SELECT_MASK | ESW_SYS_DIV_DIV_MASK)) |
ESW_SYS_DIV_PLL_VAR_208M_CLK_SELECT | ESW_SYS_DIV_DIV_SELECT,
ESW_SYS_DIV_ADDR);
writel(readl(ESW_SYS_DIV_ADDR) | ESW_SYS_DIV_TRIGGER_MASK,
ESW_SYS_DIV_ADDR);
/* Wait for trigger complete */
rc = -1;
retry_count = 0;
while (retry_count < PLL_MAX_RETRY) {
udelay(100);
if (!(readl(ESW_SYS_DIV_ADDR) & ESW_SYS_DIV_TRIGGER_MASK)) {
rc = 0;
break;
}
retry_count++;
}
if (rc == -1) {
printf("%s: SYS CLK Trigger timeout, Ethernet is not enabled!\n",
__func__);
return -1;
}
/* switch Esub AXI clock to 208MHz */
writel((readl(ESUB_AXI_DIV_DEBUG_ADDR) &
~(ESUB_AXI_DIV_DEBUG_PLL_SELECT_MASK |
ESUB_AXI_DIV_DEBUG_PLL_SELECT_OVERRIDE_MASK |
ESUB_AXI_DIV_DEBUG_TRIGGER_MASK)) |
ESUB_AXI_DIV_DEBUG_PLL_VAR_208M_CLK_SELECT |
ESUB_AXI_DIV_DEBUG_PLL_SELECT_OVERRIDE_MASK,
ESUB_AXI_DIV_DEBUG_ADDR);
writel(readl(ESUB_AXI_DIV_DEBUG_ADDR) |
ESUB_AXI_DIV_DEBUG_TRIGGER_MASK,
ESUB_AXI_DIV_DEBUG_ADDR);
/* Wait for trigger complete */
rc = -1;
retry_count = 0;
while (retry_count < PLL_MAX_RETRY) {
udelay(100);
if (!(readl(ESUB_AXI_DIV_DEBUG_ADDR) &
ESUB_AXI_DIV_DEBUG_TRIGGER_MASK)) {
rc = 0;
break;
}
retry_count++;
}
if (rc == -1) {
printf("%s: AXI CLK Trigger timeout, Ethernet is not enabled!\n",
__func__);
return -1;
}
/* Disable Access to CCU registers */
writel(WR_ACCESS_PASSWORD, WR_ACCESS_ADDR);
return rc;
}
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