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net: stmmac: Configure gtxclk based on speed

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Tom 2021-04-06 13:30:26 +08:00 • committed by Emil Renner Berthing
parent 31764b3dcd
commit d1672a46bd
1 changed files with 47 additions and 0 deletions
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47
drivers/net/ethernet/stmicro/stmmac/dwmac-generic.c
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@ -16,6 +16,50 @@
#include "stmmac.h"
#include "stmmac_platform.h"
/*
* GMAC_GTXCLK 为 gmac 的时钟分频寄存器，低8位为分频值
* bit name access default descript
* [31] clk_gmac_gtxclk enable RW 0x0 "1:enable; 0:disable"
* [30] reserved - 0x0 reserved
* [29:8] reserved - 0x0 reserved
* [7:0] clk_gmac_gtxclk divide ratio RW 0x4 divide value
*
* gmac 的 root 时钟为500M, gtxclk 需求的时钟如下：
* 1000M: gtxclk为125M，分频值为500/125 = 0x4
* 100M: gtxclk为25M， 分频值为500/25 = 0x14
* 10M: gtxclk为2.5M，分频值为500/2.5 = 0xc8
*/
#ifdef CONFIG_SOC_STARFIVE_VIC7100
#define CLKGEN_BASE 0x11800000
#define CLKGEN_GMAC_GTXCLK_OFFSET 0x1EC
#define CLKGEN_GMAC_GTXCLK_ADDR (CLKGEN_BASE + CLKGEN_GMAC_GTXCLK_OFFSET)
#define CLKGEN_125M_DIV 0x4
#define CLKGEN_25M_DIV 0x14
#define CLKGEN_2_5M_DIV 0xc8
static void dwmac_fixed_speed(void *priv, unsigned int speed)
{
u32 value;
void *addr = ioremap(CLKGEN_GMAC_GTXCLK_ADDR, sizeof(value));
if (!addr) {
pr_err("%s can't remap CLKGEN_GMAC_GTXCLK_ADDR\n", __func__);
return;
}
value = readl(addr) & (~0x000000FF);
switch (speed) {
case SPEED_1000: value |= CLKGEN_125M_DIV; break;
case SPEED_100: value |= CLKGEN_25M_DIV; break;
case SPEED_10: value |= CLKGEN_2_5M_DIV; break;
default: iounmap(addr); return;
}
writel(value, addr); /*set gmac gtxclk*/
iounmap(addr);
}
#endif
static int dwmac_generic_probe(struct platform_device *pdev)
{
struct plat_stmmacenet_data *plat_dat;
@ -52,6 +96,9 @@ static int dwmac_generic_probe(struct platform_device *pdev)
if (ret)
goto err_remove_config_dt;
}
#ifdef CONFIG_SOC_STARFIVE_VIC7100
plat_dat->fix_mac_speed = dwmac_fixed_speed;
#endif
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret)