需要注释掉 drivers/mmc/host/himci/himci.c 里面的
/* | MMC_CAP_UHS_SDR12 */
/* | MMC_CAP_UHS_SDR25 */
/* | MMC_CAP_UHS_SDR50 */
/* | MMC_CAP_UHS_DDR50 */
/* | MMC_CAP_UHS_SDR104 */
另外由于CARD_DETECT是上拉到3.3V了,而且没有导出这只引脚,因此放弃使用CARD_DETECT,使用PWR_EN引脚作为CARD_DETECT
需要修改 uboot 的reginfo.bin,修改引脚复用
200F0000
0x0EC muxctrl_reg59 SDIO1_CARD_POWER_EN 管脚的复用控制寄存器2-97
0 GPIO11_1
1 SDIO1_CARD_POWER_EN
这个复用改成0。也就是说把J21引脚功能改成GPIO11_1
还需要修改hi_mci_sys_card_detect函数的实现,下面会说怎么改
先说GPIO怎么配置
GPIO11基地址 0x201F_0000
表13-21 GPIO 寄存器概览
偏移地址 名称 描述 页码
0x000~0x3FC GPIO_DATA GPIO 数据寄存器 13-148
0x400 GPIO_DIR GPIO 方向控制寄存器 13-148 <<<<<<<<<<<< [0:7]有效 0输入 1输出 <<<<<<<<<<<<<<
0x404 GPIO_IS GPIO 中断触发寄存器 13-149
0x408 GPIO_IBE GPIO 双沿触发中断寄存器 13-149
0x40C GPIO_IEV GPIO 触发中断条件寄存器 13-150
0x410 GPIO_IE GPIO 中断屏蔽寄存器 13-150 <<<<<<<<<<<< [0:7]有效 0屏蔽 1不屏蔽 <<<<<<<<<<<<<<
0x414 GPIO_RIS GPIO 原始中断状态寄存器 13-151
0x418 GPIO_MIS GPIO 屏蔽状态中断寄存器 13-151
0x41C GPIO_IC GPIO 中断清除寄存器 13-152
DATA寄存器 0~3FC [9:0] 共10比特,低2比特是 4字节对齐操作的,因此高8比特分别对应8个GPIO管脚的有效MASK
例如
如果只想写入GPIOX_7为1,则向地址 +0x200 写入 0x80 即可。
如果只想写入GPIOX_1为1,则向地址 +0x8 写入 0x02 即可。
读取同理<<<<<<<<<<<<<
修改代码 hi_mci.h
himci_host 结构体 追加
void __iomem *gpio_cd_base;
修改代码 himci.c
hi_mci_probe函数
#ifdef CONFIG_HIMCI0
host->id = 0;
host->base = ioremap_nocache(CONFIG_HIMCI0_IOBASE, HI_MCI_IO_SIZE);
host->gpio_cd_base = NULL; //sdio0 not use
#endif
} else if (1 == pdev->id) {
#ifdef CONFIG_HIMCI1
unsigned int regv;
host->id = 1;
host->base = ioremap_nocache(CONFIG_HIMCI1_IOBASE, HI_MCI_IO_SIZE);
host->gpio_cd_base = ioremap_nocache(0x201F0000, 0x1000);
regv = readl(host->gpio_cd_base + 0x400);
himci_writel(regv & (~(1<<1)), host->gpio_cd_base + 0x400);
regv = readl(host->gpio_cd_base + 0x410);
himci_writel(regv & (~(1<<1)), host->gpio_cd_base + 0x410);
#endif
修改函数 hi_mci_sys_card_detect
/**********************************************
*1: card off
*0: card on
***********************************************/
static unsigned int hi_mci_sys_card_detect(struct himci_host *host)
{
unsigned int regv;
if(host->gpio_cd_base == NULL)
return 1;
regv = readl(host->gpio_cd_base + 0x3FC);
if(regv & (1<<1))
return 1;
return 0;
}
这样原P8的12pin座第七个引脚SDIO1_POWER_EN就改成了CARD_DETECT功能。注意这个引脚是直接引出的,这里使用的时候需要上拉电阻到3.3V。当CD被拉低时表示有卡插入
编译了内核后测试正常
反复插卡拔卡日志如下
card connected!
mmc1: new high speed SDHC card at address aaaa
mmcblk0: mmc1:aaaa SL16G 14.8 GiB
mmcblk0: p1
card disconnected!
mmc1: card aaaa removed
card connected!
mmc1: new high speed SDHC card at address aaaa
mmcblk0: mmc1:aaaa SL16G 14.8 GiB
mmcblk0: p1
card disconnected!
mmc1: card aaaa removed
card connected!
mmc1: new high speed SDHC card at address aaaa
mmcblk0: mmc1:aaaa SL16G 14.8 GiB
mmcblk0: p1
连续读写性能测试
/mnt/mmcp1 # dd if=/dev/zero of=speedtest.bin bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes (62.5MB) copied, 6.113585 seconds, 10.2MB/s
/mnt/mmcp1 # dd if=/dev/zero of=speedtest.bin bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes (62.5MB) copied, 6.367149 seconds, 9.8MB/s
/mnt/mmcp1 # dd if=/dev/zero of=speedtest.bin bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes (62.5MB) copied, 6.397446 seconds, 9.8MB/s
/mnt/mmcp1 # dd if=/dev/zero of=speedtest.bin bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes (62.5MB) copied, 6.227193 seconds, 10.0MB/s
/mnt/mmcp1 # dd if=/dev/zero of=speedtest.bin bs=256k count=1000
1000+0 records in
1000+0 records out
262144000 bytes (250.0MB) copied, 26.237983 seconds, 9.5MB/s
/mnt/mmcp1 # dd if=speedtest.bin of=/dev/null bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes (62.5MB) copied, 3.138901 seconds, 19.9MB/s
/mnt/mmcp1 # dd if=speedtest.bin of=/dev/null bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes (62.5MB) copied, 3.118107 seconds, 20.0MB/s
/mnt/mmcp1 # dd if=speedtest.bin of=/dev/null bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes (62.5MB) copied, 3.118156 seconds, 20.0MB/s
/mnt/mmcp1 # dd if=speedtest.bin of=/dev/null bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes (62.5MB) copied, 3.173567 seconds, 19.7MB/s