linux-3.9.7 sdhci 驱动移植 基于QT210
一、配置内核
Device Drivers--->MMC/SD/SDIO card support -->
-->Secure Digital Host Controller Interface support
-->SDHCI support on Samsung S3C SoC
二、
1、在mach-smdkv210.c中添加头文件
#include <plat/sdhci.h>
2、添加平台数据
#ifdef CONFIG_S3C_DEV_HSMMC
static struct s3c_sdhci_platdata smdkc110_hsmmc0_pdata __initdata = {
.cd_type = S3C_SDHCI_CD_INTERNAL,
#if defined(CONFIG_S5PV210_SD_CH0_8BIT)
.max_width = 8,
.host_caps = MMC_CAP_8_BIT_DATA,
#endif
};
#endif
3、在函数static void __init smdkv210_machine_init(void)设置平台设备
#ifdef CONFIG_S3C_DEV_HSMMC
s3c_sdhci0_set_platdata(&smdkc110_hsmmc0_pdata);
#endif
三、编译运行
sdhci: Secure Digital Host Controller Interface driver sdhci: Copyright(c) Pierre Ossman s3c-sdhci s3c-sdhci.0: clock source 0: mmc_busclk.0 (133800000 Hz) s3c-sdhci s3c-sdhci.0: clock source 2: mmc_busclk.2 (47785714 Hz) mmc0: SDHCI controller on samsung-hsmmc [s3c-sdhci.0] using ADMA s3c-sdhci s3c-sdhci.1: clock source 0: mmc_busclk.0 (133800000 Hz) s3c-sdhci s3c-sdhci.1: clock source 2: mmc_busclk.2 (47785714 Hz) Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c0004000 [00000000] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT ARM Modules linked in: CPU: 0 Not tainted (3.9.7 #37) PC is at wake_up_process+0x4/0x40 LR is at sdhci_irq+0x390/0x78c pc : [<c0045ea0>] lr : [<c02dd420>] psr: 60000193 sp : df849c60 ip : 00010000 fp : c0505e33 r10: 00000000 r9 : c04ed6e4 r8 : 00000000 r7 : 00000001 r6 : 00000000 r5 : 00000100 r4 : df9d2000 r3 : 00000000 r2 : 00010000 r1 : 20000193 r0 : 00000000 Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel Control: 10c5387d Table: 20004019 DAC: 00000015 Process swapper (pid: 1, stack limit = 0xdf848238) Stack: (0xdf849c60 to 0xdf84a000) 9c60: df9d2000 00000100 c0505e33 c02dd420 df849ce8 df9d2370 c0505718 c0042628 9c80: 00000000 df801180 000000d0 dfa94780 c04ed6cc 00000000 00000000 0000005a 9ca0: c04ed6e4 c04ed67c c0505e33 c0067074 c095e030 df801180 60000113 c04ed67c 9cc0: c04ed6cc dfa94780 00000000 c054fec0 00000000 c03aad88 c0452efc c0067210 9ce0: c04ed67c c04ed6cc 00000000 c00691d8 c04f7924 0000005a 00000000 c0066a00 9d00: 000000d0 c0014720 c054fee8 df849d30 00000001 c0008538 c0220188 20000113 9d20: ffffffff df849d64 000008b5 c0013440 df816250 00000d80 00000000 00000000 9d40: df801480 00000001 df816000 000008b4 000008b5 00000000 c03aad88 c0452efc 9d60: 00000000 df849d7c 00000000 c0220188 20000113 ffffffff df849dc8 c00a11c0 9d80: df9d3010 00000001 c045fc68 df8197c0 00000000 c02239c4 df849dc8 dfa95040 9da0: 00000000 df849dc8 dfa94f80 00000001 00000000 c00fbf0c df849dcc 00000000 9dc0: 00000004 c00fa5b8 df935f80 df9d3008 df9d3010 c04e48c0 00000000 c0553fdc 9de0: c050041c 00000004 00000000 c0276d44 c04ed760 00000000 dfa94d50 a0000113 9e00: df9d3340 c02dd090 0000005b df9d3000 df9d3000 df9d3008 df9d33f4 df9d3408 9e20: dfa94c90 00000004 df9d34d0 c02cdea8 df9d3340 df9d3000 00000000 c02de034 9e40: dfa94c40 df9d3340 c04e48b0 df9d3340 c04e48c0 0000005b df9d34c0 c02dee04 9e60: 02d926f2 c00fbf0c 0000005b 00000000 5f636d6d 63737562 332e6b6c 00000000 9e80: c0554008 c0554000 c0554008 c04e48f4 c04e48c0 c050084c c04d2104 c04ac164 9ea0: 00000000 c0279f50 c0279f3c c0278f10 00000000 c04e48c0 c050084c c04e48f4 9ec0: 00000000 c04c2314 c04ac164 c027911c c050084c c0279090 df849ee0 c027782c 9ee0: df803878 df90be40 00000000 c050084c c04fd858 df91b100 00000000 c0278798 9f00: c042ea78 c050084c c050084c c0505f00 df848000 00000000 c04c2314 c027941c 9f20: 00000000 c04c99cc c0505f00 df848000 00000000 c04c2314 c04ac164 c00085e8 9f40: c045e43c c048cb08 00000006 00000006 c04e7670 c04c99c8 00000006 c04c99cc 9f60: 00000006 c04c99ac c0505f00 0000007c c04ac164 c04ac8f0 00000006 00000006 9f80: c04ac164 c004566c 00000000 c0389064 00000000 00000000 00000000 00000000 9fa0: 00000000 c038906c 00000000 c00138d8 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 bebfffdb bdfe7f17 Code: e28bd000 e8bd0800 eaffffc0 e92d4830 (e5903000) ---[ end trace 0e5af1bea14335f2 ]--- Kernel panic - not syncing: Fatal exception in interrupt
根据函数调用关系
sdhci_irq--->mmc_signal_sdio_irq--->
static inline void mmc_signal_sdio_irq(struct mmc_host *host)
{
host->ops->enable_sdio_irq(host, 0);
host->sdio_irq_pending = true;
wake_up_process(host->sdio_irq_thread);
}打log发现sdio_irq_thread是个空指针
但是一直不明白为什么其他型号没有这个问题
只好注释掉这个wake_up_process
同时发现网上有人提到过这个问题
https://groups.google.com/forum/#!msg/linux.kernel/0qRjyAz70uc/AGaFj906W54J
修改如下
static inline void mmc_signal_sdio_irq(struct mmc_host *host)
{
host->ops->enable_sdio_irq(host, 0);
host->sdio_irq_pending = true;
if (host->sdio_irq_thread)
wake_up_process(host->sdio_irq_thread);
}
sd卡可以识别
正常的log如下
sdhci: Secure Digital Host Controller Interface driver sdhci: Copyright(c) Pierre Ossman s3c-sdhci s3c-sdhci.0: clock source 0: mmc_busclk.0 (133800000 Hz) s3c-sdhci s3c-sdhci.0: clock source 2: mmc_busclk.2 (47785714 Hz) mmc0: SDHCI controller on samsung-hsmmc [s3c-sdhci.0] using ADMA s3c-sdhci s3c-sdhci.1: clock source 0: mmc_busclk.0 (133800000 Hz) s3c-sdhci s3c-sdhci.1: clock source 2: mmc_busclk.2 (47785714 Hz) mmc0: new high speed SD card at address 1234 mmcblk0: mmc0:1234 SA02G 1.81 GiB mmcblk0: p1 p2 p3 mmc1: SDHCI controller on samsung-hsmmc [s3c-sdhci.1] using ADMA s3c-sdhci s3c-sdhci.2: clock source 0: mmc_busclk.0 (133800000 Hz) s3c-sdhci s3c-sdhci.2: clock source 2: mmc_busclk.2 (80000000 Hz) mmc2: SDHCI controller on samsung-hsmmc [s3c-sdhci.2] using ADMA s3c-sdhci s3c-sdhci.3: clock source 0: mmc_busclk.0 (133800000 Hz) s3c-sdhci s3c-sdhci.3: clock source 2: mmc_busclk.2 (80000000 Hz) mmc3: SDHCI controller on samsung-hsmmc [s3c-sdhci.3] using ADMA
以后继续分析 中断产生，sdio_irq_thread却是空指针的原因。