* @copyright Copyright (c) 2022
*
*/
-#include <hal/ahci.h>
+#include <hal/ahci/ahci.h>
+#include <hal/ahci/hba.h>
+#include <hal/ahci/sata.h>
+#include <hal/ahci/scsi.h>
+#include <hal/ahci/utils.h>
+
#include <hal/pci.h>
#include <klibc/string.h>
-#include <lunaix/mm/kalloc.h>
#include <lunaix/mm/mmio.h>
#include <lunaix/mm/pmm.h>
+#include <lunaix/mm/valloc.h>
+#include <lunaix/mm/vmm.h>
#include <lunaix/spike.h>
#include <lunaix/syslog.h>
#define HBA_FIS_SIZE 256
#define HBA_CLB_SIZE 1024
+// #define DO_HBA_FULL_RESET
+
LOG_MODULE("AHCI")
static struct ahci_hba hba;
+void
+__ahci_hba_isr(isr_param param);
+
+int
+ahci_init_device(struct hba_port* port);
+
+void
+achi_register_ops(struct hba_port* port);
+
+unsigned int
+ahci_get_port_usage()
+{
+ return hba.ports_bmp;
+}
+
+struct hba_port*
+ahci_get_port(unsigned int index)
+{
+ if (index >= 32) {
+ return 0;
+ }
+ return hba.ports[index];
+}
+
+void
+__hba_reset_port(hba_reg_t* port_reg)
+{
+ // 根据：SATA-AHCI spec section 10.4.2 描述的端口重置流程
+ port_reg[HBA_RPxCMD] &= ~HBA_PxCMD_ST;
+ port_reg[HBA_RPxCMD] &= ~HBA_PxCMD_FRE;
+ int cnt = wait_until_expire(!(port_reg[HBA_RPxCMD] & HBA_PxCMD_CR), 500000);
+ if (cnt) {
+ return;
+ }
+ // 如果port未响应，则继续执行重置
+ port_reg[HBA_RPxSCTL] = (port_reg[HBA_RPxSCTL] & ~0xf) | 1;
+ io_delay(100000); //等待至少一毫秒，差不多就行了
+ port_reg[HBA_RPxSCTL] &= ~0xf;
+}
+
void
ahci_init()
{
pci_write_cspace(ahci_dev->cspace_base, PCI_REG_STATUS_CMD, cmd);
+ pci_setup_msi(ahci_dev, AHCI_HBA_IV);
+ intr_subscribe(AHCI_HBA_IV, __ahci_hba_isr);
+
+ memset(&hba, 0, sizeof(hba));
+
hba.base = (hba_reg_t*)ioremap(PCI_BAR_ADDR_MM(bar6), size);
+#ifdef DO_HBA_FULL_RESET
// 重置HBA
hba.base[HBA_RGHC] |= HBA_RGHC_RESET;
wait_until(!(hba.base[HBA_RGHC] & HBA_RGHC_RESET));
+#endif
// 启用AHCI工作模式，启用中断
- hba.base[HBA_RGHC] |= (HBA_RGHC_ACHI_ENABLE | HBA_RGHC_INTR_ENABLE);
+ hba.base[HBA_RGHC] |= HBA_RGHC_ACHI_ENABLE;
+ hba.base[HBA_RGHC] |= HBA_RGHC_INTR_ENABLE;
// As per section 3.1.1, this is 0 based value.
hba_reg_t cap = hba.base[HBA_RCAP];
+ hba_reg_t pmap = hba.base[HBA_RPI];
+
hba.ports_num = (cap & 0x1f) + 1; // CAP.PI
hba.cmd_slots = (cap >> 8) & 0x1f; // CAP.NCS
hba.version = hba.base[HBA_RVER];
+ hba.ports_bmp = pmap;
/* ------ HBA端口配置 ------ */
- hba_reg_t pmap = hba.base[HBA_RPI];
uintptr_t clb_pg_addr, fis_pg_addr, clb_pa, fis_pa;
for (size_t i = 0, fisp = 0, clbp = 0; i < 32;
i++, pmap >>= 1, fisp = (fisp + 1) % 16, clbp = (clbp + 1) % 4) {
continue;
}
- struct ahci_port* port =
- (struct ahci_port*)lxmalloc(sizeof(struct ahci_port));
+ struct hba_port* port =
+ (struct hba_port*)valloc(sizeof(struct hba_port));
hba_reg_t* port_regs =
(hba_reg_t*)(&hba.base[HBA_RPBASE + i * HBA_RPSIZE]);
+#ifndef DO_HBA_FULL_RESET
+ __hba_reset_port(port_regs);
+#endif
+
if (!clbp) {
// 每页最多4个命令队列
clb_pa = pmm_alloc_page(KERNEL_PID, PP_FGLOCKED);
port_regs[HBA_RPxCLB] = clb_pa + clbp * HBA_CLB_SIZE;
port_regs[HBA_RPxFB] = fis_pa + fisp * HBA_FIS_SIZE;
- *port =
- (struct ahci_port){ .regs = port_regs,
- .ssts = port_regs[HBA_RPxSSTS],
- .cmdlstv = clb_pg_addr + clbp * HBA_CLB_SIZE,
- .fisv = fis_pg_addr + fisp * HBA_FIS_SIZE };
+ *port = (struct hba_port){ .regs = port_regs,
+ .ssts = port_regs[HBA_RPxSSTS],
+ .cmdlst = clb_pg_addr + clbp * HBA_CLB_SIZE,
+ .fis = fis_pg_addr + fisp * HBA_FIS_SIZE };
/* 初始化端口，并置于就绪状态 */
port_regs[HBA_RPxCI] = 0;
- port_regs[HBA_RPxIE] |= (HBA_PxINTR_DMA | HBA_PxINTR_D2HR);
- port_regs[HBA_RPxCMD] |= (HBA_PxCMD_FRE | HBA_PxCMD_ST);
+
+ // 需要通过全部置位去清空这些寄存器（相当的奇怪……）
+ port_regs[HBA_RPxSERR] = -1;
+
+ port_regs[HBA_RPxIE] |= (HBA_PxINTR_DPS);
hba.ports[i] = port;
+
+ if (!HBA_RPxSSTS_IF(port->ssts)) {
+ continue;
+ }
+
+ wait_until(!(port_regs[HBA_RPxCMD] & HBA_PxCMD_CR));
+ port_regs[HBA_RPxCMD] |= HBA_PxCMD_FRE;
+ port_regs[HBA_RPxCMD] |= HBA_PxCMD_ST;
+
+ if (!ahci_init_device(port)) {
+ kprintf(KERROR "fail to init device");
+ }
}
}
"SATA II (3.0Gbps)",
"SATA III (6.0Gbps)" };
+void
+__ahci_hba_isr(isr_param param)
+{
+ // TODO: hba interrupt
+ kprintf(KDEBUG "HBA INTR\n");
+}
+
void
ahci_list_device()
{
- kprintf(KINFO "Version: %x; Ports: %d\n", hba.version, hba.ports_num);
+ kprintf(KINFO "Version: %x; Ports: %d; Slot: %d\n",
+ hba.version,
+ hba.ports_num,
+ hba.cmd_slots);
+ struct hba_port* port;
for (size_t i = 0; i < 32; i++) {
- struct ahci_port* port = hba.ports[i];
- if (!port)
+ port = hba.ports[i];
+
+ // 愚蠢的gcc似乎认为 struct hba_port* 不可能为空
+ // 所以将这个非常关键的if给优化掉了。
+ // 这里将指针强制转换为整数，欺骗gcc :)
+ if ((uintptr_t)port == 0) {
continue;
- kprintf("\t Port %d: %s\n", i, &sata_ifs[HBA_RPxSSTS_IF(port->ssts)]);
+ }
+
+ int device_state = HBA_RPxSSTS_IF(port->ssts);
+
+ kprintf("\t Port %d: %s (%x)\n",
+ i,
+ &sata_ifs[device_state],
+ port->device->flags);
+
+ struct hba_device* dev_info = port->device;
+ if (!device_state || !dev_info) {
+ continue;
+ }
+ kprintf("\t\t capacity: %d KiB\n",
+ (dev_info->max_lba * dev_info->block_size) >> 10);
+ kprintf("\t\t block size: %dB\n", dev_info->block_size);
+ kprintf("\t\t block/sector: %d\n", dev_info->block_per_sec);
+ kprintf("\t\t alignment: %dB\n", dev_info->alignment_offset);
+ kprintf("\t\t capabilities: %x\n", dev_info->capabilities);
+ kprintf("\t\t model: %s\n", &dev_info->model);
+ kprintf("\t\t serial: %s\n", &dev_info->serial_num);
+ }
+}
+
+int
+__get_free_slot(struct hba_port* port)
+{
+ hba_reg_t pxsact = port->regs[HBA_RPxSACT];
+ hba_reg_t pxci = port->regs[HBA_RPxCI];
+ hba_reg_t free_bmp = pxsact | pxci;
+ uint32_t i = 0;
+ for (; i <= hba.cmd_slots && (free_bmp & 0x1); i++, free_bmp >>= 1)
+ ;
+ return i | -(i > hba.cmd_slots);
+}
+
+void
+sata_create_fis(struct sata_reg_fis* cmd_fis,
+ uint8_t command,
+ uint64_t lba,
+ uint16_t sector_count)
+{
+ cmd_fis->head.type = SATA_REG_FIS_H2D;
+ cmd_fis->head.options = SATA_REG_FIS_COMMAND;
+ cmd_fis->head.status_cmd = command;
+ cmd_fis->dev = 0;
+
+ cmd_fis->lba0 = SATA_LBA_COMPONENT(lba, 0);
+ cmd_fis->lba8 = SATA_LBA_COMPONENT(lba, 8);
+ cmd_fis->lba16 = SATA_LBA_COMPONENT(lba, 16);
+ cmd_fis->lba24 = SATA_LBA_COMPONENT(lba, 24);
+
+ cmd_fis->lba32 = SATA_LBA_COMPONENT(lba, 32);
+ cmd_fis->lba40 = SATA_LBA_COMPONENT(lba, 40);
+
+ cmd_fis->count = sector_count;
+}
+
+int
+hba_prepare_cmd(struct hba_port* port,
+ struct hba_cmdt** cmdt,
+ struct hba_cmdh** cmdh,
+ void* buffer,
+ unsigned int size)
+{
+ int slot = __get_free_slot(port);
+ assert_msg(slot >= 0, "HBA: No free slot");
+ assert_msg(size <= 0x400000, "HBA: buffer too big");
+
+ // 构建命令头（Command Header）和命令表（Command Table）
+ struct hba_cmdh* cmd_header = &port->cmdlst[slot];
+ struct hba_cmdt* cmd_table = vcalloc_dma(sizeof(struct hba_cmdt));
+
+ memset(cmd_header, 0, sizeof(*cmd_header));
+
+ // 将命令表挂到命令头上
+ cmd_header->cmd_table_base = vmm_v2p(cmd_table);
+ cmd_header->options =
+ HBA_CMDH_FIS_LEN(sizeof(struct sata_reg_fis)) | HBA_CMDH_CLR_BUSY;
+
+ if (buffer) {
+ cmd_header->prdt_len = 1;
+ cmd_table->entries[0] =
+ (struct hba_prdte){ .data_base = vmm_v2p(buffer),
+ .byte_count = (size - 1) | (0x80000000) };
+ }
+
+ *cmdh = cmd_header;
+ *cmdt = cmd_table;
+
+ return slot;
+}
+
+int
+ahci_init_device(struct hba_port* port)
+{
+ /* 发送ATA命令，参考：SATA AHCI Spec Rev.1.3.1, section 5.5 */
+ struct hba_cmdt* cmd_table;
+ struct hba_cmdh* cmd_header;
+
+ // 确保端口是空闲的
+ wait_until(!(port->regs[HBA_RPxTFD] & (HBA_PxTFD_BSY)));
+
+ // 预备DMA接收缓存，用于存放HBA传回的数据
+ uint16_t* data_in = (uint16_t*)valloc_dma(512);
+
+ int slot = hba_prepare_cmd(port, &cmd_table, &cmd_header, data_in, 512);
+
+ // 清空任何待响应的中断
+ port->regs[HBA_RPxIS] = 0;
+ port->device = vcalloc(sizeof(struct hba_device));
+
+ // 在命令表中构建命令FIS
+ struct sata_reg_fis* cmd_fis = (struct sata_reg_fis*)cmd_table->command_fis;
+
+ // 根据设备类型使用合适的命令
+ if (port->regs[HBA_RPxSIG] == HBA_DEV_SIG_ATA) {
+ // ATA 一般为硬盘
+ sata_create_fis(cmd_fis, ATA_IDENTIFY_DEVICE, 0, 0);
+ } else {
+ // ATAPI 一般为光驱，软驱，或者磁带机
+ port->device->flags |= HBA_DEV_FATAPI;
+ sata_create_fis(cmd_fis, ATA_IDENTIFY_PAKCET_DEVICE, 0, 0);
+ }
+
+ // PxCI寄存器置位，告诉HBA这儿有个数据需要发送到SATA端口
+ port->regs[HBA_RPxCI] = (1 << slot);
+
+ wait_until(!(port->regs[HBA_RPxCI] & (1 << slot)));
+
+ if ((port->regs[HBA_RPxTFD] & HBA_PxTFD_ERR)) {
+ // 有错误
+ sata_read_error(port);
+ goto fail;
+ }
+
+ /*
+ 等待数据到达内存
+ 解析IDENTIFY DEVICE传回来的数据。
+ 参考：
+ * ATA/ATAPI Command Set - 3 (ACS-3), Section 7.12.7
+ */
+ ahci_parse_dev_info(port->device, data_in);
+
+ if (!(port->device->flags & HBA_DEV_FATAPI)) {
+ goto done;
+ }
+
+ /*
+ 注意：ATAPI设备是无法通过IDENTIFY PACKET DEVICE 获取容量信息的。
+ 我们需要使用SCSI命令的READ_CAPACITY(16)进行获取。
+ 步骤如下：
+ 1. 因为ATAPI走的是SCSI，而AHCI对此专门进行了SATA的封装，
+ 也就是通过SATA的PACKET命令对SCSI命令进行封装。所以我们
+ 首先需要构建一个PACKET命令的FIS
+ 2. 接着，在ACMD中构建命令READ_CAPACITY的CDB - 一种SCSI命令的封装
+ 3. 然后把cmd_header->options的A位置位，表示这是一个送往ATAPI的命令。
+ 一点细节：
+ 1. HBA往底层SATA控制器发送PACKET FIS
+ 2. SATA控制器回复PIO Setup FIS
+ 3. HBA读入ACMD中的CDB，打包成Data FIS进行答复
+ 4. SATA控制器解包，拿到CDB，通过SCSI协议转发往ATAPI设备。
+ 5. ATAPI设备回复Return Parameter，SATA通过DMA Setup FIS
+ 发起DMA请求，HBA介入，将Return Parameter写入我们在PRDT
+ 里设置的data_in位置。
+ 4. 最后照常等待HBA把结果写入data_in，然后直接解析就好了。
+ 参考：
+ * ATA/ATAPI Command Set - 3 (ACS-3), Section 7.18
+ * SATA AHCI HBA Spec, Section 5.3.7
+ * SCSI Command Reference Manual, Section 3.26
+ */
+ struct scsi_cdb16* cdb16 = (struct scsi_cdb16*)cmd_table->atapi_cmd;
+
+ sata_create_fis(cmd_fis, ATA_PACKET, 512 << 8, 0);
+ scsi_create_packet16(cdb16, SCSI_READ_CAPACITY_16, 0, 512);
+
+ cdb16->misc1 = 0x10; // service action
+ cmd_header->transferred_size = 0;
+ cmd_header->options |= HBA_CMDH_ATAPI;
+
+ port->regs[HBA_RPxCI] = (1 << slot);
+ wait_until(!(port->regs[HBA_RPxCI] & (1 << slot)));
+
+ if ((port->regs[HBA_RPxTFD] & HBA_PxTFD_ERR)) {
+ // 有错误
+ sata_read_error(port);
+ goto fail;
+ }
+
+ scsi_parse_capacity(port->device, (uint32_t*)data_in);
+
+done:
+ achi_register_ops(port);
+
+ vfree_dma(data_in);
+ vfree_dma(cmd_table);
+
+ return 1;
+
+fail:
+ vfree_dma(data_in);
+ vfree_dma(cmd_table);
+
+ return 0;
+}
+
+int
+ahci_identify_device(struct hba_port* port)
+{
+ // 用于重新识别设备（比如在热插拔的情况下）
+ vfree(port->device);
+ return ahci_init_device(port);
+}
+
+void
+achi_register_ops(struct hba_port* port)
+{
+ port->device->ops.identify = ahci_identify_device;
+ if (!(port->device->flags & HBA_DEV_FATAPI)) {
+ port->device->ops.read_buffer = sata_read_buffer;
+ port->device->ops.write_buffer = sata_write_buffer;
+ } else {
+ port->device->ops.read_buffer = scsi_read_buffer;
+ port->device->ops.write_buffer = scsi_write_buffer;
}
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff