This adds basic read/write support for SD cards emulated by QEMU.
This code is not expected to work on real hardware, because the
current controller and card initialization is not robust.
Signed-off-by: Kevin O'Connor <kevin(a)koconnor.net>
---
PCI SDHCI support was just added to QEMU git (qemu commit 224d10ff).
This SeaBIOS patch adds a very basic SeaBIOS driver for SD cards on
QEMU. One can test by adding "-device sdhci-pci -sd my-drive" to the
QEMU command line.
This patch is not related to the SD card patch sent to the seabios
mailing list back in June 2014. This patch implements a very simple
PIO mode driver.
---
Makefile | 2 +-
src/Kconfig | 6 ++
src/block.c | 5 +
src/block.h | 1 +
src/hw/sdcard.c | 321 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
src/post.c | 1 +
src/util.h | 4 +
7 files changed, 339 insertions(+), 1 deletion(-)
create mode 100644 src/hw/sdcard.c
diff --git a/Makefile b/Makefile
index 1cff1d0..a84a5f7 100644
--- a/Makefile
+++ b/Makefile
@@ -39,7 +39,7 @@ SRCBOTH=misc.c stacks.c output.c string.c block.c cdrom.c disk.c mouse.c kbd.c \
SRC16=$(SRCBOTH)
SRC32FLAT=$(SRCBOTH) post.c memmap.c malloc.c romfile.c x86.c optionroms.c \
pmm.c font.c boot.c bootsplash.c jpeg.c bmp.c \
- hw/ahci.c hw/pvscsi.c hw/usb-xhci.c hw/usb-hub.c \
+ hw/ahci.c hw/pvscsi.c hw/usb-xhci.c hw/usb-hub.c hw/sdcard.c \
fw/coreboot.c fw/lzmadecode.c fw/csm.c fw/biostables.c \
fw/paravirt.c fw/shadow.c fw/pciinit.c fw/smm.c fw/smp.c fw/mtrr.c fw/xen.c \
fw/acpi.c fw/mptable.c fw/pirtable.c fw/smbios.c fw/romfile_loader.c
diff --git a/src/Kconfig b/src/Kconfig
index a1c0c1e..45ca59c 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -159,6 +159,12 @@ menu "Hardware support"
default y
help
Support for AHCI disk code.
+ config SDCARD
+ depends on DRIVES && QEMU_HARDWARE
+ bool "SD controllers"
+ default y
+ help
+ Support for SD cards on PCI host controllers.
config VIRTIO_BLK
depends on DRIVES && QEMU_HARDWARE
bool "virtio-blk controllers"
diff --git a/src/block.c b/src/block.c
index 7892be5..c6d53c1 100644
--- a/src/block.c
+++ b/src/block.c
@@ -534,6 +534,11 @@ process_op(struct disk_op_s *op)
ret = call32(_cfunc32flat_process_atapi_op
, (u32)MAKE_FLATPTR(GET_SEG(SS), op), DISK_RET_EPARAM);
break;
+ case DTYPE_SDCARD: ;
+ extern void _cfunc32flat_process_sdcard_op(void);
+ ret = call32(_cfunc32flat_process_sdcard_op
+ , (u32)MAKE_FLATPTR(GET_SEG(SS), op), DISK_RET_EPARAM);
+ break;
case DTYPE_USB:
case DTYPE_UAS:
case DTYPE_VIRTIO_SCSI:
diff --git a/src/block.h b/src/block.h
index aa01ed7..8182288 100644
--- a/src/block.h
+++ b/src/block.h
@@ -71,6 +71,7 @@ struct drive_s {
#define DTYPE_ESP_SCSI 0x81
#define DTYPE_MEGASAS 0x82
#define DTYPE_PVSCSI 0x83
+#define DTYPE_SDCARD 0x90
#define MAXDESCSIZE 80
diff --git a/src/hw/sdcard.c b/src/hw/sdcard.c
new file mode 100644
index 0000000..6ff93c8
--- /dev/null
+++ b/src/hw/sdcard.c
@@ -0,0 +1,321 @@
+// PCI SD Host Controller Interface
+//
+// Copyright (C) 2014 Kevin O'Connor <kevin(a)koconnor.net>
+//
+// This file may be distributed under the terms of the GNU LGPLv3 license.
+
+#include "block.h" // struct drive_s
+#include "fw/paravirt.h" // runningOnQEMU
+#include "malloc.h" // malloc_fseg
+#include "output.h" // znprintf
+#include "pci.h" // pci_config_readl
+#include "pci_ids.h" // PCI_CLASS_SYSTEM_SDHCI
+#include "pci_regs.h" // PCI_BASE_ADDRESS_0
+#include "stacks.h" // wait_preempt
+#include "std/disk.h" // DISK_RET_SUCCESS
+#include "string.h" // memset
+#include "util.h" // boot_add_hd
+#include "x86.h" // writel
+
+// SDHCI MMIO registers
+struct sdhci_s {
+ u32 sdma_addr;
+ u16 block_size;
+ u16 block_count;
+ u32 arg;
+ u16 transfer_mode;
+ u16 cmd;
+ u32 response[4];
+ u32 data;
+ u32 present_state;
+ u8 host_control;
+ u8 power_control;
+ u8 block_gap_control;
+ u8 wakeup_control;
+ u16 clock_control;
+ u8 timeout_control;
+ u8 software_reset;
+ u16 irq_status;
+ u16 error_irq_status;
+ u16 irq_enable;
+ u16 error_irq_enable;
+ u16 irq_signal;
+ u16 error_signal;
+ u16 auto_cmd12;
+ u8 pad_3E[2];
+ u64 cap;
+ u64 max_current;
+ u16 force_auto_cmd12;
+ u16 force_error;
+ u8 adma_error;
+ u8 pad_55[3];
+ u64 adma_addr;
+ u8 pad_60[156];
+ u16 slot_irq;
+ u16 controller_version;
+} PACKED;
+
+// SDHCI commands
+#define SC_ALL_SEND_CID ((2<<8) | 0x21)
+#define SC_SEND_RELATIVE_ADDR ((3<<8) | 0x22)
+#define SC_SELECT_DESELECT_CARD ((7<<8) | 0x23)
+#define SC_READ_SINGLE ((17<<8) | 0x22)
+#define SC_READ_MULTIPLE ((18<<8) | 0x22)
+#define SC_WRITE_SINGLE ((24<<8) | 0x22)
+#define SC_WRITE_MULTIPLE ((25<<8) | 0x22)
+#define SC_APP_CMD ((55<<8) | 0x22)
+#define SC_APP_SEND_OP_COND ((41<<8) | 0x22)
+
+// SDHCI irqs
+#define SI_CMD_COMPLETE (1<<0)
+#define SI_TRANS_DONE (1<<1)
+#define SI_WRITE_READY (1<<4)
+#define SI_READ_READY (1<<5)
+
+// SDHCI present_state flags
+#define SP_CMD_INHIBIT (1<<0)
+#define SP_DAT_INHIBIT (1<<1)
+
+// SDHCI transfer_mode flags
+#define ST_BLOCKCOUNT (1<<1)
+#define ST_AUTO_CMD12 (1<<2)
+#define ST_READ (1<<4)
+#define ST_MULTIPLE (1<<5)
+
+// SDHCI result flags
+#define SR_OCR_CCS (1<<30)
+
+// SDHCI timeouts
+#define SDHCI_PIO_TIMEOUT 1000 // XXX - these are just made up
+#define SDHCI_TRANSFER_TIMEOUT 10000
+
+// Internal 'struct drive_s' storage for a detected card
+struct sddrive_s {
+ struct drive_s drive;
+ struct sdhci_s *regs;
+ int card_type;
+};
+
+// SD card types
+#define SF_MMC 0
+#define SF_SDSC 1
+#define SF_SDHC 2
+
+// Repeatedly read a u16 register until the specific value is found
+static int
+waitw(u16 *reg, u16 mask, u16 value, u32 end)
+{
+ for (;;) {
+ u16 v = readw(reg);
+ if ((v & mask) == value)
+ return 0;
+ if (timer_check(end)) {
+ warn_timeout();
+ return -1;
+ }
+ yield();
+ }
+}
+
+// Send a command to the card.
+static int
+sdcard_pio(struct sdhci_s *regs, int cmd, u32 *param)
+{
+ u32 end = timer_calc(SDHCI_PIO_TIMEOUT);
+ u16 busyf = SP_CMD_INHIBIT | ((cmd & 0x03) == 0x03 ? SP_DAT_INHIBIT : 0);
+ int ret = waitw((u16*)®s->present_state, busyf, 0, end);
+ if (ret)
+ return ret;
+ // Send command
+ writel(®s->arg, *param);
+ writew(®s->cmd, cmd);
+ ret = waitw(®s->irq_status, SI_CMD_COMPLETE, SI_CMD_COMPLETE, end);
+ if (ret)
+ return ret;
+ writew(®s->irq_status, SI_CMD_COMPLETE);
+ // Read response
+ memcpy(param, regs->response, sizeof(regs->response));
+ return 0;
+}
+
+// Send an "app specific" command to the card.
+static int
+sdcard_pio_app(struct sdhci_s *regs, int cmd, u32 *param)
+{
+ u32 aparam[4] = {};
+ int ret = sdcard_pio(regs, SC_APP_CMD, aparam);
+ if (ret)
+ return ret;
+ return sdcard_pio(regs, cmd, param);
+}
+
+// Send a command to the card which transfers data.
+static int
+sdcard_pio_transfer(struct sddrive_s *drive, int cmd, u32 addr
+ , void *data, int count)
+{
+ // Send command
+ writel(&drive->regs->block_size, DISK_SECTOR_SIZE);
+ writew(&drive->regs->block_count, count); // XXX - SC_SET_BLOCK_COUNT?
+ int isread = cmd != SC_WRITE_SINGLE && cmd != SC_WRITE_MULTIPLE;
+ u16 tmode = ((count > 1 ? ST_MULTIPLE|ST_AUTO_CMD12|ST_BLOCKCOUNT : 0)
+ | (isread ? ST_READ : 0));
+ writew(&drive->regs->transfer_mode, tmode);
+ if (drive->card_type < SF_SDHC)
+ addr *= DISK_SECTOR_SIZE;
+ u32 param[4] = { addr };
+ int ret = sdcard_pio(drive->regs, cmd, param);
+ if (ret)
+ return ret;
+ // Read/write data
+ u32 end = timer_calc(SDHCI_TRANSFER_TIMEOUT);
+ u16 cbit = isread ? SI_READ_READY : SI_WRITE_READY;
+ while (count--) {
+ ret = waitw(&drive->regs->irq_status, cbit, cbit, end);
+ if (ret)
+ return ret;
+ writew(&drive->regs->irq_status, cbit);
+ int i;
+ for (i=0; i<DISK_SECTOR_SIZE/4; i++) {
+ if (isread)
+ *(u32*)data = readl(&drive->regs->data);
+ else
+ writel(&drive->regs->data, *(u32*)data);
+ data += 4;
+ }
+ }
+ // Complete command
+ // XXX - SC_STOP_TRANSMISSION?
+ ret = waitw(&drive->regs->irq_status, SI_TRANS_DONE, SI_TRANS_DONE, end);
+ if (ret)
+ return ret;
+ writew(&drive->regs->irq_status, SI_TRANS_DONE);
+ return 0;
+}
+
+// Read/write a block of data to/from the card.
+static int
+sdcard_readwrite(struct disk_op_s *op, int iswrite)
+{
+ struct sddrive_s *drive = container_of(
+ op->drive_gf, struct sddrive_s, drive);
+ int cmd = iswrite ? SC_WRITE_SINGLE : SC_READ_SINGLE;
+ if (op->count > 1)
+ cmd = iswrite ? SC_WRITE_MULTIPLE : SC_READ_MULTIPLE;
+ int ret = sdcard_pio_transfer(drive, cmd, op->lba, op->buf_fl, op->count);
+ if (ret)
+ return DISK_RET_EBADTRACK;
+ return DISK_RET_SUCCESS;
+}
+
+int VISIBLE32FLAT
+process_sdcard_op(struct disk_op_s *op)
+{
+ if (!CONFIG_SDCARD)
+ return 0;
+ switch (op->command) {
+ case CMD_READ:
+ return sdcard_readwrite(op, 0);
+ case CMD_WRITE:
+ return sdcard_readwrite(op, 1);
+ case CMD_FORMAT:
+ case CMD_RESET:
+ case CMD_ISREADY:
+ case CMD_VERIFY:
+ case CMD_SEEK:
+ return DISK_RET_SUCCESS;
+ default:
+ return DISK_RET_EPARAM;
+ }
+}
+
+
+/****************************************************************
+ * Setup
+ ****************************************************************/
+
+// Initialize an SD card
+static int
+sdcard_card_setup(struct sdhci_s *regs)
+{
+ // XXX - works on QEMU; probably wont on real hardware!
+ u32 param[4] = { 0x01 };
+ int ret = sdcard_pio_app(regs, SC_APP_SEND_OP_COND, param);
+ if (ret)
+ return ret;
+ int card_type = (param[0] & SR_OCR_CCS) ? SF_SDHC : SF_SDSC;
+ param[0] = 0x00;
+ ret = sdcard_pio(regs, SC_ALL_SEND_CID, param);
+ if (ret)
+ return ret;
+ param[0] = 0x01 << 16;
+ ret = sdcard_pio(regs, SC_SEND_RELATIVE_ADDR, param);
+ if (ret)
+ return ret;
+ u16 rca = param[0] >> 16;
+ param[0] = rca << 16;
+ ret = sdcard_pio(regs, SC_SELECT_DESELECT_CARD, param);
+ if (ret)
+ return ret;
+ return card_type;
+}
+
+// Setup and configure an SD card controller
+static void
+sdcard_controller_setup(void *data)
+{
+ struct pci_device *pci = data;
+ u16 bdf = pci->bdf;
+ wait_preempt(); // Avoid pci_config_readl when preempting
+ struct sdhci_s *regs = (void*)pci_config_readl(bdf, PCI_BASE_ADDRESS_0);
+ pci_config_maskw(bdf, PCI_COMMAND, 0,
+ PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+
+ // Initialize controller
+ if (!runningOnQEMU())
+ // XXX - this init logic will probably only work on qemu!
+ return;
+ writew(®s->irq_signal, 0);
+ writew(®s->irq_enable, 0xffff);
+ writew(®s->error_signal, 0);
+ writeb(®s->power_control, 0x0f);
+ writew(®s->clock_control, 0x0005);
+
+ // Initialize card
+ int card_type = sdcard_card_setup(regs);
+ if (card_type < 0)
+ return;
+
+ // Register drive
+ struct sddrive_s *drive = malloc_fseg(sizeof(*drive));
+ if (!drive) {
+ warn_noalloc();
+ return;
+ }
+ memset(drive, 0, sizeof(*drive));
+ drive->drive.type = DTYPE_SDCARD;
+ drive->drive.blksize = DISK_SECTOR_SIZE;
+ drive->drive.sectors = (u64)-1; // XXX
+ drive->regs = regs;
+ drive->card_type = card_type;
+
+ dprintf(1, "Found SD Card at %02x:%02x.%x\n"
+ , pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf));
+ char *desc = znprintf(MAXDESCSIZE, "SD Card"); // XXX
+ boot_add_hd(&drive->drive, desc, bootprio_find_pci_device(pci));
+}
+
+void
+sdcard_setup(void)
+{
+ if (!CONFIG_SDCARD)
+ return;
+
+ struct pci_device *pci;
+ foreachpci(pci) {
+ if (pci->class != PCI_CLASS_SYSTEM_SDHCI || pci->prog_if >= 2)
+ // Not an SDHCI controller following SDHCI spec
+ continue;
+ run_thread(sdcard_controller_setup, pci);
+ }
+}
diff --git a/src/post.c b/src/post.c
index 0fdd28e..9ea5620 100644
--- a/src/post.c
+++ b/src/post.c
@@ -143,6 +143,7 @@ device_hardware_setup(void)
floppy_setup();
ata_setup();
ahci_setup();
+ sdcard_setup();
cbfs_payload_setup();
ramdisk_setup();
virtio_blk_setup();
diff --git a/src/util.h b/src/util.h
index ed90e03..09bb8a9 100644
--- a/src/util.h
+++ b/src/util.h
@@ -146,6 +146,10 @@ void floppy_tick(void);
void ramdisk_setup(void);
int process_ramdisk_op(struct disk_op_s *op);
+// hw/sdcard.c
+int process_sdcard_op(struct disk_op_s *op);
+void sdcard_setup(void);
+
// hw/timer.c
void timer_setup(void);
void pmtimer_setup(u16 ioport);
--
1.9.3
