The Aspeed SMC controllers have a mode (Command mode) in which
accesses to the flash content are no different than doing MMIOs. The
controller generates all the necessary commands to load (or store)
data in memory.
However, accesses are restricted to the segment window assigned the
the flash module by the controller. This window is defined by the
Segment Address Register.
Signed-off-by: Cédric Le Goater <c...@kaod.org>
Reviewed-by: Andrew Jeffery <and...@aj.id.au>
---
hw/ssi/aspeed_smc.c | 174 ++++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 162 insertions(+), 12 deletions(-)
diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
index 72a44150b0a1..eec087199a22 100644
--- a/hw/ssi/aspeed_smc.c
+++ b/hw/ssi/aspeed_smc.c
@@ -69,6 +69,7 @@
#define R_CTRL0 (0x10 / 4)
#define CTRL_CMD_SHIFT 16
#define CTRL_CMD_MASK 0xff
+#define CTRL_AST2400_SPI_4BYTE (1 << 13)
#define CTRL_CE_STOP_ACTIVE (1 << 2)
#define CTRL_CMD_MODE_MASK 0x3
#define CTRL_READMODE 0x0
@@ -135,6 +136,16 @@
#define ASPEED_SOC_SPI_FLASH_BASE 0x30000000
#define ASPEED_SOC_SPI2_FLASH_BASE 0x38000000
+/* Flash opcodes. */
+#define SPI_OP_READ 0x03 /* Read data bytes (low frequency) */
+#define SPI_OP_WRDI 0x04 /* Write disable */
+#define SPI_OP_RDSR 0x05 /* Read status register */
+#define SPI_OP_WREN 0x06 /* Write enable */
+
+/* Used for Macronix and Winbond flashes. */
+#define SPI_OP_EN4B 0xb7 /* Enter 4-byte mode */
+#define SPI_OP_EX4B 0xe9 /* Exit 4-byte mode */
+
/*
* Default segments mapping addresses and size for each slave per
* controller. These can be changed when board is initialized with the
@@ -357,6 +368,98 @@ static inline bool aspeed_smc_is_writable(const
AspeedSMCFlash *fl)
return s->regs[s->r_conf] & (1 << (s->conf_enable_w0 + fl->id));
}
+static inline int aspeed_smc_flash_cmd(const AspeedSMCFlash *fl)
+{
+ AspeedSMCState *s = fl->controller;
+ int cmd = (s->regs[s->r_ctrl0 + fl->id] >> CTRL_CMD_SHIFT) & CTRL_CMD_MASK;
+
+ /* This is the default value for read mode. In other modes, the
+ * command should be defined */
+ if (aspeed_smc_flash_mode(fl) == CTRL_READMODE) {
+ cmd = SPI_OP_READ;
+ }
+
+ if (!cmd) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: no command defined for mode %d\n",
+ __func__, aspeed_smc_flash_mode(fl));
+ }
+
+ return cmd;
+}
+
+static inline int aspeed_smc_flash_is_4byte(const AspeedSMCFlash *fl)
+{
+ AspeedSMCState *s = fl->controller;
+
+ if (s->ctrl->segments == aspeed_segments_spi) {
+ return s->regs[s->r_ctrl0] & CTRL_AST2400_SPI_4BYTE;
+ } else {
+ return s->regs[s->r_ce_ctrl] & (1 << (CTRL_EXTENDED0 + fl->id));
+ }
+}
+
+static void aspeed_smc_flash_select(const AspeedSMCFlash *fl)
+{
+ AspeedSMCState *s = fl->controller;
+
+ s->regs[s->r_ctrl0 + fl->id] &= ~CTRL_CE_STOP_ACTIVE;
+ qemu_set_irq(s->cs_lines[fl->id], aspeed_smc_is_ce_stop_active(fl));
+}
+
+static void aspeed_smc_flash_unselect(const AspeedSMCFlash *fl)
+{
+ AspeedSMCState *s = fl->controller;
+
+ s->regs[s->r_ctrl0 + fl->id] |= CTRL_CE_STOP_ACTIVE;
+ qemu_set_irq(s->cs_lines[fl->id], aspeed_smc_is_ce_stop_active(fl));
+}
+
+static uint32_t aspeed_smc_check_segment_addr(AspeedSMCFlash *fl, uint32_t
addr)
+{
+ AspeedSMCState *s = fl->controller;
+ AspeedSegments seg;
+
+ aspeed_smc_reg_to_segment(s->regs[R_SEG_ADDR0 + fl->id], &seg);
+ if ((addr & (seg.size - 1)) != addr) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: invalid address 0x%08x for CS%d segment : "
+ "[ 0x%"HWADDR_PRIx" - 0x%"HWADDR_PRIx" ]\n",
+ s->ctrl->name, addr, fl->id, seg.addr,
+ seg.addr + seg.size);
+ }
+
+ addr &= seg.size - 1;
+ return addr;
+}
+
+static void aspeed_smc_flash_setup_read(AspeedSMCFlash *fl, uint32_t addr)
+{
+ AspeedSMCState *s = fl->controller;
+ uint8_t cmd = aspeed_smc_flash_cmd(fl);
+
+ /*
+ * To be checked: I am not sure the Aspeed SPI controller needs to
+ * enable writes when running in READ/FREAD command mode
+ */
+
+ /* access can not exceed CS segment */
+ addr = aspeed_smc_check_segment_addr(fl, addr);
+
+ /* TODO: do we have to send 4BYTE each time ? */
+ if (aspeed_smc_flash_is_4byte(fl)) {
+ ssi_transfer(s->spi, SPI_OP_EN4B);
+ }
+
+ ssi_transfer(s->spi, cmd);
+
+ if (aspeed_smc_flash_is_4byte(fl)) {
+ ssi_transfer(s->spi, (addr >> 24) & 0xff);
+ }
+ ssi_transfer(s->spi, (addr >> 16) & 0xff);
+ ssi_transfer(s->spi, (addr >> 8) & 0xff);
+ ssi_transfer(s->spi, (addr & 0xff));
+}
+
static uint64_t aspeed_smc_flash_read(void *opaque, hwaddr addr, unsigned size)
{
AspeedSMCFlash *fl = opaque;
@@ -364,19 +467,55 @@ static uint64_t aspeed_smc_flash_read(void *opaque,
hwaddr addr, unsigned size)
uint64_t ret = 0;
int i;
- if (aspeed_smc_is_usermode(fl)) {
+ switch (aspeed_smc_flash_mode(fl)) {
+ case CTRL_USERMODE:
for (i = 0; i < size; i++) {
ret |= ssi_transfer(s->spi, 0x0) << (8 * i);
}
- } else {
- qemu_log_mask(LOG_UNIMP, "%s: usermode not implemented\n",
- __func__);
- ret = -1;
+ break;
+ case CTRL_READMODE:
+ case CTRL_FREADMODE:
+ aspeed_smc_flash_select(fl);
+ aspeed_smc_flash_setup_read(fl, addr);
+
+ for (i = 0; i < size; i++) {
+ ret |= ssi_transfer(s->spi, 0x0) << (8 * i);
+ }
+
+ aspeed_smc_flash_unselect(fl);
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid flash mode %d\n",
+ __func__, aspeed_smc_flash_mode(fl));
}
return ret;
}
+static void aspeed_smc_flash_setup_write(AspeedSMCFlash *fl, uint32_t addr)
+{
+ AspeedSMCState *s = fl->controller;
+ uint8_t cmd = aspeed_smc_flash_cmd(fl);
+
+ /* Flash access can not exceed CS segment */
+ addr = aspeed_smc_check_segment_addr(fl, addr);
+
+ /* TODO: do we have to send 4BYTE each time ? */
+ if (aspeed_smc_flash_is_4byte(fl)) {
+ ssi_transfer(s->spi, SPI_OP_EN4B);
+ }
+
+ ssi_transfer(s->spi, SPI_OP_WREN);
+ ssi_transfer(s->spi, cmd);
+
+ if (aspeed_smc_flash_is_4byte(fl)) {
+ ssi_transfer(s->spi, (addr >> 24) & 0xff);
+ }
+ ssi_transfer(s->spi, (addr >> 16) & 0xff);
+ ssi_transfer(s->spi, (addr >> 8) & 0xff);
+ ssi_transfer(s->spi, (addr & 0xff));
+}
+
static void aspeed_smc_flash_write(void *opaque, hwaddr addr, uint64_t data,
unsigned size)
{
@@ -390,14 +529,25 @@ static void aspeed_smc_flash_write(void *opaque, hwaddr
addr, uint64_t data,
return;
}
- if (!aspeed_smc_is_usermode(fl)) {
- qemu_log_mask(LOG_UNIMP, "%s: usermode not implemented\n",
- __func__);
- return;
- }
+ switch (aspeed_smc_flash_mode(fl)) {
+ case CTRL_USERMODE:
+ for (i = 0; i < size; i++) {
+ ssi_transfer(s->spi, (data >> (8 * i)) & 0xff);
+ }
+ break;
+ case CTRL_WRITEMODE:
+ aspeed_smc_flash_select(fl);
+ aspeed_smc_flash_setup_write(fl, addr);
+
+ for (i = 0; i < size; i++) {
+ ssi_transfer(s->spi, (data >> (8 * i)) & 0xff);
+ }
- for (i = 0; i < size; i++) {
- ssi_transfer(s->spi, (data >> (8 * i)) & 0xff);
+ aspeed_smc_flash_unselect(fl);
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid flash mode %d\n",
+ __func__, aspeed_smc_flash_mode(fl));
}
}
--
2.7.4
