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aspeed/smc: handle SPI flash Command mode 

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 <clg@kaod.org>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Message-id: 1483979087-32663-8-git-send-email-clg@kaod.org
[PMM: Deleted now-unused aspeed_smc_is_usermode() function]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Cédric Le Goater 2017-01-20 11:15:08 +00:00 committed by Peter Maydell
parent 087b57c993
commit fcdf2c5945
2 changed files with 132 additions and 27 deletions
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157
hw/ssi/aspeed_smc.c
View File

@ -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
@ -138,6 +139,9 @@
#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) */
/*
* Default segments mapping addresses and size for each slave per
* controller. These can be changed when board is initialized with the
@ -402,11 +406,6 @@ static inline int aspeed_smc_flash_mode(const AspeedSMCFlash *fl)
return s->regs[s->r_ctrl0 + fl->id] & CTRL_CMD_MODE_MASK;
}
static inline bool aspeed_smc_is_usermode(const AspeedSMCFlash *fl)
{
return aspeed_smc_flash_mode(fl) == CTRL_USERMODE;
}
static inline bool aspeed_smc_is_writable(const AspeedSMCFlash *fl)
{
const AspeedSMCState *s = fl->controller;
@ -414,21 +413,123 @@ 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)
{
const AspeedSMCState *s = fl->controller;
int cmd = (s->regs[s->r_ctrl0 + fl->id] >> CTRL_CMD_SHIFT) & CTRL_CMD_MASK;
/* In read mode, the default SPI command is READ (0x3). In other
* modes, the command should necessarily 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)
{
const 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 inline bool aspeed_smc_is_ce_stop_active(const AspeedSMCFlash *fl)
{
const AspeedSMCState *s = fl->controller;
return s->regs[s->r_ctrl0 + fl->id] & CTRL_CE_STOP_ACTIVE;
}
static void aspeed_smc_flash_select(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(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(const AspeedSMCFlash *fl,
uint32_t addr)
{
const 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_send_addr(AspeedSMCFlash *fl, uint32_t addr)
{
const 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);
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;
const AspeedSMCState *s = fl->controller;
AspeedSMCState *s = fl->controller;
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_send_addr(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;
@ -438,7 +539,7 @@ static void aspeed_smc_flash_write(void *opaque, hwaddr addr, uint64_t data,
unsigned size)
{
AspeedSMCFlash *fl = opaque;
const AspeedSMCState *s = fl->controller;
AspeedSMCState *s = fl->controller;
int i;
if (!aspeed_smc_is_writable(fl)) {
@ -447,14 +548,25 @@ 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_send_addr(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));
}
}
@ -468,13 +580,6 @@ static const MemoryRegionOps aspeed_smc_flash_ops = {
},
};
static inline bool aspeed_smc_is_ce_stop_active(const AspeedSMCFlash *fl)
{
const AspeedSMCState *s = fl->controller;
return s->regs[s->r_ctrl0 + fl->id] & CTRL_CE_STOP_ACTIVE;
}
static void aspeed_smc_flash_update_cs(AspeedSMCFlash *fl)
{
const AspeedSMCState *s = fl->controller;

2
include/hw/ssi/aspeed_smc.h
View File

@ -49,7 +49,7 @@ typedef struct AspeedSMCController {
} AspeedSMCController;
typedef struct AspeedSMCFlash {
const struct AspeedSMCState *controller;
struct AspeedSMCState *controller;
uint8_t id;
uint32_t size;