diff options
Diffstat (limited to 'hw/ast-bmc/ast-io.c')
| -rw-r--r-- | hw/ast-bmc/ast-io.c | 63 |
1 files changed, 61 insertions, 2 deletions
diff --git a/hw/ast-bmc/ast-io.c b/hw/ast-bmc/ast-io.c index a5528716..eb80181e 100644 --- a/hw/ast-bmc/ast-io.c +++ b/hw/ast-bmc/ast-io.c @@ -119,6 +119,17 @@ #define BMC_SIO_SCR29_MBOX 0x08 #define BMC_SIO_SCR29_MEMBOOT 0x10 +/* + * SIO Register 0x2d: Platform Flags (normal bit ordering) + * + * [ 7 ] Hostboot configures SUART + * [ 6 ] Hostboot configures VUART + * [5:1] Reserved + * [ 0 ] Isolate Service Processor + */ +#define BMC_SIO_PLAT_FLAGS 0x2d +#define BMC_SIO_PLAT_ISOLATE_SP 0x01 + enum { BMC_SIO_DEV_NONE = -1, BMC_SIO_DEV_UART1 = 2, @@ -310,10 +321,58 @@ static void ast_setup_sio_irq_polarity(void) bmc_sio_put(true); } -void ast_io_init(void) +static bool ast_sio_is_enabled(void) +{ + bool enabled; + + lpc_outb(0xa5, 0x2e); + lpc_outb(0xa5, 0x2e); + + /* Heuristic attempt to confirm SIO is enabled. + * + * Do two tests of 1 byte, giving a false positive probability of + * 1/65536. Read tests on disabled SIO tended to return 0x60. + */ + bmc_sio_outb(0x2, 0x07); + enabled = bmc_sio_inb(0x07) == 2; + if (enabled) { + bmc_sio_outb(0xd, 0x07); + enabled = bmc_sio_inb(0x07) == 0xd; + } + + if (enabled) + lpc_outb(0xaa, 0x2e); + + return enabled; +} + +bool ast_sio_init(void) { + bool enabled = ast_sio_is_enabled(); + + prlog(PR_NOTICE, "PLAT: SuperIO is %s\n", + enabled ? "available" : "unavailable!"); + /* Configure all AIO interrupts to level low */ - ast_setup_sio_irq_polarity(); + if (enabled) + ast_setup_sio_irq_polarity(); + + return enabled; +} + +bool ast_can_isolate_sp(void) +{ + return bmc_sio_inb(BMC_SIO_PLAT_FLAGS) & BMC_SIO_PLAT_ISOLATE_SP; +} + +bool ast_io_is_rw(void) +{ + return !(ast_ahb_readl(LPC_HICRB) & LPC_HICRB_ILPC_DISABLE); +} + +bool ast_io_init(void) +{ + return ast_io_is_rw(); } bool ast_lpc_fw_is_mbox(void) |
