Re: [SeaBIOS] [PATCH 6/6] Use timer_check() instead of using floppy_motor_counter in BDA for the timeout check in floppy_wait_irq()
This is the same as patch 7 from the previous series, except it also removes the line "SET_BDA(floppy_motor_counter, FLOPPY_MOTOR_TICKS);" from floppy_enable_controller(). Nikolay On Sun, 2018-02-04 at 17:27 +0200, Nikolay Nikolov wrote: > The problem with using floppy_motor_counter was that, after it > reaches 0, > it immediately stops the floppy motors, which is not what is supposed > to > happen on real hardware. Instead, after a timeout (like in the end of > every floppy operation, regardless of the result - success, timeout > or > error), the floppy motors must be kept spinning for additional 2 > seconds > (the FLOPPY_MOTOR_TICKS). So, now the floppy_motor_counter is > initialized > to 255 (the max value) in the beginning of the floppy operation (in > floppy_turn_on_motor()). For IRQ timeouts, a different timeout is > used, > specified by the new FLOPPY_IRQ_TIMEOUT constant (currently set to 5 > seconds - a fairly conservative value, but should work reliably on > most > floppies). > > After the floppy operation, floppy_turn_off_motor_delayed() resets > the > floppy_motor_counter to 2 seconds (FLOPPY_MOTOR_TICKS). > > This is also consistent with what other PC BIOSes do. > > Signed-off-by: Nikolay Nikolov > --- > src/hw/floppy.c | 9 + > 1 file changed, 5 insertions(+), 4 deletions(-) > > diff --git a/src/hw/floppy.c b/src/hw/floppy.c > index 77dbade..3012b3a 100644 > --- a/src/hw/floppy.c > +++ b/src/hw/floppy.c > @@ -34,6 +34,7 @@ > #define FLOPPY_GAPLEN 0x1B > #define FLOPPY_FORMAT_GAPLEN 0x6c > #define FLOPPY_PIO_TIMEOUT 1000 > +#define FLOPPY_IRQ_TIMEOUT 5000 > > #define FLOPPY_DOR_MOTOR_D 0x80 // Set to turn drive 3's motor > ON > #define FLOPPY_DOR_MOTOR_C 0x40 // Set to turn drive 2's motor > ON > @@ -221,8 +222,9 @@ floppy_wait_irq(void) > { > u8 frs = GET_BDA(floppy_recalibration_status); > SET_BDA(floppy_recalibration_status, frs & ~FRS_IRQ); > +u32 end = timer_calc(FLOPPY_IRQ_TIMEOUT); > for (;;) { > -if (!GET_BDA(floppy_motor_counter)) { > +if (timer_check(end)) { > warn_timeout(); > floppy_disable_controller(); > return DISK_RET_ETIMEOUT; > @@ -324,7 +326,6 @@ static int > floppy_enable_controller(void) > { > dprintf(2, "Floppy_enable_controller\n"); > -SET_BDA(floppy_motor_counter, FLOPPY_MOTOR_TICKS); > // Clear the reset bit (enter reset state), but set 'enable IRQ > and DMA' > floppy_dor_mask(FLOPPY_DOR_RESET, FLOPPY_DOR_IRQ); > // Set the reset bit (normal operation) and keep 'enable IRQ and > DMA' on > @@ -348,8 +349,8 @@ floppy_drive_pio(u8 floppyid, int command, u8 > *param) > return ret; > } > > -// reset the disk motor timeout value of INT 08 > -SET_BDA(floppy_motor_counter, FLOPPY_MOTOR_TICKS); > +// set the disk motor timeout value of INT 08 to the highest > value > +SET_BDA(floppy_motor_counter, 255); > > // Turn on motor of selected drive, DMA & int enabled, normal > operation > floppy_dor_write((floppyid ? FLOPPY_DOR_MOTOR_B : > FLOPPY_DOR_MOTOR_A) | FLOPPY_DOR_IRQ | FLOPPY_DOR_RESET | floppyid); ___ SeaBIOS mailing list SeaBIOS@seabios.org https://mail.coreboot.org/mailman/listinfo/seabios
[SeaBIOS] [PATCH 6/6] Use timer_check() instead of using floppy_motor_counter in BDA for the timeout check in floppy_wait_irq()
The problem with using floppy_motor_counter was that, after it reaches 0, it immediately stops the floppy motors, which is not what is supposed to happen on real hardware. Instead, after a timeout (like in the end of every floppy operation, regardless of the result - success, timeout or error), the floppy motors must be kept spinning for additional 2 seconds (the FLOPPY_MOTOR_TICKS). So, now the floppy_motor_counter is initialized to 255 (the max value) in the beginning of the floppy operation (in floppy_turn_on_motor()). For IRQ timeouts, a different timeout is used, specified by the new FLOPPY_IRQ_TIMEOUT constant (currently set to 5 seconds - a fairly conservative value, but should work reliably on most floppies). After the floppy operation, floppy_turn_off_motor_delayed() resets the floppy_motor_counter to 2 seconds (FLOPPY_MOTOR_TICKS). This is also consistent with what other PC BIOSes do. Signed-off-by: Nikolay Nikolov --- src/hw/floppy.c | 9 + 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/src/hw/floppy.c b/src/hw/floppy.c index 77dbade..3012b3a 100644 --- a/src/hw/floppy.c +++ b/src/hw/floppy.c @@ -34,6 +34,7 @@ #define FLOPPY_GAPLEN 0x1B #define FLOPPY_FORMAT_GAPLEN 0x6c #define FLOPPY_PIO_TIMEOUT 1000 +#define FLOPPY_IRQ_TIMEOUT 5000 #define FLOPPY_DOR_MOTOR_D 0x80 // Set to turn drive 3's motor ON #define FLOPPY_DOR_MOTOR_C 0x40 // Set to turn drive 2's motor ON @@ -221,8 +222,9 @@ floppy_wait_irq(void) { u8 frs = GET_BDA(floppy_recalibration_status); SET_BDA(floppy_recalibration_status, frs & ~FRS_IRQ); +u32 end = timer_calc(FLOPPY_IRQ_TIMEOUT); for (;;) { -if (!GET_BDA(floppy_motor_counter)) { +if (timer_check(end)) { warn_timeout(); floppy_disable_controller(); return DISK_RET_ETIMEOUT; @@ -324,7 +326,6 @@ static int floppy_enable_controller(void) { dprintf(2, "Floppy_enable_controller\n"); -SET_BDA(floppy_motor_counter, FLOPPY_MOTOR_TICKS); // Clear the reset bit (enter reset state), but set 'enable IRQ and DMA' floppy_dor_mask(FLOPPY_DOR_RESET, FLOPPY_DOR_IRQ); // Set the reset bit (normal operation) and keep 'enable IRQ and DMA' on @@ -348,8 +349,8 @@ floppy_drive_pio(u8 floppyid, int command, u8 *param) return ret; } -// reset the disk motor timeout value of INT 08 -SET_BDA(floppy_motor_counter, FLOPPY_MOTOR_TICKS); +// set the disk motor timeout value of INT 08 to the highest value +SET_BDA(floppy_motor_counter, 255); // Turn on motor of selected drive, DMA & int enabled, normal operation floppy_dor_write((floppyid ? FLOPPY_DOR_MOTOR_B : FLOPPY_DOR_MOTOR_A) | FLOPPY_DOR_IRQ | FLOPPY_DOR_RESET | floppyid); -- 2.14.3 ___ SeaBIOS mailing list SeaBIOS@seabios.org https://mail.coreboot.org/mailman/listinfo/seabios
[SeaBIOS] [PATCH 6/6] Use timer_check() instead of using floppy_motor_counter in BDA for the timeout check in floppy_wait_irq()
The problem with using floppy_motor_counter was that, after it reaches 0, it immediately stops the floppy motors, which is not what is supposed to happen on real hardware. Instead, after a timeout (like in the end of every floppy operation, regardless of the result - success, timeout or error), the floppy motors must be kept spinning for additional 2 seconds (the FLOPPY_MOTOR_TICKS). So, now the floppy_motor_counter is initialized to 255 (the max value) in the beginning of the floppy operation (in floppy_turn_on_motor()). For IRQ timeouts, a different timeout is used, specified by the new FLOPPY_IRQ_TIMEOUT constant (currently set to 5 seconds - a fairly conservative value, but should work reliably on most floppies). After the floppy operation, floppy_turn_off_motor_delayed() resets the floppy_motor_counter to 2 seconds (FLOPPY_MOTOR_TICKS). This is also consistent with what other PC BIOSes do. Signed-off-by: Nikolay Nikolov --- src/hw/floppy.c | 8 +--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/src/hw/floppy.c b/src/hw/floppy.c index acaff3f..6714402 100644 --- a/src/hw/floppy.c +++ b/src/hw/floppy.c @@ -34,6 +34,7 @@ #define FLOPPY_GAPLEN 0x1B #define FLOPPY_FORMAT_GAPLEN 0x6c #define FLOPPY_PIO_TIMEOUT 1000 +#define FLOPPY_IRQ_TIMEOUT 5000 #define FLOPPY_DOR_MOTOR_D 0x80 // Set to turn drive 3's motor ON #define FLOPPY_DOR_MOTOR_C 0x40 // Set to turn drive 2's motor ON @@ -221,8 +222,9 @@ floppy_wait_irq(void) { u8 frs = GET_BDA(floppy_recalibration_status); SET_BDA(floppy_recalibration_status, frs & ~FRS_IRQ); +u32 end = timer_calc(FLOPPY_IRQ_TIMEOUT); for (;;) { -if (!GET_BDA(floppy_motor_counter)) { +if (timer_check(end)) { warn_timeout(); floppy_disable_controller(); return DISK_RET_ETIMEOUT; @@ -340,8 +342,8 @@ floppy_enable_controller(void) static void floppy_turn_on_motor(u8 floppyid) { -// reset the disk motor timeout value of INT 08 -SET_BDA(floppy_motor_counter, FLOPPY_MOTOR_TICKS); +// set the disk motor timeout value of INT 08 to the highest value +SET_BDA(floppy_motor_counter, 255); // Turn on motor of selected drive, DMA & int enabled, normal operation floppy_dor_write((floppyid ? FLOPPY_DOR_MOTOR_B : FLOPPY_DOR_MOTOR_A) | FLOPPY_DOR_IRQ | FLOPPY_DOR_RESET | floppyid); -- 2.14.3 ___ SeaBIOS mailing list SeaBIOS@seabios.org https://mail.coreboot.org/mailman/listinfo/seabios