ata: pata_parport: fit3: implement IDE command set registers
fit3 protocol driver does not support accessing IDE control registers (device control/altstatus). The DOS driver does not use these registers either (as observed from DOSEMU trace). But the HW seems to be capable of accessing these registers - I simply tried bit 3 and it works! The control register is required to properly reset ATAPI devices or they will be detected only once (after a power cycle). Tested with EXP Computer CD-865 with MC-1285B EPP cable and TransDisk 3000. Signed-off-by: Ondrej Zary <linux@zary.sk> Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru> Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
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1 changed files with 2 additions and 12 deletions
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@ -9,11 +9,6 @@
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*
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*
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* The TD-2000 and certain older devices use a different protocol.
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* The TD-2000 and certain older devices use a different protocol.
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* Try the fit2 protocol module with them.
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* Try the fit2 protocol module with them.
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*
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* NB: The FIT adapters do not appear to support the control
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* registers. So, we map ALT_STATUS to STATUS and NO-OP writes
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* to the device control register - this means that IDE reset
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* will not work on these devices.
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*/
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*/
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#include <linux/module.h>
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#include <linux/module.h>
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@ -37,8 +32,7 @@
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static void fit3_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
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static void fit3_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
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{
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{
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if (cont == 1)
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regr += cont << 3;
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return;
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switch (pi->mode) {
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switch (pi->mode) {
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case 0:
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case 0:
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@ -59,11 +53,7 @@ static int fit3_read_regr(struct pi_adapter *pi, int cont, int regr)
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{
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{
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int a, b;
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int a, b;
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if (cont) {
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regr += cont << 3;
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if (regr != 6)
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return 0xff;
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regr = 7;
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}
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switch (pi->mode) {
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switch (pi->mode) {
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case 0:
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case 0:
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