diff options
Diffstat (limited to 'drivers/ata/pata_parport/ktti.c')
-rw-r--r-- | drivers/ata/pata_parport/ktti.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/ata/pata_parport/ktti.c b/drivers/ata/pata_parport/ktti.c new file mode 100644 index 0000000000..c078d19348 --- /dev/null +++ b/drivers/ata/pata_parport/ktti.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * (c) 1998 Grant R. Guenther <grant@torque.net> + * + * ktti.c is a low-level protocol driver for the KT Technology + * parallel port adapter. This adapter is used in the "PHd" + * portable hard-drives. As far as I can tell, this device + * supports 4-bit mode _only_. +*/ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/wait.h> +#include <asm/io.h> +#include "pata_parport.h" + +#define j44(a, b) (((a >> 4) & 0x0f) | (b & 0xf0)) + +/* + * cont = 0 - access the IDE register file + * cont = 1 - access the IDE command set + */ +static int cont_map[2] = { 0x10, 0x08 }; + +static void ktti_write_regr(struct pi_adapter *pi, int cont, int regr, int val) +{ + int r = regr + cont_map[cont]; + + w0(r); w2(0xb); w2(0xa); w2(3); w2(6); + w0(val); w2(3); w0(0); w2(6); w2(0xb); +} + +static int ktti_read_regr(struct pi_adapter *pi, int cont, int regr) +{ + int a, b, r; + + r = regr + cont_map[cont]; + + w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9); + a = r1(); w2(0xc); b = r1(); w2(9); w2(0xc); w2(9); + return j44(a, b); +} + +static void ktti_read_block(struct pi_adapter *pi, char *buf, int count) +{ + int k, a, b; + + for (k = 0; k < count / 2; k++) { + w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9); + a = r1(); w2(0xc); b = r1(); w2(9); + buf[2*k] = j44(a, b); + a = r1(); w2(0xc); b = r1(); w2(9); + buf[2*k+1] = j44(a, b); + } +} + +static void ktti_write_block(struct pi_adapter *pi, char *buf, int count) +{ + int k; + + for (k = 0; k < count / 2; k++) { + w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6); + w0(buf[2 * k]); w2(3); + w0(buf[2 * k + 1]); w2(6); + w2(0xb); + } +} + +static void ktti_connect(struct pi_adapter *pi) +{ + pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + w2(0xb); w2(0xa); w0(0); w2(3); w2(6); +} + +static void ktti_disconnect(struct pi_adapter *pi) +{ + w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4); + w0(pi->saved_r0); + w2(pi->saved_r2); +} + +static void ktti_log_adapter(struct pi_adapter *pi) +{ + dev_info(&pi->dev, "KT adapter at 0x%x, delay %d\n", + pi->port, pi->delay); +} + +static struct pi_protocol ktti = { + .owner = THIS_MODULE, + .name = "ktti", + .max_mode = 1, + .epp_first = 2, + .default_delay = 1, + .max_units = 1, + .write_regr = ktti_write_regr, + .read_regr = ktti_read_regr, + .write_block = ktti_write_block, + .read_block = ktti_read_block, + .connect = ktti_connect, + .disconnect = ktti_disconnect, + .log_adapter = ktti_log_adapter, +}; + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>"); +MODULE_DESCRIPTION("KT Technology parallel port IDE adapter protocol driver"); +module_pata_parport_driver(ktti); |