diff options
Diffstat (limited to 'drivers/ata/pata_parport/aten.c')
-rw-r--r-- | drivers/ata/pata_parport/aten.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/drivers/ata/pata_parport/aten.c b/drivers/ata/pata_parport/aten.c new file mode 100644 index 0000000000..620ce6c8da --- /dev/null +++ b/drivers/ata/pata_parport/aten.c @@ -0,0 +1,144 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * (c) 1997-8 Grant R. Guenther <grant@torque.net> + * + * aten.c is a low-level protocol driver for the ATEN EH-100 + * parallel port adapter. The EH-100 supports 4-bit and 8-bit + * modes only. There is also an EH-132 which supports EPP mode + * transfers. The EH-132 is not yet supported. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/wait.h> +#include <linux/types.h> +#include <asm/io.h> +#include "pata_parport.h" + +#define j44(a,b) ((((a>>4)&0x0f)|(b&0xf0))^0x88) + +/* + * cont = 0 - access the IDE register file + * cont = 1 - access the IDE command set + */ +static int cont_map[2] = { 0x08, 0x20 }; + +static void aten_write_regr(struct pi_adapter *pi, int cont, int regr, int val) +{ + int r = regr + cont_map[cont] + 0x80; + + w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc); +} + +static int aten_read_regr(struct pi_adapter *pi, int cont, int regr) +{ + int a, b, r; + + r = regr + cont_map[cont] + 0x40; + + switch (pi->mode) { + + case 0: + w0(r); w2(0xe); w2(6); + w2(7); w2(6); w2(0); + a = r1(); w0(0x10); b = r1(); w2(0xc); + return j44(a,b); + + case 1: + r |= 0x10; + w0(r); w2(0xe); w2(6); w0(0xff); + w2(0x27); w2(0x26); w2(0x20); + a = r0(); + w2(0x26); w2(0xc); + return a; + } + return -1; +} + +static void aten_read_block(struct pi_adapter *pi, char *buf, int count) +{ + int k, a, b, c, d; + + switch (pi->mode) { + + case 0: + w0(0x48); w2(0xe); w2(6); + for (k = 0; k < count / 2; k++) { + w2(7); w2(6); w2(2); + a = r1(); w0(0x58); b = r1(); + w2(0); d = r1(); w0(0x48); c = r1(); + buf[2 * k] = j44(c, d); + buf[2 * k + 1] = j44(a, b); + } + w2(0xc); + break; + + case 1: + w0(0x58); w2(0xe); w2(6); + for (k = 0; k < count / 2; k++) { + w2(0x27); w2(0x26); w2(0x22); + a = r0(); w2(0x20); b = r0(); + buf[2 * k] = b; + buf[2 * k + 1] = a; + } + w2(0x26); w2(0xc); + break; + } +} + +static void aten_write_block(struct pi_adapter *pi, char *buf, int count) +{ + int k; + + w0(0x88); w2(0xe); w2(6); + for (k = 0; k < count / 2; k++) { + w0(buf[2 * k + 1]); w2(0xe); w2(6); + w0(buf[2 * k]); w2(7); w2(6); + } + w2(0xc); +} + +static void aten_connect(struct pi_adapter *pi) +{ + pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + w2(0xc); +} + +static void aten_disconnect(struct pi_adapter *pi) +{ + w0(pi->saved_r0); + w2(pi->saved_r2); +} + +static void aten_log_adapter(struct pi_adapter *pi) +{ + char *mode_string[2] = { "4-bit", "8-bit" }; + + dev_info(&pi->dev, + "ATEN EH-100 at 0x%x, mode %d (%s), delay %d\n", + pi->port, pi->mode, mode_string[pi->mode], pi->delay); +} + +static struct pi_protocol aten = { + .owner = THIS_MODULE, + .name = "aten", + .max_mode = 2, + .epp_first = 2, + .default_delay = 1, + .max_units = 1, + .write_regr = aten_write_regr, + .read_regr = aten_read_regr, + .write_block = aten_write_block, + .read_block = aten_read_block, + .connect = aten_connect, + .disconnect = aten_disconnect, + .log_adapter = aten_log_adapter, +}; + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>"); +MODULE_DESCRIPTION("ATEN EH-100 parallel port IDE adapter protocol driver"); +module_pata_parport_driver(aten); |