diff options
Diffstat (limited to 'drivers/ata/pata_parport/fit2.c')
| -rw-r--r-- | drivers/ata/pata_parport/fit2.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/ata/pata_parport/fit2.c b/drivers/ata/pata_parport/fit2.c new file mode 100644 index 0000000000..de79cf91ad --- /dev/null +++ b/drivers/ata/pata_parport/fit2.c @@ -0,0 +1,138 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * (c) 1998 Grant R. Guenther <grant@torque.net> + * + * fit2.c is a low-level protocol driver for the older version + * of the Fidelity International Technology parallel port adapter. + * This adapter is used in their TransDisk 2000 and older TransDisk + * 3000 portable hard-drives. As far as I can tell, this device + * supports 4-bit mode _only_. + * + * Newer models of the FIT products use an enhanced protocol. + * The "fit3" protocol module should support current drives. + */ + +#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 + * + * NB: The FIT adapter does not appear to use the control registers. + * So, we map ALT_STATUS to STATUS and NO-OP writes to the device + * control register - this means that IDE reset will not work on these + * devices. + */ + +static void fit2_write_regr(struct pi_adapter *pi, int cont, int regr, int val) +{ + if (cont == 1) + return; + w2(0xc); w0(regr); w2(4); w0(val); w2(5); w0(0); w2(4); +} + +static int fit2_read_regr(struct pi_adapter *pi, int cont, int regr) +{ + int a, b, r; + + if (cont) { + if (regr != 6) + return 0xff; + r = 7; + } else { + r = regr + 0x10; + } + + w2(0xc); w0(r); w2(4); w2(5); + w0(0); a = r1(); + w0(1); b = r1(); + w2(4); + + return j44(a, b); +} + +static void fit2_read_block(struct pi_adapter *pi, char *buf, int count) +{ + int k, a, b, c, d; + + w2(0xc); w0(0x10); + + for (k = 0; k < count / 4; k++) { + w2(4); w2(5); + w0(0); a = r1(); w0(1); b = r1(); + w0(3); c = r1(); w0(2); d = r1(); + buf[4 * k + 0] = j44(a, b); + buf[4 * k + 1] = j44(d, c); + + w2(4); w2(5); + a = r1(); w0(3); b = r1(); + w0(1); c = r1(); w0(0); d = r1(); + buf[4 * k + 2] = j44(d, c); + buf[4 * k + 3] = j44(a, b); + } + + w2(4); +} + +static void fit2_write_block(struct pi_adapter *pi, char *buf, int count) +{ + int k; + + w2(0xc); w0(0); + for (k = 0; k < count / 2; k++) { + w2(4); w0(buf[2 * k]); + w2(5); w0(buf[2 * k + 1]); + } + w2(4); +} + +static void fit2_connect(struct pi_adapter *pi) +{ + pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + w2(0xcc); +} + +static void fit2_disconnect(struct pi_adapter *pi) +{ + w0(pi->saved_r0); + w2(pi->saved_r2); +} + +static void fit2_log_adapter(struct pi_adapter *pi) +{ + dev_info(&pi->dev, "FIT 2000 adapter at 0x%x, delay %d\n", + pi->port, pi->delay); + +} + +static struct pi_protocol fit2 = { + .owner = THIS_MODULE, + .name = "fit2", + .max_mode = 1, + .epp_first = 2, + .default_delay = 1, + .max_units = 1, + .write_regr = fit2_write_regr, + .read_regr = fit2_read_regr, + .write_block = fit2_write_block, + .read_block = fit2_read_block, + .connect = fit2_connect, + .disconnect = fit2_disconnect, + .log_adapter = fit2_log_adapter, +}; + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>"); +MODULE_DESCRIPTION("Fidelity International Technology parallel port IDE adapter" + "(older models) protocol driver"); +module_pata_parport_driver(fit2); |