diff options
Diffstat (limited to 'drivers/ata/pata_parport/friq.c')
| -rw-r--r-- | drivers/ata/pata_parport/friq.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/ata/pata_parport/friq.c b/drivers/ata/pata_parport/friq.c new file mode 100644 index 0000000000..7abe2ff406 --- /dev/null +++ b/drivers/ata/pata_parport/friq.c @@ -0,0 +1,264 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * (c) 1998 Grant R. Guenther <grant@torque.net> + * + * friq.c is a low-level protocol driver for the Freecom "IQ" + * parallel port IDE adapter. Early versions of this adapter + * use the 'frpw' protocol. + * + * Freecom uses this adapter in a battery powered external + * CD-ROM drive. It is also used in LS-120 drives by + * Maxell and Panasonic, and other devices. + * + * The battery powered drive requires software support to + * control the power to the drive. This module enables the + * drive power when the high level driver (pcd) is loaded + * and disables it when the module is unloaded. Note, if + * the friq module is built in to the kernel, the power + * will never be switched off, so other means should be + * used to conserve battery power. + */ + +#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 CMD(x) \ + do { \ + w2(4); w0(0xff); w0(0xff); w0(0x73); w0(0x73); \ + w0(0xc9); w0(0xc9); w0(0x26); \ + w0(0x26); w0(x); w0(x); \ + } while (0) + +#define j44(l, h) (((l >> 4) & 0x0f) | (h & 0xf0)) + +/* + * cont = 0 - access the IDE register file + * cont = 1 - access the IDE command set + */ +static int cont_map[2] = { 0x08, 0x10 }; + +static int friq_read_regr(struct pi_adapter *pi, int cont, int regr) +{ + int h, l, r; + + r = regr + cont_map[cont]; + + CMD(r); + w2(6); l = r1(); + w2(4); h = r1(); + w2(4); + + return j44(l, h); +} + +static void friq_write_regr(struct pi_adapter *pi, int cont, int regr, int val) +{ + int r = regr + cont_map[cont]; + + CMD(r); + w0(val); + w2(5); w2(7); w2(5); w2(4); +} + +static void friq_read_block_int(struct pi_adapter *pi, char *buf, int count, int regr) +{ + int h, l, k, ph; + + switch (pi->mode) { + case 0: + CMD(regr); + for (k = 0; k < count; k++) { + w2(6); l = r1(); + w2(4); h = r1(); + buf[k] = j44(l, h); + } + w2(4); + break; + case 1: + ph = 2; + CMD(regr + 0xc0); + w0(0xff); + for (k = 0; k < count; k++) { + w2(0xa4 + ph); + buf[k] = r0(); + ph = 2 - ph; + } + w2(0xac); w2(0xa4); w2(4); + break; + case 2: + CMD(regr + 0x80); + for (k = 0; k < count - 2; k++) + buf[k] = r4(); + w2(0xac); w2(0xa4); + buf[count - 2] = r4(); + buf[count - 1] = r4(); + w2(4); + break; + case 3: + CMD(regr + 0x80); + for (k = 0; k < count / 2 - 1; k++) + ((u16 *)buf)[k] = r4w(); + w2(0xac); w2(0xa4); + buf[count - 2] = r4(); + buf[count - 1] = r4(); + w2(4); + break; + case 4: + CMD(regr + 0x80); + for (k = 0; k < count / 4 - 1; k++) + ((u32 *)buf)[k] = r4l(); + buf[count - 4] = r4(); + buf[count - 3] = r4(); + w2(0xac); w2(0xa4); + buf[count - 2] = r4(); + buf[count - 1] = r4(); + w2(4); + break; + } +} + +static void friq_read_block(struct pi_adapter *pi, char *buf, int count) +{ + friq_read_block_int(pi, buf, count, 0x08); +} + +static void friq_write_block(struct pi_adapter *pi, char *buf, int count) +{ + int k; + + switch (pi->mode) { + case 0: + case 1: + CMD(8); w2(5); + for (k = 0; k < count; k++) { + w0(buf[k]); + w2(7); w2(5); + } + w2(4); + break; + case 2: + CMD(0xc8); w2(5); + for (k = 0; k < count; k++) + w4(buf[k]); + w2(4); + break; + case 3: + CMD(0xc8); w2(5); + for (k = 0; k < count / 2; k++) + w4w(((u16 *)buf)[k]); + w2(4); + break; + case 4: + CMD(0xc8); w2(5); + for (k = 0; k < count / 4; k++) + w4l(((u32 *)buf)[k]); + w2(4); + break; +} +} + +static void friq_connect(struct pi_adapter *pi) +{ + pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + w2(4); +} + +static void friq_disconnect(struct pi_adapter *pi) +{ + CMD(0x20); + w0(pi->saved_r0); + w2(pi->saved_r2); +} + +static int friq_test_proto(struct pi_adapter *pi) +{ + int j, k, r; + int e[2] = { 0, 0 }; + char scratch[512]; + + pi->saved_r0 = r0(); + w0(0xff); udelay(20); CMD(0x3d); /* turn the power on */ + udelay(500); + w0(pi->saved_r0); + + friq_connect(pi); + for (j = 0; j < 2; j++) { + friq_write_regr(pi, 0, 6, 0xa0 + j * 0x10); + for (k = 0; k < 256; k++) { + friq_write_regr(pi, 0, 2, k ^ 0xaa); + friq_write_regr(pi, 0, 3, k ^ 0x55); + if (friq_read_regr(pi, 0, 2) != (k ^ 0xaa)) + e[j]++; + } + } + friq_disconnect(pi); + + friq_connect(pi); + friq_read_block_int(pi, scratch, 512, 0x10); + r = 0; + for (k = 0; k < 128; k++) { + if (scratch[k] != k) + r++; + } + friq_disconnect(pi); + + dev_dbg(&pi->dev, + "friq: port 0x%x, mode %d, test=(%d,%d,%d)\n", + pi->port, pi->mode, e[0], e[1], r); + + return r || (e[0] && e[1]); +} + +static void friq_log_adapter(struct pi_adapter *pi) +{ + char *mode_string[6] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32"}; + + dev_info(&pi->dev, + "Freecom IQ ASIC-2 adapter at 0x%x, mode %d (%s), delay %d\n", + pi->port, pi->mode, mode_string[pi->mode], pi->delay); + + pi->private = 1; + friq_connect(pi); + CMD(0x9e); /* disable sleep timer */ + friq_disconnect(pi); +} + +static void friq_release_proto(struct pi_adapter *pi) +{ + if (pi->private) { /* turn off the power */ + friq_connect(pi); + CMD(0x1d); CMD(0x1e); + friq_disconnect(pi); + pi->private = 0; + } +} + +static struct pi_protocol friq = { + .owner = THIS_MODULE, + .name = "friq", + .max_mode = 5, + .epp_first = 2, + .default_delay = 1, + .max_units = 1, + .write_regr = friq_write_regr, + .read_regr = friq_read_regr, + .write_block = friq_write_block, + .read_block = friq_read_block, + .connect = friq_connect, + .disconnect = friq_disconnect, + .test_proto = friq_test_proto, + .log_adapter = friq_log_adapter, + .release_proto = friq_release_proto, +}; + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>"); +MODULE_DESCRIPTION("Freecom IQ parallel port IDE adapter protocol driver"); +module_pata_parport_driver(friq); |