diff options
Diffstat (limited to 'drivers/ata/pata_parport/comm.c')
| -rw-r--r-- | drivers/ata/pata_parport/comm.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/ata/pata_parport/comm.c b/drivers/ata/pata_parport/comm.c new file mode 100644 index 0000000000..94b8d35210 --- /dev/null +++ b/drivers/ata/pata_parport/comm.c @@ -0,0 +1,205 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * (c) 1997-1998 Grant R. Guenther <grant@torque.net> + * + * comm.c is a low-level protocol driver for some older models of the DataStor + * "Commuter" parallel to IDE adapter. Some of the parallel port devices + * marketed by Arista currently use this adapter. + */ + +#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" + +/* + * mode codes: 0 nybble reads, 8-bit writes + * 1 8-bit reads and writes + * 2 8-bit EPP mode + */ + +#define j44(a, b) (((a >> 3) & 0x0f) | ((b << 1) & 0xf0)) + +#define P1 w2(5);w2(0xd);w2(0xd);w2(5);w2(4); +#define P2 w2(5);w2(7);w2(7);w2(5);w2(4); + +/* + * cont = 0 - access the IDE register file + * cont = 1 - access the IDE command set + */ +static int cont_map[2] = { 0x08, 0x10 }; + +static int comm_read_regr(struct pi_adapter *pi, int cont, int regr) +{ + int l, h, r; + + r = regr + cont_map[cont]; + + switch (pi->mode) { + case 0: + w0(r); P1; w0(0); + w2(6); l = r1(); w0(0x80); h = r1(); w2(4); + return j44(l, h); + + case 1: + w0(r+0x20); P1; + w0(0); w2(0x26); h = r0(); w2(4); + return h; + + case 2: + case 3: + case 4: + w3(r+0x20); (void)r1(); + w2(0x24); h = r4(); w2(4); + return h; + } + + return -1; +} + +static void comm_write_regr(struct pi_adapter *pi, int cont, int regr, int val) +{ + int r = regr + cont_map[cont]; + + switch (pi->mode) { + case 0: + case 1: + w0(r); P1; w0(val); P2; + break; + case 2: + case 3: + case 4: + w3(r); (void)r1(); w4(val); + break; + } +} + +static void comm_connect(struct pi_adapter *pi) +{ + pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + w2(4); w0(0xff); w2(6); + w2(4); w0(0xaa); w2(6); + w2(4); w0(0x00); w2(6); + w2(4); w0(0x87); w2(6); + w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4); +} + +static void comm_disconnect(struct pi_adapter *pi) +{ + w2(0); w2(0); w2(0); w2(4); + w0(pi->saved_r0); + w2(pi->saved_r2); +} + +static void comm_read_block(struct pi_adapter *pi, char *buf, int count) +{ + int i, l, h; + + switch (pi->mode) { + case 0: + w0(0x48); P1; + for (i = 0; i < count; i++) { + w0(0); w2(6); l = r1(); + w0(0x80); h = r1(); w2(4); + buf[i] = j44(l, h); + } + break; + case 1: + w0(0x68); P1; w0(0); + for (i = 0; i < count; i++) { + w2(0x26); + buf[i] = r0(); + w2(0x24); + } + w2(4); + break; + case 2: + w3(0x68); (void)r1(); w2(0x24); + for (i = 0; i < count; i++) + buf[i] = r4(); + w2(4); + break; + case 3: + w3(0x68); (void)r1(); w2(0x24); + for (i = 0; i < count / 2; i++) + ((u16 *)buf)[i] = r4w(); + w2(4); + break; + case 4: + w3(0x68); (void)r1(); w2(0x24); + for (i = 0; i < count / 4; i++) + ((u32 *)buf)[i] = r4l(); + w2(4); + break; + } +} + +/* NB: Watch out for the byte swapped writes ! */ +static void comm_write_block(struct pi_adapter *pi, char *buf, int count) +{ + int k; + + switch (pi->mode) { + case 0: + case 1: + w0(0x68); P1; + for (k = 0; k < count; k++) { + w2(5); + w0(buf[k ^ 1]); + w2(7); + } + w2(5); w2(4); + break; + case 2: + w3(0x48); (void)r1(); + for (k = 0; k < count; k++) + w4(buf[k ^ 1]); + break; + case 3: + w3(0x48); (void)r1(); + for (k = 0; k < count / 2; k++) + w4w(swab16(((u16 *)buf)[k])); + break; + case 4: + w3(0x48); (void)r1(); + for (k = 0; k < count / 4; k++) + w4l(swab16(((u16 *)buf)[2 * k]) | + swab16(((u16 *)buf)[2 * k + 1]) << 16); + break; + } +} + +static void comm_log_adapter(struct pi_adapter *pi) +{ + char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" }; + + dev_info(&pi->dev, + "DataStor Commuter at 0x%x, mode %d (%s), delay %d\n", + pi->port, pi->mode, mode_string[pi->mode], pi->delay); +} + +static struct pi_protocol comm = { + .owner = THIS_MODULE, + .name = "comm", + .max_mode = 5, + .epp_first = 2, + .default_delay = 1, + .max_units = 1, + .write_regr = comm_write_regr, + .read_regr = comm_read_regr, + .write_block = comm_write_block, + .read_block = comm_read_block, + .connect = comm_connect, + .disconnect = comm_disconnect, + .log_adapter = comm_log_adapter, +}; + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>"); +MODULE_DESCRIPTION("DataStor Commuter parallel port IDE adapter protocol driver"); +module_pata_parport_driver(comm); |