diff options
Diffstat (limited to 'drivers/ata/pata_parport/dstr.c')
| -rw-r--r-- | drivers/ata/pata_parport/dstr.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/ata/pata_parport/dstr.c b/drivers/ata/pata_parport/dstr.c new file mode 100644 index 0000000000..88930bb1f0 --- /dev/null +++ b/drivers/ata/pata_parport/dstr.c @@ -0,0 +1,235 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * (c) 1997-1998 Grant R. Guenther <grant@torque.net> + * + * dstr.c is a low-level protocol driver for the DataStor EP2000 parallel + * to IDE adapter chip. + */ + +#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 + * 3 EPP-16 + * 4 EPP-32 + */ + +#define j44(a, b) (((a >> 3) & 0x07) | ((~a >> 4) & 0x08) | \ + ((b << 1) & 0x70) | ((~b) & 0x80)) + +#define P1 w2(5);w2(0xd);w2(5);w2(4); +#define P2 w2(5);w2(7);w2(5);w2(4); +#define P3 w2(6);w2(4);w2(6);w2(4); + +/* + * cont = 0 - access the IDE register file + * cont = 1 - access the IDE command set + */ +static int cont_map[2] = { 0x20, 0x40 }; + +static int dstr_read_regr(struct pi_adapter *pi, int cont, int regr) +{ + int a, b, r; + + r = regr + cont_map[cont]; + + w0(0x81); P1; + if (pi->mode) + w0(0x11); + else + w0(1); + P2; w0(r); P1; + + switch (pi->mode) { + case 0: + w2(6); a = r1(); w2(4); w2(6); b = r1(); w2(4); + return j44(a, b); + case 1: + w0(0); w2(0x26); a = r0(); w2(4); + return a; + case 2: + case 3: + case 4: + w2(0x24); a = r4(); w2(4); + return a; + } + + return -1; +} + +static void dstr_write_regr(struct pi_adapter *pi, int cont, int regr, int val) +{ + int r = regr + cont_map[cont]; + + w0(0x81); P1; + if (pi->mode >= 2) + w0(0x11); + else + w0(1); + P2; w0(r); P1; + + switch (pi->mode) { + case 0: + case 1: + w0(val); w2(5); w2(7); w2(5); w2(4); + break; + case 2: + case 3: + case 4: + w4(val); + break; + } +} + +#define CCP(x) \ + do { \ + w0(0xff); w2(0xc); w2(4); \ + w0(0xaa); w0(0x55); w0(0); w0(0xff); \ + w0(0x87); w0(0x78); \ + w0(x); w2(5); w2(4); \ + } while (0) + +static void dstr_connect(struct pi_adapter *pi) +{ + pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + w2(4); CCP(0xe0); w0(0xff); +} + +static void dstr_disconnect(struct pi_adapter *pi) +{ + CCP(0x30); + w0(pi->saved_r0); + w2(pi->saved_r2); +} + +static void dstr_read_block(struct pi_adapter *pi, char *buf, int count) +{ + int k, a, b; + + w0(0x81); P1; + if (pi->mode) + w0(0x19); + else + w0(9); + P2; w0(0x82); P1; P3; w0(0x20); P1; + + switch (pi->mode) { + case 0: + for (k = 0; k < count; k++) { + w2(6); a = r1(); w2(4); + w2(6); b = r1(); w2(4); + buf[k] = j44(a, b); + } + break; + case 1: + w0(0); + for (k = 0; k < count; k++) { + w2(0x26); + buf[k] = r0(); + w2(0x24); + } + w2(4); + break; + case 2: + w2(0x24); + for (k = 0; k < count; k++) + buf[k] = r4(); + w2(4); + break; + case 3: + w2(0x24); + for (k = 0; k < count / 2; k++) + ((u16 *)buf)[k] = r4w(); + w2(4); + break; + case 4: + w2(0x24); + for (k = 0; k < count / 4; k++) + ((u32 *)buf)[k] = r4l(); + w2(4); + break; + } +} + +static void dstr_write_block(struct pi_adapter *pi, char *buf, int count) +{ + int k; + + w0(0x81); P1; + if (pi->mode) + w0(0x19); + else + w0(9); + P2; w0(0x82); P1; P3; w0(0x20); P1; + + switch (pi->mode) { + case 0: + case 1: + for (k = 0; k < count; k++) { + w2(5); + w0(buf[k]); + w2(7); + } + w2(5); w2(4); + break; + case 2: + w2(0xc5); + for (k = 0; k < count; k++) + w4(buf[k]); + w2(0xc4); + break; + case 3: + w2(0xc5); + for (k = 0; k < count / 2; k++) + w4w(((u16 *)buf)[k]); + w2(0xc4); + break; + case 4: + w2(0xc5); + for (k = 0; k < count / 4; k++) + w4l(((u32 *)buf)[k]); + w2(0xc4); + break; + } +} + +static void dstr_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 EP2000 at 0x%x, mode %d (%s), delay %d\n", + pi->port, pi->mode, mode_string[pi->mode], pi->delay); +} + +static struct pi_protocol dstr = { + .owner = THIS_MODULE, + .name = "dstr", + .max_mode = 5, + .epp_first = 2, + .default_delay = 1, + .max_units = 1, + .write_regr = dstr_write_regr, + .read_regr = dstr_read_regr, + .write_block = dstr_write_block, + .read_block = dstr_read_block, + .connect = dstr_connect, + .disconnect = dstr_disconnect, + .log_adapter = dstr_log_adapter, +}; + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>"); +MODULE_DESCRIPTION("DataStor EP2000 parallel port IDE adapter protocol driver"); +module_pata_parport_driver(dstr); |