diff options
Diffstat (limited to 'drivers/ata/pata_parport/on26.c')
-rw-r--r-- | drivers/ata/pata_parport/on26.c | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/drivers/ata/pata_parport/on26.c b/drivers/ata/pata_parport/on26.c new file mode 100644 index 0000000000..c88e5d6f20 --- /dev/null +++ b/drivers/ata/pata_parport/on26.c @@ -0,0 +1,315 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * (c) 1997-1998 Grant R. Guenther <grant@torque.net> + * + * on26.c is a low-level protocol driver for the + * OnSpec 90c26 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 >> 4) & 0x0f) | (b & 0xf0)) + +#define P1 \ + do { \ + w2(5); w2(0xd); w2(5); w2(0xd); w2(5); w2(4); \ + } while (0) + +#define P2 \ + do { \ + w2(5); w2(7); w2(5); w2(4); \ + } while (0) + +/* + * cont = 0 - access the IDE register file + * cont = 1 - access the IDE command set + */ + +static int on26_read_regr(struct pi_adapter *pi, int cont, int regr) +{ + int a, b, r; + + r = (regr << 2) + 1 + cont; + + switch (pi->mode) { + case 0: + w0(1); P1; w0(r); P2; w0(0); P1; + w2(6); a = r1(); w2(4); + w2(6); b = r1(); w2(4); + w2(6); w2(4); w2(6); w2(4); + return j44(a, b); + case 1: + w0(1); P1; w0(r); P2; w0(0); P1; + w2(0x26); a = r0(); w2(4); w2(0x26); w2(4); + return a; + case 2: + case 3: + case 4: + w3(1); w3(1); w2(5); w4(r); w2(4); + w3(0); w3(0); w2(0x24); a = r4(); w2(4); + w2(0x24); (void)r4(); w2(4); + return a; + } + + return -1; +} + +static void on26_write_regr(struct pi_adapter *pi, int cont, int regr, int val) +{ + int r = (regr << 2) + 1 + cont; + + switch (pi->mode) { + case 0: + case 1: + w0(1); P1; w0(r); P2; w0(0); P1; + w0(val); P2; w0(val); P2; + break; + case 2: + case 3: + case 4: + w3(1); w3(1); w2(5); w4(r); w2(4); + w3(0); w3(0); + w2(5); w4(val); w2(4); + w2(5); w4(val); w2(4); + break; + } +} + +#define CCP(x) \ + do { \ + w0(0xfe); w0(0xaa); w0(0x55); w0(0); \ + w0(0xff); w0(0x87); w0(0x78); w0(x); \ + w2(4); w2(5); w2(4); w0(0xff); \ + } while (0) + +static void on26_connect(struct pi_adapter *pi) +{ + int x; + + pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + + CCP(0x20); + if (pi->mode) + x = 9; + else + x = 8; + + w0(2); P1; w0(8); P2; + w0(2); P1; w0(x); P2; +} + +static void on26_disconnect(struct pi_adapter *pi) +{ + if (pi->mode >= 2) { + w3(4); w3(4); w3(4); w3(4); + } else { + w0(4); P1; w0(4); P1; + } + CCP(0x30); + w0(pi->saved_r0); + w2(pi->saved_r2); +} + +#define RESET_WAIT 200 + +/* hard reset */ +static int on26_test_port(struct pi_adapter *pi) +{ + int i, m, d, x = 0, y = 0; + + pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + + d = pi->delay; + m = pi->mode; + pi->delay = 5; + pi->mode = 0; + + w2(0xc); + + CCP(0x30); CCP(0); + + w0(0xfe); w0(0xaa); w0(0x55); w0(0); w0(0xff); + i = ((r1() & 0xf0) << 4); w0(0x87); + i |= (r1() & 0xf0); w0(0x78); + w0(0x20); w2(4); w2(5); + i |= ((r1() & 0xf0) >> 4); + w2(4); w0(0xff); + + if (i == 0xb5f) { + w0(2); P1; w0(0); P2; + w0(3); P1; w0(0); P2; + w0(2); P1; w0(8); P2; udelay(100); + w0(2); P1; w0(0xa); P2; udelay(100); + w0(2); P1; w0(8); P2; udelay(1000); + + on26_write_regr(pi, 0, 6, 0xa0); + + for (i = 0; i < RESET_WAIT; i++) { + on26_write_regr(pi, 0, 6, 0xa0); + x = on26_read_regr(pi, 0, 7); + on26_write_regr(pi, 0, 6, 0xb0); + y = on26_read_regr(pi, 0, 7); + if (!((x & 0x80) || (y & 0x80))) + break; + mdelay(100); + } + + if (i == RESET_WAIT) + dev_err(&pi->dev, + "on26: Device reset failed (%x,%x)\n", x, y); + + w0(4); P1; w0(4); P1; + } + + CCP(0x30); + + pi->delay = d; + pi->mode = m; + w0(pi->saved_r0); + w2(pi->saved_r2); + + return 5; +} + +static void on26_read_block(struct pi_adapter *pi, char *buf, int count) +{ + int k, a, b; + + switch (pi->mode) { + case 0: + w0(1); P1; w0(1); P2; w0(2); P1; w0(0x18); P2; w0(0); P1; + udelay(10); + for (k = 0; k < count; k++) { + w2(6); a = r1(); + w2(4); b = r1(); + buf[k] = j44(a, b); + } + w0(2); P1; w0(8); P2; + break; + case 1: + w0(1); P1; w0(1); P2; w0(2); P1; w0(0x19); P2; w0(0); P1; + udelay(10); + for (k = 0; k < count / 2; k++) { + w2(0x26); buf[2 * k] = r0(); + w2(0x24); buf[2 * k + 1] = r0(); + } + w0(2); P1; w0(9); P2; + break; + case 2: + w3(1); w3(1); w2(5); w4(1); w2(4); + w3(0); w3(0); w2(0x24); + udelay(10); + for (k = 0; k < count; k++) + buf[k] = r4(); + w2(4); + break; + case 3: + w3(1); w3(1); w2(5); w4(1); w2(4); + w3(0); w3(0); w2(0x24); + udelay(10); + for (k = 0; k < count / 2; k++) + ((u16 *)buf)[k] = r4w(); + w2(4); + break; + case 4: + w3(1); w3(1); w2(5); w4(1); w2(4); + w3(0); w3(0); w2(0x24); + udelay(10); + for (k = 0; k < count / 4; k++) + ((u32 *)buf)[k] = r4l(); + w2(4); + break; + } +} + +static void on26_write_block(struct pi_adapter *pi, char *buf, int count) +{ + int k; + + switch (pi->mode) { + case 0: + case 1: + w0(1); P1; w0(1); P2; + w0(2); P1; w0(0x18 + pi->mode); P2; w0(0); P1; + udelay(10); + for (k = 0; k < count / 2; k++) { + w2(5); w0(buf[2 * k]); + w2(7); w0(buf[2 * k + 1]); + } + w2(5); w2(4); + w0(2); P1; w0(8 + pi->mode); P2; + break; + case 2: + w3(1); w3(1); w2(5); w4(1); w2(4); + w3(0); w3(0); w2(0xc5); + udelay(10); + for (k = 0; k < count; k++) + w4(buf[k]); + w2(0xc4); + break; + case 3: + w3(1); w3(1); w2(5); w4(1); w2(4); + w3(0); w3(0); w2(0xc5); + udelay(10); + for (k = 0; k < count / 2; k++) + w4w(((u16 *)buf)[k]); + w2(0xc4); + break; + case 4: + w3(1); w3(1); w2(5); w4(1); w2(4); + w3(0); w3(0); w2(0xc5); + udelay(10); + for (k = 0; k < count / 4; k++) + w4l(((u32 *)buf)[k]); + w2(0xc4); + break; + } +} + +static void on26_log_adapter(struct pi_adapter *pi) +{ + char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" }; + + dev_info(&pi->dev, + "OnSpec 90c26 at 0x%x, mode %d (%s), delay %d\n", + pi->port, pi->mode, mode_string[pi->mode], pi->delay); +} + +static struct pi_protocol on26 = { + .owner = THIS_MODULE, + .name = "on26", + .max_mode = 5, + .epp_first = 2, + .default_delay = 1, + .max_units = 1, + .write_regr = on26_write_regr, + .read_regr = on26_read_regr, + .write_block = on26_write_block, + .read_block = on26_read_block, + .connect = on26_connect, + .disconnect = on26_disconnect, + .test_port = on26_test_port, + .log_adapter = on26_log_adapter, +}; + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>"); +MODULE_DESCRIPTION("Onspec 90c26 parallel port IDE adapter protocol driver"); +module_pata_parport_driver(on26); |