// SPDX-License-Identifier: GPL-2.0-or-later /* * (c) 1997-1998 Grant R. Guenther * * on26.c is a low-level protocol driver for the * OnSpec 90c26 parallel to IDE adapter chip. */ #include #include #include #include #include #include #include #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 "); MODULE_DESCRIPTION("Onspec 90c26 parallel port IDE adapter protocol driver"); module_pata_parport_driver(on26);