| /* |
| on26.c (c) 1997-8 Grant R. Guenther <grant@torque.net> |
| Under the terms of the GNU General Public License. |
| |
| 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 w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4); |
| #define P2 w2(5);w2(7);w2(5);w2(4); |
| |
| /* 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; |
| |
| 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) w0(0xfe);w0(0xaa);w0(0x55);w0(0);w0(0xff);\ |
| w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff); |
| |
| static void on26_connect(struct pi_adapter *pi) |
| |
| { int x; |
| |
| pi->saved_r0 = r0(); |
| pi->saved_r2 = r2(); |
| |
| CCP(0x20); |
| x = 8; if (pi->mode) x = 9; |
| |
| 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 |
| |
| static int on26_test_port(struct pi_adapter *pi) /* hard reset */ |
| |
| { 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_pata_parport_driver(on26); |
