| /* |
| epia.c (c) 1997-8 Grant R. Guenther <grant@torque.net> |
| Under the terms of the GNU General Public License. |
| |
| epia.c is a low-level protocol driver for Shuttle Technologies |
| EPIA parallel to IDE adapter chip. This device is now obsolete |
| and has been replaced with the EPAT chip, which is supported |
| by epat.c, however, some devices based on EPIA are still |
| available. |
| |
| */ |
| |
| #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 on port 1, 8-bit writes |
| 1 5/3 reads on ports 1 & 2, 8-bit writes |
| 2 8-bit reads and writes |
| 3 8-bit EPP mode |
| 4 16-bit EPP |
| 5 32-bit EPP |
| */ |
| |
| #define j44(a,b) (((a>>4)&0x0f)+(b&0xf0)) |
| #define j53(a,b) (((a>>3)&0x1f)+((b<<4)&0xe0)) |
| |
| /* cont = 0 IDE register file |
| cont = 1 IDE control registers |
| */ |
| |
| static int cont_map[2] = { 0, 0x80 }; |
| |
| static int epia_read_regr(struct pi_adapter *pi, int cont, int regr) |
| |
| { int a, b, r; |
| |
| regr += cont_map[cont]; |
| |
| switch (pi->mode) { |
| |
| case 0: r = regr^0x39; |
| w0(r); w2(1); w2(3); w0(r); |
| a = r1(); w2(1); b = r1(); w2(4); |
| return j44(a,b); |
| |
| case 1: r = regr^0x31; |
| w0(r); w2(1); w0(r&0x37); |
| w2(3); w2(5); w0(r|0xf0); |
| a = r1(); b = r2(); w2(4); |
| return j53(a,b); |
| |
| case 2: r = regr^0x29; |
| w0(r); w2(1); w2(0X21); w2(0x23); |
| a = r0(); w2(4); |
| return a; |
| |
| case 3: |
| case 4: |
| case 5: w3(regr); w2(0x24); a = r4(); w2(4); |
| return a; |
| |
| } |
| return -1; |
| } |
| |
| static void epia_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: |
| case 2: r = regr^0x19; |
| w0(r); w2(1); w0(val); w2(3); w2(4); |
| break; |
| |
| case 3: |
| case 4: |
| case 5: r = regr^0x40; |
| w3(r); w4(val); w2(4); |
| break; |
| } |
| } |
| |
| #define WR(r,v) epia_write_regr(pi,0,r,v) |
| #define RR(r) (epia_read_regr(pi,0,r)) |
| |
| /* The use of register 0x84 is entirely unclear - it seems to control |
| some EPP counters ... currently we know about 3 different block |
| sizes: the standard 512 byte reads and writes, 12 byte writes and |
| 2048 byte reads (the last two being used in the CDrom drivers. |
| */ |
| |
| static void epia_connect(struct pi_adapter *pi) |
| |
| { pi->saved_r0 = r0(); |
| pi->saved_r2 = r2(); |
| |
| w2(4); w0(0xa0); w0(0x50); w0(0xc0); w0(0x30); w0(0xa0); w0(0); |
| w2(1); w2(4); |
| if (pi->mode >= 3) { |
| w0(0xa); w2(1); w2(4); w0(0x82); w2(4); w2(0xc); w2(4); |
| w2(0x24); w2(0x26); w2(4); |
| } |
| WR(0x86,8); |
| } |
| |
| static void epia_disconnect(struct pi_adapter *pi) |
| |
| { /* WR(0x84,0x10); */ |
| w0(pi->saved_r0); |
| w2(1); w2(4); |
| w0(pi->saved_r0); |
| w2(pi->saved_r2); |
| } |
| |
| static void epia_read_block(struct pi_adapter *pi, char *buf, int count) |
| |
| { int k, ph, a, b; |
| |
| switch (pi->mode) { |
| |
| case 0: w0(0x81); w2(1); w2(3); w0(0xc1); |
| ph = 1; |
| for (k=0;k<count;k++) { |
| w2(2+ph); a = r1(); |
| w2(4+ph); b = r1(); |
| buf[k] = j44(a,b); |
| ph = 1 - ph; |
| } |
| w0(0); w2(4); |
| break; |
| |
| case 1: w0(0x91); w2(1); w0(0x10); w2(3); |
| w0(0x51); w2(5); w0(0xd1); |
| ph = 1; |
| for (k=0;k<count;k++) { |
| w2(4+ph); |
| a = r1(); b = r2(); |
| buf[k] = j53(a,b); |
| ph = 1 - ph; |
| } |
| w0(0); w2(4); |
| break; |
| |
| case 2: w0(0x89); w2(1); w2(0x23); w2(0x21); |
| ph = 1; |
| for (k=0;k<count;k++) { |
| w2(0x24+ph); |
| buf[k] = r0(); |
| ph = 1 - ph; |
| } |
| w2(6); w2(4); |
| break; |
| |
| case 3: if (count > 512) WR(0x84,3); |
| w3(0); w2(0x24); |
| for (k=0;k<count;k++) buf[k] = r4(); |
| w2(4); WR(0x84,0); |
| break; |
| |
| case 4: if (count > 512) WR(0x84,3); |
| w3(0); w2(0x24); |
| for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w(); |
| w2(4); WR(0x84,0); |
| break; |
| |
| case 5: if (count > 512) WR(0x84,3); |
| w3(0); w2(0x24); |
| for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l(); |
| w2(4); WR(0x84,0); |
| break; |
| |
| } |
| } |
| |
| static void epia_write_block(struct pi_adapter *pi, char *buf, int count) |
| |
| { int ph, k, last, d; |
| |
| switch (pi->mode) { |
| |
| case 0: |
| case 1: |
| case 2: w0(0xa1); w2(1); w2(3); w2(1); w2(5); |
| ph = 0; last = 0x8000; |
| for (k=0;k<count;k++) { |
| d = buf[k]; |
| if (d != last) { last = d; w0(d); } |
| w2(4+ph); |
| ph = 1 - ph; |
| } |
| w2(7); w2(4); |
| break; |
| |
| case 3: if (count < 512) WR(0x84,1); |
| w3(0x40); |
| for (k=0;k<count;k++) w4(buf[k]); |
| if (count < 512) WR(0x84,0); |
| break; |
| |
| case 4: if (count < 512) WR(0x84,1); |
| w3(0x40); |
| for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]); |
| if (count < 512) WR(0x84,0); |
| break; |
| |
| case 5: if (count < 512) WR(0x84,1); |
| w3(0x40); |
| for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]); |
| if (count < 512) WR(0x84,0); |
| break; |
| |
| } |
| |
| } |
| |
| static int epia_test_proto(struct pi_adapter *pi) |
| |
| { int j, k, f; |
| int e[2] = {0,0}; |
| char scratch[512]; |
| |
| epia_connect(pi); |
| for (j=0;j<2;j++) { |
| WR(6,0xa0+j*0x10); |
| for (k=0;k<256;k++) { |
| WR(2,k^0xaa); |
| WR(3,k^0x55); |
| if (RR(2) != (k^0xaa)) e[j]++; |
| } |
| WR(2,1); WR(3,1); |
| } |
| epia_disconnect(pi); |
| |
| f = 0; |
| epia_connect(pi); |
| WR(0x84,8); |
| epia_read_block(pi,scratch,512); |
| for (k=0;k<256;k++) { |
| if ((scratch[2*k] & 0xff) != ((k+1) & 0xff)) f++; |
| if ((scratch[2*k+1] & 0xff) != ((-2-k) & 0xff)) f++; |
| } |
| WR(0x84,0); |
| epia_disconnect(pi); |
| |
| dev_dbg(&pi->dev, "epia: port 0x%x, mode %d, test=(%d,%d,%d)\n", |
| pi->port, pi->mode, e[0], e[1], f); |
| |
| return (e[0] && e[1]) || f; |
| |
| } |
| |
| |
| static void epia_log_adapter(struct pi_adapter *pi) |
| |
| { char *mode_string[6] = {"4-bit","5/3","8-bit", |
| "EPP-8","EPP-16","EPP-32"}; |
| |
| dev_info(&pi->dev, "Shuttle EPIA at 0x%x, mode %d (%s), delay %d\n", |
| pi->port, pi->mode, mode_string[pi->mode], pi->delay); |
| } |
| |
| static struct pi_protocol epia = { |
| .owner = THIS_MODULE, |
| .name = "epia", |
| .max_mode = 6, |
| .epp_first = 3, |
| .default_delay = 1, |
| .max_units = 1, |
| .write_regr = epia_write_regr, |
| .read_regr = epia_read_regr, |
| .write_block = epia_write_block, |
| .read_block = epia_read_block, |
| .connect = epia_connect, |
| .disconnect = epia_disconnect, |
| .test_proto = epia_test_proto, |
| .log_adapter = epia_log_adapter, |
| }; |
| |
| MODULE_LICENSE("GPL"); |
| module_pata_parport_driver(epia); |
