diff options
Diffstat (limited to 'drivers/block/paride/friq.c')
| -rw-r--r-- | drivers/block/paride/friq.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/drivers/block/paride/friq.c b/drivers/block/paride/friq.c new file mode 100644 index 000000000000..5ea2904d2815 --- /dev/null +++ b/drivers/block/paride/friq.c @@ -0,0 +1,276 @@ +/* + friq.c (c) 1998 Grant R. Guenther <grant@torque.net> + Under the terms of the GNU General Public License + + friq.c is a low-level protocol driver for the Freecom "IQ" + parallel port IDE adapter. Early versions of this adapter + use the 'frpw' protocol. + + Freecom uses this adapter in a battery powered external + CD-ROM drive. It is also used in LS-120 drives by + Maxell and Panasonic, and other devices. + + The battery powered drive requires software support to + control the power to the drive. This module enables the + drive power when the high level driver (pcd) is loaded + and disables it when the module is unloaded. Note, if + the friq module is built in to the kernel, the power + will never be switched off, so other means should be + used to conserve battery power. + +*/ + +/* Changes: + + 1.01 GRG 1998.12.20 Added support for soft power switch +*/ + +#define FRIQ_VERSION "1.01" + +#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 "paride.h" + +#define CMD(x) w2(4);w0(0xff);w0(0xff);w0(0x73);w0(0x73);\ + w0(0xc9);w0(0xc9);w0(0x26);w0(0x26);w0(x);w0(x); + +#define j44(l,h) (((l>>4)&0x0f)|(h&0xf0)) + +/* cont = 0 - access the IDE register file + cont = 1 - access the IDE command set +*/ + +static int cont_map[2] = { 0x08, 0x10 }; + +static int friq_read_regr( PIA *pi, int cont, int regr ) + +{ int h,l,r; + + r = regr + cont_map[cont]; + + CMD(r); + w2(6); l = r1(); + w2(4); h = r1(); + w2(4); + + return j44(l,h); + +} + +static void friq_write_regr( PIA *pi, int cont, int regr, int val) + +{ int r; + + r = regr + cont_map[cont]; + + CMD(r); + w0(val); + w2(5);w2(7);w2(5);w2(4); +} + +static void friq_read_block_int( PIA *pi, char * buf, int count, int regr ) + +{ int h, l, k, ph; + + switch(pi->mode) { + + case 0: CMD(regr); + for (k=0;k<count;k++) { + w2(6); l = r1(); + w2(4); h = r1(); + buf[k] = j44(l,h); + } + w2(4); + break; + + case 1: ph = 2; + CMD(regr+0xc0); + w0(0xff); + for (k=0;k<count;k++) { + w2(0xa4 + ph); + buf[k] = r0(); + ph = 2 - ph; + } + w2(0xac); w2(0xa4); w2(4); + break; + + case 2: CMD(regr+0x80); + for (k=0;k<count-2;k++) buf[k] = r4(); + w2(0xac); w2(0xa4); + buf[count-2] = r4(); + buf[count-1] = r4(); + w2(4); + break; + + case 3: CMD(regr+0x80); + for (k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w(); + w2(0xac); w2(0xa4); + buf[count-2] = r4(); + buf[count-1] = r4(); + w2(4); + break; + + case 4: CMD(regr+0x80); + for (k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l(); + buf[count-4] = r4(); + buf[count-3] = r4(); + w2(0xac); w2(0xa4); + buf[count-2] = r4(); + buf[count-1] = r4(); + w2(4); + break; + + } +} + +static void friq_read_block( PIA *pi, char * buf, int count) + +{ friq_read_block_int(pi,buf,count,0x08); +} + +static void friq_write_block( PIA *pi, char * buf, int count ) + +{ int k; + + switch(pi->mode) { + + case 0: + case 1: CMD(8); w2(5); + for (k=0;k<count;k++) { + w0(buf[k]); + w2(7);w2(5); + } + w2(4); + break; + + case 2: CMD(0xc8); w2(5); + for (k=0;k<count;k++) w4(buf[k]); + w2(4); + break; + + case 3: CMD(0xc8); w2(5); + for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]); + w2(4); + break; + + case 4: CMD(0xc8); w2(5); + for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]); + w2(4); + break; + } +} + +static void friq_connect ( PIA *pi ) + +{ pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + w2(4); +} + +static void friq_disconnect ( PIA *pi ) + +{ CMD(0x20); + w0(pi->saved_r0); + w2(pi->saved_r2); +} + +static int friq_test_proto( PIA *pi, char * scratch, int verbose ) + +{ int j, k, r; + int e[2] = {0,0}; + + pi->saved_r0 = r0(); + w0(0xff); udelay(20); CMD(0x3d); /* turn the power on */ + udelay(500); + w0(pi->saved_r0); + + friq_connect(pi); + for (j=0;j<2;j++) { + friq_write_regr(pi,0,6,0xa0+j*0x10); + for (k=0;k<256;k++) { + friq_write_regr(pi,0,2,k^0xaa); + friq_write_regr(pi,0,3,k^0x55); + if (friq_read_regr(pi,0,2) != (k^0xaa)) e[j]++; + } + } + friq_disconnect(pi); + + friq_connect(pi); + friq_read_block_int(pi,scratch,512,0x10); + r = 0; + for (k=0;k<128;k++) if (scratch[k] != k) r++; + friq_disconnect(pi); + + if (verbose) { + printk("%s: friq: port 0x%x, mode %d, test=(%d,%d,%d)\n", + pi->device,pi->port,pi->mode,e[0],e[1],r); + } + + return (r || (e[0] && e[1])); +} + + +static void friq_log_adapter( PIA *pi, char * scratch, int verbose ) + +{ char *mode_string[6] = {"4-bit","8-bit", + "EPP-8","EPP-16","EPP-32"}; + + printk("%s: friq %s, Freecom IQ ASIC-2 adapter at 0x%x, ", pi->device, + FRIQ_VERSION,pi->port); + printk("mode %d (%s), delay %d\n",pi->mode, + mode_string[pi->mode],pi->delay); + + pi->private = 1; + friq_connect(pi); + CMD(0x9e); /* disable sleep timer */ + friq_disconnect(pi); + +} + +static void friq_release_proto( PIA *pi) +{ + if (pi->private) { /* turn off the power */ + friq_connect(pi); + CMD(0x1d); CMD(0x1e); + friq_disconnect(pi); + pi->private = 0; + } +} + +static struct pi_protocol friq = { + .owner = THIS_MODULE, + .name = "friq", + .max_mode = 5, + .epp_first = 2, + .default_delay = 1, + .max_units = 1, + .write_regr = friq_write_regr, + .read_regr = friq_read_regr, + .write_block = friq_write_block, + .read_block = friq_read_block, + .connect = friq_connect, + .disconnect = friq_disconnect, + .test_proto = friq_test_proto, + .log_adapter = friq_log_adapter, + .release_proto = friq_release_proto, +}; + +static int __init friq_init(void) +{ + return pi_register(&friq)-1; +} + +static void __exit friq_exit(void) +{ + pi_unregister(&friq); +} + +MODULE_LICENSE("GPL"); +module_init(friq_init) +module_exit(friq_exit) |