Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/ide.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) static const char *udma_str[] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 	 { "UDMA/16", "UDMA/25",  "UDMA/33",  "UDMA/44",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 	   "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) static const char *mwdma_str[] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 	{ "MWDMA0", "MWDMA1", "MWDMA2", "MWDMA3", "MWDMA4" };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) static const char *swdma_str[] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	{ "SWDMA0", "SWDMA1", "SWDMA2" };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) static const char *pio_str[] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	{ "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5", "PIO6" };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *	ide_xfer_verbose	-	return IDE mode names
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *	@mode: transfer mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  *	Returns a constant string giving the name of the mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *	requested.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) const char *ide_xfer_verbose(u8 mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	const char *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	u8 i = mode & 0xf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		s = udma_str[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		s = mwdma_str[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		s = swdma_str[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		s = pio_str[i & 0x7];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	else if (mode == XFER_PIO_SLOW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		s = "PIO SLOW";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		s = "XFER ERROR";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	return s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) EXPORT_SYMBOL(ide_xfer_verbose);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  *	ide_get_best_pio_mode	-	get PIO mode from drive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  *	@drive: drive to consider
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  *	@mode_wanted: preferred mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  *	@max_mode: highest allowed mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  *	This routine returns the recommended PIO settings for a given drive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  *	based on the drive->id information and the ide_pio_blacklist[].
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  *	Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  *	This is used by most chipset support modules when "auto-tuning".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static u8 ide_get_best_pio_mode(ide_drive_t *drive, u8 mode_wanted, u8 max_mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	u16 *id = drive->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	int pio_mode = -1, overridden = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if (mode_wanted != 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		return min_t(u8, mode_wanted, max_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		pio_mode = ide_scan_pio_blacklist((char *)&id[ATA_ID_PROD]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	if (pio_mode != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		pio_mode = id[ATA_ID_OLD_PIO_MODES] >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		if (pio_mode > 2) {	/* 2 is maximum allowed tPIO value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 			pio_mode = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			overridden = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		if (id[ATA_ID_FIELD_VALID] & 2) {	      /* ATA2? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			if (ata_id_is_cfa(id) && (id[ATA_ID_CFA_MODES] & 7))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 				pio_mode = 4 + min_t(int, 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 						     id[ATA_ID_CFA_MODES] & 7);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 			else if (ata_id_has_iordy(id)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 				if (id[ATA_ID_PIO_MODES] & 7) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 					overridden = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 					if (id[ATA_ID_PIO_MODES] & 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 						pio_mode = 5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 					else if (id[ATA_ID_PIO_MODES] & 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 						pio_mode = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 					else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 						pio_mode = 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		if (overridden)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 					 drive->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (pio_mode > max_mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		pio_mode = max_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	return pio_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int ide_pio_need_iordy(ide_drive_t *drive, const u8 pio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	 * IORDY may lead to controller lock up on certain controllers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	 * if the port is not occupied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (pio == 0 && (drive->hwif->port_flags & IDE_PFLAG_PROBING))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	return ata_id_pio_need_iordy(drive->id, pio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) EXPORT_SYMBOL_GPL(ide_pio_need_iordy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	ide_hwif_t *hwif = drive->hwif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	const struct ide_port_ops *port_ops = hwif->port_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (port_ops == NULL || port_ops->set_pio_mode == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	 * TODO: temporary hack for some legacy host drivers that didn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	 * set transfer mode on the device in ->set_pio_mode method...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (port_ops->set_dma_mode == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		drive->pio_mode = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		port_ops->set_pio_mode(hwif, drive);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		if (ide_config_drive_speed(drive, mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		drive->pio_mode = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		port_ops->set_pio_mode(hwif, drive);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		drive->pio_mode = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		port_ops->set_pio_mode(hwif, drive);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		return ide_config_drive_speed(drive, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	ide_hwif_t *hwif = drive->hwif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	const struct ide_port_ops *port_ops = hwif->port_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	if (port_ops == NULL || port_ops->set_dma_mode == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		if (ide_config_drive_speed(drive, mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		drive->dma_mode = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		port_ops->set_dma_mode(hwif, drive);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		drive->dma_mode = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		port_ops->set_dma_mode(hwif, drive);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		return ide_config_drive_speed(drive, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) EXPORT_SYMBOL_GPL(ide_set_dma_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /* req_pio == "255" for auto-tune */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) void ide_set_pio(ide_drive_t *drive, u8 req_pio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	ide_hwif_t *hwif = drive->hwif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	const struct ide_port_ops *port_ops = hwif->port_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	u8 host_pio, pio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	    (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	BUG_ON(hwif->pio_mask == 0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	host_pio = fls(hwif->pio_mask) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	 * TODO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	 * - report device max PIO mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	 * - check req_pio != 255 against device max PIO mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			  drive->name, host_pio, req_pio,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			  req_pio == 255 ? "(auto-tune)" : "", pio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	(void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) EXPORT_SYMBOL_GPL(ide_set_pio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)  *	ide_rate_filter		-	filter transfer mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)  *	@drive: IDE device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)  *	@speed: desired speed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)  *	Given the available transfer modes this function returns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  *	the best available speed at or below the speed requested.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  *	TODO: check device PIO capabilities
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	ide_hwif_t *hwif = drive->hwif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	u8 mode = ide_find_dma_mode(drive, speed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (mode == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		if (hwif->pio_mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 			mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			mode = XFER_PIO_4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) /*	printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	return min(speed, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  *	ide_set_xfer_rate	-	set transfer rate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)  *	@drive: drive to set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)  *	@rate: speed to attempt to set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)  *	General helper for setting the speed of an IDE device. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)  *	function knows about user enforced limits from the configuration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)  *	which ->set_pio_mode/->set_dma_mode does not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	ide_hwif_t *hwif = drive->hwif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	const struct ide_port_ops *port_ops = hwif->port_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	if (port_ops == NULL || port_ops->set_dma_mode == NULL ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	    (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	rate = ide_rate_filter(drive, rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	BUG_ON(rate < XFER_PIO_0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	if (rate >= XFER_PIO_0 && rate <= XFER_PIO_6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		return ide_set_pio_mode(drive, rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	return ide_set_dma_mode(drive, rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }