diff options
Diffstat (limited to 'u-boot/arch/powerpc/cpu/mpc512x/ide.c')
| -rw-r--r-- | u-boot/arch/powerpc/cpu/mpc512x/ide.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/u-boot/arch/powerpc/cpu/mpc512x/ide.c b/u-boot/arch/powerpc/cpu/mpc512x/ide.c new file mode 100644 index 0000000..dd6b2f4 --- /dev/null +++ b/u-boot/arch/powerpc/cpu/mpc512x/ide.c @@ -0,0 +1,128 @@ +/* + * (C) Copyright 2007-2009 DENX Software Engineering + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + */ + +#include <common.h> +#include <command.h> +#include <asm/io.h> +#include <asm/processor.h> + +DECLARE_GLOBAL_DATA_PTR; + +#if defined(CONFIG_IDE_RESET) + +void ide_set_reset (int idereset) +{ + volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; + debug ("ide_set_reset(%d)\n", idereset); + + if (idereset) { + out_be32(&im->pata.pata_ata_control, 0); + } else { + out_be32(&im->pata.pata_ata_control, FSL_ATA_CTRL_ATA_RST_B); + } + udelay(100); +} + +void init_ide_reset (void) +{ + debug ("init_ide_reset\n"); + + /* + * Clear the reset bit to reset the interface + * cf. RefMan MPC5121EE: 28.4.1 Resetting the ATA Bus + */ + ide_set_reset(1); + + /* Assert the reset bit to enable the interface */ + ide_set_reset(0); + +} + +#define CALC_TIMING(t) (t + period - 1) / period + +int ide_preinit (void) +{ + volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; + long t; + const struct { + short t0; + short t1; + short t2_8; + short t2_16; + short t2i; + short t4; + short t9; + short tA; + } pio_specs = { + .t0 = 600, + .t1 = 70, + .t2_8 = 290, + .t2_16 = 165, + .t2i = 0, + .t4 = 30, + .t9 = 20, + .tA = 50, + }; + union { + u32 config; + struct { + u8 field1; + u8 field2; + u8 field3; + u8 field4; + }bytes; + } cfg; + + debug ("IDE preinit using PATA peripheral at IMMR-ADDR %08x\n", + (u32)&im->pata); + + /* Set the reset bit to 1 to enable the interface */ + ide_set_reset(0); + + /* Init timings : we use PIO mode 0 timings */ + t = 1000000000 / gd->ips_clk; /* period in ns */ + cfg.bytes.field1 = 3; + cfg.bytes.field2 = 3; + cfg.bytes.field3 = (pio_specs.t1 + t) / t; + cfg.bytes.field4 = (pio_specs.t2_8 + t) / t; + + out_be32(&im->pata.pata_time1, cfg.config); + + cfg.bytes.field1 = (pio_specs.t2_8 + t) / t; + cfg.bytes.field2 = (pio_specs.tA + t) / t + 2; + cfg.bytes.field3 = 1; + cfg.bytes.field4 = (pio_specs.t4 + t) / t; + + out_be32(&im->pata.pata_time2, cfg.config); + + cfg.config = in_be32(&im->pata.pata_time3); + cfg.bytes.field1 = (pio_specs.t9 + t) / t; + + out_be32(&im->pata.pata_time3, cfg.config); + + debug ("PATA preinit complete.\n"); + + return 0; +} + +#endif /* defined(CONFIG_IDE_RESET) */ |