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Diffstat (limited to 'arch/powerpc/cpu/mpc512x/ide.c')
-rw-r--r--arch/powerpc/cpu/mpc512x/ide.c128
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diff --git a/arch/powerpc/cpu/mpc512x/ide.c b/arch/powerpc/cpu/mpc512x/ide.c
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+++ b/arch/powerpc/cpu/mpc512x/ide.c
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+/*
+ * (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) */