BLOCK: Add freescale IMX51 PATA driver

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Stefano Babic <sbabic@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>

drivers/block/Makefile

@@ -31,6 +31,7 @@ COBJS-$(CONFIG_FSL_SATA) += fsl_sata.o
 COBJS-$(CONFIG_LIBATA) += libata.o
 COBJS-$(CONFIG_CMD_MG_DISK) += mg_disk.o
 COBJS-$(CONFIG_MVSATA_IDE) += mvsata_ide.o
+COBJS-$(CONFIG_MX51_PATA) += mxc_ata.o
 COBJS-$(CONFIG_PATA_BFIN) += pata_bfin.o
 COBJS-$(CONFIG_SATA_DWC) += sata_dwc.o
 COBJS-$(CONFIG_SATA_SIL3114) += sata_sil3114.o

drivers/block/mxc_ata.c

@@ -0,0 +1,149 @@
+/*
+ * Freescale iMX51 ATA driver
+ *
+ * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * Based on code by:
+ *	Mahesh Mahadevan <mahesh.mahadevan@freescale.com>
+ *
+ * Based on code from original FSL ATA driver, which is
+ * part of eCos, the Embedded Configurable Operating System.
+ * Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
+ *
+ * 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 <config.h>
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <ide.h>
+
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/clock.h>
+
+/* MXC ATA register offsets */
+struct mxc_ata_config_regs {
+	u8	time_off;	/* 0x00 */
+	u8	time_on;
+	u8	time_1;
+	u8	time_2w;
+	u8	time_2r;
+	u8	time_ax;
+	u8	time_pio_rdx;
+	u8	time_4;
+	u8	time_9;
+	u8	time_m;
+	u8	time_jn;
+	u8	time_d;
+	u8	time_k;
+	u8	time_ack;
+	u8	time_env;
+	u8	time_udma_rdx;
+	u8	time_zah;	/* 0x10 */
+	u8	time_mlix;
+	u8	time_dvh;
+	u8	time_dzfs;
+	u8	time_dvs;
+	u8	time_cvh;
+	u8	time_ss;
+	u8	time_cyc;
+	u32	fifo_data_32;	/* 0x18 */
+	u32	fifo_data_16;
+	u32	fifo_fill;
+	u32	ata_control;
+	u32	interrupt_pending;
+	u32	interrupt_enable;
+	u32	interrupt_clear;
+	u32	fifo_alarm;
+};
+
+struct mxc_data_hdd_regs {
+	u32	drive_data;	/* 0xa0 */
+	u32	drive_features;
+	u32	drive_sector_count;
+	u32	drive_sector_num;
+	u32	drive_cyl_low;
+	u32	drive_cyl_high;
+	u32	drive_dev_head;
+	u32	command;
+	u32	status;
+	u32	alt_status;
+};
+
+/* PIO timing table */
+#define	NR_PIO_SPECS	5
+static uint16_t pio_t0[NR_PIO_SPECS]	= { 600, 383, 240, 180, 120 };
+static uint16_t pio_t1[NR_PIO_SPECS]	= { 70,  50,  30,  30,  25 };
+static uint16_t pio_t2_8[NR_PIO_SPECS]	= { 290, 290, 290, 80,  70 };
+static uint16_t pio_t2_16[NR_PIO_SPECS]	= { 165, 125, 100, 80,  70 };
+static uint16_t pio_t2i[NR_PIO_SPECS]	= { 40,  0,   0,   0,   0 };
+static uint16_t pio_t4[NR_PIO_SPECS]	= { 30,  20,  15,  10,  10 };
+static uint16_t pio_t9[NR_PIO_SPECS]	= { 20,  15,  10,  10,  10 };
+static uint16_t pio_tA[NR_PIO_SPECS]	= { 50,  50,  50,  50,  50 };
+
+#define	REG2OFF(reg)	((((uint32_t)reg) & 0x3) * 8)
+static void set_ata_bus_timing(unsigned char mode)
+{
+	uint32_t val;
+	uint32_t T = 1000000000 / mxc_get_clock(MXC_IPG_CLK);
+
+	struct mxc_ata_config_regs *ata_regs;
+	ata_regs = (struct mxc_ata_config_regs *)CONFIG_SYS_ATA_BASE_ADDR;
+
+	if (mode >= NR_PIO_SPECS)
+		return;
+
+	/* Write TIME_OFF/ON/1/2W */
+	val =	(3 << REG2OFF(&ata_regs->time_off)) |
+		(3 << REG2OFF(&ata_regs->time_on)) |
+		(((pio_t1[mode] + T) / T) << REG2OFF(&ata_regs->time_1)) |
+		(((pio_t2_8[mode] + T) / T) << REG2OFF(&ata_regs->time_2w));
+	writel(val, &ata_regs->time_off);
+
+	/* Write TIME_2R/AX/RDX/4 */
+	val =	(((pio_t2_8[mode] + T) / T) << REG2OFF(&ata_regs->time_2r)) |
+		(((pio_tA[mode] + T) / T + 2) << REG2OFF(&ata_regs->time_ax)) |
+		(1 << REG2OFF(&ata_regs->time_pio_rdx)) |
+		(((pio_t4[mode] + T) / T) << REG2OFF(&ata_regs->time_4));
+	writel(val, &ata_regs->time_2r);
+
+	/* Write TIME_9 ; the rest of timing registers is irrelevant for PIO */
+	val =	(((pio_t9[mode] + T) / T) << REG2OFF(&ata_regs->time_9));
+	writel(val, &ata_regs->time_9);
+}
+
+int ide_preinit(void)
+{
+	struct mxc_ata_config_regs *ata_regs;
+	ata_regs = (struct mxc_ata_config_regs *)CONFIG_SYS_ATA_BASE_ADDR;
+
+	/* 46.3.3.4 @ FSL iMX51 manual */
+	/* FIFO normal op., drive reset */
+	writel(0x80, &ata_regs->ata_control);
+	/* FIFO normal op., drive not reset */
+	writel(0xc0, &ata_regs->ata_control);
+
+	/* Configure the PIO timing */
+	set_ata_bus_timing(CONFIG_MXC_ATA_PIO_MODE);
+
+	/* 46.3.3.4 @ FSL iMX51 manual */
+	/* Drive not reset, IORDY handshake */
+	writel(0x41, &ata_regs->ata_control);
+
+	return 0;
+}