/* * Freescale iMX51 ATA driver * * Copyright (C) 2010 Marek Vasut * * Based on code by: * Mahesh Mahadevan * * 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. * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include #include #include #include #include /* 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_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_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 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 */ writeb(3, &ata_regs->time_off); writeb(3, &ata_regs->time_on); writeb((pio_t1[mode] + T) / T, &ata_regs->time_1); writeb((pio_t2_8[mode] + T) / T, &ata_regs->time_2w); /* Write TIME_2R/AX/RDX/4 */ writeb((pio_t2_8[mode] + T) / T, &ata_regs->time_2r); writeb((pio_tA[mode] + T) / T + 2, &ata_regs->time_ax); writeb(1, &ata_regs->time_pio_rdx); writeb((pio_t4[mode] + T) / T, &ata_regs->time_4); /* Write TIME_9 ; the rest of timing registers is irrelevant for PIO */ writeb((pio_t9[mode] + T) / T, &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; }