1 /*
2 * Freescale iMX51 ATA driver
3 *
4 * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
5 *
6 * Based on code by:
7 * Mahesh Mahadevan <mahesh.mahadevan@freescale.com>
8 *
9 * Based on code from original FSL ATA driver, which is
10 * part of eCos, the Embedded Configurable Operating System.
11 * Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
12 *
13 * SPDX-License-Identifier: GPL-2.0+
14 */
15
16 #include <common.h>
17 #include <command.h>
18 #include <config.h>
19 #include <asm/byteorder.h>
20 #include <asm/io.h>
21 #include <ide.h>
22
23 #include <asm/arch/imx-regs.h>
24 #include <asm/arch/clock.h>
25
26 /* MXC ATA register offsets */
27 struct mxc_ata_config_regs {
28 u8 time_off; /* 0x00 */
29 u8 time_on;
30 u8 time_1;
31 u8 time_2w;
32 u8 time_2r;
33 u8 time_ax;
34 u8 time_pio_rdx;
35 u8 time_4;
36 u8 time_9;
37 u8 time_m;
38 u8 time_jn;
39 u8 time_d;
40 u8 time_k;
41 u8 time_ack;
42 u8 time_env;
43 u8 time_udma_rdx;
44 u8 time_zah; /* 0x10 */
45 u8 time_mlix;
46 u8 time_dvh;
47 u8 time_dzfs;
48 u8 time_dvs;
49 u8 time_cvh;
50 u8 time_ss;
51 u8 time_cyc;
52 u32 fifo_data_32; /* 0x18 */
53 u32 fifo_data_16;
54 u32 fifo_fill;
55 u32 ata_control;
56 u32 interrupt_pending;
57 u32 interrupt_enable;
58 u32 interrupt_clear;
59 u32 fifo_alarm;
60 };
61
62 struct mxc_data_hdd_regs {
63 u32 drive_data; /* 0xa0 */
64 u32 drive_features;
65 u32 drive_sector_count;
66 u32 drive_sector_num;
67 u32 drive_cyl_low;
68 u32 drive_cyl_high;
69 u32 drive_dev_head;
70 u32 command;
71 u32 status;
72 u32 alt_status;
73 };
74
75 /* PIO timing table */
76 #define NR_PIO_SPECS 5
77 static uint16_t pio_t1[NR_PIO_SPECS] = { 70, 50, 30, 30, 25 };
78 static uint16_t pio_t2_8[NR_PIO_SPECS] = { 290, 290, 290, 80, 70 };
79 static uint16_t pio_t4[NR_PIO_SPECS] = { 30, 20, 15, 10, 10 };
80 static uint16_t pio_t9[NR_PIO_SPECS] = { 20, 15, 10, 10, 10 };
81 static uint16_t pio_tA[NR_PIO_SPECS] = { 50, 50, 50, 50, 50 };
82
83 #define REG2OFF(reg) ((((uint32_t)reg) & 0x3) * 8)
set_ata_bus_timing(unsigned char mode)84 static void set_ata_bus_timing(unsigned char mode)
85 {
86 uint32_t T = 1000000000 / mxc_get_clock(MXC_IPG_CLK);
87
88 struct mxc_ata_config_regs *ata_regs;
89 ata_regs = (struct mxc_ata_config_regs *)CONFIG_SYS_ATA_BASE_ADDR;
90
91 if (mode >= NR_PIO_SPECS)
92 return;
93
94 /* Write TIME_OFF/ON/1/2W */
95 writeb(3, &ata_regs->time_off);
96 writeb(3, &ata_regs->time_on);
97 writeb((pio_t1[mode] + T) / T, &ata_regs->time_1);
98 writeb((pio_t2_8[mode] + T) / T, &ata_regs->time_2w);
99
100 /* Write TIME_2R/AX/RDX/4 */
101 writeb((pio_t2_8[mode] + T) / T, &ata_regs->time_2r);
102 writeb((pio_tA[mode] + T) / T + 2, &ata_regs->time_ax);
103 writeb(1, &ata_regs->time_pio_rdx);
104 writeb((pio_t4[mode] + T) / T, &ata_regs->time_4);
105
106 /* Write TIME_9 ; the rest of timing registers is irrelevant for PIO */
107 writeb((pio_t9[mode] + T) / T, &ata_regs->time_9);
108 }
109
ide_preinit(void)110 int ide_preinit(void)
111 {
112 struct mxc_ata_config_regs *ata_regs;
113 ata_regs = (struct mxc_ata_config_regs *)CONFIG_SYS_ATA_BASE_ADDR;
114
115 /* 46.3.3.4 @ FSL iMX51 manual */
116 /* FIFO normal op., drive reset */
117 writel(0x80, &ata_regs->ata_control);
118 /* FIFO normal op., drive not reset */
119 writel(0xc0, &ata_regs->ata_control);
120
121 /* Configure the PIO timing */
122 set_ata_bus_timing(CONFIG_MXC_ATA_PIO_MODE);
123
124 /* 46.3.3.4 @ FSL iMX51 manual */
125 /* Drive not reset, IORDY handshake */
126 writel(0x41, &ata_regs->ata_control);
127
128 return 0;
129 }
130