1 | /* |
---|
2 | * ioc_ata.c - ATA driver implementation |
---|
3 | * |
---|
4 | * Copyright (c) 2017 Maxime Villard |
---|
5 | * |
---|
6 | * This file is part of ALMOS-MKH. |
---|
7 | * |
---|
8 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
---|
9 | * under the terms of the GNU General Public License as published by |
---|
10 | * the Free Software Foundation; version 2.0 of the License. |
---|
11 | * |
---|
12 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
---|
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|
15 | * General Public License for more details. |
---|
16 | * |
---|
17 | * You should have received a copy of the GNU General Public License |
---|
18 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
---|
19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
---|
20 | */ |
---|
21 | |
---|
22 | #include <chdev.h> |
---|
23 | #include <dev_ioc.h> |
---|
24 | #include <hal_drivers.h> |
---|
25 | #include <hal_kentry.h> |
---|
26 | #include <thread.h> |
---|
27 | #include <spinlock.h> |
---|
28 | |
---|
29 | #include <hal_internal.h> |
---|
30 | |
---|
31 | #define PIO_ATA_CBR_BASE 0x1F0 |
---|
32 | # define ATA_DATA 0x000 |
---|
33 | # define ATA_ERRFEAT 0x001 /* two regs */ |
---|
34 | # define ATA_SCR 0x002 |
---|
35 | # define ATA_SNR 0x003 /* lba0 */ |
---|
36 | # define ATA_CLR 0x004 /* lba1 */ |
---|
37 | # define ATA_CHR 0x005 /* lba2 */ |
---|
38 | # define ATA_DHR 0x006 /* drive | lba3 */ |
---|
39 | # define ATA_SR 0x007 |
---|
40 | # define ATA_SR_ERR 0x01 |
---|
41 | # define ATA_SR_IDX 0x02 |
---|
42 | # define ATA_SR_CORR 0x04 |
---|
43 | # define ATA_SR_DRQ 0x08 |
---|
44 | # define ATA_SR_DSC 0x10 |
---|
45 | # define ATA_SR_DF 0x20 |
---|
46 | # define ATA_SR_DRDY 0x40 |
---|
47 | # define ATA_SR_BSY 0x80 |
---|
48 | # define ATA_CR 0x007 /* two regs */ |
---|
49 | |
---|
50 | #define ATA_CMD_READ_SECTORS_RETRY 0x20 |
---|
51 | #define ATA_CMD_READ_SECTORS_NORETRY 0x21 |
---|
52 | #define ATA_CMD_WRITE_SECTORS_RETRY 0x30 |
---|
53 | #define ATA_CMD_WRITE_SECTORS_NORETRY 0x31 |
---|
54 | #define ATA_CMD_IDENTIFY 0xEC |
---|
55 | |
---|
56 | static inline uint16_t ata_data_read() |
---|
57 | { |
---|
58 | return in16(PIO_ATA_CBR_BASE + ATA_DATA); |
---|
59 | } |
---|
60 | |
---|
61 | static inline void ata_data_write(uint16_t val) |
---|
62 | { |
---|
63 | out16(PIO_ATA_CBR_BASE + ATA_DATA, val); |
---|
64 | } |
---|
65 | |
---|
66 | static inline uint8_t ata_cbr_read(uint32_t reg) |
---|
67 | { |
---|
68 | return in8(PIO_ATA_CBR_BASE + reg); |
---|
69 | } |
---|
70 | |
---|
71 | static inline void ata_cbr_write(uint32_t reg, uint8_t val) |
---|
72 | { |
---|
73 | out8(PIO_ATA_CBR_BASE + reg, val); |
---|
74 | } |
---|
75 | |
---|
76 | static inline int ata_wait() |
---|
77 | { |
---|
78 | uint8_t status; |
---|
79 | |
---|
80 | while (1) { |
---|
81 | status = ata_cbr_read(ATA_SR); |
---|
82 | if (status & ATA_SR_DRQ) |
---|
83 | break; |
---|
84 | } |
---|
85 | |
---|
86 | return ((status & ATA_SR_ERR) ? -1 : 0); |
---|
87 | } |
---|
88 | |
---|
89 | static void ata_prepare(uint8_t slave, uint32_t lba, uint8_t count) |
---|
90 | { |
---|
91 | ata_cbr_write(ATA_ERRFEAT, 0x00); /* NULL byte to port 0x1F1 */ |
---|
92 | ata_cbr_write(ATA_SCR, count); /* sector count */ |
---|
93 | |
---|
94 | /* set the lba */ |
---|
95 | ata_cbr_write(ATA_SNR, (lba >> 0) & 0xFF); |
---|
96 | ata_cbr_write(ATA_CLR, (lba >> 8) & 0xFF); |
---|
97 | ata_cbr_write(ATA_CHR, (lba >> 16)& 0xFF); |
---|
98 | |
---|
99 | /* set the drive and lba3 */ |
---|
100 | ata_cbr_write(ATA_DHR, 0xE0 | (slave << 4) | ((lba >> 24) & 0x0F)); |
---|
101 | } |
---|
102 | |
---|
103 | static int ata_read(uint8_t count, char *buf) |
---|
104 | { |
---|
105 | uint16_t tmpword; |
---|
106 | size_t idx, n; |
---|
107 | |
---|
108 | for (n = 0; n < count; n++) { |
---|
109 | /* wait for the drive to signal that it's ready */ |
---|
110 | if (ata_wait() == -1) |
---|
111 | x86_panic("ata_wait"); |
---|
112 | |
---|
113 | /* read one block */ |
---|
114 | for (idx = 0; idx < 256; idx++) { |
---|
115 | tmpword = ata_data_read(); |
---|
116 | buf[n * 512 + idx * 2] = (uint8_t)(tmpword & 0xFF); |
---|
117 | buf[n * 512 + idx * 2 + 1] = (uint8_t)(tmpword >> 8); |
---|
118 | } |
---|
119 | } |
---|
120 | |
---|
121 | return 0; |
---|
122 | } |
---|
123 | |
---|
124 | static int ata_write(uint8_t count, char *buf) |
---|
125 | { |
---|
126 | uint16_t tmpword; |
---|
127 | size_t idx, n; |
---|
128 | |
---|
129 | for (n = 0; n < count; n++) { |
---|
130 | /* wait for the drive to signal that it's ready */ |
---|
131 | if (ata_wait() == -1) |
---|
132 | x86_panic("ata_wait"); |
---|
133 | |
---|
134 | /* write one block */ |
---|
135 | for (idx = 0; idx < 256; idx++) { |
---|
136 | tmpword = (buf[n * 512 + idx * 2 + 1] << 8) | |
---|
137 | buf[n * 512 + idx * 2]; |
---|
138 | ata_data_write(tmpword); |
---|
139 | } |
---|
140 | } |
---|
141 | |
---|
142 | return 0; |
---|
143 | } |
---|
144 | |
---|
145 | static uint16_t bswap16(uint16_t x) |
---|
146 | { |
---|
147 | return ((x << 8) & 0xFF00) | ((x >> 8) & 0x00FF); |
---|
148 | } |
---|
149 | |
---|
150 | static void ata_init() |
---|
151 | { |
---|
152 | uint8_t id[512]; |
---|
153 | uint16_t tmpw, *p; |
---|
154 | size_t idx; |
---|
155 | char *model; |
---|
156 | uint8_t ncyl; |
---|
157 | int ret; |
---|
158 | |
---|
159 | ata_prepare(0, 0, 0); |
---|
160 | ata_cbr_write(ATA_CR, ATA_CMD_IDENTIFY); |
---|
161 | |
---|
162 | /* wait for the drive to signal that it's ready */ |
---|
163 | ret = ata_wait(); |
---|
164 | if (ret == -1) |
---|
165 | x86_panic("-> unable to identify ATA\n"); |
---|
166 | |
---|
167 | for (idx = 0; idx < 256; idx++) { |
---|
168 | tmpw = ata_data_read(); |
---|
169 | id[idx * 2] = (uint8_t)((tmpw >> 0) & 0xFF); |
---|
170 | id[idx * 2 + 1] = (uint8_t)((tmpw >> 8) & 0xFF); |
---|
171 | } |
---|
172 | |
---|
173 | ncyl = id[0] & 0x1; |
---|
174 | x86_printf("-> cyl: %z\n", (uint64_t)ncyl); |
---|
175 | |
---|
176 | for (idx = 27*2; idx < 46*2; idx += 2) { |
---|
177 | p = (uint16_t *)(&id[idx]); |
---|
178 | *p = bswap16(*p); |
---|
179 | } |
---|
180 | |
---|
181 | model = &id[27*2]; |
---|
182 | id[46*2] = '\0'; |
---|
183 | x86_printf("-> ATA model: '%s'\n", model); |
---|
184 | } |
---|
185 | |
---|
186 | /* -------------------------------------------------------------------------- */ |
---|
187 | |
---|
188 | static void ioc_ata_cmd(xptr_t th_xp); |
---|
189 | extern void x86_ioapic_ata0(); |
---|
190 | |
---|
191 | void ioc_ata_init(chdev_t *chdev) |
---|
192 | { |
---|
193 | chdev->cmd = &ioc_ata_cmd; |
---|
194 | chdev->isr = &x86_ioapic_ata0; |
---|
195 | ata_init(); |
---|
196 | } |
---|
197 | |
---|
198 | static void ioc_ata_cmd(xptr_t th_xp) |
---|
199 | { |
---|
200 | uint32_t cmd_type; // IOC_READ / IOC_WRITE / IOC_SYNC_READ |
---|
201 | uint32_t lba; // command argument |
---|
202 | uint32_t count; // command argument |
---|
203 | xptr_t buf_xp; // command argument |
---|
204 | |
---|
205 | // get client thread cluster and local pointer |
---|
206 | cxy_t th_cxy = GET_CXY( th_xp ); |
---|
207 | thread_t * th_ptr = (thread_t *)GET_PTR( th_xp ); |
---|
208 | |
---|
209 | // get command arguments and extended pointer on IOC device |
---|
210 | cmd_type = hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.ioc.type ) ); |
---|
211 | lba = hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.ioc.lba ) ); |
---|
212 | count = hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.ioc.count ) ); |
---|
213 | buf_xp = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->command.ioc.buf_xp ) ); |
---|
214 | |
---|
215 | /* execute operation */ |
---|
216 | ata_prepare(0, lba, count); |
---|
217 | if (cmd_type == IOC_WRITE) { |
---|
218 | ata_cbr_write(ATA_CR, ATA_CMD_WRITE_SECTORS_RETRY); |
---|
219 | } else { |
---|
220 | ata_cbr_write(ATA_CR, ATA_CMD_READ_SECTORS_RETRY); |
---|
221 | } |
---|
222 | |
---|
223 | /* waiting policy depends on the command type */ |
---|
224 | if (cmd_type == IOC_SYNC_READ) { |
---|
225 | ata_read(count, (char *)buf_xp); |
---|
226 | } else { |
---|
227 | x86_panic("!IOC_SYNC_READ not supported"); |
---|
228 | } |
---|
229 | } |
---|
230 | |
---|
231 | void ioc_ata_isr(hal_cpu_context_t *ctx) |
---|
232 | { |
---|
233 | x86_printf("rip = %Z\n", ctx->tf_rip); |
---|
234 | |
---|
235 | x86_panic((char *)__func__); |
---|
236 | } |
---|
237 | |
---|