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[linux-imx.git] / drivers / mfd / rts5209.c
1 /* Driver for Realtek PCI-Express card reader
2  *
3  * Copyright(c) 2009 Realtek Semiconductor Corp. All rights reserved.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License as published by the
7  * Free Software Foundation; either version 2, or (at your option) any
8  * later version.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, see <http://www.gnu.org/licenses/>.
17  *
18  * Author:
19  *   Wei WANG <wei_wang@realsil.com.cn>
20  *   No. 450, Shenhu Road, Suzhou Industry Park, Suzhou, China
21  */
22
23 #include <linux/module.h>
24 #include <linux/delay.h>
25 #include <linux/mfd/rtsx_pci.h>
26
27 #include "rtsx_pcr.h"
28
29 static u8 rts5209_get_ic_version(struct rtsx_pcr *pcr)
30 {
31         u8 val;
32
33         val = rtsx_pci_readb(pcr, 0x1C);
34         return val & 0x0F;
35 }
36
37 static void rts5209_init_vendor_cfg(struct rtsx_pcr *pcr)
38 {
39         u32 val;
40
41         rtsx_pci_read_config_dword(pcr, 0x724, &val);
42         dev_dbg(&(pcr->pci->dev), "Cfg 0x724: 0x%x\n", val);
43
44         if (!(val & 0x80)) {
45                 if (val & 0x08)
46                         pcr->ms_pmos = false;
47                 else
48                         pcr->ms_pmos = true;
49         }
50 }
51
52 static int rts5209_extra_init_hw(struct rtsx_pcr *pcr)
53 {
54         rtsx_pci_init_cmd(pcr);
55
56         /* Turn off LED */
57         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO, 0xFF, 0x03);
58         /* Configure GPIO as output */
59         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO_DIR, 0xFF, 0x03);
60
61         return rtsx_pci_send_cmd(pcr, 100);
62 }
63
64 static int rts5209_optimize_phy(struct rtsx_pcr *pcr)
65 {
66         return rtsx_pci_write_phy_register(pcr, 0x00, 0xB966);
67 }
68
69 static int rts5209_turn_on_led(struct rtsx_pcr *pcr)
70 {
71         return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x00);
72 }
73
74 static int rts5209_turn_off_led(struct rtsx_pcr *pcr)
75 {
76         return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x01);
77 }
78
79 static int rts5209_enable_auto_blink(struct rtsx_pcr *pcr)
80 {
81         return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0xFF, 0x0D);
82 }
83
84 static int rts5209_disable_auto_blink(struct rtsx_pcr *pcr)
85 {
86         return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0x08, 0x00);
87 }
88
89 static int rts5209_card_power_on(struct rtsx_pcr *pcr, int card)
90 {
91         int err;
92         u8 pwr_mask, partial_pwr_on, pwr_on;
93
94         pwr_mask = SD_POWER_MASK;
95         partial_pwr_on = SD_PARTIAL_POWER_ON;
96         pwr_on = SD_POWER_ON;
97
98         if (pcr->ms_pmos && (card == RTSX_MS_CARD)) {
99                 pwr_mask = MS_POWER_MASK;
100                 partial_pwr_on = MS_PARTIAL_POWER_ON;
101                 pwr_on = MS_POWER_ON;
102         }
103
104         rtsx_pci_init_cmd(pcr);
105         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
106                         pwr_mask, partial_pwr_on);
107         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
108                         LDO3318_PWR_MASK, 0x04);
109         err = rtsx_pci_send_cmd(pcr, 100);
110         if (err < 0)
111                 return err;
112
113         /* To avoid too large in-rush current */
114         udelay(150);
115
116         rtsx_pci_init_cmd(pcr);
117         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL, pwr_mask, pwr_on);
118         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
119                         LDO3318_PWR_MASK, 0x00);
120         err = rtsx_pci_send_cmd(pcr, 100);
121         if (err < 0)
122                 return err;
123
124         return 0;
125 }
126
127 static int rts5209_card_power_off(struct rtsx_pcr *pcr, int card)
128 {
129         u8 pwr_mask, pwr_off;
130
131         pwr_mask = SD_POWER_MASK;
132         pwr_off = SD_POWER_OFF;
133
134         if (pcr->ms_pmos && (card == RTSX_MS_CARD)) {
135                 pwr_mask = MS_POWER_MASK;
136                 pwr_off = MS_POWER_OFF;
137         }
138
139         rtsx_pci_init_cmd(pcr);
140         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
141                         pwr_mask | PMOS_STRG_MASK, pwr_off | PMOS_STRG_400mA);
142         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
143                         LDO3318_PWR_MASK, 0X06);
144         return rtsx_pci_send_cmd(pcr, 100);
145 }
146
147 static int rts5209_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
148 {
149         int err;
150
151         if (voltage == OUTPUT_3V3) {
152                 err = rtsx_pci_write_register(pcr,
153                                 SD30_DRIVE_SEL, 0x07, DRIVER_TYPE_D);
154                 if (err < 0)
155                         return err;
156                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
157                 if (err < 0)
158                         return err;
159         } else if (voltage == OUTPUT_1V8) {
160                 err = rtsx_pci_write_register(pcr,
161                                 SD30_DRIVE_SEL, 0x07, DRIVER_TYPE_B);
162                 if (err < 0)
163                         return err;
164                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C40 | 0x24);
165                 if (err < 0)
166                         return err;
167         } else {
168                 return -EINVAL;
169         }
170
171         return 0;
172 }
173
174 static const struct pcr_ops rts5209_pcr_ops = {
175         .extra_init_hw = rts5209_extra_init_hw,
176         .optimize_phy = rts5209_optimize_phy,
177         .turn_on_led = rts5209_turn_on_led,
178         .turn_off_led = rts5209_turn_off_led,
179         .enable_auto_blink = rts5209_enable_auto_blink,
180         .disable_auto_blink = rts5209_disable_auto_blink,
181         .card_power_on = rts5209_card_power_on,
182         .card_power_off = rts5209_card_power_off,
183         .switch_output_voltage = rts5209_switch_output_voltage,
184         .cd_deglitch = NULL,
185         .conv_clk_and_div_n = NULL,
186 };
187
188 /* SD Pull Control Enable:
189  *     SD_DAT[3:0] ==> pull up
190  *     SD_CD       ==> pull up
191  *     SD_WP       ==> pull up
192  *     SD_CMD      ==> pull up
193  *     SD_CLK      ==> pull down
194  */
195 static const u32 rts5209_sd_pull_ctl_enable_tbl[] = {
196         RTSX_REG_PAIR(CARD_PULL_CTL1, 0xAA),
197         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
198         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
199         0,
200 };
201
202 /* SD Pull Control Disable:
203  *     SD_DAT[3:0] ==> pull down
204  *     SD_CD       ==> pull up
205  *     SD_WP       ==> pull down
206  *     SD_CMD      ==> pull down
207  *     SD_CLK      ==> pull down
208  */
209 static const u32 rts5209_sd_pull_ctl_disable_tbl[] = {
210         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x55),
211         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
212         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
213         0,
214 };
215
216 /* MS Pull Control Enable:
217  *     MS CD       ==> pull up
218  *     others      ==> pull down
219  */
220 static const u32 rts5209_ms_pull_ctl_enable_tbl[] = {
221         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
222         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
223         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
224         0,
225 };
226
227 /* MS Pull Control Disable:
228  *     MS CD       ==> pull up
229  *     others      ==> pull down
230  */
231 static const u32 rts5209_ms_pull_ctl_disable_tbl[] = {
232         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
233         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
234         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
235         0,
236 };
237
238 void rts5209_init_params(struct rtsx_pcr *pcr)
239 {
240         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 |
241                 EXTRA_CAPS_SD_SDR104 | EXTRA_CAPS_MMC_8BIT;
242         pcr->num_slots = 2;
243         pcr->ops = &rts5209_pcr_ops;
244
245         rts5209_init_vendor_cfg(pcr);
246
247         pcr->ic_version = rts5209_get_ic_version(pcr);
248         pcr->sd_pull_ctl_enable_tbl = rts5209_sd_pull_ctl_enable_tbl;
249         pcr->sd_pull_ctl_disable_tbl = rts5209_sd_pull_ctl_disable_tbl;
250         pcr->ms_pull_ctl_enable_tbl = rts5209_ms_pull_ctl_enable_tbl;
251         pcr->ms_pull_ctl_disable_tbl = rts5209_ms_pull_ctl_disable_tbl;
252 }