1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Driver for Realtek PCI-Express card reader
3  *
4  * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
5  *
6  * Author:
7  *   Wei WANG <wei_wang@realsil.com.cn>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/delay.h>
12 #include <linux/rtsx_pci.h>
13 
14 #include "rtsx_pcr.h"
15 
16 static u8 rts5209_get_ic_version(struct rtsx_pcr *pcr)
17 {
18 	u8 val;
19 
20 	val = rtsx_pci_readb(pcr, 0x1C);
21 	return val & 0x0F;
22 }
23 
24 static void rts5209_fetch_vendor_settings(struct rtsx_pcr *pcr)
25 {
26 	struct pci_dev *pdev = pcr->pci;
27 	u32 reg;
28 
29 	pci_read_config_dword(pdev, PCR_SETTING_REG1, &reg);
30 	pcr_dbg(pcr, "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG1, reg);
31 
32 	if (rts5209_vendor_setting1_valid(reg)) {
33 		if (rts5209_reg_check_ms_pmos(reg))
34 			pcr->flags |= PCR_MS_PMOS;
35 		pcr->aspm_en = rts5209_reg_to_aspm(reg);
36 	}
37 
38 	pci_read_config_dword(pdev, PCR_SETTING_REG2, &reg);
39 	pcr_dbg(pcr, "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG2, reg);
40 
41 	if (rts5209_vendor_setting2_valid(reg)) {
42 		pcr->sd30_drive_sel_1v8 =
43 			rts5209_reg_to_sd30_drive_sel_1v8(reg);
44 		pcr->sd30_drive_sel_3v3 =
45 			rts5209_reg_to_sd30_drive_sel_3v3(reg);
46 		pcr->card_drive_sel = rts5209_reg_to_card_drive_sel(reg);
47 	}
48 }
49 
50 static void rts5209_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
51 {
52 	rtsx_pci_write_register(pcr, FPDCTL, 0x07, 0x07);
53 }
54 
55 static int rts5209_extra_init_hw(struct rtsx_pcr *pcr)
56 {
57 	rtsx_pci_init_cmd(pcr);
58 
59 	/* Turn off LED */
60 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO, 0xFF, 0x03);
61 	/* Reset ASPM state to default value */
62 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, ASPM_FORCE_CTL, 0x3F, 0);
63 	/* Force CLKREQ# PIN to drive 0 to request clock */
64 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PETXCFG, 0x08, 0x08);
65 	/* Configure GPIO as output */
66 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO_DIR, 0xFF, 0x03);
67 	/* Configure driving */
68 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_DRIVE_SEL,
69 			0xFF, pcr->sd30_drive_sel_3v3);
70 
71 	return rtsx_pci_send_cmd(pcr, 100);
72 }
73 
74 static int rts5209_optimize_phy(struct rtsx_pcr *pcr)
75 {
76 	return rtsx_pci_write_phy_register(pcr, 0x00, 0xB966);
77 }
78 
79 static int rts5209_turn_on_led(struct rtsx_pcr *pcr)
80 {
81 	return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x00);
82 }
83 
84 static int rts5209_turn_off_led(struct rtsx_pcr *pcr)
85 {
86 	return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x01);
87 }
88 
89 static int rts5209_enable_auto_blink(struct rtsx_pcr *pcr)
90 {
91 	return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0xFF, 0x0D);
92 }
93 
94 static int rts5209_disable_auto_blink(struct rtsx_pcr *pcr)
95 {
96 	return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0x08, 0x00);
97 }
98 
99 static int rts5209_card_power_on(struct rtsx_pcr *pcr, int card)
100 {
101 	int err;
102 	u8 pwr_mask, partial_pwr_on, pwr_on;
103 
104 	pwr_mask = SD_POWER_MASK;
105 	partial_pwr_on = SD_PARTIAL_POWER_ON;
106 	pwr_on = SD_POWER_ON;
107 
108 	if ((pcr->flags & PCR_MS_PMOS) && (card == RTSX_MS_CARD)) {
109 		pwr_mask = MS_POWER_MASK;
110 		partial_pwr_on = MS_PARTIAL_POWER_ON;
111 		pwr_on = MS_POWER_ON;
112 	}
113 
114 	rtsx_pci_init_cmd(pcr);
115 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
116 			pwr_mask, partial_pwr_on);
117 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
118 			LDO3318_PWR_MASK, 0x04);
119 	err = rtsx_pci_send_cmd(pcr, 100);
120 	if (err < 0)
121 		return err;
122 
123 	/* To avoid too large in-rush current */
124 	udelay(150);
125 
126 	rtsx_pci_init_cmd(pcr);
127 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL, pwr_mask, pwr_on);
128 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
129 			LDO3318_PWR_MASK, 0x00);
130 	return rtsx_pci_send_cmd(pcr, 100);
131 }
132 
133 static int rts5209_card_power_off(struct rtsx_pcr *pcr, int card)
134 {
135 	u8 pwr_mask, pwr_off;
136 
137 	pwr_mask = SD_POWER_MASK;
138 	pwr_off = SD_POWER_OFF;
139 
140 	if ((pcr->flags & PCR_MS_PMOS) && (card == RTSX_MS_CARD)) {
141 		pwr_mask = MS_POWER_MASK;
142 		pwr_off = MS_POWER_OFF;
143 	}
144 
145 	rtsx_pci_init_cmd(pcr);
146 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
147 			pwr_mask | PMOS_STRG_MASK, pwr_off | PMOS_STRG_400mA);
148 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
149 			LDO3318_PWR_MASK, 0x06);
150 	return rtsx_pci_send_cmd(pcr, 100);
151 }
152 
153 static int rts5209_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
154 {
155 	int err;
156 
157 	if (voltage == OUTPUT_3V3) {
158 		err = rtsx_pci_write_register(pcr,
159 				SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_3v3);
160 		if (err < 0)
161 			return err;
162 		err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
163 		if (err < 0)
164 			return err;
165 	} else if (voltage == OUTPUT_1V8) {
166 		err = rtsx_pci_write_register(pcr,
167 				SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_1v8);
168 		if (err < 0)
169 			return err;
170 		err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C40 | 0x24);
171 		if (err < 0)
172 			return err;
173 	} else {
174 		return -EINVAL;
175 	}
176 
177 	return 0;
178 }
179 
180 static const struct pcr_ops rts5209_pcr_ops = {
181 	.fetch_vendor_settings = rts5209_fetch_vendor_settings,
182 	.extra_init_hw = rts5209_extra_init_hw,
183 	.optimize_phy = rts5209_optimize_phy,
184 	.turn_on_led = rts5209_turn_on_led,
185 	.turn_off_led = rts5209_turn_off_led,
186 	.enable_auto_blink = rts5209_enable_auto_blink,
187 	.disable_auto_blink = rts5209_disable_auto_blink,
188 	.card_power_on = rts5209_card_power_on,
189 	.card_power_off = rts5209_card_power_off,
190 	.switch_output_voltage = rts5209_switch_output_voltage,
191 	.cd_deglitch = NULL,
192 	.conv_clk_and_div_n = NULL,
193 	.force_power_down = rts5209_force_power_down,
194 };
195 
196 /* SD Pull Control Enable:
197  *     SD_DAT[3:0] ==> pull up
198  *     SD_CD       ==> pull up
199  *     SD_WP       ==> pull up
200  *     SD_CMD      ==> pull up
201  *     SD_CLK      ==> pull down
202  */
203 static const u32 rts5209_sd_pull_ctl_enable_tbl[] = {
204 	RTSX_REG_PAIR(CARD_PULL_CTL1, 0xAA),
205 	RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
206 	RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
207 	0,
208 };
209 
210 /* SD Pull Control Disable:
211  *     SD_DAT[3:0] ==> pull down
212  *     SD_CD       ==> pull up
213  *     SD_WP       ==> pull down
214  *     SD_CMD      ==> pull down
215  *     SD_CLK      ==> pull down
216  */
217 static const u32 rts5209_sd_pull_ctl_disable_tbl[] = {
218 	RTSX_REG_PAIR(CARD_PULL_CTL1, 0x55),
219 	RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
220 	RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
221 	0,
222 };
223 
224 /* MS Pull Control Enable:
225  *     MS CD       ==> pull up
226  *     others      ==> pull down
227  */
228 static const u32 rts5209_ms_pull_ctl_enable_tbl[] = {
229 	RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
230 	RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
231 	RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
232 	0,
233 };
234 
235 /* MS Pull Control Disable:
236  *     MS CD       ==> pull up
237  *     others      ==> pull down
238  */
239 static const u32 rts5209_ms_pull_ctl_disable_tbl[] = {
240 	RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
241 	RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
242 	RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
243 	0,
244 };
245 
246 void rts5209_init_params(struct rtsx_pcr *pcr)
247 {
248 	pcr->extra_caps = EXTRA_CAPS_SD_SDR50 |
249 		EXTRA_CAPS_SD_SDR104 | EXTRA_CAPS_MMC_8BIT;
250 	pcr->num_slots = 2;
251 	pcr->ops = &rts5209_pcr_ops;
252 
253 	pcr->flags = 0;
254 	pcr->card_drive_sel = RTS5209_CARD_DRIVE_DEFAULT;
255 	pcr->sd30_drive_sel_1v8 = DRIVER_TYPE_B;
256 	pcr->sd30_drive_sel_3v3 = DRIVER_TYPE_D;
257 	pcr->aspm_en = ASPM_L1_EN;
258 	pcr->tx_initial_phase = SET_CLOCK_PHASE(27, 27, 16);
259 	pcr->rx_initial_phase = SET_CLOCK_PHASE(24, 6, 5);
260 
261 	pcr->ic_version = rts5209_get_ic_version(pcr);
262 	pcr->sd_pull_ctl_enable_tbl = rts5209_sd_pull_ctl_enable_tbl;
263 	pcr->sd_pull_ctl_disable_tbl = rts5209_sd_pull_ctl_disable_tbl;
264 	pcr->ms_pull_ctl_enable_tbl = rts5209_ms_pull_ctl_enable_tbl;
265 	pcr->ms_pull_ctl_disable_tbl = rts5209_ms_pull_ctl_disable_tbl;
266 }
267