xref: /linux/drivers/bcma/driver_pci.c (revision 976e3645923bdd2fe7893aae33fd7a21098bfb28)
1 /*
2  * Broadcom specific AMBA
3  * PCI Core
4  *
5  * Copyright 2005, 2011, Broadcom Corporation
6  * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
7  * Copyright 2011, 2012, Hauke Mehrtens <hauke@hauke-m.de>
8  *
9  * Licensed under the GNU/GPL. See COPYING for details.
10  */
11 
12 #include "bcma_private.h"
13 #include <linux/export.h>
14 #include <linux/bcma/bcma.h>
15 
16 /**************************************************
17  * R/W ops.
18  **************************************************/
19 
bcma_pcie_read(struct bcma_drv_pci * pc,u32 address)20 u32 bcma_pcie_read(struct bcma_drv_pci *pc, u32 address)
21 {
22 	pcicore_write32(pc, BCMA_CORE_PCI_PCIEIND_ADDR, address);
23 	pcicore_read32(pc, BCMA_CORE_PCI_PCIEIND_ADDR);
24 	return pcicore_read32(pc, BCMA_CORE_PCI_PCIEIND_DATA);
25 }
26 
bcma_pcie_write(struct bcma_drv_pci * pc,u32 address,u32 data)27 static void bcma_pcie_write(struct bcma_drv_pci *pc, u32 address, u32 data)
28 {
29 	pcicore_write32(pc, BCMA_CORE_PCI_PCIEIND_ADDR, address);
30 	pcicore_read32(pc, BCMA_CORE_PCI_PCIEIND_ADDR);
31 	pcicore_write32(pc, BCMA_CORE_PCI_PCIEIND_DATA, data);
32 }
33 
bcma_pcie_mdio_set_phy(struct bcma_drv_pci * pc,u16 phy)34 static void bcma_pcie_mdio_set_phy(struct bcma_drv_pci *pc, u16 phy)
35 {
36 	u32 v;
37 	int i;
38 
39 	v = BCMA_CORE_PCI_MDIODATA_START;
40 	v |= BCMA_CORE_PCI_MDIODATA_WRITE;
41 	v |= (BCMA_CORE_PCI_MDIODATA_DEV_ADDR <<
42 	      BCMA_CORE_PCI_MDIODATA_DEVADDR_SHF);
43 	v |= (BCMA_CORE_PCI_MDIODATA_BLK_ADDR <<
44 	      BCMA_CORE_PCI_MDIODATA_REGADDR_SHF);
45 	v |= BCMA_CORE_PCI_MDIODATA_TA;
46 	v |= (phy << 4);
47 	pcicore_write32(pc, BCMA_CORE_PCI_MDIO_DATA, v);
48 
49 	udelay(10);
50 	for (i = 0; i < 200; i++) {
51 		v = pcicore_read32(pc, BCMA_CORE_PCI_MDIO_CONTROL);
52 		if (v & BCMA_CORE_PCI_MDIOCTL_ACCESS_DONE)
53 			break;
54 		usleep_range(1000, 2000);
55 	}
56 }
57 
bcma_pcie_mdio_read(struct bcma_drv_pci * pc,u16 device,u8 address)58 static u16 bcma_pcie_mdio_read(struct bcma_drv_pci *pc, u16 device, u8 address)
59 {
60 	int max_retries = 10;
61 	u16 ret = 0;
62 	u32 v;
63 	int i;
64 
65 	/* enable mdio access to SERDES */
66 	v = BCMA_CORE_PCI_MDIOCTL_PREAM_EN;
67 	v |= BCMA_CORE_PCI_MDIOCTL_DIVISOR_VAL;
68 	pcicore_write32(pc, BCMA_CORE_PCI_MDIO_CONTROL, v);
69 
70 	if (pc->core->id.rev >= 10) {
71 		max_retries = 200;
72 		bcma_pcie_mdio_set_phy(pc, device);
73 		v = (BCMA_CORE_PCI_MDIODATA_DEV_ADDR <<
74 		     BCMA_CORE_PCI_MDIODATA_DEVADDR_SHF);
75 		v |= (address << BCMA_CORE_PCI_MDIODATA_REGADDR_SHF);
76 	} else {
77 		v = (device << BCMA_CORE_PCI_MDIODATA_DEVADDR_SHF_OLD);
78 		v |= (address << BCMA_CORE_PCI_MDIODATA_REGADDR_SHF_OLD);
79 	}
80 
81 	v |= BCMA_CORE_PCI_MDIODATA_START;
82 	v |= BCMA_CORE_PCI_MDIODATA_READ;
83 	v |= BCMA_CORE_PCI_MDIODATA_TA;
84 
85 	pcicore_write32(pc, BCMA_CORE_PCI_MDIO_DATA, v);
86 	/* Wait for the device to complete the transaction */
87 	udelay(10);
88 	for (i = 0; i < max_retries; i++) {
89 		v = pcicore_read32(pc, BCMA_CORE_PCI_MDIO_CONTROL);
90 		if (v & BCMA_CORE_PCI_MDIOCTL_ACCESS_DONE) {
91 			udelay(10);
92 			ret = pcicore_read32(pc, BCMA_CORE_PCI_MDIO_DATA);
93 			break;
94 		}
95 		usleep_range(1000, 2000);
96 	}
97 	pcicore_write32(pc, BCMA_CORE_PCI_MDIO_CONTROL, 0);
98 	return ret;
99 }
100 
bcma_pcie_mdio_write(struct bcma_drv_pci * pc,u16 device,u8 address,u16 data)101 static void bcma_pcie_mdio_write(struct bcma_drv_pci *pc, u16 device,
102 				u8 address, u16 data)
103 {
104 	int max_retries = 10;
105 	u32 v;
106 	int i;
107 
108 	/* enable mdio access to SERDES */
109 	v = BCMA_CORE_PCI_MDIOCTL_PREAM_EN;
110 	v |= BCMA_CORE_PCI_MDIOCTL_DIVISOR_VAL;
111 	pcicore_write32(pc, BCMA_CORE_PCI_MDIO_CONTROL, v);
112 
113 	if (pc->core->id.rev >= 10) {
114 		max_retries = 200;
115 		bcma_pcie_mdio_set_phy(pc, device);
116 		v = (BCMA_CORE_PCI_MDIODATA_DEV_ADDR <<
117 		     BCMA_CORE_PCI_MDIODATA_DEVADDR_SHF);
118 		v |= (address << BCMA_CORE_PCI_MDIODATA_REGADDR_SHF);
119 	} else {
120 		v = (device << BCMA_CORE_PCI_MDIODATA_DEVADDR_SHF_OLD);
121 		v |= (address << BCMA_CORE_PCI_MDIODATA_REGADDR_SHF_OLD);
122 	}
123 
124 	v |= BCMA_CORE_PCI_MDIODATA_START;
125 	v |= BCMA_CORE_PCI_MDIODATA_WRITE;
126 	v |= BCMA_CORE_PCI_MDIODATA_TA;
127 	v |= data;
128 	pcicore_write32(pc, BCMA_CORE_PCI_MDIO_DATA, v);
129 	/* Wait for the device to complete the transaction */
130 	udelay(10);
131 	for (i = 0; i < max_retries; i++) {
132 		v = pcicore_read32(pc, BCMA_CORE_PCI_MDIO_CONTROL);
133 		if (v & BCMA_CORE_PCI_MDIOCTL_ACCESS_DONE)
134 			break;
135 		usleep_range(1000, 2000);
136 	}
137 	pcicore_write32(pc, BCMA_CORE_PCI_MDIO_CONTROL, 0);
138 }
139 
bcma_pcie_mdio_writeread(struct bcma_drv_pci * pc,u16 device,u8 address,u16 data)140 static u16 bcma_pcie_mdio_writeread(struct bcma_drv_pci *pc, u16 device,
141 				    u8 address, u16 data)
142 {
143 	bcma_pcie_mdio_write(pc, device, address, data);
144 	return bcma_pcie_mdio_read(pc, device, address);
145 }
146 
147 /**************************************************
148  * Early init.
149  **************************************************/
150 
bcma_core_pci_fixcfg(struct bcma_drv_pci * pc)151 static void bcma_core_pci_fixcfg(struct bcma_drv_pci *pc)
152 {
153 	struct bcma_device *core = pc->core;
154 	u16 val16, core_index;
155 	uint regoff;
156 
157 	regoff = BCMA_CORE_PCI_SPROM(BCMA_CORE_PCI_SPROM_PI_OFFSET);
158 	core_index = (u16)core->core_index;
159 
160 	val16 = pcicore_read16(pc, regoff);
161 	if (((val16 & BCMA_CORE_PCI_SPROM_PI_MASK) >> BCMA_CORE_PCI_SPROM_PI_SHIFT)
162 	     != core_index) {
163 		val16 = (core_index << BCMA_CORE_PCI_SPROM_PI_SHIFT) |
164 			(val16 & ~BCMA_CORE_PCI_SPROM_PI_MASK);
165 		pcicore_write16(pc, regoff, val16);
166 	}
167 }
168 
169 /*
170  * Apply some early fixes required before accessing SPROM.
171  * See also si_pci_fixcfg.
172  */
bcma_core_pci_early_init(struct bcma_drv_pci * pc)173 void bcma_core_pci_early_init(struct bcma_drv_pci *pc)
174 {
175 	if (pc->early_setup_done)
176 		return;
177 
178 	pc->hostmode = bcma_core_pci_is_in_hostmode(pc);
179 	if (pc->hostmode)
180 		goto out;
181 
182 	bcma_core_pci_fixcfg(pc);
183 
184 out:
185 	pc->early_setup_done = true;
186 }
187 
188 /**************************************************
189  * Workarounds.
190  **************************************************/
191 
bcma_pcicore_polarity_workaround(struct bcma_drv_pci * pc)192 static u8 bcma_pcicore_polarity_workaround(struct bcma_drv_pci *pc)
193 {
194 	u32 tmp;
195 
196 	tmp = bcma_pcie_read(pc, BCMA_CORE_PCI_PLP_STATUSREG);
197 	if (tmp & BCMA_CORE_PCI_PLP_POLARITYINV_STAT)
198 		return BCMA_CORE_PCI_SERDES_RX_CTRL_FORCE |
199 		       BCMA_CORE_PCI_SERDES_RX_CTRL_POLARITY;
200 	else
201 		return BCMA_CORE_PCI_SERDES_RX_CTRL_FORCE;
202 }
203 
bcma_pcicore_serdes_workaround(struct bcma_drv_pci * pc)204 static void bcma_pcicore_serdes_workaround(struct bcma_drv_pci *pc)
205 {
206 	u16 tmp;
207 
208 	bcma_pcie_mdio_write(pc, BCMA_CORE_PCI_MDIODATA_DEV_RX,
209 	                     BCMA_CORE_PCI_SERDES_RX_CTRL,
210 			     bcma_pcicore_polarity_workaround(pc));
211 	tmp = bcma_pcie_mdio_read(pc, BCMA_CORE_PCI_MDIODATA_DEV_PLL,
212 	                          BCMA_CORE_PCI_SERDES_PLL_CTRL);
213 	if (tmp & BCMA_CORE_PCI_PLL_CTRL_FREQDET_EN)
214 		bcma_pcie_mdio_write(pc, BCMA_CORE_PCI_MDIODATA_DEV_PLL,
215 		                     BCMA_CORE_PCI_SERDES_PLL_CTRL,
216 		                     tmp & ~BCMA_CORE_PCI_PLL_CTRL_FREQDET_EN);
217 }
218 
219 /* Fix MISC config to allow coming out of L2/L3-Ready state w/o PRST */
220 /* Needs to happen when coming out of 'standby'/'hibernate' */
bcma_core_pci_config_fixup(struct bcma_drv_pci * pc)221 static void bcma_core_pci_config_fixup(struct bcma_drv_pci *pc)
222 {
223 	u16 val16;
224 	uint regoff;
225 
226 	regoff = BCMA_CORE_PCI_SPROM(BCMA_CORE_PCI_SPROM_MISC_CONFIG);
227 
228 	val16 = pcicore_read16(pc, regoff);
229 
230 	if (!(val16 & BCMA_CORE_PCI_SPROM_L23READY_EXIT_NOPERST)) {
231 		val16 |= BCMA_CORE_PCI_SPROM_L23READY_EXIT_NOPERST;
232 		pcicore_write16(pc, regoff, val16);
233 	}
234 }
235 
236 /**************************************************
237  * Init.
238  **************************************************/
239 
bcma_core_pci_clientmode_init(struct bcma_drv_pci * pc)240 static void bcma_core_pci_clientmode_init(struct bcma_drv_pci *pc)
241 {
242 	bcma_pcicore_serdes_workaround(pc);
243 	bcma_core_pci_config_fixup(pc);
244 }
245 
bcma_core_pci_init(struct bcma_drv_pci * pc)246 void bcma_core_pci_init(struct bcma_drv_pci *pc)
247 {
248 	if (pc->setup_done)
249 		return;
250 
251 	bcma_core_pci_early_init(pc);
252 
253 	if (pc->hostmode)
254 		bcma_core_pci_hostmode_init(pc);
255 	else
256 		bcma_core_pci_clientmode_init(pc);
257 }
258 
bcma_core_pci_power_save(struct bcma_bus * bus,bool up)259 void bcma_core_pci_power_save(struct bcma_bus *bus, bool up)
260 {
261 	struct bcma_drv_pci *pc;
262 	u16 data;
263 
264 	if (bus->hosttype != BCMA_HOSTTYPE_PCI)
265 		return;
266 
267 	pc = &bus->drv_pci[0];
268 
269 	if (pc->core->id.rev >= 15 && pc->core->id.rev <= 20) {
270 		data = up ? 0x74 : 0x7C;
271 		bcma_pcie_mdio_writeread(pc, BCMA_CORE_PCI_MDIO_BLK1,
272 					 BCMA_CORE_PCI_MDIO_BLK1_MGMT1, 0x7F64);
273 		bcma_pcie_mdio_writeread(pc, BCMA_CORE_PCI_MDIO_BLK1,
274 					 BCMA_CORE_PCI_MDIO_BLK1_MGMT3, data);
275 	} else if (pc->core->id.rev >= 21 && pc->core->id.rev <= 22) {
276 		data = up ? 0x75 : 0x7D;
277 		bcma_pcie_mdio_writeread(pc, BCMA_CORE_PCI_MDIO_BLK1,
278 					 BCMA_CORE_PCI_MDIO_BLK1_MGMT1, 0x7E65);
279 		bcma_pcie_mdio_writeread(pc, BCMA_CORE_PCI_MDIO_BLK1,
280 					 BCMA_CORE_PCI_MDIO_BLK1_MGMT3, data);
281 	}
282 }
283 EXPORT_SYMBOL_GPL(bcma_core_pci_power_save);
284 
bcma_core_pci_extend_L1timer(struct bcma_drv_pci * pc,bool extend)285 static void bcma_core_pci_extend_L1timer(struct bcma_drv_pci *pc, bool extend)
286 {
287 	u32 w;
288 
289 	w = bcma_pcie_read(pc, BCMA_CORE_PCI_DLLP_PMTHRESHREG);
290 	if (extend)
291 		w |= BCMA_CORE_PCI_ASPMTIMER_EXTEND;
292 	else
293 		w &= ~BCMA_CORE_PCI_ASPMTIMER_EXTEND;
294 	bcma_pcie_write(pc, BCMA_CORE_PCI_DLLP_PMTHRESHREG, w);
295 	bcma_pcie_read(pc, BCMA_CORE_PCI_DLLP_PMTHRESHREG);
296 }
297 
bcma_core_pci_up(struct bcma_drv_pci * pc)298 void bcma_core_pci_up(struct bcma_drv_pci *pc)
299 {
300 	bcma_core_pci_extend_L1timer(pc, true);
301 }
302 
bcma_core_pci_down(struct bcma_drv_pci * pc)303 void bcma_core_pci_down(struct bcma_drv_pci *pc)
304 {
305 	bcma_core_pci_extend_L1timer(pc, false);
306 }
307