tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
20u32 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
27static 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
34static 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
58static 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
101static 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
140static 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
151static 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 */
173void 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
184out:
185 pc->early_setup_done = true;
186}
187
188/**************************************************
189 * Workarounds.
190 **************************************************/
191
192static 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
204static 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' */
221static 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
240static 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
246void 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
259void 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}
283EXPORT_SYMBOL_GPL(bcma_core_pci_power_save);
284
285int bcma_core_pci_irq_ctl(struct bcma_drv_pci *pc, struct bcma_device *core,
286 bool enable)
287{
288 struct pci_dev *pdev;
289 u32 coremask, tmp;
290 int err = 0;
291
292 if (!pc || core->bus->hosttype != BCMA_HOSTTYPE_PCI) {
293 /* This bcma device is not on a PCI host-bus. So the IRQs are
294 * not routed through the PCI core.
295 * So we must not enable routing through the PCI core. */
296 goto out;
297 }
298
299 pdev = pc->core->bus->host_pci;
300
301 err = pci_read_config_dword(pdev, BCMA_PCI_IRQMASK, &tmp);
302 if (err)
303 goto out;
304
305 coremask = BIT(core->core_index) << 8;
306 if (enable)
307 tmp |= coremask;
308 else
309 tmp &= ~coremask;
310
311 err = pci_write_config_dword(pdev, BCMA_PCI_IRQMASK, tmp);
312
313out:
314 return err;
315}
316EXPORT_SYMBOL_GPL(bcma_core_pci_irq_ctl);
317
318static void bcma_core_pci_extend_L1timer(struct bcma_drv_pci *pc, bool extend)
319{
320 u32 w;
321
322 w = bcma_pcie_read(pc, BCMA_CORE_PCI_DLLP_PMTHRESHREG);
323 if (extend)
324 w |= BCMA_CORE_PCI_ASPMTIMER_EXTEND;
325 else
326 w &= ~BCMA_CORE_PCI_ASPMTIMER_EXTEND;
327 bcma_pcie_write(pc, BCMA_CORE_PCI_DLLP_PMTHRESHREG, w);
328 bcma_pcie_read(pc, BCMA_CORE_PCI_DLLP_PMTHRESHREG);
329}
330
331void bcma_core_pci_up(struct bcma_bus *bus)
332{
333 struct bcma_drv_pci *pc;
334
335 if (bus->hosttype != BCMA_HOSTTYPE_PCI)
336 return;
337
338 pc = &bus->drv_pci[0];
339
340 bcma_core_pci_extend_L1timer(pc, true);
341}
342EXPORT_SYMBOL_GPL(bcma_core_pci_up);
343
344void bcma_core_pci_down(struct bcma_bus *bus)
345{
346 struct bcma_drv_pci *pc;
347
348 if (bus->hosttype != BCMA_HOSTTYPE_PCI)
349 return;
350
351 pc = &bus->drv_pci[0];
352
353 bcma_core_pci_extend_L1timer(pc, false);
354}
355EXPORT_SYMBOL_GPL(bcma_core_pci_down);