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Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +11001#include <linux/kernel.h>
2#include <linux/serial.h>
3#include <linux/serial_8250.h>
4#include <linux/serial_core.h>
5#include <linux/console.h>
6#include <linux/pci.h>
Grant Likely22ae7822010-07-29 11:49:01 -06007#include <linux/of_address.h>
Paul Gortmaker1a7507c2008-01-24 11:59:12 -05008#include <linux/of_device.h>
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +11009#include <asm/io.h>
10#include <asm/mmu.h>
11#include <asm/prom.h>
12#include <asm/serial.h>
13#include <asm/udbg.h>
14#include <asm/pci-bridge.h>
15#include <asm/ppc-pci.h>
16
17#undef DEBUG
18
19#ifdef DEBUG
20#define DBG(fmt...) do { printk(fmt); } while(0)
21#else
22#define DBG(fmt...) do { } while(0)
23#endif
24
25#define MAX_LEGACY_SERIAL_PORTS 8
26
27static struct plat_serial8250_port
28legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
29static struct legacy_serial_info {
30 struct device_node *np;
31 unsigned int speed;
32 unsigned int clock;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +100033 int irq_check_parent;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +110034 phys_addr_t taddr;
35} legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS];
Paul Gortmaker1a7507c2008-01-24 11:59:12 -050036
Benjamin Herrenschmidt3bc5ab92008-07-07 16:39:50 +100037static struct __initdata of_device_id legacy_serial_parents[] = {
Paul Gortmaker1a7507c2008-01-24 11:59:12 -050038 {.type = "soc",},
39 {.type = "tsi-bridge",},
Michael Ellermanf5903ed2008-02-05 23:01:50 +110040 {.type = "opb", },
41 {.compatible = "ibm,opb",},
Paul Gortmaker1a7507c2008-01-24 11:59:12 -050042 {.compatible = "simple-bus",},
43 {.compatible = "wrs,epld-localbus",},
Benjamin Herrenschmidt3bc5ab92008-07-07 16:39:50 +100044 {},
Paul Gortmaker1a7507c2008-01-24 11:59:12 -050045};
46
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +110047static unsigned int legacy_serial_count;
48static int legacy_serial_console = -1;
49
50static int __init add_legacy_port(struct device_node *np, int want_index,
51 int iotype, phys_addr_t base,
Kumar Galab580d462005-12-20 16:16:52 -060052 phys_addr_t taddr, unsigned long irq,
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +100053 upf_t flags, int irq_check_parent)
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +110054{
Jeremy Kerra7f67bd2006-07-12 15:35:54 +100055 const u32 *clk, *spd;
56 u32 clock = BASE_BAUD * 16;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +110057 int index;
58
59 /* get clock freq. if present */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +100060 clk = of_get_property(np, "clock-frequency", NULL);
David Woodhouse31df1672005-11-24 17:08:56 +000061 if (clk && *clk)
62 clock = *clk;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +110063
64 /* get default speed if present */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +100065 spd = of_get_property(np, "current-speed", NULL);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +110066
67 /* If we have a location index, then try to use it */
68 if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
69 index = want_index;
70 else
71 index = legacy_serial_count;
72
73 /* if our index is still out of range, that mean that
74 * array is full, we could scan for a free slot but that
75 * make little sense to bother, just skip the port
76 */
77 if (index >= MAX_LEGACY_SERIAL_PORTS)
78 return -1;
79 if (index >= legacy_serial_count)
80 legacy_serial_count = index + 1;
81
82 /* Check if there is a port who already claimed our slot */
83 if (legacy_serial_infos[index].np != 0) {
84 /* if we still have some room, move it, else override */
85 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +100086 printk(KERN_DEBUG "Moved legacy port %d -> %d\n",
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +110087 index, legacy_serial_count);
88 legacy_serial_ports[legacy_serial_count] =
89 legacy_serial_ports[index];
90 legacy_serial_infos[legacy_serial_count] =
91 legacy_serial_infos[index];
92 legacy_serial_count++;
93 } else {
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +100094 printk(KERN_DEBUG "Replacing legacy port %d\n", index);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +110095 }
96 }
97
98 /* Now fill the entry */
99 memset(&legacy_serial_ports[index], 0,
100 sizeof(struct plat_serial8250_port));
101 if (iotype == UPIO_PORT)
102 legacy_serial_ports[index].iobase = base;
103 else
Benjamin Herrenschmidt8dacaed2005-11-29 11:21:59 +1100104 legacy_serial_ports[index].mapbase = base;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100105 legacy_serial_ports[index].iotype = iotype;
106 legacy_serial_ports[index].uartclk = clock;
107 legacy_serial_ports[index].irq = irq;
Kumar Galab580d462005-12-20 16:16:52 -0600108 legacy_serial_ports[index].flags = flags;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100109 legacy_serial_infos[index].taddr = taddr;
110 legacy_serial_infos[index].np = of_node_get(np);
111 legacy_serial_infos[index].clock = clock;
112 legacy_serial_infos[index].speed = spd ? *spd : 0;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000113 legacy_serial_infos[index].irq_check_parent = irq_check_parent;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100114
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000115 printk(KERN_DEBUG "Found legacy serial port %d for %s\n",
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100116 index, np->full_name);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000117 printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100118 (iotype == UPIO_PORT) ? "port" : "mem",
119 (unsigned long long)base, (unsigned long long)taddr, irq,
120 legacy_serial_ports[index].uartclk,
121 legacy_serial_infos[index].speed);
122
123 return index;
124}
125
Kumar Galab580d462005-12-20 16:16:52 -0600126static int __init add_legacy_soc_port(struct device_node *np,
127 struct device_node *soc_dev)
128{
Benjamin Herrenschmidtf704b8d2006-07-04 14:14:07 +1000129 u64 addr;
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000130 const u32 *addrp;
David Gibsonabb4a232007-05-06 14:48:49 -0700131 upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ
132 | UPF_FIXED_PORT;
Zang Roy-r61911be9633e2006-08-23 10:20:27 +0800133 struct device_node *tsi = of_get_parent(np);
Kumar Galab580d462005-12-20 16:16:52 -0600134
135 /* We only support ports that have a clock frequency properly
136 * encoded in the device-tree.
137 */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000138 if (of_get_property(np, "clock-frequency", NULL) == NULL)
Kumar Galab580d462005-12-20 16:16:52 -0600139 return -1;
140
John Linn1e6d1f22008-07-01 10:52:41 -0700141 /* if reg-shift or offset, don't try to use it */
142 if ((of_get_property(np, "reg-shift", NULL) != NULL) ||
143 (of_get_property(np, "reg-offset", NULL) != NULL))
144 return -1;
145
Arnd Bergmann8d38a5b2007-02-13 21:35:38 +0100146 /* if rtas uses this device, don't try to use it as well */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000147 if (of_get_property(np, "used-by-rtas", NULL) != NULL)
Arnd Bergmann8d38a5b2007-02-13 21:35:38 +0100148 return -1;
149
Kumar Galab580d462005-12-20 16:16:52 -0600150 /* Get the address */
151 addrp = of_get_address(soc_dev, 0, NULL, NULL);
152 if (addrp == NULL)
153 return -1;
154
155 addr = of_translate_address(soc_dev, addrp);
Benjamin Herrenschmidt7c6efda2006-07-03 17:24:15 +1000156 if (addr == OF_BAD_ADDR)
157 return -1;
Kumar Galab580d462005-12-20 16:16:52 -0600158
159 /* Add port, irq will be dealt with later. We passed a translated
160 * IO port value. It will be fixed up later along with the irq
161 */
Zang Roy-r61911be9633e2006-08-23 10:20:27 +0800162 if (tsi && !strcmp(tsi->type, "tsi-bridge"))
163 return add_legacy_port(np, -1, UPIO_TSI, addr, addr, NO_IRQ, flags, 0);
164 else
165 return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0);
Kumar Galab580d462005-12-20 16:16:52 -0600166}
167
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100168static int __init add_legacy_isa_port(struct device_node *np,
Kumar Gala017e0fa2006-01-03 16:15:21 -0600169 struct device_node *isa_brg)
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100170{
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000171 const u32 *reg;
172 const char *typep;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100173 int index = -1;
Benjamin Herrenschmidtf704b8d2006-07-04 14:14:07 +1000174 u64 taddr;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100175
Benjamin Herrenschmidt7c6efda2006-07-03 17:24:15 +1000176 DBG(" -> add_legacy_isa_port(%s)\n", np->full_name);
177
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100178 /* Get the ISA port number */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000179 reg = of_get_property(np, "reg", NULL);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100180 if (reg == NULL)
181 return -1;
182
183 /* Verify it's an IO port, we don't support anything else */
184 if (!(reg[0] & 0x00000001))
185 return -1;
186
187 /* Now look for an "ibm,aix-loc" property that gives us ordering
188 * if any...
189 */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000190 typep = of_get_property(np, "ibm,aix-loc", NULL);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100191
192 /* If we have a location index, then use it */
193 if (typep && *typep == 'S')
194 index = simple_strtol(typep+1, NULL, 0) - 1;
195
Benjamin Herrenschmidtf704b8d2006-07-04 14:14:07 +1000196 /* Translate ISA address. If it fails, we still register the port
197 * with no translated address so that it can be picked up as an IO
198 * port later by the serial driver
199 */
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100200 taddr = of_translate_address(np, reg);
Benjamin Herrenschmidt7c6efda2006-07-03 17:24:15 +1000201 if (taddr == OF_BAD_ADDR)
Benjamin Herrenschmidtf704b8d2006-07-04 14:14:07 +1000202 taddr = 0;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100203
204 /* Add port, irq will be dealt with later */
Benjamin Herrenschmidt7c6efda2006-07-03 17:24:15 +1000205 return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr,
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000206 NO_IRQ, UPF_BOOT_AUTOCONF, 0);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100207
208}
209
Kumar Gala017e0fa2006-01-03 16:15:21 -0600210#ifdef CONFIG_PCI
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100211static int __init add_legacy_pci_port(struct device_node *np,
212 struct device_node *pci_dev)
213{
Benjamin Herrenschmidtf704b8d2006-07-04 14:14:07 +1000214 u64 addr, base;
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000215 const u32 *addrp;
Benjamin Herrenschmidtd2dd4822005-11-30 16:57:28 +1100216 unsigned int flags;
Benjamin Herrenschmidt8dacaed2005-11-29 11:21:59 +1100217 int iotype, index = -1, lindex = 0;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100218
Benjamin Herrenschmidt7c6efda2006-07-03 17:24:15 +1000219 DBG(" -> add_legacy_pci_port(%s)\n", np->full_name);
220
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100221 /* We only support ports that have a clock frequency properly
222 * encoded in the device-tree (that is have an fcode). Anything
223 * else can't be used that early and will be normally probed by
Benjamin Herrenschmidt8dacaed2005-11-29 11:21:59 +1100224 * the generic 8250_pci driver later on. The reason is that 8250
225 * compatible UARTs on PCI need all sort of quirks (port offsets
226 * etc...) that this code doesn't know about
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100227 */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000228 if (of_get_property(np, "clock-frequency", NULL) == NULL)
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100229 return -1;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100230
231 /* Get the PCI address. Assume BAR 0 */
Benjamin Herrenschmidtd2dd4822005-11-30 16:57:28 +1100232 addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100233 if (addrp == NULL)
234 return -1;
235
236 /* We only support BAR 0 for now */
Benjamin Herrenschmidtd2dd4822005-11-30 16:57:28 +1100237 iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100238 addr = of_translate_address(pci_dev, addrp);
Benjamin Herrenschmidt7c6efda2006-07-03 17:24:15 +1000239 if (addr == OF_BAD_ADDR)
240 return -1;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100241
242 /* Set the IO base to the same as the translated address for MMIO,
243 * or to the domain local IO base for PIO (it will be fixed up later)
244 */
245 if (iotype == UPIO_MEM)
246 base = addr;
247 else
248 base = addrp[2];
249
250 /* Try to guess an index... If we have subdevices of the pci dev,
251 * we get to their "reg" property
252 */
253 if (np != pci_dev) {
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000254 const u32 *reg = of_get_property(np, "reg", NULL);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100255 if (reg && (*reg < 4))
Benjamin Herrenschmidt8dacaed2005-11-29 11:21:59 +1100256 index = lindex = *reg;
257 }
258
259 /* Local index means it's the Nth port in the PCI chip. Unfortunately
260 * the offset to add here is device specific. We know about those
261 * EXAR ports and we default to the most common case. If your UART
262 * doesn't work for these settings, you'll have to add your own special
263 * cases here
264 */
Stephen Rothwell55b61fe2007-05-03 17:26:52 +1000265 if (of_device_is_compatible(pci_dev, "pci13a8,152") ||
266 of_device_is_compatible(pci_dev, "pci13a8,154") ||
267 of_device_is_compatible(pci_dev, "pci13a8,158")) {
Benjamin Herrenschmidt8dacaed2005-11-29 11:21:59 +1100268 addr += 0x200 * lindex;
269 base += 0x200 * lindex;
270 } else {
271 addr += 8 * lindex;
272 base += 8 * lindex;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100273 }
274
275 /* Add port, irq will be dealt with later. We passed a translated
276 * IO port value. It will be fixed up later along with the irq
277 */
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000278 return add_legacy_port(np, index, iotype, base, addr, NO_IRQ,
279 UPF_BOOT_AUTOCONF, np != pci_dev);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100280}
Kumar Gala017e0fa2006-01-03 16:15:21 -0600281#endif
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100282
Michael Neuling37a801c2006-03-26 10:07:35 +1000283static void __init setup_legacy_serial_console(int console)
284{
285 struct legacy_serial_info *info =
286 &legacy_serial_infos[console];
287 void __iomem *addr;
288
289 if (info->taddr == 0)
290 return;
291 addr = ioremap(info->taddr, 0x1000);
292 if (addr == NULL)
293 return;
294 if (info->speed == 0)
295 info->speed = udbg_probe_uart_speed(addr, info->clock);
296 DBG("default console speed = %d\n", info->speed);
297 udbg_init_uart(addr, info->speed, info->clock);
298}
299
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100300/*
301 * This is called very early, as part of setup_system() or eventually
302 * setup_arch(), basically before anything else in this file. This function
303 * will try to build a list of all the available 8250-compatible serial ports
304 * in the machine using the Open Firmware device-tree. It currently only deals
305 * with ISA and PCI busses but could be extended. It allows a very early boot
306 * console to be initialized, that list is also used later to provide 8250 with
307 * the machine non-PCI ports and to properly pick the default console port
308 */
309void __init find_legacy_serial_ports(void)
310{
Kumar Galab580d462005-12-20 16:16:52 -0600311 struct device_node *np, *stdout = NULL;
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000312 const char *path;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100313 int index;
314
315 DBG(" -> find_legacy_serial_port()\n");
316
317 /* Now find out if one of these is out firmware console */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000318 path = of_get_property(of_chosen, "linux,stdout-path", NULL);
Kumar Galab580d462005-12-20 16:16:52 -0600319 if (path != NULL) {
320 stdout = of_find_node_by_path(path);
321 if (stdout)
322 DBG("stdout is %s\n", stdout->full_name);
323 } else {
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100324 DBG(" no linux,stdout-path !\n");
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100325 }
Kumar Galab580d462005-12-20 16:16:52 -0600326
Paul Gortmaker1a7507c2008-01-24 11:59:12 -0500327 /* Iterate over all the 16550 ports, looking for known parents */
Cyrill Gorcunov3329c0d2007-11-30 06:45:47 +1100328 for_each_compatible_node(np, "serial", "ns16550") {
Paul Gortmaker1a7507c2008-01-24 11:59:12 -0500329 struct device_node *parent = of_get_parent(np);
330 if (!parent)
331 continue;
Benjamin Herrenschmidt3bc5ab92008-07-07 16:39:50 +1000332 if (of_match_node(legacy_serial_parents, parent) != NULL) {
Kumar Galab580d462005-12-20 16:16:52 -0600333 index = add_legacy_soc_port(np, np);
334 if (index >= 0 && np == stdout)
335 legacy_serial_console = index;
336 }
Paul Gortmaker1a7507c2008-01-24 11:59:12 -0500337 of_node_put(parent);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100338 }
339
Paul Gortmaker1a7507c2008-01-24 11:59:12 -0500340 /* Next, fill our array with ISA ports */
Cyrill Gorcunov3329c0d2007-11-30 06:45:47 +1100341 for_each_node_by_type(np, "serial") {
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100342 struct device_node *isa = of_get_parent(np);
343 if (isa && !strcmp(isa->name, "isa")) {
344 index = add_legacy_isa_port(np, isa);
345 if (index >= 0 && np == stdout)
346 legacy_serial_console = index;
347 }
348 of_node_put(isa);
349 }
350
Kumar Gala017e0fa2006-01-03 16:15:21 -0600351#ifdef CONFIG_PCI
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100352 /* Next, try to locate PCI ports */
353 for (np = NULL; (np = of_find_all_nodes(np));) {
354 struct device_node *pci, *parent = of_get_parent(np);
355 if (parent && !strcmp(parent->name, "isa")) {
356 of_node_put(parent);
357 continue;
358 }
359 if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) {
360 of_node_put(parent);
361 continue;
362 }
363 /* Check for known pciclass, and also check wether we have
364 * a device with child nodes for ports or not
365 */
Stephen Rothwell55b61fe2007-05-03 17:26:52 +1000366 if (of_device_is_compatible(np, "pciclass,0700") ||
367 of_device_is_compatible(np, "pciclass,070002"))
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100368 pci = np;
Stephen Rothwell55b61fe2007-05-03 17:26:52 +1000369 else if (of_device_is_compatible(parent, "pciclass,0700") ||
370 of_device_is_compatible(parent, "pciclass,070002"))
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100371 pci = parent;
372 else {
373 of_node_put(parent);
374 continue;
375 }
376 index = add_legacy_pci_port(np, pci);
377 if (index >= 0 && np == stdout)
378 legacy_serial_console = index;
379 of_node_put(parent);
380 }
Kumar Gala017e0fa2006-01-03 16:15:21 -0600381#endif
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100382
383 DBG("legacy_serial_console = %d\n", legacy_serial_console);
Michael Neuling37a801c2006-03-26 10:07:35 +1000384 if (legacy_serial_console >= 0)
385 setup_legacy_serial_console(legacy_serial_console);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100386 DBG(" <- find_legacy_serial_port()\n");
387}
388
389static struct platform_device serial_device = {
390 .name = "serial8250",
391 .id = PLAT8250_DEV_PLATFORM,
392 .dev = {
393 .platform_data = legacy_serial_ports,
394 },
395};
396
397static void __init fixup_port_irq(int index,
398 struct device_node *np,
399 struct plat_serial8250_port *port)
400{
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000401 unsigned int virq;
402
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100403 DBG("fixup_port_irq(%d)\n", index);
404
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000405 virq = irq_of_parse_and_map(np, 0);
406 if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) {
407 np = of_get_parent(np);
408 if (np == NULL)
409 return;
410 virq = irq_of_parse_and_map(np, 0);
411 of_node_put(np);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100412 }
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000413 if (virq == NO_IRQ)
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100414 return;
415
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000416 port->irq = virq;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100417}
418
419static void __init fixup_port_pio(int index,
420 struct device_node *np,
421 struct plat_serial8250_port *port)
422{
Kumar Gala017e0fa2006-01-03 16:15:21 -0600423#ifdef CONFIG_PCI
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100424 struct pci_controller *hose;
425
426 DBG("fixup_port_pio(%d)\n", index);
427
428 hose = pci_find_hose_for_OF_device(np);
429 if (hose) {
430 unsigned long offset = (unsigned long)hose->io_base_virt -
431#ifdef CONFIG_PPC64
432 pci_io_base;
433#else
434 isa_io_base;
435#endif
436 DBG("port %d, IO %lx -> %lx\n",
437 index, port->iobase, port->iobase + offset);
438 port->iobase += offset;
439 }
Kumar Gala017e0fa2006-01-03 16:15:21 -0600440#endif
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100441}
442
Benjamin Herrenschmidt8dacaed2005-11-29 11:21:59 +1100443static void __init fixup_port_mmio(int index,
444 struct device_node *np,
445 struct plat_serial8250_port *port)
446{
447 DBG("fixup_port_mmio(%d)\n", index);
448
449 port->membase = ioremap(port->mapbase, 0x100);
450}
451
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100452/*
453 * This is called as an arch initcall, hopefully before the PCI bus is
454 * probed and/or the 8250 driver loaded since we need to register our
455 * platform devices before 8250 PCI ones are detected as some of them
456 * must properly "override" the platform ones.
457 *
458 * This function fixes up the interrupt value for platform ports as it
459 * couldn't be done earlier before interrupt maps have been parsed. It
460 * also "corrects" the IO address for PIO ports for the same reason,
461 * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
462 * registers all those platform ports for use by the 8250 driver when it
463 * finally loads.
464 */
465static int __init serial_dev_init(void)
466{
467 int i;
468
469 if (legacy_serial_count == 0)
470 return -ENODEV;
471
472 /*
Stefan Weil947af292010-01-07 00:03:52 +0100473 * Before we register the platform serial devices, we need
joe@perches.com00d70412007-12-18 06:30:12 +1100474 * to fixup their interrupts and their IO ports.
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100475 */
476 DBG("Fixing serial ports interrupts and IO ports ...\n");
477
478 for (i = 0; i < legacy_serial_count; i++) {
479 struct plat_serial8250_port *port = &legacy_serial_ports[i];
480 struct device_node *np = legacy_serial_infos[i].np;
481
482 if (port->irq == NO_IRQ)
483 fixup_port_irq(i, np, port);
484 if (port->iotype == UPIO_PORT)
485 fixup_port_pio(i, np, port);
Zang Roy-r61911be9633e2006-08-23 10:20:27 +0800486 if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI))
Benjamin Herrenschmidt8dacaed2005-11-29 11:21:59 +1100487 fixup_port_mmio(i, np, port);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100488 }
489
490 DBG("Registering platform serial ports\n");
491
492 return platform_device_register(&serial_device);
493}
Olof Johanssonee56c472007-08-22 19:26:37 -0500494device_initcall(serial_dev_init);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100495
496
Benjamin Herrenschmidt025d7912008-07-28 13:49:15 +1000497#ifdef CONFIG_SERIAL_8250_CONSOLE
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100498/*
499 * This is called very early, as part of console_init() (typically just after
500 * time_init()). This function is respondible for trying to find a good
501 * default console on serial ports. It tries to match the open firmware
Benjamin Herrenschmidt025d7912008-07-28 13:49:15 +1000502 * default output with one of the available serial console drivers that have
503 * been probed earlier by find_legacy_serial_ports()
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100504 */
505static int __init check_legacy_serial_console(void)
506{
507 struct device_node *prom_stdout = NULL;
Benjamin Herrenschmidt025d7912008-07-28 13:49:15 +1000508 int i, speed = 0, offset = 0;
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000509 const char *name;
510 const u32 *spd;
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100511
512 DBG(" -> check_legacy_serial_console()\n");
513
514 /* The user has requested a console so this is already set up. */
Alon Bar-Levb8757b22007-02-12 00:54:17 -0800515 if (strstr(boot_command_line, "console=")) {
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100516 DBG(" console was specified !\n");
517 return -EBUSY;
518 }
519
520 if (!of_chosen) {
521 DBG(" of_chosen is NULL !\n");
522 return -ENODEV;
523 }
Kumar Galab580d462005-12-20 16:16:52 -0600524
525 if (legacy_serial_console < 0) {
526 DBG(" legacy_serial_console not found !\n");
527 return -ENODEV;
528 }
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100529 /* We are getting a weird phandle from OF ... */
530 /* ... So use the full path instead */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000531 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100532 if (name == NULL) {
533 DBG(" no linux,stdout-path !\n");
534 return -ENODEV;
535 }
536 prom_stdout = of_find_node_by_path(name);
537 if (!prom_stdout) {
538 DBG(" can't find stdout package %s !\n", name);
539 return -ENODEV;
540 }
541 DBG("stdout is %s\n", prom_stdout->full_name);
542
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000543 name = of_get_property(prom_stdout, "name", NULL);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100544 if (!name) {
545 DBG(" stdout package has no name !\n");
546 goto not_found;
547 }
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000548 spd = of_get_property(prom_stdout, "current-speed", NULL);
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100549 if (spd)
550 speed = *spd;
551
Benjamin Herrenschmidt025d7912008-07-28 13:49:15 +1000552 if (strcmp(name, "serial") != 0)
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100553 goto not_found;
Benjamin Herrenschmidt025d7912008-07-28 13:49:15 +1000554
555 /* Look for it in probed array */
556 for (i = 0; i < legacy_serial_count; i++) {
557 if (prom_stdout != legacy_serial_infos[i].np)
558 continue;
559 offset = i;
560 speed = legacy_serial_infos[i].speed;
561 break;
562 }
563 if (i >= legacy_serial_count)
564 goto not_found;
565
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100566 of_node_put(prom_stdout);
567
568 DBG("Found serial console at ttyS%d\n", offset);
569
570 if (speed) {
571 static char __initdata opt[16];
572 sprintf(opt, "%d", speed);
573 return add_preferred_console("ttyS", offset, opt);
574 } else
575 return add_preferred_console("ttyS", offset, NULL);
576
577 not_found:
578 DBG("No preferred console found !\n");
579 of_node_put(prom_stdout);
580 return -ENODEV;
581}
582console_initcall(check_legacy_serial_console);
583
Benjamin Herrenschmidt025d7912008-07-28 13:49:15 +1000584#endif /* CONFIG_SERIAL_8250_CONSOLE */