1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/types.h>
3 #include <linux/init.h>
4 #include <linux/delay.h>
5 #include <linux/kernel.h>
6 #include <linux/interrupt.h>
7 #include <linux/spinlock.h>
8 #include <linux/of_irq.h>
10 #include <asm/pmac_feature.h>
11 #include <asm/pmac_pfunc.h>
15 #define DBG(fmt...) printk(fmt)
20 static irqreturn_t macio_gpio_irq(int irq, void *data)
27 static int macio_do_gpio_irq_enable(struct pmf_function *func)
29 unsigned int irq = irq_of_parse_and_map(func->node, 0);
32 return request_irq(irq, macio_gpio_irq, 0, func->node->name, func);
35 static int macio_do_gpio_irq_disable(struct pmf_function *func)
37 unsigned int irq = irq_of_parse_and_map(func->node, 0);
44 static int macio_do_gpio_write(PMF_STD_ARGS, u8 value, u8 mask)
46 u8 __iomem *addr = (u8 __iomem *)func->driver_data;
51 if (args && args->count && !args->u[0].v)
55 raw_spin_lock_irqsave(&feature_lock, flags);
57 tmp = (tmp & ~mask) | (value & mask);
58 DBG("Do write 0x%02x to GPIO %pOF (%p)\n",
59 tmp, func->node, addr);
61 raw_spin_unlock_irqrestore(&feature_lock, flags);
66 static int macio_do_gpio_read(PMF_STD_ARGS, u8 mask, int rshift, u8 xor)
68 u8 __iomem *addr = (u8 __iomem *)func->driver_data;
71 /* Check if we have room for reply */
72 if (args == NULL || args->count == 0 || args->u[0].p == NULL)
76 *args->u[0].p = ((value & mask) >> rshift) ^ xor;
81 static int macio_do_delay(PMF_STD_ARGS, u32 duration)
83 /* assume we can sleep ! */
84 msleep((duration + 999) / 1000);
88 static struct pmf_handlers macio_gpio_handlers = {
89 .irq_enable = macio_do_gpio_irq_enable,
90 .irq_disable = macio_do_gpio_irq_disable,
91 .write_gpio = macio_do_gpio_write,
92 .read_gpio = macio_do_gpio_read,
93 .delay = macio_do_delay,
96 static void __init macio_gpio_init_one(struct macio_chip *macio)
98 struct device_node *gparent, *gp;
101 * Find the "gpio" parent node
104 for_each_child_of_node(macio->of_node, gparent)
105 if (of_node_name_eq(gparent, "gpio"))
110 DBG("Installing GPIO functions for macio %pOF\n",
114 * Ok, got one, we dont need anything special to track them down, so
115 * we just create them all
117 for_each_child_of_node(gparent, gp) {
118 const u32 *reg = of_get_property(gp, "reg", NULL);
119 unsigned long offset;
123 /* Deal with old style device-tree. We can safely hard code the
124 * offset for now too even if it's a bit gross ...
128 offset += (unsigned long)macio->base;
129 pmf_register_driver(gp, &macio_gpio_handlers, (void *)offset);
132 DBG("Calling initial GPIO functions for macio %pOF\n",
135 /* And now we run all the init ones */
136 for_each_child_of_node(gparent, gp)
137 pmf_do_functions(gp, NULL, 0, PMF_FLAGS_ON_INIT, NULL);
139 of_node_put(gparent);
141 /* Note: We do not at this point implement the "at sleep" or "at wake"
142 * functions. I yet to find any for GPIOs anyway
146 static int macio_do_write_reg32(PMF_STD_ARGS, u32 offset, u32 value, u32 mask)
148 struct macio_chip *macio = func->driver_data;
151 raw_spin_lock_irqsave(&feature_lock, flags);
152 MACIO_OUT32(offset, (MACIO_IN32(offset) & ~mask) | (value & mask));
153 raw_spin_unlock_irqrestore(&feature_lock, flags);
157 static int macio_do_read_reg32(PMF_STD_ARGS, u32 offset)
159 struct macio_chip *macio = func->driver_data;
161 /* Check if we have room for reply */
162 if (args == NULL || args->count == 0 || args->u[0].p == NULL)
165 *args->u[0].p = MACIO_IN32(offset);
169 static int macio_do_write_reg8(PMF_STD_ARGS, u32 offset, u8 value, u8 mask)
171 struct macio_chip *macio = func->driver_data;
174 raw_spin_lock_irqsave(&feature_lock, flags);
175 MACIO_OUT8(offset, (MACIO_IN8(offset) & ~mask) | (value & mask));
176 raw_spin_unlock_irqrestore(&feature_lock, flags);
180 static int macio_do_read_reg8(PMF_STD_ARGS, u32 offset)
182 struct macio_chip *macio = func->driver_data;
184 /* Check if we have room for reply */
185 if (args == NULL || args->count == 0 || args->u[0].p == NULL)
188 *((u8 *)(args->u[0].p)) = MACIO_IN8(offset);
192 static int macio_do_read_reg32_msrx(PMF_STD_ARGS, u32 offset, u32 mask,
195 struct macio_chip *macio = func->driver_data;
197 /* Check if we have room for reply */
198 if (args == NULL || args->count == 0 || args->u[0].p == NULL)
201 *args->u[0].p = ((MACIO_IN32(offset) & mask) >> shift) ^ xor;
205 static int macio_do_read_reg8_msrx(PMF_STD_ARGS, u32 offset, u32 mask,
208 struct macio_chip *macio = func->driver_data;
210 /* Check if we have room for reply */
211 if (args == NULL || args->count == 0 || args->u[0].p == NULL)
214 *((u8 *)(args->u[0].p)) = ((MACIO_IN8(offset) & mask) >> shift) ^ xor;
218 static int macio_do_write_reg32_slm(PMF_STD_ARGS, u32 offset, u32 shift,
221 struct macio_chip *macio = func->driver_data;
226 if (args == NULL || args->count == 0)
229 raw_spin_lock_irqsave(&feature_lock, flags);
230 tmp = MACIO_IN32(offset);
231 val = args->u[0].v << shift;
232 tmp = (tmp & ~mask) | (val & mask);
233 MACIO_OUT32(offset, tmp);
234 raw_spin_unlock_irqrestore(&feature_lock, flags);
238 static int macio_do_write_reg8_slm(PMF_STD_ARGS, u32 offset, u32 shift,
241 struct macio_chip *macio = func->driver_data;
246 if (args == NULL || args->count == 0)
249 raw_spin_lock_irqsave(&feature_lock, flags);
250 tmp = MACIO_IN8(offset);
251 val = args->u[0].v << shift;
252 tmp = (tmp & ~mask) | (val & mask);
253 MACIO_OUT8(offset, tmp);
254 raw_spin_unlock_irqrestore(&feature_lock, flags);
258 static struct pmf_handlers macio_mmio_handlers = {
259 .write_reg32 = macio_do_write_reg32,
260 .read_reg32 = macio_do_read_reg32,
261 .write_reg8 = macio_do_write_reg8,
262 .read_reg8 = macio_do_read_reg8,
263 .read_reg32_msrx = macio_do_read_reg32_msrx,
264 .read_reg8_msrx = macio_do_read_reg8_msrx,
265 .write_reg32_slm = macio_do_write_reg32_slm,
266 .write_reg8_slm = macio_do_write_reg8_slm,
267 .delay = macio_do_delay,
270 static void __init macio_mmio_init_one(struct macio_chip *macio)
272 DBG("Installing MMIO functions for macio %pOF\n",
275 pmf_register_driver(macio->of_node, &macio_mmio_handlers, macio);
278 static struct device_node *unin_hwclock;
280 static int unin_do_write_reg32(PMF_STD_ARGS, u32 offset, u32 value, u32 mask)
284 raw_spin_lock_irqsave(&feature_lock, flags);
285 /* This is fairly bogus in darwin, but it should work for our needs
286 * implemeted that way:
288 UN_OUT(offset, (UN_IN(offset) & ~mask) | (value & mask));
289 raw_spin_unlock_irqrestore(&feature_lock, flags);
294 static struct pmf_handlers unin_mmio_handlers = {
295 .write_reg32 = unin_do_write_reg32,
296 .delay = macio_do_delay,
299 static void __init uninorth_install_pfunc(void)
301 struct device_node *np;
303 DBG("Installing functions for UniN %pOF\n",
307 * Install handlers for the bridge itself
309 pmf_register_driver(uninorth_node, &unin_mmio_handlers, NULL);
310 pmf_do_functions(uninorth_node, NULL, 0, PMF_FLAGS_ON_INIT, NULL);
314 * Install handlers for the hwclock child if any
316 for_each_child_of_node(uninorth_node, np)
317 if (of_node_name_eq(np, "hw-clock")) {
322 DBG("Installing functions for UniN clock %pOF\n",
324 pmf_register_driver(unin_hwclock, &unin_mmio_handlers, NULL);
325 pmf_do_functions(unin_hwclock, NULL, 0, PMF_FLAGS_ON_INIT,
330 /* We export this as the SMP code might init us early */
331 int __init pmac_pfunc_base_install(void)
333 static int pfbase_inited;
340 if (!machine_is(powermac))
343 DBG("Installing base platform functions...\n");
346 * Locate mac-io chips and install handlers
348 for (i = 0 ; i < MAX_MACIO_CHIPS; i++) {
349 if (macio_chips[i].of_node) {
350 macio_mmio_init_one(&macio_chips[i]);
351 macio_gpio_init_one(&macio_chips[i]);
356 * Install handlers for northbridge and direct mapped hwclock
357 * if any. We do not implement the config space access callback
358 * which is only ever used for functions that we do not call in
359 * the current driver (enabling/disabling cells in U2, mostly used
360 * to restore the PCI settings, we do that differently)
362 if (uninorth_node && uninorth_base)
363 uninorth_install_pfunc();
365 DBG("All base functions installed\n");
369 machine_arch_initcall(powermac, pmac_pfunc_base_install);
373 /* Those can be called by pmac_feature. Ultimately, I should use a sysdev
374 * or a device, but for now, that's good enough until I sort out some
375 * ordering issues. Also, we do not bother with GPIOs, as so far I yet have
376 * to see a case where a GPIO function has the on-suspend or on-resume bit
378 void pmac_pfunc_base_suspend(void)
382 for (i = 0 ; i < MAX_MACIO_CHIPS; i++) {
383 if (macio_chips[i].of_node)
384 pmf_do_functions(macio_chips[i].of_node, NULL, 0,
385 PMF_FLAGS_ON_SLEEP, NULL);
388 pmf_do_functions(uninorth_node, NULL, 0,
389 PMF_FLAGS_ON_SLEEP, NULL);
391 pmf_do_functions(unin_hwclock, NULL, 0,
392 PMF_FLAGS_ON_SLEEP, NULL);
395 void pmac_pfunc_base_resume(void)
400 pmf_do_functions(unin_hwclock, NULL, 0,
401 PMF_FLAGS_ON_WAKE, NULL);
403 pmf_do_functions(uninorth_node, NULL, 0,
404 PMF_FLAGS_ON_WAKE, NULL);
405 for (i = 0 ; i < MAX_MACIO_CHIPS; i++) {
406 if (macio_chips[i].of_node)
407 pmf_do_functions(macio_chips[i].of_node, NULL, 0,
408 PMF_FLAGS_ON_WAKE, NULL);
412 #endif /* CONFIG_PM */