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On P9 there are GPIO port 0, 1, 2 for GPIO interrupt, and DIO interrupt is used to handle the interrupts. Add support to the DIO interrupts: 1. Add dio_interrupt_register(chip, port, callback) to register the interrupt; 2. Add dio_interrupt_deregister(chip, port, callback) to deregister; 3. When interrupt on the port occurs, callback is invoked, and the interrupt status is cleared. Signed-off-by: Lei YU <mine260309@gmail.com> [oliver: Fixed Makefile.inc merge conflict] Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
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/* Copyright 2019 IBM Corp. | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or | ||
* implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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#define pr_fmt(fmt) "DIO: " fmt | ||
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#include <chip.h> | ||
#include <dio-p9.h> | ||
#include <opal.h> | ||
#include <xscom.h> | ||
#include <xscom-p9-regs.h> | ||
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void p9_dio_init(void) | ||
{ | ||
struct dt_node *xn; | ||
struct proc_chip *chip; | ||
struct p9_dio *dio; | ||
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if (proc_gen < proc_gen_p9) | ||
return; | ||
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dt_for_each_compatible(dt_root, xn, "ibm,xscom") { | ||
dio = zalloc(sizeof(struct p9_dio)); | ||
assert(dio); | ||
chip = get_chip(dt_get_chip_id(xn)); | ||
assert(chip); | ||
chip->dio = dio; | ||
} | ||
} | ||
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int dio_interrupt_register(struct proc_chip *chip, | ||
int port, dio_interrupt_callback callback) | ||
{ | ||
u64 val; | ||
int rc; | ||
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assert(chip); | ||
assert(chip->dio); | ||
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if (port < 0 || port >= NUM_OF_P9_DIO_PORTS) | ||
return OPAL_PARAMETER; | ||
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if (chip->dio->callbacks[port]) /* This port already has a callback */ | ||
return OPAL_PARAMETER; | ||
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rc = xscom_read(chip->id, P9_GPIO_INTERRUPT_ENABLE, &val); | ||
if (rc != OPAL_SUCCESS) { | ||
prlog(PR_ERR, "XSCOM error %d reading reg 0x%llx\n", | ||
rc, P9_GPIO_INTERRUPT_ENABLE); | ||
return OPAL_HARDWARE; | ||
} | ||
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val |= PPC_BIT(port); | ||
rc = xscom_write(chip->id, P9_GPIO_INTERRUPT_ENABLE, val); | ||
if (rc != OPAL_SUCCESS) { | ||
prlog(PR_ERR, "XSCOM error %d writing reg 0x%llx\n", | ||
rc, P9_GPIO_INTERRUPT_ENABLE); | ||
return OPAL_HARDWARE; | ||
} | ||
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chip->dio->callbacks[port] = callback; | ||
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return OPAL_SUCCESS; | ||
} | ||
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int dio_interrupt_deregister(struct proc_chip* chip, | ||
int port, dio_interrupt_callback callback) | ||
{ | ||
u64 val; | ||
int rc; | ||
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assert(chip); | ||
assert(chip->dio); | ||
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if (port < 0 || port >= NUM_OF_P9_DIO_PORTS) | ||
return OPAL_PARAMETER; | ||
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if (chip->dio->callbacks[port] != callback) | ||
return OPAL_PARAMETER; | ||
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rc = xscom_read(chip->id, P9_GPIO_INTERRUPT_ENABLE, &val); | ||
if (rc != OPAL_SUCCESS) { | ||
prlog(PR_ERR, "XSCOM error %d reading reg 0x%llx\n", | ||
rc, P9_GPIO_INTERRUPT_ENABLE); | ||
return OPAL_HARDWARE; | ||
} | ||
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val &= ~PPC_BIT(port); | ||
rc = xscom_write(chip->id, P9_GPIO_INTERRUPT_ENABLE, val); | ||
if (rc != OPAL_SUCCESS) { | ||
prlog(PR_ERR, "XSCOM error %d writing reg 0x%llx\n", | ||
rc, P9_GPIO_INTERRUPT_ENABLE); | ||
return OPAL_HARDWARE; | ||
} | ||
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chip->dio->callbacks[port] = NULL; | ||
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return OPAL_SUCCESS; | ||
} | ||
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void dio_interrupt_handler(uint32_t chip_id) | ||
{ | ||
struct proc_chip *chip; | ||
u64 val; | ||
int rc; | ||
int i; | ||
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chip = get_chip(chip_id); | ||
if (chip == NULL || chip->dio == NULL) | ||
return; | ||
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rc = xscom_read(chip->id, P9_GPIO_INTERRUPT_STATUS, &val); | ||
if (rc != OPAL_SUCCESS) { | ||
prlog(PR_ERR, "XSCOM error %d reading reg 0x%llx\n", | ||
rc, P9_GPIO_INTERRUPT_STATUS); | ||
return; | ||
} | ||
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for (i = 0; i < NUM_OF_P9_DIO_PORTS; ++i) { | ||
if (val & PPC_BIT(i)) { | ||
if (chip->dio->callbacks[i]) | ||
chip->dio->callbacks[i](chip); | ||
else | ||
prlog(PR_ERR, | ||
"DIO interrupt triggerd on chip 0x%x" | ||
" port %d but no handler\n", | ||
chip->id, i); | ||
/* Write 1 to clear the interrupt status */ | ||
xscom_write(chip->id, P9_GPIO_INTERRUPT_CONDITION, | ||
val & PPC_BIT(i)); | ||
} | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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/* Copyright 2019 IBM Corp. | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or | ||
* implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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#ifndef __DIO_H | ||
#define __DIO_H | ||
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struct proc_chip; | ||
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/* Initialize the P9 DIO */ | ||
extern void p9_dio_init(void); | ||
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/* The function typedef for dio interrupt callback */ | ||
typedef void (*dio_interrupt_callback)(struct proc_chip *chip); | ||
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/* Register dio interrupt on GPIO port. | ||
* This effectively enables the DIO interrupt on the GPIO port, | ||
* and callback will be called when the interrupt is triggered */ | ||
extern int dio_interrupt_register(struct proc_chip *chip, | ||
int port, dio_interrupt_callback c); | ||
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/* Deregister dio interrupt on GPIO port. | ||
* This effectively disables the DIO interrupt on the GPIO port. */ | ||
extern int dio_interrupt_deregister(struct proc_chip *chip, | ||
int port, dio_interrupt_callback c); | ||
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/* The function to be called when DIO interrupt is triggered */ | ||
extern void dio_interrupt_handler(uint32_t chip_id); | ||
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#define NUM_OF_P9_DIO_PORTS 3 /* P9 has GPIO port 0~2 for interrupts */ | ||
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struct p9_dio { | ||
dio_interrupt_callback callbacks[NUM_OF_P9_DIO_PORTS]; | ||
}; | ||
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#endif /* __DIO_H */ |
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