^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (c) 2015-2016, IBM Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/bt-bmc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mfd/syscon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * This is a BMC device used to communicate to the host
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define DEVICE_NAME "ipmi-bt-host"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define BT_IO_BASE 0xe4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define BT_IRQ 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define BT_CR0 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define BT_CR0_IO_BASE 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define BT_CR0_IRQ 12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define BT_CR0_EN_CLR_SLV_RDP 0x8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define BT_CR0_EN_CLR_SLV_WRP 0x4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define BT_CR0_ENABLE_IBT 0x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define BT_CR1 0x4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define BT_CR1_IRQ_H2B 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define BT_CR1_IRQ_HBUSY 0x40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define BT_CR2 0x8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define BT_CR2_IRQ_H2B 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define BT_CR2_IRQ_HBUSY 0x40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define BT_CR3 0xc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define BT_CTRL 0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define BT_CTRL_B_BUSY 0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define BT_CTRL_H_BUSY 0x40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #define BT_CTRL_OEM0 0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define BT_CTRL_SMS_ATN 0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define BT_CTRL_B2H_ATN 0x08
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define BT_CTRL_H2B_ATN 0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #define BT_CTRL_CLR_RD_PTR 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #define BT_CTRL_CLR_WR_PTR 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #define BT_BMC2HOST 0x14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define BT_INTMASK 0x18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #define BT_INTMASK_B2H_IRQEN 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #define BT_INTMASK_B2H_IRQ 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #define BT_INTMASK_BMC_HWRST 0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #define BT_BMC_BUFFER_SIZE 256
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct bt_bmc {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct device dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct miscdevice miscdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct regmap *map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) wait_queue_head_t queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct timer_list poll_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct mutex mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static atomic_t open_count = ATOMIC_INIT(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static const struct regmap_config bt_regmap_cfg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) .reg_bits = 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) .val_bits = 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .reg_stride = 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static u8 bt_inb(struct bt_bmc *bt_bmc, int reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) uint32_t val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) rc = regmap_read(bt_bmc->map, bt_bmc->offset + reg, &val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) WARN(rc != 0, "regmap_read() failed: %d\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return rc == 0 ? (u8) val : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static void bt_outb(struct bt_bmc *bt_bmc, u8 data, int reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) rc = regmap_write(bt_bmc->map, bt_bmc->offset + reg, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) WARN(rc != 0, "regmap_write() failed: %d\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static void clr_rd_ptr(struct bt_bmc *bt_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) bt_outb(bt_bmc, BT_CTRL_CLR_RD_PTR, BT_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static void clr_wr_ptr(struct bt_bmc *bt_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) bt_outb(bt_bmc, BT_CTRL_CLR_WR_PTR, BT_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static void clr_h2b_atn(struct bt_bmc *bt_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) bt_outb(bt_bmc, BT_CTRL_H2B_ATN, BT_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static void set_b_busy(struct bt_bmc *bt_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (!(bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_B_BUSY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) bt_outb(bt_bmc, BT_CTRL_B_BUSY, BT_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static void clr_b_busy(struct bt_bmc *bt_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_B_BUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) bt_outb(bt_bmc, BT_CTRL_B_BUSY, BT_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static void set_b2h_atn(struct bt_bmc *bt_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) bt_outb(bt_bmc, BT_CTRL_B2H_ATN, BT_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static u8 bt_read(struct bt_bmc *bt_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return bt_inb(bt_bmc, BT_BMC2HOST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static ssize_t bt_readn(struct bt_bmc *bt_bmc, u8 *buf, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) for (i = 0; i < n; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) buf[i] = bt_read(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static void bt_write(struct bt_bmc *bt_bmc, u8 c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) bt_outb(bt_bmc, c, BT_BMC2HOST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) static ssize_t bt_writen(struct bt_bmc *bt_bmc, u8 *buf, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) for (i = 0; i < n; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) bt_write(bt_bmc, buf[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static void set_sms_atn(struct bt_bmc *bt_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) bt_outb(bt_bmc, BT_CTRL_SMS_ATN, BT_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static struct bt_bmc *file_bt_bmc(struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return container_of(file->private_data, struct bt_bmc, miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int bt_bmc_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct bt_bmc *bt_bmc = file_bt_bmc(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (atomic_inc_return(&open_count) == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) clr_b_busy(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) atomic_dec(&open_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * The BT (Block Transfer) interface means that entire messages are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * buffered by the host before a notification is sent to the BMC that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * there is data to be read. The first byte is the length and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * message data follows. The read operation just tries to capture the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * whole before returning it to userspace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * BT Message format :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * Byte 1 Byte 2 Byte 3 Byte 4 Byte 5:N
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * Length NetFn/LUN Seq Cmd Data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static ssize_t bt_bmc_read(struct file *file, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct bt_bmc *bt_bmc = file_bt_bmc(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) u8 len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) int len_byte = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) u8 kbuffer[BT_BMC_BUFFER_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) ssize_t nread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) WARN_ON(*ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (wait_event_interruptible(bt_bmc->queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_H2B_ATN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) mutex_lock(&bt_bmc->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (unlikely(!(bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_H2B_ATN))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) set_b_busy(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) clr_h2b_atn(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) clr_rd_ptr(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) * The BT frames start with the message length, which does not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * include the length byte.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) kbuffer[0] = bt_read(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) len = kbuffer[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /* We pass the length back to userspace as well */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (len + 1 > count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) len = count - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) while (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) nread = min_t(ssize_t, len, sizeof(kbuffer) - len_byte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) bt_readn(bt_bmc, kbuffer + len_byte, nread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (copy_to_user(buf, kbuffer, nread + len_byte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) len -= nread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) buf += nread + len_byte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) ret += nread + len_byte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) len_byte = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) clr_b_busy(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) mutex_unlock(&bt_bmc->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * BT Message response format :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6:N
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * Length NetFn/LUN Seq Cmd Code Data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static ssize_t bt_bmc_write(struct file *file, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) struct bt_bmc *bt_bmc = file_bt_bmc(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) u8 kbuffer[BT_BMC_BUFFER_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) ssize_t ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) ssize_t nwritten;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) * send a minimum response size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) if (count < 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) WARN_ON(*ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * There's no interrupt for clearing bmc busy so we have to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * poll
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (wait_event_interruptible(bt_bmc->queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) !(bt_inb(bt_bmc, BT_CTRL) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) (BT_CTRL_H_BUSY | BT_CTRL_B2H_ATN))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) return -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) mutex_lock(&bt_bmc->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (unlikely(bt_inb(bt_bmc, BT_CTRL) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) (BT_CTRL_H_BUSY | BT_CTRL_B2H_ATN))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) clr_wr_ptr(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) while (count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) nwritten = min_t(ssize_t, count, sizeof(kbuffer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) if (copy_from_user(&kbuffer, buf, nwritten)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) bt_writen(bt_bmc, kbuffer, nwritten);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) count -= nwritten;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) buf += nwritten;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) ret += nwritten;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) set_b2h_atn(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) mutex_unlock(&bt_bmc->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) static long bt_bmc_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) unsigned long param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) struct bt_bmc *bt_bmc = file_bt_bmc(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) case BT_BMC_IOCTL_SMS_ATN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) set_sms_atn(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static int bt_bmc_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) struct bt_bmc *bt_bmc = file_bt_bmc(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) atomic_dec(&open_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) set_b_busy(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static __poll_t bt_bmc_poll(struct file *file, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) struct bt_bmc *bt_bmc = file_bt_bmc(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) __poll_t mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) u8 ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) poll_wait(file, &bt_bmc->queue, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) ctrl = bt_inb(bt_bmc, BT_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (ctrl & BT_CTRL_H2B_ATN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) mask |= EPOLLIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) if (!(ctrl & (BT_CTRL_H_BUSY | BT_CTRL_B2H_ATN)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) mask |= EPOLLOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) return mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) static const struct file_operations bt_bmc_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) .open = bt_bmc_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) .read = bt_bmc_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) .write = bt_bmc_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) .release = bt_bmc_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) .poll = bt_bmc_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) .unlocked_ioctl = bt_bmc_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) static void poll_timer(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) struct bt_bmc *bt_bmc = from_timer(bt_bmc, t, poll_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) bt_bmc->poll_timer.expires += msecs_to_jiffies(500);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) wake_up(&bt_bmc->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) add_timer(&bt_bmc->poll_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) static irqreturn_t bt_bmc_irq(int irq, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) struct bt_bmc *bt_bmc = arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) u32 reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) rc = regmap_read(bt_bmc->map, bt_bmc->offset + BT_CR2, ®);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) reg &= BT_CR2_IRQ_H2B | BT_CR2_IRQ_HBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) if (!reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) /* ack pending IRQs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) regmap_write(bt_bmc->map, bt_bmc->offset + BT_CR2, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) wake_up(&bt_bmc->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) static int bt_bmc_config_irq(struct bt_bmc *bt_bmc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) bt_bmc->irq = platform_get_irq_optional(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (bt_bmc->irq < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return bt_bmc->irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) rc = devm_request_irq(dev, bt_bmc->irq, bt_bmc_irq, IRQF_SHARED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) DEVICE_NAME, bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (rc < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) dev_warn(dev, "Unable to request IRQ %d\n", bt_bmc->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) bt_bmc->irq = rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) * Configure IRQs on the bmc clearing the H2B and HBUSY bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) * H2B will be asserted when the bmc has data for us; HBUSY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * will be cleared (along with B2H) when we can write the next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * message to the BT buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) rc = regmap_update_bits(bt_bmc->map, bt_bmc->offset + BT_CR1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) (BT_CR1_IRQ_H2B | BT_CR1_IRQ_HBUSY),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) (BT_CR1_IRQ_H2B | BT_CR1_IRQ_HBUSY));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) static int bt_bmc_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) struct bt_bmc *bt_bmc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) dev_info(dev, "Found bt bmc device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) bt_bmc = devm_kzalloc(dev, sizeof(*bt_bmc), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (!bt_bmc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) dev_set_drvdata(&pdev->dev, bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) bt_bmc->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (IS_ERR(bt_bmc->map)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) * Assume it's not the MFD-based devicetree description, in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) * which case generate a regmap ourselves
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) base = devm_platform_ioremap_resource(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (IS_ERR(base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) return PTR_ERR(base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) bt_bmc->map = devm_regmap_init_mmio(dev, base, &bt_regmap_cfg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) bt_bmc->offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) rc = of_property_read_u32(dev->of_node, "reg", &bt_bmc->offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) mutex_init(&bt_bmc->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) init_waitqueue_head(&bt_bmc->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) bt_bmc->miscdev.minor = MISC_DYNAMIC_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) bt_bmc->miscdev.name = DEVICE_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) bt_bmc->miscdev.fops = &bt_bmc_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) bt_bmc->miscdev.parent = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) rc = misc_register(&bt_bmc->miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) dev_err(dev, "Unable to register misc device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) bt_bmc_config_irq(bt_bmc, pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (bt_bmc->irq >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) dev_info(dev, "Using IRQ %d\n", bt_bmc->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) dev_info(dev, "No IRQ; using timer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) timer_setup(&bt_bmc->poll_timer, poll_timer, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) bt_bmc->poll_timer.expires = jiffies + msecs_to_jiffies(10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) add_timer(&bt_bmc->poll_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) regmap_write(bt_bmc->map, bt_bmc->offset + BT_CR0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) (BT_IO_BASE << BT_CR0_IO_BASE) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) (BT_IRQ << BT_CR0_IRQ) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) BT_CR0_EN_CLR_SLV_RDP |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) BT_CR0_EN_CLR_SLV_WRP |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) BT_CR0_ENABLE_IBT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) clr_b_busy(bt_bmc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) static int bt_bmc_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) struct bt_bmc *bt_bmc = dev_get_drvdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) misc_deregister(&bt_bmc->miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) if (bt_bmc->irq < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) del_timer_sync(&bt_bmc->poll_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) static const struct of_device_id bt_bmc_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) { .compatible = "aspeed,ast2400-ibt-bmc" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) { .compatible = "aspeed,ast2500-ibt-bmc" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) static struct platform_driver bt_bmc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) .name = DEVICE_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) .of_match_table = bt_bmc_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) .probe = bt_bmc_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) .remove = bt_bmc_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) module_platform_driver(bt_bmc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) MODULE_DEVICE_TABLE(of, bt_bmc_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) MODULE_AUTHOR("Alistair Popple <alistair@popple.id.au>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) MODULE_DESCRIPTION("Linux device interface to the IPMI BT interface");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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