^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2014 Linaro Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Author: Ashwin Chaugule <ashwin.chaugule@linaro.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * PCC (Platform Communication Channel) is defined in the ACPI 5.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * specification. It is a mailbox like mechanism to allow clients
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * such as CPPC (Collaborative Processor Performance Control), RAS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * (Reliability, Availability and Serviceability) and MPST (Memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Node Power State Table) to talk to the platform (e.g. BMC) through
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * shared memory regions as defined in the PCC table entries. The PCC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * specification supports a Doorbell mechanism for the PCC clients
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * to notify the platform about new data. This Doorbell information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * is also specified in each PCC table entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Typical high level flow of operation is:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * PCC Reads:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * * Client tries to acquire a channel lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * * After it is acquired it writes READ cmd in communication region cmd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * * Client issues mbox_send_message() which rings the PCC doorbell
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * for its PCC channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * * If command completes, then client has control over channel and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * it can proceed with its reads.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * * Client releases lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * PCC Writes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * * Client tries to acquire channel lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * * Client writes to its communication region after it acquires a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * channel lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * * Client writes WRITE cmd in communication region cmd address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * * Client issues mbox_send_message() which rings the PCC doorbell
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * for its PCC channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * * If command completes, then writes have succeded and it can release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * the channel lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * There is a Nominal latency defined for each channel which indicates
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * how long to wait until a command completes. If command is not complete
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * the client needs to retry or assume failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * For more details about PCC, please see the ACPI specification from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * http://www.uefi.org/ACPIv5.1 Section 14.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * This file implements PCC as a Mailbox controller and allows for PCC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * clients to be implemented as its Mailbox Client Channels.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #include <linux/mailbox_controller.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #include <linux/mailbox_client.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #include <linux/io-64-nonatomic-lo-hi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #include <acpi/pcc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #include "mailbox.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #define MBOX_IRQ_NAME "pcc-mbox"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static struct mbox_chan *pcc_mbox_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* Array of cached virtual address for doorbell registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static void __iomem **pcc_doorbell_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /* Array of cached virtual address for doorbell ack registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static void __iomem **pcc_doorbell_ack_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* Array of doorbell interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static int *pcc_doorbell_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static struct mbox_controller pcc_mbox_ctrl = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * get_pcc_channel - Given a PCC subspace idx, get
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * the respective mbox_channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * @id: PCC subspace index.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * Return: ERR_PTR(errno) if error, else pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * to mbox channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static struct mbox_chan *get_pcc_channel(int id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (id < 0 || id >= pcc_mbox_ctrl.num_chans)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return &pcc_mbox_channels[id];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * PCC can be used with perf critical drivers such as CPPC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * So it makes sense to locally cache the virtual address and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * use it to read/write to PCC registers such as doorbell register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * The below read_register and write_registers are used to read and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * write from perf critical registers such as PCC doorbell register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static int read_register(void __iomem *vaddr, u64 *val, unsigned int bit_width)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) int ret_val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) switch (bit_width) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) case 8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) *val = readb(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) case 16:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) *val = readw(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) case 32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) *val = readl(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) case 64:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) *val = readq(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) pr_debug("Error: Cannot read register of %u bit width",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) bit_width);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) ret_val = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return ret_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static int write_register(void __iomem *vaddr, u64 val, unsigned int bit_width)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) int ret_val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) switch (bit_width) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) case 8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) writeb(val, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) case 16:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) writew(val, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) case 32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) writel(val, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) case 64:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) writeq(val, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) pr_debug("Error: Cannot write register of %u bit width",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) bit_width);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) ret_val = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return ret_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * pcc_map_interrupt - Map a PCC subspace GSI to a linux IRQ number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) * @interrupt: GSI number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * @flags: interrupt flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * Returns: a valid linux IRQ number on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * 0 or -EINVAL on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static int pcc_map_interrupt(u32 interrupt, u32 flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) int trigger, polarity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (!interrupt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) trigger = (flags & ACPI_PCCT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) : ACPI_LEVEL_SENSITIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) polarity = (flags & ACPI_PCCT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) : ACPI_ACTIVE_HIGH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return acpi_register_gsi(NULL, interrupt, trigger, polarity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^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) * pcc_mbox_irq - PCC mailbox interrupt handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static irqreturn_t pcc_mbox_irq(int irq, void *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct acpi_generic_address *doorbell_ack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct acpi_pcct_hw_reduced *pcct_ss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) struct mbox_chan *chan = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) u64 doorbell_ack_preserve;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) u64 doorbell_ack_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) u64 doorbell_ack_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) pcct_ss = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) mbox_chan_received_data(chan, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (pcct_ss->header.type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) struct acpi_pcct_hw_reduced_type2 *pcct2_ss = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) u32 id = chan - pcc_mbox_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) doorbell_ack = &pcct2_ss->platform_ack_register;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) doorbell_ack_preserve = pcct2_ss->ack_preserve_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) doorbell_ack_write = pcct2_ss->ack_write_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) ret = read_register(pcc_doorbell_ack_vaddr[id],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) &doorbell_ack_val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) doorbell_ack->bit_width);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) ret = write_register(pcc_doorbell_ack_vaddr[id],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) (doorbell_ack_val & doorbell_ack_preserve)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) | doorbell_ack_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) doorbell_ack->bit_width);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * pcc_mbox_request_channel - PCC clients call this function to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * request a pointer to their PCC subspace, from which they
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) * can get the details of communicating with the remote.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) * @cl: Pointer to Mailbox client, so we know where to bind the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * Channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) * @subspace_id: The PCC Subspace index as parsed in the PCC client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * ACPI package. This is used to lookup the array of PCC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * subspaces as parsed by the PCC Mailbox controller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * Return: Pointer to the Mailbox Channel if successful or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * ERR_PTR.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) int subspace_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) struct device *dev = pcc_mbox_ctrl.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) struct mbox_chan *chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * Each PCC Subspace is a Mailbox Channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) * The PCC Clients get their PCC Subspace ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) * from their own tables and pass it here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) * This returns a pointer to the PCC subspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * for the Client to operate on.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) chan = get_pcc_channel(subspace_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (IS_ERR(chan) || chan->cl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) dev_err(dev, "Channel not found for idx: %d\n", subspace_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return ERR_PTR(-EBUSY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) spin_lock_irqsave(&chan->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) chan->msg_free = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) chan->msg_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) chan->active_req = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) chan->cl = cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) init_completion(&chan->tx_complete);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (chan->txdone_method == TXDONE_BY_POLL && cl->knows_txdone)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) chan->txdone_method = TXDONE_BY_ACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) spin_unlock_irqrestore(&chan->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (pcc_doorbell_irq[subspace_id] > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) rc = devm_request_irq(dev, pcc_doorbell_irq[subspace_id],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) pcc_mbox_irq, 0, MBOX_IRQ_NAME, chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (unlikely(rc)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) dev_err(dev, "failed to register PCC interrupt %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) pcc_doorbell_irq[subspace_id]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) pcc_mbox_free_channel(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) chan = ERR_PTR(rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^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) return chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) EXPORT_SYMBOL_GPL(pcc_mbox_request_channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) * pcc_mbox_free_channel - Clients call this to free their Channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * @chan: Pointer to the mailbox channel as returned by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * pcc_mbox_request_channel()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) void pcc_mbox_free_channel(struct mbox_chan *chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) u32 id = chan - pcc_mbox_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (!chan || !chan->cl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) if (id >= pcc_mbox_ctrl.num_chans) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) pr_debug("pcc_mbox_free_channel: Invalid mbox_chan passed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (pcc_doorbell_irq[id] > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) devm_free_irq(chan->mbox->dev, pcc_doorbell_irq[id], chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) spin_lock_irqsave(&chan->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) chan->cl = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) chan->active_req = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (chan->txdone_method == TXDONE_BY_ACK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) chan->txdone_method = TXDONE_BY_POLL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) spin_unlock_irqrestore(&chan->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) EXPORT_SYMBOL_GPL(pcc_mbox_free_channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * pcc_send_data - Called from Mailbox Controller code. Used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * here only to ring the channel doorbell. The PCC client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * specific read/write is done in the client driver in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) * order to maintain atomicity over PCC channel once
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * OS has control over it. See above for flow of operations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * @chan: Pointer to Mailbox channel over which to send data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) * @data: Client specific data written over channel. Used here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) * only for debug after PCC transaction completes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) * Return: Err if something failed else 0 for success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) static int pcc_send_data(struct mbox_chan *chan, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct acpi_pcct_hw_reduced *pcct_ss = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) struct acpi_generic_address *doorbell;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) u64 doorbell_preserve;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) u64 doorbell_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) u64 doorbell_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) u32 id = chan - pcc_mbox_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) if (id >= pcc_mbox_ctrl.num_chans) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) pr_debug("pcc_send_data: Invalid mbox_chan passed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) doorbell = &pcct_ss->doorbell_register;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) doorbell_preserve = pcct_ss->preserve_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) doorbell_write = pcct_ss->write_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) /* Sync notification from OS to Platform. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (pcc_doorbell_vaddr[id]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) ret = read_register(pcc_doorbell_vaddr[id], &doorbell_val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) doorbell->bit_width);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) ret = write_register(pcc_doorbell_vaddr[id],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) (doorbell_val & doorbell_preserve) | doorbell_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) doorbell->bit_width);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) ret = acpi_read(&doorbell_val, doorbell);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) ret = acpi_write((doorbell_val & doorbell_preserve) | doorbell_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) doorbell);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) static const struct mbox_chan_ops pcc_chan_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) .send_data = pcc_send_data,
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * parse_pcc_subspaces -- Count PCC subspaces defined
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) * @header: Pointer to the ACPI subtable header under the PCCT.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) * @end: End of subtable entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * Return: If we find a PCC subspace entry of a valid type, return 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * Otherwise, return -EINVAL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * This gets called for each entry in the PCC table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) static int parse_pcc_subspace(union acpi_subtable_headers *header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) const unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) struct acpi_pcct_subspace *ss = (struct acpi_pcct_subspace *) header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) if (ss->header.type < ACPI_PCCT_TYPE_RESERVED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * pcc_parse_subspace_irq - Parse the PCC IRQ and PCC ACK register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * There should be one entry per PCC client.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) * @id: PCC subspace index.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) * @pcct_ss: Pointer to the ACPI subtable header under the PCCT.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) * Return: 0 for Success, else errno.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) * This gets called for each entry in the PCC table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static int pcc_parse_subspace_irq(int id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) struct acpi_pcct_hw_reduced *pcct_ss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) pcc_doorbell_irq[id] = pcc_map_interrupt(pcct_ss->platform_interrupt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) (u32)pcct_ss->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (pcc_doorbell_irq[id] <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) pr_err("PCC GSI %d not registered\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) pcct_ss->platform_interrupt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (pcct_ss->header.type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) struct acpi_pcct_hw_reduced_type2 *pcct2_ss = (void *)pcct_ss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) pcc_doorbell_ack_vaddr[id] = acpi_os_ioremap(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) pcct2_ss->platform_ack_register.address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) pcct2_ss->platform_ack_register.bit_width / 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (!pcc_doorbell_ack_vaddr[id]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) pr_err("Failed to ioremap PCC ACK register\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * acpi_pcc_probe - Parse the ACPI tree for the PCCT.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * Return: 0 for Success, else errno.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) static int __init acpi_pcc_probe(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) struct acpi_table_header *pcct_tbl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) struct acpi_subtable_header *pcct_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) struct acpi_table_pcct *acpi_pcct_tbl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) struct acpi_subtable_proc proc[ACPI_PCCT_TYPE_RESERVED];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) int count, i, rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) acpi_status status = AE_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) /* Search for PCCT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) status = acpi_get_table(ACPI_SIG_PCCT, 0, &pcct_tbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if (ACPI_FAILURE(status) || !pcct_tbl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) /* Set up the subtable handlers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) for (i = ACPI_PCCT_TYPE_GENERIC_SUBSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) i < ACPI_PCCT_TYPE_RESERVED; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) proc[i].id = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) proc[i].count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) proc[i].handler = parse_pcc_subspace;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) count = acpi_table_parse_entries_array(ACPI_SIG_PCCT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) sizeof(struct acpi_table_pcct), proc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) ACPI_PCCT_TYPE_RESERVED, MAX_PCC_SUBSPACES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) if (count <= 0 || count > MAX_PCC_SUBSPACES) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (count < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) pr_warn("Error parsing PCC subspaces from PCCT\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) pr_warn("Invalid PCCT: %d PCC subspaces\n", count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) goto err_put_pcct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) pcc_mbox_channels = kcalloc(count, sizeof(struct mbox_chan),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) if (!pcc_mbox_channels) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) pr_err("Could not allocate space for PCC mbox channels\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) goto err_put_pcct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) pcc_doorbell_vaddr = kcalloc(count, sizeof(void *), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (!pcc_doorbell_vaddr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) goto err_free_mbox;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) pcc_doorbell_ack_vaddr = kcalloc(count, sizeof(void *), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) if (!pcc_doorbell_ack_vaddr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) goto err_free_db_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) pcc_doorbell_irq = kcalloc(count, sizeof(int), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (!pcc_doorbell_irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) goto err_free_db_ack_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) /* Point to the first PCC subspace entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) pcct_entry = (struct acpi_subtable_header *) (
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) (unsigned long) pcct_tbl + sizeof(struct acpi_table_pcct));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) acpi_pcct_tbl = (struct acpi_table_pcct *) pcct_tbl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (acpi_pcct_tbl->flags & ACPI_PCCT_DOORBELL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) pcc_mbox_ctrl.txdone_irq = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) for (i = 0; i < count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) struct acpi_generic_address *db_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) struct acpi_pcct_subspace *pcct_ss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) pcc_mbox_channels[i].con_priv = pcct_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (pcct_entry->type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) pcct_entry->type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) struct acpi_pcct_hw_reduced *pcct_hrss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) pcct_hrss = (struct acpi_pcct_hw_reduced *) pcct_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (pcc_mbox_ctrl.txdone_irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) rc = pcc_parse_subspace_irq(i, pcct_hrss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (rc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) pcct_ss = (struct acpi_pcct_subspace *) pcct_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) /* If doorbell is in system memory cache the virt address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) db_reg = &pcct_ss->doorbell_register;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) if (db_reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) pcc_doorbell_vaddr[i] = acpi_os_ioremap(db_reg->address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) db_reg->bit_width/8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) pcct_entry = (struct acpi_subtable_header *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) ((unsigned long) pcct_entry + pcct_entry->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) pcc_mbox_ctrl.num_chans = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) pr_info("Detected %d PCC Subspaces\n", pcc_mbox_ctrl.num_chans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) kfree(pcc_doorbell_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) err_free_db_ack_vaddr:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) kfree(pcc_doorbell_ack_vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) err_free_db_vaddr:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) kfree(pcc_doorbell_vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) err_free_mbox:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) kfree(pcc_mbox_channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) err_put_pcct:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) acpi_put_table(pcct_tbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) * pcc_mbox_probe - Called when we find a match for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) * PCCT platform device. This is purely used to represent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) * the PCCT as a virtual device for registering with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) * generic Mailbox framework.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) * @pdev: Pointer to platform device returned when a match
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) * is found.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) * Return: 0 for Success, else errno.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) static int pcc_mbox_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) pcc_mbox_ctrl.chans = pcc_mbox_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) pcc_mbox_ctrl.ops = &pcc_chan_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) pcc_mbox_ctrl.dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) pr_info("Registering PCC driver as Mailbox controller\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) ret = mbox_controller_register(&pcc_mbox_ctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) pr_err("Err registering PCC as Mailbox controller: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) static struct platform_driver pcc_mbox_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) .probe = pcc_mbox_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) .name = "PCCT",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) static int __init pcc_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) struct platform_device *pcc_pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) if (acpi_disabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) /* Check if PCC support is available. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) ret = acpi_pcc_probe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) pr_debug("ACPI PCC probe failed.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) pcc_pdev = platform_create_bundle(&pcc_mbox_driver,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) pcc_mbox_probe, NULL, 0, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) if (IS_ERR(pcc_pdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) pr_debug("Err creating PCC platform bundle\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) return PTR_ERR(pcc_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) * Make PCC init postcore so that users of this mailbox
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) * such as the ACPI Processor driver have it available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) * at their init.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) postcore_initcall(pcc_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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