651 lines
17 KiB
C
651 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Hisilicon Limited, All Rights Reserved.
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* Author: Zhichang Yuan <yuanzhichang@hisilicon.com>
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* Author: Zou Rongrong <zourongrong@huawei.com>
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* Author: John Garry <john.garry@huawei.com>
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*/
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#include <linux/acpi.h>
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#include <linux/console.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/logic_pio.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/pci.h>
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#include <linux/serial_8250.h>
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#include <linux/slab.h>
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#define DRV_NAME "hisi-lpc"
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/*
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* Setting this bit means each IO operation will target a different port
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* address; 0 means repeated IO operations will use the same port,
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* such as BT.
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*/
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#define FG_INCRADDR_LPC 0x02
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struct lpc_cycle_para {
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unsigned int opflags;
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unsigned int csize; /* data length of each operation */
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};
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struct hisi_lpc_dev {
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spinlock_t cycle_lock;
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void __iomem *membase;
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struct logic_pio_hwaddr *io_host;
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};
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/* The max IO cycle counts supported is four per operation at maximum */
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#define LPC_MAX_DWIDTH 4
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#define LPC_REG_STARTUP_SIGNAL 0x00
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#define LPC_REG_STARTUP_SIGNAL_START BIT(0)
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#define LPC_REG_OP_STATUS 0x04
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#define LPC_REG_OP_STATUS_IDLE BIT(0)
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#define LPC_REG_OP_STATUS_FINISHED BIT(1)
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#define LPC_REG_OP_LEN 0x10 /* LPC cycles count per start */
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#define LPC_REG_CMD 0x14
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#define LPC_REG_CMD_OP BIT(0) /* 0: read, 1: write */
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#define LPC_REG_CMD_SAMEADDR BIT(3)
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#define LPC_REG_ADDR 0x20 /* target address */
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#define LPC_REG_WDATA 0x24 /* write FIFO */
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#define LPC_REG_RDATA 0x28 /* read FIFO */
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/* The minimal nanosecond interval for each query on LPC cycle status */
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#define LPC_NSEC_PERWAIT 100
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/*
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* The maximum waiting time is about 128us. It is specific for stream I/O,
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* such as ins.
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*
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* The fastest IO cycle time is about 390ns, but the worst case will wait
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* for extra 256 lpc clocks, so (256 + 13) * 30ns = 8 us. The maximum burst
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* cycles is 16. So, the maximum waiting time is about 128us under worst
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* case.
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*
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* Choose 1300 as the maximum.
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*/
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#define LPC_MAX_WAITCNT 1300
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/* About 10us. This is specific for single IO operations, such as inb */
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#define LPC_PEROP_WAITCNT 100
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static int wait_lpc_idle(unsigned char *mbase, unsigned int waitcnt)
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{
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u32 status;
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do {
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status = readl(mbase + LPC_REG_OP_STATUS);
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if (status & LPC_REG_OP_STATUS_IDLE)
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return (status & LPC_REG_OP_STATUS_FINISHED) ? 0 : -EIO;
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ndelay(LPC_NSEC_PERWAIT);
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} while (--waitcnt);
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return -ETIME;
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}
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/*
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* hisi_lpc_target_in - trigger a series of LPC cycles for read operation
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* @lpcdev: pointer to hisi lpc device
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* @para: some parameters used to control the lpc I/O operations
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* @addr: the lpc I/O target port address
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* @buf: where the read back data is stored
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* @opcnt: how many I/O operations required, i.e. data width
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*
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* Returns 0 on success, non-zero on fail.
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*/
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static int hisi_lpc_target_in(struct hisi_lpc_dev *lpcdev,
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struct lpc_cycle_para *para, unsigned long addr,
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unsigned char *buf, unsigned long opcnt)
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{
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unsigned int cmd_word;
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unsigned int waitcnt;
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unsigned long flags;
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int ret;
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if (!buf || !opcnt || !para || !para->csize || !lpcdev)
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return -EINVAL;
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cmd_word = 0; /* IO mode, Read */
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waitcnt = LPC_PEROP_WAITCNT;
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if (!(para->opflags & FG_INCRADDR_LPC)) {
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cmd_word |= LPC_REG_CMD_SAMEADDR;
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waitcnt = LPC_MAX_WAITCNT;
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}
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/* whole operation must be atomic */
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spin_lock_irqsave(&lpcdev->cycle_lock, flags);
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writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN);
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writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD);
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writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR);
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writel(LPC_REG_STARTUP_SIGNAL_START,
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lpcdev->membase + LPC_REG_STARTUP_SIGNAL);
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/* whether the operation is finished */
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ret = wait_lpc_idle(lpcdev->membase, waitcnt);
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if (ret) {
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spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);
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return ret;
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}
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readsb(lpcdev->membase + LPC_REG_RDATA, buf, opcnt);
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spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);
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return 0;
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}
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/*
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* hisi_lpc_target_out - trigger a series of LPC cycles for write operation
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* @lpcdev: pointer to hisi lpc device
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* @para: some parameters used to control the lpc I/O operations
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* @addr: the lpc I/O target port address
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* @buf: where the data to be written is stored
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* @opcnt: how many I/O operations required, i.e. data width
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*
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* Returns 0 on success, non-zero on fail.
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*/
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static int hisi_lpc_target_out(struct hisi_lpc_dev *lpcdev,
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struct lpc_cycle_para *para, unsigned long addr,
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const unsigned char *buf, unsigned long opcnt)
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{
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unsigned int waitcnt;
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unsigned long flags;
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u32 cmd_word;
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int ret;
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if (!buf || !opcnt || !para || !lpcdev)
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return -EINVAL;
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/* default is increasing address */
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cmd_word = LPC_REG_CMD_OP; /* IO mode, write */
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waitcnt = LPC_PEROP_WAITCNT;
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if (!(para->opflags & FG_INCRADDR_LPC)) {
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cmd_word |= LPC_REG_CMD_SAMEADDR;
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waitcnt = LPC_MAX_WAITCNT;
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}
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spin_lock_irqsave(&lpcdev->cycle_lock, flags);
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writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN);
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writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD);
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writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR);
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writesb(lpcdev->membase + LPC_REG_WDATA, buf, opcnt);
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writel(LPC_REG_STARTUP_SIGNAL_START,
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lpcdev->membase + LPC_REG_STARTUP_SIGNAL);
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/* whether the operation is finished */
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ret = wait_lpc_idle(lpcdev->membase, waitcnt);
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spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);
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return ret;
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}
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static unsigned long hisi_lpc_pio_to_addr(struct hisi_lpc_dev *lpcdev,
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unsigned long pio)
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{
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return pio - lpcdev->io_host->io_start + lpcdev->io_host->hw_start;
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}
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/*
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* hisi_lpc_comm_in - input the data in a single operation
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* @hostdata: pointer to the device information relevant to LPC controller
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* @pio: the target I/O port address
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* @dwidth: the data length required to read from the target I/O port
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*
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* When success, data is returned. Otherwise, ~0 is returned.
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*/
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static u32 hisi_lpc_comm_in(void *hostdata, unsigned long pio, size_t dwidth)
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{
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struct hisi_lpc_dev *lpcdev = hostdata;
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struct lpc_cycle_para iopara;
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unsigned long addr;
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u32 rd_data = 0;
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int ret;
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if (!lpcdev || !dwidth || dwidth > LPC_MAX_DWIDTH)
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return ~0;
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addr = hisi_lpc_pio_to_addr(lpcdev, pio);
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iopara.opflags = FG_INCRADDR_LPC;
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iopara.csize = dwidth;
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ret = hisi_lpc_target_in(lpcdev, &iopara, addr,
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(unsigned char *)&rd_data, dwidth);
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if (ret)
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return ~0;
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return le32_to_cpu(rd_data);
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}
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/*
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* hisi_lpc_comm_out - output the data in a single operation
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* @hostdata: pointer to the device information relevant to LPC controller
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* @pio: the target I/O port address
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* @val: a value to be output from caller, maximum is four bytes
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* @dwidth: the data width required writing to the target I/O port
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*
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* This function corresponds to out(b,w,l) only.
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*/
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static void hisi_lpc_comm_out(void *hostdata, unsigned long pio,
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u32 val, size_t dwidth)
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{
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struct hisi_lpc_dev *lpcdev = hostdata;
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struct lpc_cycle_para iopara;
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const unsigned char *buf;
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unsigned long addr;
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if (!lpcdev || !dwidth || dwidth > LPC_MAX_DWIDTH)
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return;
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val = cpu_to_le32(val);
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buf = (const unsigned char *)&val;
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addr = hisi_lpc_pio_to_addr(lpcdev, pio);
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iopara.opflags = FG_INCRADDR_LPC;
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iopara.csize = dwidth;
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hisi_lpc_target_out(lpcdev, &iopara, addr, buf, dwidth);
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}
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/*
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* hisi_lpc_comm_ins - input the data in the buffer in multiple operations
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* @hostdata: pointer to the device information relevant to LPC controller
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* @pio: the target I/O port address
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* @buffer: a buffer where read/input data bytes are stored
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* @dwidth: the data width required writing to the target I/O port
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* @count: how many data units whose length is dwidth will be read
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*
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* When success, the data read back is stored in buffer pointed by buffer.
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* Returns 0 on success, -errno otherwise.
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*/
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static u32 hisi_lpc_comm_ins(void *hostdata, unsigned long pio, void *buffer,
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size_t dwidth, unsigned int count)
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{
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struct hisi_lpc_dev *lpcdev = hostdata;
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unsigned char *buf = buffer;
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struct lpc_cycle_para iopara;
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unsigned long addr;
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if (!lpcdev || !buf || !count || !dwidth || dwidth > LPC_MAX_DWIDTH)
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return -EINVAL;
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iopara.opflags = 0;
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if (dwidth > 1)
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iopara.opflags |= FG_INCRADDR_LPC;
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iopara.csize = dwidth;
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addr = hisi_lpc_pio_to_addr(lpcdev, pio);
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do {
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int ret;
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ret = hisi_lpc_target_in(lpcdev, &iopara, addr, buf, dwidth);
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if (ret)
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return ret;
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buf += dwidth;
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} while (--count);
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return 0;
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}
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/*
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* hisi_lpc_comm_outs - output the data in the buffer in multiple operations
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* @hostdata: pointer to the device information relevant to LPC controller
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* @pio: the target I/O port address
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* @buffer: a buffer where write/output data bytes are stored
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* @dwidth: the data width required writing to the target I/O port
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* @count: how many data units whose length is dwidth will be written
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*/
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static void hisi_lpc_comm_outs(void *hostdata, unsigned long pio,
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const void *buffer, size_t dwidth,
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unsigned int count)
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{
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struct hisi_lpc_dev *lpcdev = hostdata;
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struct lpc_cycle_para iopara;
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const unsigned char *buf = buffer;
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unsigned long addr;
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if (!lpcdev || !buf || !count || !dwidth || dwidth > LPC_MAX_DWIDTH)
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return;
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iopara.opflags = 0;
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if (dwidth > 1)
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iopara.opflags |= FG_INCRADDR_LPC;
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iopara.csize = dwidth;
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addr = hisi_lpc_pio_to_addr(lpcdev, pio);
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do {
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if (hisi_lpc_target_out(lpcdev, &iopara, addr, buf, dwidth))
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break;
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buf += dwidth;
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} while (--count);
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}
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static const struct logic_pio_host_ops hisi_lpc_ops = {
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.in = hisi_lpc_comm_in,
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.out = hisi_lpc_comm_out,
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.ins = hisi_lpc_comm_ins,
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.outs = hisi_lpc_comm_outs,
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};
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#ifdef CONFIG_ACPI
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static int hisi_lpc_acpi_xlat_io_res(struct acpi_device *adev,
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struct acpi_device *host,
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struct resource *res)
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{
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unsigned long sys_port;
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resource_size_t len = resource_size(res);
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sys_port = logic_pio_trans_hwaddr(&host->fwnode, res->start, len);
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if (sys_port == ~0UL)
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return -EFAULT;
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res->start = sys_port;
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res->end = sys_port + len;
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return 0;
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}
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/*
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* hisi_lpc_acpi_set_io_res - set the resources for a child
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* @child: the device node to be updated the I/O resource
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* @hostdev: the device node associated with host controller
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* @res: double pointer to be set to the address of translated resources
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* @num_res: pointer to variable to hold the number of translated resources
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*
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* Returns 0 when successful, and a negative value for failure.
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*
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* For a given host controller, each child device will have an associated
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* host-relative address resource. This function will return the translated
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* logical PIO addresses for each child devices resources.
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*/
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static int hisi_lpc_acpi_set_io_res(struct device *child,
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struct device *hostdev,
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const struct resource **res, int *num_res)
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{
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struct acpi_device *adev;
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struct acpi_device *host;
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struct resource_entry *rentry;
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LIST_HEAD(resource_list);
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struct resource *resources;
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int count;
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int i;
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if (!child || !hostdev)
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return -EINVAL;
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host = to_acpi_device(hostdev);
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adev = to_acpi_device(child);
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if (!adev->status.present) {
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dev_dbg(child, "device is not present\n");
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return -EIO;
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}
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if (acpi_device_enumerated(adev)) {
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dev_dbg(child, "has been enumerated\n");
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return -EIO;
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}
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/*
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* The following code segment to retrieve the resources is common to
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* acpi_create_platform_device(), so consider a common helper function
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* in future.
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*/
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count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
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if (count <= 0) {
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dev_dbg(child, "failed to get resources\n");
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return count ? count : -EIO;
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}
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resources = devm_kcalloc(hostdev, count, sizeof(*resources),
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GFP_KERNEL);
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if (!resources) {
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dev_warn(hostdev, "could not allocate memory for %d resources\n",
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count);
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acpi_dev_free_resource_list(&resource_list);
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return -ENOMEM;
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}
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count = 0;
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list_for_each_entry(rentry, &resource_list, node)
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resources[count++] = *rentry->res;
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acpi_dev_free_resource_list(&resource_list);
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/* translate the I/O resources */
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for (i = 0; i < count; i++) {
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int ret;
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if (!(resources[i].flags & IORESOURCE_IO))
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continue;
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ret = hisi_lpc_acpi_xlat_io_res(adev, host, &resources[i]);
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if (ret) {
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dev_err(child, "translate IO range %pR failed (%d)\n",
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&resources[i], ret);
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return ret;
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}
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}
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*res = resources;
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*num_res = count;
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return 0;
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}
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static int hisi_lpc_acpi_remove_subdev(struct device *dev, void *unused)
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{
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platform_device_unregister(to_platform_device(dev));
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return 0;
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}
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struct hisi_lpc_acpi_cell {
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const char *hid;
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const char *name;
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void *pdata;
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size_t pdata_size;
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};
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/*
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* hisi_lpc_acpi_probe - probe children for ACPI FW
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* @hostdev: LPC host device pointer
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*
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* Returns 0 when successful, and a negative value for failure.
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*
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* Create a platform device per child, fixing up the resources
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* from bus addresses to Logical PIO addresses.
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*
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*/
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static int hisi_lpc_acpi_probe(struct device *hostdev)
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{
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struct acpi_device *adev = ACPI_COMPANION(hostdev);
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struct acpi_device *child;
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int ret;
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/* Only consider the children of the host */
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list_for_each_entry(child, &adev->children, node) {
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const char *hid = acpi_device_hid(child);
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const struct hisi_lpc_acpi_cell *cell;
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struct platform_device *pdev;
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const struct resource *res;
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bool found = false;
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int num_res;
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ret = hisi_lpc_acpi_set_io_res(&child->dev, &adev->dev, &res,
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&num_res);
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if (ret) {
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dev_warn(hostdev, "set resource fail (%d)\n", ret);
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goto fail;
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}
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cell = (struct hisi_lpc_acpi_cell []){
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/* ipmi */
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{
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.hid = "IPI0001",
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.name = "hisi-lpc-ipmi",
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},
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/* 8250-compatible uart */
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{
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.hid = "HISI1031",
|
|
.name = "serial8250",
|
|
.pdata = (struct plat_serial8250_port []) {
|
|
{
|
|
.iobase = res->start,
|
|
.uartclk = 1843200,
|
|
.iotype = UPIO_PORT,
|
|
.flags = UPF_BOOT_AUTOCONF,
|
|
},
|
|
{}
|
|
},
|
|
.pdata_size = 2 *
|
|
sizeof(struct plat_serial8250_port),
|
|
},
|
|
{}
|
|
};
|
|
|
|
for (; cell && cell->name; cell++) {
|
|
if (!strcmp(cell->hid, hid)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
dev_warn(hostdev,
|
|
"could not find cell for child device (%s)\n",
|
|
hid);
|
|
ret = -ENODEV;
|
|
goto fail;
|
|
}
|
|
|
|
pdev = platform_device_alloc(cell->name, PLATFORM_DEVID_AUTO);
|
|
if (!pdev) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
pdev->dev.parent = hostdev;
|
|
ACPI_COMPANION_SET(&pdev->dev, child);
|
|
|
|
ret = platform_device_add_resources(pdev, res, num_res);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
ret = platform_device_add_data(pdev, cell->pdata,
|
|
cell->pdata_size);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
ret = platform_device_add(pdev);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
acpi_device_set_enumerated(child);
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
device_for_each_child(hostdev, NULL,
|
|
hisi_lpc_acpi_remove_subdev);
|
|
return ret;
|
|
}
|
|
|
|
static const struct acpi_device_id hisi_lpc_acpi_match[] = {
|
|
{"HISI0191"},
|
|
{}
|
|
};
|
|
#else
|
|
static int hisi_lpc_acpi_probe(struct device *dev)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
#endif // CONFIG_ACPI
|
|
|
|
/*
|
|
* hisi_lpc_probe - the probe callback function for hisi lpc host,
|
|
* will finish all the initialization.
|
|
* @pdev: the platform device corresponding to hisi lpc host
|
|
*
|
|
* Returns 0 on success, non-zero on fail.
|
|
*/
|
|
static int hisi_lpc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct acpi_device *acpi_device = ACPI_COMPANION(dev);
|
|
struct logic_pio_hwaddr *range;
|
|
struct hisi_lpc_dev *lpcdev;
|
|
resource_size_t io_end;
|
|
struct resource *res;
|
|
int ret;
|
|
|
|
lpcdev = devm_kzalloc(dev, sizeof(*lpcdev), GFP_KERNEL);
|
|
if (!lpcdev)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&lpcdev->cycle_lock);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
lpcdev->membase = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(lpcdev->membase))
|
|
return PTR_ERR(lpcdev->membase);
|
|
|
|
range = devm_kzalloc(dev, sizeof(*range), GFP_KERNEL);
|
|
if (!range)
|
|
return -ENOMEM;
|
|
|
|
range->fwnode = dev->fwnode;
|
|
range->flags = LOGIC_PIO_INDIRECT;
|
|
range->size = PIO_INDIRECT_SIZE;
|
|
|
|
ret = logic_pio_register_range(range);
|
|
if (ret) {
|
|
dev_err(dev, "register IO range failed (%d)!\n", ret);
|
|
return ret;
|
|
}
|
|
lpcdev->io_host = range;
|
|
|
|
/* register the LPC host PIO resources */
|
|
if (acpi_device)
|
|
ret = hisi_lpc_acpi_probe(dev);
|
|
else
|
|
ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
lpcdev->io_host->hostdata = lpcdev;
|
|
lpcdev->io_host->ops = &hisi_lpc_ops;
|
|
|
|
io_end = lpcdev->io_host->io_start + lpcdev->io_host->size;
|
|
dev_info(dev, "registered range [%pa - %pa]\n",
|
|
&lpcdev->io_host->io_start, &io_end);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct of_device_id hisi_lpc_of_match[] = {
|
|
{ .compatible = "hisilicon,hip06-lpc", },
|
|
{ .compatible = "hisilicon,hip07-lpc", },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver hisi_lpc_driver = {
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.of_match_table = hisi_lpc_of_match,
|
|
.acpi_match_table = ACPI_PTR(hisi_lpc_acpi_match),
|
|
},
|
|
.probe = hisi_lpc_probe,
|
|
};
|
|
builtin_platform_driver(hisi_lpc_driver);
|