diff options
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/bus/Makefile | 1 | ||||
| -rw-r--r-- | drivers/bus/hisi_lpc.c | 415 |
3 files changed, 424 insertions, 0 deletions
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig index 57e011d36a79..a3fad0f0292f 100644 --- a/drivers/bus/Kconfig +++ b/drivers/bus/Kconfig @@ -65,6 +65,14 @@ config BRCMSTB_GISB_ARB arbiter. This driver provides timeout and target abort error handling and internal bus master decoding. +config HISILICON_LPC + bool "Support for ISA I/O space on HiSilicon Hip06/7" + depends on ARM64 && (ARCH_HISI || COMPILE_TEST) + select INDIRECT_PIO + help + Driver to enable I/O access to devices attached to the Low Pin + Count bus on the HiSilicon Hip06/7 SoC. + config IMX_WEIM bool "Freescale EIM DRIVER" depends on ARCH_MXC diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile index 9bcd0bf3954b..50bb12a971a0 100644 --- a/drivers/bus/Makefile +++ b/drivers/bus/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_ARM_CCI) += arm-cci.o obj-$(CONFIG_ARM_CCN) += arm-ccn.o +obj-$(CONFIG_HISILICON_LPC) += hisi_lpc.o obj-$(CONFIG_BRCMSTB_GISB_ARB) += brcmstb_gisb.o obj-$(CONFIG_IMX_WEIM) += imx-weim.o obj-$(CONFIG_MIPS_CDMM) += mips_cdmm.o diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c new file mode 100644 index 000000000000..6123bff3215f --- /dev/null +++ b/drivers/bus/hisi_lpc.c @@ -0,0 +1,415 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2017 Hisilicon Limited, All Rights Reserved. + * Author: Zhichang Yuan <yuanzhichang@hisilicon.com> + * Author: Zou Rongrong <zourongrong@huawei.com> + * Author: John Garry <john.garry@huawei.com> + */ + +#include <linux/acpi.h> +#include <linux/console.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/logic_pio.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/pci.h> +#include <linux/slab.h> + +#define DRV_NAME "hisi-lpc" + +/* + * Setting this bit means each IO operation will target a different port + * address; 0 means repeated IO operations will use the same port, + * such as BT. + */ +#define FG_INCRADDR_LPC 0x02 + +struct lpc_cycle_para { + unsigned int opflags; + unsigned int csize; /* data length of each operation */ +}; + +struct hisi_lpc_dev { + spinlock_t cycle_lock; + void __iomem *membase; + struct logic_pio_hwaddr *io_host; +}; + +/* The max IO cycle counts supported is four per operation at maximum */ +#define LPC_MAX_DWIDTH 4 + +#define LPC_REG_STARTUP_SIGNAL 0x00 +#define LPC_REG_STARTUP_SIGNAL_START BIT(0) +#define LPC_REG_OP_STATUS 0x04 +#define LPC_REG_OP_STATUS_IDLE BIT(0) +#define LPC_REG_OP_STATUS_FINISHED BIT(1) +#define LPC_REG_OP_LEN 0x10 /* LPC cycles count per start */ +#define LPC_REG_CMD 0x14 +#define LPC_REG_CMD_OP BIT(0) /* 0: read, 1: write */ +#define LPC_REG_CMD_SAMEADDR BIT(3) +#define LPC_REG_ADDR 0x20 /* target address */ +#define LPC_REG_WDATA 0x24 /* write FIFO */ +#define LPC_REG_RDATA 0x28 /* read FIFO */ + +/* The minimal nanosecond interval for each query on LPC cycle status */ +#define LPC_NSEC_PERWAIT 100 + +/* + * The maximum waiting time is about 128us. It is specific for stream I/O, + * such as ins. + * + * The fastest IO cycle time is about 390ns, but the worst case will wait + * for extra 256 lpc clocks, so (256 + 13) * 30ns = 8 us. The maximum burst + * cycles is 16. So, the maximum waiting time is about 128us under worst + * case. + * + * Choose 1300 as the maximum. + */ +#define LPC_MAX_WAITCNT 1300 + +/* About 10us. This is specific for single IO operations, such as inb */ +#define LPC_PEROP_WAITCNT 100 + +static int wait_lpc_idle(unsigned char *mbase, unsigned int waitcnt) +{ + u32 status; + + do { + status = readl(mbase + LPC_REG_OP_STATUS); + if (status & LPC_REG_OP_STATUS_IDLE) + return (status & LPC_REG_OP_STATUS_FINISHED) ? 0 : -EIO; + ndelay(LPC_NSEC_PERWAIT); + } while (--waitcnt); + + return -ETIME; +} + +/* + * hisi_lpc_target_in - trigger a series of LPC cycles for read operation + * @lpcdev: pointer to hisi lpc device + * @para: some parameters used to control the lpc I/O operations + * @addr: the lpc I/O target port address + * @buf: where the read back data is stored + * @opcnt: how many I/O operations required, i.e. data width + * + * Returns 0 on success, non-zero on fail. + */ +static int hisi_lpc_target_in(struct hisi_lpc_dev *lpcdev, + struct lpc_cycle_para *para, unsigned long addr, + unsigned char *buf, unsigned long opcnt) +{ + unsigned int cmd_word; + unsigned int waitcnt; + unsigned long flags; + int ret; + + if (!buf || !opcnt || !para || !para->csize || !lpcdev) + return -EINVAL; + + cmd_word = 0; /* IO mode, Read */ + waitcnt = LPC_PEROP_WAITCNT; + if (!(para->opflags & FG_INCRADDR_LPC)) { + cmd_word |= LPC_REG_CMD_SAMEADDR; + waitcnt = LPC_MAX_WAITCNT; + } + + /* whole operation must be atomic */ + spin_lock_irqsave(&lpcdev->cycle_lock, flags); + + writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN); + writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD); + writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR); + + writel(LPC_REG_STARTUP_SIGNAL_START, + lpcdev->membase + LPC_REG_STARTUP_SIGNAL); + + /* whether the operation is finished */ + ret = wait_lpc_idle(lpcdev->membase, waitcnt); + if (ret) { + spin_unlock_irqrestore(&lpcdev->cycle_lock, flags); + return ret; + } + + readsb(lpcdev->membase + LPC_REG_RDATA, buf, opcnt); + + spin_unlock_irqrestore(&lpcdev->cycle_lock, flags); + + return 0; +} + +/* + * hisi_lpc_target_out - trigger a series of LPC cycles for write operation + * @lpcdev: pointer to hisi lpc device + * @para: some parameters used to control the lpc I/O operations + * @addr: the lpc I/O target port address + * @buf: where the data to be written is stored + * @opcnt: how many I/O operations required, i.e. data width + * + * Returns 0 on success, non-zero on fail. + */ +static int hisi_lpc_target_out(struct hisi_lpc_dev *lpcdev, + struct lpc_cycle_para *para, unsigned long addr, + const unsigned char *buf, unsigned long opcnt) +{ + unsigned int waitcnt; + unsigned long flags; + u32 cmd_word; + int ret; + + if (!buf || !opcnt || !para || !lpcdev) + return -EINVAL; + + /* default is increasing address */ + cmd_word = LPC_REG_CMD_OP; /* IO mode, write */ + waitcnt = LPC_PEROP_WAITCNT; + if (!(para->opflags & FG_INCRADDR_LPC)) { + cmd_word |= LPC_REG_CMD_SAMEADDR; + waitcnt = LPC_MAX_WAITCNT; + } + + spin_lock_irqsave(&lpcdev->cycle_lock, flags); + + writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN); + writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD); + writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR); + + writesb(lpcdev->membase + LPC_REG_WDATA, buf, opcnt); + + writel(LPC_REG_STARTUP_SIGNAL_START, + lpcdev->membase + LPC_REG_STARTUP_SIGNAL); + + /* whether the operation is finished */ + ret = wait_lpc_idle(lpcdev->membase, waitcnt); + + spin_unlock_irqrestore(&lpcdev->cycle_lock, flags); + + return ret; +} + +static unsigned long hisi_lpc_pio_to_addr(struct hisi_lpc_dev *lpcdev, + unsigned long pio) +{ + return pio - lpcdev->io_host->io_start + lpcdev->io_host->hw_start; +} + +/* + * hisi_lpc_comm_in - input the data in a single operation + * @hostdata: pointer to the device information relevant to LPC controller + * @pio: the target I/O port address + * @dwidth: the data length required to read from the target I/O port + * + * When success, data is returned. Otherwise, ~0 is returned. + */ +static u32 hisi_lpc_comm_in(void *hostdata, unsigned long pio, size_t dwidth) +{ + struct hisi_lpc_dev *lpcdev = hostdata; + struct lpc_cycle_para iopara; + unsigned long addr; + u32 rd_data = 0; + int ret; + + if (!lpcdev || !dwidth || dwidth > LPC_MAX_DWIDTH) + return ~0; + + addr = hisi_lpc_pio_to_addr(lpcdev, pio); + + iopara.opflags = FG_INCRADDR_LPC; + iopara.csize = dwidth; + + ret = hisi_lpc_target_in(lpcdev, &iopara, addr, + (unsigned char *)&rd_data, dwidth); + if (ret) + return ~0; + + return le32_to_cpu(rd_data); +} + +/* + * hisi_lpc_comm_out - output the data in a single operation + * @hostdata: pointer to the device information relevant to LPC controller + * @pio: the target I/O port address + * @val: a value to be output from caller, maximum is four bytes + * @dwidth: the data width required writing to the target I/O port + * + * This function corresponds to out(b,w,l) only. + */ +static void hisi_lpc_comm_out(void *hostdata, unsigned long pio, + u32 val, size_t dwidth) +{ + struct hisi_lpc_dev *lpcdev = hostdata; + struct lpc_cycle_para iopara; + const unsigned char *buf; + unsigned long addr; + + if (!lpcdev || !dwidth || dwidth > LPC_MAX_DWIDTH) + return; + + val = cpu_to_le32(val); + + buf = (const unsigned char *)&val; + addr = hisi_lpc_pio_to_addr(lpcdev, pio); + + iopara.opflags = FG_INCRADDR_LPC; + iopara.csize = dwidth; + + hisi_lpc_target_out(lpcdev, &iopara, addr, buf, dwidth); +} + +/* + * hisi_lpc_comm_ins - input the data in the buffer in multiple operations + * @hostdata: pointer to the device information relevant to LPC controller + * @pio: the target I/O port address + * @buffer: a buffer where read/input data bytes are stored + * @dwidth: the data width required writing to the target I/O port + * @count: how many data units whose length is dwidth will be read + * + * When success, the data read back is stored in buffer pointed by buffer. + * Returns 0 on success, -errno otherwise. + */ +static u32 hisi_lpc_comm_ins(void *hostdata, unsigned long pio, void *buffer, + size_t dwidth, unsigned int count) +{ + struct hisi_lpc_dev *lpcdev = hostdata; + unsigned char *buf = buffer; + struct lpc_cycle_para iopara; + unsigned long addr; + + if (!lpcdev || !buf || !count || !dwidth || dwidth > LPC_MAX_DWIDTH) + return -EINVAL; + + iopara.opflags = 0; + if (dwidth > 1) + iopara.opflags |= FG_INCRADDR_LPC; + iopara.csize = dwidth; + + addr = hisi_lpc_pio_to_addr(lpcdev, pio); + + do { + int ret; + + ret = hisi_lpc_target_in(lpcdev, &iopara, addr, buf, dwidth); + if (ret) + return ret; + buf += dwidth; + } while (--count); + + return 0; +} + +/* + * hisi_lpc_comm_outs - output the data in the buffer in multiple operations + * @hostdata: pointer to the device information relevant to LPC controller + * @pio: the target I/O port address + * @buffer: a buffer where write/output data bytes are stored + * @dwidth: the data width required writing to the target I/O port + * @count: how many data units whose length is dwidth will be written + */ +static void hisi_lpc_comm_outs(void *hostdata, unsigned long pio, + const void *buffer, size_t dwidth, + unsigned int count) +{ + struct hisi_lpc_dev *lpcdev = hostdata; + struct lpc_cycle_para iopara; + const unsigned char *buf = buffer; + unsigned long addr; + + if (!lpcdev || !buf || !count || !dwidth || dwidth > LPC_MAX_DWIDTH) + return; + + iopara.opflags = 0; + if (dwidth > 1) + iopara.opflags |= FG_INCRADDR_LPC; + iopara.csize = dwidth; + + addr = hisi_lpc_pio_to_addr(lpcdev, pio); + do { + if (hisi_lpc_target_out(lpcdev, &iopara, addr, buf, dwidth)) + break; + buf += dwidth; + } while (--count); +} + +static const struct logic_pio_host_ops hisi_lpc_ops = { + .in = hisi_lpc_comm_in, + .out = hisi_lpc_comm_out, + .ins = hisi_lpc_comm_ins, + .outs = hisi_lpc_comm_outs, +}; + +/* + * 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 = 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, + }, + .probe = hisi_lpc_probe, +}; +builtin_platform_driver(hisi_lpc_driver); |