On some platforms(such as Hip06/Hip07), the legacy ISA/LPC devices access I/O with some special host-local I/O ports known on x86. To access the I/O peripherals, an indirect-IO mechanism is introduced to mapped the host-local I/O to system logical/fake PIO similar the PCI MMIO on architectures where no separate I/O space exists. Just as PCI MMIO, the host I/O range should be registered before probing the downstream devices and set up the I/O mapping. But current ACPI bus probing doesn't support these indirect-IO hosts/devices.
This patch introdueces a new ACPI handler for this device category. Through the handler attach callback, the indirect-IO hosts I/O registration is done and all peripherals' I/O resources are translated into logic/fake PIO before starting the enumeration. Signed-off-by: zhichang.yuan <[email protected]> Signed-off-by: Gabriele Paoloni <[email protected]> --- drivers/acpi/Makefile | 1 + drivers/acpi/acpi_indirectio.c | 344 +++++++++++++++++++++++++++++++++++++++++ drivers/acpi/internal.h | 5 + drivers/acpi/scan.c | 1 + 4 files changed, 351 insertions(+) create mode 100644 drivers/acpi/acpi_indirectio.c diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index a391bbc..10e5f2b 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -57,6 +57,7 @@ acpi-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o acpi-y += acpi_lpat.o acpi-$(CONFIG_ACPI_GENERIC_GSI) += irq.o acpi-$(CONFIG_ACPI_WATCHDOG) += acpi_watchdog.o +acpi-$(CONFIG_INDIRECT_PIO) += acpi_indirectio.o # These are (potentially) separate modules diff --git a/drivers/acpi/acpi_indirectio.c b/drivers/acpi/acpi_indirectio.c new file mode 100644 index 0000000..c8c80b5 --- /dev/null +++ b/drivers/acpi/acpi_indirectio.c @@ -0,0 +1,344 @@ +/* + * ACPI support for indirect-IO bus. + * + * Copyright (C) 2017 Hisilicon Limited, All Rights Reserved. + * Author: Zhichang Yuan <[email protected]> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/acpi.h> +#include <linux/platform_device.h> +#include <linux/logic_pio.h> + +#include "internal.h" + +ACPI_MODULE_NAME("indirect IO"); + +#define INDIRECT_IO_INFO(desc) ((unsigned long)&desc) + +struct lpc_private_data { + resource_size_t io_size; + resource_size_t io_start; +}; + +struct indirectio_device_desc { + void *pdata; /* device relevant info data */ + int (*pre_setup)(struct acpi_device *adev, void *pdata); +}; + +static struct lpc_private_data lpc_data = { + .io_size = LPC_BUS_IO_SIZE, + .io_start = LPC_MIN_BUS_RANGE, +}; + +static inline bool acpi_logicio_supported_resource(struct acpi_resource *res) +{ + switch (res->type) { + case ACPI_RESOURCE_TYPE_ADDRESS32: + case ACPI_RESOURCE_TYPE_ADDRESS64: + return true; + } + return false; +} + +static acpi_status acpi_count_logiciores(struct acpi_resource *res, + void *data) +{ + int *res_cnt = data; + + if (acpi_logicio_supported_resource(res) && + !acpi_dev_filter_resource_type(res, IORESOURCE_IO)) + (*res_cnt)++; + + return AE_OK; +} + +static acpi_status acpi_read_one_logiciores(struct acpi_resource *res, + void *data) +{ + struct acpi_resource **resource = data; + + if (acpi_logicio_supported_resource(res) && + !acpi_dev_filter_resource_type(res, IORESOURCE_IO)) { + memcpy((*resource), res, sizeof(struct acpi_resource)); + (*resource)->length = sizeof(struct acpi_resource); + (*resource)->type = res->type; + (*resource)++; + } + + return AE_OK; +} + +static acpi_status +acpi_build_logiciores_template(struct acpi_device *adev, + struct acpi_buffer *buffer) +{ + acpi_handle handle = adev->handle; + struct acpi_resource *resource; + acpi_status status; + int res_cnt = 0; + + status = acpi_walk_resources(handle, METHOD_NAME__CRS, + acpi_count_logiciores, &res_cnt); + if (ACPI_FAILURE(status) || !res_cnt) { + dev_err(&adev->dev, "can't evaluate _CRS: %d\n", status); + return -EINVAL; + } + + buffer->length = sizeof(struct acpi_resource) * (res_cnt + 1) + 1; + buffer->pointer = kzalloc(buffer->length - 1, GFP_KERNEL); + if (!buffer->pointer) + return -ENOMEM; + + resource = (struct acpi_resource *)buffer->pointer; + status = acpi_walk_resources(handle, METHOD_NAME__CRS, + acpi_read_one_logiciores, &resource); + if (ACPI_FAILURE(status)) { + kfree(buffer->pointer); + dev_err(&adev->dev, "can't evaluate _CRS: %d\n", status); + return -EINVAL; + } + + resource->type = ACPI_RESOURCE_TYPE_END_TAG; + resource->length = sizeof(struct acpi_resource); + + return 0; +} + +static int acpi_translate_logiciores(struct acpi_device *adev, + struct acpi_device *host, struct acpi_buffer *buffer) +{ + int res_cnt = (buffer->length - 1) / sizeof(struct acpi_resource) - 1; + struct acpi_resource *resource = buffer->pointer; + struct acpi_resource_address64 addr; + unsigned long sys_port; + struct device *dev = &adev->dev; + + /* only one I/O resource now */ + if (res_cnt != 1) { + dev_err(dev, "encode %d resources whose type is(%d)!\n", + res_cnt, resource->type); + return -EINVAL; + } + + if (ACPI_FAILURE(acpi_resource_to_address64(resource, &addr))) { + dev_err(dev, "convert acpi resource(%d) as addr64 FAIL!\n", + resource->type); + return -EFAULT; + } + + /* For indirect-IO, addr length must be fixed. (>0, 0/1, 0/1)(0,0,0) */ + if (addr.min_address_fixed != addr.max_address_fixed) { + dev_warn(dev, "variable I/O resource is invalid!\n"); + return -EINVAL; + } + + dev_info(dev, "CRS IO: len=0x%llx [0x%llx - 0x%llx]\n", + addr.address.address_length, addr.address.minimum, + addr.address.maximum); + sys_port = logic_pio_trans_hwaddr(&host->fwnode, addr.address.minimum); + if (sys_port == -1) { + dev_err(dev, "translate bus-addr(0x%llx) fail!\n", + addr.address.minimum); + return -EFAULT; + } + + switch (resource->type) { + case ACPI_RESOURCE_TYPE_ADDRESS32: + { + struct acpi_resource_address32 *out_res; + + out_res = &resource->data.address32; + if (!addr.address.address_length) + addr.address.address_length = out_res->address.maximum - + out_res->address.minimum + 1; + out_res->address.minimum = sys_port; + out_res->address.maximum = sys_port + + addr.address.address_length - 1; + out_res->address.address_length = addr.address.address_length; + + dev_info(dev, "_SRS 32IO: [0x%x - 0x%x] len = 0x%x\n", + out_res->address.minimum, + out_res->address.maximum, + out_res->address.address_length); + + break; + } + + case ACPI_RESOURCE_TYPE_ADDRESS64: + { + struct acpi_resource_address64 *out_res; + + out_res = &resource->data.address64; + if (!addr.address.address_length) + addr.address.address_length = out_res->address.maximum - + out_res->address.minimum + 1; + out_res->address.minimum = sys_port; + out_res->address.maximum = sys_port + + addr.address.address_length - 1; + out_res->address.address_length = addr.address.address_length; + + dev_info(dev, "_SRS 64IO: [0x%llx - 0x%llx] len = 0x%llx\n", + out_res->address.minimum, + out_res->address.maximum, + out_res->address.address_length); + + break; + } + + default: + return -EINVAL; + + } + + return 0; +} + +/* + * update/set the current I/O resource of the designated device node. + * after this calling, the enumeration can be started as the I/O resource + * had been translated to logicial I/O from bus-local I/O. + * + * @adev: the device node to be updated the I/O resource; + * @host: the device node where 'adev' is attached, which can be not + * the parent of 'adev'; + * + * return 0 when successful, negative is for failure. + */ +static int acpi_set_logicio_resource(struct device *child, + struct device *hostdev) +{ + struct acpi_device *adev; + struct acpi_device *host; + struct acpi_buffer buffer; + acpi_status status; + int ret; + + if (!child || !hostdev) + return -EINVAL; + + host = to_acpi_device(hostdev); + adev = to_acpi_device(child); + + /* check the device state */ + if (!adev->status.present) { + dev_info(child, "ACPI: device is not present!\n"); + return 0; + } + /* whether the child had been enumerated? */ + if (acpi_device_enumerated(adev)) { + dev_info(child, "ACPI: had been enumerated!\n"); + return 0; + } + + /* read the _CRS and convert as acpi_buffer */ + status = acpi_build_logiciores_template(adev, &buffer); + if (ACPI_FAILURE(status)) { + dev_warn(child, "Failure evaluating %s\n", METHOD_NAME__CRS); + return -ENODEV; + } + + /* translate the I/O resources */ + ret = acpi_translate_logiciores(adev, host, &buffer); + if (ret) { + kfree(buffer.pointer); + dev_err(child, "Translate I/O range FAIL!\n"); + return ret; + } + + /* set current resource... */ + status = acpi_set_current_resources(adev->handle, &buffer); + kfree(buffer.pointer); + if (ACPI_FAILURE(status)) { + dev_err(child, "Error evaluating _SRS (0x%x)\n", status); + ret = -EIO; + } + + return ret; +} + +static int lpc_host_io_setup(struct acpi_device *adev, void *pdata) +{ + struct logic_pio_hwaddr *range, *tmprange; + struct lpc_private_data *lpc_private; + struct acpi_device *child; + + lpc_private = (struct lpc_private_data *)pdata; + range = kzalloc(sizeof(*range), GFP_KERNEL); + if (!range) + return -ENOMEM; + range->fwnode = &adev->fwnode; + range->flags = PIO_INDIRECT; + range->size = lpc_private->io_size; + range->hw_start = lpc_private->io_start; + + tmprange = logic_pio_register_range(range, 1); + if (tmprange != range) { + kfree(range); + if (IS_ERR(tmprange)) + return -EFAULT; + } + + /* For hisilpc, only care about the sons of host. */ + list_for_each_entry(child, &adev->children, node) { + int ret; + + ret = acpi_set_logicio_resource(&child->dev, &adev->dev); + if (ret) { + dev_err(&child->dev, "set resource failed..\n"); + return ret; + } + } + + return 0; +} + +static const struct indirectio_device_desc lpc_host_desc = { + .pdata = &lpc_data, + .pre_setup = lpc_host_io_setup, +}; + +/* All the host devices which apply indirect-IO can be listed here. */ +static const struct acpi_device_id acpi_indirect_host_id[] = { + {"HISI0191", INDIRECT_IO_INFO(lpc_host_desc)}, + {""}, +}; + +static int acpi_indirectio_attach(struct acpi_device *adev, + const struct acpi_device_id *id) +{ + struct indirectio_device_desc *hostdata; + struct platform_device *pdev; + int ret; + + hostdata = (struct indirectio_device_desc *)id->driver_data; + if (!hostdata || !hostdata->pre_setup) + return -EINVAL; + + ret = hostdata->pre_setup(adev, hostdata->pdata); + if (!ret) { + pdev = acpi_create_platform_device(adev, NULL); + if (IS_ERR_OR_NULL(pdev)) { + dev_err(&adev->dev, "Create platform device for host FAIL!\n"); + return -EFAULT; + } + acpi_device_set_enumerated(adev); + ret = 1; + } + + return ret; +} + + +static struct acpi_scan_handler acpi_indirect_handler = { + .ids = acpi_indirect_host_id, + .attach = acpi_indirectio_attach, +}; + +void __init acpi_indirectio_scan_init(void) +{ + acpi_scan_add_handler(&acpi_indirect_handler); +} diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index f159001..b11412d 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -31,6 +31,11 @@ void acpi_platform_init(void); void acpi_pnp_init(void); void acpi_int340x_thermal_init(void); +#ifdef CONFIG_INDIRECT_PIO +void acpi_indirectio_scan_init(void); +#else +static inline void acpi_indirectio_scan_init(void) {} +#endif #ifdef CONFIG_ARM_AMBA void acpi_amba_init(void); #else diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 1926918..eda79ce 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -2033,6 +2033,7 @@ int __init acpi_scan_init(void) acpi_int340x_thermal_init(); acpi_amba_init(); acpi_watchdog_init(); + acpi_indirectio_scan_init(); acpi_scan_add_handler(&generic_device_handler); -- 1.9.1
