diff options
Diffstat (limited to 'drivers/misc/aspeed-lpc-ctrl.c')
| -rw-r--r-- | drivers/misc/aspeed-lpc-ctrl.c | 300 |
1 files changed, 0 insertions, 300 deletions
diff --git a/drivers/misc/aspeed-lpc-ctrl.c b/drivers/misc/aspeed-lpc-ctrl.c deleted file mode 100644 index a024f8042259..000000000000 --- a/drivers/misc/aspeed-lpc-ctrl.c +++ /dev/null @@ -1,300 +0,0 @@ -/* - * Copyright 2017 IBM Corporation - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include <linux/clk.h> -#include <linux/mfd/syscon.h> -#include <linux/miscdevice.h> -#include <linux/mm.h> -#include <linux/module.h> -#include <linux/of_address.h> -#include <linux/platform_device.h> -#include <linux/poll.h> -#include <linux/regmap.h> - -#include <linux/aspeed-lpc-ctrl.h> - -#define DEVICE_NAME "aspeed-lpc-ctrl" - -#define HICR5 0x0 -#define HICR5_ENL2H BIT(8) -#define HICR5_ENFWH BIT(10) - -#define HICR7 0x8 -#define HICR8 0xc - -struct aspeed_lpc_ctrl { - struct miscdevice miscdev; - struct regmap *regmap; - struct clk *clk; - phys_addr_t mem_base; - resource_size_t mem_size; - u32 pnor_size; - u32 pnor_base; -}; - -static struct aspeed_lpc_ctrl *file_aspeed_lpc_ctrl(struct file *file) -{ - return container_of(file->private_data, struct aspeed_lpc_ctrl, - miscdev); -} - -static int aspeed_lpc_ctrl_mmap(struct file *file, struct vm_area_struct *vma) -{ - struct aspeed_lpc_ctrl *lpc_ctrl = file_aspeed_lpc_ctrl(file); - unsigned long vsize = vma->vm_end - vma->vm_start; - pgprot_t prot = vma->vm_page_prot; - - if (vma->vm_pgoff + vsize > lpc_ctrl->mem_base + lpc_ctrl->mem_size) - return -EINVAL; - - /* ast2400/2500 AHB accesses are not cache coherent */ - prot = pgprot_noncached(prot); - - if (remap_pfn_range(vma, vma->vm_start, - (lpc_ctrl->mem_base >> PAGE_SHIFT) + vma->vm_pgoff, - vsize, prot)) - return -EAGAIN; - - return 0; -} - -static long aspeed_lpc_ctrl_ioctl(struct file *file, unsigned int cmd, - unsigned long param) -{ - struct aspeed_lpc_ctrl *lpc_ctrl = file_aspeed_lpc_ctrl(file); - void __user *p = (void __user *)param; - struct aspeed_lpc_ctrl_mapping map; - u32 addr; - u32 size; - long rc; - - if (copy_from_user(&map, p, sizeof(map))) - return -EFAULT; - - if (map.flags != 0) - return -EINVAL; - - switch (cmd) { - case ASPEED_LPC_CTRL_IOCTL_GET_SIZE: - /* The flash windows don't report their size */ - if (map.window_type != ASPEED_LPC_CTRL_WINDOW_MEMORY) - return -EINVAL; - - /* Support more than one window id in the future */ - if (map.window_id != 0) - return -EINVAL; - - map.size = lpc_ctrl->mem_size; - - return copy_to_user(p, &map, sizeof(map)) ? -EFAULT : 0; - case ASPEED_LPC_CTRL_IOCTL_MAP: - - /* - * The top half of HICR7 is the MSB of the BMC address of the - * mapping. - * The bottom half of HICR7 is the MSB of the HOST LPC - * firmware space address of the mapping. - * - * The 1 bits in the top of half of HICR8 represent the bits - * (in the requested address) that should be ignored and - * replaced with those from the top half of HICR7. - * The 1 bits in the bottom half of HICR8 represent the bits - * (in the requested address) that should be kept and pass - * into the BMC address space. - */ - - /* - * It doesn't make sense to talk about a size or offset with - * low 16 bits set. Both HICR7 and HICR8 talk about the top 16 - * bits of addresses and sizes. - */ - - if ((map.size & 0x0000ffff) || (map.offset & 0x0000ffff)) - return -EINVAL; - - /* - * Because of the way the masks work in HICR8 offset has to - * be a multiple of size. - */ - if (map.offset & (map.size - 1)) - return -EINVAL; - - if (map.window_type == ASPEED_LPC_CTRL_WINDOW_FLASH) { - addr = lpc_ctrl->pnor_base; - size = lpc_ctrl->pnor_size; - } else if (map.window_type == ASPEED_LPC_CTRL_WINDOW_MEMORY) { - addr = lpc_ctrl->mem_base; - size = lpc_ctrl->mem_size; - } else { - return -EINVAL; - } - - /* Check overflow first! */ - if (map.offset + map.size < map.offset || - map.offset + map.size > size) - return -EINVAL; - - if (map.size == 0 || map.size > size) - return -EINVAL; - - addr += map.offset; - - /* - * addr (host lpc address) is safe regardless of values. This - * simply changes the address the host has to request on its - * side of the LPC bus. This cannot impact the hosts own - * memory space by surprise as LPC specific accessors are - * required. The only strange thing that could be done is - * setting the lower 16 bits but the shift takes care of that. - */ - - rc = regmap_write(lpc_ctrl->regmap, HICR7, - (addr | (map.addr >> 16))); - if (rc) - return rc; - - rc = regmap_write(lpc_ctrl->regmap, HICR8, - (~(map.size - 1)) | ((map.size >> 16) - 1)); - if (rc) - return rc; - - /* - * Enable LPC FHW cycles. This is required for the host to - * access the regions specified. - */ - return regmap_update_bits(lpc_ctrl->regmap, HICR5, - HICR5_ENFWH | HICR5_ENL2H, - HICR5_ENFWH | HICR5_ENL2H); - } - - return -EINVAL; -} - -static const struct file_operations aspeed_lpc_ctrl_fops = { - .owner = THIS_MODULE, - .mmap = aspeed_lpc_ctrl_mmap, - .unlocked_ioctl = aspeed_lpc_ctrl_ioctl, -}; - -static int aspeed_lpc_ctrl_probe(struct platform_device *pdev) -{ - struct aspeed_lpc_ctrl *lpc_ctrl; - struct device_node *node; - struct resource resm; - struct device *dev; - int rc; - - dev = &pdev->dev; - - lpc_ctrl = devm_kzalloc(dev, sizeof(*lpc_ctrl), GFP_KERNEL); - if (!lpc_ctrl) - return -ENOMEM; - - node = of_parse_phandle(dev->of_node, "flash", 0); - if (!node) { - dev_err(dev, "Didn't find host pnor flash node\n"); - return -ENODEV; - } - - rc = of_address_to_resource(node, 1, &resm); - of_node_put(node); - if (rc) { - dev_err(dev, "Couldn't address to resource for flash\n"); - return rc; - } - - lpc_ctrl->pnor_size = resource_size(&resm); - lpc_ctrl->pnor_base = resm.start; - - dev_set_drvdata(&pdev->dev, lpc_ctrl); - - node = of_parse_phandle(dev->of_node, "memory-region", 0); - if (!node) { - dev_err(dev, "Didn't find reserved memory\n"); - return -EINVAL; - } - - rc = of_address_to_resource(node, 0, &resm); - of_node_put(node); - if (rc) { - dev_err(dev, "Couldn't address to resource for reserved memory\n"); - return -ENOMEM; - } - - lpc_ctrl->mem_size = resource_size(&resm); - lpc_ctrl->mem_base = resm.start; - - lpc_ctrl->regmap = syscon_node_to_regmap( - pdev->dev.parent->of_node); - if (IS_ERR(lpc_ctrl->regmap)) { - dev_err(dev, "Couldn't get regmap\n"); - return -ENODEV; - } - - lpc_ctrl->clk = devm_clk_get(dev, NULL); - if (IS_ERR(lpc_ctrl->clk)) { - dev_err(dev, "couldn't get clock\n"); - return PTR_ERR(lpc_ctrl->clk); - } - rc = clk_prepare_enable(lpc_ctrl->clk); - if (rc) { - dev_err(dev, "couldn't enable clock\n"); - return rc; - } - - lpc_ctrl->miscdev.minor = MISC_DYNAMIC_MINOR; - lpc_ctrl->miscdev.name = DEVICE_NAME; - lpc_ctrl->miscdev.fops = &aspeed_lpc_ctrl_fops; - lpc_ctrl->miscdev.parent = dev; - rc = misc_register(&lpc_ctrl->miscdev); - if (rc) { - dev_err(dev, "Unable to register device\n"); - goto err; - } - - dev_info(dev, "Loaded at %pr\n", &resm); - - return 0; - -err: - clk_disable_unprepare(lpc_ctrl->clk); - return rc; -} - -static int aspeed_lpc_ctrl_remove(struct platform_device *pdev) -{ - struct aspeed_lpc_ctrl *lpc_ctrl = dev_get_drvdata(&pdev->dev); - - misc_deregister(&lpc_ctrl->miscdev); - clk_disable_unprepare(lpc_ctrl->clk); - - return 0; -} - -static const struct of_device_id aspeed_lpc_ctrl_match[] = { - { .compatible = "aspeed,ast2400-lpc-ctrl" }, - { .compatible = "aspeed,ast2500-lpc-ctrl" }, - { }, -}; - -static struct platform_driver aspeed_lpc_ctrl_driver = { - .driver = { - .name = DEVICE_NAME, - .of_match_table = aspeed_lpc_ctrl_match, - }, - .probe = aspeed_lpc_ctrl_probe, - .remove = aspeed_lpc_ctrl_remove, -}; - -module_platform_driver(aspeed_lpc_ctrl_driver); - -MODULE_DEVICE_TABLE(of, aspeed_lpc_ctrl_match); -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Cyril Bur <cyrilbur@gmail.com>"); -MODULE_DESCRIPTION("Control for aspeed 2400/2500 LPC HOST to BMC mappings"); |