diff options
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/Kconfig | 24 | ||||
| -rw-r--r-- | drivers/misc/Makefile | 3 | ||||
| -rw-r--r-- | drivers/misc/aspeed-lpc-ctrl.c | 300 | ||||
| -rw-r--r-- | drivers/misc/aspeed-lpc-snoop.c | 349 | ||||
| -rw-r--r-- | drivers/misc/aspeed-p2a-ctrl.c | 444 |
5 files changed, 0 insertions, 1120 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 3209ee020b15..b80cb6af0cb4 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -496,30 +496,6 @@ config VEXPRESS_SYSCFG bus. System Configuration interface is one of the possible means of generating transactions on this bus. -config ASPEED_P2A_CTRL - depends on (ARCH_ASPEED || COMPILE_TEST) && REGMAP && MFD_SYSCON - tristate "Aspeed ast2400/2500 HOST P2A VGA MMIO to BMC bridge control" - help - Control Aspeed ast2400/2500 HOST P2A VGA MMIO to BMC mappings through - ioctl()s, the driver also provides an interface for userspace mappings to - a pre-defined region. - -config ASPEED_LPC_CTRL - depends on (ARCH_ASPEED || COMPILE_TEST) && REGMAP && MFD_SYSCON - tristate "Aspeed ast2400/2500 HOST LPC to BMC bridge control" - ---help--- - Control Aspeed ast2400/2500 HOST LPC to BMC mappings through - ioctl()s, the driver also provides a read/write interface to a BMC ram - region where the host LPC read/write region can be buffered. - -config ASPEED_LPC_SNOOP - tristate "Aspeed ast2500 HOST LPC snoop support" - depends on (ARCH_ASPEED || COMPILE_TEST) && REGMAP && MFD_SYSCON - help - Provides a driver to control the LPC snoop interface which - allows the BMC to listen on and save the data written by - the host to an arbitrary LPC I/O port. - config PCI_ENDPOINT_TEST depends on PCI select CRC32 diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index c36239573a5c..b9affcdaa3d6 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -54,9 +54,6 @@ obj-$(CONFIG_GENWQE) += genwqe/ obj-$(CONFIG_ECHO) += echo/ obj-$(CONFIG_VEXPRESS_SYSCFG) += vexpress-syscfg.o obj-$(CONFIG_CXL_BASE) += cxl/ -obj-$(CONFIG_ASPEED_LPC_CTRL) += aspeed-lpc-ctrl.o -obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o -obj-$(CONFIG_ASPEED_P2A_CTRL) += aspeed-p2a-ctrl.o obj-$(CONFIG_PCI_ENDPOINT_TEST) += pci_endpoint_test.o obj-$(CONFIG_OCXL) += ocxl/ obj-y += cardreader/ 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"); diff --git a/drivers/misc/aspeed-lpc-snoop.c b/drivers/misc/aspeed-lpc-snoop.c deleted file mode 100644 index 2feb4347d67f..000000000000 --- a/drivers/misc/aspeed-lpc-snoop.c +++ /dev/null @@ -1,349 +0,0 @@ -/* - * Copyright 2017 Google Inc - * - * 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. - * - * Provides a simple driver to control the ASPEED LPC snoop interface which - * allows the BMC to listen on and save the data written by - * the host to an arbitrary LPC I/O port. - * - * Typically used by the BMC to "watch" host boot progress via port - * 0x80 writes made by the BIOS during the boot process. - */ - -#include <linux/bitops.h> -#include <linux/interrupt.h> -#include <linux/fs.h> -#include <linux/kfifo.h> -#include <linux/mfd/syscon.h> -#include <linux/miscdevice.h> -#include <linux/module.h> -#include <linux/of.h> -#include <linux/of_device.h> -#include <linux/platform_device.h> -#include <linux/poll.h> -#include <linux/regmap.h> - -#define DEVICE_NAME "aspeed-lpc-snoop" - -#define NUM_SNOOP_CHANNELS 2 -#define SNOOP_FIFO_SIZE 2048 - -#define HICR5 0x0 -#define HICR5_EN_SNP0W BIT(0) -#define HICR5_ENINT_SNP0W BIT(1) -#define HICR5_EN_SNP1W BIT(2) -#define HICR5_ENINT_SNP1W BIT(3) - -#define HICR6 0x4 -#define HICR6_STR_SNP0W BIT(0) -#define HICR6_STR_SNP1W BIT(1) -#define SNPWADR 0x10 -#define SNPWADR_CH0_MASK GENMASK(15, 0) -#define SNPWADR_CH0_SHIFT 0 -#define SNPWADR_CH1_MASK GENMASK(31, 16) -#define SNPWADR_CH1_SHIFT 16 -#define SNPWDR 0x14 -#define SNPWDR_CH0_MASK GENMASK(7, 0) -#define SNPWDR_CH0_SHIFT 0 -#define SNPWDR_CH1_MASK GENMASK(15, 8) -#define SNPWDR_CH1_SHIFT 8 -#define HICRB 0x80 -#define HICRB_ENSNP0D BIT(14) -#define HICRB_ENSNP1D BIT(15) - -struct aspeed_lpc_snoop_model_data { - /* The ast2400 has bits 14 and 15 as reserved, whereas the ast2500 - * can use them. - */ - unsigned int has_hicrb_ensnp; -}; - -struct aspeed_lpc_snoop_channel { - struct kfifo fifo; - wait_queue_head_t wq; - struct miscdevice miscdev; -}; - -struct aspeed_lpc_snoop { - struct regmap *regmap; - int irq; - struct aspeed_lpc_snoop_channel chan[NUM_SNOOP_CHANNELS]; -}; - -static struct aspeed_lpc_snoop_channel *snoop_file_to_chan(struct file *file) -{ - return container_of(file->private_data, - struct aspeed_lpc_snoop_channel, - miscdev); -} - -static ssize_t snoop_file_read(struct file *file, char __user *buffer, - size_t count, loff_t *ppos) -{ - struct aspeed_lpc_snoop_channel *chan = snoop_file_to_chan(file); - unsigned int copied; - int ret = 0; - - if (kfifo_is_empty(&chan->fifo)) { - if (file->f_flags & O_NONBLOCK) - return -EAGAIN; - ret = wait_event_interruptible(chan->wq, - !kfifo_is_empty(&chan->fifo)); - if (ret == -ERESTARTSYS) - return -EINTR; - } - ret = kfifo_to_user(&chan->fifo, buffer, count, &copied); - - return ret ? ret : copied; -} - -static unsigned int snoop_file_poll(struct file *file, - struct poll_table_struct *pt) -{ - struct aspeed_lpc_snoop_channel *chan = snoop_file_to_chan(file); - - poll_wait(file, &chan->wq, pt); - return !kfifo_is_empty(&chan->fifo) ? POLLIN : 0; -} - -static const struct file_operations snoop_fops = { - .owner = THIS_MODULE, - .read = snoop_file_read, - .poll = snoop_file_poll, - .llseek = noop_llseek, -}; - -/* Save a byte to a FIFO and discard the oldest byte if FIFO is full */ -static void put_fifo_with_discard(struct aspeed_lpc_snoop_channel *chan, u8 val) -{ - if (!kfifo_initialized(&chan->fifo)) - return; - if (kfifo_is_full(&chan->fifo)) - kfifo_skip(&chan->fifo); - kfifo_put(&chan->fifo, val); - wake_up_interruptible(&chan->wq); -} - -static irqreturn_t aspeed_lpc_snoop_irq(int irq, void *arg) -{ - struct aspeed_lpc_snoop *lpc_snoop = arg; - u32 reg, data; - - if (regmap_read(lpc_snoop->regmap, HICR6, ®)) - return IRQ_NONE; - - /* Check if one of the snoop channels is interrupting */ - reg &= (HICR6_STR_SNP0W | HICR6_STR_SNP1W); - if (!reg) - return IRQ_NONE; - - /* Ack pending IRQs */ - regmap_write(lpc_snoop->regmap, HICR6, reg); - - /* Read and save most recent snoop'ed data byte to FIFO */ - regmap_read(lpc_snoop->regmap, SNPWDR, &data); - - if (reg & HICR6_STR_SNP0W) { - u8 val = (data & SNPWDR_CH0_MASK) >> SNPWDR_CH0_SHIFT; - - put_fifo_with_discard(&lpc_snoop->chan[0], val); - } - if (reg & HICR6_STR_SNP1W) { - u8 val = (data & SNPWDR_CH1_MASK) >> SNPWDR_CH1_SHIFT; - - put_fifo_with_discard(&lpc_snoop->chan[1], val); - } - - return IRQ_HANDLED; -} - -static int aspeed_lpc_snoop_config_irq(struct aspeed_lpc_snoop *lpc_snoop, - struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - int rc; - - lpc_snoop->irq = platform_get_irq(pdev, 0); - if (!lpc_snoop->irq) - return -ENODEV; - - rc = devm_request_irq(dev, lpc_snoop->irq, - aspeed_lpc_snoop_irq, IRQF_SHARED, - DEVICE_NAME, lpc_snoop); - if (rc < 0) { - dev_warn(dev, "Unable to request IRQ %d\n", lpc_snoop->irq); - lpc_snoop->irq = 0; - return rc; - } - - return 0; -} - -static int aspeed_lpc_enable_snoop(struct aspeed_lpc_snoop *lpc_snoop, - struct device *dev, - int channel, u16 lpc_port) -{ - int rc = 0; - u32 hicr5_en, snpwadr_mask, snpwadr_shift, hicrb_en; - const struct aspeed_lpc_snoop_model_data *model_data = - of_device_get_match_data(dev); - - init_waitqueue_head(&lpc_snoop->chan[channel].wq); - /* Create FIFO datastructure */ - rc = kfifo_alloc(&lpc_snoop->chan[channel].fifo, - SNOOP_FIFO_SIZE, GFP_KERNEL); - if (rc) - return rc; - - lpc_snoop->chan[channel].miscdev.minor = MISC_DYNAMIC_MINOR; - lpc_snoop->chan[channel].miscdev.name = - devm_kasprintf(dev, GFP_KERNEL, "%s%d", DEVICE_NAME, channel); - lpc_snoop->chan[channel].miscdev.fops = &snoop_fops; - lpc_snoop->chan[channel].miscdev.parent = dev; - rc = misc_register(&lpc_snoop->chan[channel].miscdev); - if (rc) - return rc; - - /* Enable LPC snoop channel at requested port */ - switch (channel) { - case 0: - hicr5_en = HICR5_EN_SNP0W | HICR5_ENINT_SNP0W; - snpwadr_mask = SNPWADR_CH0_MASK; - snpwadr_shift = SNPWADR_CH0_SHIFT; - hicrb_en = HICRB_ENSNP0D; - break; - case 1: - hicr5_en = HICR5_EN_SNP1W | HICR5_ENINT_SNP1W; - snpwadr_mask = SNPWADR_CH1_MASK; - snpwadr_shift = SNPWADR_CH1_SHIFT; - hicrb_en = HICRB_ENSNP1D; - break; - default: - return -EINVAL; - } - - regmap_update_bits(lpc_snoop->regmap, HICR5, hicr5_en, hicr5_en); - regmap_update_bits(lpc_snoop->regmap, SNPWADR, snpwadr_mask, - lpc_port << snpwadr_shift); - if (model_data->has_hicrb_ensnp) - regmap_update_bits(lpc_snoop->regmap, HICRB, - hicrb_en, hicrb_en); - - return rc; -} - -static void aspeed_lpc_disable_snoop(struct aspeed_lpc_snoop *lpc_snoop, - int channel) -{ - switch (channel) { - case 0: - regmap_update_bits(lpc_snoop->regmap, HICR5, - HICR5_EN_SNP0W | HICR5_ENINT_SNP0W, - 0); - break; - case 1: - regmap_update_bits(lpc_snoop->regmap, HICR5, - HICR5_EN_SNP1W | HICR5_ENINT_SNP1W, - 0); - break; - default: - return; - } - - kfifo_free(&lpc_snoop->chan[channel].fifo); - misc_deregister(&lpc_snoop->chan[channel].miscdev); -} - -static int aspeed_lpc_snoop_probe(struct platform_device *pdev) -{ - struct aspeed_lpc_snoop *lpc_snoop; - struct device *dev; - u32 port; - int rc; - - dev = &pdev->dev; - - lpc_snoop = devm_kzalloc(dev, sizeof(*lpc_snoop), GFP_KERNEL); - if (!lpc_snoop) - return -ENOMEM; - - lpc_snoop->regmap = syscon_node_to_regmap( - pdev->dev.parent->of_node); - if (IS_ERR(lpc_snoop->regmap)) { - dev_err(dev, "Couldn't get regmap\n"); - return -ENODEV; - } - - dev_set_drvdata(&pdev->dev, lpc_snoop); - - rc = of_property_read_u32_index(dev->of_node, "snoop-ports", 0, &port); - if (rc) { - dev_err(dev, "no snoop ports configured\n"); - return -ENODEV; - } - - rc = aspeed_lpc_snoop_config_irq(lpc_snoop, pdev); - if (rc) - return rc; - - rc = aspeed_lpc_enable_snoop(lpc_snoop, dev, 0, port); - if (rc) - return rc; - - /* Configuration of 2nd snoop channel port is optional */ - if (of_property_read_u32_index(dev->of_node, "snoop-ports", - 1, &port) == 0) { - rc = aspeed_lpc_enable_snoop(lpc_snoop, dev, 1, port); - if (rc) - aspeed_lpc_disable_snoop(lpc_snoop, 0); - } - - return rc; -} - -static int aspeed_lpc_snoop_remove(struct platform_device *pdev) -{ - struct aspeed_lpc_snoop *lpc_snoop = dev_get_drvdata(&pdev->dev); - - /* Disable both snoop channels */ - aspeed_lpc_disable_snoop(lpc_snoop, 0); - aspeed_lpc_disable_snoop(lpc_snoop, 1); - - return 0; -} - -static const struct aspeed_lpc_snoop_model_data ast2400_model_data = { - .has_hicrb_ensnp = 0, -}; - -static const struct aspeed_lpc_snoop_model_data ast2500_model_data = { - .has_hicrb_ensnp = 1, -}; - -static const struct of_device_id aspeed_lpc_snoop_match[] = { - { .compatible = "aspeed,ast2400-lpc-snoop", - .data = &ast2400_model_data }, - { .compatible = "aspeed,ast2500-lpc-snoop", - .data = &ast2500_model_data }, - { }, -}; - -static struct platform_driver aspeed_lpc_snoop_driver = { - .driver = { - .name = DEVICE_NAME, - .of_match_table = aspeed_lpc_snoop_match, - }, - .probe = aspeed_lpc_snoop_probe, - .remove = aspeed_lpc_snoop_remove, -}; - -module_platform_driver(aspeed_lpc_snoop_driver); - -MODULE_DEVICE_TABLE(of, aspeed_lpc_snoop_match); -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Robert Lippert <rlippert@google.com>"); -MODULE_DESCRIPTION("Linux driver to control Aspeed LPC snoop functionality"); diff --git a/drivers/misc/aspeed-p2a-ctrl.c b/drivers/misc/aspeed-p2a-ctrl.c deleted file mode 100644 index b60fbeaffcbd..000000000000 --- a/drivers/misc/aspeed-p2a-ctrl.c +++ /dev/null @@ -1,444 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * Copyright 2019 Google Inc - * - * 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. - * - * Provides a simple driver to control the ASPEED P2A interface which allows - * the host to read and write to various regions of the BMC's memory. - */ - -#include <linux/fs.h> -#include <linux/io.h> -#include <linux/mfd/syscon.h> -#include <linux/miscdevice.h> -#include <linux/mm.h> -#include <linux/module.h> -#include <linux/mutex.h> -#include <linux/of_address.h> -#include <linux/of_device.h> -#include <linux/platform_device.h> -#include <linux/regmap.h> -#include <linux/slab.h> -#include <linux/uaccess.h> - -#include <linux/aspeed-p2a-ctrl.h> - -#define DEVICE_NAME "aspeed-p2a-ctrl" - -/* SCU2C is a Misc. Control Register. */ -#define SCU2C 0x2c -/* SCU180 is the PCIe Configuration Setting Control Register. */ -#define SCU180 0x180 -/* Bit 1 controls the P2A bridge, while bit 0 controls the entire VGA device - * on the PCI bus. - */ -#define SCU180_ENP2A BIT(1) - -/* The ast2400/2500 both have six ranges. */ -#define P2A_REGION_COUNT 6 - -struct region { - u64 min; - u64 max; - u32 bit; -}; - -struct aspeed_p2a_model_data { - /* min, max, bit */ - struct region regions[P2A_REGION_COUNT]; -}; - -struct aspeed_p2a_ctrl { - struct miscdevice miscdev; - struct regmap *regmap; - - const struct aspeed_p2a_model_data *config; - - /* Access to these needs to be locked, held via probe, mapping ioctl, - * and release, remove. - */ - struct mutex tracking; - u32 readers; - u32 readerwriters[P2A_REGION_COUNT]; - - phys_addr_t mem_base; - resource_size_t mem_size; -}; - -struct aspeed_p2a_user { - struct file *file; - struct aspeed_p2a_ctrl *parent; - - /* The entire memory space is opened for reading once the bridge is - * enabled, therefore this needs only to be tracked once per user. - * If any user has it open for read, the bridge must stay enabled. - */ - u32 read; - - /* Each entry of the array corresponds to a P2A Region. If the user - * opens for read or readwrite, the reference goes up here. On - * release, this array is walked and references adjusted accordingly. - */ - u32 readwrite[P2A_REGION_COUNT]; -}; - -static void aspeed_p2a_enable_bridge(struct aspeed_p2a_ctrl *p2a_ctrl) -{ - regmap_update_bits(p2a_ctrl->regmap, - SCU180, SCU180_ENP2A, SCU180_ENP2A); -} - -static void aspeed_p2a_disable_bridge(struct aspeed_p2a_ctrl *p2a_ctrl) -{ - regmap_update_bits(p2a_ctrl->regmap, SCU180, SCU180_ENP2A, 0); -} - -static int aspeed_p2a_mmap(struct file *file, struct vm_area_struct *vma) -{ - unsigned long vsize; - pgprot_t prot; - struct aspeed_p2a_user *priv = file->private_data; - struct aspeed_p2a_ctrl *ctrl = priv->parent; - - if (ctrl->mem_base == 0 && ctrl->mem_size == 0) - return -EINVAL; - - vsize = vma->vm_end - vma->vm_start; - prot = vma->vm_page_prot; - - if (vma->vm_pgoff + vsize > ctrl->mem_base + 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, - (ctrl->mem_base >> PAGE_SHIFT) + vma->vm_pgoff, - vsize, prot)) - return -EAGAIN; - - return 0; -} - -static bool aspeed_p2a_region_acquire(struct aspeed_p2a_user *priv, - struct aspeed_p2a_ctrl *ctrl, - struct aspeed_p2a_ctrl_mapping *map) -{ - int i; - u64 base, end; - bool matched = false; - - base = map->addr; - end = map->addr + (map->length - 1); - - /* If the value is a legal u32, it will find a match. */ - for (i = 0; i < P2A_REGION_COUNT; i++) { - const struct region *curr = &ctrl->config->regions[i]; - - /* If the top of this region is lower than your base, skip it. - */ - if (curr->max < base) - continue; - - /* If the bottom of this region is higher than your end, bail. - */ - if (curr->min > end) - break; - - /* Lock this and update it, therefore it someone else is - * closing their file out, this'll preserve the increment. - */ - mutex_lock(&ctrl->tracking); - ctrl->readerwriters[i] += 1; - mutex_unlock(&ctrl->tracking); - - /* Track with the user, so when they close their file, we can - * decrement properly. - */ - priv->readwrite[i] += 1; - - /* Enable the region as read-write. */ - regmap_update_bits(ctrl->regmap, SCU2C, curr->bit, 0); - matched = true; - } - - return matched; -} - -static long aspeed_p2a_ioctl(struct file *file, unsigned int cmd, - unsigned long data) -{ - struct aspeed_p2a_user *priv = file->private_data; - struct aspeed_p2a_ctrl *ctrl = priv->parent; - void __user *arg = (void __user *)data; - struct aspeed_p2a_ctrl_mapping map; - - if (copy_from_user(&map, arg, sizeof(map))) - return -EFAULT; - - switch (cmd) { - case ASPEED_P2A_CTRL_IOCTL_SET_WINDOW: - /* If they want a region to be read-only, since the entire - * region is read-only once enabled, we just need to track this - * user wants to read from the bridge, and if it's not enabled. - * Enable it. - */ - if (map.flags == ASPEED_P2A_CTRL_READ_ONLY) { - mutex_lock(&ctrl->tracking); - ctrl->readers += 1; - mutex_unlock(&ctrl->tracking); - - /* Track with the user, so when they close their file, - * we can decrement properly. - */ - priv->read += 1; - } else if (map.flags == ASPEED_P2A_CTRL_READWRITE) { - /* If we don't acquire any region return error. */ - if (!aspeed_p2a_region_acquire(priv, ctrl, &map)) { - return -EINVAL; - } - } else { - /* Invalid map flags. */ - return -EINVAL; - } - - aspeed_p2a_enable_bridge(ctrl); - return 0; - case ASPEED_P2A_CTRL_IOCTL_GET_MEMORY_CONFIG: - /* This is a request for the memory-region and corresponding - * length that is used by the driver for mmap. - */ - - map.flags = 0; - map.addr = ctrl->mem_base; - map.length = ctrl->mem_size; - - return copy_to_user(arg, &map, sizeof(map)) ? -EFAULT : 0; - } - - return -EINVAL; -} - - -/* - * When a user opens this file, we create a structure to track their mappings. - * - * A user can map a region as read-only (bridge enabled), or read-write (bit - * flipped, and bridge enabled). Either way, this tracking is used, s.t. when - * they release the device references are handled. - * - * The bridge is not enabled until a user calls an ioctl to map a region, - * simply opening the device does not enable it. - */ -static int aspeed_p2a_open(struct inode *inode, struct file *file) -{ - struct aspeed_p2a_user *priv; - - priv = kmalloc(sizeof(*priv), GFP_KERNEL); - if (!priv) - return -ENOMEM; - - priv->file = file; - priv->read = 0; - memset(priv->readwrite, 0, sizeof(priv->readwrite)); - - /* The file's private_data is initialized to the p2a_ctrl. */ - priv->parent = file->private_data; - - /* Set the file's private_data to the user's data. */ - file->private_data = priv; - - return 0; -} - -/* - * This will close the users mappings. It will go through what they had opened - * for readwrite, and decrement those counts. If at the end, this is the last - * user, it'll close the bridge. - */ -static int aspeed_p2a_release(struct inode *inode, struct file *file) -{ - int i; - u32 bits = 0; - bool open_regions = false; - struct aspeed_p2a_user *priv = file->private_data; - - /* Lock others from changing these values until everything is updated - * in one pass. - */ - mutex_lock(&priv->parent->tracking); - - priv->parent->readers -= priv->read; - - for (i = 0; i < P2A_REGION_COUNT; i++) { - priv->parent->readerwriters[i] -= priv->readwrite[i]; - - if (priv->parent->readerwriters[i] > 0) - open_regions = true; - else - bits |= priv->parent->config->regions[i].bit; - } - - /* Setting a bit to 1 disables the region, so let's just OR with the - * above to disable any. - */ - - /* Note, if another user is trying to ioctl, they can't grab tracking, - * and therefore can't grab either register mutex. - * If another user is trying to close, they can't grab tracking either. - */ - regmap_update_bits(priv->parent->regmap, SCU2C, bits, bits); - - /* If parent->readers is zero and open windows is 0, disable the - * bridge. - */ - if (!open_regions && priv->parent->readers == 0) - aspeed_p2a_disable_bridge(priv->parent); - - mutex_unlock(&priv->parent->tracking); - - kfree(priv); - - return 0; -} - -static const struct file_operations aspeed_p2a_ctrl_fops = { - .owner = THIS_MODULE, - .mmap = aspeed_p2a_mmap, - .unlocked_ioctl = aspeed_p2a_ioctl, - .open = aspeed_p2a_open, - .release = aspeed_p2a_release, -}; - -/* The regions are controlled by SCU2C */ -static void aspeed_p2a_disable_all(struct aspeed_p2a_ctrl *p2a_ctrl) -{ - int i; - u32 value = 0; - - for (i = 0; i < P2A_REGION_COUNT; i++) - value |= p2a_ctrl->config->regions[i].bit; - - regmap_update_bits(p2a_ctrl->regmap, SCU2C, value, value); - - /* Disable the bridge. */ - aspeed_p2a_disable_bridge(p2a_ctrl); -} - -static int aspeed_p2a_ctrl_probe(struct platform_device *pdev) -{ - struct aspeed_p2a_ctrl *misc_ctrl; - struct device *dev; - struct resource resm; - struct device_node *node; - int rc = 0; - - dev = &pdev->dev; - - misc_ctrl = devm_kzalloc(dev, sizeof(*misc_ctrl), GFP_KERNEL); - if (!misc_ctrl) - return -ENOMEM; - - mutex_init(&misc_ctrl->tracking); - - /* optional. */ - node = of_parse_phandle(dev->of_node, "memory-region", 0); - if (node) { - 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 -ENODEV; - } - - misc_ctrl->mem_size = resource_size(&resm); - misc_ctrl->mem_base = resm.start; - } - - misc_ctrl->regmap = syscon_node_to_regmap(pdev->dev.parent->of_node); - if (IS_ERR(misc_ctrl->regmap)) { - dev_err(dev, "Couldn't get regmap\n"); - return -ENODEV; - } - - misc_ctrl->config = of_device_get_match_data(dev); - - dev_set_drvdata(&pdev->dev, misc_ctrl); - - aspeed_p2a_disable_all(misc_ctrl); - - misc_ctrl->miscdev.minor = MISC_DYNAMIC_MINOR; - misc_ctrl->miscdev.name = DEVICE_NAME; - misc_ctrl->miscdev.fops = &aspeed_p2a_ctrl_fops; - misc_ctrl->miscdev.parent = dev; - - rc = misc_register(&misc_ctrl->miscdev); - if (rc) - dev_err(dev, "Unable to register device\n"); - - return rc; -} - -static int aspeed_p2a_ctrl_remove(struct platform_device *pdev) -{ - struct aspeed_p2a_ctrl *p2a_ctrl = dev_get_drvdata(&pdev->dev); - - misc_deregister(&p2a_ctrl->miscdev); - - return 0; -} - -#define SCU2C_DRAM BIT(25) -#define SCU2C_SPI BIT(24) -#define SCU2C_SOC BIT(23) -#define SCU2C_FLASH BIT(22) - -static const struct aspeed_p2a_model_data ast2400_model_data = { - .regions = { - {0x00000000, 0x17FFFFFF, SCU2C_FLASH}, - {0x18000000, 0x1FFFFFFF, SCU2C_SOC}, - {0x20000000, 0x2FFFFFFF, SCU2C_FLASH}, - {0x30000000, 0x3FFFFFFF, SCU2C_SPI}, - {0x40000000, 0x5FFFFFFF, SCU2C_DRAM}, - {0x60000000, 0xFFFFFFFF, SCU2C_SOC}, - } -}; - -static const struct aspeed_p2a_model_data ast2500_model_data = { - .regions = { - {0x00000000, 0x0FFFFFFF, SCU2C_FLASH}, - {0x10000000, 0x1FFFFFFF, SCU2C_SOC}, - {0x20000000, 0x3FFFFFFF, SCU2C_FLASH}, - {0x40000000, 0x5FFFFFFF, SCU2C_SOC}, - {0x60000000, 0x7FFFFFFF, SCU2C_SPI}, - {0x80000000, 0xFFFFFFFF, SCU2C_DRAM}, - } -}; - -static const struct of_device_id aspeed_p2a_ctrl_match[] = { - { .compatible = "aspeed,ast2400-p2a-ctrl", - .data = &ast2400_model_data }, - { .compatible = "aspeed,ast2500-p2a-ctrl", - .data = &ast2500_model_data }, - { }, -}; - -static struct platform_driver aspeed_p2a_ctrl_driver = { - .driver = { - .name = DEVICE_NAME, - .of_match_table = aspeed_p2a_ctrl_match, - }, - .probe = aspeed_p2a_ctrl_probe, - .remove = aspeed_p2a_ctrl_remove, -}; - -module_platform_driver(aspeed_p2a_ctrl_driver); - -MODULE_DEVICE_TABLE(of, aspeed_p2a_ctrl_match); -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Patrick Venture <venture@google.com>"); -MODULE_DESCRIPTION("Control for aspeed 2400/2500 P2A VGA HOST to BMC mappings"); |