diff options
Diffstat (limited to 'drivers/pnp/pnpbios/rsparser.c')
| -rw-r--r-- | drivers/pnp/pnpbios/rsparser.c | 810 |
1 files changed, 810 insertions, 0 deletions
diff --git a/drivers/pnp/pnpbios/rsparser.c b/drivers/pnp/pnpbios/rsparser.c new file mode 100644 index 0000000000..2f31b212b1 --- /dev/null +++ b/drivers/pnp/pnpbios/rsparser.c @@ -0,0 +1,810 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * rsparser.c - parses and encodes pnpbios resource data streams + */ + +#include <linux/ctype.h> +#include <linux/pnp.h> +#include <linux/string.h> + +#ifdef CONFIG_PCI +#include <linux/pci.h> +#else +inline void pcibios_penalize_isa_irq(int irq, int active) +{ +} +#endif /* CONFIG_PCI */ + +#include "../base.h" +#include "pnpbios.h" + +/* standard resource tags */ +#define SMALL_TAG_PNPVERNO 0x01 +#define SMALL_TAG_LOGDEVID 0x02 +#define SMALL_TAG_COMPATDEVID 0x03 +#define SMALL_TAG_IRQ 0x04 +#define SMALL_TAG_DMA 0x05 +#define SMALL_TAG_STARTDEP 0x06 +#define SMALL_TAG_ENDDEP 0x07 +#define SMALL_TAG_PORT 0x08 +#define SMALL_TAG_FIXEDPORT 0x09 +#define SMALL_TAG_VENDOR 0x0e +#define SMALL_TAG_END 0x0f +#define LARGE_TAG 0x80 +#define LARGE_TAG_MEM 0x81 +#define LARGE_TAG_ANSISTR 0x82 +#define LARGE_TAG_UNICODESTR 0x83 +#define LARGE_TAG_VENDOR 0x84 +#define LARGE_TAG_MEM32 0x85 +#define LARGE_TAG_FIXEDMEM32 0x86 + +/* + * Resource Data Stream Format: + * + * Allocated Resources (required) + * end tag -> + * Resource Configuration Options (optional) + * end tag -> + * Compitable Device IDs (optional) + * final end tag -> + */ + +/* + * Allocated Resources + */ + +static void pnpbios_parse_allocated_ioresource(struct pnp_dev *dev, + int start, int len) +{ + int flags = 0; + int end = start + len - 1; + + if (len <= 0 || end >= 0x10003) + flags |= IORESOURCE_DISABLED; + + pnp_add_io_resource(dev, start, end, flags); +} + +static void pnpbios_parse_allocated_memresource(struct pnp_dev *dev, + int start, int len) +{ + int flags = 0; + int end = start + len - 1; + + if (len <= 0) + flags |= IORESOURCE_DISABLED; + + pnp_add_mem_resource(dev, start, end, flags); +} + +static unsigned char *pnpbios_parse_allocated_resource_data(struct pnp_dev *dev, + unsigned char *p, + unsigned char *end) +{ + unsigned int len, tag; + int io, size, mask, i, flags; + + if (!p) + return NULL; + + pnp_dbg(&dev->dev, "parse allocated resources\n"); + + pnp_init_resources(dev); + + while ((char *)p < (char *)end) { + + /* determine the type of tag */ + if (p[0] & LARGE_TAG) { /* large tag */ + len = (p[2] << 8) | p[1]; + tag = p[0]; + } else { /* small tag */ + len = p[0] & 0x07; + tag = ((p[0] >> 3) & 0x0f); + } + + switch (tag) { + + case LARGE_TAG_MEM: + if (len != 9) + goto len_err; + io = *(short *)&p[4]; + size = *(short *)&p[10]; + pnpbios_parse_allocated_memresource(dev, io, size); + break; + + case LARGE_TAG_ANSISTR: + /* ignore this for now */ + break; + + case LARGE_TAG_VENDOR: + /* do nothing */ + break; + + case LARGE_TAG_MEM32: + if (len != 17) + goto len_err; + io = *(int *)&p[4]; + size = *(int *)&p[16]; + pnpbios_parse_allocated_memresource(dev, io, size); + break; + + case LARGE_TAG_FIXEDMEM32: + if (len != 9) + goto len_err; + io = *(int *)&p[4]; + size = *(int *)&p[8]; + pnpbios_parse_allocated_memresource(dev, io, size); + break; + + case SMALL_TAG_IRQ: + if (len < 2 || len > 3) + goto len_err; + flags = 0; + io = -1; + mask = p[1] + p[2] * 256; + for (i = 0; i < 16; i++, mask = mask >> 1) + if (mask & 0x01) + io = i; + if (io != -1) + pcibios_penalize_isa_irq(io, 1); + else + flags = IORESOURCE_DISABLED; + pnp_add_irq_resource(dev, io, flags); + break; + + case SMALL_TAG_DMA: + if (len != 2) + goto len_err; + flags = 0; + io = -1; + mask = p[1]; + for (i = 0; i < 8; i++, mask = mask >> 1) + if (mask & 0x01) + io = i; + if (io == -1) + flags = IORESOURCE_DISABLED; + pnp_add_dma_resource(dev, io, flags); + break; + + case SMALL_TAG_PORT: + if (len != 7) + goto len_err; + io = p[2] + p[3] * 256; + size = p[7]; + pnpbios_parse_allocated_ioresource(dev, io, size); + break; + + case SMALL_TAG_VENDOR: + /* do nothing */ + break; + + case SMALL_TAG_FIXEDPORT: + if (len != 3) + goto len_err; + io = p[1] + p[2] * 256; + size = p[3]; + pnpbios_parse_allocated_ioresource(dev, io, size); + break; + + case SMALL_TAG_END: + p = p + 2; + return (unsigned char *)p; + break; + + default: /* an unknown tag */ +len_err: + dev_err(&dev->dev, "unknown tag %#x length %d\n", + tag, len); + break; + } + + /* continue to the next tag */ + if (p[0] & LARGE_TAG) + p += len + 3; + else + p += len + 1; + } + + dev_err(&dev->dev, "no end tag in resource structure\n"); + + return NULL; +} + +/* + * Resource Configuration Options + */ + +static __init void pnpbios_parse_mem_option(struct pnp_dev *dev, + unsigned char *p, int size, + unsigned int option_flags) +{ + resource_size_t min, max, align, len; + unsigned char flags; + + min = ((p[5] << 8) | p[4]) << 8; + max = ((p[7] << 8) | p[6]) << 8; + align = (p[9] << 8) | p[8]; + len = ((p[11] << 8) | p[10]) << 8; + flags = p[3]; + pnp_register_mem_resource(dev, option_flags, min, max, align, len, + flags); +} + +static __init void pnpbios_parse_mem32_option(struct pnp_dev *dev, + unsigned char *p, int size, + unsigned int option_flags) +{ + resource_size_t min, max, align, len; + unsigned char flags; + + min = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4]; + max = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8]; + align = (p[15] << 24) | (p[14] << 16) | (p[13] << 8) | p[12]; + len = (p[19] << 24) | (p[18] << 16) | (p[17] << 8) | p[16]; + flags = p[3]; + pnp_register_mem_resource(dev, option_flags, min, max, align, len, + flags); +} + +static __init void pnpbios_parse_fixed_mem32_option(struct pnp_dev *dev, + unsigned char *p, int size, + unsigned int option_flags) +{ + resource_size_t base, len; + unsigned char flags; + + base = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4]; + len = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8]; + flags = p[3]; + pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags); +} + +static __init void pnpbios_parse_irq_option(struct pnp_dev *dev, + unsigned char *p, int size, + unsigned int option_flags) +{ + unsigned long bits; + pnp_irq_mask_t map; + unsigned char flags = IORESOURCE_IRQ_HIGHEDGE; + + bits = (p[2] << 8) | p[1]; + + bitmap_zero(map.bits, PNP_IRQ_NR); + bitmap_copy(map.bits, &bits, 16); + + if (size > 2) + flags = p[3]; + + pnp_register_irq_resource(dev, option_flags, &map, flags); +} + +static __init void pnpbios_parse_dma_option(struct pnp_dev *dev, + unsigned char *p, int size, + unsigned int option_flags) +{ + pnp_register_dma_resource(dev, option_flags, p[1], p[2]); +} + +static __init void pnpbios_parse_port_option(struct pnp_dev *dev, + unsigned char *p, int size, + unsigned int option_flags) +{ + resource_size_t min, max, align, len; + unsigned char flags; + + min = (p[3] << 8) | p[2]; + max = (p[5] << 8) | p[4]; + align = p[6]; + len = p[7]; + flags = p[1] ? IORESOURCE_IO_16BIT_ADDR : 0; + pnp_register_port_resource(dev, option_flags, min, max, align, len, + flags); +} + +static __init void pnpbios_parse_fixed_port_option(struct pnp_dev *dev, + unsigned char *p, int size, + unsigned int option_flags) +{ + resource_size_t base, len; + + base = (p[2] << 8) | p[1]; + len = p[3]; + pnp_register_port_resource(dev, option_flags, base, base, 0, len, + IORESOURCE_IO_FIXED); +} + +static __init unsigned char * +pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end, + struct pnp_dev *dev) +{ + unsigned int len, tag; + int priority; + unsigned int option_flags; + + if (!p) + return NULL; + + pnp_dbg(&dev->dev, "parse resource options\n"); + option_flags = 0; + while ((char *)p < (char *)end) { + + /* determine the type of tag */ + if (p[0] & LARGE_TAG) { /* large tag */ + len = (p[2] << 8) | p[1]; + tag = p[0]; + } else { /* small tag */ + len = p[0] & 0x07; + tag = ((p[0] >> 3) & 0x0f); + } + + switch (tag) { + + case LARGE_TAG_MEM: + if (len != 9) + goto len_err; + pnpbios_parse_mem_option(dev, p, len, option_flags); + break; + + case LARGE_TAG_MEM32: + if (len != 17) + goto len_err; + pnpbios_parse_mem32_option(dev, p, len, option_flags); + break; + + case LARGE_TAG_FIXEDMEM32: + if (len != 9) + goto len_err; + pnpbios_parse_fixed_mem32_option(dev, p, len, + option_flags); + break; + + case SMALL_TAG_IRQ: + if (len < 2 || len > 3) + goto len_err; + pnpbios_parse_irq_option(dev, p, len, option_flags); + break; + + case SMALL_TAG_DMA: + if (len != 2) + goto len_err; + pnpbios_parse_dma_option(dev, p, len, option_flags); + break; + + case SMALL_TAG_PORT: + if (len != 7) + goto len_err; + pnpbios_parse_port_option(dev, p, len, option_flags); + break; + + case SMALL_TAG_VENDOR: + /* do nothing */ + break; + + case SMALL_TAG_FIXEDPORT: + if (len != 3) + goto len_err; + pnpbios_parse_fixed_port_option(dev, p, len, + option_flags); + break; + + case SMALL_TAG_STARTDEP: + if (len > 1) + goto len_err; + priority = PNP_RES_PRIORITY_ACCEPTABLE; + if (len > 0) + priority = p[1]; + option_flags = pnp_new_dependent_set(dev, priority); + break; + + case SMALL_TAG_ENDDEP: + if (len != 0) + goto len_err; + option_flags = 0; + break; + + case SMALL_TAG_END: + return p + 2; + + default: /* an unknown tag */ +len_err: + dev_err(&dev->dev, "unknown tag %#x length %d\n", + tag, len); + break; + } + + /* continue to the next tag */ + if (p[0] & LARGE_TAG) + p += len + 3; + else + p += len + 1; + } + + dev_err(&dev->dev, "no end tag in resource structure\n"); + + return NULL; +} + +/* + * Compatible Device IDs + */ + +static unsigned char *pnpbios_parse_compatible_ids(unsigned char *p, + unsigned char *end, + struct pnp_dev *dev) +{ + int len, tag; + u32 eisa_id; + char id[8]; + struct pnp_id *dev_id; + + if (!p) + return NULL; + + while ((char *)p < (char *)end) { + + /* determine the type of tag */ + if (p[0] & LARGE_TAG) { /* large tag */ + len = (p[2] << 8) | p[1]; + tag = p[0]; + } else { /* small tag */ + len = p[0] & 0x07; + tag = ((p[0] >> 3) & 0x0f); + } + + switch (tag) { + + case LARGE_TAG_ANSISTR: + strncpy(dev->name, p + 3, + len >= PNP_NAME_LEN ? PNP_NAME_LEN - 2 : len); + dev->name[len >= + PNP_NAME_LEN ? PNP_NAME_LEN - 1 : len] = '\0'; + break; + + case SMALL_TAG_COMPATDEVID: /* compatible ID */ + if (len != 4) + goto len_err; + eisa_id = p[1] | p[2] << 8 | p[3] << 16 | p[4] << 24; + pnp_eisa_id_to_string(eisa_id & PNP_EISA_ID_MASK, id); + dev_id = pnp_add_id(dev, id); + if (!dev_id) + return NULL; + break; + + case SMALL_TAG_END: + p = p + 2; + return (unsigned char *)p; + break; + + default: /* an unknown tag */ +len_err: + dev_err(&dev->dev, "unknown tag %#x length %d\n", + tag, len); + break; + } + + /* continue to the next tag */ + if (p[0] & LARGE_TAG) + p += len + 3; + else + p += len + 1; + } + + dev_err(&dev->dev, "no end tag in resource structure\n"); + + return NULL; +} + +/* + * Allocated Resource Encoding + */ + +static void pnpbios_encode_mem(struct pnp_dev *dev, unsigned char *p, + struct resource *res) +{ + unsigned long base; + unsigned long len; + + if (pnp_resource_enabled(res)) { + base = res->start; + len = resource_size(res); + } else { + base = 0; + len = 0; + } + + p[4] = (base >> 8) & 0xff; + p[5] = ((base >> 8) >> 8) & 0xff; + p[6] = (base >> 8) & 0xff; + p[7] = ((base >> 8) >> 8) & 0xff; + p[10] = (len >> 8) & 0xff; + p[11] = ((len >> 8) >> 8) & 0xff; + + pnp_dbg(&dev->dev, " encode mem %#lx-%#lx\n", base, base + len - 1); +} + +static void pnpbios_encode_mem32(struct pnp_dev *dev, unsigned char *p, + struct resource *res) +{ + unsigned long base; + unsigned long len; + + if (pnp_resource_enabled(res)) { + base = res->start; + len = resource_size(res); + } else { + base = 0; + len = 0; + } + + p[4] = base & 0xff; + p[5] = (base >> 8) & 0xff; + p[6] = (base >> 16) & 0xff; + p[7] = (base >> 24) & 0xff; + p[8] = base & 0xff; + p[9] = (base >> 8) & 0xff; + p[10] = (base >> 16) & 0xff; + p[11] = (base >> 24) & 0xff; + p[16] = len & 0xff; + p[17] = (len >> 8) & 0xff; + p[18] = (len >> 16) & 0xff; + p[19] = (len >> 24) & 0xff; + + pnp_dbg(&dev->dev, " encode mem32 %#lx-%#lx\n", base, base + len - 1); +} + +static void pnpbios_encode_fixed_mem32(struct pnp_dev *dev, unsigned char *p, + struct resource *res) +{ + unsigned long base; + unsigned long len; + + if (pnp_resource_enabled(res)) { + base = res->start; + len = resource_size(res); + } else { + base = 0; + len = 0; + } + + p[4] = base & 0xff; + p[5] = (base >> 8) & 0xff; + p[6] = (base >> 16) & 0xff; + p[7] = (base >> 24) & 0xff; + p[8] = len & 0xff; + p[9] = (len >> 8) & 0xff; + p[10] = (len >> 16) & 0xff; + p[11] = (len >> 24) & 0xff; + + pnp_dbg(&dev->dev, " encode fixed_mem32 %#lx-%#lx\n", base, + base + len - 1); +} + +static void pnpbios_encode_irq(struct pnp_dev *dev, unsigned char *p, + struct resource *res) +{ + unsigned long map; + + if (pnp_resource_enabled(res)) + map = 1 << res->start; + else + map = 0; + + p[1] = map & 0xff; + p[2] = (map >> 8) & 0xff; + + pnp_dbg(&dev->dev, " encode irq mask %#lx\n", map); +} + +static void pnpbios_encode_dma(struct pnp_dev *dev, unsigned char *p, + struct resource *res) +{ + unsigned long map; + + if (pnp_resource_enabled(res)) + map = 1 << res->start; + else + map = 0; + + p[1] = map & 0xff; + + pnp_dbg(&dev->dev, " encode dma mask %#lx\n", map); +} + +static void pnpbios_encode_port(struct pnp_dev *dev, unsigned char *p, + struct resource *res) +{ + unsigned long base; + unsigned long len; + + if (pnp_resource_enabled(res)) { + base = res->start; + len = resource_size(res); + } else { + base = 0; + len = 0; + } + + p[2] = base & 0xff; + p[3] = (base >> 8) & 0xff; + p[4] = base & 0xff; + p[5] = (base >> 8) & 0xff; + p[7] = len & 0xff; + + pnp_dbg(&dev->dev, " encode io %#lx-%#lx\n", base, base + len - 1); +} + +static void pnpbios_encode_fixed_port(struct pnp_dev *dev, unsigned char *p, + struct resource *res) +{ + unsigned long base = res->start; + unsigned long len = resource_size(res); + + if (pnp_resource_enabled(res)) { + base = res->start; + len = resource_size(res); + } else { + base = 0; + len = 0; + } + + p[1] = base & 0xff; + p[2] = (base >> 8) & 0xff; + p[3] = len & 0xff; + + pnp_dbg(&dev->dev, " encode fixed_io %#lx-%#lx\n", base, + base + len - 1); +} + +static unsigned char *pnpbios_encode_allocated_resource_data(struct pnp_dev + *dev, + unsigned char *p, + unsigned char *end) +{ + unsigned int len, tag; + int port = 0, irq = 0, dma = 0, mem = 0; + + if (!p) + return NULL; + + while ((char *)p < (char *)end) { + + /* determine the type of tag */ + if (p[0] & LARGE_TAG) { /* large tag */ + len = (p[2] << 8) | p[1]; + tag = p[0]; + } else { /* small tag */ + len = p[0] & 0x07; + tag = ((p[0] >> 3) & 0x0f); + } + + switch (tag) { + + case LARGE_TAG_MEM: + if (len != 9) + goto len_err; + pnpbios_encode_mem(dev, p, + pnp_get_resource(dev, IORESOURCE_MEM, mem)); + mem++; + break; + + case LARGE_TAG_MEM32: + if (len != 17) + goto len_err; + pnpbios_encode_mem32(dev, p, + pnp_get_resource(dev, IORESOURCE_MEM, mem)); + mem++; + break; + + case LARGE_TAG_FIXEDMEM32: + if (len != 9) + goto len_err; + pnpbios_encode_fixed_mem32(dev, p, + pnp_get_resource(dev, IORESOURCE_MEM, mem)); + mem++; + break; + + case SMALL_TAG_IRQ: + if (len < 2 || len > 3) + goto len_err; + pnpbios_encode_irq(dev, p, + pnp_get_resource(dev, IORESOURCE_IRQ, irq)); + irq++; + break; + + case SMALL_TAG_DMA: + if (len != 2) + goto len_err; + pnpbios_encode_dma(dev, p, + pnp_get_resource(dev, IORESOURCE_DMA, dma)); + dma++; + break; + + case SMALL_TAG_PORT: + if (len != 7) + goto len_err; + pnpbios_encode_port(dev, p, + pnp_get_resource(dev, IORESOURCE_IO, port)); + port++; + break; + + case SMALL_TAG_VENDOR: + /* do nothing */ + break; + + case SMALL_TAG_FIXEDPORT: + if (len != 3) + goto len_err; + pnpbios_encode_fixed_port(dev, p, + pnp_get_resource(dev, IORESOURCE_IO, port)); + port++; + break; + + case SMALL_TAG_END: + p = p + 2; + return (unsigned char *)p; + break; + + default: /* an unknown tag */ +len_err: + dev_err(&dev->dev, "unknown tag %#x length %d\n", + tag, len); + break; + } + + /* continue to the next tag */ + if (p[0] & LARGE_TAG) + p += len + 3; + else + p += len + 1; + } + + dev_err(&dev->dev, "no end tag in resource structure\n"); + + return NULL; +} + +/* + * Core Parsing Functions + */ + +int __init pnpbios_parse_data_stream(struct pnp_dev *dev, + struct pnp_bios_node *node) +{ + unsigned char *p = (char *)node->data; + unsigned char *end = (char *)(node->data + node->size); + + p = pnpbios_parse_allocated_resource_data(dev, p, end); + if (!p) + return -EIO; + p = pnpbios_parse_resource_option_data(p, end, dev); + if (!p) + return -EIO; + p = pnpbios_parse_compatible_ids(p, end, dev); + if (!p) + return -EIO; + return 0; +} + +int pnpbios_read_resources_from_node(struct pnp_dev *dev, + struct pnp_bios_node *node) +{ + unsigned char *p = (char *)node->data; + unsigned char *end = (char *)(node->data + node->size); + + p = pnpbios_parse_allocated_resource_data(dev, p, end); + if (!p) + return -EIO; + return 0; +} + +int pnpbios_write_resources_to_node(struct pnp_dev *dev, + struct pnp_bios_node *node) +{ + unsigned char *p = (char *)node->data; + unsigned char *end = (char *)(node->data + node->size); + + p = pnpbios_encode_allocated_resource_data(dev, p, end); + if (!p) + return -EIO; + return 0; +} |