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Subject[PATCH] pnp - Unified Resource Parsing (3/13)
This patch moves the resource parsing functions from the pnpbios protocol to a
new separate file. It contains many changes and improvements to these functions
including better error checking and manual setting of resource capabilities.
These functions can be used by anything that complies with the standard PnP
resource structure including ACPI.

Please apply,
Adam

diff -urN a/drivers/pnp/support.c b/drivers/pnp/support.c
--- a/drivers/pnp/support.c Thu Jan 1 00:00:00 1970
+++ b/drivers/pnp/support.c Mon Feb 3 15:49:22 2003
@@ -0,0 +1,666 @@
+/*
+ * support.c - provides standard pnp functions for the use of pnp protocol drivers,
+ *
+ * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
+ *
+ * Resource parsing functions are based on those in the linux pnpbios driver.
+ * Copyright Christian Schmidt, Tom Lees, David Hinds, Alan Cox, Thomas Hood,
+ * Brian Gerst and Adam Belay.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#ifdef CONFIG_PNP_DEBUG
+ #define DEBUG
+#else
+ #undef DEBUG
+#endif
+
+#include <linux/pnp.h>
+#include "base.h"
+
+#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 0x01
+#define LARGE_TAG_ANSISTR 0x02
+#define LARGE_TAG_UNICODESTR 0x03
+#define LARGE_TAG_VENDOR 0x04
+#define LARGE_TAG_MEM32 0x05
+#define LARGE_TAG_FIXEDMEM32 0x06
+
+
+/**
+ * pnp_is_active - Determines if a device is active based on its current resources
+ * @dev: pointer to the desired PnP device
+ *
+ */
+
+int pnp_is_active(struct pnp_dev * dev)
+{
+ if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
+ !pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
+ pnp_irq(dev, 0) == -1 &&
+ pnp_dma(dev, 0) == -1)
+ return 0;
+ else
+ return 1;
+}
+
+
+/*
+ * Current resource reading functions *
+ */
+
+static void current_irqresource(struct pnp_resource_table * res, int irq)
+{
+ int i = 0;
+ while ((res->irq_resource[i].flags & IORESOURCE_IRQ) && i < PNP_MAX_IRQ) i++;
+ if (i < PNP_MAX_IRQ) {
+ res->irq_resource[i].start =
+ res->irq_resource[i].end = (unsigned long) irq;
+ res->irq_resource[i].flags = IORESOURCE_IRQ; // Also clears _UNSET flag
+ }
+}
+
+static void current_dmaresource(struct pnp_resource_table * res, int dma)
+{
+ int i = 0;
+ while ((res->dma_resource[i].flags & IORESOURCE_DMA) && i < PNP_MAX_DMA) i++;
+ if (i < PNP_MAX_DMA) {
+ res->dma_resource[i].start =
+ res->dma_resource[i].end = (unsigned long) dma;
+ res->dma_resource[i].flags = IORESOURCE_DMA; // Also clears _UNSET flag
+ }
+}
+
+static void current_ioresource(struct pnp_resource_table * res, int io, int len)
+{
+ int i = 0;
+ while ((res->port_resource[i].flags & IORESOURCE_IO) && i < PNP_MAX_PORT) i++;
+ if (i < PNP_MAX_PORT) {
+ res->port_resource[i].start = (unsigned long) io;
+ res->port_resource[i].end = (unsigned long)(io + len - 1);
+ res->port_resource[i].flags = IORESOURCE_IO; // Also clears _UNSET flag
+ }
+}
+
+static void current_memresource(struct pnp_resource_table * res, int mem, int len)
+{
+ int i = 0;
+ while ((res->mem_resource[i].flags & IORESOURCE_MEM) && i < PNP_MAX_MEM) i++;
+ if (i < PNP_MAX_MEM) {
+ res->mem_resource[i].start = (unsigned long) mem;
+ res->mem_resource[i].end = (unsigned long)(mem + len - 1);
+ res->mem_resource[i].flags = IORESOURCE_MEM; // Also clears _UNSET flag
+ }
+}
+
+/**
+ * pnp_parse_current_resources - Extracts current resource information from a raw PnP resource structure
+ * @p: pointer to the start of the structure
+ * @end: pointer to the end of the structure
+ * @res: pointer to the resource table to record to
+ *
+ */
+
+unsigned char * pnp_parse_current_resources(unsigned char * p, unsigned char * end, struct pnp_resource_table * res)
+{
+ int len;
+
+ if (!p)
+ return NULL;
+
+ /* Blank the resource table values */
+ pnp_init_resource_table(res);
+
+ while ((char *)p < (char *)end) {
+
+ if(p[0] & LARGE_TAG) { /* large tag */
+ len = (p[2] << 8) | p[1];
+ switch (p[0] & 0x7f) {
+ case LARGE_TAG_MEM:
+ {
+ int io = *(short *) &p[4];
+ int size = *(short *) &p[10];
+ if (len != 9)
+ goto lrg_err;
+ current_memresource(res, io, size);
+ break;
+ }
+ case LARGE_TAG_ANSISTR:
+ {
+ /* ignore this for now */
+ break;
+ }
+ case LARGE_TAG_MEM32:
+ {
+ int io = *(int *) &p[4];
+ int size = *(int *) &p[16];
+ if (len != 17)
+ goto lrg_err;
+ current_memresource(res, io, size);
+ break;
+ }
+ case LARGE_TAG_FIXEDMEM32:
+ {
+ int io = *(int *) &p[4];
+ int size = *(int *) &p[8];
+ if (len != 9)
+ goto lrg_err;
+ current_memresource(res, io, size);
+ break;
+ }
+ default: /* an unkown tag */
+ {
+ lrg_err:
+ pnp_warn("parser: Unknown large tag '0x%x'.", p[0] & 0x7f);
+ break;
+ }
+ } /* switch */
+ p += len + 3;
+ continue;
+ } /* end large tag */
+
+ /* small tag */
+ len = p[0] & 0x07;
+ switch ((p[0]>>3) & 0x0f) {
+ case SMALL_TAG_IRQ:
+ {
+ int i, mask, irq = -1;
+ if (len < 2 || len > 3)
+ goto sm_err;
+ mask= p[1] + p[2]*256;
+ for (i=0;i<16;i++, mask=mask>>1)
+ if(mask & 0x01) irq=i;
+ current_irqresource(res, irq);
+ break;
+ }
+ case SMALL_TAG_DMA:
+ {
+ int i, mask, dma = -1;
+ if (len != 2)
+ goto sm_err;
+ mask = p[1];
+ for (i=0;i<8;i++, mask = mask>>1)
+ if(mask & 0x01) dma=i;
+ current_dmaresource(res, dma);
+ break;
+ }
+ case SMALL_TAG_PORT:
+ {
+ int io= p[2] + p[3] *256;
+ int size = p[7];
+ if (len != 7)
+ goto sm_err;
+ current_ioresource(res, io, size);
+ break;
+ }
+ case SMALL_TAG_FIXEDPORT:
+ {
+ int io = p[1] + p[2] * 256;
+ int size = p[3];
+ if (len != 3)
+ goto sm_err;
+ current_ioresource(res, io, size);
+ break;
+ }
+ case SMALL_TAG_END:
+ {
+ p = p + 2;
+ return (unsigned char *)p;
+ break;
+ }
+ default: /* an unkown tag */
+ {
+ sm_err:
+ pnp_warn("parser: Unknown small tag '0x%x'.", p[0]>>3);
+ break;
+ }
+ }
+ p += len + 1;
+ }
+ pnp_err("parser: Resource structure does not contain an end tag.");
+
+ return NULL;
+}
+
+
+/*
+ * Possible resource reading functions *
+ */
+
+static void possible_mem(unsigned char *p, int size, int depnum, struct pnp_dev *dev)
+{
+ struct pnp_mem * mem;
+ mem = pnp_alloc(sizeof(struct pnp_mem));
+ if (!mem)
+ return;
+ mem->min = ((p[3] << 8) | p[2]) << 8;
+ mem->max = ((p[5] << 8) | p[4]) << 8;
+ mem->align = (p[7] << 8) | p[6];
+ mem->size = ((p[9] << 8) | p[8]) << 8;
+ mem->flags = p[1];
+ pnp_add_mem_resource(dev,depnum,mem);
+ return;
+}
+
+static void possible_mem32(unsigned char *p, int size, int depnum, struct pnp_dev *dev)
+{
+ struct pnp_mem * mem;
+ mem = pnp_alloc(sizeof(struct pnp_mem));
+ if (!mem)
+ return;
+ mem->min = (p[5] << 24) | (p[4] << 16) | (p[3] << 8) | p[2];
+ mem->max = (p[9] << 24) | (p[8] << 16) | (p[7] << 8) | p[6];
+ mem->align = (p[13] << 24) | (p[12] << 16) | (p[11] << 8) | p[10];
+ mem->size = (p[17] << 24) | (p[16] << 16) | (p[15] << 8) | p[14];
+ mem->flags = p[1];
+ pnp_add_mem_resource(dev,depnum,mem);
+ return;
+}
+
+static void possible_fixed_mem32(unsigned char *p, int size, int depnum, struct pnp_dev *dev)
+{
+ struct pnp_mem * mem;
+ mem = pnp_alloc(sizeof(struct pnp_mem));
+ if (!mem)
+ return;
+ mem->min = mem->max = (p[5] << 24) | (p[4] << 16) | (p[3] << 8) | p[2];
+ mem->size = (p[9] << 24) | (p[8] << 16) | (p[7] << 8) | p[6];
+ mem->align = 0;
+ mem->flags = p[1];
+ pnp_add_mem_resource(dev,depnum,mem);
+ return;
+}
+
+static void possible_irq(unsigned char *p, int size, int depnum, struct pnp_dev *dev)
+{
+ struct pnp_irq * irq;
+ irq = pnp_alloc(sizeof(struct pnp_irq));
+ if (!irq)
+ return;
+ irq->map = (p[2] << 8) | p[1];
+ if (size > 2)
+ irq->flags = p[3];
+ pnp_add_irq_resource(dev,depnum,irq);
+ return;
+}
+
+static void possible_dma(unsigned char *p, int size, int depnum, struct pnp_dev *dev)
+{
+ struct pnp_dma * dma;
+ dma = pnp_alloc(sizeof(struct pnp_dma));
+ if (!dma)
+ return;
+ dma->map = p[1];
+ dma->flags = p[2];
+ pnp_add_dma_resource(dev,depnum,dma);
+ return;
+}
+
+static void possible_port(unsigned char *p, int size, int depnum, struct pnp_dev *dev)
+{
+ struct pnp_port * port;
+ port = pnp_alloc(sizeof(struct pnp_port));
+ if (!port)
+ return;
+ port->min = (p[3] << 8) | p[2];
+ port->max = (p[5] << 8) | p[4];
+ port->align = p[6];
+ port->size = p[7];
+ port->flags = p[1] ? PNP_PORT_FLAG_16BITADDR : 0;
+ pnp_add_port_resource(dev,depnum,port);
+ return;
+}
+
+static void possible_fixed_port(unsigned char *p, int size, int depnum, struct pnp_dev *dev)
+{
+ struct pnp_port * port;
+ port = pnp_alloc(sizeof(struct pnp_port));
+ if (!port)
+ return;
+ port->min = port->max = (p[2] << 8) | p[1];
+ port->size = p[3];
+ port->align = 0;
+ port->flags = PNP_PORT_FLAG_FIXED;
+ pnp_add_port_resource(dev,depnum,port);
+ return;
+}
+
+/**
+ * pnp_parse_possible_resources - Extracts possible resource information from a raw PnP resource structure
+ * @p: pointer to the start of the structure
+ * @end: pointer to the end of the structure
+ * @dev: pointer to the desired PnP device
+ *
+ */
+
+unsigned char * pnp_parse_possible_resources(unsigned char * p, unsigned char * end, struct pnp_dev *dev)
+{
+ int len, depnum = 0, dependent = 0;
+
+ if (!p)
+ return NULL;
+
+ if (pnp_build_resource(dev, 0) == NULL)
+ return NULL;
+
+ while ((char *)p < (char *)end) {
+
+ if(p[0] & LARGE_TAG) { /* large tag */
+ len = (p[2] << 8) | p[1];
+ switch (p[0] & 0x7f) {
+ case LARGE_TAG_MEM:
+ {
+ if (len != 9)
+ goto lrg_err;
+ possible_mem(p,len,depnum,dev);
+ break;
+ }
+ case LARGE_TAG_MEM32:
+ {
+ if (len != 17)
+ goto lrg_err;
+ possible_mem32(p,len,depnum,dev);
+ break;
+ }
+ case LARGE_TAG_FIXEDMEM32:
+ {
+ if (len != 9)
+ goto lrg_err;
+ possible_fixed_mem32(p,len,depnum,dev);
+ break;
+ }
+ default: /* an unkown tag */
+ {
+ lrg_err:
+ pnp_warn("parser: Unknown large tag '0x%x'.", p[0] & 0x7f);
+ break;
+ }
+ } /* switch */
+ p += len + 3;
+ continue;
+ } /* end large tag */
+
+ /* small tag */
+ len = p[0] & 0x07;
+ switch ((p[0]>>3) & 0x0f) {
+ case SMALL_TAG_IRQ:
+ {
+ if (len < 2 || len > 3)
+ goto sm_err;
+ possible_irq(p,len,depnum,dev);
+ break;
+ }
+ case SMALL_TAG_DMA:
+ {
+ if (len != 2)
+ goto sm_err;
+ possible_dma(p,len,depnum,dev);
+ break;
+ }
+ case SMALL_TAG_STARTDEP:
+ {
+ if (len > 1)
+ goto sm_err;
+ dependent = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
+ if (len > 0)
+ dependent = 0x100 | p[1];
+ pnp_build_resource(dev,dependent);
+ depnum = pnp_get_max_depnum(dev);
+ break;
+ }
+ case SMALL_TAG_ENDDEP:
+ {
+ if (len != 0)
+ goto sm_err;
+ depnum = 0;
+ break;
+ }
+ case SMALL_TAG_PORT:
+ {
+ if (len != 7)
+ goto sm_err;
+ possible_port(p,len,depnum,dev);
+ break;
+ }
+ case SMALL_TAG_FIXEDPORT:
+ {
+ if (len != 3)
+ goto sm_err;
+ possible_fixed_port(p,len,depnum,dev);
+ break;
+ }
+ case SMALL_TAG_END:
+ {
+ p = p + 2;
+ return (unsigned char *)p;
+ break;
+ }
+ default: /* an unkown tag */
+ {
+ sm_err:
+ pnp_warn("parser: Unknown small tag '0x%x'.", p[0]>>3);
+ break;
+ }
+ }
+ p += len + 1;
+ }
+ pnp_err("parser: Resource structure does not contain an end tag.");
+
+ return NULL;
+}
+
+
+/*
+ * Resource Writing functions
+ */
+
+static void write_mem(unsigned char *p, struct resource * res)
+{
+ unsigned long base = res->start;
+ unsigned long len = res->end - res->start + 1;
+ p[2] = (base >> 8) & 0xff;
+ p[3] = ((base >> 8) >> 8) & 0xff;
+ p[4] = (base >> 8) & 0xff;
+ p[5] = ((base >> 8) >> 8) & 0xff;
+ p[8] = (len >> 8) & 0xff;
+ p[9] = ((len >> 8) >> 8) & 0xff;
+ return;
+}
+
+static void write_mem32(unsigned char *p, struct resource * res)
+{
+ unsigned long base = res->start;
+ unsigned long len = res->end - res->start + 1;
+ p[2] = base & 0xff;
+ p[3] = (base >> 8) & 0xff;
+ p[4] = (base >> 16) & 0xff;
+ p[5] = (base >> 24) & 0xff;
+ p[6] = base & 0xff;
+ p[7] = (base >> 8) & 0xff;
+ p[8] = (base >> 16) & 0xff;
+ p[9] = (base >> 24) & 0xff;
+ p[14] = len & 0xff;
+ p[15] = (len >> 8) & 0xff;
+ p[16] = (len >> 16) & 0xff;
+ p[17] = (len >> 24) & 0xff;
+ return;
+}
+
+static void write_fixed_mem32(unsigned char *p, struct resource * res)
+{ unsigned long base = res->start;
+ unsigned long len = res->end - res->start + 1;
+ p[2] = base & 0xff;
+ p[3] = (base >> 8) & 0xff;
+ p[4] = (base >> 16) & 0xff;
+ p[5] = (base >> 24) & 0xff;
+ p[6] = len & 0xff;
+ p[7] = (len >> 8) & 0xff;
+ p[8] = (len >> 16) & 0xff;
+ p[9] = (len >> 24) & 0xff;
+ return;
+}
+
+static void write_irq(unsigned char *p, struct resource * res)
+{
+ unsigned long map = 0;
+ map = 1 << res->start;
+ p[1] = map & 0xff;
+ p[2] = (map >> 8) & 0xff;
+ return;
+}
+
+static void write_dma(unsigned char *p, struct resource * res)
+{
+ unsigned long map = 0;
+ map = 1 << res->start;
+ p[1] = map & 0xff;
+ return;
+}
+
+static void write_port(unsigned char *p, struct resource * res)
+{
+ unsigned long base = res->start;
+ unsigned long len = res->end - res->start + 1;
+ p[2] = base & 0xff;
+ p[3] = (base >> 8) & 0xff;
+ p[4] = base & 0xff;
+ p[5] = (base >> 8) & 0xff;
+ p[7] = len & 0xff;
+ return;
+}
+
+static void write_fixed_port(unsigned char *p, struct resource * res)
+{
+ unsigned long base = res->start;
+ unsigned long len = res->end - res->start + 1;
+ p[1] = base & 0xff;
+ p[2] = (base >> 8) & 0xff;
+ p[3] = len & 0xff;
+ return;
+}
+
+/**
+ * pnp_write_resources - Writes resource information to a raw PnP resource structure
+ * @p: pointer to the start of the structure
+ * @end: pointer to the end of the structure
+ * @res: pointer to a resource table containing the resources to set
+ *
+ */
+
+unsigned char * pnp_write_resources(unsigned char * p, unsigned char * end, struct pnp_resource_table * res)
+{
+ int len, port = 0, irq = 0, dma = 0, mem = 0;
+
+ if (!p)
+ return NULL;
+
+ while ((char *)p < (char *)end) {
+
+ if(p[0] & LARGE_TAG) { /* large tag */
+ len = (p[2] << 8) | p[1];
+ switch (p[0] & 0x7f) {
+ case LARGE_TAG_MEM:
+ {
+ if (len != 9)
+ goto lrg_err;
+ write_mem(p, &res->mem_resource[mem]);
+ mem++;
+ break;
+ }
+ case LARGE_TAG_MEM32:
+ {
+ if (len != 17)
+ goto lrg_err;
+ write_mem32(p, &res->mem_resource[mem]);
+ break;
+ }
+ case LARGE_TAG_FIXEDMEM32:
+ {
+ if (len != 9)
+ goto lrg_err;
+ write_fixed_mem32(p, &res->mem_resource[mem]);
+ break;
+ }
+ default: /* an unkown tag */
+ {
+ lrg_err:
+ pnp_warn("parser: Unknown large tag '0x%x'.", p[0] & 0x7f);
+ break;
+ }
+ } /* switch */
+ p += len + 3;
+ continue;
+ } /* end large tag */
+
+ /* small tag */
+ len = p[0] & 0x07;
+ switch ((p[0]>>3) & 0x0f) {
+ case SMALL_TAG_IRQ:
+ {
+ if (len < 2 || len > 3)
+ goto sm_err;
+ write_irq(p, &res->irq_resource[irq]);
+ irq++;
+ break;
+ }
+ case SMALL_TAG_DMA:
+ {
+ if (len != 2)
+ goto sm_err;
+ write_dma(p, &res->dma_resource[irq]);
+ dma++;
+ break;
+ }
+ case SMALL_TAG_PORT:
+ {
+ if (len != 7)
+ goto sm_err;
+ write_port(p, &res->port_resource[port]);
+ port++;
+ break;
+ }
+ case SMALL_TAG_FIXEDPORT:
+ {
+ if (len != 3)
+ goto sm_err;
+ write_fixed_port(p, &res->port_resource[port]);
+ port++;
+ break;
+ }
+ case SMALL_TAG_END:
+ {
+ p = p + 2;
+ return (unsigned char *)p;
+ break;
+ }
+ default: /* an unkown tag */
+ {
+ sm_err:
+ pnp_warn("parser: Unknown small tag '0x%x'.", p[0]>>3);
+ break;
+ }
+ }
+ p += len + 1;
+ }
+ pnp_err("parser: Resource structure does not contain an end tag.");
+
+ return NULL;
+}
+
+EXPORT_SYMBOL(pnp_is_active);
+EXPORT_SYMBOL(pnp_parse_current_resources);
+EXPORT_SYMBOL(pnp_parse_possible_resources);
+EXPORT_SYMBOL(pnp_write_resources);
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