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path: root/drivers/net/wan/cycx_drv.c
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Diffstat (limited to 'drivers/net/wan/cycx_drv.c')
-rw-r--r--drivers/net/wan/cycx_drv.c586
1 files changed, 586 insertions, 0 deletions
diff --git a/drivers/net/wan/cycx_drv.c b/drivers/net/wan/cycx_drv.c
new file mode 100644
index 000000000000..6e74af62ca08
--- /dev/null
+++ b/drivers/net/wan/cycx_drv.c
@@ -0,0 +1,586 @@
+/*
+* cycx_drv.c Cyclom 2X Support Module.
+*
+* This module is a library of common hardware specific
+* functions used by the Cyclades Cyclom 2X sync card.
+*
+* Author: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+*
+* Copyright: (c) 1998-2003 Arnaldo Carvalho de Melo
+*
+* Based on sdladrv.c by Gene Kozin <genek@compuserve.com>
+*
+* 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.
+* ============================================================================
+* 1999/11/11 acme set_current_state(TASK_INTERRUPTIBLE), code
+* cleanup
+* 1999/11/08 acme init_cyc2x deleted, doing nothing
+* 1999/11/06 acme back to read[bw], write[bw] and memcpy_to and
+* fromio to use dpmbase ioremaped
+* 1999/10/26 acme use isa_read[bw], isa_write[bw] & isa_memcpy_to
+* & fromio
+* 1999/10/23 acme cleanup to only supports cyclom2x: all the other
+* boards are no longer manufactured by cyclades,
+* if someone wants to support them... be my guest!
+* 1999/05/28 acme cycx_intack & cycx_intde gone for good
+* 1999/05/18 acme lots of unlogged work, submitting to Linus...
+* 1999/01/03 acme more judicious use of data types
+* 1999/01/03 acme judicious use of data types :>
+* cycx_inten trying to reset pending interrupts
+* from cyclom 2x - I think this isn't the way to
+* go, but for now...
+* 1999/01/02 acme cycx_intack ok, I think there's nothing to do
+* to ack an int in cycx_drv.c, only handle it in
+* cyx_isr (or in the other protocols: cyp_isr,
+* cyf_isr, when they get implemented.
+* Dec 31, 1998 acme cycx_data_boot & cycx_code_boot fixed, crossing
+* fingers to see x25_configure in cycx_x25.c
+* work... :)
+* Dec 26, 1998 acme load implementation fixed, seems to work! :)
+* cycx_2x_dpmbase_options with all the possible
+* DPM addresses (20).
+* cycx_intr implemented (test this!)
+* general code cleanup
+* Dec 8, 1998 Ivan Passos Cyclom-2X firmware load implementation.
+* Aug 8, 1998 acme Initial version.
+*/
+
+#include <linux/init.h> /* __init */
+#include <linux/module.h>
+#include <linux/kernel.h> /* printk(), and other useful stuff */
+#include <linux/stddef.h> /* offsetof(), etc. */
+#include <linux/errno.h> /* return codes */
+#include <linux/sched.h> /* for jiffies, HZ, etc. */
+#include <linux/cycx_drv.h> /* API definitions */
+#include <linux/cycx_cfm.h> /* CYCX firmware module definitions */
+#include <linux/delay.h> /* udelay */
+#include <asm/io.h> /* read[wl], write[wl], ioremap, iounmap */
+
+#define MOD_VERSION 0
+#define MOD_RELEASE 6
+
+MODULE_AUTHOR("Arnaldo Carvalho de Melo");
+MODULE_DESCRIPTION("Cyclom 2x Sync Card Driver");
+MODULE_LICENSE("GPL");
+
+/* Hardware-specific functions */
+static int load_cyc2x(struct cycx_hw *hw, struct cycx_firmware *cfm, u32 len);
+static void cycx_bootcfg(struct cycx_hw *hw);
+
+static int reset_cyc2x(void __iomem *addr);
+static int detect_cyc2x(void __iomem *addr);
+
+/* Miscellaneous functions */
+static void delay_cycx(int sec);
+static int get_option_index(long *optlist, long optval);
+static u16 checksum(u8 *buf, u32 len);
+
+#define wait_cyc(addr) cycx_exec(addr + CMD_OFFSET)
+
+/* Global Data */
+
+/* private data */
+static char modname[] = "cycx_drv";
+static char fullname[] = "Cyclom 2X Support Module";
+static char copyright[] = "(c) 1998-2003 Arnaldo Carvalho de Melo "
+ "<acme@conectiva.com.br>";
+
+/* Hardware configuration options.
+ * These are arrays of configuration options used by verification routines.
+ * The first element of each array is its size (i.e. number of options).
+ */
+static long cyc2x_dpmbase_options[] = {
+ 20,
+ 0xA0000, 0xA4000, 0xA8000, 0xAC000, 0xB0000, 0xB4000, 0xB8000,
+ 0xBC000, 0xC0000, 0xC4000, 0xC8000, 0xCC000, 0xD0000, 0xD4000,
+ 0xD8000, 0xDC000, 0xE0000, 0xE4000, 0xE8000, 0xEC000
+};
+
+static long cycx_2x_irq_options[] = { 7, 3, 5, 9, 10, 11, 12, 15 };
+
+/* Kernel Loadable Module Entry Points */
+/* Module 'insert' entry point.
+ * o print announcement
+ * o initialize static data
+ *
+ * Return: 0 Ok
+ * < 0 error.
+ * Context: process */
+
+int __init cycx_drv_init(void)
+{
+ printk(KERN_INFO "%s v%u.%u %s\n", fullname, MOD_VERSION, MOD_RELEASE,
+ copyright);
+
+ return 0;
+}
+
+/* Module 'remove' entry point.
+ * o release all remaining system resources */
+void cycx_drv_cleanup(void)
+{
+}
+
+/* Kernel APIs */
+/* Set up adapter.
+ * o detect adapter type
+ * o verify hardware configuration options
+ * o check for hardware conflicts
+ * o set up adapter shared memory
+ * o test adapter memory
+ * o load firmware
+ * Return: 0 ok.
+ * < 0 error */
+EXPORT_SYMBOL(cycx_setup);
+int cycx_setup(struct cycx_hw *hw, void *cfm, u32 len, unsigned long dpmbase)
+{
+ int err;
+
+ /* Verify IRQ configuration options */
+ if (!get_option_index(cycx_2x_irq_options, hw->irq)) {
+ printk(KERN_ERR "%s: IRQ %d is invalid!\n", modname, hw->irq);
+ return -EINVAL;
+ }
+
+ /* Setup adapter dual-port memory window and test memory */
+ if (!dpmbase) {
+ printk(KERN_ERR "%s: you must specify the dpm address!\n",
+ modname);
+ return -EINVAL;
+ } else if (!get_option_index(cyc2x_dpmbase_options, dpmbase)) {
+ printk(KERN_ERR "%s: memory address 0x%lX is invalid!\n",
+ modname, dpmbase);
+ return -EINVAL;
+ }
+
+ hw->dpmbase = ioremap(dpmbase, CYCX_WINDOWSIZE);
+ hw->dpmsize = CYCX_WINDOWSIZE;
+
+ if (!detect_cyc2x(hw->dpmbase)) {
+ printk(KERN_ERR "%s: adapter Cyclom 2X not found at "
+ "address 0x%lX!\n", modname, dpmbase);
+ return -EINVAL;
+ }
+
+ printk(KERN_INFO "%s: found Cyclom 2X card at address 0x%lX.\n",
+ modname, dpmbase);
+
+ /* Load firmware. If loader fails then shut down adapter */
+ err = load_cyc2x(hw, cfm, len);
+
+ if (err)
+ cycx_down(hw); /* shutdown adapter */
+
+ return err;
+}
+
+EXPORT_SYMBOL(cycx_down);
+int cycx_down(struct cycx_hw *hw)
+{
+ iounmap(hw->dpmbase);
+ return 0;
+}
+
+/* Enable interrupt generation. */
+EXPORT_SYMBOL(cycx_inten);
+void cycx_inten(struct cycx_hw *hw)
+{
+ writeb(0, hw->dpmbase);
+}
+
+/* Generate an interrupt to adapter's CPU. */
+EXPORT_SYMBOL(cycx_intr);
+void cycx_intr(struct cycx_hw *hw)
+{
+ writew(0, hw->dpmbase + GEN_CYCX_INTR);
+}
+
+/* Execute Adapter Command.
+ * o Set exec flag.
+ * o Busy-wait until flag is reset. */
+EXPORT_SYMBOL(cycx_exec);
+int cycx_exec(void __iomem *addr)
+{
+ u16 i = 0;
+ /* wait till addr content is zeroed */
+
+ while (readw(addr)) {
+ udelay(1000);
+
+ if (++i > 50)
+ return -1;
+ }
+
+ return 0;
+}
+
+/* Read absolute adapter memory.
+ * Transfer data from adapter's memory to data buffer. */
+EXPORT_SYMBOL(cycx_peek);
+int cycx_peek(struct cycx_hw *hw, u32 addr, void *buf, u32 len)
+{
+ if (len == 1)
+ *(u8*)buf = readb(hw->dpmbase + addr);
+ else
+ memcpy_fromio(buf, hw->dpmbase + addr, len);
+
+ return 0;
+}
+
+/* Write Absolute Adapter Memory.
+ * Transfer data from data buffer to adapter's memory. */
+EXPORT_SYMBOL(cycx_poke);
+int cycx_poke(struct cycx_hw *hw, u32 addr, void *buf, u32 len)
+{
+ if (len == 1)
+ writeb(*(u8*)buf, hw->dpmbase + addr);
+ else
+ memcpy_toio(hw->dpmbase + addr, buf, len);
+
+ return 0;
+}
+
+/* Hardware-Specific Functions */
+
+/* Load Aux Routines */
+/* Reset board hardware.
+ return 1 if memory exists at addr and 0 if not. */
+static int memory_exists(void __iomem *addr)
+{
+ int tries = 0;
+
+ for (; tries < 3 ; tries++) {
+ writew(TEST_PATTERN, addr + 0x10);
+
+ if (readw(addr + 0x10) == TEST_PATTERN)
+ if (readw(addr + 0x10) == TEST_PATTERN)
+ return 1;
+
+ delay_cycx(1);
+ }
+
+ return 0;
+}
+
+/* Load reset code. */
+static void reset_load(void __iomem *addr, u8 *buffer, u32 cnt)
+{
+ void __iomem *pt_code = addr + RESET_OFFSET;
+ u16 i; /*, j; */
+
+ for (i = 0 ; i < cnt ; i++) {
+/* for (j = 0 ; j < 50 ; j++); Delay - FIXME busy waiting... */
+ writeb(*buffer++, pt_code++);
+ }
+}
+
+/* Load buffer using boot interface.
+ * o copy data from buffer to Cyclom-X memory
+ * o wait for reset code to copy it to right portion of memory */
+static int buffer_load(void __iomem *addr, u8 *buffer, u32 cnt)
+{
+ memcpy_toio(addr + DATA_OFFSET, buffer, cnt);
+ writew(GEN_BOOT_DAT, addr + CMD_OFFSET);
+
+ return wait_cyc(addr);
+}
+
+/* Set up entry point and kick start Cyclom-X CPU. */
+static void cycx_start(void __iomem *addr)
+{
+ /* put in 0x30 offset the jump instruction to the code entry point */
+ writeb(0xea, addr + 0x30);
+ writeb(0x00, addr + 0x31);
+ writeb(0xc4, addr + 0x32);
+ writeb(0x00, addr + 0x33);
+ writeb(0x00, addr + 0x34);
+
+ /* cmd to start executing code */
+ writew(GEN_START, addr + CMD_OFFSET);
+}
+
+/* Load and boot reset code. */
+static void cycx_reset_boot(void __iomem *addr, u8 *code, u32 len)
+{
+ void __iomem *pt_start = addr + START_OFFSET;
+
+ writeb(0xea, pt_start++); /* jmp to f000:3f00 */
+ writeb(0x00, pt_start++);
+ writeb(0xfc, pt_start++);
+ writeb(0x00, pt_start++);
+ writeb(0xf0, pt_start);
+ reset_load(addr, code, len);
+
+ /* 80186 was in hold, go */
+ writeb(0, addr + START_CPU);
+ delay_cycx(1);
+}
+
+/* Load data.bin file through boot (reset) interface. */
+static int cycx_data_boot(void __iomem *addr, u8 *code, u32 len)
+{
+ void __iomem *pt_boot_cmd = addr + CMD_OFFSET;
+ u32 i;
+
+ /* boot buffer lenght */
+ writew(CFM_LOAD_BUFSZ, pt_boot_cmd + sizeof(u16));
+ writew(GEN_DEFPAR, pt_boot_cmd);
+
+ if (wait_cyc(addr) < 0)
+ return -1;
+
+ writew(0, pt_boot_cmd + sizeof(u16));
+ writew(0x4000, pt_boot_cmd + 2 * sizeof(u16));
+ writew(GEN_SET_SEG, pt_boot_cmd);
+
+ if (wait_cyc(addr) < 0)
+ return -1;
+
+ for (i = 0 ; i < len ; i += CFM_LOAD_BUFSZ)
+ if (buffer_load(addr, code + i,
+ min_t(u32, CFM_LOAD_BUFSZ, (len - i))) < 0) {
+ printk(KERN_ERR "%s: Error !!\n", modname);
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/* Load code.bin file through boot (reset) interface. */
+static int cycx_code_boot(void __iomem *addr, u8 *code, u32 len)
+{
+ void __iomem *pt_boot_cmd = addr + CMD_OFFSET;
+ u32 i;
+
+ /* boot buffer lenght */
+ writew(CFM_LOAD_BUFSZ, pt_boot_cmd + sizeof(u16));
+ writew(GEN_DEFPAR, pt_boot_cmd);
+
+ if (wait_cyc(addr) < 0)
+ return -1;
+
+ writew(0x0000, pt_boot_cmd + sizeof(u16));
+ writew(0xc400, pt_boot_cmd + 2 * sizeof(u16));
+ writew(GEN_SET_SEG, pt_boot_cmd);
+
+ if (wait_cyc(addr) < 0)
+ return -1;
+
+ for (i = 0 ; i < len ; i += CFM_LOAD_BUFSZ)
+ if (buffer_load(addr, code + i,
+ min_t(u32, CFM_LOAD_BUFSZ, (len - i)))) {
+ printk(KERN_ERR "%s: Error !!\n", modname);
+ return -1;
+ }
+
+ return 0;
+}
+
+/* Load adapter from the memory image of the CYCX firmware module.
+ * o verify firmware integrity and compatibility
+ * o start adapter up */
+static int load_cyc2x(struct cycx_hw *hw, struct cycx_firmware *cfm, u32 len)
+{
+ int i, j;
+ struct cycx_fw_header *img_hdr;
+ u8 *reset_image,
+ *data_image,
+ *code_image;
+ void __iomem *pt_cycld = hw->dpmbase + 0x400;
+ u16 cksum;
+
+ /* Announce */
+ printk(KERN_INFO "%s: firmware signature=\"%s\"\n", modname,
+ cfm->signature);
+
+ /* Verify firmware signature */
+ if (strcmp(cfm->signature, CFM_SIGNATURE)) {
+ printk(KERN_ERR "%s:load_cyc2x: not Cyclom-2X firmware!\n",
+ modname);
+ return -EINVAL;
+ }
+
+ printk(KERN_INFO "%s: firmware version=%u\n", modname, cfm->version);
+
+ /* Verify firmware module format version */
+ if (cfm->version != CFM_VERSION) {
+ printk(KERN_ERR "%s:%s: firmware format %u rejected! "
+ "Expecting %u.\n",
+ modname, __FUNCTION__, cfm->version, CFM_VERSION);
+ return -EINVAL;
+ }
+
+ /* Verify firmware module length and checksum */
+ cksum = checksum((u8*)&cfm->info, sizeof(struct cycx_fw_info) +
+ cfm->info.codesize);
+/*
+ FIXME cfm->info.codesize is off by 2
+ if (((len - sizeof(struct cycx_firmware) - 1) != cfm->info.codesize) ||
+*/
+ if (cksum != cfm->checksum) {
+ printk(KERN_ERR "%s:%s: firmware corrupted!\n",
+ modname, __FUNCTION__);
+ printk(KERN_ERR " cdsize = 0x%x (expected 0x%lx)\n",
+ len - (int)sizeof(struct cycx_firmware) - 1,
+ cfm->info.codesize);
+ printk(KERN_ERR " chksum = 0x%x (expected 0x%x)\n",
+ cksum, cfm->checksum);
+ return -EINVAL;
+ }
+
+ /* If everything is ok, set reset, data and code pointers */
+ img_hdr = (struct cycx_fw_header *)&cfm->image;
+#ifdef FIRMWARE_DEBUG
+ printk(KERN_INFO "%s:%s: image sizes\n", __FUNCTION__, modname);
+ printk(KERN_INFO " reset=%lu\n", img_hdr->reset_size);
+ printk(KERN_INFO " data=%lu\n", img_hdr->data_size);
+ printk(KERN_INFO " code=%lu\n", img_hdr->code_size);
+#endif
+ reset_image = ((u8 *)img_hdr) + sizeof(struct cycx_fw_header);
+ data_image = reset_image + img_hdr->reset_size;
+ code_image = data_image + img_hdr->data_size;
+
+ /*---- Start load ----*/
+ /* Announce */
+ printk(KERN_INFO "%s: loading firmware %s (ID=%u)...\n", modname,
+ cfm->descr[0] ? cfm->descr : "unknown firmware",
+ cfm->info.codeid);
+
+ for (i = 0 ; i < 5 ; i++) {
+ /* Reset Cyclom hardware */
+ if (!reset_cyc2x(hw->dpmbase)) {
+ printk(KERN_ERR "%s: dpm problem or board not found\n",
+ modname);
+ return -EINVAL;
+ }
+
+ /* Load reset.bin */
+ cycx_reset_boot(hw->dpmbase, reset_image, img_hdr->reset_size);
+ /* reset is waiting for boot */
+ writew(GEN_POWER_ON, pt_cycld);
+ delay_cycx(1);
+
+ for (j = 0 ; j < 3 ; j++)
+ if (!readw(pt_cycld))
+ goto reset_loaded;
+ else
+ delay_cycx(1);
+ }
+
+ printk(KERN_ERR "%s: reset not started.\n", modname);
+ return -EINVAL;
+
+reset_loaded:
+ /* Load data.bin */
+ if (cycx_data_boot(hw->dpmbase, data_image, img_hdr->data_size)) {
+ printk(KERN_ERR "%s: cannot load data file.\n", modname);
+ return -EINVAL;
+ }
+
+ /* Load code.bin */
+ if (cycx_code_boot(hw->dpmbase, code_image, img_hdr->code_size)) {
+ printk(KERN_ERR "%s: cannot load code file.\n", modname);
+ return -EINVAL;
+ }
+
+ /* Prepare boot-time configuration data */
+ cycx_bootcfg(hw);
+
+ /* kick-off CPU */
+ cycx_start(hw->dpmbase);
+
+ /* Arthur Ganzert's tip: wait a while after the firmware loading...
+ seg abr 26 17:17:12 EST 1999 - acme */
+ delay_cycx(7);
+ printk(KERN_INFO "%s: firmware loaded!\n", modname);
+
+ /* enable interrupts */
+ cycx_inten(hw);
+
+ return 0;
+}
+
+/* Prepare boot-time firmware configuration data.
+ * o initialize configuration data area
+ From async.doc - V_3.4.0 - 07/18/1994
+ - As of now, only static buffers are available to the user.
+ So, the bit VD_RXDIRC must be set in 'valid'. That means that user
+ wants to use the static transmission and reception buffers. */
+static void cycx_bootcfg(struct cycx_hw *hw)
+{
+ /* use fixed buffers */
+ writeb(FIXED_BUFFERS, hw->dpmbase + CONF_OFFSET);
+}
+
+/* Detect Cyclom 2x adapter.
+ * Following tests are used to detect Cyclom 2x adapter:
+ * to be completed based on the tests done below
+ * Return 1 if detected o.k. or 0 if failed.
+ * Note: This test is destructive! Adapter will be left in shutdown
+ * state after the test. */
+static int detect_cyc2x(void __iomem *addr)
+{
+ reset_cyc2x(addr);
+
+ return memory_exists(addr);
+}
+
+/* Miscellaneous */
+/* Get option's index into the options list.
+ * Return option's index (1 .. N) or zero if option is invalid. */
+static int get_option_index(long *optlist, long optval)
+{
+ int i = 1;
+
+ for (; i <= optlist[0]; ++i)
+ if (optlist[i] == optval)
+ return i;
+
+ return 0;
+}
+
+/* Reset adapter's CPU. */
+static int reset_cyc2x(void __iomem *addr)
+{
+ writeb(0, addr + RST_ENABLE);
+ delay_cycx(2);
+ writeb(0, addr + RST_DISABLE);
+ delay_cycx(2);
+
+ return memory_exists(addr);
+}
+
+/* Delay */
+static void delay_cycx(int sec)
+{
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(sec * HZ);
+}
+
+/* Calculate 16-bit CRC using CCITT polynomial. */
+static u16 checksum(u8 *buf, u32 len)
+{
+ u16 crc = 0;
+ u16 mask, flag;
+
+ for (; len; --len, ++buf)
+ for (mask = 0x80; mask; mask >>= 1) {
+ flag = (crc & 0x8000);
+ crc <<= 1;
+ crc |= ((*buf & mask) ? 1 : 0);
+
+ if (flag)
+ crc ^= 0x1021;
+ }
+
+ return crc;
+}
+
+module_init(cycx_drv_init);
+module_exit(cycx_drv_cleanup);
+
+/* End */
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