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/*
* Firmware loader for ETRAX FS IO-Processor
*
* Copyright (C) 2004 Axis Communications AB
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <hwregs/reg_rdwr.h>
#include <hwregs/reg_map.h>
#include <hwregs/iop/iop_reg_space.h>
#include <hwregs/iop/iop_mpu_macros.h>
#include <hwregs/iop/iop_mpu_defs.h>
#include <hwregs/iop/iop_spu_defs.h>
#include <hwregs/iop/iop_sw_cpu_defs.h>
#define IOP_TIMEOUT 100
#error "This driver is broken with regard to its driver core usage."
#error "Please contact <greg@kroah.com> for details on how to fix it properly."
static struct device iop_spu_device[2] = {
{ .init_name = "iop-spu0", },
{ .init_name = "iop-spu1", },
};
static struct device iop_mpu_device = {
.init_name = "iop-mpu",
};
static int wait_mpu_idle(void)
{
reg_iop_mpu_r_stat mpu_stat;
unsigned int timeout = IOP_TIMEOUT;
do {
mpu_stat = REG_RD(iop_mpu, regi_iop_mpu, r_stat);
} while (mpu_stat.instr_reg_busy == regk_iop_mpu_yes && --timeout > 0);
if (timeout == 0) {
printk(KERN_ERR "Timeout waiting for MPU to be idle\n");
return -EBUSY;
}
return 0;
}
int iop_fw_load_spu(const unsigned char *fw_name, unsigned int spu_inst)
{
reg_iop_sw_cpu_rw_mc_ctrl mc_ctrl = {
.wr_spu0_mem = regk_iop_sw_cpu_no,
.wr_spu1_mem = regk_iop_sw_cpu_no,
.size = 4,
.cmd = regk_iop_sw_cpu_reg_copy,
.keep_owner = regk_iop_sw_cpu_yes
};
reg_iop_spu_rw_ctrl spu_ctrl = {
.en = regk_iop_spu_no,
.fsm = regk_iop_spu_no,
};
reg_iop_sw_cpu_r_mc_stat mc_stat;
const struct firmware *fw_entry;
u32 *data;
unsigned int timeout;
int retval, i;
if (spu_inst > 1)
return -ENODEV;
/* get firmware */
retval = request_firmware(&fw_entry,
fw_name,
&iop_spu_device[spu_inst]);
if (retval != 0)
{
printk(KERN_ERR
"iop_load_spu: Failed to load firmware \"%s\"\n",
fw_name);
return retval;
}
data = (u32 *) fw_entry->data;
/* acquire ownership of memory controller */
switch (spu_inst) {
case 0:
mc_ctrl.wr_spu0_mem = regk_iop_sw_cpu_yes;
REG_WR(iop_spu, regi_iop_spu0, rw_ctrl, spu_ctrl);
break;
case 1:
mc_ctrl.wr_spu1_mem = regk_iop_sw_cpu_yes;
REG_WR(iop_spu, regi_iop_spu1, rw_ctrl, spu_ctrl);
break;
}
timeout = IOP_TIMEOUT;
do {
REG_WR(iop_sw_cpu, regi_iop_sw_cpu, rw_mc_ctrl, mc_ctrl);
mc_stat = REG_RD(iop_sw_cpu, regi_iop_sw_cpu, r_mc_stat);
} while (mc_stat.owned_by_cpu == regk_iop_sw_cpu_no && --timeout > 0);
if (timeout == 0) {
printk(KERN_ERR "Timeout waiting to acquire MC\n");
retval = -EBUSY;
goto out;
}
/* write to SPU memory */
for (i = 0; i < (fw_entry->size/4); i++) {
switch (spu_inst) {
case 0:
REG_WR_INT(iop_spu, regi_iop_spu0, rw_seq_pc, (i*4));
break;
case 1:
REG_WR_INT(iop_spu, regi_iop_spu1, rw_seq_pc, (i*4));
break;
}
REG_WR_INT(iop_sw_cpu, regi_iop_sw_cpu, rw_mc_data, *data);
data++;
}
/* release ownership of memory controller */
(void) REG_RD(iop_sw_cpu, regi_iop_sw_cpu, rs_mc_data);
out:
release_firmware(fw_entry);
return retval;
}
int iop_fw_load_mpu(unsigned char *fw_name)
{
const unsigned int start_addr = 0;
reg_iop_mpu_rw_ctrl mpu_ctrl;
const struct firmware *fw_entry;
u32 *data;
int retval, i;
/* get firmware */
retval = request_firmware(&fw_entry, fw_name, &iop_mpu_device);
if (retval != 0)
{
printk(KERN_ERR
"iop_load_spu: Failed to load firmware \"%s\"\n",
fw_name);
return retval;
}
data = (u32 *) fw_entry->data;
/* disable MPU */
mpu_ctrl.en = regk_iop_mpu_no;
REG_WR(iop_mpu, regi_iop_mpu, rw_ctrl, mpu_ctrl);
/* put start address in R0 */
REG_WR_VECT(iop_mpu, regi_iop_mpu, rw_r, 0, start_addr);
/* write to memory by executing 'SWX i, 4, R0' for each word */
if ((retval = wait_mpu_idle()) != 0)
goto out;
REG_WR(iop_mpu, regi_iop_mpu, rw_instr, MPU_SWX_IIR_INSTR(0, 4, 0));
for (i = 0; i < (fw_entry->size / 4); i++) {
REG_WR_INT(iop_mpu, regi_iop_mpu, rw_immediate, *data);
if ((retval = wait_mpu_idle()) != 0)
goto out;
data++;
}
out:
release_firmware(fw_entry);
return retval;
}
int iop_start_mpu(unsigned int start_addr)
{
reg_iop_mpu_rw_ctrl mpu_ctrl = { .en = regk_iop_mpu_yes };
int retval;
/* disable MPU */
if ((retval = wait_mpu_idle()) != 0)
goto out;
REG_WR(iop_mpu, regi_iop_mpu, rw_instr, MPU_HALT());
if ((retval = wait_mpu_idle()) != 0)
goto out;
/* set PC and wait for it to bite */
if ((retval = wait_mpu_idle()) != 0)
goto out;
REG_WR_INT(iop_mpu, regi_iop_mpu, rw_instr, MPU_BA_I(start_addr));
if ((retval = wait_mpu_idle()) != 0)
goto out;
/* make sure the MPU starts executing with interrupts disabled */
REG_WR(iop_mpu, regi_iop_mpu, rw_instr, MPU_DI());
if ((retval = wait_mpu_idle()) != 0)
goto out;
/* enable MPU */
REG_WR(iop_mpu, regi_iop_mpu, rw_ctrl, mpu_ctrl);
out:
return retval;
}
static int __init iop_fw_load_init(void)
{
#if 0
/*
* static struct devices can not be added directly to sysfs by ignoring
* the driver model infrastructure. To fix this properly, please use
* the platform_bus to register these devices to be able to properly
* use the firmware infrastructure.
*/
device_initialize(&iop_spu_device[0]);
kobject_set_name(&iop_spu_device[0].kobj, "iop-spu0");
kobject_add(&iop_spu_device[0].kobj);
device_initialize(&iop_spu_device[1]);
kobject_set_name(&iop_spu_device[1].kobj, "iop-spu1");
kobject_add(&iop_spu_device[1].kobj);
device_initialize(&iop_mpu_device);
kobject_set_name(&iop_mpu_device.kobj, "iop-mpu");
kobject_add(&iop_mpu_device.kobj);
#endif
return 0;
}
static void __exit iop_fw_load_exit(void)
{
}
module_init(iop_fw_load_init);
module_exit(iop_fw_load_exit);
MODULE_DESCRIPTION("ETRAX FS IO-Processor Firmware Loader");
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(iop_fw_load_spu);
EXPORT_SYMBOL(iop_fw_load_mpu);
EXPORT_SYMBOL(iop_start_mpu);
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