* Linux CAN-bus device driver.
* The card support added by Paolo Grisleri <grisleri@ce.unipr.it>
* This software is released under the GPL-License.
- * Version lincan-0.2 9 Jul 2003
+ * Version lincan-0.3 17 Jun 2004
*/
#include "../include/can.h"
# define EMS_CPCPCI_PCICAN_VENDOR 0x110a
# define EMS_CPCPCI_PCICAN_ID 0x2104
-/*The PSB4610 is used as PCI to local bus bridge*/
+/*The Infineon PSB4610 PITA-2 is used as PCI to local bus bridge*/
/*BAR0 - MEM - bridge control registers*/
/*BAR1 - MEM - parallel interface*/
* each register occupies 4 bytes
*/
-/*AMCC 5920*/
-#define S5920_OMB 0x0C
-#define S5920_IMB 0x1C
-#define S5920_MBEF 0x34
-#define S5920_INTCSR 0x38
-#define S5920_RCR 0x3C
-#define S5920_PTCR 0x60
+/*PSB4610 PITA-2 bridge control registers*/
+#define PITA2_ICR 0x00 /* Interrupt Control Register */
+#define PITA2_ICR_INT0 0x00000002 /* [RC] INT0 Active/Clear */
+#define PITA2_ICR_GP0_INT 0x00000004 /* [RC] GP0 Interrupt */
+ /* GP0_Int_En=1, GP0_Out_En=0 and low detected */
+#define PITA2_ICR_GP1_INT 0x00000008 /* [RC] GP1 Interrupt */
+#define PITA2_ICR_GP2_INT 0x00000010 /* [RC] GP2 Interrupt */
+#define PITA2_ICR_GP3_INT 0x00000020 /* [RC] GP2 Interrupt */
+#define PITA2_ICR_INT0_En 0x00020000 /* [RW] Enable INT0 */
-#define INTCSR_ADDON_INTENABLE_M 0x2000
-#define INTCSR_INTERRUPT_ASSERTED_M 0x800000
+#define PITA2_MISC 0x1C /* Miscellaneous Register */
+#define PITA2_MISC_CONFIG 0x04000000
+ /* Multiplexed Parallel_interface_mode */
#define EMS_CPCPCI_BYTES_PER_CIRCUIT 0x200
/* Each CPC register occupies 4 bytes */
/*
-You need to know the following:
+The board configuration is probably following:
" RX1 is connected to ground.
" TX1 is not connected.
" CLKO is not connected.
" Setting the OCR register to 0xDA is a good idea.
This means normal output mode , push-pull and the correct polarity.
" In the CDR register, you should set CBP to 1.
- You will probably also want to set the clock divider value to 0 (meaning divide-by-2),
- the Pelican bit, and the clock-off bit (you have no need for CLKOUT anyway.)
+ You will probably also want to set the clock divider value to 7
+ (meaning direct oscillator output) because the second SJA1000 chip
+ is driven by the first one CLKOUT output.
*/
void ems_cpcpci_disconnect_irq(struct candevice_t *candev)
{
- unsigned long tmp;
/* Disable interrupts from card */
- tmp = inl(candev->dev_base_addr + S5920_INTCSR);
- tmp &= ~INTCSR_ADDON_INTENABLE_M;
- outl(tmp, candev->dev_base_addr + S5920_INTCSR);
+ writel(0, candev->dev_base_addr + PITA2_ICR);
}
void ems_cpcpci_connect_irq(struct candevice_t *candev)
{
- unsigned long tmp;
/* Enable interrupts from card */
- tmp = inl(candev->dev_base_addr + S5920_INTCSR);
- tmp |= INTCSR_ADDON_INTENABLE_M;
- outl(tmp, candev->dev_base_addr + S5920_INTCSR);
+ writel(PITA2_ICR_INT0_En, candev->dev_base_addr + PITA2_ICR);
}
int ems_cpcpci_request_io(struct candevice_t *candev)
{
+ unsigned long pita2_addr;
+ unsigned long io_addr;
+ int i;
+
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,4,21))
- if(pci_request_region(candev->sysdevptr.pcidev, 0, "ems_cpcpci_s5920") != 0){
- CANMSG("Request of ems_cpcpci_s5920 range failed\n");
+ if(pci_request_region(candev->sysdevptr.pcidev, 0, "ems_cpcpci_pita2") != 0){
+ CANMSG("Request of ems_cpcpci_pita2 range failed\n");
return -ENODEV;
}else if(pci_request_region(candev->sysdevptr.pcidev, 1, "ems_cpcpci_io") != 0){
CANMSG("Request of ems_cpcpci_io range failed\n");
goto error_io;
- }else if(pci_request_region(candev->sysdevptr.pcidev, 2, "ems_cpcpci_xilinx") != 0){
- CANMSG("Request of ems_cpcpci_xilinx range failed\n");
- goto error_xilinx;
}
#else /*(LINUX_VERSION_CODE > KERNEL_VERSION(2,4,21))*/
if(pci_request_regions(candev->sysdevptr.pcidev, "EMS_CPCPCI") != 0){
}
#endif /*(LINUX_VERSION_CODE > KERNEL_VERSION(2,4,21))*/
+ pita2_addr=pci_resource_start(candev->sysdevptr.pcidev,0);
+ if (!(candev->dev_base_addr = (long) ioremap(pita2_addr,
+ pci_resource_len(candev->sysdevptr.pcidev,0)))) {
+ CANMSG("Unable to access I/O memory at: 0x%lx\n", pita2_addr);
+ goto error_ioremap_pita2;
+ }
+
+ io_addr=pci_resource_start(candev->sysdevptr.pcidev,1);;
+ if (!(candev->io_addr = (long) ioremap(io_addr,
+ pci_resource_len(candev->sysdevptr.pcidev,1)))) {
+ CANMSG("Unable to access I/O memory at: 0x%lx\n", io_addr);
+ goto error_ioremap_io;
+ }
+
+ candev->res_addr=candev->io_addr;
+
+ /*
+ * this is redundant with chip initialization, but remap address
+ * can change when resources are temporarily released
+ */
+ for(i=0;i<candev->nr_all_chips;i++) {
+ struct canchip_t *chip=candev->chip[i];
+ if(!chip) continue;
+ chip->chip_base_addr = candev->io_addr+
+ 0x400 + i*EMS_CPCPCI_BYTES_PER_CIRCUIT;
+ if(!chip->msgobj[0]) continue;
+ chip->msgobj[0]->obj_base_addr=chip->chip_base_addr;
+ }
+
+ /* Configure PITA-2 parallel interface */
+ writel(PITA2_MISC_CONFIG, candev->dev_base_addr + PITA2_MISC);
+
ems_cpcpci_disconnect_irq(candev);
return 0;
+ error_ioremap_io:
+ iounmap((void*)candev->dev_base_addr);
+ error_ioremap_pita2:
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,4,21))
- error_xilinx:
pci_release_region(candev->sysdevptr.pcidev, 1);
error_io:
pci_release_region(candev->sysdevptr.pcidev, 0);
+ #else /*(LINUX_VERSION_CODE > KERNEL_VERSION(2,4,21))*/
+ pci_release_regions(candev->sysdevptr.pcidev);
#endif /*(LINUX_VERSION_CODE > KERNEL_VERSION(2,4,21))*/
return -ENODEV;
{
ems_cpcpci_disconnect_irq(candev);
+ iounmap((void*)candev->io_addr);
+ iounmap((void*)candev->dev_base_addr);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,4,21))
- pci_release_region(candev->sysdevptr.pcidev, 2);
pci_release_region(candev->sysdevptr.pcidev, 1);
pci_release_region(candev->sysdevptr.pcidev, 0);
#else /*(LINUX_VERSION_CODE > KERNEL_VERSION(2,4,21))*/
{
address += ((address&(EMS_CPCPCI_BYTES_PER_CIRCUIT-1))
*(EMS_CPCPCI_BYTES_PER_REG-1));
- readb(data,address);
+ writeb(data,address);
}
unsigned ems_cpcpci_read_register(unsigned long address)
{
address += ((address&(EMS_CPCPCI_BYTES_PER_CIRCUIT-1))
*(EMS_CPCPCI_BYTES_PER_REG-1));
- return inb(address);
+ return readb(address);
+}
+
+int ems_cpcpci_irq_handler(int irq, struct canchip_t *chip)
+{
+ //struct canchip_t *chip=(struct canchip_t *)dev_id;
+ struct candevice_t *candev=chip->hostdevice;
+ int i;
+ unsigned long icr;
+ int test_irq_again;
+
+ icr=readl(candev->dev_base_addr + PITA2_ICR);
+ if(!(icr & PITA2_ICR_INT0)) return CANCHIP_IRQ_NONE;
+
+ /* correct way to handle interrupts from all chips connected to the one PITA-2 */
+ do {
+ writel(PITA2_ICR_INT0_En | PITA2_ICR_INT0, candev->dev_base_addr + PITA2_ICR);
+ test_irq_again=0;
+ for(i=0;i<candev->nr_all_chips;i++){
+ chip=candev->chip[i];
+ if(!chip || !(chip->flags&CHIP_CONFIGURED))
+ continue;
+ if(sja1000p_irq_handler(irq, chip))
+ test_irq_again=1;
+ }
+ icr=readl(candev->dev_base_addr + PITA2_ICR);
+ } while((icr & PITA2_ICR_INT0)||test_irq_again);
+ return CANCHIP_IRQ_HANDLED;
}
int ems_cpcpci_reset(struct candevice_t *candev)
{
int i=0,chip_nr;
- struct chip_t *chip;
+ struct canchip_t *chip;
unsigned cdr;
DEBUGMSG("Resetting EMS_CPCPCI hardware ...\n");
/* Assert PTADR# - we're in passive mode so the other bits are not important */
- outl(0x80808080L, candev->dev_base_addr + S5920_PTCR);
ems_cpcpci_disconnect_irq(candev);
if(!candev->chip[chip_nr]) continue;
chip=candev->chip[chip_nr];
- ems_cpcpci_write_register(MOD_RM, chip->chip_base_addr+SJAMOD);
+ ems_cpcpci_write_register(sjaMOD_RM, chip->chip_base_addr+SJAMOD);
udelay(1000);
cdr=ems_cpcpci_read_register(chip->chip_base_addr+SJACDR);
- ems_cpcpci_write_register(cdr|CDR_PELICAN, chip->chip_base_addr+SJACDR);
+ ems_cpcpci_write_register(cdr|sjaCDR_PELICAN, chip->chip_base_addr+SJACDR);
ems_cpcpci_write_register(0, chip->chip_base_addr+SJAIER);
i=20;
ems_cpcpci_write_register(0, chip->chip_base_addr+SJAMOD);
- while (ems_cpcpci_read_register(chip->chip_base_addr+SJAMOD)&MOD_RM){
+ while (ems_cpcpci_read_register(chip->chip_base_addr+SJAMOD)&sjaMOD_RM){
if(!i--) return -ENODEV;
udelay(1000);
ems_cpcpci_write_register(0, chip->chip_base_addr+SJAMOD);
}
cdr=ems_cpcpci_read_register(chip->chip_base_addr+SJACDR);
- ems_cpcpci_write_register(cdr|CDR_PELICAN, chip->chip_base_addr+SJACDR);
+ ems_cpcpci_write_register(cdr|sjaCDR_PELICAN, chip->chip_base_addr+SJACDR);
ems_cpcpci_write_register(0, chip->chip_base_addr+SJAIER);
{
struct pci_dev *pcidev = NULL;
int i;
+ unsigned long l;
pcidev = pci_find_device(EMS_CPCPCI_PCICAN_VENDOR, EMS_CPCPCI_PCICAN_ID, pcidev);
if(pcidev == NULL) return -ENODEV;
return -EIO;
}
}
- candev->dev_base_addr=pci_resource_start(pcidev,0); /*S5920*/
+
+ /*request IO access temporarily to check card presence*/
+ if(ems_cpcpci_request_io(candev)<0)
+ return -ENODEV;
+
+ /*** candev->dev_base_addr=pci_resource_start(pcidev,0); ***/
/* some control registers */
- candev->io_addr=pci_resource_start(pcidev,1);
+ /*** candev->io_addr=pci_resource_start(pcidev,1); ***/
/* 0 more EMS control registers
* 0x400 the first SJA1000
* 0x600 the second SJA1000
*/
/*candev->flags |= CANDEV_PROGRAMMABLE_IRQ;*/
-
- if (!strcmp(candev->hwname,"ems_cpcpci")) {
- candev->nr_82527_chips=0;
- candev->nr_sja1000_chips=2;
- candev->nr_all_chips=2;
+
+ for(l=0,i=0;i<4;i++){
+ l<<=8;
+ l|=readb(candev->io_addr + i*4);
}
+ i=readb(candev->io_addr + i*5);
+
+ CANMSG("EMS CPC-PCI check value %04lx, ID %d\n", l, i);
+
+ if(l!=0x55aa01cb) {
+ CANMSG("EMS CPC-PCI unexpected check values\n");
+ }
+
+ /*if (!strcmp(candev->hwname,"ems_cpcpci"))*/
+ candev->nr_82527_chips=0;
+ candev->nr_sja1000_chips=2;
+ candev->nr_all_chips=2;
+
+ ems_cpcpci_release_io(candev);
return 0;
}
int ems_cpcpci_init_chip_data(struct candevice_t *candev, int chipnr)
{
-
if(candev->sysdevptr.pcidev==NULL)
return -ENODEV;
+
+ /* initialize common routines for the SJA1000 chip */
+ sja1000p_fill_chipspecops(candev->chip[chipnr]);
+ /* special version of the IRQ handler is required for CPC-PCI board */
+ candev->chip[chipnr]->chipspecops->irq_handler=ems_cpcpci_irq_handler;
+
candev->chip[chipnr]->chip_irq=candev->sysdevptr.pcidev->irq;
- candev->chip[chipnr]->chip_type="sja1000p";
candev->chip[chipnr]->chip_base_addr = candev->io_addr+
0x400 + chipnr*EMS_CPCPCI_BYTES_PER_CIRCUIT;
candev->chip[chipnr]->flags = 0;
candev->chip[chipnr]->int_cpu_reg = 0;
candev->chip[chipnr]->int_clk_reg = 0;
candev->chip[chipnr]->int_bus_reg = 0;
- candev->chip[chipnr]->sja_cdr_reg = CDR_CBP | CDR_CLK_OFF;
+ /* CLKOUT has to be equal to oscillator frequency to drive second chip */
+ candev->chip[chipnr]->sja_cdr_reg = sjaCDR_CBP | 7;
candev->chip[chipnr]->sja_ocr_reg = EMS_CPCPCI_OCR_DEFAULT_STD;
- candev->chip[chipnr]->clock = 8000000;
+ candev->chip[chipnr]->clock = 16000000;
candev->chip[chipnr]->flags |= CHIP_IRQ_PCI;
return 0;
}
-int ems_cpcpci_init_obj_data(struct chip_t *chip, int objnr)
+int ems_cpcpci_init_obj_data(struct canchip_t *chip, int objnr)
{
chip->msgobj[objnr]->obj_base_addr=chip->chip_base_addr;
return 0;
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