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kmp204x: initial support for PCIe FPGA configuration

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The PEXHC PCIe configuration mechanism ensures that the FPGA get
configured at power-up. Since all the PCIe devices should be configured
when the kernel start, u-boot has to take care that the FPGA gets
configured also in other reset scenarios, mostly because of possible
configuration change.

The used mechanism is taken from the km_kirkwood design and adapted to
the kmp204x case (slightly different HW and PCIe configuration).

Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
Reviewed-by: York Sun <yorksun@freescale.com>
This commit is contained in:
Valentin Longchamp 2014-01-27 11:49:12 +01:00 • committed by York Sun
parent 47c1180c02
commit 27c78e06f2
2 changed files with 91 additions and 1 deletions
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7
board/keymile/kmp204x/kmp204x.c
View file

@ -101,6 +101,7 @@ int board_early_init_f(void)
int board_early_init_r(void)
{
int ret = 0;
/* Flush d-cache and invalidate i-cache of any FLASH data */
flush_dcache();
invalidate_icache();
@ -108,7 +109,11 @@ int board_early_init_r(void)
set_liodns();
setup_portals();
return 0;
ret = trigger_fpga_config();
if (ret)
printf("error triggering PCIe FPGA config\n");
return ret;
}
unsigned long get_board_sys_clk(unsigned long dummy)

85
board/keymile/kmp204x/pci.c
View file

@ -14,18 +14,103 @@
#include <libfdt.h>
#include <fdt_support.h>
#include <asm/fsl_serdes.h>
#include <asm/errno.h>
#include "kmp204x.h"
#define PROM_SEL_L 11
/* control the PROM_SEL_L signal*/
static void toggle_fpga_eeprom_bus(bool cpu_own)
{
qrio_gpio_direction_output(GPIO_A, PROM_SEL_L, !cpu_own);
}
#define CONF_SEL_L 10
#define FPGA_PROG_L 19
#define FPGA_DONE 18
#define FPGA_INIT_L 17
int trigger_fpga_config(void)
{
int ret = 0, init_l;
/* approx 10ms */
u32 timeout = 10000;
/* make sure the FPGA_can access the EEPROM */
toggle_fpga_eeprom_bus(false);
/* assert CONF_SEL_L to be able to drive FPGA_PROG_L */
qrio_gpio_direction_output(GPIO_A, CONF_SEL_L, 0);
/* trigger the config start */
qrio_gpio_direction_output(GPIO_A, FPGA_PROG_L, 0);
/* small delay for INIT_L line */
udelay(10);
/* wait for FPGA_INIT to be asserted */
do {
init_l = qrio_get_gpio(GPIO_A, FPGA_INIT_L);
if (timeout-- == 0) {
printf("FPGA_INIT timeout\n");
ret = -EFAULT;
break;
}
udelay(10);
} while (init_l);
/* deassert FPGA_PROG, config should start */
qrio_set_gpio(GPIO_A, FPGA_PROG_L, 1);
return ret;
}
/* poll the FPGA_DONE signal and give the EEPROM back to the QorIQ */
static int wait_for_fpga_config(void)
{
int ret = 0, done;
/* approx 5 s */
u32 timeout = 500000;
printf("PCIe FPGA config:");
do {
done = qrio_get_gpio(GPIO_A, FPGA_DONE);
if (timeout-- == 0) {
printf(" FPGA_DONE timeout\n");
ret = -EFAULT;
goto err_out;
}
udelay(10);
} while (!done);
printf(" done\n");
err_out:
/* deactive CONF_SEL and give the CPU conf EEPROM access */
qrio_set_gpio(GPIO_A, CONF_SEL_L, 1);
toggle_fpga_eeprom_bus(true);
return ret;
}
#define PCIE_SW_RST 14
#define PEXHC_SW_RST 13
#define HOOPER_SW_RST 12
void pci_init_board(void)
{
/* first wait for the PCIe FPGA to be configured
* it has been triggered earlier in board_early_init_r */
int ret = wait_for_fpga_config();
if (ret)
printf("error finishing PCIe FPGA config\n");
qrio_prst(PCIE_SW_RST, false, false);
qrio_prst(PEXHC_SW_RST, false, false);
qrio_prst(HOOPER_SW_RST, false, false);
/* Hooper is not direcly PCIe capable */
mdelay(50);
fsl_pcie_init_board(0);
}