GTA02 A6+ has board rev detection capability, provide
int gta02_get_pcb_revision(void)
which returns
b9 b8 b2 b1 b0
GPD4 GPD3 GPD0 GPC15 GPC13
GTA02 A5 and before: 0x000
GTA02 A6 : 0x101
Also create pcb_rev in the environment, which contains, eg, 0x101 and
can be passed into the operating system on the commandline. For linux
this can then be seen from userspace by
cat /proc/cmdline
Signed-off-by: Andy Green <[EMAIL PROTECTED]>
---
board/neo1973/gta02/gta02.c | 73 ++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 72 insertions(+), 1 deletions(-)
diff --git a/board/neo1973/gta02/gta02.c b/board/neo1973/gta02/gta02.c
index 07b0917..9583d79 100644
--- a/board/neo1973/gta02/gta02.c
+++ b/board/neo1973/gta02/gta02.c
@@ -68,6 +68,8 @@ extern unsigned char booted_from_nand;
extern unsigned char booted_from_nor;
extern int nobootdelay;
+int gta02_get_pcb_revision(void);
+
static inline void delay (unsigned long loops)
{
__asm__ volatile ("1:\n"
@@ -170,12 +172,25 @@ int board_init(void)
gpio->GPBCON = 0x00155555;
gpio->GPBUP = 0x000007FF;
- /* pulldown on "PIO_5" BT module to stop float when unpowered */
+ /*
+ * PCB rev index found on C13, C15, D0, D3 and D4. These are NC or
+ * pulled up by 10K. Therefore to ensure no current flows when they
+ * are not interrogated, we drive them high. When we interrogate them
+ * we make them pulled them down inputs briefly and set them high op
+ * again afterwards.
+ */
+
+ /* pulldown on "PIO_5" BT module to stop float when unpowered
+ * C13 and C15 are b0 and b1 of PCB rev index
+ */
gpio->GPCCON = 0x55555155;
gpio->GPCUP = 0x0000FFFF & ~(1 << 5);
+ gpio->GPCDAT |= (1 << 13) | (1 << 15); /* index detect -> hi */
+ /* D0, D3 and D4 are b2, b3 and b4 of PCB rev index */
gpio->GPDCON = 0x55555555;
gpio->GPDUP = 0x0000FFFF;
+ gpio->GPDDAT |= (1 << 0) | (1 << 3) | (1 << 4); /* index detect -> hi */
/* pulldown on GPE11 / SPIMISO0 - goes to debug board and will float */
gpio->GPECON = 0xAAAAAAAA;
@@ -245,6 +260,12 @@ int board_late_init(void)
char buf[32];
int menu_vote = 0; /* <= 0: no, > 0: yes */
int seconds = 0;
+ int rev = gta02_get_pcb_revision();
+
+ printf("PCB rev: 0x%03X\n", rev);
+ /* expose in the env so we can add to kernel commandline */
+ sprintf(buf, "0x%03X", rev);
+ setenv("pcb_rev", buf);
/* Initialize the Power Management Unit with a safe register set */
pcf50633_init();
@@ -521,3 +542,53 @@ void neo1973_led(int led, int on)
else
gpio->GPBDAT &= ~(1 << led);
}
+
+/**
+ * returns PCB revision information in b9,b8 and b2,b1,b0
+ * Pre-GTA02 A6 returns 0x000
+ * GTA02 A6 returns 0x101
+ */
+
+int gta02_get_pcb_revision(void)
+{
+ S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
+ int n;
+ u32 u;
+
+ /* make C13 and C15 pulled-down inputs */
+ gpio->GPCCON &= ~0xcc000000;
+ gpio->GPCUP &= ~((1 << 13) | (1 << 15));
+ /* D0, D3 and D4 pulled-down inputs */
+ gpio->GPDCON &= ~0x000003c3;
+ gpio->GPDUP &= ~((1 << 0) | (1 << 3) | (1 << 4));
+
+ /* delay after changing pulldowns */
+ u = gpio->GPCDAT;
+ u = gpio->GPDDAT;
+
+ /* read the version info */
+ u = gpio->GPCDAT;
+ n = (u >> (13 - 0)) & 0x001;
+ n |= (u >> (15 - 1)) & 0x002;
+ u = gpio->GPDDAT;
+ n |= (u << (0 + 2)) & 0x004;
+
+ n |= (u << (8 - 3)) & 0x100;
+ n |= (u << (9 - 4)) & 0x200;
+
+ /*
+ * when not being interrogated, all of the revision GPIO
+ * are set to output HIGH without pulldown so no current flows
+ * if they are NC or pulled up.
+ */
+ /* make C13 and C15 high ouputs with no pulldowns */
+ gpio->GPCCON |= 0x44000000;
+ gpio->GPCUP |= (1 << 13) | (1 << 15);
+ gpio->GPCDAT |= (1 << 13) | (1 << 15);
+ /* D0, D3 and D4 high ouputs with no pulldowns */
+ gpio->GPDCON |= 0x00000141;
+ gpio->GPDUP |= (1 << 0) | (1 << 3) | (1 << 4);
+ gpio->GPDDAT |= (1 << 0) | (1 << 3) | (1 << 4);
+
+ return n;
+}
