mx7: Distinguish between dual and solo versions

Read the number of cores in the fuses to distinguish between
the dual and solo versions.

Tested on a mx7d sabresd and on a mx7solo warp7.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>

arch/arm/cpu/armv7/mx7/soc.c

@@ -165,6 +165,21 @@ u32 get_cpu_temp_grade(int *minc, int *maxc)
 	return val;
 }
 
+static bool is_mx7d(void)
+{
+	struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
+	struct fuse_bank *bank = &ocotp->bank[1];
+	struct fuse_bank1_regs *fuse =
+		(struct fuse_bank1_regs *)bank->fuse_regs;
+	int val;
+
+	val = readl(&fuse->tester4);
+	if (val & 1)
+		return false;
+	else
+		return true;
+}
+
 u32 get_cpu_rev(void)
 {
 	struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *)
@@ -172,6 +187,9 @@ u32 get_cpu_rev(void)
 	u32 reg = readl(&ccm_anatop->digprog);
 	u32 type = (reg >> 16) & 0xff;
 
+	if (!is_mx7d())
+		type = MXC_CPU_MX7S;
+
 	reg &= 0xff;
 	return (type << 12) | reg;
 }

arch/arm/imx-common/cpu.c

@@ -137,6 +137,8 @@ unsigned imx_ddr_size(void)
 const char *get_imx_type(u32 imxtype)
 {
 	switch (imxtype) {
+	case MXC_CPU_MX7S:
+		return "7SOLO";	/* Single-core version of the mx7 */
 	case MXC_CPU_MX7D:
 		return "7D";	/* Dual-core version of the mx7 */
 	case MXC_CPU_MX6QP:

arch/arm/include/asm/arch-imx/cpu.h

@@ -21,6 +21,7 @@
 #define MXC_CPU_MX6D		0x67
 #define MXC_CPU_MX6DP		0x68
 #define MXC_CPU_MX6QP		0x69
+#define MXC_CPU_MX7S		0x71 /* dummy ID */
 #define MXC_CPU_MX7D		0x72
 #define MXC_CPU_VF610		0xF6 /* dummy ID */