imx: imx_snvs: Define a SNVS header and memory map

This commit defines two things.

- The basic SNVS memory map. At the moment that is total overkill for the
  permission bits we need to set inside the SNVS but, for the sake of
  completeness define the whole SNVS area as a struct.

- The bits of the HPCOMR register

  A permission fix will need to be applied to the SNVS block prior to
  switching on TrustZone. All we need to do is waggle a bit in the HPCOMR
  register. To do that waggle we first need to define the bits of the
  HPCOMR register.

- A imx_snvs_init() function definition

  Declare the snvs_init() function so that it can be called from our
  platform setup code.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

plat/imx/common/include/imx_snvs.h

+/*
+ * Copyright (C) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef __IMX_SNVS_H__
+#define __IMX_SNVS_H__
+
+#include <stdint.h>
+#include <arch.h>
+
+struct snvs {
+	uint32_t hplr;
+	uint32_t hpcomr;
+	uint32_t hpcr;
+	uint32_t hpsicr;
+	uint32_t hpsvcr;
+	uint32_t hpsr;
+	uint32_t hpsvsr;
+	uint32_t hphacivr;
+	uint32_t hphacr;
+	uint32_t hprtcmr;
+	uint32_t hprtclr;
+	uint32_t hptamr;
+	uint32_t hptalr;
+	uint32_t lplr;
+	uint32_t lpcr;
+	uint32_t lpmkcr;
+	uint32_t lpsvcr;
+	uint32_t lptgfcr;
+	uint32_t lptdcr;
+	uint32_t lpsr;
+	uint32_t lpsrtcmr;
+	uint32_t lpsrtclr;
+	uint32_t lptar;
+	uint32_t lpsmcmr;
+	uint32_t lpsmclr;
+	uint32_t lppgdr;
+	uint32_t lpgpr0_alias;
+	uint8_t  lpzmkr[32];
+	uint16_t res0;
+	uint32_t lpgpr0[4];
+	uint32_t lptdc2r;
+	uint32_t lptdsr;
+	uint32_t lptgf1cr;
+	uint32_t lptgf2cr;
+	uint32_t res1[4];
+	uint32_t lpat1cr;
+	uint32_t lpat2cr;
+	uint32_t lpat3cr;
+	uint32_t lpat4cr;
+	uint32_t lpat5cr;
+	uint32_t res2[3];
+	uint32_t lpatctlr;
+	uint32_t lpatclkr;
+	uint32_t lpatrc1r;
+	uint32_t lpatrc2r;
+	uint32_t res3[706];
+	uint32_t hpvidr1;
+	uint32_t hpvidr2;
+} __packed;
+
+/* Define the HPCOMR bits */
+#define HPCOMR_NPSWA_EN		BIT(31)
+#define HPCOMR_HAC_STOP		BIT(19)
+#define HPCOMR_HAC_CLEAR	BIT(18)
+#define HPCOMR_HAC_LOAD		BIT(17)
+#define HPCOMR_HAC_EN		BIT(16)
+#define HPCOMR_MKS_EN		BIT(13)
+#define HPCOMR_PROG_ZMK		BIT(12)
+#define HPCOMR_SW_LPSV		BIT(10)
+#define HPCOMR_SW_FSV		BIT(9)
+#define HPCOMR_SW_SV		BIT(8)
+#define HPCOMR_LP_SWR_DIS	BIT(5)
+#define HPCOMR_LP_SWR		BIT(4)
+#define HPCOMR_SSM_SFNS_DIS	BIT(2)
+#define HPCOMR_SSM_ST_DIS	BIT(1)
+#define HPCOMR_SSM_ST		BIT(0)
+
+void imx_snvs_init(void);
+
+#endif /* __IMX_SNVS_H__ */