Add check_member macro to allow clean and easy struct offset checking

This patch adds a new static assertion macro that can be used to check
the offsets in structures that overlay register sets at compile time. It
uses the _Static_assert() declaration from the new ISO C11 standard,
which is supported (even without -std=c11) by GCC after version 4.6.
(There is supposedly also support in clang, although I haven't tried
it... let's deal with compiler issues when/if they turn up.)

I've added it to all structures for our current ARM SoCs for now, and I
think every new register overlay we add going forward should use them
(at least for the last member, but feel free to add more if you think
it's useful).

Change-Id: If32510e7049739ad05618d363a854dc372d64386
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/179412
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
(cherry picked from commit cef5fa13c31375a316ca4556c0039b17c8ea7900)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6905
Tested-by: build bot (Jenkins)

12 files changed, 19 insertions, 9 deletions

diff --git a/src/soc/samsung/exynos5250/clk.h b/src/soc/samsung/exynos5250/clk.h
index f09ac41643..9d27e679ca 100644
--- a/src/soc/samsung/exynos5250/clk.h
+++ b/src/soc/samsung/exynos5250/clk.h
@@ -431,7 +431,7 @@ struct exynos5_clock {
 	unsigned int	clkout_cmu_r1x_div_stat;
 	unsigned char	res98[0x3608];
 
-	unsigned int	bpll_lock;		/* base + 0x2000c */
+	unsigned int	bpll_lock;		/* base + 0x20010 */
 	unsigned char	res99[0xfc];
 	unsigned int	bpll_con0;
 	unsigned int	bpll_con1;
@@ -461,6 +461,7 @@ struct exynos5_clock {
 	unsigned int	pll_div2_sel;
 	unsigned char	res109b[0xf5e4];
 };
+check_member(exynos5_clock, pll_div2_sel, 0x20a24);
 
 static struct exynos5_clock * const exynos_clock = (void *)EXYNOS5_CLOCK_BASE;
 
@@ -521,6 +522,7 @@ struct exynos5_mct {
 	uint8_t		reserved14[0x8];
 	uint32_t	l1_wstat;
 };
+check_member(exynos5_mct, l1_wstat, 0x440);
 
 static struct exynos5_mct * const exynos_mct =
 		(void *)EXYNOS5_MULTI_CORE_TIMER_BASE;
diff --git a/src/soc/samsung/exynos5250/dmc.h b/src/soc/samsung/exynos5250/dmc.h
index 6388316c5e..acd9850a04 100644
--- a/src/soc/samsung/exynos5250/dmc.h
+++ b/src/soc/samsung/exynos5250/dmc.h
@@ -115,6 +115,7 @@ struct exynos5_dmc {
 	unsigned char res34[0xc];
 	unsigned int pmcnt3_ppc_a;
 };
+check_member(exynos5_dmc, pmcnt3_ppc_a, 0xe140);
 
 static struct exynos5_dmc * const exynos_dmc = (void *)EXYNOS5_DMC_CTRL_BASE;
 
@@ -136,7 +137,7 @@ struct exynos5_phy_control {
 	unsigned int phy_con14;
 	unsigned int phy_con15;
 	unsigned int phy_con16;
-	unsigned char res4[4];
+	unsigned char res4[4];	/* NOT a mistake. Yes, it doesn't make sense. */
 	unsigned int phy_con17;
 	unsigned int phy_con18;
 	unsigned int phy_con19;
@@ -164,6 +165,7 @@ struct exynos5_phy_control {
 	unsigned int phy_con41;
 	unsigned int phy_con42;
 };
+check_member(exynos5_phy_control, phy_con42, 0xac);
 
 static struct exynos5_phy_control * const exynos_phy0_control =
 		(void *)EXYNOS5_DMC_PHY0_BASE;
diff --git a/src/soc/samsung/exynos5250/dp.h b/src/soc/samsung/exynos5250/dp.h
index b1533c74f7..d031929ef6 100644
--- a/src/soc/samsung/exynos5250/dp.h
+++ b/src/soc/samsung/exynos5250/dp.h
@@ -163,6 +163,7 @@ struct exynos5_dp {
 	u8	res21[0x3c];
 	u32	soc_general_ctl;
 };
+check_member(exynos5_dp, soc_general_ctl, 0x800);
 
 static struct exynos5_dp * const exynos_dp0 = (void *)EXYNOS5_DP0_BASE;
 static struct exynos5_dp * const exynos_dp1 = (void *)EXYNOS5_DP1_BASE;
diff --git a/src/soc/samsung/exynos5250/dsim.h b/src/soc/samsung/exynos5250/dsim.h
index b9245d31e6..b975a106a8 100644
--- a/src/soc/samsung/exynos5250/dsim.h
+++ b/src/soc/samsung/exynos5250/dsim.h
@@ -48,6 +48,7 @@ struct exynos5_dsim {
 	unsigned int phyacchr;
 	unsigned int phyacchr1;
 };
+check_member(exynos5_dsim, phyacchr1, 0x54);
 
 #define ENABLE		1
 #define DISABLE		0
diff --git a/src/soc/samsung/exynos5250/fimd.h b/src/soc/samsung/exynos5250/fimd.h
index 178fb73d08..751e71b05c 100644
--- a/src/soc/samsung/exynos5250/fimd.h
+++ b/src/soc/samsung/exynos5250/fimd.h
@@ -61,6 +61,7 @@ struct exynos5_fimd {
 	unsigned char res9[0x18];
 	unsigned int dpclkcon;
 };
+check_member(exynos5_fimd, dpclkcon, 0x27c);
 
 static struct exynos5_fimd * const exynos_fimd = (void *)EXYNOS5_FIMD_BASE;
 
@@ -109,6 +110,7 @@ struct exynos5_disp_ctrl {
 	unsigned char res2[0x184];
 	unsigned int trigcon;
 };
+check_member(exynos5_disp_ctrl, trigcon, 0x1a4);
 
 static struct exynos5_disp_ctrl * const exynos_disp_ctrl =
 		(void *)EXYNOS5_DISP1_CTRL_BASE;
diff --git a/src/soc/samsung/exynos5250/power.h b/src/soc/samsung/exynos5250/power.h
index aa93893387..734bb29661 100644
--- a/src/soc/samsung/exynos5250/power.h
+++ b/src/soc/samsung/exynos5250/power.h
@@ -64,6 +64,7 @@ struct exynos5_power {
         uint8_t         reserved8[0x1e0];
 	uint32_t	ps_hold_ctrl;		/* 0x330c */
 } __attribute__ ((__packed__));
+check_member(exynos5_power, ps_hold_ctrl, 0x330c);
 
 static struct exynos5_power * const exynos_power = (void*)EXYNOS5_POWER_BASE;
 
diff --git a/src/soc/samsung/exynos5250/spi.h b/src/soc/samsung/exynos5250/spi.h
index 7ca311444c..4301d42e24 100644
--- a/src/soc/samsung/exynos5250/spi.h
+++ b/src/soc/samsung/exynos5250/spi.h
@@ -39,6 +39,7 @@ struct exynos_spi {
 	unsigned int		fb_clk;		/* 0x2c */
 	unsigned char		padding[0xffd0];
 };
+check_member(exynos_spi, fb_clk, 0x2c);
 
 #define EXYNOS_SPI_MAX_FREQ	50000000
 
diff --git a/src/soc/samsung/exynos5250/sysreg.h b/src/soc/samsung/exynos5250/sysreg.h
index 1362177a33..ece9011abf 100644
--- a/src/soc/samsung/exynos5250/sysreg.h
+++ b/src/soc/samsung/exynos5250/sysreg.h
@@ -32,6 +32,7 @@ struct exynos5_sysreg {
 	unsigned char	res2[0x18];
 	unsigned int	usb20_phy_cfg;
 };
+check_member(exynos5_sysreg, usb20_phy_cfg, 0x230);
 
 static struct exynos5_sysreg * const exynos_sysreg =
 		(void *)EXYNOS5_SYSREG_BASE;
diff --git a/src/soc/samsung/exynos5250/tmu.h b/src/soc/samsung/exynos5250/tmu.h
index bda4bd7dd8..34d1f45fef 100644
--- a/src/soc/samsung/exynos5250/tmu.h
+++ b/src/soc/samsung/exynos5250/tmu.h
@@ -57,6 +57,7 @@ struct tmu_reg {
 	unsigned rsvd15;
 	unsigned emul_con;
 };
+check_member(tmu_reg, emul_con, 0x80);
 
 enum tmu_status_t {
 	TMU_STATUS_INIT = 0,
diff --git a/src/soc/samsung/exynos5250/trustzone.h b/src/soc/samsung/exynos5250/trustzone.h
index 7b4af9b1f1..4cbb1aa1a5 100644
--- a/src/soc/samsung/exynos5250/trustzone.h
+++ b/src/soc/samsung/exynos5250/trustzone.h
@@ -75,6 +75,7 @@ struct exynos_tzpc {
 	u32 pcellid2;
 	u32 pcellid3;
 };
+check_member(exynos_tzpc, pcellid3, 0xffc);
 
 void trustzone_init(void);
 
diff --git a/src/soc/samsung/exynos5250/uart.h b/src/soc/samsung/exynos5250/uart.h
index d324a2f93d..e2514d7b6d 100644
--- a/src/soc/samsung/exynos5250/uart.h
+++ b/src/soc/samsung/exynos5250/uart.h
@@ -21,12 +21,6 @@
 #ifndef CPU_SAMSUNG_EXYNOS5250_UART_H
 #define CPU_SAMSUNG_EXYNOS5250_UART_H
 
-/* baudrate rest value */
-union br_rest {
-	unsigned short	slot;		/* udivslot */
-	unsigned char	value;		/* ufracval */
-};
-
 struct s5p_uart {
 	unsigned int	ulcon;
 	unsigned int	ucon;
@@ -41,8 +35,8 @@ struct s5p_uart {
 	unsigned char	urxh;
 	unsigned char	res2[3];
 	unsigned int	ubrdiv;
-	union br_rest	rest;
 	unsigned char	res3[0xffd0];
 };
+check_member(s5p_uart, ubrdiv, 0x28);
 
 #endif
diff --git a/src/soc/samsung/exynos5250/usb.h b/src/soc/samsung/exynos5250/usb.h
index ad617da96c..20a22571a2 100644
--- a/src/soc/samsung/exynos5250/usb.h
+++ b/src/soc/samsung/exynos5250/usb.h
@@ -58,6 +58,7 @@ struct exynos5_usb_host_phy {
         uint8_t reserved4[4];
         uint32_t usbotgtune;
 };
+check_member(exynos5_usb_host_phy, usbotgtune, 0x40);
 
 static struct exynos5_usb_host_phy * const exynos_usb_host_phy =
 		(void *)EXYNOS5_USB_HOST_PHY_BASE;
@@ -81,6 +82,7 @@ struct exynos5_usb_drd_phy {
 	uint32_t linkhcbelt;
 	uint32_t linkport;
 };
+check_member(exynos5_usb_drd_phy, linkport, 0x44);
 
 static struct exynos5_usb_drd_phy * const exynos_usb_drd_phy =
 		(void *)EXYNOS5_USB_DRD_PHY_BASE;
@@ -121,6 +123,7 @@ struct exynos5_usb_drd_dwc3 {
 	uint32_t usb3pipectl;
 	uint8_t reserved6[60];
 };
+check_member(exynos5_usb_drd_dwc3, usb3pipectl, 0x1c0);
 
 static struct exynos5_usb_drd_dwc3 * const exynos_usb_drd_dwc3 =
 		(void *)EXYNOS5_USB_DRD_DWC3_BASE;