From patchwork Fri Jan 6 02:41:51 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [1/2] ARM: mxs: detect SoC by checking CHIPID register Date: Thu, 05 Jan 2012 16:41:51 -0000 From: Shawn Guo X-Patchwork-Id: 134585 Message-Id: <1325817712-4573-2-git-send-email-shawn.guo@linaro.org> To: linux-arm-kernel@lists.infradead.org Cc: Shawn Guo , Wolfram Sang , Lauri Hintsala Both imx23 and imx28 have CHIPID register at address 0x8001c310, which can be used to identify the SoC. This patch changes cpu_is_xxx and __arch_decomp_setup to use this CHIPID register than machine type to detect the chip between imx23 and imx28, so that we do not need to change these functions whenever a new board/machine gets added. Suggested-by: Wolfram Sang Signed-off-by: Shawn Guo --- arch/arm/mach-mxs/include/mach/mxs.h | 28 ++++++++++++++------------ arch/arm/mach-mxs/include/mach/uncompress.h | 11 +++++---- 2 files changed, 21 insertions(+), 18 deletions(-) diff --git a/arch/arm/mach-mxs/include/mach/mxs.h b/arch/arm/mach-mxs/include/mach/mxs.h index bde5f66..cf39c3b 100644 --- a/arch/arm/mach-mxs/include/mach/mxs.h +++ b/arch/arm/mach-mxs/include/mach/mxs.h @@ -26,19 +26,6 @@ #include /* - * MXS CPU types - */ -#define cpu_is_mx23() ( \ - machine_is_mx23evk() || \ - machine_is_stmp378x() || \ - 0) -#define cpu_is_mx28() ( \ - machine_is_mx28evk() || \ - machine_is_m28evk() || \ - machine_is_tx28() || \ - 0) - -/* * IO addresses common to MXS-based */ #define MXS_IO_BASE_ADDR 0x80000000 @@ -109,6 +96,21 @@ static inline void __mxs_togl(u32 mask, void __iomem *reg) { __raw_writel(mask, reg + MXS_TOG_ADDR); } + +/* + * MXS CPU types + */ +#define CHIPID (MXS_IO_ADDRESS(MXS_DIGCTL_BASE_ADDR) + 0x310) + +static inline int cpu_is_mx23(void) +{ + return ((__raw_readl(CHIPID) >> 16) == 0x3780); +} + +static inline int cpu_is_mx28(void) +{ + return ((__raw_readl(CHIPID) >> 16) == 0x2800); +} #endif #endif /* __MACH_MXS_H__ */ diff --git a/arch/arm/mach-mxs/include/mach/uncompress.h b/arch/arm/mach-mxs/include/mach/uncompress.h index 6777674..a8de26d 100644 --- a/arch/arm/mach-mxs/include/mach/uncompress.h +++ b/arch/arm/mach-mxs/include/mach/uncompress.h @@ -55,16 +55,17 @@ static inline void flush(void) #define MX23_DUART_BASE_ADDR 0x80070000 #define MX28_DUART_BASE_ADDR 0x80074000 +#define MXS_DIGCTL_CHIPID 0x8001c310 static inline void __arch_decomp_setup(unsigned long arch_id) { - switch (arch_id) { - case MACH_TYPE_MX23EVK: + u16 chipid = (*(volatile unsigned long *) MXS_DIGCTL_CHIPID) >> 16; + + switch (chipid) { + case 0x3780: mxs_duart_base = MX23_DUART_BASE_ADDR; break; - case MACH_TYPE_MX28EVK: - case MACH_TYPE_M28EVK: - case MACH_TYPE_TX28: + case 0x2800: mxs_duart_base = MX28_DUART_BASE_ADDR; break; default: