MIPS: ath25: add SoC type detection

Detect SoC type based on device ID and board configuration data.
Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8244/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/ath25/ar2315.c

@@ -24,6 +24,8 @@
 #include <asm/reboot.h>
 #include <asm/time.h>
 
+#include <ath25_platform.h>
+
 #include "devices.h"
 #include "ar2315.h"
 #include "ar2315_regs.h"
@@ -249,6 +251,7 @@ void __init ar2315_plat_mem_setup(void)
 {
 	void __iomem *sdram_base;
 	u32 memsize, memcfg;
+	u32 devid;
 	u32 config;
 
 	/* Detect memory size */
@@ -264,6 +267,25 @@ void __init ar2315_plat_mem_setup(void)
 
 	ar2315_rst_base = ioremap_nocache(AR2315_RST_BASE, AR2315_RST_SIZE);
 
+	/* Detect the hardware based on the device ID */
+	devid = ar2315_rst_reg_read(AR2315_SREV) & AR2315_REV_CHIP;
+	switch (devid) {
+	case 0x91:	/* Need to check */
+		ath25_soc = ATH25_SOC_AR2318;
+		break;
+	case 0x90:
+		ath25_soc = ATH25_SOC_AR2317;
+		break;
+	case 0x87:
+		ath25_soc = ATH25_SOC_AR2316;
+		break;
+	case 0x86:
+	default:
+		ath25_soc = ATH25_SOC_AR2315;
+		break;
+	}
+	ath25_board.devid = devid;
+
 	/* Clear any lingering AHB errors */
 	config = read_c0_config();
 	write_c0_config(config & ~0x3);

arch/mips/ath25/ar5312.c

@@ -24,6 +24,8 @@
 #include <asm/reboot.h>
 #include <asm/time.h>
 
+#include <ath25_platform.h>
+
 #include "devices.h"
 #include "ar5312.h"
 #include "ar5312_regs.h"
@@ -191,10 +193,25 @@ static void __init ar5312_flash_init(void)
 
 void __init ar5312_init_devices(void)
 {
+	struct ath25_boarddata *config;
+
 	ar5312_flash_init();
 
 	/* Locate board/radio config data */
 	ath25_find_config(AR5312_FLASH_BASE, AR5312_FLASH_SIZE);
+	config = ath25_board.config;
+
+	/* AR2313 has CPU minor rev. 10 */
+	if ((current_cpu_data.processor_id & 0xff) == 0x0a)
+		ath25_soc = ATH25_SOC_AR2313;
+
+	/* AR2312 shares the same Silicon ID as AR5312 */
+	else if (config->flags & BD_ISCASPER)
+		ath25_soc = ATH25_SOC_AR2312;
+
+	/* Everything else is probably AR5312 or compatible */
+	else
+		ath25_soc = ATH25_SOC_AR5312;
 }
 
 static void ar5312_restart(char *command)
@@ -282,6 +299,7 @@ void __init ar5312_plat_mem_setup(void)
 {
 	void __iomem *sdram_base;
 	u32 memsize, memcfg, bank0_ac, bank1_ac;
+	u32 devid;
 
 	/* Detect memory size */
 	sdram_base = ioremap_nocache(AR5312_SDRAMCTL_BASE,
@@ -297,6 +315,11 @@ void __init ar5312_plat_mem_setup(void)
 
 	ar5312_rst_base = ioremap_nocache(AR5312_RST_BASE, AR5312_RST_SIZE);
 
+	devid = ar5312_rst_reg_read(AR5312_REV);
+	devid >>= AR5312_REV_WMAC_MIN_S;
+	devid &= AR5312_REV_CHIP;
+	ath25_board.devid = (u16)devid;
+
 	/* Clear any lingering AHB errors */
 	ar5312_rst_reg_read(AR5312_PROCADDR);
 	ar5312_rst_reg_read(AR5312_DMAADDR);

arch/mips/ath25/devices.c

@@ -9,10 +9,25 @@
 #include "ar2315.h"
 
 struct ar231x_board_config ath25_board;
+enum ath25_soc_type ath25_soc = ATH25_SOC_UNKNOWN;
+
+static const char * const soc_type_strings[] = {
+	[ATH25_SOC_AR5312] = "Atheros AR5312",
+	[ATH25_SOC_AR2312] = "Atheros AR2312",
+	[ATH25_SOC_AR2313] = "Atheros AR2313",
+	[ATH25_SOC_AR2315] = "Atheros AR2315",
+	[ATH25_SOC_AR2316] = "Atheros AR2316",
+	[ATH25_SOC_AR2317] = "Atheros AR2317",
+	[ATH25_SOC_AR2318] = "Atheros AR2318",
+	[ATH25_SOC_UNKNOWN] = "Atheros (unknown)",
+};
 
 const char *get_system_type(void)
 {
-	return "Atheros (unknown)";
+	if ((ath25_soc >= ARRAY_SIZE(soc_type_strings)) ||
+	    !soc_type_strings[ath25_soc])
+		return soc_type_strings[ATH25_SOC_UNKNOWN];
+	return soc_type_strings[ath25_soc];
 }
 
 void __init ath25_serial_setup(u32 mapbase, int irq, unsigned int uartclk)

arch/mips/ath25/devices.h

@@ -7,6 +7,22 @@
 
 #define ATH25_IRQ_CPU_CLOCK	(MIPS_CPU_IRQ_BASE + 7)	/* C0_CAUSE: 0x8000 */
 
+enum ath25_soc_type {
+	/* handled by ar5312.c */
+	ATH25_SOC_AR2312,
+	ATH25_SOC_AR2313,
+	ATH25_SOC_AR5312,
+
+	/* handled by ar2315.c */
+	ATH25_SOC_AR2315,
+	ATH25_SOC_AR2316,
+	ATH25_SOC_AR2317,
+	ATH25_SOC_AR2318,
+
+	ATH25_SOC_UNKNOWN
+};
+
+extern enum ath25_soc_type ath25_soc;
 extern struct ar231x_board_config ath25_board;
 extern void (*ath25_irq_dispatch)(void);