MIPS: TXx9: Make spi_eeprom.c more generic

Helper routines in txx9/rbtx4938/spi_eeprom.c is not TX4938 specific.
Move it to txx9/generic/ directory and make it works with SPI bus
number other than 0.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

 create mode 100644 arch/mips/txx9/generic/spi_eeprom.c
 delete mode 100644 arch/mips/txx9/rbtx4938/spi_eeprom.c

arch/mips/txx9/generic/Makefile

@@ -8,5 +8,6 @@ obj-$(CONFIG_SOC_TX3927)	+= setup_tx3927.o irq_tx3927.o
 obj-$(CONFIG_SOC_TX4927)	+= mem_tx4927.o setup_tx4927.o irq_tx4927.o
 obj-$(CONFIG_SOC_TX4938)	+= mem_tx4927.o setup_tx4938.o irq_tx4938.o
 obj-$(CONFIG_TOSHIBA_FPCIB0)	+= smsc_fdc37m81x.o
+obj-$(CONFIG_SPI)		+= spi_eeprom.o
 
 EXTRA_CFLAGS += -Werror

arch/mips/txx9/generic/spi_eeprom.c

@@ -18,29 +18,31 @@
 #define AT250X0_PAGE_SIZE	8
 
 /* register board information for at25 driver */
-int __init spi_eeprom_register(int chipid)
+int __init spi_eeprom_register(int busid, int chipid, int size)
 {
-	static struct spi_eeprom eeprom = {
-		.name = "at250x0",
-		.byte_len = 128,
-		.page_size = AT250X0_PAGE_SIZE,
-		.flags = EE_ADDR1,
-	};
 	struct spi_board_info info = {
 		.modalias = "at25",
 		.max_speed_hz = 1500000,	/* 1.5Mbps */
-		.bus_num = 0,
+		.bus_num = busid,
 		.chip_select = chipid,
-		.platform_data = &eeprom,
 		/* Mode 0: High-Active, Sample-Then-Shift */
 	};
-
+	struct spi_eeprom *eeprom;
+	eeprom = kzalloc(sizeof(*eeprom), GFP_KERNEL);
+	if (!eeprom)
+		return -ENOMEM;
+	strcpy(eeprom->name, "at250x0");
+	eeprom->byte_len = size;
+	eeprom->page_size = AT250X0_PAGE_SIZE;
+	eeprom->flags = EE_ADDR1;
+	info.platform_data = eeprom;
 	return spi_register_board_info(&info, 1);
 }
 
 /* simple temporary spi driver to provide early access to seeprom. */
 
 static struct read_param {
+	int busid;
 	int chipid;
 	int address;
 	unsigned char *buf;
@@ -57,7 +59,8 @@ static int __init early_seeprom_probe(struct spi_device *spi)
 
 	dev_info(&spi->dev, "spiclk %u KHz.\n",
 		 (spi->max_speed_hz + 500) / 1000);
-	if (read_param->chipid != spi->chip_select)
+	if (read_param->busid != spi->master->bus_num ||
+	    read_param->chipid != spi->chip_select)
 		return -ENODEV;
 	while (len > 0) {
 		/* spi_write_then_read can only work with small chunk */
@@ -80,11 +83,12 @@ static struct spi_driver early_seeprom_driver __initdata = {
 	.probe	= early_seeprom_probe,
 };
 
-int __init spi_eeprom_read(int chipid, int address,
+int __init spi_eeprom_read(int busid, int chipid, int address,
 			   unsigned char *buf, int len)
 {
 	int ret;
 	struct read_param param = {
+		.busid = busid,
 		.chipid = chipid,
 		.address = address,
 		.buf = buf,

arch/mips/txx9/rbtx4938/Makefile

@@ -1,3 +1,3 @@
-obj-y	+= prom.o setup.o irq.o spi_eeprom.o
+obj-y	+= prom.o setup.o irq.o
 
 EXTRA_CFLAGS += -Werror

arch/mips/txx9/rbtx4938/setup.c

@@ -111,6 +111,7 @@ static void __init rbtx4938_pci_setup(void)
 #define	SEEPROM2_CS	0	/* IOC */
 #define	SEEPROM3_CS	1	/* IOC */
 #define	SRTC_CS	2	/* IOC */
+#define SPI_BUSNO	0
 
 static int __init rbtx4938_ethaddr_init(void)
 {
@@ -120,7 +121,7 @@ static int __init rbtx4938_ethaddr_init(void)
 	int i;
 
 	/* 0-3: "MAC\0", 4-9:eth0, 10-15:eth1, 16:sum */
-	if (spi_eeprom_read(SEEPROM1_CS, 0, dat, sizeof(dat))) {
+	if (spi_eeprom_read(SPI_BUSNO, SEEPROM1_CS, 0, dat, sizeof(dat))) {
 		printk(KERN_ERR "seeprom: read error.\n");
 		return -ENODEV;
 	} else {
@@ -287,9 +288,9 @@ static int __init rbtx4938_spi_init(void)
 		.mode = SPI_MODE_1 | SPI_CS_HIGH,
 	};
 	spi_register_board_info(&srtc_info, 1);
-	spi_eeprom_register(SEEPROM1_CS);
+	spi_eeprom_register(SPI_BUSNO, SEEPROM1_CS, 128);
-	spi_eeprom_register(16 + SEEPROM2_CS);
+	spi_eeprom_register(SPI_BUSNO, 16 + SEEPROM2_CS, 128);
-	spi_eeprom_register(16 + SEEPROM3_CS);
+	spi_eeprom_register(SPI_BUSNO, 16 + SEEPROM3_CS, 128);
 	gpio_request(16 + SRTC_CS, "rtc-rs5c348");
 	gpio_direction_output(16 + SRTC_CS, 0);
 	gpio_request(SEEPROM1_CS, "seeprom1");
@@ -298,7 +299,7 @@ static int __init rbtx4938_spi_init(void)
 	gpio_direction_output(16 + SEEPROM2_CS, 1);
 	gpio_request(16 + SEEPROM3_CS, "seeprom3");
 	gpio_direction_output(16 + SEEPROM3_CS, 1);
-	tx4938_spi_init(0);
+	tx4938_spi_init(SPI_BUSNO);
 	return 0;
 }
 

include/asm-mips/txx9/spi.h

@@ -13,7 +13,22 @@
 #ifndef __ASM_TXX9_SPI_H
 #define __ASM_TXX9_SPI_H
 
-extern int spi_eeprom_register(int chipid);
+#include <linux/errno.h>
-extern int spi_eeprom_read(int chipid, int address, unsigned char *buf, int len);
+
+#ifdef CONFIG_SPI
+int spi_eeprom_register(int busid, int chipid, int size);
+int spi_eeprom_read(int busid, int chipid,
+		    int address, unsigned char *buf, int len);
+#else
+static inline int spi_eeprom_register(int busid, int chipid, int size)
+{
+	return -ENODEV;
+}
+static inline int spi_eeprom_read(int busid, int chipid,
+				  int address, unsigned char *buf, int len)
+{
+	return -ENODEV;
+}
+#endif
 
 #endif /* __ASM_TXX9_SPI_H */