From d135d94b3d1fe599d13e7198d5f502912d694c13 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Sun, 3 Jul 2011 15:00:38 +0200
Subject: [PATCH 29/60] MIPS: BCM63XX: Register SPI flash if present
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
arch/mips/bcm63xx/dev-flash.c | 35 +++++++++++++++++++-
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h | 2 +
2 files changed, 33 insertions(+), 2 deletions(-)
--- a/arch/mips/bcm63xx/dev-flash.c
+++ b/arch/mips/bcm63xx/dev-flash.c
@@ -17,6 +17,9 @@
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>
#include <linux/mtd/spi-nor.h>
+#include <linux/of.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/flash.h>
#include <bcm63xx_cpu.h>
#include <bcm63xx_dev_flash.h>
@@ -66,6 +69,41 @@ void __init bcm63xx_flash_force_phys_bas
mtd_resources[0].end = end;
}
+static struct spi_board_info bcm63xx_spi_flash_info[] = {
+ {
+ .bus_num = 0,
+ .chip_select = 0,
+ .mode = 0,
+ .max_speed_hz = 781000,
+ .modalias = "m25p80",
+ },
+};
+
+static void bcm63xx_of_update_spi_flash_speed(struct device_node *np,
+ unsigned int new_hz)
+{
+ struct property *max_hz;
+ __be32 *hz;
+
+ max_hz = kzalloc(sizeof(*max_hz) + sizeof(*hz), GFP_KERNEL);
+ if (!max_hz)
+ return;
+
+ max_hz->name = kstrdup("spi-max-frequency", GFP_KERNEL);
+ if (!max_hz->name) {
+ kfree(max_hz);
+ return;
+ }
+
+ max_hz->value = max_hz + 1;
+ max_hz->length = sizeof(*hz);
+
+ hz = max_hz->value;
+ *hz = cpu_to_be32(new_hz);
+
+ of_update_property(np, max_hz);
+}
+
static int __init bcm63xx_detect_flash_type(void)
{
u32 val;
@@ -73,9 +111,15 @@ static int __init bcm63xx_detect_flash_t
switch (bcm63xx_get_cpu_id()) {
case BCM6318_CPU_ID:
/* only support serial flash */
+ bcm63xx_spi_flash_info[0].max_speed_hz = 62500000;
return BCM63XX_FLASH_TYPE_SERIAL;
case BCM6328_CPU_ID:
val = bcm_misc_readl(MISC_STRAPBUS_6328_REG);
+ if (val & STRAPBUS_6328_HSSPI_CLK_FAST)
+ bcm63xx_spi_flash_info[0].max_speed_hz = 33333334;
+ else
+ bcm63xx_spi_flash_info[0].max_speed_hz = 16666667;
+
if (val & STRAPBUS_6328_BOOT_SEL_SERIAL)
return BCM63XX_FLASH_TYPE_SERIAL;
else
@@ -94,12 +138,20 @@ static int __init bcm63xx_detect_flash_t
return BCM63XX_FLASH_TYPE_SERIAL;
case BCM6362_CPU_ID:
val = bcm_misc_readl(MISC_STRAPBUS_6362_REG);
+ if (val & STRAPBUS_6362_HSSPI_CLK_FAST)
+ bcm63xx_spi_flash_info[0].max_speed_hz = 50000000;
+ else
+ bcm63xx_spi_flash_info[0].max_speed_hz = 20000000;
+
if (val & STRAPBUS_6362_BOOT_SEL_SERIAL)
return BCM63XX_FLASH_TYPE_SERIAL;
else
return BCM63XX_FLASH_TYPE_NAND;
case BCM6368_CPU_ID:
val = bcm_gpio_readl(GPIO_STRAPBUS_REG);
+ if (val & STRAPBUS_6368_SPI_CLK_FAST)
+ bcm63xx_spi_flash_info[0].max_speed_hz = 20000000;
+
switch (val & STRAPBUS_6368_BOOT_SEL_MASK) {
case STRAPBUS_6368_BOOT_SEL_NAND:
return BCM63XX_FLASH_TYPE_NAND;
@@ -110,6 +162,11 @@ static int __init bcm63xx_detect_flash_t
}
case BCM63268_CPU_ID:
val = bcm_misc_readl(MISC_STRAPBUS_63268_REG);
+ if (val & STRAPBUS_63268_HSSPI_CLK_FAST)
+ bcm63xx_spi_flash_info[0].max_speed_hz = 50000000;
+ else
+ bcm63xx_spi_flash_info[0].max_speed_hz = 20000000;
+
if (val & STRAPBUS_63268_BOOT_SEL_SERIAL)
return BCM63XX_FLASH_TYPE_SERIAL;
else
@@ -176,6 +233,7 @@ void __init bcm63xx_flash_detect(void)
int __init bcm63xx_flash_register(void)
{
+ struct device_node *np;
u32 val;
switch (flash_type) {
@@ -195,8 +253,14 @@ int __init bcm63xx_flash_register(void)
return platform_device_register(&mtd_dev);
case BCM63XX_FLASH_TYPE_SERIAL:
- pr_warn("unsupported serial flash detected\n");
- return -ENODEV;
+ np = of_find_compatible_node(NULL, NULL, "jedec,spi-nor");
+ if (np) {
+ bcm63xx_of_update_spi_flash_speed(np, bcm63xx_spi_flash_info[0].max_speed_hz);
+ of_node_put(np);
+ return 0;
+ } else {
+ return -ENODEV;
+ }
case BCM63XX_FLASH_TYPE_NAND:
pr_warn("unsupported NAND flash detected\n");
return -ENODEV;
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
@@ -709,6 +709,7 @@
#define GPIO_STRAPBUS_REG 0x40
#define STRAPBUS_6358_BOOT_SEL_PARALLEL (1 << 1)
#define STRAPBUS_6358_BOOT_SEL_SERIAL (0 << 1)
+#define STRAPBUS_6368_SPI_CLK_FAST (1 << 6)
#define STRAPBUS_6368_BOOT_SEL_MASK 0x3
#define STRAPBUS_6368_BOOT_SEL_NAND 0
#define STRAPBUS_6368_BOOT_SEL_SERIAL 1
@@ -1565,6 +1566,7 @@
#define IDDQ_CTRL_63268_USBH (1 << 4)
#define MISC_STRAPBUS_6328_REG 0x240
+#define STRAPBUS_6328_HSSPI_CLK_FAST (1 << 4)
#define STRAPBUS_6328_FCVO_SHIFT 7
#define STRAPBUS_6328_FCVO_MASK (0x1f << STRAPBUS_6328_FCVO_SHIFT)
#define STRAPBUS_6328_BOOT_SEL_SERIAL (1 << 28)