[PATCH 01/12] Blackfin arch: add peripheral resource allocation support

From: Bryan Wu
Date: Tue Aug 07 2007 - 23:38:43 EST

From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>

Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
Signed-off-by: Bryan Wu <bryan.wu@xxxxxxxxxx>
---
arch/blackfin/kernel/bfin_gpio.c | 272 ++++++++++++++++++---
include/asm-blackfin/mach-bf533/bfin_serial_5xx.h | 11 +-
include/asm-blackfin/mach-bf537/bfin_serial_5xx.h | 23 +-
include/asm-blackfin/mach-bf537/portmux.h | 2 +-
include/asm-blackfin/mach-bf561/bfin_serial_5xx.h | 11 +-
5 files changed, 274 insertions(+), 45 deletions(-)

diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
index bafcfa5..9f30948 100644
--- a/arch/blackfin/kernel/bfin_gpio.c
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -84,6 +84,7 @@
#include <linux/err.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
+#include <asm/portmux.h>
#include <linux/irq.h>

#ifdef BF533_FAMILY
@@ -115,7 +116,11 @@ static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
};
#endif

-static unsigned short reserved_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+static unsigned short reserved_peri_map[gpio_bank(MAX_BLACKFIN_GPIOS + 16)];
+char *str_ident = NULL;
+
+#define RESOURCE_LABEL_SIZE 16

#ifdef CONFIG_PM
static unsigned short wakeup_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
@@ -143,13 +148,39 @@ inline int check_gpio(unsigned short gpio)
return 0;
}

+static void set_label(unsigned short ident, const char *label)
+{
+
+ if (label && str_ident) {
+ strncpy(str_ident + ident * RESOURCE_LABEL_SIZE, label,
+ RESOURCE_LABEL_SIZE);
+ str_ident[ident * RESOURCE_LABEL_SIZE +
+ RESOURCE_LABEL_SIZE - 1] = 0;
+ }
+}
+
+static char *get_label(unsigned short ident)
+{
+ if (!str_ident)
+ return "UNKNOWN";
+
+ return (str_ident[ident * RESOURCE_LABEL_SIZE] ?
+ (str_ident + ident * RESOURCE_LABEL_SIZE) : "UNKNOWN");
+}
+
+static int cmp_label(unsigned short ident, const char *label)
+{
+ if (label && str_ident)
+ return strncmp(str_ident + ident * RESOURCE_LABEL_SIZE,
+ label, strlen(label));
+ else
+ return -EINVAL;
+}
+
#ifdef BF537_FAMILY
static void port_setup(unsigned short gpio, unsigned short usage)
{
if (usage == GPIO_USAGE) {
- if (*port_fer[gpio_bank(gpio)] & gpio_bit(gpio))
- printk(KERN_WARNING "bfin-gpio: Possible Conflict with Peripheral "
- "usage and GPIO %d detected!\n", gpio);
*port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
} else
*port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
@@ -159,6 +190,56 @@ static void port_setup(unsigned short gpio, unsigned short usage)
# define port_setup(...) do { } while (0)
#endif

+#ifdef BF537_FAMILY
+
+#define PMUX_LUT_RES 0
+#define PMUX_LUT_OFFSET 1
+#define PMUX_LUT_ENTRIES 41
+#define PMUX_LUT_SIZE 2
+
+static unsigned short port_mux_lut[PMUX_LUT_ENTRIES][PMUX_LUT_SIZE] = {
+ {P_PPI0_D13, 11}, {P_PPI0_D14, 11}, {P_PPI0_D15, 11},
+ {P_SPORT1_TFS, 11}, {P_SPORT1_TSCLK, 11}, {P_SPORT1_DTPRI, 11},
+ {P_PPI0_D10, 10}, {P_PPI0_D11, 10}, {P_PPI0_D12, 10},
+ {P_SPORT1_RSCLK, 10}, {P_SPORT1_RFS, 10}, {P_SPORT1_DRPRI, 10},
+ {P_PPI0_D8, 9}, {P_PPI0_D9, 9}, {P_SPORT1_DRSEC, 9},
+ {P_SPORT1_DTSEC, 9}, {P_TMR2, 8}, {P_PPI0_FS3, 8}, {P_TMR3, 7},
+ {P_SPI0_SSEL4, 7}, {P_TMR4, 6}, {P_SPI0_SSEL5, 6}, {P_TMR5, 5},
+ {P_SPI0_SSEL6, 5}, {P_UART1_RX, 4}, {P_UART1_TX, 4}, {P_TMR6, 4},
+ {P_TMR7, 4}, {P_UART0_RX, 3}, {P_UART0_TX, 3}, {P_DMAR0, 3},
+ {P_DMAR1, 3}, {P_SPORT0_DTSEC, 1}, {P_SPORT0_DRSEC, 1},
+ {P_CAN0_RX, 1}, {P_CAN0_TX, 1}, {P_SPI0_SSEL7, 1},
+ {P_SPORT0_TFS, 0}, {P_SPORT0_DTPRI, 0}, {P_SPI0_SSEL2, 0},
+ {P_SPI0_SSEL3, 0}
+};
+
+static void portmux_setup(unsigned short per, unsigned short function)
+{
+ u16 y, muxreg, offset;
+
+ for (y = 0; y < PMUX_LUT_ENTRIES; y++) {
+ if (port_mux_lut[y][PMUX_LUT_RES] == per) {
+
+ /* SET PORTMUX REG */
+
+ offset = port_mux_lut[y][PMUX_LUT_OFFSET];
+ muxreg = bfin_read_PORT_MUX();
+
+ if (offset != 1) {
+ muxreg &= ~(1 << offset);
+ } else {
+ muxreg &= ~(3 << 1);
+ }
+
+ muxreg |= (function << offset);
+ bfin_write_PORT_MUX(muxreg);
+ }
+ }
+}
+
+#else
+# define portmux_setup(...) do { } while (0)
+#endif

static void default_gpio(unsigned short gpio)
{
@@ -179,22 +260,15 @@ static void default_gpio(unsigned short gpio)

static int __init bfin_gpio_init(void)
{
- int i;
-
- printk(KERN_INFO "Blackfin GPIO Controller\n");

- for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE)
- reserved_map[gpio_bank(i)] = 0;
+ str_ident = kzalloc(RESOURCE_LABEL_SIZE * 256, GFP_KERNEL);
+ if (!str_ident)
+ return -ENOMEM;

-#if defined(BF537_FAMILY) && (defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
-# if defined(CONFIG_BFIN_MAC_RMII)
- reserved_map[gpio_bank(PORT_H)] = 0xC373;
-# else
- reserved_map[gpio_bank(PORT_H)] = 0xFFFF;
-# endif
-#endif
+ printk(KERN_INFO "Blackfin GPIO Controller\n");

return 0;
+
}

arch_initcall(bfin_gpio_init);
@@ -223,7 +297,7 @@ arch_initcall(bfin_gpio_init);
void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
{ \
unsigned long flags; \
- BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
local_irq_save(flags); \
if (arg) \
gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
@@ -243,7 +317,7 @@ SET_GPIO(both)
#define SET_GPIO_SC(name) \
void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
{ \
- BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
if (arg) \
gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
else \
@@ -258,7 +332,7 @@ SET_GPIO_SC(maskb)
void set_gpio_data(unsigned short gpio, unsigned short arg)
{
unsigned long flags;
- BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
if (arg)
gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
@@ -277,7 +351,7 @@ SET_GPIO_SC(data)
void set_gpio_toggle(unsigned short gpio)
{
unsigned long flags;
- BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
bfin_read_CHIPID();
@@ -286,7 +360,7 @@ void set_gpio_toggle(unsigned short gpio)
#else
void set_gpio_toggle(unsigned short gpio)
{
- BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
}
#endif
@@ -350,7 +424,7 @@ unsigned short get_gpio_data(unsigned short gpio)
{
unsigned long flags;
unsigned short ret;
- BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->data >> gpio_sub_n(gpio));
bfin_read_CHIPID();
@@ -494,13 +568,14 @@ u32 gpio_pm_setup(void)
gpio_bank_saved[bank].dir = gpio_bankb[bank]->dir;
gpio_bank_saved[bank].edge = gpio_bankb[bank]->edge;
gpio_bank_saved[bank].both = gpio_bankb[bank]->both;
- gpio_bank_saved[bank].reserved = reserved_map[bank];
+ gpio_bank_saved[bank].reserved =
+ reserved_gpio_map[bank];

gpio = i;

while (mask) {
if (mask & 1) {
- reserved_map[gpio_bank(gpio)] |=
+ reserved_gpio_map[gpio_bank(gpio)] |=
gpio_bit(gpio);
bfin_gpio_wakeup_type(gpio,
wakeup_flags_map[gpio]);
@@ -540,7 +615,8 @@ void gpio_pm_restore(void)
gpio_bankb[bank]->edge = gpio_bank_saved[bank].edge;
gpio_bankb[bank]->both = gpio_bank_saved[bank].both;

- reserved_map[bank] = gpio_bank_saved[bank].reserved;
+ reserved_gpio_map[bank] =
+ gpio_bank_saved[bank].reserved;

}

@@ -550,6 +626,140 @@ void gpio_pm_restore(void)

#endif

+
+
+
+int peripheral_request(unsigned short per, const char *label)
+{
+ unsigned long flags;
+ unsigned short ident = P_IDENT(per);
+
+ /*
+ * Don't cares are pins with only one dedicated function
+ */
+
+ if (per & P_DONTCARE)
+ return 0;
+
+ if (!(per & P_DEFINED))
+ return -ENODEV;
+
+ if (check_gpio(ident) < 0)
+ return -EINVAL;
+
+ local_irq_save(flags);
+
+ if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
+ printk(KERN_ERR
+ "%s: Peripheral %d is already reserved as GPIO by %s !\n",
+ __FUNCTION__, ident, get_label(ident));
+ dump_stack();
+ local_irq_restore(flags);
+ return -EBUSY;
+ }
+
+ if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
+
+ /*
+ * Pin functions like AMC address strobes my
+ * be requested and used by several drivers
+ */
+
+ if (!(per & P_MAYSHARE)) {
+
+ /*
+ * Allow that the identical pin function can
+ * be requested from the same driver twice
+ */
+
+ if (cmp_label(ident, label) == 0)
+ goto anyway;
+
+ printk(KERN_ERR
+ "%s: Peripheral %d function %d is already"
+ "reserved by %s !\n",
+ __FUNCTION__, ident, P_FUNCT2MUX(per),
+ get_label(ident));
+ dump_stack();
+ local_irq_restore(flags);
+ return -EBUSY;
+ }
+
+ }
+
+anyway:
+
+
+ portmux_setup(per, P_FUNCT2MUX(per));
+
+ port_setup(ident, PERIPHERAL_USAGE);
+
+ reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
+ local_irq_restore(flags);
+ set_label(ident, label);
+
+ return 0;
+}
+EXPORT_SYMBOL(peripheral_request);
+
+int peripheral_request_list(unsigned short per[], const char *label)
+{
+ u16 cnt;
+ int ret;
+
+ for (cnt = 0; per[cnt] != 0; cnt++) {
+ ret = peripheral_request(per[cnt], label);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(peripheral_request_list);
+
+void peripheral_free(unsigned short per)
+{
+ unsigned long flags;
+ unsigned short ident = P_IDENT(per);
+
+ if (per & P_DONTCARE)
+ return;
+
+ if (!(per & P_DEFINED))
+ return;
+
+ if (check_gpio(ident) < 0)
+ return;
+
+ local_irq_save(flags);
+
+ if (unlikely(!(reserved_peri_map[gpio_bank(ident)]
+ & gpio_bit(ident)))) {
+ local_irq_restore(flags);
+ return;
+ }
+
+ if (!(per & P_MAYSHARE)) {
+ port_setup(ident, GPIO_USAGE);
+ }
+
+ reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);
+
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(peripheral_free);
+
+void peripheral_free_list(unsigned short per[])
+{
+ u16 cnt;
+
+ for (cnt = 0; per[cnt] != 0; cnt++) {
+ peripheral_free(per[cnt]);
+ }
+
+}
+EXPORT_SYMBOL(peripheral_free_list);
+
/***********************************************************
*
* FUNCTIONS: Blackfin GPIO Driver
@@ -574,13 +784,13 @@ int gpio_request(unsigned short gpio, const char *label)

local_irq_save(flags);

- if (unlikely(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
+ if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio);
dump_stack();
local_irq_restore(flags);
return -EBUSY;
}
- reserved_map[gpio_bank(gpio)] |= gpio_bit(gpio);
+ reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);

local_irq_restore(flags);

@@ -599,7 +809,7 @@ void gpio_free(unsigned short gpio)

local_irq_save(flags);

- if (unlikely(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
+ if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
dump_stack();
local_irq_restore(flags);
@@ -608,7 +818,7 @@ void gpio_free(unsigned short gpio)

default_gpio(gpio);

- reserved_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
+ reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);

local_irq_restore(flags);
}
@@ -618,7 +828,7 @@ void gpio_direction_input(unsigned short gpio)
{
unsigned long flags;

- BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));

local_irq_save(flags);
gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
@@ -631,7 +841,7 @@ void gpio_direction_output(unsigned short gpio)
{
unsigned long flags;

- BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+ BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));

local_irq_save(flags);
gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
diff --git a/include/asm-blackfin/mach-bf533/bfin_serial_5xx.h b/include/asm-blackfin/mach-bf533/bfin_serial_5xx.h
index e043caf..69b9f8e 100644
--- a/include/asm-blackfin/mach-bf533/bfin_serial_5xx.h
+++ b/include/asm-blackfin/mach-bf533/bfin_serial_5xx.h
@@ -1,5 +1,6 @@
#include <linux/serial.h>
#include <asm/dma.h>
+#include <asm/portmux.h>

#define NR_PORTS 1

@@ -92,18 +93,24 @@ struct bfin_serial_res bfin_serial_resource[] = {
}
};

+#define DRIVER_NAME "bfin-uart"

int nr_ports = NR_PORTS;
static void bfin_serial_hw_init(struct bfin_serial_port *uart)
{

+#ifdef CONFIG_SERIAL_BFIN_UART0
+ peripheral_request(P_UART0_TX, DRIVER_NAME);
+ peripheral_request(P_UART0_RX, DRIVER_NAME);
+#endif
+
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0) {
- gpio_request(uart->cts_pin, NULL);
+ gpio_request(uart->cts_pin, DRIVER_NAME);
gpio_direction_input(uart->cts_pin);
}
if (uart->rts_pin >= 0) {
- gpio_request(uart->rts_pin, NULL);
+ gpio_request(uart->rts_pin, DRIVER_NAME);
gpio_direction_input(uart->rts_pin);
}
#endif
diff --git a/include/asm-blackfin/mach-bf537/bfin_serial_5xx.h b/include/asm-blackfin/mach-bf537/bfin_serial_5xx.h
index 8f5d9c4..6fb328f 100644
--- a/include/asm-blackfin/mach-bf537/bfin_serial_5xx.h
+++ b/include/asm-blackfin/mach-bf537/bfin_serial_5xx.h
@@ -1,5 +1,6 @@
#include <linux/serial.h>
#include <asm/dma.h>
+#include <asm/portmux.h>

#define NR_PORTS 2

@@ -122,25 +123,29 @@ struct bfin_serial_res bfin_serial_resource[] = {

int nr_ports = ARRAY_SIZE(bfin_serial_resource);

+#define DRIVER_NAME "bfin-uart"
+
static void bfin_serial_hw_init(struct bfin_serial_port *uart)
{
- unsigned short val;
- val = bfin_read16(BFIN_PORT_MUX);
- val &= ~(PFDE | PFTE);
- bfin_write16(BFIN_PORT_MUX, val);

- val = bfin_read16(PORTF_FER);
- val |= 0xF;
- bfin_write16(PORTF_FER, val);
+#ifdef CONFIG_SERIAL_BFIN_UART0
+ peripheral_request(P_UART0_TX, DRIVER_NAME);
+ peripheral_request(P_UART0_RX, DRIVER_NAME);
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_UART1
+ peripheral_request(P_UART1_TX, DRIVER_NAME);
+ peripheral_request(P_UART1_RX, DRIVER_NAME);
+#endif

#ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0) {
- gpio_request(uart->cts_pin, NULL);
+ gpio_request(uart->cts_pin, DRIVER_NAME);
gpio_direction_input(uart->cts_pin);
}

if (uart->rts_pin >= 0) {
- gpio_request(uart->rts_pin, NULL);
+ gpio_request(uart->rts_pin, DRIVER_NAME);
gpio_direction_output(uart->rts_pin);
}
#endif
diff --git a/include/asm-blackfin/mach-bf537/portmux.h b/include/asm-blackfin/mach-bf537/portmux.h
index 23e13c5..7daa247 100644
--- a/include/asm-blackfin/mach-bf537/portmux.h
+++ b/include/asm-blackfin/mach-bf537/portmux.h
@@ -106,4 +106,4 @@
#define P_SPI0_SSEL2 (P_DEFINED | P_IDENT(PORT_PJ11) | P_FUNCT(1))
#define P_SPI0_SSEL7 (P_DEFINED | P_IDENT(PORT_PJ5) | P_FUNCT(2))

-#endif /* _MACH_PORTMUX_H_ */
+#endif /* _MACH_PORTMUX_H_ */
diff --git a/include/asm-blackfin/mach-bf561/bfin_serial_5xx.h b/include/asm-blackfin/mach-bf561/bfin_serial_5xx.h
index e043caf..69b9f8e 100644
--- a/include/asm-blackfin/mach-bf561/bfin_serial_5xx.h
+++ b/include/asm-blackfin/mach-bf561/bfin_serial_5xx.h
@@ -1,5 +1,6 @@
#include <linux/serial.h>
#include <asm/dma.h>
+#include <asm/portmux.h>

#define NR_PORTS 1

@@ -92,18 +93,24 @@ struct bfin_serial_res bfin_serial_resource[] = {
}
};

+#define DRIVER_NAME "bfin-uart"

int nr_ports = NR_PORTS;
static void bfin_serial_hw_init(struct bfin_serial_port *uart)
{

+#ifdef CONFIG_SERIAL_BFIN_UART0
+ peripheral_request(P_UART0_TX, DRIVER_NAME);
+ peripheral_request(P_UART0_RX, DRIVER_NAME);
+#endif
+
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0) {
- gpio_request(uart->cts_pin, NULL);
+ gpio_request(uart->cts_pin, DRIVER_NAME);
gpio_direction_input(uart->cts_pin);
}
if (uart->rts_pin >= 0) {
- gpio_request(uart->rts_pin, NULL);
+ gpio_request(uart->rts_pin, DRIVER_NAME);
gpio_direction_input(uart->rts_pin);
}
#endif
--
1.5.2
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