[PATCH 10/12] usb: gadget: at91_udc: Rework for multi-platform kernel support

From: Alexandre Belloni
Date: Wed Jan 14 2015 - 11:23:11 EST

From: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>

cpu_is_at91xxx are a set of macros defined in mach/cpu.h and are here used
to detect the SoC we are booting on.
Use compatible string + a caps structure to replace those cpu_is_xxx tests.

Remove all mach and asm headers (which are now unused).

Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/udc/at91_udc.c | 288 ++++++++++++++++++++++++++++----------
drivers/usb/gadget/udc/at91_udc.h | 7 +
2 files changed, 218 insertions(+), 77 deletions(-)

diff --git a/drivers/usb/gadget/udc/at91_udc.c b/drivers/usb/gadget/udc/at91_udc.c
index 4dba2c65dfd4..c0abb9bc76a9 100644
--- a/drivers/usb/gadget/udc/at91_udc.c
+++ b/drivers/usb/gadget/udc/at91_udc.c
@@ -31,16 +31,9 @@
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_data/atmel.h>
-
-#include <asm/byteorder.h>
-#include <mach/hardware.h>
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/gpio.h>
-
-#include <mach/cpu.h>
-#include <mach/at91sam9261_matrix.h>
-#include <mach/at91_matrix.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/atmel-matrix.h>

#include "at91_udc.h"

@@ -915,8 +908,6 @@ static void clk_off(struct at91_udc *udc)
*/
static void pullup(struct at91_udc *udc, int is_on)
{
- int active = !udc->board.pullup_active_low;
-
if (!udc->enabled || !udc->vbus)
is_on = 0;
DBG("%sactive\n", is_on ? "" : "in");
@@ -925,40 +916,15 @@ static void pullup(struct at91_udc *udc, int is_on)
clk_on(udc);
at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
at91_udp_write(udc, AT91_UDP_TXVC, 0);
- if (cpu_is_at91rm9200())
- gpio_set_value(udc->board.pullup_pin, active);
- else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
- u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
-
- txvc |= AT91_UDP_TXVC_PUON;
- at91_udp_write(udc, AT91_UDP_TXVC, txvc);
- } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
- u32 usbpucr;
-
- usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR);
- usbpucr |= AT91_MATRIX_USBPUCR_PUON;
- at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr);
- }
} else {
stop_activity(udc);
at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
- if (cpu_is_at91rm9200())
- gpio_set_value(udc->board.pullup_pin, !active);
- else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
- u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
-
- txvc &= ~AT91_UDP_TXVC_PUON;
- at91_udp_write(udc, AT91_UDP_TXVC, txvc);
- } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
- u32 usbpucr;
-
- usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR);
- usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
- at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr);
- }
clk_off(udc);
}
+
+ if (udc->caps && udc->caps->pullup)
+ udc->caps->pullup(udc, is_on);
}

/* vbus is here! turn everything on that's ready */
@@ -1683,12 +1649,202 @@ static void at91udc_shutdown(struct platform_device *dev)
spin_unlock_irqrestore(&udc->lock, flags);
}

-static void at91udc_of_init(struct at91_udc *udc,
- struct device_node *np)
+static int at91rm9200_udc_init(struct at91_udc *udc)
+{
+ struct at91_ep *ep;
+ int ret;
+ int i;
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+
+ switch (i) {
+ case 0:
+ case 3:
+ ep->maxpacket = 8;
+ break;
+ case 1 ... 2:
+ ep->maxpacket = 64;
+ break;
+ case 4 ... 5:
+ ep->maxpacket = 256;
+ break;
+ }
+ }
+
+ if (!gpio_is_valid(udc->board.pullup_pin)) {
+ DBG("no D+ pullup?\n");
+ return -ENODEV;
+ }
+
+ ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin,
+ "udc_pullup");
+ if (ret) {
+ DBG("D+ pullup is busy\n");
+ return ret;
+ }
+
+ gpio_direction_output(udc->board.pullup_pin,
+ udc->board.pullup_active_low);
+
+ return 0;
+}
+
+static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on)
+{
+ int active = !udc->board.pullup_active_low;
+
+ if (is_on)
+ gpio_set_value(udc->board.pullup_pin, active);
+ else
+ gpio_set_value(udc->board.pullup_pin, !active);
+}
+
+static const struct at91_udc_caps at91rm9200_udc_caps = {
+ .init = at91rm9200_udc_init,
+ .pullup = at91rm9200_udc_pullup,
+};
+
+static int at91sam9260_udc_init(struct at91_udc *udc)
+{
+ struct at91_ep *ep;
+ int i;
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+
+ switch (i) {
+ case 0 ... 3:
+ ep->maxpacket = 64;
+ break;
+ case 4 ... 5:
+ ep->maxpacket = 512;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
+{
+ u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
+
+ if (is_on)
+ txvc |= AT91_UDP_TXVC_PUON;
+ else
+ txvc &= ~AT91_UDP_TXVC_PUON;
+
+ at91_udp_write(udc, AT91_UDP_TXVC, txvc);
+}
+
+static const struct at91_udc_caps at91sam9260_udc_caps = {
+ .init = at91sam9260_udc_init,
+ .pullup = at91sam9260_udc_pullup,
+};
+
+static int at91sam9261_udc_init(struct at91_udc *udc)
+{
+ struct at91_ep *ep;
+ int i;
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+
+ switch (i) {
+ case 0:
+ ep->maxpacket = 8;
+ break;
+ case 1 ... 3:
+ ep->maxpacket = 64;
+ break;
+ case 4 ... 5:
+ ep->maxpacket = 256;
+ break;
+ }
+ }
+
+ udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node,
+ "atmel,matrix");
+ if (IS_ERR(udc->matrix))
+ return PTR_ERR(udc->matrix);
+
+ return 0;
+}
+
+static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
+{
+ u32 usbpucr = 0;
+
+ if (is_on)
+ usbpucr = AT91_MATRIX_USBPUCR_PUON;
+
+ regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR,
+ AT91_MATRIX_USBPUCR_PUON, usbpucr);
+}
+
+static const struct at91_udc_caps at91sam9261_udc_caps = {
+ .init = at91sam9261_udc_init,
+ .pullup = at91sam9261_udc_pullup,
+};
+
+static int at91sam9263_udc_init(struct at91_udc *udc)
+{
+ struct at91_ep *ep;
+ int i;
+
+ for (i = 0; i < NUM_ENDPOINTS; i++) {
+ ep = &udc->ep[i];
+
+ switch (i) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ ep->maxpacket = 64;
+ break;
+ case 4:
+ case 5:
+ ep->maxpacket = 256;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static const struct at91_udc_caps at91sam9263_udc_caps = {
+ .init = at91sam9263_udc_init,
+ .pullup = at91sam9260_udc_pullup,
+};
+
+static const struct of_device_id at91_udc_dt_ids[] = {
+ {
+ .compatible = "atmel,at91rm9200-udc",
+ .data = &at91rm9200_udc_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9260-udc",
+ .data = &at91sam9260_udc_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9261-udc",
+ .data = &at91sam9261_udc_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9263-udc",
+ .data = &at91sam9263_udc_caps,
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
+
+static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
{
struct at91_udc_data *board = &udc->board;
- u32 val;
+ const struct of_device_id *match;
enum of_gpio_flags flags;
+ u32 val;

if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
board->vbus_polled = 1;
@@ -1701,6 +1857,10 @@ static void at91udc_of_init(struct at91_udc *udc,
&flags);

board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
+
+ match = of_match_node(at91_udc_dt_ids, np);
+ if (match)
+ udc->caps = match->data;
}

static int at91udc_probe(struct platform_device *pdev)
@@ -1709,6 +1869,8 @@ static int at91udc_probe(struct platform_device *pdev)
struct at91_udc *udc;
int retval;
struct resource *res;
+ struct at91_ep *ep;
+ int i;

/* init software state */
udc = &controller;
@@ -1718,40 +1880,19 @@ static int at91udc_probe(struct platform_device *pdev)
udc->enabled = 0;
spin_lock_init(&udc->lock);

- /* rm9200 needs manual D+ pullup; off by default */
- if (cpu_is_at91rm9200()) {
- if (!gpio_is_valid(udc->board.pullup_pin)) {
- DBG("no D+ pullup?\n");
- return -ENODEV;
- }
- retval = devm_gpio_request(dev, udc->board.pullup_pin,
- "udc_pullup");
- if (retval) {
- DBG("D+ pullup is busy\n");
- return retval;
- }
- gpio_direction_output(udc->board.pullup_pin,
- udc->board.pullup_active_low);
- }

- /* newer chips have more FIFO memory than rm9200 */
- if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
- udc->ep[0].maxpacket = 64;
- udc->ep[3].maxpacket = 64;
- udc->ep[4].maxpacket = 512;
- udc->ep[5].maxpacket = 512;
- } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
- udc->ep[3].maxpacket = 64;
- } else if (cpu_is_at91sam9263()) {
- udc->ep[0].maxpacket = 64;
- udc->ep[3].maxpacket = 64;
- }

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
udc->udp_baseaddr = devm_ioremap_resource(dev, res);
if (IS_ERR(udc->udp_baseaddr))
return PTR_ERR(udc->udp_baseaddr);

+ if (udc->caps && udc->caps->init) {
+ retval = udc->caps->init(udc);
+ if (retval)
+ return retval;
+ }
+
udc_reinit(udc);

/* get interface and function clocks */
@@ -1920,13 +2061,6 @@ static int at91udc_resume(struct platform_device *pdev)
#define at91udc_resume NULL
#endif

-static const struct of_device_id at91_udc_dt_ids[] = {
- { .compatible = "atmel,at91rm9200-udc" },
- { /* sentinel */ }
-};
-
-MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
-
static struct platform_driver at91_udc_driver = {
.remove = __exit_p(at91udc_remove),
.shutdown = at91udc_shutdown,
diff --git a/drivers/usb/gadget/udc/at91_udc.h b/drivers/usb/gadget/udc/at91_udc.h
index e647d1c2ada4..4fc0daa6587f 100644
--- a/drivers/usb/gadget/udc/at91_udc.h
+++ b/drivers/usb/gadget/udc/at91_udc.h
@@ -107,6 +107,11 @@ struct at91_ep {
unsigned fifo_bank:1;
};

+struct at91_udc_caps {
+ int (*init)(struct at91_udc *udc);
+ void (*pullup)(struct at91_udc *udc, int is_on);
+};
+
/*
* driver is non-SMP, and just blocks IRQs whenever it needs
* access protection for chip registers or driver state
@@ -115,6 +120,7 @@ struct at91_udc {
struct usb_gadget gadget;
struct at91_ep ep[NUM_ENDPOINTS];
struct usb_gadget_driver *driver;
+ const struct at91_udc_caps *caps;
unsigned vbus:1;
unsigned enabled:1;
unsigned clocked:1;
@@ -134,6 +140,7 @@ struct at91_udc {
spinlock_t lock;
struct timer_list vbus_timer;
struct work_struct vbus_timer_work;
+ struct regmap *matrix;
};

static inline struct at91_udc *to_udc(struct usb_gadget *g)
--
2.1.0

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