#include <linux/spinlock.h>
#include <linux/string.h>
-/*
- * MAX_NR_HW_GPIO represents the number of actual hardware-supported GPIOs (ie,
- * slots within the clocked serial GPIO data). Since each HW GPIO is both an
- * input and an output, we provide MAX_NR_HW_GPIO * 2 lines on our gpiochip
- * device.
- *
- * We use SGPIO_OUTPUT_OFFSET to define the split between the inputs and
- * outputs; the inputs start at line 0, the outputs start at OUTPUT_OFFSET.
- */
-#define MAX_NR_HW_SGPIO 80
-#define SGPIO_OUTPUT_OFFSET MAX_NR_HW_SGPIO
-
#define ASPEED_SGPIO_CTRL 0x54
-#define ASPEED_SGPIO_PINS_MASK GENMASK(9, 6)
#define ASPEED_SGPIO_CLK_DIV_MASK GENMASK(31, 16)
#define ASPEED_SGPIO_ENABLE BIT(0)
+#define ASPEED_SGPIO_PINS_SHIFT 6
+
+struct aspeed_sgpio_pdata {
+ const u32 pin_mask;
+};
struct aspeed_sgpio {
struct gpio_chip chip;
spinlock_t lock;
void __iomem *base;
int irq;
- int n_sgpio;
};
struct aspeed_sgpio_bank {
.val_regs = 0x0038,
.rdata_reg = 0x0078,
.irq_regs = 0x003C,
- .names = { "I", "J" },
+ .names = { "I", "J", "K", "L" },
+ },
+ {
+ .val_regs = 0x0090,
+ .rdata_reg = 0x007C,
+ .irq_regs = 0x0094,
+ .names = { "M", "N", "O", "P" },
},
};
}
}
-#define GPIO_BANK(x) ((x % SGPIO_OUTPUT_OFFSET) >> 5)
-#define GPIO_OFFSET(x) ((x % SGPIO_OUTPUT_OFFSET) & 0x1f)
-#define GPIO_BIT(x) BIT(GPIO_OFFSET(x))
+#define GPIO_BANK(x) ((x) >> 6)
+#define GPIO_OFFSET(x) ((x) & GENMASK(5, 0))
+#define GPIO_BIT(x) BIT(GPIO_OFFSET(x) >> 1)
static const struct aspeed_sgpio_bank *to_bank(unsigned int offset)
{
static int aspeed_sgpio_init_valid_mask(struct gpio_chip *gc,
unsigned long *valid_mask, unsigned int ngpios)
{
- struct aspeed_sgpio *sgpio = gpiochip_get_data(gc);
- int n = sgpio->n_sgpio;
- int c = SGPIO_OUTPUT_OFFSET - n;
-
- WARN_ON(ngpios < MAX_NR_HW_SGPIO * 2);
-
- /* input GPIOs in the lower range */
- bitmap_set(valid_mask, 0, n);
- bitmap_clear(valid_mask, n, c);
-
- /* output GPIOS above SGPIO_OUTPUT_OFFSET */
- bitmap_set(valid_mask, SGPIO_OUTPUT_OFFSET, n);
- bitmap_clear(valid_mask, SGPIO_OUTPUT_OFFSET + n, c);
-
+ bitmap_set(valid_mask, 0, ngpios);
return 0;
}
static void aspeed_sgpio_irq_init_valid_mask(struct gpio_chip *gc,
unsigned long *valid_mask, unsigned int ngpios)
{
- struct aspeed_sgpio *sgpio = gpiochip_get_data(gc);
- int n = sgpio->n_sgpio;
+ unsigned int i;
- WARN_ON(ngpios < MAX_NR_HW_SGPIO * 2);
-
- /* input GPIOs in the lower range */
- bitmap_set(valid_mask, 0, n);
- bitmap_clear(valid_mask, n, ngpios - n);
+ /* input GPIOs are even bits */
+ for (i = 0; i < ngpios; i++) {
+ if (i % 2)
+ clear_bit(i, valid_mask);
+ }
}
static bool aspeed_sgpio_is_input(unsigned int offset)
{
- return offset < SGPIO_OUTPUT_OFFSET;
+ return !(offset % 2);
}
static int aspeed_sgpio_get(struct gpio_chip *gc, unsigned int offset)
return 0;
}
+static const struct aspeed_sgpio_pdata ast2400_sgpio_pdata = {
+ .pin_mask = GENMASK(9, 6),
+};
+
+static const struct aspeed_sgpio_pdata ast2600_sgpiom_pdata = {
+ .pin_mask = GENMASK(10, 6),
+};
+
static const struct of_device_id aspeed_sgpio_of_table[] = {
- { .compatible = "aspeed,ast2400-sgpio" },
- { .compatible = "aspeed,ast2500-sgpio" },
+ { .compatible = "aspeed,ast2400-sgpio", .data = &ast2400_sgpio_pdata, },
+ { .compatible = "aspeed,ast2500-sgpio", .data = &ast2400_sgpio_pdata, },
+ { .compatible = "aspeed,ast2600-sgpiom", .data = &ast2600_sgpiom_pdata, },
{}
};
static int __init aspeed_sgpio_probe(struct platform_device *pdev)
{
+ u32 nr_gpios, sgpio_freq, sgpio_clk_div, gpio_cnt_regval, pin_mask;
+ const struct aspeed_sgpio_pdata *pdata;
struct aspeed_sgpio *gpio;
- u32 nr_gpios, sgpio_freq, sgpio_clk_div;
- int rc;
unsigned long apb_freq;
+ int rc;
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
if (!gpio)
if (IS_ERR(gpio->base))
return PTR_ERR(gpio->base);
+ pdata = device_get_match_data(&pdev->dev);
+ if (!pdata)
+ return -EINVAL;
+
+ pin_mask = pdata->pin_mask;
+
rc = of_property_read_u32(pdev->dev.of_node, "ngpios", &nr_gpios);
if (rc < 0) {
dev_err(&pdev->dev, "Could not read ngpios property\n");
return -EINVAL;
- } else if (nr_gpios > MAX_NR_HW_SGPIO) {
- dev_err(&pdev->dev, "Number of GPIOs exceeds the maximum of %d: %d\n",
- MAX_NR_HW_SGPIO, nr_gpios);
- return -EINVAL;
}
- gpio->n_sgpio = nr_gpios;
rc = of_property_read_u32(pdev->dev.of_node, "bus-frequency", &sgpio_freq);
if (rc < 0) {
if (sgpio_clk_div > (1 << 16) - 1)
return -EINVAL;
- iowrite32(FIELD_PREP(ASPEED_SGPIO_CLK_DIV_MASK, sgpio_clk_div) |
- FIELD_PREP(ASPEED_SGPIO_PINS_MASK, (nr_gpios / 8)) |
- ASPEED_SGPIO_ENABLE,
- gpio->base + ASPEED_SGPIO_CTRL);
+ gpio_cnt_regval = ((nr_gpios / 8) << ASPEED_SGPIO_PINS_SHIFT) & pin_mask;
+ iowrite32(FIELD_PREP(ASPEED_SGPIO_CLK_DIV_MASK, sgpio_clk_div) | gpio_cnt_regval |
+ ASPEED_SGPIO_ENABLE, gpio->base + ASPEED_SGPIO_CTRL);
spin_lock_init(&gpio->lock);
gpio->chip.parent = &pdev->dev;
- gpio->chip.ngpio = MAX_NR_HW_SGPIO * 2;
+ gpio->chip.ngpio = nr_gpios * 2;
gpio->chip.init_valid_mask = aspeed_sgpio_init_valid_mask;
gpio->chip.direction_input = aspeed_sgpio_dir_in;
gpio->chip.direction_output = aspeed_sgpio_dir_out;
projects / linux-2.6-microblaze.git / blobdiff