Create a minimal driver out of gpmc code.
Responsibilities handled by earlier gpmc
initialization is now achieved in probe.
Signed-off-by: Afzal Mohammed <afzal@xxxxxx>
---
arch/arm/mach-omap2/gpmc.c | 179 ++++++++++++++++++++++++++++++++------------
1 file changed, 132 insertions(+), 47 deletions(-)
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index f64f55a..08fc5df 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -24,6 +24,7 @@
#include <linux/io.h>
#include <linux/module.h>
#include <linux/interrupt.h>
+#include <linux/platform_device.h>
#include <asm/mach-types.h>
#include <plat/gpmc.h>
@@ -31,6 +32,8 @@
#include <plat/sdrc.h>
+#define DRIVER_NAME "omap-gpmc"
+
/* GPMC register offsets */
#define GPMC_REVISION 0x00
#define GPMC_SYSCONFIG 0x10
@@ -86,6 +89,12 @@
#define ENABLE_PREFETCH (0x1 << 7)
#define DMA_MPU_MODE 2
+#define GPMC_REVISION_MAJOR(l) ((l >> 4) & 0xf)
+#define GPMC_REVISION_MINOR(l) (l & 0xf)
+
+#define GPMC_HAS_WR_ACCESS 0x1
+#define GPMC_HAS_WR_DATA_MUX_BUS 0x2
+
/* XXX: Only NAND irq has been considered,currently these are the only ones used
*/
#define GPMC_NR_IRQ 2
@@ -122,6 +131,21 @@ struct omap3_gpmc_regs {
struct gpmc_cs_config cs_context[GPMC_CS_NUM];
};
+struct gpmc_peripheral {
+ char *name;
+ int id;
+ void *pdata;
+ unsigned pdata_size;
+ struct resource *per_res;
+ unsigned per_res_cnt;
+ struct resource *gpmc_res;
+ unsigned gpmc_res_cnt;
+ bool have_waitpin;
+ bool waitpin_high;
+ unsigned waitpin;
+ struct platform_device *pdev;
+};
+
static struct gpmc_client_irq gpmc_client_irq[GPMC_NR_IRQ];
static struct irq_chip gpmc_irq_chip;
static unsigned gpmc_irq_start;
@@ -131,6 +155,10 @@ static struct resource gpmc_cs_mem[GPMC_CS_NUM];
static DEFINE_SPINLOCK(gpmc_mem_lock);
static unsigned int gpmc_cs_map; /* flag for cs which are initialized */
static int gpmc_ecc_used = -EINVAL; /* cs using ecc engine */
+static struct device *gpmc_dev;
+static u32 gpmc_capability;
+static int gpmc_irq;
+static resource_size_t phys_base, mem_size;
static void __iomem *gpmc_base;
@@ -472,6 +500,19 @@ static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size)
return r;
}
+static int gpmc_cs_delete_mem(int cs)
+{
+ struct resource *res = &gpmc_cs_mem[cs];
+ int r;
+
+ spin_lock(&gpmc_mem_lock);
+ r = release_resource(&gpmc_cs_mem[cs]);
+ res->start = res->end = 0;
+ spin_unlock(&gpmc_mem_lock);
+
+ return r;
+}
+
int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
{
struct resource *res = &gpmc_cs_mem[cs];
@@ -808,7 +849,7 @@ static void gpmc_irq_noop(struct irq_data *data) { }
static unsigned int gpmc_irq_noop_ret(struct irq_data *data) { return 0; }
-static int gpmc_setup_irq(int gpmc_irq)
+static int gpmc_setup_irq(void)
{
int i;
u32 regval;
@@ -852,7 +893,37 @@ static int gpmc_setup_irq(int gpmc_irq)
return request_irq(gpmc_irq, gpmc_handle_irq, 0, "gpmc", NULL);
}
-static void __init gpmc_mem_init(void)
+static __exit int gpmc_free_irq(void)
+{
+ int i;
+
+ if (gpmc_irq)
+ free_irq(gpmc_irq, NULL);
+
+ for (i = 0; i < GPMC_NR_IRQ; i++) {
+ irq_set_handler(gpmc_client_irq[i].irq, NULL);
+ irq_set_chip(gpmc_client_irq[i].irq, &no_irq_chip);
+ irq_modify_status(gpmc_client_irq[i].irq, 0, 0);
+ }
+
+ irq_free_descs(gpmc_irq_start, GPMC_NR_IRQ);
+
+ return 0;
+}
+
+static void __devexit gpmc_mem_exit(void)
+{
+ int cs;
+
+ for (cs = 0; cs < GPMC_CS_NUM; cs++) {
+ if (!gpmc_cs_mem_enabled(cs))
+ continue;
+ gpmc_cs_delete_mem(cs);
+ }
+
+}
+
+static void __devinit gpmc_mem_init(void)
{
int cs;
unsigned long boot_rom_space = 0;
@@ -879,64 +950,78 @@ static void __init gpmc_mem_init(void)
}
}
-static int __init gpmc_init(void)
+static __devinit int gpmc_probe(struct platform_device *pdev)
{
u32 l;
- int ret = -EINVAL;
- int gpmc_irq;
- char *ck = NULL;
-
- if (cpu_is_omap24xx()) {
- ck = "core_l3_ck";
- if (cpu_is_omap2420())
- l = OMAP2420_GPMC_BASE;
- else
- l = OMAP34XX_GPMC_BASE;
- gpmc_irq = INT_34XX_GPMC_IRQ;
- } else if (cpu_is_omap34xx()) {
- ck = "gpmc_fck";
- l = OMAP34XX_GPMC_BASE;
- gpmc_irq = INT_34XX_GPMC_IRQ;
- } else if (cpu_is_omap44xx()) {
- ck = "gpmc_ck";
- l = OMAP44XX_GPMC_BASE;
- gpmc_irq = OMAP44XX_IRQ_GPMC;
- }
+ struct resource *res;
+ struct gpmc_pdata *gp = dev_get_platdata(&pdev->dev);
- if (WARN_ON(!ck))
- return ret;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL)
+ return -ENOENT;
- gpmc_l3_clk = clk_get(NULL, ck);
- if (IS_ERR(gpmc_l3_clk)) {
- printk(KERN_ERR "Could not get GPMC clock %s\n", ck);
- BUG();
- }
+ phys_base = res->start;
+ mem_size = resource_size(res);
- gpmc_base = ioremap(l, SZ_4K);
- if (!gpmc_base) {
- clk_put(gpmc_l3_clk);
- printk(KERN_ERR "Could not get GPMC register memory\n");
- BUG();
- }
+ gpmc_base = devm_request_and_ioremap(&pdev->dev, res);
+ if (!gpmc_base)
+ return -EADDRNOTAVAIL;
+
+ gpmc_dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (res == NULL)
+ dev_warn(gpmc_dev, "Failed to get resource: irq\n");
+ else
+ gpmc_irq = res->start;
clk_enable(gpmc_l3_clk);
l = gpmc_read_reg(GPMC_REVISION);
- printk(KERN_INFO "GPMC revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
- /* Set smart idle mode and automatic L3 clock gating */
- l = gpmc_read_reg(GPMC_SYSCONFIG);
- l &= 0x03 << 3;
- l |= (0x02 << 3) | (1 << 0);
- gpmc_write_reg(GPMC_SYSCONFIG, l);
+ if (GPMC_REVISION_MAJOR(l) > 0x4)
+ gpmc_capability = GPMC_HAS_WR_ACCESS | GPMC_HAS_WR_DATA_MUX_BUS;
+ dev_info(gpmc_dev, "GPMC revision %d.%d\n",
+ GPMC_REVISION_MAJOR(l), GPMC_REVISION_MINOR(l));
+
gpmc_mem_init();
- ret = gpmc_setup_irq(gpmc_irq);
- if (ret)
- pr_err("gpmc: irq-%d could not claim: err %d\n",
- gpmc_irq, ret);
- return ret;
+ if (IS_ERR_VALUE(gpmc_setup_irq()))
+ dev_warn(gpmc_dev, "gpmc_setup_irq failed\n");
+
+ return 0;
}
+
+static __exit int gpmc_remove(struct platform_device *pdev)
+{
+ gpmc_free_irq();
+ gpmc_mem_exit();
+ gpmc_dev = NULL;
+ return 0;
+}
+
+static struct platform_driver gpmc_driver = {
+ .probe = gpmc_probe,
+ .remove = __devexit_p(gpmc_remove),
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static __init int gpmc_init(void)
+{
+ return platform_driver_register(&gpmc_driver);
+
+}
+
+static __exit void gpmc_exit(void)
+{
+ platform_driver_unregister(&gpmc_driver);
+
+}
+
postcore_initcall(gpmc_init);
+module_exit(gpmc_exit);
__init int omap_gpmc_init(struct gpmc_pdata *pdata)
{
--
1.7.10.2
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
