[PATCH 3/3] powerpc/mpc5121: shared DIU framebuffer support
Grant Likely
grant.likely at secretlab.ca
Sun Feb 28 17:50:09 EST 2010
On Sat, Feb 27, 2010 at 2:58 PM, Anatolij Gustschin <agust at denx.de> wrote:
> MPC5121 DIU configuration/setup as initialized by the boot
> loader currently will get lost while booting Linux. As a
> result displaying the boot splash is not possible through
> the boot process.
>
> To prevent this we reserve configured DIU frame buffer
> address range while booting and preserve AOI descriptor
> and gamma table so that DIU continues displaying through
> the whole boot process. On first open from user space
> DIU frame buffer driver releases the reserved frame
> buffer area and continues to operate as usual.
>
> The patch also moves drivers/video/fsl-diu-fb.h file to
> include/linux as we use some DIU structures in platform
> code.
>
> 'diu_ops' callbacks in platform code borrowed from John's
> DIU code.
>
> Signed-off-by: John Rigby <jrigby at gmail.com>
> Signed-off-by: Anatolij Gustschin <agust at denx.de>
> Cc: Grant Likely <grant.likely at secretlab.ca>
On quick glance this patch seems mostly okay, but this patch should
probably be broken up a bit to simplify review and dissociate
unrelated changes. For example, the move of fsl-diu-fb.h is a
discrete change that should be split off. Some more comments
below....
> ---
> arch/powerpc/platforms/512x/mpc5121_ads.c | 7 +
> arch/powerpc/platforms/512x/mpc5121_generic.c | 13 ++
> arch/powerpc/platforms/512x/mpc512x.h | 3 +
> arch/powerpc/platforms/512x/mpc512x_shared.c | 282 +++++++++++++++++++++++++
> arch/powerpc/sysdev/fsl_soc.h | 1 +
> drivers/video/fsl-diu-fb.c | 25 ++-
> drivers/video/fsl-diu-fb.h | 223 -------------------
> include/linux/fsl-diu-fb.h | 223 +++++++++++++++++++
> 8 files changed, 549 insertions(+), 228 deletions(-)
> delete mode 100644 drivers/video/fsl-diu-fb.h
> create mode 100644 include/linux/fsl-diu-fb.h
>
> diff --git a/arch/powerpc/platforms/512x/mpc5121_ads.c b/arch/powerpc/platforms/512x/mpc5121_ads.c
> index ee6ae12..aa4d5a8 100644
> --- a/arch/powerpc/platforms/512x/mpc5121_ads.c
> +++ b/arch/powerpc/platforms/512x/mpc5121_ads.c
> @@ -42,6 +42,7 @@ static void __init mpc5121_ads_setup_arch(void)
> for_each_compatible_node(np, "pci", "fsl,mpc5121-pci")
> mpc83xx_add_bridge(np);
> #endif
> + mpc512x_setup_diu();
> }
>
> static void __init mpc5121_ads_init_IRQ(void)
> @@ -60,11 +61,17 @@ static int __init mpc5121_ads_probe(void)
> return of_flat_dt_is_compatible(root, "fsl,mpc5121ads");
> }
>
> +void __init mpc5121_ads_init_early(void)
> +{
> + mpc512x_init_diu();
> +}
> +
> define_machine(mpc5121_ads) {
> .name = "MPC5121 ADS",
> .probe = mpc5121_ads_probe,
> .setup_arch = mpc5121_ads_setup_arch,
> .init = mpc512x_init,
> + .init_early = mpc5121_ads_init_early,
> .init_IRQ = mpc5121_ads_init_IRQ,
> .get_irq = ipic_get_irq,
> .calibrate_decr = generic_calibrate_decr,
> diff --git a/arch/powerpc/platforms/512x/mpc5121_generic.c b/arch/powerpc/platforms/512x/mpc5121_generic.c
> index a6c0e3a..3aaa281 100644
> --- a/arch/powerpc/platforms/512x/mpc5121_generic.c
> +++ b/arch/powerpc/platforms/512x/mpc5121_generic.c
> @@ -28,6 +28,7 @@
> */
> static char *board[] __initdata = {
> "prt,prtlvt",
> + "ifm,pdm360ng",
You're adding a new board here. This is completely unrelated.
> NULL
> };
>
> @@ -48,10 +49,22 @@ static int __init mpc5121_generic_probe(void)
> return board[i] != NULL;
> }
>
> +void __init mpc512x_generic_init_early(void)
> +{
> + mpc512x_init_diu();
> +}
> +
> +void __init mpc512x_generic_setup_arch(void)
> +{
> + mpc512x_setup_diu();
> +}
> +
> define_machine(mpc5121_generic) {
> .name = "MPC5121 generic",
> .probe = mpc5121_generic_probe,
> .init = mpc512x_init,
> + .init_early = mpc512x_generic_init_early,
> + .setup_arch = mpc512x_generic_setup_arch,
> .init_IRQ = mpc512x_init_IRQ,
> .get_irq = ipic_get_irq,
> .calibrate_decr = generic_calibrate_decr,
> diff --git a/arch/powerpc/platforms/512x/mpc512x.h b/arch/powerpc/platforms/512x/mpc512x.h
> index d72b2c7..1cfe9d5 100644
> --- a/arch/powerpc/platforms/512x/mpc512x.h
> +++ b/arch/powerpc/platforms/512x/mpc512x.h
> @@ -17,4 +17,7 @@ extern int __init mpc5121_clk_init(void);
> void __init mpc512x_declare_of_platform_devices(void);
> extern void mpc512x_restart(char *cmd);
> extern void __init mpc5121_usb_init(void);
> +extern void __init mpc512x_init_diu(void);
> +extern void __init mpc512x_setup_diu(void);
__init annotations do not belong in header files.
> +extern struct fsl_diu_shared_fb diu_shared_fb;
Hmmmm. I'm not fond of the global data structure. Especially
considering that the struct fsl_diu_shared_fb is defined in
mpc512x_shared.c, so nothing outside of that .c file can do anything
with the structure.
> #endif /* __MPC512X_H__ */
> diff --git a/arch/powerpc/platforms/512x/mpc512x_shared.c b/arch/powerpc/platforms/512x/mpc512x_shared.c
> index fbdf65f..a8c50a6 100644
> --- a/arch/powerpc/platforms/512x/mpc512x_shared.c
> +++ b/arch/powerpc/platforms/512x/mpc512x_shared.c
> @@ -16,7 +16,11 @@
> #include <linux/io.h>
> #include <linux/irq.h>
> #include <linux/of_platform.h>
> +#include <linux/fsl-diu-fb.h>
> +#include <linux/bootmem.h>
> +#include <sysdev/fsl_soc.h>
>
> +#include <asm/cacheflush.h>
> #include <asm/machdep.h>
> #include <asm/ipic.h>
> #include <asm/prom.h>
> @@ -53,6 +57,284 @@ void mpc512x_restart(char *cmd)
> ;
> }
>
> +struct fsl_diu_shared_fb {
> + char gamma[0x300]; /* 32-bit aligned! */
> + struct diu_ad ad0; /* 32-bit aligned! */
> + phys_addr_t fb_phys;
> + size_t fb_len;
> + bool in_use;
> +};
> +
> +unsigned int mpc512x_get_pixel_format(unsigned int bits_per_pixel,
> + int monitor_port)
> +{
> + unsigned int pix_fmt;
> +
> + switch (bits_per_pixel) {
> + case 32:
> + pix_fmt = 0x88883316;
> + break;
> + case 24:
> + pix_fmt = 0x88082219;
> + break;
> + case 16:
> + pix_fmt = 0x65053118;
> + break;
> + default:
> + pix_fmt = 0x00000400;
> + }
> + return pix_fmt;
> +}
> +
> +void mpc512x_set_gamma_table(int monitor_port, char *gamma_table_base)
> +{
> +}
> +
> +void mpc512x_set_monitor_port(int monitor_port)
> +{
> +}
> +
> +#define CCM_SCFR1 0x0000000c
> +#define DIU_DIV_MASK 0x000000ff
> +void mpc512x_set_pixel_clock(unsigned int pixclock)
> +{
> + unsigned long bestval, bestfreq, speed_ccb, busfreq;
> + unsigned long minpixclock, maxpixclock, pixval;
> + struct device_node *np;
> + void __iomem *ccm;
> + u32 temp;
> + long err;
> + int i;
> +
> + np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-clock");
> + if (!np) {
> + pr_err("Can't find clock control module.\n");
> + return;
> + }
> +
> + ccm = of_iomap(np, 0);
> + if (!ccm) {
> + pr_err("Can't map clock control module reg.\n");
> + of_node_put(np);
> + return;
> + }
> + of_node_put(np);
> +
> + busfreq = 200000000;
Instead of some hard coding some bogus defalt busfreq, you should
error out if the real frequency cannot be determined. Force users to
supply a valid tree.
> + np = of_find_node_by_type(NULL, "cpu");
> + if (np) {
> + unsigned int size;
> + const unsigned int *prop =
> + of_get_property(np, "bus-frequency", &size);
> + if (prop)
> + busfreq = *prop;
> + of_node_put(np);
> + }
> +
> + /* Pixel Clock configuration */
> + pr_debug("DIU: Bus Frequency = %lu\n", busfreq);
> + speed_ccb = busfreq * 4;
> +
> + /* Calculate the pixel clock with the smallest error */
> + /* calculate the following in steps to avoid overflow */
> + pr_debug("DIU pixclock in ps - %d\n", pixclock);
> + temp = 1;
> + temp *= 1000000000;
> + temp /= pixclock;
> + temp *= 1000;
> + pixclock = temp;
Really? I think you can simplify this.
> + pr_debug("DIU pixclock freq - %u\n", pixclock);
> +
> + temp *= 5;
> + temp /= 100; /* pixclock * 0.05 */
> + pr_debug("deviation = %d\n", temp);
> + minpixclock = pixclock - temp;
> + maxpixclock = pixclock + temp;
> + pr_debug("DIU minpixclock - %lu\n", minpixclock);
> + pr_debug("DIU maxpixclock - %lu\n", maxpixclock);
> + pixval = speed_ccb/pixclock;
> + pr_debug("DIU pixval = %lu\n", pixval);
> +
> + err = 100000000;
> + bestval = pixval;
> + pr_debug("DIU bestval = %lu\n", bestval);
> +
> + bestfreq = 0;
> + for (i = -1; i <= 1; i++) {
> + temp = speed_ccb / (pixval+i);
> + pr_debug("DIU test pixval i=%d, pixval=%lu, temp freq. = %u\n",
> + i, pixval, temp);
> + if ((temp < minpixclock) || (temp > maxpixclock))
> + pr_debug("DIU exceeds monitor range (%lu to %lu)\n",
> + minpixclock, maxpixclock);
> + else if (abs(temp - pixclock) < err) {
> + pr_debug("Entered the else if block %d\n", i);
> + err = abs(temp - pixclock);
> + bestval = pixval + i;
> + bestfreq = temp;
> + }
> + }
> +
> + pr_debug("DIU chose = %lx\n", bestval);
> + pr_debug("DIU error = %ld\n NomPixClk ", err);
> + pr_debug("DIU: Best Freq = %lx\n", bestfreq);
> + /* Modify DIU_DIV in CCM SCFR1 */
> + temp = in_be32(ccm + CCM_SCFR1);
> + pr_debug("DIU: Current value of SCFR1: 0x%08x\n", temp);
> + temp &= ~DIU_DIV_MASK;
> + temp |= (bestval & DIU_DIV_MASK);
> + out_be32(ccm + CCM_SCFR1, temp);
> + pr_debug("DIU: Modified value of SCFR1: 0x%08x\n", temp);
> + iounmap(ccm);
> +}
> +
> +ssize_t mpc512x_show_monitor_port(int monitor_port, char *buf)
> +{
> + return snprintf(buf, PAGE_SIZE, "0 - 5121 LCD\n");
> +}
> +
> +int mpc512x_set_sysfs_monitor_port(int val)
> +{
> + return 0;
> +}
> +
> +struct fsl_diu_shared_fb __attribute__ ((__aligned__(8))) diu_shared_fb;
> +EXPORT_SYMBOL_GPL(diu_shared_fb);
> +
> +#if defined(CONFIG_FB_FSL_DIU) || \
> + defined(CONFIG_FB_FSL_DIU_MODULE)
> +static inline void mpc512x_free_bootmem(struct page *page)
> +{
> + __ClearPageReserved(page);
> + BUG_ON(PageTail(page));
> + BUG_ON(atomic_read(&page->_count) > 1);
> + atomic_set(&page->_count, 1);
> + __free_page(page);
> + totalram_pages++;
> +}
> +
> +void mpc512x_release_bootmem(void)
> +{
> + unsigned long addr = diu_shared_fb.fb_phys & PAGE_MASK;
> + unsigned long size = diu_shared_fb.fb_len;
> + unsigned long start, end;
> +
> + if (diu_shared_fb.in_use) {
> + start = PFN_UP(addr);
> + end = PFN_DOWN(addr + size);
> +
> + for (; start < end; start++)
> + mpc512x_free_bootmem(pfn_to_page(start));
> +
> + diu_shared_fb.in_use = false;
> + }
> + diu_ops.release_bootmem = NULL;
> +}
> +#endif
> +
> +/*
> + * Check if DIU was pre-initialized. If so, perform steps
> + * needed to continue displaying through the whole boot process.
> + * Move area descriptor and gamma table elsewhere, they are
> + * destroyed by bootmem allocator otherwise. The frame buffer
> + * address range will be reserved in setup_arch() after bootmem
> + * allocator is up.
> + */
> +void __init mpc512x_init_diu(void)
> +{
> + struct device_node *np;
> + void __iomem *diu_reg;
> + phys_addr_t desc;
> + void __iomem *vaddr;
> + unsigned long mode, pix_fmt, res, bpp;
> + unsigned long dst;
> +
> + np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-diu");
> + if (!np) {
> + pr_err("No DIU node\n");
> + return;
> + }
> +
> + diu_reg = of_iomap(np, 0);
> + of_node_put(np);
> + if (!diu_reg) {
> + pr_err("Can't map DIU\n");
> + return;
> + }
> +
> + mode = in_be32(diu_reg + 0x1c);
> + if (mode != 1) {
> + pr_info("%s: DIU OFF\n", __func__);
> + goto out;
> + }
> +
> + desc = in_be32(diu_reg);
> + vaddr = ioremap(desc, sizeof(struct diu_ad));
> + if (!vaddr) {
> + pr_err("Can't map DIU area desc.\n");
> + goto out;
> + }
> + memcpy(&diu_shared_fb.ad0, vaddr, sizeof(struct diu_ad));
> + /* flush fb area descriptor */
> + dst = (unsigned long)&diu_shared_fb.ad0;
> + flush_dcache_range(dst, dst + sizeof(struct diu_ad) - 1);
> +
> + res = in_be32(diu_reg + 0x28);
> + pix_fmt = in_le32(vaddr);
> + bpp = ((pix_fmt >> 16) & 0x3) + 1;
> + diu_shared_fb.fb_phys = in_le32(vaddr + 4);
> + diu_shared_fb.fb_len = ((res & 0xfff0000) >> 16) * (res & 0xfff) * bpp;
> + diu_shared_fb.in_use = true;
> + iounmap(vaddr);
> +
> + desc = in_be32(diu_reg + 0xc);
> + vaddr = ioremap(desc, sizeof(diu_shared_fb.gamma));
> + if (!vaddr) {
> + pr_err("Can't map DIU area desc.\n");
> + diu_shared_fb.in_use = false;
> + goto out;
> + }
> + memcpy(&diu_shared_fb.gamma, vaddr, sizeof(diu_shared_fb.gamma));
> + /* flush gamma table */
> + dst = (unsigned long)&diu_shared_fb.gamma;
> + flush_dcache_range(dst, dst + sizeof(diu_shared_fb.gamma) - 1);
> +
> + iounmap(vaddr);
> + out_be32(diu_reg + 0xc, virt_to_phys(&diu_shared_fb.gamma));
> + out_be32(diu_reg + 4, 0);
> + out_be32(diu_reg + 8, 0);
> + out_be32(diu_reg, virt_to_phys(&diu_shared_fb.ad0));
> +
> +out:
> + iounmap(diu_reg);
> +}
> +
> +void __init mpc512x_setup_diu(void)
> +{
> + int ret;
> +
> + if (diu_shared_fb.in_use) {
> + ret = reserve_bootmem(diu_shared_fb.fb_phys,
> + diu_shared_fb.fb_len,
> + BOOTMEM_EXCLUSIVE);
> + if (ret) {
> + pr_err("%s: reserve bootmem failed\n", __func__);
> + diu_shared_fb.in_use = false;
> + }
> + }
> +
> +#if defined(CONFIG_FB_FSL_DIU) || \
> + defined(CONFIG_FB_FSL_DIU_MODULE)
> + diu_ops.get_pixel_format = mpc512x_get_pixel_format;
> + diu_ops.set_gamma_table = mpc512x_set_gamma_table;
> + diu_ops.set_monitor_port = mpc512x_set_monitor_port;
> + diu_ops.set_pixel_clock = mpc512x_set_pixel_clock;
> + diu_ops.show_monitor_port = mpc512x_show_monitor_port;
> + diu_ops.set_sysfs_monitor_port = mpc512x_set_sysfs_monitor_port;
> + diu_ops.release_bootmem = mpc512x_release_bootmem;
> +#endif
> +}
> +
> void __init mpc512x_init_IRQ(void)
> {
> struct device_node *np;
> diff --git a/arch/powerpc/sysdev/fsl_soc.h b/arch/powerpc/sysdev/fsl_soc.h
> index 19754be..346057d 100644
> --- a/arch/powerpc/sysdev/fsl_soc.h
> +++ b/arch/powerpc/sysdev/fsl_soc.h
> @@ -30,6 +30,7 @@ struct platform_diu_data_ops {
> void (*set_pixel_clock) (unsigned int pixclock);
> ssize_t (*show_monitor_port) (int monitor_port, char *buf);
> int (*set_sysfs_monitor_port) (int val);
> + void (*release_bootmem) (void);
> };
>
> extern struct platform_diu_data_ops diu_ops;
> diff --git a/drivers/video/fsl-diu-fb.c b/drivers/video/fsl-diu-fb.c
> index 19ca1da..263f7da 100644
> --- a/drivers/video/fsl-diu-fb.c
> +++ b/drivers/video/fsl-diu-fb.c
> @@ -34,7 +34,7 @@
> #include <linux/of_platform.h>
>
> #include <sysdev/fsl_soc.h>
> -#include "fsl-diu-fb.h"
> +#include <linux/fsl-diu-fb.h>
>
> #include "ofmode.h"
>
> @@ -331,8 +331,11 @@ static int fsl_diu_enable_panel(struct fb_info *info)
> if (mfbi->type != MFB_TYPE_OFF) {
> switch (mfbi->index) {
> case 0: /* plane 0 */
> - if (hw->desc[0] != ad->paddr)
> + if (in_be32(&hw->desc[0]) != ad->paddr) {
Unrelated bugfix? If so, please split into separate patch.
> + out_be32(&dr.diu_reg->diu_mode, 0);
> out_be32(&hw->desc[0], ad->paddr);
This line also looks like it needs fixing.
> + out_be32(&dr.diu_reg->diu_mode, 1);
> + }
> break;
> case 1: /* plane 1 AOI 0 */
> cmfbi = machine_data->fsl_diu_info[2]->par;
> @@ -391,7 +394,7 @@ static int fsl_diu_disable_panel(struct fb_info *info)
>
> switch (mfbi->index) {
> case 0: /* plane 0 */
> - if (hw->desc[0] != machine_data->dummy_ad->paddr)
> + if (in_be32(&hw->desc[0]) != machine_data->dummy_ad->paddr)
Same bugfix?
> out_be32(&hw->desc[0],
> machine_data->dummy_ad->paddr);
> break;
> @@ -1102,6 +1105,10 @@ static int fsl_diu_open(struct fb_info *info, int user)
> struct mfb_info *mfbi = info->par;
> int res = 0;
>
> + /* free boot splash memory on first /dev/fb0 open */
> + if (!mfbi->index && diu_ops.release_bootmem)
> + diu_ops.release_bootmem();
> +
> spin_lock(&diu_lock);
> mfbi->count++;
> if (mfbi->count == 1) {
> @@ -1436,6 +1443,7 @@ static int __devinit fsl_diu_probe(struct of_device *ofdev,
> int ret, i, error = 0;
> struct resource res;
> struct fsl_diu_data *machine_data;
> + int diu_mode;
>
> machine_data = kzalloc(sizeof(struct fsl_diu_data), GFP_KERNEL);
> if (!machine_data)
> @@ -1472,7 +1480,9 @@ static int __devinit fsl_diu_probe(struct of_device *ofdev,
> goto error2;
> }
>
> - out_be32(&dr.diu_reg->diu_mode, 0); /* disable DIU anyway*/
> + diu_mode = in_be32(&dr.diu_reg->diu_mode);
> + if (diu_mode != MFB_MODE1)
> + out_be32(&dr.diu_reg->diu_mode, 0); /* disable DIU */
Is this the best approach? Would it be better to make this decision
based on a property in the device tree?
>
> /* Get the IRQ of the DIU */
> machine_data->irq = irq_of_parse_and_map(np, 0);
> @@ -1520,7 +1530,12 @@ static int __devinit fsl_diu_probe(struct of_device *ofdev,
> machine_data->dummy_ad->offset_xyd = 0;
> machine_data->dummy_ad->next_ad = 0;
>
> - out_be32(&dr.diu_reg->desc[0], machine_data->dummy_ad->paddr);
> + /* Let DIU display splash screen if it was pre-initialized
> + * by the bootloader, set dummy area descriptor otherwise.
> + */
> + if (diu_mode != MFB_MODE1)
> + out_be32(&dr.diu_reg->desc[0], machine_data->dummy_ad->paddr);
> +
Same as above.
> out_be32(&dr.diu_reg->desc[1], machine_data->dummy_ad->paddr);
> out_be32(&dr.diu_reg->desc[2], machine_data->dummy_ad->paddr);
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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