diff options
Diffstat (limited to 'arch/powerpc/platforms/512x/mpc512x_shared.c')
-rw-r--r-- | arch/powerpc/platforms/512x/mpc512x_shared.c | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/512x/mpc512x_shared.c b/arch/powerpc/platforms/512x/mpc512x_shared.c index 707e572..e41ebbd 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> @@ -54,6 +58,286 @@ void mpc512x_restart(char *cmd) ; } +struct fsl_diu_shared_fb { + u8 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) +{ + switch (bits_per_pixel) { + case 32: + return 0x88883316; + case 24: + return 0x88082219; + case 16: + return 0x65053118; + } + return 0x00000400; +} + +void mpc512x_set_gamma_table(int monitor_port, char *gamma_table_base) +{ +} + +void mpc512x_set_monitor_port(int monitor_port) +{ +} + +#define DIU_DIV_MASK 0x000000ff +void mpc512x_set_pixel_clock(unsigned int pixclock) +{ + unsigned long bestval, bestfreq, speed, busfreq; + unsigned long minpixclock, maxpixclock, pixval; + struct mpc512x_ccm __iomem *ccm; + struct device_node *np; + 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); + of_node_put(np); + if (!ccm) { + pr_err("Can't map clock control module reg.\n"); + return; + } + + np = of_find_node_by_type(NULL, "cpu"); + if (np) { + const unsigned int *prop = + of_get_property(np, "bus-frequency", NULL); + + of_node_put(np); + if (prop) { + busfreq = *prop; + } else { + pr_err("Can't get bus-frequency property\n"); + return; + } + } else { + pr_err("Can't find 'cpu' node.\n"); + return; + } + + /* Pixel Clock configuration */ + pr_debug("DIU: Bus Frequency = %lu\n", busfreq); + speed = busfreq * 4; /* DIU_DIV ratio is 4 * CSB_CLK / DIU_CLK */ + + /* 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 = (1000000000 / pixclock) * 1000; + pixclock = temp; + pr_debug("DIU pixclock freq - %u\n", pixclock); + + temp = temp / 20; /* 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/pixclock; + pr_debug("DIU pixval = %lu\n", pixval); + + err = LONG_MAX; + bestval = pixval; + pr_debug("DIU bestval = %lu\n", bestval); + + bestfreq = 0; + for (i = -1; i <= 1; i++) { + temp = speed / (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->scfr1); + pr_debug("DIU: Current value of SCFR1: 0x%08x\n", temp); + temp &= ~DIU_DIV_MASK; + temp |= (bestval & DIU_DIV_MASK); + out_be32(&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 sprintf(buf, "0 - 5121 LCD\n"); +} + +int mpc512x_set_sysfs_monitor_port(int val) +{ + return 0; +} + +static struct fsl_diu_shared_fb __attribute__ ((__aligned__(8))) 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; + struct diu __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->diu_mode); + if (mode != MFB_MODE1) { + pr_info("%s: DIU OFF\n", __func__); + goto out; + } + + desc = in_be32(&diu_reg->desc[0]); + 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->disp_size); + 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->gamma); + 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->gamma, virt_to_phys(&diu_shared_fb.gamma)); + out_be32(&diu_reg->desc[1], 0); + out_be32(&diu_reg->desc[2], 0); + out_be32(&diu_reg->desc[0], virt_to_phys(&diu_shared_fb.ad0)); + +out: + iounmap(diu_reg); +} + +void __init mpc512x_setup_diu(void) +{ + int ret; + + /* + * We do not allocate and configure new area for bitmap buffer + * because it would requere copying bitmap data (splash image) + * and so negatively affect boot time. Instead we reserve the + * already configured frame buffer area so that it won't be + * destroyed. The starting address of the area to reserve and + * also it's length is passed to reserve_bootmem(). It will be + * freed later on first open of fbdev, when splash image is not + * needed any more. + */ + 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; |