diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0549-pinctrl-bcm2835-Add-support-for-BCM2838.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0549-pinctrl-bcm2835-Add-support-for-BCM2838.patch | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0549-pinctrl-bcm2835-Add-support-for-BCM2838.patch b/target/linux/brcm2708/patches-4.19/950-0549-pinctrl-bcm2835-Add-support-for-BCM2838.patch new file mode 100644 index 0000000000..4b6a517585 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0549-pinctrl-bcm2835-Add-support-for-BCM2838.patch @@ -0,0 +1,90 @@ +From 841ee6798fcfd51ad6554e29bdc44e5687f66c7e Mon Sep 17 00:00:00 2001 +From: Tim Gover <tim.gover@raspberrypi.org> +Date: Wed, 9 Jan 2019 14:43:36 +0000 +Subject: [PATCH 549/782] pinctrl-bcm2835: Add support for BCM2838 + +GPIO configuration on BCM2838 is largely the same as BCM2835 except for +the pull up/down configuration. The old mechanism has been replaced +by new registers which don't require the fixed delay. + +Detect BCN2838 at run-time and use the new mechanism. Backwards +compatibility for the device-tree configuration has been retained. +--- + drivers/pinctrl/bcm/pinctrl-bcm2835.c | 58 ++++++++++++++++++++------- + 1 file changed, 44 insertions(+), 14 deletions(-) + +--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c ++++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c +@@ -67,6 +67,12 @@ + #define GPPUD 0x94 /* Pin Pull-up/down Enable */ + #define GPPUDCLK0 0x98 /* Pin Pull-up/down Enable Clock */ + ++/* 2711 has a different mechanism for pin pull-up/down/enable */ ++#define GPPUPPDN0 0xe4 /* Pin pull-up/down for pins 15:0 */ ++#define GPPUPPDN1 0xe8 /* Pin pull-up/down for pins 31:16 */ ++#define GPPUPPDN2 0xec /* Pin pull-up/down for pins 47:32 */ ++#define GPPUPPDN3 0xf0 /* Pin pull-up/down for pins 57:48 */ ++ + #define FSEL_REG(p) (GPFSEL0 + (((p) / 10) * 4)) + #define FSEL_SHIFT(p) (((p) % 10) * 3) + #define GPIO_REG_OFFSET(p) ((p) / 32) +@@ -917,21 +923,45 @@ static void bcm2835_pull_config_set(stru + unsigned int pin, unsigned int arg) + { + u32 off, bit; ++ /* BCM2835, BCM2836 & BCM2837 return 'gpio' for this unused register */ ++ int is_2835 = bcm2835_gpio_rd(pc, GPPUPPDN3) == 0x6770696f; + +- off = GPIO_REG_OFFSET(pin); +- bit = GPIO_REG_SHIFT(pin); +- +- bcm2835_gpio_wr(pc, GPPUD, arg & 3); +- /* +- * BCM2835 datasheet say to wait 150 cycles, but not of what. +- * But the VideoCore firmware delay for this operation +- * based nearly on the same amount of VPU cycles and this clock +- * runs at 250 MHz. +- */ +- udelay(1); +- bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit)); +- udelay(1); +- bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0); ++ if (is_2835) { ++ off = GPIO_REG_OFFSET(pin); ++ bit = GPIO_REG_SHIFT(pin); ++ /* ++ * BCM2835 datasheet say to wait 150 cycles, but not of what. ++ * But the VideoCore firmware delay for this operation ++ * based nearly on the same amount of VPU cycles and this clock ++ * runs at 250 MHz. ++ */ ++ bcm2835_gpio_wr(pc, GPPUD, arg & 3); ++ udelay(1); ++ bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit)); ++ udelay(1); ++ bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0); ++ } else { ++ u32 reg; ++ int lsb; ++ ++ off = (pin >> 4); ++ if (off > 3) ++ return; ++ lsb = (pin & 0xf) << 1; ++ ++ /* The up/down semantics are reversed compared to BCM2835. ++ * Instead of updating all the device tree files, translate the ++ * values here. ++ */ ++ if (arg == 2) ++ arg = 1; ++ else if (arg == 1) ++ arg = 2; ++ reg = bcm2835_gpio_rd(pc, GPPUPPDN0 + (off *4)); ++ reg &= ~(0x3 << lsb); ++ reg |= (arg & 3) << lsb; ++ bcm2835_gpio_wr(pc, GPPUPPDN0 + (off * 4), reg); ++ } + } + + static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev, |